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35results about How to "Easy and accurate setting" patented technology

Circular saw with improved cutting depth adjustment

A circular saw (1) includes a base (2) and a main body (3) mounted on the base and provided with an upper blade guard (7). Disposed behind the upper blade guard (7) is a stopper (22) which includes an upper curved portion (23) and an lower portion (24) coupled to the curved portion (23). One end of the lower portion (24) is attached to the main body (3) with a pivot screw (25) behind the blade guard (7) so as to permit the stopper to pivot on the screw (25) in parallel with a circular blade (5). Additionally, the curved portion (23) includes an arcuate guide slot (26). The stopper (22) further includes a fixing bolt (27) screwed in a boss (29) formed on the rear surface of the blade guard. The bolt (27) includes a lever (30) to be manually operated to selectively secure the curved portion to the bolt and release the curved portion therefrom. When the curved portion (23) is released, its pivotal position relative to the main body towards the base can be manually changed. Provided on the base is a projection (32) which is abutted by the stopper (22) when the main body (3) is lowered toward the base (2). When the curved portion (23) abuts the projection's upper surface (33), the amount of the blade (5) projecting below the base (i.e., the depth of cut) corresponds to the aforementioned relative position of the curved portion (23) with respect to the base (2).
Owner:MAKITA CORP

High-precision digital phase measurement method based on quadrature phase demodulation technology

InactiveCN108535544AThe principle of the method is simpleSimple and convenient program implementationVoltage-current phase angleLinear driftPhase unwrapping
The present invention discloses a high-precision digital phase measurement method based on a quadrature phase demodulation technology. The method comprises the following steps of: (1) performing datasampling of signals to be measured to obtain digital signals; (2) constructing first reference signals and second signals according to the digital signals, and respectively multiplying by digital signals, performing filtering of the signals after multiplying to allow the signals to only retain difference frequency items, and dividing the two signals after filtering, performing solution of an arc tangent or arc cotangent to obtain phase values of the signals after division; and performing phase unwrapping and removal of linear drift to obtain phase data of the signals to be measured. The wholeflow arrangement, the key steps and the concrete processing process of the measurement method are improved to achieve a high-precision digital measurement method with more convenient parameter regulation and simpler implementation of the phase measurement principle and system and a corresponding system so as to effectively solve the phase measurement precision problem in the scientific research such as precision measurement.
Owner:HUAZHONG UNIV OF SCI & TECH

Cycle testing device and testing method for motor positive and negative rotation power module

The invention provides a cycle testing device and a testing method for a motor positive and negative rotation power module. The testing device comprises a testing power source input module, a voltage reducing, rectification and voltage stabilization module, a peripheral interface controller (PIC), and a signal switching control module, wherein the voltage of the power source input module provides working voltage for the PIC and the signal switching control module after the voltage reducing, rectification and voltage stabilization module, the PIC is connected with the signal switching control module which is connected with the motor positive and negative rotation power module to be tested, and the PIC is utilized to control the regular switch of motor positive and negative input signals. According to the cycle testing device and the testing method for the motor positive and negative rotation power module, the testing process is automatic without manual operation to switch testing input signals; the cycle testing mode can be programmed, and the working mode is set by key pressing, the testing requirements of different motor loads are more adapted; and a liquid crystal display (LCD) can be used to display the working mode so that accurate and convenient setting of working mode and modularization of testing mode are facilitated.
Owner:殷晨钟

Spatial positioning device based on local coordinate system and system and method thereof

The invention relates to a spatial positioning device based on a local coordinate system and a system and a method thereof. The device comprises a shell. The surface of the shell is provided with key units and a display unit. A range finding calibrated scale is marked on the surface of the shell. The shell is internally provided with an ultrasonic transmitter, an ultrasonic receiver, a master controller, a wireless transceiver and a battery pack. The key units, the display unit, the ultrasonic transmitter, the ultrasonic receiver and the wireless transceiver are electrically connected with the master controller. The ultrasonic transmitter, the ultrasonic receiver, the master controller and the wireless transceiver are connected with the battery pack. According to the spatial positioning device based on the local coordinate system and the system and the method thereof, range finding is performed through the ultrasonic receiver and the ultrasonic transmitter so that indoor accurate positioning can be realized, the coordinate orientation of any one point in local space can be directly displayed, the size is small, carrying is convenient, operation is convenient and measurement accuracy is high, and thus the spatial positioning device based on the local coordinate system and the system and the method thereof are quite suitable for accurate positioning in local space.
Owner:WUHAN UNIV OF SCI & TECH

High voltage electrostatic generator

The invention discloses a high voltage electrostatic generator. The high voltage electrostatic generator is characterized in that the generator comprises a power control circuit, a single chip microcomputer system, a power amplification circuit, a boosting transformer, a voltage doubling rectification circuit and an output feedback device; the single chip microcomputer system comprises a single chip microcomputer, a keyboard, a digital display and an alarm; after a high-frequency voltage generated by the single chip microcomputer system is amplified by the power amplification circuit and boosted by the boosting transformer, a high direct voltage of 0-200 KV is output through the voltage doubling rectification circuit, and the output voltage is sent to the single chip microcomputer system through the output feedback device. The high voltage electrostatic generator has the advantages of being simple in circuit, convenient to use and maintain, stable in performance, capable of enabling parameters to be set conveniently, continuous and adjustable in voltage, capable of achieving an overload alarm function and a protection function, and suitable for environment-friendly dust removing, electrostatic spraying, electrostatic seed treatment, electrostatic flocking and the like.
Owner:NANJING COLLEGE OF CHEM TECH
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