1364 results about "Open hole" patented technology

The invention discloses an elastic support integrated bearing and squeeze film damper integrated structure with outer ring radial holes. The elastic support integrated bearing and squeeze film damper integrated structure comprises an elastic support integrated outer ring, a bearing inner ring, a retainer, a rolling body, a squeeze film damper, a bearing seat and the like. The elastic support integrated outer ring adopts the integrated design of a squirrel-cage type elastic support and the bearing outer ring, the radial size is reduced, the centering precision is improved, and an oil storage groove and a radial oil hole are formed in the outer side wall of the bearing outer ring of the integrated structure; the extrusion oil film damper is located on the outer side of the elastic support integrated bearing, and an oil film is communicated with a radial oil hole in the bearing outer ring, so that bearing lubrication and the extrusion oil film damper share a lubricating oil path; radial lubricating oil lubrication of the bearing is achieved through the arrangement of the radial oil holes, and the situation that the bearing is damaged due to lack of oil lubrication under the extreme working condition is avoided; meanwhile, the oil storage grooves and the radial oil holes can effectively promote flowing of lubricating oil in an oil film, formation of a dead cavity of the squeeze oil film damper is avoided, and the vibration reduction effect of the squeeze oil film damper is enhanced.

The invention discloses an earth surface directional drilling high-pressure deep hole grouting construction method based on steel sleeve hole fixing. The earth surface directional drilling high-pressure deep hole grouting construction method comprises the following steps that firstly, a directional drilling machine is used for vertically drilling a grouting hole downwards; secondly, a plurality of steel floral tubes are sequentially put down in the three-opening first branch grouting hole; thirdly, cement-bentonite-based sleeve shell materials are continuously injected into the first section of the steel floral tube to the inner bottom of a first branch grouting hole of the three-opening hole, and an annular space between the first branch grouting hole of the three-opening hole and the steel floral tube string is filled with the cement-bentonite-based sleeve shell materials; fourthly, a packer is lowered to the bottom of the three-opening first branch grouting hole; a packing section is formed in front of the packer; and fifthly, cement grout is injected into the grouting pipe, grouting is conducted on the packing section, the finally-set cement-bentonite-based casing material is split and damaged under the effect of grouting pressure, and the grouting grout is injected into the stratum to be reinforced through the grout channel. According to the method, the hole collapse phenomenon when the grouting hole penetrates through the unfavorable geological section can be prevented, the grouting stopping effect of the packer is guaranteed, and retreating type segmented grouting construction is guaranteed.

The invention relates to a camera module assembly method and camera module assembly equipment. The camera module assembly method is applied to the camera module assembly equipment, the camera module assembly equipment comprises a first multi-dimensional correction module, a second multi-dimensional correction module and a mover platform, the first multi-dimensional correction module and the second multi-dimensional correction module are arranged on the mover platform, the first multi-dimensional correction module comprises a lens suction nozzle, and the second multi-dimensional correction module comprises a lens suction nozzle. The lens suction nozzle is provided with a first open hole and a plurality of second open holes formed along the peripheral side of the first open hole; the camera module assembly method comprises the following steps: sucking a lens through a lens suction nozzle; assembling the lens into the motor chip assembly by adjusting the first multi-dimensional correction module or the second multi-dimensional correction module; performing active alignment on the lens and the motor chip assembly; injecting glue from the plurality of second openings through a dispensing structure on a dispensing station so as to bond the lens and the motor chip assembly to obtain a camera module; therefore, the assembly tolerance of the camera module is reduced, and the dispensing quality is improved.

The invention discloses a TBM construction tunnel unfavorable geological tunnel section ground pre-reinforcement method which comprises the following steps: S1, a tunnel surrounding rock category map is compiled, and surrounding rock categories and stake numbers are marked on the map; s2, the surrounding rock confirmed to be in the V type is rechecked as a target reinforcing area; s3, directional grouting drill hole arrangement; s4, drilling design is conducted in combination with the tunnel excavation design drawing and the drilling task book; s5, drilling equipment is selected; s6, drilling equipment is installed; s7, designing and installing a grouting system; s8, drilling an orifice section; s9, drilling a vertical section; s10, drilling in a deflecting section; s11, horizontal grouting section drilling is carried out; s12, horizontal section bare hole grouting is conducted; s13, lowering a floral tube; s14, grouting the floral tube; s15, the grouting effect is checked; and S16, hole sealing is conducted. Advanced reinforcement grouting is conducted on the tunnel surrounding rock on the earth surface through drilling, the physical and mechanical parameters of the tunnel surrounding rock are improved, the risk of engineering geological problems during tunnel excavation is reduced, and the tunnel construction efficiency is improved.

A vibration damping device for a head-up display driving module, the device comprising: a power generating unit configured to a first damper having a predetermined thickness based on a shape corresponding to a motor mount to which a motor is fixed and a second damper fitted into an open hole of a damper mount disposed on top of the motor mount; and a power transmission unit configured to transmit power of the motor by rotating a lead screw extended and coupled to a rotating shaft of the motor.

The invention discloses a center control suspension screen supporting structure, an instrument panel assembly and a method, solves the problem that the stability of connection between a center control suspension screen and an instrument panel assembly in the prior art affects the mode of the center control screen, and has the beneficial effect of improving the mode of the center control screen. Comprising a central control screen mounting frame, the central control screen mounting frame and a central control screen are integrated, the central control screen mounting frame is inserted into a connecting support and is fixedly connected with the connecting support, the connecting support is provided with a first convex part, the first convex part extends in the direction away from an instrument panel cross beam component and is hollow, and the central control screen mounting frame is provided with a second convex part. The connecting support is provided with a plurality of first open holes so that the connecting support can be connected with the instrument board body framework through the first open holes, and the connecting support is provided with a plurality of second open holes so that the connecting support can be connected with the instrument board body framework and the instrument board beam component through the second open holes.

The invention discloses an assembly type ocean suction type caisson foundation structure and a construction method thereof, and belongs to the field of caissons, the assembly type ocean suction type caisson foundation structure mainly comprises a caisson assembly, the caisson assembly comprises a plurality of sets of assembly type caisson bodies, reinforcing steel bars are fixedly installed in the caisson bodies, open holes are formed in the caisson bodies, oblique openings are formed in the bottoms of the caisson bodies, and the caisson bodies are fixedly installed in the open holes. According to the fabricated ocean suction type caisson foundation structure and the construction method thereof, the bionic plates and the caisson body can enter the sea together, so that the holes can make contact with seawater, and therefore the bionic plates simulate the reef environment through the holes; according to the caisson, a habitat is provided for marine organisms, a food chain is constructed, an ecological chain is repaired, biological diversity is improved, wave force can be weakened, base scouring can be reduced, structural fatigue damage can be reduced in engineering, meanwhile, a protective layer is formed through biological attachment, and caisson durability is improved.

The invention is suitable for the technical field of solar cells, and provides a cell module and a photovoltaic system, and the cell module comprises a back contact cell which comprises a first polarity grid line and a second polarity grid line; the plurality of first welding strips and the plurality of second welding strips are respectively connected with the first polarity grid line and the second polarity grid line; the insulating strip is arranged on the sides, deviating from the back contact battery, of the first welding strip and the second welding strip, and the insulating strip comprises a through hole; the bus bar is arranged on the side, away from the back contact battery, of the insulating strip, the bus bar is electrically isolated from the first welding strip through the insulating strip, and the bus bar is electrically connected with the second welding strip through the through hole; wherein the insulating strip is a flexible insulating strip and comprises an open hole part and a non-open hole part, the through hole is located in the open hole part, and the thickness of the open hole part is larger than that of the non-open hole part. According to the flexible insulating strip, the thicker opening part is arranged in the flexible insulating strip, so that a buffering effect is achieved during welding and subsequent lamination, and the risk of subfissure and fragment is reduced.

The invention relates to an automatic positioning and cutting device for tunnel section steel arch web trepanning, and belongs to the technical field of arch cutting equipment. The device comprises a conveying mechanism and a positioning and cutting mechanism, the conveying mechanism is used for conveying an arch frame, the positioning and cutting mechanism comprises a positioning assembly, a linkage assembly and a cutting assembly, the positioning assembly is arranged in front of the cutting assembly in the conveying direction of the arch frame, and the linkage assembly is connected with the positioning assembly and the cutting assembly. The lowest height of the positioning assembly is lower than that of the cutting assembly, the weight of the positioning assembly is larger than that of the cutting assembly, the positioning assembly comprises a first inclined face, and when the arch frame is conveyed in the conveying direction, a flange plate of the arch frame can abut against the first inclined face and slide relatively to push the positioning assembly to move upwards by a preset distance; the positioning assembly moves upwards to drive the cutting assembly to move downwards to be close to the web through the linkage assembly, and the cutting assembly is used for cutting and trepanning the web of the arch frame. The method has the effect of improving the problem of poor positioning precision and reliability of trepanning of the web of the arch center.

The invention belongs to the technical field of batteries, and discloses an insulating film assembly and a battery, the insulating film assembly is connected with a pole group, the insulating film assembly comprises an insulating film body and a side plate, the pole group is coated with the insulating film body, and a positioning piece is arranged on one side of the insulating film body; positioning holes are formed in the positions, corresponding to the positioning pieces, of the side plates, and the positioning pieces are clamped in the positioning holes so that the side plates can be connected with the insulating film body. Thus, the positioning piece is arranged on the insulating film body and is clamped with the positioning hole, so that the connection stability between the insulating film body and the side plate can be improved, preliminary positioning of the side plate is facilitated, the step of opening the hole in the insulating film body is omitted, the insulating film body and the side plate can be tightly attached, and the gap between the insulating film body and the side plate is reduced; and the electrolyte is prevented from leaking and corroding the shell and the anti-explosion valve.

The utility model relates to the field of teaching aids, in particular to a chalk eraser cleaning device. The dust collector comprises an outer shell, a vibration assembly and a dust storage box. A cover plate is arranged at the top of the outer shell, a cavity and a partition layer arranged on the cavity are arranged in the outer shell, a through hole is formed in the partition layer, a containing groove communicated to the cavity is formed in one side of the outer shell, and the dust containing box is arranged in the containing groove and located below the partition layer; the vibration assembly comprises a vibration motor, a transmission rod piece and a chalkboard eraser fixing piece, the vibration motor is fixedly arranged at the top of the cover plate, the chalkboard eraser fixing piece is arranged at the bottom of the cover plate, the transmission rod piece penetrates through the open hole, one end of the transmission rod piece is connected with the vibration motor, and the other end of the transmission rod piece is connected with the chalkboard eraser fixing piece; when the vibration motor is started, transmission is conducted through the transmission rod piece, and under the driving of kinetic energy of the vibration motor, the chalk eraser fixing piece impacts the separation layer up and down. Through the device, chalk dust on the chalk eraser can be effectively prevented from overflowing when being knocked, and the safety of a human body is guaranteed.

The utility model provides a supporting column dismounting and mounting structure and a mobile workstation, the supporting column dismounting and mounting structure comprises a mounting base, a pressing and holding part and a locking assembly, and the mounting base can be mounted on a mounting object; one end of the hold-down part is connected to the mounting base, the other end of the hold-down part is provided with a connecting end, and the hold-down part and the mounting base can define a mounting hole; the locking assembly comprises a locking wrench and a connecting part, the connecting end is provided with an open hole, the connecting part can penetrate through the open hole, one end of the connecting part is connected with the mounting base, the other end of the connecting part is movably connected with the locking wrench, and the locking wrench can press the connecting end to move so that the pressing part can press the supporting column in the mounting hole. According to the mobile work station, a user can complete locking and unlocking of the mounting base and the supporting column by pulling tightly or pulling away the locking wrench, operation is easy, and the user can conveniently and rapidly disassemble, assemble and move the work station.

The invention discloses a natural draft cooling tower and a lattice type concrete filled steel tube cross strut thereof, the lattice type concrete filled steel tube cross strut comprises four lattice columns and cross nodes, the end parts of the lattice columns are on the same plane and are connected with the cross nodes to form an X-shaped structure, and each lattice column comprises a concrete filled steel tube column limb and a web member for connecting the adjacent concrete filled steel tube column limbs; the cross joint comprises two joint branch assemblies and a joint belly assembly connected with the two joint branch assemblies, and each joint branch assembly comprises a joint panel, a first covering panel and a second covering panel, wherein the first covering panel and the second covering panel cover the joint panel. The joint face plate comprises a joint top plate, a joint bottom plate, a joint stiffening plate and a reinforcing ring plate, the joint stiffening plate and the reinforcing ring plate are arranged between the joint top plate and the joint bottom plate, and open holes are formed in the joint top plate, the joint bottom plate and the reinforcing ring plate and used for concrete pouring and circulation. And the four latticed columns are arranged at the holes of the node top plates and the node bottom plates of the two node branch assemblies. The use amount of strut steel and concrete is reduced, and the construction speed and the construction quality are improved.

The invention relates to the technical field of server heat dissipation, and discloses a fresh air and cold plate type liquid cooling integrated server which comprises a cabinet body, filter cavities are formed in the two sides of the cabinet body, fan frames are symmetrically arranged on one side of the cabinet body, fan frames are fixedly arranged on the inner walls of the fan frames, and a plurality of fan blades are arranged in the middle of the fan frames. The fan frame penetrates through the outer wall of the cabinet body and is arranged in the filtering cavity, a filtering plate is arranged in the filtering cavity of the cabinet body, a plurality of filtering holes are formed in the outer wall of the filtering plate, a plurality of open holes are symmetrically formed in the inner wall of the cabinet body, and the open holes of the cabinet body are provided with screens. Through integration of two modes of fresh air direct air cooling and cold plate type liquid cooling, heat dissipation modes can be flexibly switched according to different environmental conditions and heat dissipation requirements of the server, efficient heat dissipation is achieved, and it is ensured that the internal temperature of the server is always kept within a reasonable range. The problem that the heat dissipation efficiency is poor under different weather conditions is solved.

The invention discloses a micro-mixing nozzle integrating heat pipe cooling and heat regeneration and a combustor, the micro-mixing nozzle comprises a heat pipe assembly I, a micro-mixing sleeve, an air mixing module and a fuel pipe, the micro-mixing sleeve, the air mixing module and the fuel pipe are coaxially arranged, and the heat pipe assembly I comprises a heat conduction ring, perforated fins, a heat pipe and heat pipe radiating fins; the overall combustor comprises a fuel cavity, an air cavity and a cooling cavity which are sequentially, coaxially and fixedly arranged at intervals from bottom to top, and a plurality of micro-mixing nozzles which are symmetrically arranged relative to the center of the overall geometric central axis are installed in the air cavity and the cooling cavity. According to the micro-mixing nozzle integrating cooling and backheating of the heat pipe and the combustor, the inlet area of the combustion chamber can be rapidly cooled, the service life of the combustor is prolonged, meanwhile, heat of the inlet area of the combustion chamber can be effectively utilized to preheat air, and the combustion efficiency is improved. The problem that the service life of an existing combustor is short due to thermal damage of a high-temperature backflow area to a micro-mixing nozzle can be solved.

Systems and methods for determining a diagenesis level in a reservoir for performing hydrocarbon extraction include receiving a set of open hole (OH) log data from one or more wells in the reservoir, the OH log data representing a subsurface of the reservoir; executing a diagenesis model to process the set of OH log data, the diagenesis model trained by thin-section image data correlated to labeled OH log data, the labeling identifying values for a quartz overgrowth rate (QOR), a clay coating rate (CCR), or a thin-section porosity in the subsurface based on a value in the OH log data; determining a prediction of a porosity of the reservoir, a permeability of the reservoir, or both the porosity and the permeability; and generating a control signal representing a recommendation to drill a well at a location in the reservoir.

The invention relates to the technical field of turbine shaft machining, and discloses a turbocharger turbine shaft machining device which comprises a machining bin and further comprises a visual door plate installed at an open hole formed in the front face of the machining bin and used for opening and closing the visual door plate and taking and placing the turbine shaft. The machining table is fixedly connected to the interior of the machining bin and used for machining the turbine shaft; the clamping mechanism is arranged above the machining table and used for clamping the turbine shaft; and the moving mechanism is arranged above the processing table. By arranging the clamping mechanism and adopting the scheme that a conical groove pushes a plurality of sets of push rods and clamping blocks to synchronously and radially move, high-precision automatic centering of the turbine shaft is achieved, it is guaranteed that the rotation center of a workpiece and the machining center strictly coincide, the machining roundness is guaranteed from the source, meanwhile, a first spring provides uniform clamping force, and the machining precision is improved. And deformation or surface damage of the thin-wall part possibly caused by a traditional rigid clamp is avoided, and rigid-flexible precise clamping is achieved.

The utility model provides a novel valve core pipe and a water faucet with the same. Comprising an installation base, a valve element pipe body arranged at the lower end of the installation base, a containing cavity formed in the installation base, located at the upper end of the valve element pipe body and used for containing a control valve element, and a water inlet hole formed in the lower end face of the valve element pipe body. The water inlet channel is formed in the valve element pipe body and communicates with the containing cavity and the water inlet open hole. The water storage cavity is formed in the mounting base in the circumferential direction and located on the circumferential side of the upper end of the valve element pipe body. The communicating channel is formed in the valve element pipe body and communicates with the containing cavity and the water storage cavity. And the water outlet is formed in the side end surface of the mounting seat and is communicated with the water storage cavity.

The invention discloses a self-drilling anti-floating anchor drilling tool structure with a self-adaptive positioner and a construction method, solves the problem that in the prior art, the forming quality is affected by structural arrangement in the drilling process of an anti-floating anchor, and has the beneficial effects that wall protection and muck removal are achieved, grouting can be achieved, and centering positioning is kept in the grouting process. According to the specific scheme, the self-drilling anti-floating anchor rod drilling tool structure with the self-adaptive positioner comprises a pile casing, one end of the pile casing can be connected with a drilling machine, a front-end drill crown is detachably arranged at the other end of the pile casing, open holes are formed in the side wall of the pile casing, spiral blades are annularly arranged on the pile casing, and a plurality of anchor rod steel bars are arranged in the pile casing; one end of each anchor rod steel bar abuts against the front-end drill crown, the other end of each anchor rod steel bar is arranged to exceed the pile casing, the self-adaptive positioners are arranged in the length direction of the anchor rod steel bars at set intervals, the self-adaptive positioners are located in the pile casing, the self-adaptive positioners are arranged on the peripheral sides of the anchor rod steel bars, and the self-adaptive positioners are fixedly connected with the anchor rod steel bars.

The invention discloses a construction method for salt cavern slim hole drilling cavity detection and injection and production well transformation. The construction method mainly comprises the six steps of cavity detection operation, packing operation, conduit operation, first-time reaming and well cementation, second-time reaming and well cementation and third-time open hole cavity penetrating operation. Compared with the prior art, the construction method for detecting the salt cavern slim-hole drilling cavity and transforming the injection and production well has the advantages that the drilling cost input is reduced, the working period is shortened, meanwhile, deflection and borehole wall instability are effectively avoided, and the construction safety is improved.

The invention discloses an open hole vertical well fracturing crack position identification method based on density clustering, which belongs to the technical field of hydraulic fracturing, and comprises the following steps: collecting a water hammer signal at the moment of pump stop by using a high-frequency pressure monitor; performing filtering processing on the signal by using an FIR filter; carrying out deconvolution processing on the filtered signal by adopting a cepstrum analysis method, and extracting crack reflection characteristics; determining the position of a liquid inlet point by combining an impedance identification technology; and performing dynamic analysis by using a density clustering method according to the determined liquid inlet point position, and identifying the crack number and the main body position based on the liquid inlet point space density. By the adoption of the method, the spatial distribution of the liquid inlet points is obtained through water hammer signal processing, the spatial density of the liquid inlet points is analyzed based on the density clustering analysis method, and therefore crack position recognition in the complex liquid inlet process such as vertical well open hole fracturing is achieved.

The invention relates to the technical field of open hole packers, and discloses a large-reaming-rate rubber sleeve which comprises a central pipe and further comprises a rubber sleeve body, a first sleeve and a second sleeve, and the rubber sleeve body is of a single integrated structure and arranged on the outer side of the central pipe in a sleeving mode; the two shroud rings are respectively fixed at the axial interval positions of the outer surface of the rubber sleeve, and the two shroud rings form a restraining and separating effect on the rubber sleeve, so that the rubber sleeve forms continuously distributed sealing bulges in the three sealing sections in the setting process; the back ring is arranged at the axial end of the rubber sleeve and matched with the rubber sleeve, a plurality of gap holes are distributed in the surface of the back ring, and the back ring synchronously and radially expands along with the rubber sleeve in the setting process and is adaptively attached to the open hole well wall through deformation of the gap holes, so that a stable supporting face is constructed for the rubber sleeve. The rubber sleeve with the large reaming rate aims at solving the problems that in the prior art, under the large reaming well condition, a rubber sleeve is insufficient in sealing capacity, lacks multiple sealing structures and is prone to being damaged in the tripping-in process.

The utility model provides a locking protection device for a machine tool fixture positioning plate. The locking protection device comprises a stand column arranged in a machine tool, a height-adjustable platform arranged on one side of the stand column, a positioning plate placed above the platform, a boss arranged on one side above the positioning plate, and an open hole formed in the boss and used for a guide rod to penetrate through. One end of the guide rod is connected with a fixed block, and the fixed block is connected with a movable block through a connecting bolt; a guide rod clamping block in contact with the guide rod is embedded in the boss of the positioning plate, and a stand column clamping block in contact with the stand column is embedded in the movable block. The guide rod clamping block and the stand column clamping block which are in contact with the guide rod and the stand column are arranged, so that the positioning plate can be locked and fixed under the action of the fixing bolt; when the corresponding fixing bolts are unscrewed, the positioning plate can rotate around the stand column and move in the length direction of the guide rod, the positioning plate can move at any position above the platform, convenience and rapidness are achieved, and the use safety is higher.

The utility model provides a variable damping force viscous damper which comprises a cylinder barrel, bushings connected to the two ends of the cylinder barrel, a piston movably arranged in the cylinder barrel, a piston rod penetrating through the center of the piston, with the two ends penetrating through center holes of the bushings and extending outwards, and damping fluid filled in a closed cavity defined by the cylinder barrel, the bushings, the piston and the piston rod. An annular outer gap is formed between the outer wall of the piston and the inner wall of the cylinder barrel, the variable-diameter guide rod is arranged in an open hole of the piston in a penetrating mode, and the two ends of the variable-diameter guide rod are fixedly arranged on the lining in an inserted mode. The inner diameter of the open hole is larger than the outer diameter of the first rod body and the outer diameter of the second rod body, and when the piston moves to the first rod body and the second rod body, a first annular inner gap and a second annular inner gap which are different in width can be formed between the inner wall of the open hole and the outer wall of the variable-diameter guide rod, so that the overflowing area of a damping liquid flowing channel is changed, and the variable damping force effect is achieved.

The utility model provides a metal insert which is applied to a plastic shell of a connector, an inner hole of the metal insert is not provided with threads, and the metal insert is suitable for being embedded in an open hole of the plastic shell of the connector. The utility model also provides a connector, wherein the metal insert is embedded in the opening of the plastic shell of the connector.

A monitoring system for monitoring a geological formation includes a casing of an injection well, wherein the casing is configured to extend through an open hole of the geological formation to define an annular space between the casing and the open hole, and wherein the casing includes a mandrel circumscribing at least a portion of the casing, and one or more monitoring lines configured to monitor the geological formation for the presence of carbon dioxide, wherein the one or more monitoring lines are at least partially integrated with the mandrel.

The invention provides a preparation method of a 3D printing composite material, which comprises the following steps: S10, providing a 3D printing skeleton which is printed by adopting a first thermoplastic material and has a three-dimensional communicated open pore structure, and reserving a layer grain structure formed in the printing process on the surface of the 3D printing skeleton; s20, the 3D printing framework is placed in a constant-temperature environment of 70-90 DEG C and kept dry; s30, the heated 3D printing framework is moved into a cavity of an injection mold, the mold is closed, and the temperature of the cavity of the injection mold is set to be 30-60 DEG C; s40, a molten second thermoplastic material is injected into the cavity, so that the second thermoplastic material wraps the 3D printing framework and fills the groove of the layer grain structure; the shore hardness of the second thermoplastic material is lower than that of the first thermoplastic material, and the softening temperature of the first thermoplastic material is higher than the melt injection temperature of the second thermoplastic material. According to the 3D printing composite material prepared by the preparation method, the problem that the comfort degree of an existing 3D printing insole is relatively low can be solved.

The invention relates to the technical field of oil and gas well completion tools, and discloses an anti-resistance open hole packer which comprises a central pipe and a rubber sleeve arranged outside the central pipe in a sleeving mode, and further comprises a double-piston setting mechanism arranged on the central pipe in a sleeving mode and defining a pressure-bearing cavity, one end of the double-piston setting mechanism abuts against the end of the rubber sleeve, and the other end of the double-piston setting mechanism abuts against the end of the rubber sleeve. Axial thrust is generated by receiving high-pressure liquid conducted in the center pipe, and the rubber barrel is extruded to deform in the radial direction and be attached to the open hole well wall. And the lower piston assembly is arranged in a pressure-bearing cavity between the central pipe and the double-piston setting mechanism, firstly moves in the direction far away from the rubber barrel under the action of high-pressure liquid, relieves the pre-locking state of the double-piston setting mechanism and then drives the double-piston setting mechanism to move in the direction of the rubber barrel. The open hole packer capable of preventing resistance encountering aims at solving the problems that a setting mechanism is started in advance and set accidentally due to resistance encountering in the process that an existing open hole packer goes into a well, and the existing open hole packer cannot reach a preset packing position accurately.

The invention relates to the technical field of drip irrigation under plastic film, in particular to a fertilizer and water integrated agricultural drip irrigation device under the plastic film mulching condition, which comprises a base, the upper end of the base is fixedly provided with a mixing barrel and a water pump in sequence from front to back, and the water inlet end of the water pump is communicated with the bottom end of the mixing barrel through a water pipe; the water inlet end of the water pump communicates with a main pipe through a water pipe. For different distances among multiple ridges on different lands, matching can be achieved by adjusting the front and back positions of the branch pipes, it is ensured that the branch pipes can be accurately laid on the ridges, holes do not need to be formed outside the main pipe, operation is convenient, and damage to the main pipe is avoided. The branch pipe can be quickly and simply disassembled and assembled on the main pipe, that is, quick separation and quick connection between the branch pipe and the main pipe can be realized, the round pipe can be automatically blocked by separation so as to avoid water loss, water can quickly flow into the branch pipe after connection so as to realize quick dripping of the drip irrigation head, the sealing performance can also be ensured, and the operation is convenient.

A grinding apparatus has a grinding wheel fastened to a mount disk connected a spindle by a plurality of bolts. The mount disk has at least three threaded holes and a plurality of protrusions protruding from a mount surface thereof. Each of the bolts includes an externally threaded shank, a neck coupled to the externally threaded shank, and an engaging flange coupled to the neck and extending radially outwardly. The grinding wheel includes an annular open hole defined in a mating surface of an annular base for mating with the mount surface, an annular slot that is wider than the annular open hole and is fluidly connected to the annular open hole, at least three insertion holes in the annular open hole for allowing the engaging flange to be inserted into the annular slot, and a plurality of protrusion insertion holes for receiving the engaging flanges of the bolts.