46results about How to "Quick stop" patented technology

The invention provides a high-low voltage power distribution cabinet capable of improving safety performance, which comprises a cabinet body, a gas storage tank, a communicating pipe, a trigger mechanism and a spray head, a plurality of support beams for installing different elements are arranged in the cabinet body, the gas storage tank is arranged on the cabinet body and is used for blowing and cooling the elements in the cabinet body, the communicating pipe is positioned in the cabinet body, and the trigger mechanism is used for triggering the spray head. One end of the gas storage tank penetrates out of the cabinet body and is communicated with a gas outlet of the gas storage tank, gas flow of the gas storage tank is accurately blown to each position in the cabinet body through the communicating pipe, the multiple nozzles are arranged and installed on the communicating pipe, the nozzles dispersedly spray gas flowing out of the communicating pipe, and the trigger mechanism is installed between the communicating pipe and the nozzles. And when the temperature or the element in the cabinet body is abnormal, the air storage tank and the nozzle are communicated through the communicating pipe. According to the high-low voltage power distribution cabinet capable of improving the safety performance, through the design of the integrated air storage tank and the communicating pipe, precise blowing cooling of elements in the cabinet body is achieved, and the heat dissipation efficiency is improved.

The invention relates to the technical field of molten iron transfer, and discloses high-stability molten iron transfer equipment which comprises a tractor, wheels are rotatably connected to the lower portion of the tractor, a molten iron tank is fixedly connected to the upper surface of the tractor, and a linear motor is fixedly connected to the upper surface of the tractor. According to the hot-metal ladle conveying device, after the sealing half covers on the two sides of the hot-metal ladle are attached to each other, the hot-metal ladle can be sealed, molten iron is prevented from splashing in the conveying process, the sliding base and the sealing half covers ascend and descend, the sealing half covers are adjusted to the proper positions according to the height of the hot-metal ladle, and therefore the hot-metal ladle can be conveniently conveyed. The semi-circular head plug pin is fixed in the positioning cylinder, so that the semi-circular head plug pin can be better fixed, the sealing stability is improved, the fixing block and the positioning cylinder are thoroughly separated, the semi-circular head plug pin can be quickly opened, and molten iron can be loaded and unloaded.

The utility model discloses a kind of braking limiting devices for transport web belt, the utility model relates to conveying web belt technical field.It includes support frame, the support frame is provided with the conveying mechanism for transporting web belt equipment, conveying mechanism includes: brake assembly, including the support shell of support frame upper end fixation, the inside of the support shell is penetrated and is rotatably connected with support shaft, one end of the support shaft is fixed with positioning tooth, the utility model positioning tooth rotates synchronously with support shaft, positioning block is tightly attached positioning tooth surface under the action of spring, when needing emergency stop, motor is de-energized, support shaft deceleration, positioning block is clamped into tooth groove due to spring thrust, self-locking is formed by the rotary connection of connecting shaft, prevent support shaft from continuing to rotate, the clamping structure of positioning block and positioning tooth, can effectively prevent support shaft from rotating, make transport web belt main body stop running quickly, prevent transport web belt from continuing to move due to inertia, reduce the risk of goods collision damage and slip.

The utility model discloses an unmanned plane landing anti -thrust device belongs to unmanned plane technical field, the device is in the abdomen of large fixed wing unmanned plane, including anti -thrust board and two groups of drive adjusting mechanism, the anti -thrust board is paddle formula arc structure, and the bottom surface is equipped with longitudinal fairing and is made with carbon fiber composite material, and the angle on the board is equipped with pressure sensor, drive adjusting mechanism contains support, connection hanging cylinder, drive assembly, axle seat, connecting seat and connecting rod assembly, can drive anti -thrust board and realize 0 degree 90 degree angle adjustment, and sensor feedback signal reaches controller, and controller receives unmanned plane flight system landing information and controls motor, forms closed loop control. The device utilizes the airflow to generate the reverse thrust and shortens the brake distance, and the anti -thrust board is horizontal when not working and does not influence the flight, and is light in weight, and the adjustment is accurate, and is convenient to maintain, is applicable to the safe landing of large fixed wing unmanned plane.

The utility model discloses a progressive type safety clamp which comprises a driving clamp body and a driven clamp body, the middle of the inner side of the driving clamp body and the middle of the inner side of the driven clamp body are each fixedly connected with two guide blocks, each guide block is connected with a locking clamping block in a sliding mode, the bottom end of each locking clamping block is fixedly connected with a linkage frame, the bottom end of each linkage frame is fixedly connected with a linkage rod, and the linkage rods are fixedly connected with the linkage rods. U-shaped springs are fixedly connected to the interiors of the driving plier body and the driven plier body, a transmission assembly is arranged between one end of the driving plier body and one end of the driven plier body, and the transmission assembly is used for being matched with the locking clamping block to form emergency stop of an elevator. Through the structural cooperation of the transmission assembly, the driving square shaft and the driven square shaft can be turned over at the same time, the multiple locking clamping blocks are made to get close to the elevator track at the same time, an elevator can stop rapidly, meanwhile, stress of the elevator track is more stable, and deformation of the elevator track due to the fact that stress on one side is too large is avoided.

The present invention discloses a wheelchair motor, including a motor shaft, a first end cover, a second end cover, a wheel hub, a stator group, a magnetic steel and a brake unit, wherein the brake unit includes a connecting seat, a moving plate, a stator, a friction plate, a resistance spring, a magnetic brake seat, a temperature sensor for monitoring the internal temperature of the motor and a Hall element for monitoring the distance between the moving plate and the magnetic brake seat and the rotation speed of the friction plate during braking. A polygonal boss ring is provided at one end of the connecting seat; the friction plate is plugged into the polygonal boss ring and is located between the moving and stator plates, and the stator is connected to one axial end of the magnetic brake seat with an axial interval L. The temperature sensor and the Hall element are respectively arranged on the silicon steel sheet turns of the stator group and on the magnetic brake seat. The advantages are: large braking force and good braking response, and the internal state of the motor is monitored to make it in good operating state and increase its service life. The placement of the sensor element is cleverly designed to ensure the accuracy of the collected signal without affecting the overall structure; the structure of the whole vehicle is optimized and beautiful.

The utility model provides a motor brake device of a dust collector, the dust collector and a controller, and relates to the technical field of dust collectors, the motor brake device comprises a motor, a bridge arm structure, a power supply battery and the controller; the bridge arm structure comprises a first switching device and a second switching device; the first switching device is electrically connected with the second switching device; the power supply battery is electrically connected with the motor through the bridge arm structure, the controller is electrically connected with the bridge arm structure, and the controller is used for controlling the second switching device to be in an on-off state and controlling the first switching device to be in an off state when the motor brakes, and current output by the motor flows back to the power supply battery when the second switching device is in the on-off state; the on-off state is the state that switching is conducted between the on state and the off state based on pulse width modulation in a unit period, the motor of the dust collector is controlled to conduct braking based on the structural design of the motor braking device and an active braking adjusting mode based on pulse width modulation, and rapid and effective motor braking is achieved.

The invention discloses a flow calculation-based doctor seeing index calculation method for a patient outpatient doctor seeing decision model. The method comprises the following steps: step 1, constructing a patient outpatient doctor-seeing decision model based on flow calculation; step 2, the Kafka distributed message distribution system obtains the existing doctor seeing information of the outpatient from the hospital information system, and stores the model and parameters required by the model; and step 3, when a new patient sees a doctor in an outpatient service, acquiring parameters related to the new patient and required by the model, and calculating the longest waiting time and the longest tolerable queue which can be tolerated by the outpatient patient in real time through a Spark Streami ng flow calculation framework flow according to the model and parameter information stored in the Kafka distributed message distribution system. According to the method, the service value model of patient outpatient diagnosis is established, the longest waiting time and the longest tolerance queue which can be tolerated by the patient can be calculated in real time, timely data support is provided for hospital outpatient departments, resource allocation optimization is facilitated, and patient satisfaction is improved.

The invention discloses an electromagnetic braking and overspeed protection integrated lift car and lift, and relates to the technical field of mine hoistway lifts.The electromagnetic braking and overspeed protection integrated lift car comprises a car body arranged in the middle of two first rails and further comprises electromagnetic braking assemblies used for braking the car body, and the electromagnetic braking assemblies are arranged on the two sides of the car body; the electromagnetic braking assembly comprises first shells fixedly connected to the outer walls of the two sides of the compartment body, the outer walls of the two sides of the first shells are fixedly connected with expansion shells, and the expansion shells communicate with the first shells. The stopping capacity of the compartment body is improved, the elevator can stably stop at a higher speed during descending or ascending, and therefore the purpose of efficiently conveying materials and the like during mine operation is achieved.

The utility model discloses a high-precision metal film box cutter with a limiting structure, which comprises a cutting table and a cutting mechanism, the cutting mechanism is arranged on the cutting table, a mounting frame is fixedly mounted on the upper surface of the cutting table, a limiting component is arranged in the mounting frame, and a speed reducing component is arranged on a protective cover of the cutting mechanism. The diaphragm capsule cutting device has the advantages that the diaphragm capsule is clamped and limited in the mounting frame through the limiting assembly, the diaphragm capsule can be clamped and limited conveniently, displacement is avoided when the diaphragm capsule is cut through a blade of the cutting mechanism, and in addition, after the diaphragm capsule is cut by the blade, in order to enable a worker to rapidly stop working, the cutting efficiency is improved. Therefore, a worker operates the speed reduction assembly, the speed reduction assembly decelerates the rotating blade to accelerate stopping of the blade, and therefore the advantage that the worker can rapidly stop work is achieved.

The invention discloses a remote control parking and carrying platform, comprising an upper platform for fixed connection with a vehicle chassis; a lower platform; a lifting assembly, comprising a lifting power device and a first lifting link group, the first lifting link group comprising two first links, two second links and a first cross bar, one end of the two first links is hinged to each other, and the other end is respectively hinged to the upper platform and the lower platform, one end of the two second links is hinged to each other, and the other end is respectively hinged to the upper platform and the lower platform, one end of the first cross bar is connected to the first link, and the other end is connected to the second link, and the lifting power device is connected to the first cross bar; a pulley group is provided with at least one group, including two pulleys, which are rotatably connected to the lower platform; a driving motor is connected to both pulleys in transmission; a remote controller is provided with a remote control switch, and the remote control switch comprises a driving switch for controlling the forward or reverse rotation of the driving motor and a lifting switch for controlling the opening and closing of the lifting power device. It is convenient for people to park outside the vehicle.

The present application provides a kind of cart, comprising: rack;Hub assembly is installed on rack by rotating shaft, hub assembly includes wheel hub motor and brake disc fixedly connected with wheel hub motor;Brake assembly is installed on rack, including first driving part and brake pad, first driving part is fixedly connected with rack, and brake pad is connected with first driving part;Operating assembly is installed on rack, including second driving part and brake handle, second driving part is connected with first driving part by hydraulic oil pipe, brake handle is installed on second driving part, when braking, hydraulic oil in second driving part is extruded to first driving part along hydraulic oil pipe by brake handle, pushes brake pad, so that brake pad contacts and extrudes brake disc.The present application simultaneously controls two brake assemblies by one operating assembly, to facilitate operation, and two wheels are simultaneously braked to realize rapid stop, and can avoid side slip phenomenon when braking, so that the cart running process is safer.

A vehicle manufacturing system according to an embodiment of the present invention is provided with: a camera that captures an image of a traveling area in which a plurality of vehicles travel and the surroundings thereof; a worker detection unit that detects a worker on the basis of an image captured by the camera; a region determination unit that determines whether the worker is in a detection region corresponding to the travel region or a non-detection region located on both left and right sides of the travel region; a posture detection unit that detects the posture of the worker in the detection area by performing image processing on the image captured by the camera; and a stop control unit that stops the vehicle on the basis of the posture of the operator.

The invention discloses a heavy anti-collision early warning vehicle which comprises an elastic energy absorption anti-collision panel, a compartment type energy absorption box, a friction energy dissipation bottom plate, a mode conversion driving assembly and an early warning mechanism. The elastic energy absorption anti-collision panel is assembled at the front end of the compartment type energy absorption box, and the compartment type energy absorption box comprises liquid compartments and cavity compartments which are arranged in a staggered mode. The friction energy dissipation bottom plate is fixed to the bottom of the compartment type energy absorption box. The mode conversion driving assembly is assembled in a fixing cavity formed in the bottom of the compartment type energy absorption box and can be used for supporting in the anti-collision working state and lifting the compartment type energy absorption box to be hauled in the hauled state. The early warning mechanism is assembled at the top of the compartment type energy absorption box; through the combined design of the elastic energy absorption anti-collision panel, the compartment type energy absorption box and the friction energy dissipation bottom plate, multi-stage collision buffering is achieved, and vehicle intrusions of different speeds and weights can be coped with; the early warning mechanism is arranged, so that an early warning signal can be sent out in time to remind a driver to pay attention, and the accident risk is further reduced.

The present disclosure provides a remote-driven new energy loader anti-slope control method and system, which relates to the field of electric vehicle automation control technology, including: obtaining the total weight of the vehicle by monitoring the vehicle's inclination angle, boom angle and hydraulic system pressure; using an inclination sensor to measure the slope in real time, and combining the total weight of the vehicle to determine the driving force of the motor as a feedforward control parameter. Determine whether to implement anti-slope control based on the state of the brake pedal and the accelerator pedal. When in the anti-slope control stage, first use the feedforward control parameter to perform automatic parking control on the slope. On this basis, feedback adjustment is performed in combination with the actual vehicle speed, and reliable anti-slope control of the remote-controlled loader on the slope is achieved through dual control. The method proposed by the present invention can effectively shorten the slope distance of the remote-driven loader on the slope and improve the safety of the vehicle during use.

The utility model discloses a tea strainer, which comprises a funnel part, a tea strainer part and a tea strainer part, the barrel body part is a cylinder with an opening in the upper part, and the barrel body part is connected to the top end of the funnel part; a steam opening is formed in the middle of the cylinder body part and is communicated with the funnel part; a plurality of water filtering holes are formed in the side wall of the barrel body part. When the tea strainer is used, due to the fact that tea leaves are cooked through water vapor, tea soup and the tea leaves are kept in a separated state, the cooking degree of the tea leaves can be conveniently judged by observing the color of the tea soup, after the tea soup is cooked, generation of the steam can be rapidly stopped in a heating stopping mode, and the tea strainer is convenient to use. The tea leaves can be effectively prevented from being excessively boiled, so that the original flavor and nutritional ingredients of the tea leaves are reserved to the greatest extent.

The invention discloses an intelligent parking management system and method based on non-inductive payment, and the system comprises a parking information acquisition module, a parking place selection module, a parking element analysis module and a comprehensive analysis module, relates to the technical field of intelligent parking management, and solves the problems that the quick positioning of an idle parking space cannot be realized, and the parking efficiency is improved. In order to solve the technical problems in the prior art that time is wasted due to the fact that a user spends much time to find a parking space, the parking space of a parking lot is identified by identifying a vehicle of the user, judging the state of the vehicle, screening the nearest parking space according to the position of the vehicle, and analyzing the parking space by integrating the information of the parking space, so that the user can find the parking space in the parking lot. According to the method, whether the current selected parking space can be parked or not is judged, secondary analysis is carried out if the current selected parking space cannot be parked, the optimal parking space is selected, and finally, the selected parking space information is displayed to the user, so that the user can park quickly and conveniently, and the parking time is saved.

The winch comprises a supporting plate, rubber mats, a winch device, a power distribution control box and a gearbox, the two rubber mats are connected to the two sides of the supporting plate through glue respectively, the winch device is welded to the rear portion of the top of the supporting plate, and the power distribution control box is welded to the right side of the front end of the top of the supporting plate. According to the winch, the structure of an existing winch is improved, so that the winch has a stalling sudden stop function, it is guaranteed that the winding wheel can be rapidly stopped when stalling occurs in an unexpected situation, and safety of workers and the environment is guaranteed.

The present application discloses a campus intelligent monitoring method and system, the method comprising: receiving wristband warning information; determining the area ID to which it belongs according to the wristband coordinate points in a preset virtual campus map as the target area ID; determining all cameras corresponding to the target area ID, and intercepting according to the positioning timestamp to obtain a set of image frame sequences to be analyzed; based on a pre-trained campus behavior analysis model, analyzing the set of image frame sequences to be analyzed to obtain a behavior analysis result, and if the behavior analysis result is a conflicting label, performing a stop prompt processing based on the wristband coordinate points, and if the behavior analysis result is a non-conflicting label, performing no processing. The present application uses wristband coordinate points to determine the location of students, uses the campus behavior analysis model to perform analysis to obtain the behavior analysis result, and performs a stop prompt processing for the situation where a conflicting label appears, thereby improving the accuracy and efficiency of monitoring and analyzing campus violence incidents.

The invention relates to the technical field of hub motor detection, and particularly discloses a new energy automobile hub motor test board which comprises a test board body, a lifting mechanism used for storing a hub motor is arranged on the test board body, and the lifting mechanism has the function of adjusting the height of the hub motor; the lifting mechanism comprises a supporting plate, the supporting plate is connected with a support, and the support is connected with a height adjusting mechanism used for adjusting the height of the support. The hub motor is connected with the test shaft through a coupler, and one end, far away from the test shaft, of the hub motor is connected with the right support. The hub motor is connected with the test shaft through the coupling, the test shaft is connected with the plurality of aligned mounting seats, and the plurality of mounting seats jointly limit the test shaft and the hub motor, so that the rotating center lines of the test shaft and the hub motor coincide, the hub motor can rotate, and the actual use condition of the hub motor is simulated; therefore, the rotation of the connected test shaft is more practical, and the measured vibration amplitude of the test shaft is more accurate.

This invention provides a vacuum cleaner floor brush, relating to the field of cleaning equipment technology, comprising: a housing with an internal mounting cavity; a first supporting member detachably connected to the housing and forming a first end; a second supporting member fixedly connected to the housing and forming a second end; and a roller brush with a hollow interior, wherein the first and second supporting members are respectively placed at both ends inside the roller brush, and the first supporting member is fixedly connected to the roller brush; guide gaps are formed between the two end walls of the roller brush and the first and second ends, respectively; and a receiving groove is formed between the inner wall of the roller brush and the outer walls of the first and second supporting members, and the receiving groove communicates with the guide gaps. This invention guides the hair accumulated at both ends of the roller brush into the receiving groove, preventing the hair from rubbing against the housing and causing the housing to deform and jam the roller brush, thus ensuring the stability of the roller brush rotation.

The utility model relates to mechanical press balance cylinder control technical field, especially a kind of mechanical press slider balance cylinder control system. Including: balance cylinder, pilot module, cartridge valve and energy storage module: the energy storage module is connected with the first port of cartridge valve;The second port of pilot module is connected with cartridge valve;The third port of balance cylinder is connected with cartridge valve;The balance cylinder is connected with mechanical press slider;The pilot module is used to control the internal pressure of balance cylinder, to avoid balance cylinder overpressure;The energy storage module is used to control the movement state of balance cylinder.The utility model is through the pilot control oil of cartridge valve to use independent external control mode, compared with the closing time of existing common internal control mode to improve more than 80%, greatly improve the response speed and safety performance of equipment.

The invention belongs to the technical field of centrifugal fans, particularly relates to an EC centrifugal fan of a 24V permanent magnet brushless direct current motor, and provides the following scheme aiming at the problems that an existing traditional EC centrifugal fan is unreasonable in motor protection, difficult to maintain, insufficient in safety during equipment use and maintenance, lack of effective buffering and damping measures and the like. Comprising a fan shell, an air inlet is formed in one side of the fan shell, an air outlet is formed in the top of the fan shell, a wind wheel is rotationally arranged in the fan shell, and a connecting shaft is fixedly installed on one side of the wind wheel. The service life is prolonged, the performance is improved, and attractiveness and safety are achieved; the locking and electric control assembly is ingeniously designed, so that convenient maintenance and safe and rapid shutdown are realized, and the maintenance safety is guaranteed; and the buffer assembly reduces vibration and noise, and the durability and comfort of the equipment are enhanced.

The utility model relates to the technical field of recreation equipment, especially a kind of game motorcycle including base, motorcycle body and drive assembly, or including base, motorcycle body, drive assembly and limiting component, motorcycle body can make the action of tail swing by first driver, and when it approaches the central position, first driver and second driver exert push force or pull force, alternatively, two limiting drivers exert push force, to ensure that motorcycle body can be returned to position accurately after tail swing, and then improve the playing experience of user.

The utility model relates to the field of cantilever cranes, and particularly discloses an electric cantilever crane which comprises a cantilever, a swing seat mounted at one end of the cantilever, a rotating base arranged below the swing seat, rotating teeth mounted on the outer side of the lower end of the swing seat, and a second ratchet ring arranged below the rotating teeth. A first ratchet ring is mounted on the outer side of the swing seat between the second ratchet ring and the rotating teeth, a first brake mechanism is mounted on one side of the second ratchet ring and located in the rotating base, a second brake mechanism is mounted on one side of the first ratchet ring and located in the rotating base, and the first brake mechanism comprises a pawl, a winding roller and a brake motor. And an elastic rotating shaft is connected between the pawl and the rotating base. The tooth punching directions of the first ratchet ring and the second ratchet ring are opposite, the first ratchet ring and the second ratchet ring are matched with the action of the first brake mechanism and the second brake mechanism, so that no influence is generated during normal swinging, and when braking is needed, the purpose of quick braking can be achieved under the action of the overall brake and the pawl of the device.

The invention relates to a communication method in which a vehicle (1) exchanges information via a communication interface (2) with at least one entity (3) located within the communication range of the vehicle (1), the entity (3) transmitting a message (4) comprising a declaration to the vehicle (1). The communication method according to the invention is characterized in that the vehicle (1), upon receipt of the message (4), automatically checks the declaration as true or false, classifies the entity (3) as trusted if the declaration is true, and classifies the entity as untrusted if the declaration is false.

The invention discloses a portable detection device for air quality detection, and relates to the technical field of portable detection devices. The portable detection device for air quality detection comprises a portable air detector, the front surface of the portable air detector is fixedly connected with a ventilation detection port, and the front surface of the portable air detector is fixedly connected with a display screen. According to the portable detection device for air quality detection, the rotating shell is unfolded through extension of the telescopic rod, the rotating shell and the transparent plate are subjected to large wind resistance during falling, the portable air detector is deflected as a whole, and the bottom of the portable air detector is deflected towards the back and falls towards the ground; when the portable air detector falls to the ground, a second rubber roller is firstly in contact with the ground, and a second compression spring is compressed by impact force, so that the portable air detector is buffered and protected, and the influence on detection caused by damage of equipment is avoided.

The invention discloses an empty pumping prevention device which comprises a water tank, a water pump, a heater, a temperature sensor and a controller. A water outlet is formed in the bottom of the water tank; the temperature sensor is close to the water outlet; the controller is connected with the temperature sensor, the water pump and the heater and used for controlling the heater to heat; after the heater stops heating, the water pump is controlled to work, and water pumping action is executed; when the water pump works, the temperature data collected by the temperature sensor are continuously read, and the current temperature drop slope is calculated; then performing water-free judgment according to the numerical value of the current temperature drop slope; and when no water exists in the water tank, the water pump stops working. According to the empty pumping prevention device, no-water judgment can be achieved under the conditions that the product structure is not changed and sensors such as a flowmeter and a Hall sensor are not added, so that the water pump is controlled to stop working in time, and the problem that the user experience is poor due to empty pumping noise is solved.

The utility model provides a spring piece and a linear motor, the spring piece comprises a first spring part, a second spring part and a third spring part, the first spring part is connected with the second spring part through the third spring part, the first spring part and the second spring part are arranged in a staggered manner, and the third spring part is arranged as an inclined plate; the linear motor comprises spring pieces, a support, a machine shell and a mass block, the machine shell is fixed to the top wall of the support, the machine shell is hollow, and the two sides of the mass block are fixed to the machine shell through the spring pieces. Through the arrangement of the shape of the spring piece, the welding faces of the first spring part and the second spring part are located in different planes, direct welding is facilitated, the width of the tail of the spring piece is equal to the sum of the inclined projection distance of the third spring part and 2 * the material thickness, space occupation caused by bending arcs can be eliminated, the occupied size of the spring piece is effectively reduced, and the service life of the spring piece is prolonged. The possibility is provided for further reducing the size and the size of the linear motor, and the possibility is provided for improving the performance of the linear motor under the condition that the original size is not changed.

The utility model provides a positioner special for three-axis grinding, which belongs to the technical field of material grinding and comprises a base, a positioning mechanism, a positioning mechanism and a positioning mechanism. The transmission wheel is rotationally arranged on the upper surface of the base, a rotating disc is fixedly arranged on the transmission wheel, and the rotating disc indirectly provides support for the cross beam; the driving gear is rotationally arranged on the base, and a gear ring corresponding to the driving gear is further arranged on the outer surface of the transmission wheel; the limiting groove is annularly formed in the bottom face of the rotating disc and located on the same axis with the rotating disc, and the inner diameter of the limiting groove is larger than the outer diameter of the gear ring; the dustproof cover is of a hollow tubular structure and is fixed to the upper surface of the base, and the top of the dustproof cover is located in the limiting groove; the dustproof box extends from the side wall of the dustproof cover, is of a box structure, is fixed to the upper surface of the base and is located outside the driving gear; the driving wheel and the rotating structure on the base can be protected through the dustproof cover and the dustproof box, so that the service life of the positioner is effectively prolonged, and the maintenance frequency of the positioner is reduced.