Detection vehicle for measuring dynamic modulus of roadbed

Abstract

The invention relates to the technical field of roadbed detection, and discloses a detection vehicle for measuring the dynamic modulus of a roadbed, which comprises a bearing vehicle, a connecting frame, a load generating device, a gas storage device and a power device, the load generating device applies a continuous cyclic load and a static load surrounding the detection point to the detection point; the power device provides compressed gas for the gas storage device; the gas storage device purifies compressed gas, controls the pressure of output gas and provides stable power for the load generation device; according to the invention, stable and uniformly distributed static load is applied to the circumference of the detection point by using the bearing vehicle and the load generation device, and stable and continuous cyclic load is applied to the detection point, so that the load generated by rapid passing of traffic flow to the roadbed is more truly simulated; the cyclic load enables the detection points to generate continuous dynamic deformation, the dynamic deformation values of the detection points are collected, a dynamic load-deformation curve of the roadbed is obtained, the dynamic modulus of the roadbed is calculated, and more real structural parameters are provided for evaluating the road bearing capacity.

Description

Technical Field

[0001] The invention relates to the technical field of roadbed detection, and in particular to a detection vehicle for measuring the dynamic modulus of a roadbed. Background Art

[0002] Deflection detection is an important part of ensuring the quality of road construction. The rebound deflection value of the roadbed and pavement can reflect the bearing capacity of the roadbed and pavement structure. At present, deflection detection mainly adopts the load-bearing plate Beckman beam measurement method and the drop-hammer deflection measurement. Among them, the Beckman beam measurement method lacks an automated detection method and the test requires a mechanical dial indicator. The measurement errors of the testers are common when reading. The automated drop-hammer deflection measurement is mainly for the upper structure, which cannot fully adapt to the soil foundation detection. In terms of the measurement environment, it can only simulate a single low-speed wheel passing or an equivalent single impact load, which is quite different from the actual vehicle continuous high-speed driving environment and cannot truly show the road use characteristics.

[0003] A monitoring system and method for roadbed settlement with application number CN201711328953.0 is disclosed, which includes reference piles arranged on bedrock at both ends of a section of roadbed, a plurality of settlement piles arranged at equal intervals between two reference piles, a guide rail erected on the reference piles and the settlement piles through a plurality of support rods, and a position marker is arranged at a position opposite to each settlement pile on the guide rail; a monitoring vehicle includes a vehicle body and a monitoring vehicle controller, an electric guide wheel assembly connected to the monitoring vehicle controller is installed on the vehicle body, the vehicle body is erected on the guide rail through the electric guide wheel assembly, a position detector, a height detection device and a communication module are arranged on the vehicle body, the position detector is connected to the monitoring vehicle controller for detecting the position marker on the guide rail, the height detection device is connected to the monitoring vehicle controller for obtaining the vehicle body height value when the vehicle body stops on the position marker one by one, and the communication module is used to send the obtained vehicle body height value to a monitoring center; the detection method disclosed by the invention still cannot accurately simulate the actual use of the roadbed and cannot truly display the condition of the roadbed. Summary of the invention

[0004] The purpose of the present invention is to provide a detection vehicle for measuring the dynamic modulus of roadbed in order to solve the above-mentioned problems in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A detection vehicle for measuring the dynamic modulus of a roadbed, comprising a load-bearing vehicle, a connecting frame, a load generating device, a gas storage device, a power device and a control cabinet; the connecting frame is installed on the load-bearing vehicle and is used to install the load generating device, the gas storage device, the power device and the control cabinet;

[0007] The load generating device is located in the middle of the load-bearing vehicle and applies a continuous cyclic dynamic load and a static load surrounding the detection point to the detection point; the power device is located above the rear axle of the load-bearing vehicle to provide compressed gas to the gas storage device; the gas storage device is located between the power device and the load generating device, and the gas storage device purifies the compressed gas, controls the output compressed gas pressure, and provides stable compressed air for the load generating device; the control cabinet is located at the rear of the load-bearing vehicle.

[0008] Furthermore, the power device includes a power battery, a screw air compressor, and a permanent magnet synchronous motor; the power battery provides power for the permanent magnet synchronous motor, and the permanent magnet synchronous motor drives the screw air compressor to deliver compressed gas to the gas storage device.

[0009] Furthermore, the gas storage device includes a first air bag, a second air bag, a primary filter, a secondary filter and a pressure regulating valve; the compressed gas generated by the power device passes through the primary filter and enters the first air bag for storage, and the compressed gas of the first air bag passes through the secondary filter and the pressure regulating valve and enters the second air bag for storage, and the second air bag provides stable compressed air for the load generating device.

[0010] Furthermore, the load generating device includes a fixed base, a lifting platform, a lifting transmission assembly, a dynamic load generating assembly and a plurality of static load generating assemblies; the fixed base is installed on a connecting frame; the lifting transmission assembly enables the lifting platform to rise and fall above the fixed base, the dynamic load generating assembly and the static load generating assembly are both installed on the lower side of the lifting platform and pass through the fixed base to apply load to the roadbed, and a plurality of static load generating assemblies are evenly arranged in a circle around the outer side of the dynamic load generating assembly.

[0011] Furthermore, the lifting transmission assembly includes a reducer, a servo motor, a plurality of commutators, a plurality of couplings and a plurality of screw lifters installed on the lifting platform; the screw lifter is installed on the edge of the lifting platform, and its screw is connected to the fixed base; the output end of the servo motor is connected to the input end of the reducer, and the output end of the reducer drives the plurality of screw lifters to move synchronously through a plurality of commutators and a plurality of couplings.

[0012] Furthermore, it also includes a static load loading plate in the shape of an annular disk, and the static load generating component is connected between the static load loading plate and the lifting platform.

[0013] Furthermore, the static load generating component includes a static load generating cylinder, a static load force transmission rod and a static load pressure sensor; the static load generating cylinder is installed on the lower side of the lifting platform, the static load force transmission rod is connected between the static load generating cylinder and the static load pressure sensor, and the lower side of the static load pressure sensor is connected to the static load loading plate floating ball joint; the output force of the static load generating component remains in the same state under normal conditions, and when the static load pressure sensor detects that the output force of the corresponding static load generating cylinder is inconsistent with the target force, the output force of the static load generating cylinder is adjusted.

[0014] Furthermore, the dynamic load generating assembly includes a dynamic load generating cylinder, a dynamic load pressure sensor, a dynamic load force transmission rod and a dynamic load loading plate; the dynamic load generating cylinder is installed on the lower side of the middle part of the lifting platform, and the dynamic load pressure sensor is connected between the dynamic load generating cylinder and the dynamic load force transmission rod; the lower end of the dynamic load force transmission rod is connected to the floating ball joint of the dynamic load loading plate; the dynamic load pressure sensor feeds back the pressure signal to adjust the output force of the dynamic load generating cylinder.

[0015] Furthermore, the load generating device also includes an acceleration sensor, a laser Doppler rangefinder, a descent position sensor and an ascending position sensor; the laser Doppler rangefinder is installed in the middle position of the fixed base, and the camera of the laser Doppler rangefinder is facing the component position of the bottom of the dynamic load generating assembly that acts on the detection point; the acceleration sensor is installed on the component at the bottom of the dynamic load generating assembly that acts on the detection point; the descent position sensor and the ascending position sensor are installed at different heights on the lower side of the lifting platform.

[0016] Furthermore, the acceleration sensor and the laser Doppler rangefinder measure the dynamic deformation displacement value of the detection point, and collect continuous displacement data to obtain the dynamic deformation curve of the roadbed.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention utilizes a load-bearing vehicle and a load generating device to apply a stable and uniformly distributed static load to the circumference of a detection point, and applies a stable and continuous cyclic load to the detection point, so as to more realistically simulate the impact load on the roadbed caused by the rapid passage of traffic; the cyclic load causes the detection point to produce continuous dynamic deformation, and the dynamic deformation displacement value and dynamic deformation value of the detection point are collected to obtain the dynamic load-deformation curve of the roadbed, calculate the dynamic modulus of the roadbed, and provide more realistic structural parameters for evaluating the bearing capacity of the road. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the present invention.

[0020] Figure 2 It is a top view schematic diagram of the present invention.

[0021] Figure 3 It is a rear view schematic diagram of the present invention.

[0022] Figure 4 Schematic diagram of a gas storage device of the present invention.

[0023] Figure 5 It is a schematic diagram of the power device of the present invention.

[0024] Figure 6 It is a three-dimensional schematic diagram of the load generating device of the present invention.

[0025] Figure 7 It is a front view schematic diagram of the load generating device of the present invention.

[0026] Figure 8 It is a schematic side view of the load generating device of the present invention.

[0027] Fig. 9 It is a top view schematic diagram of the load generating device of the present invention.

[0028] Fig.10 It is a schematic diagram of the lifting transmission assembly of the present invention.

[0029] Fig.11 It is a three-dimensional schematic diagram of the static load generating assembly of the present invention.

[0030] Fig.12 It is a top view schematic diagram of the static load generating assembly of the present invention.

[0031] Fig.13 It is a schematic diagram of the connection between the static load loading plate and the static load force transmission rod of the present invention.

[0032] Fig.14 It is a three-dimensional schematic diagram of the dynamic load generating assembly of the present invention.

[0033] Fig.15 It is a schematic diagram of the connection between the dynamic load loading plate and the dynamic load force transmission rod of the present invention.

[0034] Fig.16 It is a schematic diagram of the workflow of the present invention.

[0035] In the figure: 1. Carrying vehicle; 2. Connecting frame; 3. Load generating device; 4. Gas storage device; 5. Power device; 6. Control cabinet;

[0036] 41. First air bag; 42. Second air bag; 43. Primary filter; 44. Secondary filter; 45. Pressure regulating valve;

[0037] 51. Power battery; 52. Screw air compressor; 53. Permanent magnet synchronous motor; 54. Motor controller;

[0038] 311. Fixed base; 312. Lifting platform; 313. Lifting transmission assembly; 314. Dynamic load generating assembly; 315. Static load generating assembly; 316. Acceleration sensor; 317. Laser Doppler rangefinder; 318. Descending position sensor; 319. Ascending position sensor;

[0039] 321, reducer; 322, servo motor; 323, commutator; 324, coupling; 325, screw lift;

[0040] 331. Dynamic load generating cylinder; 332. Dynamic load pressure sensor; 333. Dynamic load force transmission rod; 334. Dynamic load connecting ball head; 335. Dynamic load floating connecting plate; 336. Dynamic load connecting ball bowl; 337. Dynamic load loading plate;

[0041] 341. Static load generating cylinder; 342. Static load force transmission rod; 343. Static load pressure sensor; 344. Static load loading plate; 345. Static load connecting ball head; 346. Static load floating connecting plate; 347. Static load connecting ball bowl. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0043] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In view of the above defects, the present invention can achieve the requirements of static load of 15KN and dynamic load of 8KN with the minimum total weight of the vehicle body, and can realize the conversion of the two working states of normal road driving loading requirements and detection driving loading requirements; different action conditions are applied according to the physical characteristics of different levels of the road surface, which can adapt to the rebound deflection detection of different levels of the construction road. Specific embodiments of the detection vehicle for measuring the dynamic modulus of the roadbed or the road deflection detection vehicle provided by the present invention are as follows:

[0047] See also Figure 1-16 The detection vehicle for measuring the dynamic modulus of the roadbed includes a load-bearing vehicle 1, a connecting frame 2, a load generating device 3, a gas storage device 4, a power device 5 and a control cabinet 6.

[0048] The load-carrying vehicle 1 is used to carry a load generating device 3, a power device 5, a gas storage device 4, a control cabinet 6, etc. The connecting frame 2 is installed at the bottom of the compartment of the load-carrying vehicle 1 and connected to the vehicle body. The load generating device 3, the power device 5, the gas storage device 4, and the control cabinet 6 are installed on the connecting frame 2; the continuous load generating device 3 is installed in the middle of the load-carrying vehicle 1 to apply a continuous and stable cyclic load to the detection point; the power device 5 is installed above the rear axle of the load-carrying vehicle 1 to provide power for the continuous load generating device 3 to work; the control cabinet 6 is installed at the rear of the load-carrying vehicle 1 to control the power device 5 and the continuous load generating device 3 to work; the gas storage device 4 is installed between the power device 5 and the continuous load generating device 3 to provide continuous and stable compressed gas to the load generating device 3.

[0049] The power device 5 includes a power battery 51, a screw air compressor 52, a permanent magnet synchronous motor 53 and a motor controller 54. The new energy power battery 51 is used to provide power for the permanent magnet synchronous motor 53, which facilitates the smooth implementation of outdoor detection work. The new energy electric control is used to control the permanent magnet synchronous motor 53 to drive the screw air compressor 52 to work. The screw air compressor 52 delivers compressed gas to the gas storage device 4, thereby providing continuous and stable compressed gas to the continuous load generating device 3.

[0050] The gas storage device 4 includes a first air bag 41, a second air bag 42, a primary filter 43, a secondary filter 44 and a pressure regulating valve 45. The compressed gas generated by the power device 5 is first filtered by the primary filter 43 and then enters the first air bag 41 for storage. The compressed gas in the first air bag 41 is output through the secondary filter 44 and the pressure regulating valve 45 to output clean compressed gas with stable air pressure and stored in the second air bag 42. The compressed gas in the second air bag 42 provides a stable air source for the load generating device 3. The compressed gas stored in the first air bag 41 plays a buffering role, protects the pressure regulating valve 45 and the second air bag 42, and cooperates with the pressure regulating valve 45 to stabilize the air pressure of the second air bag 42, which is conducive to the continuous and stable output of the load by the load generating device 3.

[0051] The load generating device 3 includes a fixed base 311, a lifting platform 312, a lifting transmission assembly 313, a dynamic load generating assembly 314, a plurality of static load generating assemblies 315, an acceleration sensor 316, a laser Doppler rangefinder 317, a descending position sensor 318 and an ascending position sensor 319.

[0052] The fixed base 311 is installed on the connecting frame 2; the lifting platform 312 is located above the fixed base 311; the lifting transmission assembly 313 is mainly arranged on the lifting platform 312, and the lifting transmission assembly 313 enables the lifting platform 312 to rise and fall above the fixed base 311; the dynamic load generating assembly 314 and the static load generating assembly 315 are installed and arranged on the lower side of the lifting platform 312, and the dynamic load generating assembly 314 and the static load generating assembly 315 can apply loads to the roadbed detection points through the base, and a number of static load generating assemblies 315 are evenly distributed in a circle around the outer side of the dynamic load generating assembly 314.

[0053] The laser Doppler rangefinder 317 is installed in the middle position of the fixed base 311, and the camera of the laser Doppler rangefinder 317 is facing the component position of the bottom of the dynamic load generating assembly 314 that acts on the roadbed detection point; two acceleration sensors 316 are set, and the two acceleration sensors 316 are symmetrically installed at the edge of the component at the bottom of the dynamic load generating assembly 314 that acts on the roadbed detection point; the descent position sensor 318 and the rise position sensor 319 are respectively installed at different heights on the lower side of the lifting platform 312, and a bracket matching the sensor is provided on the upper side of the fixed base 311. When the lifting platform 312 is raised or lowered, the lifting platform 312 drives the sensor height to change, and the sensor detects the lifting position of the lifting platform 312 by detecting the position of the bracket.

[0054] The lifting transmission assembly 313 includes a reducer 321, a servo motor 322, a plurality of commutators 323, a plurality of couplings 324 and a plurality of screw elevators 325; in this embodiment, the number of screw elevators 325 is four. The servo motor 322 is connected to the input end of the reducer 321 as a prime mover, and the servo motor 322 can accurately control the lifting height and lifting speed. The output end of the reducer 321 is connected to the input end of the commutator 323 arranged at the middle position on the upper side of the lifting platform 312 through the coupling 324, the output end of the commutator 323 at the middle position is connected to the input end of the commutator 323 arranged at the two sides of the lifting platform 312 through the coupling 324, and the output ends of the commutators 323 at the two sides are respectively connected to the input ends of the screw elevators 325 arranged at the four corners of the lifting platform 312 through the coupling 324. The lifting transmission assembly 313 controls the four screw elevators 325 arranged on the lifting platform 312 to work simultaneously through a servo motor 322, driving the lifting platform 312 and the dynamic load generating assembly 314 and the static load generating assembly 315 installed on the lower plane of the lifting platform 312 to rise and fall synchronously and smoothly; to facilitate the inspection and maintenance of the reversing machine 323 and the screw elevator 325, the coupling 324 used to connect the reversing machine 323 and the screw elevator 325 adopts a roller chain coupling.

[0055] The screw of the screw lift 325 passes through the lifting platform 312, and a flange is provided at the bottom of the screw of the screw lift 325. The flange provided at the bottom of the screw lift 325 is fixed on the fixed base 311; a circular through hole is provided in the middle of the fixed base 311, and the screw lift 325 is arranged around the circular through hole, and the dynamic load generating assembly 314 and the static load generating assembly 315 correspond to the circular through hole. A plurality of mounting ears with mounting holes are provided on the edge of the fixed base 311, and the fixed base 311 can be mounted on the connecting frame 2 by bolts using the mounting ears.

[0056] In this embodiment, a static load loading plate 344 and a plurality of static load generating assemblies 315 are provided; the static load generating assemblies 315 are connected between the lower side of the lifting platform 312 and the static load loading plate 344, and the static load generating assemblies 315 pass through the circular through hole in the middle of the fixed base 311; the static load generating assemblies 315 include a static load generating cylinder 341, a static load force transmitting rod 342, a static load pressure sensor 343, a static load connecting ball head 345, a static load floating connecting plate 346 and a static load connecting ball bowl 347. The static load loading plate 344 is a circular ring structure, and three to four circumferentially evenly distributed static load application points, i.e., static load generating assemblies 315, can be provided on the static load loading plate 344, and at each static load application point, the static load loading plate 344 is connected to the static load generating assemblies 315 by a floating ball joint, and each static load application point is provided with a static load pressure sensor 343, and the static load pressure sensor 343 feeds back a pressure signal to adjust the output force of the static load generating cylinder 341.

[0057] Specifically, the static load loading plate 344 adopts a circular plate structure. In this embodiment, three static load application points, i.e., three groups of static load generating components 315, are evenly arranged on the static load loading plate 344; in some other embodiments, the static load application points may be four. The piston rod of the static load generating cylinder 341 is connected to the upper end of the static load force transmission rod 342, the lower end of the static load force transmission rod 342 is connected to the upper end of the static load pressure sensor 343, the lower end of the static load pressure sensor 343 is connected to the rod end of the static load connecting ball head 345, the ball end of the static load connecting ball head 345 is connected to the static load connecting ball bowl 347 through the static load floating connecting plate 346 in a ball-jointed manner, the bottom surface of the static load connecting ball bowl 347 is bolted to the static load loading plate 344, and the static load generating cylinder 341 is installed on the lower side plane of the lifting platform 312. Through the above connection form, the static load loading plate 344 is floatingly connected to the static load generating assembly 315, and the force output by the static load generating cylinder 341 is applied to the circumferential area of ​​the roadbed detection point through the static load loading plate 344.

[0058] The dynamic load generating assembly 314 includes a dynamic load generating cylinder 331, a dynamic load pressure sensor 332, a dynamic load force transmission rod 333, a dynamic load connecting ball head 334, a dynamic load floating connecting plate 335, a dynamic load connecting ball bowl 336 and a dynamic load loading plate 337. In the present invention, the dynamic load generating assembly 314 is installed at the middle position of the lower side of the lifting platform 312, the dynamic load loading plate 337 is a disc-shaped structure, and the dynamic load loading plate 337 is connected to the dynamic load force transmission rod 333 by a floating ball joint. The dynamic load pressure sensor 332 feedbacks a pressure signal to control the action of the dynamic load generating cylinder 331 through the controller in the control cabinet 6 to adjust the output force of the dynamic load generating cylinder 331.

[0059] Specifically, the dynamic load loading plate 337 is a disc-shaped structure, and its diameter is just enough to move vertically freely within the circular ring of the static load loading plate 344. The dynamic load loading plate 337 is bolted to the dynamic load connecting ball bowl 336, and the dynamic load connecting ball bowl 336 is connected to the ball end ball joint of the dynamic load connecting ball head 334 through the dynamic load floating connecting plate 335. The rod end of the dynamic load connecting ball head 334 is connected to the lower end of the dynamic load force transmission rod 333, and the upper end of the dynamic load force transmission rod 333 is connected to the lower end of the dynamic load pressure sensor 332. The upper end of the dynamic load pressure sensor 332 is connected to the piston rod of the dynamic load generating cylinder 331, and the dynamic load generating cylinder 331 is installed in the middle position of the lower plane of the lifting platform 312. Through the above structure, the dynamic load loading plate 337 is connected to the dynamic load force transmission rod 333 in a floating manner, and the force output by the dynamic load generating cylinder 331 is applied to the roadbed detection point through the dynamic load loading plate 337.

[0060] In this embodiment, the camera of the laser Doppler rangefinder 317 is facing the dynamic load loading plate 337; two acceleration sensors 316 are symmetrically installed at the two edges of the dynamic load loading plate 337. In this embodiment, the dynamic load generating cylinder 331 and the static load generating cylinder 341 are both supplied with stable compressed air by the second air bag 42 as an air source; the second air bag 42 and the cylinder are controlled by the air path to realize the extension and retraction of the cylinder. Specifically, the dynamic load generating cylinder 331 is controlled to extend and retract according to the set frequency, and the dynamic load generating cylinder 331 generates a continuous cyclic dynamic load on the roadbed.

[0061] The gas pressure in the dynamic load generating cylinder 331 = temperature coefficient × gas volume at normal pressure / cylinder volume. The proportional solenoid valve is used to control the gas flow rate and direction to control the gas pressure in the output chamber. The cylinder output formula is: force F = gas pressure P × piston cross-sectional area S. In order to make the dynamic load generating cylinder 331 output a more stable, regular and accurate cyclic dynamic load, the dynamic load generating cylinder 331 is controlled, and the control part includes a function waveform generator, PID, and a function waveform compensator. The function waveform generator outputs a standard waveform to drive the PID control actuator, that is, the output of the dynamic load generating cylinder 331. The output force is fed back to the function waveform compensator by the force sensor, that is, the dynamic load pressure sensor 332. The actuator is corrected and controlled by the PID control part to achieve accurate output of cyclic dynamic loads including but not limited to sine waves, triangle waves, etc.

[0062] The testing process of measuring the dynamic modulus of the roadbed by the testing vehicle:

[0063] 1. After the inspection vehicle drives to the road inspection point, the permanent magnet synchronous motor 53 is started to drive the screw air compressor 52 to work, and the speed of the permanent magnet synchronous motor 53 is controlled to make the screw air compressor 52 discharge compressed air with upper and lower pressure limits. The compressed gas discharged by the screw air compressor 52 is filtered by the primary filter 43 and then stored in the first air bag 41. The compressed air stored in the first air bag 41 is filtered by the secondary filter 44, and then the clean compressed gas with stable air pressure is output by the high-precision, large-flow pressure regulating valve 45 and stored in the second air bag 42. The compressed gas in the second air bag 42 provides a stable air source for the dynamic load generating cylinder 331 and the static load generating cylinder 341 in the load generating device 3;

[0064] Second, the servo motor 322 in the load generating device 3 drives the screw lift 325 to drive the lifting platform 312 to descend at the maximum speed, and stops after the descending position sensor 318 receives a signal;

[0065] 3. The three static load generating cylinders 341 in the static load generating assembly 315 extend out, and the static load loading plate 344 contacts the roadbed surface, generating a static load effect near the circumference of the roadbed detection point under the action of the deadweight of the detection vehicle. The static load pressure sensor 343 measures the magnitude of the output force of each static load generating cylinder 341, and adjusts the inflation or exhaust action of the output chamber of the static load generating cylinder 341 according to the magnitude of the output force of the static load generating cylinder 341 fed back by each static load pressure sensor 343, that is, when a static load pressure sensor 343 feeds back that the output force of the static load generating cylinder 341 is greater than the set pressure value, the corresponding static load generating cylinder 341 needs to be controlled to exhaust slowly, and vice versa. The corresponding static load generating cylinder 341 is controlled to inflate, so that the output force of each static load generating cylinder 341 is always maintained at the set value, generating a uniformly distributed and stable static load around the detection point; in this embodiment, the force of each static load generating cylinder 341 is maintained at 5KN;

[0066] Fourth, the lifting platform 312 continues to descend in a slow speed mode. When the dynamic load pressure sensor 332 detects a pressure signal, the dynamic load loading plate 337 contacts the road base surface, and the dynamic load generating cylinder 331 is controlled to continuously output a cyclic force to the detection point;

[0067] 5. The roadbed detection point generates dynamic deformation under the cyclic force output by the dynamic load generating cylinder 331. The acceleration sensor 316 installed on the dynamic load loading plate 337 and the laser Doppler rangefinder 317 installed in the middle of the fixed base 311 measure the dynamic deformation displacement value of the roadbed detection point, and the continuous displacement data are collected to obtain the dynamic deformation curve of the roadbed;

[0068] 6. After the measurement is completed, the servo motor 322 is controlled to raise the lifting platform 312 until the rising position sensor 319 receives a signal, and the static load generating cylinder 341 is retracted to lift the static load loading plate 344;

[0069] VII. In order to make the static load generating assembly 315 generate a uniform and stable static load, the static load generating cylinder 341 needs to be inflated or exhausted in real time according to the magnitude of the output force of the static load generating cylinder 341 fed back by the static load pressure sensor 343, so that the extension stroke of the piston rod of the static load generating cylinder 341 is inconsistent, and the static load loading plate 344 and the static load force transmission rod 342 are connected by a floating ball joint with a large degree of freedom, allowing a certain adjustment stroke between the static load generating cylinder 341 and the piston rod;

[0070] 8. Due to the influence of the center of gravity of the vehicle body and the slope of the road, the dynamic load loading direction cannot be absolutely perpendicular to the detection point. The dynamic load loading plate 337 and the dynamic load transmission rod 333 are connected by a floating ball joint with a large degree of freedom, and the dynamic load can be evenly applied to the detection point. Because the inner and outer ring cylinder bases have a certain height difference, the inner and outer load application points in the present invention both use a floating ball joint connection structure, which can solve the problem that the center of gravity of the whole vehicle and the direction of the force are not collinear due to the road slope.

[0071] See also Fig.16 , where the inner ring refers to the dynamic load loading plate 337, and the outer ring refers to the static load loading plate 344. The platform descends, and the value of the inner ring pressure transmitter is significantly greater than zero. The outer ring is statically loaded. Then the inner ring is dynamically loaded. Platform adjustment (the speed is taken from the last normal process. If there is an over-limit and re-approach, the speed is reduced); the inner ring semi-positive loss of wave amplitude is 500KG force, if so, the platform descent stops; if the waveform is not distorted and the amplitude value is between 500KG and 800KG force, return to platform adjustment; if the waveform is distorted and the amplitude value is greater than or equal to 800KG force, cancel the inner ring loading, and then cancel the inner ring loading, the platform rises and reduces the platform descent speed during the next inner ring dynamic load loading process.

[0072] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A detection vehicle for measuring the dynamic modulus of a roadbed, characterized in that: It comprises a load-bearing vehicle (1), a connecting frame (2), a load generating device (3), a gas storage device (4), a power device (5) and a control cabinet (6); the connecting frame (2) is installed on the load-bearing vehicle (1) and is used to install the load generating device (3), the gas storage device (4), the power device (5) and the control cabinet (6); The load generating device (3) is located in the middle of the load-bearing vehicle (1) and applies a continuous cyclic dynamic load to the detection point and a static load surrounding the detection point; the power device (5) is located above the rear axle of the load-bearing vehicle (1) to provide compressed gas to the gas storage device (4); the gas storage device (4) is located between the power device (5) and the load generating device (3), and the gas storage device (4) purifies the compressed gas, controls the output compressed gas pressure, and provides stable compressed air for the load generating device (3); the control cabinet (6) is located at the rear of the load-bearing vehicle (1); The load generating device (3) comprises a fixed base (311), a lifting platform (312), a lifting transmission assembly (313), a dynamic load generating assembly (314) and a plurality of static load generating assemblies (315); the fixed base (311) is mounted on the connecting frame (2); the lifting transmission assembly (313) enables the lifting platform (312) to be lifted and lowered above the fixed base (311); the dynamic load generating assembly (314) and the static load generating assembly (315) are both mounted on the lower side of the lifting platform (312) and pass through the fixed base (311) to apply load to the roadbed, and a plurality of the static load generating assemblies (315) are evenly arranged in a circle around the outer side of the dynamic load generating assembly (314); The load generating device (3) further comprises an acceleration sensor (316), a laser Doppler rangefinder (317), a descent position sensor (318), and an ascending position sensor (319); the laser Doppler rangefinder (317) is mounted in the middle of the fixed base (311), and a camera of the laser Doppler rangefinder (317) faces the position of a component at the bottom of the dynamic load generating assembly (314) that acts on a detection point; the acceleration sensor (316) is mounted on a component at the bottom of the dynamic load generating assembly (314) that acts on a detection point; and the descent position sensor (318) and the ascending position sensor (319) are mounted at different heights on the lower side of the lifting platform (312).

2. A detection vehicle for measuring the dynamic modulus of roadbed according to claim 1, characterized in that: The power device (5) comprises a power battery (51), a screw air compressor (52), and a permanent magnet synchronous motor (53); the power battery (51) provides power to the permanent magnet synchronous motor (53), and the permanent magnet synchronous motor (53) drives the screw air compressor (52) to work and deliver compressed gas to the gas storage device (4).

3. A detection vehicle for measuring the dynamic modulus of roadbed according to claim 1, characterized in that: The gas storage device (4) comprises a first air bag (41), a second air bag (42), a primary filter (43), a secondary filter (44) and a pressure regulating valve (45); the compressed gas generated by the power device (5) passes through the primary filter (43) and enters the first air bag (41) for storage, the compressed gas in the first air bag (41) passes through the secondary filter (44) and the pressure regulating valve (45) and enters the second air bag (42) for storage, and the second air bag (42) provides stable compressed air for the load generating device (3).

4. A detection vehicle for measuring the dynamic modulus of roadbed according to claim 1, characterized in that: The lifting transmission assembly (313) comprises a reducer (321), a servo motor (322), a plurality of commutators (323), a plurality of couplings (324) and a plurality of screw lifts (325) installed on the lifting platform (312); the screw lifts (325) are installed on the edge of the lifting platform (312), and the screws thereof are connected to the fixed base (311); the output end of the servo motor (322) is connected to the input end of the reducer (321), and the output end of the reducer (321) drives the plurality of screw lifts (325) to move synchronously via the plurality of commutators (323) and the plurality of couplings (324).

5. A detection vehicle for measuring the dynamic modulus of roadbed according to claim 1, characterized in that: It also includes a static load loading plate (344) in the shape of a circular ring disk, and the static load generating assembly (315) is connected between the static load loading plate (344) and the lifting platform (312).

6. A detection vehicle for measuring the dynamic modulus of roadbed according to claim 5, characterized in that: The static load generating component (315) comprises a static load generating cylinder (341), a static load force transmission rod (342) and a static load pressure sensor (343); the static load generating cylinder (341) is installed on the lower side of the lifting platform (312); the static load force transmission rod (342) is connected between the static load generating cylinder (341) and the static load pressure sensor (343); the lower side of the static load pressure sensor (343) is connected to a floating ball joint of a static load loading plate (344); the output force of the static load generating component (315) remains in the same state under normal conditions; when the static load pressure sensor (343) detects that the output force of the corresponding static load generating cylinder (341) does not match the target force, the output force of the static load generating cylinder (341) is adjusted.

7. A detection vehicle for measuring the dynamic modulus of roadbed according to claim 1, characterized in that: The dynamic load generating assembly (314) comprises a dynamic load generating cylinder (331), a dynamic load pressure sensor (332), a dynamic load force transmission rod (333) and a dynamic load loading plate (337); the dynamic load generating cylinder (331) is installed at the lower middle side of the lifting platform (312); the dynamic load pressure sensor (332) is connected between the dynamic load generating cylinder (331) and the dynamic load force transmission rod (333); the lower end of the dynamic load force transmission rod (333) is connected to the dynamic load loading plate (337) by a floating ball joint; the dynamic load pressure sensor (332) feeds back a pressure signal to adjust the magnitude of the output force of the dynamic load generating cylinder (331).

8. A detection vehicle for measuring the dynamic modulus of roadbed according to claim 1, characterized in that: The acceleration sensor (316) and the laser Doppler rangefinder (317) measure the dynamic deformation displacement value of the detection point, and according to the load generating device (3), the dynamic load-deformation curve of the roadbed, that is, the dynamic modulus of the roadbed, can be obtained.

Images