105results about How to "Avoid failure rate" patented technology

The invention belongs to the technical field of intelligent construction site management, and discloses a video image based intelligent construction site regional management and intrusion detection method and system. The method includes: automatically recognizing an area divided by placement markers in a monitoring area based on a video monitoring image, adopting a mixed Gaussian model to model avideo image background, and extracting a foreground image containing a moving object; performing median filtering and morphological preprocessing on the foreground image, extracting connected domain features and LBP texture features of the moving object, and adopting the two-level tracking strategy; performing intrusion detection on each extracted moving object and the region detected in the image; sending a sound and light alarm signal according to a regional management specification for a detected illegal intrusion event. The tracking of the moving target adopts the two-level tracking strategy of the connected domain block features and the LBP features, thus ensuring the real-time property and the accuracy of the target tracking.

The invention discloses an air conditioning system and a communication method of the air conditioning system. The air conditioning system comprises an indoor unit and an outdoor unit. The indoor unit comprises a first wireless communication module. The outdoor unit comprises a second wireless communication module. The second wireless communication module is in communication with the first wireless communication module. One of the indoor unit and the outdoor unit is a host. The other one of the indoor unit and the outdoor unit is a slave. The host and the slave complete handshake through one of at least one shared channel. One of multiple work channels is selected by the host to be used as the work channel between the host and the slave, the work channel is transmitted to the slave from one of the shared channel, and therefore the host and the slave conduct communication through the selected work channel. By the adoption of the air conditioning system and a communication method of the air conditioning system, wireless communication between the indoor unit and the outdoor unit of the air conditioner is achieved, the problems that when wire communication is adopted, efficiency is low, the fault rate is high, and energy is wasted are solved, and the problem of channel disturbance caused during wireless communication is also solved.

The present invention is shot and sand blasting system and method for cleaning residual carbon electrode from electrolyzing aluminum. The cleaning system includes one shot and sand blasting chamber as sealed space for shot and sand blasting operation for processing the surface of residual carbon electrode from electrolyzing aluminum to eliminate impurity and recover carbon; one piece of shot and sand blasting equipment including one automatic continuous shot and sand blasting device and one automatic shot and sand blasting mechanism with spraying guns; and one shot and sand recovering device. The present invention is favorable to recovering carbon for reuse.

The invention discloses a power equipment fault probability prediction method considering insulation defect categories and fault relevance. The method comprises the following steps: (1) collecting PRPS map data of power equipment and preprocessing the PRPS map data; (2) extracting partial discharge characteristics based on the pre-processed PRPS atlas data; (3) inputting the partial discharge characteristics into a trained convolutional neural network, and outputting a probability value P (Dk) that the power equipment has a certain type of insulation defects through the trained convolutional neural network; inputting the partial discharge characteristics into a trained long-short-term memory neural network, and enabling the trained long-short-term memory neural network to output the faultprobability P (F | Dk) of the power equipment under the condition of Dk; and (4) obtaining the final fault probability P (F) of the power equipment based on the following formula. In addition, the invention also discloses a power equipment fault probability prediction system.

The invention relates to an analysis method and a management method for circuit breaker dynamic load capacity. The analysis method comprises the following steps: a threshold value pre-setting step; and judgment steps including a real-time judgment step, an accumulation judgment step and an electrical endurance judgment step. By adopting at least one of the judgment steps, a circuit breaker dynamic load real-time data evaluation result, a circuit breaker dynamic load cumulative data evaluation result and a circuit breaker dynamic load possible electrical endurance evaluation result are synthesized to obtain a circuit breaker dynamic load evaluation result to be output. Through conducting real-time analysis and evaluation according to property and magnitude of a main loop current of a circuit breaker, the margin of the circuit breaker in withstanding various types of current, the load which can be increased to the circuit breaker and the possible failure that the circuit breaker can tolerate are determined, thereby providing basic support for the management of the circuit breaker, being capable of avoiding failure rate, prolonging failure-free operation time of the circuit breaker and prolonging the service life of the circuit breaker.

The invention relates to the field of brake of wind generating sets, in particular to a wind generating set, and a yawing brake device, a brake system and a brake method for the wind generating set. The yawing brake device comprises a brake disc, a friction plate and a pushing component. After the wind generator set is mounted on a wind generating set base, the surface of the brake disc is parallel to the wind generating set base. The friction end of the brake disc is in contact with the friction surface of the friction plate. A pushing end of the pushing component is propped against the pushing surface of the friction plate. The friction plate is perpendicular to the wind generating set base. Powder generated after the friction plate is in friction with the brake disc can fall automatically under the action of gravity, powder accumulated on the friction plate does not need to be removed manually, the problems of friction coefficient variation, the yawing vibration and the yawing abnormal sound between the friction plate and the brake disc can be avoided, and normal brake of the friction plate and the brake disc is not interfered.

The invention discloses a three-layer solid wood composite electric heating floor and a manufacturing method thereof. The three-layer solid wood composite electric heating floor comprises a decoration wood veneer, an upper insulation layer, an electric heating chip, a lower insulation layer and a three-layer solid wood base material layer. The three-layer solid wood base material layer is formed by laminating an upper wood veneer, a lower wood veneer and a solid wood batten base material layer clamped between the upper wood veneer and the lower wood veneer. The decoration wood veneer, the upper insulation layer, the electric heating chip, the lower insulation layer and the three-layer solid wood base material layer are sequentially overlapped and laid from top to bottom and laminated into the complete floor. The lower surface of the decoration wood veneer is coated with insulation resin glue to form the upper insulation layer and is attached to the upper surface of the electric heating chip. The upper surface of the three-layer solid wood base material layer is coated with insulation resin glue to form the lower insulation layer and is attached to the lower surface of the electric heating chip. The electric heating chip is formed by coating the surface of a copper strip used as a power plug with conductive hot melt glue and laying the copper strip on the surface of carbon fiber electric heating non-woven paper. According to the three-layer solid wood composite electric heating floor, the amount of adopted glue is small, the deformation degree is low, and the floor is more environmentally friendly. The electric heating chip and the copper strip are connected firmly, safety is good, and the service life is long.

The invention discloses a service composition method based on reliability prediction combined with QoS. The service composition method includes the steps that according to QoS constraint of users, local selection is carried out on services, the global QoS constraint is divided into local constraint, then local optimal entity services are selected in each service assembly, and finally predication is carried out on reliability of the services with optimal QoS attributes and the predication result is used as a decisive factor for selection of a final combination scheme. According to the service composition method, the current QoS satisfaction conditions of the services are considered, the reliability change conditions within a period of time in the future are also considered, then the weightiness relationship between the current QoS satisfaction conditions and the reliability change conditions can be determined according to user preference, so that the compromise of the selected services is achieved between the current QoS constraint and future reliability, and an efficient and reliable system can be obtained.

The invention discloses a comprehensive depth peak load regulation system for a power plant and a peak load regulation method. The comprehensive depth peak load regulation system comprises heating equipment and an absorption chiller. The heating equipment is used for being connected with a substation and capable of generating hot water through electricity and delivering the hot water into a heat supply pipe network. The heating equipment comprises solid heat storage equipment. The absorption chiller is connected with the heating equipment and used for converting heat generated by the heating equipment into cold energy and delivering the cold energy into a cooling pipe network. By the adoption of the comprehensive depth peak load regulation system for the power plant and the peak load regulation method, the purposes that heat is provided in winter, the cold energy is provided in summer, and stored energy can be used for power generation during non-heating or non-cooling seasons can be achieved, the year-round depth peak load regulation is achieved, the equipment utilization rate is increased greatly, the peak load regulation effect is improved greatly, and the good economic benefitscan be achieved by using the difference in electricity charges of the peak-valley power.

The invention provides an industrial sewing machine operating panel with the voice prompt function. The industrial sewing machine operating panel comprises an MCU, an indicating unit, a display unit, an electric control connecting interface, a voice processing module and a loudspeaker, wherein the indicating unit, the display unit, the electric control connecting interface, the voice processing module and the loudspeaker are connected with the MCU, the electric control connecting interface is an interface connected with a motor controller of a control system, and the MCU is further provided with a keyboard interface for being connected with a keyboard. The industrial sewing machine operating panel with the voice prompt function can timely give out an alarm when an operator presses wrong keys, and therefore the phenomenon that a fault occurs to the industrial sewing machine because of error operation on the keyboard can be avoided; besides, when the fault occurs, received fault codes can be read by the MCU to find the corresponding fault and the corresponding solution through the voice processing module, and the fault and the solution are broadcast through the loudspeaker, and therefore a maintenance person only needs to maintain the fault according to the broadcast content, and maintenance difficulty of the industrial sewing machine is greatly reduced.

The invention belongs to the technical field of heat pumps, and particularly relates to a heat pump system with heating and defrosting functions. The heat pump system comprises a compressor, a four-way valve, a first heat exchanger, a throttling device and a second heat exchanger which communicate with one another through a refrigerant circulation pipeline. The heat pump system is characterized byfurther comprising a working medium heater used for heating a refrigerant; and the working medium heater is connected in series between the throttling device and the first heat exchanger or the second heat exchanger. The heat pump system provided by the invention has the beneficial effects that the working medium heater is connected in series between the throttling device and one indoor heat exchanger, so that the throttled low-temperature refrigerant can be heated, the temperature of the heated refrigerant can approach the indoor environment temperature, and the indoor heat exchange can be protected against the fogging phenomenon caused by excessive temperature differentials; and furthermore, the problems that the defrosting time is hugely long, the defrosting process is not thorough, aswell as the unit failure rate and repair rate are high can be solved.

The invention provides a solid-powder dissolving and adding device. The solid-powder dissolving and adding device solves the technical problems that as for an existing solid-powder dissolving and adding device, dissolving efficiency is low, dissolving is incomplete, the concentration of dissolving liquid is instable, the fault rate is high, and safety is poor. The solid-powder dissolving and adding device comprises a dissolving tank. A tank cover is arranged on the dissolving tank. A grate is arranged inside the dissolving tank. The diameter of the grate is the same as the inner diameter of the dissolving tank. The grate is provided with holes and nozzles. A water inlet pipe is connected to the portion, corresponding to the grate, of the dissolving tank, communicated with the nozzles and further provided with a water inlet valve. A liquid outlet is formed in the bottom of the dissolving tank and connected with a liquid outlet pipe, and a liquid outlet valve is arranged on the liquid outlet pipe. The solid-powder dissolving and adding device can be widely applied to dissolving and adding of solid.

The invention discloses an open-type three-jaw self-centering rotation device. The device comprises a self-centering clamping disc portion and a self-centering rotation portion which are assembled together. The self-centering clamping disc portion is used for clamping workpieces. The self-centering rotation portion drives the workpieces to conduct rotation machining. The open-type self-centering clamping disc is adopted, so that the open-type three-jaw self-centering rotation device is particularly suitable for automatic bottoming welding of flanges and connecting pipes with the flanges on the two edges, and the workpieces can be directly lifted away along an opening of the clamping disc after welding is completed. The open-type three-jaw self-centering rotation device is quite suitable for automatic welding, hole forming, cutting and the like of some long circular workpieces, the working mode that long workpieces must be inserted into one end of rotation clamping disc equipment with a central through hole during operation is avoided, the long workpieces can be directly placed on the open-type three-jaw self-centering rotation device from bottom to top by the adoption of the open-type three-jaw self-centering rotation device, unnecessary man-hour waste can be reduced, the working efficiency of the open-type three-jaw self-centering rotation device is improved, and the overall length of the open-type three-jaw self-centering rotation device is decreased.

The invention relates to an in-place sensing device for a workpiece in a furnace. The in-place sensing device comprises a detecting stick, the inside of the furnace is communicated with the outside of the furnace via the detecting stick, a groove-shaped detecting plate is disposed on the detecting stick and positioned inside the furnace, two fixing plates are disposed at the end, which is positioned on the outside of the furnace, of the detecting stick, a travel switch is arranged on lateral edges of the fixing plates, a roller is arranged between the two fixing plates and is in rolling connection with one end of a detecting shaft disposed on a side surface of the roller, a cam type limiting plate capable of impacting the travel switch is arranged at the other end of the detecting shaft, and a return spring connected with the cam type limiting plate is arranged on the rear of the cam type limiting plate. The in-place sensing device for the workpiece inside the furnace has the advantages that the in-place sensing device is simple in structure, impact force on the travel switch is greatly reduced, an excellent protection effect for control of an integral system and service of the travel switch is realized, frequent failure is effectively prevented, maintenance cost is lowered, and production efficiency is improved.

The invention discloses an integral sludge incineration system for a circulating fluidized bed, which includes an incinerator, a separator, a pneumatic distribution valve, a drying machine, a fine ashseparator, a condenser, a steam and water separator, a first blower, a tail heating surface, a dust remover, an induced draft fan and a chimney, wherein the upper part of the incinerator is connectedwith the separator and the tail heating surface respectively; the lower part of the separator is connected with the incinerator and the drying machine respectively through the pneumatic distributionvalve; dried sludge in the incinerator sequentially passes by the fine ash separator, the condenser and the steam and water separator, and then is conveyed into the incinerator under the action of thefirst blower; the tail heating surface is connected with the drying machine through circulating conduction oil, and high temperature flue gas inside the tail heating surface passes by the dust remover, and then is discharged from the chimney under the action of the induced draft fan. According to the invention, sludge drying and incineration are organically integrated, so that consumption of auxiliary fuel during sludge incineration is greatly reduced, and the drying and incineration technology is greatly simplified; and the system has the characteristics of simple operation, wide adjusting range, good control performance, low production cost, and the like.

An automatic multidimensional gas phase chromatography system is featured as switching mixture sample from precolumn to analysing column by controlling pressure difference between axiliary pressures based on pressure balance principle to have overcome defect of valve leakage and block in normal system. A method utilizing the system to analyse mixture is also disclosed.

The invention relates to a control method of a moving trolley of a submerged-arc welding machine, a control device of the moving trolley and the submerged-arc welding machine. The control method comprises the following steps of setting preset operating parameters of a moving trolley of the submerged-arc welding machine, when the moving trolley of the submerged-arc welding machine operates according to the preset operating parameters, collecting feedback operation parameters of the moving trolley of the submerged-arc welding machine, performing PID operation on the preset operation parameters and the feedback operation parameters to adjust the preset operation parameters of the movable trolley of the submerged arc welding machine, so that the moving trolley of the submerged-arc welding machine is operated according to the adjusted preset operating parameters. According to the control method disclosed by the embodiment of the method, automatic PID adjustment can be carried out on the running state of the moving trolley of the submerged-arc welding machine, so that the running state of the submerged arc welding machine moving trolley is matched with the welding speed, the welding precision and the welding quality are improved, the operation state of the submerged-arc welding machine moving trolley has high-precision and automatic control functions, and great convenience is broughtto the operation process of technicians.

The invention provides a multistage screening system applied to a crusher. The multistage screening system applied to the crusher comprises motors, a screening box, spiral conveying devices, a screening cleaning belt, screens and screening barrels; the multistage screening system is characterized in that the spiral conveying devices are horizontally placed in the screening box, a center shaft of the screening box is connected to a driving shaft, a belt wheel sleeves the driving shaft, and the belt wheel is connected to the motors; and the screens comprises a fine screen, a middle screen and acoarse screen, the fine screen, the middle screen and the coarse screen are sequentially arranged in the screening barrels along the advancing direction of the material, a middle material outlet and acoarse material outlet are sequentially formed in the bottom of the screening barrels corresponding to the fine screen, the middle screen and the coarse screen. According to the multistage screeningsystem applied to the crusher, the spiral conveying devices are used for grinding and conveying the materials through continuous rotation, so that the grading treatment of the materials is realized; and meanwhile, the device is easy to assemble, and the assembling strength of technicians is not increased.

The invention provides a lithium ion battery photo frame filled with a phase change material. The photo frame comprises a photo frame body forming a photo frame module; a battery cell cavity for arranging a battery cell and a phase-change material filling cavity for filling the phase-change material are arranged in the photo frame body; the phase-change material filling cavity is arranged outsidethe battery cell cavity in a surrounding manner to cool the battery cell in the battery cell cavity; the phase-change material filling cavity is provided with an exhaust hole which is communicated with the outside and is used for balancing internal and external pressure, an acting surface, welded to a battery cell tab, of the photo frame body is arranged in an opening manner, and an aluminum sheetis arranged between the phase-change material filling cavity and the battery cell cavity of a symmetric acting surface with the maximum area of the photo frame body. According to the invention, the space of the battery and the whole vehicle is saved, the thermal resistance in the heat conduction process can be reduced, the consistency of the temperature of the battery is effectively improved, thesystem temperature difference is reduced, the thermal management performance is improved, the service life of the battery is prolonged, the battery electric quantity is saved, and safety and reliability are realized.

The invention provides an automatic draining device of a gas extraction system. The automatic draining device comprises a water collecting box, a piston switch device, a first one-way valve and a second one-way valve, wherein the water collecting box is provided with a first connector, a second connector, a water inlet and a water outlet; the piston switch device is arranged in the water collecting box and comprises a piston cylinder body, a piston rod and a floating ball; a cavity body is formed in the piston cylinder body; the piston cylinder body is provided with a first opening, a second opening, a third opening and a fourth opening; the first opening is connected with the first connector; the second opening is connected with the second connector; a first blocking part and a second blocking part are arranged at one end of the piston rod; and the floating ball is arranged on the piston rod. According to the automatic draining device of the gas extraction system, the defects of low sensitivity and high fault rate caused by a great number of mechanical transmission parts are avoided and the draining effect is improved.

The invention discloses a PLC control system for a rubber-insulated wire optical cable cutter and belongs to the technical field of coiling and uncoiling of the rubber-insulated wire optical cables. An uncoiling mechanism comprises an uncoiling tray, a motor for driving the uncoiling tray to ascend and descend and a frequency converter for driving the motor; a rotating shaft of a tension pulley in a wire storage tensioning device is in driving connection with a tensioning potentiometer through a transmission mechanism; a signal output end of the tensioning potentiometer is connected with a control input end of the uncoiling frequency converter; a signal output end of a proximity switch in a metering device is connected with a signal input end of a metering instrument; a coiling mechanism comprises a coiling motor, a coiling frequency converter, two coiling trays and two electromagnetic clutches in driving connection with the coiling motor; the coiling frequency converter is in controlling connection with the coiling motor; the signal output ends of the uncoiling mechanism, the wire storage tensioning device, the metering device and the coiling mechanism are connected with PLC; the control output end of the PLC is connected with the uncoiling mechanism, the wire storage tensioning device, the metering device and the coiling mechanism. The system can increase the production efficiency and reduce the failure rate of the single-tray coiling / uncoiling device.

The invention discloses a synchronization device for long air discharge observation. The synchronization device comprises an oscilloscope, an electro-optical conversion module, a first photoelectric conversion module, a second photoelectric conversion module, a current measuring module and a high-speed camera. The oscilloscope measures a to-be-tested voltage, outputs a trigger electrical signal according to a preset trigger level, and records transmission time of the trigger electrical signal. The electro-optical conversion module receives the trigger electrical signal outputted by the oscilloscope and converts the trigger electrical signal into a trigger optical signal. The first photoelectric conversion module and the second photoelectric conversion module receive the trigger optical signal, convert the trigger optical signal into a trigger electrical signal and trigger the current measuring module and the high-speed camera respectively. With the provided synchronization detecting device, high-precision synchronous measurement of the voltage, current and image of long air discharging can be realized; the test arrangement is simplified; and the test cost is saved.

The invention discloses a fan device. The fan device comprises fan blades, a rotary shaft and an insert, wherein knurls are formed in one end of the rotary shaft, the end of the rotary shaft is sleeved with the fan blades, the rotary shaft is sleeved with the insert, and the insert is inlaid in the fan blades. A machining method for the fan device comprises the following steps: (1) fixing one end of the rotary shaft and the insert in an injection mold after knurling the end of the rotary shaft; and (2) carrying out injection molding in the injection mold to obtain the fan blades through injection molding forming. Because one end of the rotary shaft and the insert are fixed in the injection mold, the perpendicularity between the rotary shaft and the insert can be revised through positioning of the mold; then the fan blades are obtained by carrying out injection molding forming in the injection mold so that the insert can be inlaid in the fan blades, it is guaranteed that one end of the rotary shaft is tightly fixed to the fan blades, and good concentricity is achieved; it is guaranteed that when the rotary shaft drives the fan blades to rotate, the stability is high, noise is reduced, and the service life is prolonged; and the manufacturing process is simple, the workload of a producer is reduced, and compared with the prior art, the materials of a machine case is saved, and the cost is reduced.

The invention provides a pencil sharpener frame, and belongs to the technical field of machines. According to the pencil sharpener frame, the problem that an existing pencil sharpener frame is not suitable for a ceramic blade is solved. The frame comprises a frame body and a blade, wherein the blade is in a long sheet shape, and one side of the blade is provided with a cutting edge; a pen placingchannel is formed in the frame body, the blade is arranged in the axial direction of the pen placing channel, and the cutting edge of the blade is located in the pen placing channel; the blade is madeof a ceramic material, and a first positioning groove and a second positioning groove are formed in the frame body; and the first positioning groove and the second positioning groove are oppositely arranged, one end of the blade is inserted into the first positioning groove, and the other end of the blade is inserted into the second positioning groove. According to the pencil sharpener frame, theadvantages that the frame is applicable to the ceramic blade, and the blade is not prone to brittle fracture are achieved.

The invention discloses a water-free cooling energy-saving and environmentally-friendly high-power rectification system, which belongs to the technical field of transformer equipment cooling, and comprises a transformer forced oil circulation cooling main system and a rectification internal circulation cooling subsystem, wherein the transformer forced oil circulation cooling main system comprisesa transformer body, a forced oil circulation cooler, a forced oil cooling circulation pump, a forced oil inlet pipe and a forced oil outlet pipe; and a cooling radiator is arranged in the transformerbody and radiates heat of the rectification internal circulation cooling subsystem into oil of the transformer body, and the oil in the transformer body is cooled by means of the transformer forced oil circulation cooling main system. The water-free cooling energy-saving and environmentally-friendly high-power rectification system achieves the effect of fluid double alternating cooling by adoptingthe rectification internal circulation cooling subsystem and the transformer forced oil circulation cooling main system, occupies small space, is small in size, saves energy, is environmentally friendly, eliminates the influence of water scale, reduces the auxiliary power consumption, eliminates water cooling in the rectifier portion, can reduce the failure rate, and makes the whole machine saferand more reliable in operation.

The invention discloses a cooking utensil convenient for uncapping. The cooking utensil comprises a pot body, a pot cover and a liner contained in the pot body; one side of the pot cover is hinged tothe pot body and the other side is buckled with the pot body through a buckle; a cooking chamber is formed by the pot cover in the close state with the liner; the pot cover or the pot body are provided with a vacuum pump; the vacuum pump is used for extracting air inside the cooking chamber to form negative pressure in the cooking chamber; the pot cover is also provided with an inlet valve and a cover opening button; the inlet valve is connected to the cooking chamber and is at the close state when the cooking chamber is at the negative pressure state; the inlet valve is opened when the coveropening button is pressed to a first position; the buckle is opened when the cover opening button is pressed to a second position. The start function of the inlet valve and the cover opening functionof the pot cover are integrated in one cover opening button; through pressing the cover opening button, the air inlet of the cooking chamber and the cover opening of the electric rice cooker can be achieved, which is convenient for user.

The invention relates to a motor train unit axle residual life prediction method based on ResNet and GRU, and discloses a motor train unit axle residual life prediction method based on ResNet and GRU,and the method comprises the steps: preprocessing vibration data of a collected bogie axle of a high-speed motor train unit by ResNet, extracting features of the axle vibration data by GRU, simulating an axle performance degradation trend, and achieving life prediction of an axle. The change rule of the axle life trend is explored by utilizing the characteristic that a memory unit of a GRU network has long-term and short-term memory on time series data, and an axle life prediction model is established, so that the phenomenon of insufficient or excessive maintenance in planned and preventive maintenance due to incapability of accurately estimating the residual life of the bogie axle in the past is avoided, and the maintenance efficiency is improved. Maintenance cost and the failure rate are reduced.

The invention discloses a polyethylene entwining structure pipe wall bell and spigot trimming device. The polyethylene entwining structure pipe wall bell and spigot trimming device comprises a bearingbed body. The top of the bearing bed body is provided with first fixed straight bars. The tops of the first fixed straight bars are provided with fixed blocks. The side faces of the fixed blocks areprovided with first air cylinders. The ends of the first air cylinders are provided with limiting blocks. Rotary rollers are arranged between the first fixed straight bars. The outer side of one end of each rotary roller is provided with a limiting ring. One side of the rotary rollers is provided with a sliding table. The top of the sliding table is provided with an antiskid layer. The side facesof the first fixed straight bars are provided with first motors. One side of each first motor is provided with a second air cylinder. Through arrangement of grinding rollers and grinding plates, the trimming device can conduct trim the inner side and the outer side of a bell and spigot through the grinding rollers and the grinding plates by replacing traditional manual trimming to achieve the labor-saving effect. Meanwhile, the polyethylene entwining structure pipe wall bell and spigot trimming device can make the trimming effect better, improve the product quality, reduce the unqualified rateof products and avoid unnecessary economic losses.

The invention relates to an analysis method and a management method for circuit breaker dynamic load capacity. The analysis method comprises the following steps: a threshold value pre-setting step; and judgment steps including a real-time judgment step, an accumulation judgment step and an electrical endurance judgment step. By adopting at least one of the judgment steps, a circuit breaker dynamic load real-time data evaluation result, a circuit breaker dynamic load cumulative data evaluation result and a circuit breaker dynamic load possible electrical endurance evaluation result are synthesized to obtain a circuit breaker dynamic load evaluation result to be output. Through conducting real-time analysis and evaluation according to property and magnitude of a main loop current of a circuit breaker, the margin of the circuit breaker in withstanding various types of current, the load which can be increased to the circuit breaker and the possible failure that the circuit breaker can tolerate are determined, thereby providing basic support for the management of the circuit breaker, being capable of avoiding failure rate, prolonging failure-free operation time of the circuit breaker and prolonging the service life of the circuit breaker.