53results about How to "To achieve the purpose of decompression" patented technology

The invention discloses a hard top plate waterflooding pressure relief treatment method. The method comprises the following steps of S1, according to a stratum histogram, through combination with a rock mechanical property test, carrying out preliminary analysis on positions and development case of top plate separation fractures, S2, when cutting depth at an open-off cut on the work surface is in a range of 13-17m, drilling a row of holes on the top plate at a certain angle along a work surface advance direction, and observing top plate rock stratum crack development case by a borehole camera, S3, further detecting top board crack development case by a double-head water-plugging device detection system, S4, determining a top plate rock stratum crack development range and depth according to the results of the above three steps, and pouring high pressure water into the cracks by a high pressure water pump so that hard top plate integrity is broken and rock strength is reduced, and S5, after top plate pressure is released, sequentially pushing the work surface and repeating the above processes until work surface exploitation is finished. The method can realize accurate positioning of a pre-cracked top plate position and full utilization of a top plate separation layer crack space and is frees of artificial arrangement of a pre-cracking space.

The present invention discloses a pressure kettle. The pressure kettle comprises a kettle body, a kettle cover, a first movable component, a second movable component and a switch; an accommodating cavity is defined in the kettle body; a water outlet communicated with the accommodating cavity is formed in the kettle cover; a water outgoing valve for opening and close the water outlet is arranged in the kettle cover; an air exhausting channel communicated with the accommodating cavity is arranged on the kettle cover; the first movable component is arranged on the kettle cover so as to open and close the air exhausting channel; the second movable component is arranged on the kettle cover; the first movable component cooperates with the second movable component and the water outgoing valve, so that after the first movable component opens the air exhausting channel, the second movable component opens the water outgoing valve; and the switch is movably arranged on the kettle body or the kettle cover so as to move drive the first movable component to move. With the pressure kettle provided by the embodiments of the invention adopted, pressure relief before water discharge can be realized, the safety of the water discharge of the pressure kettle can be ensured. The pressure kettle has the advantages of simple structure, compactness, simple operation, safe and reliable water discharge.

The invention discloses a membrane auxiliary type compression bar destabilizing trigger type pressure relief device applied to the micro-pressure working condition. The membrane auxiliary type compression bar destabilizing trigger type pressure relief device mainly comprises a valve body, a valve clack, a valve deck, a lock arm, a lock catch, a membrane shell body, a membrane, a connecting rod, a hinge, a linkage tumbler, a slender bar, a nut, a bar cage and a pressure communicating pipe. The medium pressure is introduced to the shell body to be played on the membrane through the pressure communicating pipe, thrust load is produced, and the load is loaded on the slender bar through the connecting rod integrated with the membrane. Under the normal working condition, the load acting on the slender bar is less than the critical load of the slender bar, and the slender bar remains stable, the lock catch is locked in the lock arm at this moment, and the valve clack is fixed and can not take off, so that the device is in a closed state; under the abnormal working condition, the slender bar is destabilized and loses the bearing capacity, the membrane and the connecting rod are pushed by the medium pressure to move and drive the linkage tumbler to act, the lock arm is driven by the linkage tumbler to move, the lock catch is released from the lock catch, and the valve clack is disengaged from the sealing face of the valve body at this moment, so that the purpose of pressure relief is achieved.

The invention discloses a method for improving the extraction rate of a high residual gas content coal seam of an underground coal mine. The method comprises the following steps that a mounting hole is drilled; a hole opening sealing connection pipe fitting is mounted and fixed; construction of a gas extraction drill hole is conducted; CaC2 is stored in the gas extraction drill hole; a mine waterpressing pipeline is connected with the hole opening sealing connection pipe fitting, water is jetted into the gas extraction drill hole, and the hole opening sealing connection pipe fitting is closedafter jet is finished; CaC2 in the gas extraction drill hole and the water are subjected to reaction to generate Ca(OH)2 and C2H2, a large amount of heat is generated at the same time, under the thermal effect, coal seam gas is accelerated to conduct desorbing; and the hole opening sealing connection pipe fitting is connected with an extraction pipe, and gas extraction is conducted through pipe-linking. According to the method for improving the extraction rate of the high residual gas content coal seam of the underground coal mine, the temperature in the drill hole is further improved to promote gas desorption of the coal seam, and the gas extraction rate is improved accordingly; and interval hole drilling implement or concentrated hole drilling implement can be adopted according to occurrence characteristics of the coal seam and the drill hole arranging form. The method for improving the extraction rate of the high residual gas content coal seam of the underground coal mine has the characteristics of safety, high efficiency, reliability and small engineering quantity, and can be widely used in the field of gas extraction of the underground coal mine.

The invention discloses an oil pump. The oil pump comprises a pressure-limiting valve and a pump main body. The pump main body is provide with a high pressure oil cavity, a low pressure oil cavity, afeedback oil duct and an oil output duct communicating with the high pressure oil cavity. The pressure-limiting valve comprises a pressure-limiting valve element, an elastic part and a valve cylinder.The pressure-limiting valve element comprises a first valve element disk, a second valve element disk and a valve rod. The radial direction sectional area of the first valve element disk is smaller than the radial direction sectional area of the second valve element disk. The valve cylinder is provided with a first accommodating cylinder and a second accommodating cylinder. The first accommodating cylinder and the second accommodating cylinder communicate coaxially. A high pressure oil port communicating with the high pressure oil cavity and a low pressure oil port communicating with the lowpressure oil cavity are formed in the side wall of the second accommodating cylinder. The feedback oil duct communicates with the first accommodating cylinder. The elastic part is arranged inside thesecond accommodating cylinder. The high pressure oil port communicates with annular space enclosed by the first valve element disk, the second valve element disk and the valve cylinder. In the axial direction of the valve cylinder, the second valve element disk is located between the low pressure oil port and the high pressure oil port. According to the oil pump, the situation that when an enginestarts, the engine receives bigger oil pressure impact can be avoided.

Disclosed is a pressure vessel with a manual pressure relief valve. The manual pressure relief valve is a supplement to the pressure vessel. When a rupture disk which should be opened by high-pressure gas passing through the vessel is not opened or when a safety valve fails due to the fact that over-pressure gas is introduced into the vessel, pressure relief can be achieved in time by means of the manual pressure relief valve. The pressure vessel is characterized by comprising a tank body, the manual pressure relief valve is arranged on the outer wall of the tank body, the manual pressure relief valve comprises a valve body, one end of the valve body is fixed on the tank body through a fixed base, the other end of the valve body is connected with a pressure relief nut through threads, an ejector rod is arranged in the pressure relief nut, the front end of a valve element in the valve body corresponds to an inner cavity of the tank body, a press rod is arranged at the tail end of the valve element, and the press rod corresponds to the ejector rod.

The invention relates to a traffic tunnel surrounding rock cooperative control system and a construction method thereof. The traffic tunnel surrounding rock cooperative control system comprises a quick-setting slurry layer, a flexible explosion-proof energy absorption layer, a rigid guard plate layer and a rigid arch frame which can be sequentially arranged from the inner wall of a tunnel to the inner space of the tunnel, and a plurality of telescopic pieces are arranged between the flexible explosion-proof energy absorption layer and the rigid guard plate layer; a gap between the flexible explosion-proof energy absorption layer and the rigid guard plate layer is filled with a flexible material; and the flexible explosion-proof energy absorption layer can be fixedly connected with surrounding rock through anchoring pieces, and the anchoring pieces can be inserted into the surrounding rock. Through a supporting structure, the problem of surrounding rock large deformation faced by a traffic tunnel can be effectively prevented and controlled.

The invention discloses an armature iron core polishing device for an electric tool, and relates to the field of armature iron core polishing devices.The armature iron core polishing device comprises a transmission rod, a fixing assembly is arranged on the transmission rod, and a polishing assembly used for polishing an armature iron core is arranged on the fixing assembly. The armature core only needs to be clamped and fixed on one side distributed in the length direction of the transmission rod, the surface of the armature core can be polished by a fixed thickness through the polishing and grinding plate, and when protrusions exist on the surface of the armature core and are difficult to grind, the polishing and grinding plate can abut against the protrusions on the armature core to compress a first spring for avoiding; therefore, the protrusion position is slowly polished and ground off, and the phenomenon that the protrusion is polished off at a time and a pit which is difficult to repair is formed on the surface of the armature iron core is avoided.

The invention disclose an agricultural irrigation water pump with decontamination and anti-blocking functions. The water pump is characterized in that a connecting base is arranged at a water inlet of a pump body, the connecting base is connected with a water inlet flange of the pump body, a limiting mechanism is arranged at the end, away from the water inlet of the pump body, of the connecting base, the other end of a sliding rod is connected with a second end cover in a sleeved mode, the sliding rod is in bolted connection with the second end cover, a plurality of third connecting holes are fixedly connected with one ends of a plurality of connecting rods, and the other ends of the plurality of connecting rods penetrate through a decontamination brush to be fixedly connected with a shell. According to the agricultural irrigation water pump with the decontamination and anti-blocking functions, irrigation water is filtered by means of a filter sleeve, and when the outer wall of the filter sleeve is blocked by accumulated dirt, water pressure can push the second end cover and a first end cover to move towards the water inlet, so that the outer wall of the filter sleeve makes contact with the decontamination brush, decontamination operation on the surface of the filter sleeve is achieved, pressure stabilization is realized through the cooperation of the limiting mechanism, the first end cover, the second end cover, the connecting rods and a push block, and finally resetting of the filter sleeve is realized under action of a disc spring.

The invention discloses a linear bone file with a nerve monitoring function, the linear bone file is in a flat belt shape and is provided with a working part and a traction part, the working part comprises a filing area and a frame, the frame is fixed with the outer edge of the filing area, the filing area is a chain-shaped strip formed by longitudinally arranging or longitudinally and transversely flexibly connecting two or more filing pieces, and the traction part is connected with the chain-shaped strip. The working face of each filing piece is provided with filing lines, the back face of each filing piece is smooth, the traction parts are arranged at the two ends of the working part and fixedly connected with the frame, and at least one nerve monitoring element is arranged on the surface of the working part and/or the traction parts. The traditional mode that a high-speed abrasive drill is used for excising the vertebral plate is optimized, the vertebral plate is rasped through the fret saw, operation is easy, higher safety is achieved, nerve electrophysiological signals of the surgical site can be monitored in an operation, nerve function positioning and function evaluation can be conducted, surgical operation can be assisted and guided, and nerve damage is avoided.

The invention discloses an efficient gas pressure reducing device. The lower end of a high-pressure pipeline is communicated with the lower end of a low-pressure pipeline through a second shell, a valve hole with the size adjusted through vertical movement of a valve head is formed in the second shell, a damping cavity is formed in the bottom of the first shell, and a pipe hole used for vertical movement of a piston at the top of an air valve rod to be through is formed in the middle of the damping cavity; the piston at the top of the air valve rod is connected with a diaphragm, the diaphragmisolates a first shell inner cavity space on the upper portion of the diaphragm from a first shell damping cavity on the lower portion of the diaphragm, the damping cavity is isolated from the high-pressure pipeline and communicated with the low-pressure pipeline through a damping hole, and a diaphragm rod fixing part is arranged in the first shell inner cavity space on the upper portion of the diaphragm and fixedly connected with the diaphragm; the diaphragm rod fixing part is further connected with a permanent magnet through a connecting rod, a first cavity is reserved in the first shell inner cavity in the upper portion of the permanent magnet, and an electromagnetic force assembly is arranged at the top of the first shell inner cavity; and the efficient gas pressure reducing device further comprises a circuit board, a circuit system used for controlling the electromagnetic force assembly is arranged in the circuit board, and the circuit system is electrically connected with the electromagnetic force assembly.