44results about How to "Solve tough problems" patented technology

The invention discloses a device for improving the multi-effect evaporative concentration capacity. A multi-effect heating evaporation mechanism includes a single-effect heating evaporation assembly,a double-effect heating evaporation assembly and a triple-effect evaporation assembly; the single-effect heating evaporation assembly includes a single-effect heater and a single-effect separation chamber, the double-effect heating evaporation assembly includes a double-effect heater and a double-effect separation chamber, the triple-effect evaporation assembly includes a triple-effect heater anda triple-effect separation chamber, the single-effect heater, the double-effect heater and the triple-effect heater are sequentially connected in series through a downstream pipeline, the single-effect separation chamber is respectively connected with the top and the bottom of the single-effect heater, the double-effect separation chamber is respectively connected with the top and the bottom of the double-effect heater, and the triple-effect separation chamber is respectively connected with the top and the bottom of the triple-effect heater; each of the single-effect heating evaporation assembly and the double-effect heating evaporation assembly also includes a steam tube capable of generating steam; the steam tubes are respectively correspondingly connected with the single-effect heater and the double-effect heater; and the device also includes a secondary steam tube, and the double-effect separation chamber is connected to with the triple-effect heater through the secondary steam tube.

The invention relates to a die for punching of a side edge of a product with a U-shaped section, comprising a male die, a female die and a lower die plate, wherein a lower die is arranged at the upper end of the lower die plate, a sliding block is arranged at one side of the lower die, the female die is arranged at the upper end of the lower die, a through hole is vertically formed in one end of the female die, the other end of the female die stretches into the side wall of the sliding block to be fixed, the lower die plate is connected with the sliding block by a round-wire spiral spring, the sliding block and the lower die are connected with a fixed plate arranged above the female die by an unloading guide pillar, an unloading plate capable of sliding along the unloading guide pillar is arranged between the fixed plate and the female die, the male die is arranged in the fixed plate, the lower end of the male die slides in a movable slot of the unloading plate, an upper die plate is arranged at the upper end of the fixed plate, an unloading screw is in sliding connection in the upper die plate, and the lower end of the unloading screw penetrates through the fixed plate to be connected with the unloading plate. The die can improve the production efficiency and ensure the dimension precision and surface requirements of products.

The invention discloses a construction method for treating flowing sand of a deep foundation pit slope. The essential significance of the construction method is to treat the stagnant water of the deepfoundation pit slope. Since releasable flowing can only occur to a geological sand layer with water under certain conditions inducement, the sand layer is naturally stopped if the water in the sand layer is discharged. The stagnant water in the geological sand layer is formed naturally, the conditions and reserves are both different, and the gushing potential of the flowing sand is different as well. According to the method, two measures are adopted according to the different gushing amounts, wherein the first measure is to use a reverse drainage water filtering channel and is suitable for the situation that the gushing of the flowing sand is small and slow; and the second measure is to use the reverse drainage water filtering channel and infiltrating wells, and is suitable for the case that the gushing of the flowing sand is large and the related section is long. The first measure of using the reverse drainage water filtering channel is characterized by comprising the steps of drilling a plurality of downwardly inclined water through holes in the edge of a trough at the trough slope where the flowing sand gushes, and intercepting the flowing sand water flowing into the foundationpit and draining the flowing sand into the sand layer of the next layer through filtering; and the second measure of using the reverse drainage water filtering channel and the infiltrating wells is characterized in that the water filtering channel is arranged at the trough slope and the plurality of infiltrating wells are additionally arranged at a place slightly away from the trough opening.

The invention relates to the frequency conversion speed regulation technology for a mine special battery vehicle, and particularly relates to an AC frequency conversion speed regulation method simulating series excitation DC motor soft features, so as to solve the problem that the mechanical feature curve of the existing low-voltage DC / AC frequency conversion speed regulation system is over rigid. The method is realized by adopting the following steps: 1) the input end of the AC motor and the output end of a frequency converter are connected; 2) when the AC motor is used for heavy-load starting and full-load climbing, the frequency converter adopts a torque vector control mode to control the torque of the AC motor to be maintained as the maximal torque; 3) when the AC motor is used for full-load level road driving, the frequency converter adopts a frequency given control mode to control the power of the AC motor to be the rated power; and 4) when the AC motor is used for idling driving, the frequency converter adopts a torque given control mode to control the torque of the AC motor to be maintained to be constant. The method of the invention is applied to the mine special battery vehicle.