120results about How to "Prevent dust from entering" patented technology

The invention discloses a dustproof and heat radiation electric power cabinet having a fire extinguishing function. The dustproof and heat radiation electric power cabinet comprises an electric powercabinet. The bottom parts of the left and right side walls of the electric power cabinet are evenly provided with multiple air inlet holes. The middle position of the top wall of the electric power cabinet is evenly provided with multiple air outlet holes. The left and right side walls and the top wall of the electric power cabinet are slidably connected with ventilating plates through slide rails, and the ventilating plates are provided with ventilating holes. The left and right side walls and the top wall of the electric power cabinet are fixedly provided with fixing blocks which are connected with one end of the ventilating plates through springs. The other end of each ventilating plate is fixedly connected with a second buckle. First buckles buckled with the second buckles are hinged on the bottom part and the side walls of the electric power cabinet through supports. The material of the first buckles is iron. Electromagnets matched with the first buckles are fixedly connected on the bottom part and the side walls of the electric power cabinet. Electrification is performed through the electromagnets so that the buckles are enabled to be released, and the ventilating plates slide to seal the air inlet holes and the air outlet holes to isolate oxygen and spreading of the fire can be prevented, the fire can be quickly extinguished and the loss can be reduced.

The invention provides a storage battery device with automatic storage and deployment functions. The device main body comprises a box body, a movable device, a limiting device, a stabilizer, a liftingdevice and a battery body; the movable device comprises two movable doors, and the opposite sides of the two movable doors are movably connected to left and right sides of inner walls of the box through hinges; the left and right sides of the bottom of the two movable doors and the bottom of the inner wall of the box are fixedly connected with connecting rods, one end of the connecting rods is fixedly connected with a moving ring, and the inside of the moving ring is clamped with a hook. The storage battery device with automatic storage and deployment functions has the movable device, a movable door, a connecting rod, a moving ring, a hook and a telescopic spring. After the two movable doors are opened by an external force, the telescopic springs are stretched, the telescopic springs arein a stretched state, the telescopic springs are pulled downward, and after the external force disappears, the telescopic springs drive the two movable doors to rotate.

The invention provides a spring and electromagnetism assist damping device. The spring and electromagnetism assist damping device comprises an upper shell, a lower shell, a circuit box, a supporting device, an energized solenoid and a support, wherein the upper shell can move upwards or downwards relative to the lower shell, the circuit box comprises a variable resistor and a power source, the circuit box is connected with the supporting device and the energized solenoid respectively, and the supporting device comprises a pressure plate, a magnet and a spring. A clamping groove welded to the pressure plate can drive a sliding block on a slide rheostat to move at the same time. Because of movement of the sliding block on the slide rheostat, resistance of the slide rheostat changes so as tochange the electric current in a circuit, the magnetic field intensity of the energized solenoid is changed then, the magnitude of magnetic field repulsive force between the energized solenoid and thedisk-shaped magnet is changed, and the spiral spring is assisted with damping. Leakproofness of the whole spring and electromagnetism assist damping device is kept, a damping effect is enhanced, andthe service life of the damping spring is prolonged. The spring and electromagnetism assist damping device has the advantages of being simple in structure, automatic in damping adjustment and applicable to various shock occasions.

The invention discloses an internet-of-things function detection device for internet-of-things household appliances. The internet-of-things function detection device comprises a shell, a mainboard anda baseboard, the shell is detachably connected with the baseboard, the mainboard is located on the surface of the baseboard, and is fixedly connected with the baseboard through bolts, cooling holes are formed in the side wall of the shell and are symmetrically distributed at the two sides of the shell, through holes are formed in the left side wall of the shell and are uniformly distributed at the edges of the side wall of the shell, flanges are arranged at the edges of the bottom of the shell, mounting holes are formed in the surfaces of the flanges, and fixing studs are arranged on the surface of the baseboard, and are cooperatively connected with the mainboard. By arranging the flanges at the edges of the shell, the shell is conveniently fixedly connected with the baseboard; by arranging raised strips at the bottoms of the flanges in combination with grooves in the baseboard, the structural strength of the shell and the baseboard is improved, the sealing performance of the shell and the baseboard is improved, the situation that dust enters the detection device after long-term use is avoided, and the service life of the detection device is prolonged.

The invention discloses a hidden liquid crystal lifting type integrated machine which comprises an outer body and an integrated machine main body, wherein the outer body is of a cuboid-shaped box structure of which the interior is hollow; an electric lifting post is arranged at the bottom end inside the outer body; a lifting main plate in the shape of a cuboid-shaped plate is welded on the top ofthe electric lifting post; fixing seats are symmetrically and fixedly arranged on two sides at the upper end of the lifting main plate; the integrated machine main body is also of a cuboid-shaped plate structure; connecting columns are integrally constructed at bottom ends of two groups of vertical side faces on which the wide side of the integrated machine main body is positioned; the connectingcolumns are clamped in transverse through holes of the fixing seats; a lifting groove used for enabling the integrated machine main body to pass is formed in a middle position of a top end face of theouter body; and the transverse section of the lifting groove is larger than the transverse section of the integrated machine main body. According to the hidden liquid crystal lifting type integratedmachine, the integrated machine main body can be hidden in the outer body when not used, protection of the integrated machine main body is improved, and the integrated machine main body is convenientto adjust.

The invention relates to the technical field of optical equipment, specifically relating to the technical field of sight deflection test devices, in particular to a laser beam axis sight deflection test system under external field environment. In order to overcome the problem of poor working accuracy of photoelectrical sight device and precise test devices under external field environment in the prior art, the invention adopts the following technical scheme: the laser beam axis sight deflection test system under external field environment comprises a fire mechanism, an adjusting mechanism anda receiving component, wherein, the fire mechanism comprises a first sight lens and a laser; the adjusting mechanism comprises a laser adjusting mechanism, a first sight lens adjusting mechanism, a second sight lens adjusting mechanism and a laser receiving objective lens adjusting mechanism; and the receiving component comprises a second sight lens, a laser receiving optical system and a CCD. Compared with the prior art, the invention has the advantages of high accuracy and good effect.

The invention provides a storage box capable of preventing goods from colliding during operation, and relates to the technical field of storage equipment. The storage box capable of preventing goods from colliding during operation comprises a box body, a supporting plate is movably connected to the interior of the box body, a telescopic rod is fixedly connected to the bottom of the supporting plate, a moving rod is fixedly connected to the outer side of the telescopic rod, a sliding block is movably connected to the end, away from the telescopic rod, of the moving rod, a sliding rod is fixedlyconnected to the outer side of the sliding block, and a conductive ball is fixedly connected to the end, away from the sliding block, of the sliding rod. The supporting plate is extruded by an objectto move downwards, moving rods are driven to move towards the two sides through compression of the telescopic rod, a cam is driven to move through the repulsion effect of an electromagnet and a magnetic pole, so that a clamping plate gets close to clamp the object, and the effect of preventing the object from being collided is achieved, and through cooperative use of the sliding rod and a baffle,the baffle shields a ventilation opening in the bottom of the box body, the effect of preventing dust from entering is achieved.

The invention provides a full-lamination touch display screen with a middle frame, a manufacturing method thereof and a touch device. According to the manufacturing method of the full-lamination touch display screen with the middle frame, a touch panel, the middle frame and a display screen body are sequentially arranged from top to bottom, hot melt adhesive is evenly coated between the display screen body and the touch panel in the middle frame, and the hot melt adhesive can be evenly distributed in a space composed of the touch panel, the middle frame and the display screen body through pressing and heating, so that the touch panel, the middle frame and the display screen body are firmly attached in an adhesive mode, the touch panel and the display screen body form a full-lamination structure, the reflection rate is fully reduced, light transmittance is improved, dust is prevented from entering the area between the touch panel and the display screen body, and water mist is prevented from entering the area between the touch panel and the display screen body in winter. The touch display screen and the touch device are designed to be of a full-lamination structure, the reflection rate can be greatly reduced, and light transmittance is improved, so that dust is prevented from entering the area between the touch panel and the display screen body, water mist is prevented from entering the area between the touch panel and the display screen body in winter, and the touch panel and the display screen body are connected more firmly.

The invention discloses a driving structure achieving non-clearance closing of a door plank, an air outlet device and an air conditioner. The driving structure comprises an installation seat and a door plank driving assembly installed on the installation seat, connected with the door plank and driving the door plank to act between an opening state and a closed state and further comprises a base and an installation seat driving assembly. The base is fixedly arranged relative to the position of a panel provided with a door hole. The installation seat is movably arranged on the base. The installation seat driving assembly is arranged between the base and the installation seat. When the door plank is in a closed state, the installation seat is driven to drive the door plank to move between a closing position and a disengaging position relative to the door hole. The air outlet device and the air conditioner are provided with the driving structure so that non-clearance closing between the door plank and the panel can be achieved while the movement clearance of the door plank is reserved, the appearance consistency is good, and dust can also be prevented from entering the air outlet device.

The invention relates to the field of civil air defense engineering, in particular to an automatic dust removal device for a civil air defense engineering door body. The automatic dust removal devicecomprises a wall body and a rotating cavity. The door body is movably mounted on the wall body. An air outlet cavity is formed in the door body. A rotating disc is movably mounted in the rotating cavity. Through a moving groove in an equidistant circular wave form is formed in the rotating disc, so that a connecting rod in the moving groove can be rotated around the rotating disc when the door body is used daily, and a squeeze air bag connected with the right end of the rotating disc can be driven to repeatedly move left and right, so that the squeeze air bag generates the air flow to clean the dust; and an air plug with the circular-arc recessed upper and lower sides is arranged at the left end inside an air outlet nozzle at the right end of the squeeze air bag in a recessed manner, so that when the squeeze air bag outputs the air, the acting force generated by the squeeze air bag on the air plug can be stronger, and the air plug can be easily jacked and opened; and meanwhile when theair enters the squeeze air bag, the dust can be blocked and can only be sucked out and cannot be sucked in, so that the purpose of preventing dust from entering is achieved.

The invention discloses a computer display device with good heat dissipation, comprises a display screen body and a mounting box, wherein the mounting box is fixedly mounted on the bottom side of thedisplay screen body, a mounting rod arranged in the mounting box is fixedly mounted on the bottom side of the display screen body, a rotating gear is rotatably mounted on the bottom end of the mounting rod, and two rotating rods are rotatably mounted on one side of the rotating gear. The advantage of that invention are simple structure, as the temperature in the display body rises, As that overlaparea of the first heat dissipation hole and the second heat dissipation hole increases, so that the heat dissipation effect of the display screen body is better, At the same time, when the display screen body is not used, the two cover plates are reversely moved by the tension force of the spring, so that the first heat dissipation hole and the second heat dissipation hole can be staggered, the ashes of the display screen body are effectively prevented, and the requirements of people are met.

The invention relates to a corn thresher, in particular to a multifunctional corn thresher for agricultural machinery. The technical problem to be solved by the present invention is to provide a multifunctional corn thresher for agricultural machinery that collects corn grains quickly and conveniently and is not easy to accumulate dust. In order to solve the above technical problems, the present invention provides such a multifunctional corn thresher for agricultural machinery, including a base, etc.; A discharge mechanism is provided, and a first through hole is opened on the lower part of the right side of the threshing chamber. The invention relates to a multifunctional corn threshing machine for agricultural machinery. The threshing machine is provided with a feeding mechanism, which can conveniently feed corn to be threshed into a threshing chamber through a feeding hopper, and is provided with a discharging mechanism.

The invention discloses a mold, which comprises: a top plate; an upper thermal insulation plate arranged on the lower surface of the top plate, wherein a main runner is arranged inside the upper thermal insulation plate; an upper mold plate arranged on the lower surface of the upper thermal insulation plate; a lower mold plate arranged on the lower surface of the upper mold plate, wherein a cavity communicated with the main runner is limited between the upper mold plate and the lower mold plate; a lower thermal insulation plate arranged on the lower surface of the lower mold plate; a bottom plate arranged on the lower surface of the lower thermal insulation plate; and a drawing plate connected with the top plate, the upper thermal insulation plate and the lower thermal insulation plate. The mold according to the embodiments of the present invention has advantages of easy moving and the like.

The invention discloses a multi-purpose sports teaching aid. The multi-purpose sports teaching aid comprises a frame body, a first ball groove, a second ball groove, a third ball groove, a touch integrated machine, a plurality of bat hooks and two object placing boxes, wherein the first ball groove, the second ball groove and the third ball groove are respectively formed in the top of the frame body; the touch integrated machine is arranged on the front surface of the frame body; one side of the touch integrated machine is movably arranged on the frame body through a rotating column; the bat hooks are uniformly arranged at the top of the back surface of the frame body; a plurality of bat baffle blocks which are fixed to the back surface of the frame body are arranged on one sides of the bat hooks; the two object placing boxes are symmetrically arranged on one side of the frame body; the bottoms of the object placing boxes are movably connected with one end of a box cover. According tothe multi-purpose sports teaching aid disclosed by the invention, the first ball groove, the second ball groove and the third ball groove are formed, so that various kinds of balls are convenient to place; spring covers are arranged, so that the phenomenon that dust enters the inner part of the first ball groove, the inner part of the second ball groove and the inner part of the third ball groovecan be avoided; baffle rings are arranged, so that the phenomenon that the spring covers are ejected can be avoided; the balls placed in the first ball groove, the second ball groove and the third ball groove can be clamped by a ball outlet device.

The invention discloses an infrared guiding device of an intelligent home. A first cavity is formed inside a device body, a servo motor is arranged in the first cavity, moreover, the upper portion ofthe servo motor is rotationally connected with the lower portion of a threaded rod, and the upper end of the threaded rod is rotationally connected with a device body; and the outer surface of the threaded rod is in threaded connection with a lantern ring, one side of the lantern ring is fixedly connected with a support leg, the support leg is slidingly connected with a guide groove, the guide groove is fixedly connected with the device body, moreover, the other side of the lantern ring is fixedly connected with an infrared sensor, the outer portion of the infrared sensor is fixedly connectedwith a fixing plate, and the upper end surface of the fixing plate abuts against the lower surface a rubber block. The device is reasonable in structural design and applicable, the infrared sensor isdriven to move up and down through the forward and reverse rotation of the servo motor, and a sealing plate is driven to be opened or closed while moving up and down; the infrared sensor is effectively prevented from being damaged by external impact, and dust is effectively prevented from being entered the interior of the device body; and a photosensitive switch is used for automatically judging whether a person approaches the device or not, so that the working state controlling of the servo motor is realized, and intelligent degree is high.

The invention relates to the technical field of automobile parts, in particular to an automobile headlamp dimming function guide structure. The automobile headlamp dimming function guide structure includes a shell, and a lampshade is mounted on one side of the shell; and the lampshade and the shell are fixed through threads. Heat dissipation holes are formed in the lampshade, and the lampshade andthe heat dissipation holes are integrally designed. A limiting plate is mounted in the shell; the shell is welded with the limiting plate; a mounting block is mounted in the limiting plate; by rotating a rotary lever, a second gear rotates, a third gear rotates, the axial section of the third gear is larger than that of the second gear, the mounting block is adjusted more accurately in the horizontal direction, a mounting rod is extruded, a fourth gear on the surface of the rotating rod is engaged with the first gear, a fourth neck rotates to drive the first gear to rotate, the mounting blockrotates in the vertical direction, adjustment can be conducted according to needs, adjustment is more accurate, and an internal gear cannot be damaged.

The invention relates to the technical field of elevator equipment, in particular to a protecting structure of elevator safety supervision equipment. The protecting structure of the elevator safety supervision equipment comprises a protective cover installed on the outer side of a lift car body and protecting an equipment body, the protective cover is arranged on the outer side of the equipment body, a plurality of anti-collision mechanisms are uniformly arranged at the top of the protective cover, each anti-collision mechanism comprises an anti-collision cover of an arch-shaped structure, twosliding grooves are symmetrically formed in parts, on the left sides and the right sides of the anti-collision covers, of the protective cover, the left sides and the right sides of the anti-collision covers are slidably installed inside the two sliding grooves respectively, the two sides of the anti-collision covers are fixedly connected with the two sliding grooves through two third springs, two ventilation mechanisms are symmetrically arranged on the left side and the right side of the protective cover, the ventilation mechanisms comprise ventilation openings formed in the protective cover, and a plurality of dust blocking plates are sequentially installed inside the ventilation openings from top to bottom. According to the protecting structure of the elevator safety supervision equipment, the anti-collision mechanisms and the ventilation mechanisms are uniformly arranged at the top of the protective cover, so that the equipment body is effectively protected.

A charging fixing device for a charger comprises a lifting plate and a holding box, wherein a connecting shaft is installed in the middle of the lifting plate, a panel is arranged above the connectingshaft, support rods are fixed on the left and right sides under the lifting plate, a sliding groove is arranged on the surface of the support rods, a sealing plate is installed on the inner side of the holding box, and the holding box is located in the middle of the lower side of the lifting plate. The charging fixing device for the charger is provided with a panel, Lamp fittings can be installed, the panel can be rotated with the connecting shaft so as to be used, By using the support rods and the sliding groove arranged on the support rods, a support for a sliding structure of that spool can be provided, In the bobbin, the charging wire is wound and collected by a crimping plate, and the charging wire is provided with an anti-skid cushion protection by a cushion plate and a cushion block. The crimping plate can be freely lifted and lowered on the vertical pole under the action of a force by utilizing the size cooperation between the crimping plate and the spiral groove, and the height of the crimping plate on the vertical pole can be flexibly adjusted.

A dust-proof and heat-dissipating chassis for a computer, mainly comprising a chassis, a semiconductor cooling chip, a water cooling box and a water pump, the semiconductor cooling chip is fixedly installed on the inner side of the first side, and the cold water tank is fixedly connected to the hot end of the semiconductor cooling chip; The cold water tank is fixedly connected with the water inlet pipe, the water inlet pipe is also fixedly connected with the water pump, and the water pump is also equipped with an outlet pipe, and the water outlet pipe is fixedly connected with the cold water tank; the bottom surface is also equipped with a pulley; the semiconductor The refrigerating sheet is formed by laminating two layers of semiconductor refrigerating sheets, the cold section of the upper layer of semiconductor refrigerating sheet is bonded to the hot end of the lower layer of semiconductor refrigerating sheet; the semiconductor refrigerating sheet is also equipped with a wiring port; the pulley is a self-locking pulley. The invention can quickly cool down the CPU through the semiconductor refrigeration sheet, the closed casing can effectively prevent dust from entering, low noise during operation, simple structure, convenient and practical.

The invention relates to anti-pilling spraying equipment with a blending function. The spraying equipment comprises a base, a main machine, a compressor, an air supply pipe, a spraying gun, a feedingdevice and a material conveying pipe, wherein the feeding device comprises a blending mechanism and two feeding mechanisms, the feeding mechanisms comprise feeding pipes, material injection pipes, a sealing assemblies, quantitative assemblies and conveying pipes, the quantitative assemblies comprise lifting units and quantitative plates, the blending mechanism comprises a blending tank, a mixing assembly, a compression pipe and a compression assembly, the upper side and the lower side of the two ends of the compression pipe each are provided with an air feeding pipe and an air inlet pipe respectively, and the compression assembly comprises a reciprocating unit and two compression plates. According to the anti-pilling spraying equipment with the blending function, by means of the feeding mechanism, the situation that dust is mixed into the production raw materials, so that the spraying quality is influenced can be prevented; the production raw materials can be added into the blending tank quantitatively, so that the situation that the quality is influenced due to the fact that the paint blending time is too long is avoided; and moreover, paint can be continuously and stably suppliedto the spraying gun through the blending mechanism, so that the spraying quality is guaranteed, and then the practicability of the equipment is improved.

The invention discloses a computer case which comprises a case main body, a disk fixing frame is fixed at the inner side of a front panel of the case main body, a top plate of the case main body is provided with a venting hole corresponding to the disk fixing frame, the edge of the venting hole is hinged with a cover plate matched with the venting hole, and a fan is arranged under the disk fixing frame. By the fan arranged under the disk fixing frame to blow air, air flow flows out of the venting hole, therefore, the temperature of a disk can be remarkably lowered; and when a computer is closed, the cover plate is closed, and dust is prevented from entering into the computer.

The invention relates to a transferring vehicle of engine hoods of an automobile. The transferring vehicle of the engine hoods of the automobile comprises a frame body, a cloth curtain, an inner lining and vehicle wheels. The inner lining corresponding to the frame body is arranged in the frame body, the cloth curtain is installed in front of the frame body, and the lower end portion of the frame body is provided with the four vehicle wheels. The inner lining is divided into a structure of multiple layers through transverse separating sections and each layer is further divided into a plurality of small spaces capable of containing the engine hoods by longitudinal separating sections. The integrally-manufactured non-woven fabric inner lining is installed inside the transferring vehicle and the independent spaces capable of containing the engine hoods are arranged in the inner lining so that abrasion of the engine hoods can be effectively prevented. The transferring vehicle of the engine hoods of the automobile is simple in structure, scientific and reasonable in design, capable of enabling the engine hoods to be stored in order and effectively avoiding abrasion among the engine hoods, convenient to transfer, rapid in transferring and capable of improving the work efficiency.

The invention discloses a switch cabinet which comprises a switch cabinet body (1). A plurality of line outgoing holes (6) are arranged at the bottom of the switch cabinet body (1), the switch cabinet body (1) is a door opening mechanism in the middle, the door opening mechanism is provided with a handle (2), an exhaust fan (4) is arranged at the top of the switch cabinet body (1), a semicircular dust cover (3) covers outside the exhaust fan (4) and is provided with a plurality of exhaust holes (5), and a filter screen (7) is arranged on the exhaust holes (5). The exhaust fan is arranged at the top of the switch cabinet body, and the dust cover is arranged above the exhaust fan, so that ventilation and heat radiation are guaranteed while dust can be effectively prevented from entering, and cleanness inside the switch cabinet is guaranteed. The switch cabinet is simple in design, low in cost, effective in ventilation and heat-radiation and beneficial to wide popularization.

The invention discloses an electric panel opening mechanism for a rollable hidden laser television all-in-one machine. The lifting panel mechanism is composed of a first driving motor, a first driver,a lifting driving rod, a first bevel gear, a lifting lead screw, a second bevel gear, a driving lead screw nut, a lifting guide rail assembly, a lifting connecting piece and a lifting aluminum alloypanel. The translation panel mechanism is composed of a second driving motor, a second driver, a translation driving rod, a synchronous belt assembly, a translation sliding block assembly, a translation guide rail assembly, a translation connecting piece and a translation aluminum alloy panel. The electric panel opening mechanism is reasonable in structure, the laser projection display equipment can be fixedly installed in the laser television all-in-one machine, when a user watches television, the lifting aluminum alloy panel and the translation aluminum alloy panel are moved away, the laserprojection display equipment is directly projected on a curtain, deviation is avoided, the position does not need to be adjusted every time, and when the laser projection display equipment is not used, the through groove in the cabinet body panel is in a closed state, and dust is prevented from entering.

The invention relates to a memory strip mounting structure for automatic lifting and lowering seals, including a lifting column, a base, an outer sealing groove, an inner seal groove, a power compartment, a bearing, a fixing plate, an inside sealing lug, a lifting column slot, memory strips, outer sealing lugs, a lifting column perforation and a memory strip slot. The memory strip is arranged in that middle of the base, an inboard sealing groove is arranged on the outside of the memory strip, an out seal groove is arranged on that outer side of the inn seal groove, and the lifting column groove is arranged at each corn of that base. At one end of that base is connected with the power cabin, the lifting column is divided into four, at that bottom of the four lifting columns are installed inthe four lifting column slots. The lifting column perforation is arranged at each corn of that seal cover, the lifting column is threadably connected with the lifting perforation, and the seal coveris lifted and lowered along the lifting column, and the top of the lifting column is connected with a bearing through a fixing plate. The memory strip mounting structure for the automatic lifting andlowering seals designed by the invention has good sealing performance, effective dustproof performance and convenient operation.

The invention relates to a computer display screen protection cover. The computer display screen protection cover comprises a display screen, a table surface and a clamping apparatus, wherein the bottom of the display screen is connected with a base through a supporting rod; the base is arranged at the top of the table surface; a protection cover body is arranged on the outer side of the display screen; the protection cover body comprises an outer frame, a side plate and a cover door; the side plate and the cover door are arranged on the back side and the front side of the outer frame respectively; the supporting rod penetrates through the bottom of the outer frame; two springs are connected to the bottom of an inner cavity of the outer frame; the tops of the springs are connected with rubber pads; the tops of the rubber pads are connected with the bottom of the display screen; the clamping apparatus is arranged at the end part of the table surface; and he clamping apparatus comprisestwo top plates, two bottom plates and vertical plates connected between the top plates and the bottom plates. The protection cover can be firmly fixed to the table surface through the clamping apparatus; the display screen is effectively protected through the protection cover body; dust is prevented from entering the display screen; and a certain buffering and damping effect can be generated for the display screen.