Belt fracture detection device and detection method and planetary stirring equipment

Abstract

The invention relates to a belt breakage detection device and method and planetary stirring equipment, and belongs to the technical field of transmission monitoring of mechanical equipment. A speed measuring coded disc is arranged at the top of a revolution main shaft of the planetary stirring equipment, and induction magnetic discs are respectively arranged at the tops of two rotation main shafts; meanwhile, a Hall sensor fixed on a rack is used for detecting magnetic disk signals passing along with revolution of a main shaft, and revolution periods are counted in a segmented mode in cooperation with coded disc pulses. The problem that when the device is applied to belt detection of planetary stirring equipment, wiring of moving parts cannot be directly achieved is solved, and belt breakage detection under the multi-rotating-speed working condition is achieved.

Description

Technical Field

[0001] This invention relates to the field of mechanical equipment transmission monitoring technology, and in particular to a belt breakage detection device, detection method, and planetary mixing equipment. Background Technology

[0002] With the development of mechanical equipment transmission monitoring technology, there is a growing demand for real-time monitoring of belt drive status. Due to its simple structure, stable operation, and suitability for long-distance transmission, belt drives are widely used in various types of mechanical equipment. However, for aesthetic reasons, belts are often designed to be concealed, making it impossible for operators to directly observe their operating status. Typically, by the time equipment malfunctions, stops, or fails to operate normally, the belt has already broken, resulting in significant monitoring blind spots and delayed maintenance.

[0003] In related technologies, such as the patent with publication number CN217675154U, a belt condition monitoring device based on a magnetic switch is proposed. By installing a magnet on the transmission wheel and using a magnetic switch to sense the magnet, the magnet periodically approaches the switch to generate an on / off signal, thereby determining whether the belt is running normally and triggering an audible and visual alarm device to indicate abnormalities.

[0004] However, the above solution has the following problems in practical applications: Its judgment logic is relatively simple, and it can only detect based on a fixed on / off frequency, making it difficult to adapt to complex working conditions that require frequent switching of speed or variable speed operation. Meanwhile, this solution uses the tensioner as the motion sensing point, but the tensioner is usually a passive pulley. When the belt becomes loose, the tensioner may stop moving, thus failing to accurately reflect the true operating state of the belt. Furthermore, this structure is not suitable for stirring equipment with planetary revolution mechanisms, nor is it compatible with monitoring requirements in multi-degree-of-freedom motion scenarios, thus limiting its applicability. Summary of the Invention

[0005] In response to the shortcomings of the existing production technology, the applicant provides a belt breakage detection device, detection method, and planetary mixing equipment, thereby solving the problem that mixing equipment with planetary revolution structure cannot be directly fixed-point detected. Even under different speed combinations, it can ensure effective function and high reliability of detection results.

[0006] The technical solution adopted in this invention is as follows: A belt breakage detection device is used in a planetary mixing device. The planetary mixing device includes a revolution gearbox, and a first dispersion main shaft, a second dispersion main shaft, and a central main shaft disposed within the revolution gearbox. The central main shaft serves as the revolution axis, and the first and second dispersion main shafts serve as rotation axes. Dispersion synchronous pulleys are provided on both the first and second dispersion main shafts, and a central synchronous pulley is provided on the central main shaft. The central synchronous pulley and the dispersion synchronous pulleys are connected by a synchronous belt drive. The belt breakage detection device includes: The first sensing disk is disposed on top of the first dispersive spindle; The second sensing disk is positioned on top of the second dispersive spindle; A Hall sensor is fixedly mounted on the orbital gearbox and located above the position through which the first or second dispersive spindle passes during its orbital rotation. It is used to generate a sensing signal when the first or second sensing disk revolves and passes by the spindle it is on.

[0007] As a further improvement to the above technical solution: In one embodiment, the first sensing disk and the second sensing disk have the same structure, both including: Mounting plate, used for fixed connection to the top of the corresponding dispersive spindle; A strong magnet is mounted on the mounting plate; A pressure plate is pressed onto the strong magnet and connected to the mounting plate via fasteners to fix the strong magnet on the mounting plate.

[0008] In one embodiment, a revolution speed measuring component is also included, the revolution speed measuring component comprising: The speed measuring encoder is coaxially mounted on the top of the central main shaft and revolves together with the central main shaft; A slotted photoelectric sensor is fixedly installed and works in conjunction with the speed measuring code disk to generate a corresponding number of pulse signals based on the number of teeth on the speed measuring code disk during each revolution cycle.

[0009] In one embodiment, a revolution-to-stop component is also included, the revolution-to-stop component comprising: A fixed-point sample stop block is set on the central main shaft; A fixed-point stop proximity switch is fixedly installed and cooperates with the fixed-point stop sample block to generate a fixed-point stop signal every time the central spindle revolves once.

[0010] In one embodiment, the number of Hall sensors is one, and it is located at the same radial position on the orbital paths of the first and second dispersive spindles, so as to generate sensing signals when the first and second sensing disks pass by.

[0011] On the other hand, this application also provides a detection method using the above-mentioned belt breakage detection device, comprising the following steps: Obtain the orbital period signal; One orbital period is divided into a first time period, a second time period, a third time period, and a fourth time period; During the first time period, record the number A of the first signals A generated by the Hall sensor detected by the first sensing disk; During the second time period, it is determined whether the number of the first signals A is greater than the first preset threshold. If not, the first pre-alarm value is accumulated. During the third time period, the number B of second signals B generated by the second sensing disk detected by the Hall sensor is recorded; During the fourth time period, it is determined whether the number of the second signal B is greater than the second preset threshold. If not, the second pre-alarm value is accumulated.

[0012] In one embodiment, the step of dividing one orbital period into a first time period, a second time period, a third time period, and a fourth time period specifically includes: Based on the total number of pulses generated by the orbital speed measuring component within one orbital cycle, the total number of pulses is divided into four equal parts, and the duration of each part is taken as a time period.

[0013] In one embodiment, the detection method further includes: calculating the ratio of the first signal quantity A to the second signal quantity B during the fourth time period; Determine whether the ratio is within the preset ratio range. If not, accumulate the third pre-alarm value.

[0014] In one embodiment, the detection method further includes: summing the first pre-alarm value and the second pre-alarm value accumulated within a preset number of consecutive revolution cycles; Determine whether the sum is greater than a third preset threshold. If so, output a band break alarm signal.

[0015] On the other hand, a planetary mixing device is also provided, including the aforementioned belt breakage detection device.

[0016] The beneficial effects of this invention are as follows: This invention features a compact structure and solves the problem of fixed-point detection in planetary mixing equipment. Specifically, related technologies typically rely on installing magnets on wheels at fixed positions. However, the main shaft of a planetary mixing equipment both rotates on its own axis and revolves around a central axis, making it impossible to directly wire or install sensors at fixed points. This application installs a sensing disk on top of a distributed main shaft that revolves with the main shaft, and fixes a Hall sensor above its orbital trajectory. This "moving disk, fixed sensor" layout cleverly avoids the problem of wire entanglement, thereby enabling real-time monitoring of belt status in complex moving structures.

[0017] This invention also has the following advantages: This invention can adapt to complex operating conditions with frequent speed changes, and the detection logic is more intelligent. Specifically, related technologies only make judgments based on a fixed on / off frequency, which is prone to false alarms under variable speed conditions. However, this application introduces a revolution speed measuring component, which accurately obtains the revolution cycle through a speed measuring code disk and a slotted photoelectric sensor, and divides one revolution cycle into several time periods. By collecting the number of signals sensed by the Hall sensor in each time period and comparing them with an adjustable preset value, the algorithm can dynamically adapt to changes in the spindle speed, thus accurately determining whether the belt is broken even during variable speed operation.

[0018] This invention eliminates detection blind spots caused by synchronous wear or loosening of belts through a ratio judgment mechanism. In related technologies, if two belts loosen simultaneously, the rotation speed of the main shaft will slow down synchronously. Although the number of signals detected by the Hall sensor decreases, the ratio between them may not change significantly. This application introduces ratio analysis of the number of signals from the two sensing disks. By judging whether the ratio of A to B is within a preset range, it can effectively identify special working conditions where the two belts age or slip synchronously, further improving the reliability and sensitivity of the detection.

[0019] This invention employs a multi-cycle cumulative early warning mechanism, effectively avoiding false alarms caused by momentary interference. Specifically, this application does not immediately trigger an alarm upon detecting a single anomaly. Instead, it accumulates the number of pre-alarms over the most recent orbital cycles. Only when the total accumulated early warning values ​​exceed a preset threshold is a formal band break alarm output. Therefore, this application can filter out false alarms caused by momentary vibration, electromagnetic interference, or accidental signal loss, ensuring the accuracy of the alarm and the stable operation of the equipment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the orbital speed measuring component of the present invention.

[0022] Figure 3 for Figure 2 A schematic diagram of the specific structure of the speed measuring encoder.

[0023] Figure 4 This is a schematic diagram of the orbital stop component of the present invention.

[0024] Figure 5 This is a schematic diagram of the structure of the band breakage detection component of the present invention.

[0025] Figure 6 This is a three-dimensional structural diagram of the inductive disk of the present invention.

[0026] Figure 7 for Figure 6 A schematic diagram of the structure under explosive conditions.

[0027] Figure 8 This is a schematic diagram showing the start and end positions of the present invention in time period 1.

[0028] Figure 9 This is a schematic diagram showing the start and end positions of the present invention in time period 2.

[0029] Figure 10 This is a schematic diagram showing the start and end positions of the present invention in time period 3.

[0030] Figure 11 This is a schematic diagram showing the start and end positions of the present invention in time period 4.

[0031] Figure 12 This is a schematic diagram of the band breakage detection process of the present invention.

[0032] Among them: 100, first dispersing main shaft; 200, synchronous belt; 300, dispersing synchronous belt pulley; 400, revolution gearbox; 500, revolution speed measuring component; 600, revolution fixed-point stop component; 700, belt breakage detection component; 800, central main shaft; 900, central synchronous belt pulley; 1000, second dispersing main shaft; 510. Speed ​​measuring encoder; 520. Slotted photoelectric sensor; 610. Fixed-point stopping sample block; 620. Fixed-point stopping proximity switch; 710. First sensing disk; 720. Hall sensor; 730. Second sensing disk; 711. Mounting plate; 712. Strong magnet; 713. Pressure plate; 714. Fastener. Detailed Implementation

[0033] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0034] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly 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 or an electrical connection; 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 explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0038] See Figure 1 The planetary mixing device protected in the embodiments of the present invention mainly includes a planetary gearbox 400 in its core transmission part. The planetary gearbox 400 is internally equipped with a first distributing main shaft 100, a second distributing main shaft 1000, and a central main shaft 800. The central main shaft 800 serves as the revolution axis, while the first and second distributing main shafts 100 and 1000 serve as rotation axes. They are evenly distributed around the central main shaft 800 and revolve together with it. During operation, power is input through the central main shaft 800 to drive the entire planetary mechanism. Furthermore, in order to realize the conversion of revolution motion to rotation motion, two central synchronous pulleys 900 are fixedly sleeved on the central main shaft 800, and distributed synchronous pulleys 300 are fixedly sleeved on the first distributed main shaft 100 and the second distributed main shaft 1000 respectively.

[0039] Specifically, one of the central synchronous pulleys 900 is connected to the distributed synchronous pulley 300 on the first distributed main shaft 100 via a synchronous belt 200; the other central synchronous pulley 900 is connected to the distributed synchronous pulley 300 on the second distributed main shaft 1000 via another synchronous belt 200. When the central spindle 800 rotates, the first and second dispersive spindles 100 and 1000 will rotate on their own axes while revolving around the sun, driven by the synchronous belt 200.

[0040] like Figures 1 to 7 As shown, the present invention provides a belt breakage detection device, which mainly includes a belt breakage detection component 700, a revolution speed measuring component 500, and a revolution fixed-point stop component 600, for real-time monitoring of the operating status of the aforementioned synchronous belt 200.

[0041] Specifically, the belt breakage detection component 700 is used to directly sense the rotation state of the dispersive spindle; refer to Figure 1 , Figure 5 , Figure 6 and Figure 7 The tape breakage detection component 700 includes a first sensing disk 710, a second sensing disk 730, and a Hall sensor 720; The first sensing disk 710 is fixedly installed on the top of the first dispersing spindle 100, the second sensing disk 730 is fixedly installed on the top of the second dispersing spindle 1000, and the Hall sensor 720 is fixedly installed on the top frame of the orbital gearbox 400. Its installation position is directly above the orbital path of the first dispersing spindle 100 or the second dispersing spindle 1000 (the two orbital trajectories coincide).

[0042] In this embodiment, the Hall sensor 720 is preferably one, with its sensing head facing the orbital trajectory of the lower dispersive spindle. Thus, when the first dispersive spindle 100, carrying the first sensing disk 710, revolves past this position, the Hall sensor 720 can sense the magnetic field of the first sensing disk 710 and generate a pulse signal. Similarly, when the second dispersive spindle 1000, carrying the second sensing disk 730, revolves past the same position, the Hall sensor 720 will also generate a pulse signal.

[0043] like Figure 6 and Figure 7 As shown, the first sensing disk 710 and the second sensing disk 730 have identical structures. Taking the first sensing disk 710 as an example, its specific structure includes a mounting plate 711, a strong magnet 712, and a pressure plate 713; the bottom of the mounting plate 711 is used to fix it to the top of the first dispersive spindle 100. The strong magnet 712 is placed on the mounting plate 711; the pressure plate 713 is pressed on the top of the strong magnet 712 and is fixedly connected to the mounting plate 711 by fasteners 714, thereby firmly clamping and fixing the strong magnet 712 between the mounting plate 711 and the pressure plate 713. This stacked structure ensures that the strong magnet 712 will not loosen under complex motion conditions of high-speed rotation and revolution, thus guaranteeing the reliability of the signal source.

[0044] In this embodiment, the revolution speed measuring component 500 is used to measure the revolution speed and period of the central spindle 800; Reference Figure 1 and Figure 2 The orbital speed measuring component 500 includes a speed measuring code disk 510 and a slotted photoelectric sensor 520; the speed measuring code disk 510 is coaxially fixedly installed on the top of the central spindle 800 and revolves together with the central spindle 800. Furthermore, multiple teeth (such as...) are evenly distributed on the outer circumference of the speed measuring encoder 510. Figure 3 (As shown). The slotted photoelectric sensor 520 is fixedly mounted on the top frame of the orbital gearbox 400, with its transmitter and receiver located on the radial sides of the speed measuring code disk 510, respectively; As the speed encoder 510 rotates with the central spindle 800, its teeth pass sequentially through the slot of the slotted photoelectric sensor 520. Each time it passes through a tooth, it blocks the light, causing the slotted photoelectric sensor 520 to generate a pulse signal. Therefore, when the central spindle 800 completes one revolution cycle, the slotted photoelectric sensor 520 will generate the same number of pulse signals as the number of teeth on the encoder.

[0045] In this embodiment, the orbital stop component 600 is used to provide a reference point for the start of the orbital cycle for the entire detection process.

[0046] Reference Figure 1 and Figure 4 The orbital fixed-point stop component 600 includes a fixed-point stop sample block 610 and a fixed-point stop proximity switch 620; The fixed-point stop block 610 is fixedly installed on the central spindle 800. The fixed-point stop proximity switch 620 is fixedly installed on the top frame of the revolution gearbox 400, with its sensing end facing the revolution trajectory of the fixed-point stop block 610. When the central spindle 800 revolves once, the fixed-point stop block 610 will approach the fixed-point stop proximity switch 620 once, triggering it to generate a fixed-point stop signal; the time interval between two adjacent fixed-point stop signals is a complete revolution cycle.

[0047] The signals from all the above sensors (Hall sensor 720, slotted photoelectric sensor 520, and fixed-point stop proximity switch 620) are sent to the programmable logic controller (PLC) of the equipment for processing and logical judgment.

[0048] The following combination Figures 8 to 12 The working principle and process of the belt breakage detection method used in this invention are explained below: First, the system uses the signal generated by the fixed-point stop proximity switch 620 as the starting point of each revolution cycle. For example... Figure 12 As shown, after the program starts, it first waits for and obtains the first fixed-point stop signal; When a revolution cycle begins, the system divides the entire revolution cycle into four equal time periods (time period 1, time period 2, time period 3, and time period 4) based on the total number of pulses generated by the revolution speed measuring component 500 within that cycle. The duration of each time period is one-quarter of the total number of pulses. Since the number of pulses directly reflects the revolution angle, this segmentation method based on encoder pulses is more accurate than segmentation based solely on time and can eliminate the influence of speed fluctuations. By adjusting the installation phase of the fixed-point sampling block 610, the correspondence between the four time periods and the times when the two sensing disks pass the Hall sensor 720 can be controlled. Specifically: Time period 1 (start and end positions reference) Figure 8During this time period, the first distributed spindle 100 (equipped with the first sensing disk 710) will revolve past the Hall sensor 720. The PLC is responsible for recording the Hall sensor 720 detecting the first sensing disk 710 (at the Hall sensor 720) throughout the entire time period 1. Figure 12 The first signal quantity A is denoted as the first signal quantity A, which is all the pulse signals generated by disk a) and accumulated to obtain a value.

[0049] Time period 2 (start and end positions reference) Figure 9 During this time period, Hall sensor 720 will not detect any sensing disks (because both disks have passed this position); the PLC performs the first judgment: comparing the number A of the first signals recorded in time period 1 with a preset first preset threshold; the first preset threshold is an adjustable variable, the size of which is set according to the ratio of the rotation speed to the revolution speed when the equipment is running normally; if A is greater than the first preset threshold, it means that the rotation speed of the first distributed spindle 100 is normal and its corresponding synchronous belt 200 is not broken; if A is less than or equal to the first preset threshold, it means that the rotation speed of the first distributed spindle 100 is too slow, which may be due to the slippage or breakage of its synchronous belt 200. At this time, a pre-alarm is triggered and a pre-alarm value e is accumulated (e.g., e=1).

[0050] Time period 3 (start and end positions reference) Figure 10 During this time period, the second distributed spindle 1000 (equipped with the second sensing disk 730) will revolve past the Hall sensor 720; the PLC records that during the entire time period 3, the Hall sensor 720 detects the second sensing disk 730 (at... Figure 12 The second signal quantity B is obtained by summing all the pulse signals generated by disk b).

[0051] Time period 4 (start and end positions reference) Figure 11 During this period, Hall sensor 720 again entered a no-signal state. The PLC performed multiple checks: First, the number of second signals B recorded in time period 3 is compared with a second preset threshold. The second preset threshold is usually the same as the first preset threshold and is also an adjustable variable. If B is less than or equal to the second preset threshold, it indicates that the rotational speed of the second distributed spindle 1000 is too slow, which may be due to slippage or breakage of its synchronous belt 200. This also triggers a pre-alarm and accumulates a pre-alarm value e=1.

[0052] Second, calculate the ratio of the first signal quantity A to the second signal quantity B. Specifically, if A ≥ B, calculate A / B; if B > A, calculate B / A. Compare this ratio with a preset range. This ratio reflects the consistency of the rotation speeds of the two distributed spindles. When both synchronous belts 200 are normal or aging synchronously, this ratio should be close to 1. If the ratio exceeds the preset range (for example, greater than a preset threshold), it indicates that there is a significant difference in the tightness or wear of the two synchronous belts 200, which also indicates that there may be potential faults. At this time, a pre-alarm will be triggered and a pre-alarm value e=1 will be accumulated.

[0053] At this point, a complete revolution cycle has ended, and the system awaits the next fixed-point stop signal to begin the next cycle of detection.

[0054] To prevent false alarms caused by transient interference (such as vibration or electromagnetic noise), the detection method of this application introduces a multi-cycle cumulative early warning mechanism. The PLC program automatically accumulates the sum of the pre-alarm values ​​'e' that occurred within the most recent N (e.g., 30) consecutive revolution cycles. Only when the total accumulated pre-alarm value (i.e., the sum of 'e') within these N cycles exceeds a preset third threshold (alarm threshold) will the system officially output a tape break alarm signal on the human-machine interface (HMI), prompting the operator to stop the machine for inspection. If the total pre-alarm value does not exceed the alarm threshold, the system considers these pre-alarms to be intermittent and ignores them.

[0055] In summary, this invention solves the problem of the inability to monitor moving parts at fixed points in planetary mixers by using a "moving disk and fixed sensor" layout; it achieves adaptive monitoring under variable speed conditions by segmenting time periods based on the pulse of the revolution encoder and comparing adjustable thresholds; it eliminates the detection blind spot caused by synchronous wear by introducing the ratio analysis of the number of dual spindle signals; and it greatly improves the accuracy and reliability of alarms through a multi-cycle cumulative early warning mechanism.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The embodiments described above are merely illustrative of implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A belt breakage detection device for a planetary mixing device, the planetary mixing device comprising a revolution gearbox (400), and a first dispersing spindle (100), a second dispersing spindle (1000), and a central spindle (800) disposed within the revolution gearbox (400), wherein the central spindle (800) serves as the revolution axis, the first dispersing spindle (100) and the second dispersing spindle (1000) serve as the rotation axis, both the first dispersing spindle (100) and the second dispersing spindle (1000) are provided with dispersing synchronous pulleys (300), the central spindle (800) is provided with a central synchronous pulley (900), the central synchronous pulley (900) and the dispersing synchronous pulley (300) are connected by a synchronous belt (200), characterized in that, The belt breakage detection device includes: The first sensing disk (710) is disposed on top of the first dispersive spindle (100); The second sensing disk (730) is disposed on top of the second dispersive spindle (1000); A Hall sensor (720) is fixedly mounted on the orbital gearbox (400) and located above the position through which the first dispersive spindle (100) or the second dispersive spindle (1000) revolves. It is used to generate a sensing signal when the first sensing disk (710) or the second sensing disk (730) revolves and passes by the spindle it is on.

2. The belt breakage detection device according to claim 1, characterized in that, The first sensing disk (710) and the second sensing disk (730) have the same structure, both including: Mounting plate (711) is used for fixed connection with the top of the corresponding dispersive spindle; A strong magnet (712) is disposed on the mounting plate (711); A pressure plate (713) is pressed onto the strong magnet (712) and connected to the mounting plate (711) by a fastener (714) to fix the strong magnet (712) onto the mounting plate (711).

3. The belt breakage detection device according to claim 1, characterized in that, It also includes a revolution speed measuring component (500), which includes: The speed measuring code disk (510) is coaxially mounted on the top of the central main shaft (800) and revolves together with the central main shaft (800); A slotted photoelectric sensor (520) is fixedly installed and cooperates with the speed measuring code disk (510) to generate a corresponding number of pulse signals according to the number of teeth of the speed measuring code disk (510) in each revolution cycle.

4. The belt breakage detection device according to claim 3, characterized in that, It also includes a revolution-to-station stop component (600), which includes: A fixed-point stop block (610) is set on the central main shaft (800); A fixed-point stop proximity switch (620) is fixedly installed and cooperates with the fixed-point stop sample block (610) to generate a fixed-point stop signal every time the central spindle (800) revolves once.

5. The belt breakage detection device according to claim 1, characterized in that, The Hall sensor (720) is one in number and is located at the same radial position on the orbital trajectory of the first dispersive spindle (100) and the second dispersive spindle (1000) to generate a sensing signal when the first sensing disk (710) and the second sensing disk (730) pass by respectively.

6. A detection method using the belt breakage detection device as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Obtain the orbital period signal; One orbital period is divided into a first time period, a second time period, a third time period, and a fourth time period; During the first time period, the number A of the first signals A generated by the first sensing disk (710) detected by the Hall sensor (720) is recorded; During the second time period, it is determined whether the number of the first signals A is greater than the first preset threshold. If not, the first pre-alarm value is accumulated. During the third time period, the number B of second signals B generated by the second sensing disk (730) detected by the Hall sensor (720) is recorded; During the fourth time period, it is determined whether the number of the second signal B is greater than the second preset threshold. If not, the second pre-alarm value is accumulated.

7. The detection method according to claim 6, characterized in that, The step of dividing one orbital period into a first time period, a second time period, a third time period, and a fourth time period specifically includes: Based on the total number of pulses generated by the orbital speed measuring component (500) within one orbital cycle, the total number of pulses is divided into four equal parts, and the duration of each part is taken as a time period.

8. The detection method according to claim 6, characterized in that, The detection method further includes: During the fourth time period, the ratio of the first signal quantity A to the second signal quantity B is calculated; Determine whether the ratio is within the preset ratio range. If not, accumulate the third pre-alarm value.

9. The detection method according to any one of claims 6 to 8, characterized in that, The detection method further includes: The sum of the first and second pre-alarm values ​​accumulated within a preset number of consecutive revolution cycles; Determine whether the sum is greater than a third preset threshold. If so, output a band break alarm signal.

10. A planetary mixing device, characterized in that, Includes the belt breakage detection device as described in any one of claims 1 to 5.

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