5results about How to "Low anti-interference" patented technology

This invention discloses a dual closed-loop control system and method for rubber mixing pressure in a rubber mixing mill, relating to the field of automation control technology. The system sets a target pressure, monitors the feedback value of the external pressure closed loop, acquires the external pressure closed loop feedback value, calculates a first input value based on the target pressure and the external pressure closed loop feedback value, obtains a first output value based on the deviation between the first input value and a preset first input value threshold, uses the first output result as the input value of the internal pressure closed loop, collects the detected value of the pump inlet pressure, calculates a second input value based on the first output result and the detected pump inlet pressure, adjusts the control pressure of the pump inlet based on the deviation between the second input value and a preset second input value threshold, and controls the speed of the servo motor through a servo controller to stabilize the pump inlet side pressure.

The invention relates to an equipment positioning method and device, equipment, a storage medium and a program product. The method comprises the following steps: acquiring Bluetooth connection strength and Bluetooth distance measurement results of to-be-positioned target equipment and anchor point equipment; constructing a first signal feature of the target device according to the Bluetooth connection strength and the Bluetooth ranging result of the target device; determining a target signal feature matched with the first signal feature in a plurality of pre-constructed second signal features; wherein each second signal feature is associated with a preset area, and each second signal feature is constructed according to the Bluetooth connection strength and the Bluetooth distance measurement result of the calibration device and each anchor device in the corresponding preset area; and outputting a positioning result of the target device according to a preset area associated with the target signal feature. By adopting the method, low-cost, high-precision and high-efficiency equipment positioning can be realized.

This invention belongs to the field of injection molding machine technology, specifically a screw injection molding machine with constant temperature heating of the barrel. The proposed solution includes: an injection unit, with a feed hopper detachably fixed to its side; a power unit, with its top fixed to the bottom of the injection unit; a barrel, with its bottom fixed to the top of the injection unit; a heating mechanism nested on the outer surface of the barrel; vertical rods, with one end fixed to the outer surface of the heating mechanism; a placement plate, fixed to the other end of the vertical rods; and a screw, with its bottom positioned at the top of the injection unit. This invention utilizes a cyclic high-temperature environment to cause significant deformation of the bimetallic strip. After bending, the active and passive layers of the bimetallic strip tightly adhere to the outer wall of the barrel. Heat is directly transferred to the barrel through the metal cap and bimetallic strip in a solid-state heat conduction manner, significantly improving heat transfer efficiency.

The application provides a Doppler positioning method based on frequency hopping spread spectrum, and belongs to the technical field of radio positioning, to solve the problem that the fixed carrier frequency mode adopted by the traditional Doppler positioning technology makes the signal extremely easy to be intercepted, oriented and interfered. The method comprises the following steps: step 1: describing an application scenario; step 2: in the application scenario, a frequency hopping measurement signal is sent by a transmitting end; step 3: in the application scenario, a receiving end performs frequency hopping synchronization and measures a Doppler shift; step 4: a Doppler shift is preprocessed; and step 5: the preprocessed Doppler shift is used to calculate the position of a terminal to be positioned in combination with the relative motion of the transmitting end and the receiving end. The method can obtain the low interception rate and anti-interference ability given by the rapid change of the carrier frequency, and can also use the frequency diversity characteristics of frequency hopping to reduce the positioning performance deterioration caused by the multipath effect, and is suitable for application scenarios with high requirements for robustness, positioning accuracy and other performances.

This invention discloses a high-Q tuned filter, belonging to the field of tuned filter technology. The tuned filter includes two symmetrically arranged resonant cavities, each connected in parallel with an inductor. This invention reduces the current density of a single coil, suppresses high-frequency skin and proximity effects, significantly reduces the high-frequency loss resistance of the inductor, and significantly improves the Q value at the same operating frequency. It directly reduces in-band insertion loss and improves out-of-band rejection depth, resulting in a significant improvement in filtering accuracy and anti-interference capability.