53results about How to "Control stop" patented technology

The invention discloses a mining operation multi-operation realization method based on virtual reality and augmented reality, and belongs to the technical field of the virtual reality and the augmented reality. The method comprises two patterns including the virtual reality and the augmented reality. Under a virtual reality scene, the selection and the replacement of a material and a material in the virtual reality scene can be realized, scene exploration is realized, the model can be moved and placed at will, a video is embedded, a two-dimensional code is generated, and a trigger realizes natural interaction, voice interaction and the like; under an augmented reality scene, the model can be selected, voice is played, the operation dynamics of the model can be demonstrated, and the rotation stopping, screen capture and function expansion of the model can be controlled; and under two patterns, various interaction ways of voice control, gesture control and keyboard mouse control can be realized. The method is applied to the virtual simulation application scene of the mining operation, can be used for training mine lot mining workers and students of the mining engineering specialty, reducing training capital and improving the skills of workers and provides an advanced and quick meaning for guiding production construction and science and technology studies.

The present invention is continuous drilling flow rate capable of predicting coal draft outburst and its apparatus. By means of the method of drilling holes in the coal bed drilling direction for data acquisition and the apparatus comprising hole sealing capsule unit, solid-gas separator, filter, coal bit controller, electric rock drill with connected displacement sensor LXC, controller unit KZ with explosion resistant enclosure and connected computer data acquisitor SC, the present invention can determine the gas distribution in the drilling direction, obtain the gas flow rate distribution curve along the drilling depth during coal bed drilling process, so as to determine the distance of soft coal containing high pressure gas to the ground, judge the distance to the place with maybe outburst. The present invention has compact reasonable structure, high accuracy and stable and reliable measurement result, and may be used widely.

The invention relates to an electrostatic jetting device, in particular to a continuously working and controllable electrostatic jetting device. The invention provides a continuously working and controllable electrostatic jetting device capable of controlling the starting and stopping of electrostatic jetting and stably jetting single jet stream for a long time. The device is provided with a hollow jetting head, lower and upper channels of the jetting head, a conductor probe, an insulated sealing sleeve, an electric spiral adjuster, a liquid supply device, a switch valve, a negative pressure chamber, a high voltage relay, an electrostatic high voltage power supply, an electrically conductive relay, a controller and a collecting plate, wherein the lower end of the hollow jetting head is provided with a nozzle while the upper end of the hollow jetting head is provided with a seal cover; the conductor probe is arranged inside the hollow jetting head and is fixed inside the insulated sealing sleeve, the liquid supply device is communicated with the hollow jetting head through the upper channel of the jetting head, the lower channel of the jetting head is communicated with the negative pressure chamber, the conductor probe is connected with the common end of the high voltage relay, the normally open end of the high voltage relay is connected with an anode of the electrostatic high voltage power supply, a casing of the hollow jetting head is connected with the common end of the electrically conductive relay, and the collecting plate is arranged right below the lower end of the conductor probe.

The invention provides a control method of an electric rice cooker. The electric rice cooker comprises a cooker cover, an inner pot, a rotating driving device, a heating device, a cover opening induction device and a controller; the rotating driving device drives the inner pot to rotate, the heating device heats the inner pot, the cover opening induction device is used for detecting whether the cooker cover is in an opened or closed state, and the controller is connected with the cover opening induction device, the heating device and the rotating driving device. When the cover opening induction device detects that the cooker cover is in the opened state, the controller controls the inner pot to stop working or rotate in a speed reducing mode. According to the control method of the electric rice cooker, in the rice cooking process, if a user opens the cooker cover carelessly, the cover opening induction device can detect that the cooker cover is in the opened state in time, the rotating speed of the inner pot is controlled to be decreased through the controller, and the situation that the user is scalded due to the fact that the inner pot rotates at a high speed, and rice water is thrown out of the inner pot is avoided.

A sheet conveying system in which when a sheet is passed from a sheet conveying apparatus to another, each including a sheet conveyance controller, the receiving apparatus can smoothly control acceleration, deceleration, or stop of conveyance of the sheet. A first sheet conveying device includes a first conveying roller pair to nip and convey a sheet, a releasing mechanism to release nipping of the sheet by the first conveying roller pair, and a first controller to control the first conveying roller pair and the releasing mechanism. A second sheet conveying device includes a second conveying roller pair to nip and convey the sheet conveyed by the first sheet conveying device, a second controller to control the second conveying roller pair, and a detecting device to detect position of a sheet. In response to the detection by the detecting device, the second controller causes the releasing mechanism to release the nipping of the sheet by the first conveying roller pair.

The invention provides a device for detecting a steel tie rod or an inhaul cable and application. A rod section detection mechanism which can stretch and retract relative to a fixing frame is installed in the fixing frame. Sensors are evenly installed in the plane, in the same vertical axis direction as an outer fixing ring, of the inner wall of an inner fixing ring. A lug base detection mechanism used for detecting a lug base of the detected steel tie rod or inhaul cable is installed on the fixing frame. The device is used for detecting the application of the steel tie rod or the inhaul cable through a metal magnetic memory detecting method. The inner diameter of a detection cavity can be adjusted immediately according to the diameter changes of the detected steel tie rod or the inhaul cable, and the adaptability is good. A detection gap produced by reducing when the outer fixing ring is expanded can be filled in time, and therefore a reducing detection ring is a complete detection ring both before and after reducing; due to the fact that the sensors are evenly distributed, comprehensive detection can be achieved, and the detection accuracy is greatly improved. The rod section of the detected steel tie rod or inhaul cable is detected, and meanwhile the lug base of the detected steel tie rod or inhaul cable is comprehensively detected.

The invention discloses a novel liquid spot-spray torch and a spot-spray method thereof, comprising a torch body, an air guide cone and a nozzle. The torch body is provided with a liquid inlet, an air inlet and a negative pressure port, the torch body is internally provided with a first liquid storage cavity and a first air cavity, the liquid inlet is communicated with the first liquid storage cavity, one end of the air inlet is communicated with the first air cavity, the other end of the air inlet is connected with a piezoceramic direct-drive valve which is connected with a first pressure adjusting valve, the negative pressure port is close to a liquid incoming end of the torch body, one end of the negative pressure port is communicated with the first liquid storage cavity, the other end of the negative pressure port is connected with a negative pressure generator, the air guide cone is connected with a liquid outgoing end of the torch body, the air guide cone is internally provided with a second liquid storage cavity which is communicated with the first liquid storage cavity, the nozzle sleeves the liquid outgoing end of the torch body, and the inner wall of the nozzle and the outer wall of the air guide cone form a second air cavity which is communicated with the first air cavity. The novel liquid spot-spray torch and the spot-spray method thereof have the advantages that the spraying requirements for high frequency and high precision can be met, high-speed spot spraying can be implemented, and production efficiency can be improved.

The invention discloses a cleaning lubricating oil adding device for a household electric control system, belonging to the field of mechanical maintenance of electrical control equipment. The cleaninglubricating oil adding device comprises an operating table and an oil storage tank placed on the operating table, wherein a fuel injection port is formed in the top end of the oil storage tank; a mounting plate is fixedly connected to the side wall of one end of the operating table, and is fixedly sheathed in an injection tube; a hollow through cavity in which the injection tube is inserted is formed in the side wall of the mounting plate, and the upper end of the injection tube is provided with a T-shaped push rod in a penetrating manner; the injection tube penetrates through the lower end of the T-shaped push rod, which is fixedly connected with a piston. The injection tube and a lubricating oil conveying device cooperate to accurately control the adding amount of lubricating oil; at the same time, the lubricating oil conveying device is provided with a plurality of oil-distributing hoses which can be operated separately, and the adding amount of the oil-distributing hoses can be selected according to the actual adding condition, thereby improving adding flexibility of the lubricating oil.

The invention discloses a multi-functional creeper for automobile repair. During usage, a repairer slides to the bottom of an automobile firstly and then presses down brake handles so as to achieve the effect of braking of sliding wheels; meanwhile, in the automobile repair process, the repairer can pull repair boxes to appropriate positions; the repairer can also operate illuminating lamps to achieve effective illumination at the same time; and under the situation that the repairer needs to raise the head, the repairer can pull up push handles firstly so as to enable clamping boards to slide out of clamping grooves and then make the push handles slide towards a rotating board along push holes so as to enable push rods to jack up the rotating board, and accordingly the head of the repairer is raised finally. By means of the multi-functional creeper for automobile repair, the repairer not only can conveniently control the creeper to move and stop, but also can conveniently take repair tools, and effective illumination can be achieved by means of the illuminating lamps when the repairer cannot clearly see a repair position, so that conveniences are brought to the repairer and meanwhile the work efficiency of the repairer is also greatly improved.

The present invention relates to an automatic fillet welding device, which can reliably detect the tip end and the tail end of the fillet welding range in any environment, wherein in a welding apparatus (1) with a trolley (3) traveling on a plate material (A), at the periphery of guide rollers (3h, 3i) rotating on a plate material (B) fillet-welded on the plate material (A), there are provided proximity sensors (3j, 3k).additionally, the side surfaces (31, 3m) of the trolley are respectively provided with proximity sensors (3p, 3q) for detecting the plate material (A) on which the trolley travels. Each proximity sensor uses an eddy current sensor for detecting a plate material of magnetic mechanism. When any one of the proximity sensors (3p, 3q) do not detect the plate material (A), or any one of the proximity sensors (3j, 3k) do not detect the plate material (B), the welding of a welding gun is stopped. But, when the proximity sensors (3p, 3q) are all in the period of detecting the plate material (A), the trolley continuously travels.

The invention discloses a permanent-magnet novel electromagnetic relay, and belongs to the technical field of electromagnetic relays. The permanent-magnet novel electromagnetic relay comprises a housing, an electromagnetic-permanent magnet system, a driving mechanism and a contact contacting system, wherein the electromagnetic-permanent magnet system, the driving mechanism and the contact contacting system are arranged in the housing, one end of the driving mechanism moves in the electromagnetic-permanent magnet system, and the other end is connected with the contact contacting system. According to the invention, the electromagnetic-permanent magnet system and the contact contacting system are combined, an electromagnetic force provided by the electromagnetic-permanent magnet system is converted into a pushing force of the contact contacting system, then the contact is stabilized at the limit position according to the magnetic force of the permanent magnet, and the working stability ofthe electromagnetic relay is improved. The electromagnetic relay of the invention can effectively provide a great pushing force, has the characteristics of simple structure, small volume, good assembly and good manufacturability, and has broad market prospects in the application and popularization of electrical circuits.

The invention provides ventilating, defogging and ammonia removing equipment for a cowhouse. The equipment is matched with an ammonia removal monitoring device and used for ventilating, defogging and ammonia removing work of the cowhouse. The ventilating, defogging and ammonia removing equipment comprises a fan and a ventilating duct, wherein the ventilating duct is provided with air inlets; an installation position is designed according to different lengths, spans and roof slopes of the cowhouse; the fan is fixed to the designed installation position and is connected with the ventilating duct; the ventilating duct is hoisted to the top of the cowhouse through an air pipe connecting buckle, so that the ventilating duct and a fan opening of the fan are positioned in the same line. The concentration of fog and ammonia in the cowhouse can be automatically detected, and the start and stop of the ventilating equipment are controlled according to the upper limit and the lower limit of a set concentration value. According to the whole set of ventilating equipment system, the total intelligent automatic management is realized and manual operation is not required; meanwhile, the labor intensity of workers is greatly reduced and the working efficiency is improved.

The invention discloses a boiler slag removing device and a using method thereof. The device comprises a boiler body, a boiler cover arranged at the top of the boiler body, a slag cleaner, a metal detector, an infrared detector and a control chip; the slag cleaner comprises a laying disc, a motor, a rotating shaft and a scraping blade arranged on the rotating shaft, the rotating shaft includes a hollow copper tube, and the bottom of the rotating shaft is provided with a spray hole. The boiler slag removing device is simple in structure, additional infrared and metal detectors can be used to detect the residual components and thickness of slag, the residual components and thickness are sent to the control chip, the control chip analyzes and processes the information to control the motor, the motor controls rotation of the rotating shaft, the scraping blade removes the slag by scraping, dilute hydrochloric acid is input to the copper rotating shaft to further wash the slag, dry and wet manners are combined, the occupation area is small, faults are fewer, and the device is suitable for different types of boilers.

The invention provides a water surface floating object collecting device, and relates to the technical field of water body treatment. The water surface floating object collecting device is mainly usedfor solving the technical problem that in the prior art, the collection of water surface floating objects is inconvenient. The water surface floating object collecting device comprises a drainage mechanism and a collecting barrel. The upper end of the collecting barrel is located above the liquid level, and a filtering screen is arranged at the lower end of the collecting barrel. The drainage mechanism is located below the liquid level, and when the drainage mechanism is started, the liquid which is located in the collecting barrel can be downwards drained. The drainage mechanism and the collecting barrel are connected with each other through a movement mechanism. When the drainage mechanism is started and downwards drains water, the drainage mechanism can upwards move due to the counteracting force, the movement mechanism works under the action of the drainage mechanism and pulls the collecting barrel to downwards move to the space located below the water surface at this moment, andthe water surface floating objects can flow into the collecting barrel along with the water flow at this moment. The water surface floating object collecting device is used for water body environmenttreatment and can conveniently achieve the collection of water surface floating type garbage.

The invention relates to a multifunctional baby carriage system, which comprises a baby carriage. The baby carriage is provided with a weighing sensor, the weighing sensor is connected with an MCU, and the MCU is also connected with a buzzer. The system also comprises an intelligent mobile phone; the intelligent mobile phone is internally provided with a first Bluetooth module; and the MCU is also connected with a ranging module and a second Bluetooth module for being connected with the first Bluetooth module. Bluetooth wireless communication is realized through the first Bluetooth module and the second Bluetooth module in the intelligent mobile phone, a condition of whether the baby is taken away is judged through a weight signal detected by the small weighing sensor, and the buzzer is automatically controlled to give an alarm automatically. In addition, control on music on and off and volume adjustment is sent to the MCU through the intelligent mobile phone, and control on motor forward, backward, steering, quickening, stopping and synchronization is sent to a motor driving module. Thus, the baby carriage use safety is improved, and intelligent control on the baby carriage by the intelligent mobile phone is enriched.

The invention discloses an ultrasonic cleaner which comprises an ultrasonic cleaner body. The ultrasonic cleaner further comprises a cover which is made of viscoelasticity adiabatic damping materials. The cover is matched with the ultrasonic cleaner body. The ultrasonic cleaner body is provided with a timing device. The ultrasonic cleaner has the advantages that due to the fact that the cover is made of the viscoelasticity adiabatic damping materials, noise generated by the ultrasonic cleaner in the work process can be reduced well; in addition, the ultrasonic cleaner is provided with the timing device, stopping of the ultrasonic cleaner can be controlled accurately, and convenience is achieved.

The invention belongs to the technical field of sickbeds, and in particular relates to a self-locking sickbed for medical treatment based on direction-changing transmission. The self-locking sickbed for medical treatment based on direction-changing transmission comprises a trigger mechanism, a sickbed body and a self-locking mechanism. When people use the sickbed designed according to the technical scheme, no matter the user forwards pulls, backwards pulls or slantwise pulls or pulls trigger drive rods, the movement of the drive rods enables a fourth rotation shaft to rotate; the fourth rotation shaft rotates to enable corresponding arc-shaped friction plates to lose constraint for a limiting cylinder and a rotation shaft, namely, the rotation shaft and a second transmission shaft can rotate freely, a rolling wheel can freely rotate, and the sickbed can be normally used. When the user wants the sickbed to be stopped, at the time, the driving for the trigger drive rods is stopped, the rotation shaft and the second transmission shaft lose the function of rotation, the rolling wheel loses the function of rotation, and at the time, the sickbed is in the static state.

The invention belongs to the technical field of application of household portable water pump circulation accessories and particularly discloses a drinking water level garden pump with a tank. The drinking water level garden pump with the tank comprises the pressure tank, a motor pump arranged on the pressure tank, and a capacitance component matched with the motor pump in use. The drinking water level garden pump with the tank has the beneficial effects that the designed structure is reasonable, the service life is long, the noise is low, the temperature rise is low, the flow is large, the lift is high, moreover, an electronic pressure switch is used to accurately control to start and stop the pump, and the range of application is wide.

The invention discloses machining equipment with positioning structures. The machining equipment with the positioning structures comprises a conveying mechanism used for conveying a first workpiece, multiple machining working stations are arranged in the conveying direction of the conveying mechanism, the positioning structures are arranged on at least one machining working station, and each positioning structure comprises a keep-off manipulator arranged in the advancing direction of the conveying mechanism. The keep-off manipulators are arranged in the advancing direction of the workpiece and can suspend the workpiece on the corresponding working stations to be machined, the workpiece can be accurately controlled to be suspended at the corresponding working stations and leave without stopping conveying, the accuracy of the machining position can be further ensured by being matched with a limiting structure, and machining precision and efficiency are improved.

The invention relates to a system for grabbing a part from a material frame under visual guidance of a robot and a control method. The system comprises the robot, a processor and a grabber assembly. The grabber assembly comprises a main beam, and a part position sensing module and a clamping module which are arranged on the main beam. The part position sensing module comprises a part photoelectricsensor, a dual-channel photoelectric sensor and a 2D camera. The control method includes the steps that the part position sensing module confirms whether there is a part in the material frame or not,obtains the position information of the part and the material frame and obtains the part grabbing position and the returning position according to the position information, and the grabber assembly moves to the part grabbing position to grab the part and then moves to the returning position to move up so as to complete the grabbing of the part. Compared with the prior art, the horizontal positioninformation of the part and the material frame is obtained through the single 2D camera, the robot is guided to move on the basis of the horizontal position information obtained by the 2D camera, thepart is clamped through a telescopic suction cup and a claw, the device cost is low, maintenance is convenience, and the grabbing accuracy and stability are high.

The invention relates to a Yunnan-featured steam pot chicken cooking device and belongs to the technical field of food processing. The Yunnan-featured steam pot chicken cooking device aims at overcoming the deficiency that existing steam pot chicken cooking devices are complicated in process and operation, fail to meet the requirements on taking of multiple persons and cannot regulate steam quantity as required or automatically control temperature and liquid level. According to the Yunnan-featured steam pot chicken cooking device, steam carries the essence of seasonings into a steam cooker so that the steam cooker can obtain the essence of the seasonings without adding in the seasonings, further seasoning picking can be saved and meanwhile delicious flavor of steam pot chicken can be ensured; a baffle is arranged inside a steam pipe to adjust the steam amount inside the steam pipe according to specific needs and further to adjust chicken steaming speed as required; a temperature monitor can control that water inside a cooker body is at a boiling temperature all the time and automatically cut off power when the temperature is over high to save electricity; a liquid level signal automatic collection controller can control the water level inside the cooker body to be at an appropriate height to avoid danger caused by over-high or over-low water level.

The invention relates to the field of capsule processing, and particularly discloses an anti-blocking device in the filling process of bottled capsules. The anti-blocking device comprises a shell, a vertical plate is fixedly connected to the side edge of the shell, a feeding groove is formed in the bottom of the vertical plate, a first conveying belt is rotationally connected to the position, located at the bottom of the feeding groove, of the shell, a plurality of clamping grooves are formed in the first conveying belt, medicine bottles are clamped in the clamping grooves, a support is fixedly connected to a top wall plate of the shell, the support is fixedly connected with a scattering assembly arranged above the center of the shell, and the transmission tail end of the scattering assembly is connected with a filling box. According to the anti-blocking device, blockage in the filling process can be effectively avoided, the capsule filling efficiency is reduced, the guide adjusting process in the capsule filling process is effectively simplified, and the filled capsules can be accurately counted.

The invention provides an automated guided vehicle control system which comprises a control module and a vehicle-borne module. The control module comprises a switch unit for transmitting a start signal or a stop signal, a micro processing unit for encoding the start signal or the stop signal, and a command transmitting unit for sending the encoded start signal or the encoded stop signal. The vehicle-borne module comprises a signal receiving unit for receiving the signal sent by the command transmitting unit, a micro processing unit for decoding the signal received by the signal receiving unit, and a signal transmitting unit for sending a corresponding start or stop control signal to an automated guided vehicle according to the decoded signal. The invention also provides an automated guided vehicle control method. The above automated guided vehicle control system can control the stop or start of the automated guided vehicle, thus the stop of the automated guided vehicle at all stops is not needed, and the efficiency of logistics is improved.

The invention relates to the field of building wall structures, in particular to a double-layer curtain wall unit and a double-layer curtain wall. The double-layer curtain wall unit comprises a first mounting frame and a second mounting frame, the first mounting frame and the second mounting frame are arranged side by side in a staggered mode, and an air inlet is formed in the first mounting frame; and a flow guide assembly used for guiding airflow to flow towards the second mounting frame is arranged in the first mounting frame, an exhaust port is formed in the second mounting frame, and an exhaust assembly used for guiding air to be exhausted is arranged in the second mounting frame. The double-layer curtain wall unit and the double-layer curtain wall has the effect of improving the ventilation efficiency of a building.

The invention provides an automatic walking medical bed system, belonging to the field of medical instruments, comprising a bed body, a power mechanism, a control device, a controller and a program stored in the automatic walking medical bed system. The power mechanism and the control device are arranged on the bed body. The control device is electrically connected with the power mechanism; the control device is provided with a first wireless communication device. The controller is provided with a second wireless communication device. The first wireless communication device is electrically connected with the second wireless communication device. The program performs the following steps: obtaining the control information of the user through the controller; determining a control instructionthat matches the acquired control information; The power mechanism is controlled to execute the corresponding operation action by the control command. The invention can conveniently control the movement of the bed body, stop, turn and realize the automatic walking of the bed body through the controller, thereby avoiding the trouble that at least two nurses are required to push the bed body in theprior art, assisting the nurses in working and saving the manpower of the hospital.

The invention provides a clothes dryer control method and a clothes dryer, relates to the field of electrical equipment. The purpose of improving the clothes drying effect of the clothes dryer is achieved. The clothes dryer control method comprises the steps that the drainage duration when drainage water of a clothes drying cylinder of the clothes dryer reaches the set water amount is obtained; the load capacity of the clothes drying cylinder is determined based on the drainage duration; the target humidity of the clothes drying cylinder is determined based on the load capacity; and the clothes dryer is controlled to run and stop based on the target humidity and the actual humidity of the clothes drying cylinder. The clothes dryer control method is mainly used for drying clothes.

The invention discloses a tool for gas blower barring. The tool comprises a manpower driving device (100) and a location device (200), wherein in the manpower driving device (100), a shifting disc (120) is provided with a pawl (123); the pawl (123) and an inner ratchet (110) form a ratchet and pawl mechanism; the shifting disc (120) is provided with a first location hole (121); two pressure plates (130) are provided with second location holes (131) communicating with the first location hole (121); the shifting disc (120) is fixedly clamped between the two pressure plates (130); an operating handle (140) is fixedly connected with an outer side wheel flange of the inner ratchet (110); in the location device (200), a sleeve (210) is provided with a sleeve cavity (211), and is fixed at one end of a connecting rod (220); and a turn-knob part (230) is fixed at the connecting rod (220), and is used to be in location fit with the first location hole (121) and the second location holes (131) in the circumferential directions of the first location hole (121) and the second location holes (131). With the adoption of the scheme above, the problem that alignment work is relatively difficult when an electric barring device is adopted to carry out rotor rotation can be solved.

The invention relates to the technical field of order picking devices, and discloses a logistics supply chain order picking device based on the automatic identification technology. The logistics supply chain order picking device comprises a substrate. A first supporting frame is fixedly mounted at the top of the substrate. A second supporting frame is fixedly mounted at the position, located on the right side of the first supporting frame, of the top of the substrate. A third supporting frame is fixedly mounted at the position, located on the right side of the second supporting frame, of the top of the substrate. A conveying belt is movably mounted in the first supporting frame. A barcode recognizer is fixedly mounted at the position, located above the conveying belt, of the top of the first supporting frame. According to the logistics supply chain order picking device based on the automatic identification technology, through the action of a transmission gear and a gear rack, a mounting rack is driven to ascend and descend, the height of objects is consistent with the height of a first conveyer belt or a second conveyer belt or a third conveyer belt, a second servo motor is startedto drive the objects to be sorted, and the effect of simply and efficiently sorting the objects is achieved.

The invention provides an electric control optical zoom system which comprises a lens guide cylinder, two sliding lenses arranged in the lens guide cylinder, a lens cam cylinder sleeving the outer side of the lens guide cylinder, a driven gear sleeving the outer side wall of the upper end of the lens cam cylinder, and an annular magnetic grid sleeving the outer side of the upper end of the lens cam cylinder. The magnetic induction sensor is arranged on the upper side of the annular magnetic grid, the direct-current gear motor is arranged on one side of the lens cam cylinder, the control circuit board is connected with the magnetic induction sensor and the direct-current gear motor, the direct-current gear motor drives the driving gear, the driven gear and the lens cam cylinder to rotate, and zooming of the lens is achieved. The rotation angle of the lens is positioned through the magnetic grid and the magnetic induction sensor which are annularly arranged, errors of a transmission system are eliminated, meanwhile, the precision of the magnetic grid and the magnetic induction sensor is extremely high, and the zoom precision of the lens can be effectively improved.