142results about How to "Good pressure holding effect" patented technology

The invention relates to a flap valve structure of a pressure-maintaining coring device. The flap valve structure comprises a valve seat and a valve flap, one end of the valve flap is movably connected with the upper end of the valve seat, the top of the valve seat is provided with a valve port sealing surface matched with the valve flap, the valve port sealing surface is a conical surface, the valve flap is provided with a valve flap sealing surface matched with the valve port sealing surface, and the taper of the valve flap sealing surface is the same as the taper of the valve port sealing surface; the valve port sealing surface is provided with a bearing surface for supporting the valve flap; and when the valve flap is closed, the bottom of the valve flap abuts against the bearing surface of the valve seat. According to the flap valve structure of the pressure-maintaining coring device, when the valve flap is closed, displacement constraint is applied to the bottom surface and the side surface of the valve flap, the anti-deformation capability of the sealing surface can be effectively improved, the valve can bear higher pressure, and the pressure maintaining capability of the valve is improved; and the valve seat has magnetism, and the valve flap can be attracted to be closed.

A blowout containment system is permanently positioned on the wellhead. The blowout containment system is relatively inexpensive, is always available and in place, it does not interfere with normal drilling operations, will capture all of the oil and gas emitted by the blowout, does not require special or unique sea surface or underwater apparatus or vessels, does not have any operational requirements that are different than those which drilling crews normally use and are already familiar, and is activated the using actions are similar to those used by drilling crews for well drilling and completion.

The invention relates to the technical field of hydraulic transmission and aims to provide a pressure-regulating and pressure-retaining system for pressure-retained transferring of deep-sea sediments and a control method of the pressure-regulating and pressure-retaining system. The pressure-regulating and pressure-retaining system for pressure-retained transferring of the deep-sea sediments comprises a low-pressure pump, a high-pressure pump, check valves, filters, pressure sensors, stop valves, an energy accumulator and a proportional overflow valve. The control method is used for realizing a pressure-retained transferring process of a pressure-retained transferring device and comprises the processes of a pressurizing and pressure-retaining process of the pressure-retained transferring device, a pressurizing and pressure-retaining process of a subsample transferring cylinder, and a process of mounting a communicating vessel between ball valves I and II and pressurizing. According to the pressure-regulating and pressure-retaining system, a deep-sea environment at any depth can be simulated within a specialized range, the pressure in a deep-sea sediment sampler can be measured through the pressure sensor I and the overflow pressure of the pressure-retained transferring device can be automatically adjusted, so that the pressure in the pressure-retained transferring device and the pressure in the sampler are consistent and the purpose of pressure retaining is achieved.

The invention discloses a pressure filter comprising a plurality of filtering plate sets which are connected in sequence, wherein each filtering plate set comprises a main plate, an auxiliary plate, and an auxiliary frame, the auxiliary plate is fixed on one side of the main plate and on the same side of the main plate, the auxiliary frame is sleeved on the periphery of the auxiliary plate in a sliding mode, and the other side of the main plate is connected with the auxiliary frame of the adjacent filtering plate sets. Moreover, volume-changeable pressing filtering space used for containing materials is arranged between the adjacent filtering plate sets. Each filtering plate set is provided with a material channel which is communicated with the pressing filtering space. The other side of the main plate, opposite to the contact face of the auxiliary plate, is provided with a filtering mesh. Filter cloth wraps outside the filtering mesh. Each filtering plate set is also provided with a gas channel and a liquid channel which are communicated with the outside to the pressing filtering space. The pressure filter is high in structure reliability, has no leakage of the materials, and is convenient to maintain. The invention further provides a pressing filtering method. As pressing filtering and drying above the third level are adopted, water-filtering effect is better, size of the pressed and filtered material is larger, water containing rate of the materials is lower, work efficiency is higher, and production is higher.

The invention discloses an automatic pressure maintaining device which is provided with an oil inlet (A), an oil outlet (B), a pressure-maintaining oil port (C) and an oil return port (L). The automatic pressure maintaining device comprises an energy accumulator (1), a pressure-maintaining one-way valve (2), a pressure reducing valve (3), a sequence valve (4) and a pressure-maintaining control valve (5), the sequence valve is arranged on an internal main oil way (V1), the pressure reducing valve is arranged in a pressurizing oil way (V2), the pressure-maintaining one-way valve (2) is arranged between the energy accumulator and the pressure reducing valve, a reversing port of the pressure-maintaining one-way valve (2) is hydraulically connected with the energy accumulator, set opening pressure (P1) of the sequence valve is larger than set working pressure (P2) of the pressure reducing valve, and the pressure-maintaining control valve is arranged on a connecting oil way between the energy accumulator and the oil return port, so that when a hydraulic pressure value in the energy accumulator is larger than a pressure-maintaining lower limit value (Px), the sequence valve is controlled to be opened, and when the hydraulic pressure value is larger than a pressure-maintaining upper limit value (Ps), the energy accumulator is controlled to return oil to the oil return port and depressurize. The automatic pressure maintaining device can realize automatic pressurizing, pressure maintaining and depressurizing, and has good long-time pressure maintaining effect.

The invention discloses a forming delay mechanism for a die. The forming delay mechanism comprises a die loading part, an unloading part and a female die plate, wherein an elastic male die with a wedge-shaped groove formed in the side surface and a vertical rod parallel to the male die are arranged on the die loading part, and the head part of the vertical rod is wedge-shaped; an elastic push rod and an elastic limiting rod are arranged on the unloading part, the elastic push rod is matched with the wedge-shaped groove of the male die and the head part of the vertical rod by the wedge-shaped head part and an inclined plane at the tail part, a groove is formed in the side surface of the push rod, and the elastic limiting rod is matched with the groove of the push rod by the spherical head part and connected with the female die plate. The forming delay mechanism can prolong the forming action time of the male die and play a pressure maintaining role, has a better forming effect, achieves pressure maintaining to move mechanically, and is reliable in operation.

The invention discloses a preparation method of a continuous fiber reinforced nylon-6 composite material, which comprises the following steps: (1) separately storing caprolactam molten masses containing a catalyst and a catalyst promoter in a constant-temperature constant-speed liquid feeding tank; (2) placing a continuous fabric in a mold of an injection molding machine; (3) starting the injection molding machine and a constant-temperature liquid feeding device separately, adding the caprolactam molten masses containing the catalyst and the catalyst promoter into the feeding hole of the injection molding machine through the liquid feeding device at a same temperature and a same speed, mixing and injecting in the mold injection machine, and injecting the caprolactam molten masses containing the catalyst and the catalyst promoter into the mold paved with the continuous fabric; and (4) initiating caprolactam negative ring-opening polymerization in the mold. The preparation method disclosed by the invention can effectively prevent caprolactam from polymerization before entering the mold, so as to ensure good impregnation of fiber and caprolactam to obtain the continuous fiber reinforced nylon-6 composite material with more excellent mechanical properties.

The invention discloses an electro-hydraulic loading system of a film biaxial tensile testing machine. The electro-hydraulic loading system comprises a low-pressure filter, hydraulic pumps, a motor, a one-way valve, a stop valve, an energy storage device, an electromagnetic unloading valve, a proportional overflow valve, a pressure compensator, a proportional directional valve, a servo hydraulic cylinder, a pull pressure sensor, a displacement sensor, a mechanical fixture, a filter, a cooler and an oil tank, wherein the two hydraulic pumps share the one oil tank, and two independent loading hydraulic loops can be formed, so that the manufacturing cost and the installation space are greatly saved. Furthermore, the servo hydraulic cylinder can be controlled by the single set of pressure compensator and proportional directional valve, so that loading synchronism and stability can be guaranteed. The electro-hydraulic loading system of the film biaxial tensile testing machine has the characteristics of being simple in structure, large in tensile force, high in loading synchronism and accuracy, rapid in control response and the like, and can be used for film composite material biaxial tensile testing machines such as an architectural membrane material tester and an airship skin test as well as a uniaxial drawing tester.

Disclosed is a process for drilling natural gas hydrates with a submersible core drilling rig using pressure wireline, including: 1) placing the drilling rig in seawater; 2) adopting a suction-press core drilling mode in a soft sediment formation, a suction-rotary core drilling mode in a medium-hard sediment formation, or a pumping direct circle-rotary core drilling mode in a hard sediment formation; 3) extracting a core; 4) recovering an inner tube for wireline pressure coring; 5) tightening a holding seal cap and storing the inner tube in a pipe storage rack; 6) punching; 7) capturing an inner tube for wireline pressure coring which is hollow and disengaging the holding seal cap; 8) lowering the inner tube; 9) adding a drill rod; 10) punching; 11) repeating steps (2˜10) till the core drilling reaches a given drilling depth; 12) recovering the drill rod and the drill; 13) recovering the corer.

The invention discloses a pressure-maintaining hot runner nozzle. The pressure-maintaining hot runner nozzle comprises a channel cylinder and a nozzle. The center of the channel cylinder is provided with an injection channel and a liquid storage cavity. The nozzle comprises a spray-head part and a sleeve pipe. The sleeve pipe is connected to the inner wall of the liquid storage cavity by screw threads. The spray-head part is provided with an injection port. The center of the sleeve pipe is provided with a liquid communication chamber. The liquid storage cavity is provided with a plunger. A forth-step column can go deep into the injection channel. A second-step column is sleeved by a spring. One end of the spring can press against the sleeve pipe and the other end can press against the surface of a third-step column. The pressure-maintaining hot runner nozzle has the advantages that the plunger moves backwards under the action of the spring and the forth-step column blocks the injection channel thereby blocking a flowing channel of plastic melt so that plastic pressure-maintaining effects are superior to those of the existing injection port cooling solidification.

The invention provides a pressure maintaining device and equipment, and relates to the technical field of pressure maintaining equipment. The technical problems that during actual work of existing pressure maintaining mechanisms, not all of pressure maintaining faces of materials subjected to pressure maintaining can be kept horizontal relative to planes of pressure maintaining heads, consequently, the materials subjected to pressure maintaining are not stressed evenly, and the pressure maintaining effect is dissatisfactory are solved. The pressure maintaining device comprises a connecting base, a pressure maintaining head assembly and a power mechanism. The pressure maintaining head assembly comprises fixing blocks, intermediate blocks, pressure maintaining head bases and pressure maintaining heads. The intermediate blocks are hinged to the fixing blocks through first pin shafts. The pressure maintaining head bases are hinged to the intermediate blocks through second pin shafts. The first pin shafts are perpendicular to the second pin shafts. The fixing blocks, the intermediate blocks and the pressure maintaining head bases are fixedly connected in a detachable mode. The pressuremaintaining equipment comprises the pressure maintaining device. Through the pressure maintaining device and the pressure maintaining equipment, the effect that pressure maintaining force to the materials subjected to pressure maintaining is even can be ensured, and thus the material pressure maintaining effect is improved.

The invention discloses a pressure maintaining jig for an electronic device screen. The pressure maintaining jig for the electronic device screen comprises a pressure maintaining lower cover, a pressure maintaining upper cover, and a pressing plate assembly, wherein a holding groove for placing a shell to which a screen is attached is formed in the pressure maintaining lower cover; a first clamping piece is arranged on the pressure maintaining lower cover, and is a metal piece; the pressure maintaining upper cover is arranged on the pressure maintaining lower cover; a second clamping piece matched with the first clamping piece is arranged on the pressure maintaining upper cover, and is a metal piece; the pressing plate assembly is located between the pressure maintaining upper cover and the pressure maintaining lower cover; and the pressing plate assembly is connected with the pressure maintaining upper cover and is used for pressing the screen, so that the screen is pressed and attached onto the shell. According to the pressure maintaining jig for the electronic device screen, a pressure maintaining effect of the screen can be improved, the screen is prevented from loosening or upwarping, and the maintenance cost and the material loss are reduced. In addition, the service life of the pressure maintaining jig can be prolonged, and the pressure maintaining intensity of the pressure maintaining jig can be improved.

The invention discloses a preparation method of high-viscosity thixotropic slurry. The method comprises the process steps: (1) preparing a product from double components on site, wherein a component A is modified bentonite, the mixing weight part ratio of the component A to water ranges from (1: 1.5) to (1: 3), the component B is a silicate type viscosity-enhancing additive and the weight part ratio of the component A to the component B on site ranges from (12.5: 1) to (20: 1); (2) after sufficiently and uniformly mixing the component A slurry, adding the component B viscosity-enhancing additive according to the ratio; sufficiently and uniformly mixing to form the high-viscosity thixotropic slurry and pouring. According to the preparation method disclosed by the invention, the inorganic bentonite and the water are prepared into the slurry and the additive is added to react to form the high-viscosity thixotropic slurry, so as to realize safe tunneling of a tunnel boring machine in a complex formation.

The invention discloses a structure component of a filter board. The structure component comprises a main board, an auxiliary board and an auxiliary frame. The auxiliary board is arranged at and contacts with one side of the main board, and the auxiliary board and the main board are located at a same side; the auxiliary frame is slidably sleeved on the periphery of the auxiliary board; the periphery of the auxiliary board is provided with an auxiliary board ring table; an auxiliary frame ring table relative to the auxiliary board ring table is mounted at the inner side of the auxiliary frame; the auxiliary board ring table and the auxiliary frame ring table catch each other so as to restrict the slide stroke of the auxiliary frame within space between the auxiliary board ring table and the main board; an elastic element is arranged between the auxiliary frame and the main board and is fixed by an elastic element fixing part. According to the invention, the slide stroke of the auxiliary frame of the structure component of the filter board is fixed, which enables the stroke of press filtration to be further quantified and reliability of press filtration work to be improved; a detachable design of the elastic element fixing part facilitates replacing of the spring, and workload in equipment maintenance is small. The invention also discloses a filter press which has the advantages of high work efficiency and good draining effects.

The invention discloses an auxiliary runner structure for preventing deformation of an injection product. The auxiliary runner structure comprises a mold cavity channel, a main injection nozzle and a plurality of injection nozzles. Plastic melt passes through the mold cavity channel, the main injection nozzle and the injection nozzles communicate with the mold cavity channel through pouring gates, and control valve needles are arranged in the main injection nozzle and the injection nozzles. The auxiliary runner structure is arranged at the broken plastic melt flowing tail end of the mold cavity channel, is connected to the bottom of the product, and comprises a first auxiliary pouring gate, a second auxiliary pouring gate, a third auxiliary pouring gate, a fourth auxiliary pouring gate and a flowing channel. The first auxiliary pouring gate and the third auxiliary pouring gate are located on the same horizontal plane, and the second auxiliary pouring gate is opposite to the first auxiliary pouring gate. The structural strength and rigidity of the injection product before electroplating are improved, and the product cannot be distorted or deformed in the whole electroplating process.

The invention discloses a dowty retarder with piston overflowing inclined holes, relates to a dowty retarder, and particularly relates to a dowty retarder with piston overflowing inclined holes. The invention aims to solve the problems that the work of resistance is larger, the impact force to a return valve plate during returning is increased, and stable and slow returning cannot be realized because the piston overflowing hole of the dowty retarder is a straight hole in the prior art. According to the dowty retarder provided by the invention, the upper end of a piston is inserted into an opening in the lower end of a slide cylinder; the upper end face of the piston is provided with an annular overflowing gap; the bottom of the annular overflowing gap is provided with a plurality of piston overflowing inclined holes; the plurality of piston overflowing inclined holes and the annular overflowing gap form an overflowing channel; a speed valve plate is sleeved on the outer side wall at the upper end of a pressure valve seat; a seal cover is sleeved on the piston; a spring seat is arranged in an inner cavity of the piston; the upper end of a spring in a pressure valve is inserted into a groove in the lower end face of a pressure valve rod; the lower end of a spring in the pressure valve is sleeved on a boss at the upper end face of the spring seat; and the upper end of a spring outside the pressure valve is connected with the lower end face of the pressure valve rod. The dowty retarder with the piston overflowing inclined holes is used for railway transportation.

The invention belongs to the technical field of rubber pipe pressure testing, and discloses a rubber pipe online high-pressure and constant-pressure testing system which comprises a control terminal,a pressure test container, a high-pressure pump and a guide pipe. An inlet of the guide pipe is communicated with an outlet of the high-pressure pump, an outlet of the guide pipe is communicated withan opening of the pressure test container, a one-way valve and a pneumatic stop valve are sequentially arranged on the guide pipe, a pump end loading valve is arranged between the high-pressure pump and the one-way valve, a container loading valve is arranged between the one-way valve and the pneumatic stop valve, a pressure detection device is arranged between the pneumatic stop valve and the pressure test container, the high-pressure pump, the pneumatic stop valve, the pump end loading valve, and the container loading valve and the pressure detection device are electrically connected with the control terminal. According to the system, a lot of preparation time of manual testing is saved, the system is high in automation degree, the working efficiency is improved, product quality is stable, and the quality and the high-pressure and constant-pressure testing efficiency of a rubber pipe are improved in the production process of the rubber pipe.

The invention discloses a cylinder with a locking device. The cylinder with the locking device comprises a cylinder body, a piston rod and the locking device, wherein the cylinder body is composed of a cylinder barrel, a front end cover and a back end cover; the front end cover and the back end cover are arranged at the two ends of the cylinder barrel; a first cavity is formed in the cylinder barrel; a first through hole is formed in the front end cover; a first blind hole is formed in the back end cover; the first through hole and the first blind hole communicate with the first cavity separately; the piston rod is movably arranged in the first through hole, the first cavity and the first blind hole; one end, far away from the front end cover, of the piston rod is provided with a piston; the piston is movably arranged in the first cavity; and the locking device is arranged in the front end cover, is connected with the piston rod and is used for controlling the piston rod to be in a locking state or an unlocking state in the cylinder body. According to the cylinder with the locking device, with the mode, the cylinder can be locked by the locking device, so that the cylinder cannot automatically open, and the pressure holding effect of the cylinder is greatly improved.

The invention discloses a graphene-containing aircraft tire sealing layer rubber material and a preparation method thereof. The rubber material comprises the following raw materials by weight: 50-100parts of halogenated butyl rubber, 0-50 parts of synthetic rubber, 40-80 parts of a carbon black filler, 1-10 parts of graphene, 10-30 parts of flaky mineral, 0.5-3 parts of an acid absorption agent,4-20 parts of a processing aid, 0-5 parts of an anti-aging agent, 2-5 parts of tackifying resin, 1.5-5 parts of a vulcanizing agent and 1-2.5 parts of a vulcanization accelerator. According to the invention, by adding of graphene and flaky mineral, selection of other material varieties and reasonable formula proportioning, one or more aircraft tire sealing layer rubbers with good physical properties, gas tightness, heat aging resistance and aging cracking resistance can be designed. The rubber material has simple components and easily available raw materials, and is convenient for manufacturing and implementation. When applied to aircraft tires to serve as a sealing layer, the graphene-containing aircraft tire sealing layer rubber material can greatly reduce the permeability of aircraft tire inflation gas, improve the pressure maintaining performance of aircraft tires, and improve the safety and service life of aircraft tires.

The invention discloses a flow rate pairing valve and an electrohydraulic actuating mechanism adopting the same. The upper part and the lower part of a valve body of the flow rate pairing valve are provided with a piston and a one-way valve core; a reset spring is arranged on the one-way valve core in a sleeving way; a baffle ring is arranged on the reset spring; five oil collecting openings are formed in the valve body; one end of an oil pump is connected with one side of a first oil collecting opening of a flow rate pairing valve A, and the other end of the oil pump is connected with one side of a first oil collecting opening of a flow rate pairing valve B; the other side of the first oil collecting opening of the flow rate pairing valve A is connected with a third oil collecting opening and a fifth oil collecting opening of the flow rate pairing valve B; the other side of the first oil collecting opening of the flow rate pairing valve B is connected with a third oil collecting opening and a fifth oil collecting opening of the flow rate pairing valve A; second oil collecting openings of the flow rate pairing valve A and the flow rate pairing valve B are respectively connected with oil openings of an oil cylinder; fourth oil collecting openings of the flow rate pairing valve A and the flow rate pairing valve B are respectively connected with an oil tank. The flow rate pairing valve has the advantages that the structure is simple and compact; an electromagnetic valve is not needed; the output is realized by controlling the motor; the system belongs to an integration integral system.

The invention discloses an air-pressure type percolation instrument for municipal solid waste landfill and a use method of the percolation instrument and belongs to the field of environmental geotechnical engineering. The percolation instrument comprises a liquid storage chamber, a sample chamber, a base and a support, wherein a liquid inlet hole and an air inlet hole are formed in the top of the liquid storage chamber respectively, a nut is arranged in the liquid inlet hole in a sealed manner, an air inlet valve is arranged in the air inlet hole in a sealed manner, and an adjusting lever is arranged on the air inlet valve; an opening is formed in the lower part of the liquid storage chamber and is in sealed connection with the upper end of the sample chamber, the lower end of the sample chamber is connected with the base provided with water holes, the lower end of the base is arranged on the support, a conical barrel located below the water holes is arranged on the support, and a percolate container is arranged at the bottom of the conical barrel. The percolate is pressurized through air pressure, so that percolation time of the percolate is substantially shortened, besides, the percolation instrument is simple and compact in structure, flexible to operate and good in air impermeability, adsorption blocking rate of anti-seepage slurry can be tested more accurately, and the anti-seepage effect of vertical anti-seepage walls all around the municipal solid waste landfill is checked.

The invention discloses a power unit of a mobile cutter frame. The power unit is characterized by comprising a pneumatic power unit and a hydraulic power unit; a gas source enters a gas-liquid pump in the hydraulic power unit through the pneumatic power unit; the gas-liquid pump proportionally transforms different gas inlet pressures into corresponding oil pressures and outputs the oil pressures from an oil outlet; the oil outlet is connected with a mobile cutter frame oil cylinder for driving the mobile cutter frame. The pneumatic power unit provides three different gas pressures for the gas-liquid pump; by the gas-liquid pump in the hydraulic power unit, the proportional transform from the gas pressure to the oil pressure is realized; an energy accumulator can provide an oil return space for pre-fastening adjustment of the mobile cutter frame and is capable of keeping the pressure and supplementing oil during working of the mobile cutter frame oil cylinder; and an electromagnetic valve can be used for reliable sealing and total pressure releasing of the pipeline of the mobile cutter frame oil cylinder. In the invention, a rational and reliable power unit can be provided for the mobile cutter frame, so the working quality of the mobile cutter frame can be guaranteed fully.

The present invention discloses an oil field sewage treatment device which consists of a horizontal centrifugal separator, a first separation device, a second separation device and a base. The horizontal centrifuge separator is connected to the first separation device, the first separation device is connected to the second separation device, and the horizontal centrifugal separator, the first separation device and the second separation device are all mounted on the base. At first, suspended particles in the sewage are removed to obtain a single liquid medium using a centrifugal separating method which can directly and effectively remove the suspended particles and has minimal residues of the suspended particles. Then the remaining impurities in the sewage are removed using a distillation method which is more suitable for removal of the remaining water-soluble impurities and has a significant advantage than the existing sewage treatment device. Besides the use of natural gas filtration device can not only to realize the condensation of water vapor, but also remove the natural gas in the water vapor.

The invention provides a hydrogen energy automobile engine cover jacking device. The hydrogen energy automobile engine cover jacking device comprises a hydrogen tank, a sensor, an electronic control module and a jacking assembly. The jacking assembly is arranged below an engine cover. The jacking assembly comprises a sleeve and a push rod. The upper end of the push rod is connected with a jackingsupport. The lower end of the push rod is connected with a piston. The lower end of the push rod is inserted into the upper end of the sleeve. The lower end of the sleeve is connected with the hydrogen tank through a hydrogen pipe. A solenoid valve is arranged on the hydrogen pipe. The sensor is arranged in a foam anti-collision beam. The sensor is connected with an airbag controller. The airbag controller is connected with the electronic control module. The electronic control module is connected with the solenoid valve. The airbag controller detects whether a pedestrian is collided or not andtransmits a jacking signal to the electronic control module. The electronic control module controls the solenoid valve to be turned on, hydrogen is input into the sleeve, and the push rod jacks up the engine cover. The hydrogen energy automobile engine cover jacking device has the beneficial effects of absorbing energy generated when the pedestrian collides with the engine cover to protect the pedestrian against secondary injury. There is no need to adopt a gas generator to implement ignition to jack up the engine cover. Thus, the weight is reduced, and the hydrogen energy automobile engine cover jacking device is good in sealing and pressure maintaining effect and higher in reliability.

The invention relates to the field of rubber, and discloses a rubber composition based on halogenated butyl rubber, and vulcanized rubber and a preparation method and application of thereof. The composition contains a component A, a component B and a component C which are independently stored or stored in a mixed mode, wherein the component A contains base rubber, and the base rubber is halogenated butyl rubber or a mixture of the halogenated butyl rubber and natural rubber; the component B contains carbon black, anhydrite, an activating agent and a softening agent, and optionally contains ananti-aging agent; and the component C contains a vulcanizing agent and a vulcanization accelerator. The vulcanized rubber prepared from the rubber composition based on the halogenated butyl rubber provided by the invention can improve the airtight performance of a rubber material.

The invention relates a dedicated measuring instrument for shield grease water-resistant sealing and a test method thereof. The measuring instrument is mainly composed of a high-pressure gas source, aparallel-connected two-path pressurizing control device, a test tube and a pressure release valve; the two-path pressurizing control device is connected with the test tube by means of the high-pressure pipeline; a testing sieve plate is arranged at the bottom of a test tube main body. The test method comprises the following steps: placing the testing sieve plate in the test tube and injecting into shield grease, and injecting water into an upper part of the grease; pressurizing the test tube through the two-path pressurizing control system, and retaining for a certain time under the stipulated pressure; observing whether water seeps from the testing sieve plate at the bottom of the test tube, and recording the grease leakage rate. Through the tester and test method disclosed by the invention, the water-resistant sealing performance of the shield grease can be effectively reflected by stimulating a working condition of the shield grease in the shield construction under the high-pressure water environment.

The invention relates to starting of a pressure-maintaining corer sealing valve controlled by a torsion spring. The pressure-maintaining corer sealing valve comprises a flap valve, wherein the flap valve comprises a valve seat and a valve flap, one end of the valve flap is movably connected with the upper end of the valve seat through a rotating shaft, the top of the valve seat is provided with avalve opening sealing surface matched with the valve flap, the valve flap is provided with a valve flap sealing surface matched with the valve opening sealing surface, the rotating shaft is sleeved with a torsion spring, and the valve flap has a closed trend under the action of the torsion spring; a bearing surface for supporting the valve flap is arranged on the valve opening sealing surface; andwhen the valve flap is closed, the bottom of the valve flap abuts against the bearing surface of the valve seat. According to the pressure-maintaining corer sealing valve, under the action of no external force, the valve can be automatically closed under the action of the torsion spring, the flap valve can be automatically closed even if in the horizontal state, and the transition from only vertical drilling to horizontal drilling can be realized; and when the valve flap is closed, displacement constraint can be applied to the bottom surface and the side surface of the valve flap, the deformation resistance of the sealing surface can be effectively improved, the valve can bear higher pressure, and the pressure maintaining capability of the valve is improved.

The invention discloses a multipurpose electromagnetic valve, which comprises a valve seat and a valve seat sealing cover hermetically connected with the valve seat. The valve seat is provided with a flushing water discharge inlet, a concentrate water discharge opening and a flushing recirculation water opening; a water inlet cavity communicated with the flushing water discharge inlet and a flushing recirculation flow passage communicated with the flushing recirculation water opening are arranged in the valve seat; and the valve seat and the valve seat sealing cover form a concentrate water outlet cavity communicated with the concentrate water discharge opening. The flushing recirculation flow passage and the concentrate water outlet cavity are both communicated with the water inlet cavity, and a water sealing assembly controlling a waterway between the water inlet cavity and the flushing recirculation flow passage to be switched in an on state and an off state is arranged on the waterway of the water inlet cavity, which is communicated with the flushing recirculation flow passage. The invention also discloses a water purifier system consisting of the multipurpose electromagnetic valve; when the multipurpose electromagnetic valve adopting the above structure is applied to the water purifier system and when a reverse osmosis filtration assembly is flushed, flushing water can be utilized circularly, and water resources are saved.