710 results about "Rigid frame" patented technology

The invention discloses a continuous rigid frame bridge construction monitoring method which comprises the following steps: before cantilever casting construction, arranging linear monitoring points along the longitudinal axis direction of a bridge according to the spacing of 8-12 meters, and respectively arranging stress monitoring points on a top plate and a bottom plate of the root section of each section; synchronously acquiring three-dimensional coordinate data of the linear monitoring points and real-time strain data of the stress monitoring points in the process of pouring each section in a cantilever manner; the collected linear data and stress data are input into a finite element model for collaborative analysis, and when a linear deviation value exceeds + / -5% of a designed pre-camber value and the deviation between a stress measured value and a theoretical calculation value exceeds + / -8%, an adjustment instruction is automatically generated; according to the adjusting instruction, the elevation of the front fulcrum of the hanging basket is adjusted through the hydraulic jack during construction of the next section; after initial setting of the adjusted segment concrete, linear data and stress data are collected, and the actually measured data and a finite element model prediction value are compared and verified. The method can help to guarantee the safety and durability of the continuous rigid frame bridge.

The invention discloses a large-span continuous rigid frame construction line shape intelligent monitoring method, and relates to the technical field of large-span continuous rigid frame construction, and the method comprises the following steps: S1, data collection; s2, data processing; s3, performing multi-stage intelligent early warning; s4, construction regulation and control; and S5, outputting a result. According to the method, multi-source equipment is used for synchronously collecting data, the real-time performance and integrity of the data are guaranteed, deep learning is used for eliminating anomalies, a neural network is used for constructing an environment influence model and correcting the data, the influence of environment factors on linear data is corrected, digital twinning is combined with a finite element and a neural network to predict a deformation trend, and the prediction precision is improved. A linear deviation trend is pre-judged in advance, a construction scheme is optimized, multi-level intelligent early warning dynamically adjusts a threshold value according to multiple factors, early warning information is accurately issued, risk response timeliness is enhanced, decision suggestions can be automatically generated through construction regulation and control, an evaluation effect is fed back, and the construction process is optimized.

Insulated panels having suitable surface members separated by an inner layer of insulated foam are used for the walls and as structural members for the floor and roof of a building structure. A rigid frame supports the wall, floor and roof insulated panels. The wall insulated panels are supported on the exterior of the frame by rigid brackets with the insulated panels being suitably flashed or capped.

The invention relates to an intelligent continuous rigid frame bridge construction period deformation prediction system. The system comprises a construction data acquisition module, a data primary processing module, a feature extraction model construction module, a mode special model construction module and a deformation prediction module. According to the invention, original data is obtained through data acquisition; a data primary processing method of data standardization, weighted time sequence alignment, effect decoupling and data set segmentation is adopted; a multi-branch deep learning model is adopted as a feature extraction model, the time dynamics, the spatial topological relation and the physical mechanics priori of bridge structure response are integrated, and the completeness and the discrimination ability of feature expression are remarkably improved; a progressive strategy of firstly extracting and clustering features and then grouping and independently modeling is adopted, so that not only is the specificity of different construction stages fully considered, but also the prediction precision is improved through targeted model optimization, and the problem of mode diversity in a complex construction system is solved.

The invention provides a modular and multifunctional karst collapse physical simulation experiment platform. Comprising a rigid frame, a bearing device, a moving device, a loading device, a lifting device, a pile foundation construction dynamic load simulation device, a ground traveling dynamic load simulation device, a rainfall simulation device, a computer vision monitoring device, an underground water pumping and draining simulation device and an underground space excavation disturbance simulation device. The moving device is arranged on the bearing device, the lifting device, the loading device and the pile foundation construction dynamic load simulation device are arranged on the moving device, the travelling crane dynamic load simulation device is connected with a traction device of the moving trolley, and the camera shooting monitoring device and the rainfall simulation device are arranged on the rigid frame through a support. According to the method, key disaster-causing conditions in the urban environment are fully considered, the working condition scene coverage is wide, and the applicability is high; modularized design is adopted as a whole, all the modules can be flexibly loaded according to requirements, the real environment can be simulated more truly, and the catastrophe evolution process of surface collapse can be reproduced.

The invention relates to the technical field of bridge construction, in particular to a multi-span continuous rigid frame bridge closure jacking force optimization method and system.The method comprises the steps that firstly, construction steps corresponding to a closure sequence scheme are determined according to the closure sequence scheme; secondly, performing soil constraint degradation simulation according to a closure sequence scheme and the corresponding construction steps, and establishing a finite element model of a full bridge; then, parameters corresponding to the unit jacking force applied to each closure gap and parameters corresponding to the unit jacking force not applied to each closure gap are calculated based on the finite element model, and a to-be-solved function is constructed based on the first parameters and the second parameters; finally, a fuzzy mathematical solution is adopted, the multi-target optimization problem corresponding to the to-be-solved function is converted into a single-target linear programming problem, and the optimal solution of the jacking force is obtained.According to the scheme, the soil constraint degradation effect is comprehensively simulated, meanwhile, the multi-target problem in the deepwater environment is converted into the single-target linear programming problem, and the optimal solution of the jacking force is obtained. The solving process is simplified, and the optimal solution of the jacking force can be accurately solved.

An exercise apparatus supports plank and core-strength movements by engaging a user's upper limbs and supporting the user above a ground surface. A rigid frame carries at least one upper-limb support pad arranged to support a portion of the upper limb; a hand grip can be grasped while the limb rests on the pad. The pad and grip can be repositioned, re-oriented, or spaced to suit different body sizes, exercise variants, or load angles. A ground-engaging surface permits placement for use on indoor floors, mats, or outdoor terrain.

The invention discloses a continuous rigid frame aqueduct cantilever casting hanging basket stress monitoring and early warning method and system, and relates to the technical field of hydraulic engineering construction.The method comprises the steps that stress monitoring points and displacement monitoring points are arranged, and a stress-displacement double-system collaborative sensing model is constructed; carrying out double-channel vibration noise separation on the stress signal and the displacement signal which are collected in real time; respectively calculating wet weight values based on a stress-wet weight nonlinear mapping relation and a displacement-wet weight geometric inversion model, and verifying the consistency of wet weight value measurement results through a residual checking mechanism; constructing a multi-source driving safety threshold model, and generating a dynamic safety threshold in real time; and when the monitored wet weight value exceeds the dynamic safety threshold value, triggering graded early warning and executing risk control measures. According to the stress-displacement dual-system independent measurement and cross checking method, through a vibration frequency domain compensation algorithm, vibration interference is suppressed, a multi-source driving safety threshold model is constructed, and high-precision monitoring of the stress of a continuous rigid frame aqueduct cantilever casting hanging basket is achieved.

The invention discloses an integral dismantling method for a rigid frame bridge hanging basket formwork, and relates to the technical field of bridge engineering construction. The problems that in the prior art, the rigid frame bridge hanging basket formwork dismantling efficiency is low, potential safety hazards are high, and cost is high are solved. The dismantling method comprises the following steps of: pre-burying a winch anchor bolt to anchor a winch; loosening a hanging basket anchor system to separate a hanging basket bottom die from a concrete box girder; arranging four winches to be matched with fixed pulleys; synchronously lifting the hanging basket bottom die for static load test, then synchronously lowering the hanging basket bottom die to the ground, and decomposing and dismantling the hanging basket bottom die on the ground. And the hanging basket truss is disassembled on the bridge floor. The integral dismantling method for the hanging basket formwork of the rigid frame bridge is used for dismantling the hanging basket bottom formwork of the rigid frame bridge, an integral dismantling mode is adopted, high-altitude split operation of the hanging basket bottom formwork is converted into integral ground dismantling, the operation time is shortened, and the dismantling efficiency is improved; the template loss is reduced, and the cost is reduced; aloft work is reduced, and potential safety hazards are reduced. The method is particularly suitable for large-span bridge engineering crossing rivers and seas or expressways.

The invention discloses an aquaculture net cage of an offshore wind power foundation, a working method of the aquaculture net cage and an offshore wind power jacket, and belongs to the technical field of offshore wind power jacket foundations.The aquaculture net cage comprises a netting forming an aquaculture cavity, the top of the netting is open and connected with a working platform, and the bottom of the netting is connected with a rigid frame; the working platform is connected with the rigid frame through a plurality of frame lifting steel ropes, the netting is provided with a plurality of tensioning assemblies, each tensioning assembly comprises a netting tensioning rope and a pulley, after the netting tensioning rope movably penetrates through the pulley, one end of the netting tensioning rope is connected to the rigid frame, the other end of the netting tensioning rope is connected to the working platform, and the netting tensioning rope is provided with a dismounting part. Spatial reuse with an offshore wind power jacket can be realized, the culture net is convenient to fold and unfold, the structure is relatively stable after installation and adapts to different offshore weathers, and the maintenance cost is reduced through the structural design of flexible lifting and flexible disassembly. The offshore wind power jacket auxiliary facility with environmental adaptability and maintenance convenience is formed.

The invention relates to a planetary double-spoke cutterhead device for soft soil stratums, which comprises a rigid cutterhead frame, and the rigid cutterhead frame comprises two main spokes which are oppositely arranged in the radial direction and an auxiliary spoke which is arranged between the two main spokes; the main spokes and the auxiliary spokes are fixedly connected to the driving connecting base. The main spokes and the auxiliary spokes are fixedly connected to the driving connecting base. The scraping cutters are fixedly mounted on the main spokes and the auxiliary spokes; the output end of the planetary transmission mechanism is connected with the driving connecting seat, and the planetary transmission mechanism is configured to drive the driving connecting seat and drive the rigid cutter head frame to execute a compound planetary motion; the simple rigid frame is adopted to fix the scraping cutter, so that the structure of the cutter head is extremely simple, the extremely high aperture ratio is obtained, and the technical problem that mud cakes are easily formed on the cutter head in a soft soil stratum is effectively solved; and meanwhile, the framework is driven to perform specific planetary motion, so that the full-section excavation of the triangular section is successfully realized, and the high aperture ratio and the special-shaped section forming capability are integrated.

The invention relates to a device (1) for handling a drum and for unwinding a material wound onto the drum, wherein the handling device (1) comprises a rigid frame (2) comprising two side members (3) held at a distance from each other, and in which: - each side member (3) supports a wheel (4); - each wheel (4) is mounted, independently of the other wheel (4), so as to be free to rotate relative to the frame (2) about an axis (11) of rotation common to both wheels (4) and orthogonal to the side members (3); - each side member (3) is provided with a suspension member (5) arranged so as to be able to be fitted into an axial opening of the drum, wherein the suspension members (5) are suitable for being able to hold the drum at a distance from the ground so as to allow the drum to rotate on itself according to the axis of symmetry of the drum and to unwind the material wound onto the drum.

The invention relates to the technical field of highway bridge demolition, in particular to a mechanical demolition construction method for a slant leg rigid frame bridge. Through the means of combining on-site actual measurement and numerical simulation analysis, a non-linear refined bridge demolition model is adopted, and the whole construction process of bridge mechanical demolition is reasonably simulated. And performing whole-process finite element analysis and comparison on the to-be-broken bridge to accurately obtain the collapse state of the bridge and the deflection limit value of the collapse of the bridge. Bridge breaking is carried out according to the optimal breaking sequence, and risk early warning can be effectively carried out. According to the technical scheme, on the basis of the scheme, real-time monitoring is further carried out in the whole forcible entry process through a strain sensor and long-distance deflection measuring equipment. And the construction risk of mechanical forcible entry is further reduced.

The lightweight columbarium comprises a rigid frame made of a frame material, a number of decorative panels made of a decorative panel material, panel attachments for attaching the decorative panels to the rigid frame, and an enclosure defined within said decorative panels and said frame, for receiving a funeral urn. The frame material is less fragile than the decorative panel material and allows the frame to provide structural rigidity to the columbarium at less weight than if only the decorative panel material were used. The columbarium may be transported on a ritual transporter comprising a columbarium bed for carrying the columbarium and handles attached to the columbarium bed for transporting the transporter. The columbarium may be stored in a crate comprising a rigid protective shell attached to the columbarium externally thereof for protecting the columbarium against impacts; and an opening provided in the protective shell that is aligned with the bottom of the columbarium. The columbarium may be removed from the crate and installed on a base using a prop sized to fit within a shell opening in the crate so as to abut against the bottom of the columbarium and to protrude beyond the shell, for allowing the columbarium to rest on prop when the prop rests on the ground for facilitating egress of the columbarium from the crate and installation of the columbarium on the base.

A personal mobility assistance device includes a frame that includes a first ridged component moveable relative to a second ridged component by a linkage mechanism. The first rigid frame component has a first light emitter mounted in a first opening in the first rigid frame component and the second rigid frame component has a second light emitter mounted in a second opening in the second rigid frame component. The first light emitter is connected to a first component conductor portion of a conductor within the first rigid component and the second light emitter connected to a second component conductor portion of the conductor within the second rigid component. A conductor connection mechanism within the linkage mechanism includes a plurality of contacts that electrically connect the second component conductor portion to the first conductor portion when the linkage mechanism is in at least one position.

The invention relates to the technical field of mold machining, in particular to a numerical control drilling machine for mold assembly machining. Comprising a base and a supporting seat installed on the base. A drilling mechanism is arranged on the supporting seat; the double twist drills are driven by the driving part to achieve synchronous back-to-back drilling in a rigid frame formed by the fixed seat and the sliding seat, the efficiency bottleneck of single-spindle sequential operation is broken through in a parallel machining mode, and machining vibration is effectively restrained by forming a force closed loop through generated reverse cutting force; meanwhile, the chip removing part is used for removing chips through extrusion supporting and moving of the push rod in the U-shaped chip groove of the twist drill, directional spraying of the spraying pipe is matched, automatic removing, cooling and lubricating of the chips are achieved, and therefore the technical problems of low efficiency, vibration deflection and chip winding existing in circular mold drilling are solved cooperatively on the whole.

The application belongs to the technical field of bridge intelligent construction, and specifically discloses a high-pier large-span continuous rigid-frame bridge pier settlement displacement monitoring method and system, which comprises the following steps: collecting image sequences at a main target of a pier and at a reference point sub-target under a main girder construction condition; processing the images, including low-illumination image enhancement and high-precision segmentation of optical marker points under a complex background; identifying the optical marker point center coordinates at the main target and the sub-target based on an adaptive threshold gradient Hough transform (ATGHT), extracting the displacement values at the main target of the pier and the reference point sub-target, and then compensating for the camera self-motion measurement error, so as to obtain the pier settlement value of the main girder in the cantilever construction process. The application utilizes a non-contact device to monitor the pier settlement displacement in the main girder construction stage, realizes non-contact, multi-measurement-point, high-precision and high-efficiency monitoring of the pier settlement displacement of the super-high-pier large-span continuous rigid-frame bridge under a complex background, and has the advantages of low cost, convenient use and flexible measurement point selection.

The invention discloses a method for testing compression performance through a testing machine, which comprises the following specific steps: placing a sample on the upper end surface of a compression main body, and enabling two end surfaces of the sample to be parallel; after the extensometer is fixed, the testing machine is reset, and the extensometer is reset; starting the testing machine for compression, synchronously acquiring sample load data and average deformation data on two sides by the extensometer, transmitting the data into the testing machine, generating a stress-strain curve by the testing machine, and reading the compression yield strength, the compression elastic modulus and the compression strength from the curve. The extensometers on the two sides are directly hung between the upper cover and the compression main body to form a closed symmetrical measurement chain, so that knife edges on the two sides are located in the same rigid frame, bending deformation is offset, the reading difference is reduced to one tenth of the original value, meanwhile, a load line and a measurement line coincide, a secondary force transmission path is avoided, and the measurement accuracy is improved. And the flexibility of the rack only affects the overall displacement without changing the relative deformation in the gauge length of the extensometer, so that the repeatability of the elastic modulus is remarkably improved.

A portable stand includes a rigid frame portion, an actuator portion synchronously coupled to a transfer shaft, a plurality of rotatable leg assemblies, a plurality of transfer shaft pulleys corresponding to the respective leg assemblies, and a plurality of leg flexible connectors synchronously coupling the respective leg assemblies to the transfer shaft through the transfer shaft pulleys. A portable stand may include a linear actuator coupled to a transfer shaft by a leg pull cam, and the transfer shaft synchronously coupled to a plurality of rotatable leg assemblies by a plurality of corresponding transfer shaft pulleys acting on corresponding flexible leg connectors.

Insulated panels having suitable surface members separated by an inner layer of insulated foam are used for the walls and as structural members for the floor and roof of a building structure. A rigid frame supports the wall, floor and roof insulated panels. The wall insulated panels are supported on the exterior of the frame by rigid brackets with the insulated panels being suitably flashed or capped.

Some embodiments of the disclosure disclose a tuned damping method for seismic isolation of pile foundations in a deep-water long-span continuous rigid frame bridge, which relates to the technical field of shock absorption for bridge engineering structures. It solves the problem that the “pile foundation seismic isolation” of deep-water long-span continuous rigid frame bridges lacks a theoretical quantitative calculation method, making it impossible to fully exert the effect of “pile foundation isolation”. The present disclosure includes: simplifying a deep-water long-span continuous rigid frame bridge model into a 2-degree-of-freedom dynamical model; setting an optimization objective function based on the 2-degree-of-freedom dynamical model; performing parameter optimization based on the optimization objective function; and determining structural seismic parameters of the deep-water long-span continuous rigid frame bridge based on parameters optimized in step 3.

The invention provides a long-term deformation prediction method and system for a large-span rigid frame bridge, and relates to the technical field of bridge deformation prediction. The method aims at solving the problems that in the prior art, a prediction method insufficiently considers the coupling effect of geometric nonlinearity and the concrete shrinkage and creep effect and lacks the dynamic response capacity to damage events in the operation period, and consequently the deviation between a prediction result and the reality is large. According to the method, synchronous coupling analysis of the two effects is realized by establishing a space finite element model and constructing a structure balance equation which simultaneously considers the geometric nonlinearity and the shrinkage and creep effect; through reference simulation and damage event identification based on a probability distribution model, dynamic damage correction and simulation restart are carried out on the model in combination with monitoring data, a closed-loop prediction mechanism for identification, correction and restart is constructed, the precision and accuracy of long-term deformation and internal force prediction are effectively improved, and the adaptability in a complex scene is improved.

The invention relates to the technical field of water conservancy projects, in particular to a design method of a continuous rigid frame aqueduct. Comprising the following steps that the building position of the continuous rigid frame aqueduct is determined, and the aqueduct span arrangement of the continuous rigid frame aqueduct is drawn up according to the building position; hole span arrangement, side span and main span are determined according to a preset side-mid span ratio range of the continuous rigid frame aqueduct; the root beam height and the closure section beam height are determined according to the main span and the preset height-span ratio range of the continuous rigid frame aqueduct; the thickness range of a plate, the length of a pier top cast-in-place section, the length of a closure section and a groove body bottom curvilinear equation are determined, and a suspended casting section is segmented; the center distance of the double-limb thin-wall pier and the center distance of double limbs are determined; arranging prestressed steel beams for the continuous rigid frame aqueduct in the longitudinal direction and the transverse direction respectively; and constructing a finite element model and carrying out finite element analysis. According to the design theory and method of the continuous rigid frame aqueduct, rapid design of the continuous rigid frame aqueduct can be achieved, and a basis can be provided for standard compilation.

The invention discloses a protective film tensile strength automatic detection device and a detection method thereof, and relates to the technical field of film tensile strength detection.The protective film tensile strength automatic detection device comprises a tensile testing machine, the tensile testing machine comprises a rigid rack, a movable cross beam and a bidirectional clamp, and further comprises an air permeability detection mechanism; the air permeability detection mechanism comprises an air blowing assembly and an airflow detection assembly which are symmetrically arranged on the two sides of the membrane material sample and is used for synchronously detecting the air permeability in a stretching state. The problems that in the prior art, a waterproof breathable film meets the requirements for dynamic tensile stress and breathability at the same time in actual application, and due to the fact that traditional independent testing cannot quantify the relation between tensile deformation and breathability, static data overestimate the real performance of a material under the actual working condition, and the risk of structural failure is caused are solved. The device has the advantages that synchronous dynamic detection of the air permeability of the protective film in the stretching process is achieved through integrated design, and the material performance attenuation rule under the actual working condition is quantified.

The invention provides an intelligent construction safety monitoring system and method for a U-shaped stacked box rigid frame aqueduct, and the system is suitable for the U-shaped stacked box rigid frame aqueduct for hanging basket construction, and comprises a sensing layer which is used for collecting the stress state of a hanging basket; the environment monitoring unit is a micro weather station mounted on an upper cross beam of the hanging basket; the posture monitoring unit is used for monitoring the lateral and longitudinal inclination angles of the hanging basket in real time; the execution layer comprises a catenary anti-overturning device arranged behind the rear anchor point of the hanging basket, the catenary anti-overturning device comprises a hinged steel chain, and the hinged steel chain and the foundation anchoring end form a catenary structure; the control layer comprises an edge computing terminal and a threshold library in which early warning thresholds are stored, and the edge computing terminal is used for receiving the data of the sensing layer in real time, performing multi-source data fusion analysis and judging whether an early warning or emergency mechanism is triggered or not according to an analysis result; and the interaction layer comprises a visual platform, and the visual platform is used for carrying out fusion display on the monitoring data and the BIM model and presenting the risk level in a color coding mode.

A ride-on power trowel has first and second engines mounted to a rigid frame. Each of first and second drive loops have a hydraulic pump powered by such an engine and a drive motor powered by the hydraulic pump. Rotor assemblies are coupled to the drive motors and configured to contact a concrete surface beneath the frame. A feedback controller sets rotor speed in each assembly to a power limited speed based on loads sensed in the drive loops. The power limited speed is an estimated maximum rotor speed achievable for the highest sensed load, which may be affected by operating data received from the engine associated with the highest sensed load.

The invention discloses a V-shaped pier continuous rigid frame non-support construction method, belongs to the technical field of bridge construction, and solves the problem of large occupied space of existing V-shaped pier construction. No floor supporting frame is arranged under the bridge, roads and channels under the bridge are not occupied, and vehicle passing or ship navigation under the bridge is not affected by bridge construction; according to the method, a constructed structure serves as a beam body pouring supporting platform, no support is arranged under a bridge, and therefore the temporary pile foundation engineering amount and the support engineering amount are reduced, the manufacturing cost is greatly saved, and economic benefits are remarkable; compared with an existing hanging basket construction method, the hanging basket construction method does not need a supporting frame, the beam body is poured through a hanging basket cantilever, only the bailey beam is needed, and a hanging basket is not needed. Compared with a bailey beam, the hanging basket is customized, the bailey beam only needs to be leased and assembled, the cost is low, meanwhile, the construction of the hanging basket has certain technical difficulty, and the construction of the bailey beam is relatively low in technical difficulty, small in risk and high in safety.

A device for retaining a solid sorbent includes a frame having a first rigid frame portion and a second rigid frame portion, and a non-rigid and porous structure forming one or more walls of a sorbent compartment having a selected shape, the sorbent compartment defining a volume for retaining the loose solid sorbent. The porous structure includes a first end attached to the first rigid frame portion and the porous structure is held in tension, the tension causing the porous structure to retain the selected shape when the loose solid sorbent is held in the sorbent compartment. The porous structure is held in tension by attachment to the first rigid frame portion and attachment to the second rigid frame portion, and / or by attachment to the first rigid portion and a weight of the loose solid sorbent.

A apparatus including: a silicone-based body oriented down a central axis, the silicone-based body comprising: a rigid frame having a top axial surface and a bottom axial surface, an outer surface, and a substantially arcuate inner surface; and a plurality of gas-permeable, flexible film membranes connecting the inner surface about a perimeter of the rigid frame at the top axial surface and the bottom axial surface respectively to define an internal void within the body, wherein the rigid frame has a plurality of corrugations along the top axial surface and the bottom axial surface, and wherein the internal void provides for a medically, biologically, chemically, or pharmaceutically active environment.

The utility model relates to the technical field of vehicle-mounted articles, in particular to a two-section type vehicle-mounted refrigerator rack which comprises a supporting frame, a sliding rail assembly movably connected with the supporting frame and a tray movably connected with the sliding rail assembly and used for carrying a refrigerator, and the supporting frame comprises a back plate and two side plates fixed to the two ends of the back plate respectively. The reinforcing plates are fixed to the two sides of the tray and the inner sides of the side plates, the connecting blocks are movably connected with the reinforcing plates, the reinforcing plates are provided with a plurality of rolling wheels arranged side by side, the front face and the back face of each connecting block are provided with first sliding grooves and second sliding grooves matched with the rolling wheels, and the rolling wheels are embedded into the first sliding grooves and the second sliding grooves to roll. The connecting block is arranged at the connecting position of the tray and the supporting frame, the reinforcing plates with the rollers are arranged on the tray and the side plates, the rollers are movably connected with the connecting block, and a rigid frame structure of the side plates and the back plate is matched, so that the structure is simplified, the production cost is reduced, and the structural rigidity can be improved.