8940 results about "Protective shielding" patented technology

The invention provides a multifunctional electric energy metering box, and relates to the technical field of electric energy metering boxes, the multifunctional electric energy metering box comprises an electric energy metering box, communication grooves are formed in two side walls of the electric energy metering box, first inner grooves are formed in the two communication grooves, and first heat dissipation openings and second heat dissipation openings are formed in two side walls of the electric energy metering box; the two second heat dissipation openings are located below the two first heat dissipation openings, an electric energy metering box door is hinged to the electric energy metering box, an observation window and a control panel are arranged on the electric energy metering box door, a containing groove is formed in the side wall of the electric energy metering box, a protective cover is fixedly installed on the side wall of the electric energy metering box, and the protective cover is located over the containing groove. The top of the inner wall of the electric energy metering box is fixedly provided with a fixed box body. The self-adaptive mechanism of the equipment reduces faults caused by overheating or moisture, reduces the maintenance cost, protects electrical elements, ensures the stable operation of the whole system, and improves the reliability and stability of the equipment.

The invention, which relates to the technical field of the motor, discloses a variable-frequency and variable-speed permanent magnet motor of a stator core heat dissipation structure without a casing, comprising a stator core, an end cover, a motor shaft, a rotor, an axial fan, a heat dissipation channel, a spacer ring, a heat dissipation port, a protective cover, a baffle plate and a mounting seat, the baffle plate is provided with a communication port corresponding to a mounting cavity and the heat dissipation port; the low-temperature shrinkage stress prevention assembly is mounted on the baffle and used for driving the baffle to rotate, so that the opening part of the heat dissipation opening is opened and closed; and the air flow adjusting assembly is arranged on the mounting seat and is used for adjusting the air flow in the heat dissipation channel based on the rotating speed of the motor shaft. According to the invention, the air flow adjusting assembly is used for adjusting the air flow rate in the heat dissipation channel when the rotating speed of the motor shaft changes, so that the air flow rate in the heat dissipation channel is increased when the rotating speed of the motor shaft is reduced, and thus the air flow rate in the heat dissipation channel is relatively high when the rotating speed of the motor shaft is reduced; and therefore, the influence on the gas flowing effect is small.

The invention belongs to the technical field of integrated circuit board manufacturing, and particularly relates to a pressing device for an integrated circuit board, which comprises a cabinet body and a protective cover arranged above the cabinet body, a lower pressing plate and an upper pressing plate which are used for pressing the integrated circuit board are mounted in the protective cover, the lower pressing plate is arranged in a square frame fixedly arranged on the top surface of the cabinet body, and the upper pressing plate is connected with a power driving unit arranged in the protective cover; a plurality of heat conduction parts are mounted on the corresponding surfaces of the upper pressing plate and the lower pressing plate in an array manner, and a graphene heating film is mounted in each heat conduction part; a cavity is formed in the upper pressing plate, multiple sets of pressure compensation mechanisms are installed in the cavity in an array mode, and each set of pressure compensation mechanism corresponds to each heat conduction part. According to the invention, stable and high-quality press-fit forming operation of the integrated circuit board can be carried out between the upper pressing plate and the lower pressing plate which independently control the temperature and uniformly apply pressure, so that the press-fit forming quality and the press-fit forming yield of the integrated circuit board can be improved.

The invention relates to a cable branch box, and relates to the technical field of branch boxes, the cable branch box comprises a box body and a box door installed on the box body, and the vertical side surface of the box body is provided with a heat dissipation port; an upper protective cover with an upward opening is fixedly arranged on the inner edge of the opening of the heat dissipation opening of the box body, a lower protective cover with a downward opening is fixedly arranged on the outer edge of the opening of the heat dissipation opening of the box body, a barrier plate is fixedly arranged on the edge of the opening of the lower protective cover, and a plurality of barrier holes are formed in the barrier plate; according to the cable branch box, in the application process of the cable branch box, the possibility that external impurities enter the box body is reduced through the arrangement of the upper protective cover, the lower protective cover and the blocking holes; and high-temperature gas in the box body can be discharged to the outside through the heat dissipation openings and the blocking holes, so that circulation of gas inside and outside the box body is realized, and the heat dissipation performance of the box body is ensured.

The invention relates to the technical field of power transmission line safety monitoring, and particularly discloses a self-adaptive calibration method for an ultrasonic wind speed sensor, which comprises the following steps of: arranging an orthogonal ultrasonic probe array at the top of a tower, and compensating probe offset caused by swinging of a tower body in real time through GNSS / IMU (Global Navigation Satellite System / Inertial Measurement Unit) fusion positioning; integrating a temperature, humidity and pressure sensor and vibration spectrum analysis to construct an environmental parameter compensation model; double-frequency ultrasonic waves are adopted to detect the ice accumulation thickness of the protective cover and correct the sound path distance; deploying a lightweight LSTM model at an edge computing unit to realize minute-level dynamic parameter adjustment; electromagnetic interference is suppressed by combining linear frequency modulation spread spectrum and beam forming technologies; and establishing a three-height-layer wind speed gradient model to generate a galloping early warning. The problem of measurement distortion caused by tower deformation, icing and parameter solidification of a traditional sensor is solved, all-working-condition operation from-40 DEG C to 60 DEG C is supported, and the monitoring reliability in a strong electromagnetic environment is remarkably improved.

The invention relates to an outdoor protective box-type substation, which relates to the technical field of box-type substations and comprises a box body, a box door hinged to the box body and a box cover covering the top of the box body. A plurality of heat dissipation openings are formed in the opposite vertical side faces of the box body, protective covers with downward openings are fixedly arranged on the outer side opening edges of the heat dissipation openings, and drainage covers with upward openings are fixedly arranged on the inner side opening edges of the heat dissipation openings. According to the invention, the protective cover can shield most of rainwater falling from the side surface and prevent the rainwater from directly entering the heat dissipation opening, so that the risk of rainwater permeation is greatly reduced. Meanwhile, due to the design of the drainage cover, when rainwater infiltrates accidentally, water flow can be guided to flow out upwards along the cover body, and the water flow is prevented from making contact with electrical elements in the box body. The dual protection mechanism not only guarantees the heat dissipation requirement of the box-type substation, but also remarkably improves the rainproof performance of the box-type substation, and ensures the stable operation of equipment under severe weather conditions.

The utility model relates to the technical field of box-type transformer substations, in particular to a self-heat-dissipation protective box-type transformer substation, which comprises a box-type transformer substation body, and a heat dissipation opening is formed in one side of the box-type transformer substation body; the protection mechanism is used for preventing rainwater from entering the box-type substation body; in rainy days, under the action of a guide frame and a connecting pipe, rainwater is guided into a cylinder, a piston plate is pushed to move downwards, a protection mechanism operates, under the action of the piston plate, a fixed rod and a movable rod, a movable plate is pushed to drive the bottom end of a telescopic protection cover to move downwards, and the telescopic protection cover is unfolded to block the fixed frame; the fixing frame is in a closed state in rainy days, so that rainwater is prevented from entering the box-type substation body through the fixing frame and the heat dissipation opening, the protection effect on electrical equipment in the box-type substation body in rainy days is improved, and the risk of damage to the electrical equipment is reduced.

The utility model relates to the technical field of power line plugs, and discloses a power line plug with a bending protection function, which comprises a plug, the surface of the plug is connected with a cable, the two sides of the plug are provided with protection assemblies, each protection assembly comprises a first protection cover, the first protection cover is arranged above the plug, and the second protection cover is arranged above the plug. According to the power line plug with the bending protection function, through the arrangement of the protection assembly, the plug is placed between the first protection cover and the second protection cover, the clamping blocks enter the clamping grooves, the first protection cover and the second protection cover can be stabilized, and the power line plug with the bending protection function is convenient to use. The first protective cover and the second protective cover wrap the plug and the cable, the safety problems of power leakage, short circuit, electric fire and the like caused by bending of a connecting point between the plug and the cable are avoided, and when separation is needed, the rotary knob is rotated to enable the clamping block to be separated from the clamping groove, and separation can be carried out.

The invention relates to the technical field of pole-mounted circuit breakers, in particular to a pole-mounted circuit breaker with a protective cover, which comprises a circuit breaker body, the circuit breaker body is detachably connected with the protective cover, the top of the protective cover is provided with a through hole for a cable to pass through, and two opposite side walls of the protective cover are provided with access holes in a penetrating manner. The protective cover is movably provided with a door curtain used for shielding the access hole, the door curtain and the protective cover are both provided with locking structures, and the locking structures are used for locking the door curtain on the protective cover. The circuit breaker body is protected through the protective cover, the operation safety is remarkably improved, the service life of equipment is remarkably prolonged, and the movable door curtain is arranged so that an operator can conveniently overhaul the circuit breaker body.

The utility model discloses an elevator driving protection device which comprises a protection cover, a protection mechanism used for protecting a driving part is arranged at the top of the protection cover, a ventilation mechanism used for dissipating heat of the driving part is arranged on the outer side of the protection cover, and side plates in the protection mechanism are fixedly installed on the periphery of the top of the protection cover respectively. Cross rods are fixedly mounted on the inner sides of the side plates; through the arrangement of the protection mechanism, the advantage of shielding and protecting the elevator driving piece is effectively improved, not only can the impact force generated by falling objects above be shielded and protected, but also the falling force of the falling objects can be buffered, so that the driving piece below cannot be damaged, and the service life of the elevator driving piece is prolonged. And the ventilation mechanism can accelerate the ventilation of the driving part in the protective cover below, so that the heat generated inside can be quickly dissipated, the shielding protection can be ensured, the heat dissipation protection can be realized, and the bidirectional protection can be realized.

The invention relates to the technical field of bank auxiliary equipment, in particular to a destroying device with a cleaning function. Comprising a supporting seat, a cutting plate is fixed to the inner side of the top end of the supporting seat, fixing columns are fixed to the four end corners of the top of the cutting plate, a fixing shell is fixed to the tops of the four fixing columns, a protective cover is slidably connected to the outer side of the fixing shell, and cutting-off grooves are formed in the two sides of the top of the cutting plate; a cleaning brush is slidably connected to the position, corresponding to the cut-off groove, of the top of the cutting plate. According to the destroying device with the cleaning function, through cooperation of the supporting base, the protective cover, the adjusting plate, the cutting plate, the cutting blade and the adjusting mechanism, when a bank card needing to be destroyed is located at the top of the cutting plate, the adjusting mechanism works to drive the cutting blade to destroy the bank card on the inner side of the cutting plate; and meanwhile, after the protective cover ascends, waste materials of the destroyed bank cards stacked in the stacking and collecting groove can be cleaned.

The invention relates to the technical field of laser cutting equipment, and discloses galvanized coiled plate cutting equipment which comprises a mounting frame, a guide rail structure, a cutting structure, a conveying structure, an intercepting toothed plate, a slag removal fan and a discharging structure. The cutting structure comprises a cutting seat, a laser cutting head, a separated protective cover, the intercepting toothed plate, the slag removal fan and the discharging structure; the separated protective cover is formed by splicing a plurality of splicing covers. Each splicing cover comprises an outer cover plate, an inner air box, a limiting plate, a limiting spring and an air supply hose. When the device is used, high-pressure air is blown out of the inner air box to form a protective air curtain on the splicing cover, the annular air cover and the laser cutting head, and therefore the situation that slag splashes and is intercepted, and zinc steam adheres to the splicing cover, the annular air cover and the laser cutting head can be prevented; and air is forced to be discharged along the cutting seam by the closed space formed by the separation type protective cover, so that the blowing force of the airflow to the lower edge of the notch is enhanced, and the adhering slag can be forcibly stripped.

The invention relates to the technical field of laser positioning devices, and discloses a non-woven fabric laser positioning device which comprises a machine body base used for supporting the whole device. The moving device is arranged at the top of the machine body base and is used for enabling the device to move in the working area; and the laser positioning piece is arranged on the moving device and is used for realizing high-precision laser positioning so as to ensure the cutting precision. According to the non-woven fabric laser positioning device, the air suction mechanism is arranged, so that air near the laser positioning piece is effectively sucked in, particle impurities are adsorbed on the filter screen, and the filter screen is clean when waiting for shutdown, and therefore, the laser positioning piece is kept clean in the working process, and interference of smoke and impurities is reduced; and smoke and slag are discharged through an outer ring cavity between the inner ring piece and the protective cover, so that circular flow of air is formed, smoke and slag in the cutting process are effectively taken away, impurity interference in the environment is reduced, and the stability and high precision of a laser light path are ensured.

The invention relates to the technical field of pressure transmitters, and discloses an intelligent explosion-proof high-temperature melt pressure transmitter, which comprises an output end used for outputting an electric signal subjected to pressure conversion and temperature compensation to external equipment; the connecting cable is used for connecting and transmitting electric signals; and the sensor end is used for sensing external pressure and converting the external pressure into an electric signal. According to the intelligent explosion-proof high-temperature melt pressure transmitter, the protection mechanism is arranged, a stable installation position is ensured through plane contact between the protection cover and the tank wall, further tightening of the protection cover is prevented through contact between a threaded rod piece and the outer wall of the tank wall, and the situation that the protection cover is screwed when installation threads are tightened is avoided; the induction diaphragm is tangent to the inner wall plane of the tank wall, so that complex operation is not needed in the installation process, meanwhile, accurate alignment of the plane of the induction diaphragm is kept, follow-up disassembly and overhaul of equipment are facilitated, and convenience and operation efficiency of equipment maintenance are improved.

The utility model discloses a semiconductor rectifier injection molding packaging device which comprises an upper mold, a lower mold, a base, a supporting column, a protective cover, a material injection pipe, a first air cylinder, a piston, a sealing plate, an upper cylinder body, a lower cylinder body, a metal telescopic sleeve, an annular hanging frame, a connecting rod, a second air cylinder and a circulating cooling water pipe. The four supporting columns are distributed in a rectangular mode, the upper ends and the lower ends of the supporting columns are fixedly connected with the upper mold and the base respectively, the lower mold is slidably installed on the supporting columns, and the lower mold and the upper mold are matched to form a plastic packaging mold cavity. Hot resin in the lower cylinder body is extruded through downward expansion of the metal telescopic sleeve and is injected into the plastic packaging mold cavity through the material injection pipe and the pouring gate for plastic packaging operation, the requirement for the machining precision of the piston, the inner hole of the upper cylinder body and the inner hole of the lower cylinder body can be lowered, and therefore the machining cost can be lowered; the piston cannot be blocked when the piston moves up and down and the metal telescopic sleeve does stretching / contracting movement, and the piston has the advantages of being high in use reliability and long in service life.

The invention relates to a new energy adaptive high-voltage power distribution cabinet, and relates to the technical field of power distribution cabinets, the new energy adaptive high-voltage power distribution cabinet comprises a cabinet body and a cabinet door hinged to the cabinet body, and two opposite vertical side surfaces of the cabinet body are provided with a plurality of heat dissipation ports; a protective cover with an opening facing the direction is fixedly arranged on the edge of an opening of the outer side of the heat dissipation opening, a blocking plate used for blocking the heat dissipation opening is arranged on the inner wall of the cabinet body in a sliding mode, a driving piece driving the blocking plate to slide up and down is fixedly arranged, and a blocking hole coincided with the heat dissipation opening is formed in the blocking plate. The plugging hole can be staggered with the heat dissipation opening when sliding up and down along with the plugging plate; according to the invention, the corrosion resistance of the power distribution cabinet is enhanced, the stable operation of a power system is ensured, and the power failure and maintenance cost caused by equipment faults are reduced.

The present invention discloses an intelligent onboard protection system for a plasma detector, comprising: an integrated protective cover and a nitrogen blowing port, a pressing device, a deployment device, a power supply subsystem and a control subsystem; the protective cover covers the sensor head and has an appearance consistent with the shape of the sensor head; the nitrogen blowing port blows nitrogen into the interior of the sensor during a ground test phase to prevent contamination; the system is sealed with a blocking cap before satellite launch to prevent dust contamination; the pressing device presses the protective cover against the sensor head when the system is in a protection state, and releases the protective cover by thermal cutting according to the instruction of the control subsystem; the deployment device cooperates with the pressing device to realize the deployment of the protective cover, and locks the protective cover after it is released to a specified position; the power supply subsystem supplies power to the pressing device according to the instruction of the control subsystem; the control subsystem periodically collects status monitoring parameters and transmits them to a payload management unit, controls the power on and off of the pressing device according to the ground remote control instruction, and executes the deployment operation of the system.

The invention relates to the technical field of aerogel defoaming, in particular to an aerogel slurry vacuum defoaming and dispersing device which comprises a control assembly, a lifting mechanism, a vacuum heating assembly and a stirring assembly, integrates the functions of vacuum defoaming, high-speed dispersing and uniform mixing, and is widely applied to scientific research laboratories and industrial production scenes. A high-precision vacuum system is adopted, tiny bubbles in the material are effectively removed, and the transparency and uniformity of a finished product are remarkably improved; a stepless speed regulation stirring device is arranged, so that the dispersion requirements of materials with different viscosities are met; a totally-closed acrylic protective cover and a stainless steel cavity structure are adopted, so that the operation safety is ensured, and the cleaning is easy; the touch console adopts a PLC + touch screen design, supports accurate setting and real-time monitoring of key parameters such as vacuum degree, time, stirring speed and the like, and is convenient to operate and high in repeatability.

The invention relates to the technical field of photovoltaic cleaning, in particular to an auxiliary cleaning device for a photovoltaic cleaning robot, which comprises a protective cover, a supporting transverse plate is arranged in an inner cavity of the protective cover, butt joint plates are symmetrically clamped to the left end and the right end of the supporting transverse plate, and supporting frames are fixedly connected to the sides, away from each other, of the two butt joint plates. Wherein one supporting frame is fixedly connected with the inner side wall of the protective cover through a connecting plate, the other supporting frame is directly and fixedly connected with the inner side wall of the protective cover, the butt joint plate is connected with the supporting transverse plate through a locking mechanism, and the supporting transverse plate is sleeved with a left-right shaking mechanism. The synchronous rotating seat moves close to the rotating column, and meanwhile, the synchronous rotating seat drives the regular polygon sliding column to be inserted into the regular polygon shrinkage groove; and then the supporting transverse plate is inserted between the two butt-joint plates from front to back, the butt-joint plates and the supporting transverse plate are locked through the locking mechanism, and at the moment, the butt-joint plates cannot be separated from the butt-joint grooves.

The invention relates to furniture plate laser cutting equipment and a cutting method, and belongs to the technical field of laser cutting machines.The furniture plate laser cutting equipment comprises a machining table, a cross beam is arranged on the machining table, a laser head is arranged on the cross beam, and the laser head is slidably arranged on the cross beam and slides in the length direction of the cross beam; the driving device is used for driving the cross beam to slide and driving the laser head to slide to cut a plate; a protective cover is arranged on the laser head, the protective cover is made of a transparent material, a shielding piece is arranged in the protective cover, and the shielding piece is used for forming a shielding barrier in the protective cover to weaken the light intensity; the protective cover is arranged in the laser head body in a sliding mode, the protective cover slides in the vertical direction and is contained in the laser head body, polishing abrasive paper is arranged on the bottom wall of the protective cover and the side wall close to the bottom wall, the protective cover is rotationally arranged in the laser head body, and a first driving piece used for driving the protective cover to rotate is arranged in the laser head body. The laser cutting device has the effect of improving the laser cutting safety.

The invention discloses a multi-channel combined type laser marking device, and relates to the technical field of laser marking, the multi-channel combined type laser marking device comprises a rack, the side face of the rack is fixedly connected with a bottom protection plate, the top end of the rack is fixedly connected with a supporting frame, the front side and the rear side of the supporting frame are each provided with a protection cover, and a laser marking mechanism is arranged below the supporting frame; a centering mechanism is arranged below the laser marking mechanism, a control mechanism is arranged at the front end of the centering mechanism, and a conveying belt is arranged below the control mechanism. The laser marking mechanism comprises a ventilation structure and a gas protection structure. The ventilation structure comprises a ventilation pipe, the ventilation pipe is fixedly connected to the front side face of the galvanometer module, a bent ejector rod is arranged in the ventilation pipe, the top end of the bent ejector rod is fixedly connected with a sealing piece, and the outer surface of the ventilation pipe is fixedly connected with a connecting pipe. According to the invention, the sprayed nitrogen or carbon dioxide is used for preventing oxidation or material damage.

The cutting machine with the safety protection structure comprises a working plate, the upper end of the working plate is fixedly connected with a supporting plate, a hydraulic rod is fixedly installed on the top of the supporting plate, the output end of the hydraulic rod penetrates through the supporting plate to be fixedly connected with a protective cover, and the protective cover is in sliding connection with the supporting plate. The bottom of the center end of the working plate is in bolted connection with a driving motor, the output end of the driving motor is in transmission connection with a gear, the periphery of the gear is in meshed connection with a first rack, a sliding plate is fixedly welded to the upper end of the first rack, and the sliding plate is in sliding connection with the working plate. According to the cutting machine with the safety protection structure, materials are clamped through mutual cooperation of the first clamping plate and the second clamping plate, the clamped materials can be prevented from loosening, the clamping efficiency is improved, and meanwhile workers can be protected and prevented from being hurt through descending of the protective cover.

The invention relates to a safety protection device for airtightness detection of hydrogen storage equipment, and belongs to the technical field of sealed container detection, the device comprises a protective cover and a hydrogen storage tank to be detected, the hydrogen storage tank is placed in the protective cover, and the airtightness of the tank body is detected by increasing the pressure intensity in the tank body and forming an air pressure difference with the pressure intensity in the protective cover. The air tightness detection unit comprises a transparent tube, a detection outer box body, a piston, a light source and a photosensitive element, whether the air tightness is intact or not is judged by detecting changes of light interference conditions, the device can effectively prevent operators from being hurt by hydrogen leakage in the detection process, meanwhile, the detection precision and efficiency are improved, and the protective cover comprises an upper cover and a lower cover. A complete sealed cavity is formed after splicing, a supporting seat and a sealing ring seat are arranged in the sealed cavity and used for supporting a hydrogen storage tank to be detected and separating a sealed area, through cooperative work of all the components, the device achieves efficient and accurate detection of the air tightness of the hydrogen storage equipment, and meanwhile the safety of the operation process is ensured.

The invention relates to a cutting device for production of a polyurethane aluminum alloy composite heat insulation profile, and belongs to the technical field of profile cutting, the cutting device for production of the polyurethane aluminum alloy composite heat insulation profile comprises a workbench, and further comprises a cutting mechanism; and a liquid injection mechanism. Through cooperative use of the cutting mechanism and the chip removal mechanism, when the cutting mechanism is used for cutting, the chip removal mechanism extracts chips between cutting teeth, air acts on the cutting teeth to cool the cutting teeth, in addition, airflow generated by working of the chip removal mechanism will impact between a cutting disc and a protective cover, and the cutting disc and the protective cover are not damaged. One part of the airflow enters the air inlet end of the U-shaped pipe, the chip removal capacity of the circular cutter is improved again, and the other part of the airflow is discharged through the protective cover, so that an air wall is formed between the protective cover and the cutting disc, cuttings generated by cutting are prevented from entering the protective cover, the probability that the cuttings enter the protective cover is reduced, the circular cutter is protected, and the cutting efficiency is improved.

The utility model relates to the technical field of spray guns, and discloses a spray gun protection device for preventing paint from splashing, the spray gun protection device comprises a spray gun, a nozzle, a fixing assembly, an adjusting assembly and a protection cover, the nozzle is mounted on the spray gun, and the fixing assembly is mounted on the side, close to the nozzle, of the spray gun; the protective cover comprises a mounting base arranged between the spray gun and the fixing assembly in a sleeving mode, a cover body capable of freely changing the diameter is mounted on the mounting base, and a plurality of supporting frameworks hinged to the mounting base are mounted on the outer side of the cover body. Through cooperative use of the fixing assembly, the adjusting assembly and the protective cover, the mounting base is fixed to the spray gun through the fixing assembly, the connecting ring is driven to move along the Y axis through the adjusting screw rod, the supporting rod is pulled to rotate, the cover body is pulled to expand outwards or contract inwards through the connecting column, and then the protective range of the cover body is adjusted according to needs; and the spraying effect is prevented from being affected, and the effect of improving the flexibility and efficiency of spraying operation is achieved.

The utility model relates to the technical field of gas turbine power plants, in particular to a safety ventilation device for a gas turbine power plant, which comprises a blowpipe, a connecting pipe and a filter component, the connecting pipe is fixedly connected with the blowpipe, and the filter component comprises two groups of barriers, an extension plate, a fixing plate, a driving motor, a driving gear, a protective cover, a lifting part and a cleaning part. The extension plate is fixedly connected with the blowing pipe; the fixed plate is fixedly connected with the extension plate; the output end of the driving motor is fixedly connected with the driving gear; the driving gear is meshed with the barrier pieces; in this way, the filter screen can be effectively prevented from being abraded, the service life of the filter screen is prolonged, when the filter screen is cleaned through the structural arrangement, the ventilation device can work normally, and the practicability of the device is improved.

The utility model discloses a fan protective cover structure, which relates to the technical field of fans, and comprises a fan body, a transmission part, a driving motor and a protective cover, the protective cover comprises a protective cover body, the protective cover body comprises an outer side plate and a top plate, the transmission part is positioned below the top plate, the fan body comprises a fan shaft, and the driving motor comprises a motor shaft. The distance between the fan shaft and the motor shaft in the first direction is adjustable, the protective cover further comprises an inner side plate, the transmission part is further located between the inner side plate and the outer side plate, the inner side plate is provided with a first through hole allowing the motor shaft to move in the first direction, and the motor shaft penetrates through the first through hole; and the movable protection plate is arranged on the side face, away from the outer side plate, of the inner side plate, the motor shaft is sleeved with the movable protection plate, and the first through hole is shielded by the movable protection plate. The fan solves the technical problem that in the prior art, the side, close to the fan body, of a transmission part is exposed.

The invention relates to the technical field of surveying and mapping devices, in particular to a constructional engineering surveying and mapping device which comprises a protective cover, an installation disc and supporting legs, after the installation disc is stabilized, the installation disc is limited to rotate in a protective cavity, then a total station is installed on the installation disc, and the total station can freely slide on the surface of the installation disc; if the total station encounters strong wind during measurement, once the protective cover topples over and the landing legs separated from the ground slide along the arc-shaped guide rails, firstly, the angle between the landing legs separated from the ground and the landing legs in contact with the ground is adjusted to be increased, the moment for resisting the toppling of the protective cover is increased, and the toppling of the protective cover is avoided; therefore, the damage probability of the internal structure of the total station is reduced.

The invention relates to a supporting and hanging device, in particular to a building energy-saving lighting supporting and hanging device which comprises a hanging body used for installing a lighting lamp, the hanging body at least comprises an electric push rod, a supporting and hanging part is installed on the electric push rod in a hinged mode, and a cover body is installed on the outer layer of the supporting and hanging part in a covering mode. The supporting and hanging part is used for adjusting the extension area of the cover body so as to change the illumination range of the illuminating lamp; wherein the cover body comprises a protective cover and an extension cover, the protective cover is contracted and gathered along with the increase of the length of the electric push rod, the extension cover is hinged to the bottom of the protective cover, and the extension cover and the protective cover are opposite in motion state. When the length of the electric push rod is gradually increased, the illuminating lamp gradually extends out of the cover body, and the height of the illuminating lamp is reduced; meanwhile, after the illuminating lamp extends out of the cover body, the illuminating range of the illuminating lamp is enlarged, the illuminating range is increased by lowering the illuminating lamp, the illumination intensity is less attenuated compared with that of a traditional mode, and more energy and electricity are saved.

The invention discloses a welding device for producing an automobile seat framework, and relates to the technical field of automobile seat welding. The protection assembly comprises a workbench and a lifting air cylinder. The workbench is in a cuboid shape, and the two lifting air cylinders are symmetrically fixed to the two sides of the workbench. The welding assembly is arranged on the upper side face of the workbench. The protection assembly further comprises a protection cover. The output end of the lifting cylinder is fixed on the outer wall of the protective cover; according to the welding device for the automobile seat framework, splashing chippings in the welding process can be intercepted in all directions through a protective cover, the chipping intercepting effect is improved, the welded seat framework is shielded and covered in all directions, and the chippings are shielded and intercepted; and the protective cover is arranged in an up-down lifting mode, the overall size of the device can be reduced, and the occupied area of the device is reduced.