CN212784931U - Permanent magnet electric roller explosion-proof performance safety protection device and explosion-proof permanent magnet electric roller - Google Patents

Abstract

The utility model relates to a permanent magnetism motorized pulley flame proof performance safety arrangement and flame proof type permanent magnetism motorized pulley, permanent magnetism motorized pulley's panel respectively with the barrel, set up to the flame proof composition surface between axle and the bearing inside end cover, every flame proof composition surface department is through one set at least displacement sensor of special support mounting, displacement sensor's signal output part connects intelligent fault diagnosis system, intelligent fault diagnosis system carries out the comparison with the measuring result of sensor immediately with system initial set scope, send the warning or control permanent magnetism motorized pulley when measuring result falls into system initial set scope and parks. The utility model discloses a to flame proof clearance real-time supervision, in time take the safety protection measure, avoid losing the explosion, eliminate great potential safety hazard.

Description

Permanent magnet electric roller explosion-proof performance safety protection device and explosion-proof permanent magnet electric roller

Technical Field

The utility model relates to a monitoring protection device in flame proof clearance and a permanent magnet motorized pulley that can realize flame proof clearance self-test and self-protection for permanent magnet motorized pulley.

Background

In recent two years, the permanent magnet electric roller is favored by coal mine users due to excellent performances of simple structure, high transmission efficiency, small size and the like, and the number of production enterprises is rapidly increased. If the permanent magnet electric roller is used in dangerous places with explosive gases such as underground coal mines, an explosion-proof structure is required, and an explosion-proof gap is closely related to whether explosion can be prevented. The explosion-proof standard is regulated according to the type of a joint surface of an explosion-proof product and the minimum width of the joint surface, and the maximum gap is 0.3-0.8 mm. At present, the detection related to the explosion-proof gap of the permanent magnet electric roller is only to measure the explosion-proof size of related parts by using a common measuring tool before the permanent magnet electric roller is assembled, and no matter whether the permanent magnet electric roller is used after the permanent magnet electric roller is assembled, the explosion-proof gap is not tested any more, so that whether the permanent magnet electric roller qualified through explosion-proof inspection in a laboratory can always meet the explosion-proof inspection standard in the actual use is an unknown number. Considering that a permanent magnet motor is formed by a cylinder rotor embedded with a permanent magnet and a non-rotating shaft stator embedded with a coil, and is installed at the position of a driving roller of a belt conveyor, the permanent magnet motor not only bears the huge tension (up to one hundred tons) for tensioning an adhesive tape to prevent slipping, but also rotates at the speed of about 60 revolutions per minute, namely the permanent magnet motor roller needs to bear the action of huge dynamic compound force in the actual use process, the explosion-proof gap is likely to generate dynamic change, and the explosion loss risk is huge, so the current method limits the use power of the permanent magnet motor roller within 315kw according to the regulation. This reduces the risk only to a certain extent, but does not completely circumvent the risk and limits the power of the permanent-magnet motorized pulley.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a permanent magnetism motorized pulley flame proof performance safety arrangement and flame proof type permanent magnetism motorized pulley, but the dynamic change in real-time supervision permanent magnetism motorized pulley's flame proof clearance in case fall into the initial set scope and send the warning immediately or directly cut off the power supply, has solved the problem that has great potential safety hazard when permanent magnetism motorized pulley is used for having the dangerous place of flame proof requirement.

The utility model discloses a main technical scheme has:

a permanent magnet electric roller explosion-proof performance safety protection device comprises a displacement sensor, a sensor mounting bracket, a signal transmission device and an intelligent fault diagnosis system, wherein at least one set of displacement sensor is mounted at each explosion-proof joint surface of the permanent magnet electric roller in a mode of being directly mounted on related parts of the permanent magnet electric roller or being mounted on the related parts of the permanent magnet electric roller by means of the sensor mounting bracket, signal output ends of all the displacement sensors are connected with the intelligent fault diagnosis system through the signal transmission device, the intelligent fault diagnosis system comprises a central processing unit, a storage, a communication circuit and an input and output device, the storage, the communication circuit and the input and output device are in two-way communication connection with the central processing unit, the central processing unit is further connected with an alarm circuit and a power supply control circuit, and the power supply control circuit controls the on, when the permanent magnet electric roller normally works, the intelligent fault diagnosis system receives a measurement result signal from the displacement sensor and compares the measurement result with the system initial setting range in real time, and when the measurement result of any displacement sensor falls into the system initial setting range, the intelligent fault diagnosis system gives an alarm and/or controls the permanent magnet electric roller to stop.

The displacement sensor adopts an inductive displacement sensor or a capacitive grating displacement sensor and an infrared distance measuring sensor, when the capacitive grating displacement sensor and the infrared distance measuring sensor are adopted, the capacitive grating displacement sensor is arranged at the flameproof joint surface of the web and the cylinder body and the flameproof joint surface of the web and the bearing inner side end cover, and the infrared distance measuring sensor is arranged at the flameproof joint surface of the web and the shaft.

One or more pairs of displacement sensors are preferably arranged on the same explosion-proof joint surface, two sets of displacement sensors in each pair of displacement sensors are arranged at intervals of 180 degrees in the circumferential direction, and when the plurality of pairs of displacement sensors are arranged, the displacement sensors in each pair are uniformly arranged along the circumferential direction.

A flame-proof type permanent magnet electric roller comprises a roller body, a web plate, a shaft, a displacement sensor, a sensor mounting bracket, a signal transmission device and an intelligent fault diagnosis system, wherein a left web plate and a right web plate are respectively rotatably supported on the shaft through a left bearing and a right bearing, the left end and the right end of the roller body are respectively fixedly connected with the left web plate and the right web plate, the outer sides of the left web plate and the right web plate are respectively fixedly provided with a left bearing outer end cover and a right bearing outer end cover, the left bearing outer end cover and the right bearing outer end cover are sleeved on the shaft and are rotatably connected with the shaft, a dynamic seal is arranged between the bearing outer end cover and the shaft, the inner sides of the left web plate and the right web plate are respectively fixedly provided with a left bearing inner end cover and a right bearing inner end cover, the left bearing inner end cover and the right bearing inner end covers are respectively sleeved on the shaft and are rotatably connected with the shaft, the left bearing inner end covers and right bearing inner end covers are, at least one set of displacement sensor is arranged on each flameproof joint face, the displacement sensors are directly arranged on related parts of the permanent magnet electric roller or arranged on related parts of the permanent magnet electric roller by means of the sensor mounting bracket, the signal output ends of all the displacement sensors are connected with the intelligent fault diagnosis system through the signal transmission device, the intelligent fault diagnosis system comprises a central processing unit, a storage device, a communication circuit and an input and output device which are in bidirectional communication connection with the central processing unit, the central processing unit is also connected with an alarm circuit and a power supply control circuit, the power supply control circuit controls the on-off of a power supply circuit of the permanent magnet electric roller, and when the permanent magnet electric roller normally works, the intelligent fault diagnosis system receives a measurement result signal from the displacement sensors and compares the measurement result with a system initial setting range in real time, when the measurement result of any displacement sensor falls into the initial setting range of the system, the intelligent fault diagnosis system gives an alarm and/or controls the permanent magnet electric drum to stop.

A capacitive grating displacement sensor is preferably arranged at the flameproof joint surface of the amplitude plate and the cylinder body and the flameproof joint surface of the amplitude plate and the end cover at the inner side of the bearing, an infrared distance measuring sensor is preferably arranged at the flameproof joint surface of the amplitude plate and the shaft, or inductive displacement sensors are arranged at all flameproof joint surfaces.

Preferably, two movable grids and one or two fixed grids are arranged at the position where the capacitive grid displacement sensors are arranged one by one, the two movable grids are respectively arranged along the axial direction and the radial direction, the two movable grids share one fixed grid, the fixed grid is arranged between the two movable grids and is positioned at the intersection of the two movable grids, or the two movable grids correspond to the two fixed grids one by one, and the two fixed grids are arranged between the two movable grids side by side and are positioned at the intersection of the two movable grids.

The utility model has the advantages that:

the shell of the permanent magnet electric roller is required to bear torque and pressure caused by radial tensioning strength of the conveying rubber belt, and the possibility that the explosion-proof gap is dynamically changed under the action of large alternating stress is high in the long-time continuous operation process. The utility model discloses a for one set of permanent magnet electric cylinder flame proof performance safety arrangement of every permanent magnet electric cylinder configuration, the dynamic change in real-time supervision flame proof clearance, the flame proof clearance when an arbitrary monitoring point reaches system initial set scope, then send safety protection measures such as early warning or outage, avoid permanent magnet electric cylinder to cause the explosion loss and the major incident appears because of the flame proof structural failure in explosive gas existence place, ensure the safe and reliable of permanent magnet electric cylinder in the operation of explosive environment.

Through the configuration the utility model discloses a safety arrangement can be in the change of flame proof type permanent magnet electric cylinder operation in-process real-time dynamic monitoring flame proof clearance, whether master the flame proof clearance in real time in the allowed band to master permanent magnet electric cylinder's fail safe nature, so under the sufficient condition of the barrel intensity of guaranteeing permanent magnet electric cylinder, can not be unrestricted to enlarge permanent magnet electric cylinder's service power, have important meaning to the popularization and application and the effective protection safety in production of permanent magnet electric cylinder product.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the flameproof permanent magnet motorized drum (including a flameproof gap online detection system) of the present invention;

FIG. 2 is a view in the direction A of FIG. 1;

FIG. 3 is a schematic diagram of a preferred arrangement of pairs of displacement sensors for one flameproof interface;

FIG. 4 is a schematic diagram of a preferred arrangement mode of a set of capacitive grating displacement sensors for one flameproof gap measurement point.

Reference numerals:

1. a barrel; 2. a web; 3. a shaft; 4. a bearing; 5. a bearing inner side end cover; 6. a base; 7. a bearing outer end cover; 8-1, a signal transmitting device; 8-2, a signal receiving device; 9. an intelligent fault diagnosis system; 10. a capacitive displacement sensor; 10-1, moving grid; 10-2, fixing a grid; 11. a sensor mounting bracket.

Detailed Description

The utility model discloses a permanent magnetism motorized pulley flame proof performance safety arrangement, as shown in fig. 1-4, including displacement sensor, sensor installing support 11, signal transmission device and intelligent failure diagnosis system 9, every flame proof composition surface department of permanent magnetism motorized pulley all installs at least one set displacement sensor, the mounting means be on the relevant part of direct mount permanent magnetism motorized pulley or with the help of on the relevant part of permanent magnetism motorized pulley is installed to sensor installing support 11. And the displacement sensor is used for measuring the absolute value and the variation value of the explosion-proof gap at the corresponding explosion-proof joint surface in real time. The signal output ends of all the displacement sensors are connected with the intelligent fault diagnosis system through the signal transmission device, and measuring result signals of the displacement sensors are transmitted to the intelligent fault diagnosis system through the signal transmission device. When the permanent magnet electric roller works normally, the intelligent fault diagnosis system receives a measurement result signal from the displacement sensor, compares the measurement result with the system initial setting range in real time, makes a judgment and sends the diagnosis result to an upper computer. When the measurement result of any displacement sensor falls into the initial setting range of the system, the intelligent fault diagnosis system gives an alarm and/or controls the permanent magnet electric drum to stop (for example, the power supply of the permanent magnet electric drum is cut off by controlling a power supply switch of the permanent magnet electric drum), and the permanent magnet electric drum is forbidden to continue to operate. The thresholds upon which the control alarm and the stop are based may also be set separately, for example, alarm above a certain lower threshold and stop above a certain higher threshold.

Simultaneously the utility model also discloses a flame-proof type permanent magnetism motorized pulley (can be referred to as permanent magnetism motorized pulley for short), wherein adopted above-mentioned permanent magnetism motorized pulley flame proof performance safety arrangement to carry out real-time on-line measuring to the flame proof clearance to carry out safety protection to permanent magnetism motorized pulley when the flame proof clearance exceeds standard. As shown in fig. 1-4, the flameproof permanent magnet electric drum comprises a drum body 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 by left and right bearings 4, respectively. The left and right ends of the cylinder are respectively fixedly connected with the left and right amplitude plates, the inner sides (namely the opposite sides of the two amplitude plates) of the left and right amplitude plates are respectively fixed with a left and right bearing inner side end cover 5, and the left and right bearing inner side end covers are sleeved on the shaft 3 and are rotatably connected with the shaft. The end covers at the inner sides of the left bearing and the right bearing are respectively used for axial limiting of the outer ring of the left bearing 4 and the outer ring of the right bearing 4. The cylindrical matching surface between the amplitude plate and the cylinder, the cylindrical matching surface between the amplitude plate and the shaft and the plane circular matching surface between the amplitude plate and the end cover at the inner side of the bearing are explosion-proof joint surfaces. At least one set of displacement sensor is arranged at each flameproof joint surface, and the displacement sensors are directly arranged on related parts of the permanent magnet electric roller or arranged on the related parts of the permanent magnet electric roller by means of the sensor mounting bracket. And the signal output ends of all the displacement sensors are connected with the intelligent fault diagnosis system 9 through the signal transmission device. When the permanent magnet electric roller normally works, the intelligent fault diagnosis system receives a measurement result signal from the displacement sensor and compares the measurement result with the system initial setting range in real time, and when the measurement result of any displacement sensor falls into the system initial setting range, the intelligent fault diagnosis system gives an alarm and/or controls the permanent magnet electric roller to stop.

The initial setting range of the system can be an opening range with a specified explosion-proof clearance threshold value as a lower limit value, the range is not too narrow, missing report or frequent alarm is avoided, and the range is not too wide, so that the timeliness of alarm and protection is ensured.

The utility model discloses a permanent magnetism motorized pulley also can be used to other occasions that have the flame proof requirement, for example as the permanent magnetism motorized pulley etc. that cooperate such as flame proof winch, lifting machine.

The intelligent fault diagnosis system can comprise a central processing unit (also called a program controller), a memory, a communication circuit and an input/output device, wherein the memory, the communication circuit and the input/output device are in bidirectional communication connection with the central processing unit, the central processing unit is also connected with an alarm circuit and a power supply control circuit, and the power supply control circuit controls the on-off of a power supply circuit of the permanent magnet electric roller. The central processing unit is used for processing and comparing data and judging results, the memory is used for storing basic data such as an initial gap value, a system initial setting range and the like, information of each sensor and actual measurement data information thereof, judgment result data and the like, the communication circuit can realize communication between the intelligent fault diagnosis system and an upper computer, and the signal transmission device is connected with the communication circuit. The input and output device is used for receiving manual setting of parameters, displaying and outputting monitoring conditions and the like. The alarm circuit can start early warning prompt in an acousto-optic mode.

And the outer sides of the left and right amplitude plates are respectively fixed with a left and right bearing outer end cover 7, the left and right bearing outer end covers are sleeved on the shaft 3 and are rotatably connected with the shaft, and a dynamic seal is arranged between the bearing outer end covers and the shaft. The left and right bearing outer end covers are respectively used for axial limiting of outer rings of the left and right bearings 4, and the limiting direction of the bearing outer end cover is opposite to that of the bearing inner end cover aiming at the same bearing. The two ends of the shaft extend out of the cylinder body, and the left end and the right end of the shaft are respectively and fixedly arranged on the left base 6 and the right base 6.

The permanent magnet electric drum is a thin-wall cylindrical structure, in practical application, the central shaft and a stator winding fixed on the shaft do not rotate, and a shell formed by the drum body and a web rotates around the shaft. The shell not only bears the torque, but also bears the pressure brought by the tension force of the conveying belt. In the process of long-time continuous operation of the electric roller, the shell bears large alternating stress, so that the explosion-proof gap in the permanent magnet electric roller is likely to dynamically change. The utility model discloses a for one set of flame proof clearance on-line measuring system of every permanent magnet motorized pulley configuration, the flame proof clearance and the situation of change of each flame proof composition surface of real-time supervision permanent magnet motorized pulley, when detecting the flame proof clearance and be about to exceed standard regulation clearance scope, through reporting to the police or forbidding the operation of permanent magnet motorized pulley, the very first time discovers permanent magnet motorized pulley's structure abnormity and flame proof structure inefficacy risk, avoid permanent magnet motorized pulley to have explosive gas to exist the place and cause the explosion loss and the major safety accident appears, ensure the long-term safe use of permanent magnet motorized pulley equipment.

After the permanent magnet electric roller is assembled and successfully operated, the displacement sensor transmits the related information of the explosion-proof joint surface measured for the first time to the intelligent fault diagnosis system through the signal transmission device. May be stored in the intelligent fault diagnosis system as a system initial clearance value. In the subsequent use process of the permanent magnet electric roller, if the stress (such as belt tension) of the permanent magnet electric roller exceeds the allowable range or some part is damaged, the explosion-proof gap generally changes greatly, so that if the difference between the actual measurement value of the explosion-proof gap and the initial gap value of the system, namely the variation of the explosion-proof gap exceeds the reasonable limit, the quality of the permanent magnet electric roller can be judged to have a problem. The step of measuring and saving the system initial clearance value can be placed in the program initialization setting flow of the intelligent fault diagnosis system to ensure the execution of the step.

When the displacement sensor is directly fixed on the permanent magnet electric roller and the space is limited, the displacement sensor can be installed and fixed by means of the sensor installation support, so that the installation operation is simpler and more convenient. The sensor mounting bracket is usually a special-shaped structural part, is designed mainly according to the comprehensive consideration of the structure and the size of the inner cavity of the cylinder body of the permanent magnet electric roller, the displacement sensor to be arranged and the explosion-proof joint surface, and is mounted in the inner cavity of the cylinder body during use. The displacement sensor is fixed by the aid of the sensor mounting bracket, and the arrangement of the displacement sensor is basically not limited by the part structure and the size of the permanent magnet electric roller as long as the space of the inner cavity of the roller body is enough, so that the permanent magnet electric roller can be applied to various types.

When the displacement sensors are fixed by means of the sensor mounting brackets, each set of displacement sensor is independently matched with one set of sensor mounting bracket.

The displacement sensor is preferably a capacitive grating displacement sensor 10, and may further include an infrared distance measuring sensor. The explosion-proof joint of the permanent magnet electric roller comprises a first explosion-proof joint of a web and a cylinder body, a second explosion-proof joint of a web and an end cover at the inner side of a bearing and a third explosion-proof joint of the web and a shaft. The explosion-proof joint I of the amplitude plate and the cylinder body and the explosion-proof joint III of the amplitude plate and the shaft are cylinder explosion-proof joints, and the explosion-proof joint II of the amplitude plate and the end cover at the inner side of the bearing is a plane explosion-proof joint. The capacitance grid displacement sensor 10 is preferably arranged at the explosion-proof joint I of the amplitude plate and the cylinder body and the explosion-proof joint II of the amplitude plate and the end cover at the inner side of the bearing, and the infrared distance measuring sensor is preferably arranged at the explosion-proof joint III of the amplitude plate and the shaft.

Or all the explosion-proof joint surfaces are provided with the inductive displacement sensors.

Each set of sensor mounting bracket 11 can comprise a first bracket and a second bracket which are mutually separated, the first bracket and the second bracket are respectively and fixedly connected with two parts forming an explosion-proof joint surface, and the first bracket and the second bracket are not contacted in a mounting state. When the capacitive grid displacement sensor is adopted, the movable grid 10-1 and the fixed grid 10-2 of the capacitive grid displacement sensor are respectively and fixedly connected to the first support and the second support, and the fixing mode can adopt welding or bonding. When the infrared distance measuring sensor is adopted, the infrared transmitting module and the infrared receiving module of the infrared distance measuring sensor are respectively and fixedly connected to the first support and the second support. In this embodiment, the infrared emission module is preferably fixedly connected to the shaft of the permanent magnet motorized drum, and when an inductive displacement sensor is used, the coil and the armature are fixedly connected to the first bracket and the second bracket, respectively.

One or more pairs of displacement sensors are preferably arranged at the same explosion-proof joint surface, and the specific number of pairs can be determined according to the explosion-proof size and structure of the cylinder body. When the requirement on detection accuracy is high and the structural size of related parts allows, a plurality of pairs of displacement sensors can be arranged. As shown in fig. 3, the two sets of displacement sensors in each pair are preferably arranged at intervals of 180 degrees in the circumferential direction, and when a plurality of pairs of displacement sensors are provided, the pairs of displacement sensors are preferably arranged uniformly in the circumferential direction. For radial gaps, such as the explosion-proof gap between the explosion-proof joint surface of the amplitude plate and the cylinder body and the explosion-proof joint surface of the amplitude plate and the shaft, if the explosion-proof gap is changed, the detection result of one set of displacement sensor in the pair of displacement sensors is increased and the detection result of the other set of displacement sensor is decreased under normal conditions. By adopting the arrangement mode, the change of the circumferential explosion-proof gap can be measured more accurately. For example, when two pairs of four sets of displacement sensors are arranged on the same flameproof joint surface, every two sets of displacement sensors adjacent to each other in the circumferential direction are arranged at intervals of 90 degrees. The two sets of displacement sensors in each pair are arranged at the same axial position. Preferably, all the sets of displacement sensors adopted at the same flameproof joint surface are arranged at the same axial position. For example, when two pairs of capacitive grid displacement sensors are arranged on the explosion-proof joint I of the amplitude plate and the cylinder body, the axial positions of all four sets of capacitive grid displacement sensors relative to the permanent magnet electric cylinder are the same, and the circumferential positions are spaced by 90 degrees in pairs.

Each capacitive grating displacement sensor preferably comprises two movable gratings and one or two fixed gratings, as shown in fig. 4, the two movable gratings are respectively arranged along the axial direction and the radial direction, the two movable gratings share one fixed grating, and the fixed grating is arranged between the two movable gratings and is located at the intersection of the two movable gratings. When each set of capacitive grating displacement sensor is provided with two movable gratings and two fixed gratings, the movable gratings correspond to the fixed gratings one by one, the two fixed gratings are arranged between the two movable gratings side by side and positioned at the intersection of the two movable gratings, and the arrangement direction of the two fixed gratings is simultaneously vertical to the axial direction and the radial direction. By adopting the arrangement mode, the displacement of one position of one explosion-proof joint surface in two different directions of the axial direction and the radial direction can be measured simultaneously.

The signal transmission device can be an explosion-proof cable or a wireless signal transmission device, wherein the signal transmission device is in wired transmission, and the signal transmission device is in wireless transmission. During wired transmission, sensor signals are led out of the inner cavity of the cylinder body through an anti-interference shielding signal wire and an explosion-proof power cable leading-in device and are connected with an intelligent fault diagnosis system. The present embodiment employs a wireless signal transmission apparatus including a signal transmission apparatus 8-1 and a signal reception apparatus 8-2. Each set of displacement sensor is provided with a signal transmission device, wherein the signal transmission device and the corresponding displacement sensor can share the same power supply, and the signal transmission device transmits the measurement result signals of the displacement sensors according to the designed time interval. The signal receiving device receives the signal transmitted by the signal transmitting device in real time and transmits the signal to the intelligent fault diagnosis system.

The intelligent fault diagnosis system is arranged in an explosion-proof electric cabinet outside the cylinder body of the permanent magnet electric roller.

The explosion-proof performance safety protection device for the permanent magnet electric roller can further comprise other sensing components such as a vibration sensor and the like so as to increase the parameter types of online detection in the system, the signal output ends of various sensors are connected with an intelligent fault diagnosis system, the intelligent fault diagnosis system analyzes and judges the signals, and an alarm is given out or other protection measures are taken when necessary.

The safety protection device for the explosion-proof performance of the permanent magnet electric roller can perform self-check by the following method: the method comprises the steps of measuring an initial value of an explosion-proof gap and recording data when a permanent magnet electric roller does not rotate and is not tensioned by an adhesive tape or is only under a smaller tension state, then tensioning the adhesive tape wrapped on the permanent magnet electric roller to a certain degree by using an adhesive tape tensioning device, measuring the explosion-proof gap data again and calculating the variable quantity of the explosion-proof gap, or directly measuring the variable quantity of the explosion-proof gap, and if the variable quantity of the explosion-proof gap is not zero, considering that the measured explosion-proof gap data are normal and effective, and indicating that the corresponding permanent magnet electric roller can be operated in an electrified mode.

Claims (22)

1. A permanent magnet electric roller explosion-proof performance safety protection device is characterized in that: the intelligent fault diagnosis system comprises a central processing unit, a storage, a communication circuit and an input and output device, wherein the storage, the communication circuit and the input and output device are in bidirectional communication connection with the central processing unit, the central processing unit is further connected with an alarm circuit and a power supply control circuit, the power supply control circuit controls the on-off of a power supply line of the permanent magnet electric roller, and when the permanent magnet electric roller normally works, the intelligent fault diagnosis system receives a measurement result signal from the displacement sensor and instantly compares the measurement result with the measurement result And comparing the initial set ranges of the systems, and when the measurement result of any displacement sensor falls into the initial set range of the systems, sending out an alarm and/or controlling the permanent magnet electric roller to stop by the intelligent fault diagnosis system.

2. The permanent magnet electric roller explosion-proof performance safety protection device of claim 1, characterized in that: the displacement sensor adopts an inductive displacement sensor or a capacitive grating displacement sensor and an infrared distance measuring sensor, when the capacitive grating displacement sensor and the infrared distance measuring sensor are adopted, the capacitive grating displacement sensor is arranged at the flameproof joint surface of the web and the cylinder body and the flameproof joint surface of the web and the bearing inner side end cover, and the infrared distance measuring sensor is arranged at the flameproof joint surface of the web and the shaft.

3. The permanent magnet electric roller explosion-proof performance safety protection device of claim 2, characterized in that: each set of sensor mounting bracket comprises a first bracket and a second bracket which are mutually separated, the first bracket and the second bracket are respectively and fixedly connected with two parts forming an explosion-proof joint surface, the first bracket and the second bracket are not contacted in a mounting state, and when an inductive displacement sensor is adopted, a coil and an armature are respectively and fixedly connected onto the first bracket and the second bracket; when the capacitive grid displacement sensor is adopted, a movable grid and a fixed grid of the capacitive grid displacement sensor are respectively and fixedly connected to the first support and the second support; when the infrared distance measuring sensor is adopted, the infrared transmitting module and the infrared receiving module of the infrared distance measuring sensor are respectively and fixedly connected to the first support and the second support.

4. The permanent magnet electric roller explosion-proof performance safety protection device of claim 2, characterized in that: each capacitive grating displacement sensor comprises two movable gratings and one or two fixed gratings, the two movable gratings are respectively arranged along the axial direction and the radial direction, the two movable gratings share one fixed grating, the fixed grating is arranged between the two movable gratings and positioned at the intersection of the two movable gratings, or the two movable gratings correspond to the two fixed gratings one by one, and the two fixed gratings are arranged between the two movable gratings side by side and positioned at the intersection of the two movable gratings.

5. The permanent magnet electric roller explosion-proof performance safety protection device of claim 1, 2, 3 or 4, characterized in that: the signal transmission device is an explosion-proof cable or a wireless signal transmission device.

6. The permanent magnet electric roller explosion-proof performance safety protection device of claim 1, 2, 3 or 4, characterized in that: the intelligent fault diagnosis system is arranged in an explosion-proof electric cabinet outside the cylinder body of the permanent magnet electric roller.

7. The permanent magnet electric roller explosion-proof performance safety protection device of claim 5, characterized in that: the intelligent fault diagnosis system is arranged in an explosion-proof electric cabinet outside the cylinder body of the permanent magnet electric roller.

8. The permanent magnet electric roller explosion-proof performance safety protection device of claim 1, 2, 3 or 4, characterized in that: one or more pairs of displacement sensors are arranged on the same explosion-proof joint surface, two sets of displacement sensors in each pair of displacement sensors are arranged at intervals of 180 degrees in the circumferential direction, and when the plurality of pairs of displacement sensors are arranged, the displacement sensors in each pair are uniformly arranged along the circumferential direction.

9. The permanent magnet electric roller explosion-proof performance safety protection device of claim 5, characterized in that: one or more pairs of displacement sensors are arranged on the same explosion-proof joint surface, two sets of displacement sensors in each pair of displacement sensors are arranged at intervals of 180 degrees in the circumferential direction, and when the plurality of pairs of displacement sensors are arranged, the displacement sensors in each pair are uniformly arranged along the circumferential direction.

10. The permanent magnet electric roller explosion-proof performance safety protection device of claim 6, characterized in that: one or more pairs of displacement sensors are arranged on the same explosion-proof joint surface, two sets of displacement sensors in each pair of displacement sensors are arranged at intervals of 180 degrees in the circumferential direction, and when the plurality of pairs of displacement sensors are arranged, the displacement sensors in each pair are uniformly arranged along the circumferential direction.

11. The explosion-proof safety protection device for the permanent magnet electric roller of claim 7, characterized in that: one or more pairs of displacement sensors are arranged on the same explosion-proof joint surface, two sets of displacement sensors in each pair of displacement sensors are arranged at intervals of 180 degrees in the circumferential direction, and when the plurality of pairs of displacement sensors are arranged, the displacement sensors in each pair are uniformly arranged along the circumferential direction.

12. An explosion-proof type permanent magnet electric roller is characterized in that: the intelligent fault diagnosis device comprises a cylinder body, a web plate, a shaft, a displacement sensor, a sensor mounting bracket, a signal transmission device and an intelligent fault diagnosis system, wherein a left web plate and a right web plate are respectively rotatably supported on the shaft through a left bearing and a right bearing, the left end and the right end of the cylinder body are respectively fixedly connected with the left web plate and the right web plate, the outer sides of the left web plate and the right web plate are respectively fixedly provided with a left bearing outer end cover and a right bearing outer end cover, the left bearing outer end cover and the right bearing outer end cover are sleeved on the shaft and are rotatably connected with the shaft, a dynamic seal is arranged between the bearing outer end covers and the shaft, the inner sides of the left web plate and the right web plate are respectively fixedly provided with a left bearing inner end cover and a right bearing inner end cover, the left bearing inner end cover and the right bearing inner end cover are respectively used for axial limiting of the outer ring of the left bearing and the right bearing, a cylindrical matching surface, at least one set of displacement sensor is arranged on each flameproof joint face, the displacement sensors are directly arranged on related parts of the permanent magnet electric roller or arranged on related parts of the permanent magnet electric roller by means of the sensor mounting bracket, the signal output ends of all the displacement sensors are connected with the intelligent fault diagnosis system through the signal transmission device, the intelligent fault diagnosis system comprises a central processing unit, a storage device, a communication circuit and an input and output device which are in bidirectional communication connection with the central processing unit, the central processing unit is also connected with an alarm circuit and a power supply control circuit, the power supply control circuit controls the on-off of a power supply circuit of the permanent magnet electric roller, and when the permanent magnet electric roller normally works, the intelligent fault diagnosis system receives a measurement result signal from the displacement sensors and compares the measurement result with a system initial setting range in real time, when the measurement result of any displacement sensor falls into the initial setting range of the system, the intelligent fault diagnosis system gives an alarm and/or controls the permanent magnet electric drum to stop.

13. The flameproof permanent-magnet motorized drum of claim 12, wherein: capacitive grating displacement sensors are arranged on the explosion-proof joint surface of the amplitude plate and the cylinder body and the explosion-proof joint surface of the end cover at the inner side of the bearing, an infrared distance measuring sensor is arranged on the explosion-proof joint surface of the amplitude plate and the shaft, or inductive displacement sensors are arranged on all the explosion-proof joint surfaces.

14. The flameproof permanent-magnet motorized drum of claim 13, wherein: each set of sensor mounting bracket comprises a first bracket and a second bracket which are mutually separated, the first bracket and the second bracket are respectively and fixedly connected with two parts forming an explosion-proof joint surface, the first bracket and the second bracket are not contacted in a mounting state, and when the capacitive grating displacement sensor is arranged, a movable grating and a fixed grating of the capacitive grating displacement sensor are respectively and fixedly connected on the first bracket and the second bracket; when the infrared distance measuring sensor is arranged, an infrared transmitting module and an infrared receiving module of the infrared distance measuring sensor are respectively and fixedly connected to the first support and the second support; when the inductive displacement sensor is adopted, the coil and the armature are respectively and fixedly connected to the first support and the second support.

15. The flameproof permanent-magnet motorized drum of claim 13, wherein: two movable grids and one or two fixed grids are arranged at the position where the capacitive grid displacement sensors are arranged one by one, the two movable grids are respectively arranged along the axial direction and the radial direction, the two movable grids share one fixed grid, the fixed grid is arranged between the two movable grids and is positioned at the intersection of the two movable grids, or the two movable grids are in one-to-one correspondence with the two fixed grids, and the two fixed grids are arranged between the two movable grids side by side and are positioned at the intersection of the two movable grids.

16. An explosion-proof permanent magnet motorized drum, according to claim 12, 13, 14 or 15, characterized in that: an independent explosion-proof electric cabinet is arranged outside the cylinder body, and the intelligent fault diagnosis system is arranged in the explosion-proof electric cabinet.

17. The flameproof permanent-magnet motorized drum of claim 13, 14 or 15, characterized in that: the signal transmission device is an explosion-proof cable or a wireless signal transmission device.

18. The flameproof permanent-magnet motorized drum of claim 16, wherein: the signal transmission device is an explosion-proof cable or a wireless signal transmission device.

19. The flameproof permanent-magnet motorized drum of claim 13, 14 or 15, characterized in that: one or more pairs of displacement sensors are arranged on the same explosion-proof joint surface, two sets of displacement sensors in each pair of displacement sensors are arranged at intervals of 180 degrees in the circumferential direction, and when the plurality of pairs of displacement sensors are arranged, the displacement sensors in each pair are uniformly arranged along the circumferential direction.

20. The flameproof permanent-magnet motorized drum of claim 16, wherein: one or more pairs of displacement sensors are arranged on the same explosion-proof joint surface, two sets of displacement sensors in each pair of displacement sensors are arranged at intervals of 180 degrees in the circumferential direction, and when the plurality of pairs of displacement sensors are arranged, the displacement sensors in each pair are uniformly arranged along the circumferential direction.

21. The flameproof permanent-magnet motorized drum of claim 17, wherein: one or more pairs of displacement sensors are arranged on the same explosion-proof joint surface, two sets of displacement sensors in each pair of displacement sensors are arranged at intervals of 180 degrees in the circumferential direction, and when the plurality of pairs of displacement sensors are arranged, the displacement sensors in each pair are uniformly arranged along the circumferential direction.

22. The flameproof permanent-magnet motorized drum of claim 18, wherein: one or more pairs of displacement sensors are arranged on the same explosion-proof joint surface, two sets of displacement sensors in each pair of displacement sensors are arranged at intervals of 180 degrees in the circumferential direction, and when the plurality of pairs of displacement sensors are arranged, the displacement sensors in each pair are uniformly arranged along the circumferential direction.

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