186results about How to "Easy to unblock" patented technology

The invention discloses a detachable T-shaped microchannel device and a method for preparing monodisperse polymer microspheres by the same. The method comprises the following steps of: performing heat treatment on a needle tube serving as a disperse phase flowing channel, and processing a duct with the same outer diameter as the needle tube on a pipeline serving as a continuous phase flowing channel to make the disperse phase needle tube and the continuous phase tube form a T-shaped channel; under the stable operating condition, making dispersed fluid form uniform micro liquid drops at a T-shaped tube orifice through the shearing force of continuous phase fluid to the disperse phase fluid; and under the action of a shaker, diffusing an organic solvent out of the liquid drops, and curing the liquid drops to form the polymer microspheres with uniform particle size. The T-shaped microchannel device is simple in equipment and can be detached, and pipelines are easy to dredge after being blocked; and the prepared polymer microspheres have uniform particle size, the particle size distribution coefficient of less than 15 percent, the minimum particle size distribution coefficient of 3 percent, and smooth surfaces without adhesion.

The invention relates to a high-water-loss curing plugging agent for plugging fissures. The high-water-loss curing plugging agent comprises the following components in parts by weight: 50-70 parts of main materials, 7-15 parts of filter aid, 10-25 parts of curing agent, 5-10 parts of fiber materials and 5-10 parts of bridging materials. The curing plugging agent has the advantages of fast plugging, good effect, high acid solubility, easiness in unplugging, low cost and less environmental pollution.

The invention relates to a medical drainage tube, and especially relates to an anti-blocking abdominal cavity perfusion chemotherapy drainage tube; the drainage tube comprises an inner tube used for washing and an outer tube sleeved outside the inner tube and used for draining; a plurality of fixing sheets are arranged between the outer wall of the inner tube and the inner wall of the outer tube; the end wall of one end, extending into human body abdominal cavity, of the outer tube is arranged in an arc surface extruding outwards, and the center of the arc surface is provided with a front drainage hole; the side wall of the outer tube extending into the human body abdominal cavity is provided with a plurality of side drainage holes arranged in a spiral shape on the outer tube in the axial direction; the opening of one end of the inner tube is close to the front drainage hole, and can correspondingly wash the front drainage hole; the side wall of the inner tube is provided with a plurality of washing holes corresponding to the side drainage holes. The anti-blocking abdominal cavity perfusion chemotherapy drainage tube is reasonable in structure, big in washing scope, good in drainage effect, smooth and anti-blocking, convenient in usage, so patients can be comfortable in treatment, thus better carrying out abdominal cavity heat perfusion chemotherapy.

The invention discloses a biomass micro-positive-pressure pneumatic transmission system which comprises a feeding system, a fan, a conveying pipeline system, a discharging system, a tail gas treatment system and an automatic control system, wherein the feeding system comprises a quantitative feeding device, a collecting device, a positive-pressure air sealing device, an accelerator, an air guide pipe and a return air treatment pipeline; the conveying pipeline system comprises a straight pipeline, a connecting flange and a plurality of quick-operating doors distributed on the pipeline as well as a transparent observation window. The biomass micro-positive-pressure pneumatic transmission system has the advantages that smooth feeding with higher concentration ratio can be achieved, the power consumption is low, the service life of the air sealing device is prolonged, the applicability and the pipeline durability of the conveying system are improved, the convenience is provided for pipeline smoothening and repairing, the environmental pollution can be avoided, and the automation level is high.

The invention discloses a water swelling and plugging material and a preparation method thereof. The plugging material is prepared from the following raw materials by mass percent: 30 to 60% of water swelling materials, 5 to 20% of crosslinking agents and 30 to 55% of inert materials. The preparation method comprises the following steps of (1) respectively preparing the raw materials according to the formula ratio; (2) uniformly mixing and stirring the raw materials of the step (1) at room temperature and under normal pressure, so as to obtain the water swelling and plugging material. The water swelling and plugging material can absorb water to swell in loss zones, so that under the dual action of filling and plugging as well as squeezing and compaction, the loss zones are stably, reliably and effectively plugged well; in addition, the water swelling and plugging material can be easily and conveniently arranged on a drilling site, the process is simple and easy to implement, and the cost is low; in addition, the performance of water-based drilling fluid cannot be influenced, and the unplugging can be easily and conveniently realized.

The invention discloses an IP nucleus of chip system, capable of implementing the self-protection of data, relates to a data self-protection device in the nucleus, for solving the problem that the data protection in the existing IP nucleus is poor. The invention includes a storage unit in the IP nucleus for storing the data to be protected, wherein the storage unit in the IP nucleus is connected with the processor in the chip system through the bus. A logic controlling unit for generating the logic control signal, which is provided in the IP nucleus, is connected with the processor and contolled by the processor, and the generated logic control signal controls the corresponding logic control bits of storage unit in the IP nucleus in order that the storage unit in the IP nucleus is in the locked or delocked state. The invention can be used in the protection of data in the IP nucleus or the like. The invention has the advantages of strong data security, simple structure and lower cost.

The present invention discloses an oil-soluble temporary blocking agent and a preparation method thereof, wherein a thermoplastic polymer or a mixture comprising a thermoplastic polymer and one or a plurality of materials selected from a surfactant, an antioxidant and a coupling agent is adopted as a spinning raw material and is subjected to melt electrospinning to prepare the oil-soluble temporary blocking agent. According to the present invention, the oil-soluble temporary blocking agent can be adopted as the temporary blocking agent so as to be applied in the petroleum extraction field, such that the purposes of low cost and complete petroleum extraction and no pollution are achieved; the average diameter of the obtained temporary blocking agent of the present invention is a few microns to tens of microns, even achieves the nano-scale, the distribution is wide, and the oil-soluble temporary blocking agent is suitable for various types of oil wells with complex structures, particularly the temporary blocking operation on the core with the small crack width; the oil-soluble temporary blocking agent has characteristics of high oil dissolution rate, water insolubility, acid insolubility, low residual pollution on stratum, high solubility in diesel fuel, and easy blocking releasing; and the preparation method has characteristics of easily available raw materials, simple preparation process, low cost, and good applicability.

The invention provides a temporary plugging agent and a preparation method thereof. With the total mass of the temporary plugging agent as 100wt%, the temporary plugging agent comprises the raw materials of 25-35wt% of a high temperature salt-resistant extra high molecular polymer, 25-30wt% of modified oil soluble resin, 15-20wt% of a cross-linking agent, 5-10wt% of a surface active agent, 1-5wt% of solid particles and 1-5wt% of a fiber temperature-resistant material, wherein the sum of the mass percents of the raw materials of the temporary plugging agent is 100%; and the raw materials of the temporary plugging agent are all solid particles, and the diameters of the particles are 200-300 meshes. The invention further provides the preparation method of the temporary plugging agent. The temporary plugging agent can conduct continuous sand washing on an oil well, change of output after operation is not large, and construction and plug removal can succeed for one time; and the temporary plugging agent is suitable for sand washing construction of a heavy oil well, the sand washing effect is good, sand washing is thorough, the leakage amount is less, and the pump inspection period is prolonged.

The invention discloses a hydraulic automatic dredger for leachate filtering holes, and is suitable for solving the problem that a filter screen is blocked in a process of draining leachate of a garbage power plant. The hydraulic automatic dredger for the leachate filtering holes comprises a rack, a reciprocating linear driving mechanism and a dredging executing mechanism, wherein the rack is mounted on a wall of a garbage pool; the dredging executing mechanism comprises an elastic connector and a plurality of pins mounted on the elastic connector; the pins are in one-to-one correspondence to the filtering holes of a leachate filtering screen; the elastic connector is driven by power of the reciprocating linear driving mechanism to linearly move towards the leachate filtering screen until the various pins are inserted into the corresponding filtering holes, and at the moment, elasticity of the elastic connector can be stored; and when power driving of the reciprocating linear driving mechanism is withdrawn, the pins is pushed by the stored elasticity of the elastic connector to be reset. A pure manual construction mode in a current garbage power plant filtering screen dredging process can be eliminated, the mechanism is simple, degree of automation is high, and dredging efficiency and construction safety are improved.

The invention provides a pneumatic atomizing nozzle with the function of adjusting the sizes of atomizing particles. The pneumatic atomizing nozzle comprises a nozzle body. An air inlet and a liquid inlet are formed in the outer side of the nozzle body. A tapered nozzle orifice is formed in one end of a hollow cavity of the nozzle body. The aperture of the tapered nozzle orifice is increased from inside to outside. A cylindrical cavity is formed in the middle of the nozzle body. A tapered spray nozzle and a tapered bushing are sequentially arranged at the other end of the hollow cavity. A part between the outer part of the tapered spray nozzle and the inner wall of the nozzle body is sealed. A cavity between an outer taper surface of the tapered spray nozzle and the inner wall of the hollow cavity communicates with the liquid inlet. A cavity defined by the inner taper surface of the tapered spray nozzle, the inner wall of the hollow cavity and the outer side of the tapered bushing communicates with the air inlet. A part between the tapered bushing and the inner wall of the hollow cavity is sealed. A cylindrical through hole is formed in the center of the tapered bushing. A core shaft capable of moving in the axial direction to adjust the size of an air outlet of the tapered spray nozzle is arranged in the cylindrical through hole through a bushing and a sealing sleeve. A fastening sleeve is mounted on the core shaft to fix the bushing in the axial direction. A gland, which has an axial pressing effect, is arranged on the end surface of the tapered bushing. According to the pneumatic atomizing nozzle provided by the invention, the air spraying rate is adjusted by adjusting the core shaft so as to adjust the sizes of sprayed liquid drops. The pneumatic atomizing nozzle is suitable for various productions.

The invention discloses a protective training device for muscle training in a sports classroom, one end of a support frame is provided with an adjusting mechanism, and the adjusting mechanism comprises a sliding groove, a guide rod, a connecting block, a connecting belt, a mounting block, a rotating rod, a guide hole, an auxiliary rotating shaft, a support block, a clamping groove, a clamping plate, an extension spring, an embedded plate, an embedded groove, a support rod and a bearing frame; according to the structure, the adjusting mechanism is arranged, the connecting block is conveniently driven to move through the connecting belt, the extension spring is conveniently installed through the cooperation of the clamping groove and the clamping plate, when an exerciser is a beginner, the exerciser is assisted to do pull-up through the action of the extension spring, muscle strain caused by forced upward stretching is avoided, in addition, through the cooperation of the clamping groove and the support rod, the bearing frame can be conveniently installed, and therefore by placing a heavy object in the bearing frame, the exerciser can add the proper weight according to the situation of the exerciser, and the exercise effect is improved.

The invention relates to a brush hole type plug seedling planter which is characterized by comprising a bracket, wherein a seed plate is arranged on the bracket, the seed plate is provided with a plurality of planting holes at intervals, the seed plate penetrates through a seed containing box in a sliding manner, a guide sliding rod is penetrated on the seed containing box above the seed plate in a sliding manner and is arranged in parallel with the seed plate, and two ends of the guide sliding rod are arranged on the bracket. The brush hole type plug seedling planter has the advantages of simple structure, convenience for operation, low cost, high reliability, and no damage to seeds, can meet the demands of precision drilling of one hole one seed, is suitable for dry seeds or wet seeds of crops such as cotton and the like, and has wide application prospect in the modern facility agriculture.

The invention relates to the technical field of chemical environmental protection and discloses a pipeline clearing and cleaning device for chemical environmental protection. The device comprises a bottom plate, a limit ring is arranged at the top of the bottom plate, two movable blocks sleeve the limit ring and are symmetrical with the axis of the limit ring, the bottom ends of the movable blocksare fixedly connected to a connecting rod, the bottom end of the connecting rod is fixedly connected to a box body, a driving motor is fixedly installed inside the box body, and a rotating rod is fixedly installed on the left end of an output shaft of the driving motor. According to the pipeline clearing and cleaning device, through the cooperation of a crushing blade, a crushing rod and a limitspring, by using the resilience of the limit spring, going deep in the pipeline blocking narrow space is facilitated, with the cooperation of the crushing blade and a cutting piece, sundries at a blockage position of a pipeline are cut and crushed, therefore, the effect of breaking blockage is achieved, and the release of the pipe blockage is facilitated.

The invention discloses an efficient rice whitener. The rice whitener comprises a box body, wherein a hopper is arranged on the top end of the box body, a rice outlet is opened on the left side of thebox body outer wall, a furfuryl outer is opened on the center of the front surface of the box body bottom end, a first base is arranged on the center of the box body bottom end, a second base is arranged on the right side of the box body, a second rotating rod is arranged on the top end of the box body inner cavity, the outer wall of the second rotating rod is sequentially mounted with a second belt wheel and a sand roller, a through hole plate is arranged below the screen, and vertical rods are arranged on the left side and the right side of the through hole plate. According to the rice whitener, a ejector rod is periodically pushed by a cam to move up and down to drive the through hole plate to move up and down, the through hole plate moves upwards in the slide path and is squeezed downby a spring, the meshes in the screen are dredged through a series of operation of the through hole plate, the screen is dredged regularly, so that the chaff sucking process is more efficient, and rice and chaff are separated more clearly, so that low production efficiency since the screen is blocked is avoided.

The invention relates to a self-dredging rubbish pool percolate grating plate system and belongs to the technical field of rubbish pool percolate equipment. The self-dredging rubbish pool percolate grating plate system comprises a percolate grating plate, a dredging system executing mechanism used in coordination with the percolate grating plate and a hydraulic cylinder controlling the dredging system executing mechanism to act, wherein the dredging system executing mechanism comprises through columns and rams, the through columns are installed on the rams, the rams are installed on guide rodsand capable of sliding along the guide rods and driving the through columns to perform dredging on the percolate grating plate, one ends of the guide rods are connected to the percolate grating plate, the other ends of the guide rods are installed to ram fixing seats, and the ram fixing seats are installed to a supporting rack. According to the self-dredging rubbish pool percolate grating plate system, the rams are pushed to perform alternating motions along the guide rods through the hydraulic cylinder, the through columns on the rams finish dredging work on grating plate holes, the remote control and set timing automatic dredging work is realized, the dredging method and the operating environment are improved, and the dredging effect and efficiency are improved.

The invention relates to an intelligent dredger for a sewer of a bituminous concrete road. The intelligent dredger comprises a self-stabilizing walking device, wherein a lower support round table is welded to the middle of the upper end surface of the self-stabilizing walking device, six support round columns are uniformly welded to the upper end surface of the lower support round table along the axis direction, a support stand column is welded to the middle of the upper end surface of the lower support round table, an upper support round table is welded to the upper end surfaces of the support stand column and the six support round columns, a connecting plate is mounted to the upper end surface of the upper support round table through screws, a support bent arm is welded to the middle of the upper end surface of the connecting plate, a lifting locking device is welded to the tail end of the support bent arm, and four ribbed blocks are welded between the periphery of the tail end of the support bent arm and an angle conversion device, the angle conversion device has the advantage that the cleaning angle is accurately adjustable, so that the bent part of a pipeline is easy to dredge, and a searching decontaminating device is mounted to the lower end of the angle conversion device. The intelligent dredger can realize the full-automatic dredging function for the sewer, and thus a novel path for automatically and efficiently cleaning the sewer is provided.

The invention discloses an organic matter anaerobic fermentation processing method based on circulation stirring. Before fermentation raw materials are placed in, a circulation flow hole is covered with a flow blocking plate so as to block convection of a feed inlet and a discharge outlet, then, fermentation raw materials are poured into the feed inlet, a stirring rod is pulled to promote the fermentation raw materials to deeply enter a fermentation cavity in the direction from the feed inlet to the discharge outlet, and uniform distribution of the fermentation raw materials is promoted; the fermentation raw materials are poured into the feed inlet, the stirring rod is pulled to carry out stirring in the direction from the feed inlet to the discharge outlet in a turbulence area, and uniform distribution of the fermentation raw materials in the fermentation cavity is promoted.

The invention discloses a plugging agent for a low-pressure leakage gas well, and a preparation method and an application method thereof. The plugging agent is prepared through the following steps: 1)stirring 0.3-0.7wt% of guanidine gum dry powder and clear water for mixing to form a mixture, and stirring at a constant temperature for 45-60 min; 2) adding 2-5% of calcium carbonate powder of whichthe particle size is 1000-2000 meshes into formed guanidine gum liquid after mixing, and stirring at the constant temperature for 20-30 min; 3) adding 1-3% of a polyvinyl alcohol fiber of which the length is 6-10 mm and the diameter is 20 Am into mixed liquid, and stirring at the constant temperature for 20-30 min; 4) adding 0.3-0.5% of an expanded particle of which the particle size is 1-3 mm into the mixed liquid, and stirring at the constant temperature for 1-3 min; 5) adding 0.3-0.5% of an expanded particle of which the particle size is 0.025-0.425 mm into the mixed liquid, and stirring at the constant temperature for 1-3 min to obtain the plugging agent for the low-pressure leakage gas well. The plugging agent can be directly used for the well repairing and leaking stoppage construction of the leakage gas well, and technical support is provided for a well repairing field well control operation; in addition, the plugging agent is simple in plug removal measure, and plug removal can be carried out through the injection of a plugging remover.

The invention relates to filtering equipment, and especially relates to anti-obstruction environment-friendly type draining filtering equipment. The invention provides the anti-obstruction environment-friendly type draining filtering equipment capable of conveniently cleaning a foreign material. The environment-friendly type draining filtering equipment comprises a water frame, a liquid outlet mechanism, a material stirring mechanism, an outlet pipe, a filter screen plate, a water outlet valve, a drainpipe, a filtering case, and a water outlet curved tube; the outlet pipe is fixedly connectedwith the bottom of the water frame, the filtering case is fixedly connected with the bottom of the outlet pipe, and is communicated with the outlet pipe, a through hole arranged at top of the filtering case far from the outlet pipe, and the liquid outlet mechanism is fixedly connected with the bottom of the water frame. The environment-friendly type draining filtering equipment prevents obstruction for a sewage pipe and has easy dredge effect.

The invention discloses a side drainage type directly-embedded part. The directly-embedded part comprises a straight pipe which is of a cylinder structure, a spigot and socket pipe is fixedly arrangedat the middle position in the straight pipe in the axial direction and comprises a horn mouth section and a straight pipe section, the outer ring of the thicker end of the horn mouth section is fixedly connected to the inner wall of the straight pipe, one end of the straight pipe section is fixedly connected to the thinner end of the horn mouth section, a spigot and socket ring groove is formed between the outer circle of the straight pipe section and the inner wall of the straight pipe, and pre-embedded positioning structures are arranged on the outer circumference and the two end parts of the straight pipe. The invention further discloses a construction method for the side drainage type directly-embedded part. According to the directly-embedded part and the construction method thereof,the usage amount of waterproof materials, backfilling materials and drainage branch pipe fittings can be decreased, the wall penetrating and chiseling and hole plugging operation can be reduced, the structural strength quality of a wall body can be improved, the construction difficulty and the construction cost can be lowered, the drainage safety can be greatly improved, and the pipeline blockageprobability can be lowered.

The invention discloses an adjustable multifunctional sewage treatment method, which is characterized in that a booster pump is installed at the side position of the top end of a treatment box, the input port of the booster pump is fixedly connected with a water inlet pipe, a self-separation mechanism is installed at the side position of the inner wall of the treatment box, the self-separation mechanism comprises a rotating rod, a placing plate, a supporting block, a heavy ball, a limiting plate, an ejector rod, a telescopic spring, a limiting block, a fixing block, a rotating plate, a mounting groove, an auxiliary rubber roller, a partition plate, a first grid and a second grid. According to the invention, by structurally arranging a self-separation mechanism, large impurities in sewage can be conveniently filtered under the action of a placing plate and a second grid; and when the placing plate is perpendicular to the bottom of a treatment box, an ejector rod impacts a rotating plate through the gravitational acceleration of a heavy ball, so that larger impurities can be conveniently guided into a first grid through an auxiliary rubber roller, and the sewage and the larger impurities can be separated in sequence.

The invention provides a soil-drilling water injector, which belongs to the components of water apparatuses and has a column body; one side of the column body is provided with a water pipe, while the other side is provided with a drilling awl; the central parts of the water pipe and the column body are provided with water channels which are communicated with each other; a water pressing concave slot is arranged at the lateral side of the column body; one end of an injection hole on the column body is communicated with the water pressing concave slot, while the other end is communicated with the water channels; when in use, the soil-drilling water injector can be arranged on an injection device and pressed into the earth around the fruit tree through the drilling awl under external pressure so as to inject the irrigation water into the soil through the water channels, the water injection hole and the water pressing concave slot. The irrigation water is injected underground into the soil of the root part of the plant so as to reduce the ground evaporation and protect the soil aggregate structure from damage; besides, the water injector does not cause soil compaction and focuses on localized irrigation, with obvious water-saving effect.

The invention discloses an anti-blocking toilet with a dredging device. In order to solve the blocking problem of toilets simply, efficiently and hygienically, one or more dredging holes (3) are formed in suitable position(s) of a drainage pipe of the toilet, and each dredging hole (3) is connected with each corresponding water pipe (4) or casing pipe (5). The other end of each water pipe (4) is connected with a tap water pipe (9) through a valve (7); when the toilet is blocked, the blocked position is scoured directly by opening the valve (7); the other end of each casing pipe (5) is fixed in a water box body or at other positions of the toilet; a dredging rod (6) made of elastic materials, such as a steel wire spring can penetrate into the dredging hole(s) (3) from the upper port(s) of the casing pipe(s) (5), and then penetrate into the drainage pipe through the dredging holes (3) to dredge the blocked position. The water flow scouring operation can be carried out only by opening and closing the valve (7); and the dredging rod (6) has stronger dredging capability; and the valve (7) and the dredging rod (6) have respective advantages and supplement each other.

The invention provides a water-saving indoor drainage system which is composed of a toilet horizontal branch pipe, a kitchen horizontal branch pipe, a balcony horizontal branch pipe, a sewage discharger, an odor-proof valve and the like. The height of a pouring board is slightly lowered and a cushion layer is thickened to lay the toilet horizontal branch pipe, the kitchen horizontal branch pipe, the balcony horizontal branch pipe, the sewage discharger, the odor-proof valve and the like into the same floor layer so as not to pass through the floor to enter other households. The indoor drainage system provided by the invention has the advantages of automatically-utilized waste water, water conservation, energy conservation, emission reduction, less expenditure, no odor and floor drainage while relieving nature, no stench returned from an sanitary appliance joint and a closestool, no blockage of the closestool, no blockage and water leakage and easy dredging of a pipe, less loss of room height and good appearance. The water-saving indoor drainage system is applicable to water drainage and conservation transformation of buildings such as houses, hotels, wards and the like, and the system meets the need of the water-saving society.

The invention relates to a folding squatting pan. The folding squatting pan mainly comprises a base and a cover, wherein the base is only provided with a defecating pool; the cover is a urinating pit; the squatting pan is perfect after the cover is opened; and the cover seems disappeared on the ground. Therefore, the folding squatting pan is safe, sanitary, odorless and occupies a small number of spaces. Compared with the conventional squatting pan, the squatting pan has the advantages of smaller upper surface area, low depth and easy assembly. A sealing rubber strip is arranged between the base and the cover, so that even more flush water cannot overflow, water is saved and blockage is prevented. The cover can be provided with a mirror, a lamp and a flushing nozzle, so that the folding squatting pan is more economized, sanitary and healthy.

The invention discloses an integrated device for filtering pipelines, removing water hammer and preventing frost crack. The integrated device comprises a casing (1), an air bag (2), a filtering net (3) and a drainage valve (4). By the device formed by the components, through the technical scheme that the drainage valve is used for cleaning and draining, the air bag is used for eliminating the damage of the frost crack and water hammer, and the functions of filtering, removing water hammer and preventing frost crack are integrally connected to an inlet pipeline of tap water in series, the problems and shortcomings of inconvenient cleaning, unreliable anti-freezing and drainage outside pressure relief in the prior art are overcome; and the inlet pipeline of the tap water can achieve the purposes of convenient cleaning, reliable anti-freezing and internally removing the water hammer.

The invention discloses a drainage dredging machine with an amplifying circuit. The drainage dredging machine comprises a spiral steel-wire, a drill bit, steel hairs, a camera, a singlechip, a wireless communication unit and a motor, wherein an amplifying circuit is connected in series between the camera and the singlechip; the amplifying circuit comprises a diode D1 and a resistor R4 which are both connected in series between the reverse input end and the output end of an operational amplifier A1; the anode of the diode D1 is electrically connected with the reverse input end of the operational amplifier A1; the cathode of the diode D1 is electrically connected with the resistor; the diode D2 and a resistor R5 are connected in series between the reverse input end and the output end of the operational amplifier A1; the cathode of the diode D2 is electrically connected with the reverse input end of the operational amplifier A1; the anode of the diode D2 is electrically connected with the resistor R5; a resistor R2 is electrically connected between the reverse input end and the output end of the operational amplifier A1; the reverse input end of the operational amplifier A1 is connected in series with a resistor R1. The purpose of easy and convenient drainage dredging is achieved.

The invention discloses a soluble weighting salt low-damage drilling fluid and a preparation method thereof. The soluble weighting salt low-damage drilling fluid comprises the following components in percentage by mass: 10-20% of organic salt, 3-5% of inorganic salt, 0.1-0.3% of viscosifier, 0.5-1.0% of fluid loss agent, 0.5-5.0% of temporary shielding agent, 0.1-0.3% of alkalinity control agent, 0.03-0.1% of preservative, 0.5-0.8% of deoxidant, 0.1-0.2% of corrosion inhibitor and the balance of water. The soluble weighting salt low-damage drilling fluid disclosed by the invention has stable performance and high liquid phase density, is easy to regulate, realizes good rheological property, can effectively protect the storage layer, maintain stability of the well wall and improve the drilling encounter ratio of the storage layer, and is particularly suitable for a horizontal-section storage layer of mudstone.

The invention discloses an anti-sideslip carding device for carpet textile production. The anti-sideslip carding device comprises a base, a carpet body and an upper top plate, transmission rollers areconnected into the base in a penetrating mode, the rear end of the transmission roller on the left side is connected with an output end of a first motor, the carpet body is arranged above a slip resistance belt, a slip resistance pad is connected to outer surfaces of pressing rollers in an adhering mode, a connecting plate is arranged behind the pressing rollers, a limiting hole is formed in a fixing plate, a fixing hole is formed in the connecting plate, fixing bolts are connected into the limiting hole and the fixing hole in a penetrating mode, and every two rear ends of the pressing rollers are connected through a belt. According to the anti-sideslip carding device for carpet textile production, damage to a surface of a carpet wool layer cannot be caused, fluff and dust can be conveniently collected, sideslip in the carpet carding process can be avoided, and position limitation can be conveniently conducted on carpets of different thicknesses and sizes.

The invention relates to a soluble plug. The soluble plug comprises an outer ring (1) capable of being rapidly dissolved and a middle part (2) capable of being dissolved slowly. The outer ring (1) isconnected with the inner wall of a working pipe barrel. An insoluble sealing layer (3) is arranged below the outer ring (1) and the middle part (2). After the ground preparation work is completed, a certain amount of water or other solution is poured into an oil pipe or a working wellbore, the outer ring (1) is dissolved, at the moment, the dissolving speed of the middle part (2) is slow or the middle part is insoluble, the outer ring (1) dissolves, and a gap or a through hole is formed between the outer ring (1) and the working pipe barrel; and the dissolving speed of the middle part (2) is slow, and the oil gas is limited. The plug unsealing mode is simple, fishing does not need to be carried out after unsealing, and production of oil and gas cannot be influenced.