1544results about How to "Reduce working noise" patented technology

The present invention provides a lightweight constant velocity coupling that does not require grease lubrication. The pivot part (11) is assembled in the outer wheel (1), and the outer wheel (1) has a hexagonal hollow hole surrounded by 6 flat surfaces (2) parallel to the axis, and the pivot part (11 ), a first spherical surface (12a) and a second spherical surface (12b) are formed along the circumferential direction, and the first spherical surface (12a) is biased from the central position of the flat surface (2) in the circumferential direction to the circumferential direction The second spherical surface ( 12 b ) is in contact with the flat surface at a position offset from the central position to the other side in the circumferential direction. Since the outer ring 1 and the pivot member (11) are molded of synthetic resin, grease lubrication is not required, and the weight of the constant velocity coupling can be reduced.

Disclosed is an abrasive tool made of epoxy resin-bonded compound abrasive material, which comprises epoxy resin, abrasive material and curing agent. The weight percentages are as follow: the epoxy resin is 15 to 78 percent, the abrasive material is 2 to 44 percent and the curing agent is 4 to 18 percent. Wherein, the abrasive material comprises one of diamond, silicon carbide or corundum or the combination of more than one material. The curing agent comprises one of 4.4`-methylenedianil, solid diaminodiphenyl methane or liquid modified diaminodiphenyl methane or the combination of more than one material. The component of the abrasive tool also comprises the other auxiliary material, which comprises one of alumina, barium chloride, sodium chloride, quartz sand, organobentonite, wetting agent, zirconium silicate, calcium carbonate, graphite powder, garnet, magnesium sulfate, phenolic resin, zinc stearate and magnesium stearate, or the combination of more than one material. The product can be made into any shape the same with the present product, which can be applied in various grinding and polishing equipment with wide application scope.

The invention discloses a vehicle shock-absorber double-acting endurance test apparatus, comprising a hydraulic servo actuator, a hydraulic servo controller and a test bracket. The hydraulic servo controller comprises a system controlling a waveform formed by folding two sine waves with the different frequencies and swings; the hydraulic servo controller is connected with the hydraulic servo actuator; the test bracket comprises a gantry and the hydraulic servo actuator is fixed on a beam of the gantry; and the hydraulic cylinder of the hydraulic servo actuator is arranged downward and a power output shaft is fixed with the upper end of the shock-absorber to be tested and the lower end of the tested shock-absorber is fixed under the gantry. The invention can respectively brings an action with different frequencies and swings to the upper and lower ends of the shock-absorber to respectively simulate the movement of wheels and vehicle body; and the control precision is high and the noise is lower.

The invention discloses an automatic tapping machine and relates to a processing device used for processing internal screw threads. The automatic tapping machine disclosed by the invention comprises a PLC (Programmable Logic Controller) control circuit, a machine base 051, a marble slab 052, an instrument lathe 053, a positioning adjustment device 054, a limiting device 055, a feed device 056, a tapping device 057, a clamping device 058 and a deceleration motor 059, wherein the marble slab is arranged on the machine base, the positioning adjustment device and the instrument lathe are fixed onthe marble slab, and the deceleration motor is arranged at one side of the instrument lathe. Being controlled by the PLC control circuit, the feed device quickly conveys workpieces, the limiting device ensures the workpieces to be accurately clamped, and the tapping device completes the accurate positioning of screw taps and is matched with the clamping device to complete the tapping process. Theinvention aims to provide the automatic tapping machine to solve the technical problem that manual intervention is needed in the processes of feeding, positioning, clamping, tapping and loosening, and through the invention, the processing speed and the processing accuracy are improved.

A heat-dissipating device is provided. The heat-dissipating device is capable of cooperating a cross-flow type fan, mainly comprising a heat-conductive base plate attached with at least one heat-conductive pipe, and fixedly provided with a plurality of fins on the heat-conductive pipe. An air-outlet gap is naturally formed between any two of the adjacent fins, and an accommodating opening is disposed at an identical location on each of said fins. Within the accommodating opening, a cross-flow type fan is further presented. When fan blades of the cross-flow type fan rotating, an airflow thus generated is allowed for uniformly contacting with each of said fins and discharged through said air-outlet gaps. Thereby, not only the significantly raised effect of heat-dissipation of the heat-conductive base plate, but also the effectively reduced working noise due to a parallel path of the airflow with respect to the fins may be obtained.

The invention relates to the technical field of delivery equipment of printed circuit boards (PCBs), in particular to a parallelogram type connection table, which comprises a base, a movable connection block, a rotary main rod, a balancing rod parallel to the rotary main rod, a fixing support board, a movable support board, an adjusting lead screw, two board conveying devices and a driving mechanism for driving the rotary main rod to rotate. The parallelogram type connection table can achieve the aim of adjusting the width of delivered boards by rotating the lead screw and is convenient to adjust, the rotary main rod is driven to rotate under the effect of the driving mechanism and drives a movable rotary arm and a fixed rotary arm to swing, so that the movable support board and the fixed support board translate leftwards or downwards simultaneously, or the movable support board and the fixed support translate rightwards and upwards. Accordingly, transverse conveying and longitudinal conveying functions of the parallelogram type connection table are achieved, and the parallelogram type connection table is small and exquisite in structure, light in weight, convenient to assemble, low in manufacture cost, small in working noise, fast in board conveying speed and high in board delivery efficiency.

The invention discloses a double-drum washing machine, which comprises a washing machine frame, a first outer drum and a second outer drum, wherein the first outer drum and the second outer drum are arranged in the frame; the first outer drum and the second outer drum are integrally provided with balancing weight mounting columns used for mounting balancing weights; the first outer drum and the second outer drum are connected into a whole through a connecting piece; the connecting piece is fixedly connected with the balancing weight mounting columns on the first outer drum and / or the second outer drum. According to the double-drum washing machine disclosed by the invention, the first outer drum and the second outer drum are connected into an integral structure through the connecting piece so as to effectively improve the compactness of the washing machine; the connecting piece is fixedly installed and connected through the balancing weight mounting columns on the first outer drum or the second outer drum so as to increase the stability of the washing machine; moreover, a shared balancing weight is provided for the first outer drum and the second outer drum through the connecting piece; furthermore, the shared balancing weight is used by the first outer drum and the second outer drum, and the first outer drum or the second outer drum of the washing machine is used as at least one part of balancing weight of the second outer drum or the first outer drum, so that the two drums of the washing machine have an obvious damping effect, and the production cost is reduced.

The invention discloses a vehicle automatic gear shifting device, comprising a base, a shifter panel and a standard module, wherein the standard module comprises an outer casing, a shifting arm, a gear lever and a control circuit board, both the shifting arm and the control circuit board are arranged inside the outer casing, the lower end of the shifting arm is axially connected with the outer casing via a rotating axis in a manner of fit rotation; the standard module of the automatic gear shifting device further comprises a gear position detection unit which is arranged inside an installation chamber of the gear lever and is arranged in a manner of fitting with the gear lever, the gear lever achieves the purpose of gear shifting by changing the rotating angle in the slotting direction tocorrespond to Hall elements at different gear positions; the device further comprises a reinforcing structural rack which is arranged between the shifter panel and the standard module, the automatic gear shifting device can be installed and disassembled conveniently by adopting the standard module, and simultaneously, the standard module can also be transplanted to other different vehicle platforms easily.

The invention discloses a high-efficiency energy-saving grain drying machine and a drying method. The drying machine adopts a brand-new heat source design provided by an air energy heat pump. The high-efficiency energy-saving grain drying machine comprises an air energy dehumidifying pump, a main room body, an auxiliary room body, a heat exchanger, a fan, an intelligent controller, electromagnetic valves, a temperature-humidity sensor, a stacking bed, a dehumidifying mechanism and a cabin door; the intelligent controller is used for transmitting a multi-point average humidity-temperature signal inside a room obtained by the temperature-humidity sensor, and each electromagnetic valve is electrically connected with the intelligent controller so as to realize the intelligent operation of the drying machine. The high-efficiency energy-saving grain drying machine and the drying method are used for drying the grain, so that the characteristics of high efficiency, energy conservation, intelligentization in operation and good grain quality can be realized.

The invention relates to a multifunctional noodle machine comprising a machine body and a motor arranged in the machine body. A dough-making tank is arranged on the machine body. Stirring blades and a stirring rotation shaft are arranged in the dough-making tank. A dough-pressing tank is arranged on the front side of the machine body. A dough-pressing screw is arranged in the dough-pressing tank. A replaceable noodle shaping module is sleeved on the front end of the dough-pressing screw. A movable door with which the dough-pressing tank can communicate with the dough-making tank is provided on the upper end of the dough-pressing tank. When the movable door is opened, the dough in the dough-making tank can be thrown into the dough-pressing tank under a centrifugal force effect of the stirring device. Gear transmission devices are arranged between the motor and the double-pressing screw and the stirring rotation shaft. The invention aims at providing the multifunctional noodle machine with simpler structure.

The invention relates to the technical field of new energy automobiles, in particular to a control method for switching working points of a range extender. The control method includes the following steps that 1, the target power P target of the range extender is obtained; 2, the target rotation speed ntarget and the target torque Ttarget of the range extender are obtained; 3, the rotation difference value delta n of the range extender is calculated; 4, in a range extender controller, whether the absolute value of the rotation speed difference value delta n of the range extender is smaller than the set rotation speed ndiff of working point switching or not is judged, and if yes, the working point switching process of the range extender enters a small working point switching mode; if not, the working point switching process of the range extender enters a large working point switching mode. According to the control method for switching working points of the range extender, in the working point switching process of the range extender, a system make a response rapidly, rotation speed excessive adjusting can be reduced, torque impact and work noise are lowered, the service life of the range extender is prolonged, and it is guaranteed that the range extender is simple in structure.

The invention discloses a CPU (central processing unit) water-cooled radiator which comprises a radiator body, a sealing gasket and an upper cover, wherein the radiator body is a metal cavity in which a water channel is arranged, multiple pin fins are uniformly arranged on the water channel, and the pin fins are cylindrical objects integrated with the radiator body; and the edge of the inner cavity of the radiator body is provided with a groove for placing of the sealing gasket, the upper cover is pressed on the sealing gasket and hermetically connected with the radiator body, and the two ends of the water channel are respectively provided with a water inlet pipe and a water outlet pipe. The CPU water-cooled radiator disclosed by the invention has an extremely-high heat absorption efficiency and small noises; and the CPU water-cooled radiator is compact in structure, and effectively solves the problem of high heat density of a cabinet, and therefore, the CPU water-cooled radiator facilitates the creation of a green computer room.

The invention discloses a hair-planting machine in the field of hairbrush machinery. A stander is provided with a main motor, a main shaft, a brush body workbench, a hair mouth movement mechanism and drilling mechanisms, wherein the main motor drives the main shaft to rotate; a hair mouth conjugate cam and drilling conjugate cams are all arranged on the main shaft; the upper ends of drilling conjugate rockers are meshed with the corresponding drilling conjugate cams, while lower ends are hinged with the upper ends of corresponding drilling connecting rods; the lower ends of the drilling connecting rods are hinged with the middle parts of corresponding drill stems; the drill stems are positioned in drill stem holes of corresponding drill stem seats and can slide up and down along the corresponding drill stem holes; the upper ends of each drill stem are provided with a drill stem driving wheel and are driven through belts by corresponding drill stem drive motors, while the lower ends are provided with a drill bit and are parallel to a hair mouth; two sets of drilling mechanisms are positioned on the two sides of the hair mouth respectively; a space between a first drill bit and the hair mouth is twice that between a second drill bit and the hair mouth; and drilling and hair planting are sequentially finished after a bottom plate of a brush body is fixed on the workbench without replacing a fixture and recalibrating positions. Therefore, time and labor are greatly saved and the production efficiency is improved.

The invention relates to a battery and discloses a power battery module with a liquid cooling system. The power battery module is characterized in that a battery pack [2] is installed in a battery module shell [1], a coolant inflow pipe [3] and a coolant outflow pipe [4] are arranged on one side of the battery pack [2], and the coolant inflow pipe [3] is connected with a pressure pump through a coolant inlet [5]; the coolant outflow pipe [4] is connected with a heat exchanger through a coolant outlet [6]; and a radiating fin is installed on each monomer battery of the battery pack [2], and a radiating flow passage is arranged in the radiating fin and is connected with the coolant inflow pipe [3] and the coolant outflow pipe [4] through liquid-coolant parts. The power battery module with the liquid cooling system has the beneficial effects that the problems of complex process, high manufacturing cost, inconspicuous cooling effect and the like of the prior art are solved, the dimension of the battery pack is reduced, the manufacturing process is simplified, the manufacturing cost is saved, the radiating efficiency is high and the like.

The invention discloses a methane purification system and a methane purification technology thereof, solving problems of high investment cost, high operation cost, high fault rate and low purification purity of a conventional system. The system comprises an anaerobic tank (1), a particle filter (2), a drying tower (3), a desulfurizing tower (4), a gasometer (5), a steam-water separation device (6), a low-pressure methane compressor (7), an interception type prefilter (8), a refrigeration drying machine (9), an agglomeration type filter (10), an oil-water separation filter (11), a precise ultimate filter (12), a heater (13), a first CO2 / CH4 efficient separation membrane (14), a second CO2 / CH4 efficient separation membrane (19) and a methane storage tank (20), wherein a methane-enrichment port (15) of the first CO2 / CH4 efficient separation membrane (14) is communicated with a carbon dioxide purification device (16), and a carbon dioxide storage tank (17) is connected with the carbon dioxide purification device (16). The purification technology has high purification rate; and the whole set of technology can realize full-automatic operation.

The invention discloses a method for cleaning a capsule beverage dispenser, and belongs to the technical field of beverage preparation. The problems that wasting of water is caused in the cleaning process of an existing capsule beverage dispenser and the cleaning effect is poor are solved. The capsule beverage dispenser comprises a machine base with a brewing cavity, a liquid feeding mechanism, an input module and a control module. The control module controls the capsule beverage dispenser to be cleaned according to signals of the input module. The cleaning method includes a first cleaning stage and a second cleaning stage capable of being selected to be executed. The first cleaning stage at least includes a first washing step in which the liquid feeding mechanism leads liquid into the brewing cavity at a first power P1 for cleaning. The second cleaning stage at least includes a second washing step in which the liquid feeding mechanism leads liquid into the brewing cavity at a second power P2 for cleaning. The rated power of the liquid feeding mechanism is PE1, and P1<P2<=PE1. The method disclosed by the embodiment of the invention is used for cleaning the capsule beverage dispenser. The capsule beverage dispenser can be a capsule coffee maker, a capsule soybean milk machine and the like.

The invention relates to an interactive shearing type cutter structure for a food processor. The structure comprises a shearing cutter I and a shearing cutter II, wherein the shearing cutter I and the shearing cutter II are provided with a shearing cutter body respectively; each shearing cutter body is provided with a shearing blade; the blade rotary surface of the body of the shearing cutter I is opposite to the blade rotary surface of the body of the shearing cutter II; the distance L between the blade rotary surface of the body of the shearing cutter I and the blade rotary surface of the body of the shearing cutter II is more than 0 and less than or equal to 3mm; the shearing cutter I is connected with a power shaft I; and the shearing cutter II is connected with a power shaft II. The structure has the characteristics of simple structure, low cost, high crushing efficiency, small noise and good crushing effect.

The invention relates to a hickory nut shell-crushing and sorting machine. The hickory nut shell-crushing and sorting machine comprises a machine frame, a feeding module, an extruding module, a crushed shell separation sieve and a discharging module, wherein the feeding module comprises a feed hopper, a poking roller and a feeding guide slot; the extruding module comprises an extruding roller, an extruding heavy hammer, a lifting sliding rail and a cover board; the extruding roller is arranged on the machine frame through a bearing and a bearing pedestal; transverse slots are formed in the circumferential direction of the extruding roller uniformly; small round holes for accommodating the hickory nuts are formed in the transverse slot uniformly; an extruding blade is arranged in each small round hole; the lifting sliding rail is arranged on the machine frame; the cover board is arranged on the machine frame; the cover board is covered on the two sides and the top part of the extruding roller; a square hole of which the area is bigger than that of the lower end of the extruding heavy hammer is formed over the cover board; the crushed shell separation sieve is arranged under the extruding roller; and the discharging device is positioned under the crushed shell separation sieve. The hickory nut shell-crushing and sorting machine has the advantages of mechanized work, high production efficiency and stable work.

The invention discloses an air conditioner and a control method and device of the air conditioner. The air conditioner comprises an indoor unit. The indoor unit comprises a machine shell, an air handling module, multiple sets of air inlet adjusting assemblies and a switching valve. An air conditioning air flue is defined in the machine shell, and an air inlet is arranged on the machine shell. An upper air inlet area and a lower air inlet area are formed by the air inlet. The air handling module comprises a shell. A fresh air flue is defined in the shell. The method comprises the following steps that when the air conditioner operates by starting a heating mode, the air inlet is adjusted to be in the maximum air inlet state through the multiple sets of air inlet adjusting assemblies; the airinlet temperatures of the upper air inlet area and the lower air inlet area are acquired, and the temperature difference value is acquired; when the operation time reaches the first preset time, thetemperature difference value is judged; and if the temperature difference value is larger than the first preset temperature difference, the switching valve is controlled so as to control the air conditioning air flue to communicate with the fresh air flue, so that the indoor vertical temperature difference is reduced. The indoor heating power lamination phenomenon during heating operation of the air conditioner is effectively relieved, and therefore the indoor heat comfort is improved.

The invention relates to a floor mopping robot controlling dust suction power by virtue of an image and a control method. The floor mopping robot walks on a working surface and sweeps the working surface by adopting a dust suction way, a camera is arranged at the front edge of the floor mopping robot, the floor mopping robot is provided with a controller, the controller is in charge of receiving and processing the image, and the controller is also used for controlling output power of a dust suction motor. The control method comprises the following steps: acquiring the image of the working surface in a clean state; when the floor mopping robot sweeps the working surface, shooting an image of the working surface in front of the floor mopping robot while walking by the camera; and comparing a clean reference image with a working image by the controller, and controlling the output power of the dust suction motor according to a comparison result. The floor mopping robot provided by the invention has the advantages that granular dust particles on the working surface are found by photographing, controllable power of the dust suction motor of the floor mopping robot is realized, power consumption of the floor mopping robot in operation can be obviously reduced, and endurance time of a battery is prolonged.

In the front loading washing machine of the invention, a bearing block is embedded at the rear part of an outer tub and is prefabricated into an integral frame member by injection molding to improve the fastening effects between the outer tub and the bearing block and between the bearing block and a rotary drum shaft to reduce vibration and noises during the high-speed rotary dewatering of a rotary drum. The front loading washing machine mainly comprises a shell, wherein the inside of the shell is provided with the outer tub for storing washing water; and the rear side of the outer tub is connected and fixed with a motor for providing a driving force. The inside of the outer tub is provided with the rotary drum capable of rotating for washing. The rotary drum shaft which transmits the driving force of the motor to the rotary drum is connected with the rear part of the rotary drum and runs through the rear part of the outer tub, and the rear end of the rotary drum shaft is connected with the rotor of the motor. The rear part of the outer tub is provided with the cylindrical bearing block which is embedded in the rear part of the outer tub and is prefabricated into the integral frame member by injection molding. The inside of the bearing block is provided with a front bearing and a rear bearing for supporting the rotary drum shaft, and the front bearing and the rear bearing are both pressed into the inside of the bearing block through clearance fit.

The invention relates to equipment for machining metallic sheet metal pieces, in particular to a flat edge-trimming machine. The flat edge-trimming machine mainly comprises a frame (1), an electrical appliance control box (2) and a braking motor (3) which are arranged in the frame (1), an oil cylinder or cylinder device which is arranged on the upper part of the frame (1), a die assembly (39) which is divided into upper and lower parts, a transmission component which transmits the power of the braking motor (3) to the lower part of the die assembly (39), and a guide oil cylinder or cylinder (35) which ensures that the lower part of the die assembly resets, wherein the transmission component comprises a spindle (8); and the spindle (8) in the transmission component is directly connected with a braking motor shaft (4) on the braking motor (3) through a chain wheel, and the power of the braking motor (3) is transmitted to the spindle (8) after a braking motor shaft single-row chain wheel (5) on the braking motor shaft (4) is engaged with a spindle single-row chain wheel (7) on the spindle (8). The invention is characterized in that the flat edge-trimming machine can trim regularly, is low in cost, and is safe and reliable; and the flat edge-trimming machine can easily remove excess materials on the edges of drawn pieces, so that the processes are simplified, the labor intensity of workers and the machining time are reduced, the production efficiency is improved, and accident work injuries can be avoided.

The invention discloses a juice extraction machine, which comprises a base, a driving unit, a container, a cover, a spiral extraction device and a juice extraction net, wherein the bottom wall of the container 30 is provided with a through hole and a residue outlet, and the peripheral wall of the container 30 is provided with a juice outlet. The cover 40 can be covered and connected onto the peripheral wall of the container 30 and is provided with a material input opening. The spiral extraction device 50 is arranged in the container 30, and the driving unit is connected with the rotating extraction unit 50 for driving the spiral extraction device 50 to rotate relative to the container 30 for realizing the juice extraction. The juice extraction net 60 is arranged in the container 30 and is positioned outside the rotating extraction device 50, the inner wall of the juice extraction net 60 is provided with a plurality of jade cutter ribs 61 capable of realizing the jade cutter effects, and the jade cutter ribs 61 are in inclined arrangement at intervals. The juice extraction machine has the following advantages that the jade cutter ribs are in inclined arrangement at intervals and are matched with the spiral extraction device, the extracted object vortex effect can be generated and enhanced, the extraction time number and the collision time number of the extracted objects are increased, the juice extraction rate is improved, the operation speed of the extracted objects can be accelerated, and the juice extraction speed is accelerated.

The invention relates to method and equipment for disassembling waste ceramic resistors and recovering resources. In the invention, waste ceramic resistors are put into a grinding type crusher from a hopper and a feed regulation valve, wherein the grinding type crusher is internally provided with a plurality of pairs of grinding rolling shafts or rollers for grinding the waste ceramic resistors; a vibration screening machine is arranged below the grinding rolling shafts or the rollers; a vibration screening net is obliquely arranged and supported on a stand by a spring; a vibration motor is arranged below the vibration screening net; after the ceramic resistors are crushed, a mixture of ceramic powder and copper and iron pins is formed, falls on the vibration screening machine and sieved by the vibration screening net; and a steel plate plane ceramic powder collecting layer is arranged below the screening net, and an oblique discharge hole of the screening net is used for collecting the copper and iron pins for recovering metal resources. In the invention, a physical method is adopted to crush without secondary pollution, which protects the environment, saves energy and has good metal resource recovery and utilization effects.

The invention discloses an intelligent processing system for blood components, which comprises a frame, a blood bag conveying mechanism, a high-precision scanner, a label printing device with a stripping film, a label adhering device with a label absorber, a blood bag sensor, a checking device and a computer, and is characterized by also comprising a weighing sensing device, a color identification device and a sorting device, wherein the blood bag conveying mechanism is arranged on the frame; and the high-precision scanner, the blood bag sensor, the weighing sensing device, the color identification device, the label printing device with the stripping film, the label adhering device with the label absorber, the checking device and the sorting device, which are communicated with the computer, are arranged on the frame in turn along with the moving direction of a blood bag conveying surface of the blood bag conveying mechanism. Compared with the prior art, the intelligent processing system for the blood components has remarkable advantages; and the technical scheme of the invention can comprehensively and intelligently process the blood components, completely replace the manual operation process and save time and labor.

The invention discloses an electrically operated valve, aiming at the problems that the elasticity of a stopping part for preventing a coil from being loosened corresponding to a valve body is low in the prior art; the technical proposal of the invention comprises a valve seat, a valve needle, the stopping part and a stepping motor which is composed of a rotor and a stator for driving the valve needle and the valve seat to joint or detach; the stopping part is fixedly connected with a stator coil box, and internally concave bending parts which are opposite are additionally arranged above externally convex bending parts on two arm parts extended downwards thereof respectively. As the two arm parts of the stopping part are respectively provided with two bending parts, higher elasticity is obtained under the condition of same deformation, the fixation is reliable and the working noise is low; the valve has the advantages of compact structure and good assembling operability; moreover, the vibration reduction is greatly improved for obtaining accurate flow control; therefore, the valve is particularly suitable for refrigerators, air conditioning refrigerating units, water heaters and dehumidifiers, thus realizing defrosting, the flow control and on-off control and the like of a heating system.

The present invention discloses an experimental animal low-pressure cabin for plateau medicine research, and a pressure control method based on the experimental animal low-pressure cabin, and belongs to the technical field of medical scientific research instrument equipment. The experimental animal low-pressure cabin comprises a work cabinet and an electrical cabinet arranged on the bottom portion of the work cabinet, wherein the work cabinet adopts the full transparent design so as to easily meet the illumination requirements of the experimental animals and make the laboratory personnel easily perform real time observation on the experimental animals, a gas inlet pipe extending into the work cabinet and a gas discharge pipe extending into the work cabinet are arranged inside the electrical cabin, the gas inlet pipe and the gas discharge pipe are respectively provided with an electrically controlled proportional valve and a diaphragm vacuum pump, an electrical program control system is further arranged inside the electrical cabinet, and a PLC controller adjusts the dynamic balance between the gas complementing amount and the gas exhaust amount by controlling the opening degree of the electrically controlled proportional valve and the opening of the diaphragm vacuum pump so as to make the altitude fluctuation be maintained at a certain level. According to the present invention, the air pressure control way used by the control method of the present invention is unique, the fluctuation range is small, the accuracy is high, and the number of the gas exchange can be ensured.

The invention discloses an automatic oil coating device for bearings. The automatic oil coating device comprises a box body, wherein the inner side of the box body is provided with a conveyor belt; aplurality of loading trays are mounted on the conveyor belt, and the outer circles of the loading trays are further provided with gear rings; racks meshed with the gear rings are arranged on the innerwall of the rear side of the box body; the middle of the bottom of the box body is connected with an oil delivery pipe; a high-precision filter and an oil pump are separately mounted on the oil delivery pipe; a cross pipe is further arranged at the upper part of the inner side of the box body, a plurality of oil sprayers are mounted at the lower side of the cross pipe, and second electric push rods are arranged at the two ends of the upper side of the cross pipe; and the oil delivery pipe also communicates with the cross pipe through a hose, a material storage tank is arranged below the rightend of the conveyor belt, and the bottom of the box body is provided with a plurality of damping supports. The automatic oil coating device is novel in structure, great in stability, small in workingnoise, great in bearing oil coating effect, high in automation degree and favorable to popularization.

The invention discloses a ventilation and purification device which adopts a positive displacement blower, has a powerful air purification function, comprises an automatic cleaner for a filter, and is suitable for the ventilation and air purification of various buildings. The device comprises an air inlet, the blower, a filtering device, an air outlet, a controller, etc. The ventilation and purification device adopts the positive displacement blower to provide motive power for air flow, and has a steady air flow rate; a main filtering device adopts a ring-shaped band filter; one part of the band filter operates in an air filter state, and retention dirt in the other part is cleaned by a blowing device; and through the drive of an electric directive wheel, dynamic automatic cleaning of the filter is achieved.