55results about How to "Reliable working environment" patented technology

The invention relates to a preparation method of carbon foam heat insulation material added with hollow ceramic balls. The method includes the following steps: (1) uniform mixing of raw materials: thefoaming formula of phenolic foam comprises the steps: adding 3-5 parts of surfactant, 1-3 parts of foaming agent and 0-2wt% of hollow ceramic microballs to 100 parts of phenolic resin sequentially and uniformly dispersing the mixture by means of combining mechanical stirring and ultrasonic oscillation; (2) adding 5-9 parts of curing agent to the uniformly dispersed mixture of step (1) and after stirring, casting the mixture to a mold to be foamed and solidified, thus obtaining phenolic foam; and (3) carbonized heat treatment: after shelling treatment, putting the phenolic foam in a vacuum carbonization furnace to be heated to the temperature of 800 DEG C at the average rate of 0.5 DEG C / min under vacuum condition, thus obtaining the carbon foam heat insulation material. The high temperature heat insulation material has the advantages of light weight, high strength, low thermal conductivity, low coefficient of heat expansion, low cost, designability and the like.

The invention provides a self-catapulting launching device for a guided missile. The self-catapulting launching device comprises a flow-guiding cone, a limiting mechanism, a buffering device, a long guide rail, a short guide rail and adaptors; the flow-guiding cone is fixedly connected to the bottom end of a launching cylinder, the buffering device is fixedly connected to the outlet of the launching cylinder, the long guide rail and the short guide rail are fixed to the inner wall of the launching cylinder in the axis direction of the launching cylinder and are staggered and evenly distributed in the launching cylinder, grooves of the adaptors are slidingly matched with the long guide rail, gaps between two adjacent adaptors are slidingly matched with the short guide rail, the limiting mechanism is fixedly connected to the inner wall of the launching cylinder, the adaptors are limited to move to the interior of the cylinder in the axis direction of the launching cylinder, and after guided missile is filled, a closed space is defined by the bottoms of the adaptors, the bottom of the guided missile, the end face of the bottom of the long guide rail and the end face of the bottom of the short guide rail in the launching cylinder. The initial launching precision of the guided missile can be improved, and the manufacturing cost and the maintenance cost of the launching device are effectively lowered.

The invention discloses a secondary curing kiln of building material products. The secondary curing kiln comprises a kiln body, a ventilation mechanism, a heat exchange device, a humidity measurement device, a temperature measurement device, a transporter, ground rails and a control device. Air in an air duct, driven by a fan, is heated or cooled by the heat exchange device and then delivered into the curing kiln. According to temperature and humidity information in the kiln body, the control device controls temperature and humidity in the kiln body through controlling the rotating speed of the fan, the opening angle of an air valve and the running of the heat exchange device. The control device drives wheels to rotate through a driving device and controls the transporter to transport materials to a target position. The secondary curing kiln can realize automation control over temperature and humidity in the kiln, is easy to realize, convenient to operate, high in automation degree, high in temperature and humidity control precision, and safe and reliable in work environment, provides a stable curing space for plate materials, can realize material automatic transporting, and can improve the production rate and quality of the products.

The invention provides a V2I-based intelligent networked auxiliary perception streetlamp system for autonomous vehicles. The system comprises a streetlamp set in a road network and a data center, wherein the streetlamp is internally provided with a camera image sensor, a millimeter wave radar sensor and a laser radar sensor; the sensors are all connected with the data center to transmit the respectively acquired data to the data center; the data center carries out data extraction and fusion on the basis of a computer vision technology and a data fusion technology after receiving the data, so as to form real-time data of the road network; and the data center is combined with a 5G network service provider to distribute the real-time data of the corresponding road network to each vehicle-mounted terminal through a 5G network according to the demands of the autonomous vehicles, so as to realize the intelligent networked communication of V2I. The system is capable of detecting various pieces of information in the covered traffic range through the road network, so that the vehicle-mounted terminals can conveniently obtain the instant data information on the paths, thereby infinitely enlarging the perception range and avoiding potential safety hazards and traffic jam.

The invention discloses a fast cooling furnace body of a horizontal diffusion furnace. The fast cooling furnace body comprises a reaction quartz tube and a resistance furnace body arranged outside the reaction quartz tube in a sleeving manner. A columnar clearance with an annular cross section is arranged between the outer wall of the reaction quartz tube and the inner wall of the resistance furnace body. Sealing pieces are arranged at the two ends of the columnar clearance so that a closed ventilation channel can be formed by the columnar clearance. The resistance furnace body is provided with an air inlet for supplying air to the ventilation channel and air outlets for exhausting hot air in the ventilation channel. The fast cooling furnace body has the beneficial effects that the fast cooling function is achieved, and the influence of temperature fluctuation on a semiconductor part is reduced.

The invention relates to a unit-type dual-band infrared detection assembly suitable for a low-temperature environment. The unit-type dual-band infrared detection assembly mainly serves as a photovoltaic conversion sensor at the front end of a signal chain, and is especially suitable for the analysis and application field of broadband infrared spectrum under the low-temperature environment, wherein the low-temperature environment is an environment, where the temperature is lower than 80 K, preferably, 60 K-80 K; and the broadband, in the example, is 2.5-13.3 [mu]m infrared wavelength. A Dewar cavity is utilized to enable a color separation film to be packaged with two types of unit-type detectors, thereby effectively solving the problem of broadband coverage hard to be realized by single type of detector Dewar package; the detection assembly can combine a refrigerating machine to realize work under the low-temperature environment; and a pre-amplification circuit is integrated in the assembly in the form of a chip module, so that system noise can be further suppressed, and a voltage signal can be output directly.

The invention discloses steel pile anticorrosion operation equipment, which comprises an operation well, a drainage device, a vertical walking mechanism, a circumferential scanning mechanism, a surface treatment device, a spraying device and a propelling bin, wherein the operation well can float on the water level, the center of the operation well is provided with a cavity, the operation well consists of at least two valves capable of being switched, the switched operation well can encircle a steel pile, and the top and the bottom of the cavity are provided with sealing devices which can form seal together with the surface of the steel pile; the vertical walking mechanism is positioned in the cavity of the operation well and can move up and down; the circumferential scanning mechanism is arranged on the vertical walking mechanism and can move in the cavity of the operation well along the circumference; the surface treatment device is connected with the circumferential scanning mechanism and can clean the surface of the steel pile; the spraying device is connected with the circumferential scanning mechanism; and two independent driving devices are arranged in the propelling bin and connected with two propellers respectively. The equipment can finish a full secondary anticorrosion process of the steel pile, and provides a reliable operation environment and an effective operation means for anticorrosion maintenance of the marine steel pile.

The invention belongs to the technical field of vehicle-borne radars, and particularly relates to a vehicle-borne cotype radar embedded liquid cooling source. The liquid cooling source is embedded in an antenna framework of a vehicle-borne radar and provides circulating cooling liquid for a transmitter, arranged on the antenna framework, of the vehicle-borne radar through a circulating pipeline, and the liquid cooling source and the antenna framework form an integrated structure. The liquid cooling source is installed in the antenna array face of the vehicle-borne radar in an embedded mode, the liquid cooling source and vehicle-borne radar devices such as the antenna framework form a cotype whole, the liquid cooling source provides continuously circulating cooling liquid for the radar transmitter, accordingly, the technical problem of liquid feeding of a rotary pipeline of an antenna is solved, and reliable work environment is provided for the radar during operation; a unique ventilation and heat dissipation device is arranged on a lower airtight equipment cabinet, so that it is guaranteed that internal overtemperature cannot occur during continuous operation; because of a system liquid supplementation device, the number of random parts is reduced and maintenance security efficiency is improved; a system liquid drainage device facilitates replacement of the circulating cooling liquid.

The invention discloses a downhole petroleum formation fracturing string tension detecting instrument which comprises a tension gauge spindle. A pressure-tolerant outer pipe is sleeved on the outer wall of the tension gauge spindle. A sensor, a circuit board, a lithium battery component and a power switch device which are connected are sequentially disposed from top to bottom between the tension gauge spindle and the pressure-tolerant outer pipe. A lower connector is sleeved at the lower end of the tension gauge spindle. The detecting instrument is used for detecting downhole petroleum formation fracturing string tension. The sensor converts strain generated under axial tension of the spindle into impedance variation of strain gauges. The pressure-tolerant outer pipe separates and seals high-pressure downhole liquids to provide a reliable working environments for a tension gauge. A measuring and recording circuit on the circuit board converts the impedance variation into tension and stores data in real time. A lithium battery powers the tension gauge. The power switch is used for cutting off the battery during off-working state to save power. The detecting instrument is unique in design, simple in overall structure, and convenient to maintain.

The invention provides a flight control shock absorption device and an unmanned aerial vehicle, and relates to the technical field of the unmanned aerial vehicle. The flight control shock absorption device is applied to a flight control box. The flight control shock absorption includes a shock absorption plate, a first pillar, a second pillar and a non- Newtonian fluid buffer layer. One end of thefirst pillar is connected with the shock absorption plate, and the other end of the first pillar is connected with the flight control box. One end of the second pillar is connected with flight control box, and the other end of the second pillar is connected with the non- Newtonian fluid buffer layer. The first pillar and the second pillar are correspondingly arranged on both sides of the flight control box. The flight control shock absorption device can play a good role in the shock absorption towards the flight control box, so that the damage to the flight control box during the tumbling process of the unmanned aerial vehicle is avoided, and the operation of the unmanned aerial vehicle is safer and more reliable. The fixing towards the flight control box is achieved, the shock absorptioneffect is achieved, and a stable and reliable working environment for an unmanned aerial vehicle flight control system is provided.

The invention discloses a method for producing a film sensor by using a turbine engine blade to be detected or the like as a substrate in the field of film sensors. The method comprises the following steps of: treating the surface of an alloy substrate, depositing a NiCrAlY alloy transition layer on the alloy substrate, separating out metallic aluminum, sputtering a metallic aluminum layer, performing oxidation treatment, setting an Al2O3 ceramic insulating layer, and setting a functional layer and an Al2O3 protective layer of the film sensor. A layer of metallic aluminum is directly sputtered after the aluminum of certain thickness is separated out of the NiCrAlY layer, and the separated aluminum and the sputtered aluminum are uniformly distributed on the surface of the NiCrAlY transition layer and then oxidized to generate an Al2O3 connecting transition layer; and the thickness of the NiCrAlY layer is only about 1 / 20 of the background technology. Therefore, the method has the characteristics that: the NiCrAlY transition layer is thin, the connecting strength of the NiCrAlY transition layer and the Al2O3 ceramic insulating layer is high, the preparation difficulty and the production cost are low, and the method is safe and reliable during working in the environment of about 1,000 DEG C and can provide accurate and reliable design proof for research and design of a turbine engine and the like.

The invention discloses magnetic resonance imaging equipment. The equipment comprises a static magnetic field magnet (1), a gradient magnetic field coil (2) and an RF coil (3); the RF coil (3) and a cylindrical air duct shell (41) which is arranged on the inner side of the RF coil (3) limit air ducts (43); a sound insulation layer (42) is also arranged between the RF coil (3) and the air duct shell (41); the sound insulation layer (42) is used for separating the of air ducts(43); the air ducts (43) are communicated with a fan (7); at least one circuit element (5) is mounted on the area, corresponding to the air ducts (43), on the inner side face of the RF coil (3); the fan (7) comprises a motor and a control device, the motor drives a blade to supply air to the air ducts (43), and the control device can control the rotation speed of the motor according to the temperature in the air ducts (43). The magnetic resonance imaging equipment monitors the temperature in the air ducts so that the temperature condition of the RF coil (3) can be obtained more truly, and therefore effective cooling operation is adopted.

The invention discloses a three-dimensional printing forming sealing device, which includes a working platform, a supporting mechanism with two opening ends and a sealing sleeve. One opening end of the supporting mechanism is arranged on the operating surface of the working platform, and the sealing sleeve is arranged on the other opening end of the supporting mechanism in a sealed mode; and the supporting mechanism is further provided with an air inlet and an air outlet, the sealing sleeve is provided with a connecting port, the connecting port is connected with a spindle of a three-dimensional printing laser head in a sealed mode, and the air inlet and the air outlet communicate with the gas environment inside and outside the sealing sleeve. By using the deformable sealing sleeve, the internal volume of the sealing device is changed during air intake and air exhaust, original gas in the sealing device can be fully replaced with protective gas in the sealing device, and the sealing device is internally kept dry by multiple cycles of air intake and exhaust, so that anti-steam performance and anti-oxidation gas explosion performance can be improved when the three-dimensional printing laser head conducts three-dimensional printing work.

The invention discloses an anti-dropping tackle for electric transmission lines. The anti-dropping tackle comprises a hook and a suspension mechanism, wherein a first pulley is installed in the hook.The hook is provided with an opening, a self-closing mechanism is arranged at the position, close to the opening, of the hook, and two sets of positioning columns are fixedly connected to the positions, close to the opening, of the hook. The self-sealing mechanism comprises an opening sealing plate and a lifting ring arranged at the upper end of the opening sealing plate, wherein the opening sealing plate is provided with two first long strip holes and a second long strip hole. The positioning columns are slidably matched with the first long strip holes, and the second long strip hole providessliding space for a central shaft of the first pulley. Two springs are fixed to the outer end face of the opening sealing plate, and the positioning columns are fixedly connected to the other ends ofthe springs. According to the anti-dropping tackle, the opening sealing mechanism adopts a plate like structure, the failure of the opening sealing mechanism caused by the collision between wires andthe opening sealing plate in the running process of a tackle is effectively prevented, and a stable and reliable working environment for aerial work is provided.

The invention discloses a scooter hub internally provided with a drive speed transmission. The scooter hub is characterized in that a hub is hollowly arranged, and the hub is internally provided with the drive speed transmission, wherein the drive speed transmission comprises a drive gear and a pair of driven gears, each driven gear is provided with a ratchet wheel, one side of the drive gear is meshed with the ratchet wheel of one driven gear, the other side of the drive gear is meshed with the ratchet wheel of the other driven gear through an intermediate gear, the inner circumference of the rim of the hub is provided with meshing teeth, the driven gears are meshed with the meshing teeth of the inner circumference of the rim, and the drive gear is in meshing connection with a driving handle. According to the scooter hub disclosed by the invention, the drive speed transmission is integrated with the hub and works to drive the hub to drive, so that the scooter hub has the advantages that the structure is compact, the assembly precision is high, the floor space is small, and the higher structure space optimization is realized; and in addition, the transmission of inner gears of the drive speed transmission is synchronous with the drive of the hub, so as to ensure that the instant transmission ratio is constant, the smoothness is high, the transmit movement is exact and reliable, the transmitted power is higher, the speed range is larger, larger transmission ratio is realized, and the transmission efficiency is high.

Disclosed is a lump coal bunker automatic unloading method. The lump coal bunker automatic unloading method includes the following steps that an ultrasonic wave sensor is added on a portion of an unloading dolly, where a coal falling groove is located, drop signals fed back by the ultrasonic wave sensor are collected by a programmable logic controller (PLC) in periodicity mode, and the result that whether the dolly moves or not is confirmed after the drop signals are compared with a set numerical value; when the unloading dolly moves, the PLC sends signals to a coal feeding hand wheel above a belt and enables the coal feeding hand wheel to stop feeding lump coal and a plow unloading machine of the unloading dolly is uplifted firstly, and then the whole unloading dolly moves forwards; when the unloading dolly moves to the terminal point of a coal bunker, the unloading dolly automatically returns to the initial point of the coal bunker, and the unloading dolly runs in continuous circulation mode. The lump coal bunker automatic unloading method is high in automatic degree, accurate in drop control, and safe, reliable and efficient in run, achieves work environment optimization of employees, prevents the employees from working in a work environment large in noise intensity and large in dust quantity for a long term, guarantees health of the employees, can guarantee continuity and reliability of production, guarantees that dropping points of the lump coal are located in a prescribed range, guarantees production rate of the lump coal, and improves economic benefit.

The invention discloses a new carbon foam material preparing method, including the steps as follows: (1) crushing massive material into 0.1-0.8 cu cm particles; (2) controlling pipeline temperature at -3-15 deg.C by cooling medium, using a feed pump to compress CO2 at 7.4MPa-40MPa by pressure control valve, heating up to above critical temperature 31 deg.C-100 deg.C, and then adding supercritical CO2 into melted pitch; (3) cooling the mixture of pitch and CO2 down to a temperature higher than pitch plastifying temperature by 50 deg.C and molding; (4) carbonating and graphiting the made pitch foamed body in the step 3, and finally making the carbon foam material. The beneficial effects of the invention are that: the made carbon foam material has uniform foaming holes, excellent-performance; and in preparing course, the operating environment is reliable and highly safe.

The invention discloses a communication outdoor cabinet, which belongs to the technical field of electrical equipment. A cylinder is arranged below the cabinet body, and a first disk gear is sleeved on the cylinder; a round table is arranged below the cabinet cover. The bottom of the round table is provided with a disk, the upper surface of the disk is provided with a groove, a servo motor is arranged in the groove, and a second gear is arranged on the output shaft of the servo motor. The second gear cooperates with the first disc gear; a lifting mechanism is arranged below the round platform. Compared with the prior art, the lifting mechanism of the present invention can raise the height of the communication cabinet, avoid water flow into the interior of the communication cabinet, and can intelligently analyze the heat level of the heat dissipation area, and then automatically adjust the position for intelligent heat dissipation, effectively It solves the heat dissipation bottleneck caused by the increase in power consumption of communication equipment, and is easy to operate and has a good heat dissipation effect, so that the communication equipment can work in a safe and reliable working environment.

The invention relates to a preparation method of carbon foam heat insulation material added with hollow ceramic balls. The method includes the following steps: (1) uniform mixing of raw materials: the foaming formula of phenolic foam comprises the steps: adding 3-5 parts of surfactant, 1-3 parts of foaming agent and 0-2wt% of hollow ceramic microballs to 100 parts of phenolic resin sequentially and uniformly dispersing the mixture by means of combining mechanical stirring and ultrasonic oscillation; (2) adding 5-9 parts of curing agent to the uniformly dispersed mixture of step (1) and after stirring, casting the mixture to a mold to be foamed and solidified, thus obtaining phenolic foam; and (3) carbonized heat treatment: after shelling treatment, putting the phenolic foam in a vacuum carbonization furnace to be heated to the temperature of 800 DEG C at the average rate of 0.5 DEG C / min under vacuum condition, thus obtaining the carbon foam heat insulation material. The high temperature heat insulation material has the advantages of light weight, high strength, low thermal conductivity, low coefficient of heat expansion, low cost, designability and the like.

A cooking device having the function of putting main material and ingredients comprises a cooking machine, an ingredient putting device and a feeding device; the cooking machine comprises a body and a wok mechanism; the body comprise a first frame and a second frame which are respectively positioned at two sides of the wok mechanism; rotating shafts are fixedly installed at two sides of the wok mechanism; the wok mechanism is rotationally installed on the first frame and the second frame through the rotating shafts; the wok mechanism comprises a wok body; a top opening of the wok body is fixedly provided with a material guiding device which is pocket-shaped; the opening of the material guiding device is upward and receiving-shaped; the material guiding device is positioned at the front and back of the wok body; the ingredient putting device is fixedly installed on the second frame; the feeding device is used for putting dish main material to the wok mechanism. By means of the device, manual putting of ingredient and main material can be replaced so as to increase work efficiency.

The invention discloses a carbon foam material with a core-shell structure and a preparation method thereof, that is, firstly, a mixed solution of polyacrylonitrile and borneol in N,N-dimethylacetamide is used as a sheath liquid, and acetone solution of borneol is used as a core liquid , the film-like material is prepared by a coaxial electrostatic spray device; then the film-like material is dried under the condition of elevated temperature and ventilation to obtain a solid mixed film material; and then the solid mixed film material is pre-oxidized, carbonized and high-temperature graphitized to obtain Carbon foam material with core-shell structure. The carbon foam material with a core-shell structure prepared by the invention has uniform and small cells, high controllability and excellent performance; the preparation process is simple and effective, the working environment is reliable, the safety is high, and it is suitable for industrial production.

The invention discloses a self-pushing launching device for improving the initial volume of a low pressure chamber and belongs to the technical field of weapon launching devices. The self-pushing launching device for improving the initial volume of the low pressure chamber comprises a launching barrel, a guided missile, more than two hydraulic oil cylinders and a layer board, wherein the more thantwo hydraulic oil cylinders are located in the launching barrel, the cylinder ends of the hydraulic oil cylinders are fixed to the step surface of the launching barrel, and the piston rod ends of thehydraulic oil cylinders are integrally connected to the layer board in the bottom of the launching barrel; the guided missile is located in the launching barrel, the bottom of the guided missile leans against the layer board, and a laval spray tube in the bottom of the guided missile penetrates through a centre hole of the layer board; in an initial state, the piston rods of the hydraulic oil cylinders are in an elongated state, and the laval spray tube in the bottom of the guided missile is in contact with the bottom of the launching barrel. The device disclosed by the invention can improvethe initial volume of the low pressure chamber, reduce overload of the guided missiles in the launching process, reduce the temperature of the bottoms of the guided missiles and reduce the pressure ofthe inner side of the launching barrel.

The invention discloses a fast cooling furnace body of a horizontal diffusion furnace. The fast cooling furnace body comprises a reaction quartz tube and a resistance furnace body arranged outside the reaction quartz tube in a sleeving manner. A columnar clearance with an annular cross section is arranged between the outer wall of the reaction quartz tube and the inner wall of the resistance furnace body. Sealing pieces are arranged at the two ends of the columnar clearance so that a closed ventilation channel can be formed by the columnar clearance. The resistance furnace body is provided with an air inlet for supplying air to the ventilation channel and air outlets for exhausting hot air in the ventilation channel. The fast cooling furnace body has the beneficial effects that the fast cooling function is achieved, and the influence of temperature fluctuation on a semiconductor part is reduced.

The utility model relates to a device with a function of monitoring the elevation angle change of a paver screed. The device comprises a laser emitting mechanism, a laser passing mechanism and a laser receiving mechanism, when an elevation angle is at an angle of normal paving, three laser rays emitted by an upper emitter, a middle emitter and a lower emitter of the laser emitting mechanism can be received by an upper receiver, a middle receiver and a lower receiver through gaps respectively; when the elevation angle is increased, the laser rays emitted by the lower emitter are shielded by the lower shielding plate, the lower receiver cannot receive the rays and transmits a signal to the controller, and the controller controls the leveling oil cylinder to extend and restore to the elevation angle when the leveling oil cylinder is balanced; when the elevation angle is reduced, the laser rays emitted by the upper emitter are shielded by the upper shielding plate, the upper receiver cannot receive the rays, a signal is transmitted to the controller, and the controller controls the leveling oil cylinder to shorten and restore to the elevation angle when the leveling oil cylinder is balanced; the adjusting device is small in size, convenient to transfer and install, capable of closely monitoring elevation angle changes, capable of ensuring paving quality and easy and convenient to debug.

The invention discloses a downhole petroleum formation fracturing string tension detecting instrument which comprises a tension gauge spindle. A pressure-tolerant outer pipe is sleeved on the outer wall of the tension gauge spindle. A sensor, a circuit board, a lithium battery component and a power switch device which are connected are sequentially disposed from top to bottom between the tension gauge spindle and the pressure-tolerant outer pipe. A lower connector is sleeved at the lower end of the tension gauge spindle. The detecting instrument is used for detecting downhole petroleum formation fracturing string tension. The sensor converts strain generated under axial tension of the spindle into impedance variation of strain gauges. The pressure-tolerant outer pipe separates and seals high-pressure downhole liquids to provide a reliable working environments for a tension gauge. A measuring and recording circuit on the circuit board converts the impedance variation into tension and stores data in real time. A lithium battery powers the tension gauge. The power switch is used for cutting off the battery during off-working state to save power. The detecting instrument is unique in design, simple in overall structure, and convenient to maintain.

The invention discloses a secondary curing kiln of building material products. The secondary curing kiln comprises a kiln body, a ventilation mechanism, a heat exchange device, a humidity measurement device, a temperature measurement device, a transporter, ground rails and a control device. Air in an air duct, driven by a fan, is heated or cooled by the heat exchange device and then delivered into the curing kiln. According to temperature and humidity information in the kiln body, the control device controls temperature and humidity in the kiln body through controlling the rotating speed of the fan, the opening angle of an air valve and the running of the heat exchange device. The control device drives wheels to rotate through a driving device and controls the transporter to transport materials to a target position. The secondary curing kiln can realize automation control over temperature and humidity in the kiln, is easy to realize, convenient to operate, high in automation degree, high in temperature and humidity control precision, and safe and reliable in work environment, provides a stable curing space for plate materials, can realize material automatic transporting, and can improve the production rate and quality of the products.

The invention relates to a ventilation device for a first space (7), in particular an engine room of a vehicle (1), comprising a chimney (9) extending from said first space (7), the chimney (9) comprising an inlet (11) and an outlet (13), wherein the inlet (11) is arranged in fluid communication with the first space (7) and the outlet (13) is in fluid communication with a surrounding atmosphere. The ventilation device (3) further comprises an auxiliary second space (15), the second space (15) being arranged adjacent the chimney (9) and being in fluid communication with the chimney (9) by meansof at least one opening (17), wherein an airflow flowing from the auxiliary second space (15) to the surrounding atmosphere via the chimney (9) causes an ejector effect in the chimney (9) which ventsair from the first space (7). The invention also relates to a vehicle (1) comprising a ventilation device (3) and a method for venting a first space (7) by using a ventilation device (3).

The invention relates to a mine explosion-proof and intrinsically-safe type intelligent alarm vacuum switch. The switch is technically characterized by comprising an upper computer, a centralized-control mainboard, a disconnecting switch assembly, a contact assembly, a comprehensive leakage base plate and an intrinsically-safe keyboard, wherein the upper computer is connected with the centralized-control mainboard to monitor communication equipment states and realize an alarm function; the upper computer is connected with the disconnecting switch assembly, the contact assembly, the comprehensive leakage base plate and the intrinsically-safe keyboard to realize an information collection or control command sending function; the comprehensive leakage base plate is connected with a zero-sequence current transformer to collect leakage currents so as to realize a leakage protection function; and the contact assembly is connected with controlled equipment to realize a function of starting and stopping control of the controlled equipment. According to the switch, possible faults between two sets of equipment and man-made operation fault risks are greatly reduced, a safer and more reliable work environment is provided for mine operations, and the switch has the characteristics of high automation degree, safety, reliability, low cost and the like.