2239 results about "Stepper motor" patented technology

The invention discloses a target tracking method fusing visual perception and motion control. The method comprises the following steps: improving a YOLOv8 model and pre-training the improved YOLOv8 model; s2, preprocessing an image acquired by a camera, inputting the preprocessed image into the YOLOv8 model trained in the step S1, and outputting a target bounding box and a target center pixel coordinate; target center pixel coordinates are transmitted to a development board of a pre-burning algorithm program through a serial port, the development board is designed according to a stepping motor mathematical model, sine acceleration and deceleration serve as the basis, PID control, sliding mode control and fuzzy control algorithms are fused, and code burning is generated after in-loop simulation optimization; and the development board drives a stepping motor to adjust the posture of the holder according to the target center pixel coordinate control instruction, so that the target stops moving after being kept in the view center. The problems that a traditional YOLOv8 model is large in target recognition error under the complex background, PID control is prone to oscillation under the nonlinear working condition, buffeting exists in sliding mode control, and response lags when fuzzy control is independently used are solved.

According to the step motor sensorless control method based on improved robust Kalman filtering, an HBM current state equation is established, and an extended Kalman state equation is established; establishing an inductance deviation model, and deducing a system covariance matrix with errors; parameter uncertainty robust control is introduced, an expansion factor is designed, and a system covariance matrix is reconstructed for limitation compensation; the method comprises the following steps: constructing chi-square test statistics through an innovation sequence, identifying a system gross error, designing a robust weight function based on a system residual vector, selecting whether to carry out variance correction or not according to an identification result, inhibiting the cumulative influence of a model mismatch error on state estimation, updating a state, and adjusting robust intensity. According to the method, parameter uncertainty robust control and an IREKF algorithm based on innovation detection are introduced to carry out dynamic compensation on a model mismatch error, REKF is improved through innovation detection, and the robust intensity is dynamically adjusted.

The invention discloses an auxiliary renal puncture device for the nephrology department, and belongs to the technical field of renal puncture, the auxiliary renal puncture device comprises a sickbed, a plurality of supporting legs are fixedly arranged at the bottom of the sickbed, fixing plates are fixedly arranged on the two sides of the sickbed, and second sliding blocks are slidably connected to one sides of the two fixing plates; the breathing frequency and amplitude of a patient are captured in real time through an infrared breathing monitoring module, and displacement data generated by breathing of the kidney are accurately obtained in combination with motion sensing modules such as a lead screw encoder and a driving gear angle encoder. The intelligent control system drives the first stepping motor and the second stepping motor to adjust the position of the portal frame based on six-dimensional force sensor data of the force sensing module, meanwhile, the angle of the puncture needle is adjusted in real time through feedback of a mechanical arm joint encoder, and dynamic compensation of kidney respiratory movement is achieved. According to the mechanism, the puncture deviation caused by breathing can be controlled within the range of + / -0.5 mm, the puncture positioning precision is remarkably improved, and poor sample quality or operation risks caused by breathing movement are avoided.

The invention discloses high-efficiency motor iron core laminating equipment which comprises a base, a support fixedly mounted at the top of the base, a top plate fixedly mounted at the top of the support, an air cylinder mounted at the top of the top plate, a punch structure mounted on an output shaft of the air cylinder, and a stepping motor mounted in the center of the inner wall of the base. A rotating shaft is mounted on an output shaft of the stepping motor, and the rotating shaft and the base are rotationally mounted through a bearing; and the stamping disc is rotationally installed at the top of the base, a groove is formed in the bottom of the stamping disc, and the inner wall of the groove and the top of the rotating shaft are fixedly installed. According to the device, through three core technologies of electromagnetic-mechanical composite driving, a multi-stage buffer structure and precise rotation positioning, the positioning repetition precision, the controllable damping characteristic of the magnetorheological fluid damper and closed-loop control formed by a pressure sensing feedback system, the lamination quality consistency is remarkably improved, electromagnetic limiting and electromagnetic stripping of a motor iron core are facilitated, and the production efficiency is improved. The use effect is good and the efficiency is high.

The invention relates to the technical field of pressure control, in particular to a butterfly valve pressure self-adaptive adjusting method, device and equipment and a storage medium. According to the method, a pre-constructed neural network model is introduced, and user set pressure, actual measurement pressure, current control signals and error parameters serve as input variables; dynamic generation and real-time self-adaptive adjustment of PID control parameters are realized, the technical bottlenecks that parameter setting of a traditional PID controller is complex and adaptability to non-linear and time-varying systems is insufficient are effectively solved, and the parameter adjustment period is shortened; the weight parameter of the neural network is continuously optimized through a back propagation algorithm, so that the inhibition capability of the system on external disturbance is remarkably enhanced, the overshoot is reduced, and the long-term stability and control precision of pressure control are improved; the target step number is calculated in combination with butterfly valve hardware parameters, the accuracy and rapidity of stepping motor driving are ensured, and the problem of response delay of traditional PID control is effectively solved.

This application provides a cutting control method, apparatus, wire marking machine, and computer storage medium for a wire marking machine. The method includes: when the origin is located at the sensor's position, if a trigger command for a cutting action is detected, controlling a stepper motor to rotate, causing the stepper motor to drive a code disk to rotate in the target rotation direction via a transmission mechanism, and causing the stepper motor to drive a cutter via the transmission mechanism; when the sensor is detected entering the target code disk area where the cutting point corresponding to the cutting action is located, determining the number of steps to be taken based on the target rotation direction corresponding to the cutting action; controlling the stepper motor to rotate based on the number of steps to be taken, causing the cutting point corresponding to the cutting action to rotate to the sensor's position; and ending the cutting action when the cutting point corresponding to the cutting action has rotated to the sensor's position. The embodiments provided by this solution can improve the cutting accuracy of the wire marking machine, thereby improving the machine's operating efficiency.

The invention relates to a three-dimensional point cloud reconstruction method and device using a single-line laser radar and an inertial measurement unit (IMU). According to the method, a stepping motor drives a single-line laser radar to periodically pitch and swing, and the scanning dimension of the single-line laser radar is expanded to a three-dimensional space; the method comprises the following steps: synchronously acquiring point cloud data and IMU (Inertial Measurement Unit) data of a laser radar, performing intra-frame motion distortion compensation on each frame of point cloud data by using the IMU data, and eliminating distortion generated by carrier motion; projecting the compensated three-dimensional point cloud data to a two-dimensional aerial view (BEV) plane to generate a two-dimensional point set, optimizing and solving inter-frame two-dimensional rigid body transformation by adopting an iterative closest point (ICP) algorithm based on the BEV point set of adjacent frames, then lifting the inter-frame two-dimensional rigid body transformation into three-dimensional transformation, and updating the global three-dimensional pose of a carrier; according to the method, low-cost and high-precision three-dimensional point cloud reconstruction is realized, the hardware cost is reduced, the operation efficiency is improved, and the method is suitable for various devices such as a mobile robot, a sweeper and a simple scanner.

The invention relates to the technical field of motion control, in particular to a stepping motor monitoring control method and system, and the method comprises the following steps: obtaining a target and feedback signal rising edge sequence, analyzing a periodic change direction, judging a time migration trend, extracting a voltage and current response section, recognizing a disturbance time slice, and positioning high and low level boundaries. And screening signals with consistent frequency, extracting a running rhythm time sequence, and comparing a rhythm sequence to obtain a monitoring control behavior. According to the method, the time sequence of rising edges of a target and a feedback signal is compared, the displacement deviation trend is judged in combination with the periodic change direction, an interference section is identified by utilizing voltage abrupt change and current fluctuation characteristics, a control boundary is delimited according to the distribution of the interference section in high and low levels, and signal segments with consistent frequency characteristics are extracted to construct an operation rhythm. The driving behavior is extracted in combination with the signal time sequence and the rhythm sequence, the responsiveness to rhythm change is enhanced, and the problems of interference fluctuation and control rhythm disjunction caused by rhythm dislocation are relieved.

The invention discloses a cradle head dynamic control method and device, and the method comprises the steps: obtaining a two-dimensional pixel coordinate of a target object on a display plane, converting the two-dimensional pixel coordinate into a physical space coordinate through a coordinate conversion algorithm, and obtaining the pixel offset of the target object relative to the center of a cradle head; based on the pixel offset and the pixel density parameter, performing angle calculation by using a trigonometric function calculation module to obtain rotation angle parameters required by the horizontal axis and the vertical axis of the holder; pWM control signal conversion is carried out on the rotation angle parameter, a corresponding number of pulse waveforms are generated through a stepping motor driving module, and a holder double-shaft motor is controlled to rotate; and based on the deviation value between the current position of the holder and the target angle, real-time error correction is performed by adopting a PID control algorithm, so that the holder tracks the target object in real time and keeps pointing to the position of the target object. Through the solid geometry correction technology, the problems of precise positioning and dynamic tracking of a traditional pan-tilt control system in a complex scene are solved, and the precision and stability of pan-tilt control are improved.

The invention relates to the technical field of lithium ion battery nondestructive testing, and provides an ultrasonic phased array battery three-dimensional imaging method based on wave velocity correction. Firstly, phased array body wave full-matrix time domain data is utilized, and corresponding sound velocities of ultrasonic waves propagating in different directions in a battery are obtained. And then the corresponding sound velocity is used for a full-focusing method, phased array imaging of sound velocity correction is carried out, and a more accurate imaging result is obtained. And finally, the position of the phased array is moved through a mechanical arm and a stepping motor, and the collected ultrasonic B scanning image is reconstructed into a three-dimensional image. The result shows that the sound velocity correction is realized, so that compared with the traditional ultrasonic phased array imaging, the method can obtain a more accurate and specific battery defect imaging result, and the defect position is clearer under the same display threshold value. In addition, according to the method, wave velocity correction is applied to three-dimensional imaging of the battery, and a solution thought is provided for solving the problem that an economic, rapid and accurate imaging means is lacked in battery defect detection.

The invention belongs to the field of intelligent agricultural equipment research, and relates to a cherry tomato picking end effector and a using method thereof.The effector comprises a driving assembly and a finger assembly, the finger assembly is of a thin and long finger structure, and the probability of interference with plants in a narrow space is remarkably reduced; therefore, the adaptability and the picking success rate of the equipment in an unstructured environment are enhanced; the driving assembly adopts a dual-motor cooperative driving design, a lead screw motor is used for controlling opening and closing of fingers to grab fruits, a stepping motor drives the finger assembly to rotate to complete torsion separation of fruit stems, and the dual-channel driving mode with clear division of labor is beneficial to improving the synergism of picking actions and the overall operation efficiency. The automatic picking machine is suitable for automatic picking tasks of cherry tomatoes in various facility environments such as greenhouses or greenhouses.

The invention discloses a wet-type crushing pump with a self-cleaning function, and relates to the technical field of wet-type crushing pumps, the wet-type crushing pump comprises a main body mechanism, the main body mechanism comprises a base, a stepping motor is arranged above the base, the bottom surface of the stepping motor is in contact with the upper surface of the base, four limiting bolts are arranged above the stepping motor, and the bottom surface of the stepping motor is in contact with the upper surface of the base; the bottom end of each limiting bolt penetrates through the stepping motor and extends into the base, each limiting bolt is in threaded connection with the inner wall of the base, and a cleaning mechanism is arranged above the base; and the cleaning mechanism comprises a cleaning unit, the cleaning unit is located on the left side of the stepping motor, and the cleaning unit is used for cleaning the wet type crushing pump transmission structure. Impurities adhering to the impeller of the wet type crushing pump are automatically cleaned, and therefore the situation that normal work of the wet type crushing pump is affected due to the fact that crushed solid matter adheres to the impeller is prevented.

A method is proposed for determining a zero-force reference position of a wet-running brush actuator (2) for external excitation of a rotor of an electric motor (EM) arranged on a rotor shaft (RW). While an electric vehicle with an electric motor (EM) is stationary and the rotor is externally excited, a spindle (10) of the brush holder (2), which has an electric stepper motor (4) with an integrated spindle drive, is moved away from the grinding brushes (B1, B2) until the contact between the grinding brushes (B1, B2) and the associated slip rings (SR1, SR2) reaches a contact quality limit, the position assumed by the spindle (10) being defined as the zero-force reference position, from which the steps of the stepper motor (4) are counted in order to variably press the grinding brushes (B1, B2) against the slip ring (SR1, SR2) as required. In addition, a computer program, a computer program product, a system, and an electric vehicle are proposed.

The present disclosure relates to a stepper motor. The stepper motor according to embodiments of the present disclosure includes: a rotor assembly including a rotatory shaft and a plurality of magnetic steel units sequentially assembled along circumference of the rotatory shaft, inner walls of the plurality of magnetic steel units are in contact with an outer wall of the rotatory shaft, and the plurality of magnetic steel units are assembled to form a magnetic steel; at least one stator assembly sleeved on the rotor assembly; and two support assemblies each include a respective bearing sleeved on the rotatory shaft. The rotatory shaft includes a main body connected to the magnetic steel and two end portions, respective bearings are sleeved on the two end portions respectively, and a diameter of the main body is smaller than diameters of the two end portions.

The utility model relates to the technical field of photovoltaic mobile houses, and provides a photovoltaic mobile house capable of adjusting the angle of a photovoltaic panel. The photovoltaic mobile house capable of adjusting the angle of the photovoltaic panel comprises a house body, an adjusting mechanism and a photovoltaic power generation panel, the house body comprises a base, a wall body and a roof, a plurality of locking universal wheels which are evenly distributed are installed on the lower surface of the base, the matched wall body is fixedly connected to the upper surface of the base, an inlet and an outlet are formed in the wall body, and the adjusting mechanism is arranged on the roof. The upper end of the wall body is fixedly connected with a roof, the upper surface of the roof is connected with an adjusting mechanism, the adjusting mechanism comprises a stepping motor, a rotating shaft, a rotating table, a frame plate, a supporting plate and an air cylinder, and the stepping motor is installed on the upper surface of the roof. According to the photovoltaic mobile house capable of adjusting the angle of the photovoltaic panel, in the using process, the direction and the inclination angle of the photovoltaic power generation panel can be adjusted according to sunlight, solar energy resources are utilized more sufficiently, and the energy conversion efficiency is effectively improved.

Provided a stepper motor, includes a shell, a stator assembly, and a stator assemblies. The rotor assembly includes a rotary shaft and a steel magnet. The stator assemblies are sleeved to the rotor assembly and arranged in an axial direction of the rotary shaft. Each stator assembly includes a housing, a fixation claw pole, and a winding. The housing includes a housing body fixed to the shell, and an inclined structure portion formed by localized depression of an outer periphery of the housing body toward the rotor assembly. A circuit board is affixed to the housing body, an orthographic projection of the circuit board toward the rotor assembly at least partially falls into a confine of the inclined structure portion, the inclined structure portion is provided with an avoidance hole, and a lead of the winding extends out via the avoidance hole and is electrically connected to the circuit board.

The embodiment of the invention provides rocker arm type adjustable ship charging equipment, and relates to the technical field of energy supply device manufacturing. The rocker arm type adjustable ship charging equipment comprises a base, a sliding rail, a rocker arm assembly and a winding mechanism. One end of the screw rod is driven by a stepping motor to rotate; the lower end of the main shaft is rotationally connected with the base, a servo motor used for driving the supporting arm to rotate around the upper end of the main shaft is installed on the main shaft, and a forward and reverse rotation motor used for driving the main shaft to rotate is installed in the base; the winding wheel is rotationally installed at the rear end of the sliding rail, and the take-up and pay-off driving unit is used for driving the winding wheel to rotate. Position deviation is monitored in real time through an installed sensor, a fine adjustment mechanism is automatically triggered, and the stability of charging butt joint is ensured; the winding wheel adopts a spiral line groove design and is matched with a guide mechanism to realize ordered arrangement of cables, so that the common problems of disordered wires and overlapped wires of a traditional winding device are solved, and the manual arrangement and maintenance cost is reduced.

The utility model discloses a magnetic steel positioning mechanism of a decorative ring assembly, which comprises a large support, a decorative ring assembly arranged on the large support and rotatably connected with the large support, and a stepping motor driving the decorative ring assembly to rotate, the stepping motor is fixed on the large support, one end of the decorative ring assembly is fixedly provided with a rotating shaft, and the other end of the decorative ring assembly is fixedly provided with a magnet. The rotating shaft is provided with a magnetic steel assembly, and the large support is fixedly provided with a Hall sensor module matched with the magnetic steel assembly. According to the utility model, the acting surfaces of the decorative ring assembly are switched through the stepping motor, so that different shapes are presented, different light requirements are met, a dynamic effect of rotation of the decorative ring assembly is generated when the decorative ring assembly rotates, and compared with a single light effect of sequential lighting of a conventional light source, the light effect is richer.

A control system for a can decorator structured to apply images to cans includes a can inspection system structured to capture images of a can, a controller structured to receive the captured images and to analyze the captured images to determine a quality of the image applied to the can based on a comparison of the captured images and a reference image, and an adjustment assembly structured to adjust a circumferential or translational position of a plate cylinder attached to a plate cylinder shaft end of a plate cylinder shaft, the adjustment assembly including at least one stepper motor, wherein operation of the at least one stepper motor causes the circumferential or translational adjustment.

The utility model belongs to the technical field of water-turbine generator set speed regulation system control, and provides a 2 + 3 mode multi-redundancy speed regulation system, which comprises an electrical control component and an execution component, the execution component comprises a double-fine oil filter, a self-centering motor device, a main distributing valve, a first servo proportional valve, a second servo proportional valve, a double-proportional-valve switching valve, a motor / proportional valve switching valve, an emergency stop hydraulic valve and an emergency stop electromagnetic valve. According to the utility model, a proportional valve and stepping motor redundancy control mode or a double-servo proportional valve redundancy control mode and the like can be flexibly selected according to requirements, various fault conditions occurring in the operation process of equipment can be easily handled, and the reliability and the control stability of the equipment are greatly improved.

The utility model discloses efficient and energy-saving facet type automobile crystal gear shifting toggle grinding and polishing equipment which comprises a support and a grinding and polishing device, a displacement mechanism used for driving the grinding and polishing device to move in a three-dimensional mode is arranged above an inner cavity of the support, and a rotating mechanism used for driving the grinding and polishing device to rotate is arranged at the bottom of the displacement mechanism. A clamping mechanism used for clamping and fixing the facet type automobile crystal gear shifting toggle button is arranged below an inner cavity of the support, a second stepping motor used for driving the clamping mechanism to turn over is arranged on the support, and a liquid spraying mechanism used for conveying polishing liquid is arranged on the support. An adjusting mechanism used for adjusting the spraying angle of the polishing solution is arranged between the solution spraying mechanism and the rotating mechanism, and a collecting mechanism used for collecting the polishing solution is arranged at the bottom of the support. According to the multi-angle grinding and polishing device, multi-angle grinding and polishing can be achieved, the polishing time is effectively shortened, the polishing efficiency is improved, redundant polishing liquid can be collected and recycled in a unified mode through the collecting mechanism, and the purposes of high efficiency and energy saving are achieved.

The invention provides a headlamp position adjusting system based on ripple waves of a brush direct-current motor. The headlamp position adjusting system comprises a whole vehicle height sensor and a steering angle sensor, wherein the whole vehicle height sensor and the steering angle sensor are used for collecting vehicle height and steering data in real time; the MCU control unit receives data of the whole vehicle height sensor and the rotation angle sensor and calculates the number of target rotation turns of the motor and the number of corresponding ripple pulses; the motor driving unit drives the brush direct current motor to operate; the current acquisition circuit acquires a ripple signal in the running current of the motor; the direct-current filter circuit filters direct-current components in the current signals; the ripple amplifying circuit amplifies the filtered alternating current ripple signal; and the ripple conversion circuit converts the amplified ripple signal into a pulse signal which can be identified by the MCU. The brush direct current motor is adopted to replace a traditional stepping motor, a drive circuit only needs a single full bridge, and the hardware cost is reduced by about 50%; a control circuit and a shielding wire harness in the motor are omitted, and the number of wire harnesses and connectors and the manufacturing cost are reduced.

The utility model discloses a robot stacking and carrying device which comprises a fixing disc installation head, a stepping motor is fixedly installed on one side of the interior of the fixing disc installation head, and an output shaft of the stepping motor is connected with a transmission rotating shaft through a coupler. The front end face of the transmission rotating shaft is connected with a circular roller bearing block installed on the inner wall of the fixing disc installation head through a roller bearing, an internal thread groove is formed in front of the circular roller bearing block, and a fixing disc is arranged in front of the internal thread groove. And a fixing disc thread fixing rod located in the internal thread groove is fixedly arranged in the middle of the rear end face of the fixing disc, and an external thread column also located in the internal thread groove is arranged behind the fixing disc thread fixing rod. According to the utility model, different types of fixing discs can be automatically disassembled and assembled, when different types of fixing discs need to be installed according to different carried objects, manual replacement is not needed any more, and the convenience of equipment is improved through the technical scheme.

The invention relates to a method for the open- / closed-loop controlling of a stepper motor. The stator windings of the stepper motor are controlled via a full-bridge circuit with switching elements. The switching elements can be controlled in such a way that a rapid-decay mode or a slow-decay mode can be set. A charge cycle time in a pulse width modulation (PWM) period is stored, and the rapid-decay mode or the slow-decay mode for the next PWM period is set according to the charge cycle time. The invention additionally relates to a control unit, and a stepper motor comprising the full-bridge circuit and the control unit.

The invention discloses an experimental device for controlling a structured turning tool to machine a roller surface nano-structure through normal force, and belongs to the field of nano-structure machining. The turntable mechanism is arranged on the base, and a portal frame is arranged at the upper end of the base; the portal frame is fixedly connected with a cutting mechanism; the cutting mechanism comprises a z-direction stepping motor guide rail fixedly connected to the portal frame. The piezoelectric displacement table is fixedly connected with a force sensor clamp; one end of the force sensor clamp is fixedly connected with a force sensor; the lower end of the force sensor is fixedly connected with the cutter; and the rotary table mechanism is fixedly connected with the metal roller. And the guide rail of the z-direction stepping motor drives the cutter to approach the surface of the metal roller. According to the device, a plurality of nano structures can be machined through one-time feeding, and the machining efficiency is improved. And the normal force in the cutting process is sensed in real time through the force sensor, the piezoelectric displacement table drives the tool to do nanoscale micro-motion, precise displacement compensation is conducted on movement such as axial jump in the machining process, and millN-level control over the cutting normal force is achieved.

The invention discloses an unknown environment mapping method for a single-beam laser of aircraft, which belongs to the field of three-dimensional map reconstruction technology. Firstly, the data collected by a single-beam LiDAR is aligned with the timestamp of the stepper motor, and the obtained point cloud data is filtered and matched to obtain three-dimensional map information. The pose of the aircraft is estimated by the wheel odometer and IMU, and the loop detection is performed to reduce the cumulative error and update the three-dimensional map information in real time. The frontier search algorithm is used to determine the target point of the aircraft flight, the A* algorithm is used to plan the path trajectory, and the B-spline curve optimization algorithm is used to make the trajectory of the aircraft smoother. The control command is sent to the aircraft, and then the global three-dimensional map of the unknown environment is obtained.

The utility model provides an automatic reversing box of a climbing mechanism, which comprises a lower cover plate and an upper cover plate, a plurality of vertical wall plates are fixedly mounted between the lower cover plate and the upper cover plate, a climbing head shaft is rotatably mounted among the wall plates, a hammer-shaped climbing head is fixedly mounted on the climbing head shaft, and one end of the climbing head shaft is fixedly connected with an output shaft of a stepping motor; the stepping motor is fixed on the outer wall of the wall plate; the conical end of the hammer-shaped climbing head is hinged to one end of the spring buffer, and the other end of the spring buffer is hinged to the wall plate through the spring buffer seat plate. According to the reversing box, the PLC controls the stepping motor to conduct intelligent reversing, so that the problems that an existing reversing box needs manual reversing and is not high in safety performance are solved, and the defects of the climbing automatic reversing box are overcome.

The invention discloses a qualitative detection method and device for tiny linear defects on the surface of a magnetic shoe and a medium, and relates to the technical field of magnetic material nondestructive testing. Scattering characteristics of defects in different directions are highlighted through dynamic adjustment of a light source azimuth angle, and a multidirectional illumination imaging system comprising a low-angle linear light source and a high-resolution polarization camera is constructed; except for the light source, the camera moves along the axial direction through the stepping motor to dynamically collect images; designing a preprocessing algorithm based on histogram of oriented gradient enhancement, and performing multi-scale feature fusion analysis on the defect region in combination with a deep convolutional neural network; and a lightweight classification model based on transfer learning is developed, and accurate distinguishing of microcracks and pseudo defects is achieved. The corollary equipment integrates a light source control module, an image acquisition unit and an embedded processing platform, and supports real-time dynamic detection. According to the invention, the detection limit of traditional machine vision on submillimeter linear defects is broken through, and the omission ratio is reduced to 0.5% or below.

A hand-held tool enables accurate, micro-radian rotation of a control element. The tool includes an adjustment shaft extending distally from an adjusting element, and a reducer within a housing that mechanically couples the adjustment shaft to a distal tool shaft. Rotating the tool as a whole directly rotates the tool shaft, while rotating only the adjustment shaft causes the reducer to apply a smaller rotation to the tool shaft according to a reduction factor that can be between 16 and 1024. The adjusting element can be a manually rotated knob, or a motor, such as a stepper motor, actuated by a switch, such as a momentary contact, rocker, or pushbutton switch. The reducer can include one or more planetary gear stages, and / or one or more strain wave gear stages. The tool can have a length not more than 5 inches and a diameter not more than 0.6 inches.

The application discloses a display cabinet with self-adaptive adjusting air duct, which comprises a cabinet body, an air adjusting assembly and a monitoring box, the air adjusting assembly comprises a lower layer plate and an air duct plate, the air duct plate is provided with variable air ducts and a plurality of fixed air ducts, each separated variable air duct is rotationally connected with an adjustable fan blade, two temperature controllers are installed at the lower end of the rear wall of the monitoring box, two sensors are arranged on the inner wall of the first rear back plate located at the bottom of the air adjusting assembly and the rear side thereof; the variable air ducts and the adjustable fan blades are arranged to sense the temperature changes at different positions in the cabinet body, the adjustable fan blades are driven to rotate by the rotation of the stepping motor, the direction of the air duct is adjusted, the cold air in the cabinet body is uniformly circulated, the temperature at each position in the cabinet body is kept consistent at all times, the temperature controllers are arranged to detect the temperature more accurately, the power consumption of the display cabinet is reduced, and the controller is communicated with the cloud platform to realize the temperature detection of the cabinet body and timely feedback the operation state of the air duct.