58 results about "Beam tube" patented technology

The steering axle frame of the low-speed unmanned logistics vehicle comprises a front beam pipe, a steering frame, a connecting sleeve and the like, the connecting pipe is provided with a connecting section and a limiting section, the connecting section is inserted into the front beam pipe, and the limiting section abuts against the end of the front beam pipe; one end of the connecting joint is arranged on the connecting sleeve, and the other end is movably inserted into a steering groove of the bogie; the connecting rotating shaft is arranged on the connecting joint and is rotationally connected with the bogie; the positioning lock pin is arranged on the connecting joint and is inserted into the locking groove of the connecting rotating shaft so as to lock the connecting rotating shaft and the connecting joint; and the gasket is arranged between the connecting joint and the bogie so as to lock the axial position of the connecting joint. According to the steering axle frame, the connecting strength between the connecting joint and the front beam pipe is improved by additionally arranging the connecting sleeve, so that the connecting joint and the front beam pipe are not prone to breakage; axial positioning of the connecting rotating shaft is achieved through the positioning lock pin and the gasket, axial movement is avoided, and noise generated by axial movement is eliminated.

The utility model relates to an indoor composite optical cable based on a micro-beam tube structure, which comprises an outer sheath, an inner sheath, a central reinforcing member, a plurality of micro-beam tube units distributed along the circumferential direction, a waterproof layer and a filling structure, the outer sheath wraps the outermost layer of the optical cable, and the inner side of the outer sheath is provided with a spirally wound nonmetal tensile belt. The inner sheath is coaxially nested in the outer sheath, an annular gap is formed between the inner sheath and the outer sheath, two non-metal reinforcing members are symmetrically embedded in the annular gap and are located at the axis position of the optical cable, and the micro beam tube unit comprises a plurality of optical fibers and a microporous polyester belt wrapping the optical fibers. The micro beam tube units are spirally twisted and arranged by taking the central reinforcing piece as a circle center, the central reinforcing piece is located at the axis position of the optical cable and provides stable support for the whole optical cable, and the micro beam tube units are spirally twisted and arranged by taking the central reinforcing piece as the circle center, so that the optical cable is endowed with good flexibility and bending resistance.

The application discloses a kind of based on heat trigger solid-liquid reaction's goaf spontaneous combustion initiative inerting device and method, belong to coal mine fire prevention technical field, first based on experimental data, goaf beam tube monitoring and numerical simulation determine goaf high temperature prevention area, under the influence of setting safety margin and considering the maximum thickness of residual coal determine the starting temperature of adaptive inerting device, then according to goaf residual coal thickness, porosity, oxygen concentration field and high temperature prevention area area calculate out initiative inerting device size and reagent filling amount, finally combine the effective coverage area of single device and honeycomb grid generation algorithm, design initiative inerting device dynamic pre-buried point, and pre-bury initiative inerting device in coal mining face, when device reaches the high temperature protection area of goaf deep, temperature sensing guide column paraffin melt, aluminum sulfate solution in liquid reagent storage tank flows into solid reaction bin and sodium bicarbonate reaction along guide column, generate a large amount of CO2 from exhaust port, rapidly reduce local oxygen concentration, eliminate goaf spontaneous combustion hazard.The core innovation of the application is to abandon the traditional passive prevention mode relying on gas diffusion, and instead adopt the initiative control mechanism of "temperature sensing trigger-in-situ reaction-directional release", so that CO2 directly acts on the high temperature area through the directional exhaust port, rapidly reduces the local oxygen concentration, cuts off the necessary condition of coal spontaneous combustion from the source, realizes the initiative identification and accurate inerting of goaf high temperature area, and ensures the safety production of coal mining face.

The utility model discloses a cutting head closed light path telescopic air pressure balancing device which comprises an upper light beam barrel, a bidirectional vacuum filter is installed on the outer side of the upper light beam barrel, an upper protective mirror is installed on the top of the upper light beam barrel, a collimating mirror is arranged at the bottom of the upper protective mirror, and a middle light beam barrel is fixedly arranged at the bottom of the upper light beam barrel. A lower light beam barrel is fixedly installed at the end of the middle light beam barrel, a lead screw integrated motor is arranged on the outer side of the lower light beam barrel, a protection lens base is arranged on one side of the lead screw integrated motor, and a focus lens and a lower protection lens are installed in the protection lens base. According to the cutting head closed light path telescopic air pressure balancing device, the protective lens base is made to move up and down through the lead screw integrated motor, a sealing ring is installed on a focusing lens barrel on the upper portion of the protective lens base, and the light path sealing performance is guaranteed; the up-and-down moving resistance of the front end is reduced through the bidirectional vacuum filter, and the responsivity of the follow-up shaft is improved; and the cutting nozzle is prevented from colliding with the plate.

The utility model provides a production cutting device for a central beam tube type OPGW optical cable, and belongs to the technical field of optical cable processing. Comprising a bottom plate, a discharging opening formed in the side wall of the bottom plate, a material guiding plate fixedly installed on the inner wall of the discharging opening, a vertical plate fixedly connected to the side wall of the bottom plate, a limiting hole formed in the surface of the bottom plate, a motor frame fixedly installed on the side wall of the vertical plate and a material receiving assembly arranged at the bottom of the bottom plate. Through cooperative use of the driving assembly and the auxiliary assembly, the optical cable cutting and stripping integrated operation is realized, the processing efficiency is greatly improved, the driving assembly adopts a high-precision servo motor to be matched with a rotating disc, the rotating speed of a cutting head can be accurately controlled according to actual processing requirements, the accuracy of the cutting length is ensured, and the production efficiency is improved. The auxiliary assembly can automatically adapt to optical cables with different diameters through spring buffering and arrangement of a movable wire seat, stable clamping force is provided in the cutting process, and the optical cables are prevented from slipping or deviating.

The invention discloses an indoor micro-beam tube type optical cable, which comprises a micro-beam tube, aramid yarn, a tearing rope and an outer sheath, and is characterized in that the outer sheath is arranged outside the micro-beam tube and the tearing rope, and the outer sheath is made of a low-smoke halogen-free material with an oxygen index greater than or equal to 40%; the micro beam tube comprises an optical fiber, a filling layer and an inner sheath, the inner sheath is arranged on the outer side of the optical fiber, and the filling layer is filled between the optical fiber and the inner sheath. The invention provides a dynamic adaptation strategy of a filling layer material and an inner layer sheath material, the provided indoor micro beam tube type optical cable can guarantee the structural integrity of the sheath, gives consideration to protection performance and construction operability, solves the contradiction that the inner layer sheath of a traditional optical cable is insufficient in protection or too hard to operate, can block moisture intrusion in a humid environment, and also can prevent the inner layer sheath from being damaged. And external force impact can be buffered through the filling layer, so that stable operation of the optical cable under extreme weather conditions such as high temperature and cold and complex scenes such as industrial oil contamination and high humidity can be ensured.

The invention provides a clinical anesthesia support structure convenient to operate, and relates to the technical field of medical instruments. The adjusting part is arranged below the beam tube part; the supporting part is arranged below the adjusting part; the blocking part is arranged above the supporting part; a cylindrical groove is formed in the top of an adjusting plate, connection of a connecting block is facilitated, then stability of a matched restraining block is kept conveniently, a fixing frame is fixed to the adjusting plate, a telescopic frame and an outer clamping frame are fixed conveniently, the telescopic frame and the outer clamping frame stretch out and draw back and turn over while stability is kept, and then the supporting range of the telescopic frame and the outer clamping frame is increased; according to the anesthesia support structure, a plurality of supporting devices are arranged, so that supporting treatment can be conveniently carried out in multiple directions in the operation process, and the problems that for an existing traditional anesthesia support structure, supporting treatment is generally achieved through stretching and retracting of a tubular structure, but due to the fact that the number of tools needed to be laid in the clinical operation process is large, supporting in different directions is inconvenient to carry out are solved.

The invention discloses a method and a system for measuring the diffusion radius of nitrogen injected in a goaf, and belongs to the technical field of safe mining of coal mines. Comprising the steps that beam tube monitoring points are arranged on the air inlet side and the air return side of a goaf, the oxygen concentration of each monitoring point is monitored in real time, and the advancing distance and nitrogen injection process parameters of a working face are synchronously recorded; the nitrogen injection process parameters comprise the nitrogen injection flow and the embedding position of a nitrogen injection port; extracting oxygen concentration data under a non-nitrogen injection condition, establishing a function relationship of the oxygen concentration along with the change of the advancing distance of the working face through linear fitting, and calculating a corresponding heat dissipation band termination position when the oxygen concentration is reduced to a first preset threshold value based on the function relationship; acquiring oxygen concentration data of the goaf under the specific nitrogen injection flow, and determining a corresponding post-nitrogen-injection heat dissipation zone termination position and a corresponding post-nitrogen-injection oxidation zone termination position when the oxygen concentration is reduced to a first preset threshold value; and calculating the difference value between the termination position of the heat dissipation belt and the termination position of the heat dissipation belt after nitrogen injection to obtain the nitrogen diffusion radius under the nitrogen injection flow.

The application provides a kind of laser pumped cesium atomic beam clock parameter adaptive setting device and method, relating to atomic clock technical field, including cesium beam tube unit;Cesium beam tube drive unit;Frequency stabilization laser light source unit;Acoustooptic frequency shift unit;Crystal oscillator lock frequency unit;Temperature acquisition and control unit;Wherein, main control unit is connected each controlled module by communication interface, and in-machine computer runs host computer software: calculate relative frequency deviation and allan variance, obtain frequency deviation sequence and allan variance data set;Determine the optimal working parameter combination corresponding to peak value;Linkage executes primary temperature control, secondary temperature control and tertiary temperature control, realizes temperature gradient compression and wavelength stability control;Compare real-time monitoring parameters with preset threshold, determine alarm level, thereby trigger system response instruction.The beneficial effects of the application are to reduce labor cost, improve temperature adaptability and improve long-term stability index.

The invention provides a vacuum type large-panel semiconductor detector, and relates to the field of semiconductor detectors. The detector comprises a detector cavity, a front end plate and a rear end plate which are detachably connected with the detector cavity are arranged at the two ends of the detector cavity respectively, a vacuum adapter plate is arranged on the end face, facing the exterior of the detector cavity, of the front end plate, and the vacuum adapter plate is used for being connected with an external sample cavity body; the vacuum adapter plate is provided with a front panel, the front panel is provided with a beam through hole and a plurality of front-end modules, and the beam through hole is located between two adjacent front-end modules; the vacuum type large-panel semiconductor detector further comprises a beam tube, one end of the beam tube is arranged in the vacuum adapter plate and communicated with the beam through hole, and the other end of the beam tube penetrates out of the rear end plate. And a rear-end electronic component is also arranged in the inner cavity of the detector cavity. According to the invention, a signal with a higher scattering angle can be collected, so that the ultimate resolution of structural analysis of a coherent diffraction experiment is improved.

The utility model discloses peeling equipment for an aluminum profile casting rod, and belongs to the field of aluminum profile processing. According to the technical scheme, the peeling equipment for the aluminum profile casting rod is divided into a peeling machine body and a grinding pipe body, and the grinding pipe body is arranged at the output end of the peeling machine body in a matched mode; according to the aluminum profile peeling device, an aluminum profile peeling structure is optimized, a beam tube clamping groove and a position correction part are arranged at the front end, the overall limiting precision and the fixing capacity in the aluminum profile machining process are achieved, and therefore the comprehensive quality in the aluminum profile peeling process is further improved; and meanwhile, the structure of the peeling part is optimized, the surface of the aluminum profile is subjected to peeling treatment in a transverse tooth grinding mode, the error-tolerant rate in the surface treatment process of the aluminum profile is increased, and the actual production loss is further reduced.

This invention relates to a telescopic folding bicycle, comprising: a frame including a main beam tube, a front fork, and a rear fork; the main beam tube includes a first portion and a second portion that are nested together; the front fork is connected to the first portion; the rear fork is connected to the second portion; the front fork is used to mount the front wheel; and the rear fork is used to mount the rear wheel. The first portion can switch between a forward-extended first position and a rearward-retracted second position relative to the second portion, thereby allowing the telescopic folding bicycle to switch between an unfolded state and a folded state. Since the main beam tube includes the nested first and second portions, when folding the telescopic folding bicycle, simply switching the first portion from the first position to the second position relative to the second portion is sufficient. When the first portion is in the second position relative to the first portion, the size of the main beam tube is smaller, thus making the overall size of the telescopic folding bicycle smaller.

The utility model relates to the technical field of optical cables, and discloses a micro-beam tube OPGW optical cable which comprises a leather hose, an elastic buffer layer is arranged on the inner side of the leather hose, a metal layer is fixedly installed on the inner layer of the elastic buffer layer, and an optical cable tube is arranged on the inner side of the metal layer. An annular layer is arranged on the inner wall of the metal layer; the moisture-proof part is arranged on the inner wall of the metal layer and on the outer side of the leather hose for moisture-proof treatment; the moisture-proof part comprises a floating ball piece and a plugging piece, the floating ball piece is arranged on the inner wall of the metal layer, and the floating ball piece is connected with the plugging piece. The V-shaped frame is extruded by the cotton ball, then the ventilation cylinder is moved to the concave position of the vertical piece through the matching effect of the V-shaped frame, the vertical piece and the extrusion spring, ventilation is formed at the moment, then through the matching effect of the ventilation cylinder, the ventilation pipe and the cotton ball, drying of the outside is accelerated, blowing is formed in the reverse direction, internal moisture is blown away, and therefore the automatic moisture-proof effect is achieved.

The present application relates to cat climbing frame technical field, concretely is a cat climbing frame for removing impurity hair, including climbing frame mechanism, trimming exhaust mechanism installed on climbing frame mechanism and straightening cap mechanism installed between trimming exhaust mechanism and climbing frame mechanism, when cat pet walks on the inside plate piece of beam plate, the main conductive sheet fixed on the inside plate piece can be pressed and adhered to the top of auxiliary conductive sheet, and the outer frame is fixedly installed on both sides of the outside of beam plate, with the descending of beam plate, the outer frame also pushes the inner cavity of climbing ladder bin towards two beam tube pads, at this time, the semicircular arc plate in the beam tube pad drives the multiple brush columns fixed on the inner wall to press and straighten the hair on the skin of cat pet, when cat pet passes through the semicircular arc plate, the hair to be dropped or broken on cat pet is cleaned to the inside of beam plate, finally, along with the directional blowing of turbine fan blade, the airflow in the inner cavity of climbing ladder bin can blow the dropped hair to the inner cavity of storage drawer.

The utility model discloses a carsickness ointment middle beam tube, and particularly relates to the technical field of carsickness ointment middle beam tubes, the carsickness ointment middle beam tube comprises a base, the top of the base is fixedly connected with an inner cylinder, the side face of the inner cylinder is provided with a limiting sliding groove, the middle of the inner cylinder is provided with a movable ointment seat, the top of the movable ointment seat is provided with a carsickness ointment column, and the carsickness ointment column is provided with a carsickness ointment. Limiting sliding blocks are fixedly connected to the two sides of the movable paste base. Firstly, the outer sleeve is rotated to control the movable ointment base to move up and down in the middle of the inner cylinder, one end of the carsickness ointment column is conveniently controlled to be pushed out for smearing, and through meshing of the first annular teeth and the second annular teeth, fixed force can be generated for the rotation angle of the outer sleeve after rotation, and the carsickness ointment column is convenient to use. The extension length of the carsickness ointment column is conveniently fixed, smearing and using are convenient, normal use of rotation driving is not affected, carsickness symptoms are relieved through smearing of the carsickness ointment column at any time, and the comfort degree of people going out is improved.

The invention discloses a corrugated pipe and a synchrotron radiation accelerator with the corrugated pipe, and the corrugated pipe comprises a corrugated outer pipe which extends along a first direction; the shielding pipe is arranged on the radial inner side of the corrugated outer pipe and comprises two beam current pipelines, the two beam current pipelines extend in the first direction and are arranged at intervals in the first direction, and the opposite ends of the two beam current pipelines are fixed to the corrugated outer pipe; the sliding unit comprises a sliding part extending in the first direction, the sliding part is a conductive part, and the two ends of the sliding part are configured to be attached to the beam pipelines on the same side in the first direction in a sliding mode all the time. According to the corrugated pipe, high-order mode leakage and electron beam instability can be effectively restrained, the heating phenomenon caused by too large resistance of the corrugated outer pipe wall is avoided, meanwhile, the corrugated pipe has a reliable deformation compensation function, and therefore the reliability and applicability of the corrugated pipe are remarkably improved.

The invention provides a high-voltage protection device for a particle accelerator, which is supported between a wire harness pipeline and an outer protection pipe of the particle accelerator and is used for connecting two adjacent wire harness pipelines in the axial direction, and the high-voltage protection device is symmetrically distributed relative to the splicing position of the two adjacent wire harness pipelines. Comprising at least two insulation sleeves, a first supporting ring and a second supporting ring which are coaxially distributed, the insulation sleeves are of a circular tube shape, the at least two insulation sleeves are arranged at intervals in the radial direction of the outer protection tube, and the insulation sleeve close to the outer protection tube is matched with the outer protection tube in an inserted mode so as to be connected with the two adjacent outer protection tubes in the axial direction; the first supporting rings are arranged between two adjacent insulating sleeves in a supporting manner; the second supporting ring is connected to the joint of every two adjacent wire harness pipelines in a sleeving mode, and the second supporting rings are arranged between the wire harness pipelines and the insulating sleeves close to the wire harness pipelines in a supporting mode. The symmetrical design of the high-voltage protection device can ensure the stability of a high-voltage electric field and improve the insulation protection effect.

The utility model discloses a baffle plate for a shell-and-tube heat exchanger, and relates to the field of single-bow type baffle plates, the baffle plate comprises a plurality of baffle plates which are vertically distributed in a staggered manner, an inclined surface is formed on the top end surface of each baffle plate, a plurality of beam tube holes are formed in each inclined surface, and a plurality of beam tube holes are formed in each beam tube hole. A guide structure is arranged at the position, located at the edge of the beam tube hole, of the top of the inclined face. The utility model discloses. The flow direction of fluid in a shell pass is changed for multiple times, so that the flow resistance is increased, the pressure drop is larger, larger pump power is needed to overcome the resistance, and the operation cost is increased.

The utility model discloses a kind of all-terrain vehicle beam pipes, relate to all-terrain vehicle beam technical field, including beam pipe body, several assembly parts are provided on the beam pipe body, the beam pipe body has gradually bending from two ends to middle and forms bending surface at the bottom of the beam pipe body, the beam pipe body is also provided with reinforcing member, by being provided with reinforcing member and bending surface, when the beam pipe body is used as bearing effect, compared with traditional radial beam pipe, the beam pipe body is not easy to be pressed and broken, the beam pipe body is also provided with reinforcing member, and the structural strength of the beam pipe body is improved by reinforcing member.

The utility model belongs to the technical field of optical cables, and discloses a central beam tube type high-temperature-resistant high-strength optical cable, which comprises an optical fiber, a compression-resistant elastic body is sleeved on the periphery of the optical fiber, the optical fiber is tightly wrapped by the compression-resistant elastic body, an inner protection layer is extruded outside the compression-resistant elastic body, a tensile unit is arranged outside the inner protection layer, and the tensile unit is connected with the optical fiber. An inner protection layer is extruded on the periphery of the tensile unit, an outer protection layer is extruded on the periphery of the tensile unit, the optical fibers comprise a plurality of colored optical fibers with different colors, the compression-resistant elastomer is a PBT loose tube, a space between the PBT loose tube and the optical fibers is filled with fiber paste, and the inner protection layer and the outer protection layer are fluoroplastic heat insulation protection layers. The periphery of the optical fiber is wrapped by the high-strength PBT loose tube, the tensile property and the compression resistance are good, the aramid fiber braid layer is arranged between the two fluoroplastic heat insulation protection layers, the tensile property and the bending resistance are improved, and in addition, the heat insulation effect of the two fluoroplastic heat insulation protection layers is better than that of the single fluoroplastic heat insulation protection layer.

The utility model discloses a cleaning device for oral cavity treatment, which comprises a storage box, a temperature sensor is arranged on the inner wall of the storage box, heating mechanisms are arranged on both sides of the inner wall of the storage box, both sides of the surface of the storage box are fixedly connected with two connecting blocks, and the surfaces of the connecting blocks are fixedly connected with beam tube mechanisms. The heating mechanism comprises heating nets arranged on the two sides of the inner wall of the storage box. According to the cleaning device for oral treatment, through the arrangement of the tube bundling mechanism, when the cleaning device is used, redundant pipelines are wound on tube bundling columns on the two sides of a storage box, then a power source is switched on, an electric push rod on the top is started, and the electric push rod drives a limiting plate at the tail end to limit the pipelines wound on the tube bundling columns; therefore, the effect of bundling redundant pipelines is achieved, the situation that the pipelines are scattered and interwoven at will, consequently, medical workers are stumbled by the pipelines in the operation process, the operation flexibility and smoothness are affected, and the treatment time is prolonged.

The application discloses a cavity processing method for RF superconducting accelerating cavity conduction cooling, and the steps of the method comprise the following steps: 1) depositing a niobium tri-tin film on the inner surface of a superconducting cavity, and vertically testing the obtained niobium tri-tin film cavity in liquid helium; 2) after cleaning and vacuumizing the niobium tri-tin film cavity, filling the inside with a protective gas; 3) performing sand blasting treatment on the outer surface of the superconducting cavity to facilitate copper powder deposition; 4) adopting a cold spraying process to coat copper on the outer surface of the superconducting cavity after sand blasting treatment, so as to form a cold sprayed copper layer; 5) performing mechanical polishing on the equatorial position of the superconducting cavity and the positions close to the ellipsoid part on both sides of the beam tube; 6) sleeving an oxygen-free copper hoop ring matched with the equatorial position of the superconducting cavity into the equator of the superconducting cavity, and fixing an oxygen-free copper hoop matched with the beam tube of the superconducting cavity on both beam tubes of the superconducting cavity; and 7) performing cold sprayed copper treatment on the oxygen-free copper hoop ring and the positions on both sides of the oxygen-free copper hoop of the superconducting cavity again, so as to form a secondary cold sprayed copper layer.

The lipstick structure comprises a middle beam tube, a first cavity is formed in the middle beam tube, a limiting plate is fixedly arranged on the inner wall of the first cavity, the first cavity is divided into an upper cavity and a lower cavity by the limiting plate, a limiting hole communicated with the upper cavity and the lower cavity is formed in the limiting plate, and the limiting hole is communicated with the upper cavity and the lower cavity. The bead part comprises a lifting lipstick tube, the lifting lipstick tube is arranged in the upper cavity, a spiral lifting rod is arranged at the lower end of the lifting lipstick tube, the spiral lifting rod extends into the lower cavity from the limiting hole, the spiral lifting rod is in up-down sliding fit in the limiting hole, and the knob bottom cover is arranged in the lower cavity. According to the lipstick structure, the mode that the middle beam tube, the limiting plate, the bead part and other components are ingeniously combined is adopted, so that the whole lipstick structure is more compact, space is saved, small and portable products can be manufactured easily, the convenience and reliability of lipstick use are improved, meanwhile, the assembling efficiency is high, and the cost is low. And the labor cost and the time cost in the production process are saved.

The utility model discloses a portable mining gas collecting device, which comprises a negative pressure sampler body, a gas inlet hose and a gas outlet hose, the negative pressure sampler body comprises a gas inlet hose and a gas outlet hose, and the gas inlet hose and the gas outlet hose are arranged side by side; the anti-falling pipe fitting is inserted into the inner side of the air inlet hose, and the other end of the anti-falling pipe fitting is connected with a beam pipe through a circular truncated cone with an enlarged outer diameter so as to prevent the beam pipe from falling off; according to the device, the beam tube and the sampling rubber balloon can be conveniently and rapidly installed through the anti-falling pipe fitting with the outer diameter of the pipe opening changing and the connecting hard pipe, the beam tube is not prone to falling off after being installed, the connecting firmness is good, and the device has the advantages of being simple in structure, low in manufacturing cost and convenient to carry.

The utility model discloses a folding bicycle frame with a full-triangle triangular pyramid structure, which comprises a left upper fork, a right upper fork, a left grabber, a right grabber, a middle tube, a left lower fork, a right lower fork, a five-way joint, a rear beam tube, a front beam tube and a folding box, the upper ends of the left upper fork and the right upper fork are connected with the middle tube, the lower ends of the left upper fork and the left lower fork are connected with the left grabber, and the lower ends of the right upper fork and the right lower fork are connected with the right grabber. The lower ends of the right upper fork and the right lower fork are connected with the right grabber, the left upper fork, the left lower fork, the left grabber and the middle pipe form a left rear tripod, and the right upper fork, the right lower fork, the right grabber and the middle pipe form a right rear tripod; reinforcing pipes are arranged at the ends, close to the folding box, of the bottom bracket and the rear beam pipe, and the reinforcing beam, the middle pipe and the rear beam pipe form a front tripod. The bicycle frame has the advantages that the strength is high, the stress of the bearing triangular area is uniform, the attractiveness is high, the bicycle frame forms a three-dimensional full-triangular pyramid stress load structure, and the bearing capacity of the bicycle frame is improved.

The present application relates to the field of reactor technology, and more particularly to a reactor, a top beam tube shielding body and an assembling method. In the top beam tube shielding body, a hoisting assembly is arranged on the top of a shielding main body, so that remote control hoisting and falling of the shielding body is more convenient. A plurality of support assemblies are arranged around the sidewall of the shielding main body and connected to the sidewall. The sidewall of the shielding main body is adapted to be embedded and connected to each support assembly under the action of gravity, so that the falling and centering of the shielding body are more stable and reliable. A shielding block is adapted to be embedded in the top sidewall of the shielding main body. The shielding block is used to drive the beam tube to be embedded in or removed from the cavity of the shielding main body, so that the beam tube can be accurately and efficiently closed in the cavity of the shielding main body, and the subsequent replacement and maintenance of the beam tube are more convenient. Therefore, the top beam tube shielding body, the assembling method and the reactor can have the functions of anti-seismic, high-precision positioning and disassembly and assembly without personnel intervention in a high radiation environment.

The utility model discloses a kind of salve tubes of improving rotary hand feeling, comprising: base;Spiral seat, it is positioned on base, wherein middle part is axially spaced several first guide rings, and damping ring is set between adjacent first guide ring, and its top is provided with internal thread;Middle beam tube, it is coaxially rotationally arranged on base, and the inner wall bottom of its is circumferentially provided with second guide ring, and second guide ring is abutted on the surface of spiral seat, damping ring, and first guide ring is abutted on the annular recess of middle beam tube inner wall, and the inner wall middle part of middle beam tube is provided with guide plate, and the central part of guide plate is provided with guide port;Lifting bead, its top is provided with the positioning seat for salve placement, and its bottom can be vertically moved through guide port and is provided with stud screwing with internal thread;Cover, it is sleeved and positioned on base.The utility model can solve the problem of poor hand feeling and unstable structure positioning of existing salve tube.

The present application relates to the technical field of accelerator radiation protection, and particularly relates to a method for evaluating induced radioactivity of a beam tube of a particle accelerator; the method aims to evaluate the induced radioactivity of the beam tube of the accelerator under a multi-cycle operation mode, to provide a reference for radiation protection of the accelerator, optimization of the operation mode, and development of a maintenance plan for the staff; the method considers the operation mode of the accelerator, adopts Monte Carlo simulation software, calculates the activity concentration of radionuclides in the beam tube, the dose rate of a focus point, and the dose received by the staff at the focus point during long-time maintenance, predicts the future induced radioactivity, thereby effectively promoting the application of the Monte Carlo method in the field of accelerator radiation protection, and providing technical support for radiation protection and operation maintenance of the accelerator.

The invention discloses a fluctuation type light and dark substance detection superconductive resonant cavity which comprises a cavity body, a plurality of beam tubes and a plurality of antennas, the beam tubes are led out from the cavity body, the number of the antennas is matched with the number of the beam tubes, each beam tube penetrates into the cavity body, a pumping mode is fed into the cavity body, the pumping mode transitions to a signal mode, and the cavity body is connected with the cavity body. The antenna is also configured to extract a signal pattern signal. Two orthogonal degenerate high-order modes of a TE021 mode and a TM110 mode are arranged in the cavity, an electric field of the TE021 mode and an electric field of the TM110 mode are orthogonal in the cavity, the antennas are coupled with the electric field of the TE021 mode and the electric field of the TM110 mode, and the antennas are orthogonally arranged. According to the fluctuation type light and dark substance detection superconductive resonant cavity, the cavity structure of the superconductive resonant cavity is optimized, the overlap ratio of a pumping mode and a signal mode is improved, meanwhile, the antenna is arranged in an orthogonal mode, the coupling degree of the pumping mode and the signal mode is reduced, the signal extraction precision of the signal mode is improved, and the dark substance detection precision is improved.

The invention discloses a goaf nitrogen injection pipeline and monitoring beam tube burying method. The goaf nitrogen injection pipeline and monitoring beam tube burying method comprises the steps that the heat dissipation zone width and the oxidation zone width of a goaf are obtained; calculating to obtain the number of nitrogen injection pipelines and the number of monitoring beam tubes; determining a pipeline embedding step pitch according to the width of the oxidation zone; a nitrogen injection pipeline and a monitoring beam tube are buried, the outlet end of the nitrogen injection pipeline is located in the oxidation zone, and an air inlet of the monitoring beam tube is located in the oxidation zone; the heat dissipation zone and the oxidation zone move along with the movement of the coal face, and the nitrogen injection device is communicated to the next section of nitrogen injection pipeline entering the oxidation zone while being disconnected from the nitrogen injection pipeline moving out of the oxidation zone; and when the air extractor is disconnected from the monitoring beam tube moved out of the oxidation zone, the air extractor is communicated to the next section of monitoring beam tube entering the oxidation zone. According to the goaf nitrogen injection pipeline and monitoring beam tube embedding method, reasonable tube distribution, accurate nitrogen injection and effective monitoring can be achieved, the fire prevention and extinguishing efficiency is improved, and the fire prevention and extinguishing cost is reduced.