107 results about "Complex topography" patented technology

The invention discloses an intelligent wind power tower outer wall grinding system and method, and relates to the technical field of outer wall grinding. Generating a preset outer wall polishing path, and determining a grinding head pressure-rotating speed matching parameter in combination with the material hardness of the tower drum and a grinding tool loss coefficient; mechanical arm pose data are introduced, and first error compensation data are determined in combination with tower drum outer wall corrosion depth data; determining second error compensation data through a wind power tower outer wall polishing task in combination with a tower outer wall welding seam; and connecting a plurality of mechanical arms in cooperative operation, configuring a master-slave control framework in combination with the first error compensation data and the second error compensation data, and performing outer wall grinding multi-end cooperative control on the target wind power tower drum by using the master-slave control framework. The technical problem that in the prior art, high-precision collaborative grinding of the outer wall of the wind power tower drum under the complex morphology cannot be achieved is solved, and the technical effect of improving the grinding precision and operation consistency of the outer wall of the wind power tower drum is achieved.

The invention relates to a comprehensive construction method for a Larsen steel sheet pile cofferdam of an anti-typhoon cross-sea bridge. The comprehensive construction method comprises the steps that firstly, BIM and VR application is conducted; 2, construction preparation is conducted; thirdly, a first enclosing purlin is installed, and steel sheet piles are driven in an inserted mode; fourthly, steel enclosing purlins and water stops are installed; 5, bottom sealing concrete is constructed; sixthly, the elevator cage is installed; seventhly, a bearing platform is constructed; eighthly, dismantling construction is conducted; ninthly, the steel sheet piles are recycled; and step 10, intelligent monitoring application. The construction challenges caused by complex landforms at the bottom of the foundation are effectively overcome by adopting targeted construction measures, the resistance to typhoon and storm impact is enhanced, corresponding improvement measures are integrated in all construction processes, and positive effects are achieved.

The invention provides a muon and aeromagnetic data fusion three-dimensional imaging method, a medium, equipment and a product, and relates to the technical field of geological exploration, the method comprises the following steps: dividing an object to be measured into a plurality of voxels with the same volume, and calculating the magnetization intensity and density value of each voxel according to aeromagnetic detection data and muon detection data; obtaining a magnetism-density physical parameter model; according to the magnetism-density physical parameter model, aeromagnetic inversion and muon inversion are carried out, and an objective function of aeromagnetic inversion and an objective function of muon inversion are established; establishing a joint constraint term, and combining the target function of aeromagnetic inversion and the target function of muon inversion to construct a target function of joint inversion; and solving the joint inversion target function to obtain an optimal magnetism-density value, and imaging the three-dimensional magnetism-density structure distribution in the geomorphic mineral product. According to the method, the magnetic and density abnormal structures in the complex landform can be determined at the same time, and the precision of the geophysical exploration technology is improved.

According to the hydraulic composite launching device, the launching device is composed of the mechanical structure and the electrical control system, the mechanical structure is the basis for achieving the launching function, and the control system provides powerful support for control over various parameters. And the two are mutually coordinated to realize automation and integration of the launching device. The mechanical structure is composed of a base, a rotary support, a rotary machine, a launching platform and a hydraulic system. The corresponding electrical control system is composed of a horizontal control system, a yaw angle control system, a pitch angle control system and a control and display interface. The hydraulic system provides power for the device, the leveling mechanism is used for achieving horizontal leveling of the device, and the pitching mechanism and the deflection mechanism are used for adjusting the pitching angle and the deflection angle of the launching platform respectively. The hydraulic composite launching device is suitable for complex landforms, posture adjustment before launching can be completed within 10 minutes, and the time needed by preparation work before launching is greatly shortened.

The invention relates to the technical field of photovoltaic power generation, and discloses a self-adaptive terrain adjustable supporting platform which comprises a transverse plate, a bottom plate arranged at the bottom of the transverse plate, a horizontal adjusting mechanism arranged at the top of the bottom plate, a height adjusting mechanism arranged between the bottom plate and the transverse plate, a supporting plate arranged at the top of the transverse plate, and a rotary adjusting mechanism arranged between the supporting plate and the transverse plate. According to the horizontal adjusting mechanism, horizontal calibration can be completed through simple operation on complex terrains such as mountain inclined slopes and potholes, and the stability after adjustment is maintained. The height adjusting mechanism ensures stability and reliability at various heights, and the installation requirements of different scenes such as low roofs and high-altitude open areas are met.

This invention discloses a three-dimensional contour measurement method and apparatus based on multi-projection gratings, relating to the field of three-dimensional topography measurement technology. The method includes: obtaining intrinsic and extrinsic parameters through calibration; projecting a set of speckle patterns; preliminarily analyzing the surface topography gradient of the object to determine a non-uniform spatial frequency sequence; sequentially projecting and acquiring multiple sets of phase-shifting grating patterns, and calculating the wrapping phase map corresponding to each frequency; for the same pixel, based on its reliability assessment in wrapping phase maps at different frequencies, assigning confidence weights to the phase values ​​of each frequency, and calculating and optimizing the phase map and the corresponding fused confidence map; calculating gradient information and combining it with the fused confidence map to perform region division, and executing a region-guided path consistency verification unfolding algorithm to obtain the absolute phase; converting the absolute phase into three-dimensional point cloud coordinates of the object surface. This application aims to solve the problems of complex topography, discontinuities, and noise easily leading to unfolding path errors and order jumps during phase unfolding.

The application relates to the technical field of surveying and mapping, in particular to a self-adaptive marine surveying and mapping path planning and execution system and method. The method comprises the following steps: obtaining to-be-mapped sea area data, analyzing the to-be-mapped sea area data, and determining a to-be-mapped range; determining a surveying and mapping path according to the to-be-mapped range; and performing cruise surveying and mapping according to the surveying and mapping path; in the surveying and mapping process, obtaining travel data, and determining whether a bay exists according to the travel data; if the bay exists, analyzing the travel data, determining an entry point of the bay, and performing bay surveying and mapping planning and execution according to the entry point. The method ensures that surveying and mapping work can be carried out comprehensively and orderly, and reduces repeated work and missed areas. The travel data in the surveying and mapping process is monitored in real time, and the complex topography of the bay is identified in a timely manner. The entry point of the bay is accurately determined, and the bay surveying and mapping can be accurately performed. A special bay surveying and mapping plan is formulated, and a surveying and mapping task is executed, so that topographic data can be recorded in detail and accurately.

The invention belongs to the technical field of synthetic aperture radars, and discloses a high mountain and valley region-oriented SAR corner reflector arrangement method, which realizes accurate positioning and installation angle optimization of an SAR corner reflector by introducing an MDDG model and an R index evaluation index and combining GNSS high-precision positioning and R-D equation iterative optimization, and improves the positioning accuracy of the SAR corner reflector. High spatial precision and long-term stability of InSAR monitoring are ensured; according to the method, after the SAR corner reflector is installed, the installation angle is optimized through RCS time sequence analysis and UAV image; according to the method, the installation stability, the signal reflection quality and the observation precision of the SAR reflector can be improved, the arrangement and positioning of the reflector can be optimized especially under complex terrain and environment conditions, and the problems of signal attenuation, shielding, positioning errors, signal aliasing and the like of the reflector in the prior art are solved.

The application provides a simulation method and system for the interaction between seabed topography and ocean current, comprising: obtaining high-resolution seabed topography data, generating an adaptive grid structure, and constructing fine topography description data; generating interaction data between the ocean current field and the topography by using a turbulence closure model according to the fine topography description data; simulating a nonlinear process to generate nonlinear process characteristic data according to the interaction data; generating ocean mixing process data by using a particle tracking method according to the nonlinear process characteristic data; optimizing turbulence parameters to generate optimized turbulence mixing data according to the ocean mixing process data; and updating the simulation of the ocean current field to generate high-precision ocean current field distribution data according to the optimized turbulence mixing data. The application can improve the simulation accuracy of ocean dynamic processes under complex topography conditions and provide important support for ocean environment prediction and resource development.

The utility model provides a kind of photovoltaic tracking support complex topography adaptive device, it includes: at least two main girder, shell and inner shaft, one end of the shell and the end of one of the main girder is connected;The inner shaft is installed in the shell, relative spherical motion is realized by ball rotation, the end of the inner shaft and the end of another main girder is connected, the inner shaft and the shell are rotatably connected, to drive the relative universal rotation of two adjacent main girders.The utility model can be self-adaptive mountain, hilly and other undulating topography, significantly reduce project cost, while broaden the application scenario of flat single-axis system.The topography adaptive device does not require main shaft axis on a straight line, can reduce the piling accuracy requirement.

The invention discloses a mountainous area channel type waste slag yard upstream water flow comprehensive treatment structural form, an upstream slag blocking dam and a downstream blocking dam are sequentially arranged on the upstream of a waste slag yard in the water flow direction, and a drainage tunnel is arranged between the upstream slag blocking dam and the downstream blocking dam and is close to the downstream blocking dam. The upstream slag blocking dam is of a concrete structure, an overflow groove is reserved in the top of the dam body, and a plurality of holes communicating upstream and downstream are formed in the middle of the dam body. The method is high in engineering applicability, can be directly deployed in the upstream area of the channel type waste slag field in the mountainous area, does not need complex terrain reconstruction, and is particularly suitable for typical mountainous area environments with steep terrains and limited construction conditions. By means of the optimized structural design, efficient interception of floating objects and coarse particle matter can be achieved at the same time; and fine-particle silt is directionally deposited to form a complete protection system. Deposits are convenient to clean, and the maintenance cost is remarkably reduced.

The application discloses a low-efficiency land dynamic monitoring management method based on real three-dimensional geographical entities, relates to the technical field of natural resource informatization management, and comprises the following steps: constructing a terrain mutation sensitivity atlas and a vertical risk guide grid, generating a weighted initial value field under the joint driving of an elevation gradient, a reflection intensity and an echo confidence, and forming vertical prior information of geographical entities; based on the vertical prior information of the geographical entities, performing spatiotemporal consistency forced registration, performing local elastic calibration on oblique photography images and laser point cloud data through a multi-scale rigid-flexible mixed constraint mechanism, and generating a vertical error field. Through the construction of the sensitivity atlas, the execution of rigid-flexible registration, the introduction of semantic reconstruction, the implementation of uncertainty propagation and dynamic resampling regulation and control, the vertical error closed-loop correction of the three-dimensional model under complex topography is realized, the accuracy and stability of low-efficiency land identification are improved, and high-credibility technical support is provided for urban space analysis and land decision-making.

The invention discloses a full-irradiation aviation electromagnetic observation method. The method comprises the following steps: S1, scanning survey line topographic data of a target survey area; s2, dynamically controlling postures of a transmitting coil and a receiving coil based on the survey line topographic data in the S1, and collecting electromagnetic data of a target survey area; and S3, processing the electromagnetic data collected in the step S2, and carrying out random cross gradient constraint inversion to obtain geological structure information of the underground target in the target measurement area. The detection effect of an aviation electromagnetic method in a steep fluctuating environment is remarkably improved for mineral resources, engineering geophysical prospecting and hydrogeological prospecting in a complex terrain area through a full-irradiation aviation electromagnetic observation system in a complex fluctuating terrain and an isotropic resistivity cross constraint inversion method. According to the method, the interference of topographic factors on electromagnetic signals is effectively reduced, and the limitation of insufficient signal coverage in complex topographies in a traditional method is overcome, so that the data processing precision is improved, and richer underground information is obtained.

The utility model discloses a safety protection frame for geological survey, including the blocking net, the blocking net side installs the connecting bolt group, the connecting bolt group is passed through the hole of the ear plate upper opening, and the ear plate is fixed on the outside of vertical rod, the vertical rod bottom fixed mounting has main base plate, the vertical rod front side bottom fixed has the reinforcing rib board, the reinforcing rib board bottom and main base plate top surface connection fixed, main base plate bottom surface is equipped with the bottom hole, and the bottom hole inner wall is connected with main anchor rod top end, the sleeve pipe is installed on the vertical rod, and the hole of sleeve pipe front side is equipped with the lock bolt and is installed in the hole, and the lock bolt is connected with the lock hole. This safety protection frame for geological survey adopts novel structure design, so that the protection frame each part can be quickly assembled and adjust, realizes the quick leveling on the complex topography, and the overall structure is stable, can adapt to the operating surface of different slope and height, and greatly improves the versatility.

The invention belongs to the technical field of nanometer measurement and control, provides a multi-mode cooperative force control method for contact mode scanning of an atomic force microscope, and aims to extract contact state information in real time by carrying out drift and aberration compensation on a measurement signal so as to realize multi-mode cooperative force control. Combined self-adaptive setting of control parameters is carried out in combination with sample morphology characteristics and error signal statistical characteristics, and undisturbed switching between a steady state controller and a transient state controller is realized, so that stable, rapid and low-noise force tracking control is realized in samples with different rigidities and changing noise environments. And the stability and the imaging quality of AFM contact mode scanning are obviously improved. According to the invention, adaptive force control on samples with different rigidities and complex shapes is realized, and the scanning stability and imaging quality of the contact mode atomic force microscope are remarkably improved.

The application discloses a kind of complex tide river network's multi-source compound disaster inundation risk simulation method, contains the construction method of astronomic tide-storm surge-flood-salinity-falling multi-scale dynamic process full coupling model, can analyze complex river network in climate change scenario mountain torrent, storm surge, salinity and rainstorm etc. extreme compound disaster's inundation and salinity upstream risk.Through potential inundation area determination, model grid optimization, numerical format setting and parallel acceleration etc. technical means, on the basis of guaranteeing momentum and material flux conservation in river network, maximum degree optimizes calculation efficiency, can realize in estuary-coastal cross-scale spatial region high-precision simulation of the purpose of giving priority to multi-source disaster inundation and saltwater stratification.Based on the application, the problem that water dynamics, salinity, relatively isolated nearshore complex topography cannot interact in traditional simulation can be solved, technical support is provided for scientific evaluation of estuary area multi-source disaster risk and return period, with outstanding social benefits and disaster prevention and mitigation economic benefits.

This invention discloses a construction method for a suspended pier on a steep mountain slope, comprising the following steps: (1) excavating and leveling a multi-tiered construction platform from top to bottom on the upper part of the steep slope; (2) excavating the lower construction platform step by step according to the actual situation; (3) excavating pile foundations at each tier of the construction platform; (4) extending the steel casing after the pile foundation excavation is completed and pouring pile foundation concrete; (5) installing a bracket structure on the top of the extended steel casing; (6) constructing the formwork and binding the reinforcing bars for the pier; (7) pouring and curing the concrete for the pier; and (8) dismantling the bracket structure except for the clamps. This invention is designed for piers located in mountainous areas with complex topography, large ground undulations, and located on cliffs with the bottom part suspended, improving the safety and efficiency of construction of suspended piers on cliffs, reducing damage to the original topography, and achieving green construction.

This utility model relates to a steering wheel walking mechanism for ridged planting land, comprising a frame, a drive assembly, and tracks. The drive assembly is mounted on the frame, and a mounting frame is located on the outer bottom of the frame. A drive wheel is located on the top of the mounting frame, and the drive assembly drives the drive wheel to rotate. Two pairs of support wheels are located at the bottom of the mounting frame. The tracks are wound around the drive wheel and the two pairs of support wheels, and are driven by the drive wheel. The steering wheel walking mechanism for ridged planting land provided by this utility model, by combining the mounting frame located on the outer bottom of the frame with the tracks, raises the height of the frame, thereby increasing the height of the chassis mounted above the frame. When moving on ridged planting land, it can prevent the chassis above the frame from colliding with the ridge. By increasing the ground clearance of the chassis and optimizing walking stability, agricultural machinery can adapt to complex terrain between ridges.

The invention discloses a current collection line foundation concrete pouring tool suitable for special mountain terrains, and relates to the technical field of mountain concrete pouring, the current collection line foundation concrete pouring tool comprises supporting legs, the inner sides of the supporting legs are provided with lifting mechanisms, the exteriors of supporting columns are fixedly connected with first toothed plates, and the inner sides of the supporting legs are provided with auxiliary supporting mechanisms; a rotating seat is fixedly connected to the upper side of the supporting column, a levelness sensor is fixedly connected to the inner side of the mounting groove, a modular template is fixedly connected to the upper side of the supporting frame, a mounting plate is positioned and mounted on the upper side of the top plate, a slicking mechanism is mounted at the top of the mounting plate, and a deflection mechanism is mounted on one side of the mounting plate. According to the device, mountain self-adaptive horizontal adjustment is achieved through locking of the adjustable supporting legs and the toothed plate, and hydraulic dependence is reduced; the motor is used for driving the linkage scraping plate and the vibrating device, leveling and compacting operation is synchronously completed, the pouring quality is improved, the overall design considers terrain adaptability, construction precision and energy consumption optimization, and the concrete construction efficiency under the complex terrain is remarkably improved.

The utility model discloses a weed monitoring robot, and belongs to the technical field of robots. A weed monitoring robot comprises a chassis, wheels are rotationally installed on the two sides of the chassis, the weed monitoring robot further comprises a mechanical arm fixedly installed on the top of the chassis, and an electric clamping jaw used for collecting weeds is fixedly installed at the end of the mechanical arm; through the cooperation of the motor, the driving wheel A, the driving wheel B, the crawler belt and other structures, the crawler belt can adapt to rugged terrains and has excellent trafficability, the triangular front wheel crawler belt can better adapt to uneven and complex terrains, such as rock, muddy and snowfield environments, and the crawler belt provides a larger grounding area, is not prone to rollover, and has a good application prospect. Therefore, the cross-country performance and the gradeability of the robot are improved, the vehicle is more stable when climbing a steep slope, the risk of rollover is reduced, and the robot is suitable for monitoring in an environment with complex geographical conditions.

The utility model relates to the field of constructional engineering, and discloses a hydraulic hoisting frame for constructional engineering, which comprises a base, the top end of the outer wall of the base is fixedly connected with a fixed column, the bottom end of the outer wall of the base is rotatably connected with four groups of universal wheels, the top end of the outer wall of the fixed column is provided with a hoisting mechanism, and the surface of the base is provided with an unfolding assembly. And the unfolding assembly comprises a rotating disc, four sets of inclined grooves are formed in the surface of the rotating disc, a connecting base is fixedly connected to the top end of the outer wall of the rotating disc, and an inserting rod is elastically connected to the inner wall of the top end of the connecting base through a limiting spring. According to the utility model, the rotating disc, the sliding block, the hinge rod and the connecting rod in the unfolding assembly are matched, so that the supporting assembly can be rapidly unfolded and folded to adapt to different site conditions. And the supporting position of the lifting frame can be conveniently adjusted no matter in a narrow space or a complex terrain, so that the universality and the practicability of the lifting frame are improved.

The present application relates to the technical field of three-dimensional point cloud data processing, in particular to a point cloud hole repairing method and system based on adaptive neighborhood and genetic fuzzy. For unorganized point cloud data, first, the curvature, normalized curvature and local density coefficient of each point are calculated through principal component analysis, and adaptive neighborhood with adaptive local geometric features is dynamically generated in combination with the reference neighborhood; then, based on the adaptive neighborhood, boundary features are extracted and hole boundary points are screened, and single-hole boundary sets are obtained through connected component division; subsequently, a single-hole local projection plane is constructed to generate two-dimensional repair points, after global overlap and deduplication, a fuzzy reasoning system optimized by a genetic algorithm is used to estimate the height coordinates of the repair points, three-dimensional repair points are generated to complete hole filling. The present application effectively improves the boundary recognition accuracy in high-curvature areas with uneven density, while taking into account the edge continuity and surface smoothness, and is suitable for complex topography unorganized point cloud hole repair scenarios.

The utility model discloses a kind of multifunctional weather sensors with multidirectional fixing, belong to meteorological monitoring equipment technical field, a kind of multifunctional weather sensors with multidirectional fixing, including base and sensor main body, the top of the base is fixedly connected with connecting rod one, one end of the sensor main body is fixedly connected with connecting rod two, connecting rod one and connecting rod two are fixedly connected by fastener, the bottom of the base is fixedly installed with two U type long screws, the bottom of the sensor main body is equipped with battery compartment, it can effectively solve the single installation direction of traditional weather sensor, the problem that fixed posture is not flexible, satisfy complex topography and multidirectional data acquisition scene under the diversification demand to monitoring position and angle, simultaneously overcome the defect that power supply mode single leads to power shortage, equipment shutdown when long time monitoring in field, improve the comprehensiveness, accuracy, continuity and reliability of meteorological monitoring work.

The application discloses a method for accurately obtaining three-dimensional surface topography of a sprayed coating, and belongs to the technical field of coating surface treatment. A sample to be measured is placed inside an envelope formed by small columns; the sample to be measured and the small columns are solidified, polished and photographed to obtain a cross section of the sample to be measured; the polishing and photographing steps are repeated, and the polishing thickness is not more than 1 / 10 of the minimum feature of the surface fluctuation of the sample to be measured in the direction parallel to the upper surface of the sample to be measured; finally, the obtained cross section photos are imported into software with functions of reading and drawing graphs, two-dimensional topography curves of the cross section features of the combined sample and different positions of the sample to be measured in the cross section of the combined sample are extracted, and the two-dimensional topography curves are imported into software for constructing three-dimensional topography and placed according to the position relationship determined in the foregoing to obtain three-dimensional topography features of the sample to be measured. The method can more accurately predict the stress distribution and crack initiation and propagation behavior of the coating at complex topography during service.

The invention discloses a surface topography detection probe device and method based on active deflection compensation, and the device comprises an up-down displacement measurement module which is used for carrying out the measurement of the vertical displacement of a contact probe through a split type multi-polar-plate capacitive sensor structure; the up-and-down force balance control module and the up-and-down displacement measurement module form a second closed-loop control system and are used for controlling the contact force between the contact pin and the surface of the sample to be constant; the front and back deflection measurement module is used for detecting the deflection amount of the contact pin in the scanning direction; the front-back deflection control correction module and the front-back deflection measurement module form a first closed-loop control system and are used for calculating required correction torque through a closed-loop control algorithm and applying reverse driving force to counteract deflection caused by shearing force, and the two closed-loop systems work cooperatively to control the probe in the horizontal direction and the vertical direction. The problems that when an existing probe scans a complex shape, a track deviates due to shearing force, and the signal-to-noise ratio of displacement measurement is insufficient are solved.

The application discloses an intelligent wind power tower drum outer wall polishing system and method, and relates to the technical field of outer wall polishing.The system comprises the following steps: determining a surface topography topology map; generating a preset outer wall polishing path, combining the hardness of the tower drum material with the grinding tool wear coefficient to determine the grinding head pressure-rotation speed matching parameters; introducing mechanical arm pose data, combining the tower drum outer wall corrosion depth data to determine the first error compensation data; through the wind power tower drum outer wall polishing task, combining the tower drum outer wall weld to determine the second error compensation data; connecting multiple mechanical arms for collaborative work, combining the first error compensation data and the second error compensation data to configure a master-slave control architecture, and performing outer wall polishing multi-end collaborative control on the target wind power tower drum by the master-slave control architecture.The application solves the technical problem that the prior art cannot realize high-precision collaborative polishing of the wind power tower drum outer wall under complex topography, and achieves the technical effect of improving the wind power tower drum outer wall polishing precision and operation consistency.

The utility model discloses a highway slope protection reinforcing system capable of adapting to complex terrains, which comprises two supports respectively anchored on the slope top or the slope toe of a highway slope, a protection plate hinged between the two supports and anchored with the slope surface of the slope through a plurality of first inserting drill rods at the bottom of the protection plate, and a plurality of second inserting drill rods at the bottom of the protection plate. The road slope protection device has the beneficial effects that road slopes with different gradients can be protected through matched use of the support and the protection plate, the application range is widened, meanwhile, rainwater gathered on the slope top can be guided through the flow guide cover arranged on the protection plate, water and soil loss caused by the fact that the rainwater makes contact with the slope surface is avoided, and in addition, the service life is prolonged. The multiple partition plates arranged in the flow guide cover can store water when water flow is rapid, the weight increasing effect on the protection plate is achieved, the anchoring strength of the first inserting drill rod and the slope surface is effectively improved, the protection plate is prevented from being impacted by strong water flow to be separated from the slope, and the protection and reinforcement effect is further improved.

The utility model relates to a measuring device for a subway tunnel segment structure. According to the measuring device for the metro tunnel segment structure, the adjusting table is arranged so that the measuring angle in the vertical direction can be well adjusted in the using process, and the supporting sliding rod is arranged so that the measuring height can be flexibly adjusted in the using process; when a complex terrain is encountered, a worker can control the fixing assembly to enable the device to be installed on a corresponding solid obstacle, so that it is guaranteed that the device can have a good installation effect in the using process, and it is guaranteed that the device can have good stability in the using process; by arranging the adjusting assembly, a worker can conveniently adjust the measuring angle of the measuring instrument in the horizontal direction in the using process of the measuring instrument, so that the flexibility of the measuring instrument in the using process can be ensured, and different measuring requirements can be met.

The utility model discloses an agricultural seeder and relates to the technical field of agricultural mechanical equipment. Comprising a headstock; the seeding equipment is arranged on the rear side of the vehicle head and is detachably connected with the vehicle head; and the gravity center adjusting assembly is arranged at the bottom of the vehicle head and used for changing the gravity center of the vehicle head. The seeding equipment is driven by the vehicle head to perform seeding work, and the gravity center of the device can be adjusted through the gravity center adjusting assembly during movement, so that the risk of rollover of the device during movement on complex terrains is reduced, and the adaptability of the device to mountain and hill landforms is improved.

The utility model discloses a construction platform for photovoltaic construction, including the platform board of the holding mechanism and the firm setting of holding mechanism for detachable connection on photovoltaic pipe stake, holding mechanism includes the shell with installation cavity and at least one holding component of installing in installation cavity can with shell intercoordination to hold photovoltaic pipe stake. The utility model discloses reasonable in structure, convenient to use, high safety and strong practicality, the utility model discloses can be installed on photovoltaic pipe stake and use easily, and installation is simple and quick, and time -saving and labor -saving can significantly improve construction efficiency, and the utility model discloses is not restricted by the complex topography of construction site, even if the uneven ground of construction site still can be firmly fixed on photovoltaic pipe stake, can effectively improve the safety of construction. The utility model discloses is suitable for using when photovoltaic construction.