5results about How to "Avoid experimental error" patented technology

The utility model relates to the technical field of physical experiment teaching aids, in particular to a simple harmonic motion experiment instrument, which comprises a base, a liquid spraying device, a support arranged on the base and a paper feeding device arranged on the base, the support comprises a cross rod, a first vertical rod and a second vertical rod, the first vertical rod and the second vertical rod are arranged on two opposite sides of the cross rod, and the cross rod is provided with a cycloid and connected with a pendulum ball. A gap exists between the lowest point of the swing ball in the natural state and the base, a spring is fixed to the first vertical rod and is horizontally placed in the natural state, one end of the spring is detachably connected with the swing ball, the liquid spraying device comprises a spraying pipe, and the liquid outlet end of the spraying pipe is fixedly connected with the swing ball; a spring oscillator experiment and a simple pendulum experiment are integrated on one device, so that students can conveniently compare two simple harmonic motion phenomena on the same platform, the essence and generality of the simple harmonic motion can be deeply understood, and the teaching effect is optimized. Meanwhile, through the detachable connection design, quick switching between a spring oscillator experiment and a simple pendulum experiment is facilitated, and different experiment requirements are met.

This utility model provides a testing device for compressors, relating to the field of compressor testing technology. The testing device includes: a base; a connecting assembly connected to the base, the connecting assembly being movably disposed relative to the base along a preset direction, the connecting assembly having multiple working positions, and the connecting assembly being used to connect to the compressor to be tested; and a locking assembly connected to the connecting assembly, the locking assembly having a locking position for locking the connecting assembly and a releasing position for releasing the connecting assembly. When the connecting assembly moves relative to the base along the preset direction to each working position, the locking assembly is in the locking position, adapting to the precise installation and adjustment of the compressor to be tested under different testing requirements, thus solving the problem of inconvenient position adjustment and fixation of electric air compressors in the prior art.

The utility model belongs to the technical field of batteries, and discloses a combined mask plate, coating equipment and a solar cell module, the combined mask plate comprises a first separator, a second separator and a frame, the first separator has different lengths, the second separator has different lengths and is provided with a through structure, and the frame is provided with a through hole. The frame comprises a first fence plate and a second fence plate, a first inserting structure is arranged on the first fence plate, and a second inserting structure is arranged on the second fence plate. By adjusting the number and the length of the first partition pieces and the second partition pieces arranged in the frame, various containing spaces with different sizes are formed in the frame so as to adapt to products with different specifications and sizes in the same batch to be subjected to a sputtering or evaporation process, the universality is high, the production cost is reduced, and the production efficiency is improved. Experiment errors caused in the multi-batch test process are avoided, and the obtained experiment result is more accurate.

The utility model relates to a kind of multifunctional paraffin prevention experimental device, including base, outer tube, limiting cylinder, wax pipe, temperature sensor and motor;The wax pipe is placed in limiting cylinder, and the outer tube bottom end is fixed on base, multiple limiting cylinders are set in outer tube inside at equal intervals, temperature sensor and heating coil are installed in each limiting cylinder, the temperature sensor is embedded on the limiting cylinder inner wall, and the heating coil is evenly arranged on the limiting cylinder inner wall;Rotary piece is provided at the bottom of limiting cylinder, and the motor is set in the base inside below rotary piece, and the transmission shaft of motor is fixedly connected with rotary piece.The utility model relates to multifunctional paraffin prevention experimental device can be used for exhibition wax influencing factor analysis and paraffin prevention experiment.

This utility model relates to the field of anchor mechanical performance testing technology, and more particularly to a mechanical performance testing device, including a gantry frame and a base. The gantry frame is fixed on the base, and a pull-out hydraulic cylinder is installed on its top. A square enclosure is fixed on the base directly below the gantry frame. The lower end of the pull-out hydraulic cylinder is a telescopic end, on which a tension sensor is installed. An anchor clamp for holding the anchor rod is connected to the lower side of the tension sensor. Pressure-applying hydraulic cylinders are installed on the four sides of the enclosure. The telescopic end of the pressure-applying hydraulic cylinder is located inside the enclosure, and a pressure plate is provided on it. A serpentine electric heater is embedded on the side of the pressure plate opposite to the pressure-applying hydraulic cylinder. This utility model can accurately test the anchoring performance of anchor rods under high temperature and high pressure environments. By working in concert with the pull-out hydraulic cylinder and the pressure-applying hydraulic cylinder, a multi-dimensional stress environment simulation is achieved. The electric heater and sensor ensure the authenticity of the test conditions and the accuracy of the data.