Permanent magnet electric roller flameproof performance safety protection device and self-test method thereof and flameproof permanent magnet electric roller

Abstract

The application relates to a safety protection device for a permanent magnet electric roller, a self-checking method of the safety protection device and an explosion-proof permanent magnet electric roller. A web plate of the permanent magnet electric roller is arranged as an explosion-proof joint surface between a cylinder, a shaft and an inner side end cover of a bearing, at least one set of displacement sensors is installed at each explosion-proof joint surface through special supports, a signal output end of the displacement sensors is connected with an intelligent fault diagnosis system, the intelligent fault diagnosis system compares a measurement result of the sensors with an initial setting range of the system in real time, an alarm is sent or the permanent magnet electric roller is controlled to stop when the measurement result falls into the initial setting range of the system, an initial value of an explosion-proof gap is measured when the roller does not rotate and is not subjected to or is only subjected to small belt tension, the belt is gradually tensioned through a tensioning device, and the safety protection device is determined to be normal when a change of the measured value of the explosion-proof gap is not zero. The application realizes real-time monitoring of the explosion-proof gap, timely takes safety protection measures, avoids explosion, and eliminates major safety hazards.

Description

Technical Field

[0001] The invention relates to a monitoring and protection device for a flameproof gap of a permanent magnet electric roller and a permanent magnet electric roller capable of realizing flameproof gap self-detection and self-protection. Background Art

[0002] In the past two years, permanent magnet electric rollers have gained favor among coal mine users for their simple structure, high transmission efficiency, and small size, and the number of manufacturers has increased rapidly. If permanent magnet electric rollers are used in dangerous places such as underground coal mines where explosive gases are present, they need to be made into explosion-proof structures, and the explosion-proof gap is closely related to whether they can be explosion-proof. The explosion-proof standard stipulates that the maximum gap should be 0.3 to 0.8 mm based on the type of the explosion-proof product's mating surface and the minimum width of the mating surface. Currently, the test related to the explosion-proof gap of permanent magnet electric rollers is only to measure the explosion-proof dimensions of related parts using ordinary measuring tools before the permanent magnet electric rollers are assembled. After assembly, regardless of whether they are used or not, the explosion-proof gap is no longer tested. Therefore, it is unknown whether permanent magnet electric rollers that have passed the explosion-proof test in the laboratory can always meet the explosion-proof test standards in actual use. Considering that the permanent magnet electric drum consists of a cylindrical rotor with permanent magnets embedded in it and a non-rotating shaft stator with coils embedded in it, it is composed of a permanent magnet motor. When installed at the drive roller position of the belt conveyor, it must withstand the huge tension of the belt required to prevent slipping (up to more than 100 tons), and rotate at a speed of about 60 revolutions per minute. In other words, the permanent magnet electric drum needs to withstand huge dynamic compound forces during actual use. The flameproof gap is likely to undergo dynamic changes, and the risk of explosion failure is huge. Therefore, the current practice is to limit the power of the permanent magnet electric drum to within 315kw according to regulations. This approach only reduces the risk to a certain extent, but cannot completely avoid the risk, and limits the power of the permanent magnet electric drum. Summary of the Invention

[0003] The present invention aims to provide a permanent magnet electric drum explosion-proof performance safety protection device and a self-test method thereof, as well as an explosion-proof permanent magnet electric drum, which can monitor the dynamic changes of the explosion-proof gap of the permanent magnet electric drum in real time. Once it falls into the initial set range, an alarm is immediately issued or the power is directly cut off, thereby solving the problem of major safety hazards when the permanent magnet electric drum is used in dangerous places with explosion-proof requirements.

[0004] The main technical solutions of the present invention are:

[0005] A permanent magnet electric drum explosion-proof performance safety protection device includes a displacement sensor, a sensor mounting bracket, a signal transmission device, and an intelligent fault diagnosis system. At least one set of the displacement sensors is installed at each explosion-proof joint surface of the permanent magnet electric drum, and the installation method is to directly install them on the relevant parts of the permanent magnet electric drum or to install them on the relevant parts of the permanent magnet electric drum with the aid of the sensor mounting bracket. The signal output ends of all displacement sensors are connected to the intelligent fault diagnosis system via the signal transmission device. When the permanent magnet electric drum is operating normally, the intelligent fault diagnosis system receives measurement result signals from the displacement sensors and instantly compares the measurement results with the system's initial setting range. When the measurement result of any displacement sensor falls within the system's initial setting range, the intelligent fault diagnosis system issues an alarm and / or controls the permanent magnet electric drum to stop.

[0006] The displacement sensor adopts an inductive displacement sensor, or a capacitive barrier displacement sensor and an infrared ranging sensor. When the capacitive barrier displacement sensor and the infrared ranging sensor are adopted, the capacitive barrier displacement sensor is arranged at the explosion-proof joint surface between the web and the cylinder and the explosion-proof joint surface between the web and the inner end cover of the bearing, and the infrared ranging sensor is arranged at the explosion-proof joint surface between the web and the shaft.

[0007] It is preferred to set one or more pairs of displacement sensors at the same explosion-proof joint surface, and the two sets of displacement sensors in each pair of displacement sensors are arranged 180 degrees apart in the circumferential direction. When multiple pairs of displacement sensors are set, each pair of displacement sensors is evenly arranged along the circumferential direction.

[0008] A self-test method for a permanent magnet electric drum flameproof performance safety protection device adopts the above-mentioned permanent magnet electric drum flameproof performance safety protection device, measures the initial value of the flameproof gap and records the data when the permanent magnet electric drum is not rotating and is not subject to tape tension or is only subject to a small tension state, then uses a tape tensioning device to tension the tape wrapped around the permanent magnet electric drum to a certain degree, measures the flameproof gap data again and calculates the change in the flameproof gap, or directly measures the change in the flameproof gap. If the change in the flameproof gap is not zero, it is considered that the measured flameproof gap data is normal and valid, and the permanent magnet electric drum flameproof performance safety protection device is normal.

[0009] A flameproof permanent magnet electric roller comprises a cylinder, a web, a shaft, a displacement sensor, a sensor mounting bracket, a signal transmission device and an intelligent fault diagnosis system. The left and right webs are respectively supported on the shaft by left and right bearings for rotation. The left and right ends of the cylinder are respectively fixedly connected to the left and right webs. The inner sides of the left and right webs are respectively fixed with left and right bearing inner end covers. The left and right bearing inner end covers are sleeved on the shaft and rotatably connected between the shafts. The left and right bearing inner end covers serve as axial limits for the outer rings of the left and right bearings respectively. The cylindrical mating surface between the web and the cylinder, the cylindrical mating surface between the web and the shaft, and the flat annular mating surface between the web and the bearing inner end cover are flameproof joint surfaces. At least one set of the displacement sensors is installed at each explosion-proof joint surface. The installation method is to directly install them on the relevant parts of the permanent magnet electric roller or to install them on the relevant parts of the permanent magnet electric roller with the help of the sensor mounting bracket. The signal output ends of all displacement sensors are connected to the intelligent fault diagnosis system through the signal transmission device. When the permanent magnet electric roller is working normally, the intelligent fault diagnosis system receives the measurement result signal from the displacement sensor and compares the measurement result with the initial setting range of the system in real time. When the measurement result of any displacement sensor falls within the initial setting range of the system, the intelligent fault diagnosis system issues an alarm and / or controls the permanent magnet electric roller to stop.

[0010] Capacitive displacement sensors are preferably installed at the explosion-proof joint surface between the web and the cylinder, and at the explosion-proof joint surface between the web and the inner end cover of the bearing. Infrared ranging sensors are preferably installed at the explosion-proof joint surface between the web and the shaft, or inductive displacement sensors are installed at all explosion-proof joint surfaces.

[0011] At a single location where a capacitive gate displacement sensor is arranged, two moving gates and one or two fixed gates are preferably arranged, the two moving gates are arranged in the axial direction and radial direction respectively, the two moving gates share one fixed gate, the fixed gate is arranged between the two moving gates and located at the intersection of the two moving gates, or the two moving gates correspond one to one with the two fixed gates, and the two fixed gates are arranged side by side between the two moving gates and located at the intersection of the two moving gates.

[0012] The beneficial effects of the present invention are:

[0013] The shell of a permanent magnet electric drum must withstand not only torque but also the pressure from the radial tension of the conveyor belt. During long-term continuous operation, the shell is highly likely to experience dynamic changes in the flameproof gap under the action of large alternating stresses. The present invention equips each permanent magnet electric drum with a permanent magnet electric drum flameproof performance safety protection device to monitor the dynamic changes of the flameproof gap in real time. When the flameproof gap at any monitoring point reaches the system's initial set range, a warning or power-off safety protection measure is issued. This prevents the permanent magnet electric drum from causing a major safety accident due to explosion failure caused by the flameproof structure in places with explosive gases, ensuring the safe and reliable operation of the permanent magnet electric drum in explosive environments.

[0014] By configuring the safety protection device of the present invention, the changes in the flameproof gap can be dynamically monitored in real time during the operation of the flameproof permanent magnet electric drum, and whether the flameproof gap is within the allowable range can be understood in real time, thereby understanding the safety and reliability of the permanent magnet electric drum. Therefore, while ensuring that the drum strength of the permanent magnet electric drum is sufficient, the power of the permanent magnet electric drum can be expanded without restriction, which is of great significance to the promotion and application of permanent magnet electric drum products and the effective protection of safe production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of an embodiment of the flameproof permanent magnet electric drum (including a flameproof gap online detection system) of the present invention;

[0016] Figure 2 yes Figure 1 A-direction view;

[0017] Figure 3 This is a schematic diagram of the preferred arrangement of multiple pairs of displacement sensors for a flameproof joint;

[0018] Figure 4 This is a schematic diagram of the preferred arrangement of a set of capacitive displacement sensors for a flameproof gap measurement point.

[0019] Reference numerals:

[0020] 1. Cylinder; 2. Web; 3. Shaft; 4. Bearing; 5. Inner end cover of bearing; 6. Base; 7. Outer end cover of bearing; 8-1. Signal sending device; 8-2. Signal receiving device; 9. Intelligent fault diagnosis system; 10. Capacitive gate displacement sensor; 10-1. Moving gate; 10-2. Fixed gate; 11. Sensor mounting bracket. DETAILED DESCRIPTION

[0021] The present invention discloses a permanent magnet electric drum explosion-proof performance safety protection device, such as Figure 1-4As shown, the system includes displacement sensors, a sensor mounting bracket 11, a signal transmission device, and an intelligent fault diagnosis system 9. At least one displacement sensor is installed at each flameproof joint of the permanent magnet motorized drum, either directly on the relevant parts of the permanent magnet motorized drum or with the aid of the sensor mounting bracket 11. The displacement sensors are used to measure the absolute value and change in the flameproof gap at the corresponding flameproof joint in real time. The signal outputs of all displacement sensors are connected to the intelligent fault diagnosis system via the signal transmission device, and the measurement result signals of the displacement sensors are transmitted to the intelligent fault diagnosis system via the signal transmission device. When the permanent magnet motorized drum is operating normally, the intelligent fault diagnosis system receives the measurement result signals from the displacement sensors and compares the measurement results with the system's initial set range in real time, making a judgment and sending the diagnosis results to the host computer. If the measurement result of any displacement sensor falls within the system's initial set range, the intelligent fault diagnosis system issues an alarm and / or controls the permanent magnet motorized drum to stop (for example, by controlling the permanent magnet motorized drum's power switch to cut off the power supply to the permanent magnet motorized drum), prohibiting the permanent magnet motorized drum from continuing to operate. The thresholds for controlling alarms and parking can also be set separately, for example, an alarm is given when a lower threshold is exceeded and the car is stopped when a higher threshold is exceeded.

[0022] At the same time, the present invention also discloses a flameproof permanent magnet electric roller (hereinafter referred to as a permanent magnet electric roller), which uses the above-mentioned permanent magnet electric roller flameproof performance safety protection device to perform real-time online detection of the flameproof gap and to provide safety protection for the permanent magnet electric roller when the flameproof gap exceeds the standard. Figure 1-4As shown, the flameproof permanent magnet electric drum comprises a cylinder 1, a web 2, a shaft 3, a displacement sensor, a sensor mounting bracket 11, a signal transmission device, and an intelligent fault diagnosis system 9. The left and right webs are rotatably supported on the shaft via left and right bearings 4, respectively. The left and right ends of the cylinder are fixedly connected to the left and right webs, respectively. Left and right bearing inner end caps 5 are fixed to the inner sides of the left and right webs (i.e., the sides facing each other). These left and right bearing inner end caps are sleeved onto the shaft 3 and rotatably connected thereto. The left and right bearing inner end caps serve as axial limiters for the outer rings of the left and right bearings 4, respectively. The cylindrical mating surfaces between the web and the cylinder, the cylindrical mating surfaces between the web and the shaft, and the planar annular mating surfaces between the web and the bearing inner end caps constitute the flameproof joint surfaces. At least one displacement sensor is installed at each flameproof joint surface, either directly on a relevant component of the permanent magnet electric drum or via the sensor mounting bracket. The signal output ends of all displacement sensors are connected to the intelligent fault diagnosis system 9 through the signal transmission device. When the permanent magnet electric drum is operating normally, the intelligent fault diagnosis system receives the measurement result signals from the displacement sensors and compares the measurement results with the system's initial set range in real time. When the measurement result of any displacement sensor falls within the system's initial set range, the intelligent fault diagnosis system issues an alarm and / or controls the permanent magnet electric drum to stop.

[0023] The initial setting range of the system can be an open interval with the specified explosion-proof gap threshold as the lower limit. The range should not be too narrow to avoid missed alarms or frequent alarms, nor should it be too wide to ensure the timeliness of alarms and protection.

[0024] The permanent magnet electric drum of the present invention can also be used in other occasions with explosion-proof requirements, for example, as a permanent magnet electric drum used in conjunction with explosion-proof winches, hoists, etc.

[0025] The intelligent fault diagnosis system may include a central processing unit (also known as a program controller) and a memory, communication circuit, and input / output devices connected to the central processing unit in a bidirectional manner. The central processing unit is also connected to an alarm circuit and a power control circuit. The power control circuit controls the on / off of the power supply circuit of the permanent magnet electric roller. The central processing unit is used for data processing and comparison, and for result determination. The memory is used to store basic data such as the initial gap value, the system's initial setting range, information from each sensor and its actual measured data, as well as determination result data. The communication circuit enables communication between the intelligent fault diagnosis system and the host computer, and the signal transmission device is connected to the communication circuit. The input / output devices are used to accept manual parameter settings and display and output monitoring conditions. The alarm circuit can trigger early warning prompts in the form of sound and light.

[0026] The left and right bearing outer end caps 7 are fixed to the outer sides of the left and right plates, respectively. These outer end caps fit over shaft 3 and are rotatably connected to the shaft. Dynamic seals are installed between the bearing outer end caps and the shaft. These outer end caps serve as axial limiters for the outer rings of the left and right bearings 4, respectively. For the same bearing, the limit direction of the outer end caps is opposite to that of the inner end caps. The ends of the shaft extend outside the cylindrical body and are fixedly mounted on the left and right bases 6, respectively.

[0027] The permanent magnet electric roller is a thin-walled cylindrical structure. In actual application, the shaft and the stator winding fixed on the shaft do not rotate, and the shell composed of the cylinder and the web rotates around the shaft. The shell not only bears the torque but also the pressure caused by the tension of the conveyor belt. During the long-term continuous operation of the electric roller, the shell is subjected to large alternating stress, which may cause the explosion-proof gap in the permanent magnet electric roller to change dynamically. The present invention equips each permanent magnet electric roller with a set of explosion-proof gap online detection system to monitor the explosion-proof gap and its changes of each explosion-proof joint surface of the permanent magnet electric roller in real time. When it is detected that the explosion-proof gap is about to exceed the gap range specified by the standard, an alarm is issued or the permanent magnet electric roller is prohibited from running, so that the structural abnormality of the permanent magnet electric roller and the risk of explosion-proof structure failure are discovered at the first time, avoiding the permanent magnet electric roller from causing explosion failure in places where explosive gas exists and causing major safety accidents, thereby ensuring the long-term safe use of the permanent magnet electric roller equipment.

[0028] After the permanent magnet electric roller is assembled and tested successfully, the displacement sensor will transmit the relevant information at the explosion-proof joint surface measured for the first time to the intelligent fault diagnosis system through the signal transmission device. It will be stored as the system initial gap value in the intelligent fault diagnosis system. During the subsequent use of the permanent magnet electric roller, if the force (such as belt tension) on the permanent magnet electric roller exceeds the allowable range or a part is damaged, the explosion-proof gap will usually change significantly. Therefore, if it is found that the difference between the actual measured value of the explosion-proof gap and the system initial gap value, that is, the change in the explosion-proof gap exceeds the reasonable limit, it can be determined that there is a problem with the quality of the permanent magnet electric roller. The step of measuring and saving the system initial gap value can be placed in the program initialization setting process of the intelligent fault diagnosis system to ensure the execution of this step.

[0029] When the space required to directly mount the displacement sensor on a permanent magnet electric drum is limited, the sensor mounting bracket can be used for installation, making installation simpler and more convenient. The sensor mounting bracket is typically a special-shaped structural component, designed based on the structure and dimensions of the drum cavity, the displacement sensor to be deployed, and the flameproof joint surface. It is installed within the drum cavity during use. By using the sensor mounting bracket to secure the displacement sensor, as long as there is sufficient space within the drum cavity, the placement of the displacement sensor is largely unrestricted by the structure and dimensions of the permanent magnet electric drum components, making it suitable for all models of permanent magnet electric drums.

[0030] When the displacement sensor is fixed with the aid of a sensor mounting bracket, each set of displacement sensor is equipped with a separate set of sensor mounting brackets.

[0031] The displacement sensor preferably uses a capacitive displacement sensor 10 and may also include an infrared ranging sensor. The permanent magnet electric drum has three types of explosion-proof joints: the web-to-cylinder explosion-proof joint I, the web-to-bearing inner end cover explosion-proof joint II, and the web-to-shaft explosion-proof joint III. The web-to-cylinder explosion-proof joint I and the web-to-shaft explosion-proof joint III are cylindrical explosion-proof joints, while the web-to-bearing inner end cover explosion-proof joint II is a flat explosion-proof joint. The capacitive displacement sensor 10 is preferably installed at the web-to-cylinder explosion-proof joint I and the web-to-bearing inner end cover explosion-proof joint II, and the infrared ranging sensor is preferably installed at the web-to-shaft explosion-proof joint III.

[0032] Alternatively, inductive displacement sensors may be provided at all explosion-proof joint surfaces.

[0033] Each set of sensor mounting brackets 11 may include a first bracket and a second bracket that are separate from each other. The first bracket and the second bracket are respectively fixedly connected to the two parts that constitute the explosion-proof joint surface. In the installed state, the first bracket and the second bracket are not in contact. When a capacitive grid displacement sensor is used, the movable grid 10-1 and the fixed grid 10-2 of the capacitive grid displacement sensor are respectively fixedly connected to the first bracket and the second bracket, and the fixing method can be welding or bonding. When an infrared ranging sensor is used, the infrared transmitting module and the infrared receiving module of the infrared ranging sensor are respectively fixedly connected to the first bracket and the second bracket. In this embodiment, the infrared transmitting module is preferably fixedly connected to the shaft relative to the permanent magnet electric roller. When an inductive displacement sensor is used, the coil and the armature are respectively fixedly connected to the first bracket and the second bracket.

[0034] It is preferred to set one or more pairs of displacement sensors at the same flameproof joint surface. The specific number of pairs can be determined according to the flameproof size and structure of the cylinder. When the detection accuracy requirement is high and the structural size of the relevant parts allows, more pairs of displacement sensors can be set. Figure 3As shown, the two displacement sensors in each pair are preferably spaced 180 degrees apart circumferentially. When multiple pairs of displacement sensors are provided, the pairs are preferably evenly spaced circumferentially. For radial gaps, such as the gaps between the web and cylinder and between the web and shaft, if the gaps change, the detection result of one displacement sensor in a pair will normally increase, while the detection result of the other displacement sensor will decrease. This arrangement allows for more accurate measurement of changes in the circumferential gap. For example, when two pairs of displacement sensors, totaling four, are deployed at the same flameproof joint, each adjacent pair is spaced 90 degrees apart circumferentially. The two displacement sensors in each pair are positioned at the same axial position. More preferably, all displacement sensors at the same flameproof joint are positioned at the same axial position. For example, when two pairs of capacitive barrier displacement sensors are deployed at flameproof joint I between the web and cylinder, all four capacitive barrier displacement sensors are positioned at the same axial position relative to the permanent magnet motor drum, with each pair spaced 90 degrees apart circumferentially.

[0035] Each set of capacitive grid displacement sensors preferably includes two moving grids and one or two fixed grids, such as Figure 4 As shown, two moving gates are arranged in the axial and radial directions, respectively. They share a fixed gate, which is positioned between the two moving gates and located at their intersection. When each capacitive gate displacement sensor has two moving gates and two fixed gates, the moving gates correspond one to the fixed gates, and the two fixed gates are arranged side by side between the two moving gates and located at their intersection. The fixed gates are arranged perpendicular to both the axial and radial directions. This arrangement allows for simultaneous measurement of displacement at a single location on a flameproof joint in both the axial and radial directions.

[0036] The signal transmission device can be a flameproof cable or a wireless signal transmission device, the former is wired transmission, and the latter is wireless transmission. During wired transmission, the sensor signal is led out of the inner cavity of the cylinder through an anti-interference shielded signal line through a flameproof power cable introduction device, and is connected to the intelligent fault diagnosis system. This embodiment adopts a wireless signal transmission device, which includes a signal sending device 8-1 and a signal receiving device 8-2. Each set of displacement sensors is equipped with a signal transmission device, wherein the signal sending device can share the same power supply with the corresponding displacement sensor, and the signal sending device sends the measurement result signal of the displacement sensor according to the designed time interval. The signal receiving device receives the signal transmitted by the signal sending device in real time, and then transmits it to the intelligent fault diagnosis system.

[0037] The intelligent fault diagnosis system is arranged in a flameproof electric control box outside the cylinder of the permanent magnet electric drum.

[0038] The permanent magnet electric drum explosion-proof performance safety protection device may further include other sensing components such as vibration sensors to increase the parameter categories for online detection in the system. The signal output ends of various sensors are connected to the intelligent fault diagnosis system, which performs analysis and judgment and issues an alarm or takes other protective measures when necessary.

[0039] The present invention also discloses a self-inspection method for a permanent magnet electric roller explosion-proof performance safety protection device. The method is applicable to the above-mentioned permanent magnet electric roller explosion-proof performance safety protection device. The method measures the initial value of the explosion-proof gap and records the data when the permanent magnet electric roller is not rotating and is not subject to tape tension or is only subject to a small tension state. Then, the tape tensioning device is used to tension the tape wrapped around the permanent magnet electric roller to a certain extent, and the explosion-proof gap data is measured again and the change in the explosion-proof gap is calculated, or the change in the explosion-proof gap is directly measured. If the change in the explosion-proof gap is not zero, it is considered that the measured explosion-proof gap data is normal and valid, and the permanent magnet electric roller explosion-proof performance safety protection device is normal, indicating that the corresponding permanent magnet electric roller can be operated with power.

Claims

1. A permanent magnet electric drum explosion-proof performance safety protection device, characterized by: The system comprises a displacement sensor, a sensor mounting bracket, a signal transmission device and an intelligent fault diagnosis system. At least one displacement sensor is installed at each explosion-proof joint surface of the permanent magnet electric roller for real-time measurement of the explosion-proof gap at the corresponding explosion-proof joint surface. The signal output ends of all displacement sensors are connected to the intelligent fault diagnosis system via the signal transmission device. When the permanent magnet electric roller is operating normally, the intelligent fault diagnosis system receives the measurement result signal from the displacement sensor and compares the measurement result with the system's initial setting range in real time. When the measurement result of any displacement sensor falls within the system's initial setting range, the intelligent fault diagnosis system issues an alarm and / or Or control the parking of the permanent magnet electric drum; the displacement sensor adopts a capacitive grid displacement sensor and an infrared ranging sensor, the capacitive grid displacement sensor is arranged at the explosion-proof joint surface between the web and the cylinder and the explosion-proof joint surface between the web and the inner end cover of the bearing, and the infrared ranging sensor is arranged at the explosion-proof joint surface between the web and the shaft; each set of capacitive grid displacement sensors includes two moving grids and one or two fixed grids, the two moving grids are arranged in the axial direction and radial direction respectively, the two moving grids share one fixed grid, the fixed grid is arranged between the two moving grids and located at the intersection of the two moving grids, or the two moving grids correspond to the two fixed grids one by one, and the two fixed grids are arranged side by side between the two moving grids and located at the intersection of the two moving grids.

2. The explosion-proof performance safety protection device for a permanent magnet electric drum according to claim 1, characterized in that: Each set of sensor mounting brackets includes a first bracket and a second bracket that are separate from each other. The first bracket and the second bracket are respectively fixedly connected to the two parts that constitute the explosion-proof joint surface. In the installed state, the first bracket and the second bracket do not contact each other; when a capacitive barrier displacement sensor is used, the movable barrier and the fixed barrier of the capacitive barrier displacement sensor are respectively fixedly connected to the first bracket and the second bracket; when an infrared ranging sensor is used, the infrared transmitting module and the infrared receiving module of the infrared ranging sensor are respectively fixedly connected to the first bracket and the second bracket.

3. The explosion-proof performance safety protection device for a permanent magnet electric drum according to claim 1 or 2, characterized in that: The signal transmission device is a flameproof cable or a wireless signal transmission device.

4. The explosion-proof performance safety protection device for a permanent magnet electric drum according to claim 1 or 2, characterized in that: The intelligent fault diagnosis system is arranged in a flameproof electric control box outside the cylinder of the permanent magnet electric drum.

5. The explosion-proof performance safety protection device for a permanent magnet electric drum according to claim 3, characterized in that: The intelligent fault diagnosis system is arranged in a flameproof electric control box outside the cylinder of the permanent magnet electric drum.

6. The explosion-proof performance safety protection device for a permanent magnet electric drum according to claim 1 or 2, characterized in that: One or more pairs of displacement sensors are set at the same explosion-proof joint surface. The two sets of displacement sensors in each pair of displacement sensors are arranged 180 degrees apart in the circumferential direction. When multiple pairs of displacement sensors are set, each pair of displacement sensors is evenly arranged along the circumferential direction.

7. The explosion-proof performance safety protection device for a permanent magnet electric drum according to claim 3, characterized in that: One or more pairs of displacement sensors are set at the same explosion-proof joint surface. The two sets of displacement sensors in each pair of displacement sensors are arranged 180 degrees apart in the circumferential direction. When multiple pairs of displacement sensors are set, each pair of displacement sensors is evenly arranged along the circumferential direction.

8. The explosion-proof performance safety protection device for a permanent magnet electric drum according to claim 4, characterized in that: One or more pairs of displacement sensors are set at the same explosion-proof joint surface. The two sets of displacement sensors in each pair of displacement sensors are arranged 180 degrees apart in the circumferential direction. When multiple pairs of displacement sensors are set, each pair of displacement sensors is evenly arranged along the circumferential direction.

9. The explosion-proof performance safety protection device for a permanent magnet electric drum according to claim 5, characterized in that: One or more pairs of displacement sensors are set at the same explosion-proof joint surface. The two sets of displacement sensors in each pair of displacement sensors are arranged 180 degrees apart in the circumferential direction. When multiple pairs of displacement sensors are set, each pair of displacement sensors is evenly arranged along the circumferential direction.

10. A flameproof permanent magnet electric drum, characterized by: The invention comprises a cylinder, a web, a shaft, a displacement sensor, a sensor mounting bracket, a signal transmission device and an intelligent fault diagnosis system. The left and right webs are respectively supported on the shaft by left and right bearings for rotation. The left and right ends of the cylinder are respectively fixedly connected to the left and right webs. The inner sides of the left and right webs are respectively fixed with left and right bearing inner end covers, which are sleeved on the shaft and rotatably connected between the shafts. The left and right bearing inner end covers are respectively used as axial limits for the outer rings of the left and right bearings. The cylindrical mating surface between the web and the cylinder, the cylindrical mating surface between the web and the shaft, and the flat annular mating surface between the web and the bearing inner end cover are explosion-proof joint surfaces. At least one set of the displacement sensor is installed at each explosion-proof joint surface for real-time measurement of the explosion-proof gap at the corresponding explosion-proof joint surface. The signal output ends of all displacement sensors are connected to the intelligent fault diagnosis system through the signal transmission device. The permanent magnet electric roller is During normal operation, the intelligent fault diagnosis system receives the measurement result signal from the displacement sensor and compares the measurement result with the system's initial setting range in real time. When the measurement result of any displacement sensor falls within the system's initial setting range, the intelligent fault diagnosis system issues an alarm and / or controls the permanent magnet electric drum to stop. Capacitive grid displacement sensors are provided at the explosion-proof joint surface between the web and the cylinder, and at the explosion-proof joint surface between the web and the inner end cover of the bearing, and an infrared ranging sensor is provided at the explosion-proof joint surface between the web and the shaft. At a single location where the capacitive grid displacement sensor is arranged, two moving grids and one or two fixed grids are provided. The two moving grids are arranged axially and radially, respectively. The two moving grids share one fixed grid, which is provided between the two moving grids and located at the intersection of the two moving grids. Alternatively, the two moving grids correspond one-to-one to the two fixed grids, and the two fixed grids are arranged side by side between the two moving grids and located at the intersection of the two moving grids.

11. The flameproof permanent magnet motor drum according to claim 10, characterized in that: Each set of sensor mounting brackets includes a first bracket and a second bracket that are separate from each other. The first bracket and the second bracket are respectively fixedly connected to the two parts that constitute the explosion-proof joint surface. In the installed state, the first bracket and the second bracket are not in contact. When a capacitive grid displacement sensor is set, the movable grid and the fixed grid of the capacitive grid displacement sensor are respectively fixedly connected to the first bracket and the second bracket; when an infrared ranging sensor is set, the infrared transmitting module and the infrared receiving module of the infrared ranging sensor are respectively fixedly connected to the first bracket and the second bracket.

12. The flameproof permanent magnet motor drum according to claim 10 or 11, characterized in that: An independent flameproof electric control box is also provided outside the cylinder, and the intelligent fault diagnosis system is arranged in the flameproof electric control box.

13. The flameproof permanent magnet motor drum according to claim 10 or 11, characterized in that: The signal transmission device is a flameproof cable or a wireless signal transmission device.

14. The flameproof permanent magnet motor drum according to claim 12, characterized in that: The signal transmission device is a flameproof cable or a wireless signal transmission device.

15. The flameproof permanent magnet motor drum according to claim 10 or 11, characterized in that: One or more pairs of displacement sensors are set at the same explosion-proof joint surface. The two sets of displacement sensors in each pair of displacement sensors are arranged 180 degrees apart in the circumferential direction. When multiple pairs of displacement sensors are set, each pair of displacement sensors is evenly arranged along the circumferential direction.

16. The flameproof permanent magnet motor drum according to claim 12, characterized in that: One or more pairs of displacement sensors are set at the same explosion-proof joint surface. The two sets of displacement sensors in each pair of displacement sensors are arranged 180 degrees apart in the circumferential direction. When multiple pairs of displacement sensors are set, each pair of displacement sensors is evenly arranged along the circumferential direction.

17. The flameproof permanent magnet motor drum according to claim 13, characterized in that: One or more pairs of displacement sensors are set at the same explosion-proof joint surface. The two sets of displacement sensors in each pair of displacement sensors are arranged 180 degrees apart in the circumferential direction. When multiple pairs of displacement sensors are set, each pair of displacement sensors is evenly arranged along the circumferential direction.

18. The flameproof permanent magnet motor drum according to claim 14, characterized in that: One or more pairs of displacement sensors are set at the same explosion-proof joint surface. The two sets of displacement sensors in each pair of displacement sensors are arranged 180 degrees apart in the circumferential direction. When multiple pairs of displacement sensors are set, each pair of displacement sensors is evenly arranged along the circumferential direction.

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