72results about How to "Prevent flying into" patented technology

The present invention provides an un-manned airborne vehicle (UAV), for acquiring aeromagnetic data for geophysical surveying at low altitude on land or over water, comprising an extended fuselage that is adapted to hold and maintain magnetometer and a magnetic compensation magnetometer at a minimum distance from the avionics and propulsion systems of the UAV. The magnetometer measures magnetic anomalies and the magnetic compensation magnetometer measures magnetic responses corresponding to the pitch, yaw and roll of the UAV. A data acquisition system stores and removes the magnetic response measurements from the magnetic anomaly measurements. The data acquisition system also stores a survey flight plan and transmits the same to the avionics system. The generator of the UAV is shielded and the propulsion system is stabilized to reduce magnetic and vibrational noises that can interfere with the operation of the magnetometer.

The invention relates to a system and method for grinding a part weld joint based on a vision guide robot. The system comprises a laser sensor, an image collection module, an upper computer, the robot and a floating grinding head. The laser sensor, the image collection module and the floating grinding head are mounted on the sixth-axis tail end of the robot, the laser sensor is used for collecting the relative position of the robot and a part, the image collection module is used for collecting image information of the part at the specific position, and the upper computer is used for processing the image information so as to determine the weld joint position, and controlling the robot to drive the floating grinding head to grind the weld joint. According to the system, the laser sensor carries out automatic positioning of the collected image, accuracy and uniqueness of the image collecting position each time can be ensured, the system can achieve full-automatic grinding, the work efficiency is high, operation is concise, worker operation is facilitated, the ground product quality is ensured, and efficient and high-quality production of the enterprise is facilitated.

The invention discloses a special fixture for clamping frame artifacts, which comprises a base board and a plurality of Z-direction positioning devices. The working platform of the base board is horizontally provided with one row or one row and above sectional clamping grooves. The Z-direction positioning devices are respectively installed in the clamping grooves along the horizontal mid-line position of the clamping grooves. The Z-direction positioning devices comprise a Z-direction clamping cylinder which is vertically arranged at the bottom of the base board and is mounted under the groove surface of the clamping groove. The Z-direction positioning device is controlled by the Z-direction clamping cylinder to move up-and-down. The Z-direction positioning device enables frame artifacts arranged under the left and right sides of the Z-direction positioning device to be clamped in the groove, and thus the Z-direction positioning is realized. A protective cover is also mounted on the periphery of the base board. The invention provides the special fixture with vertical clamping position for clamping frame artifacts. The axial displacement of the artifacts when processing is avoided. The special fixture for clamping frame artifacts is reasonable in structure and more beautiful in appearance.

The invention relates to a badminton shuttle sucking / serving machine which comprises a framework, a shuttle barrel, a vacuumizing mechanism and a serving mechanism. The shuttle barrel, the vacuumizing mechanism and the serving mechanism are arranged on the framework, a collecting groove is formed in the framework, the shuttle barrel is arranged in the collecting groove, a shuttle sucking opening is formed in the bottom of the front end of the framework and directly faces one end of the shuttle barrel, the other end of the shuttle barrel is hermetically connected with the vacuumizing mechanism by a sucking pipe, the serving mechanism is arranged on the top of the framework, and a shuttle inlet which can be matched with the shuttle barrel is formed in the serving mechanism. The badminton shuttle sucking / serving machine has the advantages that a shuttle sucking mechanism and a serving structure are integrally combined with each other, accordingly, collected badminton shuttles can be quickly and conveniently arranged on the badminton shuttle sucking / serving machine, and the badminton shuttle sucking / serving machine is simple in structure and convenient to operate.

An ecological plant curtain makes a reader breathe fresh air when freely reading, recording, communicating, acquiring information from the internet and the like in a reading room and an information sharing space, a quiet, peaceful and comfortable learning environment is obtained, and various kinds of discomforts and diseases caused by pollution of the reading room and the information sharing space are prevented. In order to achieve the purpose, according to the technical scheme, the ecological plant curtain is composed of spraying curtain boxes and ecological climbing plants. The ecological plant curtain is characterized in that the ecological plant curtain is planted in the reading room and the information sharing space of a library, the green climbing plants and bamboo are selected as the ecological plants, and a spraying planting technology is adopted.

The invention relates to a special clamp for multi-directionally clamping frame workpieces. The special clamp comprises a baseplate, a plurality of Y-direction automatic positioning devices and a plurality of Z-direction positioning devices, wherein a row or more rows of sectional type clamping slots are transversely formed in the working table of the baseplate; the Y-direction positioning devices are arranged on the slot surfaces of the clamping slots through slot holes, and the Y-direction automatic positioning devices provide positioning thrust perpendicular to transverse center lines on two edges for the frame workpieces on the two edges to carry out Y-direction positioning on the frame workpieces; the Z-direction positioning devices are vertically mounted in the clamping slots through slot holes, and provide positioning pressure perpendicular to the baseplate for the rame workpieces at the two edges to carry out Z-direction positioning for the frame workpieces. The special clamp has a perpendicular clamping positioning function and avoids of axial play of the workpieces during processing. The special clamp has the advantages of being reasonable in structure and attractive and neat in appearance.

The invention provides a reinforcing type tempered glass window. The reinforcing type tempered glass window comprises a frame body, a window body, tempered glass, gauze elements, a winding roller, dust collection devices and an angle limiting mechanism, the window body is arranged on the center of an inner cavity of the frame body, the outer walls of the left and right sides of the top of the window body are rotatably connected with the inner walls of the left and right sides of the top of the frame body through rotating shafts, winding devices are vertically mounted on the left and right sides of the inner cavity of the frame body, the gauze elements are arranged between the two winding devices and the left and right sides of the window body, the dust collection devices are arranged on the two ends of the bottom of the frame body, the angle limiting mechanism is arranged between the frame body and the window body, the gauze elements are arranged between the window body and the frame body, mosquitoes can be prevented from flying into a room from the outside, meanwhile, due to the winding devices, the length of the gauze elements is adjustable, the angle between the window body andthe frame body is adjustable, practicability of the window is improved, in addition, due to a pressing block, dust on the surfaces of the gauze elements can be cleaned, and the appearance of the window is more clean.

A built-in tool magazine comprises a tool head, a tool holder and a tool handle; the tool holder is mounted on the tool head to clamp the tool handle; the built-in tool magazine further comprises an upright column, a driving device, a tool magazine moving support, a telescopic protective hood and a protective hood control device; the tool head is mounted on the tool magazine moving support; one end of the tool magazine moving support is arranged at a hollow bottom of the upright column; the driving device drives the tool head to rotate; the telescopic protective hood is arranged at the top of the upright column; the protective hood control device controls the telescopic protective hood to move up and down at a hollow position of the upright column. Through the upright column and the telescopic protective hood, aluminum scraps and other machining wastes can be prevented from flying into the tool head, the tool holder and the tool handle in the machining process, so that the tool magazine changes a tool relatively smoothly and the service life of the tool magazine is prolonged; the tool magazine is simple in structure, so that the cost is reduced.

An objective of the invention is to provide an automatic cleaning heat-insulation hog house. The hog house comprises outer walls, an outer corridor, outer corridor division walls, pigsty regions, pigsty region division walls, inner corridors, slatted boards, a defecation structure, and a hog house roof. The defecation structure comprises a first defecation unit, a second defecation unit, and an exhaust air duct. The hog house roof comprises a first top layer and a second top layer. The hog house is rational in layout, and temperature, humidity, and air cleanliness in the hog house are controlled in relatively good ranges, so as to ensure health growth of pigs. Through specially designed double-layer structure, the hog house roof can preferably radiate heat, thereby realizing the effect of reducing temperature of the hog house by using the roof structure to the maximum extent. When weather turns cool, original heat insulation effect is recovered. The defecation mechanism is rational in structure and simple in operation. Through using two stages of defecation units in a matched manner, pig manure can be conveniently and automatically eliminated.

The invention discloses a dust collection device during edge breaking of substrate glass. The device comprises a substrate glass edge breaking dust collection assembly, a transverse movement adjusting assembly is arranged on one side of the substrate glass edge breaking dust collection assembly, and a longitudinal movement adjusting assembly is arranged above one end, far away from the substrate glass edge breaking dust collection assembly, of the transverse movement adjusting assembly. The extension length of a scissor arm between a first cross arm and a second cross arm is changed through sliding of a movable sleeve on a guiding main sliding rod, and the extension length of the scissor arm between the first cross arm and the second cross arm is kept through automatic jacking meshing between a positioning toothed plate and a positioning rack plate. Through elastic cooperation of a second boss sliding rod jacking spring and a first boss sliding rod jacking spring and vertical sliding of an L-shaped fixing plate on a boss guiding sliding rod, elastic up-down movement of a dust collection isolation plate relative to a rectangular dust collection cover is achieved, and therefore flexible contact between a substrate glass contact rubber cushion and the surface of substrate glass is achieved.

The invention discloses a cutting machine workbench, and relates to the technical field of cutting machine accessories. The cutting machine workbench comprises a workbench body, the workbench body is a square box and is hollow, the top wall and one side wall of the working table are open, and a plurality of conveying supports are further arranged at the positions, at the same height, in the workbench body; each conveying support comprises a rotating shaft which is evenly provided with a plurality of rotating rollers, the conveying supports are in fit connection with bearings fixedly arranged on the side walls of the workbench body through the rotating shafts, and a rotating support close to the lateral wall with the opening is connected with a motor outside the workbench body; a net-shaped material support is further arranged at the diameter height position of the rotating roller inside the workbench body, a movable cover plate is arranged on the workbench body, a material receiving table is further connected to the exterior of the workbench body, and a discharging plate is erected on the top of the material receiving table; and a dust sucking channel is further formed in the material receiving channel, and a draught fan is arranged in the dust sucking channel. The cutting machine workbench is simple in structure and convenient to operate, the working efficiency is improved, dust generated during cutting can be effectively collected, air splashing is prevented, and the working state is conveniently observed.

An objective of the invention is to provide a hog house. The hog house comprises outer walls, an outer corridor, outer corridor division walls, pigsty regions, pigsty region division walls, inner corridors, and slatted boards. On a longitudinal direction in the hog house, the outer wall on a side is provided with water curtain, and the outer wall on the opposite side is provided with a fan. The hog house is provided with the horizontal outer corridor on the side which is provided with the water curtain. The outer corridor division walls separate the outer corridor from the pigsty regions. The middle of the outer corridor division wall is provided with a pigsty door, and two sides are provided with air inlet windows. The pigsty region is provided with the inner corridor and the slatted board along the longitudinal direction of the hog house. The hog house is internally provided with a group of parallel pigsty regions. The hog house is rational in layout, and through blowing of the fan and cooling of the water curtain, temperature, humidity, and air cleanliness in the hog house are controlled in relatively good ranges.

The invention discloses a sow delivery house which comprises a house body, a light shielding mechanism and a transparent house roof covering the top of the house body. The transparent house roof comprises a left light transmittance roof body, a middle ventilation roof body and a right light transmittance roof body. The middle ventilation roof body is provided with a plurality of air holes, and the air holes are covered with ceilings used for preventing impurities from flying into the house. A plurality of exhaust fans are installed on the wall of the house body. The light shielding mechanism comprises a frame arranged at the joint of the house body and the house roof. Light shielding cloth is connected to the frame, one end of the light shielding cloth is fixed to the joint of the frame and the house roof, the other end of the light shielding cloth is connected with a plurality of rolling wheels, transmission shafts are connected among the rolling wheels, and the frame is provided with tracks matched with the rolling wheels. A plurality of delivery rails are arrayed and arranged in the house body and internally provided with warm-keeping lamps. Strong light can be blocked while hot air is prevented from being brought away by cold air; natural air can pass through the air holes and be poured into the sow house through cooperation of the exhaust fans and the air holes, and thus ventilation in the sow house is enhanced.

The Improved ceiling fan lamp and ceiling fan combination structure includes: a chassis which is equipped with the fix seat extending upwardly and having a central hole with a axial positioning slot in which there is a radial through hole communicated to the external wall. the fixed stand has a central hole, the central hole has an axial locating slot, in the locating slot has a radial direction to pass the mouth to pass to the fixed stand outer wall; a fix mechanism jointed with the flange of the fix seat and having at least one reception room in which there is a first fix stopper passing through the fix seat and projecting to the central hole and being controlled by a pushing assembly; a lamp holder which is equipped with a hollow column the end of which inserted with tube is the top end and near the outer flange of the top end there is a second fix stopper jointed. The column is sleeve connected with the fix seat after being jointed with the second stopper and is connected with the first stopper to be positioned.

The invention discloses a pollination preventing and capsule protecting mesh bag for cassava artificial hybridization. The mesh bag comprises a mesh bag body (1), a drawing rope (4), a transparent plastic film (5) and a hang tag bag (6). The mesh bag body (1) comprises a front layer and a rear layer, a cavity is formed in the middle, the two sides and the bottom end are closed, a mesh bag opening (3) is formed in the upper end, and air holes (2) are densely distributed in the mesh bag body (1). The drawing rope (4) is arranged on the upper portion of the mesh bag body (1). The transparent plastic film (5) is arranged between the mesh bag opening (3) and the drawing rope (4) in the mode of surrounding by one circle, and one part of the transparent plastic film (5) extends out. The hang tag bag (6) is arranged at the lower middle end of the bag face of the mesh bag body (1). The mesh bag can prevent pollination of media such as wind and insects after artificial hybridization is finished, prevent capsules naturally maturing from cracking and losing seeds, and protect the capsules against frost injuries and cold injuries of fog; bagging is carried out once till the capsules are harvested, and a great deal of time and labor can be saved.

The invention relates to a splicing variable sun shade for an automobile skylight. The splicing variable sun shade comprises a sun shade body, and the sun shade body comprises a first sun shading body and a second sun shading body. The first sun shading body comprises a first shade body frame and a sun cloth, an extending part extends outwards on one side edge of the first shade body frame, and longitudinally distributed clamping grooves with longitudinal notches are embedded in the outer side of the extending part. The second sun shading body comprises a second shade body frame and a sun cloth. The sun cloths of both the first sun shading body and the second sun shading body are provided with air holes. An extending part also extends outwards on one side edge of the second sun shading body, a protruded part extends outwards on the other side edge of the second sun shading body, and a locating part with an external thread extends forwards at the front end of the protruded part. The locating part is in threaded connection with a locating nut, and the front ends and the rear ends of both the first shade body frame and the second shade body frame are provided with mounting bases with threaded holes. The splicing variable sun shade can achieve the effect of sun shading and prevent mosquitoes or impurities from entering an automobile through a window, can maintain ventilation in the automobile, and is suitable for automobile skylights of different lengths and high in applicability.

The invention relate to a buffering and filtering device for an air exhaust port of a vacuum pump. The device comprises a closed cavity which is formed by a first baffle, a second baffle and side walls, wherein the side walls are fixedly connected with the edges of the first and second baffles; the air exhaust port of the vacuum pump is completely occluded by the first baffle; air exhaust holes for communicating the cavity with the outside are respectively formed in the first baffle and the second baffle; and the air exhaust holes of the first baffle and the second baffle are staggered in the axial direction of the air exhaust port. The device disclosed by the invention has the advantages that the flow of sucked air can be reduced during the operation of the vacuum pump, so that the force of air motion on objects in a vacuum chamber can be reduced, and the damage of dust and foreign matters to rotary vanes of the vacuum pump is alleviated.

The invention provides a numerically-controlled laser edge trimmer and relates to the technical field of machinery. The numerically-controlled laser edge trimmer comprises a servo motor, a horizontallinear guide rail group, a vertical linear guide rail group, a frame and a cutter holder and is characterized in that the horizontal linear guide rail group is mounted at the top of the frame, the vertical linear guide rail group is movably mounted on the horizontal linear guide rail group, a servo motor in drive connection with the vertical linear guide rail group is mounted at one end of the horizontal linear guide rail group, the cutter holder is movably mounted at the lower end of the vertical linear guide rail group, a servo motor in drive connection with the cutter holder is mounted at the top of the vertical linear guide rail group, and a rotary disk fixing shaft is mounted on one side below the cutter holder. The numerically-controlled laser edge trimmer has the advantages that a thick dust falling pipe connected with dust storage drawer is arranged below the rotary disk fixing shaft, so that when the edge trimmer works, generated powder directly falls into the dust storage drawer through the dust falling pipe and does not accumulate on the edge trimmer, and the work efficiency of the edge trimmer is increased; a dust suction pipe connected with a dust collector is arrangedabove the rotary disk fixing shaft, so that floating fine dust generated during edge trimming can be sucked and recycled, and environment protection and energy conservation are achieved.

The invention relates to a novel food cover which comprises a food cover body (1) with one side being capable of being opened. Supporting rods (2) are symmetrically arranged on the two sides of the food cover body (1). The supporting rods (2) are connected with a horizontal rod (3) which is provided with an electric fan (4). Accordingly, the problem that when an insect gets close to the food cover and food is taken, the insect can seize the opportunity to fly into the food cover is solved.

The invention relates to a method for raising enzymatic chickens. The method for raising the enzymatic chickens comprises the steps of selecting chicks, building chicken coops, stocking the chicks, feeding enzymatic food and selling adult chickens. The method has the beneficial effects that chicken of the raised enzymatic chickens is high in content of nutritional ingredients, compact in texture, thin in skin, fragrant in flesh, smooth in taste and high in quality, is delicious and is free of drug residual ingredients such as antibiotics, thereby being free of any adverse effect on human health; the survival rate of the chicks is high, so that the economic benefit of raising can be improved; excrement of the enzymatic chickens is free of off odors and is easy to treat, so that the damage to raising environments is reduced; and the effect of raising is good, so that popularization is facilitated.

The invention relates to a spliced changeable sunshade for an automobile skylight. The spliced changeable sunshade comprises a sunshade body which comprises a first sun shading body and a second sun shading body. The first sun shading body comprises a first shade frame and a sun shading cloth, wherein one edge of the first shade frame extends outwards to form an extending portion, and a clamping groove which is distributed in the longitudinal direction and provided with a longitudinal notch is embedded in the outer side face of the extending portion; the second sun shading body comprises a second shade frame and a sun shading cloth, and the sun shading cloth of the first sun shading body and the sun shading cloth of the second sun shading body are both provided with vent holes; one edge of the second shade frame also extends outwards to form an extending portion, the other edge of the second shade frame extends outwards to form a protrusion portion, the front end of the protrusion portion extends forwards to form a locating portion with an external thread, and a locating nut is connected to the locating portion in a threaded mode. The front end and the rear end of the first shade frame and the front end and the rear end of the second shade frame are each provided with a mounting seat with a threaded hole. The spliced changeable sunshade has the effects of shading sunlight and preventing mosquitoes from flying into or impurities from entering an automobile from the skylight, can maintain ventilation in the automobile, and is further suitable for automobile skylights of different lengths and high in adaptability.

The invention relates to the field of outdoor equipment, and discloses a snowboard set with a self-rescue function, the snowboard set comprises a main snowboard and an auxiliary snowboard, a sliding cavity is formed in the side, opposite to the skiing direction, in the main snowboard, a connecting cavity is formed in the side, opposite to the skiing direction, of the sliding cavity, and closed door cavities are formed in the two sides of the connecting cavity in a communicating mode; a sealing assembly is arranged in the sealing door cavity and can seal the sliding cavity, a telescopic assembly is arranged in the sliding cavity, a rolling wheel cavity is formed in the auxiliary snowboard, a rolling wheel is rotationally connected between the inner walls of the rolling wheel cavity, and a connecting wire is fixedly wound around the outer circle face of the rolling wheel. According to the snowboard, two snowboards used by a victim during skiing are connected, so that a user is assisted to be tightly attached to a tree, and the user is prevented from being washed away by snow.

The invention relates to a fire hydrant cabinet, in particular to a multifunctional fire hydrant cabinet for firefighting. The technical problem to be solved by the invention is to provide the multifunctional fire hydrant cabinet for firefighting capable of conveniently treating and protecting firefighting tools. In order to solve the technical problem, the invention provides the multifunctional fire hydrant cabinet for firefighting. The multifunctional fire hydrant cabinet for firefighting comprises a box, a transparent cover plate, an opening / closing part, a winding part, a dripping part, abarrier part, a hinge frame, a dehumidifying part, a hanging piece and a fire hydrant body; the box is mounted on a wall; the transparent cover plate is hinged with the box through the hinge frame; the barrier part is fixedly connected to the inner wall of the box; and the hanging piece, the fire hydrant, the winding part and the dripping part are fixedly connected to the back wall in the box. Themultifunctional fire hydrant cabinet for firefighting achieves the effects of conveniently treating and protecting the firefighting tools.

The invention relates to an automatic screen door made by utilizing electronic induction technology and mechanical & electrical technology. An installation frame of the automatic screen door is provided with an electronic induction controller, a mini-type direct-current motor, a worm, a worm wheel, a driving wheel, an installing wheel, a steel wire rope, a folding rod and a folding door yarn. When a person gets close to the automatic screen door, the electronic induction controller energizes the mini-type direction-current motor in a forward direction and the mini-type direction-current motor rotates the worm and the worm wheel in a forward direction and the driving wheel of the worm wheel rotates at the same moment. The driving wheel drives the steel wire rope to slide towards one side. The folding rod of the steel wire rope folds and the folding door yarn disposed on the bottom of the folding rod folds. And the automatic screen door opens. When a person leaves the automatic screen door, the electronic induction controller energizes the mini-type direction-current motor in a reverse direction and the mini-type direction-current motor rotates the worm and the worm wheel in a reverse direction. The driving wheel drives the steel wire rope to slide towards the other side. The folding rod of the steel wire rope opens and the folding door yarn disposed on the bottom of the folding rod opens. And the automatic screen door closes.

The invention discloses an LED wall lamp. The wall lamp comprises a wall lamp pole, the wall lamp pole is sleeved with a cylindrical annular lampshade, two oppositely-arranged fixed blocks are fixedlyconnected between the wall lamp pole and the cylindrical annular lampshade, cavities are formed in the two fixed blocks, heat dissipation mechanisms are rotatably arranged on the top faces of the twocavities in a penetrating mode, and a driving piece is arranged in the left cavity and is in transmission connection with the heat dissipation mechanism. According to the invention, an annular connecting block connected to an insect-proof net is inserted into the cylindrical annular lampshade, an arc-shaped clamping block on the annular connecting block is matched with a plurality of spring telescopic rods to be inserted into an arc-shaped clamping groove, the annular connecting block is effectively limited, the annular connecting block is convenient to disassemble and assemble to clean the insect-proof net, and meanwhile, phototaxis mosquitoes are prevented from flying into the cylindrical annular lampshade, two rotating rods are driven to rotate at the same time through a stepping motor, the two rotating rods drive multiple blades on a circular ring to rotate, rapid heat dissipation is conducted on the LED lamp in the cylindrical annular lampshade, and the service life of the LED wall lamp is prolonged.

The invention discloses a door frame with a concealed screen door. The door frame comprises a door frame body, and is characterized in that the concealed screen door is further mounted on the door frame body, a vertical frame on one side of the door frame body is of the structure of a gauze element concealing cavity, screen door guide rails are mounted in an upper transverse frame and a lower transverse frame, and draw bar fixing fasteners are mounted in a vertical frame on the other side of the door frame body; the concealed screen door comprises an elastic take-up rotary shaft, a concealed gauze element and a draw bar, one end of the concealed gauze element is fixedly mounted on the elastic take-up rotary shaft, the other end of the concealed gauze element is fixedly mounted on the draw bar, the elastic take-up rotary shaft is fixedly mounted in the gauze element concealing cavity, fixing fastener holes are formed in the draw bar, the concealed gauze element is made of 304 stainless steel wires, and the outer surfaces of the 304 stainless steel wires are subjected to electrostatic spraying treatment so as to be protected. The door frame has the advantages that the concealed screen door is mounted in the vertical frame on the side of the door frame body, can be concealed in the vertical frame of the door frame when not used, is difficult to see from the outside and can be directly pulled out when used to form a screen door, and accordingly mosquitoes can be prevented from flying into indoor environments; the concealed screen door is directly mounted on the door frame, is quite convenient to use and is attractive, accordingly, trouble for additionally purchasing and mounting screen doors can be omitted for users, and the door frame has an additional antitheft function.

The invention relates to the field of rotary type air supply devices, in particular to an automatic rotary type air supply device. The automatic rotary type air supply device aims at solving the problem that an existing air supply opening is easy to deposit ash. According to the automatic rotary type air supply device, the following scheme are proposed, the device comprises an air pipe, wherein two air inlet pipes are connected to the air pipe, a dust blocking cover is arranged at one end, away from the air pipe, of the inlet pipe, the ash blocking cover is of a rectangular structure and is fixedly connected to the inlet pipe, a circular mounting groove is formed in the ash blocking cover, a filter plate is movably arranged in the mounting groove, a fan-shaped filtering opening is formed in the surface of the filtering plate, a filtering screen is covered on the surface of the filtering opening, a rotating shaft is movably connected to the middle of the filtering plate, one end of therotating shaft perpendicularly penetrates through the filtering plate, and the surface of the filtering plate is fixedly connected with a positioning annular sliding rail. According to the invention,the filter plate is arranged at the pipe orifice of the inlet pipe, so that excessive impurities in the air can be prevented during air supply, most of large-particle impurities can be filtered, and the cleanliness degree of the air supply can be guaranteed.