Transmission system failure detection device and agitator

Abstract

This utility model discloses a transmission system failure detection device and a stirrer, relating to the field of mechanical transmission system stall detection. The transmission system includes: a rotating shaft; a protective cover sleeved over the rotating shaft, the protective cover having an opening; the transmission system failure detection device includes: a fixing component, which can be fixed to the rotating shaft by clamping, the fixing component being positioned on the rotating shaft corresponding to the opening; a sensing element, the sensing element being disposed on the fixing component; a connecting component, the connecting component being used to connect to the outer wall of the protective cover; and a sensor, the sensor being disposed on the connecting component, and part of the sensor being able to extend into the opening to detect the rotational state of the sensing element. This application can solve the problem that the sensing component installed on the rotating shaft will have an adverse effect on the rotating shaft.

Description

Technical Field

[0001] This utility model relates to the field of stall detection of mechanical transmission systems, and in particular to a transmission system failure detection device and agitator. Background Technology

[0002] In existing mechanical transmission system technologies, most methods employ speed sensors in conjunction with sensing components to detect transmission failures. These sensing components can be protrusions welded to the shaft, one or more recesses milled into the shaft, or extensions of the shaft to accommodate the sensing component, or metal patches glued to the shaft. All of these detection methods have drawbacks. Firstly, adding or removing components or structures from the shaft may increase stress, compromise its rigidity, and reduce its balance and lifespan. Secondly, glued patches to the shaft as sensing components are prone to detachment, reducing the reliability of the detection device. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a transmission system failure detection device, which can solve the problem that the installation of the sensing component on the rotating shaft will have an adverse effect on the rotating shaft.

[0004] The specific technical solution of this utility model embodiment is as follows: A transmission system failure detection device, the transmission system comprising: a rotating shaft; a protective cover sleeved over the rotating shaft, the protective cover having an opening; The transmission system failure detection device includes: A fixing component is provided, which can be fixed to the rotating shaft by clamping, and the position of the fixing component on the rotating shaft corresponds to the opening; A sensor, which is disposed on the fixed assembly; A connecting assembly for connecting to the outer wall of the shield; A sensor is disposed on the connecting assembly, and a portion of the sensor is capable of extending into the opening to detect the rotational state of the sensing element.

[0005] Preferably, there is an even number of sensors, and the even number of sensors are arranged symmetrically about the center of the rotating shaft.

[0006] Preferably, the connection component includes: A support member having a mounting hole in which the sensor is mounted; The support member is fixedly connected to the outer wall of the protective cover via the connector.

[0007] Preferably, the fixing component includes at least two clamping members, which are used to fix the rotating shaft by clamping, and the at least two clamping members are arranged symmetrically about the center of the rotating shaft.

[0008] Preferably, the clamping member has a fitting portion in the middle that matches the shape of the outer side wall of the rotating shaft; The fixing assembly includes at least two locking members, which connect the ends of two adjacent clamping members to clamp the rotating shaft.

[0009] Preferably, the locking member includes a bolt assembly; the clamping member has a first through hole at each end, so that the bolt assembly passes through the first through hole.

[0010] Preferably, the sensing element has a second through hole through which the bolt assembly passes to secure the sensing element.

[0011] Preferably, the sensing element has a bent portion such that at least a portion of the sensing element is located outside the end of the clamping member, and when the sensing element is rotated to a position corresponding to the sensor, at least a portion of the sensing element is positioned directly opposite the probe portion of the sensor.

[0012] Preferably, the detection distance between the sensing element and the sensor is between 5mm and 20mm.

[0013] A stirrer, the stirrer comprising: Electric motor; Stirring components; The transmission system includes a rotating shaft, a protective cover fitted over the rotating shaft, and an opening in the protective cover. The motor is connected to the stirring assembly via the transmission system. Transmission system failure detection device as described in any of the above.

[0014] The technical solution of this utility model has the following significant beneficial effects: When the transmission system failure detection device of this application is installed on the transmission system, when the shaft malfunctions, the sensor can detect the abnormality immediately by detecting the rotational state of the sensing element, and thus output a signal to the control system for timely handling to prevent accidents. The transmission system failure detection device of this application is fixed to the shaft by a clamping assembly with the sensing element. This allows the sensing element to be installed on the shaft inside the protective cover without extending the shaft length, damaging the shaft structure, or increasing shaft stress. Furthermore, this installation method is compact and space-saving; even if it falls off, the fixing assembly and the sensing element will only fall inside the protective cover and will not fly out and injure people. In addition, since the sensor is connected to the outer wall of the protective cover via a connecting assembly, installation, maintenance, and replacement are convenient.

[0015] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0016] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0017] Figure 1 This is a front view of the transmission system failure detection device installed on the transmission system in an embodiment of this utility model; Figure 2 for Figure 1 Cross-sectional view at point AA; Figure 3 for Figure 1 Cross-sectional view at point BB; Figure 4 This is a front view of the support member in an embodiment of this utility model; Figure 5 This is a side view of the support member in an embodiment of the present utility model; Figure 6 This is a front view of the sensing element in an embodiment of this utility model; Figure 7 This is a side view of the sensing element in an embodiment of the present utility model; Figure 8 This is a front view of the clamping component in an embodiment of this utility model; Figure 9 This is a top view of the clamping component in an embodiment of the present utility model; Figure 10 This is a schematic diagram of the stirrer in an embodiment of the present invention.

[0018] The reference numerals in the above figures are as follows: 1. Fixing component; 11. Clamping component; 111. Fitting part; 112. First through hole; 12. Locking component; 2. Sensing component; 21. Second through hole; 22. Bending part; 3. Connecting component; 31. Support component; 311. Mounting hole; 312. Third through hole; 32. Connecting component; 4. Sensor; 100. Transmission system; 1001. Rotating shaft; 1002. Protective cover; 10021. Opening; 200. Motor; 300. Stirring component. Detailed Implementation

[0019] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.

[0020] To address the issue of adverse effects on the rotating shaft caused by mounting sensing components on it, this application proposes a transmission system failure detection device. This device can be used to detect failures in the transmission system. For example, a failure could refer to abnormal rotation of the transmission system, such as a stoppage in transmission, an abnormal increase or decrease in rotational speed, etc.

[0021] In this application, Figure 1 This is a front view of the transmission system failure detection device installed on the transmission system in an embodiment of this utility model. Figure 2 for Figure 1 Cross-sectional view at point AA. Figure 3 for Figure 1 Cross-sectional view at point BB, as shown Figures 1 to 3 As shown, the transmission system 100 may include: a rotating shaft 1001; and a protective cover 1002 sleeved over the rotating shaft 1001, the protective cover 1002 having an opening 10021. The opening 10021 allows the sensor 4 to extend into the protective cover 1002, enabling the sensor 4 to detect the sensing element 2. The protective cover 1002 protects the rotating shaft 1001 to prevent other objects or people from contacting the rotating shaft 1001 and causing danger.

[0022] like Figures 1 to 3 As shown, the transmission system failure detection device may include: a fixing component 1, which can be fixed on the rotating shaft 1001 by clamping, and the position of the fixing component 1 on the rotating shaft 1001 corresponds to the opening 10021; a sensing element 2, which is disposed on the fixing component 1; a connecting component 3, which is used to connect to the outer wall of the cover 1002; and a sensor 4, which is disposed on the connecting component 3, and part of the sensor 4 can extend into the opening 10021 to detect the rotation state of the sensing element 2.

[0023] When the transmission system failure detection device of this application is installed on the transmission system 100, when an abnormality occurs in the rotating shaft 1001, the sensor 4 can detect the abnormality of the rotating shaft 1001 immediately by detecting the rotation state of the sensing element 2, and thus output a signal to the control system so that it can be dealt with in a timely manner to avoid accidents. The transmission system failure detection device of this application is fixed to the rotating shaft 1001 by clamping through the fixing component 1 with the sensing element 2. In this way, the sensing element 2 can be installed on the rotating shaft 1001 inside the protective cover 1002 without extending the length of the rotating shaft 1001, without damaging the structure of the rotating shaft 1001, and without increasing the shaft stress. Moreover, this installation method has a compact structure and occupies little space. Even if it falls off, the fixing component 1 and the sensing element 2 will only fall inside the protective cover 1002 and will not fly out and injure people. In addition, since the sensor 4 is connected to the outer wall of the protective cover 1002 through the connecting component 3, it is convenient for installation, maintenance and replacement.

[0024] To better understand the transmission system failure detection device in this application, it will be further explained and described below. For example... Figures 1 to 3 As shown, the transmission system failure detection device may include: a fixing component 1, a sensing element 2, a connecting component 3, and a sensor 4. The fixing component 1 is used to fix itself to the rotating shaft 1001 by clamping. Specifically, the clamping method means that the fixing component 1 can clamp the rotating shaft 1001, thus fixing itself to the rotating shaft 1001. This method will not damage the structure of the rotating shaft 1001, nor will it affect the lifespan of the rotating shaft 1001. Furthermore, even if the sensing element 2 detaches under the above installation method, the fixing component 1 and the sensing element 2 will only fall into the protective cover 1002, and will not fly out and injure anyone. The position of the fixing component 1 on the rotating shaft 1001 corresponds to the opening 10021. The sensing element 2 is disposed on the fixing component 1. In this way, when at least part of the sensor 4 extends into the cover 1002 through the opening 10021, when the rotating shaft 1001 drives the sensing element 2 to rotate, the sensor 4 can correspond to the sensing element 2 in the axial direction of the rotating shaft 1001, so that the sensor 4 can detect the rotation state of the sensing element 2.

[0025] The sensor 2 can be one or more. When there are multiple sensors 2, they can be distributed around the circumferential direction of the rotating shaft 1001. Preferably, as follows... Figure 2 As shown, there can be an even number of sensors 2, and the even number of sensors 2 can be arranged symmetrically around the center of the rotating shaft 1001. In this way, when the rotating shaft 1001 drives the sensors 2 to rotate, the weight of the sensors 2 will not disrupt the balance of the rotating shaft 1001.

[0026] In one feasible implementation, the fixing component 1 may include a clamping member 11, which can be bent so that its two ends are located on both sides of the rotating shaft 1001, thereby clamping the rotating shaft 1001, and then working with the locking member 12 to fix it to the rotating shaft 1001.

[0027] In another implementation, such as Figure 2 As shown, the fixing component 1 may include at least two clamping members 11. The at least two clamping members 11 are used to fix the rotating shaft 1001 by clamping, and the at least two clamping members 11 are arranged symmetrically about the center of the rotating shaft 1001. With this structure, when the rotating shaft 1001 drives the sensing element 2 to rotate, the weight of the fixing component 1 will not disrupt the balance of the rotating shaft 1001.

[0028] To ensure that the clamping component 11 is more stable and secure when clamped on the rotating shaft 1001, and to reduce the possibility of it loosening and falling off. Figure 8 This is a front view of the clamping component in an embodiment of this utility model. Figure 9 This is a top view of the clamping member in an embodiment of the present invention, as shown below. Figure 8 and Figure 9 As shown, the clamping member 11 may have a fitting portion 111 that matches the shape of the outer side wall of the rotating shaft 1001, thereby increasing the contact area between the clamping member 11 and the rotating shaft 1001. The fitting portion 111 may be located in the middle of the clamping member 11. For example, when the cross-section of the rotating shaft 1001 is circular, the fitting portion 111 may be arc-shaped.

[0029] When the fixing assembly 1 includes two clamping members 11, in order for the two clamping members 11 to tightly clamp the rotating shaft 1001, it is feasible to, for example Figure 2 As shown, the fixing assembly 1 includes at least two locking members 12, which connect the ends of two adjacent clamping members 11 to clamp the rotating shaft 1001.

[0030] Furthermore, such as Figure 2As shown, at least two locking elements 12 can be installed symmetrically around the center of the rotating shaft 1001. With this structure, when the rotating shaft 1001 drives the sensing element 2 to rotate, the weight of the locking elements 12 will not disrupt the balance of the rotating shaft 1001.

[0031] In one specific implementation, such as Figure 2 As shown, the locking element 12 may include a bolt assembly. (As illustrated...) Figure 8 and Figure 9 As shown, the clamping member 11 has a first through hole 112 at both ends, so that the bolt assembly passes through the first through hole 112. By tightening the bolt assembly, the end of the clamping member 11 is tightened, so that the clamping member 11 can tightly clamp the rotating shaft 1001.

[0032] The sensor 2 is connected to the fixed component 1, and this application does not limit the connection method. Alternatively, Figure 6 This is a front view of the sensing element in an embodiment of this utility model. Figure 7 This is a side view of the sensing element in an embodiment of the present invention, as shown below. Figure 6 and Figure 7 As shown, the sensing element 2 may have a second through hole 21, through which the bolt assembly passes to fix the sensing element 2. For example, the sensing element 2 may be located between the head of the bolt and the clamping member 11, and the sensing element 2 is fixed by clamping it with the head of the bolt and the clamping member 11.

[0033] Furthermore, such as Figure 2 , Figure 6 and Figure 7 As shown, the sensing element 2 may have a bent portion 22, so that at least a portion of the sensing element 2 is located outside the end of the clamping member 11, and when the sensing element 2 rotates to a position corresponding to the sensor 4, at least a portion of the sensing element 2 is directly opposite the probe portion of the sensor 4. With this structure, when the rotating shaft 1001 rotates, the area of ​​the sensing element 2 facing the sensor 4 can be effectively increased, ensuring that the sensor 4 can sweep across the sensing element 2 over a large area, fully forming an inductive magnetic field and increasing the sensing effect between the two. For example, when the rotating shaft 1001 rotates once, it can generate the same number of pulse signals as the sensing element 2, and output contact signals through the internal processing circuit of the sensor 4.

[0034] Furthermore, such as Figure 6 As shown, the second through hole 21 can extend along the extension direction of the sensing element 2, thereby allowing the position of the sensing element 2 relative to the clamping member 11 to be adjusted, so as to adjust the position of the sensing element 2 in the radial direction of the rotating shaft 1001, and thus adjust the detection sensing distance between the sensing element 2 and the sensor 4.

[0035] The connecting assembly 3 is used to connect to the outer wall of the protective cover 1002. The sensor 4 is disposed on the connecting assembly 3. The sensor 4 is thus fixedly mounted on the outer wall of the protective cover 1002 via the connecting assembly 3. To ensure the distance between the sensor 4 and the sensing element 2, so that the sensor 4 can reliably and accurately detect the rotation state of the sensing element 2, a portion of the sensor 4 can extend into the opening 10021 to detect the rotation state of the sensing element 2. For example, the sensor 4 can be an electromagnetic induction element. Non-contact detection technology can reduce the damage rate of the sensor 4, reduce the replacement of the sensor 4, and reduce the maintenance of the device.

[0036] The connecting component 3 can be installed on the outer wall of the protective cover 1002 through various mechanical connection methods or welding methods, and this application does not limit its connection method. In one feasible embodiment, Figure 4 This is a front view of the support member in an embodiment of this utility model. Figure 5 This is a side view of the support member in an embodiment of the present invention, as shown below. Figure 2 , Figure 4 and Figure 5 As shown, the connecting assembly 3 includes: a support member 31, which has a mounting hole 311 in which the sensor 4 is installed; and a connector 32, which fixes the support member 31 to the outer wall of the cover 1002. Specifically, the connector 32 can be a bolt or screw, etc., and the support member 31 can have at least one third through hole 312, typically two. The connector 32 passes through the third through hole 312 and is screwed into the outer wall of the cover 1002 to achieve fixed installation of the support member 31. The third through hole 312 can extend along the extension direction of the support member 31, allowing the position of the support member 31 relative to the cover 1002 to be adjusted to a certain extent in the extension direction of the third through hole 312, thus improving the alignment between the sensor 4 and the sensing element 2. The support member 31 can have internal threads, and the outer wall of the sensor 4 has at least a portion of external threads, allowing the sensor 4 and the support member 31 to be installed and disassembled via a threaded connection, facilitating later maintenance and repair. With the above structure, the existing structure of the cover 1002 of the rotating shaft 1001 can be fully utilized. The sensor 4 can be installed simply by drilling a threaded hole in the cover 1002, and the sensor 4 can be close to the surface of the cover 1002 without occupying other space.

[0037] After the sensor 4 is installed and connected to the outer wall of the cover 1002 via the connecting component 3, the sensor 4 can be connected to the control system via a cable lead-out line. The control system monitors the changes in the contact signal and sets an automatic shutdown program to protect the equipment of the transmission system 100. Alternatively, monitoring screens for operation, stop, alarm, and shutdown can be created on the control system to allow the operator to see the operating status of the corresponding equipment of the transmission system 100 more intuitively.

[0038] To ensure a high sensing effect between the sensing element 2 and the sensor 4, it is feasible to, for example... Figure 2 As shown, the detection distance D between the sensing element 2 and the sensor 4 can be controlled between 5mm and 20mm. If the detection distance between the sensing element 2 and the sensor 4 is too close, the sensor 4 is prone to interference with the bent part 22 of the sensing element 2, which may cause damage to the sensor 4; if the detection distance between the sensing element 2 and the sensor 4 is too far, the sensing effect between the sensing element 2 and the sensor 4 will be too weak.

[0039] As the rotating shaft 1001 rotates, it drives the sensing element 2 to rotate via the fixed assembly 1. The rotation of the sensing element 2 creates a changing magnetic field inside and outside the sensor 4. The signal processor inside the sensor 4 converts the physical rotation speed signal into a recognizable electrical signal and outputs an electrical contact signal to the control system. When the transmission system 100 is operating normally, the sensor 4 outputs a contact signal corresponding to the rotation speed frequency. When the transmission system 100 malfunctions, the contact signal output by the sensor 4 does not correspond to the rotation speed frequency, indicating a change in the contact state of the sensor 4. In this case, the control system can issue an alarm signal and a stop command to halt the corresponding equipment, effectively preventing a larger production accident.

[0040] A mixer is a device used to stir and mix two or more materials to achieve uniform dispersion or reaction. It has wide applications in many fields such as chemical, food, and pharmaceutical industries and is a key piece of equipment in industrial production lines. The mixer is mainly driven by a motor and belt to rotate the agitator or impeller, generating strong shearing forces and eddies to thoroughly mix the materials within the container. Simultaneously, the reaction forces acting on the mixer shaft and belt are also significant, sometimes leading to shaft and belt breakage, resulting in transmission system failure. The main causes of this are excessive torque, material defects, installation errors, belt wear, and shaft fatigue. This phenomenon is a serious mechanical failure, extremely dangerous, and can trigger a series of chain reactions, significantly impacting safe production and economic efficiency. The main hazards include: 1. Transmission interruption, agitation stoppage, and material reaction and concentration failing to meet process requirements; 2. Fragments from broken agitator shafts, belts, etc., can damage the transmission mechanism, causing deformation and breakage of the agitator drum, belt guards, etc., and may even be thrown out at high speed, causing injury; 3. Causing unplanned downtime, disrupting production schedules, especially in concrete and chemical operations, potentially leading to the shutdown of the entire production line; 4. Failure to stop transmission failure in time leads to increasing material accumulation, causing severe blockages that are difficult to clean manually; 5. In flammable and explosive material reactors, vibration and frictional heat generated by broken agitator shafts or belts may trigger fires or chemical explosions. Therefore, in the event of transmission failure, an alarm must be sounded immediately and the agitator and upstream and downstream equipment must be stopped to protect the entire production line.

[0041] Therefore, a stirrer is also proposed in this application. Figure 10 This is a schematic diagram of the stirrer in an embodiment of the present invention, as shown below. Figure 10 As shown, the stirrer may include: a motor 200; a stirring assembly 300; and a transmission system 100. The transmission system 100 may include a rotating shaft 1001 and a protective cover 1002 fitted over the rotating shaft 1001. The protective cover 1002 has an opening 10021. The motor 200 is connected to the stirring assembly 300 via the transmission system 100. A transmission system failure detection device, as described above, may also be included. The rotating shaft 1001 can be connected to the stirring assembly 300. Further, the transmission system 100 may include a belt, allowing the motor 200 to drive the rotating shaft 1001 to rotate via the belt.

[0042] The transmission system failure detection device can reliably detect the failure of the agitator's transmission system 100, and can prevent problems such as transmission system 100 failure caused by agitator shaft breakage or belt breakage, thereby effectively preventing larger production accidents.

[0043] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0044] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A drive system failure detection apparatus characterized by comprising: The transmission system includes: a rotating shaft; a protective cover sleeved over the rotating shaft, the protective cover having an opening; The transmission system failure detection device includes: A fixing component is provided, which can be fixed to the rotating shaft by clamping, and the position of the fixing component on the rotating shaft corresponds to the opening; A sensor, which is disposed on the fixed assembly; A connecting assembly for connecting to the outer wall of the shield; A sensor is disposed on the connecting assembly, and a portion of the sensor is capable of extending into the opening to detect the rotational state of the sensing element.

2. The drive system failure detection apparatus according to claim 1, characterized by, There is an even number of sensors, and the even number of sensors are arranged symmetrically about the center of the rotating shaft.

3. The drive system failure detection apparatus according to claim 1, characterized by, The connection component includes: A support member having a mounting hole in which the sensor is mounted; The support member is fixedly connected to the outer wall of the protective cover via the connector.

4. The drive system failure detection apparatus according to claim 1, characterized by The fixing component includes at least two clamping members, which are used to fix the rotating shaft by clamping. The at least two clamping members are arranged symmetrically about the center of the rotating shaft.

5. The drive system failure detection apparatus according to claim 4, characterized by The clamping member has a fitting portion in the middle that matches the shape of the outer side wall of the rotating shaft; The fixing assembly includes at least two locking members, which connect the ends of two adjacent clamping members to clamp the rotating shaft.

6. The drive system failure detection apparatus according to claim 5, characterized by The locking member includes a bolt assembly; the clamping member has a first through hole at each end, so that the bolt assembly passes through the first through hole.

7. The drive system failure detection apparatus according to claim 6, characterized by The sensing element has a second through hole, through which the bolt assembly passes to secure the sensing element.

8. The drive system failure detection apparatus according to claim 7, characterized by The sensing element has a bent portion such that at least a portion of the sensing element is located outside the end of the clamping member, and when the sensing element is rotated to a position corresponding to the sensor, at least a portion of the sensing element is positioned directly opposite the probe portion of the sensor.

9. The drive system failure detection apparatus according to claim 1, characterized by, The detection distance between the sensing element and the sensor is between 5mm and 20mm.

10. A whisk, characterized by The stirrer includes: Electric motor; Stirring components; The transmission system includes a rotating shaft, a protective cover fitted over the rotating shaft, and an opening in the protective cover. The motor is connected to the stirring assembly via the transmission system. The transmission system failure detection device as described in any one of claims 1 to 9.

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