7results about How to "Small repeatability error" patented technology

The invention discloses a six-dimensional force sensor, which relates to the field of sensor technology. The outer end of the radial beam is connected to the middle of the floating beam to form a "T" beam; each beam is evenly distributed in the circumference, and its radial beam is arranged along the radial direction, and the floating beam is arranged vertically, and the inner end of each radial beam is connected to the center platform; the top and bottom ends of each floating beam are respectively fixedly connected to the circumferential support, and the center platform and the circumferential support are provided with positioning holes; the radial beam is provided with a radial beam vertical through hole penetrating its upper surface and lower surface and a radial beam transverse through hole penetrating its two side surfaces, and the floating beam is provided with a floating beam transverse through hole penetrating its two side surfaces; strain gauges are arranged on both sides of the radial beam vertical through hole, the radial beam transverse through hole and the floating beam transverse through hole. The sensor of the present invention is provided with transverse through holes and vertical through holes on each radial beam, and transverse through holes on each floating beam, so that the strain on the beam is concentrated on both sides of each through hole, which can effectively improve the resolution of the sensor while ensuring the rigidity of the sensor.

The present invention discloses a novel quartz crystal microbalance with a concave platform annular structure, comprising a quartz wafer with a concave platform, metal electrodes attached to the upper and lower surfaces, the lower surface being a circular electrode, and the upper surface being an annular electrode; the lower surface of the quartz wafer is flat, and an anti-table is etched in the central area of ​​the upper surface, the radius of the anti-table is greater than the radius area of ​​the circular electrode, and the surrounding area remains unchanged. The present invention improves the structure of the annular quartz crystal microbalance, and solves the problem of the absolute mass sensitivity decrease of the annular electrode QCM when the mass sensitivity is homogenized by etching a groove. This special design not only reduces the repeatability error, but also improves the detection accuracy.

The invention discloses magnetic field ejection force test equipment and a magnetic force test method, the magnetic field ejection force test equipment comprises a base, a plate body, a support member, a supporting device, an induction device and a heavy frame, the plate body is fixed above the base, the plate body is provided with a through hole, the through hole penetrates through the plate body along the vertical direction, and the plate body is suitable for placing a lifting magnet; the supporting piece is arranged in the through hole in a matched mode, the length of the supporting piece is larger than that of the through hole, and the supporting piece can stretch out of an upper hole opening of the through hole so that the lifting magnet can be ejected out of the plate body. The supporting and jacking device is arranged on the base and suitable for jacking and pushing the supporting piece so that the supporting piece can stretch out of an upper hole opening of the through hole; the sensing device is connected with the supporting and jacking device, the sensing device is arranged between the base and the lower ends of the supporting pieces, the sensing device is suitable for monitoring the supporting and jacking force of the supporting and jacking device, the heavy frame is matched between the supporting and jacking device and the multiple supporting pieces, and the heavy frame is suitable for synchronously jacking and pushing the multiple supporting pieces when the supporting and jacking device is used for supporting and jacking. The magnetic field ejection force testing equipment is simple and convenient to operate, high in safety, high in testing efficiency and high in testing precision.

The invention discloses an unmanned aerial vehicle automatic coal inventory system and method suitable for a gas film closed coal yard, and the system comprises an unmanned aerial vehicle, a feature device, a server, a remote control device, a WIFI system, and a bucket wheel machine full-automatic control system, and the unmanned aerial vehicle comprises an unmanned aerial vehicle body, a control device, an airborne PC, an IMU, and a laser radar. The server and the bucket wheel machine full-automatic control system are connected to the local area network through network cables, the WIFI system is connected to the local area network, the airborne PC is provided with a WIFI module and is connected to the WIFI system through a WIFI network, and the remote control device is in low-rate data communication with the control device in a wireless mode. The method has the following advantages and effects that in the gas film closed coal yard, the unmanned aerial vehicle is automatically driven to fly, the laser scanning data of the coal yard is obtained, the three-dimensional model of the coal yard is established, the amount of each coal pile is calculated, the coal stocktaking efficiency is improved, the investment and maintenance cost of a coal stocktaking system is reduced, and the time for coal stocktaking personnel to make contact with the severe environment of the closed coal yard is shortened.

The invention discloses a biochar purification process, and relates to the technical field of biochar preparation, biochar raw materials are screened, impurity particles with the particle size larger than 50 meshes are removed, and the moisture content of the screened raw materials is controlled to be smaller than or equal to 15%; putting the pretreated raw material into a nitric acid solution with the concentration of 0.1-0.5 mol / L, stirring and dipping at 50-70 DEG C for 1-3 hours, and then washing with deionized water until the raw material is neutral; alkali washing treatment: dipping the raw material subjected to acid washing and drying in a potassium hydroxide solution with the concentration of 0.2-0.6 mol / L, stirring and dipping at 40-60 DEG C for 2-4 hours, and washing with deionized water again until the raw material is neutral; pyrolyzing and purifying; physical screening; and chemical activation. Compared with the prior art, the invention has the advantages of optimized graded pore structure, high purity, low ash content, improved process stability, energy saving, consumption reduction and environmental protection.

The invention relates to the technical field of wafer alignment, in particular to wafer alignment equipment and a wafer alignment method. The wafer alignment equipment comprises a frame, an image acquisition assembly, a Z-direction driving mechanism, a first carrying table and a second carrying table, the first carrying table is connected with the frame through the Z-direction driving mechanism, the Z direction is perpendicular to the bearing face of the first carrying table, and the second carrying table is installed on the frame. The bearing surface of the first carrying table is used for bearing a first wafer, and the bearing surface of the second carrying table is used for bearing a second wafer; the image acquisition assembly is mounted on the frame and is used for acquiring an edge image of the first wafer and an edge image of the second wafer; the first carrying platform and the second carrying platform can form a multi-degree-of-freedom micro-motion structure. The wafer alignment method is applied to the wafer alignment equipment. The wafer alignment equipment and the wafer alignment method provided by the invention are high in efficiency and precision, convenient to control, small in size, light in structure and good in flexibility of whole machine integration.

This application relates to the technical field of communication equipment testing and discloses a cavity filter tuning fixture. The fixture includes a test base, a tuning fixing block, and a tuning clamp. The filter under test (DUT) is placed on top of the test base, and the tuning fixing block is mounted on top of the DUT. The tuning fixing block is detachably connected to the test base, and the tuning clamp is movably connected to the bottom of the test base. The tuning fixing block has a first guide hole, and the top interface of the DUT is inserted into the bottom end of the first guide hole. A test cable interface passes through the top end of the first guide hole and connects to the top interface of the DUT. A guide step protrudes from the top of the test base, and the guide step has a second guide hole. The guide step is inserted into the bottom interface of the DUT, and another test cable interface passes through the bottom end of the second guide hole and connects to the bottom interface of the DUT. The tuning clamp engages with the test cable interface. This application enables rapid installation of 5G filters onto the test fixture, saving assembly time and improving production efficiency.