270 results about "Air flow control" patented technology

The invention discloses an air-fuel ratio control method for a high-pressure direct injection engine in a diesel-natural gas dual-fuel cylinder, and relates to the technical field of engine control, and the air-fuel ratio control method comprises the following steps: collecting diesel mass flow, natural gas volume flow and natural gas component data, and determining a diesel-natural gas mixing ratio; a basic target air-fuel ratio is obtained by combining the real-time rotating speed of an engine, the load and the diesel oil-natural gas mixing proportion; based on the pressure and temperature of the intake manifold and the rotating speed of the engine, the target air-fuel ratio after model correction is obtained; the working condition load change rate is detected, the pre-optimized air-fuel ratio trajectory MAP is called, and a transient correction target value is generated; calculating the deviation between the transient correction target value and the measured value of the air-fuel ratio sensor and the deviation change rate, and outputting an air-fuel ratio correction value; and the final target air-fuel ratio is calculated and sent to an air flow control valve to execute air inlet adjustment. The method is suitable for engine application scenes requiring high-precision and self-adaptive control to improve combustion efficiency and reduce emission.

The invention discloses a hollow-core optical fiber microstructure size dynamic nondestructive measurement and control system, which is characterized in that a spectral confocal detection module acquires spectral signals reflected by each interface of the cross section of a hollow-core optical fiber from the side surface of the hollow-core optical fiber by using a dispersion confocal principle in a hollow-core optical fiber drawing process, and converts the spectral signals into spectral data; the data analysis module outputs an axial peak value calculated value by using a neural network model according to the spectral data, and converts the axial peak value calculated value into the diameter of a nested glass tube in the nested structure unit; the regulation and control module outputs an airflow regulation instruction according to the difference between the diameter of the nested glass tube and a preset value; the airflow control module adjusts the size of airflow entering the hollow-core optical fiber according to the airflow adjusting instruction, and then the diameter of the nested glass tube is adjusted. According to the invention, the diameter of the nested structure unit in the hollow-core optical fiber can be accurately measured in the production process, and the technological parameters can be adjusted in time according to the product state.

Air flow control insertable into an air opening for controlling air flowing along an air flow direction, with a closure device including a cloth or fabric adjustable between an opening position releasing the air opening and a closing position at least partially closing the air opening by means of an adjustment device for selectively releasing and closing the air opening to change the air resistance and / or for thermal management of a downstream unit in the air flow direction. Various solutions are proposed to integrate the air control system in or behind an air grille, especially in very limited installation space.

The invention discloses a high-temperature-resistant maintenance-free nano dust filtration system and method, and belongs to the technical field of dust filtration systems. The system comprises a dust filtering main body, a nano ceramic filter element assembly, an automatic blowback system and a control system. The nano ceramic filter element is sequentially provided with an outer coarse filter layer, a middle medium filter layer and an inner fine filter layer from outside to inside, so that a radial gradient aperture structure is formed, and graded interception of dust is realized. The automatic blowback system is configured in a way that double electromagnetic pulse valves are connected in series to form double-peak collaborative blowback airflow which is firstly subjected to high-pressure impact stripping and then is subjected to high-flow removal. The control system continuously collects pressure difference data and calculates the pressure difference change rate, the remaining time for reaching a pressure difference threshold value is predicted according to the pressure difference change rate, the back flushing triggering opportunity is judged, self-adaptive dust removal control is achieved, meanwhile, the pressure difference recovery rate before and after back flushing is calculated, and back flushing parameters are automatically adjusted. According to the invention, high-efficiency purification of high-temperature dust-containing gas and long-term maintenance-free operation of the system are realized, and the service life of the filter element is remarkably prolonged.

The invention relates to the related technical field of intelligent equipment, in particular to a row type suction cup mechanical arm for processing and transferring large whole glass, which comprises a mechanical combined arm, a base, a left bracket, a right bracket, a suction cup module, an intelligent sensing module, an air blowing module, a closing switching module and a swing switching mechanism. According to the invention, through multi-mode and self-adaptive airflow control, the problem of glass adhesion caused by atmospheric pressure difference is solved. According to the application, the action combination of small-amplitude translation and overturning is utilized, and the switching of'gentle wind 'and'strong air knife' is matched, so that the generated high-speed air knife is accurately and powerfully blown into a gap, a water film is instantly destroyed, the pressure difference is efficiently eliminated, the adhesion phenomenon between the glass is eliminated at the moment when the glass is overturned to generate the gap, and the transportation work is smoother.

The application discloses an air intake flow control method and device, electronic equipment and a storage medium. The method comprises the following steps: monitoring the air flow in real time through an air flow sensor and monitoring the pressure difference before and after the filter screen in real time through a pressure difference sensor; determining the pressure difference threshold corresponding to the current air flow based on a preset first corresponding relationship between the air flow and the pressure difference threshold; when the current pressure difference corresponding to the current air flow is less than or equal to the pressure difference threshold, determining the first flow compensation value corresponding to the current pressure difference based on a preset second corresponding relationship between the pressure difference and the flow compensation value, and compensating the current air flow based on the first flow compensation value. Thus, when there is foreign matter in the filter screen in the existing steady flow pipe, the pressure difference changes greatly, the measured air intake flow is less accurate, and the problems of black smoke and insufficient power of the vehicle are caused.

This invention relates to an air flow open-loop control system (20) with the ability to correct for non-linearity in a non-linear actuated damper, resulting in improved precision and less pressure variations when controlling multiple face-dampers (31) and bypass-damper (52) The controller includes a processor that receives data on the damper's position and determines the non-linearity of the damper. The correction module then corrects for this non-linearity so that the damper can be used to steer a linearly proportional air flow based on a linear control signal. The correction module generates a corrected signal for the damper that is indicative of the desired position for the damper that will result in the desired air flow. In operation mode, the processor uses this corrected signal to control the damper and produce a linearly proportional air flow. This invention enables more precise control of HVAC air flow and ensures that non-linearity in the damper does not affect the system's performance.

This invention discloses a temperature- and humidity-controlled recirculating wind tunnel for sandstorm environments, relating to the field of wind tunnel technology. It includes a wind tunnel structure, an airflow pitch guiding mechanism, a sandstorm control mechanism, and a wind tunnel airflow control mechanism. The wind tunnel structure comprises an experimental section. The right end of the experimental section is connected to the bottom end of the sand control section via a diffusion section. The top end of the sand control section is connected to the right air inlet of a recirculating fan. The left air outlet of the recirculating fan is connected to the top end of a control section via a recirculating section. The bottom end of the control section is connected to the left end of the experimental section via a contraction section. The airflow pitch guiding mechanism is installed at both ends within the experimental section. The sandstorm control mechanism includes a sandstorm filtration component and a sandstorm collection component. The sandstorm filtration component is installed in the middle of the sand control section, and the sandstorm collection component is installed at the bottom of the sand control section. This temperature- and humidity-controlled recirculating wind tunnel for sandstorm environments has good filtration performance, preventing sand particles from clogging the mesh of the filter screen. The airflow within the experimental section can flow from left to right or from right to left.

Air conditioning system for a vehicle with an idle-stop function, comprising: an indoor / outdoor air ratio control device (21a, 21b, 28) for controlling an introduction ratio between indoor and outdoor air, wherein the indoor / outdoor air ratio control device (21a, 21b, 28) is installed in a vehicle with an idle-stop function of an engine (11) and has an indoor / outdoor air flap (21a) for switching indoor and outdoor air, which is arranged in an air conditioning duct, which introduces outdoor air from outside a vehicle interior via an outdoor air inlet (21i) and indoor air from inside the vehicle interior via an indoor air inlet (21j) and discharges the outdoor and indoor air into the vehicle interior via a nozzle (21k),wherein the indoor / outdoor air flap (21a) is arranged downstream of the indoor and outdoor air inlet and comprises an indoor / outdoor air flap actuator (21b) for actuating the indoor / outdoor air flap (21a); ​​an air flow rate control device (21c, 28) arranged downstream of the indoor / outdoor air ratio control device in the air conditioning duct and which controls an air flow rate of the air to be introduced; a temperature control device (21d, 28) arranged downstream of the air flow rate control device in the air conditioning duct and which controls the temperature of the introduced air in response to activation of the motor; an air conditioning operating section (29) configured for setting the air flow rate, a temperature, and an indoor / outdoor air mode for air conditioning; and an outdoor air temperature sensing device (31) for sensing the outdoor air temperature, characterized in thatthat the air conditioning system has an air conditioning control unit (28), A / C ECU (28), for performing general control of the air conditioning system, wherein the air conditioning control unit (28) is configured, while the vehicle is in an idle-stop state and the outside air mode is set by the air conditioning operating section (29), to adjust the opening degree of the inside / outside air flap (21a) to a first predetermined opening degree (Θ1) by means of the inside / outside air flap actuator (21b), thereby causing the proportion of outside air to be higher than that of inside air when the outside air temperature (Ta) detected by the outside air temperature sensing device (31) is lower than a first predetermined temperature (T1); to adjust the opening degree of the inside / outside air flap (21a) to a second predetermined opening degree (Θ2) to cause the proportion of inside air to be higher than that of outside air,when the outside air temperature (Ta) is greater than or equal to a second preset temperature (T2), and to adjust the opening degree of the inside / outside air flap (21a) according to the outside air temperature (Ta) to a value between the first preset opening degree (Θ1) and the second preset opening degree (Θ2), when the outside air temperature (Ta) is greater than or equal to the first preset temperature (T1) and lower than the second preset temperature (T2), and the air conditioning control (28) is further configured, while the vehicle is in the idle-stop state, for the air flow control device (21c, 28) to set a blower stage of a blower unit (21c) to a preset blower stage (Lo2) when the blower stage is greater than or equal to the preset blower stage (Lo2), and to maintain the blower stage of the blower unit (21c) at the current stage when the The fan speed is lower than the specified speed (Lo2).

The invention belongs to the technical field of airflow control, and discloses a skill training evaluation and data management system based on airflow control capability, and the system comprises a data acquisition module which constructs an airflow control sequence set and extracts an intensity peak point, a stability fluctuation point and a rhythm turning point as an initial airflow feature point set; performing time sequence hierarchical division, and generating a cross-layer association chain through a layer-by-layer accumulation mode to obtain a time sequence association vector; carrying out capability migration mapping on a plurality of training ground times, introducing a migration offset coefficient for adjustment, generating a capability evolution path, and marking key turning nodes in the path; dimension integration operation is executed, and an integration granularity threshold value is dynamically set according to the number of training ground times; building a data management file exclusive to the learner based on the integration index set, filing the capability evolution path and the integration index set according to a time sequence, setting a file access key, and starting a cross-session query interface; and the convenience of data management is greatly improved.

The application provides a posture control method and system of a folding wing unmanned aerial vehicle, and relates to the technical field of aircraft control. Firstly, the application collects pressure information and strain information of the folding wing unmanned aerial vehicle, and determines whether the wing has aerodynamic-elastic coupling during the action according to the two kinds of information. Then, when it is determined that the aerodynamic-elastic coupling occurs, the airflow control instruction corresponding to the current coupling state is determined. Then, according to the airflow control instruction, the asymmetric additional airflow on the wing surface is generated by controlling the pulse jet execution mechanism. Finally, the compensation moment is generated by the additional airflow to offset the body posture disturbance caused by the target action of the folding wing unmanned aerial vehicle. The technical scheme provided by the application not only realizes the real-time perception, accurate judgment and active inhibition of the nonlinear aerodynamic-elastic coupling disturbance of the folding wing unmanned aerial vehicle during the shape conversion process, but also improves the stability of the flight posture of the folding wing unmanned aerial vehicle.

The invention relates to a device for utilizing the heat produced by an electronic device for heating the passenger compartment of a motor vehicle. The device (2) comprises a duct (4) extending from a proximal end (6) adapted to recover at least a portion of a heat-enriched airflow produced by an electronic device (12), to a first distal end (8) allowing the flow of heat-enriched air produced by the electronic device to the passenger compartment of a motor vehicle. Control means present in the duct (4) allow the heat-enriched airflow in the duct to be controlled. A control unit (20) operates these control means based on the temperature of the airflow and the temperature of the passenger compartment, measured respectively by a first (28) and a second (30) temperature sensor. A second distal end (10) allows the airflow to be discharged from the passenger compartment when heating is not required.Figure 1.

Ventilation device (1) of a vehicle, comprising: an air outlet (10, 30, 70, 80, 90) which is mounted in a passenger compartment of the vehicle and which has an air outlet (11, 31) for releasing an airflow into the passenger compartment, an adjustment device (20, 40) which is arranged in a flow path of the airflow upstream of the air outlet (11, 31) and which is configured so that the strength and / or direction of the airflow to be discharged from the air outlet (11, 31) can be configured with the adjustment device (20, 40), a sensor device (50) which is mounted in the passenger compartment and arranged and configured to detect the presence of an object in a predetermined area in the passenger compartment, and a control device (60) which is connected to the adjustment device (20, 40) and the sensor device (50) and which is configured to determine a position of the object in relation to the air outlet (11, 31) based on a detection signal issued by the sensor device (50) and a predetermined arrangement position of the sensor device (50) and to control the adjustment device (20, 40) to configure the airflow based on the position of the object, and the control device (60) is configured to determine, based on the object's position, whether the object is located within a possible flow range of the airflow within the configurability of the airflow direction, and to actuate the adjustment device (20, 40) to reduce the strength and / or change the direction of the airflow if the object is located within the possible flow range, the adjustment device (20, 40) is configured to determine a current strength of the airflow for output from the air outlet (11, 31), characterized in that the control device (60) is configured, when the object is located within the possible flow range of the airflow, to determine a current airflow probability of the object being exposed to the air outlet (11, 31) based on the object's position relative to the air outlet (11, 31) and the current strength of the airflow, and to actuate the adjustment device (20, 40).40) to reduce the strength of the airflow in such a way that the strength of the airflow is reduced more the greater the current probability of air flowing towards the object.

The various embodiments described herein include methods, devices, and systems for operating an air-moving chamber fluidically coupled with a refrigeration system. A system includes a refrigerant loop, a second air-mover, a first air-mover, an air-moving chamber, a first airflow-control door, a second airflow-control door, and a controller. The air-moving chamber includes an adjustable door, a plurality of inlets, and a plurality of outlets. The air-moving chamber fluidically couples the second and first air-movers such that actuation of the adjustable door controls a first amount of air directed towards the second air-mover via a first inlet of the plurality of inlets and a first outlet of the plurality of outlets, and a second amount of air directed towards the first air-mover via a second inlet of the plurality of inlets and a second outlet of the plurality of outlets. The controller selectively controls operation of the compressor and / or the adjustable door.

This application provides a processing apparatus, a method for conveying stacked thin sheets, and a method for conveying and processing stacked thin sheets. The processing apparatus for stacked thin sheets is suitable for separating and processing multiple stacked thin sheets one by one. The processing apparatus for stacked thin sheets includes a body, a processing module, a carrier module, a guide unit, an airflow generating unit, and a controller. The processing module is disposed within the body. The carrier module is disposed on the body and includes a first carrier member and a second carrier member. The first carrier member has a first carrier surface. The second carrier member has a second carrier surface. The guide unit is rotatably disposed on the first carrier member. The airflow generating unit is disposed on the first carrier member and outputs airflow toward the first carrier surface. The controller is electrically connected to the processing module, the guide unit, and the airflow generating unit.

This invention discloses an adjustable valve device for ventilation ducts. The adjustable valve device includes a ventilation valve, a valve fixing frame inside the ventilation valve, a valve cylinder fixed on the valve fixing frame, a valve disc installed in the valve cylinder, a drive motor fixed to the outside of the valve cylinder, an even number of hinge ears installed on the valve fixing frame, and a swing cover connected between the hinge ears. A rear air guide tube is connected above the valve cylinder. Several fixed rods are fixed to the inner surface of the valve disc, and rod-mounted paddles are fixed to the ends of the fixed rods. A first cylinder is disposed inside the rear air guide tube, and a second cylinder is connected above the first cylinder. This invention, through the linkage design of the rod-mounted paddles at the top of the fixed rods when the valve disc swings, pushes the connecting plate to synchronously deform the air guide tube. This internal linkage structure of the valve achieves directional guidance and efficient extraction of oil fumes in the ventilation duct, significantly improving the exhaust efficiency of the valve in controlling airflow within the duct.

The invention discloses a sensor assembly control method, a sensor assembly and a control device for cooking fume equipment. The sensor assembly comprises a mounting shell, a signal collector and a first air generator. The mounting shell is arranged in a range hood of the cooking fume equipment, and the interior of the mounting shell is communicated with an inner cavity of the range hood; the signal collector and the first wind generator are respectively arranged in the mounting shell and are respectively and electrically connected with the control device; the method comprises the steps that the working state of the first air generator is controlled on the basis that whether the signal collector collects negative pressure airflow information generated when the range hood works or not; wherein when the negative pressure airflow information is not collected, the first air generator is controlled to work; and when the negative pressure airflow information is collected, the first air generator is controlled to stop working. Start and stop of the first air generator are controlled by detecting whether negative-pressure airflow exists or not, automatic switching between a positive-pressure mode and a negative-pressure mode is achieved, and the service life of the fan is prolonged.

An airflow control apparatus of the present invention is an airflow control apparatus that is provided adjacent to an upstream side of an entrance of a tenter oven in a film conveyance direction and / or to a downstream side of an exit of the tenter oven in the film conveyance direction, the tenter oven including the entrance into which a film is conveyed and the exit from which the film is conveyed, the airflow control apparatus including a blowoff nozzle, upstream-side exhaust mechanisms, and downstream-side exhaust mechanisms, in which adjustment is performed such that, when an airflow flowing from the upstream side toward the downstream side in the film conveyance direction or from the downstream side toward the upstream side in the film conveyance direction inside the airflow control while exhaust of air from the upstream-side exhaust mechanisms and the downstream-side exhaust mechanisms and blowoff of air from the blowoff nozzle are stopped is an airflow when stopping, each of an amount of air exhausted from the upstream-side exhaust mechanisms and an amount of air exhausted from the downstream-side exhaust mechanisms is greater than zero, and the amount of air exhausted from the exhaust mechanisms positioned on a side into which the airflow when stopping flows, out of the upstream-side exhaust mechanisms and the downstream-side exhaust mechanisms, is greater than the amount of air exhausted from the other exhaust mechanisms.

This invention relates to an apparatus and method for processing powder using an atmospheric pressure microwave plasma torch, belonging to the field of materials science and engineering. The invention includes a microwave plasma system, a pneumatic conveying system, a pneumatic control system, a feeding hopper, and a processing system. The pneumatic control system controls the switching of the gas storage container and the flow rate of the working carrier gas in the pneumatic conveying system. The microwave plasma system is connected to the reaction chamber of the processing system. The processing system is connected to a vacuum gauge and vacuum valves. The working carrier gas in the pneumatic conveying system is delivered to the discharge tube of the microwave plasma system via the pneumatic control system and the pneumatic conveying system to process the powder. This invention delivers the powder to the near-afterglow region of the microwave plasma discharge, reducing mutual interference caused by coupling effects. Furthermore, powder processing and collection are performed simultaneously during the operation of the plasma torch, enabling large-scale powder processing. The apparatus is simple, reliable, economical, and has high processing efficiency and microwave energy utilization.

A system for a vehicle includes an air conditioning system, a motorized directional air flow control feature, a display, and a controller configured to initiate a variable air flow routine. Initiation of the variable air flow routine prompts execution of a predetermined actuation sequence of the motorized directional air flow control feature such that the direction of air flowing from the air conditioning system into a cabin of the vehicle is varied sequentially by the motorized directional air flow control feature. Initiation of the variable air flow routine further prompts the display to display an air flow graphic having a directional quality that corresponds with the orientation of the motorized directional air flow control feature such that the directional quality of the air flow graphic varies sequentially with the direction of the air flowing from the air conditioning system.

This air-conditioning device for vehicle comprises an air-volume control unit that controls an air volume of air blown into a vehicle cabin on the basis of at least a set temperature set by a temperature setting means and a temperature in the vehicle cabin acquired by a temperature detection means, in which the air-volume control unit includes, as a plurality of selectively executable control modes, a first control mode in which a relationship between the set temperature and the temperature in the vehicle cabin and a degree of the air volume is defined, and a second control mode in which the relationship between the set temperature and the temperature in the vehicle cabin and the degree of the air volume is defined to be different from that in the first control mode.

Rapid detection of gases in the environment. [Solution] An electronic nose according to one embodiment includes an air supply unit, a detection unit, a purification unit, an extraction unit, and a control system. The air supply unit introduces an external gas. The detection unit includes a chamber, a circulation pipeline, and a detection module. The circulation pipeline transports a circulating airflow to clean the chamber. The air supply unit transports an external gas awaiting detection. The purification unit is located inside the chamber and includes a carrier, a photocatalyst, and a light-emitting element. The extraction unit is connected to the circulation pipeline and forms a circulating airflow by generating negative pressure in the chamber. The control system is connected to the detection module and receives a detection signal generated by the detection module.

The application provides a control instrument for detecting the strength of molding sand and relates to the field of molding sand detection. The control instrument for detecting the strength of molding sand comprises a base, the inside of the base is divided into an airflow control cavity and a heat dissipation cavity by a partition plate, an air outlet channel is installed on the front side of the right end of the base, an air outlet groove is fixedly connected to the side of the airflow control cavity close to the air outlet channel, the inside of the air outlet groove is in communication with the air outlet channel, a piezoelectric valve is installed above the airflow control cavity, and a strength pressure transmitter is installed above the heat dissipation cavity. The piezoelectric valve and the airflow control cavity are added to the inside, the airflow control of the piezoelectric valve is more convenient, the operation stability is improved, when the test is stable, the piezoelectric valve can be closed and the control valve can be opened, the airflow directly enters the air outlet groove from the air inlet groove and is discharged, the consumption of compressed air can be greatly reduced, the energy consumption is reduced, and the operation cost of enterprises is reduced.

The invention provides a compressor air suction valve plate, an airflow control assembly, a compressor and refrigeration equipment, and relates to the technical field of compressors. And the at least two valve flaps are arranged in the air inlet holes and cover part of the air inlet holes, the multiple valve flaps are arranged in the circumferential direction of the air inlet holes at intervals, one ends of the valve flaps are connected with the valve plate base body, the other ends of the valve flaps extend towards the centers of the air inlet holes, and the valve flaps can swing in the axial direction of the air inlet holes under the action of suction airflow so as to open or close the air inlet holes covering part of the air inlet holes. The multiple valve tongues share airflow pressure together, stress is prevented from being concentrated at one point, the risk of fatigue damage is reduced, and the service life of the valve tongues is prolonged. And meanwhile, the single-time air suction amount can be improved, and the refrigerating capacity and energy efficiency of the compressor are improved.

The present application relates to a kind of particle separation device based on adaptive risk control and non-equilibrium vibration, belong to fine coal separation technical field, one of the problems of low separation precision, low efficiency and high energy consumption existing in the uniform air supply and overall balanced vibration of the existing particle air separation equipment is solved.The present application includes fluidized bed bed layer, airflow control unit and non-equilibrium vibration unit;Adjustable restraint mechanism is arranged between upper movable bed layer plate and lower restraint plate, adjustable air duct is formed between adjacent two adjustable restraint mechanisms, the adjustable air duct is communicated with the air distribution hole above and the restraint hole below, when movable bed layer plate moves up and down, the opening and closing size of adjustable air duct changes accordingly;Non-equilibrium vibration unit includes a plurality of first elastic bodies with gradually decreasing elastic coefficient, first elastic body is connected with the bed layer side plate of fluidized bed bed layer, and a plurality of first elastic bodies are arranged along the direction of material layer travel.The present application realizes the non-equilibrium vibration of fluidized bed bed layer and the adjustable air supply.

The utility model relates to an altitude valve integrated cockpit suspension assembly which integrates an air shock absorber, a damping shock absorber and an altitude valve. The air shock absorber comprises an air bag and an upper cover assembly. The damping shock absorber comprises a piston cylinder and a piston rod. A valve body of the altitude valve is matched with the vibration direction through four-cavity graded airflow control (a first air inlet cavity, a second air inlet cavity and an exhaust cavity) and guide groove segmented design (air channels such as rapid inflation and slow exhaust), and a pin shaft drives a swing support to accurately open and close an air hole. Optimization comprises the steps that the sliding lengths of the air charging / discharging channels are different, and the large-aperture air inlet cavity and the small-aperture air discharging cavity cooperatively adjust the flow; a valve core moving plate sealing positioning hole and an elastic cushion enhance sealing; the positioning sleeve is concentric with the thin-wall inserting ring through the flange ring; the air bag curled edge comprises a steel wire ring for displacement resistance; a piston rod cushion and an elastic gasket are used for damping; and an emergency stopper in the air bag prevents collapse. The design realizes the self-adaptive adjustment of the height of the suspension, improves the comfort, the energy efficiency and the safety, and is suitable for vehicles with complex road conditions.

A firearm gas block assembly includes a gas block having a central bore and a retention member passage. The gas block engages a gas block journal of a barrel via the central bore. The retention member passage intersects the central bore to define an opening between the central bore and the retention member passage. A retention member within the retention member passage is moveable between first and second positions. A portion of the retention member extends through the opening when in the first position. No portion of the retention member extends through the opening when in the second position. Gas flow control discontinuities are within a surface of the gas block defining the central passage. A travel limiting member is engaged with the retention member and the gas block for limiting axial movement of the retention member to being between the first and second positions.

The utility model relates to a snore stopping pillow which comprises a lower base plate, and a plurality of air bags are fixedly connected to the middle of the lower base plate. The top of the air bag is fixedly connected with a pressure sensor; the side wall of the lower cushion plate is fixedly connected with an upper pillow inner; the surface of the lower base plate communicates with an air guide pipe. The end of the air guide pipe communicates with an air flow control assembly. A sound sensor, a pressure release valve and a micro air pump are mounted in the airflow control assembly; a plurality of rotating grooves are formed in the side wall of the lower base plate; the middle part of the rotating groove is rotationally connected with a supporting rod; the rotating groove and the supporting rod are connected through a torsional spring. Sponge is fixedly connected to the surface of the supporting rod; a supporting pillow inner is fixedly connected to the surface of the lower cushion plate. A containing groove is formed in the middle of the supporting pillow inner. The air flow control assembly is used for controlling the air bag to lift the air bag on the side in contact with the head so as to rotate the head, the head is made to lie on the side, and snoring is relieved by adjusting the posture.

The application discloses a pipe end processing machine and relates to the technical field of metal pipe processing. The pipe end processing machine comprises a processing table, a motor fixedly installed on the processing table, a saw blade rotationally connected to the motor, and a removing mechanism. The removing mechanism comprises a supporting plate and an air pump fixedly installed on the processing table. An air conveying cylinder in communication with an air outlet of the supporting plate is fixedly connected to the inside of the supporting plate. An ion generator is installed in the air conveying cylinder. An air outlet is fixedly connected to the inside of the supporting plate. The application utilizes the air pump and the ion generator to blow the airflow containing positive and negative ions to the cutting head of the saw blade, reduces the sawdust attached to the saw blade under the action of static electricity, makes the groove wall more smooth and flat after the metal pipe is cut and grooved, and further, the airflow control unit can control the airflow to be sprayed in the form of pulses, so that the ions are released to the saw blade at a high speed in a short time, the contact opportunity of the ions and the static electricity is increased, and the static electricity elimination efficiency is improved.