10388 results about "Bolt connection" patented technology

The invention discloses a bolt looseness online monitoring method and system, and the method comprises the steps: collecting an original data set containing a vibration signal of bolt connection, temperature gradient data and structural stress distribution through a multi-mode sensor array, and carrying out the time-space alignment and frequency domain decomposition processing of the original data set, obtaining a multi-dimensional feature matrix of the bolt nodes; based on the multi-dimensional feature matrix, a graph neural network model is adopted to carry out bolt looseness probability calculation, and a real-time looseness probability value of each bolt is output; generating a risk level map based on time evolution according to the real-time loosening probability value; and the risk level map is mapped in real time through a three-dimensional visual interface, and when it is detected that the bolt loosening risk level exceeds a preset threshold value, an early warning message is generated and uploaded to an operation and maintenance platform, and closed-loop monitoring response is completed. According to the embodiment of the invention, accurate assessment, dynamic prediction and visual early warning of the loosening risk can be realized, and the intelligent level of structure safety monitoring is improved.

The invention discloses a bolt on-line monitoring method and system, and the method comprises the steps: generating a micro-motion feature matrix of a bolt according to a multi-dimensional vibration signal and a stress wave propagation characteristic of a bolt connection part; based on the micro-motion characteristic matrix, fusing local stress distribution data acquired by a bolt surface strain gauge, and outputting a health state quantitative index of the bolt; outputting a loosening risk level according to the health state quantitative index and historical loosening evolution data; and based on the looseness risk level and in combination with equipment operation state parameters, a self-adaptive decision tree model is adopted to dynamically adjust monitoring frequency and an alarm threshold value, a real-time monitoring strategy and a visual early warning report are generated, and a wireless transmission module is synchronously triggered to upload the real-time monitoring strategy and the visual early warning report to a cloud operation and maintenance platform. According to the embodiment of the invention, high-precision, self-adaptive and traceable bolt health state evaluation and early warning can be realized.

The embodiment of the invention provides a bolt and bolt group monitoring method and device, and a bolt looseness detection system is constructed by combining an engineering mechanical model and a multi-source image analysis technology. According to the method, detection units are divided, a stress distribution model is established, median filtering and a bolt segmentation model are used for processing two-dimensional image data, depth image data are analyzed in combination with a binocular depth estimation algorithm based on parallax consistency check, and accurate recognition of the position and state of the bolt is achieved. The system judges transverse and longitudinal loosening states through comparative analysis of measured average angles and distances, and evaluates the influence of loosening propagation. According to the method, the defects of the traditional technology in the aspects of detection efficiency and precision are effectively overcome, and reliable technical support is provided for safety monitoring of the bolt connection structure.

The invention discloses a prefabricated wallboard assembly structure and an assembly method thereof, and relates to the technical field of building prefabricated wallboards, the prefabricated wallboard assembly structure comprises a first wallboard and a second wallboard, a plurality of inserting grooves are formed in one side of the first wallboard, and hydraulic expansion splicing mechanisms are symmetrically mounted in the inserting grooves up and down; the hydraulic expansion splicing mechanism is composed of a metal sleeve, meshing teeth, a sealing rubber ring, a piston and an oil injection mechanism, the metal sleeve and the inserting groove are welded and fixed, an oil cavity is formed in the metal sleeve, multiple sets of mounting grooves are formed in one end of the metal sleeve, four annularly-distributed sliding grooves are formed in the outer sides of the mounting grooves, and the sliding grooves are communicated with the oil cavity. A plurality of inserting blocks are arranged on one side of the second wallboard, connecting holes are formed in the inserting blocks in an up-down symmetrical mode, a plurality of meshing grooves are formed in the inner ends of the connecting holes, and the problem that most existing prefabricated wallboards are connected through bolts, stress concentration is prone to occurring, and consequently the structural stability is reduced is solved.

The invention relates to the technical field of parameter simulation, in particular to a parameterized simulation model design method based on a standard part structure. The method comprises the following steps: collecting bolt connection data of standard components in the wind generating set; blade surface vibration feature information is extracted according to the standard component bolt connection data; acquiring stress concentration distribution data at the joint based on the blade surface vibration characteristic information; calculating a local deformation accumulated value of the standard part according to the stress concentration distribution data at the joint; measuring the friction coefficient variation trend of the contact surface based on the local deformation accumulated value of the standard component; deducing pre-tightening force attenuation characteristics according to the change trend of the friction coefficient of the contact surface; and constructing a standard part fatigue damage prediction model based on the pre-tightening force attenuation characteristics. According to the method, the vibration characteristics of the blade surface are collected, the stress concentration distribution at the bolt connection position is indirectly extracted, and the bottleneck that the internal connection state is difficult to directly sense is broken through.

The invention relates to the technical field of battery box bodies, and discloses an ultrahigh-strength rolling steel battery lower box body and a production process thereof.The battery lower box body comprises a frame, a liquid cooling plate and a bottom protection plate which are sequentially arranged from top to bottom, sealant is arranged between the lower end of the frame and the liquid cooling plate, and the lower end of the frame and the liquid cooling plate are connected through a step-free double-layer rivet nut; sealing cotton is arranged between the liquid cooling plate and the bottom protection plate and connected through bolts. The frame is mounted on a vehicle body, and the battery is mounted in the frame. An outer edge beam, an inner beam and a vehicle body connecting mounting beam are produced by using an ultra-high-strength sheet 1.0 mm material with the elongation percentage being 5% or above through rolling, pipe coiling and other processes, the strength is guaranteed by designing a reinforced shape, meanwhile, the effects of light weight and low cost are achieved, and the cost of a moped enterprise is reduced, and the product competitiveness is improved; the bottom of the lower box body adopts a step-free double-layer riveting sealing structure, so that a double-layer sealing effect is achieved, a gap between a bottom protection plate and a liquid cooling plate is eliminated, sundries are prevented from being accumulated in a cavity, and the service life of the lower box body is prolonged.

The invention discloses a fabricated building module anti-seismic connection node structure, which relates to the field of fabricated buildings, is used for connecting beam columns and I-shaped beams, and comprises two connection plates symmetrically mounted at the end parts of the I-shaped beams; the fixing base is fixedly installed on the beam column, two symmetrically-arranged bearing parts are arranged on the fixing base, inserting grooves allowing the connecting plates to be inserted are formed in the bearing parts, and the connecting plates are connected with the bearing parts through bolts; the N first friction pieces are arranged between the two bearing parts; the first friction pieces and the second friction pieces are distributed in a staggered mode to form a friction contact face, during an earthquake, displacement of the beam column and the I-shaped beam forces the first friction pieces and the second friction pieces to slide relatively, kinetic energy is converted into heat energy to be dissipated, meanwhile, the N first friction pieces and the N + 1 second friction pieces are staggered to form multi-point friction, and the friction contact face is formed. The energy consumption efficiency is gradually increased along with the displacement magnitude, the anti-seismic energy consumption capacity of the structure is greatly improved, and damage of an earthquake to a building structure is effectively reduced.

The invention discloses a blade bolt state monitoring system and method based on an acoustic emission technology in the technical field of state monitoring of wind power generation equipment. The method comprises the following steps: acquiring acoustic emission signal data of a blade bolt connection area acquired by an acoustic emission sensor array; sequentially carrying out preprocessing and feature extraction processing on the basis of the acoustic emission signal data, and then calculating a wavelet packet energy entropy value; judging whether a triggering condition of multi-sensor data fusion weighting judgment is met or not based on the wavelet packet energy entropy value; when any triggering condition is met, it is judged that the state of the bolt is abnormal, and after comprehensive state recognition is conducted through multi-sensor data fusion weighted judgment and modal acoustic emission wave velocity correction positioning, early warning information including the damage type, the severity degree and position information is output; when the triggering condition is not met, it is judged that the bolt state is normal, and circulating monitoring continues. According to the invention, accurate evaluation and early warning of the blade bolt state are realized through signal acquisition, processing, analysis and early warning.

The invention belongs to the technical field of wallboard assembly, and particularly discloses an assembly type wallboard hanging structure and a construction method thereof.The hanging structure comprises an installation groove, a hook, a hanging rod, a steel wire rope and a transferring and lifting assembly; the mounting groove is pre-formed in the bottom end of the structural beam, and a profiled groove is formed in the bottom end; the hook is pre-arranged at the upper end of the ALC wallboard and is clamped with the suspender; one end of the steel wire rope is detachably connected with the hook; and the transfer lifting assembly is connected with one end, penetrating through the mounting groove, of the steel wire rope, and lifts the ALC wallboard by tightening the steel wire rope, so that after the lifting rod is clamped into the hook, the two ends of the lifting rod are in contact with the mounting groove, and the ALC wallboard can move in the length direction of the mounting groove. The hanging structure is easy and convenient to operate and high in adaptability, the installation efficiency is greatly improved, the construction cost is reduced, and the construction complexity and the material damage risk caused by welding, nail shooting or bolt connection are effectively avoided.

The utility model provides a sealing aging test device for multi-environment simulation. The sealing aging test device comprises an upper end cover, a lower end cover, a gasket, a to-be-tested sealing ring and a sealing ring, the gasket is arranged between each stage of lower end cover and the upper end cover, the to-be-tested sealing ring is arranged between each stage of lower end cover and the gasket, and the sealing rings are arranged between the gasket and each stage of upper end cover and between the middle upper end cover and the middle lower end cover; the end covers are connected through bolts, and the gaskets are in interference fit connection or threaded connection with the upper end covers; the end cover center hole channel forms a first flow channel, the outer side hole channel forms a second flow channel, and flow channel isolation is achieved through a sealing ring. The aging conditions of the sealing ring under different compression amounts can be tested by adjusting the thickness of the gasket, the influence of different unbalance loading forces on the aging performance of the sealing ring can be tested by adjusting the gradient of the first end face of the gasket, and the aging conditions of the sealing ring under different working conditions can be simulated by inputting media into the two flow channels. Multiple groups of upper and lower end covers can be continuously added in the device.

The invention discloses an inclined extrusion rack of a large-diameter cold-bending hollow section steel extrusion forming device, and belongs to the technical field of cold-bending hollow steel pipe machining. The inclined extrusion rack comprises a rack body, a feeding assembly is arranged on the right side of the rack body, a cut inclined feeding roller is arranged on the feeding assembly, and a working plate is connected to the inner wall of the rack body through bolts; and the lower surface of the working plate is fixedly connected with a lower connecting plate. According to the large-diameter cold-bending hollow profile steel extrusion forming device, in the working process, the rack body is fed through the feeding assembly, machining is completed in the rack body, at the moment, a scraping plate plays a role in scraping welding waste, meanwhile, a motor works, at the moment, a cleaning plate can move in the vertical direction, welding slag can be efficiently cleaned, and the working efficiency is improved. And meanwhile, the cleaning plate moves in the horizontal direction along the workpiece, welding slag can be swept down, the cleaning effect is better, the welding slag is not left, and the working efficiency is high.

The invention discloses a vibration type drain pipe crystal removal device, and particularly relates to the technical field of pipeline crystal removal, the vibration type drain pipe crystal removal device comprises a cylindrical main machine and a guide climbing frame, one end of the cylindrical main machine is in bolted connection with a propeller, and one end of the cylindrical main machine is provided with a crystal cleaning assembly used for layering and disintegrating crystals in a pipe; the crystal cleaning assembly comprises a conical guide frame and a driven guide ring frame which are movably connected to one end of the cylindrical main machine; a plurality of driving vibration rods and a plurality of driven vibration rods are respectively arranged outside the conical guide frame and the driven guide ring frame; according to the device, crystals in a pipeline are knocked in advance through the driving vibration rod and the driven vibration rod, the knocking target of the driving vibration rod and the driven vibration rod is a crystallization layer instead of a pipe wall, impact force is absorbed by the crystallization layer and does not directly act on a pipe wall body, and after the crystals are knocked to be loose, planing can be completed by the scraping tooth disc without applying too large force; and the scraping tooth disc further planes the fragments into fine chippings, so that the pipeline crystal removal efficiency is improved.

The invention discloses a two-chuck zero-tailing pipe cutting machine, and relates to the technical field of metal pipe machining equipment, the two-chuck zero-tailing pipe cutting machine comprises a cutting workbench, a clamping device and a feeding chuck, the clamping device is arranged on the cutting workbench, the clamping device comprises a working chuck, a first fixing plate and a second fixing plate, the working chuck is in bolt connection with the first fixing plate, and the first fixing plate is in bolt connection with the second fixing plate; a first sliding plate is in bolted connection with one side of the top of the first fixing plate, a visual sensor is fixed to the middle of the top of the first fixing plate, a first pushing block is slidably connected to the top of the working chuck, a rack is fixed to one side of the first pushing block, and the two sides of the first pushing block are slidably connected with the first sliding plate and the first fixing plate correspondingly. A first clamping jaw is connected to the top of the first pushing block through a bolt, a protection block is fixedly connected to the top of the first clamping jaw, two first air cylinders are arranged in the protection block, a piston rod is arranged in each first air cylinder, and a pressurizing clamping jaw is fixed to the top of each piston rod.

An electromechanical stretching apparatus of a convertible sofa consisting of a mechanical stretching apparatus and an electric actuator, the mechanical stretching apparatus provided with an electrically-driven connecting rod, where the electric actuator consists of a motor, a motor connecting tube, a motor movable slider, and a motor head fixing part, the motor adopted is a motor with a guide rail, the motor movable slider is installed on the guide rail of the motor, the motor head is rotationally connected through a second rotor shaft to the motor head fixing part fastened on the electrically-driven connecting rod, the motor connecting tube is connected to the motor movable slider through a first rotor shaft and the motor connecting tube is fastened on the mechanical stretching apparatus. The motor connecting tube is fastened on a linkage part of the mechanical stretching apparatus. The first and second rotor shaft are both a bolt.

The utility model discloses an easy-to-disassemble steel structure construction platform which comprises a plurality of rows of first frame bodies and second frame bodies, the first frame bodies and the second frame bodies enclose a steel pylon and are connected with each other, and the first frame bodies and the second frame bodies are respectively connected with the steel pylon through bolts. The first frame body comprises a first supporting plate in bolted connection with the steel pylon and provided with a plurality of first connecting screw holes and a first walkway located at the upper end of the first supporting plate, and the second frame body comprises a second supporting plate in bolted connection with the steel pylon and provided with a plurality of second connecting screw holes and a second walkway located at the upper end of the second supporting plate. A first guardrail and a second guardrail are arranged on the upper portion of the first walkway and the upper portion of the second walkway respectively, the first walkway is further provided with a climbing plate, the climbing plate is connected with a ladder stand arranged in the vertical direction in a penetrating mode, and the ladder stand is connected to other adjacent first frame bodies in the height direction in the vertical direction. According to the utility model, adverse effects on the steel pylon can be reduced, the construction platform is convenient to mount and dismount, the construction efficiency of the steel pylon is improved, the safety is high, and economy and practicability are realized.

The utility model discloses a shell device for spherical projection imaging, which comprises a transparent upper shell, a lower shell and a neck shell, the neck shell is arranged on one side of the upper shell far away from the lower shell, the neck shell and the upper shell are integrally formed, a bearing base is arranged on the inner bottom surface of the lower shell, the bearing base is provided with an accommodating groove, and the accommodating groove is communicated with the accommodating groove. A containing groove is formed in the neck shell and can contain a rolling bearing, the bearing base is in contact connection with the outer surface of the rolling bearing, a cable penetrating channel allowing a cable to penetrate is formed in the neck shell, a waterproof connector is arranged in the cable penetrating channel, the space among the waterproof connector, the cable penetrating channel and the cable is filled with sealant, and long groove holes which are oppositely formed are formed in the two sides of the neck shell. One end of the long slotted hole is connected with a suspension support through a bolt, and the other end of the long slotted hole serves as a glue pouring end. According to the utility model, the long slotted hole realizes dual purposes and convenience, can be used for being connected with a suspension bracket, and can also be used as a glue filling port, so that glue filling is accurately controlled, sealant waste is avoided, and the glue filling period is shortened.

The invention discloses a satellite deck coupling connection mechanism, a satellite and a satellite deck coupling connection method, belongs to the technical field of satellite structures, and particularly relates to the satellite deck coupling connection mechanism and the satellite deck coupling connection method. The problems of low assembly efficiency, uncontrollable thermal stress and difficulty in on-orbit maintenance in the existing bolt connection technology are solved; the mechanism comprises interlocking units which are arranged on the butt joint edges of the two cabin plates in pairs. The satellite cabin plate coupling connection mechanism, the satellite and the satellite cabin plate coupling connection method are applied to modular cabin plates of spacecrafts such as the satellite and the like, and bolt-free interlocking connection aims at overcoming the defects of traditional bolt connection in the aspects of rapid disassembly and assembly, thermal deformation adaptability and the like.

The utility model relates to the technical field of non-woven fabric processing, in particular to a non-woven fabric laminating device with a positioning function, which comprises a processing table, one end of the processing table is rotatably connected with a fabric unwinding frame and a protective film unwinding frame respectively, and the other end of the processing table is rotatably connected with a winding frame. First conveying rollers are rotationally connected between the cloth unwinding frame and the processing table, a first tensioning roller is rotationally connected between the first conveying rollers, and a spraying frame is connected to the surface of the processing table through bolts. According to the improved film laminating device, the limiting pieces sleeving the outer walls of the first conveying roller and the second conveying roller are matched with the scales on the surfaces of the roller bodies, the edges can be accurately positioned according to material specifications, material deviation is effectively avoided, and it is ensured that the positions of materials are accurate in the whole process from unwinding to winding; the cloth unwinding frame, the protective film unwinding frame and the winding frame are connected with the driving disc and the driven disc conveniently through the sleeving shaft, no complex tool is needed, the downtime is greatly shortened, and the production efficiency is improved.

The invention discloses a temperature influence compensation method and system in a passive bolt monitoring system, and belongs to the technical field of structural health monitoring, and the method comprises the steps: obtaining a resonant frequency signal of a passive bolt monitoring sensor and temperature data, collected by a preset distributed temperature sensing network, of a plurality of monitoring points; reconstructing a two-dimensional temperature field cloud picture of the bolt connection area through interpolation calculation; extracting an equivalent comprehensive temperature rise value from the temperature field distribution, and performing preliminary compensation on the resonant frequency signal to generate a preliminary strain value; calculating a virtual thermal strain value generated by temperature influence; and performing decoupling operation on the initial strain value based on the virtual thermal strain value to obtain a compensated real mechanical strain value, and accurately separating the real mechanical strain from the total measurement strain by adopting a method of reconstructing a two-dimensional temperature field of a bolt connection area and calculating a decoupling virtual thermal strain by utilizing a finite element analysis micro-simulation model. Therefore, the accuracy and reliability of bolt pre-tightening force monitoring are improved.

The utility model relates to the technical field of automobile parts, in particular to an automobile rubber damping bushing which comprises a metal shell, an upper cover is placed on the top of the metal shell, second threaded holes are formed in the upper side and the lower side of the metal shell respectively, and first threaded holes are formed in the two sides of the upper cover respectively. According to the automobile rubber damping bushing, the upper cover and the lower cover can be conveniently mounted and dismounted by mounting the upper cover mounting mechanism and the lower cover mounting mechanism, internal parts can be conveniently replaced and maintained, the service life of the upper cover mounting mechanism is prolonged, the service life of the lower cover mounting mechanism is prolonged, the service life of the lower cover mounting mechanism is prolonged, and the service life of the lower cover mounting mechanism is prolonged. And meanwhile, a temperature sensor, a heating device, a heat dissipation plate and a heat transfer plate are installed, so that the performance of rubber bushing parts is prevented from being influenced by overheating and supercooling, and stable operation of the whole damping bushing is ensured.

The invention discloses an underwater wellhead angle adjusting tool and a using method thereof.The tool comprises a connecting disc, a connecting cylinder, a hydraulic cylinder and a hydraulic cylinder piston, the connecting cylinder is arranged below the connecting disc, the connecting disc is connected with a high-pressure wellhead feeding tool through bolts, and the high-pressure wellhead feeding tool is connected with a high-pressure wellhead; a hydraulic cylinder shell and a hydraulic cylinder piston of a hydraulic cylinder are arranged on the outer side of the connecting cylinder in a sleeved mode, the hydraulic cylinder piston moves downwards to drive a downward locking lining of the high-pressure well mouth to move downwards, the downward locking lining opens a locking ring of the high-pressure well mouth, and the high-pressure well mouth and the low-pressure well mouth are locked. According to the underwater wellhead angle adjusting tool, an angle-adjustable high-pressure wellhead is vertically installed on an inclined low-pressure wellhead, a hydraulic cylinder piston is controlled to move downwards through hydraulic drive, a downward locking bush is forced to open a locking ring, and the angle-adjustable high-pressure wellhead and the low-pressure wellhead are locked; hydraulic driving is achieved, and operation is easy; and well deviation is reduced, and installation of service tools, blowout preventers and Christmas trees is facilitated.

The invention discloses a bending device for an aluminized zinc plate, and relates to the technical field of aluminized zinc plate processing equipment, and the bending device is technically characterized by comprising a processing table and a groove formed in the top of the processing table, an indentation prevention mechanism is arranged in an inner cavity of the groove, and the indentation prevention mechanism comprises an H wheel carrier connected to the processing table through a bolt; through the roller, a rubber sleeve, a lubricating oil tank, an oil pumping pipe, a water pump, a transverse pipe, a flow dividing branch pipe and a spray head, comprehensive lubrication and protection in the bending process of an aluminum-plated zinc plate are achieved, direct contact of metal is effectively avoided, and the aluminum-plated zinc plate can be conveniently and rapidly bent. And meanwhile, through the design of the V-shaped groove and the recovery pipe, lubricating oil can be recycled, the consumption of a lubricating agent is reduced, the environmental pollution is reduced, the continuous effectiveness of a lubricating system is ensured, and therefore the bending quality and the production efficiency of the aluminum-plated zinc plate are remarkably improved.

The invention belongs to the technical field of pile foundation protection cylinders, and discloses a combined pile foundation steel protection cylinder which comprises a plurality of sets of steel protection cylinder bodies, first auxiliary positioning assemblies and second auxiliary positioning assemblies, and the first auxiliary positioning assemblies and the second auxiliary positioning assemblies are installed at the two ends of each set of steel protection cylinder body. A butt joint inner pipe is integrally formed at the lower end of each steel casing body, a butt joint inner groove allowing the butt joint inner pipe to be connected in an inserted mode is formed in the upper end of each steel casing body, and the steel casing bodies, the hidden side grooves, the hexagonal connecting bolts, the butt joint inner pipes and the butt joint inner grooves are arranged, so that the adjacent combined steel casing bodies are matched through the butt joint inner pipes and the butt joint inner grooves; the hexagonal connecting bolts penetrate through the mounting holes and the second screw holes to tightly connect the adjacent steel casings, the gaskets in the hidden side grooves can improve the stability of bolt connection, looseness is avoided, various external force in the pile foundation construction process can be effectively borne, the stability of the whole structure of the steel casings is guaranteed, and the construction risk is reduced.

A packer assembly includes (a) a mandrel bearing an expandable packer element, the mandrel having a ratchet section, a lower collet retaining shoulder, and defining a plurality of longitudinal slots; (b) a push sleeve connected to a ratchet ring by at least one shear pin, wherein the ratchet ring is disposed between push sleeve and the mandrel and engages the mandrel ratchet section; (c) a shift sleeve comprising an inner shift sleeve slidingly disposed within the mandrel and having a lower collet, the inner shift sleeve defining a profile for engaging a shifting tool, and an outer shift sleeve slidingly around the mandrel and connected to the inner shift sleeve with a plurality of bolts, wherein each bolt passes through a longitudinal slot defined by the mandrel; (d) wherein the shift sleeve and push sleeve is moveable between a running position and a released position. Also disclosed are methods of using a packer actuated by a sliding sleeve.

The invention discloses a welding machine for stainless steel pipeline pipe fitting machining, and belongs to the technical field of stainless steel pipeline welding. The welding machine comprises a machine body, a vertical plate is arranged on the upper surface of the machine body, a motor is connected to the surface of the vertical plate through bolts, a mechanical arm is arranged on the upper surface of the machine body, and the machine body completes welding through the mechanical arm; the output end of the motor is fixedly connected with a connecting shaft; a supporting block is arranged on the upper surface of the machine body, and a long pin is rotationally arranged in the supporting block. According to the welding machine for stainless steel pipeline pipe fitting machining, when a pipeline needs to be clamped, the pipeline is placed on a lower clamping plate, then an upper clamping plate is rotated, after an auxiliary plate enters a connecting block, a clamping block enters a clamping groove, at the moment, the pipeline is clamped and fixed through the upper clamping plate and the lower clamping plate, and in the working process, a motor can drive the pipeline to rotate; and meanwhile, the cleaning plate is in a working state, so that the welding slag is not adhered to the machine body, and the cleaning of workers is facilitated.

The invention discloses an integrated steel formwork operation platform applied to open caisson construction. The integrated steel formwork operation platform comprises an outer formwork, an inner formwork, an outer operation platform, an inner operation platform and opposite-pull screws. The operation platform is integrated on the steel mold through bolt connection, the protective fences are arranged inside and outside the operation platform, and constructors stand on the operation platform to carry out operation such as inner and outer mold plate installation, steel bar binding and water-stop belt welding, so that the risk of safe operation is greatly reduced, and the construction efficiency is improved; the steel die assembly is fixedly connected with the well wall through split bolts, after a section of the open caisson wall is manufactured, maintenance is conducted till the designed strength is achieved, sinking is started, a lower die plate needs to be dismantled before sinking, the uppermost layer die plate is reserved to serve as a supporting point for later steel die installation, and after the steel die sinks to the preset height, the dismantled steel die is horizontally moved and installed to the position above the upper layer die plate. The lower section of well wall can be manufactured; repeated erection and disassembly of the scaffold in the construction process are avoided, the construction safety risk is reduced, and the construction period is shortened.

The invention discloses a three-chuck zero-tailing pipe cutting machine, and relates to the technical field of pipe machining equipment, the three-chuck zero-tailing pipe cutting machine comprises a rack and a middle chuck, the middle chuck is located on the rack, the middle chuck comprises two sets of first clamping jaws and two sets of second clamping jaws, the top of each set of first clamping jaws is fixedly connected with a protection block, and a first air cylinder is arranged in each protection block; three sets of driving wedge blocks are fixed to the inner side of the first air cylinder, each set of driving wedge blocks are horizontally arranged in the vertical direction of the axis of the first air cylinder, one side of each set of driving wedge blocks is in contact connection with a driven wedge block, the inclined face of each driven wedge block is matched with the inclined face of the corresponding driving wedge block, and a pressurizing clamping jaw is fixed to one side of each driven wedge block. An air inlet pipe and an exhaust pipe are arranged on the outer side of the first air cylinder, a baffle is connected to the outer side of the protection block through bolts, the air inlet pipe and the exhaust pipe penetrate through the baffle, and through holes are formed in the two ends of the protection block.

The utility model discloses a precision spherical surface anti-vibration sizing block, which relates to the technical field of spherical surface sizing blocks, and comprises a sizing block shell and a spherical surface support table, the top of the sizing block shell is provided with a sizing block hole, a sliding wedge-shaped block is arranged in the sizing block shell, the top surface of the sliding wedge-shaped block is matched with a lifting wedge-shaped block, the top of the lifting wedge-shaped block is fixedly provided with a lifting column, and the lifting column is provided with a lifting hole. The lifting column penetrates out of the sizing block hole and is fixedly provided with a bearing plate, a column body is fixed to the bearing plate, a spherical concave face is formed in the top of the column body, a spherical convex face is formed at the bottom of the spherical supporting table and is matched with the interior of the spherical concave face, the column body comprises a fixed half-type column and a detachable half-type column, the fixed half-type column is fixed to the bearing plate, and the detachable half-type column is fixed to the bearing plate. The detachable half-type column is connected with the fixed half-type column through a bolt, and the spherical supporting table is matched with the column body through a spherical surface, so that the spherical supporting table has the fine adjustment freedom degree and can adapt to the uneven inclination angle of the bottom face of a machine tool, the contact area between the spherical supporting table and the machine tool is large, and therefore the supporting effect is improved.

The utility model discloses a differential assembly axial clearance detection device, which comprises a support frame, a base arranged on the support frame, an upper positioning tray arranged on one side of the base, a differential assembly arranged on one side of the upper positioning tray, and fixing mechanisms arranged on the support frame and on two sides of the differential assembly, the fixing mechanism is connected with the detection control mechanism, the base is fixedly installed on the supporting frame, the upper positioning tray is fixedly installed on the base, and the differential mechanism assembly is connected with the upper positioning tray through bolts. The beneficial effects of the utility model are that the device can be used for measuring the axial clearance, the efficiency is higher, the speed is faster, the labor force is reduced, and the device is stable and reliable.