164 results about "Closed tube" patented technology

There is disclosed a bag having a tubular body with a top open end and a bottom closed end. The tubular body has a larger open diameter at the top open end. The tubular body narrows into a narrower open diameter adjacent to a bottom closed end. The tubular body in a flattened two-fold condition has a pair of side edges extending from a top edge to a bottom edge. The top edge delimits the top open end. The bottom edge delimits the bottom closed end. The pair of side edges are generally parallel to one another in a first portion adjacent to the top edge.

The invention relates to the technical field of solid-liquid filtering, in particular to a plastic flexibilizer mixed solid-liquid filtering device which comprises a supporting frame, a filtering piece arranged on the supporting frame, a power piece arranged on the outer wall of the filtering piece and an extrusion piece arranged on the lower portion of the filtering piece. The filtering piece comprises a material storage pipe arranged at the upper part of the supporting frame, and a sealing pipe is arranged at the lower part of the material storage pipe; the power part comprises a U-shaped pipe arranged on the outer wall of the material storage pipe, an ejector rod is arranged at the end of the U-shaped pipe, and an extension plate is arranged on the side wall of the ejector rod. The extrusion part comprises a closed circular plate arranged on the lower portion of the closed pipe, the ejector rod in the extending end of the U-shaped pipe is driven to move upwards through pressure generated when the filtering part is fed, the ejector rod moves upwards to drive the closed circular plate and the silo which are connected with the ejector rod to move upwards to extrude mixed materials inside, and the solid-liquid mixed materials are extruded forcibly to accelerate the filtering efficiency.

This application relates to a heat pipe energy pile and a heat pipe ground source heat pump system and its operation and management method, solving the technical problems of existing ground source heat pumps requiring additional power and consuming high energy, and being difficult to adapt to bidirectional energy supply in winter and summer. The system includes a pile foundation, heat pipes, a heat exchanger, and a heat pump unit. The heat pipe is integrated into the pile foundation and is a closed tube with a capillary wick, vacuumed, and filled with a phase change working fluid. It consists of an evaporation section at the bottom / side of the pile foundation and a condensation section at the top. The evaporation section exchanges heat with the soil, the condensation section is connected to the heat exchanger, and the heat pump ground source side is connected to the heat exchanger. The capillary wick drives the working fluid to flow back autonomously, realizing heat transfer or release. This application has the following effects: it resolves the contradiction between low energy consumption and year-round energy supply in existing technologies, achieves efficient bidirectional energy supply in winter and summer without additional power, and significantly reduces the energy consumption of building cold and heat source systems.

The utility model discloses a French universal joint, which belongs to the technical field of universal joints, and comprises a front insertion connecting pipe, and a side extension outer sleeve is arranged on the outer wall of the front insertion connecting pipe in an extending manner; the connector assembly comprises a front extending outer closed pipe, two front connector parts and a rear connector part, the front extending outer closed pipe is arranged on the outer wall of one side of the side extending outer sleeve in an extending mode, and two penetrating grooves are formed in the outer wall of the front extending outer closed pipe. According to the French universal joint, an upper matching block is driven by a side fixing rod to move, a V-shaped extension plate is used for clamping and fixing a front pipeline, a middle adjusting cam is matched with a rear insertion matching pipe, a rear pipeline is clamped and fixed, the fixing effect between the pipeline and the joint is better, meanwhile, the French universal joint can also be matched with more types of pipelines, and the practicability is high. The pipeline fixing device is convenient to mount and dismount, does not damage the pipeline, and is beneficial to long-term use.

The utility model discloses efficient stirring and cleaning equipment of a cement paste stirrer, which relates to the technical field of stirring equipment and comprises an assembly box, a feed hopper, a discharge port, an outer pipe and the like. The outer pipe is rotationally connected with the assembly box, the stirring plate is arranged on the outer side face of the outer pipe and inclines downwards, cement can circulate at the bottom and the middle of the container, retention is prevented, and the side scraping plate and the bottom scraping plate are attached to the inner wall and the bottom of the assembly box respectively. A servo motor on the top of the assembly box drives the outer pipe to rotate through an output shaft, an output straight gear and an action straight gear of the outer pipe. During stirring, a closed pipe is inserted into the outer pipe to block the water spraying holes, and the pipe insertion part is used for placing the closed pipe; during cleaning, the closed pipe is taken out, the top of the outer pipe is connected with a pipe joint which is connected with a water pipe, and the pipe joint enables the outer pipe to rotate to spray water for cleaning and can be placed on a pipe inserting part. The equipment can realize efficient stirring, ensures the uniformity of cement paste, is convenient to clean, is prolonged in service life, is convenient to operate, and improves the production quality and efficiency of the cement paste.

The invention discloses an adsorption device and a workpiece adsorption method, and relates to the technical field of workpiece adsorption. The adsorption device comprises: an adsorption member; a plurality of gas path channels; m negative pressure generating units; the air path switching module can be used for selectively communicating any air path channel with the air suction port of the corresponding negative pressure generation unit or communicating with the atmosphere or communicating with the closed pipeline; the limit negative pressure absolute value of the Nth negative pressure generating unit is smaller than that of the (N + 1) th negative pressure generating unit; when the air suction port of the Pth negative pressure generation unit is communicated with the air channel, the air channel corresponding to the (P-1) th negative pressure generation unit is communicated with the closed pipeline; and when the air channel corresponding to the (P-1) th negative pressure generation unit is communicated with the closed pipeline, the (P-1) th negative pressure generation unit stops working. The adsorption device is used for avoiding the heat accumulation phenomenon of the negative pressure generation unit on the premise that the adsorption pressure is guaranteed, the service life of the negative pressure generation unit is prolonged, and meanwhile the applicability of the adsorption device is improved.

The invention relates to a composite material pipe fitting pultrusion device based on a self-limiting magnetic suspension core mold. The composite material pipe fitting pultrusion device comprises a base, a raw material disc, a magnetic unit, a limiting unit, a forming unit and a traction unit, the core mold penetrates through the magnetic unit, the limiting unit and the forming unit; the raw material disc is of a rolling shaft structure used for winding a to-be-formed material. The magnetic unit is used for carrying out non-contact limiting on the core mold and applying backward force to the core mold to prevent the core mold from slipping off; the limiting unit is used for preventing the core mold from being separated due to stress; the forming unit is used for heating a to-be-formed material and processing the to-be-formed material into a pipe fitting; and the traction unit is used for clamping the pipe fitting and continuously and forwards pulling the pipe fitting to finally obtain a finished pipe fitting product. The device disclosed by the invention realizes continuous pultrusion of a closed pipe sleeve structure, is suitable for a hollow pipe type structure needing to be heated and cured, and provides a new process method for continuous molding of the hollow pipe type structure.

A corrugated beam guardrail stand column for controlling the embedding depth comprises a stand column body. The main body structure of the stand column is hollow column-shaped; a metal sealing pipe is fixedly arranged on the inner wall of the stand column body. A transparent tube is fixedly arranged between the metal closed tube and the upright post main body; a display window is arranged in the middle of the metal closed tube opposite to the transparent tube; the transparent tube is filled with colored liquid; and the metal closed tube is vertically provided with a graduated scale on one side of the transparent tube. The metal closed pipe is arranged in the stand column body, the graduated scale is arranged on the metal closed pipe, the embedding depth is calculated by comparing the graduated scale during construction and installation, the embedding depth of the stand column body can be conveniently controlled and checked, and constructors can rapidly and visually judge whether the stand column body is inserted in place or not. The length of the stand column body is prevented from being mistakenly used.

The utility model belongs to a separation device, and particularly relates to an oxygen filling gas-liquid separation device for an in-situ leaching uranium mining mine. The oxygen filling gas-liquid separation device for the in-situ leaching uranium mining mine comprises a liquid storage tank, a gas inlet pipe is arranged at the top end of the liquid storage tank, a pressure-bearing drain valve is arranged at the bottom of the liquid storage tank, and a gas outlet pipe is further arranged at the top end of the liquid storage tank. The device has the remarkable effects that after the device is put into use, the problems that liquid in a closed pipeline is difficult to discharge, and the pipeline is blocked due to residual liquid in the pipeline are effectively solved.

The invention provides a manufacturing method of a crimping type high-power high-voltage diode chip, and relates to the technical field of power semiconductor device manufacturing, and the method comprises the steps: forming an annular groove in the surface of a semiconductor wafer through laser grooving, and forming a circular PN junction isolation wall of a single chip in the groove in combination with a closed tube gallium-aluminum diffusion technology; carrying out boron-phosphorus double-substance diffusion in a unit cell region enclosed by the isolation wall to form a PN junction doping structure; a photoetching mask is adopted to limit an area, and a double-angle mesa structure is formed through chemical corrosion of an HF / HNO3 mixed solution; sequentially depositing a semi-insulating polycrystalline silicon layer and a double-layer glass passivation layer; performing laser cutting along the separating wall to separate the single chip; and sintering an anode molybdenum sheet on the anode surface of the chip, performing vacuum evaporation on a cathode aluminum film on the cathode surface of the chip, and alloying to form an electrode. According to the invention, the consistency and stability of chip manufacturing can be improved through the wafer-level mesa modeling and the inorganic passivation process.

To present effective configurations of a curved motion actuator using Warsaw-type artificial muscle and to embody various holding devices provided with the actuator.SOLUTION: An actuator 10 comprises: a multi-layered fiber reinforced tube 11 composed of two layers of a rubber base material layer and a fiber contained layer; cover members 12A, 12B attached to opposite ends of the tube 11, respectively; a binding member 20 in contact with a part of a lateral surface of the tube 11 and provided along an axial direction of the tube 11; an adhesive layer 31 connecting the tube 11 and the member; and fastening bands 13A, 13B. The cover members 12A, 12B close openings at the opposite ends of the tube 11, and maintains the inside thereof in a closed state. The fastening bands 13A, 13B are fastened to an outer peripheral surfaces at the opposite ends of the tube 11 and fastens the tube 11 with the binding member 20 such that no gap is present between the cover members 12A, 12B and the tube 11.SELECTED DRAWING: Figure 4

The utility model discloses a light fireproof plugging plate structure for sealing a tube well floor hole constructed from the lower part, which comprises an upper-layer edge keel, a lower-layer edge keel, an upper-layer horizontal keel, a lower-layer horizontal keel, an upper-layer fire-resistant paper surface gypsum board, a lower-layer fire-resistant paper surface gypsum board, rock wool and sealant, a plurality of upper-layer edge keels and a plurality of lower-layer edge keels are fixed to the upper portions and the lower portions of the opposite surfaces of a left beam and a right beam which are parallel to each other at the indoor top in the extending direction of the beams at intervals, upper-layer horizontal keels are fixed to the positions between the left upper-layer edge keels and the right upper-layer edge keels which correspond to each other, and upper-layer fire-resistant paper face gypsum boards are fixed to the lower surfaces of the upper-layer horizontal keels. Lower-layer horizontal keels are fixed between the left and right corresponding lower-layer edge keels, are positioned at the bottom end of the upper-layer fire-resistant paper surface gypsum board, are filled with rock wool, and are fixed on the lower surfaces of the lower-layer horizontal keels; the left end and the right end of the lower fire-resistant paper surface gypsum board are fixed to the bottoms of the left beam and the right beam respectively.

The application discloses an automatic conveying device, relates to the material conveying technical field, and improves a series of requirements and problems such as long distance, large conveying capacity and high efficiency, maximally reduces labor and material waste, and improves production efficiency, and comprises a hopper, a plurality of standard spiral conveying pipes, a plurality of series joints and a discharge port. The conveying device is assembled by a plurality of standard units, so that the conveying equipment is more miniaturized and simplified, equipment installation, dismounting and transportation are facilitated, different working environments and conditions can be adapted, power output of the conveying device is more stable and efficient by adopting a decentralized arrangement form, the conveying device can realize longer distance transportation, meanwhile, the conveyed materials are transported through a closed pipeline, so that the materials can be prevented from being accidentally spilled, personnel casualty and property loss are avoided, and the conveying device has higher safety. In addition, sealed transportation can effectively control dust pollution, irritating smell and the like, and has higher environmental protection.

The utility model discloses a feeding device convenient to installation, including main casing, lid and base, be equipped with hopper in main casing, be equipped with feeding upper casing and feeding lower casing on the base, and feeding upper casing, feeding lower casing rear end is connected with the mount seat upper casing and mount seat lower casing respectively, and feeding upper casing and feeding lower casing constitute the feeding closed pipe, and form has the feeding channel, and mount seat upper casing and mount seat lower casing constitute motor mount seat, and form the accommodation cavity, and be equipped with the pusher of driving feed movement to the pusher in feeding channel, and be equipped with the pusher motor drive assembly of transmission connection with the one end of pusher in the accommodation cavity of motor mount seat, be equipped with the pusher motor of fixed in pusher motor drive assembly and transmission connection with pusher motor drive assembly on pusher motor drive assembly, and pusher is installed to the feeding channel of feeding closed pipe conveniently, and pusher motor drive assembly is installed to the accommodation cavity in motor mount seat conveniently and is positioned fast.

In the present invention, a plurality of holes (61-68) are provided in a pipe (50) disposed in a chamber communicating with an engine (10), and openings (51, 52) at the ends of the pipe (50) are closed to form a space (A4) communicating with the chamber via the plurality of holes (61-68).

The application discloses a device for building settlement detection and a detection method thereof, and relates to the technical field of building settlement detection.The device comprises a plurality of single-point detection mechanisms, first connecting pipes are arranged between two adjacent single-point detection mechanisms, and a comprehensive detection mechanism is further arranged.The second connecting pipe is arranged between the comprehensive detection mechanism and the outermost single-point detection mechanism.The mounting frames are arranged on the outer surfaces of the single-point detection mechanisms and the comprehensive detection mechanism.The concrete bases are arranged at the lower ends of the mounting frames and are embedded in the ground.The closed pipeline is formed among the single-point detection mechanisms, the first connecting pipes, the second connecting pipe and the comprehensive detection mechanism, and the closed pipeline is filled with water.The single-point detection mechanisms are arranged to detect the settlement of a certain point of the building, and the comprehensive detection mechanism is arranged to average the detection results of the single-point detection mechanisms to obtain the overall settlement of the building, so that the efficiency is high.

The utility model belongs to the technical field of ammonia gas recovery, and particularly relates to an ammonia gas recovery device which comprises recovery equipment, the bottom of the recovery equipment is fixedly connected with a fixed base; the side wall of one side of the recovery equipment is communicated with a gas collecting pipe; an exhaust pipe is communicated with the side wall of one side, far away from the gas collecting pipe, of the recovery equipment; a closed pipe is arranged on the side wall of one side of the bottom of the recovery equipment; the top of the recovery equipment is fixedly connected with an output motor; during working, the rotating connecting disc can drive the multiple sets of side wall cleaning rods to clean reactants attached to the inner side wall of the recovery equipment, and a worker can take out the reactants in the recovery equipment through the sealing pipe; the whole device improves the cleanliness of the interior of the recovery equipment, and the situation that reactants are attached to the inner side wall of the recovery equipment is reduced; and the whole device stirs and mixes the gas to be treated, so that the situation that reactants are oxidized is reduced, and the recovery efficiency of nitrogen is improved by the whole device.

The present invention includes: a nozzle main body (1), which includes a tubular body (8) and a closing flat plate (9) that closes one tube end (8A) of the tubular body (8), and in which an inflow space (δ) into which a liquid flows is formed in the tubular body (8); a liquid jetting hole (2) penetrating through the closing flat plate (9) and communicating to the inflow space (δ); and a liquid guide (23) arranged in the liquid jetting hole (2) from the inflow space (δ). The liquid guide (23) is mounted in the liquid jetting hole (2) from a conical upper surface (23A) so as to form a liquid flow path (ε) between the uneven surface of the conical side surface (23C) and a conical inner peripheral surface (2a) of the liquid jetting hole (2).

The utility model discloses a tunnel temporary management and control warning device which comprises a winch, a manual control switch and a remote control switch, wherein the working end of the winch is provided with a winding and unwinding drum, and the manual control switch and the remote control switch control the winch to work. The winding and unwinding drum is suspended in the center of the top of the tunnel portal, and a fireproof cloth curtain with a warning sign is arranged on the winding and unwinding drum; the manual control switch is arranged on one side of the tunnel portal, and the control output end of the manual control switch is electrically connected with the control input end of the winch; a remote control unit is arranged on the winch, the signal output end of the remote control switch is in communication connection with the signal input end of the remote control unit, and the control output end of the remote control unit is electrically connected with the control input end of the winch. The tunnel temporary closed control system has the advantages that timely response can be achieved, the winch can be remotely controlled to put down the fireproof cloth curtain with the warning mark, then temporary closed control over a tunnel is rapidly achieved, and the response speed, safety, visibility and stability of tunnel temporary closed control are remarkably improved.

The utility model relates to the field of new material processing. The rotary vibration screen with the dustproof function comprises a base and a plurality of layers of screen drums installed above the base through elastic columns. An inverted-cone-shaped barrel cover is arranged at the top of the screen barrel located on the uppermost layer, a feeding port is formed in the center of the barrel cover and extends downwards to form a feeding barrel, the lower end of the feeding barrel is closed, two discharging pipes which incline outwards and downwards and are communicated with the feeding barrel are arranged on the left side and the right side of the lower end of the feeding barrel, and pipe sealing plates are arranged at pipe openings in the lower ends of the discharging pipes. A hinge seat is arranged on the outer surface of the upper side of the discharging pipe, and the upper end of the pipe sealing plate and the hinge seat form hinge joint which can abut against and seal a pipe opening under the action of gravity. According to the utility model, materials on the screen drum on the uppermost layer can be prevented from raising to generate dust under the action of excitation, so that the clean production environment of a workshop is ensured, and the harm to workers is reduced.

To provide a fountain pen capable of suppressing ink from being pushed out to the pen tip even when air in an ink storage section expands. [Solution] The fountain pen (100) of the present invention comprises a neck (2) into which a pen core (23) having an ink flow passage (231) is inserted, and a barrel (3) having an ink reservoir (35) therein and to which the neck (2) is attached, with a core member (5) having a groove (51) formed inside the ink reservoir (35) that communicates with the ink flow passage (231) of the pen core (23). The fountain pen (100) also comprises a tubular member (6) that is arranged on the outside of the core member (5) so as to cover the core member (5) from its middle to its rear end, a first closing member (7) that is movable axially within the ink reservoir (35) and closes an opening (61) on the rear end side of the tubular member (6), and a second closing member (8) that is movable axially within the ink reservoir (35) and closes a gap between the outer peripheral surface of the front end of the tubular member (6) and the inner peripheral surface of the ink reservoir (35).

The application discloses a coal mine underground gas treatment detection device, and relates to the technical field of detection equipment, which comprises a main body box, an air duct assembly, a pipe body storage channel, a rotating displacement body and a pushing assembly. A pump air assembly is fixed on the main body box, a top opening is arranged at the top of the main body box, a bearing plate is further fixed on the inner wall of the main body box, and a probe is arranged on the bearing plate. A transverse partition plate is arranged in the main body box, and a positioning groove is arranged on the partition plate. A closed pipe is fixed on the top opening. The air duct assembly is used for extracting gas at different heights in a coal mine shaft and conveying the gas into the main body box, and the bottom of the air duct assembly is communicated with the main body box. The pipe body storage channel is fixed in the main body box and is an S-shaped channel, and an opening is arranged at the bottom of the pipe body storage channel. The rotating displacement body is plate-shaped, and the rotating displacement body is used for assisting the splicing of the air duct assembly by rotating. The coal mine underground gas treatment detection device has the technical effects that the volume of the coal mine underground gas treatment detection device is relatively small, the moving flexibility is high, the gas concentration at a relatively high position can be conveniently detected, and the degree of automation is relatively high.

The utility model discloses an isolation type rapid heat exchange device which comprises a heat exchange pipeline used for circulation of heat absorption working media, a plurality of slender heat conduction pipes are evenly arranged in the axial direction of the heat exchange pipeline at intervals, the heat conduction pipes are closed pipes with inner cavities, heat conduction media are arranged in the inner cavities of the heat conduction pipes, and the heat conduction media are communicated with the heat exchange pipeline. And one end of the heat conduction pipe extends into the heat exchange pipeline to be in contact with the heat absorption working medium flowing through the heat exchange pipeline, and the other end of the heat conduction pipe is inserted into a heat source. According to the isolation type rapid heat exchange device, heat conduction is conducted through the heat conduction pipes, heat is transferred from a heat source to the heat absorption working medium in the heat exchange pipeline, and therefore rapid heat exchange is achieved, physical isolation between the heat exchange pipeline and the heat source is achieved, direct contact between the heat source and the heat absorption working medium is avoided, and heat exchange efficiency is improved. Therefore, the problem of corrosion of a corrosive heat source to heat exchange equipment is effectively solved.

The invention relates to a stranded copper conductor on-line annealing system and method. The system sequentially comprises a pay-off device, a wire storage device, a traction device, a catenary closed pipeline and a take-up device in the advancing direction of a conductor. A sealing function module, a nitrogen recovery function module, a high-frequency induction annealing function module, a multi-section gas heat preservation / cooling function module and a water cooling function module are integrated in the catenary closed pipeline, and an inert gas protection environment is formed. The method is realized based on secondary development of an existing production line. According to the invention, non-stop continuous production is realized through cooperation of double discs and wire storage; a high-frequency induction heating and multi-section controllable cooling process is adopted, so that uniform heating and smooth cooling of the conductor are ensured; the sealing structure is reliable, and nitrogen can be recycled. The system can stably produce the copper conductor with the conductivity greater than or equal to 100% and consistent structural performance, and has the advantages of high efficiency, excellent quality, low cost, good environmental protection property and the like.

A single-sided flexible bending and fitting Mongolian yurt felt blanket, comprising a barrier air cushion, the barrier air cushion comprising a lower row pipe pad (10), an upper row pipe pad (20) and a close-keeping (30, 40), a lower flexible hinge (12) is connected between two adjacent lower closed pipe bodies (11) in a flexible plate shape by being interlaced and woven up and down; the upper closed pipe body (21) is stacked above the space between two adjacent lower closed pipe bodies (11) to seal the space; the close-keeping (30, 40) can make the close-keeping (30) only apply force to the upper closed pipe body (21) in the thickness direction or can reduce the bending stress of the upper closed pipe body 21 when the lower row pipe pad (10) is flexibly and outwardly bent, so that it can be closely kept above two adjacent lower closed pipe bodies (11) to seal the space. It can be flexibly bent to have good fitting, and has excellent heat preservation performance which is obviously better than that of 5-layer wool felt.

The utility model relates to the technical field of high-voltage cable joints, and discloses an intermediate joint of a high-voltage cable, which comprises a lower shell, an upper shell used for protection is arranged at the top of the lower shell, a limiting tube used for fixing is arranged in the lower shell, two ends of the limiting tube are respectively provided with a closed tube, and a cable is arranged on the inner wall of the limiting tube. According to the intermediate joint of the high-voltage cable, through cooperative arrangement of the limiting pipe, the sealing pipe and the cable, the device can fix and seal a connecting part during use, and external moisture, moisture, dust and other impurities are prevented from entering the device, so that the insulating property of the device is improved, and the situations of electric leakage and short circuit are reduced; the limiting pipe can fix a cable connecting part and prevent the connecting part from falling off due to stress, the sealing pipe can block moisture and dust, so that the influence of the external environment on the connecting part is reduced, and the cable can transmit electric power.

Provided is a muffler (30) for an engine, the muffler (30) comprising: a first chamber (31); and a closed tube (50) that communicates with the first chamber (31) via the open end (51) and communicates with the second chamber (60) via the first opening (Z1) in the side surface (53). Furthermore, provided is an exhaust pipe (20) for an engine, the exhaust pipe (20) comprising: a main pipe; and a closed tube (50) that communicates with the main tube via an open end (71) and communicates with the fourth chamber (81) via a third opening (Z3) in the side surface (73).

A refrigeration apparatus and a method for bleeding thereof are provided. The refrigeration apparatus comprises a compressor comprising a compressor inlet and a compressor outlet; a condenser downstream of the compressor outlet; a first valve downstream of the condenser; and at least one flow path downstream of the first valve, each of the at least one flow path comprising a flow regulating valve to control the flow of refrigerant into the at least one flow path; wherein the first valve and the flow regulating valve are normally closed valves, and wherein the refrigeration system further comprises a bleed flow path connected between the first valve and the flow regulating valve, thereby allowing fluid to escape between the first valve and the flow regulating valve when the first valve and the flow regulating valve are closed. Embodiments according to the present invention effectively bleed fluid in a closed circuit, preventing the creation of high pressure.

To provide a muffler capable of simplifying assembling work.SOLUTION: The silencing device 20 of the present disclosure includes the outer shell member 31 in which the silencing space SP is formed, and the internal pipe 51 disposed in the silencing space SP. An outer shell opening 60 is formed in the peripheral wall of the outer shell member 31, and a pipe opening 68 is formed in the peripheral wall of the internal pipe 51. The internal pipe 51 has a cylindrical protruding portion 69 protruding radially outward from the peripheral wall. The protruding portion 69 is provided around the axis of the pipe opening 68. The oxygen sensor 64 is disposed so as to close the pipe opening 68. The muffling device 20 further includes a cap 72 that covers the shell opening 66. The cap 72 is joined to a peripheral portion of the outer shell opening 66 in the outer shell member 31 and the protrusion 69 of the internal pipe 51. The outside diameter d1 of the projection 69 is set to be smaller than the inside diameter d2 of the outer shell member 31.SELECTED DRAWING: Figure 4

This invention relates to a method, system, storage medium, and equipment for monitoring soil pressure on closed-end pipe piles based on fiber optic grating (Fiber Bragg grating) sensing technology, belonging to the field of geotechnical engineering monitoring technology. This invention, for the first time, combines the theory of thick-walled cylinders based on elastoplastic mechanics with distributed fiber optic grating sensing technology to construct a precise analytical model relating the axial strain, circumferential strain, and soil pressure on the pile body of the closed-end pipe pile, achieving a technological leap from "point measurement" to "distributed sensing." Compared to traditional point-based soil pressure cell monitoring methods, this invention enables high-precision, quasi-distributed, and long-term stable monitoring along the entire length of the pile. Simultaneously, the fiber optic grating possesses unique advantages such as small size, resistance to electromagnetic interference, corrosion resistance, and wear resistance, causing no damage to the pile itself and being easy to operate. This significantly improves the continuity and reliability of soil pressure measurement, effectively overcoming the technical shortcomings of traditional sensors, such as susceptibility to damage during pile driving and the inability to monitor in real time.