489 results about "Contact pressure" patented technology

The invention discloses a while-drilling intelligent rock drill and method for self-calibrating a tunnel blast hole drilling track, and the while-drilling intelligent rock drill comprises a rock drill main body, a drill rod, a drill bit, an air leg, a monitoring module, an execution module and a control module, the monitoring module is used for receiving and collecting real-time data such as the drilling depth, the drill bit posture, the linear speed, the angular speed and the contact pressure of a drill bit and a rock stratum in real time and transmitting the data to the control module. The control module is used for receiving data of the monitoring module in real time, drawing an actual drilling track of a drill hole, calculating a drill hole deviation with a preset track, predicting lithology change in combination with an LSTM deep learning model, and outputting a correction instruction to the execution module; and the execution module dynamically adjusts the drilling deviation according to the received correction instruction. The method is realized based on the intelligent rock drill while drilling. The system has the advantages that the system has good real-time deviation monitoring and automatic calibration capabilities, the drilling precision can be effectively improved, and the problem of drilling deviation caused by lithology changes and personal errors is avoided.

The invention discloses a plastic pipe crack positioning method, which belongs to the technical field of nondestructive inspection, and comprises the following steps: constructing a pipe three-dimensional coordinate system, setting a three-dimensional contour scanning method, generating an effective point cloud, calculating the surface curvature of the effective point cloud, planning a detection path, generating an optimal detection path, and avoiding mechanical collision between a probe and a pipe structure. The optimal detection path is converted into a control signal, a pressure control method is set, the pre-tightening force of the position to be detected is calculated, pressure compensation is carried out on the hardened abnormal surface, so that the thin-walled tube is prevented from being damaged by pressure or the hard surface is prevented from being scratched, and the contact pressure is dynamically adjusted; transmitting sound waves to the to-be-detected position, setting a crack positioning method, performing crack detection, judging whether the to-be-detected position has defects or not, calculating a crack confidence coefficient, setting a threshold value to judge a true crack, setting a crack evaluation method, calculating a risk score of the crack, and generating a three-dimensional network model of the pipe. And the precision, efficiency and safety of plastic pipe detection are improved.

The invention discloses a TBM hob three-way rock breaking force prediction method and system based on a rotary cutting mode, and the method comprises the steps: building a hyperbolic function model of the cutting edge width and penetration depth of a hob, and optimizing the geometric structure of the hob to adapt to different rock stratums; an effective contact radius and a contact angle are calculated through a coupling motion trail equation of revolution and rotation of the hob; fitting a pressure distribution coefficient in combination with pre-test data, constructing a Hertz-Weibull stress coupling analysis model, and accurately representing stress distribution in the cutting direction and the radial direction; on the basis of contact pressure integration and stress decomposition, respectively deriving explicit calculation formulas of vertical, rolling and lateral rock breaking forces, and dynamically adjusting the rotating speed of the cutterhead, the propelling pressure and the hob spacing according to a rock breaking force prediction result. According to the method, the rock breaking force prediction precision in the complex rock stratum is remarkably improved, the TBM construction efficiency and the cutter service life are optimized, the over-excavation risk and energy consumption are reduced, and the method is suitable for intelligent tunneling control of tunnel engineering.

The invention provides a pipe jacking construction pushing frictional resistance prediction method considering on-way loss of a drag reducer, and relates to the technical field of constructional engineering. The method comprises the following steps: judging a pipe-soil slurry contact state; calculating the pipe-soil contact pressure; calculating the pipe-soil frictional resistance according to the pipe-soil contact pressure and the contact width; obtaining the initial thickness of the slurry sleeve and calculating the pressure drop ratio per unit length of slurry; according to the pressure drop ratio and the initial thickness of the slurry sleeve, the thickness of the slurry sleeve changed along the way in the pushing process is calculated; calculating pipe slurry sliding frictional resistance according to the thickness of the slurry sleeve; according to the pipe soil frictional resistance, the pipe slurry sliding frictional resistance, the pipeline radius and the contact width, the pushing frictional resistance is calculated; and if the predicted pushing frictional resistance exceeds an expected value, the grouting pressure is corrected. According to the method, on-way changes of drag reducer pressure and drag reducer thickness in pipe jacking construction are considered, a unit length pipe joint three-dimensional frictional resistance calculation formula considering longitudinal drag reduction attenuation is established, and compared with actual measurement results, the error of the method is only 3% and is far lower than that of a traditional means.

The invention discloses an intelligent laser cutting device for a cabinet plate of a switch cabinet, and relates to the technical field of laser cutting. Due to the fact that the thickness of a cabinet door plate is small, when the cabinet door plate is positioned and clamped, the clamping position of the plate is warped due to clamping pressure, the planeness of the plate is affected after warpage, and the edge of the cut plate is bent, the bottom of the plate is supported through cooperation of an angle pressing plate and a bottom supporting plate and cooperation of the bottom supporting plate and a supporting mechanism when the plate is positioned; meanwhile, through contact pressure between the cambered surface of the corner pressing plate and the top of the plate, the corner pressing plate slides and moves upwards under the limitation of the sliding column, the rubber cushion block deforms to generate elastic force, the elastic force is transmitted to the clamping corner of the top of the plate through the corner pressing plate, clamping compression deformation of the corner of the plate is limited during clamping and positioning, warping of the plate is avoided, and the machining precision of the plate is improved. And meanwhile, the flatness of the plate is affected after warping, and the edge of the cut plate is bent.

The invention discloses a compression type external casing packer based on petroleum low-carbon exploitation, and relates to the technical field of oil field downhole tools, the compression type external casing packer comprises a casing pipe, a micro-deformation adjusting mechanism is arranged in the casing pipe, and when the packer is in the installation process, the micro-deformation adjusting mechanism is in a contraction state so as to guarantee that the packer can be smoothly put into the casing pipe; according to the device, the rubber sleeve assembly adopts a multi-section combined design and is formed by sequentially connecting at least three cylindrical rubber sleeves in series in the axial direction, the multiple sections of cylindrical rubber sleeves can achieve differential adaptation through cooperative deformation, aiming at the local diameter expanding section of the inner wall of the sleeve, the rubber sleeves at the corresponding positions can more sufficiently expand in the radial direction to fill gaps, and the sealing performance of the sleeve is improved. The expansion amount of a local reducing section can be properly controlled to avoid excessive extrusion, meanwhile, the contact area of the multiple sections of rubber barrels and the inner wall of the sleeve is larger, the contact pressure of the sealing face can be effectively dispersed, and a uniform and stable sealing pressure field is formed in the whole well section.

The invention discloses automatic welding equipment for iron accessories of an electric iron tower, and relates to the technical field of welding equipment. When transmission of wires needed by welding is blocked, errors occur between the conveying speed of the wires and the welding speed, and consequently welding work cannot be carried out normally, the outer diameter change of the rotary column is matched with the width change of the through groove of the side groove plate, the wires are concentrated in the center area to be guided out, the process of guiding the wires into a welding gun is smoother, and the welding efficiency is improved. Meanwhile, by means of the change of the outer diameter of the rotary column, when the wire deviates, the large outer diameters on the two sides limit deformation of the rubber barrel, increase contact pressure between the rubber barrel and the wire, increase friction force and provide larger power for transmission of the wire, and when the rotary column is matched with the side groove plate, when the wire deviates, transmission acting force is increased, so that the wire is smoothly guided and conveyed, and the service life of the wire is prolonged. And the situation that welding cannot be conducted due to the fact that conveying of the wire is blocked when the wire deviates is avoided.

The utility model discloses a butterfly valve with an elastic butterfly plate, relates to the technical field of butterfly valves, and solves the problems of abrasion, jamming, poor durability and the like in the prior art. The whole butterfly plate is in a plate sheet shape and is made of an elastic metal material, the butterfly plate comprises an inner disc part located in the center and a contact part located on the periphery of the inner disc part, the section of the contact part is in a bent shape, and the outline trend of the contact part is that the contact part is gradually away from the valve rod firstly and then bent inwards to approach the valve rod; and the valve seat is in sealing fit with the contact part. A plate-shaped butterfly plate structure integrally formed by an elastic metal material is adopted, and the contact part of the butterfly plate generates radial expansion deformation during closing through the elasticity of the material, so that a sealing surface gap caused by machining errors, thermal expansion and medium impurities is adaptively compensated, and the dependence on the assembly precision is remarkably reduced; the section of the contact part adopts a bent profile which firstly gets away from the valve rod and then gets close to the valve rod, the elastic deformation capacity is enhanced, and the contact pressure of the sealing surface can be gradually enhanced in the rotating closing process of the butterfly plate.

The invention discloses a grinding and polishing removal error compensation control method considering the dynamic error of a robot, and the method achieves the prediction of the grinding and polishing removal depth through the building of a grinding and polishing removal depth prediction model considering the dynamic error of the robot, and solves the problem of non-linear distribution of the contact pressure and relative sliding speed of a side edge during the machining of the side edge. The limitation of a traditional Hertz model in narrow space side blade contact mechanical modeling is broken through, and accurate prediction of the grinding and polishing removal amount and the surface appearance is achieved; and then an offline-online collaborative layered compensation mechanism is provided, a space-time transmission mechanism of robot errors under time-varying dynamics is identified, accurate tracking of a deterministic grinding and polishing trajectory is achieved, and the grinding and polishing contour precision of the whole component is improved.

The invention relates to a quasi-static straight gear wear numerical analysis method, and belongs to the technical field of mechanical engineering. The method comprises the following steps: calculating a dynamic wear coefficient by using a mixed lubrication model; the contact pressure and the sliding distance are calculated in an integral form, a straight gear quasi-static numerical wear model is established by using matlab software with the help of an Archard formula, and a wear value is calculated; the influence rule of the modulus, the torque and the tooth width on the abrasion loss is obtained, and meanwhile the significance of the influence of the three factors is analyzed through an orthogonal experiment method. Compared with the prior art, the method has the advantages that the problem that the calculation of the contact pressure is greatly influenced by the grid units is researched and solved, so that the obtained contact pressure value is more accurate, and the tooth surface wear is reduced according to the rule and significance analysis of the influence of various factors.

The invention discloses a uniformity removal trajectory planning method and system suitable for flexible grinding and polishing machining, and the method comprises the steps: S100, building a material removal depth model and a material removal profile at a grinding and polishing point after a flexible grinding and polishing contact wheel is in contact with a workpiece according to the contact pressure in a flexible grinding and polishing profile contact region; s200, correcting the material removal depth model by considering the variable quantity of the chord height error caused by the compliant contact deformation to obtain a corrected material removal depth model; and S300, based on the corrected material removal depth model, the material removal profile is fused into the corrected material removal depth model to realize uniformity removal trajectory planning considering material removal characteristics, and a processing trajectory sequence containing attitude information is obtained. According to the method, equal chord height error step length calculation of contact deformation and equal residual height line spacing calculation of uniform material removal are considered, so that uniform removal trajectory planning of smooth grinding and polishing is realized, and the problem of trajectory discontinuity caused by elastic deformation is remarkably reduced.

The intelligent sensing and pressure self-adaption support pile system comprises a plurality of support pile bodies, a sensor network, a hydraulic servo adjusting system and an intelligent control unit. The support pile body is of a conventional foundation pit support pile structure, is prefabricated by reinforced concrete or is formed by cast-in-place, provides a basic support function and resists soil pressure; the sensor network is embedded into the support pile body and monitors the strain condition of each pile body in real time; the intelligent control unit calculates support parameters according to monitoring data of the sensor network and outputs a control instruction; and the hydraulic servo adjusting system automatically adjusts the contact pressure between the pile and the soil according to the control instruction. The system can monitor the stress state of a pile body in real time and automatically adjust supporting parameters through the hydraulic servo system, so that the safety and reliability of foundation pit engineering are remarkably improved.

The invention relates to equipment and a method for testing interference friction force and hydraulic locking force of a composite roller, and belongs to the technical field of composite roller testing. The testing equipment comprises a shaft core and an inner supporting expansion mechanism, the shaft core is hollow and is provided with shaft core sections with different diameters and is hollowed out, the inner supporting expansion mechanism comprises a lead screw, a plurality of outer supporting strips and a connecting rod supporting structure connected with the outer supporting strips and the lead screw, and the lead screw drives the outer supporting strips to move in the radial direction to be in interference fit with a roll collar to be tested. A first pressure sensor is arranged to measure contact pressure, and a second pressure sensor is arranged to measure locking force applied to a plurality of positions. According to the invention, the interference magnitude is accurately controlled and pressure data is collected through the inner support expansion mechanism, the interference friction force and hydraulic locking force transmission effect of the composite roller under different interference magnitudes can be accurately detected, and reliable test data is provided for the design of the composite roller.

The invention relates to the technical field of bearings, in particular to a comprehensive evaluation method and system for the sealing performance of a deep groove ball bearing. According to the method, the actual working state of the deep groove ball bearing is obtained through the dynamic contact half width and the contact stress, the health condition of a sealing part can be reflected more accurately, and the dynamic characteristics of the sealing change in the working process of the bearing can be captured in time by measuring the total contact pressure and the contact stress in real time; by monitoring the pressure driving leakage rate and the centrifugal effect leakage rate of the contact area of the sealing lip and the bearing ring, the sealing performance can be evaluated more directly and accurately, and by monitoring the dynamic oil film thickness and the medium pressure difference of the contact area in real time to obtain the leakage rate, the sealing state can be reflected more accurately. By comprehensively considering various factors such as the pressure driving leakage rate and the centrifugal effect leakage rate, a more comprehensive sealing efficiency index can be obtained, and the accuracy and reliability of sealing performance evaluation are improved.

The invention relates to the technical field of metal casting sawing, and particularly discloses a sawing machine for metal casting machining, which comprises a supporting structure, a fixing device and a protective device, and the supporting structure can support the whole device to operate stably; the fixing device is arranged in one end of the top of the supporting structure, adopts a crossed fixing structure of double first fixing rods driven by a first hydraulic push rod and a second fixing rod driven by a second hydraulic push rod, and is matched with right-angle positioning formed by the supporting platform and a first supporting L-shaped plate; stable clamping can be formed for metal castings in different shapes such as a round shape, a rectangular shape and a special shape, and the limitation that a traditional sawing machine can only fix castings in a single form is effectively overcome; a first contact type pressure sensor is embedded in the first fixing rod, a second contact type pressure sensor is embedded in the second fixing rod, and the sensors are electrically connected with the corresponding hydraulic push rods respectively, so that the contact pressure of the fixing rods and the casting can be detected in real time, and the fixing force of the hydraulic push rods is adaptively adjusted.

The invention discloses metal barrel welding equipment for filter machining, and relates to the technical field of welding equipment. According to the metal barrel welding equipment for filter processing, due to the fact that a barrel is formed by rolling a plate, but the plate has deformation stress, a gap exists in the welding position of the rolled barrel, and therefore the phenomenon of pseudo soldering is likely to occur in the gap position welding process in the welding process; when the welding gun is close to the welding position of the barrel, the ball head is in contact with the two sides of the welding position of the barrel, the contact pressure between the ball head and the barrel is matched with the characteristic that the ends, away from the side sliding blocks, of the connecting rods are close to each other, the two sides of the welding position of the barrel are pressed, it is guaranteed that the welding position of the barrel is tightly attached, and the phenomenon that a plate for rolling the barrel rebounds is avoided. A gap is formed in the welding position of the barrel, insufficient welding occurs in the gap during welding, and the welding effect of the barrel is affected.

The purpose of the present invention is to enable easy connection work while obtaining high connection reliability between a pin terminal and a socket terminal. This socket terminal is connected to a pin terminal, and is provided with: a cylindrical part having a cylindrical base part and a plurality of spring contact pieces arranged in the circumferential direction of the cylindrical base part; and an urging member externally fitted to the cylindrical portion, each of the plurality of spring contact pieces extending from the cylindrical base portion in the axial direction of the cylindrical base portion and being elastically deformable in the radial direction of the cylindrical base portion, the urging member urging each of the plurality of spring contact pieces toward the inner circumferential side, and applying a contact pressure from each of the plurality of spring contact pieces against the pin terminal, the urging member urging each of the plurality of spring contact pieces being elastically deformable in the radial direction of the cylindrical base portion. The biasing member is made of a shape memory alloy that memorizes the shape so that the contact pressure is increased by temperature rise.

The invention relates to the technical field of grinding equipment, in particular to a double-sided grinding machine planetary gear train multi-station positioning mechanism which comprises a rack, a grinding table arranged above the rack and a sealing cover installed through a lifting mechanism and further comprises a sun gear and an outer gear ring which are concentrically distributed on the surface of the grinding table, and the sun gear is connected with a driving mechanism; an annular grinding disc arranged between the sun gear and the outer gear ring and a grinding disc arranged on the sealing cover form a closed grinding cavity; and the workpiece mounting mechanisms are arranged in the closed grinding cavity. By means of the spring and the sliding block linkage mechanism arranged in the planetary gear, the clamp can form floating clamping force in the radial direction and the axial direction. When abrasive dust accumulation on the two sides of the workpiece is not uniform, the vertical sliding block achieves axial displacement through elastic compensation of the first spring, the horizontal sliding block adjusts radial clamping force through the second spring, and it is guaranteed that the workpiece always keeps uniform contact pressure with the upper grinding disc and the lower grinding disc.

The invention relates to the field of power equipment installation, and discloses a special transformer intelligent fusion terminal guide rail modular installation system and method.The method comprises the steps that the installation state of an intelligent fusion terminal body is dynamically sensed, and an initial constraint model of the installation direction is generated in combination with an attitude angle detection result; performing direction deviation detection on the initial constraint model, and calculating attitude offsets in the longitudinal and transverse directions; the expansion module is pushed into the standard interface of the terminal body along the guide rail direction, and the propulsion angle and the contact pressure are monitored in real time in the plugging process; when it is detected that the propelling angle deviates from the preset range and changes abnormally along with the contact pressure, whether propelling angle adjustment is associated with pressure distribution correction or not is judged, and if the pressure cannot be recovered to be normal after angle adjustment, a pressure auxiliary adjustment strategy is synchronously started in the propelling angle correction process; after the propelling angle and the contact pressure return to the balance state again, self-adaptive propelling stability control is executed; the method has the advantage that the installation and maintenance efficiency is improved.

The invention discloses a response test method and device for soil layer deformation and tunnel stress in foundation pit excavation, and relates to the technical field of underground engineering tests. The method comprises the following steps: acquiring engineering geology and tunnel structure parameters, and constructing a geological tunnel coupling similarity model embedded with a layered sensing array; step-by-step excavation is adopted to simulate foundation pit construction, and soil layer displacement strain, tunnel stress contact pressure and excavation disturbance parameters are synchronously collected through multiple channels; constructing a deformation stress coupling prediction model and an excavation disturbance quantification model; and constructing a dynamic coupling response model based on the two, and outputting a dynamic coupling curve of soil layer deformation and tunnel stress. The device comprises a model box body, a data processing host and a display terminal, a layered sensing array, a dynamic loading device, a servo excavation mechanism and a multi-channel data acquisition instrument are arranged in the box body, and the whole test process integrated operation can be realized. According to the method, the dynamic coupling rule can be accurately captured, and technical support is provided for safety assessment and parameter optimization of underground engineering construction.

The invention discloses a design and calculation method for mechanical seal end face specific pressure. The method comprises the steps that material parameters, end face morphology parameters, structural parameters and working condition parameters of dynamic and static rings of a mechanical seal are obtained; determining the maximum height and the initial porosity of the contact interface gap of the moving and static rings; determining the compression amount of a sealing interface; determining the deformation state of the sealing interface; determining a first end surface specific pressure of the sealing interface under a non-percolation critical contact condition; the second end face specific pressure of the sealing interface is determined; and according to the first end face specific pressure and the second end face specific pressure, the design range of the mechanical seal end face specific pressure is determined. By means of the method, the defect that only empirical values are relied on when mechanical sealing end face specific pressure parameters are designed in the prior art can be overcome, it can be ensured that the selected end face contact pressure is more scientific and reasonable, it can be ensured that the mechanical sealing end face does not leak, meanwhile, the wear rate of the mechanical sealing end face does not exceed the standard, and the service life is prolonged. Important guarantee is provided for zero-leakage and long-service-life operation of the mechanical sealing device.

The invention relates to the technical field of automatic control, and discloses a pressure-sensing precision mechanical part polishing brush system and method.The system comprises a multi-mode pressure sensing module, an elastic feedback execution module, a self-adaptive trajectory planning module and a closed-loop quality control module; establishing a contact pressure distribution model and analyzing pressure balance, and generating local and global pressure compensation instructions according to the pressure balance; an elastic feedback mechanism is driven to dynamically adjust the axial pressure of the brush, and meanwhile, a self-adaptive polishing path containing a pressure compensation weight is planned by combining the morphology data; the feeding speed and the rotating angle are cooperatively adjusted in the polishing process, and precise machining of the complex curved surface is achieved; and finally, the surface roughness is detected through an optical sensor, and technological parameters are optimized in a closed-loop mode. The problems of surface scratches and contour distortion caused by uneven pressure distribution are solved, and the machining quality and consistency of precision parts are improved.

The invention provides a sliding bearing oil film thickness obtaining method and device, and the method comprises the steps: building a micro-contact roughness model of a sliding bearing, and obtaining the contact pressure and contact area of a shaft of the bearing and a bearing bush rough peak according to the micro-contact roughness model; establishing a wear model of the sliding bearing, and obtaining the wear depth hw of the sliding bearing according to the wear model, the contact pressure and the contact area; obtaining the elastic deformation hE of the sliding bearing; according to the included angle between the axis of the sliding bearing journal and the center line of the bearing and the included angle between the circle center connecting line of the front and rear end faces of the journal and the center connecting line of the bearing and the journal, the journal inclination h '0 is obtained; and obtaining the thickness h of the oil film of the sliding bearing according to hw, he and h '0. According to the method, the influence of factors such as abrasion, elastic deformation and journal inclination in the working process of the bearing on the oil film thickness is fully considered, the oil film thickness of the sliding bearing can be accurately calculated and monitored, a theoretical basis is provided for design of the sliding bearing, and reliable operation of the bearing is guaranteed.

The photovoltaic installation support comprises a support body, a traction chain and a balance weight part, a base is hinged to the lower end of the support body, a plurality of electromagnets are evenly embedded and fixedly connected to the top of an inner cavity of the base, and a rapid fixing part is installed in an inner cavity of the balance weight part. Contact pressure between the base and the base floor is detected through the pressure sensor, when the pressure value reaches a preset value, it is indicated that the base and the base floor are firmly installed, real-time monitoring is conducted, an operator is helped to judge whether the base is stably installed or not, and a driving motor is manually rotated to be in transmission fit through a worm and a worm wheel; therefore, the base is pulled to adjust the inclination angle of the base, it is ensured that the base is attached to the slope surface of the base layer ground, and the problem that a traditional support is difficult to fix to an abrupt slope is solved.

The invention discloses a method for evaluating the sealing performance of a pipe joint, and the method avoids the defect that the visual inspection of tiny seepage is easy to omit through building the relation between a leakage rate value and an actual leakage phenomenon. Based on a numerical calculation method, the time period and the cost waste of physical verification are saved, the sealing performance can be pre-judged during product design by adopting the method, and the stress index and the sealing contact width index of main structure parameter design are reversely solved according to the sealing performance index; and traceability can be carried out when a leakage fault is sent, a weak link of contact pressure is found, and guidance is brought to improvement of sealing performance.

The invention discloses a novel adhesive tape machine and a guide chute. Comprising a guide chute frame arranged corresponding to the sealing-tape machine; a plurality of guide rods are vertically arranged on the guide chute frame corresponding to the two sides of the sealing-tape machine; the lower section of each guide rod is sleeved with a contact baffle frame. An adjusting spring is arranged on the guide rod above each contact baffle frame in a sleeving manner; and each contact baffle frame is provided with a contact baffle. The contact surface of the contact baffle and the adhesive tape machine can automatically adjust the contact pressure according to the running state of the adhesive tape and the impact of materials, and the requirements for preventing the materials from overflowing and reducing the friction resistance are effectively met.

The invention provides a wind power gear box sliding bearing lubrication contact risk analysis method, which comprises the following steps: screening out a key working condition from a plurality of wind power working conditions, and obtaining an envelope sampling load spectrum containing a plurality of load grades in combination with the key working condition; constructing a wind turbine generator transmission chain multi-flexible dynamic model; the envelope sampling load spectrum containing the multiple load grades serves as an input load of the transmission chain multi-flexible-body dynamic model, the transmission chain multi-flexible-body dynamic model is solved, and the sliding bearing contact pressure and the sliding bearing contact time are obtained; and calculating the lubricating contact risk of the planet gear sliding bearing according to the sliding bearing contact pressure and the sliding bearing contact time. According to the method, the wind power working condition calculation number can be greatly reduced, key core working conditions can be rapidly identified and extracted, and the effect similar to full working condition simulation can be rapidly achieved; the method can effectively represent the potential contact risk of the sliding bearing under different working conditions, and is suitable for rapidly evaluating the influence of the working condition change on the lubricating contact of the sliding bearing of the wind generating set transmission chain.

The invention discloses a deep foundation pit engineering measurement device and method, and relates to the technical field of foundation pit engineering measurement. The deep foundation pit engineering measuring device comprises a rope and a measuring body, the measuring body comprises a shell, and the diameter of the shell is smaller than that of a measuring drill hole; the sleeve is rotationally arranged in the shell, and the inner diameter of the sleeve is larger than the outer diameter of the rope, so that the rope can penetrate through the sleeve. Through a cooperative structure of the shell, the sleeve and the counterweight base, compact layout of the measurement main body is realized, the risk of collision with a measurement drill hole is reduced, the device is ensured to be stably lowered and measured in a loose soil body or a drill hole containing an obstacle, and through the design of the outer support assembly, different aperture requirements are adapted, one-key unfolding and folding are realized, and the measurement precision is improved. The loading and unloading difficulty during device measurement is reduced, precise pressure control is achieved through servo motor driving, insufficient or overload of probe contact pressure is avoided, and the stability of measured data is guaranteed through arrangement of a stabilizing assembly.

The utility model relates to the technical field of inner hole grinding of metal parts, and discloses an inner hole finishing and grinding mechanism and a grinding machine for metal parts, the inner hole finishing and grinding mechanism comprises an eccentric grinding roller, an eccentric disc and a gear rack linear module, the eccentric grinding roller is driven by a grinding motor to rotate to grind and finish the inner wall surface of a metal sleeve; the eccentric disc is driven by a rotating shaft which is located on the same central axis with the metal sleeve to rotate, and the rotating shaft is driven by a rotary motor to rotate; a mounting seat is arranged on a movable sliding table of the gear rack linear module, the rotary motor is fixed on the mounting seat, and the rotating shaft is rotationally arranged on the mounting seat; and the eccentric grinding roller is driven by the rotary motor to do circular motion back and forth close to the inner wall face of the metal sleeve so as to trim and grind the inner wall face of the metal sleeve. The device can keep the contact pressure between the eccentric polishing roller and the inner wall of the metal sleeve stable, and improves the polishing effect.

The present invention discloses an analysis and calculation method and device for the jacking force of vertical curve pipe jacking. The calculation result is more accurate, reducing the dependence on empirical values; it supplements the calculation of the jacking force for small-diameter and small-axis-radius curve pipe jacking; it can realize the real-time adjustment of the jacking force calculation, providing a reference for intelligent and automated construction; when the axis radius is small, there is no value for the additional friction coefficient in the existing specifications. Compared with the calculation in the existing specifications, the method of partial contact between the pipe and the soil is used to calculate the jacking force, starting from the machine head as the analysis starting point, weakening the error of different earth pressure calculation methods on the calculation of the jacking force of curve pipe jacking. The empirical parameters are few and the value range is small, making the calculation result closer to the actual situation. The main parameters of this calculation method are the earth pressure of the machine head and the contact pressure between the pipe and the slurry, and these two data can be transmitted in real time through the setting of stress gauge sensors to realize the automatic adjustment of the jacking force calculation.