221results about How to "Guaranteed sealing effect" patented technology

A pneumatic particle size classifying device for solid particles comprises a fluidized bed main body, a cyclone separator, material inlets, an air distributing system, a secondary air port, a coarse material outlet and a fine material collecting and discharging system. The material inlets are positioned on the middle upper portion of the fluidized bed main body and are distributed on four walls in a multi-point manner, the hopper-shaped air distributing system consists of an inclined air distributing plate, the coarse material outlet is arranged in the center of the inclined air distributing plate, the fine material collecting and discharging system consists of a fine material collecting chamber and an intermittent discharging valve and is directly connected with a lower particle outlet of the cyclone separator, or the fine material collecting and discharging system can consist of a fine material collecting chamber and a fine material discharge port and is connected with a particle outlet of a feedback valve. The pneumatic particle size classifying device is simple in structure, effective pneumatic particle size classification for selective coking coal particles is carried out by fluidization technology, retaining time of the particles in the bed body can be effectively prolonged, the pneumatic particle size classifying device is stable in running and fine in separation effect, and energy and coking coal resources are greatly saved.

The invention discloses a three-cavity sterile bag and a preparation method thereof. The square sterile bag consists of a double-cavity inner bag and an outer packaging bag, wherein the double-cavity inner bag is formed by welding horn-shaped liquid filling ports, arc-shaped insufficient soldering strips with opening points, thermal transfer with independent cavities, hanging holes, an A liquid medicament cavity, an intermediate liquid medicament cavity, a C liquid medicament cavity, three-cavity bag sides, three-cavity bag corners, straight-strip sealing grids, a medicament delivery plug and a medicament feeding plug into a whole through heat seal; and one side of the outer packaging bag is provided with an outer packaging bag welding edge and an outer packaging bag opening mouth. The preparation method of the sterile bag comprises the steps of bag molding, preparation of filling junctions of the bag, filling, lamp inspection, packaging and sterilization. The three-cavity sterile bag is simple in structure and easy to operate; and for the insufficient soldering of the bag, scientific external force opening points are designed, so that the insufficient soldering of the bag is more operable.

The invention provides a U-shaped pipe underground fluid multilayer sampling device. The U-shaped pipe underground fluid multilayer sampling device comprises a ground auxiliary system, a supporting system, a gas getting unit, water getting units and interlayer packers. The gas getting unit, the water getting units and the packers are arranged on a supporting connection rod of the supporting system. The gas getting unit is arranged in an aeration zone above a water table, the water getting units are arranged below the water table, the packers are mixed with the gas getting unit and the water getting units, waterpower incontinuity of upper parts and lower parts of sampling units in sampling layers of different aquifers or the same aquifer is achieved, and underwater of the different aquifers is sealed and cannot be mutually disturbed by drilled channels. The U-shaped pipe underground fluid multilayer sampling device is simple and novel in structural design and free of starting pressure, the service life of equipment is prolonged, the sample introduction speed is increased, the cost is reduced, and the application range is wider.

The invention discloses a rotation self-stopping convergent type rotary seal structure. The rotation self-stopping convergent type rotary seal structure comprises a stator inner ring and a stator outer ring. A high-pressure rotation stopping cavity is formed between the inner surface of the stator outer ring and the outer surface of the stator inner ring, and a plurality of seal teeth are arranged on the inner surface of the stator outer ring. The stator inner ring is provided with low-pressure rotation stopping cavities and rotation stopping jet holes. The jet angle alpha of the rotation stopping jet holes is greater than or equal to 30 degrees but smaller than or equal to 60 degrees, and high-speed jet flow with the rotation direction opposite to that of a rotation component is formed inside the low-pressure rotation stopping cavities. The cavity depths of convergent type seal cavities in the structural forms of labyrinth annular cavities, bag type cavities, round hole cavities, hexagonal honeycomb cavities and the like in the stator inner ring are gradually decreased in the flowing direction. Upstream seal teeth of the seal cavities in the stator inner ring are provided with tooth crest grooves. Convergent type seal gaps between the seal cavities in the stator inner ring and the outer surface of the rotation component are linearly reduced in the flowing direction. According to the rotation self-stopping convergent type rotary seal structure, circumferential rotational flow in the seal cavities can be reduced effectively, effective damping and effective rigidity of the rotary seal are improved, and the static and dynamic stability of a rotor system is enhanced.

The invention discloses a device and a method for multi-stage layering sand prevention and well completion by one-step pipe column. The device comprises an oil-string casing inserted into a first oil layer, a second oil layer and a third oil layer in sequence, wherein a blind pipe is arranged in the oil-string casing; a pipe column which integrates setting seal and examining seal is arranged inside the blind pipe; release suspension packers, first safety connectors, first sand prevention pipe columns, first isolation packers, second safety connectors, second sand prevention pipe columns, second isolation packers, third sand prevention pipe columns and supporting slips are arranged on the outer side of the blind pipe from the top down in a sleeving way; the upper part of the pipe column which integrates the setting seal and the examining seal is connected with a standard oil pipe; the lower part thereof and the release suspension packers are integrally connected to be a whole; the first sand prevention pipe columns are aligned to the first oil layer; the second sand prevention pipe columns are aligned to the second oil layer; the third sand prevention pipe columns are aligned to the third oil layer; and the supporting slips are mounted at the lower end of the blind pipe and positioned below the third oil layer. According to the invention, the number of layered stages is not limited, so that the setting seal and examining seal operations can be performed at the same time, thereby guaranteeing the seal effect of the packers in all stages and improving the well repairing efficiency.

The invention relates to a device for controlling water feeding, particularly to a gate structure of taking water from different layers or taking water together by a plurality of layers, and specifically to a layered water intake gate. The device comprises a stop log gate arranged at a water intake, wherein the complete gate is placed in a gate groove; the gate groove is fixed on a concrete dam base, and is characterized in that the stop log gate comprises a plurality of gate sections, wherein a telescopic rod is arranged between every two gate sections for connection; each telescopic rod is connected with a main beam of each gate section; a power output device for driving the telescopic rod to move is arranged on each telescopic rod. The device has flexile operation, simple structure, and small investment, is beneficial to popularization and application, and has active using effect.

The invention discloses a road crack filling and repairing process. The key point of the technical scheme is as follows: the road crack filling and repairing process comprises the following steps: cutting and slotting, namely cutting and slotting a pavement according a standard operation for damaged cracks of the pavement, wherein the slot width is 1.3-3cm, the slot depth is smaller than 3cm, paving dry pebbles in the lower part of the pavement when the slot width is 3-6cm, and carrying out glue filling and cap sealing in 2cm in the upper part, wherein a dustproof operation is adopted in the process; filling crack cleaning, namely cleaning a filling slot by high pressure hot wind of a heat spray gun, wherein the temperature of the heat spray gun is set at 1500 DEG C, the pressure of an airsource is 0.2-0.5MPa, and the filling crack cleaning speed is 10m / min in summer and 5m / min in winter; carrying out crack filling operation, namely injecting filling glue into the filling slot througha filling machine, and controlling the height of the filling layer to be not lower than about 0.5cm of the pavement; and cooling and maintaining, namely after the filling operation, paving dry sand,lime powder and the like to the surface of the filling material during maintenance and vibrating, compacting and floating the pavement, wherein the road can come into use within about 10-20min. The road crack filling and repairing process can be used for repairing micro cracks of the pavement quickly, so that the service life of the road is prolonged, and the maintenance cost is lowered.

The invention relates to a heat sealing machine. The heat sealing machine comprises a machine frame, wherein a sealing machine body is arranged on the machine frame and comprises an electric control cabinet, a pressure feeding device is arranged in the electric control cabinet and comprises a fixed roller and a rolling shaft which are arranged oppositely, and an adjusting mechanism which is used for adjusting the pressure between the rolling shaft and the fixed roller is further arranged in the electric control cabinet. According to the heat sealing machine, the distance between the rolling shaft and the fixed roller which are arranged on the heat sealing machine can be adjusted, and packaging bags with various thicknesses can be sent out; packaging bags with different specifications and models can be sealed through adjustment of the height of the machine frame; due to the fact that a balance adjusting mechanism is arranged, the sealing machine is prevented from inclining or shaking, and the sealing effect of the sealing machine is guaranteed.

The invention discloses a wet-type clutch comprising two output shaft assemblies which are arranged in parallel and two gas-liquid conversion pressure cylinders, wherein each output shaft assembly comprises a clutch driving shaft, a clutch driven shaft coaxially arranged with the clutch driving shaft, a clutch fixed between the clutch driving shaft and the clutch driven shaft, a hydraulic cylinder combined with a driving clutch, and a compression spring set driving the clutch to separate; each clutch driving shaft and each clutch driven shaft are connected with a clutch box body by bearings; each clutch driving shaft is fixed with a driving shaft gear meshed with a gear of an input shaft; a matching part, matched with an input shaft of a speed changer, is arranged at the outer end of eachdriven shaft of the clutch; and a liquid medium outlet of the gas-liquid conversion pressure cylinder is connected with a cylinder body of a hydraulic cylinder. For the wet-type clutch, the sealing effect of a hydraulic circuit is ensured, the structure is simplified, and the processing cost is reduced.

Balance chamber supercharged piston fast reposition air cannon comprises an air storage tank, an inlet pipe communicated with the air storage tank and a two-way valve used for controlling air entering in the air storage tank, a piston barrel, a piston, a piston barrel end plate and a piston type sealed exhaust control device consisting of a pumping chamber and an offsetting spring in the piston barrel are arranged on the air storage tank, the bottom surface of the piston is contacted with the nozzle of an outlet pipe in sealing way, and a countercurrent hole communicated with the pumping chamber and the air storage tank is arranged on the side wall of the piston. The invention is characterized in that a leak-off airway tube controlled by a two position two-way electromagnetic valve is arranged on the end plate of the piston barrel to communicate with the pumping chamber and the external environment, the piston is a cylindrical enclosed structure and a hole which is used for leak-off airway tube to pass is arranged on the bottom plate of the piston. The invention has the advantages that the pressure and the impact force putting on the piston and the offsetting spring can be largely reduced, the ring-snapping can be prevented, thus prolonging the service life of the equipments, and petty materials can be prevented from dropping in the air storage tank from the outlet pipe, thus ensuring the using effect of the equipment.

The invention discloses a high-strength self-degradation packing material and a preparation method thereof, and relates to chemical water plugging of a high-water-cut horizontal well. The material is prepared from the following components in portion by weight: 5-30 portions of acrylate, 0-30 portions of acrylamide, 1-30 portions of guanidine gum, 0.001-2.0 portions of strength adjusting agent, 0.001-2.0 portions of peroxide, 0.3-10 portions of beta-mannase and 50-75 portions of water. All components are uniformly mixed and stirred according to certain proportion and order, mixed liquor over a moderate amount is poured into the predetermined horizontal section of the horizontal well, and the separation of the horizontal section can be realized after 4-12 hours. The material has high strength and strong water absorbability, and the phenomenon that the conventional gel material has poor annular plugging at the horizontal section of the horizontal well is overcome. The material can be completely self-degraded after 96 hours, and the pollution problem of the conventional water plugging material to the horizontal section of production is solved. Thus, the material can be used as an annular packing material for water plugging of the horizontal well and plugging.

The invention provides a cement paste system and a preparation method thereof. The cement paste system comprises the following raw materials: G-grade oil well cement, a high-temperature-resistant elastic material, a high-temperature-resistant fluid loss agent, a high-temperature-resistant inorganic anti-channeling emulsion, a weighting agent, a high-temperature strength stabilizer, a dispersing agent, a paste regulator, a retarder and water. A cement sheath formed by using the cement slurry system in a high-temperature and high-pressure environment and in a later large fracturing constructionprocess has good elastic performance, can maintain the integrity for a long time, effectively ensures interlayer sealing, and reduces the risk of sustained casing pressure of a shale gas well.

The invention provides a civil air defense sealing door. The protective sealing door comprises a door body (1) and a door frame (2), the door body (1) is provided with sealing grooves (3), openings ofthe sealing grooves (3) face the door frame (2), the door frame (2) is provided with stirrups (4), the stirrups (4) are arranged in the mode of corresponding to the sealing grooves (3) and extend outtowards the door body (1), sealing airbags (5) are arranged in the sealing grooves (3) and made of elastic materials and have a natural state, an inflating state and an expansion state, the sealing airbags (5) and the stirrups (4) are arranged at intervals in the natural state, the sealing airbags (5) are in sealing contact with the stirrups (4) when in the inflating state, and the sealing airbags (5) are stretched and deformed in the expansion state and attached to the two sides of the stirrups (4). According to the protective sealing door, the effective sealing protective performance can beprovided, and the protective sealing door is effectively prevented from leakage.

The invention relates to an all-sealed vibration damping and water preventing device with large regulating quantity, which is mainly used for a cable-stayed bridge, a suspension bridge, an arch bridge and other span structures. The all-sealed vibration damping and water preventing device is in an upper and lower flange structure and comprises an upper flange (4), a lower flange (2) and a sleeve (6), wherein the upper flange (4) and the lower flange (2) are arranged up and down; the upper flange (4) is fixedly sleeved at the lower part of the sleeve (6); a rubber gasket (3) is embedded between the upper flange (4) and the lower flange (2); the sleeve (6) is internally provided with a vibration damper or a rubber centering ring (10); a first sealant (11) is filled between the vibration damper or the rubber centering ring (10) and a sleeve opening positioned on the outlet end of the sleeve (6); the end surface of the first sealant (11) is in the shape of a round table; and the outlet end of the sleeve (6) is provided with a water preventing cover (7), and a rubber sealing ring (12) and a second sealant (13) are adopted to carry out two-end seal on an upper port and a lower port of the water preventing cover (7). The all-sealed vibration damping and water preventing device ensures the sealing protection effect of a bridge in the actual operation process and meets the requirements on a long-life system of the bridge.

The invention discloses a valve rod retreating prevention device for a high-pressure valve. The device comprises a valve body, a valve rod, a hand wheel, a mounting bar, a connection insertion block,a placing sleeve, a screw, a cylinder, a spring, a strip groove, a rubber head cover, a disc, a circular sleeve, a movable round rod, a first rubber sleeve, a connecting bar, a limiting groove, a through groove, a slot, a second rubber sleeve, an L-shaped groove, a sealing ring, an annular oil storage tank, a fine hole, a fixed pipe, a rubber bar, a connecting cylinder and a ball. The device is reasonable in structure; through an extension structure, the movable round rod can be lifted in the vertical direction; when the valve body is closed, the movable round rod can be inserted in the limiting groove of the hand wheel to prevent rotation of the hand wheel by external force; meanwhile, through arrangement of the bolt, the hand wheel can be limited; when the movable round rod is lifted, only the connecting bar slides in the strip groove and the L-shaped groove; and after the movable round rod is collected into the cylinder, the connecting bar moves to the tail end of the L-shaped groove, and the connecting bar can be stopped, so that the operation is simple.

The invention discloses a large-aperture efficient static blasting auxiliary orienting device. The large-aperture efficient static blasting auxiliary orienting device comprises a first semi-circular tube, a second semi-circular tube, a guide partition and a tapered plug, wherein the guide partition is arranged inside the first semi-circular tube and the second semi-circular tube, and the two sideedges of the guide partition separately extend into vertical connecting beams between the first semi-circular tube and the second semi-circular tube; the lower end of the guide partition is flush to the lower end of the first semi-circular tube; and the tapered plug is blocked into an upper end opening of the first semi-circular tube and an upper end opening of the second semi-circular tube. The invention further discloses a static blasting construction method for the large-aperture efficient static blasting auxiliary orienting device. Blasting guide effect is achieved by utilizing stress concentration effect, generated on a semi-circular steel tube and a steel plate with a blade, by expansion pressure of an static cracking effect; single-hole one charge amount is great, expansion pressureis great, crushing ability is improved, cracking time is greatly shortened, and crushing efficiency is remarkably improved; and meanwhile, a hole-spraying phenomenon of the static cracking agent is effectively solved, safety is good, operation is simple, practicability is high, repeated use can be realized, and range of application is wide.

The invention provides a sealing device for laser welding, and relates to a sealing structure. The device solves the problems that the multi-position continuous laser welding of structural members cannot be completed and the pressure bearing cannot be realized in the processes of vacuum pumping and argon filling for the existing laser welding by using transparent glass. The device comprises a vacuum chamber and a mounting frame which is fixedly provided with a transparent glass plate, and also comprises an air cylinder fixing seat, a sealing cover plate, N air cylinders, N slide valves and N push rods, wherein the mounting frame which is fixedly provided with the transparent glass plate is inserted into the middle of the upper wall of the vacuum chamber; the N air cylinders are uniformly distributed on the air cylinder fixing seat in the circumferential direction, and the end parts of driving rods of the N air cylinders are fixedly mounted on the sealing cover plate; the N slide valves are uniformly distributed on the edge of the mounting frame which is fixedly provided with the transparent glass plate, each slide valve comprises a valve rod, a valve body and a sealing ring, the sealing rings are fixedly mounted on the valve rods, the valve rods are vertically mounted in the valve bodies in a sliding manner, and the sealing rings are bonded with inner cavities of the valve bodies. The device is used for laser welding.

The invention relates to a method and device for washing cooking materials. The method includes the steps of 1, according to demands, adding the cooking materials into a container; 2, using a drivingdevice to drive a pipe, and inserting the pipe into the container, wherein the outlet of the pipe is positioned in the cooking materials and is close to the bottom of the container; 3, supplying waterto the pipe through a water system; 4, after water is introduced through the pipe for a certain time, stopping the water system from introducing water, and sucking water out of the container throughthe pipe when the water system runs again to complete washing once; 5, according to different cooking materials, selecting different washing frequencies, and repeating the step 3 and the step 4 according to the corresponding washing frequency; 6, using the driving device to drive the pipe to detach from the container to complete the whole washing process. According to the method for washing the cooking materials, damage caused by interference from external force to the cooking materials is avoided, meanwhile different washing frequencies can be selected according to different materials, the cooking materials are preserved well, and the situation that the taste after cooking is influenced since the cooking materials are damaged can be avoided.

The invention discloses a ceramic ball valve, which consists of a shell, a valve rod, a ceramic ball, a left ceramic valve seat, a right ceramic valve seat, a ceramic middle body, a ceramic flange inner lining, a flange inner lining metal ring and a positioning metal ring, wherein the outer side face of the left ceramic valve seat is in close contact with the inner side face of the shell; the outer side face of the right ceramic valve seat is in close contact with the inner side face of the ceramic middle body; the other end of the ceramic middle body is in close contact with the interior of the left ceramic valve seat; a disc spring pressing ring is arranged between the right vertical surface of the right ceramic valve seat and the ceramic flange inner lining; and a disc spring is arranged between the disc spring pressing ring and the right vertical surface of the right ceramic valve seat. The ceramic ball valve has the characteristics of automatically adjusting a gap of the ceramic ball and the ceramic valve seat, along with good sealing effect on a valve rod part, long service life and good sealing effect.

The invention relates to a system for automatically detecting the airtightness of windows and doors of a building and a control method. A blower plenum chamber is provided with a high pressure blowertherein, and is successively provided thereon with a lower plenum chamber, a low efficient air filter element, a middle plenum chamber, a high efficient air filter element, an upper plenum chamber andan air duct. The air duct is connected to a to-be-detected window member and a sealing film so as to form an air cavity. The upper plenum chamber and the middle plenum chamber which are on two sidesof the high efficient filter element are in separate connection to a lower pressure input end and a high pressure input end of a filter element differential pressure transmitter. The window member andthe sealing film form an air cavity which is connected to a window differential pressure transmitter. According to the invention, the control method herein uses the differential difference between the upper and lower sides of the high efficient filter element to determine the air volume. Compared with conventional methods which adopt an anemometer or a flow meter to determine air volume, the method herein is much easier and more accurate. Since the rotation velocity of the blower is controlled by a programmable controller, the system and the method herein can achieve automation in the monitoring process, can cooperate with the computer to automatically record data, greatly reduce manual interference and have great social and practical value.

The invention discloses a container. The container is provided with a bottom locking mechanism and comprises a lock piece, a first lock hook, a first lock rod, a first extension rod, a first connecting rod and a swing rod, wherein the middle of the first lock hook can be rotatably connected with a lower beam of a door frame and one end of the first lock hook is provided with a hook part which is matched with the lock piece; the first lock rod is arranged below a bottom plate and vertical to a side plate; one end of the first extension rod is fixed on the first lock rod, while the other end extends vertical to the direction of the first lock rod; two ends of the first connecting rod are respectively pivotally connected with the other end of the first extension rod and the other end of the first lock hook; and the swing rod is used for driving the first lock rod to rotate between an opening position and a locking position, and one end of the swing rod is fixedly connected with the first lock rod. When the first lock rod is positioned at the opening position, the hook part of the first lock hook is separated from the lock piece, and when the first lock rod is positioned at the locking position, the hook part hooks the lock piece. The container effectively prevents the lower beam of the door frame from deforming due to goods extrusion and the like by arranging the bottom locking mechanism.

The invention relates to a double-cover buckled-type plastic preservation box which comprises a box body and a box cover, an outward flanging is arranged at the opening part of the box body, the box cover is provided with a seal groove, a seal strip is arranged in the seal groove, the seal strip and the opening part of the box body are mutually matched in a sealing way, and a rib is arranged under the box cover and provided with a fastener which is in contact with the lower edge of the flanging of the box body. The double-cover buckled-type plastic preservation box is characterized in that: a cover sleeve is arranged outside the box cover, and the inner wall of the periphery of the cover sleeve is in inward force fit with the rib of the box cover. The double-cover buckled-type plastic preservation box has the major characteristics that: the cover sleeve is arranged outside the box cover; when the plastic preservation box is used, the box cover covers the box body so that the seal strip of the box cover and the opening part of the box body are sealed, the fastener of the rib of the box cover is buckled at the lower edge of the flanging of the box body, and then the cover sleeve is covered; and because the inner wall of the periphery of the cover sleeve internally presses the rib of the box cover, the fastener in the rib cannot slip off by self after grasping the lower edge of the flanging of the box body, therefore, the connection reliability of the box cover and the box body is greatly improved, and the sealing effect is ensured.

The invention relates to an improved crown fruit bagging machine and belongs to the technical field of agricultural machinery. Turning motors are respectively supported above the inner side at the four corners of a bagging box of the machine; horizontal output shafts of the turning motors are fixedly connected with hanging rods in vertical and horizontal positions; hanging needles are arranged at one ends of the hanging rods away from the turning motors; when the hanging rods are located in the vertical position, the hanging needles are located on the inner side of the corresponding upper layer bagging bayonets; when the hanging rods are located in the horizontal position, the hanging needles are located on the inner side of the corresponding turning motors; after the four bagging corners are released, a bag opening is hooked by the hanging needles on the inner side of the bayonets and can not fall off; and under the driving of the turning motors, the bag opening is gradually lifted and gradually contracted till being separated from the hanging needle and the sealing opening in the process of the hanging rods transferring from the vertical position to the horizontal position. The improved crown fruit bagging machine can effectively prevent the bag from falling off and can ensure the opening sealing effect.

The invention discloses a pre-grouting reinforcement method for a working face crossing through faults. The method comprises the following steps: step 1, pre-drilling a working face top plate in a fault passing area to form a pre-drilled hole; step 2, grouting the pre-drilled hole, and injecting a reinforcing material to seal a surrounding rock crack; step 3, after the reinforcing material is completely solidified, drilling the working face top plate to form medium-deep holes; step 4, grouting and injecting a reinforcing material into the middle-deep holes through a grouting device; step 5, after the reinforcing material is completely solidified, drilling the part, between the adjacent medium-deep holes, of the working face top plate to form a deep holes; and step 6, grouting the deep holethrough the grouting device. The method has the advantages that the reinforcement of the working face top plate is realized through pre-grouting, gas can be prevented from leaking from surrounding rock crack, and the later gas extraction effect is improved; and in addition, the deep hole and the medium-deep holes are combined with a two-step grouting process, so that the phenomena of side fallingand roof leakage of the top plate when the working face crosses through the fault are prevented.

The invention discloses a novel oil-gas well filling system and an application method of the system. The oil-gas well filling system comprises an oil-gas well wall and a well-in pipe string put into an oil-gas well, wherein the well-in pipe string and the well wall form a ring space, and the well-in pipe string is provided with at least one circulation-controllable device. By using the novel oil-gas well filling system, a compact and complete half-penetrative seal baffling ring can be achieved in a whole oil-gas well. The method specifically comprises the phases of: 1, opening the circulation-controllable device, and forming a filling grain sand bed; 2, closing the circulation-controllable device; 3, completely building a half-penetrative seal baffling ring. The novel oil-gas well filling system facilitates building of the compact and complete half-penetrative seal baffle ring under the condition that flow-controlling filter pipe columns are placed, improving success rate of building of the half-penetrative seal baffling ring, and thus achieving the seal and baffling effect required by a half-penetrative seal baffling flow-controlling technology.

The invention discloses a fracturing device for exploitation of coal bed methane in a low-permeability zone. According to the device, a fracturing controller is used for controlling the fracturing condition of a fracturing pipe and the hole sealing condition of a segmented hole sealing mechanism for fracturing respectively, and the fracturing condition in a fracturing hole can be effectively controlled. The segmented hole sealing mechanism for fracturing of the device can separate all segments of the fracturing pipe in the fracturing hole in a separated sealed manner, and segmented fracturingoperation is realized by utilizing each segment of the fracturing pipe, so that the uniformity and completeness of fracturing are effectively improved, and the fracturing capacity is ensured. When hole sealing operation is carried out on each section, the hole sealing effect of each section can be ensured, the hole sealing efficiency is ensured, the fracturing capacity of each section of fracturing is improved, and the fracturing effect is guaranteed.

The invention discloses an air film protection type packaging method and an air film protection type packaging device. According to the air film protection type packaging method, a plastic film is used as a packaging material, a to-be-packaged object is put in two layers of packaging films which are pulled in place, and the object can be sealed and packaged through the following six steps: sucking air; sealing the opening; pulling the films; filling air; sealing the opening; cutting off and the like. The air film protection type packaging device comprises a bracket, a screw guide rail film pulling mechanism, a cylinder lifting opening sealing mechanism, a cylinder expansion air suction mechanism, a cylinder expansion air filling mechanism, a position compensation mobile block, a compressible movable lifting platform and a cylinder lifting cutoff mechanism. By using air as a buffering substance, the air film protection type packaging method can solve the problem of waste of a paper box packaging material and a buffering material; the air films are utilized for effectively protecting the packaged objects; and the air film protection type packaging method satisfies green and environment protection conceptions and is applicable to packaging of valuable objects, explosive objects and fragile objects.

The invention relates to the technical field of rock wall hole sealing, and discloses an automatic water absorption sealing-hole plugging device for a near-horizontal coal seam gas extraction drill hole. The device comprises a connecting pipe, a front-section grout stopping plug, a rear-section grout stopping plug, a grouting pipe and an exhaust pipe, a grouting space for injecting hole sealing grout is formed between the front-section grout stopping plug and the rear-section grout stopping plug, and inner side ports of a grouting pipe and an exhaust pipe penetrate through the rear-section grout stopping plug and extend into the grouting space; each of the front-section grout stopping plug and the rear-section grout stopping plug comprises an inner side baffle facing one side of the grouting space, an outer side baffle deviating from one side of the grouting space, and water swelling rubber and water absorption resin which are packed between the inner side baffle and the outer side baffle; and the shape and the area of the outer side baffle and the inner side baffle are matched with the cross section of the drill hole, the outer side baffle and the inner side baffle are provided with mounting holes, and the outer side baffle and the inner side baffle fixedly sleeve the outside of the connecting pipe through the mounting holes respectively. The automatic water absorption sealing-hole plugging method for the near-horizontal coal seam gas extraction drill hole is provided.