1027results about How to "Regulating pressure" patented technology

The invention discloses a full-automatic solder paste printer. The full-automatic solder paste printer comprises a rack subassembly, wherein a Z-axis lifting system is installed at the bottom end of the rack subassembly, and a platform correcting system is installed at the top end of the Z-axis lifting system and provided with a guide rail transporting system; the rack subassembly is provided with a steel screen frame clamping system, a scraper blade printing system and an automatic cleaning system; the Z-axis lifting system makes lifting movement stable and positioning fast and accurate and solves the problem that responding speed is low because large-inertia lifting control is low in positioning accuracy; the difficult problem that manual PCB correction is not accurate is solved through the platform correcting system, and printing quality is improved; a steel screen frame is cleaned in any combination mode of a drying cleaning mode, a wet cleaning mode and a vacuum cleaning mode, so that the cleaning effect of the steel screen frame is greatly improved, manual cleaning time is shortened, and labor intensity is relieved; through the scraper blade printing system, pressure of a scraper blade can be accurately controlled and regulated, and the problem that the scraper blade pressure of a traditional printer cannot be controlled is solved.

The invention discloses a hydraulic brake system and method with a double hydraulic cylinder four-wheel failure backup. The hydraulic brake system comprises a hydraulic control unit (HCU), a brake pedal, a manpower cylinder, a liquid storage tank, a stroke simulator, a main cylinder, a ball screw, a first motor, an electronic control unit (ECU), a plurality of connecting pieces, a solenoid valve, a sensor and a brake. According to the hydraulic brake system with the double hydraulic cylinder four-wheel failure backup, the idea of more reliable and safer braking and quicker and more accurate control is embodied.

The invention provides a device and a method for evaluating the sand carrying capacity of carbon dioxide dry-process fracturing fluid. The device comprises a high-pressure visual stirring vessel, a carbon dioxide pressurization system, a viscosity improving agent injecting system, a supporting agent adding system, a temperature control system and a data acquisition system, wherein the carbon dioxide pressurization system, the viscosity improving agent injecting system, the supporting agent adding system, the temperature control system and the data acquisition system are connected with the high-pressure visual stirring vessel. All constituent parts are connected with one another through a pipeline and valves to form the device for the sand carrying capacity of the carbon dioxide dry-process fracturing fluid. The device provided by the invention is used for evaluating the sand carrying capacity of the carbon dioxide dry-process fracturing fluid under different phase states (a liquid state or a supercritical state), realizes the visualization and is simple in structure and higher in measuring precision; an operation method is easy to implement; the stirring speed, the temperature and the pressure can be regulated; the quantitative measurement of the sand carrying capacity of the carbon dioxide fracturing fluid from the liquid state to the supercritical state within a greater pressure and temperature range can be realized, so that reliable sand carrying capacity data is provided for fracturing design and field test.

The invention relates to a sealing mechanism preventing gas exchange. The sealing mechanism comprises a stress block (3), a pressing block (4) and a compressing mechanism (5), wherein the stress block (3) is connected with a fixed part (1) and is in clearance fit with a rotating part (2); the pressing block (4) is in clearance fit with the rotating part (2) in a rotating mode; the compressing mechanism (5) is fixedly connected with the rotating part (2); the pressing block (4) presses the stress block (3) through the compressing mechanism; the stress block (3) is provided with a first sealing strip (3c); a second sealing strip (4e) is placed in a cavity (4d) of the pressing block (4); a first gap (2a) formed between the pressing block (4) and the outer wall surface of the rotating part (4) is sealed through the second sealing strip (4e); a threaded rod (7a) of a compressing screw (7) of the compressing mechanism (5) applies pressure to a force applying surface (4a2) of the pressing block (4), and the pressing block (4) compresses the first sealing strip (3c) of the stress block (3) through a first pressing surface (4a2) of a compressing surface (4a1) so that a second gap (8) formed between the pressing block (4) and the stress block (3) can be sealed. The sealing function is achieved through the simple mechanical sealing mechanism, gas exchange through the gap formed between the fixed part and the rotating part is prevented, in this way, external gas is prevented from entering the rotating part through the gap, and meanwhile gas inside the rotating part is prevented from leaking outwards through the gap.

The invention discloses an independent external-mounting maintenance-free multi-stage oil and gas separator assembly. The oil and gas separator assembly is characterized in that a first cyclone separation cavity consists of an oil and gas separator outer shell and an oil and gas separator body shell; a second dispersing separation cavity consists of the oil and gas separator body shell, an oil and gas separator cover and the outer walls of three refine separation conical pipes which are distributed on the circumference at 90 degrees; a third refine cyclone separation cavity consists of the three refine separation conical pipes which are distributed on the circumference at 90 degrees and a central pipe; a fourth reinforcement cyclone separation cavity consists of the three refine separation conical pipes which are distributed on the circumference at 90 degrees, a central pipe, and a cyclone blade; a fifth refine cyclone separation cavity consists of a small refine separation conical pipe arranged in the center of the circumference; a sixth compact and dispersing safety separation cavity consists of a safety valve cavity and a safety valve; an eighth separation cavity consists of a respirator compact plate and a safety damping net; a flow pressure adjusting valve consists of a flow pressure adjusting diaphragm in a respirator and a flow pressure adjusting spring; any installation mechanism consists of an installation support and variable air inlet and outlet pipe included angles; and an oil return cavity consists of a separation conical pipe bottom and an independent separator shell.

The invention discloses a dynamic feedback adjusting shield tunneling earth pressure balance control method. In earth pressure balance shield tunneling construction, the water and earth pressure of an excavated formation is determined at first and is taken as a reference value of earth bin pressure after being corrected; afterwards, in the shield tunneling test pushing process, ground surface settlement is detected in real time, and data obtained through monitoring is subjected to ground surface settlement analysis; and analysis results are transmitted to a shield tunneling control system, and the earth pressure balance of the excavated face is achieved by judging and adjusting the earth bin pressure. According to the method, formation deformation caused when shield tunneling penetrating downwards through important buildings such as existing railways and building compact districts is effectively controlled, and the influence of shield tunneling construction to the ground surface is reduced.