94results about How to "Avoid threading" patented technology

The invention discloses a kitchen ventilation system based on an air curtain and filtration. The system consists of a fresh air section, an air curtain section and an air exhaust section, wherein the fresh air section consists of a fresh air port, a PM2.5 filter, an air feeder, an injector air-supplement branch pipe and the like; the air curtain section consists of a reducing pipe, a gas stove, an angle-adjustable air curtain, a hot air curtain blowing-in branch pipe and the like; the air exhaust section consists of an exhaust hood, a one-way check valve, an exhaust fan and an air outlet; after being filtered, one path of fresh air is conveyed to the injector air-supplement branch pipe so as to be used for injection of the gas stove, one path of fresh air is conveyed to the air curtain for cooking in summer and transitional seasons, and another path of fresh air is conveyed to the hot air curtain blowing-in branch pipe so as to regulate the temperature of the air curtain and meet the heat comfort requirement of a human body; the jet current and fume of the air curtain are discharged to the outdoors by virtue of the exhaust hood. The system can be used for achieving the effects of insulating heat, reducing indoor cooling load, improving the cooking comfort degree and health degree, preventing cooking fumes from spreading into a horizontal living room, improving the combustion efficiency of the system and the like, is beneficial to formation of an open kitchen and ensures that the architectural space is fully utilized.

The invention provides a run-preventing stocking. The leg of the stocking is woven by fusible spendex by virtue of a weft knitting machine, the denier of the spendex is 8-20d, and weaving intersection of spendex is fused to be bonded and connected. The invention also provide a method for manufacturing the run-preventing stocking, comprising the following steps: weaving the leg of the stocking by virtue of the weft knitting machine, carrying out high temperature sizing at the temperature of 140-180 DEG C, and fusing the weaving intersection of the spendex to be bonded and connected. By adopting the technical scheme of the invention, bonding points in net distribution are formed on the leg of the stocking, and the bonding points can prevent a hole from expanding even if the hole appears at a certain position, thus run of the stocking is prevented; and meanwhile, the fused intersection is arranged between intersectant silks, and appropriate denier is selected, thus rapid intersection fusing and bonding can be easily realized when the stocking is manufactured, and the service life of the stocking is prolonged while the wear comfortableness of the stocking is not influenced.

The invention discloses an alternating-direct current power supply system for variable frequency equipment and a variable frequency air conditioner. The alternating-direct current power supply system comprises direct current power supply wiring terminals, alternating current power supply wiring terminals, a direct current sampling circuit and a controller; the alternating current power supply wiring terminals are connected with a direct current bus voltage input end of a first inversion unit through a first rectifier bridge; the direct current power supply wiring terminals are connected with the direct current bus voltage input end of the first inversion unit sequentially through a second inversion unit, an isolation transformer and a second rectifier bridge; and the direct current sampling circuit acquires direct current voltage input by the direct current power supply wiring terminals and outputs to the controller through the direct current isolation transformer. Since the alternating-direct current power supply system is designed, the variable frequency equipment such as the variable frequency air conditioner can be directly powered by an alternating current mains supply and a public direct current power grid or direct current energy generated by renewable energy sources; the working requirements of long-term continuous operation of the variable frequency equipment can be met; and the variable frequency equipment is greener and more environment-friendly.

The invention discloses a sustained arc high energy electrostatic igniter and a control method thereof, belonging to the technical field of electronic igniters. The electrostatic igniter comprises a charging circuit, an ignition circuit, a sustained arc circuit and a leakage circuit. The charging circuit comprises a first power supply and a second power supply; the ignition circuit comprises a high-voltage capacitor C1, a starting switch S1 and an electrode; the sustained arc circuit comprises a low-voltage capacitor C2, a sustained arc inductor L and an electrode; and the leakage circuit comprises a leakage resistor R and a leakage switch S4. High-voltage capacitor is adopted to replace an igniter of a traditional circuit, and the high-voltage capacitor C1 is adopted to discharge so as topuncture air between electrodes, therefore, the energy released by generated electric spark can be up to more than 8000J currently, and the ignition energy of traditional electric igniter is improved; the diode in a traditional sustained arc circuit is removed, an inductance component L is placed in the sustained arc circuit, thereby preventing high-voltage pulse generated by the ignition circuitfrom being connected in the sustained circuit in series, so that the air between the electrodes can not be punctured. Compared with the traditional way, the invention is safer, more convenient and more reliable.

The invention discloses a kitchen ventilation system based on an air curtain and filtration. The system consists of a fresh air section, an air curtain section and an air exhaust section, wherein the fresh air section consists of a fresh air port, a PM2.5 filter, an air feeder, an injector air-supplement branch pipe and the like; the air curtain section consists of a reducing pipe, a gas stove, an angle-adjustable air curtain, a hot air curtain blowing-in branch pipe and the like; the air exhaust section consists of an exhaust hood, a one-way check valve, an exhaust fan and an air outlet; after being filtered, one path of fresh air is conveyed to the injector air-supplement branch pipe so as to be used for injection of the gas stove, one path of fresh air is conveyed to the air curtain for cooking in summer and transitional seasons, and another path of fresh air is conveyed to the hot air curtain blowing-in branch pipe so as to regulate the temperature of the air curtain and meet the heat comfort requirement of a human body; the jet current and fume of the air curtain are discharged to the outdoors by virtue of the exhaust hood. The system can be used for achieving the effects of insulating heat, reducing indoor cooling load, improving the cooking comfort degree and health degree, preventing cooking fumes from spreading into a horizontal living room, improving the combustion efficiency of the system and the like, is beneficial to formation of an open kitchen and ensures that the architectural space is fully utilized.

The invention provides a detection circuit which is used to detect connection state between two points in a DC circuit. The detection circuit comprises a DC power supply, a first resistor for limiting current, a voltage sampling circuit and a voltage comparator, wherein the voltage sampling circuit outputs the voltage between the two ends of the first resistor or a sampling result of one end, far from the anode of the DC power supply, of the first resistor to the positive-phase input end of the voltage comparator; and the voltage comparator compares the result with a reference voltage that is input to the negative-phase end of the comparator, and outputs a corresponding signals to indicate a connection or disconnection state between the two ends of a tested device. The connection state between two points in the DC circuit can be detected, the current limiting first resistor has functions of an isolated DC circuit and a detection circuit, mechanical devices as an auxiliary contact are not needed, false detection caused by the device is low in motion speed and easy to corrode is avoided, and the accuracy of the detection result is improved.

The invention discloses an oxidized pellet production process using a chain grate-rotary kiln system, which comprises the following steps: (1) green pellets are dried, preheated and oxidized through achain grate, then materials passing through the chain grate are conveyed to the rotary kiln to be roasted and then conveyed to an annular cooler to be cooled, and pellet ore is obtained; 2) hot air exhausted from the first circular cooling section is conveyed to the rotary kiln, the hot air exhausted from the rotary kiln is conveyed to a second preheating section, and the hot air exhausted from the second preheating section is conveyed to an air draft drying section in an air draft manner; 3) hot air exhausted from the second annular cooling section is conveyed to the first preheating sectionin an air blowing manner; and 4) the hot air exhausted from the third annular cooling section is conveyed to an air blast drying section in an air blast manner. According to the scheme, hot air is blown into the first preheating section, so that the air pressure in the first preheating section is greater than that of the second preheating section, and gas in the first preheating section does notneed to be denitrified; and meanwhile, a stable hot air area is formed in the first preheating section, and the preheating effect of upper-layer and lower-layer pellets is guaranteed.

A cryostat, comprising an outer vacuum vessel containing cryogenic equipment suspended from the outer vacuum vessel by a number of suspension rods. At least one of the suspension rods is provided with a tensioning and retaining mechanism for holding that suspension rod in tension braced against a suspension bracket). This tensioning and retaining mechanism includes a tubular rod carrier arranged, in use, to pass through a hole or slot in the suspension bracket, the rod carrier having an axial bore through which, in use, the rod may pass; a thread on its outer surface along at least part of its length; and a rod bearing surface for, in use, transmitting force to the rod. This tensioning and retaining mechanism also comprises a tensioning nut threaded onto the thread so as to, in use, brace against the suspension bracket to urge the tubular rod carrier in the direction of the rod bearing surface so as to apply tension to the rod.

The invention relates to a two-to-one suspension ratio construction hoist arranged on an elevator shaft traction machine. The two-to-one suspension ratio construction hoist comprises a top beam, the traction machine, a steel wire rope, a counterweight and a car; the top beam comprises a main beam which is horizontally arranged and a telescopic beam which is inserted in the main beam in a left-right sliding manner; the traction machine is arranged in the middle of the main beam; an upper rope pressing wheel and a lower rope guiding wheel are rotatably arranged on the main beam; the upper rope pressing wheel is positioned at the upper part of the main beam and is positioned on the left side of the traction machine; the lower rope guiding wheel is positioned at the lower part of the main beamand is positioned below the upper rope pressing wheel; a car fixing end and a counterweight fixing end are arranged at the right upper part and the left upper part of the main beam; a car moving pulley is arranged at the top of the car; a counterweight moving pulley is arranged at the upper end of the counterweight; and one end of the steel wire rope is fixed to the counterweight fixing end. Thetwo-to-one suspension ratio construction hoist arranged on the elevator shaft traction machine is simple, safe, fast, low-cost, energy-saving, environment-friendly and efficient. The invention also provides an operation method of the construction hoist. The construction hoist and the operation method have high practicability, are good and are worthy of popularization.

The invention discloses a rivet inserter and relates to ligament stitching operation auxiliary apparatus. The rivet inserter comprises a thread pressing clamp seat, a spring, a fixing seat, a gripping handle and a main rod. The front end of the main rod is provided with a short circular pipe radially penetrating a cutting groove. The front end of a tubular body of the thread pressing clamp seat forms a conical face, the rear end of the tubular body is provided with a handle, and an inner hole of the tubular body is of step shape with big rear and small front. A fixing seat body is mounted at the rear portion of the main rod, T-shaped fins are disposed on two sides of the fixing seat body, and the rear portion of each T-shaped fin extends out of the fixing seat body and is provided with an inner flange on the inner surface. The front end of the thread pressing clamp seat is inserted into the two fins of the fixing seat. The gripping handle is provided with a recessed closed groove, and a stitching thread can be wound on the groove. A guide tube inserting into the rear section of the inner hole of the thread pressing clamp seat is disposed at the front end of the gripping handle. The part, located behind the fixing seat, of the main rod enters the inner hole of the thread pressing clamp seat, penetrates the spring, and is fixed in the inner hole of the guide tube. Two ends of the spring press the bottom of the rear section of the inner hole of the thread pressing clamp seat and the guide tube to allow the conical face of the thread pressing clamp seat abut against the inner flanges on the inner surface of the two fins of the fixing seat.

The invention discloses a manufacturing method and a structure for a basement floor without crack, leakage and with an oversized area. According to the method and the structure, disclosed by the invention, a concrete self waterproof floor board layer is firstly poured, and the concrete self waterproof floor layer is poured by adopting leakage resisting concrete; a drain board layer made from high impact polystyrene (HIPS) is paved on the concrete self waterproof floor board layer; then, a plain concrete leveling layer is poured on the drain board layer; a reinforced concrete layer of which the thickness is from 160 to 260mm is poured on the plain concrete leveling layer, the reinforced concrete layer is divided into small integrated reinforced concrete layers by expansion joints, and extruded polystyrene board materials are filled in the expansion joints; a polyurethane coating layer is painted on each small integrated reinforced concrete layer of the reinforced concrete layer, and silicone weather-proof glue is filled in a gap between every two adjacent polyurethane coating layers. The structure has the advantages of difficulty in sinking, no crack, no leakage and the like.

The invention relates to an elevator shaft beam for pulling an upper telescopic construction lifting machine. The elevator shaft beam for pulling the upper telescopic construction lifting machine comprises a left telescopic short beam, a main beam, a right telescopic short beam and a support beam, wherein the upper end of the support beam is fixedly connected with the right end of the right telescopic short beam so as to form an L-shaped structure; two groups of folding and positioning rod pieces are rotatably connected to the front side and the back side of the support beam respectively; theleft telescopic short beam is inserted into the left end of the main beam; and the right telescopic short beam is inserted into the right end of the main beam. The invention further discloses an installation and use method of the elevator shaft beam for pulling the upper telescopic construction lifting machine, compared with a conventional installation method, the installation and use method has the advantages of novel design, convenience in use, rapidity, easiness in operation, convenience, energy conservation, environmental friendliness and high practicability and is worthy of popularization, and the use mode of a traction machine is expanded.

The invention relates to an instantly-heating circulatory system suitable for a water heater and a control method thereof. The system and method solve the problems that in the prior art, a water heater in a heat circulatory system is frequently started, and hot water is prone to flowing into a cold water pipe. According to the technical scheme, a circulation device and a one-way valve assembly areincluded, the circulation device is mounted on a cold water pipe or a hot water pipe connected to the water heater, the one-way valve assembly is arranged at the tail end of the hot water pipe of thewater heater, a control module, a heating module in signal connection with the control module and a variable frequency water pump are arranged in the circulation device, the one-way valve assembly isprovided with a first temperature sensor, and the first temperature sensor is in signal connection with the control module. The instantly-heating circulatory system has the beneficial effect that thevariable frequency water pump and the heating module in the circulation device, a flow sensor, a second temperature sensor, the control module and the first temperature sensor on the one-way valve assembly form a closed-loop control system, and the problems that the water heater is frequently started, and hot water and cold water mixing in pipes is prone to happening are solved.

The invention relates to an instant heating circulation system suitable for a water heater and a control method of the instant heating circulation system, and solves the problems that a water heater is frequently started, and hot water flows into a cold water pipe and the like in the prior art. According to the technical scheme, the system comprises a pipeline, a circulating water pump, a circulating water pump and a flow detecting element, the pipeline is connected with the water heater, and the pipeline comprises a cold water pipeline or a hot water pipeline; the circulating water pump is arranged on the pipeline; the temperature control valve element is connected to the hot water pipeline and the cold water pipeline; the flow detecting element is installed in the pipeline and is in signal connection with the circulating water pump; the temperature control valve element is a self-operated temperature control stop valve. The instant heating circulation system has the advantages that hot water in the hot water pipe is prevented from being flow into the cold water pipe through the self-operated temperature control stop valve; the flow detecting element is used for detecting whethera circulation pipeline formed by the cold water pipeline and the hot water pipeline is smooth or not, and invalid operation of the circulating water pump is avoided; the self-operated temperature control stop valve and a one-way valve mounted at the cold water end is used for ensuring the stop valve can be opened and closed through the temperature of the tail end of the hot water pipeline in realtime, frequent starting of the water heater is avoided.

The invention discloses a mowing head and a mowing machine using the same. The mowing machine comprises the mowing head, a motor, a spool, a mowing head shell, a first guide structure and a second guide structure, wherein the motor drives the mowing head to rotate by using a first axis as the rotation axis; the spool is used for winding a mowing rope; the mowing head shell accommodates at least part of the spool; the first guide structure is formed on or connected to the mowing head shell and is used for guiding the mowing rope to penetrate the mowing head shell during threading; the second guide structure is formed on or connected to the spool; the mowing machine has a winding mode, the second guide structure is used for guiding the mowing rope to move and wind the spool through the relative rotation generated between the spool and the mowing head shell during winding. The mowing head and the mowing machine with the same are high in operation efficiency and good in user experience.

The invention provides a vehicle cable filling and sealing method. The method comprises the following steps: after being welded, wire cores are thermally shrunk by using heat-shrinkable tubes, 704 adhesives are filled at the welding positions, and curing is carried out; after the 704 adhesives are completely cured, the wire cores and shielding layers are fixed through the heat-shrinkable tubes; atail accessory is installed and fixed, 704 adhesives are filled for the second time, and the 704 adhesives are cleaned outside the tail accessory after the 704 adhesives are cured; a wave-proof sleeveis fixed at a groove of the tail accessory by using a silver-plated copper wire; and sleeving with a thermal shrinkage head is performed, and thermal shrinkage is performed. The cable filling and sealing method provided by the invention has the advantages of good sealing performance, pulling resistance and excellent electromagnetic shielding performance, and can greatly improve the reliability and electromagnetic compatibility of the cable.

The invention discloses a mixed bed regeneration method, which comprises: 1) backwashing layering; 2) sedimentation; 3) first water discharge; 4) pre-mixing; 5) first regeneration; 6) second regeneration; 7) replacement; 8) rinsing; 9) cleaning; 10) second water discharge; 11) mixing; 12) resin falling; 13) water filling; 14) positive washing and water discharge; 15) positive washing and reflux; and 16) pressure relief so as to be spare. According to the present invention, with the mixed bed regeneration method, the desalination water treatment system can have high safety and high reliability,the condition that the acid liquid crossflows into other pipelines through the valve or enters the remaining mixed beds being in the normal operation state and connected in parallel with the mixed bed performing the mixed bed regeneration process can be avoided, the phenomenon that the desalination water treatment system occurs acid crossflow can be avoided, the mixed bed regeneration effect canbe effectively improved, and the mixed bed effluent cannot be polluted.

The invention discloses a mowing head. The mowing head comprises a spool, a mowing head shell, a first guide structure and a second guide structure, wherein the spool is used for winding a mowing rope; the mowing head shell is used for accommodating at least part of the spool; the first guide structure is formed on or connected to the mowing head shell and is used for guiding the mowing rope to penetrate the mowing head shell during threading; the second guide structure is formed on or connected to the spool and is used for guiding the mowing rope to move and wind the spool through the relative rotation generated between the spool and the mowing head shell during winding; the mowing head shell comprises a first shell and a second shell, the first guide structure is formed on or connected to the second shell, the spool is arranged between the first shell and the second shell, and outer threading holes allowing the mowing rope to penetrate in or out are formed in the first shell or the second shell. The mowing head is high in operation efficiency and good in user experience.

The invention provides a device for monitoring overhead wire load currents. The device comprises a monitor arranged outside an overhead conductor. The monitor is of a split structure and is composed of an upper monitor part and a lower monitor part. The monitor is provided with a sampling silicon steel iron core, a sampling and communication circuit board, an induction energy-extracting circuit board and an induction energy-extracting silicon steel iron core. An outer shell of the lower monitor part and an outer shell of the upper monitor part are sleeved with silica gel sheaths, flexible solar panels are arranged on the outer circumferences of the silica gel sheaths, and solar terminal connecting holes are formed in the silica gel sheaths. The outer shell of the lower monitor part and the outer shell of the upper monitor part are connected through bolts. According to the device for monitoring the overhead wire load currents, data are transmitted in a wireless mode, primary isolation and secondary isolation are achieved, the flexible solar panels are embedded in the silica gel sheaths, sampling coils are provided with taps, when values of the load currents are as small as set values and the load currents are switched to high-accuracy coils, the taps are automatically switched, sampling accuracy is improved, and electric power runtime is long.

The invention provides an OLED display panel and an OLED display device, which relate to the technical field of display, and aim to improve the color saturation of the OLED display panel and prevent color crossing of the OLED display panel. The OLED display panel comprises a plurality of pixels arranged in an array, each pixel comprises at least three sub-pixels, and each sub-pixel can display light of one color; each sub-pixel comprises a light-emitting element, each light-emitting element can emit first color light, and the wavelength of the first color light is smaller than or equal to thewavelength of light which can be displayed by any sub-pixel; each sub-pixel further comprises a light condensation structure located on the light-emitting side, facing the light-emitting element, of the light-emitting element. In each pixel, quantum dots are dispersed in the light condensation structures in the at least two sub-pixels, and the quantum dots absorb the first color light emitted by the light-emitting element and emit light of one color which can be displayed corresponding to the sub-pixels. The OLED display panel provided by the invention is used for image display.

A device and process for applying a preparation fluid to an advancing thread or yarn, which includes a housing having a thread inlet opening and an thread outlet opening. A preparation device is provided in the housing for applying a preparation fluid to the advancing thread and for applying a swirling air stream against the advancing thread to cause the fluid to penetrate into the interior of the thread. The housing and the preparation device are both divided so that they may be opened to facilitate the initial thread up of the thread through the housing. Also, the inlet and outlet openings are configured to provide a seal between the advancing yarn and the housing to minimize leakage of the fluid from the housing.

The present invention relates to a glove testing device and method for air testing of gloves particularly of the insulative type used by linemen and electricians. The device may be moved relative to the lengthwise direction of the glove to successively seal shut securely each portion of the glove passed by the device so that air trapped in the glove progressively inflates the glove. In particular, the glove may be rolled about the testing or spool device starting adjacent the glove's open mouth either by rotating the device or wrapping the glove or by a combination of these movements. The device may include cantilevered arms forming a lateral gap for lateral insertion of the glove's end portion and may have rounded outer surfaces that avoid placing sharp folds in the glove during the rolling operation.

The invention provides a combined arm joint of a crane, the crane and a mounting method of the crane. The combined arm joint comprises an arm joint body (110) and a connecting part (170) arranged on the arm joint body (110), wherein the connecting part (170) is located between a first end and a second end of the arm joint body (110) opposite to each other and used for being connected with the upper end of a rotary assembly (300) of the crane; and in the arm joint body (110), a rotary tower body section (112) is formed in the connecting part (170), a balanced arm joint section (111) as a first arm joint of a balanced arm of the crane is formed between the rotary tower body section (112) and the first end, and a lift arm section (113) as a first arm joint of a lift arm of the crane is formed between the rotary tower body section (112) and the second end. According to the combined arm joint of the crane, the quantity of parts at the upper part of the tower crane is reduced and the design, manufacturing and mounting operations are simplified.

The invention provides an electric heating plate with unbalanced fins shaped like a Chinese character 'feng'. The electric heating plate with the unbalanced fins shaped like the Chinese character 'feng' comprises a substrate, wherein S-shaped electric heating tubes are cast in the substrate, air heating fins and evaporation fins are cast on the two sides of the substrate respectively, a separating plate is arranged at the front end of the substrate in an extension mode, and is used for isolation between a main ventilation area and a water mist evaporation area, evaporation baffles are arranged on the left side and the right side of the evaporation fins respectively, and the evaporation fins are thin and high. The invention further provides a heating and humidification device. The heating and humidification device comprises a heat-insulating shell, wherein an air suction inlet and an exhaust outlet are formed in the two ends of the heat-insulating shell respectively, and centrifugal fans, nozzles, the electric heating plate with the unbalanced fins shaped like the Chinese character 'feng' and a gas-and-steam mixing area are arranged in sequence from the air suction inlet. According to the electric heating plate with the unbalanced fins shaped like the Chinese character 'feng' and the heating and humidification device, the mode that operation of heating drying and operation of water supply vaporization humidification are independently carried out or are carried out in parallel is achieved, and the effects that the main ventilation area is free of water scale and the water mist evaporation area is descaled in a thermal shock mode are ensured.

The invention discloses a medical robot for myopic surgery, comprising a driving wire, and sequentially connected winding device, driving device, support plate, joint section and clamping assembly. The joint section comprises a plurality of joint units hinged in sequence by balls, and a main through hole and a lead hole are arranged on the joint unit. The head end of the joint segment is fixed onthe support plate, and the end of the joint segment is connected with the clamping assembly; the driving wire is divided into a head driving wire and a joint driving wire. One end of the driving wireis fixed on a winding device, and the other end of the joint driving wire passes through the wire holes in each joint unit in turn and is fixed on the tail end of the joint segment. The invention eliminates the defects in the prior art, and also obtains the advantages of multiple controllable directions, simple assembly, long service cycle and accurate work.

The invention discloses an equipotential intelligent conduction device for a platform door, which is characterized in that a platform door terminal is connected with a rail terminal through a first switch, a current measurement module is used for sensing a current signal on an electrical connection line between the platform door terminal and the rail terminal, the platform door terminal is furtherconnected with a grounding terminal through a second switch, the rail terminal is connected with the grounding terminal through a third switch, the first switch, the second switch and the third switch are in control connection with a PLC (Programmable Logic Controller), and the current measurement module is in control connection with the PLC. The equipotential intelligent conduction device for the platform door has the beneficial effects that the equipotential connection between the platform door and the rail can be converted from a single connection or disconnection state into an intelligentcontrol state, potential safety hazards generated by the equipotential connection or disconnection between the platform door and the rail and the insulation breakage of an internal control circuit ofthe platform door can be eliminated, the current in the state of equipotential connection between the platform door and the rail can be monitored, whether the insulation of the platform door againstthe ground is normal or not is monitored, and an alarm is provided so as to facilitate the staff to take countermeasures.

The invention discloses an independently lifting smoke exhaust machine which comprises a machine shell, an air cabinet structure and an air outlet located at the top end of the machine shell, air drums and a smoke collecting hood and an air network located at the bottom of the machine shell, wherein the air cabinet structure comprises a main motor, a motor hood shell, an air wheel and an air cabinet cover plate, a synchronous motor and at least one pulley wheel mechanism are installed in the machine shell, the synchronous motor, the pulley wheel mechanism and a driving steel rope jointly form a lifting mechanism, and the driving steel rope is connected with the air drums. The air drums is liftable, so that the smoke exhaust property of the smoke exhaust machine is high, double air drums not only are independent but also are unified, and the possibility that smoke enters the other side when a single side is independently used is avoided.

The invention discloses a pair of seamless dual-layer looped pile warm-keeping one-piece pant stockings and a production method thereof. The seamless dual-layer looped pile warm-keeping one-piece pant stockings are provided with a seamless pant waist, a seamless three pants crotch and dual-layer looped pile pant legs, wherein the seamless pant waist is knitted by an underwear machine; the seamless three pants crotch is integrally knitted by a double-needle-bar Raschel warp knitting machine; outer layers of the pant legs comprise high-density plain weaves knitted by a silk stocking machine, and inner layers of the pant legs comprise looped pile weaves knitted by a pile knitting machine. The crotch part of the one-piece pant stockings is free of any seam; the outer layers of the legs are smooth and bright, and the inner layers of the legs are warm and soft; the one-piece pant stockings have double effects of attractive appearance and warm-keeping interior, so as to be suitable for external wearing.