6results about How to "Eliminate precision errors" patented technology

The present application relates to a tester and a differential comparator calibration device thereof, the device comprising: a pin circuit module comprising a differential arithmetic unit, a first channel comprising a first drive digital-to-analog converter, a first comparison digital-to-analog converter unit and a first differential comparator unit, and a second channel comprising a second drive digital-to-analog converter, a second comparison digital-to-analog converter unit and a second differential comparator unit; the second channel includes a second driving digital-to-analog converter, a second comparison digital-to-analog converter unit, and a second differential comparator unit. The first driving digital-to-analog converter outputs a first driving signal to the differential arithmetic unit, and the second driving digital-to-analog converter outputs a second driving signal to the differential arithmetic unit. The differential mode output end of the differential arithmetic unit outputs a differential mode signal to the first differential comparator unit, and the common mode output end of the differential arithmetic unit outputs a common mode signal to the second differential comparator unit. And the calibration module is used for calibrating the first differential comparator unit / the second differential comparator unit according to the comparison result level output by the first differential comparator unit / the second differential comparator unit.

The invention discloses a printed circuit board and a preparation method thereof, and the printed circuit board comprises a plurality of basic conductive layers and a positioning conductive layer clamped between the plurality of basic conductive layers. A plurality of targets are arranged on the positioning conductive layer; wherein the basic conductive layers correspond to different targets respectively, and the basic conductive layers are obtained through pattern preparation after alignment based on the corresponding targets. By means of the mode, the alignment precision of the patterns of the basic conducting layers can be greatly improved, and the structural accuracy and reliability of the printed circuit board are improved.

The present application discloses a gear assembly structure and a gear assembly adjustment mechanism, and relates to the technical field of gear assembly. The gear assembly adjustment mechanism of the present application includes a press-fit block, a support foot, and an adjustment ball shaft. The press-fit block has a mounting hole that passes through the press-fit block, and the mounting hole includes a positioning ball hole and a connecting hole that are arranged in a communication manner; the support foot is connected to the press-fit block, and is used to abut against the gear; the adjustment ball shaft includes a sphere and a connecting shaft that are connected in sequence, the connecting shaft is used to be connected to the gear shaft, and the sphere is used to match the positioning ball hole; wherein the connecting shaft is passed through the connecting hole, and the sphere stays in the positioning ball hole. Therefore, the present application can eliminate the precision error through the mutual cooperation of the gear assembly structure and the gear assembly adjustment mechanism, as well as the self-aligning function of the adjustment ball shaft, improve the initial assembly accuracy of the gear and the gear shaft, realize the one-time assembly of the gear and the gear shaft, avoid the subsequent disassembly and reassembly of the gear and the gear shaft that do not meet the assembly accuracy, and reduce the processing cost.

The invention relates to an automatic detection device and method for the half chord length of a plate spring under a set load, and belongs to the technical field of plate spring detection.The automatic detection device comprises a device body, a workbench and an oil cylinder are installed on the device body, a pressure head fixing base is fixed to the lower end of the oil cylinder, a pressure sensor is fixed to the lower portion of the pressure head fixing base, and a pressure head A is installed below the pressure sensor; a lower die plate is fixed above the workbench, two sets of trolley assemblies are arranged on the lower die plate in a sliding mode, and the trolley assemblies support the plate spring through detection mandrels; the center of the lower template is connected with a positioning mandrel; a stay wire encoder is arranged right behind the center of the lower die plate, a fixing block is further installed on the trolley assembly, and the output end of the stay wire encoder is fixed to the fixing block. A pressure head B is further included; the semi-chord length of the plate spring is obtained by reading the distance from the output end of the stay wire encoder to the stay wire encoder, the semi-chord length parameter of the plate spring is specially detected in combination with the mechanical measurement unit, the precision error of manual measurement is eliminated, and the detection efficiency is improved.

The utility model provides a kind of floating self-centering type fixture structure for improving bushing press fitting accuracy, including base assembly and upper press head assembly, the base assembly includes the press fitting base for supporting product, the press fitting base is internally provided with the positioning mandrel that can float up and down, the top end of the positioning mandrel can be installed bushing after being passed out the inner hole of product;The upper press head assembly includes upper press head, the upper press head is internally provided with the centre of the top that can float up and down, the tip of the centre of the top projects upper press head setting and can be with the axial center of positioning mandrel cooperation centring, the centre of the top can be driven down after moving down positioning mandrel and bushing is pressed into the inner hole of product.

The utility model discloses a galvanometer motor position installing and debugging table, which relates to the technical field of laser galvanometer debugging and comprises a marble base, a supporting plate is vertically installed on one side of the upper end of the marble base, a datum plate is installed on the side wall, close to the center position of the marble base, of the supporting plate, and the datum plate is arranged on the side wall of the marble base. A vibrating mirror fixing seat is mounted on one side, far away from the datum plate, of the upper end of the marble base, a red light emitter which vertically emits red light upwards is mounted at the bottom of the vibrating mirror fixing seat, and a through hole is formed in the vibrating mirror fixing seat right above the emitting end of the red light emitter. According to the utility model, the marble material has the characteristic of difficult deformation, even in a high-temperature environment, the marble material cannot expand with heat and contract with cold, the continuity and stability of debugging precision can be well maintained, the size is small, the precision is high, and the datum plate and the galvanometer fixing seat which are processed and formed at one time are adopted, so that the precision error generated by secondary processing is eliminated.