51 results about "Macro-engineering" patented technology

The present application relates to the technical field of project management, and discloses an integrated management system and method for a large-scale project. The system comprises: a budget subsystem, used for obtaining target project information, and carrying out multi-level classification processing and coding processing on the target project information to obtain budget codes; a contract management subsystem, used for decomposing the target project information, generating a plurality of project contracts and associating the plurality of project contracts with the budget codes; a construction management and control subsystem, used for splitting the project contracts to obtain unit projects, encoding the unit projects to obtain unit codes, and associating quantity data corresponding to the unit projects with a preset construction drawing list; and a joint control subsystem, used for carrying out joint control on the project cost, the project progress and the project quality on the basis of a measurement visa so as to carry out integrated management on a large-scale project. The present application realizes integrated management of large-scale project construction.

The invention provides a concrete crack prevention and control method and system based on digital twinning simulation, and relates to the technical field of digital twinning, and the method comprises the steps: building a digital twinning model of mass concrete, and simulating the temperature and stress development process of the mass concrete based on a thermal-mechanical coupling relation to predict the crack risk; generating an anti-crack strategy based on the predicted crack risk; and controlling intelligent maintenance equipment to execute the anti-cracking strategy so as to prevent and control concrete cracks. According to the method, the digital twin model of the mass concrete is constructed, dynamic evolution of temperature and stress is accurately simulated in combination with the thermal-mechanical coupling relation, the crack risk is effectively predicted, and prevention and control scientificity and accuracy are remarkably improved. The generated anti-crack strategy can guide intelligent maintenance equipment to realize automatic and precise maintenance operation, the manual intervention cost is reduced, and the crack occurrence probability is reduced, so that the durability and safety of a concrete structure are improved, and reliable technical support is provided for a large-scale engineering project.

The invention belongs to the field of engineering materials, and discloses an ultrahigh-strength steel plate with yield strength of 1500 MPa for engineering machinery and a manufacturing method of the ultrahigh-strength steel plate. Through reasonable component design and combination with proper rolling reduction, finish rolling temperature and quenching temperature, the microalloying effect of Nb, V and Ti is fully utilized, ultra-fine grain martensite is obtained, the effects of fine grain strengthening, precipitation strengthening and dislocation strengthening are fully exerted, the effects of C and alloy are exerted, and the Q1500 steel plate with the low carbon equivalent CEV is obtained. By means of the process, the high-strength steel plate which is good in production performance, easy to weld, 5-20 mm thick, 1500 MPa in yield strength and used for engineering machinery can be stably produced, and the high-strength steel plate is widely applied to large engineering machinery equipment such as crawler cranes and wheeled cranes.

The invention discloses a conflict quantification and priority evaluation method and system for 4D construction, and relates to the technical field of large-scale complex project management, and the method comprises the steps: obtaining a 4D construction operation space data set integrating space and time attributes in a construction process, carrying out the uniqueness screening of a process group, detecting and quantifying the conflict of the construction operation space, and carrying out the priority evaluation of the 4D construction operation space; screening out construction process groups with conflict relations; time conflict detection is carried out according to the time domain data corresponding to the construction process groups with the conflict relation, space conflicts are screened through the time conflicts, meanwhile, for each conflict obtained through screening, the conflict priority is given according to the time overlapping rate and the space overlapping rate, and a conflict grading report is generated. The method can deal with the characteristics of complex design, many building participants, many process intersections and the like in a large-scale construction project; in the preorder stage of design and construction, various potential conflicts are pre-judged in advance, and the defects of conflict processing in large-scale engineering in the prior art are effectively overcome.

Disclosed is a method for detecting an austenitic weld based on an ultrasonic-magnetic combination technique, and belongs to the field of non-destructive testing technique, comprising dividing the austenitic weld into a plurality of zones along a thickness direction to obtain divided zones; detecting the divided zones based on phased array ultrasonic testing (PAUT) and weak magnetic detection; and determining priorities of the PAUT and the weak magnetic detection according to a position of each of the zones, a defect type and a position of a zone in which a defect is located. The method integrates the PAUT technique and the weak magnetic detection technique to address issues such as missed detection, incomplete coverage, and the inability to detect defects when using an ultrasonic method for detecting the austenitic weld, thereby providing technical assurance for the application of austenitic stainless steel materials in high-end equipment and large-scale projects.

The invention relates to the technical field of waste utilization, and particularly discloses a novel composite material and a shortcut construction device.The novel composite material comprises soil particles and gravel particles; the volume ratio of a single soil particle to a single gravel particle is (2-3): 1; the mass ratio of the soil particles to the gravel particles is (1-1.5): 1. According to the novel composite material and the shortcut construction device, waste soil resources can be used for building a temporary shortcut in a large engineering project, utilization of waste soil is effectively improved, use of concrete is reduced, the engineering cost is reduced, and the construction efficiency is improved.

The invention discloses an isogeometric transient dynamics topological optimization method and system of a functional gradient plate structure, and belongs to the field of topological optimization design of functional gradient structures. According to the method, the problems of collaborative optimization of the gradient direction in the gradient material plane and the multi-material structure topology under the transient load effect and the like are solved. According to the technical key points, an isogeometric transient dynamics finite element analysis model of the functional gradient plate structure is constructed based on a reduced Gaussian integral method; constructing a smooth projection scheme and a material interpolation scheme of design variables of the functional gradient plate structure, and providing a transient dynamic topological optimization model of the functional gradient plate structure by taking the density of a control point and the volume fraction of a strong material attached to a plate unit as the design variables and the minimization of dynamic flexibility as a target; constructing a time domain adjoint equation of the topological optimization model, and obtaining sensitivity information of the target function; and finally, obtaining the optimal anti-vibration design of the functional gradient plate structure convenient for engineering application. The device is used for structural light-weight vibration reduction design of large engineering equipment under the strong vibration working condition.

The invention provides a concrete adiabatic temperature rise parameter iterative fitting method based on a segmentation model. The method comprises the steps of constructing a concrete adiabatic temperature rise segmentation fitting formula, determining an initial parameter value range, performing first parameter fitting calculation and performing convergence judgment. According to the method, an existing single curve fitting mode is abandoned, a straight line + double-index curve segmentation model is constructed based on cement hydration five-stage characteristics, a straight line is matched with an initial hydrolysis stage and an induction stage, a double-index curve is matched with subsequent three stages, and it is ensured that a fitting result is consistent with an actual heating process on the aspect of architecture; the problem that a traditional method is large in fitting deviation is effectively solved, the concrete adiabatic temperature rise fitting precision and calculation efficiency are remarkably improved, and the high-precision requirement of large projects for concrete temperature control design is met.

The invention discloses a treatment method and device for construction waste of sea-crossing bridge construction, and belongs to the technical field of construction waste recycling, the device comprises a concrete recycling module, a magnetic collecting tank, a cyclone separator, a water filtering tank, a water tank and other assemblies, and classified recycling and treatment of reinforcing steel bars, gravel, sand, cement paste and waste water are achieved through the multi-stage separation technology. The treatment method comprises the steps that after the construction waste is crushed, steel bars are separated through the magnetic collecting tank; the remaining concrete material enters a rotating second cavity, and graded separation of gravel, sand and cement paste is achieved through gradient rotating speed and inclined spraying; and finally, solid-liquid separation is completed through a cyclone separator, and the wastewater is recycled or discharged after reaching the standard after being treated. The method realizes efficient resource utilization of the construction waste, has the characteristics of modularization, low cost, environmental protection and the like, and is suitable for green construction of large-scale projects such as sea-crossing bridges and the like.

The invention discloses a tempering-free rare earth wear-resistant steel hot rolling method, which optimizes the matching of rough rolling and finish rolling technologies, realizes tempering-free heat treatment, avoids the use of a quenching and tempering heat treatment production process method disclosed in the prior art, effectively avoids low-temperature tempering brittleness, simplifies and shortens the process flow, reduces the production cost, and improves the production efficiency. The product has already been applied to large-abrasion parts of mining machinery, coal mining machinery, environmental protection machinery, conveying machinery and the like and key parts of heavy and heavy engineering with complex use working conditions.

The utility model discloses a spherical hinge structure convenient to disassemble and assemble. The spherical hinge structure comprises a ball head base fixedly arranged on a concrete foundation; the ball head is fixedly arranged on the ball head base; the supporting cylinder is arranged above the ball head base and used for being connected with a tide gate or a bridge or other structures; and the ball head bearing is mounted in the supporting cylinder through a bearing gland and is in running fit with the ball head, so that the ball head bearing, the bearing gland and the supporting cylinder integrally rotate horizontally and / or vertically around the ball head. The utility model is simple and convenient to disassemble and assemble, has the advantages of convenience in maintenance, high bearing capacity, low maintenance cost, strong practicability and the like, and can be applied to various large-scale engineering structures, such as bridge supports, tide gates and the like.

The invention discloses a multipurpose tower crane and a use method thereof, and the multipurpose tower crane is characterized in that a concrete conveying pipeline, a quick joint, a rotary conveying pump and a hose suspension system are integrated, so that the integration of vertical transportation and concrete conveying functions is realized; a conveying pipe, a cargo boom steel cable hanging hose and an electromagnetic device are arranged in the tower body standard section, and hose management is simplified; the device obviously reduces the construction cost, improves the concrete conveying efficiency of the super high-rise building, and is suitable for intensive construction of large engineering projects; compared with the prior art, the tower crane has the following advantages: 1, function integration: the tower crane has vertical transportation and concrete conveying functions, and the equipment utilization rate is increased by more than 50%; 2, the cost is saved: the rental expense of a concrete delivery pump truck is saved, and the comprehensive construction cost is reduced by 30%; efficient conveying is achieved, the concrete conveying height can reach 500 m, and the requirement of a super high-rise building is met; operation is convenient, the pipeline installation efficiency is improved by 70% through the design of a quick connector, and hose management is simplified through an electromagnetic adsorption device.

The scheme relates to the technical field of stress monitoring, in particular to a structure tension bolt stress monitoring system and method, through image acquisition, mechanical sensing, vibration monitoring and other multi-source data fusion, key parameters such as earthwork cracks, bolt stress and equipment vibration are comprehensively analyzed, single index misjudgment is avoided, and earthwork viscosity, crack analysis and vibration influence are introduced, collapse danger is accurately quantified, compared with traditional manual inspection or single sensor monitoring, hidden risks can be found earlier, the warning accuracy is significantly improved, the false alarm rate is reduced, based on the quantification grading of collapse danger value, intelligent matching of differentiated reinforcement measures, this dynamic strategy avoids resource waste caused by excessive reinforcement, and ensures that key risk points are quickly disposed, safety and economy are considered, and is suitable for multi-point cooperative management of large-scale engineering.

1. Name of the product in this design: Switch. 2. Application of this design: for network communication of large-scale engineering machinery. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the key design points: Design 1 3D view. 5. Other situations requiring explanation: Design 1 is designated as the basic design in this design patent.

The application discloses a hydraulic system and method based on large engineering machinery escalator lifting control, and belongs to the technical field of engineering machinery equipment. An oil cylinder is hinged between the escalator and a working platform; a first power unit and a second power unit are connected to a first electromagnetic reversing valve; the first electromagnetic reversing valve is connected to a second electromagnetic reversing valve and a third check valve; one oil outlet of the second electromagnetic reversing valve is connected to a small cavity of the oil cylinder, and the other oil outlet is connected to the small cavity of the oil cylinder through a throttle valve; the third check valve is connected to a large cavity of the oil cylinder, and the third check valve is connected in parallel with a load holding valve; and a pilot control port of the load holding valve is connected to the small cavity of the oil cylinder. The hydraulic system can realize the control of the escalator without starting the host machine; the hydraulic system has relatively high power density, can reduce the space occupancy rate, and is convenient for arrangement, maintenance and installation; the hydraulic system is independent of the hydraulic system of the host machine, does not affect the flow demand of other system functions, and has excellent scalability.

The invention discloses a damper intelligent sensing node and a real-time safety early warning system and method. In a modern large-scale engineering structure, the damper plays a key role of ensuring the safety and stability of the structure. The device comprises a sensor arranged on a damper body; the intelligent sensing node module is used for sensor data acquisition and primary processing; the edge calculation unit module comprises a damper performance evaluation algorithm module, a structure safety state evaluation algorithm module and a fault diagnosis algorithm module; the damper performance evaluation algorithm module adopts a Bi-LSTM network to realize evaluation of energy consumption performance and stability of the damper; the structure safety state evaluation algorithm module adopts a mixed information fusion model combining a D-S evidence theory and fuzzy comprehensive evaluation to realize the evaluation of the structure safety state; and the fault diagnosis algorithm module adopts a convolutional neural network to construct a fault diagnosis model. According to the invention, the timeliness and accuracy of early warning are improved, and reliable guarantee is provided for safe operation of an engineering structure.

The embodiment of the invention discloses a construction engineering drawing jump link automatic generation method and device, equipment and a medium, and relates to the technical field of jump link generation. The method comprises the following steps: receiving a drawing file, and identifying a jump source and a jump target from the drawing file; generating a jump source object based on the jump source and generating a jump target object based on the jump target; determining a target jump target object matched with the jump source object from all the jump target objects; and establishing a jump link between the jump source object and the target jump target object. Through an integrated process of automatic identification, object structured construction, intelligent matching and automatic link establishment, the core problems of low efficiency, insufficient accuracy and difficult maintenance in the prior art are systematically solved, and an efficient, accurate and sustainable maintenance drawing associated navigation technical support is provided for a large-scale engineering project.

The invention relates to the technical field of stress monitoring, in particular to a building split bolt stress monitoring system and method, which comprehensively analyzes key parameters such as earthwork cracks, bolt stress and equipment vibration through multi-source data fusion such as image acquisition, mechanical sensing and vibration monitoring, avoids misjudgment of a single index, and improves the accuracy of monitoring. Meanwhile, earthwork viscosity, crack analysis and vibration influence are introduced, the collapse danger is accurately quantified, compared with traditional manual inspection or single sensor monitoring, the method can find hidden risks earlier, the early warning accuracy is remarkably improved, the false alarm rate is reduced, differential reinforcement measures are intelligently matched on the basis of quantitative grading of collapse danger values, and the safety of the collapse is improved. According to the dynamic strategy, resource waste caused by excessive reinforcement is avoided, key risk points are ensured to be quickly disposed, safety and economy are both considered, and the method is suitable for multi-point collaborative management of large-scale projects.

The utility model discloses a composite reamer bit, and relates to the technical field of drill bits. The composite reamer bit comprises a bit body, a splicing mechanism is mounted at the top end of the bit body, and a sleeving bit is movably clamped to the outer side of the splicing mechanism; by arranging the splicing mechanism, a drill bit body and a sleeving drill bit can be promoted to be attached through a connecting pile, then a built-in motor in a splicing rod is matched to promote a threaded ring to drive a hinge rod to drive a splicing pin to move transversely through a double-section screw, and the sleeving drill bit and the drill bit body are connected; according to the reamer bit, the drilling diameter of the reamer bit can be effectively increased, the drill bit can adapt to more kinds of drilling requirements through the adjustment, and therefore the universality of the reamer bit is remarkably improved, and the application range of the reamer bit is remarkably widened. The drill bit can provide more flexible and efficient solutions regardless of the requirements of small precision operation or large engineering projects.

The invention discloses a construction progress dynamic simulation and correction system based on digital twinning, and relates to the technical field of building construction management, the system specifically comprises a physical layer, a data layer, a model layer, an application layer, an operation monitoring center and a message center, data interaction is realized between the physical layer and the data layer, data interaction is realized between the data layer and the model layer, and data interaction is realized between the application layer and the operation monitoring center. The model layer and the data layer realize data interaction with the application layer, the application layer and the physical layer realize data interaction, and the operation monitoring center and the message center respectively realize data interaction with the physical layer, the data layer, the model layer and the application layer. According to the invention, through integration of unmanned aerial vehicle modeling, a BIM cooperation platform and 4D construction software, automatic comparison, progress deviation analysis and resource dynamic scheduling of construction site live-action data and a plan model are realized, so that a non-technical construction team can rapidly implement high-precision digital twinborn management, and the real-time performance and decision-making efficiency of large-scale project progress control are improved.

The application discloses a nonlinear structural damping calculation method based on a generalized Van der Pol oscillator model, and comprises the following steps: firstly, a segment model free vibration wind tunnel test under static wind condition is carried out, and a torsional displacement response time history of the segment model is collected; secondly, a test amplitude of each vibration period is picked up from the displacement response time history, and an instantaneous structural damping corresponding to each test amplitude is calculated; finally, a relationship between a nonlinear structural damping ratio and a time history is fitted by using the instantaneous structural damping and the corresponding test amplitude, and an expression of the nonlinear structural damping ratio is obtained. The significant effect of the application is that the nonlinear structural damping can be quickly and accurately calculated through the structural free vibration decay response time history, so as to provide a reliable basis for vibration response calculation and design work of large engineering structures.

The application relates to a kind of transient load under the function gradient porous structure of multiphase filling dynamics topology optimization method and system, belong to the topology optimization design field of function gradient porous structure.The technical problems to be solved by the application are: how to fully exploit design space, construct the efficient function gradient porous structure of multiphase filling dynamics topology optimization method, realize the optimal anti-vibration design of porous filling structure with high-quality transient dynamic performance.Technical points: based on characteristic orthogonal decomposition method, the reduced transient dynamic finite element equation of function gradient porous multiphase filling structure is constructed;the material interpolation model and volume constraint model of function gradient porous multiphase filling structure are constructed, and the transient dynamic multiphase filling topology optimization reduced model with the minimum dynamic compliance as the optimization objective is proposed;the reduced sensitivity time-domain accompanying equation is constructed, and the sensitivity of dynamic compliance and volume constraint is efficiently calculated;based on ADMM-MMA hybrid optimization algorithm, the optimal topology design of function gradient porous multiphase filling structure is efficiently solved and obtained.The application can maximize the optimal anti-vibration performance of function gradient porous filling structure, and is especially suitable for the structure lightweight anti-vibration design of large engineering equipment.

According to the modular booster and the welding gun thereof, the booster is installed at the tail of a welding gun handle or connected between welding cables in series, the limitation of the national standard on the length of a wire pushing welding gun is broken through, and the traditional wire feeding distance of 3 meters is expanded to 30 meters or above. The booster breaks through the limitation of the movement range of manual welding, so that an operator is not limited by a limited space any more during large-scale engineering or complex station operation, and the difficulties and pain points of frequent equipment moving, posture adjustment and the like caused by insufficient wire feeding distance on site are solved. Meanwhile, due to an accurate wire feeding control structure and a stable power transmission system, the wire feeding stability can be remarkably improved, welding wire jamming and speed fluctuation are reduced, the welding seam quality is improved, the welding production efficiency is improved, and the automatic wire feeding device is an important innovation in the field of manual welding in equipment performance and operation mode.

The present application relates to the field of engineering vehicles, in particular to a method for compiling a load spectrum of a shovel working device fatigue life bench test procedure, comprising: collecting load signals of key parts of a shovel in the field, and preprocessing the load signals; performing a fatigue test on the shovel, obtaining input loads and output loads of each measuring point, and constructing a training set; establishing a shovel load spectrum prediction model, which is based on an NARX model; identifying the training set through a FROLS algorithm, and training the shovel load spectrum prediction model using the identified training set; performing inverse virtual iteration using the preprocessed load signals to obtain a field input load spectrum; performing rainflow statistical counting on the field input load spectrum to obtain a two-dimensional load spectrum; and converting the two-dimensional load spectrum into a one-dimensional load spectrum based on the equivalent damage principle and the variable amplitude method. The present application realizes fast backstepping and spectrum compiling of a large engineering machinery overall working device fatigue test loading spectrum, and significantly improves efficiency and precision.

The present application relates to a kind of low crack sensitivity coefficient 550MPa grade low alloy high-strength steel plate and its manufacturing method, belong to metallurgical technical field.The chemical composition of the steel plate is C:0.05~0.09%, Si:0.10~0.30%, Mn:1.40~1.60%, Nb:0.040%~0.060%, Ti:0.008%~0.018%, Al:0.020~0.040%, B:≤0.0010%, Ca:0.0005~0.0015%, P:≤0.012%, S:≤0.002%, O:≤0.002%, N:≤0.0035%, H:≤0.0001%, the balance is Fe and inevitable impurity element;Carbon equivalent CEV:≤0.37%, Pcm≤0.19%.Production thickness is 50~70mm, microstructure is mainly uniform acicular ferrite and bainite mixed structure.From the angle of element composition design, base material organization, rolling deformation, small water cooling etc., it is guaranteed that the steel plate has high strength, high toughness, excellent cold bending performance and welding cracking resistance, can be widely used in engineering machinery, high-rise building, bridge, ocean platform etc., and the manufacture of large-scale engineering machinery equipment or steel structure that has strict requirements to formability, weldability.

According to the laser cladding-composite casting integrated forming process for the wear-resistant bucket tooth for the super-large excavator bucket and the wear-resistant bucket tooth, laser cladding and casting technologies are adopted for collaborative manufacturing, and laser power is adopted for cladding iron-based alloy powder containing molybdenum boride / vanadium carbide / titanium nitride composite ceramic particles layer by layer, so that a surface micro-texture wear-resistant layer is formed. A dovetail groove array is innovatively designed on the back face of the base plate, a gradient preheating process is matched, an aluminum oxide hollow ball thermal buffer medium is added in a resin sand casting mold, and interface metallurgical bonding is achieved through molten steel pouring. And the interface oxygen content is smaller than or equal to 0.01 wt% by adopting rare earth scaling powder, quenching-tempering heat treatment is combined, and finally the wear-resistant bucket tooth with the tooth top surface hardness being 1400-1800 HV, the matrix hardness being 300-400 HV and the interface bonding strength being larger than or equal to 500 MPa is prepared. The technology effectively solves the technical problems that a traditional bucket tooth is insufficient in wear resistance and an interface is easy to strip through cladding layer superhard ceramic phase strengthening and casting matrix toughness optimization, and is suitable for manufacturing wear-resistant parts of large engineering machinery.

The utility model discloses a quick lime spreader which comprises a hopper, a material guiding pipe is arranged at the bottom of the hopper, the top side of one end of the material guiding pipe is communicated with the bottom of the hopper, a discharging pipe is arranged on the bottom side of the other end of the material guiding pipe, the material guiding pipe is horizontal, the direction of the discharging pipe is vertically downward, and one end of a transmission shaft is connected with a right-angle steering gear. And a spiral auger is arranged on the inner end surface of the transmission shaft located in the material guide pipe. The device is simple in structure and convenient to use, can be fixedly matched with a tractor for use, can reduce the purchase cost, is relatively small and suitable for being used in an airport compared with large-scale engineering spreading equipment, can be accurately put at a fixed point, and is more convenient to use compared with the conventional manual spade spreading and mechanical equipment for spraying through rotation of a screw rod. The spreading amount in unit time is more than 5 times that of manual work, the fed quicklime powder is uniform and good in continuity, the rotating speed can be adjusted according to different working environments, and the instant spraying amount of the quicklime is optimized.

The invention relates to the technical field of AI collaborative drawing auditing scheme design, in particular to an AI collaborative drawing auditing method, system and platform. The defects of low efficiency, poor collaboration and slow knowledge updating of traditional manual drawing auditing are overcome. The core technology comprises the following steps: automatically identifying drawing specification conflicts through a convolutional neural network; a multi-level rule base is adopted to fuse static specifications and dynamic ship supervision experience; distributing a drawing auditing task based on the adaptation degree model; a detachable structured report is generated and distributed directionally; realizing data security management and control in combination with the permission matrix and the version evolution model; and multi-language real-time switching is supported by using an attention mechanism. A closed-loop control system of AI preliminary screening-manual verification-knowledge feedback is formed, the drawing checking period is remarkably shortened, the design defect recognition rate is increased, and intelligent checking of large engineering projects is supported.

The invention discloses a sealing system and sealing method for a large long thin-wall hydraulic cylinder of ultra-large engineering machinery, the system comprises a piston sealing structure and a guide sleeve sealing structure, and the piston sealing structure comprises a first guide sealing unit, a second guide sealing unit and a combined sealing unit which are arranged in the axial direction of a piston; the first guiding sealing unit, the second guiding sealing unit and the combined sealing unit are in sliding connection with the cylinder barrel. The guide sleeve sealing structure comprises a first guide sleeve and a second guide sleeve, one end of the first guide sleeve is embedded between the cylinder barrel and the piston rod, the other end of the first guide sleeve abuts against the second guide sleeve, the outer surface of the first guide sleeve is in sealing connection with the inner surface of the sheath, and the inner surface of the first guide sleeve is in sliding connection with the piston rod. The problems of internal leakage, oil leakage, shaking abnormal sound, cylinder barrel strain, piston rod strain and the like of a large long thin-wall cylinder of the ultra-large engineering machinery are solved, the reliability of a telescopic system of the ultra-large engineering machinery such as a kiloton crane and the like is improved, the light weight level of the whole machine is realized, and the hoisting capacity and the loading efficiency are improved.