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 discloses a power concentration and distribution device for power supply system control equipment of a space craft. The device comprises a plurality of module frameworks, a heat dissipation bottom plate, a bottom plate reinforcing rib, an upper insulating plate, a lower insulating plate and copper bus bars; the bottom of each module framework is connected with the heat dissipation bottom plate and the module frameworks are vertical to the heat dissipation bottom plate; the bottom plate reinforcing rib is fixed on the heat dissipating bottom plate inside the module frameworks; the upper insulating plate is placed on the upper surface of the bottom plate reinforcing rib and the lower insulating plate is placed on the lower surface of the bottom plate reinforcing rib; the copper bus bars are mounted on the bottom plate reinforcing rib, penetrate through the lower insulating plate, the bottom plate reinforcing rib and the upper insulating plate and are fixed; the copper bus bars are vertical to the module frameworks. The power concentration and distribution device for power supply system control equipment of a space craft, provided by the invention, overcomes such problems of a traditional power concentration and electric energy distribution form under the limitation of small size and light weight as poor maintenanceability, heavy device weight, high difficulty in lead fixing and poor heat dissipation effect.

The invention discloses a leveling device for a wind measuring instrument on a large cable of a large-span suspension bridge. The supporting steel plate is fixed on the crossbeam of the inspection road, and a platform panel for fixing the supporting rod of the wind measuring instrument is arranged above it. The supporting steel plate and the platform There is a controller and three leveling parts with the same structure between the panels; the controller receives the inclination data sent by the sensor, calculates the adjustment range of each servo motor according to the current inclination situation, and sends the adjustment command to the corresponding programmable Logic controller; the programmable logic controller turns on the servo motor, and the output end of the servo motor reducer is vertically provided with a ball screw; the matching screw nut is fixedly connected to the platform panel to drive the platform panel to lift and level. The invention can detect the inclination of the wind measuring instrument in real time, automatically adjust the angle of the instrument in time according to the inclination degree of the instrument, keep the instrument completely level, greatly reduce the workload of manual leveling, and improve the accuracy of wind measurement data.

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 pre-embedded steel plates and a construction method thereof. It is used to fix the steel plate at a concrete structure to be formed, and one side of the steel plate is fixed with several fixing ribs at intervals. The positioning device includes: a base; A telescopic piece that is vertically fixed on the base and can be adjusted up and down; and a clamp that is fixedly installed on the side of the telescopic piece and matches the steel plate, the steel plate is clamped by the clamp, and the fixing rib faces the side away from the telescopic piece, and then Adjust the telescopic member to drive the steel plate up to the concrete structure to be formed. The invention effectively solves the problem of difficult fixing of the steel plate, without welding the steel plate to the steel bars in the concrete structure, the positioning of the steel plate can be completed through the positioning device, and the deviation of the steel plate can be avoided during concrete pouring, ensuring the pre-positioning of the steel plate. The buried accuracy lays a good foundation for subsequent construction.

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.