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The utility model discloses a naphthalene water reducer neutralization reaction device capable of automatically adding alkali, and belongs to the technical field of water reducer production equipment. The naphthalene water reducer neutralization reaction device with the automatic alkali adding function comprises a reaction tank, a tank cover is installed at the top end of the reaction tank, four supporting columns are installed on the outer side of the bottom end of the reaction tank, a cooling mechanism is installed on the outer side of the reaction tank, an alkali liquor tank is arranged on one side of the reaction tank, a ring pipe is installed on the inner side of the reaction tank, and a plurality of alkali liquor spray heads are installed at the bottom end of the ring pipe. The top end of the alkali liquor tank is provided with a liquor feeding mechanism for supplying liquor to the annular pipe, the top end of the annular pipe is provided with a cleaning mechanism for cleaning the alkali liquor spray head, the reaction tank is internally provided with a mixing mechanism, the bottom end of the reaction tank is provided with a liquor outlet pipe, and one end of the liquor outlet pipe is provided with a valve. The neutralization reaction efficiency is improved, and the practical value is relatively high.

This invention relates to the field of crusher technology, specifically to a metal scrap anti-jamming crusher, comprising two crushing rollers. Each crushing roller is equipped with: crushing rings, multiple of which are evenly arranged along the axis of the crushing roller, with crushing gaps between adjacent crushing rings; the crushing rings on adjacent crushing rollers are staggered and interlocked into the crushing gaps on the other crushing roller to form intersecting areas; first crushing teeth, evenly distributed around the periphery of the crushing rings along their axis; a telescopic groove, which sequentially penetrates the crushing roller and the crushing rings along the radial direction of the crushing roller; second crushing teeth, movable within the telescopic groove along its extension direction; and a second driving device, disposed within the crushing roller and used to drive the movement of the second crushing teeth. This invention avoids material jamming or metal scrap getting stuck during the crushing process.

This utility model belongs to the technical field of expansion joint construction equipment, specifically relating to an expansion joint construction device, including a base, a movable component disposed on the surface of the base, and a cleaning component. The surface of the base has a notch for placing the cleaning component. The cleaning component includes a cleaning disc vertically placed in the notch, a bracket for driving the vertical movement of the cleaning disc, and a driving component fixed on the surface of the bracket for driving the rotation of the cleaning disc. The outer surface of the cleaning disc is smooth, and the outer surface of the cleaning disc has multiple placement grooves circumferentially spaced around its axis. Each placement groove has a movable block, and one side surface of the movable block is covered with bristles. The outer surface of each movable block away from the axis of the cleaning disc is arc-shaped, and the end of each movable block near the axis of the cleaning disc is elastically hinged to the surface of the cleaning disc. By adopting the technical solution of this utility model, the problem of the cleaning disc not being well protected during the current expansion joint cleaning can be effectively solved.