64results about How to "Large pressure adjustment range" patented technology

The invention discloses a three-stage pressure regulating double-coil type magneto-rheological valve which is composed of an end cover, a valve core, a valve body, a positioning block, a guide block, a positioning pin, a coil I, a coil II, a sealing ring, a screw and the like. When current with certain direction and size is input into the coil I and the coil II, a magnetic field can be generated in three damping gaps formed by the valve core and the valve body; and the direction of the magnetic field is vertical to the direction of a flowing direction of magneto-rheological liquid. When the magneto-rheological liquid flows into the damping gaps of the magneto-rheological valve, the magneto-rheological liquid is rapidly changed into a semi-solid state under the effect of the magnetic field; the viscosity of the magneto-rheological liquid is rapidly increased along the magnetic induction strength so as to cause that a pressure difference between two ends of the damping gaps to be increased; and therefore, the flowing of the magneto-rheological liquid is slowed or stopped. The pressure difference between the two ends of the damping gaps is controlled through controlling the size and the direction of the current input into the two coils, so as to form three-stage pressure regulation and control a pressure difference between an inlet and an outlet of the magneto-rheological valve. The magneto-rheological valve is applicable to a multi-stage low-pressure small-flow hydraulic control system with an adjustable pressure.

The invention discloses a damping-clearance mechanical adjustable double-coil magnetorheological valve which comprises an end cover, a spool, a valve block, a reel, a self-locking nut, a coil I, a coil II, a seal ring, a screw and the like. When the spool rotates to a proper position and inputs current of certain direction and certain magnitude to the coil I and the coil II, magnetic field generates in three conical damping clearances formed by the spool and the reel, and the direction of the magnetic field is substantially perpendicular to the flow direction of magnetorheological fluid. When flowing into the conical damping clearances, the magnetorheological fluid is semi-solidified fast under the action of the magnetic field, the viscosity increases fast and increases with increase of magnetic induction intensity, pressure difference between two ends of the damping clearances is caused to increase and accordingly flowing of the magnetorheological fluid can be slowed down or prevented. High pressure difference between an inlet and an outlet of the magnetorheological valve can be obtained by controlling the operating position of the spool and the magnitude and direction of the current input to the two coils. The damping-clearance mechanical adjustable double-coil magnetorheological valve is applicable to hydraulic servo control systems with wide pressure adjustment range.

This invention discloses an apparatus for measuring the lubrication of axial plunger pump auxiliary. Its hydraulic power system is composed of main oil line and loading oil line, wherein main oil line serves to provide hydraulic oil to test bench of lubricant film, and loading oil line serves to provide relevant pressing force to auxiliary to balance hydraulic backward thrust from seal band; test bench of lubricant film is to test auxiliary lubrication under various working situations; monitoring and controlling system is to monitor the experiment status in real time and to collect multiple working parameters during the experiment to accomplish the analysis and process of the datum in measuring experiment. Computer is employed to accomplish the on-line monitoring of various working situations to ensure high safety and stability.

The invention relates to a vibroflot for compacting soft foundation by a vibroflotation method. The dry-process vibroflot comprises a vibroflotation head, a body and a motor gland, wherein the top of the body is connected with the vibroflotation head, while the tail is connected with the motor gland; an air-water channel, a water outlet channel and a water return channel are formed in the body; the motor gland is provided with an air inlet, a water inlet and a water return hole; the vibroflotation head is provided with a water outlet; the air-water channel is connected with an airinlet; the water outlet channel is connected with the water outlet; and the water return channel is connected with the water return hole. High pressure air is sprayed through the air-water channel, the water and air are mixed to impact the ground, and the pore forming rate is higher; the water outlet channel and the water inlet channel are self-circulated under certain pressure and water resources are saved; and water or air can pass through the air-water channel, so that a range of regulating the ground impacting pressure of the vibroflot is wider.