30results about How to "Solving fixed difficulties" patented technology

The invention discloses a system and a method for a time domain and a rotation angle domain of an in-cylinder pressure signal of an internal combustion engine, a cylinder pressure measurement device and a pulse signal measurement device. The cylinder pressure measurement device and the pulse signal measurement device measure the collected in-cylinder pressure signal and the The pulse signal corresponding to the flywheel ring gear is transmitted to the internal clock acquisition system, and the internal clock acquisition system further transmits the received data to the processor for processing; the precise zero-crossing point of the pulse signal is determined by an interpolation algorithm, and on this basis, the in-cylinder The pressure signal is converted from the time domain to the angle domain; this method effectively avoids the problem of false triggering due to the loss or interference of the encoder signal in the traditional test method, and effectively improves the reliability of the data acquisition process.

The invention discloses a reusable overhanging type steel fixing bolt and protecting sleeve and a construction process thereof. The reusable overhanging type steel fixing bolt and protecting sleeve and the construction process thereof aim to solve the problem that a U-shaped bolt for fixing overhanging type steel is difficult to fix, reduce the embedded mounting difficulty of the U-shaped bolt andreinforce the thread protection of the U-shaped bolt, thereby laying a foundation for repeated application of the U-shaped bolt, and the universality of green construction is fully reflected.

The invention provides a preparation method for an aluminum bronze composite casting valve plate. The preparation method comprises the following steps that 1 precoated sand is fetched and injected into a valve plate die cavity, heat preservation is conducted so that the precoated sand is solidified and formed, drawing is conducted, and a shell mould of the precoated sand is acquired; 2 a copper bush is fixed to an inner core of the shell mould of the precoated sand, then mould assembling is conducted, and the copper bush is vertically clamped to form a pouring cavity; the component of the copper bush is aluminum bronze; 3 iron liquid is acquired, then the iron liquid is poured into the pouring cavity, and a casting piece is acquired; 4 the casting piece is fetched and cooled, shot blasting and finishing are conducted, and a precoated sand shell-shaped composite casting valve plate is acquired. The yield of the composite casting piece can reach over 96% through the adoption of the preparation technology of the aluminum bronze composite casting valve plate, and the preparation technology of the aluminum bronze composite casting valve plate solves the long-existing technical problem puzzling the mass production in the prior art.

The embodiment of the invention discloses an electro-hydraulic control pressure shutoff system used for a hydraulic support vertical column. The electro-hydraulic control pressure shutoff system comprises a liquid inlet main pipeline, a liquid returning main pipeline, a pressurizer, two hydraulic control one-way valves, two hydraulic control two-position three-way reversing valves and two electromagnetic reversing valves. The liquid inlet main pipeline comprises a first branch and a second branch; the liquid returning main pipeline comprises a third branch and a fourth branch; the first branch is connected with inlets of the two electromagnetic reversing valves; emittings of the two electromagnetic reversing valves are connected with control openings of the two hydraulic control two-position three-way reversing valves; oil returning openings of the two electromagnetic reversing valves are connected with the third branch; the second branch is connected with inlets of the two hydraulic control two-position three-way reversing valves; oil returning openings of the two hydraulic control two-position three-way reversing valves are connected with the fourth branch; and an emitting of the pressurizer used for being connected with an annular cavity. The embodiment of the invention discloses an electro-hydraulic control pressure shutoff method used for the hydraulic support vertical column. By utilizing the electro-hydraulic control pressure shutoff system and method used for the hydraulic support vertical column, the disassembling efficiency of a middle cylinder guide sleeve can be improved.

The invention relates to a positioning device for an embedded steel plate. The positioning device is used for fixing the steel plate to a to-be-formed concrete structure, and a plurality of fixing ribs are fixedly arranged on one side of the steel plate at intervals. The positioning device comprises a base, a telescopic part and a clamp, wherein the telescopic part is vertically fixed to the baseand can be adjusted in a lifting mode, and the clamp is fixedly installed on the side portion of the telescopic part and matched with the steel plate; and the steel plate is clamped through the clamp,the fixing ribs face the side away from the telescopic part, and then the telescopic part is adjusted to drive the steel plate to ascend to the to-be-formed concrete structure. The problem that the steel plate is difficult to fix is effectively solved, the steel plate does not need to be welded to steel bars in the concrete structure, and the steel plate can be positioned through the positioningdevice; and deviation of the steel plate can be avoided during concrete pouring, the embedding precision of the steel plate is guaranteed, and a good foundation is laid for subsequent construction.