69results about How to "Solve frequent replacement" patented technology

The invention provides a multi-vehicle mixed line conveying system. The multi-vehicle mixed line conveying system comprises a machining conveying track, a switching conveying track, a storage conveying track, a clamp trolley, trailer wagons and a rotary switching mechanism, wherein the machining conveying track and the storage conveying track are connected through the switching conveying track; the rotary switching mechanism is arranged in the connection position of the machining conveying track and the storage conveying track; each conveying track comprises a sliding rail; at least one of the machining conveying track, the switching conveying track and the storage conveying track is provided with the clamp trolley; the trailer wagons are arranged on the conveying tracks and can drive the clamp trolley to slide on the sliding rails; rotary switching of the clamp trolley among the conveying tracks is achieved through the rotary switching mechanism. The conveying system can achieve multi-vehicle mixed line flexible production in the conveying process of second-level assembly sending bin, front and back bottom boards and left and right side walls in the welding field of vehicles according to the technological requirements, the vehicle machining cost is reduced, the conveying system can be popularized to logistics conveying of other fields, and the market prospects are wide.

The invention aims at overcoming the defect of a guiding and anti-swinging device of the existing lifting appliance, and provides a lifting appliance with reliable anti-swinging function and convenience for maintenance. The lifting appliance comprises a container lifting mechanism with a balance anti-swinging function, and solves the problem of nonuniform stress of eight steel wire ropes in the prior art. For realizing the purpose, the invention provides the container lifting mechanism with the balance anti-swinging function. The container lifting mechanism comprises a balance damping mechanism, an upper lifting frame, a balance hydro-cylinder, a winding engine, steel wires, a direction-changing pulley, a crane carriage frame, carriage road wheels, a control chamber and a container spreader.

The invention discloses a method for configuring a wireless network. According to the method, private network cells are set in an express way region, and the private network cells are covered by a dedicated frequency point region; a neighbouring region relationship is configured for the private network cells and public network cells in the site region of an express way; the neighbouring region relationship between the private network cells and the public network cells is not configured in an express way region without an intersection. According to the method, the defects of frequent cell replacement, low access success rate and conversation quality declining of high-speed mobile terminal equipment in the existing network are solved. By virtue of the method, the replacement frequency of the equipment among the different cells can be reduced, the switching and reselection paths of the equipment in case of high-speed movement are ensured well, and the communication quality is improved. The applications of a radio resource management algorithm, a switching and reselection policy and network parameter values dedicated to high-speed scenes are promoted, thus the quality of the whole network is improved better.

The invention discloses a return filter and a method of filtering fluid by using the return filter. The return filter comprises a filter cover, a filter head and a filter cartridge, wherein the filter head is arranged between the filter cover and the filter cartridge; an unframed filter element is arranged below the inner wall of the filter cartridge; a bypass valve is arranged at the upper end of the unframed filter element; a magnetic bar is arranged in the centers of the bypass valve and the unframed filter element. When the return filter is used, the fluid enters the filter head from an opening of the filter head, and enters an inner cavity of the unframed filter element by downwards flowing along an inner hole of the bypass valve; most metal particles in the fluid are absorbed by the magnetic bar, and a first level of purification of the fluid is completed; the fluid is filtered by the unframed filter element, and finally passes through holes in the filter cartridge to enter a container. The return filter and the method of filtering the fluid by using the return filter have the beneficial effects that the structural design is ingenious, the economic efficiency is improved, and the environment protection is reinforced; when the filter element is replaced and the fluid passes by the bypass valve, contaminants which are intercepted in the filter element cannot reflow to the container, and the service life of equipment is prolonged.

The invention relates to a prediction technology of a leakage rate of an existing contact mechanical seal. By utilizing a seal interface topography evolvement rule in the wear process of a movable ring and a stationary ring, and a contact compression stress variation rule of primary and secondary seal interfaces due to the wear-down of the movable ring and the stationary ring and the stress relaxation of an O-shaped ring, the topography parameters of the seal interfaces and loads on the movable ring and the stationary ring seal interfaces, the O-shaped ring and the internal diameter and external diameter contact interfaces of the O-shaped ring are determined after the mechanical seal runs for a certain time, and the characteristic sizes of percolation channels between the movable ring and the stationary ring seal interfaces and the O-shaped ring and the internal diameter and external diameter contact interfaces of the O-shaped ring are obtained by a percolation theory, a contact mechanics theory and a fractal theory at the moment, the effect of surface tension and centrifugal force of the sealed medium is considered, and then the leakage state of the existing contact mechanical seal is predicated by a Navier-Stokes equation. The method is simple and practical, the accident problems caused by frequent replacement or expiration of the mechanical seal can be effectively solved, and the safety and reliability of equipment are improved.

The invention belongs to the technical field of an automatic test and relates to an automatic test method for a set top box mainboard. The automatic test method comprises the following steps of firstly, assembling parts of a test device according to an electrical structure principle and a connecting relationship, and writing chip program into a main control chip; pre-setting buttons and time intervals needed for test steps by utilizing a remote controller according to universal test standards of the set top box mainboard, and storing the information in the presetting step into a storage chip; starting the test device under a test mode state after plugging in the components of the set top box mainboard, and opening the starting button so as to send a preset test signal to the set top box mainboard by the test device to realize testing of a corresponding function according to preset buttons and time interval. The method disclosed by the invention has very good universal performance, can be suitable for testing set top box mainboards with various models, is high in automation level, good in universality, high in test efficiency, short in test time, and strong in compatibility; the related device is simple in structure, scientific in design, reliable in principle, simple and convenient to operate.

The invention provides an integrated filtering water-purifying system based on a modularized separating component and belongs to the technical field of water purification. The system comprises a conveying part, a filtering water purifier, an online monitoring part and a PLC control part and is characterized in that the filtering water purifier, the online monitoring part and the PLC control part are connected into a normal running loop and a filtering water-purifying module regenerating loop through the conveying part; the separating component formed by various modularized parts is arranged in the filtering water purifier. According to the integrated filtering water-purifying system based on the modularized separating component, the water purifying modules with different filtering water-purifying features are assembled in one filtering water purifier through the modularizing treatment for the separating component, so that the miniaturization of multilayer filtering water-purifying function is realized and the problems of single property, insufficient water quality adaptability, frequency and inconvenience in exchanging filtering water-purifying material, and the like, of the single filtering water-purifying material are solved.

The invention discloses a workbench structure for powder-spraying an automobile wheel and a powder-spraying method, and relates to the field of automobile assembly. According to the workbench structure and the method, a support piece structure is arranged between the installation surface of the automobile wheel and a tray, then a powder-spraying operation is performed, and finally, powder is blown on the installation surface by an air-blowing device with an air output adjusting function from bolt holes in the automobile wheel. Therefore, the installation surface is protected, and the powder cannot be accumulated on the tray; and moreover, the tray is universal for wheels with different diameters, so that unnecessary actions of replacing the tray, scraping the installation surface powder and the like are avoided, and a great amount of money for buying equipment is saved, thus saving the manpower and material resources.

The invention discloses a submerged arc surfacing manufacturing technology of a looper roll for a rolling mill. The technology specifically comprises the following steps that rough machining is carried out on a base material, the outer diameter of the machined base material is smaller than the size of a finished product by 6 mm, a DF-524A welding wire made of hard materials is adopted, HJ107 flux is selected and matched, surfacing is carried out on the base material through an inversion type direct current welding machine, and the outer diameter of the machined base material is larger than the outer diameter of the finished product by 3-5 mm; post-thermal treatment is carried out on the base material, the machined base material is kept for three hours under the condition of 600 DEG C, then cooling is carried out along with a furnace, the temperature of the furnace is reduced to 300 DEG C, then air cooling is carried out, a surfacing product is obtained, and after finish machining is carried out on the surfacing product according to an art work sheet to obtain the specific specification, the looper roll for the rolling mill is obtained. The looper roll has the advantages of being resistant to abrasion, long in service life and the like.

The invention belongs to the technical field of grinding cleaning equipment, and particularly relates to an automobile rail grinding assembly line. The assembly line comprises a lathe bed and a worktable arranged on the lathe bed; multiple workpiece compressing devices for compressing workpieces to be ground are arranged on a linear guide rail, a full-automatic grinding mechanical hand is arranged on the side edge of the work area of the worktable, the mechanical hand comprises a mechanical arm and a grinding device arranged on the mechanical arm, the grinding device comprises a grinding frame, an abrasive belt feeding wheel, an abrasive belt recycling wheel and a grinding assembly are arranged on the grinding frame, an abrasive belt is sequentially wound on the abrasive belt feeding wheel, the grinding assembly and the abrasive belt recycling wheel, and the abrasive belt recycling wheel is driven by a motor to recycle the abrasive belt. The assembly line is reasonable in structural design, full-automatic control is achieved, the tedious process of manual grinding is completely replaced, through intermittent rotating arrangement of the abrasive belt, the problems that the grinding effect is not stable, and replacement is frequent are solved, and the beneficial effects of being simple in structure, convenient and practical are achieved.

The invention relates to a method for improving the raising effect of arma chinensis by adding substitute host plants. According to the method, pea seedlings or broad bean seedlings are adopted as thehost plants for raising arma chinensis. The method comprises the following steps that the host plants are added into a raising space, and the arma chinensis is inoculated. In the method, host plants(such as poplar or elm branches and leaves) used in a traditional arma chinensis raising process are replaced with the broad bean seedlings or the pea seedlings which are easier to obtain, a host plant cultivation method in the raising process is improved, and the service life of the host plants is effectively prolonged. The method is easy to operate, the difficulty of obtaining the host plants for predatory natural enemy insect arma chinensis adults is greatly reduced, the arma chinensis raising effect is improved, and the method has an important significance in large-scale propagation and field release of the natural enemy insect, namely arma chinensis.

The invention discloses a disc brake of a motorcycle. The disc brake of the motorcycle aims to solve the problem that a brake disc needs to be replaced frequently in the prior art. According to the scheme, the disc brake of the motorcycle comprises a brake clamp and a brake disc, and the brake disc is formed by stacking a plurality of pieces of brake thin discs. By means of the technical scheme, the disc brake of the motorcycle has the advantages that when the external brake thin discs are abraded largely, the external brake thin discs can be turned over to be used or be replaced with other internal brake thin discs which are not abraded, the disc brake of the motorcycle can be used for a longer time than a brake which is made of the same raw materials with the disc brake, and cost is saved.

The invention discloses a handy stamp-pad ink feeder of a stamping machine. The handy stamp-pad ink feeder is characterized by comprising a feed box and an ink pipe by which the feed box and the ink box are communicated. The feed box is disposed on a side board of a self-service stamping machine and is provided with a flip upper cover. A feed completion indicator is disposed in the feed box and is a feed completion reference face. An upper ink wheel and a feed wheel are disposed in the ink box. The feed completion reference face is lower than the lowest part of the upper ink wheel. The handy stamp-pad ink feeder using a structural mode of external feeding is convenient to operate and easy to implement.

The invention discloses a washing type multifunctional air purification plant which comprises a plant shell. An air inlet is formed in the lower end of the plant shell, exhaust devices are arranged at the upper end of the plant shell, a sprayer and a packing layer are sequentially arranged in the plant shell from top to bottom, dust can be filtered by the packing layer, a liquid collecting opening is formed in the plant shell and is positioned below the packing layer, and an overflow groove is formed in a position below the liquid collecting opening and is connected with a liquid storage tank by an overflow plate; the liquid storage tank is connected with a circulating pump by a pipeline, and the circulating pump is connected with the sprayer by a pipeline. The washing type multifunctional air purification plant has the advantages that water is used as an air washing agent, so that the washing type multifunctional air purification plant has efficient dust removal and gas absorption functions, biological pollution sources in air can be effectively killed, and problems that filter screens need to be replaced frequently and are difficult to replace in air purification procedures can be solved; the washing type multifunctional air purification plant is high in operational flexibility and wide in application range.

The invention relates to a clamping mechanism for an automobile side wall conveying line trolley, and belongs to the technical field of automobile manufacturing. The clamping mechanism comprises a side wall conveying trolley and a side wall clamping mechanism. The side wall conveying trolley is used for conveying an automobile side wall to a set station. The side wall clamping mechanism comprisesan A column clamping unit, a B column clamping unit, a first driving unit and a second driving unit. The A column clamping unit and the B column clamping unit are located on the side wall conveying trolley. The first driving unit drives the A column clamping unit and the B column clamping unit to move in the X-axis direction. The second driving unit drives the B column clamping unit to move in theY-axis direction. When the side wall conveying trolley conveys the automobile side wall, the A column clamping unit and the B column clamping unit are separated from the first driving unit and the second driving unit. According to the clamping mechanism, clamping and conveying operation of the automobile side walls of different automobile types can be achieved, the problem that a traditional single-automobile-type conveying line is frequently replaced along with the updating operation of the automobile type is solved, then the cost of a finished automobile is reduced, and the market competitiveness of the automobile is improved.

The invention discloses a straw chopping and throwing test stand. A conveyer belt bracket of the straw chopping and throwing test stand is provided with a lifting device, and the lifting device can be used for lifting a conveyer belt so as to adjust the distance between straw and a blade; a conveyer belt chain plate is provided with a support hair brush; when being transmitted, the straw is put on the support hair brush, so that the chain plate is prevented from being mistakenly cut by the blade when the blade is used for cutting the straw; a feeding angle and a cavity-entry angle of a material baffle for blocking the straw are adjustable; the optimal feeding angle and cavity-entry angle of the baffle are designed for the straw with different masses, water contents and radii; the baffle is designed to have a smooth curved surface, thus being helpful to enable the straw to be guided into a chamber accurately and rapidly; a carrier roller is connected with a motor, so that the rotating speed of the blade can be adjusted; the conveyer belt is connected with the motor, so that the conveying speed of the conveyer belt can be adjusted. After the straw chopping and throwing test stand is adopted, different blades can be replaced for tests; the straw chopping and throwing test stand effectively improves throwing accuracy, also can solve the problem of short service life of the material baffle, reduces the phenomena of missed throwing and outward throwing, and is less in experimental energy consumption.

The invention discloses a soilless culture medium for grape, made from crushed grape shoots, organic fertilizers, calcium-magnesium-phosphate fertilizer, and a compound fertilizer. The invention also discloses a preparation method and application of the soilless culture medium for grape. Through the reasonable medium ratio, the problem that grape not dependent on soil is difficult to culture is solved, and land resource utilization at difficult sites (saline-alkaline soil, sandy soil, Gobi Desert, islands and the like); waste shoots from winter pruning of grape are used as a medium, straw waste is fully and cyclically utilized, all minerals and metal nutrients required for the growth of grape are met, materials are easy to obtain, and the cost is lowered; through the use of the complex medium, the problem that a single medium is not good for the growth and development of grape is solved; under single matching and fertility replenishing, it is possible to use for years, and the problems of short service life of a medium and frequent replacement of the medium are solved; the medium has balanced nutrition, and mineral nutrients and metal elements necessary to the growth of grape are met.

The invention discloses a ZigBee-based cloud lock wireless charging system and device. The ZigBee-based cloud lock wireless charging system includes an intelligent cloud lock, a gateway, and a control terminal, the intelligent cloud lock includes a lock body, a single-chip microcomputer, and a lithium battery. The single-chip microcomputer includes a wireless communication module for transmitting and receiving data to the gateway through the ZigBee wireless network and a wireless charging module. The gateway includes a data forwarding module for transmitting and receiving data to the control terminal through the Internet, and a wireless charging transmission module for transmitting and receiving data to the intelligent cloud lock through the ZigBee wireless network. On one hand, the data transmission between the intelligent cloud lock and the control terminal can be realized through the gateway, and on the other hand, the gateway performs the wireless charging on the lithium battery of the intelligent cloud lock via an external power supply.

The invention relates to the technical field of mounting of electric power equipment and particularly relates to a safety-health-environment mark mounting mechanism and a mounting device. The safety-health-environment mark mounting mechanism comprises an underframe assembly mounted on lines and a panel assembly detachably connected with the underframe assembly; the panel assembly comprises a platebody and an indicator detachably connected with the plate body, and snapping buckle members are arranged on the plate body; the underframe assembly comprises snapping grooves snapped with the snapping buckle members and locking mechanisms for locking the snapping buckle members. The mounting device comprises the safety-health-environment mark mounting mechanism and an insulating rod for mountingand dismounting the safety-health-environment mark mounting mechanism, and a hanging hook is arranged on the insulating rod. According to the safety-health-environment mark mounting mechanism and themounting device, the technical problems in the prior art that a safety-health-environment mark is frequent in replacement and short in use cycle, resources are wasted, and the risk is high are solved.

A load-holding test fixture for multiple specifications of nuts comprises a base connected with an universal tester, a limiting frame mounted on the base and a plurality of supports and a transmissionsystem mounted on the limiting frame, wherein the multiple supports are symmetrically arranged on the base, and used for perpendicularly placing a testing nut; a bolt pressure head is mounted in a threaded hole of the testing nut, a bolt adapter is mounted on the bolt pressure head, the universal tester is mounted on the bolt adapter in a matched mode, a plurality of fastening nuts are mounted onthe universal tester in a matched mode, and the fastening nuts are used for completing dismounting and mounting of the pressure head on the upper portion. In the process of a large-batch nut load-holding test, the upper pressure head can be replaced rapidly and conveniently, the lower supporting base does not need to be replaced, the problem that the test fixture is replaced frequently is solved,and the nut load-holding test efficiency is improved greatly.

The invention relates to an oil lubrication and sealing circulation device for a water injection booster pump, comprising a pump body, a plunger is arranged in the pump body, an auxiliary box body is arranged between the plunger and the pump body, the plunger and the pump body A sealing part is arranged between the auxiliary body; one end of the auxiliary body is provided with a pressure cap, the pressure cap is located between the auxiliary body and the plunger and the pressure cap is against the sealing part Above: a lubricating oil channel is provided in the pressure cap, one end of the lubricating oil channel is connected to an oil supply system, and the other end of the lubricating oil channel is opened on the contact surface between the pressure cap and the plunger; The pump body is provided with an oil return pipe connecting the pump body and the oil supply system. The sealing part ensures the sealing of the plunger movement process, and the oil supply system supplies oil to the lubricating oil passage, which not only effectively ensures the lubrication between the plunger, the pressure cap and the sealing part, but also reduces the relative movement between the plunger and the sealing part. resistance; at the same time, the sealing effect of the sealing parts is also improved to avoid the leakage of sewage.

The invention belongs to the technical field of waste gas treatment, and particularly relates to continuous multi-channel adsorption equipment and an industrial waste gas treatment system. The interior of the adsorption equipment is sequentially divided into an adsorption chamber, a desorption chamber and a cooling chamber from top to bottom; a temporary storage chamber is arranged on the upper portion of the adsorption chamber, a gas inlet is formed in the lower portion of the adsorption chamber, a gas outlet is formed in the upper portion of the adsorption chamber, multiple adsorption channels are formed in the adsorption equipment and penetrate through the adsorption chamber, the desorption chamber and the cooling chamber, upper inlets of the adsorption channels communicate with the temporary storage chamber, and lower outlets of the adsorption channels are connected with the temporary storage chamber through lifting devices. According to the industrial waste gas treatment system adopting the adsorption equipment, waste gas can be continuously and effectively adsorbed and treated, production efficiency is improved, economic benefits are improved, and operation cost is reduced. The adsorption equipment can realize continuous desorption and regeneration of an adsorption material, solves the problem of frequent replacement of the adsorption material, and greatly saves production cost for enterprises.

The invention relates to the technical field of water purification, and particularly relates to a modularized integrated device and method for treatment of black odor water. The device comprises a conveying component, a filtering water purifier, an on-line monitoring component and a programmable logic controller (PLC) control component; the filtering water purifier, the on-line monitoring component and the PLC control part are connected to form a normal operation loop and a filter water purification module regeneration loop through the conveying component; and a separation assembly composed ofa plurality of modules is arranged in the filter water purifier. According to the invention, through the functional design and combination of the system units, different functional units can be flexibly selected in the system according to technological requirements, and a process purpose is achieved, so that system adaptability is high. Meanwhile, the filter material modules with different filterwater purification characteristics are combined into the filter water purifier, so that miniaturization of various filtering water purification functions is realized, and the problems that a single filter water purification material is single in performance, insufficient in water quality adaptability, frequent in replacement of filter water purification material and inconvenient in replacement are solved.

The invention discloses a novel full-automatic backwashing self-cleaning filter for filtering liquid. The device comprises a housing, a shell and a sewage pump, the housing and the shell are fixedly and hermetically connected through a flange structure by a bolt; the housing comprises an inlet N1, an outlet N2 and a backwashing sewage discharge buckle N3, and an upper backwashing arm is mounted on the outer side of the coupler; an upper cover plate is mounted at the bottom end of the upper backwashing arm; upper sieve plates are mounted at two ends of the upper backwashing arm; a filter element is mounted at the bottom end of the upper sieve plate; a fixing rod is mounted on the inner side of the filter element; a bottom sieve plate is mounted at the bottom end of the fixing rod; a backwashing bushing is mounted at the bottom end of the bottom sieve plate; a lower backwashing arm is mounted at the bottom end of the backwashing bushing; a shaft sleeve is mounted at the bottom end of the lower backwashing arm. According to the automatic backwashing filter with the excellent self-cleaning effect, the problem that the filter element in a manual filter is frequently replaced is solved; meanwhile, the filter is free of manual maintenance for a long time, the labor and material cost is reduced, the filter element consumption is reduced, and the environment is better protected.

The invention discloses a security fence with an electronic display screen. The security fence comprises a fence body which is provided with the electronic display screen. An infrared sensor is mounted on the side wall of the fence body, and the infrared sensor is used for detecting personnel getting close to the security fence. When infrared signals are detected by the infrared sensor, the electronic display screen is controlled to start to conduct security reminding. According to the electronic display security fence, the problem that on-site slogans, marks and the like are frequently replaced is solved, the working efficiency is greatly improved, the expenditure is saved, the labor intensity is relieved, and meanwhile the security and reliability are ensured.

The invention discloses an intelligent flatfootcorrecting device and a correcting method. The intelligent flatfootcorrecting device comprises a shoe body, a cavity for containing an air sac is formedin the portion, corresponding to the foot arch of a user, of the shoe sole of the shoe body, and is communicated with the outside through a channel, the air sac is connected with an air feeding locking device, and the air feeding locking device is contained inthe channel;multiple film pressure sensor arrays are distributed on a shoe pad of the shoe body, and all the film pressure sensor arrays correspond to a heel area of the planta, a first plantar area of the front foot and a fifth plantar area of the front foot respectively; a data collecting controller is also arranged on the shoe body, all the film pressure sensor arrays, a storage device and a wirelesscommunicator are connected with the data collecting controller, and the wirelesscommunicator is in wireless communication with mobileequipment. According to the intelligent flatfootcorrecting device and the correcting method, the good correcting effect on a flatfoot user is achieved, and through multiple times of continuous correcting, functions of ligaments and muscles of the planta can be remodeled, and the function of normal tissue of flatfoot is recovered.

The invention provides a movable heat transfer oil fine filtration device which comprises a pressure vessel tank, a fine filtration module, a control module, a power source, a waste oil tank, a moving device, two or more lifting jacks and a traction device, wherein the lifting jacks are mounted at the bottoms of two sides of the moving device and used for assisting fixation and support; the traction device is mounted on the front side of the moving device and used for assisting traction. In the working process, heat transfer oil in a main oil return pipe flows into the pressure vessel tank through three adjacent branch oil inlet pipes, and the fine filtration module is used for filtering to remove impurities contained in the heat transfer oil, so as to improve the quality of the heat transfer oil, and the heat transfer oil after fine filtration can flow back to the main oil return pipe from respective branch oil return pipes. The system power source can be used for providing pressure for flowing of the heat transfer oil into or out of the pressure vessel tank, and the control module controls branch pipe valves to realize filtering, pollution discharge and other actions.

The invention provides a method for displaying gifts in a live broadcasting room, which comprises the following steps: receiving multiple pieces of virtual gift data, and storing the multiple pieces of virtual gift data in a gift queue; monitoring data traffic, wherein the data traffic corresponds to the quantity of the virtual gift data received in the preset time window; executing a target display strategy according to the data traffic, screening multiple pieces of target virtual gift data from the gift queue according to the target display strategy, and deleting unselected virtual gift data in the gift queue; adding the multiple pieces of target virtual gift data into a waiting queue; and sending a part of the target virtual gift data in the multiple pieces of target virtual gift data to a display queue so as to display the part of the target virtual gift data. According to the technical scheme provided by the invention, the problem that the virtual gift is quickly and frequently replaced on the display interface is solved, and the display effect of the virtual gift data and the interaction effect of audiences in the live broadcast room are effectively improved.

The invention discloses a return filter and a method of filtering fluid by using the return filter. The return filter comprises a filter cover, a filter head and a filter cartridge, wherein the filter head is arranged between the filter cover and the filter cartridge; an unframed filter element is arranged below the inner wall of the filter cartridge; a bypass valve is arranged at the upper end of the unframed filter element; a magnetic bar is arranged in the centers of the bypass valve and the unframed filter element. When the return filter is used, the fluid enters the filter head from an opening of the filter head, and enters an inner cavity of the unframed filter element by downwards flowing along an inner hole of the bypass valve; most metal particles in the fluid are absorbed by the magnetic bar, and a first level of purification of the fluid is completed; the fluid is filtered by the unframed filter element, and finally passes through holes in the filter cartridge to enter a container. The return filter and the method of filtering the fluid by using the return filter have the beneficial effects that the structural design is ingenious, the economic efficiency is improved, and the environment protection is reinforced; when the filter element is replaced and the fluid passes by the bypass valve, contaminants which are intercepted in the filter element cannot reflow to the container, and the service life of equipment is prolonged.

The invention relates to a multifunctional bus station board and a control method thereof. A station board body is provided with a monitoring and identifying device, a prompting device, a touch screenand a line display screen; a first controller is arranged in the station board body; one side of the top of the station board body is provided with a telescopic stop sign, wherein the one side of thetop of the station board body is adjacent to a road; the prompting device is used for prompting a passenger to input the bus line information of a bus to be taken through the touch screen; the firstcontroller controls the telescopic stop sign to extend out and displays a bus line where the bus needs to stop according to the inputted bus line information of the bus to be taken; and when no one needs to take a bus, the first controller controls the telescopic stop sign to retract. The invention also discloses a control method of the multifunctional bus station board. With the multifunctional bus station board and the control method thereof of the invention adopted, the invalid stop of the bus can be avoided, the operation efficiency of the bus can be improved, and traffic safety can be ensured.