A magnetic auxiliary support structure and intelligent monitoring method for a stirring shaft

Abstract

The present application discloses a magnetic auxiliary support structure and intelligent monitoring method for a stirring shaft, wherein the magnetic auxiliary support structure comprises an inner magnetic part and an outer magnetic part; the inner magnetic part is fixedly mounted on the stirring shaft, and the outer magnetic part is sleeved on the outer side of the inner magnetic part and fixedly mounted; a magnetic repulsion is set between the inner magnetic part and the outer magnetic part, and the repulsion generated by the two is evenly distributed along the circumferential direction of the stirring shaft; the intelligent monitoring method adopts the above-mentioned magnetic auxiliary support structure, and calculates the actual deflection amount of the stirring shaft by monitoring the change of the motion field of the relative motion between the inner magnetic part and the outer magnetic part through a sensor. Beneficial effects of the present application: the magnetic repulsion between the inner magnetic part and the outer magnetic part can effectively reduce the bearing wear of the stirring shaft during the rotation process, and the use of magnetic force can ensure that the acquisition of relevant parameters during the movement of the stirring shaft reaches the sanitary level.

Description

Technical Field

[0001] The present application relates to the field of stirring technology, and in particular to a magnetic auxiliary support structure and an intelligent monitoring method for a stirring shaft. Background Art

[0002] In the traditional mixing process, the mixing shaft is generally installed in the tank body through the bearing, and then driven by the motor to rotate to mix the materials in the tank evenly. However, in the actual mixing process, due to the uneven initial state of the material, the mixing shaft is subjected to uneven force during the actual mixing process, which will aggravate the wear of the bearing in the long run and may even cause the mixing shaft to deform and bend.

[0003] At the same time, in order to ensure the working safety of the mixing shaft, it is often necessary to test the relevant parameters of the mixing system. As the mixing process has higher and higher requirements on the environment, it even needs to reach the sanitary level. The existing detection system may not meet the monitoring needs of the relevant parameters of the sanitary mixing operation. Summary of the invention

[0004] One of the objects of the present application is to provide a magnetic auxiliary support structure for a stirring shaft that can solve at least one defect in the above-mentioned background technology.

[0005] Another object of the present application is to provide an intelligent detection method for a stirring shaft that can solve at least one defect in the above-mentioned background technology.

[0006] In order to achieve at least one of the above-mentioned purposes, the technical solution adopted in the present application is: a magnetic auxiliary support structure of a stirring shaft, comprising an inner magnetic part and an outer magnetic part; the inner magnetic part is fixedly installed on the stirring shaft, and the outer magnetic part is sleeved on the outside of the inner magnetic part and fixedly installed; magnetic repulsion is set between the inner magnetic part and the outer magnetic part, and the repulsive force generated by the two is evenly distributed along the circumferential direction of the stirring shaft.

[0007] Preferably, the inner magnetic component and the outer magnetic component are spaced apart from each other.

[0008] Preferably, the inner magnetic component and the outer magnetic component are arranged in close contact with each other.

[0009] Preferably, the inner magnetic member and the outer magnetic member are both annular.

[0010] Preferably, the inner magnetic part is arc-shaped and a plurality of them are arranged at equal intervals along the circumferential direction, and the outer magnetic part is annular; or, the inner magnetic part is annular, and the outer magnetic part is arc-shaped and a plurality of them are arranged at equal intervals along the circumferential direction.

[0011] An intelligent detection method for a stirring shaft, using the above-mentioned magnetic auxiliary support structure, comprises the following steps:

[0012] S100: installing a sensor at a matching position of the inner magnetic part and the outer magnetic part;

[0013] S200: monitoring, by means of a sensor, a change in a motion field formed by relative motion between the inner magnetic part and the outer magnetic part during the rotation of the stirring shaft;

[0014] S300: Substituting the obtained motion field variation into a derivation formula to calculate the actual deflection of the stirring shaft;

[0015] S400: Determine the use status of the stirring shaft based on the comparison between the actual deflection amount obtained and the set threshold value.

[0016] Preferably, the sensor installed in step S100 is a magnetic sensor, which is used to monitor the change in magnetic field strength at the position of the magnetic sensor during the rotation of the stirring shaft; then the derivation formula used to calculate the actual runout amount d of the stirring shaft in step S300 is:

[0017] d=r-r0;

[0018] ;

[0019] Wherein, r0 represents the theoretical distance between the inner magnetic part and the magnetic sensor, r represents the actual distance between the inner magnetic part and the magnetic sensor, M0 represents the theoretical peak magnetic field strength of the inner magnetic part at the position of the magnetic sensor, and M represents the actual peak magnetic field strength of the inner magnetic part at the position of the magnetic sensor.

[0020] Preferably, the sensor installed in step S100 is a pressure sensor and is arranged on the external magnetic member, which is used to monitor the magnetic force change of the external magnetic member corresponding to the installation position of the pressure sensor during the rotation of the stirring shaft; then the derivation formula used to calculate the actual runout amount d of the stirring shaft in step S300 is:

[0021] d=r2-r1;

[0022] ;

[0023] ;

[0024] Where r1 represents the theoretical distance between the inner magnetic part and the outer magnetic part, r2 represents the actual distance between the inner magnetic part and the outer magnetic part, F1 represents the theoretical repulsion between the inner magnetic part and the outer magnetic part, F2 represents the actual repulsion between the inner magnetic part and the outer magnetic part monitored by the pressure sensor, μ0 represents the magnetic permeability in vacuum, M a represents the magnetic moment, V1 represents the volume of the inner magnetic part, and V2 represents the volume of the outer magnetic part.

[0025] Preferably, in step S100, the number of installed sensors is at least one, and multiple sensors are arranged at equal intervals along the circumferential direction of the stirring shaft; in step S200, when the change in the motion field monitored by the sensor is lower than 60% of the initial calibration value, it is determined that the residual magnetic flux of the inner magnetic part and the outer magnetic part is insufficient and needs to be replaced.

[0026] Preferably, in step S200, the rotation speed of the stirring shaft is acquired according to the magnetic pulses formed by the inner magnetic part and the outer magnetic part in the change of the motion field monitored by the sensor.

[0027] Compared with the prior art, the beneficial effects of this application are:

[0028] (1) The magnetic repulsion between the inner and outer magnetic parts ensures that the stirring shaft remains centered during rotation, which can effectively reduce the bearing wear of the stirring shaft during rotation, thereby increasing the service life and safety of the stirring shaft. In addition, the interaction between the inner and outer magnetic parts can achieve sanitary magnetic stirring.

[0029] (2) Based on the magnetic effect of the inner magnetic part and the outer magnetic part, the sensor can be used to monitor the changes in the motion field of the two to detect the use status of the stirring shaft. In addition, the acquisition of relevant parameters adopts the magnetic method, which can ensure that the acquisition of relevant parameters during the movement of the stirring shaft reaches the sanitary level. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure in which the inner magnetic part is installed on the rotating shaft in this application.

[0031] Figure 2 This is a schematic diagram of the structure in which the inner magnetic part is installed on the stabilizing ring in this application. Figure 1 .

[0032] Figure 3 This is a schematic diagram of the structure in which the inner magnetic part is installed on the stabilizing ring in this application. Figure 2 .

[0033] Figure 4 This is a schematic diagram of the structure in which the inner magnetic part and the outer magnetic part are spaced apart in the present application.

[0034] Figure 5 This is a schematic diagram of the structure in which the inner magnetic part and the outer magnetic part are fitted together in this application.

[0035] Figure 6 This is a schematic diagram of the structure in which the outer magnetic component of the present application adopts a segmented structure to cooperate with the inner magnetic component of the annular structure.

[0036] Figure 7Schematic diagram of the workflow of the intelligent monitoring method in this application.

[0037] Figure 8 This is a schematic diagram of the installation structure of the magnetic sensor in this application.

[0038] Fig. 9 This is a schematic diagram of the installation structure of the pressure sensor in this application.

[0039] Fig.10 Schematic diagram of the yaw fluctuation of the stirring shaft in this application.

[0040] In the figure: a stirring shaft 1, a rotating shaft 11, a stirring blade 12, a stabilizing ring 13, an inner magnetic part 21, an outer magnetic part 22, a supporting ring 23, a connecting rod 24, a magnetic sensor 31, and a pressure sensor 32. DETAILED DESCRIPTION

[0041] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0042] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present application.

[0043] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0044] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] The terms "including" and "having" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0047] One aspect of the present application provides a magnetic auxiliary support structure for a stirring shaft, such as Figures 1 to 6 As shown, one preferred embodiment includes an inner magnetic member 21 and an outer magnetic member 22. The inner magnetic member 21 is fixedly mounted on the stirring shaft 1, and the outer magnetic member 22 is sleeved on the outer side of the inner magnetic member 21 and fixedly mounted; the inner magnetic member 21 and the outer magnetic member 22 are magnetically repelled from each other, and the repulsive force generated by the two is evenly distributed along the circumferential direction of the stirring shaft 1.

[0048] It can be understood that the magnetic poles of the inner magnetic member 21 and the outer magnetic member 22 are the same, which can be the same N pole or the same S pole; thus, a repulsive magnetic field can be generated between the inner magnetic member 21 and the outer magnetic member 22 in the circumferential direction of the stirring shaft 1. Since the outer magnetic member 22 is fixedly arranged, its position can be regarded as unchanged, and the magnetic field between the inner magnetic member 21 and the outer magnetic member 22 will constrain the deflection of the stirring shaft 1 during the rotation of the stirring shaft 1, so that the stirring shaft 1 can maintain stable rotation in vertical alignment.

[0049] Specifically, when the use state of the stirring shaft 1 is abnormal, the inner magnetic part 21 will perform synchronous yaw motion with the stirring shaft 1, which will cause the distance between the inner magnetic part 21 and the outer magnetic part 22 to change. Analyzing a single yaw of the stirring shaft 1, a part of the inner magnetic part 21 will approach the outer magnetic part 22, and the area on the opposite side of the inner magnetic part 21 will move away from the outer magnetic part 22. For the area where the inner magnetic part 21 and the outer magnetic part 22 are close, the repulsive force between the two is intensified, so that the inner magnetic part 21 has a tendency to move away from the outer magnetic part 22 for resetting; while for the area where the inner magnetic part 21 and the outer magnetic part 22 are far away, the repulsive force between the two becomes weak, and the ability of the inner magnetic part 21 to resist resetting in the previous close area becomes weak. Through the combination of these two areas, it can be ensured that when the stirring shaft 1 yaws, the inner magnetic part 21 has a strong resetting ability, thereby ensuring that the stirring shaft 1 has good stability.

[0050] It should be known that the inner magnetic member 21 and the outer magnetic member 22 can cooperate to form a support assembly, and one or more support assemblies can be provided, and the specific arrangement can be made according to actual needs. For example, for a shorter stirring shaft 1, the deflection is better, and only a small number of support assemblies, such as one or two, are required. For a longer stirring shaft 1, the deflection is poor, and multiple support assemblies, such as two or three, are often required; the multiple support assemblies can be arranged at equal intervals along the length direction of the stirring shaft 1.

[0051] In this embodiment, based on the specific structure of the stirring shaft 1, the specific installation methods of the inner magnetic component 21 and the outer magnetic component 22 are different. For easy understanding, two specific examples will be used for detailed description below.

[0052] Example 1: Figure 1 As shown, the stirring shaft 1 includes a rotating shaft 11, which is rotatably mounted on the kettle body through a bearing, and the rotating shaft 11 can be connected to a driving source such as a motor to transmit power; the internal magnetic part 21 can be fixedly mounted on the rotating shaft 11. The specific installation method of the internal magnetic part 21 can be directly embedded, welded or bonded on the rotating shaft 11, or the internal magnetic part 21 can be embedded, welded or bonded on the mounting sleeve, and then the mounting sleeve is tightly sleeved on the rotating shaft 11.

[0053] For the installation of the external magnetic member 22, as Figures 4 to 6 As shown, a support ring 23 concentric with the installation axis of the stirring shaft 1 is installed on the outer side of the inner magnetic part 21, and the support ring 23 can be fixedly connected to the kettle body through the outer connecting rod 24. The outer magnetic part 22 can be fixedly installed on the inner side of the support ring 23 facing the inner magnetic part 21 by inlaying, welding or bonding.

[0054] Example 2: If Figure 2 and Figure 3 As shown, a stabilizing ring 13 is coaxially fixedly mounted on the stirring shaft 1, and the inner magnetic member 21 can be fixedly mounted on the outer side of the stabilizing ring 13 by direct embedding, welding or bonding. The specific installation method of the outer magnetic member 22 is similar to that of Example 1, so it will not be described in detail here.

[0055] It should be noted that, for large reactors, a stabilizing ring 13 is generally installed on the stirring shaft 1. The stabilizing ring 13 can balance the force during the rotation and stirring of the stirring shaft 1, and the force on all sides of the stabilizing ring 13 is uniform when rotating. During the rotation of the stirring shaft 1, a flow field will be generated in the reactor body. Once the center of rotation is offset, the flow field around the stabilizing ring 13 can generate a reaction force to pull the stirring shaft 1 back to the center position to suppress the deflection of the stirring shaft 1. That is, the stabilizing ring 13 can suppress the deflection of the stirring shaft 1, and the present embodiment adds a magnetic auxiliary support structure on the basis of the stabilizing ring 13, which can further improve the ability to suppress the deflection of the stirring shaft 1.

[0056] Specifically, the stirring shaft 1 includes a rotating shaft 11 and a stirring blade 12 mounted on the rotating shaft 11, and the stabilizing ring 13 can be fixedly mounted on the rotating shaft 11 or fixedly mounted on the stirring blade 12. Considering that the larger disturbance position of the stirring shaft 1 is located near the stirring blade 12, the stabilizing ring 13 can be preferably installed on the stirring blade 12. There are many specific connection methods between the stabilizing ring 13 and the stirring blade 12. For the sake of easy understanding, two specific methods will be described in detail below.

[0057] Connection method 1: Figure 2 As shown, the stabilizing ring 13 can be fixedly installed on the outside of the stirring blade 12. The specific installation method between the stabilizing ring 13 and the stirring blade 12 can be welding or plug-in, etc., which can be selected according to the actual needs of technical personnel in this field.

[0058] Connection method 2: Figure 3 As shown, the stabilizing ring 13 can be fixedly installed on the lower end of the stirring blade 12, and the specific installation method between the stabilizing ring 13 and the stirring blade 12 is preferably welding.

[0059] In this embodiment, based on the basic principle of magnetic assistance, such as Figure 4As shown, the inner magnetic part 21 and the outer magnetic part 22 can be spaced apart; the specific spacing distance is based on ensuring that the magnetic field between the two has sufficient auxiliary support capability for the stirring shaft 1, and the specific value of the spacing distance is mainly related to the magnetic field strength of the inner magnetic part 21 and the outer magnetic part 22. By setting the spacing between the inner magnetic part 21 and the outer magnetic part 22, it is possible to ensure contactless magnetic auxiliary support for the stirring shaft 1, thereby achieving the suppression of the deflection of the stirring shaft 1 while effectively improving the sanitary environment in the reactor to meet the sanitary requirements. Of course, as Figure 5 As shown, the inner magnetic member 21 and the outer magnetic member 22 can also be fitted together. Since the magnetic field between the two is a repulsive field, the contact force generated by the inner magnetic member 21 and the outer magnetic member 22 when fitting together is extremely small, that is, the friction force generated by the two during the relative rotation is extremely small. The fitting between the two can achieve the best effect of suppressing the deflection of the stirring shaft 1, and the extremely small friction between the two can basically meet the environmental requirements of the sanitary level.

[0060] In this embodiment, there are mainly two specific arrangements of the inner magnetic member 21 and the outer magnetic member 22 , which will be described in detail below through two specific examples.

[0061] Arrangement method 1: Figure 4 and Figure 5 As shown, the inner magnetic member 21 and the outer magnetic member 22 are both annular. In this way, when the inner magnetic member 21 rotates relative to the outer magnetic member 22, the inner magnetic member 21 and the outer magnetic member 22 generate mutual repulsive force at any position.

[0062] Arrangement method 2: Figure 6 As shown, the inner magnetic part 21 is arc-shaped and is arranged in multiple numbers at equal intervals along the circumferential direction, and the outer magnetic part 22 is annular. In this way, during the rotation of the inner magnetic part 21 relative to the outer magnetic part 22, any inner magnetic part 21 can generate a repulsive force that interacts with the outer magnetic part 22 at any position. Of course, the inner magnetic part 21 can also be arranged in an annular shape, and the outer magnetic part 22 can be arranged in an arc shape and be arranged in multiple numbers at equal intervals along the circumferential direction. In this way, during the rotation of the inner magnetic part 21 relative to the outer magnetic part 22, any outer magnetic part 22 can generate a repulsive force that interacts with the inner magnetic part 21 at any position.

[0063] It should be known that the inner magnetic part 21 and the outer magnetic part 22 can be an integral structure, or a component structure composed of multiple magnetic steels. That is, whether it is an annular inner magnetic part 21 and an outer magnetic part 22, or an arc-shaped inner magnetic part 21 and an outer magnetic part 22, they can be directly processed from a whole piece of magnetic steel. It is also possible to arrange multiple magnetic steels to form an annular or arc-shaped inner magnetic part 21 and an outer magnetic part 22 of corresponding structure. The specific structure of the inner magnetic part 21 and the outer magnetic part 22 can be selected according to the actual needs of technicians in this field.

[0064] Another aspect of the present application provides an intelligent detection method for a stirring shaft using the magnetic auxiliary support structure, such as Figure 7 As shown, one of the preferred embodiments includes the following steps:

[0065] S100: Installing a sensor at the matching position of the inner magnetic member 21 and the outer magnetic member 22 .

[0066] S200: Monitoring, by means of a sensor, a change in a motion field formed by the relative motion of the inner magnetic member 21 and the outer magnetic member 22 during the rotation of the stirring shaft 1.

[0067] S300: Substituting the obtained motion field variation into the derivation formula, the actual deflection of the stirring shaft 1 is calculated.

[0068] S400: Determine the use status of the stirring shaft 1 based on the comparison between the actual deflection amount obtained and the set threshold value.

[0069] It should be known that the stirring shaft 1 may have installation deviations and installation gaps during installation due to low assembly accuracy, which may cause the stirring shaft 1 to deflect during use. At the same time, the stirring shaft 1 may be subjected to structural bending and bearing transition wear due to long-term uneven loads during use, resulting in deflection and shaking. Although the aforementioned magnetic auxiliary support structure can suppress the deflection of the stirring shaft 1, it cannot eliminate the fact that the stirring shaft 1 is abnormal. In addition, for situations such as structural bending of the stirring shaft 1 and the deflection exceeding the suppression limit of the magnetic auxiliary support structure, the stirring shaft 1 needs to be replaced in time to avoid safety accidents. Therefore, during the movement of the stirring shaft 1, the movement state of the stirring shaft 1 needs to be monitored, and the monitoring equipment needs to be set inside the reactor; considering the environmental sanitation requirements of the reactor, the use status of the stirring shaft 1 can be monitored based on the movement state of the current magnetic auxiliary support structure, so that the monitoring can be achieved in a non-contact magnetic way, thereby ensuring that the stirring shaft 1 can achieve a sanitary magnetic stirring effect.

[0070] It is understandable that there are many types of motion fields that can be formed between the inner magnetic member 21 and the outer magnetic member 22, which can be a magnetic field with a changing magnetic field strength, or a magnetic field with a changing magnetic force, etc. For ease of understanding, the following will be described in detail using the change in magnetic field strength and the change in magnetic force as examples.

[0071] 1. Monitor the actual deflection of the stirring shaft 1 by using the change in magnetic field intensity.

[0072] like Figure 8 As shown, the sensor installed in step S100 is a magnetic sensor 31, which is used to monitor the change in magnetic field strength at the position of the magnetic sensor 31 during the rotation of the stirring shaft 1. The magnetic sensor 31 can be installed on the support ring 23 and is aimed at the internal magnetic part 21. The number of magnetic sensors 31 can be one or more. Multiple magnetic sensors 31 can be arranged at equal intervals along the circumferential direction of the support ring 23. The data monitored by multiple magnetic sensors 31 can be corrected with each other, and the average value can be taken at last. Then in step S300, the derivation formula for calculating the actual runout amount d of the stirring shaft 1 is:

[0073] d=r-r0; .

[0074] Among them, r0 represents the theoretical distance between the inner magnetic part 21 and the magnetic sensor 31, r represents the actual distance between the inner magnetic part 21 and the magnetic sensor 31, M0 represents the theoretical peak magnetic field strength of the inner magnetic part 21 at the position of the magnetic sensor 31, and M represents the actual peak magnetic field strength of the inner magnetic part 21 at the position of the magnetic sensor 31.

[0075] For ease of understanding, the specific formula derivation process may be described in detail below.

[0076] It should be known to those skilled in the art that the magnetic sensor 31 used to monitor the change in magnetic field strength generally adopts a Hall sensor. The relationship between magnetic field strength and distance can be described by the magnetic field formula of a magnetic dipole, namely the Biot-Savart formula. Taking the inner magnetic part 21 as an example of a magnetic steel, for a magnetic dipole, the relationship between its magnetic field strength H and distance R can be approximated as:

[0077] .

[0078] Among them, M r It represents the magnetic dipole moment. For a magnetic dipole, it can be considered as the product of the magnetization intensity and volume of the magnet. V represents the volume of the magnet, and μ0 represents the magnetic permeability in a vacuum.

[0079] In the initial state, that is, in the theoretical case where the stirring shaft 1 does not deflect, the theoretical magnetic field intensity peak value M0 of the inner magnetic member 21 at the position of the magnetic sensor 31 and the corresponding distance r0 can be expressed as:

[0080] .

[0081] Assuming that the stirring shaft 1 has a deflection, the peak value M0 of the magnetic field intensity of the inner magnetic part 21 will change to M according to the position change, that is, the actual peak value of the magnetic field intensity of the inner magnetic part 21 at the position of the magnetic sensor 31, and the corresponding actual distance is r. According to the above expression, the relationship between the actual magnetic field intensity peak M and the actual distance r can be obtained as follows:

[0082] .

[0083] Transforming the above two expressions can be obtained:

[0084] .

[0085] By further transforming the above formula, we can get the relationship between the actual distance r and the theoretical distance r0, and the difference between the two can be regarded as the actual deflection of the stirring shaft 1. Since the peak value M0 of the magnetic field intensity of the inner magnetic part 21 and the corresponding distance r0 can be regarded as known quantities, they can be obtained by theoretical calculation. Then, it is only necessary to monitor the actual magnetic field intensity of the inner magnetic part 21 during the rotation of the stirring shaft 1 through the magnetic sensor 31 to obtain the required actual magnetic field intensity peak value M; and then the corresponding actual distance r can be calculated through the above derivation formula.

[0086] Specifically, Fig.10 As shown, if the stirring shaft 1 deflects, then for the magnetic sensor 31, in one monitoring cycle, that is, during one rotation of the stirring shaft 1, the change curve of the magnetic field intensity monitored by the magnetic sensor 31 has two peak positions, namely the positive peak and the negative peak. When calculating the actual deflection amount, the positive peak value, the negative peak value, or the positive and negative peak values ​​can be used at the same time. After the actual deflection amount of the stirring shaft 1 is calculated, it can be compared with the set threshold value; if the actual deflection amount is greater than the set threshold value, the stirring shaft 1 needs to be replaced. The specific value of the threshold can be selected according to the actual needs of technicians in this field, for example, 0.5‰·L can be taken; wherein L represents the total length of the stirring shaft 1.

[0087] 2. The actual deflection of the stirring shaft 1 is monitored by using the change in magnetic force.

[0088] like Fig. 9As shown, the sensor installed in step S100 is a pressure sensor 32 and is arranged on the external magnetic part 22, which is used to monitor the magnetic force changes of the external magnetic part 22 corresponding to the installation position of the pressure sensor 32 during the rotation of the stirring shaft 1. In addition, in order to ensure the accuracy of the monitoring data of the pressure sensor 32, an arc-shaped segmented structure can be adopted for the external magnetic part 22, and the support ring 23 used to install the external magnetic part 22 also adopts an arc-shaped segmented structure. Each support ring segment is independent of each other and is fixedly connected to the kettle body through the corresponding connecting rod 24. The pressure sensor 32 can be arranged between the connecting rod 24 and the support ring segment, or between the external magnetic part 22 and the support ring segment. The number of pressure sensors 32 can be one or more. Then the derivation formula used to calculate the actual runout amount d of the stirring shaft 1 in step S300 is:

[0089] d=r2-r1; ; .

[0090] Wherein, r1 represents the theoretical distance between the inner magnetic member 21 and the outer magnetic member 22, r2 represents the actual distance between the inner magnetic member 21 and the outer magnetic member 22, F1 represents the theoretical repulsion between the inner magnetic member 21 and the outer magnetic member 22, F2 represents the actual repulsion between the inner magnetic member 21 and the outer magnetic member 22 monitored by the pressure sensor 32, μ0 represents the magnetic permeability in vacuum, M a represents the magnetic moment, V1 represents the volume of the inner magnetic member 21 , and V2 represents the volume of the outer magnetic member 22 .

[0091] For ease of understanding, the specific formula derivation process may be described in detail below.

[0092] The repulsive force between the inner magnetic member 21 and the outer magnetic member 22 can be expressed by the calculation formula of the repulsive force F between magnetic dipoles. The specific calculation formula is as follows:

[0093] .

[0094] Wherein, μ0 represents the magnetic permeability in vacuum, M1 and M2 represent the magnetic moments of the inner magnetic member 21 and the outer magnetic member 22, respectively. The magnetic moment can be measured by the magnetic moment quantity M a Assuming that the magnetic moments of the inner magnetic member 21 and the outer magnetic member 22 are the same in this example, the magnetic moment M1 of the inner magnetic member 21 is M2 = M a ×V1, the magnetic moment M2 of the external magnetic member 22 = M a ×V2. Substituting the expressions of M1 and M2 into the above calculation formula of repulsive force F, we can get:

[0095] .

[0096] By transforming the above formula, we can get:

[0097] .

[0098] Based on the above calculation formula, we can get the relationship between the repulsive force F1 and the corresponding distance r1 in the theoretical case, and the relationship between the repulsive force F2 and the corresponding distance r2 in the actual case. a The volumes V1 and V2 of the inner magnetic part 21 and the outer magnetic part 22 and the theoretical repulsion F1 are known quantities, and the theoretical distance r1 between the inner magnetic part 21 and the outer magnetic part 22 under theoretical conditions can be calculated. Then, after the actual repulsion F2 between the inner magnetic part 21 and the outer magnetic part 22 is measured by the pressure sensor 32, the actual distance r2 between the inner magnetic part 21 and the outer magnetic part 22 can be calculated by the above formula; and then the actual deflection amount of the stirring shaft 1 can be obtained by calculating the difference between the actual distance and the theoretical distance.

[0099] In this embodiment, the sensor can not only monitor the use status of the stirring shaft 1, but also monitor the residual magnetic flux of the inner magnetic part 21 and the outer magnetic part 22. It can be understood that the magnetic flux of the inner magnetic part 21 and the outer magnetic part 22 will continue to decrease with the increase of the use time, which will cause the magnetic auxiliary support capacity formed between the inner magnetic part 21 and the outer magnetic part 22 to weaken; when it drops to a certain limit, the inner magnetic part 21 and the outer magnetic part 22 need to be replaced. The specific replacement standard can be set according to the actual needs of technical personnel in this field. For example, in step S200, when the change in the motion field monitored by the sensor is lower than 60% of the initial calibration value, it is determined that the residual magnetic flux of the inner magnetic part 21 and the outer magnetic part 22 is insufficient and needs to be replaced.

[0100] Specifically, taking the magnetic sensor 31 as an example, when the average magnetic field strength of the inner magnetic member 21 at the position of the magnetic sensor 31 decreases from the calibration value to 60% of the calibration value, it can be determined that the residual magnetic flux of the inner magnetic member 21 and the outer magnetic member 22 is insufficient. Taking the pressure sensor 32 as an example, when the average repulsive force between the inner magnetic member 21 and the outer magnetic member 22 decreases from the calibration value to 60% of the calibration value, it can be determined that the residual magnetic flux of the inner magnetic member 21 and the outer magnetic member 22 is insufficient. The calibration value is the magnetic field strength value or repulsive force value calculated under theoretical conditions.

[0101] It should be known that the residual magnetic flux of the inner magnetic member 21 and the outer magnetic member 22 can be determined when the stirring shaft 1 is rotating or when the stirring shaft 1 is stationary. For the determination in the stationary state, it is only necessary to average the monitoring data of multiple sensors and compare them with the calibration value.

[0102] In this embodiment, Fig.10 It can be seen that in one monitoring cycle of the pressure sensor, the deflection of the stirring shaft 1 will cause a positive peak value to be generated in the monitoring curve, and the positive peak position corresponds to a magnetic pulse formed between the inner magnetic part 21 and the outer magnetic part 22. Then, during the rotation of the stirring shaft 1, the rotation speed of the stirring shaft 1 can be obtained by recording the frequency of the magnetic pulse, so that there is no need to set up additional rotation speed monitoring equipment to monitor the stirring shaft 1, which can effectively reduce costs.

[0103] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. An intelligent detection method for a stirring shaft, using a magnetic auxiliary support structure, the magnetic auxiliary support structure comprising an inner magnetic part and an outer magnetic part; the inner magnetic part is fixedly installed on the stirring shaft, and the outer magnetic part is sleeved on the outer side of the inner magnetic part and fixedly installed; the inner magnetic part and the outer magnetic part are magnetically repelled from each other, and the repulsive force generated by the two is uniformly distributed along the circumferential direction of the stirring shaft; characterized in that, The steps include: S100: installing a sensor at a matching position of the inner magnetic part and the outer magnetic part; S200: monitoring, by means of a sensor, a change in a motion field formed by relative motion between the inner magnetic part and the outer magnetic part during the rotation of the stirring shaft; S300: Substituting the obtained motion field variation into a derivation formula to calculate the actual deflection of the stirring shaft; S400: judging the use status of the stirring shaft according to the comparison between the actual deflection amount obtained and the set threshold value; The sensor installed in step S100 is a magnetic sensor, which is used to monitor the change in magnetic field strength at the position of the magnetic sensor during the rotation of the stirring shaft; the derivation formula used to calculate the actual runout amount d of the stirring shaft in step S300 is: d=r-r0； ； Wherein, r0 represents the theoretical distance between the inner magnetic part and the magnetic sensor, r represents the actual distance between the inner magnetic part and the magnetic sensor, M0 represents the theoretical peak value of the magnetic field intensity of the inner magnetic part at the position of the magnetic sensor, and M represents the actual peak value of the magnetic field intensity of the inner magnetic part at the position of the magnetic sensor; Alternatively, the sensor installed in step S100 is a pressure sensor and is arranged on the external magnetic part, which is used to monitor the magnetic force change of the external magnetic part corresponding to the installation position of the pressure sensor during the rotation of the stirring shaft; then the derivation formula used to calculate the actual runout amount d of the stirring shaft in step S300 is: d=r2-r1； ； ； Where r1 represents the theoretical distance between the inner magnetic part and the outer magnetic part, r2 represents the actual distance between the inner magnetic part and the outer magnetic part, F1 represents the theoretical repulsion between the inner magnetic part and the outer magnetic part, F2 represents the actual repulsion between the inner magnetic part and the outer magnetic part monitored by the pressure sensor, μ0 represents the magnetic permeability in vacuum, M a represents the magnetic moment, V1 represents the volume of the inner magnetic part, and V2 represents the volume of the outer magnetic part.

2. The intelligent detection method for a stirring shaft according to claim 1, characterized in that: The inner magnetic component and the outer magnetic component are spaced apart from each other.

3. The intelligent detection method for a stirring shaft according to claim 1, characterized in that: The inner magnetic component and the outer magnetic component are arranged in close contact with each other.

4. The intelligent detection method for a stirring shaft according to any one of claims 1 to 3, characterized in that: The inner magnetic component and the outer magnetic component are both ring-shaped.

5. The intelligent detection method for a stirring shaft according to any one of claims 1 to 3, characterized in that: The inner magnetic member is arc-shaped and is arranged in multiple numbers at equal intervals along the circumferential direction, and the outer magnetic member is annular; Alternatively, the inner magnetic component is annular, and the outer magnetic component is arc-shaped and a plurality of the outer magnetic components are arranged at equal intervals along the circumferential direction.

6. The intelligent detection method for a stirring shaft according to claim 1, characterized in that: In step S100, the number of installed sensors is at least one, and the multiple sensors are arranged at equal intervals along the circumferential direction of the stirring shaft; In step S200, when the change in the motion field detected by the sensor is lower than 60% of the initial calibration value, it is determined that the residual magnetic flux of the inner magnetic part and the outer magnetic part is insufficient and needs to be replaced.

7. The intelligent detection method for a stirring shaft according to claim 1, characterized in that: In step S200, the rotation speed of the stirring shaft is acquired according to the magnetic pulses formed by the inner magnetic part and the outer magnetic part in the change of the motion field monitored by the sensor.

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