188 results about "Soil resistance" patented technology

The invention discloses a soil resistance perception-based multi-mode adaptive subsoiling mechanism, which comprises an integral rack, a subsoiling monomer, a control system and an energy device, the subsoiling monomer detects soil resistance in real time through a sensor assembly and transmits the soil resistance to the control system, and the control system controls the subsoiling monomer according to the magnitude and change characteristics of the soil resistance. The subsoiler is automatically switched among three modes of traditional rigid connection subsoiling, self-excited vibration subsoiling and forced vibration subsoiling; when the soil resistance is smaller than a first preset threshold value, a rigid connection mode is adopted; when the resistance is between a first preset threshold value and a second preset threshold value, a self-excitation vibration mode is started; and when the resistance is greater than a second preset threshold value, the vibration motor is started to realize forced vibration. The control system not only monitors the resistance absolute value, but also analyzes the time characteristic to realize intelligent threshold adjustment. The problems that a traditional subsoiling mechanism is high in energy consumption and poor in adaptability are solved, and the intelligent subsoiling mechanism has the advantages of intelligent operation mode switching, optimized energy utilization, adjustable vibration parameters and the like.

The invention provides an open caisson sinking control method based on dynamic balance of a soil resistance field, which comprises the following steps of: judging whether an open caisson posture dynamic balance condition is met or not according to an open caisson bottom surface soil resistance vector field and an open caisson posture offset, if not, intervening space distribution of the open caisson bottom surface soil resistance vector field, and reconstructing the open caisson bottom surface soil resistance vector field; the dynamic balance condition of the open caisson posture is met; and based on the open caisson bottom surface soil resistance vector field, the height difference vectors of the adjacent bins on the open caisson bottom surface and the soil taking control matrix, a dynamic decision objective function is constructed, the objective function is solved, an optimal soil taking control matrix is obtained, and an actuator cluster is controlled to take soil from the bins on the open caisson bottom surface. According to the method, the influence of dynamic evolution of the soil resistance field of the bottom face of the open caisson on the open caisson attitude offset is considered, the soil resistance field is dynamically adjusted, the open caisson attitude is accurately controlled, and soil taking control is optimized.

The invention discloses an oil and gas pipeline stray current corrosion degree multi-mode quantitative evaluation method and system. The method comprises the steps that stray current parameters, potential gradient distribution and magnetic field intensity data of an oil and gas pipeline are collected in real time; dynamic current density characteristics are extracted from the stray current parameters, and a corrosion hot spot area is constructed according to the dynamic current density characteristics and potential gradient distribution; on the basis of the corrosion hot spot area, the magnetic field intensity data and the soil resistivity parameter are fused, and a stray current corrosion intensity index is calculated; and establishing a corrosion rate prediction model based on the historical stray current corrosion intensity index and the environmental variable, inputting the currently calculated stray current corrosion intensity index into the corrosion rate prediction model, and outputting the corrosion degree and the residual safety life of the pipeline. According to the method, multi-modal information such as dynamic current density characteristics, potential gradient distribution and soil resistivity can be integrated, the corrosion hot spot area can be accurately identified, and the accuracy of the evaluation result of the stray current corrosion degree of the oil and gas pipeline is improved.

The invention relates to the technical field of vegetation root system nondestructive testing, in particular to a multispectral vegetation root system identification system and method based on a differentiable physical engine, and the system comprises a multispectral LiDAR module which is used for transmitting near-infrared laser and short-wave infrared laser, scanning a target area, obtaining dual-wavelength reflectivity data, and determining the vegetation root system according to the dual-wavelength reflectivity data; generating a reflectivity ratio matrix by adopting a reflectivity ratio classification model; the differentiable physical engine is used for quantizing the dynamic relationship between the vegetation root growth rate and the soil resistance by adopting a coupling model according to the reflectivity ratio matrix, generating a physical model and updating the physical model at a preset time interval; and the data processing and three-dimensional modeling module is used for generating a three-dimensional root system model and a health assessment result according to the reflectivity ratio matrix and the physical model, and outputting the three-dimensional root system model and the health assessment result. According to the scheme, soil penetration and root system and foreign matter distinguishing can be carried out, the vegetation native environment is not damaged, dynamic monitoring analysis is carried out, and the accuracy of recognition analysis is improved.

The invention discloses a stress calculation method of a composite pull disc and a weaving method of the composite pull disc and an insulation rope section, belongs to the field of electric power tools, solves the problem that stress of the composite pull disc is difficult to assess, and adopts the technical scheme that the composite pull disc comprises a pull wire disc and a pull wire, one end of the pull wire is fixed on a tower, and the other end of the pull wire is fixed on the pull wire disc; the stay wire disc is installed on the ground and is used for the upward pulling force acting on the stay wire foundation, the calculated volume weight of soil, the included angle between the stay wire and the ground, the foundation upward pulling stability safety coefficient related to the soil resistance, the upward pulling stability safety coefficient related to the self-gravity of the foundation, the volume of anti-pulling soil in the depth, the upward pulling angle of the foundation and the self-gravity of the foundation. Wherein the upward pulling stability of the stay wire needs to be met. According to the invention, the stress evaluation of the composite pull disc is realized more conveniently.

The present invention relates to the technical field of electric power safety protection, and particularly relates to a method for monitoring and evaluating the corrosion state of a grounding grid. The method comprises the steps of: acquiring a soil environment pH value of a grounding grid region; acquiring a soil Cl ion concentration of the grounding grid region; acquiring a corrosion potential of the grounding grid region; acquiring a corrosion rate of the grounding grid region; and on the basis of a soil resistivity, the soil environment pH value, the soil Cl ion concentration, the corrosion potential and the corrosion rate, determining the corrosion state of a grounding grid. Thus, by means of introducing determination parameters of a soil resistivity, a soil environment pH value and a soil Cl ion concentration, the corrosion state of a grounding grid can be more accurately determined and evaluated, such that the operational safety and service life of a substation grounding grid are more effectively evaluated, thereby providing technical support for electric power operation and maintenance personnel to take more scientific and rational maintenance measures.

The invention discloses a grouting splitting pressure simulation device under high-ground and high-water-pressure conditions, and relates to the technical field of tunnel and underground engineering model tests. A first water permeable unit controlled by the water injection unit and a second water permeable unit controlled by the confining pressure unit are respectively arranged at two ends in the length direction, so that water pressure and stratum confining pressure are independently applied. The integrated grouting unit of the device is used for grouting soil in the box and is provided with a comprehensive detection unit, the comprehensive detection unit monitors various parameters such as grouting pressure, water pressure, confining pressure, flow, soil resistance and wave velocity in real time, and independent loading and accurate dynamic control of the grouting pressure, formation water pressure and formation stress can be achieved; therefore, the grouting process of the deep-buried tunnel under the conditions of different burial depths, high water head differences and complex grout characteristics can be simulated in a laboratory with high precision, and the technical bottleneck that the complex environment of high ground stress and high water pressure coupling is difficult to reproduce in a traditional test method is effectively solved.

The invention discloses a grounding resistance thermal-electric coupling prediction method and system suitable for various soil scenes. The method comprises the following steps: acquiring an electrode parameter, a soil parameter, a grounding fault parameter and initial temperatures of an electrode and soil; calculating an electrode current and a soil leakage current of the time step based on the electrode and soil resistivity of the time step; based on the electrode current and the soil leakage current of the time step, calculating the electrode temperature, the soil radial temperature distribution and the grounding potential rise of the time step by adopting a finite difference method; based on the electrode temperature and soil radial temperature distribution of the time step, updating the electrode resistivity and the soil resistivity of the time step + 1; if the end of the fault time is not reached, returning to continuously calculate the temperature of the electrode and the soil at the time step + 1; otherwise, outputting the electrode temperature and soil radial temperature distribution of each time step. According to the invention, thermal-electric dynamic coupling is considered, and accurate evaluation of the performance of the grounding system is realized.

The invention relates to the field of data analysis, in particular to a farmland soil compaction diagnosis method based on multi-source sensor data, and the method comprises the steps: carrying out the gradient energy feature construction and phase alignment cross-correlation evaluation of soil resistance depth curve data, and obtaining a gradient energy phase locking factor; carrying out rheological consistency coupling evaluation on the morphological characteristics of the soil resistance depth curve and the soil volume moisture content to obtain a rheological morphological coupling factor; performing joint correction on the basic Euclidean distance to obtain an adaptive similarity distance and executing clustering iteration; spatial modeling and prescription mapping are carried out on a clustering result and sampling point position information, so that a soil compaction accurate diagnostic graph is obtained, and a differentiated subsoiling operation instruction is generated; the method solves the problem that the existing Euclidean distance easily causes the characteristic dislocation of the compaction layer and the deformation of the rheological strength under the condition of farmland micro-topography fluctuation and water content difference to cause the distortion of the clustering partition.

The invention discloses a multi-port resistance measurement and corrosion positioning integrated system for a grounding grid, relates to the technical field of resistance measurement and corrosion positioning, and is used for solving the problems that the soil resistivity greatly fluctuates along with the moisture content due to high moisture content and complex change of a clay field: the conductive ion concentration is increased and the conductive performance is enhanced due to increase of the moisture content in soil; and the resistivity is obviously reduced. Apparent conductivity and noise level are monitored in real time, self-adaptive switching is carried out between regional flow injection and selective flow injection, and high-precision resistance data can still be obtained under extreme working conditions such as alternation of wetting and drying or sudden increase of noise in combination with an automatically-adjusted current amplitude; all branch resistors are jointly solved through a parallel conjugate gradient inversion algorithm, and confidence quantification is performed on a positioning result by using a posterior covariance matrix to output a thermodynamic diagram; and the early warning closed-loop module introduces the current moisture content, the signal-to-noise margin and the flow increasing rate into real-time correction of a threshold and life model, triggers grading alarm and automatically generates a maintenance work order.

The invention provides a Kirchhoff's law-based power distribution network line loss abnormity positioning method and device, and the method comprises the steps: obtaining the temperature, moisture content and salt content parameters of soil through a multi-sensor integrated monitoring probe, embedding a special temperature and humidity sensor for a frozen soil region in the top of the multi-sensor integrated monitoring probe, and embedding a soil moisture content TDR probe in the middle of the multi-sensor integrated monitoring probe, a salt content monitoring conductivity sensor is embedded in the bottom; constructing a permafrost region resistivity correction model based on the parameters; a dynamic compensation Kalman filtering algorithm is adopted to process a model output value, and the output dynamic correction soil resistivity is transmitted to a grounding electrode detector host; and the host fuses the correction value and the electromagnetic signal acquired by the electromagnetic signal receiving sensor, and outputs the distribution state of the grounding electrode. According to the invention, a multi-sensor integrated probe is used to acquire parameters to construct a model, and a correction value and an electromagnetic signal are fused after dynamic correction by a Kalman filtering algorithm, so that the detection precision of the plateau permafrost region is improved.

The invention provides a test device and method for simulating pile wall integrated whole process performance evolution, and belongs to the technical field of underground structure pile wall simulation. Comprising a measuring device, a supporting device, a self-reaction force device erected above the supporting device, a restraining device placed on the upper surface of the supporting device, a test piece placed on the upper surface of the restraining device and a loading device fixed to the bottom of the self-reaction force device. The loading device is used for applying a load to the surface of a test piece to simulate active side soil pressure, the restraining device comprises a rolling shaft, a spring base plate and a fixed base plate, the test device simulates horizontal supporting counter-force of a foundation pit and resistance of soil below an excavation face of the foundation pit through the spring base plate and the fixed base plate in sequence, and the test progress is controlled through the measuring device. And recording the whole experiment process. Soil spring and support effects can be simulated by using different types of base plates, the spring base plate can well simulate soil layer conditions, and the fixed base plate has good support simulation conditions due to high rigidity.

This invention discloses a method for dynamic perception and intelligent precise control of multimodal data in the sludge solidification construction process, belonging to the field of intelligent control of engineering machinery. This method collects the global pose of the machine body, driving power parameters, and visual image sequences containing high-position markers. Utilizing a vision-inertial fusion algorithm for engineering machinery with kinematic constraints, it calculates the real-time three-dimensional trajectory and attitude of the mixing head underground while resisting sludge obstruction and vibration interference. Furthermore, it discretizes the mixing trajectory to construct the effective sweep volume of micro-element trajectory segments and, combined with adaptive soil resistance indicators, establishes a physical closed-loop control model based on the target unit volume grouting density. This invention abandons traditional linear empirical control logic and solves the problem of uneven distribution of solidifying agent caused by the tilting and variable speed motion of the mixing head by real-time matching of sweep volume and grouting energy, achieving microscopic calculation control and full-process traceability of the construction quality of concealed works.

This invention discloses a method, system, equipment, and storage medium for calculating the deformation of a pipe-jacking structure considering the soil resistance between the pipe and culvert. The method includes the following steps: S1. Simplifying the pipe-jacking structure as an elastic thin plate, and further simplifying the problem to the deformation of an elastic thin plate with fixed opposite sides and simply supported opposite sides under a uniformly distributed load on a Winkler elastic foundation, obtaining the differential equation of the bending surface of the thin plate on the Winkler elastic foundation and the expression for the boundary conditions of the thin plate; S2. Determining the elastic modulus when the pipe-jacking structure is simplified to an elastic thin plate, and calculating the bending stiffness D of the pipe-jacking structure; S3. Solving the differential equation of the bending surface of the thin plate on the Winkler elastic foundation using a hybrid solution method combining trigonometric series and the force method, obtaining the deflection formula of the elastic thin plate placed on the elastic foundation under a uniformly distributed load. This invention can accurately predict the deformation of pipe-jacking structures.

The utility model discloses a kind of conductor shielding terminal annular array ground structure, the utility model relates to electrical engineering technical field, the utility model, comprising: connecting end, the outer wall of the connecting end is slidably connected with annular device, the annular device is locked by rotating mode, the bottom of the annular device is fixedly connected with grounding device, the annular device includes receiving end;By setting the cooperation of annular device and grounding device, the contact of the circumferential array arrangement in receiving end inner wall is slidably connected with connecting end, forms 360 ° full circumferential conductive passage, compared with traditional single-point grounding mode, contact area is improved by more than 3 times, lock ring is rotated 30 ° by dialing dial piece, the locking of connecting end and annular device can be completed, main sharp cone cooperates bulldozing block design, soil resistance is reduced, can directly penetrate clay layer with greater hardness;Sub sharp cone is automatically unfolded in soil extrusion during soil entering, forms umbrella-like grounding network, the purpose of equivalent grounding area expansion.

The utility model relates to a heavy metal contaminated soil remediation agent spraying device, which comprises a frame, a front wheel and a rear wheel are respectively arranged on the frame, and the heavy metal contaminated soil remediation agent spraying device is characterized in that a soil turning device and a spraying device are respectively arranged on the frame; wherein the soil turning device comprises a mounting frame rotationally arranged on the lower side of the frame and a driving component for driving the mounting frame to swing and turn over, and a plurality of plowshares are arranged on the mounting frame at intervals in the direction from the front wheels to the rear wheels. The plowshares located on the mounting frame swing along with the mounting frame to form soil turning depths of different horizontal depths relative to the frame, so that the soil turning depths of the plowshares are controlled, the plowshares are arranged in a step-shaped progressive increase mode, layered soil turning is achieved, soil resistance is reduced, a repairing agent is sprayed to the turned soil in cooperation with the spraying device, and the soil turning efficiency is improved. Therefore, the remediation agent can be quickly and uniformly dispersed to remedy the soil.

The invention discloses an automatic weeding device for solanaceous fruit farmland and a using method, and relates to the technical field of agricultural equipment.The weeding device is characterized in that a weeding assembly is arranged in a weeding outer shell, the resistance of a main blade during weeding is increased, and the main blade drives a sliding rod to slide in a U-shaped flow channel in a hydraulic shell; the first piston pushes the second piston to slide in the U-shaped flow channel through hydraulic oil in the U-shaped flow channel, the second piston pushes the soil loosening teeth to be ejected out, and the soil breaking cones at the front ends of the soil loosening teeth loosen soil. Soil is loosened through the soil breaking cones at the front ends of the soil loosening teeth, the device can go deep into the soil to bring out weed root systems, the problem that a traditional device only removes stems and leaves and residual root systems is solved, the weed removal rate is remarkably increased, and when the soil loosening teeth stretch out, the limiting blocks abut against the vertical faces of the wedge-shaped check blocks to form mechanical limiting; retraction of the soil loosening teeth caused by soil resistance in the soil loosening process is prevented, and it is ensured that the soil breaking cone continuously goes deep into soil.

The invention provides an equivalent circuit analysis method and system for soil resistance heating efficiency, and relates to the technical field of soil remediation. Resistivity distribution data and salt content distribution data of a pile space are obtained; calculating the ionic conductivity according to the salt content distribution data, and calculating the target conductivity of each grid unit; constructing a topological graph, and constructing a weighted adjacent matrix based on the topological graph; constructing a degree matrix according to the degree of each graph node to obtain a feature value sequence and a feature vector corresponding to each feature value; extracting a second small feature value from the feature value sequence as a connectivity index, and marking a mutation position as a weak connection interface; the blocking factor is determined by counting the number of graph nodes located at the weak connection interface, the equivalent circuit transmission efficiency representing the soil resistance heating efficiency is calculated based on the negative correlation between the connectivity index and the blocking factor, and accurate quantitative evaluation of the heterogeneous soil resistance heating efficiency is achieved.

This invention provides a method for simulating buckling of subsea pipelines based on the pipeline element method, addressing the problems of low computational efficiency, complex modeling, and low accuracy in existing methods. Based on Euler-Bernoulli beam theory, this invention models the pipeline as a series of efficient pipeline elements. Internal pressure is converted into equivalent temperature rise, and the effective thermal expansion force generated by the effective temperature rise is applied to both ends of the pipeline element to construct the total potential energy equation. The second derivative of the total potential energy equation is performed to obtain the tangent stiffness matrix of the pipeline element. An updated Lagrange method is used for coordinate transformation. The secant relationship is used to calculate the pipeline element and soil resistance. A Newton-Raphson incremental-iterative numerical program is established to perform nonlinear analysis of the pipeline, progressively solving for the deformation and stress of the pipeline under complex loads. This invention significantly reduces the number of elements, improves computational efficiency, and accurately simulates nonlinear pipe-soil interactions. It is applicable to various pipelines, including short pipes, long pipes, and corroded pipes, as well as complex working conditions such as high temperature and high pressure.

The utility model discloses a termite cave detector which comprises a shell, two protective sleeves are arranged on the outer wall of the shell, and each protective sleeve is of an internal hollow structure. A central cylinder is arranged in the shell, a spring detection structure is arranged at the bottom end of the central cylinder, and a detection needle head is arranged at the bottom end of the spring detection structure; the detection needle head of the spring detection structure is used for sensing soil resistance mutation (the density of the ant cave area is reduced), mechanical signals are directly fed back, the detection result of the ant cave area is obtained, the cotton thread sensing structure is used for triggering the indicating rod by means of sinking of the gravity block after moisture absorption, humidity changes are synchronously reflected, and through humidity changes of soil near the ant cave area, the ant cave area is detected. In the detection process, electronic elements or external energy sources are not needed, and therefore the termite cave detection device is suitable for long-term use.

The present application relates to a kind of rock-socketed foundation bearing capacity compensation design method considering rock mass constraint, comprising: establishing rock-socketed foundation calculation model, determine its consolidation boundary condition in rock layer;Calculate the horizontal soil resistance of triangle distribution produced when foundation rotates;Solve the resisting moment of horizontal rock resistance to base center;The deformation of base is decomposed into integral subsidence and rotating component;Determine the calculation formula of base zero stress point position, and establish base vertical pressure distribution model;Establish the overall balance equation group, and solve the foundation rotation angle and zero stress point position by iteration calculation;Calculate the maximum compressive stress of base and evaluate the bearing capacity compensation effect;Finally, section internal force analysis and reinforcement design are carried out.The present application provides additional resisting moment by quantifying rock mass constraint, effectively reduces the maximum compressive stress of base, provides theoretical basis and technical support for improving foundation bearing capacity and optimizing foundation size, and is especially suitable for rock-socketed foundation design in high intensity seismic region.

The invention discloses an inland waterway ultra-long steel sheet pile vibration piling device, and relates to the technical field of waterway engineering, the inland waterway ultra-long steel sheet pile vibration piling device comprises a piling hammer, the bottom of the piling hammer is provided with a steel sheet pile, a physical disturbance assembly and a gas-liquid energy regulation and control assembly, and the gas-liquid energy regulation and control assembly is arranged on one side of the outer wall of the physical disturbance assembly; under cooperation of the physical disturbance assembly and the gas-liquid energy regulation and control assembly, efficient and accurate pile sinking is integrally achieved, piling operation is more stable and reliable, by means of linkage of a high-frequency sound wave generator and a soil resistance monitoring probe and cooperation of flexible adaptation of a corrugated pipe, soil around the pile can be pre-disturbed through high-frequency vibration, pile sinking resistance is reduced, and the pile sinking efficiency is improved. The posture of the pile body can be corrected in real time through dynamic adjustment of a micro hydraulic actuator and a ball hinge joint in the pile sinking process, pile body bending caused by rigid collision is avoided, and meanwhile, high-pressure jet flow and an air film can be isolated and directly reach key areas around the pile through three layers of nested nozzles and inner and outer layer pipelines of the gas-liquid energy regulation and control assembly.

The invention relates to the field of slope supporting, and aims to provide a semi-prefabricated L-shaped rear supporting retaining wall and a construction method thereof. A semi-prefabricated L-shaped rear-supporting retaining wall comprises a plurality of H-shaped steel with openings opposite to each other. The steel partition plate and the H-shaped steel form a structure shaped like a Chinese character'wang ', and an inserting groove is formed between the steel partition plate and a slope-facing side flange plate of the H-shaped steel; the semi-prefabricated supporting retaining wall is inserted into the inserting groove; the L-shaped rear support comprises a first side plate and a second side plate, the first side plate is connected with the semi-prefabricated support retaining wall, and the second side plate is connected to the bottom of the first side plate; the formwork is arranged at the top of the first side plate, and a rear pouring area is formed among the formwork, the H-shaped steel and the partition plate; the semi-prefabricated supporting retaining wall comprises a concrete retaining wall and a first reinforcement cage, the first reinforcement cage is embedded in the concrete retaining wall, one side of the first reinforcement cage extends to the post-pouring area, and concrete is poured in the post-pouring area. The structure is good in stability and convenient to construct, and has good lateral soil resistance and supporting capacity.

The invention relates to a pile group foundation p-y curve correction method considering the frozen soil foundation rigid shell effect. The pile group foundation p-y curve correction method comprises the steps that a foundation is divided into an upper frozen layer and a lower unfrozen layer in the depth direction; based on the average ratio of the average soil resistance of the group piles of the unfrozen soil layer at the depth z of the frozen soil field to the average soil resistance of the group piles at the depth z under the natural unfrozen foundation condition in different horizontal displacement y states, the rigid shell effect influence coefficient is obtained; introducing into a natural unfrozen foundation pile group reference p-y curve model for correction, and constructing a corrected p-y curve model of an unfrozen layer in the frozen soil foundation; and in combination with a pile group p-y curve model in a frozen layer, a total pile group foundation p-y curve model is constructed and used for horizontal bearing analysis and design of the frozen soil foundation pile group foundation, so that the weakening rule of the development degree of the rigid shell effect on the horizontal bearing capacity of an unfrozen layer is quantitatively described, and the precision of horizontal bearing analysis of the pile group foundation is improved.

The invention belongs to the field of building construction, and particularly relates to a self-adaptive clamping type pipe pile clamping mouth device. In the piling process, soil resistance and piling impact force enable the pipe pile to generate vibration and displacement trends, when two limiting plates are subjected to upward impact force, reinforcing plates are made to move towards one side of a clamping plate through linkage assemblies, the two sides of the pipe pile can be reinforced, the reinforcing plates are matched with clamping force formed by the clamping plate, a double reinforcing mechanism is formed, and the reinforcing effect of the pipe pile is improved. The clamping force on the pipe pile is increased, the phenomenon that pile driving errors or quality problems are caused due to the fact that the pipe pile deviates is avoided, and the stability of the pipe pile in the pile driving process is greatly improved.

The invention belongs to the technical field of laying quality testing, and particularly relates to a submarine cable laying quality testing machine and a using method thereof.The submarine cable laying quality testing machine comprises a base pipe base, a top pipe base, a resistance measuring type positioning mechanism, a resistance increasing type slow descending mechanism and a butt-joint type protection mechanism, and the top pipe base is arranged above the base pipe base; the oppositely-closed protection mechanisms are arranged on the side wall of the base pipe base and the side wall of the top pipe base correspondingly, the resistance measuring type positioning mechanism is arranged at the bottom of the base pipe base, the resistance increasing type slow descending mechanism is arranged on the bottom wall of the base pipe base, and the resistance measuring type positioning mechanism comprises a prediction assembly and a soil inserting assembly. According to the quality testing machine for submarine cable laying and the using method thereof, the soil resistance below a cable laying area can be monitored in real time, the sunken cable can be protected, the dramatic increase of the traction force of the cable is avoided, and safe and stable operation of the cable is guaranteed.

This utility model discloses a multi-speed adjustment device for a micro-tiller, relating to the field of micro-tiller technology. It includes a speed control box, inside which are an input shaft and an output shaft. Both ends of the output shaft extend out of the speed control box and are equipped with connecting flanges. Multiple gears are mounted on the input shaft. A rotating tube is rotatably mounted outside the output shaft. A transmission gear is mounted outside the rotating tube, and multiple fixing blocks are mounted on the transmission gear. A transmission tube is sleeved on the output shaft, and a keyway is formed inside the transmission tube. A transmission key that mates with the keyway is provided on the output shaft. An installation groove is formed on the inner wall of the speed control box, and a support plate is slidably mounted inside the installation groove. Power is transmitted to the transmission tube through the fixing blocks and transmission blocks, driving the output shaft to rotate. By switching the engagement of different gears, multiple speed outputs of the output shaft can be achieved, adapting to different soil resistance and tillage depth requirements, and making gear switching faster.

The invention discloses a small scarifier power transmission device based on soil resistance feedback, and relates to the technical field of scarifiers, the small scarifier power transmission device comprises a machine shell and a rotating rod rotationally connected between two opposite inner walls of the machine shell, and the side wall of the rotating rod is provided with a plurality of groups of scarifying pieces; the soil loosening device further comprises a driving mechanism arranged on the machine shell and used for driving the soil loosening teeth, the driving mechanism comprises a driving box fixedly connected to the machine shell, the driving box is rotationally connected with a driving rod, and the driving rod is connected with the rotating rod through a transmission assembly. According to the small scarifier power transmission device based on the soil resistance feedback, through the arrangement of the driving mechanism, power transmission of all the scarifying teeth is achieved, and meanwhile by means of the arrangement of the power adjusting assembly, under the cooperation effect of the pushing assembly and the moving assembly, the scarifying teeth can be conveniently adjusted according to the hardness of soil to be scarified; and the rotating speed of each soil loosening tooth is automatically adjusted.

The present invention discloses a method for optimizing the calculation of the horizontal ultimate bending bearing capacity of a large-diameter single pile for offshore wind turbines, comprising the following steps: (1) determining the geometrical dimension parameters of the large-diameter single pile; (2) measuring the undrained shear strength distribution of the seabed foundation soil; (3) determining the depth of the rotation point of the large-diameter single pile and the length from the rotation point to the pile bottom under the action of horizontal bending moment load; (4) calculating the contribution M of the soil in the depth range above the rotation point to the bending bearing capacity of the large-diameter single pile based on the horizontal ultimate soil resistance distribution around the pile. u1 (5) Calculate the contribution of the soil below the rotation point to the bending bearing capacity of the large diameter single pile based on the failure mode of the soil below the rotation point. u2 (6) The ultimate horizontal bending bearing capacity of a large diameter single pile M is finally calculated. u =M u1 +M u2 The present invention starts from the bearing mode of a large-diameter single pile and the failure mode of the soil around the pile, comprehensively considers the horizontal soil resistance and the additional resistance contribution of the large-diameter single pile base, and the calculation results are accurate and reliable.

The invention discloses an agricultural machinery soil operation resistance monitoring device and monitoring method based on penetration angle and depth measurement, and belongs to the technical field of agricultural machinery equipment. The device is composed of a moving module, an operation machine tool module, an angle and depth detection module, a horizontal force measurement module and an integrated control module; the operation machine tool module is connected to the rear end of the moving module in a hung mode, the angle and depth monitoring module is installed on the operation machine tool module, and the horizontal force measuring module is installed between the moving module and the operation machine tool module. Compared with other soil resistance testing devices, the soil resistance testing device has the advantages that the function relation between the soil resistance and the soil penetration angle and the soil penetration depth is obtained during indoor testing, and then the soil resistance can be calculated by directly substituting the soil penetration angle and the soil penetration depth into the function relation during field operation. By monitoring the soil resistance in real time, the digging penetration angle and depth can be dynamically adjusted, overload or insufficient power is avoided, the crop damage rate is reduced, and mechanical equipment is protected from being damaged by sudden change resistance.