205results about How to "Strong reliability" patented technology

The invention discloses a pole climbing robot for a wind power tower pole, which is characterized in that the robot mainly comprises a robot body, 4-8 pole climbing mechanisms, a snake-shaped swing arm and a movable studio, wherein the snake-shaped swing arm and the movable studio are mounted on one side of the robot body; the robot body is an annular body formed by combining two semicircular cambered bodies or three equal cambered bodies; the diameter of an internal ring of the circular body is matched with the diameter of the wind power tower pole; the pole climbing mechanisms mainly comprise upper foot wheels, lower foot wheels, connecting arms, driving gears, thrust screw rods, nut gears and supporting seats; the upper foot wheels are connected with the lower foot wheels by the connecting arms through wheel shafts; the connecting arms are connected with the thrust screw rods by connecting pin shafts on the connecting arms, and form movable hinges; the 4-8 pole climbing mechanisms are distributed in the circular robot body uniformly; the snake-shaped swing arm consists of three swing arm parts, namely a large arm, a middle arm and a small arm; and the movable studio comprises two paralleled linear guide rails, a walk driving device and an operation room.

The invention discloses a multichannel broadband receiver, and belongs to the technical field of microwave radio frequency and electronic control, the multichannel broadband receiver comprises a multichannel down-conversion assembly, a local oscillator power component, a power interface control panel and a VPX connector, the down-conversion assembly adopts a cavity-divided integrated structure, multiple identical radio frequency links are arranged in the same cavity in parallel, and the VPX connector is connected with the local oscillator power component. Down conversion from a 2-18GHz radio frequency signal to a 1.3-2.3 GHz intermediate frequency signal is realized through two-stage frequency mixing; the power supply interface control board takes an FPGA as a core, integrates the functions of multi-path power supply conversion, driving isolation, state monitoring and the like, and realizes channel gain power failure storage and calling, BIT self-inspection, nanosecond rapid turn-off and multi-parameter real-time monitoring through software and hardware cooperation. Through collaborative innovation of the structure, circuit and control, high integration, high channel consistency, high isolation and high intelligence of the multi-channel receiver are realized, and the multi-channel receiver is suitable for the fields of high-performance radars, electronic countermeasures and the like.

The utility model discloses a pedal lock device for rail transit. The pedal lock device comprises a mechanical lock mounting bracket, a lock hook, a lock hook mounting shaft, a stay wire disc, a stop mounting shaft, a mechanical lock stop block, a switch bracket, a switch base plate, an electromagnet and a pull plate, the lock hook mounting shaft, the stop mounting shaft, the switch base plate and the electromagnet are mounted on the mechanical lock mounting bracket; the lock hook and the stay wire disc are correspondingly matched with the lock hook mounting shaft and the stop mounting shaft respectively; the switch support is fixed to the mechanical lock stop block, one end of the mechanical lock stop block is matched with the stop mounting shaft, and the other end of the mechanical lock stop block is connected with the pulling plate. The pedal is automatically opened through the electromagnet, the requirement for automatically opening the evacuation device on the lower side of the passenger room door in emergency is met, and passengers can conveniently open the door to escape under the condition of power loss and air loss.

The invention relates to the technical field of molecular breeding, and discloses a molecular marker related to the LDL-C level of porcine serum, a detection reagent and a breeding method. The invention also discloses a primer group for identifying the molecular marker, and the primer group is used for amplifying the following SNP sites: SNP01, which are obtained on the basis of a pig reference genome Sscrofa11.1 and are positioned on 112bp, 008bp and 261bp of a third chromosome, and the genotype is A / G; sNP02 is located at 112bp, 008bp and 354 bp of a third chromosome, and the genotype of SNP02 is A / G; sNP03 is located at 112bp, 008bp and 583bp of the third chromosome, and the genotype of SNP03 is A / G. The primer group for identifying the molecular marker can quickly and effectively identify the LDL-C level of pig serum, and is used for assisting in breeding pig strains with low cholesterol or specific lipid metabolism characteristics.

This invention relates to the field of atmospheric monitoring technology, and more particularly to a carbon dioxide collection device for atmospheric monitoring, comprising: a support tube; a fixed bracket, conical in shape and fixed to the top of the support tube; a housing, fixed to the upper surface of the fixed bracket, for accommodating a filter assembly and forming a sampling airflow channel; a wind-adaptive air intake assembly, rotatably connected to the upper end of the housing, for automatically turning the air inlet to the leeward side; an air extraction power assembly, installed inside the fixed bracket, for forming a directional airflow inside the device; and a negative pressure storage tank, installed on the bottom plate of the support tube. This invention uses a vertical wing to drive the air intake square tube to automatically turn the air inlet to the leeward side, effectively avoiding direct wind and sand; the windbreak frame, driven by wind force, moves a limiting block to lock the fixing ring, stably locking the air intake square tube; this double windproof design avoids wind and sand intrusion, prevents airflow swaying, and ensures stable and reliable sampling.

A light weight artificial intelligence clamping and winding drum type part hoisting and lifting device, the trolley assembly is arranged at the top of the telescopic guide column mechanism, a rotary grabbing four-bar mechanism is arranged below the telescopic guide column mechanism, the rotary grabbing four-bar mechanism is used for grabbing shaft type parts, and an automatic identification control system is arranged below the rotary grabbing four-bar mechanism; the trolley assembly comprises a platform, end beams are arranged on the front and rear sides of the platform, a connecting beam is arranged between the two end beams, a wire rail is arranged on the connecting beam, a sliding block is arranged on the wire rail, the sliding block is hinged to a scissor fork mechanism, and an upper trolley frame is arranged at the top of the scissor fork mechanism; a three-in-one speed reducer motor is arranged on the end beam, an output shaft of the three-in-one speed reducer motor is connected with a lead screw, a lead screw nut is arranged on the lead screw, and the lead screw nut is also hinged to the scissor fork mechanism. The device has high integration degree, artificial intelligence degree and reliability, improves the man-machine operation mode, and can be matched with an automatic assembly line production frequency to complete hoisting and lifting operation.

This disclosure relates to a single-cylinder translation mechanism for a large semi-trailer and its usage method. The single-cylinder translation mechanism for a large semi-trailer includes a connecting seat, an active travel assembly, a follower travel assembly, a first limiting assembly, and a second limiting member. The active travel assembly includes a smooth support leg, a linear motion drive device, and a first connecting rod. The smooth support leg is hinged to the connecting seat. The first end of the linear motion drive device is hinged to the connecting seat, and the second end is hinged to the body of the first connecting rod. The follower travel assembly includes an anti-slip support leg and a second connecting rod. The anti-slip support leg is hinged to the connecting seat. The first limiting assembly is located on the smooth support leg and / or the anti-slip support leg. When the distance between the smooth support leg and the connecting seat is not greater than a preset distance, the anti-slip support leg is slidably connected to the smooth support leg via the first limiting assembly. When the distance between the smooth support leg and the connecting seat is greater than the preset distance, the sliding connection between the anti-slip support leg and the smooth support leg is broken. The second limiting member is fixed to the lower surface of the connecting seat.

The application discloses a method for judging the extension of the oil reservoir swept range of a microbial polymer system, and the steps are as follows: (1) taking the oil well samples in the oil reservoir before and after the microbial polymer flooding to perform the whole hydrocarbon gas chromatographic analysis of crude oil, and determining the small molecular weight light hydrocarbon marker component reflecting the change rule of the crude oil composition; (2) comparing the chromatographic peak area of the small molecular weight light hydrocarbon marker component with the chromatographic peak area of the high molecular weight carbon number, and obtaining the parameter for characterizing the effective action of the microbial polymer; (3) comparing and analyzing the crude oil samples in the oil well before and after the parameter for characterizing the effective action of the microbial polymer, and determining the swept degree of the oil reservoir by the microbial polymer. The application discloses the application of the above method in the microbial oil production for judging the swept volume of the microbial polymer in the oil reservoir.

The application belongs to the technical field of wearable devices, and particularly relates to smart glasses. The smart glasses comprise a glasses main body, a glasses leg and a first connecting sheet. The glasses main body is provided with a lens, and both ends of the glasses main body are provided with plug-in parts, the plug-in parts comprising plug-in grooves, and at least one recess structure is arranged on the first side wall of the plug-in groove. The glasses leg comprises a smart glasses leg, the smart glasses leg is provided with a smart component, and the end of the smart glasses leg facing the glasses main body is provided with a connecting part. The connecting part is fixedly connected with the first part of the first connecting sheet, the second part of the first connecting sheet is provided with at least one protruding structure, the protruding structure comprises an elastic structure, and the protruding structure and the recess structure are detachable, so that the user can realize the quick disassembly and assembly of the glasses leg and the glasses main body in a convenient and easy way, the disassembly and assembly feel good, and the reliability is high.

The application discloses a kind of silver carp variety specific SNP molecular marker combination, silver carp DNA fingerprint and application, the SNP molecular marker combination includes 367 SNP sites, the site information of the SNP molecular marker combination is as shown in table 1.The application takes silver carp germplasm resource as research object, obtains genotype by whole genome resequencing method, and then filters out 367 specific SNP markers capable of distinguishing different silver carp varieties, and the DNA fingerprint based on these markers can be used to distinguish different silver carp varieties.Compared with traditional methods, the fingerprint has the characteristics of high accuracy and strong reliability when used for silver carp variety identification.This technology not only provides strong support for the specific evaluation of silver carp varieties, the protection and management of breed rights, and the optimization and structure adjustment of silver carp breeding industry, but also shows good application prospects in the classification of silver carp germplasm resources, the confirmation of breed rights and the tracing of individual sources.

The utility model relates to the technical field of fresh flower packaging equipment, in particular to a bundling and stem cutting device for fresh flower packaging. The bundling and stem cutting device for fresh flower packaging comprises a rack, a bundling bottom plate is installed on the rack, an adhesive tape pulling assembly, a nail pressing assembly and an adhesive tape assembly are arranged above the bundling bottom plate, a stem cutting assembly is arranged below the bundling bottom plate, and the adhesive tape pulling assembly and the adhesive tape assembly are located on the two sides of the nail pressing assembly; the adhesive tape assembly is sequentially provided with an adhesive tape pre-tightening assembly, an adhesive tape tensioning assembly and an adhesive tape front clamping assembly along an adhesive tape advancing route, an adhesive tape connecting assembly is arranged on the outer side of the adhesive tape front clamping assembly, an adhesive tape shrinking assembly facilitating nail pressing is arranged on the outer side of the adhesive tape connecting assembly, and an adhesive tape cutter assembly for cutting off an adhesive tape is arranged at the nail pressing position of the nail pressing assembly. The fresh flower packaging machine is simple in structure, full-automatic integration is achieved, bundling and stem cutting are integrally designed, the fresh flower packaging efficiency is remarkably improved, and the labor cost is reduced.

The utility model provides a code-scanning article-picking control system, and belongs to the field of intelligent control systems. Comprising a control chip U3 of which the model number is STM32F103C8T6, the control chip U3 comprises 1-48 wiring pins, a control chip U2 of which the model number is HT7333-A, and a control chip U1 of which the model number is PM200-2-07-S-4. 3; a fifth wiring pin of the control chip U3 is connected with a PD0-OSCIN end, and the PD0-OSCIN end is grounded through an electrodeless capacitor C9; a sixth wiring pin of the control chip U3 is a PD1-OSCOUT end, the PD1-OSCOUT end is grounded through an electrodeless capacitor C11, and the PD0-OSCIN end and the PD1-OSCOUT end are connected through a quartz crystal oscillator X1. The system takes a single chip microcomputer as a processor, has the advantages of small volume, simple structure, convenience in use and higher reliability, and does not have a fault problem after long-time work.

The application relates to a WebGL-based three-dimensional local terrain protrusion weakening method, and belongs to the technical field of computer graphics visualization, which comprises terrain grid loading, loading terrain data in the form of a grid into a scene in a WebGL rendering engine, storing information in the form of a.terrain format binary file, then performing grid analysis, loading block terrain data according to a terrain level of detail strategy, analyzing terrain data, loading and analyzing downloaded binary file data according to terrain grid levels and row and column numbers, compressing the data by using a zig-zag coding method, then performing vertex height dynamic adjustment, and finally performing terrain triangular net reconstruction. The WebGL-based three-dimensional local terrain protrusion weakening method can weaken terrain protrusion problems by modifying the vertex elevation of a terrain data-free area, does not cause distortion of local high-precision terrain and models in a scene, can weaken terrain cliff problems existing in three-dimensional local terrain protrusions, and does not deform the terrain and models in the scene.

This invention discloses a method and system for evaluating the overturning resistance of flange plates, including a comprehensive evaluation method for the structural condition of concrete T-beam flange plates, and the dimensions and parameters of the flange plate overturning resistance test model, as well as the test method and evaluation method. This test and evaluation method can assess the damage state and overturning resistance of existing concrete T-beam flange plate structures, ensuring the safety of T-beam flange plate structures during operation.

This application provides a portable oil and gas well fluid level monitoring system and method, relating to the field of underground wellbore fluid level monitoring technology. The system includes: a virtual instrument platform configured with a LabVIEW-based program for casing pressure signal acquisition and control, a sound-generating device control program, and a sound wave signal acquisition program; a portable acquisition instrument including: a USB data acquisition card, a pressure transmitter, a sound-generating module, and a microphone; the pressure transmitter acquires pressure information at the inlet of a normally closed solenoid valve within the sound-generating module; when the pressure information reaches a preset pressure, a pressure ready signal is generated; when the pressure ready signal is valid, the sound-generating module is controlled to generate infrasound; and the infrasound reflection signal received by the microphone is acquired, processed by a MATLAB-based signal processing program, and displayed in the user interface of the sound wave signal acquisition program. The implementation method provided in this application is beneficial for improving the efficiency and safety of oil well production.

The application discloses a power transmission line crimping pipe X-ray detection device, system and method, which comprises the following steps: driving a detection module to reach a detection position through a lifting mechanism; driving the detection module to cover the crimping pipe detection range on the left and right sides in the same plane through a swing mechanism; or driving a first receiving plate and a second receiving plate to open through an opening and closing mechanism, and making the first receiving plate and the second receiving plate cover the crimping pipe detection range; and adjusting the angle of an emitter through a swing mechanism to make the emitter align with the first receiving plate or the second receiving plate. The detection position can be adaptively adjusted, the comprehensiveness and accuracy of detection are ensured, the traditional artificial tower climbing detection operation is replaced, and the intelligent detection operation level of the power transmission line crimping pipe is improved.

The utility model discloses an optical fiber FC-FC coupler mistaken power failure prevention control lock which comprises one-way rotation stopping ratchet teeth, a limiting spring bolt and a spring bolt control device. The spring bolt control device is arranged in the optical fiber junction box, the one-way rotation-stopping ratchet wheel teeth are coaxially arranged on the outer circle of an inner threaded sleeve, outside the optical fiber junction box, of the optical fiber FC-FC coupler, and one end of the limiting spring bolt is located in the optical fiber junction box and connected with the mechanical power output end of the spring bolt control device. And the other end of the limiting spring bolt extends out of the side plate of the optical fiber junction box and is clamped and matched with the one-way rotation-stopping ratchet teeth. According to the utility model, the micro motor is adopted to drive the connecting plate to rise through the eccentric shaft, the connecting plate synchronously drives the limiting spring bolt to rise to realize an unlocking function, the limiting spring bolt stops the one-way rotation-stopping ratchet wheel from unscrewing after locking, the optical fiber FC-FC coupler is effectively prevented from being broken by mistake, and the optical fiber FC-FC coupler is simple and compact in structure, strong in reliability and convenient to use. The safety and the management efficiency of the optical fiber equipment are effectively improved, and the method has important practical significance.

A ball-drop controlled core extraction tool and method are disclosed, relating to the field of core recovery. The ball-drop controlled core extraction tool includes an outer tube assembly consisting of a drill pipe joint, an outer tube, and a drill bit connection; and an inner tube assembly consisting of a ball-drop diverter, a torsion actuator, an inner core tube, and a core extractor connection. The core extractor includes an inner shaft sleeve connected to the inner core tube, an outer shaft sleeve, and multiple rotatable cutting blades. The ball-drop diverter selectively delivers mud simultaneously to the mud channel and torsion actuator between the outer tube assembly and the inner tube assembly, or pressurizes the mud and delivers it separately to the torsion actuator. The torsion actuator drives the outer shaft sleeve to rotate relative to the inner shaft sleeve during pressurized mud delivery, thereby driving the cutting blades to rotate synchronously and cut the core. The ball-drop controlled core extraction tool and method allow operators to easily use mechanical transmission to control the rotation of the cutting blades at the surface to cut and support the core.

The utility model discloses a dial indicator fixing clamp for motor detection, which comprises a flange plate, a motor shaft movably connected to the center of the flange plate, a circular screw fixedly connected to the upper end of the motor shaft, a first connecting rod fixedly connected to the upper end of the circular screw, and a rotating arm group movably connected to one end of the first connecting rod. The rotating arm group comprises two rotating arms, and the rotating ends of the two rotating arms are connected with each other; through the connection between the circular screw rod and the motor shaft, the cooperative use of the clamping ball and the universal groove, and the connection between the positioning clamping groove and the positioning clamping block, the overall connection has stronger stability and reliability, and is not influenced by factors such as vibration, temperature and an external magnetic field; it is ensured that the dial indicator is always firmly fixed to a designated position in the detection process, the risk of falling possibly occurring in a traditional magnetic attraction mode is effectively avoided, measurement errors caused by displacement of the dial indicator are eliminated, and the reliability of planeness data of the flange face is ensured.

This invention discloses a machining process for precision screws, belonging to the field of mechanical manufacturing technology. It includes the following steps: S1, rough machining and forming: treating the surface of the bar stock and machining functional slot structures, followed by pre-deburring; S2, structural strengthening: heat-treating the workpiece for strengthening; S3, precision finishing: correcting the form and position tolerances of the heat-treated workpiece and precision grinding each surface; S4, quality assurance delivery: completing inspection, cleaning, and packaging. This process flow is clear, employing a logical arrangement of "forming first, then strengthening, and then fine-tuning," resulting in a workpiece with not only a high-hardness surface but also improved coaxiality of its stepped axis and thread trajectory accuracy. This significantly enhances the screw's operational stability at high speeds. Furthermore, through staged quality control and precision correction, it improves the first-pass yield of the workpiece and reduces the risk of scrap due to heat treatment deformation, possessing extremely high industrial application value.

The utility model relates to the technical field of stocker cargo carrying tables, and discloses a sensor mounting structure of a stocker cargo carrying table, which comprises a cargo carrying table main body, a first aluminum alloy beam is fixedly mounted on the left side of the cargo carrying table main body, and a second aluminum alloy beam is fixedly mounted on the right side of the cargo carrying table main body; the code scanner is fixedly mounted on the back surface of the cargo carrying table main body; and the camera support is fixedly installed on the top of the second aluminum alloy beam, and a camera is fixedly installed on the inner wall of the camera support. According to the utility model, through the design of the sensor layout mechanism and the cooperation of the groove-shaped photoelectricity and the limit switch, compared with the common diffuse reflection photoelectricity, the groove-shaped photoelectricity has the advantages of strong anti-interference capability, various specifications and styles, higher intelligence and higher reliability due to the special structural design, and compared with the existing scheme, the limit switch has the advantages that the structure is simple and the cost is low. And in the aspect of emergency braking treatment, braking treatment is quicker and more efficient, so that the safety can be further improved.

The utility model provides an elbow and a heat exchanger thereof, the elbow is used for being matched with an internal thread pipe of the heat exchanger, and the elbow comprises a pipe part; the plurality of flaring parts are connected with one another through the pipe parts; and the plurality of flaring parts are sleeved on the internal thread pipe, so that the elbow is fixed on the heat exchanger. According to the utility model, the internal thread pipe does not need to be flared and is more stable, and the process efficiency is improved.

The present application belongs to the field of drilling fluid performance testing technology in the oil and gas industry, and relates to a simulation wellbore filtration loss measuring and filter cake evaluating device and a test method thereof. The simulation wellbore filtration loss measuring and filter cake evaluating device is composed of a base, a simulation wellbore outer tube, a supporting mechanism, a laser sensor, a laser sensor controller, a simulation wellbore inner tube, a driving mechanism, a liquid storage mechanism, a pressurizing mechanism and a heating mechanism. The use of the present application can reflect the dynamic filtration loss of the drilling fluid and test the filter cake erosion resistance for evaluating the filter cake quality. The simulation wellbore outer tube of the present application is made of transparent material resistant to high temperature and high pressure, and the filtration loss of the drilling fluid, the formation and destruction process and morphology of the filter cake under the conditions of fluid flow, nozzle injection, simulation wellbore inner tube and inner tube coupling agitation can be observed by visual observation. The present application has high simulation degree, simple operation, stable performance and strong reliability.

The utility model discloses a long endurance and easily deploy data acquisition house, including bottom plate, the edge side fixed mounting of bottom plate top has the protection wallboard, the front side and rear side of protection wallboard top all have seted up solar panel limiting slot, the utility model relates to sensor data acquisition technical field. The long endurance and easily deploy data acquisition house, through the installation lithium cell with the utilization battery compartment connecting table, and install polycrystalline solar panel for lithium cell power supply, not only reduced the installation quantity of battery and alleviated the weight of whole, and this power supply mode greatly increased the endurance, very large extent solved the problem of short endurance, and in the battery compartment main part and the periphery and bottom of inductor deposit storehouse, utilize the protection wallboard and close, prevent the influence protection inductive component and the normal operation of battery of the aging and humid environment that solar exposure brings.

This invention discloses a telescopic outrigger system and a crane. The telescopic outrigger includes a fixed outrigger box with one open end and a movable outrigger fitted inside the fixed outrigger box. The movable outrigger is driven to extend or retract by a horizontal hydraulic cylinder. The front and rear panels of the fixed outrigger have through holes for a drive shaft to pass through. The movable outrigger has a transverse U-shaped plate in the middle. When the movable outrigger extends or retracts, it avoids the drive shaft passing through the through holes by passing through the U-shaped plate. The closed side of the U-shaped plate has a support block for overlapping the top and bottom plates of the U-shaped plate. The movable outrigger has a drive mechanism that drives the support block to approach the end opening or through hole of the fixed outrigger box when the movable outrigger extends or retracts. The through hole allows the drive shaft of the transmission system to pass through. The support block is driven to approach the end opening of the fixed outrigger box. The movable outrigger extends out of the support block and is located on the opening side of the U-shaped plate, overlapping its top and bottom plates to compensate for the load-bearing capacity lost by the movable outrigger. The support block is driven to approach the through hole, and the movable outrigger is fully retracted and hidden.

The application discloses a kind of high protein yoghourt production energy-saving cooling device, belong to yoghourt production equipment technical field.Device includes conveying pipe, cooling cavity, vibration cavity, cooling cavity is sleeved in the outside of conveying pipe, and the outer wall of conveying pipe is equipped with circumferential array spiral groove, spiral vibration cavity is embedded in groove, and cavity body two ends are respectively communicated with air inlet pipe and air outlet pipe.Cooling cavity is equipped with coiled cooling pipe inside, and cooling pipe is positioned by fixed ring, and it is constituted stable damping structure by collocating support plate and shock absorber, and fixed ring is equipped with rubber ring with array through hole between conveying pipe, can improve damping effect.Vibration cavity inside is connected in series with multiple groups of vibration body with eccentric flywheel, can generate high-frequency micro-vibration, continuously disturb viscous yoghourt, avoid material adhesion and block pipe.The present application relies on spiral flow guide and vibration disturbance structure, solve the problem that high protein yoghourt is not uniformly cooled, is easy to accumulate and coagulate, effectively improve the efficiency of heat exchange, reduce production energy consumption, equipment runs stably, adapts continuous production, effectively guarantee yoghourt quality.

The invention provides a fan capable of preventing an impeller from loosening, and relates to the field of fans, the fan comprises a main shaft, the impeller mounted on the main shaft, a shell for accommodating the impeller, a driving device, an anti-loosening mechanism and a transmission isolation mechanism; the anti-loosening mechanism comprises a centrifugal triggering assembly and an axial locking assembly. The centrifugal triggering assembly comprises a mounting base and a centrifugal sliding block, the mounting base is arranged on the impeller, and the centrifugal sliding block is arranged on the mounting base; the axial locking assembly comprises a force bearing seat and a centrifugal pressing block, the force bearing seat is arranged on the main shaft and located on the axial side of the impeller, and the centrifugal pressing block is movably arranged on the force bearing seat. The transmission isolation mechanism comprises a flexible coupler and a supporting bearing set, the flexible coupler is arranged between the driving device and the main shaft, and the supporting bearing set is arranged between the machine shell and the main shaft. The impeller is actively and dynamically prevented from loosening, and through systematic design, the operation stability, the safety reliability and the maintenance convenience of the fan under complex working conditions are remarkably improved.

This utility model discloses a structure for a secondary lining in a mined tunnel that also serves as a shield tunneling starting reaction device. It includes a first primary support, a first secondary lining inside the first primary support, a second secondary lining on the sides of the first primary support and the first secondary lining, mortar anchor bolts on the outer side of the second secondary lining, a second primary support outside the second secondary lining, a shield machine front face on the right side of the first primary support, fiberglass anchor bolts inside the shield machine front face, and a concrete island platform at the bottom of the inner wall of the first secondary lining. The unit price of concrete is much lower than that of steel, and by utilizing the stress characteristics of concrete, costs are saved. Using a reinforced concrete structure reduces the structural dimensions and working space of the steel support, avoiding large-scale excavation. Furthermore, the reinforced concrete ring beam can later serve as a permanent secondary lining structure, reducing subsequent demolition, cutting, and other procedures and labor costs, further saving costs.

The utility model provides a kind of high-side switch control circuit based on PTC heater, comprising: comparison circuit and high-side switch circuit;Comparison circuit includes first resistance, second resistance, third resistance, third capacitor and comparator, and the one end of first resistance is respectively electrically connected with the one end of second resistance, the positive phase input end of comparator, and the other end of second resistance is grounded;The one end of third resistance is respectively electrically connected with the one end of third capacitor, the inverting input end of comparator;The output end of comparator is electrically connected with the input end of high-side switch circuit.The circuit of this embodiment works cooperatively through comparison circuit and high-side switch circuit, realizes accurate control and multiple protection functions to heating process, without software control, to reduce the use cost.Comparison circuit accurately judges heating signal and exports control signal;With simple structure, strong reliability, good stability and long service life and the like advantages.

This invention discloses an isolated, fully soft-switching AC-DC-AC converter with primary and secondary side co-multiplexing and a modulation method. The converter includes a front-stage AC-DC converter, an intermediate-stage full-bridge LLC resonant converter, and a rear-stage DC-AC converter. This invention multiplexes the primary-side bridge arm of the full-bridge LLC resonant converter with the output bridge arm of the front-stage AC-DC converter, and the secondary-side bridge arm with the input bridge arm of the rear-stage DC-AC converter, forming an integrated AC-DC-AC converter structure, thereby reducing the number of components. Simultaneously, it employs PWM and phase-shift modulation strategies to control the inductor current of the four-transistor Buck-Boost circuit into a quadrilateral inductor current, thus achieving soft switching of all switching transistors. This topology is suitable for isolated AC conversion scenarios, enabling soft switching of switching devices, electrical isolation, wide-range voltage regulation, and effectively reducing the number of components. It also offers advantages such as high power density, high conversion efficiency, and high reliability.