124 results about "Airflow orifice" patented technology

The invention relates to the technical field of rotary table welding, in particular to a welding method based on a large-table-board and large-bearing-tonnage rotary table. The method comprises the steps that blanking, beveling, welding and leveling are conducted on a target bedplate according to a preset bedplate splicing position, welding, annealing aging treatment and machining are conducted on a target sliding rail according to a preset sliding rail tailor-welding position, and the welded target bedplate, the target sliding rail, transverse and vertical rib plates with preset welding shrinkage and air flow holes and main basic components are welded into a whole; welding points are fixedly assembled to form a rotating table body, welding rib plates are reinforced to connect welding seams, the table plates are removed, the rotating table body of the welding tool support is welded according to the welding sequence, the tool support is detached, the welding seams between the target table plate and the rotating table body are welded, and an upper cover plate is welded to the rotating table body. And carrying out annealing aging treatment after welding. According to the welding method, the welding quality of the sliding rail and the rib plate and the stability of a machined finished product of the rotating table are guaranteed.

The invention discloses surrounding welding equipment for liquid level meter outer barrel machining, and relates to the technical field of liquid level meter outer barrel machining and welding. The surrounding welding equipment for liquid level meter outer barrel machining comprises a containing frame, the top of the containing frame is fixedly connected with a welding part, the inner top of the containing frame is fixedly connected with a power part, the top of the power part is rotationally connected to a workbench, and the top of the containing frame is fixedly connected with a guiding mechanism. According to the surrounding welding equipment for liquidometer outer barrel machining, by arranging the guiding mechanism composed of the draught fan, the airflow pipe and the airflow difference assembly, the equipment can actively generate and guide airflow near a welding point, on one hand, the airflow generated by the draught fan is directly blown through the airflow pipe, smoke generated by welding is blown away from a welding area, and on the other hand, by means of the Bernoulli principle, the welding efficiency is greatly improved; and airflow flowing at a high speed in the airflow bin forms a negative pressure area through airflow holes in the wall surface of the airflow bin.

The invention relates to the technical field of bladeless fans, in particular to a bladeless fan and a temperature control method thereof.The bladeless fan comprises a base, a filter screen is movably connected to the base, a drawer is fixed to the filter screen, a plurality of sets of ice crystal boxes are movably connected to the drawer, a limiting mechanism is arranged between the base and the filter screen, and a plurality of sets of air inlet holes are formed in the filter screen and the drawer; the ice crystal box has the beneficial effects that the ice crystal box is taken out of the base and put into a refrigerator to be frozen for six hours, so that the ice crystal box stores enough cooling capacity, then the ice crystal box is put back into the drawer and put back into the base, and when the motor is powered on to drive the impeller to rotate, air enters the ice crystal box containing groove from the air inlet hole and makes contact with the ice crystal box; the cooling capacity stored in the hydrogel in the ice crystal box is transmitted to the air, so that the air is cooled, the cooled air is pressurized by the impeller, blown into the air pipe from the airflow hole and then exhausted through the exhaust hole, the function of controlling the indoor temperature to be reduced is achieved, and a better cooling effect is provided for a user.

The invention belongs to the technical field of electroacoustics, and particularly relates to a sound production device and electronic equipment, the sound production device comprises a shell and a sound production monomer and a breathable separator which are arranged in the shell, the sound production monomer is matched with the shell to define a front sound cavity and a rear sound cavity in the shell, the rear sound cavity is filled with molecular sieve powder particles, and the breathable separator is arranged in the shell. The breathable separator is used for separating the molecular sieve powder particles from the sound production monomer, the breathable separator is a nuclear track membrane, the nuclear track membrane is provided with a plurality of breathable micropores, each breathable micropore is provided with an airflow pore channel penetrating through a membrane body, and an inclination angle alpha and 0 degree lt is formed between the extension direction of at least part of the airflow pore channels and the thickness direction of the membrane body in the flowing direction of airflow; [alpha] [lt]; and 90 degrees. According to the sound production device, under the condition that the required ventilation volume is achieved, molecular sieve powder particles can be more effectively isolated and protected, and the powder particles are prevented from leaking to pollute the sound production monomers.

The present application relates to the technical fields of oil extraction safety valve, more particularly to a kind of underwater pressure balanced gate valve for deep-sea oil extraction operation, including gate valve body, the gate valve body includes valve body main body, fluid passage is arranged at the both ends of the valve body main body, fluid passage is arranged with valve plate moving cavity in the middle part, gate plate is installed in the inside of valve plate moving cavity, two air flow holes are arranged in the both sides of valve plate moving cavity, air flow hole is communicated with pressure chamber in the other end, air pressure plate is installed in the inside of pressure chamber;The present application is provided with sealing air bag, it is favorable when gate plate is closed, partial pressure groove negative pressure area disappears, triangular arc groove is preset with sealing air bag, and it is expanded under the action of pressure chamber high pressure, and it is formed dynamic sealing by being closely attached to gate plate;Meanwhile, through sealing air bag and crude oil self-lubricating effect, realize high sealing property and wear resistance under high pressure, it is suitable for deep-sea oil well wellhead valve and other high pressure working conditions, significantly improve the reliability and service life of valve under extreme environment.

The present application relates to an atomizer and an electronic atomization device. The atomizer comprises an oil cup and an atomization assembly, the atomization assembly comprises a bottom assembly, a top assembly mounted to the top end of the bottom assembly, and a heating assembly clamped and positioned between the bottom assembly and the top assembly, and is provided with an airflow channel penetrating through the top assembly and the heating assembly from top to bottom; the top assembly is mounted into the oil cup and is in sealing connection with the inner wall of the oil cup, the top assembly is provided with a liquid inlet channel for providing atomization liquid in the oil cup to the heating assembly, the heating assembly comprises an oil guide body and a heating body stacked together, the oil guide body is connected with the liquid inlet channel and has a first airflow hole forming part of the airflow channel, and the heating body is arranged on the side of the oil guide body away from the top assembly and bypasses the first airflow hole. The present application can reduce the generation of condensate, avoid the phenomenon of users inhaling condensate, and has fast oil supply speed and large atomization area, so as to provide users with better smoking experience.

The utility model relates to the technical field of fire extinguishing equipment, in particular to an aerosol fire extinguishing device suitable for an electric appliance cabinet, which comprises a fire extinguishing shell, a cooling ball, an aerosol grain, a left thermosensitive line and a right thermosensitive line, and a first drainage air passage, a second drainage air passage and a third drainage air passage are sequentially arranged on the inner side of the fire extinguishing shell from left to right. The first drainage air channel, the second drainage air channel and the third drainage air channel are all filled with cooling balls. The aerosol medicine column is reasonable and compact in structure, by arranging the first drainage air channel, the second drainage air channel and the third drainage air channel, after the aerosol medicine column reacts and generates an aerosol mixture, the drainage air channels can conduct flow guiding on the aerosol mixture, and therefore the aerosol mixture can flow through the drainage air channels in the process that the aerosol mixture passes through the drainage air channels. The aerosol mixture can be fully contacted with the cooling ball for a long time in a long path, the cooling effect can be improved, and the cooled aerosol mixture is sprayed out from the left airflow hole and the right airflow hole under the action of pressure to control a fire source.

The invention discloses a sound production device for an overhead air horn, which belongs to the technical field of air horns and comprises a mounting base, a sound production assembly, a protective shell and an elastic supporting piece. The mounting base is provided with the coaxial positioning part and the multiple groups of airflow holes surrounding the coaxial positioning part, and a balanced airflow path is formed in cooperation with a communicating structure of the ventilation hole, the airflow channel and the annular groove in the horn head; the annular groove and the airflow holes surrounding the coaxial positioning part cooperate to ensure that airflow is uniformly distributed along the circumferential direction of the sounding sheet, and the problem that local high-speed airflow impacts a specific area of the sounding sheet for a long time in the prior art is avoided; the conical supporting section of the mounting base is coaxially connected with the axial through section through a smooth conical surface, external compressed airflow is guided to be smoothly transited to the acoustic channel, resistance and pressure fluctuation when the airflow enters are reduced, a uniform stress foundation is provided for the sound production piece, the sound production piece is prevented from shifting due to uneven local stress from the source, and the sound production efficiency is improved. And the long-term stability of the vibration frequency is ensured.

The utility model relates to cloth chute technical field, the utility model provides a cloth chute of even unloading, it includes motor, fan blade and airflow hole. The utility model still includes transmission shaft, knock stick and push material board. In the utility model, through the mutual cooperation between the motor, fan blade and airflow hole etc. Component of even unloading mechanism, after fixing the chute through mounting plate, start motor, make its output shaft drive pivot rotation, further drive pulley no.

The utility model provides an air floating motion platform which comprises a base, a first driving part and air floating guide rails arranged at the two ends of the base in the first direction, a cross beam is arranged between the two air floating guide rails, the two ends of the cross beam are connected with air floating plates, and the first driving part drives the cross beam to move in the second direction. An opening is formed between at least one end, facing the cross beam, of the air floating guide rail and the base, the air floating plate is partially and movably arranged in the opening and faces the base, and airflow holes are formed in all surfaces of the air floating guide rail; air flow holes in the air floating plates generate air flow acting on the base and the air floating guide rails, generated upward air floating force and generated downward air floating force are matched with each other, air floating force generated by the two air floating plates in the first direction is matched with each other, the air floating plates are suspended above the base in the moving process of the cross beam, and the air floating plates do not make contact with the air floating guide rails. Friction among the air floating plate, the base and the air floating guide rail during moving is avoided, the air floating motion platform can be made to be light, and the motion speed and precision of the air floating motion platform can be improved.

The utility model belongs to the technical field of equipment detection devices, and discloses an oxygen sensor airtightness detection device which comprises a main board, a supporting frame and a detection mechanism are fixedly connected to the upper surface of the main board, the detection mechanism comprises a placement box, a second sealing plate is arranged at a groove of the placement box, airflow holes are formed in a placement groove and the second sealing plate, and the airflow holes are communicated with the airflow holes. A connecting plate is fixedly connected to the other end of the placement box, an air tightness detector is fixedly connected to the outer side of the connecting plate, an air cylinder is fixedly connected to the interior of the mounting box, the output end of the air cylinder is in transmission connection with a telescopic rod, and the other end of the telescopic rod is fixedly mounted on the upper surface of the second sealing plate. A to-be-detected oxygen sensor is placed in the placing groove, the air cylinder is used for driving the telescopic rod at the output end to move downwards, the lower end of the telescopic rod is fixedly connected to the upper surface of the second sealing plate, the second sealing plate seals the upper surface of the placing groove, and the first sealing plate and the second sealing plate are used in cooperation. And the overall airtightness detection effect of the device is improved.

The adjustable pressing device of the vertical sawing machine belongs to the technical field of vertical sawing machines and comprises an adjusting motor, the output shaft of the adjusting motor is fixedly provided with a driving stud at one end, the driving stud is movably provided with a supporting assembly outside, the supporting assembly is rotatably provided with a mounting turntable, and the upper surface of the mounting turntable is provided with an airflow hole, a chip removal saw groove and a stroke groove; in the adjustable pressing device, a plurality of adjustable pressing mechanisms are arranged in a matched mode, the traditional hydraulic workpiece positioning design is abandoned, a plurality of different positioning rollers are utilized, the direction of the positioning rollers is changed, the quick positioning of the cutting workpiece is realized, the convenience of operation is greatly improved when the cutting workpiece is installed and dismounted, the machining efficiency of the equipment can be ensured, the workpiece damage or unstable positioning caused by hydraulic positioning can be avoided, and the practical application effect of the device is greatly improved.

The embodiment of the utility model provides a miniature vacuum air pump which comprises an air collecting and exhausting assembly provided with an exhaust port and a valve plate assembly arranged on the outer side of the exhaust port to control airflow exhausted from the exhaust port, and the valve plate assembly comprises a valve plate and an umbrella pin. The valve plate is provided with an airflow hole allowing airflow to pass through and an insertion hole used for installing the umbrella pin, and the umbrella pin comprises an umbrella rod correspondingly inserted into the insertion hole and an umbrella cover connected to the end, away from the exhaust port, of the umbrella rod and used for movably sealing the airflow hole. A plurality of annular protruding ribs surrounding the umbrella rod are further formed on the surface of the side, facing the valve plate, of the umbrella cover. According to the embodiment of the utility model, when the miniature vacuum air pump sucks air and the umbrella pins fall back to clap the plate surface of the valve plate, the umbrella pins are in contact with the plate surface of the valve plate through the annular convex ribs of the umbrella covers, and the contact surface of the umbrella pins and the plate surface of the valve plate is smaller, so that the noise generated by clapping the valve plate by the umbrella pins is smaller, and the working noise of the miniature vacuum air pump can be effectively reduced.

An object of the invention is a module arrangement being arranged to a M x N matrix, N being any natural number. A fuel inlet manifold (150) and a fuel outlet manifold (152) form a fuel manifold (171) to deliver supply fuel gas (108) to the stacks and fuel exhaust gas (177) from the stacks, and the stacks been arranged in the manifold in a parallel connection from the fuel gas supply and fuel exhaust gas connection point of view. The inlet manifold (150) comprises gas flow holes of controllable sizes to the stacks (103) for forming even gas flow to the stacks, and the outlet manifold (152) comprises gas flow holes of controllable sizes to the stacks (103) for forming even gas flow from the stacks. The inlet manifold (150) comprising a connection structure (160), and a flow element (320) braking the main flow stream coming from the gas inlet connection (160), and the inlet manifold (150) comprising a gas volume (300) between the flow element braking the main flow stream and inlet manifold connection structure, and at least one of the inlet manifold and the outlet manifold comprising two layer structure comprising a gas tight cover structure (330) and inner heat insulation structure (310), and the module arrangement comprises a first gas seal (155) on the gas tight cover structure, a first electrical insulation plate (119) and a second gas seal (156) between the manifold (171) and the stack (103). On top side (122) and on bottom side (124) of the cell stack (103) the module arrangement comprises a second electrical insulation plate (114), compression structures (116) for the stacks (103), and an air side sealing structure (169) between the stacks, and each stack end plate (170) is connected with an electrical connection.

The present disclosure provides a smoking article comprising a combustible heat source, comprising: a first part containing a combustible heat source; a second part containing a tobacco material; an airflow hole extending to the upstream side of the combustible heat source from the downstream side end of the first part; and a buffer space located between the first part and the second part and connected to the airflow hole, wherein the airflow hole does not penetrate the combustible heat source. The smoking article has an effect of improving combustion persistency by using a combustible heat source to which an airflow hole is applied.

The application provides a cleaning device and a cleaning device assembly. The cleaning device comprises a housing, a side wall plate of the housing along a first direction is a bottom plate, the bottom plate is suitable for facing a surface to be cleaned, the bottom plate has spaced apart air inlets and air outlets; a walking device is installed in the housing and comprises a track, the track is arranged in the air outlet, the track has airflow holes penetrating through the track along the arrangement direction of the outer circumferential surface and the inner circumferential surface of the track; an air duct and a fan module are arranged in the housing, the fan module is used for driving fluid to enter the air duct from the air inlets; the air outlet of the air duct faces the track. In the cleaning device provided by the application, the problem of skidding of the cleaning device when walking can be at least avoided to some extent, the secondary pollution of the cleaned surface can be avoided, the self-cleaning ability of the cleaning device is improved, the cleaning efficiency of the cleaning device, the reliability of the product and the use experience of the user are improved.

The utility model relates to the technical field of deposition furnaces, in particular to a multifunctional gas dispersing device of a deposition furnace, which comprises a movable seat and a gas cover, the gas cover is movably sleeved at the top end of the movable seat, four groups of through gas outlets are arranged at the gas cover, and gas dispersing pipes are connected at the gas outlets. An air dispersing nozzle and an air dispersing port are assembled at the output end of the air dispersing pipe respectively, a flow channel is formed in the air dispersing nozzle, a fixed seat is welded in the flow channel, a blocking groove is formed in the fixed seat, a plug is movably connected in the blocking groove in a sleeved mode, a movable block is welded to the top end of the plug, and branch pipes are welded to the four corners of the top end of the air dispersing nozzle respectively. According to the multifunctional air dispersing device for the deposition furnace, the sealing ring groove is formed, the four groups of air dispersing nozzles are arranged at the bottom end of the air cover, the impact force of airflow is dispersed through the design of the movable plug and the airflow holes in multiple positions, air is automatically dispersed according to the air pressure, and therefore the risk that the internal structure is damaged by the airflow is reduced; and the problem of overpressure high-temperature airflow impact is solved.

The present application relates to the technical field of fabric drying and setting, and particularly relates to a fabric intelligent drying and setting device, which comprises a setting chamber through which a fabric to be treated is arranged, and further comprises: a suspension spreading unit installed in the setting chamber, wherein the suspension spreading unit comprises at least one group of hollow drying plate groups, each drying plate is provided with a flow guide slit, and a dynamic wave guide tensioning unit, wherein the dynamic wave guide tensioning unit comprises a group of oppositely arranged upper flow guide assemblies and lower flow guide assemblies, and each of the upper flow guide assemblies and the lower flow guide assemblies is provided with an airflow hole one; the fabric is transmitted through air cushion suspension, so that the damage of mechanical contact to fabric nap and microstructure is reduced; meanwhile, the wave-shaped pneumatic channel with dynamic adjustable wave amplitude is used to intelligently adjust the running tension without directly pulling the fabric, so that the instability and beating phenomenon of light and thin fabric in the airflow are effectively inhibited, and the stable and controllable conveying process is realized while the high quality of the fabric is ensured.

The utility model discloses a protective garment with a lens self-cleaning function, which belongs to the technical field of protective garments and comprises a protective garment body, a pair of goggles and a ventilation plug are arranged on the head of the protective garment body, a fixing frame is fixedly connected to the inner side of the goggles and located inside the protective garment body, and the ventilation plug is arranged in the protective garment body. An air bag strip is fixedly installed at the upper end of the inner wall of the fixing frame, and side grooves are formed in the inner walls of the two sides of the fixing frame. When a person wears the protective clothing for a period of time and the goggles are dirty, the person manually presses the forehead of the protective clothing, namely the upper end of the fixed frame, so that air in the air bag strip flows to the telescopic pipe through the air flow hole, the telescopic pipe extends under the stamping of air flow, and then the movable strip is driven to slide downwards along the two vertical rods; as the bottom end of the outer wall of the moving strip is provided with the extension piece, the moisturizing groove and the cleaning strip, the moving strip moves downwards along the inner wall of the goggles, and the effect that the cleaning strip cleans the inner wall of the goggles is achieved.

The utility model discloses a vibration disc with a convenient backflow structure. The vibration disc comprises a vibration source body, a feeding disc, a straight vibration track, a detection optical fiber sensor, a screening airflow hole, an extending backflow face and a guide groove. By means of the mode, the vibration disc with the convenient backflow structure achieves the effect of convenient backflow circulation of products rejected by a straight vibration rail through the arrangement of the extending backflow face, effectively simplifies the structure of the vibration disc, saves research and development and manufacturing cost, does not need manual debugging and maintenance, is simple and reliable in butt joint, and improves the working efficiency. The use safety is improved, the energy consumption of the equipment is greatly reduced, and the equipment is more energy-saving and environment-friendly.

The present invention provides a smoking article comprising a combustible heat source, comprising: a first portion comprising a combustible heat source, a second portion comprising a smoking material, an airflow aperture extending from a downstream end of the first portion to an upstream end of the combustible heat source, and a buffer space located between the first portion and the second portion and connected to the airflow aperture; the airflow aperture not extending through the combustible heat source, the smoking article having the effect of increasing the burn duration by using a combustible heat source comprising an airflow aperture.

The application discloses an ionic liquid compressor, which comprises an end cover with an air inlet and an air outlet, a base connected with the end cover, an air inlet cavity, an air outlet cavity and an air flow hole, the air inlet cavity is communicated with the air inlet, the air outlet cavity is communicated with the air outlet, the air flow hole is communicated with the air inlet cavity and the air outlet cavity respectively, an air inlet valve is arranged in the air inlet cavity, an air outlet valve is arranged in the air outlet cavity, a cylinder is connected with the base and has a first cavity, the first cavity is communicated with the air flow hole, a piston is arranged in the first cavity and is in sealing cooperation with the inner wall of the cylinder in the circumferential direction, one end of the piston close to the air flow hole is provided with a foamed metal, the foamed metal is immersed in ionic liquid, and a driving motor is arranged at the end of the piston away from the air flow hole and drives the piston to reciprocate. The application improves the overall performance and operation stability of the ionic liquid compressor.

An integrated combined type cooking and barbecuing device comprises a pot body support and a carrier placed in the pot body support, the pot body support comprises a cylindrical frame body and a supporting bottom plate, round through holes are densely distributed in the surface of the supporting bottom plate, a plurality of square cylinder bases are evenly distributed on the inner side face of the middle of the cylindrical frame body, and the square cylinder bases are fixedly connected with the cylindrical frame body in the radial direction; the supporting bottom plate is fixedly connected between the upper surfaces of the square cylinder seats, an annular sleeving gap is formed between the supporting bottom plate and the cylinder support, airflow holes vertically penetrating through the square cylinder seats are formed in the square cylinder seats, and a conical flow guide cover covering the square cylinder seats is coaxially and fixedly connected to the bottom of the cylinder support; the integrated steamer, the barbecue plate and the double-layer saucepan can be connected with the pot body support, various pots can be borne through one pot body support, diversified cooking requirements are met, the storage space can be reduced, the types and the number of cookers carried outdoors can be reduced, carrying is convenient, and outdoor field arrangement and arrangement are convenient.

A therapy light comprises a housing and a circuit board mounted within the housing and having light emitting diodes mounted thereon. Airflow apertures in the circuit board are disposed adjacent the light emitting diodes such that the front face and the back face of the circuit board are in airflow communication one with the other. The ratio of the cumulative cross-sectional area of the airflow apertures to the cumulative cross-sectional area of the light emitting diodes is greater than about 3:2. In use, a fan causes air to flow into an intake ventilation opening, from the intake ventilation opening to the circuit board, through the airflow apertures in the circuit board, and out of an exhaust ventilation opening, to thereby cool the light emitting diodes.

To provide an electronic cigarette cartridge having high productivity.SOLUTION: A cartridge for a smoking device having upstream and downstream ends of an aerosol, comprises a filter member, a base material, a lid on the upstream side of the base material, a support member provided between the filter member and the base material, the support member having an airflow through-hole in the central portion, and a transfer member which is a hollow tubular member; wherein the base material includes a filling material in which a tubular outer casing and sheet materials extending in a first direction and a second direction orthogonal to each other in the deployed state are packed inside the outer casing in a wound or folded state, and wherein the sheet material has a plurality of cut portions penetrating in the thickness direction, the cut portions being linearly formed along the first direction.SELECTED DRAWING: Figure 4A

The utility model relates to the technical field of airflow control equipment, in particular to an airflow control plate with good stability. The control panel comprises a control panel body, a plurality of airflow holes are formed in the surface of the control panel body, a plurality of fixing plates are fixedly connected to the surface of the control panel body, long rods are rotationally connected to the surfaces of the fixing plates, semicircular plates are fixedly connected to the surface of the control panel body, and mounting holes are formed in the surfaces of the semicircular plates. The long rod is rotatably connected with the inner surface of the semicircular plate mounting hole, the arc surface of the long rod is fixedly connected with an adjusting plate, the arc surface of the long rod is fixedly connected with a gear ring, the surface of the control panel body is fixedly connected with a round rod, and one end of the round rod is fixedly connected with a U-shaped frame. The problems that part of airflow control plates are not reasonable in structural design and prone to deformation or vibration when bearing large airflow impact, the airflow control precision and stability are affected, and the service life of equipment is shortened are solved.

The application relates to a mobile descaling device which comprises a vehicle body, a liquid storage tank and a gas charging and discharging assembly. The liquid storage tank is used for storing cleaning liquid and is connected with the vehicle body. Air flow holes and water flow holes are arranged on the surface of the liquid storage tank and oppositely arranged on the two sides of the liquid storage tank, wherein the air flow holes are arranged on the upper surface of the liquid storage tank. The gas charging and discharging assembly is communicated with the inside of the liquid storage tank through the air flow holes and is used for charging and discharging the liquid storage tank through the air flow holes. When the gas charging and discharging assembly charges the liquid storage tank, the cleaning liquid in the liquid storage tank is discharged from the liquid storage tank through the water flow holes under the action of air pressure. When the gas charging and discharging assembly discharges the liquid storage tank, negative pressure is formed in the liquid storage tank to suck the cleaning liquid into the liquid storage tank through the water flow holes. The gas charging and discharging assembly is used for charging and discharging the liquid storage tank, the transfer of the cleaning liquid is realized, the operation is simple and convenient, the cleaning liquid enters the liquid storage tank through the water flow holes, the cleaning liquid cannot directly contact the gas charging and discharging assembly, and the service life is effectively prolonged.

The utility model relates to the technical field of machine tool dust prevention, in particular to an air curtain dust prevention device for a machine tool spindle, and aims to overcome the defect that the machining quality and the service life of the machine tool spindle are affected due to the fact that the machine tool spindle is inconvenient to cool in the prior art. A plurality of airflow holes are formed in the air curtain annular body; the collecting box is fixedly installed on one side of the air curtain annular body, a feeding opening is fixedly formed in the top of the collecting box, a collecting cover is fixedly installed on one side of the collecting box, a collecting opening is formed in the top of the collecting cover, and the same collecting pipe is fixedly installed on the feeding opening and the collecting opening; a first through hole is formed in the other side of the collecting box; according to the cooling device for the machine tool spindle, the machine tool spindle can be cooled conveniently, so that the machining quality can be improved, and the service life of the machine tool spindle can be prolonged.

The application belongs to the technical field of cigarette processing, and particularly relates to a tobacco tow spreading device, which comprises a first-level spreading mechanism and a first-level spreading assembly. The first-level spreading assembly comprises a first clamping plate and a second clamping plate which are fixedly connected. Opposite end faces of the first clamping plate and the second clamping plate are provided with trapezoidal grooves and triangular grooves. The trapezoidal grooves are connected with the two triangular grooves through arc grooves. After the first clamping plate and the second clamping plate are clamped, the trapezoidal grooves of the first clamping plate and the second clamping plate jointly form a tow channel with a narrow lower end and a wide upper end. The triangular grooves of the first clamping plate and the second clamping plate jointly form two negative pressure chambers. The arc grooves of the first clamping plate and the second clamping plate jointly form airflow holes which are connected with the tow channel and the negative pressure chambers. A positive pressure chamber is arranged in the first clamping plate and the second clamping plate. The positive pressure chamber is connected with the trapezoidal grooves through downwardly inclined air inlet holes. The first-level spreading mechanism can realize posture stabilization of sheet-shaped tow and comprehensive spreading in the state.

The utility model relates to the technical field of elevator cars, and discloses an elevator car ventilation adjusting structure which comprises an elevator car body, the top of the elevator car body is in threaded connection with a filter box, a sliding groove is formed in the filter box, and the interior of the sliding groove is in sliding connection with a filter mechanism. The top of the filter box is fixedly connected with a ventilation opening, and a ventilation fan is installed in the ventilation opening. According to the ventilation adjusting structure of the elevator car, through the arrangement of the adjusting mechanism, when the air speed in the ventilation opening is adjusted, a driving motor in a motor box is started, the driving motor drives a rotating disc on a top rotating rod to rotate on the surface of a fixed disc, and circulating holes formed in the surfaces of the rotating disc and the fixed disc are staggered; and therefore, the effect of adjusting the air speed in the ventilation opening is achieved, adjustment can be carried out according to the actual situation, and the flexibility of equipment is improved.