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The invention discloses an oil fume guide type range hood which comprises a draught fan hood and a fume collecting hood. A draught fan is arranged inside the draught fan hood. A fume baffle is arranged on the upper portion of the front side of the fume collecting hood. The oil fume guide type range hood is characterized in that a fume guide plate is arranged on the rear side of the fume baffle; the space between the fume guide plate and the fume baffle forms a fume guide cavity; the space between the fume guide plate and the fume collecting hood forms a fume collecting cavity; further, clearances are reserved between at least two lateral sides of the fume guide plate and the position, corresponding to the fume collecting hood, of the shell, so that the fume guide cavity communicates with the fume collecting cavity; and the range hood further comprises an air blowing guide device which comprises air blowing ports, the air blowing ports are used for blowing out airflow which is close to the fume guide plate and flows obliquely upwards and towards the middle, and the air blowing ports are formed in the two sides of the front portion of the fume collecting hood correspondingly and close to the bottom of the fume collecting hood.

The invention relates to the field of 5G signal radio frequency technology, and discloses a 5G radio frequency signal stability detection device, in which an auxiliary rod is movably connected to the inner side of the driving part. The 5G radio frequency signal stability detection device interacts with the signal receiver through the stable seat when the screw rotates counterclockwise, and the signal receiver is subjected to a resisting force to form an upward and downward movement trend. The information is received, and the signal antenna is unfolded by the linkage of the signal receiver to increase the speed of receiving signals. The upper end of the main shaft is subjected to strong vibration force to push the unfolding part to run. The force is diffused to both ends, and the extended parts that have been attenuated during the signal propagation process are re-deployed, which achieves the effect of information stability detection, and also provides convenience for high-speed operation, which is more conducive to the transmission of network signals and ensures the commercial use of 5G networks. Maximize value.

The invention provides a light-emitting diode epitaxy structure with a hole energy adjustment layer, and relates to a semiconductor device which has at least one potential jump barrier or surface barrier and is especially suitable for light emission. A P-type semiconductor material hole energy adjustment layer with a low barrier layer is inserted into a P-type semiconductor material transport layer of the LED epitaxy structure; the material is Al<x1>In<y1>Ga<1-x1-y1>N; in the formula, x1 is smaller than or equal to 1 and greater than or equal to 0; y1 is smaller than or equal to 1 and greater than or equal to 0; 1-x1-y1 is greater than or equal to 0; the thickness is 1-300nm; the lattice constant of the hole energy adjustment layer is greater than those of a P-type semiconductor material transport layer I and a P-type semiconductor material transport layer II; and the forbidden bandwidth is smaller than those of the P-type semiconductor material transport layer I and the P-type semiconductor material transport layer II. The hole energy is increased by a polarization electric field to improve the hole injection efficiency; a hole barrier is not increased; and the defects of low hole injection efficiency and low internal quantum efficiency in the prior art are overcome.

The invention relates to a servo double-arm clamping type bag feeding manipulator with slotting tools. In the servo double-arm clamping type bag feeding manipulator with the slotting tools, a driving shaft is rotatably arranged on a left base frame and a right base frame; the driving shaft is connected with an output shaft of a servo motor through a shaft coupling; a left-side bag feeding arm is fixed on the left end part of a connecting rod; a left-side gearwheel and a left-side pinion are rotatably arranged on the end part of the left-side bag feeding arm; a left-side gearwheel clamp is fixed on the left-side gearwheel; a left-side pinion clamp is fixed on the left-side pinion; a right-side bag feeding arm is fixed on the right end part of the driving shaft; a right-side bag feeding armis fixed on the right end part of the connecting rod; a right-side gearwheel and a right-side pinion are arranged on the end part of the right-side bag feeding arm; a right-side gearwheel clamp is arranged on the right-side gearwheel; a right-side pinion clamp is arranged on the right-side pinion; a mounting frame is arranged in the middle segment of the driving shaft; a slotting tool shaft is arranged on the front end part of the mounting frame; and a left slotting tool and a right slotting tool are fixed on the slotting tool shaft. The servo double-arm clamping type bag feeding manipulator with the slotting tools solves the problems of fast bag feeding and shock vibration and shortens the switching time of a full bag and an empty bag so as to increase the packaging speed.

The invention discloses a desktop computer case, which comprises a case, a fan group, a detection device and a refrigeration device, wherein the case is a rectangular case body which comprises a front plate, a rear plate, a top plate, a bottom plate and one pair of side plates; the front plate is provided with a plurality of first air holes; the fan group, a dust screen, a splitter plate, a mainboard fixing plate and one pair of flow baffles are successively arranged in the case; the fan group comprises a first fan and a second fan; airflow blown from the fan group passes through the splitter plate via the dust screen to cool a mainboard fixed on the mainboard fixing plate, passes through a gap between the mainboard fixing plate and the bottom plate, passes through the gap between one pair of baffles and is discharged from the front plate; the detection device comprises a temperature sensor, a moisture sensor, a first single chip microcomputer and a second single chip microcomputer; and the refrigeration device comprises a low-temperature cold air device and one pair of gas pipelines, wherein the low-temperature cold air device is electrically connected with the first single chip microcomputer. The desktop computer case can quickly and intelligently cool the mainboard of the computer and is especially suitable for cooling the mainboard of a mainframe computer.