1911 results about "Mechanism (engineering)" patented technology

The invention provides a multi-dimensional supporting leg structure for lightweight steel ring splicing equipment, and relates to the field of tunnel engineering. The mounting base is fixedly connected with the frame, the telescopic driving mechanism is arranged between the mounting base and the supporting leg assembly, the angle adjusting mechanism is arranged between the cylinder barrel and the mounting base, and the self-locking mechanism is used for locking the cylinder barrel and the piston rod when the driving unit fails. The telescopic driving mechanism is composed of a cylinder barrel, a piston rod and a driving unit, the angle adjusting mechanism is driven through a first rotating shaft and a second rotating shaft which are perpendicular to each other and corresponding rotation, so that the cylinder barrel achieves double-shaft swing adjustment, the self-locking mechanism is composed of a locking rack, a movable tooth claw, a reset spring, an electromagnet and a permanent magnet, and power-on unlocking and power-off self-locking are achieved. According to the structure, the supporting polygon is obviously enlarged under the complex basic condition, the anti-overturning stability of equipment is improved, reliable supporting is kept when a hydraulic system fails, and the safety and adaptability of steel ring splicing operation in a tunnel are improved.

The invention provides an auxiliary device for steel pipe construction welding, and relates to the technical field of pipeline welding, and the auxiliary device comprises two arc-shaped bearing bodies, an auxiliary main frame, an aligning mechanism and a rotary driving system. The central angle of the arc-shaped bearing body is larger than 180 degrees, automatic centering of the steel pipes is achieved through the outer pressing supporting rod assembly and the inner positioning supporting rod assembly, and it is guaranteed that the two sections of steel pipes are concentric. And the welding head mounting seat is connected with the rotary driving piece through the arc-shaped movable clamping body to drive the welding head to continuously rotate around a welding seam, so that high-quality girth welding is completed. The device solves the problems of low centering precision and poor efficiency in traditional welding, has the advantages of high automation degree, high stability, convenience in assembly and disassembly and the like, and is suitable for quick welding of municipal steel pipe engineering.

The invention relates to the technical field of tensile tests, and discloses a building sealant stretching performance test device, which comprises a test box, a first clamp, a loading block, a linear driver and a driving mechanism, a door plate is mounted on the front of the test box; the first clamp is installed at the top in the test box, the loading block is arranged in the test box, located below the first clamp and driven by the linear driver to move up and down, a through loading channel is formed in the loading block, and a cylinder is arranged in the loading channel and driven by the driving mechanism to rotate; a through assembly channel is formed in the cylinder body, and a transversely-arranged guide rail body is installed in the assembly channel. According to the invention, by carrying out stretching, torsion, inclined stretching, tearing stretching, winding stretching and testing in a low-pressure environment on the sealant, the mechanical properties of the sealant under complex working conditions can be comprehensively evaluated, the testing precision and reliability are improved, the actual engineering requirements are met, and meanwhile, the testing safety and environmental protection property are ensured.

The invention provides an EMB sensorless clamping force estimation method based on multi-signal fusion and displacement compensation, and belongs to the technical field of vehicle braking, and the method comprises the steps: carrying out the modeling of an EMB system mechanical model; on the basis of the EMB system mechanical model established in the step S110, executing clamping force estimation; on the basis of the EMB system mechanical model established in the step S110, current-position information fusion is adopted to execute contact point detection; on the basis of the contact point detection result in the step S130, performing contact point detection position error compensation; on the basis of S140 position error compensation, a return stroke backlash compensation mechanism is introduced, the mechanical transmission gap error is further corrected, and the clamping force estimation precision is improved; and executing clamping force control scheme design based on the results of the steps. According to the method, a good clamping force estimation effect can be achieved, the system reliability is remarkably improved while the cost is reduced, and the method has good engineering application value.

The invention discloses a permanent magnet synchronous motor joint simulation method, which comprises the following steps of: firstly, establishing a permanent magnet synchronous motor finite element model in Maxwell, and defining material nonlinear characteristics and motion boundary conditions; a motor drive control circuit is constructed in Simplorer, the finite element model is imported through a Twinbuild tool, and an electromagnetic-circuit joint simulation environment is established; creating a motor multi-body dynamic model and an external load model in Adams, and respectively exporting the motor multi-body dynamic model and the external load model into an FMU format and an Adamssub format; and finally, establishing an electromagnetic-circuit-mechanism joint simulation platform in the Simulink, and executing joint simulation. Compared with traditional joint simulation, according to the method, through electromagnetic-circuit-mechanism three-field real-time interaction, the motor can sense the load sudden change working condition, then the torque and current of the motor are rapidly adjusted through the PI controller, the problems that in engineering practice, the external load of the motor is not real, and the abnormal load is detected are solved, and the reliability of the motor is improved. And the crossing from an ideal load to an actual load is realized.

The invention relates to the technical field of mechanical engineering, in particular to a reciprocating type vertical lifting device.Two stand columns are fixedly connected to the top of a rail car, ejector rods are fixedly connected to the tops of the stand columns, a dynamic lifting mechanism is fixedly connected to the side faces of the stand columns, and a fixed side plate is arranged in the middle of the dynamic lifting mechanism; winding drums are arranged on the side faces of the two sides of the fixing side plate, a bearing mechanism is arranged in the middles of the two stand columns, a bearing table is arranged in the middle of the bearing mechanism, a balance mechanism is arranged at the bottom of the bearing mechanism, a balance base is arranged in the middle of the balance mechanism, and a balancing weight fixing base is arranged at the bottom of the balance base; a deceleration block is arranged on the side face of the balance mechanism, capsizing moment generated by goods deviation and position is counteracted, the deviation problem of the bearing mechanism is solved, friction between the bearing mechanism and the stand column guide rail is reduced, the stress of the root of the stand column is reduced, and the maintenance period is prolonged.

The invention discloses a reamer electromechanical driving mechanism and method capable of detecting the position state of a blade, and relates to the technical field of tools of petroleum drilling engineering, the reamer electromechanical driving mechanism comprises a power assembly, a lead screw assembly, an ejector rod, a locking assembly, a rotation detector and a displacement detector which are mounted in a drill collar; the power assembly is connected with the lead screw assembly, the lead screw assembly is connected with the ejector rod, the ejector rod is connected with the reamer blade, the power assembly rotates and drives the ejector rod to move up and down through the lead screw assembly, and the ejector rod moves up and down to drive the reamer blade to be unfolded or folded. The locking assembly is assembled on the ejector rod, and after the reamer blade is unfolded in place, mechanical self-locking is conducted on the ejector rod. The rotation detector is assembled beside the lead screw assembly to detect rotation of the lead screw assembly, and the displacement detector is assembled beside the ejector rod to detect up-and-down movement of the ejector rod. The opening and closing state of the cutter wing is measured and uploaded through the rotating detector and the displacement detector, the cutter wing is expanded in place, the underground condition can be judged easily, and controllable multiple reaming is achieved.

The invention belongs to the technical field of mechanical engineering, particularly relates to a self-adaptive grabbing mechanical arm, and provides the following scheme aiming at the problems that a clamping mechanism with a fixed shape is difficult to effectively fit an irregular outline of an object, so that the contact area of grabbing points is small, the stress is non-uniform, and the grabbing is unstable easily, the self-adaptive grabbing mechanical arm comprises a base; the rotating table is movably connected to the upper part of the base; the lifting hydraulic cylinder is fixedly connected to the upper end face of the rotating table; the main arm beam is fixedly connected to the driving end of the lifting hydraulic cylinder; and the sliding seat slides on the main arm beam. According to the self-adaptive grabbing mechanical arm, through the self-adaptive grabbing module, the self-adaptive grabbing mechanical arm can be bent in a self-adaptive mode to be attached to object contours of different shapes and sizes, a grabbed object is tightly wrapped in cooperation with the clamping air bag piece which is inflated and expanded, and flexible and stable grabbing of a target object with the complex outer surface is achieved; and the grabbing adaptability and convenience are remarkably improved.

The invention discloses an automatic system for brake spring force detection, which relates to the technical field of mechanical engineering and automatic control, and is characterized in that a multi-physics field coupling measurement module adopts a nested force sensor group (a strain gauge and piezoelectric quartz compound) and non-contact displacement measurement, and is combined with a thermal expansion compensation ring to correct temperature influence in real time; the environmental interference suppression module eliminates electromagnetic and thermal interference through an electromagnetic shielding cavity and a temperature control platform; the dynamic error compensation engine realizes drift prediction and physical field fusion by using six-dimensional attitude sensing and edge calculation (LSTM + GPR double-stage model); the self-calibration executing mechanism completes nanoscale positioning and micro-force control based on air flotation driving and the bionic clamping jaw. The method solves the problem of measurement misalignment caused by environmental interference, material thermal deformation and clamping errors in traditional detection, and is suitable for high-precision spring force detection under complex working conditions.

The invention belongs to the technical field of engineering hydraulic oil cylinders, and particularly relates to a hydraulic oil cylinder with a filtering mechanism for reducing pollutant accumulation. An air inlet pipe is directly connected with an external cold air source, cold air can be directly diffused in a device box and wraps a hydraulic oil cylinder body, and meanwhile a motor drives fan blades to rotate through a third rotating shaft; according to the oil cylinder cooling device, flowing of cold air in the device box body can be accelerated, the heat dissipation effect of the oil cylinder can be enhanced, heat accumulation caused by local retention of the cold air can be avoided, meanwhile, suspended dust generated by cleaning of the cleaning brush, small impurities which are not settled in the cold air and falling objects in the using process of the cleaning brush can be sucked, and the cleaning effect is improved. And the cleaning rod rotates under the rotation of the third rotating shaft, so that the impurities blocked by the second filter screen are cleaned, and the impurities enter a first collecting box through a connecting pipe.

The invention relates to the technical field of electric power engineering, in particular to a simulation method of a power station motor high-oil-pressure jacking hydraulic system, which comprises the following steps: building a high-oil-pressure jacking hydraulic simulation system which comprises a control module, a constant-pressure variable pump, a pressure release valve, a measuring element, an oil tank, an equivalent load, an equivalent hydraulic cylinder and a pressure release hole; the equivalent hydraulic cylinder is used for jacking up the equivalent load and simulating a real scene that the motor is jacked up by high-pressure oil; theoretical modeling is conducted on a frame and all parts of the high-oil-pressure jacking hydraulic simulation system; by establishing a linkage mechanism of the equivalent area, the pressure and the flow of the pressure relief hole, pressure fluctuation and compensation response during working condition conversion are accurately simulated; smooth transition between the static jacking state and the operation pressure maintaining state is achieved, and the stability and the self-adaptive capacity of the system under the variable rotating speed condition are effectively verified. Compared with traditional static simulation, the whole process of the hydraulic and mechanical coupling effect in actual operation is reflected more comprehensively.

The invention discloses frame steel cutting equipment for construction engineering construction, and relates to the technical field of cutting. The frame steel cutting equipment for construction engineering construction comprises a machine body, a machining mechanism and a notch formed in the side of the top of the machine body, a feeding mechanism is installed in the middle of the top of the machine body, the machining mechanism comprises an I-shaped base body and a rectangular inner cavity, and a hydraulic cylinder is fixedly installed on the side of the top of the I-shaped base body; a connecting flat plate is fixedly connected to the telescopic end of the hydraulic cylinder, a servo motor is fixedly installed in the middle of the bottom of the connecting flat plate, a strip-shaped hole is formed in the side, close to the servo motor, of the surface of the I-shaped base body, a cutting disc is fixedly installed at the output end of the servo motor, and a cutting guide assembly is installed in the middle of the bottom of the I-shaped base body. The purpose of stable cutting is achieved, frame steel vibration is reduced, protection is conducted, the situation that splashing hurts people is not prone to occurring, and cutting is convenient, accurate, safe and reliable.

The invention discloses a drill rod lowering control method, system and equipment of a rotary drilling rig and a medium, and belongs to the technical field of engineering machinery control. The drill rod lowering control method of the rotary drilling rig comprises the steps that if a drill rod lowering instruction is received, an electric main hoisting mechanism is controlled to lower a telescopic drill rod to a target drill hole; the current lowering depth of the telescopic drill rod is determined; the difference value between the hole depth of the target drill hole and the current lowering depth is set as the to-be-lowered depth; if the to-be-lowered depth is larger than the depth threshold value, the current lowering speed of the telescopic drill rod is set according to the current bearing weight, the power head height, the current lowering depth and the length of the sub drill rod; and if the to-be-lowered depth is smaller than or equal to the depth threshold value, a motor of the electric main hoisting mechanism is controlled to output reverse torque, and the motor of the electric main hoisting mechanism is controlled to stop rotating when a preset condition is met. The lowering speed of the telescopic drill rod can be reasonably controlled, and the service life of the rotary drilling rig is prolonged.

The invention discloses an amorphous alloy motor operation efficiency monitoring method and system based on artificial intelligence, and relates to the technical field of electrical engineering, the system is composed of a plurality of functional modules, and the system comprises a multi-dimensional data acquisition module for acquiring motor operation multi-field coupling parameters, environment condition data and motor operation multi-field coupling parameters; comprise electrical coupling parameters, thermal coupling parameters and mechanical coupling parameters; the edge calculation module is used for preprocessing motor operation multi-field coupling parameters and environment working condition data, introducing multi-field coupling features and extracting multi-dimensional features and multi-sensor time sequence features; and the cloud artificial intelligence analysis module constructs a dynamic mapping model based on historical motor operation data by adopting an improved LSTM and Attention mechanism and fusing a Transform architecture, inputs multi-dimensional features into the dynamic mapping model, outputs an energy efficiency level, and fuses multi-sensor time sequence features by using a graph neural network based on the energy efficiency level.

The invention belongs to the technical field of metal material mechanical property research, and discloses a gear shot peening tooth surface residual stress calculation method and system.The method comprises the steps that a shot speed calculation model in the gear shot peening process is built, shot peening process analog simulation is carried out, and dynamic information of collision between shots and a tooth surface is output; the projectile speed is converted from a machine tool coordinate system to a local coordinate system; establishing a sprayed target plate model and a projectile model, dividing grids, and assembling the grid-divided projectile model and the sprayed target plate model to construct a random multi-shot finite element geometric model; and performing finite element simulation calculation on the random multi-shot finite element geometric model, and outputting residual stress distribution of the gear. According to the method, computational fluid mechanics and a discrete element method are coupled, a high-precision calculation model of the shot speed in the gear shot blasting process is constructed, the forming mechanism and distribution characteristics of the tooth surface residual stress in the actual shot blasting process are effectively reflected, and the method is good in economical efficiency, high in simulation precision, high in process executability and closer to engineering practice.

The utility model discloses a rotary excavating reamer for a cast-in-place pile, and particularly relates to the technical field of engineering reaming equipment. The rotary excavating reamer for the cast-in-place pile comprises a connecting shaft, a driving box is arranged at the bottom end of the connecting shaft, a base is fixedly connected to the bottom of the driving box, a conical drill bit used for rotary excavating of the cast-in-place pile is fixedly connected to the bottom of the base, a plurality of rotating discs are rotationally connected to the base, and a positioning block is fixedly connected to each rotating disc. A tool apron is movably connected to the positioning block, and a reaming tool is fixedly connected to the tool apron. And a plurality of transmission connecting pieces are arranged in the driving box, the transmission connecting pieces are movably connected with the positioning blocks, and a driving mechanism is arranged in the driving box and used for driving the transmission connecting pieces to rotate so as to drive the reaming cutter to achieve angle adjustment. The utility model solves the problems that the linkage property of the reamer is insufficient in the process of adjusting the hole diameter of a reaming hole, and the assembly efficiency of the reaming piece is low in the disassembly and assembly process.

The utility model relates to the technical field of highway engineering material detection, and discloses a highway engineering material detection device which comprises a main control machine body, the upper surface of the main control machine body is fixedly connected with a detection mechanism, an automatic sweeping mechanism is arranged above the main control machine body, and the automatic sweeping mechanism comprises a support. An electric telescopic rod is fixedly connected to the inner wall of the support, a movable frame is fixedly connected to the telescopic end of the electric telescopic rod, a double-shaft servo motor is fixedly connected to the inner wall of the movable frame, and two sliding frames are slidably connected into the movable frame. According to the highway engineering material detection device, through mutual cooperation of the main control machine body, the detection mechanism, the support, the electric telescopic rod, the moving frame, the double-shaft servo motor, the threaded rod, the sliding frame, the driving motor, the rotating rod and the sweeping rotating disc, a material with the strength to be detected can be placed in the detection mechanism, and the detection mechanism is matched with the main control machine body to detect the material; the electric telescopic rod can control the horizontal distance of the cleaning turntable relative to the upper and lower extrusion surfaces of the detection mechanism.

The invention discloses a maglev engineering vehicle, which relates to the technical field of maglev vehicles, and comprises a first suspension frame unit, a second suspension frame unit and a third suspension frame unit, fixed sliding tables are arranged between the first suspension frame unit and the second suspension frame unit and between the first suspension frame unit and the third suspension frame unit, and the fixed sliding tables are fixed to a vehicle body; the transverse stabilizing mechanism comprises a first hydraulic cylinder and a second hydraulic cylinder, when the transverse stabilizing mechanism passes through a bent road section, the first hydraulic cylinder and the second hydraulic cylinder are disconnected to relieve transverse constraint, and the second suspension frame unit and the movable sliding table on the corresponding side of the second suspension frame unit as well as the third suspension frame unit and the movable sliding table on the corresponding side of the third suspension frame unit can rotate around the rotating center of the fixed sliding table on the corresponding side. When passing through a straight road section, the first hydraulic cylinder communicates with the second hydraulic cylinder to achieve transverse constraint, and the rigidity between the vehicle body and the suspension frame unit is guaranteed. According to the maglev engineering vehicle, the curve passing capacity and the curve passing balance stability of the maglev engineering vehicle can be improved.

The invention discloses an intelligent construction assembly type steel beam column rigid connection joint, and relates to the technical field of constructional engineering structures. According to the technical scheme, the intelligent construction assembly type steel beam column rigid connection joint comprises a connection joint body, I-shaped steel is connected to the two sides of the connection joint body, guide shells are arranged on the two sides of the connection joint body, adjusting mechanisms are fixedly connected to the upper portions of the guide shells, and guide wheels are arranged on the lower portions of the adjusting mechanisms; the two sides of the guide wheel are fixedly connected with first transmission wheels, the first transmission wheels are in transmission connection with a transmission belt, the transmission belt is in transmission connection with a second transmission wheel, and the second transmission wheel is fixedly connected with a first gear. The second gear rotates to drive the third gear to move, the third gear rotates to drive the positioning plate to move, and then the positioning plate is automatically driven to press the two sides of the I-shaped steel in the process that the I-shaped steel gets close to the connecting joint, so that the two sides of the I-shaped steel are limited, and positioning of the I-shaped steel in the horizontal direction is achieved.

The application relates to the technical field of hydraulic engineering construction, in particular to a water conservancy engineering water intake tunnel construction device and method. The device comprises a support and further comprises a driving motor arranged on the lower side of the support, a water mill drill fixedly installed on the output shaft of the driving motor, and a driving mechanism arranged on the support, wherein the driving mechanism comprises a switching frame which is slidably sleeved on the support in the left-right direction. According to the application, after the water mill drill completes the punching work, the switching frame can move leftwards while the water mill drill moves rearward, thereby saving a large number of steps. According to the design of the clamping plates and the lever, when the front ends of the two clamping plates and the lever are inserted into the gap between the rock column and the hole wall, the rock column can be knocked off by knocking the lever, the rock column can be clamped by the two clamping plates, and the rock column can be taken out by moving the position of the whole device.

The invention relates to the technical field of control engineering, and discloses a swing suppression stability control method and system for a rotary clamping jaw mechanism, and the method comprises the steps: collecting a motor current and a motor rotation angle of a servo driver corresponding to the rotary clamping jaw mechanism; the actual driving torque of the rotary clamping jaw mechanism is calculated, the angular acceleration of the rotary clamping jaw mechanism is calculated, and a load self-adaptive dynamic model of the rotary clamping jaw mechanism is established; the swing angular displacement and the swing angular velocity of the rotary clamping jaw mechanism are analyzed; defining a feedback gain of the rotary clamping jaw mechanism to calculate a target compensation torque of the rotary clamping jaw mechanism; and converting the target compensation torque into a compensation current instruction of the rotary clamping jaw mechanism, generating a composite control current instruction of the compensation current instruction and a preset basic current instruction, and executing swing suppression stable control of the rotary clamping jaw mechanism. According to the invention, the stability and accuracy of swing suppression control of the rotary clamping jaw mechanism can be improved.

The invention relates to the technical field of engineering equipment, and discloses a guardrail breakdown van. Comprising a device body and a drilling rig mechanism, the top of the device body is provided with the drilling rig mechanism, one side of the drilling rig mechanism is provided with a crane, the top of the device body is fixedly connected with an oil-gas separator, and one side of the oil-gas separator is provided with a radiator. An original engine of an automobile is utilized, additional installation is not needed, normal walking of the automobile is guaranteed, energy is directly supplied to the drilling frame mechanism, the working efficiency is greatly improved, in the aspect of heat dissipation, the drilling frame mechanism adopts a double-rotation and double-transverse-movement mode, a base is flexible, and large-range transverse movement and 360-degree rotation can be achieved; the drilling mechanism and the piling mechanism are installed in an interchange mode, the turning step is reduced, the truck-mounted crane is telescopic and can hoist goods of 3 tons, the truck is stabilized during working, space is saved when the truck-mounted crane does not work, and convenience and high efficiency of first-aid repair operation are improved in an all-around mode.

The utility model provides a landing leg oil cylinder and a hydraulic auxiliary supporting system, and belongs to the technical field of heavy machinery, the landing leg oil cylinder comprises a telescopic oil cylinder and a landing leg base located at the bottom of the telescopic oil cylinder, and the landing leg base is used for supporting the telescopic oil cylinder; the travel switch is provided with a switch contact, and the switch contact protrudes towards the ground, so that the travel switch is in contact with the ground before the landing leg base is in contact with the ground, and the landing leg base has a complete ground contact state and a non-complete ground contact state; the manual adjusting mechanism is arranged on the supporting leg base; in a state of completely contacting with the ground, the telescopic oil cylinder normally stretches out and draws back; in the state that the supporting leg base is not in complete contact with the ground, the supporting leg base is adjusted to be in complete contact with the ground through the manual adjusting mechanism. The hydraulic supporting leg oil cylinder can effectively solve the problem that the supporting stability of the hydraulic supporting leg oil cylinder is insufficient in a complex environment, and ensures that the supporting leg oil cylinder can be reliably withdrawn when a hydraulic system breaks down, so that the safety and the emergency evacuation capacity of an engineering vehicle are improved.

This invention relates to the field of booms, and discloses a rotary drive mechanism, a boom, and engineering machinery. The rotary drive mechanism includes an annular piston (10) and a stator. The annular piston (10) is provided with piston teeth having protruding curved tooth surfaces and piston teeth having inclined flat tooth surfaces. The stator is provided with stator teeth having protruding curved tooth surfaces and stator teeth having inclined flat tooth surfaces. The annular piston (10) can be driven to move axially relative to the stator. Through the above-described technical solution, the combination of the meshing of curved tooth surfaces and the meshing of flat tooth surfaces can ensure smooth transmission in the initial meshing stage, reduce noise, and allow the subsequent meshing stage to convert axial movement into uniform rotation, providing a more stable torque output.

The invention is suitable for the technical field of engineering machinery safety control, and provides a forklift anti-rollover self-adaptive balance control system and method, and the system comprises a sensor group, a controller and an execution mechanism group. The sensor group detects vehicle body postures, cargo weight and road conditions; the controller automatically identifies working conditions such as flat ground, ramp and high-position stacking according to the data and calculates a safety coefficient; and the executing mechanism group comprises a vehicle body leveling mechanism capable of adjusting left and right suspensions and a door frame posture adjusting mechanism capable of actively adjusting postures. The controller can command the two mechanisms to work in different cooperation modes according to different recognition results, for example, the two mechanisms mainly adjust a vehicle body on a ramp, stabilize the vehicle body and goods when the goods are stacked at high positions, and preferentially stabilize the goods and then switch the vehicle under the most dangerous composite working condition. According to the method, passive alarm is changed into active cooperative adjustment, and the working efficiency is effectively guaranteed while the operation safety of the forklift under the complex working condition is improved.

The invention provides an efficient cable laying device for electric power engineering construction, and relates to the technical field of electric power engineering construction.The efficient cable laying device comprises a base and a guide mechanism, a lifting mechanism is arranged on the surface of the base, a telescopic rod is connected to the surface of the base, universal brake wheels are connected to the bottom of the base, and a handle is connected to the surface of the base; one end of the telescopic rod is connected with a connecting seat, a rotary driving mechanism is arranged on the surface of the connecting seat, a guide mechanism is arranged on the surface of the telescopic rod, the height of the device is flexibly and accurately adjusted through the lifting mechanism, the device is suitable for various laying scenes, stable lifting is ensured, and construction convenience and reliability are improved; the sleeve and the limiting piece can be in butt joint rapidly and accurately through the rotary driving mechanism, the cable laying direction is driven to be adjusted flexibly, cables of multiple specifications are compatible, the construction efficiency is improved, the guide mechanism can automatically adapt to cable specification changes, clamping and limiting are stable, manual intervention is reduced, and the laying efficiency and quality in the complex environment are improved.

The utility model relates to the technical field of telescopic rods, in particular to a differential screw rigid-flexible coupling electric telescopic rod. In order to solve the problems that an existing posture adjusting platform is complex in control, rod piece stretching and retracting control depends on material heating, heat influences are generated on other structures, and the stability and accuracy of a system are interfered, the following technical scheme is provided: the posture adjusting platform comprises a mounting seat which is arranged in a square shape; the driving mechanism is mounted in the mounting seat; the two sets of synchronous plates are arranged on the two sides of the mounting base correspondingly, and a moving frame is jointly mounted on the two sets of synchronous plates; the positioning plate is arranged on one side of the mounting seat; and the adjusting assembly is connected with the synchronous plate and the positioning plate and is used for finely adjusting the distance between the synchronous plate and the positioning plate. According to the utility model, high-precision adjustment of postures can be realized, the control difficulty is simplified, the stability and accuracy of system operation are improved, and the application range of related technologies in practical engineering is expanded.

The invention relates to a quick connector and a production mold thereof, and relates to the technical field of mechanical engineering, and the quick connector comprises a first pipeline, a second pipeline and a connecting shell made of an engineering plastic material. The corrosion resistance is improved through the connecting shell made of the engineering plastic, the connecting shell is made of the engineering plastic, a metal hoop in the prior art is replaced, and the problem of metal corrosion is solved from the material level. The hoop directly wraps the connecting end of a pipeline, does not need to be exposed to the external environment, can resist erosion of water vapor and corrosive media for a long time, ensures the stability of a connecting structure, and solves the problems of clamping force attenuation and leakage hidden danger caused by corrosion of a traditional metal hoop. Tool-free rapid operation is achieved through the limiting mechanism, and through the synergistic effect of a limiting sliding rod, a first spring and a first ball, when the connecting shell is pulled upwards, constraint of an annular limiting hole to the first ball is relieved, the first spring rebounds to drive the limiting sliding rod to be away from the second pipeline, and pipeline insertion is facilitated.

The invention relates to the technical field of highway engineering construction, and discloses a joint cutting device and method for highway engineering.The joint cutting device comprises a moving platform, a through opening is formed in the center of the top of the moving platform, a movable plate is arranged at the through opening, and the front side and the rear side of the top of the moving platform are each provided with a linear module; the moving seats of the two groups of linear modules are fixedly connected with the outer side of the movable plate, the number of each group of linear modules is one or more, a joint cutting mechanism is arranged at the bottom of the movable plate, and anti-deviation steering mechanisms are arranged at the four corners of the bottom of the moving platform. Through a positioning structure of the deviation-preventing steering mechanism, the steering angle of the wheels is accurate and controllable, the problems of deviation and uneven depth in the joint cutting process can be effectively solved by matching with the stable lifting function of the linear module, and particularly in long-distance parallel joint cutting construction, it can be guaranteed that all cut joints are kept parallel and uniform in specification, the construction quality is improved, and the construction cost is reduced. And the joint cutting precision is obviously improved.

The invention discloses an automatic opening and closing protection device and protection method, belongs to the field of mechanical engineering, and aims to solve the protection problem of an existing engineering machinery rotating platform. The automatic opening and closing protection device comprises a platform group, a supporting mechanism, a protection door mechanism and a driving mechanism, and the platform group comprises a front platform and a rear platform; the supporting mechanism is installed on the rear platform and comprises a door support installed on the rear platform, a supporting shaft connected to the door support, a fixed supporting lug installed on the supporting shaft and a rotating pin shaft connected to the fixed supporting lug. The protective door mechanism is connected to one side of the supporting mechanism and comprises a door connecting frame installed on the fixed supporting lug through a rotating pin shaft, a handrail installed on the door connecting frame and a hinge seat installed at the bottom of the door connecting frame. And the power end of the driving mechanism is connected with the hinge seat. When the front rack and the rear rack rotate relatively, the protective door mechanism is driven to be unfolded towards the front platform, so that a pedestrian path with a coherent protective guardrail is formed by a front platform channel and a rear platform channel, and meanwhile the handrail storage function is achieved.