54results about How to "Accurate and stable position" patented technology

The invention relates to an LED panel lamp which comprises a frame, an LED lamp bar, positioning blocks and a light guide plate assembly, wherein the frame is formed by connection of two first frame profile bars and two second frame profile bars through four corner connection pieces, the two first frame profile bars are arranged oppositely, four corners of the light guide plate assembly are limited in clamping spaces of the four positioning blocks respectively, the four positioning blocks are fixed at the four corners of the frame, first profile bar cover plates are arranged on the first frame profile bars and mounted on the first frame profile bars in a detachable connection manner, the middles of the first profile bar cover plates extend downwards to form positioning bars, and the LED lamp bar is limited among the positioning bars and the positioning blocks; second profile bar cover plates are arranged on the second frame profile bars. The LED lamp bar is easy and convenient to replace, maintain and operate and is time-saving and labor-saving.

The invention relates to a detection system and a method for monitoring fracture development of a coal pillar-free gob-side entry retaining floor. The method comprises the following steps of chiseling a floor drilling field at one side of the coal pillar-free gob-side entry retaining, drilling in a floor rock layer according to different angles, gradually butting transparent hollow pipe sections by a butting sealing system, and sending into each drilling hole; grouting and anchoring a gap between each drilling hole and the corresponding transparent hollow pipe, enabling a detection positioning assembly to record the fracture of the drilling surrounding rock according to different scales of a measuring tape, performing monitoring tasks on evolution of floor mining failure rule for multiple times in different mining phases until the data is stable, and then finishing the observation. The method has the advantages that the floor small-angle drilling hole, the floor medium-angle drilling hole, and the floor large-angle drilling hole extend from the drilling field to the floor of a to-be-mined coal layer and are distributed in parallel in a stereo way; by observing the fracture condition of adjacent drilling holes in the same time and the fracture condition of the same drilling hole in different coal mining phases, the development state of the plastic failure area of the floor and the development state of the failure area of the floor after the coal bed is mined are determined, so as to provide reliable data reference for safety construction.

The invention discloses an anti-geometric attack digital watermarking method based on phase consistency and pre-cancellation. In the embedding process, first calculate and extract the points with high carrier phase consistency to form a feature point set; calculate the two-dimensional convex hull of the feature point set, number and divide the boundary points of the convex hull to form a triangular network, and each triangle It is called the carrier cell; the carrier cell is transformed into a standard triangle by affine inverse transformation; before embedding the watermark signal, it is pre-offset, and the projection of the carrier signal on the watermark signal is removed from the watermark signal; finally, the The watermark is superimposed on the standard triangle of the carrier, and the carrier cell containing the watermark is obtained through affine transformation. In the watermark extraction process, first analyze and extract the feature points with high phase consistency, calculate and divide the convex hull, generate a triangular network, transform it into a standard triangle, decode it with the watermark template, and extract the watermark in the carrier cell cavity. Even if the watermarked image is attacked by local geometry, the watermark can be extracted correctly.

The invention provides an automatic core-setting robot and an automatic core-setting method. The automatic core-setting robot includes a linear transmission device, a gantry truss and a transfer robot. The transfer robot includes an X-axis moving mechanism, a Y-axis moving mechanism, a Z-axis moving mechanism and a rotating mechanism. It also includes a supporting jig combination composed of a floating plate, a sand core mold, a fixture support frame, a sand core jig and a second quick-connecting mounting bracket. The positioning structure between the matching jig combinations can ensure that the sand core jig quickly Stable installation and replacement; when setting the core, you only need to hoist the sand core from the sand core warehouse to the sand core mold, and the linear transmission device and transfer robot will automatically complete the core setting operation, which greatly improves the production efficiency; The installation position in the lower mold of the casting molding is precise, ensuring reliable and stable casting quality.

The invention relates to an acupoint knocking device which comprises an executing component and a driving mechanism; the driving mechanism drives the executing component to act on acupoints at presetfrequency and pressure intensity. Human factors can be overcome, corresponding strength, frequency and knocking time can be set according to different acupoints, and acupoint stimulation can be stablyand effectively implemented by adopting a proper fixing method.