82results about How to "Reduce angle error" patented technology

The invention provides a rod bundle channel flow pressure measuring test device, which comprises a water storage tank, a pressure measuring body, and a centrifugal pump, a regulating valve and a thermometer sequentially connected with the water storage tank through a pipeline, wherein the pressure measuring body comprises a rod bundle channel barrel, a rod bundle channel formed by rod bundles arranged in the rod bundle channel barrel; the upper ends of the rod bundles are connected with a high-accuracy rotating disk arranged on a rotating table support through a coupler; two body pressure ports formed up and down are formed in the rod bundle channel barrel; a pressure guiding port is formed in each rod bundle of the rod bundle channel; a sealing rubber plug is arranged at the lower end of each rod bundle; a fast adapter is arranged at the upper end of each rod bundle; pressure difference transmitters are respectively arranged between each pressure guiding port and each fast adapter as well as between the two body pressure ports. The rod bundle channel flow pressure measuring test device provided by the invention can simulate single-phase flow in a reactor rod bundle channel so as to research a resistance characteristic of the rod bundle channel, and is simple in structure, low in cost, accurate and convenient to acquire data, and wide in research working condition range.

The invention provides an iron core loss-based direct torque control method for an ultra-high-speed permanent magnet synchronous motor. The invention discloses an iron core loss-based mathematical modeling method for the ultra-high-speed permanent magnet synchronous motor; a voltage equation, a flux linkage equation and a torque equation are adopted in motor rotary speed control by adopting the direct torque control method, wherein the flux linkage value is obtained by three-phase current calculation through a finite element analysis method; and iron core loss is taken into consideration in the voltage equation, and the iron core loss is converted into equivalent resistance. The method disclosed in the invention can be applied to the ultra-high-speed permanent magnet synchronous motor control system based on sensor-less rotary speed estimation; and angular error caused by iron core loss in the sensor-less rotary speed estimation can be effectively lowered.

The invention provides a positioning tool of an eccentric shaft and a machine tool. The positioning tool comprises a chuck assembly, a transmission part eccentrically fixed to the chuck assembly, an angle positioning jacket, a front tip, and a rear tip, the angle positioning jacket is connected with the transmission part and is provided with a positioning hole, the positioning hole is conical, andis used for radially fixingthe eccentric shaft, the front tip is fixedly arranged on the chuck assembly, the rear tip is fixedly arranged on the machine tool, and the front tip and the rear tip are used for abutting against the two axial ends of the eccentric shaft. Through the technical scheme, different specifications of eccentric shafts can be rapidly clamped and positioned, the machining precision of the eccentric shaft can be improved, the scrappage is reduced, the positioning tool is simple in structure, only few parts like a spline positioning sleeve need to be replaced, the replacingwork intensity of the positioning tool of the eccentric shaft can be reduced, and the replacing efficiency of the positioning tool is improved.

The invention relates to the improvement of a blade pitch changing device of a wind power generation device, which is characterized in that a blade angle deflection driving mechanism consists of rocker bar members, pull rods and an axially telescopic power mechanism, wherein the rocker bar member is fixed on each blade shaft, the pull rods drive the rocker bar members to rotate, the axially telescopic power mechanism drives each pull rod to synchronously and axially move, and both ends of each pill rod are respectively connected with a rocker and a movable axially telescopic mechanism throughmovable pivots. The blade pitch changing device has the biggest characteristics that the blade pitch changing device is greatly simplified, the weight is greatly lightened, the megawatt-level weight is less than one fifth of the weight in a gear type, the reliability and the angle modulation consistency are good, and the blades are simply installed and adjusted, thereby being completely used for adjusting the blade pitch of a megawatt-level wind power generation device.

The invention discloses a mine transient electromagnetic automatic observation method based on multi-field information feedback, which belongs to the technical field of mine safety comprehensive prevention and control. The adopted observation system includes a mine transient electromagnetic detection system host, transmitting and receiving coils and a multi-field information feedback device. The observation method comprises steps: zero-point correction is carried out on the multi-field information feedback device, and a multi-field information initial value is acquired; transient electromagnetic measurement points are arranged according to the design of a detection scheme, a conventional observation system is arranged, the transmitting and receiving coil is arranged at each transient electromagnetic measurement point, and transmitting of transient electromagnetic primary field signals and receiving of induction secondary field signals are completed in sequence; data are acquired and processed; and other steps. The mine transient electromagnetic detection field environment can be reflected more accurately, and through real-time feedback and acquisition and storage of multi-field information transient electromagnetic data, random placement of mine transient electromagnetic underground transmitting and receiving coils, disorder measurement and automatic observation can be realized, and the transient electromagnetic detection efficiency and the resolution are improved.

The invention relates to a method for generating equally-segmented ray beams for positive ray tracing. The method includes the steps that a source is placed in the center of an irregular polyhedron; the center of each face of the irregular polyhedron is connected with the vertex of the face; a triangle on each face is subjected to geometrical segmentation till a ray beam formed by the source and the vertex of each triangle meets the preset condition. According to the method, equally-segmented ray beams are approximately generated through the irregular polyhedron, positive ray tracing can be achieved faster, and angle errors between the equally-segmented ray beams can be reduced.

The invention discloses a photographing method. The photographing method is executed in a computing device, and the computing device is suitable for controlling a camera to photograph a product, and the product comprises a first display area and a second display area. The photographing method comprises the steps: acquiring a first interval angle of the first display area during shooting and a second interval angle of the second display area during shooting, wherein the first interval angle is smaller than the second interval angle; establishing a sequence frame angle array of the product basedon the first interval angle and the second interval angle; controlling a camera to photograph the product at a preset photographing angle based on the sequence frame angle array, and obtaining a sequence frame of the product corresponding to the preset photographing angle; and sending the sequence frame to a server, so that the server processes the sequence frame into a panoramic picture. The invention also discloses a corresponding photographing device and a panoramic photographing system. According to the technical scheme, the product sequence frame pictures can be shot automatically, and product details and key areas can be displayed to customers more clearly and completely.

The invention discloses a novel labyrinth forming device which comprises a rolling mill and a bending machine. The rolling mill comprises a rolling inlet assembly, a rolling mill base, a rolling outlet assembly, a fixed gearbox assembly, a rolling wheel assembly, a power assembly and a rolling mill width adjusting assembly. The bending machine comprises a conveying assembly, a bending machine base, a bending machine width adjusting assembly, lateral positioning assemblies, a movable bending assembly, a fixed bending assembly, upper molds and turnover molds. The conveying assembly is connected with the rolling outlet assembly. According to the novel labyrinth forming device, rolling and bending are combined, so that the size error of labyrinth forming is reduced by 4 times, the angle error of labyrinth forming is reduced by 3 times, and the requirement for the installation size of an existing refrigerator is met.

The invention discloses orthodontic force measuring equipment for tooth correction, and relates to the technical field of tooth correction. The orthodontic force measuring equipment for tooth correction comprises an arc-shaped frame, wherein the upper end of the arc-shaped frame is connected with a connecting support frame; the outer side surface of the upper end of the connecting support frame isconnected with an adjusting plate; the outer side surface of the adjusting plate is connected with a connecting plate; the middle part of the connecting plate is provided with an adjusting groove; the middle part of the surface of the arc-shaped frame is provided with a transverse groove; and vertical grooves are correspondingly formed in the surface of the arc-shaped frame and are positioned atthe upper end and the lower end of the transverse groove. According to the orthodontic force measuring equipment, the adjusting plate, a transverse adjusting rod and a longitudinal adjusting rod are used for cooperation; in addition, the vertical grooves cooperate with the transverse groove, so that the adjustment of a measuring mechanism is more accurate; and meanwhile, the arch wire clamping plate is matched with the effects of reset springs and slide blocks, so that the fast positioning and fixation on an arch wire is realized. The problems of binding complexity and insufficient binding firmness during the arch wire fixation by a traditional measuring device are solved, so that the accuracy and the efficiency of the tooth orthodontic force measurement are improved.