43results about How to "Avoid pressure instability" patented technology

The invention provides a steel pressing rod with restorable prestress restrained by a clamping hoop type circular tube. The steel pressing rod includes a circular pressing tube, an upper semicircle restraint tube, a lower semicircle restraint tube, clamping hoops, first stiffening lug plates, second stiffening lug plates, a pretension rod, upper sealing plates and lower sealing plates, the upper semicircle restraint tube sleeves the upper semicircle of the outer side of one section of the circular pressing tube, the lower semicircle restraint tube sleeves the lower semicircle of the circular pressing tube of the corresponding section, the upper sealing plates are respectively welded to both ends of the upper semicircle restraint tube, the lower sealing plates are respectively welded to both ends of the lower semicircle restraint tube, the symmetrical first stiffening lug plates are welded to one end of the upper semicircle restraint tube, the upper sealing plate at the other end of the upper semicircle restraint tube is welded to the corresponding end of the circular pressing tube, the two symmetrical second stiffening lug plates are welded to the other end of the lower semicircle restraint tube, the lower sealing plate at one end of the lower semicircle restraint tube is welded to the corresponding end of the circular pressing tube, both ends of two pre-pull rods are respectively anchored between the first stiffening lug plates and the second stiffening lug plates, and the multiple clamping hoops are fixed to the outer sides of the upper semicircle restraint tube and the lower semicircle restraint tube.

The invention discloses a pressure-stabilizing non-negative pressure water supply system, which comprises a water inlet pipe, a water inlet pipe voltage stabilizing device, a water supply power combination device and a water supply pipe. , after the water inlet pipe is processed and pressurized by the water supply power combination equipment, it is supplied to each user; the water inlet pipe pressure stabilization equipment includes a high-level water tank, a hydraulic cylinder and a pressurized cylinder. The high-level water tank is connected with the water inlet pipe through an L-shaped pipe. A replenishment valve is provided, and the bottom of the high-level water tank communicates with the pressurized cylinder through a folded pipe. The folded pipe is provided with a first electromagnetic control valve and a third check valve, and a liquid level sensor is built in the high-level water tank; the output shaft of the hydraulic cylinder It is fixedly connected with the piston in the pressurized cylinder, and the bottom end of the pressurized cylinder communicates with the water inlet pipe through the pressurized tube, and the second electromagnetic control valve and the fourth check valve are arranged on the pressurized tube.

The invention provides a feeding system for optical fiber preform production. The feeding system comprises a gas-liquid mixing part, an ultrasonic atomizing part, a heating part, a torch lamp and a torch lamp position adjusting platform, wherein the gas-liquid mixing part comprises a liquid material charge pipe, a gas carrying charge pipe, a liquid flowmeter and a gas flowmeter; the ultrasonic atomizing part comprises an atomizing part charge pipe and an ultrasonic generator for atomizing a gas-liquid mixture in the atomizing part charge pipe; the atomizing part charge pipe is communicated with a middle conveying charge pipe which is communicated with both the liquid material charge pipe and the gas carrying charge pipe; the heating part comprises a heater used for evaporating the atomized gas-liquid mixture into mixed gas; the atomized gas-liquid mixture is conveyed to the heater through a heating part charge pipe communicated with the atomize part charge pipe; the torch lamp is used for conducting sedimentation of the mixed gas on an optical fiber preform; the mixed gas is conveyed to the torch lamp through a final charge pipe communicated with the heating part charge pipe; the torch lamp position adjusting platform is used for bearing the ultrasonic atomize part, the heating part and the torch lamp. The feeding system has the advantages that the vapor conveying pipeline is short; the evaporation pressure is stable; the leakage possibility is low; the position of the torch lamp is convenient to adjust.

The invention discloses a reinforcement method for a brick lining in a strongly corrosive environment, comprising the following steps: S1) pulling out the brick lining at the reinforcement point out of the cavity; excavating a grouting groove downward on the surface of the lining matrix, Bolt holes are opened downward at the center of the center of the bolt; S2) Put the lower end of the bolt into the bolt hole, inject the grout into the grout groove, and then insert the embedded part from the upper end of the bolt; S3) Put the embedded part on the flat plate The surface is attached to the lining board, and the outer periphery of the lining board is overlapped with the inner lining board of the brick lining; S4) Install a rubber ring in the U-shaped groove in the middle of the embedded part and fill it with soft cement, and press the first compression nut Put the rubber ring and soft cement down from the upper end of the bolt; S5) cover the reinforcement plate on the top surface of the cavity, and insert the second compression nut from the upper end of the bolt to compress the reinforcement plate downward. The method of the invention is simple, the engineering quantity is small, the cost is low, the construction period is short, the abrasion resistance and the sealing performance are good, and the pressure instability of the brick lining can be effectively avoided.

The invention discloses a high-accuracy, large-stroke three-degree of freedom parallel micro positioning platform. The platform comprises a base body; a movable platform is formed at the center of the base body; four flexible bridge amplifying mechanisms are evenly arranged around the movable platform; any flexible bridge amplifying mechanism arranged along an X direction is driven by a piezoelectric ceramic driver I; two flexible bridge amplifying mechanisms arranged along a Y direction are respectively driven by one piezoelectric ceramic driver II; two flexible bridge amplifying mechanisms arranged along the X direction are connected with the movable platform through two semicircular flexible hinges I which are connected in series in the X direction respectively; and the two flexible bridge amplifying mechanisms arranged along the Y direction are connected with the movable platform through one group of semicircular flexible hinges II respectively, wherein each group of semicircular flexible hinges I includes two semicircular flexible hinges II which are connected in series and are parallel to the Y direction; and the two groups of semicircular flexible hinges II are in central symmetry. The high-accuracy, large-stroke three-degree of freedom parallel micro positioning platform of the invention can realize high-accuracy and large-stroke movement in an XY plane, has high working bandwidth and natural frequency.

The invention discloses a device for pressing a puncture site after cerebrovascular intervention. The main point of the technical solution is to include a pressing part and a fixing device. The pressing part includes a pressing shell and an elastic pressing pad. To fill the inner cavity, the outside of the pressing shell is provided with a first filler, the pressing shell is provided with a pressure gauge, the pressing shell is slidably connected with a blocking plate, the pressing shell is provided with a limiting structure, and the first filling device includes a first filler Airbag, the two sides of the first filled airbag are provided with an inlet through hole and an outlet through hole, a first one-way valve is installed on the inlet through hole, a second one-way valve is installed on the outlet through hole, and the outlet of the second one-way valve The first connecting pipe communicates with the first filling cavity, the pressing shell is provided with a first discharge channel, and the first discharge channel is provided with a control valve, which can control the pressing range, adjust the pressing position, and control the pressing force, which is convenient Cold compress or hot compress operation reduces the workload of staff.

The invention provides a steel pressing rod with restorable prestress restrained by a clamping hoop type circular tube. The steel pressing rod includes a circular pressing tube, an upper semicircle restraint tube, a lower semicircle restraint tube, clamping hoops, first stiffening lug plates, second stiffening lug plates, a pretension rod, upper sealing plates and lower sealing plates, the upper semicircle restraint tube sleeves the upper semicircle of the outer side of one section of the circular pressing tube, the lower semicircle restraint tube sleeves the lower semicircle of the circular pressing tube of the corresponding section, the upper sealing plates are respectively welded to both ends of the upper semicircle restraint tube, the lower sealing plates are respectively welded to both ends of the lower semicircle restraint tube, the symmetrical first stiffening lug plates are welded to one end of the upper semicircle restraint tube, the upper sealing plate at the other end of the upper semicircle restraint tube is welded to the corresponding end of the circular pressing tube, the two symmetrical second stiffening lug plates are welded to the other end of the lower semicircle restraint tube, the lower sealing plate at one end of the lower semicircle restraint tube is welded to the corresponding end of the circular pressing tube, both ends of two pre-pull rods are respectively anchored between the first stiffening lug plates and the second stiffening lug plates, and the multiple clamping hoops are fixed to the outer sides of the upper semicircle restraint tube and the lower semicircle restraint tube.

The invention discloses a proportional metering oil needle for load pressure displacement feedback, which adopts a double-movable cylinder body of a valve sleeve and a valve core and a hollow oil needle structure with a constraint spring, and adapts the load fluctuation by designing the spring stiffness to make the metering oil needle output The flow rate is basically constant, and only the external mechanism controls the displacement of the valve sleeve body to achieve the purpose of flow ratio adjustment. The spring seat of the metering oil needle is rigidly connected with the outer cylinder, the adjusting bolt can adjust the spring preload, and the oil needle is supported by the spring. The external drive mechanism adjusts the position of the inner cylinder to control the opening of the oil needle. When the position of the inner cylinder remains unchanged, the oil needle changes the expansion and contraction amount through the spring to balance the load pressure, so that the metering oil needle moves in a small range to realize the fine adjustment of its opening. The spring stiffness is designed according to the flow equation, so that the change of the opening offsets the change of the flow area caused by the pressure difference fluctuation. The invention realizes the accurate proportional control of the flow rate, and simultaneously simplifies the structure of the metering device containing the oil needle, and has great practical value.