89results about How to "No accident" patented technology

The invention relates to a fully mechanized coal face bracket withdrawing method and a withdrawing bracket traction spring exerciser, in particular to a process for withdrawing a bracket after the backstoping of a working face is finished in a mine, and the traction spring exerciser used in the withdrawing process. The traction spring exerciser comprises a section of beam fixed with a traction pulley, wherein the middle part of the beam is provided with a tie beam which is vertical to and fixedly connected with the beam; the other end of the tie beam is fixedly connected with a short beam; the short beam is parallel to the beam and forms a door shape with the beam and the tie beam; a width at an opening of the door shape is matched with a base of a hydraulic bracket; and a position, matched with a pin hole on a cylinder lever head part of a traction cylinder of the hydraulic bracket, on the middle part of the tie beam is provided with the pin hole. In the fully mechanized coal face bracket withdrawing method, the traction spring exerciser is utilized, and a cylinder lever of the traction cylinder which cannot be subjected to a radial force originally is used for transversely pulling the hydraulic bracket, so the whole withdrawing process is very simple, manpower and materials are saved and withdrawing security is ensured.

The invention provides an EPB (electronic parking brake) system, which comprises a driver detection unit, a master control unit, a signal trigger unit, a brake control unit and a brake unit. The driver detection unit is used for detecting whether a driver is seated on a driving seat or not, the master control unit is used for controlling the signal trigger unit to trigger electric signals when the driver detection unit detects that the driver leaves the driving seat, and the brake control unit is used for controlling the brake unit to brake according to the electric signals triggered by the signal trigger unit. Using the EPB system can automatically brake an automobile without any operation when the automobile is parked and the driver leaves, so that the problem that the driver forgets to start the EPB system is avoided.

The present invention relates to a universal charger that can charge rechargeable batteries of different charge conditions like Ni-Cd, Ni-MH and Li-ion etc. The universal charger comprises a cylindrical charging device for rechargeable batteries, a square charging device for rechargeable batteries, and a movable AC input plug-chip, wherein the cylindrical charging device for rechargeable batteries and the square charging device for rechargeable batteries share one charger shell, characterized in that the cylindrical charging device for rechargeable batteries and the square charging device for rechargeable batteries share one charging circuit, and the charging circuit comprises a AC / DC controller and a charge controller, wherein the charge controller comprises a DC / DC pressure regulation appliance, a battery recognition device and a charging current control device, AC of 100V-240V is converted to DC of 0V-15V through a AC / DC controller and then transmitted to the charge controller; the battery recognition device recognizes charge voltage of charging battery connected on the charger and charging current that matches with the charge voltage; the DC / DC pressure regulation appliance converts input voltage into the charge voltage for output; and the charging current control device converts the input current into the charging current for output.

The invention provides an aircraft pathway running takeoff and landing assisting device, belongs to the field of machinery, and relates to the techniques of carrier aircraft takeoff and landing. An existing carrier aircraft landing assisting device in foreign military adopts the hydraulic arresting landing techniques, and an MK7 hydraulic arresting device is most typical especially. However, defects exist in the design of the MK7 hydraulic arresting device, and accident rate is high; it is as difficult as dancing on a blade for pilots to learn the technique, as they said. Finding another way, according to the aircraft pathway running takeoff and landing assisting device, the process of a carrier aircraft landing is divided into six steps, namely landing, hooking, binding, taxiing, decelerated taxiing and stopping; landing, hooking and binding are performed simultaneously, the left three steps are performed on the pathway in a limited manner, once hooking is successful, successful landing is guaranteed, the aircraft is prevented from deviating the pathway in the taxiing process to trigger an accident, and landing success rate is higher than that of the MK7 hydraulic arresting device. The aircraft pathway running takeoff and landing assisting device can also assist the carrier aircraft in taking off.

The invention discloses a hydrogen eliminating test system with a safety protection function. The hydrogen eliminating test system comprises a tank body, a hydrogen supply device, an oxygen supply device, a nitrogen supply device, a cooling device, a detection device, a temperature control device, an air compressor, a steam generator, a data collection control module, an anti-explosion sheet and a safety valve. The hydrogen supply device supplies hydrogen to hydrogen eliminating reactions of a passive autocatalytic recombiner (PAR) in the tank body; the oxygen supply device supplies oxygen to the hydrogen eliminating reactions; the air compressor, the steam generator and the temperature control module stimulate the high-temperature, high-humidity and the high-pressure environment of a nuclear power station; the detection device can monitor relative parameters of a test process according to the test requirements; and the data collection control module collects parameters of all detection points in a collection system and adjusts the aperture of an adjusting valve in a parameter control system. A spraying device can stimulate the spraying environment of the scene of the nuclear power station. For ensuring safety operation of the system, the anti-explosion sheet and the safety valve are arranged on the outer circumference of an upper end socket of the tank body, pipelines of the nitrogen supply device are normally opened, and pipelines of the hydrogen supply device and the oxygen supply device are normally closed.

The invention discloses a novel process for eliminating trace phosphorus and boron by sufficiently contacting trichlorosilane with a humidified inert gas through partial hydrolysis, comprising the following steps of: carrying out the partial hydrolysis in a reaction tower by contacting the trichlorosilane with a certain proportion of water vapors so as to achieve the purpose of eliminating trace phosphorus-boron impurities contained in the trichlorosilane; and previously configuring the water vapors with the inert gas according to a certain proportion, and uniformly mixing, wherein temperature inside the reaction tower is 60-70 DEG C, pressure is 0.1-0.6 MPa, and the inlet pressure of the inert gas is 0.3-1 MPa. The novel process can be directly implemented on a trichlorosilane rectifyingtower and has the advantages of easy operation, low cost, continuous production and good phosphorus-boron eliminating effect.

The invention discloses a base station antenna with convenience in snow removal. The base station antenna comprises a holding rod, an antenna, a clamp and a snow remover; the antenna is mounted on the holding rod through the clamp; the snow remover is mounted on the top of the holding rod; the snow remover comprises a shell, a fan, a snow removing air channel, a heater, a hot air channel, a compression air channel, a bending pipe and a nozzle; the snow removing air channel, the heater, the hot air channel and the compression air channel are arranged in the shell; the fan, the snow removing air channel, the heater, the hot air channel and the compression air channel are connected in sequence; the fan is arranged on the shell and runs through the shell to be connected with the outside; the compression air channel is formed in the shell and runs through the shell to be connected with the nozzle through the bending pipe; and the dimension of one end, connected to the bending pipe, of the compression air channel is smaller than the dimension of one end, connected to the hot air channel of the compression air channel. According to the base station antenna with convenience in snow removal, by virtue of the setting of the snow remover, the snow accumulation load of the antenna is lowered, so that the base station antenna cannot suffer from accidents in heavy snow, and the use safety of the base station antenna is improved.

The invention relates to a helium(hydrogen) unmanned aerial vehicle. The helium(hydrogen) unmanned aerial vehicle comprises a vehicle bracket, wherein propellers are arranged on the bracket, and an air pressure measuring and controlling element, a PCB and a battery are arranged in the center of the vehicle bracket; the outer end of the vehicle bracket is connected with an annular balloon through nylon net buckles; a micro solenoid valve on a micro compressed air pocket in the center of the vehicle bracket is connected with the annular balloon through an inflating pipe; a micro snuffle valve is mounted at a snuffle opening of the annular balloon; the micro solenoid valve and a circuit of the micro snuffle valve are electrically connected with the air pressure measuring and controlling unit; and the annular balloon is filled with helium or hydrogen. Through adjustment of pressure in the annular balloon, the rising and the landing of the unmanned aerial vehicle can be automatically adjusted, so that power consumption of the propellers is reduced, the flight time is prolonged in multiples, the safety is high, and the unmanned aerial vehicle can land stably.

The invention discloses a power plug assembly, which comprises a socket fixedly installed in the wall and a plug connected with a household appliance. A first slot and a second slot are arranged symmetrically up and down in the socket. The bottom of the first slot in the receptacle is provided with a first installation groove that communicates with the first slot, and the top of the receptacle is located at the top of the second slot. The second installation groove of the groove, the first sliding groove is provided between the first installation groove and the second installation groove in the socket, the first sliding groove communicates with the first slot, the The inner wall on the right side of the first sliding groove is provided with a power supply pin connected to the mains. The first sliding groove is slidably mounted with a sliding arm. As for the matching power supply slot, the inner wall on the right side of the first installation slot is provided with a second sliding slot communicating with the first sliding slot.

The invention discloses a new type of power plug assembly, which includes a socket fixedly installed in the wall and a plug connected with a household appliance, and a first slot and a second slot are arranged symmetrically up and down in the socket, The bottom of the first slot in the socket is provided with a first installation groove that communicates with the first slot, and the top of the socket in the socket is provided with a slot that communicates with the second slot. The second installation groove of the socket, the first sliding groove is provided between the first installation groove and the second installation groove in the socket, and the first sliding groove communicates with the first slot, so The inner wall on the right side of the first sliding groove is provided with a power supply pin connected to the mains. The first sliding groove is slidably installed with a sliding arm. For the matching power supply slot, the inner wall on the right side of the first installation slot is provided with a second sliding slot communicating with the first sliding slot.

The invention relates to smelting technology, in particular to a full vanadium-titanium mineral blast-furnace smelting method, which particularly comprises the following five steps: firstly, analysis of bulk samples; secondly, grouping according to different analysis results; thirdly, proportioning, namely various groups of concentrates are proportioned respectively, the weight percentage of the compositions is as follows: 1 to 8 percent of SiO2 and 99 to 92 percent of high-titanium vanadium-titanium magnetite concentrates, and sintered minerals are obtained by sintered compositions and binary basicity; fourthly, furnace entry, namely the sintered minerals enter a furnace, the furnace temperature is controlled to be between 1,390 and 1,440 DEG C, and the furnace entry time is between 60 and 150 minutes; and fifthly, blast furnace tapping, wherein the proportion of titania in furnace residue is less than 23 percent. The invention can overcome the defect of pollution of pig iron and vanadium products and can effectively reduce the cost of vanadium purification because beneficial elements such as vanadium in molten iron cannot be diluted.

The invention discloses an automobile hydraulic braking device, which comprises an oil pump, a filter, a pressure gauge, a control valve, a braking oil cylinder, an adjustable flow valve, an overflow valve and an oil return pipe, wherein an oil inlet and an oil return port are formed in one side of the valve body of the control valve, and an oil outlet is formed in the other side of the valve body of the control valve; a spring is arranged between the tail end of the valve core and the valve body; the valve core is provided with a valve hole; when the valve core moves, the oil outlet is communicated with the oil inlet or the oil return port through a valve hole; a cylinder body oil inlet of a braking oil cylinder is provided with an oil pipe joint; a belleville spring is arranged between the tail end of a piston and the cylinder body; a brake block is fixed to the cylinder body through a stop screw; the tail end of a piston rod is then connected with the brake block through a connecting screw; the oil pump is connected with the filter; the filter is communicated with the oil inlets of the overflow valve and the control valve through an oil path provided with the pressure gauge respectively; the oil outlet of the control valve is communicated with an oil pipe joint of the braking oil cylinder; the oil return port is communicated with the adjustable flow valve; and the overflow valve is connected with the oil return pipe. The automobile hydraulic braking device has extremely high safety and reliability, and the driving risk can be effectively reduced.

The invention relates to an integrated high temperature gas cooling pebble bed nuclear reactor power generation system comprising a nuclear reactor core and a nuclear reactor middle shell sleeving the nuclear reactor core. The nuclear reactor middle shell is communicated with a first heat exchange circulating loop, a nuclear reactor outer shell sleeves the first heat exchange circulating loop, a steam outlet of the top of the nuclear reactor outer shell is connected to a steam power generator, a steam valve is arranged in the steam inlet of the steam power generator, the bottom of the steam power generator is connected to a condenser through a pipeline, the bottom of the condenser is connected to a pump through the pipeline, and the pump is connected to the liquid inlet of the bottom of the nuclear reactor outer shell through a pipeline to form a second heat exchange circulating loop. The problems that an existing pressurized water type and high temperature gas cooling pebble nuclear fuel nuclear reactors are low in efficiency and safety and are not environment-friendly, and nuclear accident and nuclear leakage risks exist can be overcome, and the system is safer, more environment-friendly and more efficient.

The invention discloses an ecological wetland device which is characterized by comprising a protection system (1), a purification system (2) and a control system (3), wherein the purification system (2) and the control system (3) are arranged in the protection system (1); the protection system (1) comprises an outer basin (11); an inner basin (12) is arranged in the outer basin (11); a plurality of holes (18) are formed at the bottom of the inner basin (12); a support shaft (13) is vertically arranged in the center of the inner basin (12); and a support platform (14) for accommodating the control system (3) is arranged in the middle of the support shaft (13). The ecological wetland device disclosed by the invention is simple in structure and convenient to assemble and detach, and can conveniently move to other polluted areas for purification in the next stage; and the effect of purifying water movably can be achieved with low manual moving expense.

The invention discloses an intelligent access tool cabinet for a rail transit engineering vehicle. An electronic lock and an acousto-optic alarm module are arranged on a unit cabinet, a tool samplingsensor is arranged in a tool placement forming die of the unit cabinet, a programmable controller obtains the specific position of placing a tool and the information about whether the tool is placed in the unit cabinet by collecting the signal of the tool sampling sensor, a display module outputs an operation control signal to the programmable controller, the programmable controller controls a relay module so as to make an electronic lock connected with the relay module act after receiving an opening control signal of the corresponding unit cabinet of the corresponding tool, and thereby the unit cabinet is opened, and the acousto-optic alarm module corresponding to the unit cabinet sends an acousto-optic warning signal so as to guide an operator to quickly take out the tool. The intelligent access tool cabinet can solve the technical problem that the existing railway intelligent tool cabinet is complex in system, too high in cost and easily interfered, and the tool cannot be returned successfully in time due to the fact that a metal label of the work tool is extremely easy to damage and lose.

The invention provides an overhead three-dimensional multi-layer multifunctional road which is characterized in that the road is built on land with the same area, only one two-way six-lane road can be built in the prior art, but according to the technology, one multi-way aerial layer can be built, which is double as the two-way six-lane road built in the traditional technology, and three multi-way aerial layers can be built, which is four times more than the two-way six-lane road built in the traditional technology. The technology is of a new technology of using aerial space in a city and fully utilizing the space. An automobile industry can be developed in an unlimited manner through the technology, possession and use of automobiles by people can be excited in an unlimited and vigorous manner, and no other ways exist. Therefore, by transforming old lanes and newly building the road through the technology, (1) the traffic jam problem can be solved for ever; and (2) tail gas which is exhausted from the automobiles due to burning of petroleum can be recovered, and carbon emission can be reduced. In addition, the overhead three-dimensional multi-layer multifunctional road disclosed by the invention further has the advantages of simple structure and easiness in manufacturing.

The invention discloses a moveable cable cavern stopper, comprising a cable fireproof insulation sleeve (3), the periphery of the cable fireproof insulation sleeve is provided with a neck (12), the cable fireproof insulation sleeve (3) is connected with a fireproof insulation plate (2) opened with circular holes by the neck (12), and the two ends of the fireproof insulation plate (2) are respectively connected with a slideway (1). The invention is safe and reliable, is rapid to assembly, is firm and durable, does not deform or drop and has favourable fireproof and moistureproof functions.

The invention discloses a multiple parking garage which includes a first laminating layer and at least one layer of a second laminating layer. The first laminating layer is located on the uppermost layer of a garage body, and the second laminating layer is located below the first laminating layer; a ramp between the first laminating layer and the second laminating layer is used for driving through; the entire parking garage body is enclosed by external walls, each adjacent upper and lower laminating layer are divided by laminated plates, the bottommost of the parking garage body is a bottom plate, the topmost of the parking garage body is a top plate, and the top plate, the laminated plates and the bottom plate are supported by vertical columns in turn; parking spaces and driving-through lanes are arranged on the laminated plates and the bottom plate correspondingly; and at least one void is formed in each laminated plate, vertical wind and smoke pipes are installed in the void, wind openings and smoke openings are formed in the positions, located at the lower edges of the laminated plates, of the vertical wind and smoke pipes correspondingly, and the ends, located on the first laminating layer, of the vertical wind and smoke pipes communicates with horizontal wind and smoke pipes. The floor height of the parking space is reduced, void space is additionally arranged, pipeline layout is facilitated, and vertical space is reduced or not occupied; and ventilation and smoke exhaust are realized through the void, the cost can be greatly saved.

The invention discloses a safe firework drug, which is composed of A, B and C chemical material, wherein the component A is 55-65% potassium perchlorate, 25-30% potassium hydrogen-phthalate, 0.5-5% potassium permanganate, 8-10% cement, which displays red; the component B contains 60-70% potassium perchlorate, 3-5% copper oxide, 3-5% barium nitrate, 6-10% polychloroethylene, 15-25% sulfur and 3 -6% cement, which displays blue; the component C concludes 65-75% potassium perchlorate, 4-10% ferric powder, 3-4% basic copper carbonate, 5-15% phenol resin, 6-10% polychloroethylene, 3-5% barium nitrate and 4-6% cement, which displays green.

The invention discloses a main power supply and emergency power supply switching device having delay protection. The main power supply and emergency power supply switching device having delay protection comprises a contactor, an overload protection mechanism and a delay protection mechanism, wherein a contactor coil is connected with a main power supply, contactor armatures attract to each other when the main power supply is energized, a movable contact is driven to be connected with a contact of the main power supply, and power is supplied by the main power supply; when the main power supplyis disconnected, the contactor coil is deenergized, the contactor armatures are disconnected under an effect of a spring force, the movable contact is driven to be connected with an emergency power supply, and power is supplied by the emergency power supply; when the main power supply is recovered again, relatively large voltage fluctuation probably occurs due to unstable voltage at an initial stage of power supply recovery, equipment, particularly precious precise equipment can be damaged, at the moment, a delay protection mechanism acts, the power supply is connected in a delay way, and theprotection equipment is not damaged; and during short circuit, overcurrent and overload, the main power supply or the emergency power supply is disconnected by an overload protection mechanism, so that the equipment is protected, and no accident is ensured.

The invention provides a novel dual-purpose tire which can be used for a long time under an inflation or non-inflation condition and a molding process of the novel dual-purpose tire. The tire sequentially comprises a tread, a belted layer, a primary tire body, a secondary tire body, an inner supporting body, an inner pressure-bearing ring, a steel ring, a breathing hole and the like from outside to inside, wherein the parts are tightly combined into a whole through a curing cross-linking reaction by adopting polymer liquid mixtures with different formulas, so that different requirements of the parts of the tire on material performance are met, and rapid forming of the tire is ensured. The tire production efficiency is high, and the production cost can be effectively reduced. The tire is suitable for tires of heavy trucks, trailers, light trucks, off-road vehicles, ATVs, buses, airplanes, agriculture, mining, bicycles, motorcycles and passenger vehicles.

A safety valve for chlorine and ammonia relates to a special valve. Including valve body, valve seat, valve cover, valve stem, valve disc, the valve body includes inlet and outlet, the inlet of the valve body is set in the vertical downward direction, the outlet of the valve body is set in the horizontal direction, and the shape between the inlet and the outlet is Set at 90°, the inlet and outlet of the valve body are respectively provided with connecting flanges; a guide sleeve is installed at the assembly hole at the upper end of the valve body, and the guide sleeve is fixed between the valve body and the valve cover; the valve stem jacket in the valve cover To the spring, the spring seat, and the spring seat respectively cooperate and interfere with the two ends of the spring; the lower end surface of the valve disc and the upper sealing surface of the valve seat are closely matched in a detachable manner, and a special-shaped groove is set on the lower end surface of the valve disc, and the molding in the special-shaped groove is strengthened. Polytetrafluoroethylene resin, polytetrafluoroethylene resin is sintered in the special-shaped groove; hard alloy layer is surfacing on the sealing surface of the upper end of the valve seat. The valve has good anti-corrosion effect, erosion resistance, zero leakage, no frequency jumping and fluttering of the disc, safe and reliable, and no accidents.

The invention relates to a polishing device, in particular to a special novel insulator core rod polishing device. According to the adopted technical scheme, the special novel insulator core rod polishing device comprises a polishing bin, two vertically-arranged air cylinders are mounted on the inner wall of the top end of the polishing bin, and a horizontally-arranged moving plate is arranged atthe bottoms of the air cylinders and connected with piston rods of the air cylinders; a rotating motor is mounted at the top end of the moving plate, a vertically-placed rotating rod is arranged at the bottom end of the moving plate, and an output shaft of the rotating motor is connected with the rotating rod; a polishing block is mounted at the bottom end of the rotating rod, a working table is arranged on the lower portion of the polishing bin, and an insulator core rod conveying mechanism is arranged below the working table; and the polishing bin communicates with a dust removing tank, an air outlet is formed in the top of the dust removing tank, a dust collecting hopper is arranged at the bottom of the dust removing tank in a detachably connected mode, and a spraying pipe is arranged on the upper portion in the dust removing tank. The special novel insulator core rod polishing device has the advantages that the structure is reasonable, the work efficiency of workers can be improved, and the labor intensity of the workers is lowered.

The invention discloses a clamp for glass mold station transfer, and belongs to the technical field of auxiliary facilities for glass mold machining. The clamp for glass mold station transfer comprises a base, a threaded rod, a hand wheel mechanism, a rotating frame, a sliding platform and a glass mold clamping mechanism. A threaded rod fixing sleeve is fixedly arranged in the center of the upwardside of the base and is perpendicular to the base. The lower end of the threaded rod is inserted into the threaded rod fixing sleeve and fixedly arranged in the threaded rod fixing sleeve, and the upper end of the threaded rod upwards stretches. The hand wheel mechanism is arranged on the threaded rod in a threaded matching mode. A rotating frame sleeve is formed at one end of the rotating frame,sleeves the threaded rod in an up-and-down movement mode at the position corresponding to the top of a hand wheel, and is supported by the hand wheel mechanism. The other end of the rotating frame stretches in the direction of being far away from the threaded rod, and a sliding platform guide rail fixing arm is formed at the other end of the rotating frame. The sliding platform and the sliding platform guide rail fixing arm are in sliding fit. The glass mold clamping mechanism is arranged on the sliding platform in a rotating mode. The working intensity is reduced, the clamping efficiency isimproved, the manpower resource is saved, the safety is guaranteed, and energy conservation is embodied.

The invention discloses a multifunctional forge piece overturning auxiliary device. The device comprises an anti-skid base, wherein a rotating column is rotationally arranged in the upper end face of the anti-skid base; a fixed base plate is fixedly arranged on the upper end face of the rotating column; rotary connecting columns are fixedly arranged at the front side and the rear side of the upper end face of the fixed base plate correspondingly; rotary drum shafts are rotationally arranged in the rear end face of the rotary connecting column at the front side and the front end face of the rotary connecting column at the rear side correspondingly; a rotary drum is fixedly arranged between the rotary drum shafts at the front side and the rear side; a rotating rod cavity is arranged in the rotary drum in a left-right penetrating mode; and a rotating rod is arranged in the rotating rod cavity in a left-right sliding mode. According to the device, a forge worker can achieve moving, overturning and the like of a forge piece through simple operation, forge piece lifting is more labor-saving based on the lever principle, a motor is used for assisting in overturning the forge piece, meanwhile, the device is provided with an anti-skid structure, and accidents caused by sliding due to the weight of the forge piece in the operation process are avoided.

A linkage control system of a lifting mechanism and a walking mechanism of a dumper comprises a first manual reversing valve, a lifting oil cylinder, a gear selecting operating valve, a forward gear clutch, a reverse gear clutch, a hydraulic pump and an oil tank; an executing port A and an executing port B of the first manual reversing valve communicate with a rodless cavity and a rod cavity of the lifting oil cylinder correspondingly; an executing port A and an executing port B of the gear selecting operating valve communicate with the forward gear clutch and the reverse gear clutch correspondingly; a second manual reversing valve is further included; an oil inlet P of the second manual reversing valve communicates with the hydraulic pump; a first oil outlet A of the second manual reversing valve communicates with an oil inlet P of the gear selecting operating valve; and a second oil outlet B of the second manual reversing valve communicates with an oil inlet P of the first manual reversing valve. The linkage control system of the lifting mechanism and the walking mechanism of the dumper can achieve that a piston rod of the lifting oil cylinder cannot stretch out any more when self-discharging operation is performed and a driver cannot engage a forward gear or a reverse gear and starts driving, and after the driver engages the forward gear or the retreat gear and starts driving.

The invention relates to a hand-operated time-delay electromagnetic valve and piezoelectric ignition combined gas cooker, which is free from a power supply and can automatically prolong the ignition time by manually pressing and opening the gas gate of an electromagnetic valve; as no battery is used, the coil of the electromagnetic valve cannot be burnt out, and the failure rate is very low; an extinguishing protection function is achieved, that is, the gas gate can be closed automatically if fire is extinguished by wind or boiling and spilling water, so that no fuel gas escapes to cause safety accidents; a timing gas turn-off function is achieved, that is, the electromagnetic valve can automatically close the gas gate when the set gas turn-off time is up, so that a user doesn't need to be careful of remembering to turn off gas to prevent food from being burnt; the gas cooker is an environment-friendly gas cooker product which is simple in structure and low in cost, is generally suitable to being used as a cooker of liquefied gas, coal gas, natural gas, marsh gas or the like, and is a practical gas cooker product for families and the catering industry.

The invention discloses a gear milling device. The gear milling device comprises a machine body, and the middle of the machine body is provided with a cavity having a leftward opening; the right end wall of the cavity is provided with a sliding cavity communicating with the cavity, and the sliding cavity is internally provided with a main transmission shaft rotationally connected with the upper end wall and the lower end wall; the main transmission shaft is provided with a milling device; the upper end of the sliding cavity is provided with a third moving cavity; the upper end of the main transmission shaft stretches into the third moving cavity to be rotationally connected with the wall body between the third moving cavity and the sliding cavity; a rotary device is arranged in the third moving cavity; the upper side of the cavity is provided with a first moving cavity, and the top wall of the first moving cavity is fixedly provided with rotary motors in a bilaterally symmetrical mode;and the rotary motors are in power connection with screws, and the screws stretch into the first moving cavity and are rotationally connected with the bottom wall of the first moving cavity.

The invention discloses a clamp capable of turning eccentric workpieces. The clamp comprises a fixed flange (1); a screw hole (2) is formed in the fixed flange at one side close to the outer edge; and an arched slot (3) is formed in the fixed flange at the other side. When the clamp is used, a bolt passes through the screw hole in the fixed flange to fix the fixed flange on a lathe; the bolt passes through the arched slot of the fixed flange to be fixed after adjusting the position of the arched slot of the fixed flange according to to-be-manufactured workpieces; the position of the clamp can be adjusted by only adjusting the position of the bolt in the arched slot. By adopting the structure, the fixed flange is fixed on the lathe; the lathe is capable of simultaneously turning coaxial workpieces and eccentric workpieces by adjusting the position of the fixed flange; and in addition, the adjustment is convenient, and no accident is caused.