50results about How to "Shock absorption stability" patented technology

The invention provides a polyurethane micropore elastomer composite material of low spring rate ratio for urban rail and a preparation method thereof, and belongs to the field of polyurethane materials. The material has the excellent performance of high strength, wear resistance, flex resistance, low temperature resistance and oil resistance, chemical resistance and the like, and has the characteristics of low buffer stress, stable damping, short response time and the like. The polyurethane micropore elastomer composite material of low spring rate ratio for urban rail comprises a polyurethane main material, the polyurethane main material is prepared by mixing a component A and a component B, the component A is prepared by the following materials: 75-90% of polyether polyol, 8-18% of a chain extender, 0.5-1% of an anti-oxidant, 0.5-1% of an amine catalyst, 0.1-0.5% of a foaming agent, 1-4% of an organosilicon foam stabilizer, and 0.1-0.5% of color paste. The materials are uniformly mixed at 100-120 DEG C, the water content in the mixture is below 0.05%, and that is the component A; the component B is obtained by a reaction of 30-60% of isocyanate and 40-70% of polyol at 80-90 DEG C for 3-4 hours.

The invention discloses a stable-type damping device, which comprises at least two magnets. Opposite magnetic poles of the magnets are adjacent, the magnets are hinged on a cross shear-type expansion bracket, retaining-and-guiding inner sleeves are sleeved outside the magnets, upper end seats and lower end seats are disposed at both ends of the retaining-and-guiding inner sleeves respectively andconnected with both ends of the cross shear-type expansion frame respectively, and damping springs are installed between the upper end seats and the lower end seats. Since opposite magnetic poles of adjacent magnets are arranged oppositely, the closer the distance, the greater the attraction; when severe vibration occurs, the damping springs are compressed and deformed greatly, the elasticity of the damping springs increases linearly with the deformation; when the deformation of the damping springs increases, the distance between adjacent magnets decreases, the attraction increases geometrically, a part of increased elasticity is offset, in other words, impact force to car frames is decreased. By the stable-type damping device, stable damping can be realized when the elasticity of damperscan be kept changing mildly and nonlinearly within a bigger deformation range.

The invention discloses a high-damping vibration-reduction rubber bearing for a bridge. The high-damping vibration-reduction rubber bearing comprises a rubber block, the upper surface of the rubber block is fixedly connected with an upper connection plate, and the upper surface of the upper connection plate is in lapped connection with the lower surface on an upper pre-buried plate. According to the high-damping vibration-reduction rubber bearing for the bridge, by arranging supporting rods, rolling wheels, trapezoidal blocks, sliding devices and elastic devices, vibration of the bridge drivesthe two supporting rods and the two rolling wheels to move downwards through the upper pre-buried plate and the upper connection plate, and under pressure, first springs can generate elastic force soas to reduce vibration of the upper pre-buried plate; by arranging vibration-reduction devices, under pressure, second springs can generate elastic force so as to reduce vibration of the upper connection plate. In this way, vibration of the pre-buried plate is reduced through multiple structures, the vibration-reduction ability of the upper pre-buried plate is improved, the damage to the rubber block can be reduced, and the service life of the rubber block is ensured.

The invention provides an easy-to-adjust desk and relates to the field of education. The easy-to-adjust desk comprising a base is characterized in that a lifting box is disposed above the base; both sides of the bottom of the lifting box are fixedly installed with supporting feet; one end, far from the lifting box, of the supporting feet penetrates the base and extends into the inner portion of the base; both sides of the base are fixedly mounted with fixed angle iron; a lifting plate is arranged above the lifting box; the middle portion of the bottom of the lifting plate is fixedly mounted with racks which penetrate the lifting box and extend into the inner portion of the lifting box; a buffer tank disposed on the bottom of the racks is fixedly mounted in the middle of the bottom of innercavity of the lifting box; two gear shaft support blocks are fixedly mounted on both sides of the top of the inner cavity of the lifting box. The easy-to-adjust desk has the advantages that with thearrangement of a connecting rod to cooperate with the lifting of a moving block, a table board can be folded; the table board can be unfolded upwards when a large area of a desktop needs using; the table board can be closed downwards when the desk needs no use.

The invention discloses a portable biological reagent kit. The portable biological reagent kit comprises a shell; an upper cover is installed at the upper end of the shell; the front inner wall and the rear inner wall of the shell are each fixedly connected with two first circular rings; second circular rings concentric with the four first circular rings are arranged in the four first circular rings, and the four second circular rings are all fixedly connected with the inner wall of the shell; every two arc-shaped blocks which are arranged up and down are slidably connected between the first circular ring and the second circular ring on the same side; and every two arc-shaped blocks are jointly and fixedly connected with a vertical rod, and a horizontal plate is fixedly connected between every two vertical rods which are opposite front and back. The portable biological reagent kit is reasonable in structure, it can be guaranteed that the horizontal plate is always in a horizontal state, that is, the biological reagent kit is always in a horizontal state, so that the situation that liquid in the biological reagent kit contaminates the inner wall of the biological reagent kit with alarger area is avoided, the possibility that cultured cells die or leak out is avoided, and the damping effect on the biological reagent kit is better.

The invention discloses a damping type high polymer material bearing machining machine tool capable of cleaning chippings efficiently and relates to the technical field of machine tools. The machine tool comprises a transverse plate, wherein the upper surface of the transverse plate is fixedly connected with the lower surface of a U-shaped plate; the upper surface of the inner wall of the U-shapedplate is fixedly connected with the upper surface of a first connecting plate through a first electric push rod; and the lower surface of the first connecting plate is fixedly connected with the upper surface of a motor. According to the damping type high polymer material bearing machining machine tool capable of cleaning chippings efficiently, through cooperation of the motor, the first electricpush rod, a turning tool, a placement block, a first through hole, a third through hole, a feeding hopper, a pressing plate and a second through hole, the pressing plate moves close to a placement plate, and then, chippings generated in the second through hole and during the last bearing machining process can be collected to be treated simply, so that the workpiece machining precision can be ensured to certain degree, and the chippings are prevented from hurting the hands of people when the people operate the machine tool.

The invention discloses a new energy automobile motor placement box with a good use effect, which relates to the technical field of new energy automobiles. The new energy automobile motor placement box comprises a box body, sliding grooves are formed in the left and right side surfaces of the inner wall of the box body, sliding blocks are slidably connected in the sliding grooves, and the oppositesurfaces of the two sliding blocks are fixedly connected with the left and right side surfaces of a placement plate separately; and a placement groove is formed in the upper surface of the placementplate. According to the new energy automobile motor placement box with the good using effect, through cooperation of telescopic rods, first springs, a placement plate, sliding blocks and sliding grooves, the placement plate extrudes the telescopic rods and the first springs downwards at the same time, and after the placement plate moves to the lowermost position, the first springs can drive the placement plate and the motor body to move upwards through elasticity of the first springs; and then, the vibration of the motor body can be buffered by repeating the process for many times, so that parts in the motor body are not easy to loosen or even fall off due to vibration, and the normal work of the motor body and the normal running of an automobile can be ensured to a certain extent.

It is an object of the invention to provide a technique for further improving the vibration reducing performance in the power tool, while avoiding complicating the construction of the power tool. According to the present invention, a representative power tool may comprise a striker, a tool bit and a vibration reducer. The vibration reducer serves to reduce vibration on the striker by reciprocating in a direction opposite to the reciprocating direction of the striker. The path of the center of gravity of the vibration reducer is arranged to coincide with a path of the center of gravity of the striker. With such construction, because rotating moment is not exerted onto the reciprocating cylinder during the operation of the power tool, vibration reduction can be performed in a stable manner.

The invention discloses a shock absorption and noise reduction structure of an automobile engine. The shock absorption and noise reduction structure comprises a bag type air shock absorber and a hydraulic shock absorber, a bolt fixing hole is welded in the center of the top surface of the bag type air shock absorber, and one side of the bolt fixing hole penetrates through the top surface of the bag type air shock absorber and is provided with an air conveying hole; an air outlet pipe is arranged at the other side of the bolt fixing hole and penetrates through the top face of the bag type air shock absorber, an air outlet pipe electric switch is arranged on the top face of the air outlet pipe, and a hydraulic shock absorber is welded to the bottom face of the bag type air shock absorber; atemperature sensor is arranged on the surface of the hydraulic shock absorber, and a bolt fixing hole is welded to the bottom face of the hydraulic shock absorber. In the present invention, the bag type air shock absorber and the hydraulic shock absorber are arranged, the hydraulic shock absorber has a more obvious filtering effect for the larger jolts, the bag type air shock absorber has a more obvious filtering effect for the small jolts, with the combination of the hydraulic shock absorber and the bag type air shock absorber, the larger jolts can be fully filtered, meanwhile, the better filtering effect on the smaller jolts can be achieved, and the better driving and riding experience is brought to the automobile users.

The invention discloses a pasting device for pasting a fiber composite material on the surface of a concrete structure. The pasting device comprises a glue storage box, a fiber composite material storage box and a bracket which are all mounted on a base. A rotating frame is rotatably arranged on the bracket, and a gluing roller and a pasting roller are arranged at the two ends of the rotating frame respectively. A glue spraying head is also arranged on the bracket, communicates with the glue storage box through a pipeline, and is arranged towards the gluing roller. The rotating frame is rotated to make the gluing roller contact the surface of the concrete structure, the glue spraying head sprays glue to the gluing roller, and when the base moves, the gluing roller smears the glue to the surface of the concrete structure. After gluing is completed, the rotating frame is rotated to make the pasting roller contact the surface of the concrete structure, the fiber composite material is introduced from a fiber composite material storage device to the bottom of the pasting roller, and the pasting roller is moved to paste the fiber composite material to the surface of the concrete structure coated with the glue. The pasting device is simple in structure, and the pasting efficiency and the pasting quality can be effectively improved.

The invention discloses a shockproof mechanism of a laser cleaning machine, and relates to the technical field of laser cleaning. According to the key points of the technical scheme, the shockproof mechanism comprises a machine station and a laser host, a magnetic suspension base is arranged at the bottom of the laser host, and a magnetic suspension device used for providing magnetic suspension force for the magnetic suspension base is arranged on the machine station; the magnetic suspension device is arranged below the magnetic suspension base and connected with a control system used for controlling magnetic suspension force, a supporting seat is arranged at the bottom of the machine station, a buffering piece used for providing buffering force is arranged between the supporting seat andthe machine station, and one end of the buffering piece is connected to the supporting seat; and the other end of the buffering piece is connected with a supporting sheet and abuts against the bottomof the machine station through the supporting sheet. According to the shockproof mechanism, the damping effect can be improved, the magnetic suspension force can be adjusted according to requirements,the damping requirements under different working environments are met, the stability of the laser host is improved, and the effect of improving the laser beam output stability is achieved.

The cable intermediate joint of the invention discloses a cable intermediate joint in which an air cavity sealing area is arranged at the cable connection position to protect and isolate the cable connection. The structure is simple, the use is convenient and fast, and the safety is better. It is characterized in that it includes an upper fixed connection part, a lower fixed connection part and a rubber sleeve for negative pressure expansion. The upper fixed connection part and the lower fixed connection part are connected by fastening screws, and form The airtight cavity accommodates the cable connection point, the rubber sleeve is placed at the cable connection point, and the two ends are tightly wrapped with the cables on both sides of the cable connection point. Negative pressure is generated inside to expand the rubber sleeve.

The invention relates to the technical field of tractor suspension, in particular to a hydraulic control system of a tractor suspension mechanism. The system comprises limiting rods, limiting sliding grooves are formed in the centers of the surfaces of the side walls of the two ends of the limiting rods, one end of the limiting rods is fixedly connected with a first limiting rod connecting lug, a limiting rod hinge hole is formed in the first limiting rod connecting lug, the other end of the limiting rods is fixedly connected with a second limiting rod connecting lug, and the top end of a buffer rod is fixedly connected with a second hinge seat. By arranging a screw rod, the limiting rods and a hydraulic lifting rod are arranged on the screw rod, and the positions of the limiting rods and the hydraulic lifting rod are adjusted through locking nuts, so that the distance between suspension mechanisms is adjusted, and the connection requirement for connection of agricultural tools such as ploughs of different sizes can be met. A stretching rod is arranged, the limiting rods are stabilized and damped through a third spring, and the two limiting rods draw close to each other, so that the plough is clamped and fixed, and the stability of fixing the plough is improved.

The invention discloses a pneumatic power generation type vehicle shock absorption and energy storage device comprising a supporting mounting plate. A supporting mounting barrel is vertically and upwards arranged in the middle of the upper end of the supporting mounting plate; a restrain damping cylinder is arranged in the middle of the interior of the supporting mounting barrel in a vertical embedded mode; a lifting damping column is vertically arranged at the position, matched with the restrain damping cylinder, of the middle of the upper end of the supporting mounting barrel through an embedded guide barrel; the lower end of the lifting damping column extends into the restrain damping cylinder and is horizontally provided with an air pressure piston plate in a matched mode; a damping mounting plate is horizontally and coaxially arranged at the upper end of the lifting damping column; four sets of limiting lifting columns are vertically arranged at the position, below the supportingmounting barrel, of the supporting mounting plate at equal angles; a high-pressure cylinder is horizontally arranged on the right side of the supporting mounting plate; and a pneumatic power generation and storage structure is arranged at the upper end of the high-pressure cylinder. The pneumatic power generation type vehicle shock absorption and energy storage device has the advantages of being compact in structural design, safe in limiting, stable in operation, capable of collecting energy in an air pressure limited mode, high in efficiency, stable in damping and the like.

The invention discloses a radar base capable of absorbing shock. The radar base comprises a base body. A cavity is arranged in the base body, a first groove is arranged in the upper surface of the base body, two symmetrical first fixing strips are fixedly connected to the inner side wall of the cavity, and first sliding grooves are arranged in side faces, close to each other, of the two first fixing strips. According to the radar base capable of absorbing shock, shock absorption columns can complete shock absorption again in a vertical direction; a secondary shock absorption effect of a foundation is improved; and lateral deviation of the shock absorption columns is avoided while shock absorption is achieved. A problem that the existing radar base cannot be damped for multiple times is solved; and the radar base has advantages that multiple shock absorption effects can be achieved, preliminary shock absorption of the fixing base can be completed on the vertical plane, the preliminary shock absorption effect of the radar base is improved, the fixing base does not deviate while shock absorption is performed on the vertical plane, the problem that an existing radar is poor in shock absorption effect is solved, and preliminary shock absorption is stabilized.

The invention discloses a pneumatic feedback type automobile shock suppressing and absorbing device. The device comprises a support mounting disc. A support mounting barrel is arranged vertically upwards in the middle of the upper end of the support mounting disc. A shock suppressing and absorbing cylinder is vertically embedded in the middle of the interior of the support mounting barrel. A lifting shock absorbing column is vertically arranged in the middle of the upper end of the support mounting barrel through an embedded guide barrel and is matched with the shock suppressing and absorbingcylinder. The lower end of the lifting shock absorbing column stretches into the shock suppressing and absorbing cylinder and is provided with a pneumatic piston barrel horizontally in a matched mode,and a plurality of flow guide inlet holes are uniformly formed in the middle of the shock suppressing and absorbing cylinder in a penetrating mode. Four groups of limit lifting columns are verticallyarranged in the position, below the support mounting barrel, of the support mounting disc at equal angles. A high-pressure cylinder is arranged horizontally on the right side of the support mountingdisc. A pneumatic feedback shock absorbing structure is arranged at the right end of the high-pressure cylinder. The pneumatic feedback type automobile shock suppressing and absorbing device has the advantages that the structural design is compact, limit is safe, operating is stable, the air pressure is limited, energy is collected, the efficiency is high, and shock absorbing is more stable.

The invention relates to a shock attenuation device for a high-altitude dropped object, which comprises a buffering outer bag, a Ti -Ni alloy wire net, a buffering inner bag, hydraulic pipelines, an adjusting nut, a throttling nozzle, a supporting pallet and a sealing sheet, wherein the Ti -Ni alloy wire net is arranged between the buffering outer bag and the buffering inner bag, and the Ti-Ni alloy wire net and the supporting pallet are molded into a whole with a mould by technological vulcanization; the inner surface of the supporting pallet is provided with more than two hydraulic pipelines; one end of each hydraulic pipeline is communicated with the adjusting nut, while the other end is communicated with the liquid of the buffering inner bag; the adjusting nut is matched with the throttling nozzle through threads; and the outside of the adjusting nut is bonded with the sealing sheet. The shock attenuation device does not influence flight trajectory of the high-altitude dropped object, and always remains unchanged to the resistance of the dropped object in the whole buffering process so as to ensure uniform deceleration of the dropped object; and most external impact energy is dissipated in a buffering device, and almost no resilience force acts on the dropped object after the buffering process is finished.

A medical transfer bed structure capable of side-sliding docking, including a bed body and a mattress assembly, the mattress assembly includes an upper mattress and a lower mattress arranged up and down, the bottom of the upper mattress is a first slide, and the first slide is provided with a second slide. One airbag, the first slide plate is inclined and is provided with arc guide column, the bottom of the mattress is the second slide plate, the second slide plate is provided with the second air bag, the second slide plate is inclined and is provided with arc guide groove corresponding to the arc guide column , so that the upper mattress can slide laterally relative to the lower mattress; an assembly groove is arranged on the first slide plate, a locking mechanism is arranged in the assembly groove, a first pin hole is opened at the bottom of the assembly groove, and a second pin hole is arranged on the lower mattress. The two pin holes correspond coaxially to the first pin hole. The locking mechanism includes a locking pin that can be inserted into the first pin hole and the second pin hole. Press down and rotate the locking mechanism so that the upper mattress and the lower mattress lock Tight can not slide. In the transfer bed structure of this case, the upper mattress can slide laterally relative to the lower mattress, which is convenient for patients to be transferred from the transfer bed to the ordinary hospital bed.

The invention relates to a double-guide and controllable damping shock absorber for automobiles, comprising an oil storage cylinder cover, an oil storage cylinder sub-assembly and a linkage sub-assembly in the oil storage cylinder sub-assembly, wherein one end of the linkage sub-assembly in the oil storage cylinder sub-assembly is provided with a piston sub-assembly and a compression valve sub-assembly, and the other end of the linkage sub-assembly in the oil storage cylinder sub-assembly is provided with a guider oil seal sub-assembly. As impurities, such as sands, are discharged through via holes, the cylinder wall of an oil storage cylinder cannot be worn. Therefore, the shock absorber becomes firmer so as to achieve slower buffering and stable shock absorption.

The invention provides an acid-resistant and alkali-resistant light conveying belt. A middle layer of the acid-resistant and alkali-resistant light conveying belt is made of alkali-free glass fibers. Aramid fiber layers are arranged on the two sides of the alkali-free glass fibers. Covering rubber layers composed of epoxy resin materials are arranged outside the aramid fiber layers. Buffer layers composed of nylon polyester eyelet fabric are arranged in the covering rubber layers on the two sides outside the aramid fiber layers. The surface layer of the acid-resistant and alkali-resistant light conveying belt is resistant to acid and alkali, and multiple layers of light materials with buffer and shock absorption structures are contained in the acid-resistant and alkali-resistant light conveying belt, so that the acid-resistant and alkali-resistant light conveying belt is resistant to acid and alkali, and shock is absorbed stably during operation.

An unloading trailer comprises a bottom plate, a wheel assembly, a stage, a jacking assembly, a cushioning assembly and a traction bar, wherein the bottom end of the bottom plate is provided with a wheel assembly, one side of the stage is articulated with the bottom plate, the other side of the stage is arranged on the bottom plate through the jacking assembly, the cushioning assembly is arrangedon the opposite side of the stage, and the traction bar is articulated with the bottom plate; The jacking assembly includes a servo cylinder, a threaded cylinder and an elastic cushion, The bottom plate is provided with threaded holes matched with the column, two threaded holes are located at two ends of the edge of the bottom plate, the servo cylinder is fixedly connected with the top end of thecolumn, a rectangular opening is arranged between the two screw holes, and the opposite end faces of the elastic cushion are fixedly connected with the bottom ends of the object stage and the rectangular opening respectively; The invention has the advantages that the parts can be transported and unloaded conveniently, and the vibration of the transported parts is stable.

The invention discloses an aircraft landing gear buffer, comprising: an outer cylinder; an inner cylinder movably arranged in the outer cylinder, and a first chamber and a second chamber whose volume changes with the movement of the inner cylinder are arranged between the inner cylinder and the outer cylinder. There is a third cavity inside the inner cylinder, at least one first damping hole is set between the first cavity and the second cavity, at least one second damping hole is set between the second cavity and the third cavity, and the second cavity There is buffer gas, and the third chamber is provided with buffer liquid; the piston assembly is located in the third chamber; one end of the moving assembly is connected to the piston assembly through an elastic member, and the other end extends out of the outer cylinder to connect with the impacted part; the moving assembly moves upward and compresses The elastic member produces elastic force for the first level of cushioning; the piston assembly moves upward to compress the buffer liquid for the second level of cushioning; the inner cylinder moves upward to compress the buffer gas for the third level of cushioning. The buffer has three levels of buffering, and automatically selects one or more levels of buffering according to the size of the impact load, which can absorb large impacts and filter small vibrations.

The invention relates to a shock attenuation device for a high-altitude dropped object, which comprises a buffering outer bag, a Ti -Ni alloy wire net, a buffering inner bag, hydraulic pipelines, an adjusting nut, a throttling nozzle, a supporting pallet and a sealing sheet, wherein the Ti -Ni alloy wire net is arranged between the buffering outer bag and the buffering inner bag, and the Ti-Ni alloy wire net and the supporting pallet are molded into a whole with a mould by technological vulcanization; the inner surface of the supporting pallet is provided with more than two hydraulic pipelines; one end of each hydraulic pipeline is communicated with the adjusting nut, while the other end is communicated with the liquid of the buffering inner bag; the adjusting nut is matched with the throttling nozzle through threads; and the outside of the adjusting nut is bonded with the sealing sheet. The shock attenuation device does not influence flight trajectory of the high-altitude dropped object, and always remains unchanged to the resistance of the dropped object in the whole buffering process so as to ensure uniform deceleration of the dropped object; and most external impact energy is dissipated in a buffering device, and almost no resilience force acts on the dropped object after the buffering process is finished.

The invention discloses a high-stability low-voltage transformer mounting base device, and relates to the technical field of transformers. The mounting base device comprises a pair of supporting plates, and damping bases are fixedly connected to the supporting plates; the cross section of the supporting plate is of an L-shaped structure, and a pair of first strip-shaped holes is formed in the supporting plate; the damping base comprises a pair of transverse plates, the transverse plates are fixedly connected between the two supporting plates, a pair of mounting plates are arranged between the two transverse plates, a pair of vertical plates are symmetrically arranged on the transverse plates, and the ends of the mounting plates are in sliding connection with the vertical plates; AND a pair of sliding rods is arranged between the two transverse plates, the two ends of the sliding rods are fixedly connected with the vertical plates, a pair of sliding blocks is slidably connected to the sliding rods, a connecting rod is hinged between the sliding blocks and the mounting plate, and a pair of springs is movably connected to the surfaces of the sliding rods. The damping bases is fixedly connected to the supporting plates, the transformer is fixed to the damping bases, and the transformer is fixed through the limiting plate, so that the purpose of damping stabilization is achieved.

The invention relates to a double-cover type rear shock absorber comprising an inner cover and an outer cover. A cover body of the inner cover is located in a cover body of the outer cover, the inner cover is provided with an outer bottom edge extending outwards, the outer cover is provided with an inner bottom edge extending inwards, the outer bottom edge of the inner cover and the inner bottom edge of the outer cover are in contact and sealed with each other, the outer side of the inner bottom edge of the outer cover is connected with an aluminum ring, a spring is mounted in a cavity formed by the outer side of the cover body of the inner cover and the inner side of the cover body of the outer cover, and the cover body of the inner cover is longer than the cover body of the outer cover. The double-cover type rear shock absorber is in a double-cover form of the inner cover and the outer cover, and the spring is effectively protected and not easy to contort and deform since the spring is mounted in the cavity formed by the outer side of the cover body of the inner cover and the inner side of the cover body of the outer cover. In addition, by the design of a nut and a shock pad, the rear shock absorber is smooth and steady in shock absorption and good in shock absorption effect.

The invention discloses a projector anti-interference heat-dissipation device. The projector anti-interference heat-dissipation device comprises a projector shell, wherein a left side face of the projector shell is fixedly connected with a bearing; a revolving shaft is arranged in the bearing in a sleeve joint way; an outer surface of the revolving shaft is fixedly connected with a cover body; a bottom end of the cover body is overlapped with the left side face of the projector shell; and the left side face of the projector shell is provided with a first through hole. Through arrangement of aswitch, a suction fan, a micro-servo motor and a filter screen in the projector anti-interference heat-dissipation device, people can control working of the micro-servo motor by operating the switch,and noise generated by the vibration of the micro-servo motor during working is lowered. After finishing of work, the switch is turned off to stop the motor from working. When dust adhering to the filter screen needs to be cleaned, the cover body is rotated and the filter screen is pulled out for cleaning, so that the filter screen is very convenient to clean. Moreover, noise generated by the vibration of the micro-servo motor for heat dissipation of a projector during working can be lowered, so that the environment in which the projector is used is more comfortable.

The invention discloses an agriculture overhead ventilation damping distribution box comprising a shield top plate, a power distribution box body, a foundation pile and a support seat; the support seat is arranged on top of the foundation pile; a support standpipe is fixed on the top center of the support seat; the shield top plate is fixed on top of the support standpipe; a lightning rod is arranged on the top center of the shield top plate; the power distribution box body is respectively arranged on left and right sides of the support standpipe; two sides of lantern rings on the support standpipe are respectively correspondingly fixed with outer side walls of the power distribution box body; a plurality of damping springs are arranged on the bottom of the power distribution box body; anair outlet is arranged on top of the power distribution box body; an air inlet is arranged on the bottom of the power distribution box body; the air inlet is connected with an elastic bellows; the bottom of the elastic bellows is connected with the top of an air inlet branch; the bottom of the air inlet branch is connected with an air inlet main pipe; the other end of the air inlet main pipe is connected on the air outlet of a blower. The agriculture overhead ventilation damping distribution box is novel in structure, good in ventilation heat radiation effect, and has certain damping effects.