37results about How to "Good pressure retention" patented technology

The invention provides a gas-liquid balancing device for a vertical ram milling head, which can realize balance of a machine ram. The invention adopts the following technical scheme that the gas-liquid balancing device for the vertical ram milling head comprises two balancing cylinders, an energy accumulator and an overflowing and throttling structure; the two balancing cylinders are respectively arranged on both sides of the ram milling head; the energy accumulator is simultaneously connected with oil outlet pipelines of the two balancing cylinders through a main pipeline by a three-way connecting mechanism; the energy accumulator is provided with an oil drainage branch circuit; the overflowing and throttling structure comprises a safety valve, a first control valve and a second control valve; the safety valve and the first control valve are arranged on the oil drainage branch circuit; and the second control valve is arranged on the main pipeline.

The invention relates to a rotary valve type valve rod and a control valve in order to overcome the defects of difficult machining and high fabrication cost of existing rotary valve type valve rods. The rotary valve type valve rod comprises a plurality of valve rod sections; valve rod oil channels are designed in the valve rod sections; the adjacent valve rod sections are sequentially and fixedly connected in the axial direction; the positions, on the axial end faces of the valve rod sections, of the valve rod oil channels are communicated with the outside or with the valve rod oil channels in the adjacent valve rod sections; some valve rod sections are provided with spherical surface joints which are provided with annular spherical surfaces surrounding the valve rod sections; each annular spherical surface is provided with a valve rod oil opening which is communicated with the corresponding valve rod oil channel. The valve rod is mainly composed of the multiple valve rod sections, the machining difficulty of the valve rod sections is low, and molding for forming the valve rod oil channels is simple. Meanwhile, the structures of part of the multiple valve rod sections forming the valve rod can be made to be identical, the interchangeability can be greatly improved, and the machining difficulty can be greatly reduced.

An arc-shaped top hammer type four-sided top ultra-high pressure device, the device includes a cylinder with a cylindrical structure, a support ring installed outside the pressure cylinder through interference fit, and a support ring installed outside the support ring through interference fit. For the centering support ring, the upper and lower ends of the cylinder are respectively provided with mutually symmetrical top hammers in the middle, and both sides of the centering support ring are respectively provided with radial and mutually symmetrical arc-shaped top hammers. The present invention uses four top hammers on the upper, lower and left and right sides to pressurize the pressure cylinder, and the pressure force is closer to the "hydrostatic pressure", so that the pressure cylinder can withstand greater pressure and has better pressure maintaining performance. The heat preservation performance of the top pressure cylinder on both sides is maintained, and the side is pressurized by an arc-shaped top hammer, so there will be no prestress relaxation and creep, so that the pressure cylinder is always under stable pressure during work, and the fatigue strength is high. It is not easy to be damaged, and the stability of pressurization is higher, and it has a very ideal technical effect.

The invention relates to a high pressure die-locking circuit of a dual-motion plate direct pressure injection machine, comprising an oil pump which is driven by an electric motor, an electromagnetic reversing valve, an electromagnetic switch valve, overflow valves, a hydraulic control check valve and a high pressure die-locking oil cylinder; the electric motor drives the oil pump; the oil outlet of the oil pump is connected with the electromagnetic reversing valve; one working oil nozzle of the electromagnetic reversing valve is connected with the high pressure chamber of the high pressure die-locking oil cylinder through the hydraulic control check valve; another working oil nozzle of the electromagnetic reversing valve is connected with the recovery chamber of the high pressure die-locking oil cylinder; the oil outlet of the oil pump and the recovery chamber of the high pressure die-locking oil cylinder are both provided with the overflow valves; the non-rod chamber of the high pressure die-locking oil cylinder is connected with an oil tank through the electromagnetic switch valve. The proposal sufficiently considers the working characteristics of the dual-motion direct pressinginjection machine and optimizes and simplifies the high pressure die-locking control oil path, and the invention is the high pressure die-locking circuit of the dual-motion direct pressing injection machine with more reasonable structure.

The invention discloses a double-gate structure of the front gate of the bulkhead of an earth pressure balance shield screw conveyor, which comprises a left gate, a right gate, an oil nozzle and a driver, and the left gate and the right gate are relatively movably arranged behind the front bulkhead part, and the left gate and the right gate cooperate with each other and form a sealed cavity; the driver includes a left driver and a right driver, and the left driver and the right driver are symmetrically arranged on the outside of the left gate and the right gate respectively, and the movable end of the left driver is connected to the left The gate is fixedly connected, and the movable end of the right driver is fixedly connected with the right gate; both the left gate and the right gate are provided with oil nozzles, and the oil nozzles communicate with the sealing chamber. The present invention realizes the complete sealing and pressure maintaining of the soil chamber of the shield machine by arranging a double gate structure on the front bulkhead of the screw conveyor and injecting grease into the sealing chamber for sealing.

The invention discloses a pressure maintaining fixture of an axle housing automation line. The pressure maintaining fixture comprises a fixture body and a clamping device, wherein the fixture body is in a plate structure, and is provided with a hydraulic oil runner inside; the clamping device comprises two V-shaped clamping bases arranged above the fixture body, and a positioning clamper arranged above the fixture body and positioned between the two V-shaped clamping bases; each V-shaped clamping base comprises a static clamping column and a movable clamping column; a first thin oil pressure cylinder and a tension arm driven by the first thin oil pressure cylinder are vertically arranged at the upper end of each movable clamping column; clamping rods for clamping the two ends of an axle housing and second thin oil pressure cylinders for driving the clamping rods are arranged at the outer side of each movable clamping column; and the positioning clampers comprise static positioning blocks and movable positioning blocks. The pressure maintaining fixture of the axle housing automation line can guarantee the clamping force of the fixture to reach the positioning requirement so as to reliably fix the axle housing.

The invention relates to a control valve. By means of the control valve, the deficiencies that an existing control valve is large in leakage amount and low in reliability are overcome. The control valve comprises a valve body and a valve rod. The two ends of the valve rod are provided with a positioning mechanism and a rotating mechanism respectively. Valve rod oil channels are formed in the valve rod. The valve rod is provided with spherical sections. Valve rod oil ports communicated with the valve rod oil channels are formed in the spherical sections. Valve port channels which are perpendicular to the valve rod are formed in the valve body. Sleeves are arranged in the valve port channels. One ends of the sleeves make contact with the spherical sections in a line seal mode, and the other ends of the sleeves are provided with springs. The springs provide elastic force for the sleeves. Spring cavities are communicated with valve body oil channels in the valve body. When the valve rod oil ports and the sleeves are opposite, the valve rod oil channels are communicated with the valve body oil channels through the sleeves. According to the rotary-valve-type control valve, when the valve rod is rotated, the valve rod oil channels are communicated with different oil channels in the valve body through the cooperation between the valve rod oil ports and the sleeves, and the trend of oil ways is controlled. The spherical sections are in line-contact connection with the sleeves in a cone sealing mode, good sealing line-contact can be maintained, the control valve cannot be stuck, and the rotary-valve-type control valve has the advantages of being small in leakage amount and high in reliability.