43results about How to "Smooth escape" patented technology

The invention provides a high-altitude falling and drowning safety guaranteeing system for an automobile and a control method thereof, which belongs to the technical field of automobiles. A problem of the prior art that the safety is not high is solved. The high-altitude falling and drowning safety guaranteeing system for the automobile comprises a control unit, an immersion sensor, a weightlessness signal sensor, a door lock controller, an automobile window controller and an engine controller, wherein the immersion sensor and the weightlessness signal sensor are connected with an input end of the control unit; and the door lock controller, the automobile window controller and the engine controller are connected with an output end of the control unit. The high-altitude falling and drowning safety guaranteeing control method for the automobile comprises the following steps of exerting the control unit to receive signals transmitted by the weightlessness signal sensor and the immersion sensor and to analyze and judge the received signals; and exerting the control unit to send a control signal to control automobile window closing, automobile door unlocking and engine fuel cutoff when a high-altitude falling accident or a drowning accident is judged. The high-altitude falling and drowning safety guaranteeing system for the automobile and the control method thereof, provided by the invention, is advantaged in that safety measures such as automobile door unlocking, fuel cutoff and so on are automatically executed for passengers on the automobile to escape in case of high-altitude falling and drowning.

The invention provides a dynamic obstacle avoiding system for a capturing process of an industrial robot and a method of the dynamic obstacle avoiding system. The dynamic obstacle avoiding system comprises a rejection vector module, an eddy algorithm module and a dynamic obstacle avoiding algorithm module. The rejection vector module is used for establishing a relative motion relationship between an end effector and an obstacle to obtain a rejection vector; the eddy algorithm module is used for updating the direction of the rejection vector according to an eddy algorithm; and the dynamic obstacle avoiding algorithm module is used for acquiring the position of the end effector according to the rejection vector so as to avoid the obstacle. By the dynamic obstacle avoiding algorithm, the industrial robot successfully avoids the obstacle and finishes capturing under the condition that the moving obstacle exists in an industrial complex environment.

The invention discloses a preparation method of a foamed nickel-based photothermal conversion material and relates to a preparation method of a photothermal conversion material. The invention aims to solve the problem of relatively great heat loss and complex preparation process, relatively high cost and relatively large occupied area as a liquid needs to be heated integrally in conventional photothermal conversion. The preparation method comprises the following steps: I, foamed nickel pre-treatment; and II, solvothermal reaction to obtain the foamed nickel-based photothermal conversion material. The photothermal conversion material prepared by means of a hydrothermal method is a semiconductor material in a flower-type structure formed by clustering a plurality of needle substances. The photothermal conversion material has relatively high absorptivity and can fully absorb light, the wavelengths of which are 0.25-2.5 [mu]. In addition, the material has excellent photothermal conversion performance and can fully convert absorbed light energy into heat energy and evaporate water on the surface of a microstructure of the material. The preparation method disclosed by the invention can be used for obtaining the foamed nickel-based photothermal conversion material.

The invention relates to a fire safety emergency window, which belongs to door and window technology field. The invention provides an escape emergency door (window) when in short burst fire, the door (window) can sense fire automatically, and it can be opened in emergency and has function of anti-burglary. It includes a door frame or window frame, door (window) board and spindle. The door is arranged in the door frame; a spindle is arranged under the door (window) board, a supporting bracket for fixing the door (window) is arranged on the door (window) frame, an automatic sensing device is assembled between the door (window) board and the supporting bracket. The automatic sensing device is made up of intelligent pin and spring, the spring is assembled between the door (window) board and the supporting bracket, the intelligent pin penetrates the door (window) board, spring and the supporting bracket, then it is bent, the intelligent pin is made up of shape memory alloy material, the temperature of shape fully restoration is 35-95deg.C. The spring may be normal spring, or made up of shape memory alloy material.

The invention relates to a high-rise escape device which comprises a chassis and a rotating disk wound with a steel wire rope, wherein a one-way clutch and a speed control mechanism are mounted in the chassis; a support shaft on one side of the one-way clutch extends out of the chassis and is linked with a rotating shaft of the rotating disk; the speed control mechanism comprises a friction braking and rotational speed regulating component and a gear rotational speed regulating component; the friction braking and rotational speed regulating component comprises a stepped shaft, a centrifugal clutch and a first gear with an internal thread; an outer ring of the centrifugal clutch is an outer gear; the gear rotational speed regulating component comprises a second gear, a third gear and a backstop device; an auxiliary shaft is rotatably mounted in the chassis; the second gear, the third gear and the backstop device are mounted on the auxiliary shaft; the backstop device is positioned between the second gear and the third gear; the second gear is meshed with the outer gear; and the first gear is meshed with the third gear. The invention provides the high-rise escape device which is high in reliability, convenient for mounting and stable for working.

A bearing body for rotatably supporting a drive shaft for driving an impeller on a watercraft body includes a bearing chamber containing bearing members rotatably supporting the drive shaft. Seal members are disposed on both sides of the bearing members and partition the bearing chamber by making contact with an outside circumferential surface of the drive shaft. The seal members are disposed so that grease in the bearing chamber does not leak out through the contact portions between the seal members and the outside circumferential surface of the drive shaft, and a breather passage is communicated with the bearing chamber. Two bearing members within the bearing chamber have a space formed between the bearing members, e.g., to form a grease reservoir between the bearing members. The aforementioned bearing structure reduces the necessity of maintenance, e.g., supplying grease to a drive shaft bearing portion, or at least the reduces the required frequency of maintenance.

The invention discloses a suspended fireproof aseismic door which comprises an upper steel structure supporting member, corner supporting members, an inner door frame, an outer door frame and a lower steel structure supporting member. The upper steel structure supporting member is arranged on a wall and positioned below a lintel, the lower steel structure supporting member is fixed on the ground, the upper end of the outer door frame is fixedly connected to the upper steel structure supporting member while the lower end of the same is connected to the lower steel structure supporting member, and the outer door frame is mounted in the wall; the inner door frame is arranged in the outer door frame, four corners of the inner door frame and those of the outer door frame are connected through the corner supporting members, each corner supporting member comprises a compression barrel, a compression rod and a connection rod, each compression sleeve slidably sleeves outside the corresponding compression rod, a spring is arranged between the bottom end of each compression rod and the bottom of the corresponding compression barrel, the front end of the compression rod is connected to the connection rod through a spherical hinge, and a door leaf is arranged in the inner door frame. The suspended fireproof aseismic door is high in safety and can still be used when an earthquake occurs or a house naturally deforms.

The invention discloses a security door locking-prevention method. The method comprises S1, arranging a sensor module at the inner side of a door plate, wherein the sensor module is used for acquiring a door opening instruction and in a normal state, a primary power supply supplies power for the sensor module, S2, arranging an emergency power supply for supplying power for the sensor module, S3, detecting a power supply state of the primary power supply in real time and controlling operation of the emergency power supply according to the detection result and S4, controlling opening of a security door lock catch structure according to the door opening instruction acquired through the sensor module. The emergency power supply can realize normal work of the sensor module under power shortage caused by primary power supply abnormality so that it is avoided that the stopped sensor module cannot acquire a door opening instruction so that when an accident occurs, an indoor people cannot open the security door and escape. Through the emergency power supply, the sensor module can acquire a door opening instruction in real time and prevent accident generation.

The invention relates to an intelligent industrial and mining helmet which comprises a protective mask provided with a first pressure sensor, a filtering device which is connected with the protective mask through a pipeline and is provided with a second pressure sensor and a ventilator, and a helmet body which is connected with the protective mask and provided with a processor, wherein the processor is configured to receive data transmitted by the first pressure sensor and the second pressure sensor so as to enable the ventilator to adjust the ventilation quantity. The processor can be further configured to receive human body vital sign parameters such as the heart rate frequency, the breathing frequency and the pulse frequency of the user and obtain the content of a harmful gas in the environment, and when any one of the heart rate frequency, the breathing frequency, the pulse frequency and the content of the harmful gas exceeds a preset normal range, the control valve and the buzzer are triggered to be started; the potential danger in the current environment is alarmed; and when the content of the harmful gas exceeds the preset normal range, the oxygen generator is triggered to be started to supply oxygen to the protective mask so that the user can escape smoothly.

The invention discloses an automobile B-pillar reinforced panel and a manufacturing method thereof and belongs to the field of automobile parts. The automobile B-pillar reinforced panel comprises a reinforced panel outer shell and an inner layer stiffening plate, wherein an open groove is formed in the middle part of the reinforced panel outer shell. The inner layer stiffening plate is fixed in the open groove of the reinforced panel outer shell and is made of carbon fibre composite material. The automobile B-pillar reinforced panel has the advantages that the space, on the reinforced panel outer shell, occupied by the inner layer stiffening plate is reduced; strong shock resistance, high strength and light mass are realized; the automobile B-pillar reinforced panel is guaranteed to be uneasy to deform when the side surface of an automobile body suffers a collision so that injuries of people in the automobile are avoided; and meanwhile, an automobile door can be normally opened to ensure that the people in the automobile smoothly escape.

The invention relates to a high-rise escape device which comprises a chassis and a rotating disk wound with a steel wire rope, wherein a one-way clutch and a speed control mechanism are mounted in the chassis; a support shaft on one side of the one-way clutch extends out of the chassis and is linked with a rotating shaft of the rotating disk; the speed control mechanism comprises a friction braking and rotational speed regulating component and a gear rotational speed regulating component; the friction braking and rotational speed regulating component comprises a stepped shaft, a centrifugal clutch and a first gear with an internal thread; an outer ring of the centrifugal clutch is an outer gear; the gear rotational speed regulating component comprises a second gear, a third gear and a backstop device; an auxiliary shaft is rotatably mounted in the chassis; the second gear, the third gear and the backstop device are mounted on the auxiliary shaft; the backstop device is positioned between the second gear and the third gear; the second gear is meshed with the outer gear; and the first gear is meshed with the third gear. The invention provides the high-rise escape device which is high in reliability, convenient for mounting and stable for working.

The invention relates to the technical field of advanced packaging technologies for integrated circuits, and specifically relates to a semiconductor device for correcting warpage of a plastic packaging panel containing an integrated circuit chip and a correction method. The semiconductor device comprises a load-bearing structure, a vacuum channel, a pressing structure and a heating structure, wherein the load-bearing structure is used for bearing a load-bearing area of the plastic packaging panel, and the load bearing area is set to be a plane; the vacuum channel is arranged on the load-bearing structure, communicated with the load-bearing area, and used for applying vacuum to a gap between the plastic packaging panel and the load-bearing area; the pressing structure is arranged above theload-bearing structure and moves back and forth in a direction perpendicular to the load-bearing area, the pressing structure is provided with a pressing end which is arranged corresponding to the plastic packaging panel and used for applying correction pressure to a part without a bare chip of the plastic packaging panel, and the contact surface between the pressing end and the plastic packagingpanel is a plane; and the heating structure is arranged on the load-bearing structure and / or pressing structure and used for heating the plastic packaging panel. The semiconductor device of the invention is not easy to damage the bare chip during correction and is good in correction effect.

The invention relates to a filter, and in particular relates to a structural improvement of a toxic and harmful gas filter. The toxic and harmful gas filter comprises a housing (1), an air inlet (6) and an air outlet (7), wherein the air inlet (6) and the air outlet (7) are arranged on the housing (1) and communicated with the interior of the housing (1), and an air purifying device and an air circulating device are further arranged in the housing (1). Therefore, the toxic and harmful gas filter has the following advantages: 1) the design is reasonable, and the structure is simple and practical completely; 2) the toxic and harmful gas filter can provide a closed life-saving cabin which can enable trapped people to enter rapidly when a mine disaster happens suddenly under the unexpected state, provide a safe and reliable living space, enable the trapped people to avoid the disaster smoothly and reduce casualties; and 3) the toxic and harmful gas can timely and effectively filter and purify generated harmful gas during the duration of existence of the people to be rescued during the period of waiting for rescue of the people, and avoid harming life safety of the trapped people due to gathering of the harmful gas.

The invention provides an epitaxial wafer, a preparation method of the epitaxial wafer and a light-emitting diode chip, and belongs to the technical field of photoelectron manufacturing. The epitaxial wafer comprises a sapphire substrate and an epitaxial layer, wherein the epitaxial layer is positioned on the surface of the sapphire substrate; the surface, close to the epitaxial layer, of the sapphire substrate is provided with a plurality of protruding structures, the protruding structures are arranged at intervals, and the refractive index of the protruding structures is between the refractive index of the sapphire substrate and the refractive index of the epitaxial layer. The problem that photons cannot escape due to the fact that the photons form total reflection at the junction of the sapphire substrate and the epitaxial layer can be solved, and the light-emitting efficiency of the light-emitting diode is improved.

The invention relates to a methanol gas water washing tank, which comprises a horizontal tank body, wherein the top portion of the horizontal tank body is provided with a methanol gas inlet and a purifying gas outlet, the bottom portion of the horizontal tank body is provided with a purifying water inlet, a sealing head close to the purifying gas outlet is provided with an overflow water outlet, the middle portion of the inner cavity of the horizontal tank body is provided with a buffer reflux chamber, the upper portion of the buffer reflux chamber is a gas phase space, the lower portion of the buffer reflux chamber is a water washing space, the top plate and the bottom plate of the buffer reflux chamber are respectively provided with small pipe installing holes for installing purifying gas riser pipes and reflux bending pipes, the reflux bending pipe is communicated to the buffer reflux chamber and the water washing space, and the purifying gas riser pipe is communicated to the waterwashing space and the gas phase space. According to the methanol gas water washing tank of the present invention, by completely utilizing the combination of buffering and uniform gas flow distribution, the water washing of the methanol gas can achieve smooth flow and good absorption effect.

The invention discloses a building block for a water conveyance canal. The building block comprises a block body laid on each canal wall at both sides of the water conveyance canal; one side, which is towards the canal wall, of the block body is provided with a soil retaining body; one side, which is towards water, of the block body is provided with a waterward body; a connecting body extending along the height direction of the block body is arranged between the soil retaining body and the waterward body; the upper lateral surface of the connecting body is respectively lower than those of the soil retaining body and the waterward body; the lower lateralsurface of the connecting body respectively extends towards both the sides along the width direction of the block body to form rib plates; the lower lateral surfaces of the rib plates are respectively higher than those of the soil retaining body and the waterward body; two end faces of the soil retaining body in the height direction and two end faces of the soil retaining body in the width direction are respectively provided with grooves connected end to end. The building block has the beneficial effect that the building block is beneficial for preventing water resource loss, is beneficial to growth of fish and aquatic plant and is beneficial for successfully escaping in the emergency.

The invention relates to a compressed air energy storage passenger car window breaking device, and belongs to the technical field of passenger car rescue and safety. The window breaking device comprises a cylinder body and an actuation device, and is characterized in that the cylinder body includes an upper cylinder body and a lower cylinder body; the upper cylinder body is provided with an intake hole for achieving the effects of air storage and drainage; the actuation part is mounted on the lower cylinder body, and includes a percussion handle, a sealing pressure rod, a guide sleeve and a piston impact head; the lower cylinder body is divided into a guide cavity and a working cavity; the guide cavity is provided with the sealing pressure rod and the guide sleeve; the end of the sealing pressure rod is connected with the percussion handle by a thread; and the working cavity is provided with the piston impact head. The pneumatic window breaking machine with the structure is mounted on a glass car window angle; a high-pressure air source is leaded in from the intake hole of the upper cylinder body; the percussion handle is powerfully pressed down; a gap is formed between the sealing pressure rod and the guide sleeve; high-pressure air currents enter the working cavity from the guide cavity of the lower cylinder body; and the piston impact head is popped out under the effect of high-pressure gas to break car window glass.

The invention discloses a burglarproof door convenient for escape. The burglarproof door comprises a door frame and a door body, wherein the door body is hinged with the interior of the door frame; the burglarproof door is characterized by further comprising detection devices, an inner door and executive device, wherein the detection devices are mounted in all indoor rooms; the detection devices and the executive device form wireless connection; the inner door is mounted on the door body; the executive device is mounted in the door body; the executive device can open and lock the inner door. The inner door can be timely opened in case of earthquake, and people can escape by opening the inner door, so that the escape probability of personnel can be greatly improved.

The invention relates to the technical field of building machinery, and discloses a mechanical arm, a hole plugging device and a hole plugging robot. The mechanical arm comprises a swing arm mechanism, a plugging head rotating mechanism and a turnover mechanism; the connecting end of the swing arm mechanism can rotate around a first axis parallel to the construction face so as to drive the swing end of the swing arm mechanism to swing in the direction close to or away from the construction face; the plugging head rotating mechanism is arranged at the swing end of the swing arm mechanism, the plugging head rotating mechanism is connected with the plugging head and can drive the plugging head to rotate around a second axis, the working face of the plugging head is adjusted to be parallel to the construction face, and the second axis is parallel to the first axis; and the turnover mechanism is connected with the connecting end of the swing arm mechanism, and the turnover mechanism can drive the swing arm mechanism to turn over in a vertical plane perpendicular to the construction face so that the swing arm mechanism can avoid obstacles. According to the mechanical arm, the plugging head can be driven to realize automatic plugging of a hole, and the plugging efficiency and the plugging quality are improved.

The embodiment of the invention provides an opening and contracting device and a drilling probe. The opening and contracting device comprises an accommodating pipe for accommodating the drilling probeand an opening and contracting pipe connected with the accommodating pipe; the opening and contracting pipe comprises at least two metal sheets, all the metal sheets at one end of the opening and contracting pipe are connected with the accommodating pipe, all the metal sheets at the other end of the opening and contracting pipe are connected through an opening and contracting device body, the opening and contracting device body is connected with all the metal sheets through telescopic supports separately, so that all the metal sheets are uniformly distributed on the circle with the opening and contracting device body as the circle center, and the metal sheets at one end of the opening and contracting pipe are opened or contracted by controlling all the telescopic supports to stretch out and draw back. By arranging the accommodating pipe for accommodating the drilling probe and controlling the opening and contracting device body to be opened and contracted, sand and crushed stones above the drilling probe are in the movable state or are decomposed or drop to the bottom of a hole, the drilling probe can successfully escape when a hole jam accident occurs in a drill hole, and the probability of hole jam damage to the probe is effectively reduced.

The invention belongs to the technical field of electronic products and particularly provides a smoke detector with anion generation and illumination in a smoke state. The smoke detector comprises a shell (1), an internal power source circuit, a smoke detection and control circuit, an alarming horn and an alarming horn power source. Yellow light LED illumination lamps (2) installed on the periphery of the shell (1) are connected with the alarming horn power source and are connected with the alarming horn in parallel. An anion generator (3) is further installed at the lower end of the shell (2) and is electrically connected with the internal power source circuit through a switch (4). According to the smoke detector, the yellow light LED illumination lamps (2) capable of automatically providing illumination in a smoke environment and the anion generator are additionally installed on the smoke detector, people can successfully escape in the environment full of smoke, and the healthcare efficacy of anions can be used at ordinary times to promote body health.

The invention relates to an automotive door lock of an automobile. The automotive door lock comprises a lock body fixedly connected to an automotive door, wherein the middle part of a lock stopping plate of the lock body is hinged with the framework of the lock body; the end of the lock stopping plate is hinged with the rear end of a transverse bumper; the front end of the transverse bumper is hinged with a rotary clip; the rotary clip is hinged with the automotive door; a vertical bumper is hinged with the rotary clip; and the vertical bumper and the transverse bumper form axial transmission fit along two bumper shafts through the rotary clip. The automotive door lock is characterized in that: the rear end of the transverse bumper is hinged with the lower end of the lock stopping plate; and when a vehicle knocks the transverse bumper from the front side to move forwards so as to pull the lower end of the lock stopping plate to move forwards, the lock stopping plate inevitably anticlockwise rotates around a hinged shaft at the middle part, and the lock stopping plate drives a lock stopping pull rod to act to make the lock body in an unlocking state so as to ensure that a driver can successfully escape. The automotive door lock has the advantages of great improvement on use safety, low cost of an automotive door lock system, wide use, and suitability for modification of old-style lock systems.

The invention discloses an automotive water sensor detection device. The device is characterized by comprising a water sensor; the output end of the water sensor is connected to a drive circuit, a switch circuit and a central control system sequentially; an amplify circuit is arranged between the output end of the water sensor and the output end of the drive circuit; the device comprises a reset circuit used for resetting the switch circuit; the water sensor is a flow sensor or level sensor. By the aid of the device, the safety of an automobile can be improved, passengers in the automobile can escape by opening doors and windows smoothly, and the number of drowning casualties can be decreased greatly and accordingly. The device serving as an automobile water incoming automatic unlocking one is widely applied to automobiles.

The invention discloses a mobile greenhouse weeding mechanism based on three-coordinate. The mechanism comprises an integral structural frame, a three-coordinate mobile module, a wheel drive and an end executor; the integral structural frame is composed of 16 aluminium profiles of different lengths, so that the integral structure is divided into a bottom layer, a lower layer, a middle layer and anupper layer, wherein the bottom layer is connected with the wheel drive; the lower layer and the upper layer paly a protective role, and the middle layer is fixedly connected with the three-coordinate mobile module. The mechanism can well adapt to irregular terraces and farmlands with a large number of drainage ditches constructed for drainage. Because the mechanism has larger wheels, it can be guaranteed that the weeding accuracy cannot be affected by the uneven ground during traveling. Because a large amount of remaining space exists in the lower portion of the mechanism, and the movement of the end executor is very convenient, it can be ensured that the mechanism can smoothly avoid obstacles when encountering the obstacles, and it can be prevented that the weeding operation is affecteddue to the sensitive weeding end executor is damaged.

The invention relates to a fire safety emergency window, which belongs to door and window technology field. The invention provides an escape emergency door (window) when in short burst fire, the door (window) can sense fire automatically, and it can be opened in emergency and has function of anti-burglary. It includes a door frame or window frame, door (window) board and spindle. The door is arranged in the door frame; a spindle is arranged under the door (window) board, a supporting bracket for fixing the door (window) is arranged on the door (window) frame, an automatic sensing device is assembled between the door (window) board and the supporting bracket. The automatic sensing device is made up of intelligent pin and spring, the spring is assembled between the door (window) board and the supporting bracket, the intelligent pin penetrates the door (window) board, spring and the supporting bracket, then it is bent, the intelligent pin is made up of shape memory alloy material, the temperature of shape fully restoration is 35-95deg.C. The spring may be normal spring, or made up of shape memory alloy material.

The invention discloses an automobile B-pillar reinforcement plate and a manufacturing method thereof, belonging to the field of automobile parts. The B-pillar reinforcement plate of the automobile comprises: a reinforcement plate shell and an inner layer reinforcement plate. Wherein, an opening groove is arranged in the middle part of the reinforcing plate shell. The inner reinforcing plate is fixed in the opening groove of the shell of the reinforcing plate, and the material is carbon fiber composite material. The automobile B-pillar reinforcement plate provided by the invention not only reduces the space occupied by the inner layer reinforcement plate on the reinforcement plate shell, but also makes the automobile B-pillar reinforcement plate have the characteristics of strong shock resistance, high strength and light weight, ensuring When the side of the car body is collided, the B-pillar reinforcement plate of the car is not easy to deform, so as to avoid damage to the occupants of the car, and at the same time, the door can be opened normally to ensure the smooth escape of the occupants in the car.

The invention discloses an intelligent early warning and fire extinguishing system and relates to the intelligent monitoring and fire fighting apparatus which is used in floor added rebuilt private house groups, dormitories, colored steel makeshift houses, regions where electric bicycles are concentrated, collective kitchens where liquefied gas cookers are used and integrates smoke concentration early warning, liquefied gas leakage early warning, toxic gas early warning, emergency lamp lighting, emergency exit signboard indication, loudspeaker early warning, voice guiding and fire extinguishing agent spraying. When a fire disaster occurs, smoke monitoring, combustible gas leakage monitoring, toxic gas monitoring and early warning can be immediately started, a system controller controls a loudspeaker to give an alarm through soft, voice guiding, emergency lamp lighting and emergency exit signboard lighting are carried out, a fire extinguishing agent is sprayed to an ignition point of anear bicycle parking region, and a movable terminal automatically calls fire alarm 119 and sends position information.

The invention discloses a security door locking-prevention method. The method comprises S1, arranging a sensor module at the inner side of a door plate, wherein the sensor module is used for acquiring a door opening instruction and in a normal state, a primary power supply supplies power for the sensor module, S2, arranging an emergency power supply for supplying power for the sensor module, S3, detecting a power supply state of the primary power supply in real time and controlling operation of the emergency power supply according to the detection result and S4, controlling opening of a security door lock catch structure according to the door opening instruction acquired through the sensor module. The emergency power supply can realize normal work of the sensor module under power shortage caused by primary power supply abnormality so that it is avoided that the stopped sensor module cannot acquire a door opening instruction so that when an accident occurs, an indoor people cannot open the security door and escape. Through the emergency power supply, the sensor module can acquire a door opening instruction in real time and prevent accident generation.