203results about How to "Strong security and reliability" patented technology

A full-screen mobile phone with a camera under a transparent screen comprises a case, wherein the case is provided with an opening in the front side; a front camera, a rear camera, a loudspeaker, a circuit board and a battery below the circuit board are arranged in the case; the front camera, the rear camera and the loudspeaker are arranged at the upper part in the case, a transparent display screen located at the front sides of the front camera, the rear camera, the loudspeaker, the circuit board and the battery is arranged on the inner side wall of the case, and the transparent display screen is adhered to the front side of the case. The invention also discloses an operation method of the full-screen mobile phone with the camera under the transparent screen. When the front camera is started to shoot, a screen display area in front of the front camera on the transparent display screen does not display contents and becomes transparent, and thus the front camera can capture the scene infront of the transparent display screen to shoot. The full-screen mobile phone disclosed by the invention is a true full-screen mobile phone, which means that no visible sensor exists on the front surface of the mobile phone and the screen ratio of the mobile phone can be maximized in combination with the prior art.

The invention discloses a drilling device applied to graphite mold production. The drilling device comprises a frame and a drilling table; drilling longitudinal frames and a drilling transverse frame are arranged on the frame; the drilling longitudinal frames are positioned at the two sides of the frame; the drilling transverse frame is positioned between the drilling longitudinal frames, and is provided with a lifting driving mechanism and a lifting mechanism; the lifting mechanism includes lifting platforms and lifting lead screws; the lifting lead screws are mounted in the drilling longitudinal frames, and are connected with lifting lead screw connecting bases; the lifting lead screw connecting bases are connected with the lifting platforms; drilling mechanisms are arranged on the lifting platforms, and include drilling motors and drilling lead screws; the drilling motors are connected with drilling motor output shafts; the drilling motor output shafts are connected with drilling speed reducers; the drilling speed reducers are connected with the drilling lead screws; the drilling lead screws are connected with drilling bases; and the drilling bases are connected with drill rods. The machine is simple in structure, strong in pertinency, precise in positioning and excellent in drilling effect, and preferably solves the drilling problem in the graphite mold production.

The invention discloses a mountain torrent disaster on-line monitoring and identification early warning method. The method includes the following steps that: a data acquisition subsystem acquires data at a site: an automatic rainfall monitoring station acquires and processes disaster field rainfall information and transmits the information to the system platform of an early warning index analysis model through a wireless mode and / or a wired transmission mode, a water level and / or mud level monitoring station acquires and processes field debris flow and water level information and transmits the information to the system platform of the early warning index analysis model through a wireless mode and / or a wired transmission mode, and a video monitoring station acquires and processes disaster field image information and transmits the information to the system platform of the early warning index analysis model through a wireless mode and / or a wired transmission mode; an identification early warning subsystem performs early warning judgment and issues internal early warnings; personnel are determined, and formal early warnings are issued; real-time monitoring is performed; and information query is performed. The method has the advantages of rapid identification and predictive early warning, and can assist in avoiding loss. The invention also discloses an early warning system using the mountain torrent disaster on-line monitoring and identification early warning method.

The invention relates to a jet type torsional impact drilling tool. The jet type torsional impact drilling tool comprises an upper connector, an outer shell, a float valve, a valve seat spreader plate, a jet element, a jet spreader plate, a punch hammer, an impact transmission cylinder and a spring. The upper connector is fixedly connected with the outer shell, the outer shell is fixedly connected with the impact transmission cylinder, the float valve, the valve seat spreader plate, the jet element, the jet spreader plate and the spring are located in the outer shell, and the punch hammer is arranged in the transmission cylinder. According to the jet type torsional impact drilling tool, the attachment jet element generates alternating jet to drive the punch hammer to swing left and right, and the punch hammer collides with and impacts on the transmission cylinder to make underground torque greatly fluctuate; compared with a conventional drilling mode, the mean value of the torque of an underground drill bit is increased, the torque of the underground drilling tool is made to greatly fluctuate at high frequency in the drilling process, the stick slip phenomenon of the drill bit is alleviated, the probability of bit bouncing is reduced, and drilling efficiency is improved. The drilling tool is fewer in movable parts and quick-wear parts, long in normal work life, and high in safe reliability.

The invention provides a positioning fixture tool which is used for drilling and milling gold of an end cover of an electric generator and comprises a clamping device and a positioning device statically connected with the clamping device, wherein the clamping device is used for fixing the end cover and comprises a pull rod (1), a press block (2), a panel (4), an air cylinder (5), a long side plate (6), a short side plate (7) and a positioning table positioning pin (8); the positioning device comprises a positioning table (a1) and a positioning pin (a2); the panel (4), the long side plate (6) and the short side plate (7) from a support mechanism of the clamping device; and the pull rod (1) penetrates through the press block (2), the positioning table (a1) and the panel (4) and is connected with the air cylinder (5). By the aid of the tool, when the end cover of the electric generator is placed on a drilling and milling processing center, the positioning is accurate, the placing is convenient, the tool universality is high, the preparation time for product switching is short, the stability, the reliability and the safety are high with the adoption of air compression operation, and the production efficiency and the product quality are improved.

The invention discloses a method for automatically registering a wireless terminal by utilizing physical characteristics, which is characterized in that the wireless terminal is automatically registered by utilizing the physical characteristics containing received signal strength indication (RSSI), signal quality carrier to interference plus noise ratio / signal to interference plus noise ratio (CINR / SINR), timing offset, frequency offset, a user terminal position, a terminal signal incident angle and a wireless fidelity media access control (MAC) address to serve as authentication conditions. According to the method for automatically registering the wireless terminal by utilizing the physical characteristics, a wireless user is registered by a simple step, thereby, the use complexity is reduced, and the information safety of the user is ensured. The method for automatically registering the wireless terminal by utilizing the physical characteristics has good popularization value.

The invention discloses an electromagnetic shielding machine case which is composed of a machine case housing (1), side panels (9), waveguide windows, an aviation plug (8) and a power filter (12). Two side panels (9) are arranged on choke grooves (13) on two lateral sides of the machine case housing (1) respectively, the aviation plug (8) and the power filter (12) are arranged in the machine case housing (1), and a front side panel (6) and a rear side panel (11) are respectively provided with a waveguide window to achieve a purpose of efficient shielding. The electromagnetic shielding machine case is clear in structure and good in practicality, achieves the purposes of being convenient to move, high in shielding efficiency, safety and reliability, good in environment adaptation and wide in application range, solves the problems of computer damage caused by electronic pulse and electromagnetic information leaking and is suitable for military and confidential situations.

The invention relates to a motor system for lifting an ocean platform and a load unbalance monitoring and controlling method of the motor system. According to the motor system, an oil inlet pressure relay and an oil outlet pressure relay are respectively arranged at an oil inlet and an oil outlet of each motor and are used for monitoring the pressure of the oil inlet and the pressure of the oil outlet of each motor in real time and comparing the pressure of the oil inlet and the pressure of the oil outlet with a set pressure, if the pressure of the oil inlet and the pressure of the oil outlet are higher than the set pressure, the oil inlet pressure relay and the oil outlet pressure relay sent signals to a PLC (Programmable Logical Controller) control system and the PLC control system judges whether the motor is at a load unbalance state according to the time duration, and if the motor is at the load unbalance state, the PLC control system gives an alarm and is powered off, so that the load unbalance of the motor is monitored and controlled in real time, and therefore, the operation safety and reliability of the lifting system of the ocean platform are enhanced. The motor system disclosed by the invention is better in safety and reliability and strong in controllability.

The invention aims to provide a mine single-rope hoisting balance wheel brake rope anti-case-crashing device and relates to the technical field of mine safety devices. A hoisting container is connected with another hoisting balance container through more than two brake ropes and more than two corresponding balance wheels; each balance wheel is arranged on a balance wheel axle; the balance wheel axle is arranged on an elastic bearing device through a bearing; the wheel edge of the balance wheel is provided with a friction brake surface; a damper brake is arranged below the balance wheel; and an idle stroke distance exists in the upward direction and the downward direction of the damper brake and the friction brake surface of the balance wheel. The device not only keeps the advantage of the less investment cost of single-rope hoisting, but also has the safety property of multi-rope falling prevention protection, can completely solve the problems that a falling protector cannot be actuated when rope breaking case crashing or rope sliding case crashing happen in a traditional falling protector system, buffer brake force is uncertain, and the buffer brake force is difficult to be accurately calibrated in an use site, and has the advantages of strong safety and reliability and wide application range.

The invention belongs to the field of printing of books, relates to a paper book, and particularly relates to a paper book with functions of an electronic book, which comprises a front cover (1), a back cover (4), a spine (6), pages (3) and an electronic chip (2). The electronic chip (2) is planted into the front cover (1) or the back cover (4) or the spine (6), is a radio frequency identification RFID electronic chip and is integrally connected with a USB (universal serial bus) interface (5) by a data line (7), and the USB interface (5) is disposed on the spine (6) and fixed to the upper end or the lower end of the spine (6). Advantages of a traditional paper book and the electronic book are combined and organically integrated, and the paper book with functions of the electronic book has excellent application prospect in the field of printing and publishing of books.

The invention discloses a mining explosion-proof LED emergency light. An explosion-proof box body (11) and a light holder casing (6) are used as a radiating channel, radiating fins are arranged on the outside of an aluminum alloy casing, and radiation is achieved through natural convection of air. A circuit portion includes an underground alternating current (12), a voltage detection circuit (13), a rectifier filter circuit and chip enabling circuit (14), a battery charge and discharge circuit (15), a storage battery (16), an out switch (17), an LED constant current driving circuit (18) and an LED light set (19). LEDs are utilized as light sources and have the advantages of high light emitting efficiency, low power consumption, high safety and reliability, environment-friendliness and the like. The explosion-proof box body is compact in structure and good in radiating effect, so that the mining explosion-proof LED emergency light is high in safety and reliability. LED constant current driving is adopted, uneven brightness of the battery due to voltage variation is avoided, and the service life of the LED is prolonged.

The invention belongs to the technical field of medical blood gas biochemical detection equipment, and relates to an integrated kit and a matched device thereof. The matched device consists of an integrated kit, an interface seat assembly, an analyzer bracket, a guide rail and a liquid path system; the integrated kit is composed of an encryption chip assembly, a kit body, a waste liquid bag assembly, a kit cover, a cleaning liquid bag assembly and a reagent bag assembly; and a cleaning liquid bag, a waste liquid bag and various standard liquid reagent bags are all internally packaged and sealed in the independent integrated kit in a combined and double-layer sealing mode. A double-needle layout is adopted on the waste liquid exhaust assembly, one needle is responsible for recovering wasteliquid, and the other needle is responsible for exhausting or overflowing the waste liquid; and once the waste liquid bag is filled with waste liquid or the waste liquid overflows along with gas, thewaste liquid can be reliably and completely recycled through the liquid path system, the safety of an operator is guaranteed to the maximum extent, and the integrated kit and the matched device can beapplied to medical diagnosis and clinical treatment of pneumonia infected by similar novel coronaviruses and used in cooperation with a blood gas biochemical analyzer.

The invention relates to a water heater and an electric leakage and dry burning preventing detection method of the water heater. The water heater comprises an inner container, a heating pipe, a pipe joint and a control unit, wherein the heating pipe is installed in the inner container through a heating tube flange, the pipe joint comprises an insulating piece and two metal pieces which are embedded in the insulating piece and are mutually insulated, the metal pieces which are arranged in the pipe joint and connected with the inner container are provided with conductive components, and the conductive components are led out from the insulating piece and are electrically connected with a current or voltage detection circuit in the control unit. Therefore, detection for whether electric leakage of the water heater exists can be achieved by means of the conductive components on the metal pieces contacted with the inner container, an achieving mode is simple, as long as electric leakage exists, timely alarming can be achieved, and safety and reliability are strong. Meanwhile, by means of judging whether the conductive components and conductive components on the heating tube flange are in a conductive state, whether the water heater is in a dry burning state can be judged, electrodes are not needed to be arranged inside the inner container, and structural design is simple, installation and maintenance are convenient, and cost is saved.

The invention discloses a three-motor steering-by-wire system and a control method thereof. The system comprises a steering wheel module, a steering module and an ECU control module. The steering wheel module is used for a driver to operate and control a vehicle to turn, the steering module comprises a first clutch, a third motor, a planet gear mechanism, a second clutch, a first motor, a second motor, a steering gear and a steering rack, ECU in the ECU control module reads the vehicle running speed, a corner signal of a steering wheel, a torque signal of a rotating rod, current fed back by all motor controllers and other signals, the vehicle steering working conditions are analyzed and judged, and then running of all motors and on and off of the clutches are controlled; motor power is subjected to coupling and distribution through the planet gear mechanism and then cooperates with on and off of the clutches, switching of different steering modes of the steering system is achieved, andthen the requirements of the different steering working conditions and the safety of the system are met.

The invention relates to a magnetic damping tension precision adjustment device which is characterized in that a wrapping tape is arranged between belt-placing plates and fixed by a paper-pressing plate; the wrapping tape passes through a tension sensor after being pulled out; a damping plate is arranged under the belt-placing plate and fixed by a connecting piece; an autorotation body is provided with a rotating bearing and is provided with the damping plate, the belt-placing plate and the paper-pressing plate in sequence; an electromagnetic coil and the autorotation body are directly fixed on a revolution body which is installed on a main shaft; a controller is connected with a sliding ring on the main shaft by a lead; a carbon brush is arranged at the end part of the sliding ring which is arranged on the main shaft; and the main shaft and a director current motor are connected by a synchronous belt wheel. The invention has stable work, and convenient operation, strong safety and reliability, can directly and automatically adjust the tension and the tension angle without stop and can also improve the production efficiency.

The invention discloses a multifunctional integrated circuit debugging system with a circuit welding function. The system comprises a control host computer, a circuit board test fixture, a test signal output and observation unit and a rapid circuit board welder, wherein the test signal output end of the circuit board test fixture is connected with the signal input end of the test signal output and observation unit; a power line of the rapid circuit board welder is connected with the control host computer. The system is simple in structure, convenient to operate, diversified and concentrated in function, simple and easy in a using process, reliable in connection, accurate in test and high in welding efficiency, safe reliability and welding quality, functions of apparatuses such as an adjustable regulated power supply, an oscilloscope and an electronic load meter are integrated, and the circuit board debugging efficiency is greatly improved.

The invention discloses a drilling and blasting machine which comprises a connecting base, a drilling machine, a static blasting machine, a fixing frame, a rotating mechanism, a lifting mechanism and a positioning mechanism, wherein one end of the rotating mechanism is connected with the connecting base and the other end of the rotating mechanism is connected with the lifting mechanism; the lifting mechanism is connected with the drilling machine; the drilling machine and the static blasting machine are arranged at the two ends of the fixing frame oppositely; the positioning mechanism is arranged at the bottom of the rotating mechanism. The drilling and blasting machine provided by the invention integrates the drilling machine with the static blasting machine; the drilling machine can drill quickly, can drill at various angles, especially for hard objects, such as rocks, mountains and the like, can drill at different positions and angles; the drilling and blasting machine is provided with the static blasting machine in the same set of hydraulic system, the static blasting machine is implanted after the surface is drilled, and crushing operation is finished silently and statically.

The invention discloses a redundant electric assisting steering system of an automobile driving vehicle and a control method of the redundant electric assisting steering system. The electric assistingsteering system comprises a first torque coupler, a second torque coupler, a first assisting system, a second assisting system, a main controller and an alarming device. A steering wheel is connectedwith the first torque coupler through a first intermediate shaft, after being connected in parallel, the first assisting system and the second assisting system are connected with the second torque coupler through output shafts, the second torque coupler is connected with the first torque coupler through a second intermediate shaft, and the first torque coupler is connected with a steering devicethrough a third intermediate shaft. The control method includes the two portions of a control method in an active steering manner and a control method in an assisting steering manner. The redundant electric assisting steering system of the automobile driving vehicle and the control method of the redundant electric assisting steering system have the beneficial effects that sufficient time can be reserved for a driver to take over the steering wheel, the driver is prompted through the alarming device, and the safety of a steering system is effectively guaranteed.

The invention discloses an anti-fake combination set which cannot be faked easily and is high in anti-fake performance. The anti-fake combination set comprises an anti-fake pen and an anti-fake label. The anti-fake pen is provided with a power switch, an ultraviolet transmitting port, a voice device and a data line interface. A control circuit, a storage battery and an ultraviolet photoelectric sensor are arranged in the anti-fake pen. The ultraviolet photoelectric sensor is installed in the ultraviolet transmitting port, and the power switch, the storage battery, the ultraviolet photoelectric sensor, the voice device and the data line interface are all connected with the control circuit. The anti-fake label comprises a bottom layer, an anti-fake layer and a protective layer. The anti-fake layer is arranged between the bottom layer and the protective layer. Lattice codes and encrypted images are contained in the anti-fake layer and are made with ultraviolet invisible ink. The anti-fake combination set has the advantages that a software system inside the anti-fake pen is updated initiatively, and the anti-fake combination set has two voice playing modes, can adjust the volume and perform dual anti-fake identification, has high anti-fake capacity, is wide in application range, safe and high in reliability and saves energy.

The invention relates to the field of coal chemical industry, in particular to a safety shutdown interlocking of a Texaco gasification furnace. The safety shutdown interlocking monitors and controls the operation process of the gasification furnace through inlet pressure of a coal paste pump, and adopts two-in-three logic control over the inlet pressure of the coal paste pump. The invention solves the accidents of peroxide of the gasification furnace and peroxide explosion caused by big coal paste viscosity, poor flowability and blockage of the inlet of the coal paste pump. The interlocking has high accuracy and flowability, and is safe and reliable.

The invention relates to a multifunctional integrated circuit debugging instrument provided with a circuit board quick welding apparatus. The multifunctional integrated circuit debugging instrument comprises a control host, a circuit board test fixture, a test signal outputting and observing unit and a circuit board quick welding apparatus. The test signal output terminal of the circuit board test fixture is connected with the signal input terminal of the test signal outputting and observing unit, and the power line of the circuit board quick welding apparatus is connected with the control host. The multifunctional integrated circuit debugging instrument is simple in structure and easy and simple to operate, functions of an adjustable stabilized-voltage supply, an oscilloscope and an electronic load meter are integrated, the multifunctional integrated circuit debugging instrument has various functions which are concentrated, and is simple and easy to operate during the usage process, and is reliable in connection and accurate in test, the circuit board debugging efficiency is greatly improved, and the multifunctional integrated circuit debugging instrument is high in welding efficiency, safe reliability and welding quality, and vulnerable parts such as a ceramic heating core can be replaced conveniently.

A prompt drop escaping system of a super high-rise building comprises fixing connecting frames and fixing piles. The fixing connecting frames are arranged on the top of the high-rise building and around a selected floor, the fixing piles are fixed to the ground, inclined escaping ropes are connected between the fixing connecting frames and the fixing piles, the escaping ropes are provided with escaping devices capable of being rapidly installed on the escaping ropes and sliding from top to bottom, the lower portions of the escaping ropes are marked with brake reaction sections used for controlling braking of the escaping devices, and air cushions are arranged below the brake reaction sections of the escaping ropes and on the ground close to the fixing piles. The prompt drop escaping system of the super high-rise building is a self-rescuing device through which escapers can fast escape according to the preset escaping point when dangerous cases happen in the super high-rise building. The prompt drop escaping system has the advantages of being higher in escaping efficiency, high in safety performance and reliability, more portable, easier to use and maintain and lower in cost.

The invention relates to a method for depression-angle negative-pressure exploration and discharge of accumulated water in a goaf area of a mine. The method can solve the technical problems of poor safe controllability and the presence of safety risk of conventional exploration and discharge of the accumulated water in the goaf area. The method includes the following steps that S100, the working condition is surveyed and measured; S200, the accumulated water amount in the goaf area is estimated; S300, a plan for exploration and discharge of the water is made; S400, drainage boreholes are constructed; and S500, a pumping scheme is selected to pump the water. According to the method for depression-angle negative-pressure exploration and discharge of the accumulated water in the goaf area ofthe mine, depression-angle drilling is conducted in advance in the roadway, the accumulated water in the surrounding goaf area below the roadway is explored and discharged in advance, the roadway is located on the upper part of a water body in the goaf area, thus the water exploration and discharge process is absolutely safe, the water discharge work can be conducted in advance, the impact on roadway driving is reduced, the water discharge process does not rely entirely on water pressure differential artesian flow, but the water is pumped in the negative-pressure state through an air pressingdevice, and thus the safe reliability and controllability of the water exploration and discharge process is higher.

The invention discloses a rotary refrigerator rack and a refrigerator and belongs to the technical field of refrigerators. In order to solve the problems that operation is complicated and single-hand operation is not easy to realize during taking food deep inside due to food storage way of an existing refrigerator glass rack, the rotary refrigerator rack comprises a rack base and a rotary tray, the rack base is detachably connected in the refrigerator and the rotary tray is rotationally arranged on the rack base, can rotate in the horizontal direction and is used for storing food. The invention further discloses the refrigerator with the rotary refrigerator rack. The rotary tray used for storing food is rotationally arranged on the rack base and can rotate in the horizontal direction, so that the food stored deep inside the rack can be taken out by single hand, the rotary refrigerator rack is simple in structure and the problem that an existing glass rack is inconvenient to take the stored food and not easy to operate by single hand is solved effectively.

The invention discloses an unmanned aerial vehicle accident anti-falling damage device. The device comprises a buffer damping system installed at the lower portion of an unmanned aerial vehicle, and an air floatation deceleration balance regulating system installed on the top of the unmanned aerial vehicle. The device is novel in design, reasonable in structure and low in cost, the device can be installed on an existing unmanned aerial vehicle, safety guarantee is provided for the unmanned aerial vehicle, the phenomenon that the unmanned aerial vehicle is damaged due to the fact that the unmanned aerial vehicle falls freely after an accident crash is avoided, the safety reliability is high, economic losses of a user of the unmanned aerial vehicle are lowered to the greatest extent, and thesafety of persons and objects on the ground is protected against the fallen unmanned aerial vehicle.

A GIS basin-type insulator distributed capacitor-based bus voltage measurement device disclosed by the present invention is characterized by taking a GIS basin-type insulator scattering capacitor as ahigh-voltage arm and a voltage divider connected with a GIS basin-type insulator as a low-voltage arm, and utilizing the capacitor voltage division principle to measure the voltage between a guide rod in a GIS and a GIS shell, thereby real-timely monitoring the operation voltage of the GIS. In addition, a voltage divider shell and the GIS shell are in equipotential connection, thereby being ableto effectively shield an interference electric field generated by the other electrified equipment of a transformer substation, and guaranteeing the measurement accuracy.

The invention discloses a method for reducing loss caused by accidental fall of an unmanned aerial vehicle. The method includes the steps that 1, a buffering and shock absorbing system is installed onthe lower surface of a lower horizontal plate of the unmanned aerial vehicle; 2, an air floatation deceleration balance adjusting system is installed on the upper surface of an upper horizontal plateof the unmanned aerial vehicle; 3, a remote controller is operated on ground, and the unmanned aerial vehicle takes off to perform normal flight operation at high altitude; 4, when control losing ofthe unmanned aerial vehicle is generated because of wrong operation of an operator or a failure, and the unmanned aerial vehicle falls off directly from the high altitude, the buffering and shock absorbing system and the air floatation deceleration balance adjusting system are started. In the method, design is novel, the structure is reasonable, and cost is low; additional installation on the existing unmanned aerial vehicle is allowed to provide a safety guarantee for the unmanned aerial vehicle, safe reliability is high, the economic loss of a user of the unmanned aerial vehicle is reduced to the maximum degree, and the safety of persons and objects, smashed by falling, on the ground is also protected.

A steel wire rope middle fixator comprises a left side plate and a right side plate which are arranged up and down and are parallel. The front side edge of the left side plate and the front side edgeof the right side plate are connected into a whole through a vertical batten, and lifting lug pin shafts arranged on the upper portion of the left side plate and the upper portion of the right side plate. A first locating pin and a second locating pin are mounted at the positions, on the rear side of the vertical batten, of the lower portion of the left side plate and the lower portion of the right side plate. A wedge block with the upper portion wider than the lower portion is arranged between the first locating pin and the second locating pin and the vertical batten, the position, on the front side of the wedge block, of a steel wire rope and the rear side of the vertical batten are in pressed joint, and the position, on the rear side of the wedge block, of the steel wire rope are in pressed joint with the first locating pin and the second locating pin. The invention further discloses a use method of the steel wire rope middle fixator. The steel wire rope middle fixator is simple instructure and convenient to operate, steel wire rope fixing does not consume great effort, the steel wire rope is fixed based on the theory that a wedge is pressed to be tighter and tighter, and the safety reliability is high; and the use function of the steel wire rope is expanded, and the steel wire rope middle fixator can be used for traction operation of the fields of building machines, military and off-road driving, and has immeasurable functions.

The invention provides a coal mine drilling blowout preventer comprising an orifice casing. A blowout preventing shutter is fixedly connected to the top of the orifice casing through flanges, and each of two ends of the blowout preventing shutter is connected with a wheel disc through a lead screw. The coal mine drilling blowout preventer is reasonable in structure, small in size, high in strength and high in safe reliability. By the adoption of two blowout preventing facilities, sealing property and blowout preventing effect are good, and sudden blowout of water or gas coal dusts can be prevented. The coal mine drilling blowout preventer using the flanges for connection is simple to operate and convenient to demount and maintain, and the upper and lower two blowout preventing facilities can be detached and used individually.