7results about How to "Prevent backward movement" patented technology

This utility model relates to a bending and flattening mold, including an upper mold module and a lower mold module. The lower surface of the upper mold module is provided with a flattening surface for flattening the workpiece. The lower mold module is provided with a mounting groove, in which a fixing block and a longitudinally sliding tube position float are provided, and a stripping ejector pin assembly is provided to provide elastic force to the tube position float. The fixing block is provided with a first positioning groove for positioning the front end of the bent part of the workpiece, and the tube position float is provided with a second positioning groove connected to the first positioning groove and a positioning protrusion for positioning the rear end of the bent part of the workpiece. The mold has a simple structure. When the mold is opened, the bottom surface of the second positioning groove is higher than the bottom surface of the first positioning groove; when the mold is closed, the bottom surfaces of the first positioning groove and the second positioning groove are on the same plane, which facilitates the subsequent flattening of the bent part. The inner surface of the first positioning groove and the positioning protrusion work together to achieve precise positioning of the front and rear ends of the bent part of the workpiece, and the flattening operation is completed by the flattening surface, effectively preventing stripping and improving processing accuracy and efficiency.

The invention relates to an electric connection device which comprises a bridge-type contact, and a busbar socket and a cutter body socket which can be elastically clamped are formed on the two sides of the bridge-type contact respectively. An upper support and a lower support, the upper support is installed on the contact above the knife body socket, the lower support is installed on the contact below the knife body socket, a guide socket is formed between the upper support and the lower support, and the guide socket is located on the front side of the knife body socket; the two sides of the upper support are respectively provided with an upper abutting portion, the two sides of the lower support are respectively provided with a lower abutting portion, and the upper abutting portion and the lower abutting portion on the same side correspond to each other up and down. The two guide top plates are fixed to the two sides of the body slotting tool respectively, the upper side and the lower side of the front end of each guide top plate are each provided with a guide protruding block, and each guide protruding block is provided with a front inclined guide face and a rear inclined guide face. Friction loss between the body slotting tool and the bridge type contact is reduced, and the service life of the electric connection device is prolonged.

The application discloses a flying probe machine with accurate positioning function and dust-free type for PCB, relates to the technical field of PCB detection, and comprises a machine body, a fixing mechanism, a top seat, a workbench and a detection mechanism. The top seat and the workbench are arranged at the upper and lower ends of the machine body respectively. Compared with the flying probe machine for the current PCB detection, the flying probe machine is provided with a feeding assembly and a guide assembly. Different sizes of PCBs are transported into the fixing mechanism through the cooperation of the feeding assembly and the guide assembly, so that the PCBs integrated with high-end chips can be accurately moved to the middle position of the fixing mechanism, and a solid foundation is provided for the accuracy of subsequent probe testing. In addition, the feeding assembly and the guide assembly in the application can directly transport new PCBs into the fixing mechanism after the detection of the PCBs is completed, thereby avoiding the trouble that the traditional flying probe machine for PCB detection needs to take out the previously detected PCB and then place the new PCB to be detected into the fixing mechanism.

This invention provides a method and system for automatically picking up the first arrival time of ultrasonic waves, relating to the field of ultrasonic signal processing. The method involves: acquiring ultrasonic signals and constructing a three-channel input tensor; constructing a mask target sequence and a heatmap target sequence based on the actual first arrival time; constructing and training an encoder-decoder network, employing a residual attention mechanism at skip connections to output modulated features in residual form; inputting the decoder output into the mask branch and the heatmap branch respectively for collaborative learning; fusing the dual-branch outputs during the inference stage, and determining the first arrival time position based on a joint scoring function. The system includes an ultrasonic signal acquisition and preprocessing module, a target label construction module, a picking network construction and training module, and a first arrival time position determination module, used to execute the above method. This invention achieves automatic, high-precision picking of the first arrival time of ultrasonic waves in complex noise environments.

The application relates to the technical field of seats, and discloses a chassis assembly and a seat. The chassis assembly comprises a cushion, a tail plate, a first transmission mechanism and a second transmission mechanism. The first transmission mechanism comprises a first component, a second component and a third component which are rotationally connected in sequence. The second transmission mechanism can push a driven part forward to slide through the tail plate, so that the cushion slides forward. The first transmission mechanism and the tail plate constitute a planar four-bar linkage structure, so that when the tail plate rotates backward, the front end of the cushion is tilted upward. When the tail plate rotates backward, the driven part in the second transmission mechanism drives the cushion to move forward. When a user leans backward, the tail plate can be driven, linkage between the cushion and the backrest is realized, the tail plate rotates to make the cushion move forward and the front end of the cushion tilt upward, so that the safety and stability are improved, the front end of the tilted cushion can support the legs of the user, and the use experience is improved.

The utility model discloses a box turnover machine with buffering and material guiding functions, which comprises a base, a box turnover plate is rotatably arranged on the upper portion of the base, guardrails are arranged on two sides of the box turnover plate, and vertical rods are arranged at the front ends of the guardrails. First sliding sleeves are arranged on the vertical rods in a sliding mode, a supporting rod is arranged between the two first sliding sleeves, a material guiding plate is rotationally arranged on the supporting rod, a transverse rod is arranged on the first sliding sleeves, and a buffering damper is arranged between the transverse rod and the material guiding plate. And a clamping mechanism for clamping the edge of the smoke box is arranged on the guardrail. The utility model aims to provide the box turnover machine with the buffering and material guiding functions, so that the box turnover machine can be effectively prevented from being broken due to falling of tobacco leaves in the feeding process, materials are ensured to fall softly in the box turnover process, and the breakage is reduced.