444 results about "Track gauge" patented technology

The embodiment of the invention provides a multi-unmanned aerial vehicle cooperative surveying and mapping method and system for areas along a railway, and belongs to the technical field of railway surveying and mapping. The method comprises the steps that the unmanned aerial vehicle collects monitoring data in the flight process; the relative position and posture between the aircrafts are dynamically adjusted, and an observation configuration with variable baseline parameters is constructed; laser ranging modules carried by the unmanned aerial vehicles are controlled to execute synchronous ranging operation, and multiple sets of laser point cloud data covering the railway structure area are generated; performing coordinate registration and fusion on the collected laser point cloud data, and combining position information and attitude information of each unmanned aerial vehicle; and extracting geometric dimension parameters of the railway structure from the compensated three-dimensional model, and outputting the geometric dimension parameters as measurement results. According to the scheme, high-precision non-contact measurement of geometric dimension parameters such as the track gauge, the height difference and the roll angle of a railway track structure is achieved.

The invention discloses a rapid measurement method and system for geometric irregularity of a track in a turnout zone. The method comprises the steps that complete three-dimensional point cloud data of the surface of a railway turnout steel rail are obtained in real time through a multi-angle line structure laser scanner on a special detection vehicle body; accurate attitude and position data of the detected vehicle body in the measurement process are obtained in real time through an inertial navigation measurement unit and an odometer; obtaining a high-precision pose of a detected vehicle body through a robust dead reckoning method of an IMU (Inertial Measurement Unit) assisted by a speedometer dynamic lever arm value based on a variable wheel-rail contact point; constructing a turnout area three-dimensional point cloud model; extracting geometric irregularity key points of turnout steel rail point cloud from the turnout area three-dimensional point cloud model; calculating parameters of track gauge, horizontal and rail direction irregularity and unevenness; the special detection vehicle body can quickly and stably pass through a turnout area to complete continuous and accurate measurement of geometric irregularity of a track.

The invention belongs to the technical field of data measurement, and discloses a high-speed railway ballastless track construction measurement method, which comprises the following steps of: carrying out internal reference and external reference calibration on a binocular camera of a track detection trolley; obtaining related data containing a binocular image, and carrying out space-time alignment processing on the related data so as to construct a prediction state vector; carrying out stereo matching on the binocular image to generate a prediction disparity map, and carrying out three-dimensional reconstruction on the prediction disparity map to obtain a track point cloud map; and extracting a track inner side point coordinate sequence and a track height program sequence from the track point cloud picture, and generating a corresponding track gauge table and a corresponding smoothness table. According to the invention, vision, three-dimensional reconstruction and inertial navigation technologies are integrated, and integrated detection of gauge, elevation and smoothness parameters is realized.

The invention provides intelligent track flaw detection equipment and a flaw detection method, and belongs to the technical field of track flaw detection. According to the method, an innovative strategy of staged flaw detection is adopted, double-mode dynamic switching of rapid rough flaw detection and low-speed fine flaw detection is utilized, a high-frame-rate visual system is used for screening surface defects, ultrasonic wave and laser ranging are combined, deep cracks and track gauge deviation are detected, all defect types are covered, and defect missing detection errors at a single speed are compensated. The flaw detection equipment comprises a flaw detection trolley, the flaw detection trolley comprises a chassis, and the chassis is composed of an advancing cross beam and two groups of advancing longitudinal beams connected to the end parts of the advancing cross beam; the advancing cross beam is connected with a visual system and a laser range finder, and an ultrasonic flaw detector is arranged on the advancing longitudinal beam. According to the invention, ultrasonic wave, machine vision and laser ranging technologies are integrated, full-dimension, full-climate and full-scene track flaw detection is realized, and the railway operation and maintenance efficiency, the intelligent level and the operation safety are greatly improved.

The invention provides a railway bridge line beam eccentricity measuring method, which at least comprises the following steps of: acquiring position information of a bridge guardrail by adopting a radar module, and adjusting the height position of a laser ranging module according to the position information, so that the laser ranging module can detect the bridge guardrail for ranging; the laser ranging module is adopted to measure the distances between the first steel rail and the bridge guardrails on the two sides of the first steel rail at the same time, and the eccentric distance is calculated according to the distance parameters measured by the laser ranging module and the track gauge of the track. The invention provides a device for measuring the eccentricity of the railway bridge line beam. The measuring device is applied to the method for measuring the eccentricity of the railway bridge line beam. The method has the beneficial effect that the eccentric distance along the track can be automatically and continuously measured.

The invention relates to the technical field of rail transit, and provides a multifunctional rail detection system, which comprises a multi-source data acquisition unit, an optical fiber inertial navigation sensor, a laser array module, a dual-mode camera group, a radar speed measurement module and a temperature and humidity sensor, the data acquisition module is used for synchronously acquiring track geometric parameters, three-dimensional surface topography, inertial navigation data, real-time vehicle speed and environmental parameters; the dynamic processing unit is arranged in the compartment and comprises a data fusion controller, a self-adaptive Kalman filtering module, an anomaly diagnosis engine and an edge computing host, and the data fusion controller integrates multi-source data through a multi-thread parallel processing technology. On the basis of self-adaptive Kalman filtering and vehicle speed-parameter dynamic mapping, the track gauge detection error under the variable speed working condition is reduced to + / -0.3 mm from + / -3 mm, and the curvature radius calculation error lt is obtained; and the predictive maintenance model prolongs the overhaul period of the track by 40%, and reduces the operation and maintenance cost by 35%.

The invention discloses a rail gauge and level detection method and system based on mobile laser scanning, relates to the technical field of railway track detection, and solves the problem that effective data is difficult to efficiently and accurately extract from mass data for gauge and level detection in the existing mobile laser scanning technology. According to the technical scheme, the method is characterized in that steel rail railhead point cloud data are segmented from rail laser point cloud data on the basis of the geometrical shape of a standard cross section of a steel rail railhead, irrelevant data are reduced as much as possible while the rail gauge and data needed by horizontal detection are reserved, and the data processing pressure is effectively reduced; steel rail railhead point cloud data is obtained based on combined segmentation of geometric constraint and physical constraint, and the segmentation precision of the steel rail railhead part is improved; point cloud data are simplified based on a steel rail head point cloud model, and the calculation precision is guaranteed while the calculation pressure is reduced; feature points and mileage information are stored based on a quick lookup table, quick detection is realized, and the detection efficiency is improved.

The embodiment of the invention provides a rail distance measuring device for rail transit, and relates to the technical field of rail distance measurement. A track distance measuring device for track traffic comprises a measuring body, two sets of moving assemblies, a marking assembly, a driving part, an auxiliary measuring mechanism and a sealing assembly, and the two sets of moving assemblies are located on the two sides of the measuring body respectively and used for walking on a track; the auxiliary measuring mechanism is mounted on one side of the measuring body, and two ends of the auxiliary measuring mechanism are respectively contacted with the inner walls of the two groups of rails. High-precision track gauge measurement is achieved through the measuring wheel and the encoder, track gauge abnormity is sensed in real time in combination with the side rolling wheel and the displacement sensor, automatic marking is achieved in cooperation with the pump body, the storage box and the liquid outlet pipe, and leakage is prevented through the sealing assembly in the non-working state; meanwhile, full-automatic control over rolling wheel avoiding, sealing relieving and liquid spraying marking is achieved through a driving part linkage mechanism, and the track detection precision, efficiency, the intelligent level and the device reliability are remarkably improved.

The invention relates to the technical field of data processing, and discloses a railway construction data processing method and system. The method comprises the steps of performing semantic annotation on track laying, line measurement and construction monitoring data through RDF semantic association to obtain a semantic data set; setting smoothness constraint screening qualified data according to the gauge deviation and the elevation deviation; qualified data are input into an improved firework algorithm, and track geometric parameters are optimized through a curvature self-adaptive explosion mechanism; adopting improved Kriging interpolation to complement the track center line, the track surface elevation and the track gauge change data; and establishing a construction quality constraint matrix, and cooperatively adjusting track line shape, elevation control and track gauge precision through a sequential quadratic programming algorithm. According to the method, the technical problems of lack of multi-source data semantic association, insufficient professional algorithm adaptability and insufficient parameter collaborative optimization capability in railway construction are solved.

Embodiments of the present application provide a kind of multi-unmanned aerial vehicle cooperative surveying and mapping method and system for the area along railway, belong to railway surveying and mapping technical field.The method comprises: unmanned aerial vehicle acquires monitoring data in flight process;Dynamic adjustment the relative position and attitude between aircraft, build the observation configuration with change baseline parameter;Control the laser ranging module of each unmanned aerial vehicle carried out synchronous ranging operation, generate multiple sets of laser point cloud data covering railway structure area;The coordinate registration and fusion of the laser point cloud data collected are carried out, and the position information and attitude information of each unmanned aerial vehicle are combined;From the three-dimensional model after compensation, the geometric dimension parameter of railway structure is extracted, and the geometric dimension parameter is output as measurement result.The present application scheme realizes the high-precision non-contact measurement of the geometric dimension parameter such as track gauge, height difference, lateral angle of railway track structure.

The invention relates to the technical field of railway engineering, in particular to a track smoothness influence factor correlation analysis method which comprises the following steps: taking track gauge deviation, unevenness, horizontal irregularity, track direction irregularity and curvature change rate corresponding to track smoothness as parameter components; calculating a reference value and an allowable threshold value between the parameter components by using a Gaussian mixture model, and determining the weight of each parameter component; identifying degradation characteristics of each parameter component under the time sequence; using the updating time of the comprehensive degradation degree as a key node of each parameter component by using a linear weighting form; verifying the association probability of each key node and the maintenance record, setting an early warning parameter set, and setting the change trend of each key node according to the number of continuous early warning times in the early warning parameter set; performing interaction analysis based on the change trend of each key node, and determining an early warning range boundary of each parameter component under parameter accumulation; the accuracy and efficiency of track smoothness analysis are realized.

The invention relates to intelligent track space attitude detection equipment and a detection method thereof.The detection equipment comprises two walking systems, rod inserting equipment, track detection equipment and a control system, the two walking systems are connected to the upper side of a track in a rolling mode, and the rod inserting equipment and the track detection equipment are installed on the two walking systems correspondingly; a positioning navigation system and a data acquisition system are mounted on the walking system, and the track inspection equipment comprises a coordinate acquisition system, a track gauge measurement system and an ultrahigh measurement system. According to the design, the rod inserting equipment and the rail inspection equipment are combined, automatic walking is conducted through the walking system, therefore, the operation stability can be guaranteed, the labor intensity is greatly reduced, meanwhile, the real-time coordinates of the rod inserting equipment are obtained in combination with the positioning navigation system and the data acquisition system, and therefore the accuracy and feedback speed of rod inserting measurement are effectively guaranteed; the positioning navigation system is combined with the superelevation measuring system and the track gauge measuring system, so that the track initial adjustment speed can be increased, and the track fine adjustment precision can be improved through cooperation of the inserting rod equipment and the track detection equipment.

The utility model relates to the technical field of bridge inspection vehicles, aims to solve the problems that in the prior art, due to arrangement of tracks and portal frames, standardization of trusses is difficult, the efficiency of design, development and large-scale production of conventional beam bottom inspection vehicles is low, and manpower resources are wasted, and provides a suspension type inspection vehicle portal frame with a variable track gauge. Comprising an upper connecting seat, the upper connecting seat is used for being connected with a rotary support of a walking mechanism, the bottom of the upper connecting seat is connected with at least one pair of adjustable pull rods, the length of the adjustable pull rods can be adjusted and changed, and one ends of two of the pair of adjustable pull rods are hinged to the same point of the bottom of the upper connecting seat. The other ends of the two adjustable pull rods are hinged to the two ends of a fixing frame respectively, the fixing frame is used for being fixed to the top face of a truss, and the two ends of the fixing frame are fixed to truss nodes. According to the utility model, under the condition that the truss of the inspection vehicle is reasonably stressed and the portal frame is arranged at the node position of the truss, the installation and arrangement of the inspection vehicle at any gauge can be realized.

The invention provides an equivalent taper correction calculation method and system based on wheel rail profile data, and relates to the technical field of motor train unit application and maintenance, and the method comprises the steps: collecting profile coordinate data of wheels, wheel diameters and distance measurement in wheel pairs through machine tool measurement equipment, and obtaining standard rail profile coordinate data and a rail gauge according to the type of a steel rail; carrying out secondary interpolation and smoothing processing on the wheel rail profile coordinates by adopting a spline function to generate wheel rail profile data; the equivalent taper is calculated through a nonlinear differential equation integral algorithm, and a relation curve of the equivalent taper and the transverse movement amount is finally solved; interpolation processing is conducted on the relation curve of the equivalent taper and the transverse movement amount, final correction is conducted on the nominal equivalent taper through an origin symmetry correction algorithm, and a corrected equivalent taper value is obtained. The method has the beneficial effects that the measurement precision of the equivalent taper is improved, the wheel turning repair strategy is optimized, the operation safety and stability of the motor train unit are guaranteed, and the maintenance cost is reduced.

This invention discloses a wheel gauge adjustment device and a rail grinding trolley, specifically relating to the technical field of rail grinding equipment. The wheel gauge adjustment mechanism includes two independent pneumatic actuators, two telescopic displacement detection mechanisms, and an air source assembly. The two pneumatic actuators are respectively connected to two wheel assemblies, enabling independent driving of the wheels along the track width direction. The air source assembly provides power to the pneumatic actuators. The telescopic displacement detection mechanisms detect the wheel telescopic displacement in real time. The gauge detection mechanism is equipped with left and right displacement sensors, which respectively detect the distance between the left and right tracks and the corresponding sensors in real time. The controller calculates the real-time track gauge and wheel alignment deviation, controlling the two pneumatic actuators to operate synchronously or differentially, achieving automatic wheel alignment relative to the track centerline. This invention enables flexible gauge adjustment, ensuring stable wheel-axle gauge and precise alignment of the trolley and rail during operation, providing reliable structural support for efficient and high-quality rail grinding operations.

This invention discloses a steel-concrete composite sleeper for ballastless track, belonging to the field of ballastless track technology. The steel-concrete composite sleeper includes multiple adjusting pipes and two spaced-apart sleeper units. Each sleeper unit includes multiple steel pipes and sleeper blocks. For any given sleeper unit, the multiple adjusting pipes and multiple steel pipes correspond one-to-one. One end of each steel pipe is inserted into a sleeper block, and each steel pipe is filled with concrete filler. Each sleeper block and the corresponding concrete filler are integrally cast with concrete. The other ends of two opposing steel pipes are movably and coaxially inserted into the two ends of the corresponding adjusting pipes to adjust the spacing between the two sleeper blocks. This invention provides a steel-concrete composite sleeper for ballastless track, which not only allows for the pre-casting of sleeper units, improving the overall construction efficiency of ballastless track, but also allows for adjustment of the track gauge between the two rails, ensuring the gauge meets on-site installation requirements.

The invention discloses a subway operation and maintenance track geometric dimension measurement and acquisition real-time alarm system, which comprises a transverse frame, a first connecting sleeve is mounted on the left side of the outer part of the transverse frame, a track gauge and superelevation sensor is mounted at the center of the top of the transverse frame, and a support frame is mounted at the center of the front side of the transverse frame. A cart handle is movably connected into the supporting frame through a rotating shaft, a second connecting sleeve is installed on the right side of the exterior of the transverse frame, and placing plates are connected to the bottoms of the front side and the rear side of the second connecting sleeve. The moving rollers are transferred to the top of the subway track, and the cart handle is pushed to enable the transverse rack to move forwards. In the process that the moving rollers roll forwards at the top of the subway track, the mileage coding sensor completes measurement of the walking mileage of the moving rollers; furthermore, in the process of moving the rollers forwards, the track gauge, the superelevation sensor and the inclination sensor also detect the subway track data in real time, and all types of detection data are transmitted to the single-chip microcomputer.

A track gauge recognition method and device based on millimeter wave radar point cloud, the method comprising: acquiring millimeter wave radar point cloud collected by a millimeter wave radar at a front end of a railway vehicle, wherein the millimeter wave radar point cloud comprises a plurality of first point cloud points; extracting a plurality of second point cloud points located in a preset position interval from the plurality of first point cloud points; extracting a plurality of third point cloud points within a preset speed range from the plurality of second point cloud points; clustering the plurality of third point cloud points according to the distribution of the plurality of third point cloud points to obtain a plurality of skeleton points corresponding to a track center position; determining the direction of the skeleton points according to the positions of the third point cloud points within a preset range around the skeleton points; determining track gauge boundary points located on both sides of each skeleton point according to the position and direction of each skeleton point and the track width; and determining the track gauge according to the plurality of track gauge boundary points. The present application can accurately recognize the track gauge based on millimeter wave radar point cloud, and can overcome the influence of complex weather and light interference.

The application discloses a high-speed railway full-process digitalized screen cleaning construction method, and particularly relates to the technical field of high-speed railway digitalized construction, which comprises the following steps: S1, determining line design data and rechecking; S2, measuring the line and placing piles, cooperating with the screen cleaning work to operate according to the quality control standard, measuring the track surface elevation of the line after screen cleaning by means of an auxiliary measurement system combined with a distance measurement module, thereby controlling the elevation of the screen cleaning section in real time; S3, daily construction operation process; S4, performing preliminary tamping operation; S5, performing rough tamping operation; S6, performing fine tamping operation; S7, performing fine tamping operation again, after the completion of the second track gauge fine adjustment, performing tamping operation again by means of the fine tamping scheme prepared by using the inertial navigation operation fine measurement data, and performing stable tamping operation, and whether to perform reinforcing tamping is determined according to the TQI and fine measurement data and the like; S8, performing quality rechecking and analysis, and performing appearance arrangement and acceptance, and then performing project completion.

This invention discloses a four-track, three-line method for muck removal and transportation in variable cross-section tunnel anchors. For tunnel anchors with steep axial inclination angles, four shared tracks are used to form three lines: one is a large-gauge integrated equipment and material transport line, and two are small-gauge circulating muck removal lines. First, the integrated equipment and material transport line, driven by a power mechanism, pulls a transport platform to transport the relevant equipment and materials for excavation at the tunnel face. Near the tunnel face, the excavation equipment is unloaded for excavation. The excavated muck is then circulated and removed using the dual-circulation muck removal lines, driven by a power mechanism and circulated by mine cars. This allows excavation and muck removal to be carried out simultaneously, significantly improving muck removal efficiency. After excavation, the transport platform returns to the outside of the tunnel anchor to load support materials before returning to the tunnel face. The entire transportation process involves fewer transfer steps, improving construction efficiency and reducing environmental pollution. The transport platform and mine cars are driven by power mechanisms and run along the tracks, resulting in a higher safety factor.

The utility model discloses a track gauge adjusting device for a traveling mechanism of a shipbuilding gantry crane, which relates to the field of manufacturing and mounting of shipbuilding gantry cranes and comprises a traveling mechanism and traveling mechanism components connected to two sides of the lower end of the traveling mechanism. A track gauge adjusting mechanism is mounted below the hinge point shaft; the track gauge adjusting mechanism comprises a tool beam and a bracket tool, and the bracket tool is located above the tool beam and used for supporting the walking mechanism assembly. A rail tread is arranged at the top of the tool beam, an adjusting rail is welded to the rail tread, and the adjusting rail is in sliding connection with the bracket tool; by means of the tool beam, the adjusting track and the bracket tool, the walking mechanism assemblies on the two sides can be moved to the needed positions after the walking mechanism assemblies are emptied, the track gauge of the walking mechanism is adjusted, the moving distance can be controlled, and therefore the track gauge is accurately adjusted, and the working efficiency is improved. The problems of track gauge deviation and wheel and track interference of the walking mechanism are solved.

The present application discloses a kind of railway subgrade settlement detection system and detection method, railway subgrade settlement detection system includes being arranged on the wrist arm column of one side of track high-definition image acquisition device, track gauge measuring device, embedded processing board, data transmission device and battery module, and reference point being arranged on the wrist arm column of other side of track and target point being arranged on the sleeper of track two sides, high-definition image acquisition device is used to collect reference point and target point image and transmit to embedded processing board, track gauge measuring device is used to measure the distance between target point and high-definition image acquisition device and transmit to embedded processing board, embedded processing board is connected with data transmission device, the present application carries out settlement data calculation by embedded processing board, data is transmitted to data processing center by data transmission device, data processing center detects whether settlement occurs and timely early warning, can real-time monitoring and timely discover subgrade condition, improve the detection efficiency of subgrade settlement, and detection precision is high.

A wheelchair-accessible low-floor tram bogie relates to the technical field of low-floor tram bogies and includes a frame, primary longitudinal tie rods, a primary suspension spring assembly, a brake caliper, a brake disc, a coupling, a motor, a secondary suspension spring assembly, a secondary vertical damper, a traction tie rod, a transverse stop, a magnetic rail brake, wheels, an axle bridge, an axlebox, a gearbox, and a wheel core assembly. The bogie of the present invention meets the requirements for convenience and safety for disabled people passing through the vehicle, as well as passenger comfort, while meeting the standard vehicle width and standard track gauge, without compromising low-floor tram bogie performance and maintaining an unchanged vehicle floor surface.

The present invention relates to the technical field of track gauge measurement, and specifically relates to an intelligent remotely controlled track gauge laser detection vehicle, which includes a base and rollers arranged on both sides of the base; the base is movably arranged on the track along the extension direction of the track, and two near-track measurement mechanisms are symmetrically arranged on both sides of the base with respect to the length direction of the base, and the two near-track measurement mechanisms are respectively in contact with the side walls of the two tracks. The near-track measurement mechanism is used to measure the distance between it and the side wall of the track, and the distance values recorded by the two near-track measurement mechanisms are a1 and a2 respectively. In the width direction of the base, there is a gap between the two near-track measurement mechanisms; a spacing measurement mechanism is horizontally arranged in the gap, and the spacing measurement mechanism is used to measure the distance between the two near-track measurement mechanisms, recorded as b, and the track gauge is a1 + a2 + b. A remote control receiving device is arranged in the base. The present invention improves the measurement accuracy and reduces the influence of external light on laser detection.

The application discloses a split adjustable embedded track slab and a construction method thereof, and relates to the technical field of rail transit fasteners. The track slab comprises a left track slab and a right track slab which are arranged separately, and a limiting hole is arranged on each side of the track slab; and a limiting member is arranged below the track slab, and a limiting column matched with the limiting hole is arranged on the limiting member; the application adopts a left-right split structure, and a buffer pad and an adjusting gasket are arranged between the limiting column and the limiting hole, so that the transverse impact can be buffered, and the track gauge can be flexibly adjusted by replacing the gasket; the upper surface of the limiting member is lower than the upper surface of the track slab, and the application further provides a plate assembly tool and a construction method of a system. The application significantly improves the installation precision, adaptability, vibration and noise reduction effect and maintenance convenience of the track slab.

The utility model discloses a guide device for track detection, which relates to the technical field of track guide and comprises a fixed track, a traveling chassis is arranged at the top of the fixed track, and guide moving devices are arranged on four sides of the bottom of the traveling chassis and are mounted at the top of the fixed track in a rolling manner. According to the guide device for track detection, the situation that the guide device derails in the moving process due to the fact that the track gauges of the fixed tracks on the two sides have deviation is avoided, the guide device can adapt to the scene that the distance between the inner sides is changed due to abrasion or deviation of the inner sides of the tracks, damping is conducted on the guide device through the effect of the damping rods, and the service life of the guide device is prolonged. Jumping of a single auxiliary wheel device is avoided, the stability of the whole guiding device during movement is not affected, the cushioning effect is achieved, the detection precision of a sensor in the detection robot is improved, the four auxiliary driving wheels rotate along with the turning position at the top of the fixed rail, and the stability of the whole guiding device during turning position reversing is improved.

The embodiment of the application provides a subway track gauge vehicle for rapid measurement in a complex environment, which comprises a track trolley, a support, a left first width indicating rod, a right first width indicating rod and a top width indicating rod, the track trolley comprises a trolley body and a trolley wheel, and the track trolley can walk along a track of a to-be-detected section; the support is detachably installed above the trolley body; the left first width indicating rod is detachably fixedly connected with the support, and the left first width indicating rod is arranged on the left side of the advancing direction of the track trolley in the direction of the height of the track trolley; the right first width indicating rod is detachably fixedly connected with the support, and the right first width indicating rod is arranged on the right side of the advancing direction of the track trolley in the direction of the height of the track trolley; and the top width indicating rod is arranged in the width direction of the track trolley, and the top width indicating rod is detachably fixedly connected with the support. The subway track gauge vehicle for rapid measurement in a complex environment provided by the embodiment can quickly and conveniently detect whether there is an intrusion problem of a subway track along-line equipment.

The present invention relates to the technical field of double-track railways, and provides a conversion type of turntable system for narrow and wide gauge common track within a turntable, which includes a turntable and also includes three tracks extending from the access end inside the turntable to the outside of the turntable. The three tracks are arranged at intervals in the same direction. The two outer tracks have a wide gauge, and the inner track has a narrow gauge. There is an annular track inside the turntable for the railway locomotive to rotate 180 degrees, and there is a set of two narrow and wide gauge common track conversion switches between the two ends of the line inside the turntable. The present invention adopts a turntable system for railway double-track with common track conversion inside the turntable to replace the traditional railway double-track triangle to realize the turning operation of railway locomotives with two gauges of wide and narrow gauges. Generally, a railway triangle covers an area of about 16,000 square meters, lays about 900 meters of double-track, and has 4 sets of double-track switches. However, the translation type of turntable in this patent only covers an area of 1,670 square meters, lays only 100 meters of double-track, and has one set of conversion switches. The land occupation is only 10.4% of that of the railway triangle, and the investment is only 30% of that of the railway triangle.

The present application belongs to the technical field of stretching machine variable track, and discloses a control method for full-automatic variable track of a stretching machine. For a synchronous stretching machine with the initial longitudinal stretching ratio as the maximum value, the stretching machine is divided into a forward chain track state and a return chain track state, the theoretical measurement values of the forward track gauge, the return track gauge, the outlet chain wheel disc offset and the return chain clamp quantity at different positions of the stretching zone corresponding to an arbitrary target longitudinal stretching ratio r are calculated, the motor is driven according to the above parameters, and the full-automatic variable track of the synchronous stretching machine is realized. When the automatic variable track is performed, the interval from r0 to r is subdivided into small intervals with an interval of 0.1; the motor is driven, the forward track gauge, the return track gauge and the outlet chain wheel disc offset are controlled to run to the target values in the small intervals in the same time, and the deviation between the theoretical measurement value N 测 of the return chain clamp quantity and the actual measurement value is within the permitted range, then the next small interval is continuously executed until the target value is reached.