736 results about "External pressure" patented technology

The invention discloses a sealing silica gel ring anti-cracking performance detection device, and relates to the silica gel ring performance detection field, the sealing silica gel ring anti-cracking performance detection device comprises a detection table, a cylinder body and an external pressing mechanism, the external pressing mechanism comprises a U-shaped frame body and a pushing assembly, the inner side of the U-shaped frame body is provided with an accommodating groove, the pushing assembly comprises a connecting rod, one end of the connecting rod is rotatably connected with the U-shaped frame body, and the other end of the connecting rod is rotatably connected with the cylinder body; the other end of the connecting rod is rotationally connected with pushing wheels, and the two pushing wheels push the silica gel ring to enable the silica gel ring to arch outwards. Through the arrangement of the external pressure mechanism, the symmetrically distributed pushing wheels can hunch up part of the area of the silica gel ring, so that the crack detection capability is enhanced, closed or microscopic cracks on the surface of the silica gel ring can be effectively expanded, and the cracks are obviously amplified in the hunched parabola-like area; the silica gel ring is driven to roll continuously in the circumferential direction by combining the composite motion of rotation and axial movement of the barrel, it is ensured that the whole surface of the silica gel ring is subjected to the stretching and arching process, and a blind area of traditional single-point detection is eliminated.

The invention discloses a pressure detection system, and relates to the technical field of intelligent wearing, and the pressure detection system comprises 1) a flexible substrate layer which is used for fitting skin and sensing external tiny pressure changes; the micro-column array layer is composed of a plurality of micro-column structures and used for amplifying and conducting the pressure change sensed by the flexible substrate layer; the flexible gel sensing layer is used for receiving the pressure transmitted by the micro-column array layer and generating an electric signal; 4) a packaging layer; an interdigital electrode layer is arranged in the flexible gel sensing layer, an electric signal of the flexible gel sensing layer changes along with the change of external pressure, and the detection of a pressure electric signal is realized through the interdigital electrode layer. By means of the design, high-sensitivity response to tiny pressure changes can be achieved, micro-pressure signals are remarkably amplified, meanwhile, the problem of hysteresis effect generally existing in traditional silica gel or metal film materials is solved, and therefore the response speed of the sensor is greatly increased.

The utility model relates to the technical field of oil field underground oil extraction tools, and discloses a deep well fracturing packer rubber sleeve, which comprises an outer layer flexible sealing ring, an inner layer flexible sealing ring, an inner layer flexible sealing ring and an outer layer flexible sealing ring, and the outer layer flexible sealing ring is used for adapting to the surface of a well wall and realizing sealing; the middle composite buffer layer is used for buffering external pressure and absorbing stress generated by expansion; the inner-layer rigid supporting framework is used for providing structural support and limiting the expansion range of the rubber sleeve; the outer layer flexible sealing ring is of a gradient type flexible protruding structure. According to the utility model, the outer-layer flexible sealing ring adapts to an irregular well wall and realizes tight sealing through a gradient structure and micro lines, the middle composite buffer layer absorbs external pressure and disperses expansion stress, the anti-fatigue capability of the rubber sleeve is enhanced, and the inner-layer rigid supporting framework controls deformation through the supporting ribs and the compensation grooves; and the long-term stability of the rubber sleeve under high-pressure and high-temperature conditions is ensured.

In some embodiments, a pressure sensor may comprise a housing, a flexible membrane which, together with the housing, forms a hermetically closed cavity, a sensor element arranged in the hermetically closed cavity, and a gaseous medium in the hermetically closed cavity. The sensor may detect a change in a physical property, of the flexible membrane, associated with an external pressure pressing inward into the flexible membrane of the hermetically closed cavity.

The invention provides an integrated pressure protection double-layer corrugated pipe vibration reduction pipe, and belongs to the field of vibration absorbers. An interlayer cavity is formed in the pipe wall of the vibration reduction pipe; gap grooves are formed in the middles of the outer end faces of the flange plates, so that steps are formed on the outer end faces of the flange plates around the edge portions of the gap grooves, and inlet holes and outlet holes are formed in the gap grooves of the two flange plates respectively. The safety valve and the one-way valve are arranged in the interlayer cavity and connected to the inlet hole and the outlet hole, the safety valve allows or limits the medium to enter the interlayer cavity through the inlet hole according to whether the external pressure exceeds the preset pressure, and the one-way valve limits the medium to flow out of the interlayer cavity only through the outlet hole. The safety valve is arranged, so that a medium in the inner layer of the pipeline enters the interlayer cavity, the pressure value in the inner layer of the pipeline is reduced, the pressure of the medium is prevented from exceeding the yield limit of an inner-layer corrugated pipe material, and the medium entering the interlayer cavity can flow back to a low-pressure area through the one-way valve; and the safety and the reliability of the double-layer corrugated pipe vibration reduction pipeline are improved.

The invention provides a resonant pressure sensor with adjustable measuring range and sensitivity, and relates to the technical field of sensors, and the resonant pressure sensor comprises a pressure sensitive film which is used for detecting external pressure; the resonator layer comprises a double-end clamped resonant beam, the double-end clamped resonant beam is arranged above the pressure sensitive film, a movable part of the double-end clamped resonant beam is suspended, one side of the double-end clamped resonant beam is provided with two driving electrodes for applying an alternating current driving signal and a parameter pumping alternating current signal respectively, and the other side of the double-end clamped resonant beam is provided with two detection electrodes; the silicon sealing cover layer is provided with a resonant cavity, and the resonant cavity is located above the pressure sensitive film and the double-end clamped resonant beam and used for providing a deformation space for the pressure sensitive film and providing a vibration space for the double-end clamped resonant beam; in the first working mode, the first-order mode of the resonant beam is split into two amplitude peak values by applying a parameter pumping alternating current signal, and the sensitivity of the output amplitude ratio is adjusted by adjusting the amplitude of the parameter pumping alternating current signal; the measurement range is adjusted by adjusting the frequency of the parameter pumping alternating current signal.

The invention relates to the field of aircrafts, and discloses a sandwich-structured composite material mute paddle, which comprises a paddle blade, and the paddle blade is a sandwich carbon fiber laminated structure composed of an upper layer prepreg laying layer unit, a foam sandwich layer and a lower layer prepreg laying layer unit; the upper-layer prepreg laying unit and the lower-layer prepreg laying unit are each of a bionic spiral structure formed by stacking multiple layers of composite material prepreg sheets in a bionic spiral laying sequence. The invention further discloses the preparation method of the composite material mute paddle of the sandwich structure. Load can be effectively transmitted and dispersed along fiber paths in different directions in the outer-layer prepreg bionic spiral structure, so that the comprehensive rigidity, the torsional property and the damage tolerance of the paddle are improved, the material characteristics are optimized, a three-section type pressurization method is adopted, a stable external pressure environment is established in the early stage of paddle foaming, and the mechanical performance of the paddle is improved. And dynamic balance and collaborative forming of internal and external pressure in the paddle forming process are achieved.

The utility model relates to an energy storage device and an energy storage system. The energy storage device comprises a box body and a battery, the box body comprises a plurality of wall plates, and the wall plates are connected and define a containing cavity; the battery is arranged in the accommodating cavity; wherein at least one wall plate is provided with a pressure relief part, and the pressure relief part and the wall plate are integrally formed; the pressure relief part is provided with a first notch groove, and the pressure relief part is configured to be capable of cracking along at least one part of the first notch groove so as to open the pressure relief part. According to the energy storage device, the pressure relief function is integrated on the wall plate, so that the box body has the pressure relief function, the use of an external pressure relief plate can be reduced, the purchase and installation requirements of equipment are reduced, the purchase and maintenance cost is reduced, the material and manufacturing cost is reduced, the overall cost is reduced, meanwhile, the installation process is simplified, the maintenance complexity is reduced, and the production efficiency is improved; and the pressure relief part can directly respond to the pressure change in the box body, so that the pressure relief efficiency can be improved, the explosion risk can be reduced, and the safety of the energy storage device can be improved.

The utility model discloses a pressure-resistant MPP electric power pipe, which comprises an inner pipeline and a buffer pressure-resistant outer pipe, the buffer pressure-resistant outer pipe is sleeved on the outer wall of the inner pipeline, the buffer pressure-resistant outer pipe comprises a connecting pipe and a protective pipe, the connecting pipe is slidably connected on the outer wall of the inner pipeline, a buffer cavity is formed between the protective pipe and the outer wall of the connecting pipe, and the protective pipe is sleeved on the buffer cavity. A plurality of evenly-distributed arc-shaped buffer plates and buffer pipes are fixedly connected into the buffer cavity, the arc-shaped buffer plates are arranged at equal intervals and fixedly connected with the outer wall of the connecting pipe, the outer surfaces of the arc-shaped ends of the arc-shaped buffer plates abut against the inner wall of the protective pipe, and the buffer pipes are arranged between every two adjacent arc-shaped buffer plates. The buffer pipes are fixedly connected with the two adjacent arc-shaped buffer plates and abut against the inner wall of the protection pipe. The arc-shaped buffer plates and the buffer pipes which are uniformly distributed are arranged in the buffer cavity, so that external pressure borne by the protective pipe can be effectively absorbed and dispersed, and deformation and fracture caused by the fact that the local part of the inner pipeline suffers from the external pressure are reduced.

The invention relates to the technical field of plastic track materials, and discloses an environment-friendly anti-skid plastic track material and a preparation method thereof, the environment-friendly anti-skid plastic track material comprises the following raw materials by mass: 50-55 parts of hyperbranched polyethylene, 10-15 parts of an anti-skid wear-resistant filler, 5-8 parts of a plastic flexibilizer, 45-50 parts of an inorganic filler, 1-2 parts of a plastic foaming agent, and 1-2 parts of a dispersant. The anti-skid and wear-resistant filler can generate large resistance in the plastic track material, increase the friction coefficient, enhance the anti-skid capacity of the plastic track material, effectively disperse pressure, reduce local wear and improve wear resistance, and in addition, the anti-skid and wear-resistant filler can form a network structure capable of absorbing and weakening external pressure in the plastic track material, so that the anti-skid and wear-resistant performance of the plastic track material is improved. The impact resistance and the bearing capacity of the plastic runway can be enhanced, so that the plastic runway is not easy to crack or break under the action of external force.

The utility model provides a small-diameter six-arm caliper which comprises an upper connector used for connecting adjacent short sections, a balance part used for keeping balance of internal and external pressure, a driving part used for providing power, a lead screw part used for converting rotating power into linear motion, a pushing part used for outputting pushing force and a measuring part used for synchronously opening and closing measuring arms according to the magnitude of the pushing force, the upper connector comprises an upper connector shell, and a multi-core plug and a board clamping frame for installing a circuit board are installed in the upper connector shell. According to the utility model, the circuit control part is separated from the controlled motor part, so that the space occupied by the driving part is reduced, and the radial arrangement is reduced by connecting all parts step by step, so that the diameter of the whole caliper is reduced, and finally, the purpose of measuring the small-diameter hole diameter of 3.6 inches is achieved.

The invention discloses a plate bending machine for stainless steel plate machining, and relates to the technical field of plate bending. According to the plate bending machine for stainless steel plate machining, through the design of the bending device, a plate is placed on the bending table, a hydraulic column drives a buffering mechanism to extrude an auxiliary rod, the auxiliary rod drives a bending block to extrude towards one side of a bearing mechanism, and therefore the effect of bending the plate is achieved; the buffering mechanism plays a role in damping and buffering, so that the extrusion force is reduced, excessive extrusion of parts is avoided, instantaneous impact is buffered, the bearing mechanism plays a role in buffering in the pressing and shrinking process, impact of external pressure on the parts is reduced, and the service life of the parts is prolonged. And one side of the protection table is scoured through the pneumatic device, so that the effect of cleaning impurities on the surfaces of the parts is achieved.

The present invention discloses a hollow shell PDMS flexible pressure sensing device with an embedded planar inductive coil, comprising: a flexible backing, a hollow shell porous PDMS support body, and a mounting frame; the hollow shell porous PDMS support body is fixed to the upper limit of the flexible backing; a PI film that matches the flexible backing is adhered to the top of the hollow shell porous PDMS support body; and the outer sides of the flexible backing and the PI film are wrapped with radiation-proof cloth. The present invention realizes the operation of rapid and automatic resetting of the support body and continuous pressure detection. When pressure gradually acts on the top of the porous PDMS support body, the entire sponge body is gradually compressed, so that the relative distance between the coils inside it gradually decreases, and the inductance value of the entire circuit increases accordingly. When the external pressure is gradually removed, the entire hollow shell porous PDMS support body gradually returns to its original shape under the action of elasticity. The present invention can achieve an ideal height, improve flexibility, and have good anti-interference ability, making the detection process more accurate and practical.

This invention relates to the field of composite pipe technology and discloses a coilable pipe. The pipe includes a core tube (20) with a uniform cross-section medium flow channel and a corrugated protective layer (10) sleeved on the outside of the core tube (20). The outer surface of the core tube (20) is fitted with the minimum inner diameter of the corrugated protective layer (10). The corrugated protective layer (10) includes at least a metal corrugated protective layer (11), an anti-corrosion layer (12), and a plastic outer protective layer (13) arranged from the inside out. Through the above technical solution, this invention improves the rigidity of the pipe by setting a corrugated protective layer on the outside of the core tube, increasing the pipe's axial tensile strength and resistance to external pressure, ensuring the roundness of the core tube, and preventing damage to the core tube during coiling, uncoiling, and laying. Furthermore, the corrugated protective layer in this invention provides a plastic outer protective layer on the outside of the metal corrugated protective layer and the anti-corrosion layer, further protecting the anti-corrosion layer and the metal corrugated outer protective layer.

The utility model relates to the technical field of inspection wells, and discloses an assembly type composite material inspection well which comprises an upper well body and a lower well body, a water inlet hole and a plurality of water outlet holes are formed in the side wall of the upper well body, and a second sealing ring and a first sealing ring are installed in each water outlet hole and each water inlet hole respectively. A water inlet pipe and a water outlet pipe are installed in the first sealing ring and the second sealing ring respectively, an upper well body is installed on the lower well body, a well lid is installed on the upper well body, a clamping groove is formed in the well lid, a sealing rubber ring is installed in the clamping groove, and the sealing rubber ring is installed between the upper well body and the well lid. Modular design and a multi-sealing structure are adopted, the structural strength is enhanced through flange connection and arrangement of the reinforcing ribs and the triangular supports, external pressure can be resisted, deformation can be prevented, all-directional sealing is achieved through combination of multiple sealing rings and sealant, it is guaranteed that the water meter is accurate in metering and equipment is safe, the construction period is greatly shortened through prefabrication and assembly construction, and the construction cost is reduced. The environmental influence is reduced and the equipment is convenient to overhaul and maintain.

The utility model relates to a bottom air suction chamber for a coating production line. The bottom air suction chamber comprises a shell, a high-pressure box fixed at the upper end of the shell, a vortex plate mounted in the high-pressure box, a filter box mounted at the lower end of the vortex plate, an air inlet pipe fixed at the lower end of the high-pressure box and an exhaust mechanism fixed on the side surface of the air inlet pipe, vortex can be generated at the air inlet through the specially designed vortex plate, the pressure intensity is reduced, and the entrainment effect is enhanced. Meanwhile, the air suction chamber is matched with the high-pressure box, the high-pressure box can eject high-pressure jet flow, surrounding fluid can be continuously drawn into the jet flow under the entrainment action of the jet flow, and as the internal pressure of the jet flow is smaller than the external pressure, air tends to move inwards at the top end of the jet flow and at the position where air energy is insufficient, and is sucked into the air suction chamber; by means of the design, air flow on the surface of the vortex plate can be accelerated, coating attached to the surface of the vortex plate is reduced, and meanwhile the air suction efficiency of the device can be greatly improved.

The utility model relates to the technical field of steel lining teflon pipelines, in particular to a high-strength interlayer heat preservation steel lining teflon pipeline which comprises steel pipes, one end of each steel pipe is provided with a first connecting flange through a bolt, and the first connecting flange is used for being connected with another set of steel pipes. A second connecting flange used for being connected with the other set of first connecting flanges is arranged at the end, away from the first connecting flanges, of the steel pipe, a protection mechanism used for protecting the steel pipe is arranged on the outer side of the steel pipe, and buffering mechanisms used for buffering external pressure are arranged on the inner side of the protection mechanism at equal intervals. In the using process, when the temperature of a medium in the pipeline changes, the heat preservation layer can effectively slow down the heat transfer rate, the heat preservation layer is made of the aerogel felt material, and the aerogel felt is an efficient heat preservation material, has extremely low heat conductivity and can effectively isolate heat transfer and keep the temperature of the medium in the pipeline. Heat loss is reduced, the temperature in the pipeline is kept stable, and the purpose of enhancing the heat preservation performance of the steel lining PTFE pipeline is achieved.

The utility model relates to the technical field of electromechanical equipment installation, in particular to double-limiting clamping equipment which comprises an installation panel, a first reverse lead screw is rotatably connected to the interior of the installation panel, first clamping pieces are slidably connected to the outer wall of the installation panel, an external connection positioning assembly is rotatably connected to one end of the top of the installation panel, and a second reverse lead screw is rotatably connected to the other end of the top of the installation panel. And a limiting groove is formed in the other end of the top of the mounting panel, and a movable vertical frame is slidably connected into the limiting groove. According to the improved clamping equipment, the external positioning assembly can rapidly achieve accurate butt joint with the pressure applying end of external pressure equipment, the tedious process of repeated adjustment of a traditional clamp is reduced, through sliding of the movable vertical frame and rotation of the extension frame, the position of the second clamping piece can be flexibly adjusted in space, work of the second clamping piece and work of the first clamping piece are coordinated, and the clamping efficiency is improved. The first clamping piece and the second clamping piece cooperate to complete positioning of the gear and the shaft rod or the bearing at a time, and the assembling efficiency is improved.

The invention discloses pure-phase bismuth ferrite-strontium titanate ceramic as well as a preparation method and application thereof, and belongs to the field of lead-free ferroelectric ceramic. Comprising the following steps: filling pure-phase BFO-STO precursor powder prepared by a hydrothermal method into a graphite mold, controlling the heating rate to a sintering temperature, and sintering under the conditions of external pressure and heat preservation, so as to finally prepare the BFO-STO ceramic. The BFO-STO ceramic is prepared through SPS sintering, volatilization of Bi < 3 + > and generation of impure phases are effectively inhibited, ferroelectric, dielectric and magnetic properties of the BFO ceramic are effectively improved, and possibility is provided for practical application of the BFO-STO ceramic in the fields of functional sensors, magnetic memories, piezoelectric generators, high-temperature inductors and the like.

This application provides a horizontal assembly and welding method for ultra-long cylindrical sections with circumferential seams, comprising: hoisting the long cylindrical section into a horizontal fixture and controlling the horizontality of the long cylindrical section and the coaxiality of the cylindrical section axis with the axis of the support mechanism; adjusting the roundness of the assembled cylindrical section by controlling the support tension of the inner support fixture and using an auxiliary local external pressure method; eliminating local misalignment after cylindrical section assembly by local positioning welding and local correction; and eliminating local gaps after cylindrical section assembly by in-situ milling of the cylindrical section end face and full positioning seam sealing welding, wherein the milling includes rough milling and fine milling. This application enables the horizontal assembly and welding of ultra-long cylindrical section propellant tanks for next-generation medium-sized launch vehicles with circumferential seams, solving the problem of deformation during horizontal assembly of thin-walled ultra-long weak rigid cylindrical section products, reducing product production costs, and improving product assembly and welding efficiency, providing effective technical support for a high-efficiency, mass production model for rocket propellant tank products.

The present invention relates to a method for preforming a composite material (I) into a plate shape, the composite material comprising reinforcing fibers bonded together, particularly by means of a plastic polymer material. Specifically, the method includes an intermediate molding stage (b) comprising at least the following operations: - introducing gas (III) into a second chamber (4) while the external pressure Pext equals atmospheric pressure, simultaneously maintaining the pressure P2 in the second chamber (4) below the external pressure Pext and, in particular, atmospheric pressure, and thus locally maintaining a distance between the upper membrane (2) and the lower membrane (1), and simultaneously maintaining the positioning and contact between the composite material (I) and the two membranes (1 and 2) in the contact area (5); - evacuating gas (III) contained in the first chamber (3) to press the lower membrane (1) onto the entire molding surface (22) present at the bottom (21) of the mold (20). The invention also relates to an apparatus suitable for carrying out this method.

The utility model relates to the technical field of cardan shaft testing, in particular to a cardan shaft testing device which comprises an upper pressing plate and a lower supporting plate, the upper pressing plate is located above the lower supporting plate, a second groove is formed in the middle of the lower end of the upper pressing plate, and second containing grooves are formed in the positions, in the middles of the two sides of the bottom of the second groove, of the lower end of the upper pressing plate. A first groove is formed in the middle of the top end of the lower supporting plate, and first containing grooves are formed in the middle of the two sides of the top of the first groove in the top end of the lower supporting plate. And applying pressure to the mandrel and the cardan shaft through external pressure equipment and a device until the molded surface of the cardan shaft is fractured, so that a cardan shaft shear test is completed, and finally cardan shaft performance test verification is completed. The whole test device is simple in structure and convenient to mount, dismount and operate during use, so that the whole test cost is lower, and the test device has higher practicability.

An embodiment of the present specification provides a pressure sensor comprising: a first capacitor formed by a first electrode on which a first conductive microstructure in contact with the first dielectric layer is arranged, a second electrode on which a second conductive microstructure in contact with the second dielectric layer is arranged, and a first dielectric layer between the first electrode and the second electrode; when the first electrode is close to the second electrode in response to external pressure, the first conductive microstructure deforms, and the deformation changes the first capacitance of the first capacitor and generates a sensing signal changing along with the first capacitance.

The self-driven sensor and bearing slip rate in-situ monitoring method disclosed by the specification relates to the technical field of bearing detection and comprises a ferroelectric PVDF film, an upper flexible electrode, a lower flexible electrode and a spacer. The ferroelectric PVDF film is bonded to the Cu electrode area on the upper surface of the lower flexible electrode. The spacer is arranged on the two sides of the ferroelectric PVDF film in the horizontal direction. The upper flexible electrode is bonded to the spacer. When subjected to external pressure, the upper flexible electrode is deformed to contact the ferroelectric PVDF film. The self-driven sensor and bearing slip rate in-situ monitoring method provided by the present application meets the requirements of non-interference, easy integration, self-power supply and high-precision monitoring for bearing slip rate monitoring, and realizes precise wireless in-situ monitoring of bearing slip rate.

A printing ink mixing and stirring device comprises a base, mixers are stacked on the base in the vertical direction, driving mechanisms are arranged on the mixers, every two adjacent mixers are connected and fixed through a connecting mechanism, the mixer located on the top layer and the driving mechanism are connected and fixed through a connecting mechanism, and stirring operation is conducted through the mixers. In the stirring process, generation of deep bubbles caused by a large amount of ink is avoided, in order to avoid air entering in the stirring process, formation of bubbles in the ink can be reduced or avoided in the mode that air in the mixer is continuously pumped away, in the air pumping process, the pressure intensity in the mixer is smaller than the pressure intensity of the outside, and the stirring speed is increased. The mixer is in a suction state all the time, so that air bubbles in the printing ink can be dissipated and discharged conveniently, air is prevented from entering the printing ink to form the air bubbles to a certain extent due to the fact that the content of the air in the mixer is low, the connecting mechanism can enable the two adjacent mixers to be assembled together in a sealed mode, and air suction operation is facilitated.

The utility model discloses a pressure-resistant shell of an LVDT displacement sensor, which comprises a pressure-resistant shell, a mounting piece is mounted at the front end of the pressure-resistant shell, a mounting shell is arranged in the pressure-resistant shell, the displacement sensor is inserted into a fixing sleeve, then the fixing sleeve is inserted into the mounting shell through a threaded structure of the mounting sleeve, the rear end of the fixing sleeve is contracted, and the pressure-resistant shell is formed. Therefore, the displacement sensor is extruded through the rear end of the fixing sleeve, the displacement sensor is fixed, the displacement sensor can be conveniently disassembled and assembled when needed, the connection strength between the pressure-resistant shell and the mounting shell can be remarkably enhanced through the arrangement of the pressure-resistant strip, the whole shell is more stable when bearing external pressure, deformation or damage is not prone to occurring, and the service life of the displacement sensor is prolonged. The pressure-resistant strip can uniformly disperse pressure applied externally to the whole shell, structural damage caused by overlarge local stress is avoided, the design is beneficial to prolonging the service life of the displacement sensor, and the reliability of the displacement sensor in a severe environment is ensured.

This invention discloses an extrusion device for outer protective tubes of buried cables, relating to the field of cable outer protective tube production technology, aiming to solve the problem of easy delamination in traditional double-layer co-extrusion structures. The key technical points are: for producing cable outer protective tubes with reinforced structures, the device includes a first extruder, a second extruder, and a forming die head; the forming die head is located at the discharge port of the first and second extruders. The first extruder provides a first polymer melt to form the tube matrix, and the second extruder forms a second polymer melt with reinforcing material. This invention, through the cooperation of a rotating mandrel and a tangential injection hole, allows the reinforcing melt to dynamically embed into the inner wall of the matrix in a helical trajectory, forming a continuous helical reinforcing rib structure. This structure significantly improves ring stiffness and resistance to external pressure without significantly increasing wall thickness and weight, and because of the one-piece molding, it solves the problem of easy delamination in traditional double-layer co-extrusion structures.

The invention discloses a control valve and a packer, and belongs to the technical field of oilfield development, the control valve comprises a pipeline assembly and a control assembly, a moving channel is formed in the pipeline assembly, and a closing position and an opening position are arranged in the axial direction of the moving channel; the control assembly comprises a sliding sleeve and an elastic piece, the sliding sleeve is in sliding connection with the moving channel, the elastic piece is arranged between the sliding sleeve and the opening position, and when external pressure is larger than internal pressure of the moving channel, the sliding sleeve moves to the opening position in the axial direction of the moving channel under the action of pressure and compresses the elastic piece, so that the control valve is opened; when the external pressure is smaller than the internal pressure of the moving channel, the elastic piece recovers deformation and drives the sliding sleeve to move to the closing position in the axial direction of the moving channel, and therefore the control valve is closed. The packer is provided with the control valve. Through the synergistic effect of the sliding sleeve and the elastic piece, the control valve can be opened and closed repeatedly, the operation efficiency is improved, and the use cost is reduced.

The utility model relates to an air cylinder pressing and feeding device of a sander. The air cylinder pressing and feeding device comprises a rack, the material pressing air cylinder is mounted on the upper rack and used for providing pressing force driven by constant air pressure; the limiting assembly is used for limiting the lifting height of the upper pressing roller; the guide mechanism is used for guiding when the upper pressing roller moves up and down; the upper material pressing roller is rotationally mounted on the upper rack and is guided by the guide mechanism, and the upper material pressing roller floats up and down along with the thickness change of the plate; the lower feeding roller is rotationally mounted on the lower rack, and a plate conveying space is formed between the lower feeding roller and the upper pressing roller; the air pressure output of the material pressing air cylinder is dynamically adjusted through an external pressure adjusting valve. The spring material pressing device has the advantages that the problems existing in a traditional spring material pressing mode are solved, and the spring material pressing device is stable and reliable in pressing force, accurate in lifting height control, suitable for plates of different thicknesses, capable of prolonging the service life of equipment, improving production efficiency and safety and the like.

The utility model belongs to the technical field of detection equipment, and particularly relates to a tubular product external pressure test tool. Comprising an outer box body which surrounds the sample pipe and is provided with a spacing part between the outer box body and the sample pipe; the supporting part comprises a first end connected with the outer surface of the sample pipe and a second end connected with the outer box body; the supporting part is used for positioning the sample pipe so as to maintain the spacing distance between the outer surface of the sample pipe and the outer box body; the packaging part, the outer box body and the outer surface of the sample pipe are matched to form at least part of the inner contour of the spacing part; and the guide pipe is arranged on the outer box body or the packaging part, and the spacing part is communicated to the voltage withstanding test equipment through the guide pipe. The device is a pipe external pressure test tool which can be matched with internal pressure test equipment, is good in compatibility with the internal pressure test equipment, is easy to obtain materials, is simple in installation mode, and has relatively low price cost and operation learning cost.