31results about How to "Shorten vibration time" patented technology

Provided are a motor driving method, a program therefor, and a motor driving apparatus which can shorten starting time of a vibration wave motor. A driving circuit of the vibration wave motor includes a control unit. The control unit controls two-phase driving voltages applied to an electro-mechanical energy conversion element of the vibration wave motor. The control unit controls a phase difference between the two-phase driving voltages to drive a driven member at a predetermined speed in a fixed state of frequencies of the two-phase driving voltages. In this case, when the phase difference is set outside a predetermined range, the control unit changes the frequencies of the two-phase driving voltages.

The invention provides a low-noise concrete brick forming vibration forming device and a forming machine. The vibration forming device comprises a connecting piece connected to a concrete brick formwork frame for directly transmitting vibration force to the concrete brick formwork frame, and a connecting piece fixed on the connecting piece. A vibrating mechanism used to provide a vibration source on the part. The advantages of the present invention are as follows: the vibration mechanism providing the vibration source is arranged on the connecting piece, and the connecting piece is directly connected with the concrete brick formwork frame. During operation, the vibration force of the vibration mechanism is directly transmitted to the concrete brick formwork frame through the connecting piece, which greatly improves the efficiency of the present invention. Reduce the energy loss in the vibration transmission process, so that the vibration mechanism does not need to work at a higher frequency; at the same time, it avoids the separation of the traditional concrete brick formwork frame and the vibration mechanism, resulting in the high-frequency collision of the two when the concrete brick is formed. ; Can reduce the vibration noise of the vibration forming device; can improve the vibration efficiency, reduce the vibration time, help the rapid forming of concrete bricks, and achieve high-efficiency and high-yield production.

The invention discloses a damping system for a forward gantry of an electric forward forklift, which comprises an oil tank connected with an oil inlet pipe and an oil return pipe, wherein the oil inlet pipe and the oil return pipe are both connected to a multi-way control valve which is externally connected with a forward cylinder, a gear pump is in external transmission connection with an electric motor and is arranged inside the oil inlet pipe, a two-position four-way solenoid valve is arranged inside a connecting pipeline between the multi-way control valve and the forward cylinder, a travel switch in control connection with the two-position four-way solenoid valve is arranged outside a piston rod of the forward cylinder, and when the two-position four-way solenoid valve is powered on, the two interfaces of the two-position four-way solenoid valve are communicated with each other. The problems of poor stacking safety and long storage time caused by the long-time vibration of the gantry of the electric forward forklift in the forward stacking operation process are solved. According to the damping system disclosed by the invention, the gantry can be quickly stabilized from vibration so that the amplitude of vibration can be quickly attenuated in an integrated mechanical-electrical-hydraulic manner on the basis of not influencing on the normal forward stacking operation of the electric forward forklift, so that the safety and storage efficiency of the forklift are greatly improved.

The invention relates to an active vibration control method for wrinkled membranes based on in-plane regulation. The dynamic model of wrinkled membranes is established mainly by analyzing the influence of wrinkle shape on the dynamic characteristics of the membrane structure; Based on the basic space vector, the dynamic model of the wrinkled membrane under different loads is established; according to the contribution of each order mode to the vibration deformation of the system, the dynamic model is condensed to establish a control-oriented dynamic model of the membrane structure; the model is adopted Referring to the adaptive controller, combined with the PID controller, a PID-MRAC control method based on in-plane regulation and multi-model switching is proposed. The method of the present invention does not need to paste actuators on the surface of the film, and can effectively suppress the out-of-plane vibration of the film. , will not affect the characteristics of the film itself, ensure the stability of the film structure, and shorten the vibration time by about 39.7% compared with the traditional PID control method.

The invention discloses a four-shaft united excitation vibration power device. The four-shaft united excitation vibration power device comprises a box body; a first main shaft, a first driven shaft, asecond driven shaft and a second main shaft are sequentially installed in the box body side by side; a first driving gear and a second driving gear are installed on the first main shaft and the second main shaft correspondingly; a first driven gear engaged with the first driving gear and a second driven gear engaged with the second driving gear are installed on the first driven shaft and the second driven shaft correspondingly; the first main shaft and the second main shaft penetrate through the box body and are connected with a driving device; first eccentric blocks are installed on the first main shaft; and second eccentric blocks are installed on the second main shaft. According to the four-shaft united excitation vibration power device, the driving device drives the first eccentric blocks and the second eccentric blocks installed at the two ends of the first main shaft and the second main shaft to rotate to generate vibration; due to the fact that the first main shaft, the secondmain shaft, the first driven shaft and the second driven shaft are installed side by side, the contact area with a vibration table is increased, the needed vibration time is shortened, the amplitude is reduced, and the needed excitation vibration force is convenient to adjust due to the design of the eccentric blocks at the two ends.

The invention discloses an impact force testing device, which comprises an external power supply and a displaying device, wherein the external power supply is connected with the displaying device; the impact force testing device is characterized by comprising a cylinder body (2), wherein a holding cavity with a bottom and without a top is arranged in the cylinder body (2), and a rubber leather bowl (4) is arranged on the upper end of the holding cavity; a piston (5) is arranged on the rubber leather bowl (4); an upper cover (6) is arranged on the upper end of the cylinder body (2); a damping hole plate (3) is arranged in the holding cavity, and the damping hole plate (3) is used for dividing the holding cavity into a holding cavity I (21) and a holding cavity II (22) from top to bottom; and a sensor (8) is arranged on the side wall of the cylinder body (2), and the sensor (8) is connected with the external power supply and in signal connection with the displaying device.

The invention provides a concrete brick forming machine with good synchronization and low noise, comprising a synchronous pressing head mechanism for realizing synchronous pressing of bricks, a concrete brick mould frame arranged under the synchronous pressing head mechanism, and a concrete brick mould frame connected to the concrete brick mould frame. The lower end is used to transmit the vibration force directly to the vibration transmission connector of the concrete brick formwork frame, the vibration mechanism fixed on the vibration transmission connector to provide the vibration source, the concrete brick support plate set at the bottom of the concrete brick formwork frame, The vibration damping and knocking support mechanism arranged under the concrete brick support plate for supporting the concrete brick support plate and the lifting mechanism for driving the concrete brick formwork frame and the vibration transmission connecting piece to move up and down together. The advantages of the invention are: good synchronization, good brick-making effect; good vibration and compaction effect of filler, which can ensure the quality of formed concrete bricks and improve product qualification rate; low working noise of the whole machine is beneficial to protect the health of workers; High-efficiency and high-volume production can be achieved.

The invention discloses a damping material, a preparation method thereof and a piezoelectric ceramic ultrasonic probe. The damping material comprises the following components in parts by weight: 60-120 parts of high-molecular polymer, 30-60 parts of inorganic fillers with sheet structure, 5-15 parts of inorganic fillers with ball structure, 0.5-5 parts of silane auxiliaries and 10-30 parts of solvents. The damping material provided by the invention can effectively prevent the long curing time and insufficient conduction caused by the increase of tungsten powder content as well as the interference to the ultrasonic signal caused by the middle layer formed by bonding the damping block with the piezoelectric ceramic wafer of the present damping material; the curing time is stable, the material is non-conducting and the damping coefficient is higher; a filling method is applied to the piezoelectric ceramic ultrasonic probe, so that the vibration damping of the piezoelectric ceramic wafer is greatly increased; the vibration time of the piezoelectric ceramic wafer is shortened; the absorption of the piezoelectric ceramic wafer for the echo signal is benefited; the definition of ultrasonic testing for multilayer gluing structure defect is increased.