38results about How to "Amplitude adjustment" patented technology

An antenna array part constituting a communication antenna is composed of a plurality of antenna elements. The antenna elements are arranged on an arc. This allows radio waves to be irradiated also in the exact transverse direction of the antenna array part, thereby making available the communications with an RFID tag positioned in the exact transverse direction. By shifting the phase of a radio frequency signal supplied to each antenna element or adjusting the amplitude of the radio frequency signal, it is possible to change the direction of radio beams irradiated from the antenna array part or expand the width of the radio beams thus making available with RFID tags present in a wider area.

The invention discloses a self-adaptive closed-loop measuring system of a resonant accelerometer, the frequency control adopts a self-adaptive control phase-locked loop structure, and the control modeof a loop filter can be automatically selected according to the change of the external acceleration, the problems that in the prior art, circuit parameters are fixed, and self-adaptive adjustment cannot be achieved are solved, and the contradiction between the response speed and the steady-state phase difference of the phase-locked loop is effectively overcome, so that the measuring range, the scale factor linearity and the zero bias stability of the accelerometer are effectively improved. Meanwhile, the structure is simple, a complex algorithm is not needed, and the system has the advantagesof being simple, efficient and high in adaptability. A PI control unit adopts an incremental algorithm, the improvement of a traditional position type PI algorithm is achieved, a better control effect can be obtained, and the stability of the system is improved; an amplitude control module adopts an alternating current automatic gain control method, a simple and effective amplitude demodulation method is adopted in the module, hardware resources are saved, and the amplitude of the driving signals can be adjusted within a large range.

The invention discloses a variable excitation rolling wheel for a road roller, which comprises a wheel body, a charging mechanism, a buffer mechanism, a balance mechanism and an excitation mechanism. Both ends of the wheel body are provided with bumps. A charging mechanism is fixedly installed on one side of the wheel body, a buffer mechanism is fixedly installed symmetrically inside the wheel body, fixed blocks are fixedly installed at the output ends of the buffer mechanism, and a rotating shaft is fixedly installed between the fixed blocks, so One end of the rotating shaft is rotatably connected to the driving sleeve through a needle bearing, the driving sleeve is fixedly connected to the output end of the hollow shaft motor, one end of the driving sleeve is fixedly connected to the driving wheel, and one side of the driving wheel is fixedly installed with Mounting plate, the top of the mounting plate is fixed with an excitation mechanism, the variable excitation rolling wheel used for the road roller has a simple structure and convenient operation, and can change the amplitude of the vibration inside the equipment to further affect the effect of the road roller To improve, the practicability is higher.

The invention discloses a control device for an electronic product, comprising a signal receiving circuit, a logarithmic differential feedback circuit and a comparative regulated output circuit, wherein the signal receiving circuit receives signals of an input end of a signal transmission channel in the control device of the electronic product; the logarithm differential feedback circuit is divided into two paths to receive the signals output by the signal receiving circuit, in which one path is input to the in-phase input terminal of an operational amplifier AR2 after being limited by a sliderheostat RW2, and the other circuit is processed by a logarithmic circuit composed of an operational amplifier AR4 and a triode Q1, and a transistor Q2 feeds back signals at the emitter, thereby obtaining the effects of adjusting signal amplitudes and feeding back stable signals. The comparative regulated output circuit receives output signals of the logarithmic differential feedback circuit, andoutputs the signals after designing that the LC circuit composed of an inductor L2 and a capacitor C1is filtered. That is, in the signal transmission channel in the control device of the input electronic product, the easily unstable signals in the signal transmission channel of the control device of the low-voltage electronic product are effectively stabilized, and the anti-interference performance of the signals is improved.

The sewing machine capable of optimizing the vertical action frequency of the middle pressing foot includes one vertical actuating mechanism for the needle to move up and down, one locating mechanism for locating the sewn fabric and the needle, one middle cloth holding mechanism to make the middle pressing foot move up and down while maintaining the sewn fabric without being lifted together with the needle, and one middle pressing foot height regulating mechanism provided with driving source for regulating the height of the middle pressing foot and fitted with one action controlling mechanism for regulating the vertical amplitude of the middle pressing foot.

The invention discloses a variable excitation rolling wheel for a road roller. The wheel comprises a wheel body, a charging mechanism, buffer mechanisms, a balance mechanism and an excitation mechanism, wherein protruding blocks are arranged at the two ends of the wheel body. The charging mechanism is fixedly mounted on one side of the wheel body; the buffer mechanisms are symmetrically and fixedly installed in the wheel body. A fixed block is fixedly mounted at the output end of each buffer mechanism; a rotating shaft is fixedly mounted between the fixed blocks; one end of the rotating shaftis rotationally connected with a driving sleeve through a needle bearing; the driving sleeve is fixedly connected with the output end of a hollow shaft motor; one end of the driving sleeve is fixedlyconnected with the driving wheel; a mounting plate is fixedly mounted at one side of the driving wheel; and the excitation mechanism is fixedly mounted at the top end of the mounting plate. The variable excitation rolling wheel for the road roller has the advantages that the structure is simple, the operation is convenient and fast, the amplitude of the vibration in the equipment can be changed, the road rolling effect of the road roller is further improved, and the practicability is higher.

The invention relates to a corrugated cardboard cutting production line, which comprises a base and two symmetrically arranged support frames vertically fixed on the upper end surface of the base. The positioning plate of the cutting assembly, the support frame is provided with a discharge port, the cutting assembly includes two cantilever brackets arranged on the lower surface of the positioning plate and a motor arranged on one of the cantilever brackets, the motor shaft of the motor The driving wheel is set on the top, and the driven wheel is set on the other cantilever bracket. The driving wheel and the driven wheel are connected by a belt transmission. The belt is equipped with a cutting knife assembly that can cut corrugated cardboard. components. During daily use, the position of the base can be adjusted through the lifting and moving components, which is convenient to use.