Generating device for roadbed detection continuous load

Abstract

The invention relates to the technical field of roadbed detection, and discloses a roadbed detection continuous load generation device which comprises a fixed base, a lifting platform, a lifting transmission assembly, a dynamic load generation assembly and a plurality of static load generation assemblies. The lifting transmission assembly enables the lifting platform to ascend and descend above the fixed base, the dynamic load generating assemblies and the static load generating assemblies are both installed on the lower side of the lifting platform and penetrate through the fixed base to apply loads to a roadbed, and the static load generating assemblies are circumferentially and evenly arranged around the outer side of the dynamic load generating assembly. According to the invention, uniform and stable static loads are applied to the circumferences of the detection points and continuous and cyclic dynamic loads are applied to the detection points at the same time, so that the impact load generated by rapid passing of a traffic flow on a roadbed is simulated more truly, and more real and reliable test data 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 device for generating continuous load for roadbed detection. Background Art

[0002] As an important indicator of the bearing capacity of the roadbed, the roadbed resilience modulus is an important test item in road testing. At present, the commonly used equipment and methods for road deflection testing are mainly divided into static deflection testing and dynamic deflection testing equipment. Whether it is equipment using the Beckmann beam (BB) method or equipment using the falling weight deflectometer (FWD) method, high-frequency, continuous cyclic loads cannot be applied to a certain test point. Summary of the invention

[0003] The purpose of the present invention is to provide a device for generating continuous load for roadbed detection in order to solve the above-mentioned problems in the prior art.

[0004] To achieve the above object, the present invention provides the following technical solutions: A device for generating continuous load for roadbed detection, comprising a fixed base, a lifting platform, a lifting transmission component, a dynamic load generating component and a plurality of static load generating components; 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. In addition, a plurality of static load generating assemblies are evenly arranged in a circle around the outer side of the dynamic load generating assembly.

[0005] Furthermore, a through hole is provided in the middle of the fixed base for the dynamic load generating assembly and the static load generating assembly to pass through.

[0006] Furthermore, the lifting transmission assembly includes a reducer, a servo motor, several commutators, several couplings and several screw lifts installed on the lifting platform; the screw lift 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 several screw lifts to move synchronously through several commutators and several couplings.

[0007] 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 dynamic load loading plate floating ball joint.

[0008] Furthermore, the dynamic load generating cylinder output includes but is not limited to cyclic dynamic loads of sine waves and triangular waves; it also includes a function waveform generator, PID and a function waveform compensator. The function waveform generator outputs a standard waveform so that PID controls the output force of the dynamic load generating cylinder. The dynamic load pressure sensor detects the output force and feeds back to the function waveform compensator. The PID corrects the output force of the dynamic load generating cylinder according to the information of the function waveform compensator.

[0009] Furthermore, it also includes a static load loading plate in the shape of a circular ring, and the static load generating component is connected between the static load loading plate and the lifting platform.

[0010] Furthermore, the static load generating assembly 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.

[0011] Furthermore, the output force of the static load generating component is kept in the same state under normal conditions. When the static load pressure sensor detects that the output force of the corresponding static load generating cylinder does not match the target force, the output force of the static load generating cylinder is adjusted.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The present invention simultaneously applies a uniformly distributed, stable static load to the circumference of the detection point and a continuous, cyclic dynamic load to the detection point, which more realistically simulates the impact load on the roadbed caused by the rapid passage of traffic, and provides more realistic and reliable inspection data for evaluating the road bearing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0014] Figure 2 It is a front view schematic diagram of the present invention.

[0015] Figure 3 It is a top view schematic diagram of the present invention.

[0016] Figure 4 It is a schematic cross-sectional top view of the present invention.

[0017] Figure 5 It is a schematic diagram of the lifting transmission assembly of the present invention.

[0018] Figure 6 It is a schematic diagram of the dynamic load generating assembly of the present invention.

[0019] Figure 7 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.

[0020] Figure 8 It is a schematic diagram of the three-dimensional structure of the static load generating assembly of the present invention.

[0021] Fig. 9 It is a top view schematic diagram of the static load generating assembly of the present invention.

[0022] Fig.10 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.

[0023] Fig.11 It is a schematic diagram of the static load generating gas circuit principle of the present invention.

[0024] Fig.12 It is a schematic diagram of the dynamic load generating gas circuit principle of the present invention.

[0025] Fig.13 It is a schematic diagram of the dynamic load generation control principle of the present invention.

[0026] In the figure: 11, fixed base; 12, lifting platform; 13, lifting transmission assembly; 14, dynamic load generating assembly; 15, static load generating assembly; 21. Reducer; 22. Servo motor; 23. Reversing machine; 24. Coupling; 25. Screw lift; 31. Dynamic load generating cylinder; 32. Dynamic load pressure sensor; 33. Dynamic load force transmission rod; 34. Dynamic load connecting ball head; 35. Dynamic load floating connecting plate; 36. Dynamic load connecting ball bowl; 37. Dynamic load loading plate; 41. static load generating cylinder; 42. static load force transmission rod; 43. static load pressure sensor; 44. static load loading plate; 45. static load connecting ball head; 46. static load floating connecting plate; 47. static load connecting ball bowl; 51. Air supply solenoid valve; 52. Second solenoid reversing valve; 53. Exhaust speed regulating valve; 54. Exhaust solenoid valve; 55. Air supply speed regulating valve; 61. The first electromagnetic reversing valve; 62. The throttling speed regulating valve. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] The specific embodiment of the device for generating continuous load for roadbed detection provided by the present invention is as follows: See also Figure 1-13 The device for generating continuous load for roadbed detection includes a fixed base 11, a lifting platform 12, a lifting transmission assembly 13, a dynamic load generating assembly 14 and a static load generating assembly 15; the lifting platform 12 is located above the fixed base 11. The fixed base 11 is installed on an external device, which is a gravity force application device with a certain weight, and can be a self-moving device or a non-self-moving device. In order to improve the authenticity of roadbed detection, the external device in this embodiment preferably adopts a load-bearing vehicle.

[0032] The lifting transmission assembly 13 is mainly arranged on the upper side of the lifting platform 12, the dynamic load generating assembly 14 and the static load generating assembly 15 are installed and arranged on the lower side of the lifting platform 12, and several static load generating assemblies 15 are located outside the dynamic load generating assembly 14 and are evenly distributed around the circumference.

[0033] The lifting transmission assembly 13 includes a reducer 21, a servo motor 22, a plurality of commutators 23, a plurality of couplings 24, and a plurality of screw lifters 25. The servo motor 22 is connected to the input end of the reducer 21 as a prime mover, the output end of the reducer 21 is connected to the input end of the commutator 23 arranged at the middle position on the upper side of the lifting platform 12 through the coupling 24, the output end of the commutator 23 at the middle position is connected to the input end of the commutator 23 arranged at the two sides of the lifting platform 12 through the coupling 24, and the output ends of the commutators 23 at the two sides are respectively connected to the input ends of the screw lifters 25 arranged at the four corners of the lifting platform 12 through the coupling 24. The lifting transmission assembly 13 controls the four screw elevators 25 arranged on the lifting platform 12 to work simultaneously through a servo motor 22, driving the lifting platform 12 and the dynamic load generating assembly 14 and the static load generating assembly 15 installed on the lower plane of the lifting platform 12 to rise and fall synchronously and smoothly; to facilitate the inspection and maintenance of the reversing machine 23 and the screw elevator 25, the coupling 24 used to connect the reversing machine 23 and the screw elevator 25 adopts a roller chain coupling.

[0034] The screw of the screw lift 25 passes through the lifting platform 12, and a flange is provided at the bottom of the screw of the screw lift 25. The flange provided at the bottom of the screw lift 25 is fixed on the fixed base 11; a circular through hole is provided in the middle of the fixed base 11, and the screw lift 25 is arranged around the circular through hole, and the dynamic load generating assembly 14 and the static load generating assembly 15 correspond to the circular through hole. A plurality of mounting ears with mounting holes are provided on the edge of the fixed base 11, and the fixed base 11 can be mounted on the load-bearing vehicle by bolts using the mounting ears.

[0035] The dynamic load generating assembly 14 includes a dynamic load generating cylinder 31, a dynamic load pressure sensor 32, a dynamic load force transmission rod 33, a dynamic load connecting ball head 34, a dynamic load floating connecting plate 35, a dynamic load connecting ball bowl 36 and a dynamic load loading plate 37. In the present invention, the dynamic load generating assembly 14 is installed at the middle position of the lower side of the lifting platform 12, the dynamic load loading plate 37 is a disc-shaped structure, the dynamic load loading plate 37 is connected to the dynamic load force transmission rod 33 by a floating ball joint, and the dynamic load pressure sensor 32 feeds back a pressure signal to adjust the output force of the dynamic load generating cylinder 31.

[0036] Specifically, the dynamic load loading plate 37 is a disc-shaped structure, the dynamic load loading plate 37 is bolted to the dynamic load connecting ball bowl 36, the dynamic load connecting ball bowl 36 is connected to the ball end ball joint of the dynamic load connecting ball head 34 through the dynamic load floating connecting plate 35, the rod end of the dynamic load connecting ball head 34 is connected to the lower end of the dynamic load force transmission rod 33, the upper end of the dynamic load force transmission rod 33 is connected to the lower end of the dynamic load pressure sensor 32, the upper end of the dynamic load pressure sensor 32 is connected to the piston rod of the dynamic load generating cylinder 31, and the dynamic load generating cylinder 31 is installed in the middle position of the lower plane of the lifting platform 12. Through the above structure, the dynamic load loading plate 37 is connected to the dynamic load force transmission rod 33 in a floating manner, and the force output by the dynamic load generating cylinder 31 is applied to the roadbed detection point through the dynamic load loading plate 37.

[0037] In the control air circuit of the dynamic load generating cylinder 31, there are a first electromagnetic reversing valve 61 and a throttling speed regulating valve 62; the first electromagnetic reversing valve 61 is connected to the air storage tank through an air pipe, and the first electromagnetic reversing valve 61 is connected to the rodless cavity of the dynamic load generating cylinder 31 through an air pipe; the rod cavity of the dynamic load generating cylinder 31 and the first electromagnetic reversing valve 61 are both connected to the throttling speed regulating valve 62 through an air pipe.

[0038] The gas storage tank stores continuous and stable compressed gas. When one side of the first electromagnetic reversing valve 61 is energized, the rodless chamber of the dynamic load generating cylinder 31 is inflated and the rod chamber is exhausted. The exhaust flow rate of the rod chamber of the dynamic load generating cylinder 31 is adjusted by the throttling speed regulating valve 62 to control the extension speed of the piston rod. The above action outputs a force on the roadbed detection point, and the roadbed produces downward elastic deformation. When the other side of the first electromagnetic reversing valve 61 is energized, the rodless chamber and the rod chamber of the dynamic load generating cylinder 31 are exhausted. The exhaust flow rate is adjusted by the throttling speed regulating valve 62 to control the retraction speed of the piston rod. With the above action, the elastic deformation of the roadbed is restored and the piston cylinder of the dynamic load generating cylinder 31 is pushed upward. The two sides of the first electromagnetic reversing valve 61 are alternately energized at a certain frequency, and the dynamic load generating cylinder 31 extends and retracts at the set frequency, thereby generating a continuous cyclic dynamic load on the roadbed.

[0039] The gas pressure in the dynamic load generating cylinder 31 = temperature coefficient × gas volume at normal pressure / cylinder volume. The gas flow rate and direction are controlled by the throttling speed regulating valve 62 or the proportional solenoid valve 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 31 output a stable and regular cyclic dynamic load, the dynamic load generating cylinder 31 is controlled. The control principle is as follows: Fig.13, including a function waveform generator, PID, and a function waveform compensator. The function waveform generator outputs a standard waveform to drive the PID control actuator, i.e., the dynamic load generating cylinder 31 to output, and the output force is fed back to the function waveform compensator by the force sensor, i.e., the dynamic load pressure sensor 32, and the PID control part corrects and controls the actuator to achieve accurate output of cyclic dynamic loads including but not limited to sine waves, triangular waves, etc.

[0040] In this embodiment, a static load loading plate 44 and several static load generating components 15 are included; the static load generating component 15 includes a static load generating cylinder 41, a static load force transmission rod 42, a static load pressure sensor 43, a static load connecting ball head 45, a static load floating connecting plate 46 and a static load connecting ball bowl 47. In the present invention, the static load generating component 15 is installed on the lower side of the lifting platform 12, and the static load loading plate 44 is a circular ring structure. Three to four circumferentially evenly distributed static load application points, namely the static load generating component 15, can be set on the static load loading plate 44. At each static load application point, the static load loading plate 44 is connected to the static load generating component 15 by a floating ball joint. Each static load application point is provided with a static load pressure sensor 43, and the static load pressure sensor 43 feeds back a pressure signal to adjust the output force of the static load generating cylinder 41.

[0041] Specifically, the static load loading plate 44 adopts a circular plate structure. In this embodiment, three static load application points are evenly arranged on the static load loading plate 44, and each static load application point includes: a static load generating cylinder 41, a static load force transmission rod 42, a static load pressure sensor 43, a static load connecting ball head 45, a static load floating connecting plate 46, and a static load connecting ball bowl 47; in some other embodiments, the static load application points can be four. The piston rod of the static load generating cylinder 41 is connected to the upper end of the static load force transmission rod 42, the lower end of the static load force transmission rod 42 is connected to the upper end of the static load pressure sensor 43, the lower end of the static load pressure sensor 43 is connected to the rod end of the static load connecting ball head 45, the ball end of the static load connecting ball head 45 is connected to the static load connecting ball bowl 47 through the static load floating connecting plate 46 in a ball-jointed manner, and the bottom surface of the static load connecting ball bowl 47 is bolted to the static load loading plate 44, and the static load generating cylinder 41 is installed on the lower plane of the lifting platform 12. Through the above connection form, the static load loading plate 44 is floatingly connected to the static load generating assembly 15, and the force output by the static load generating cylinder 41 is applied to the circumferential area of ​​the roadbed detection point through the static load loading plate 44.

[0042] The control gas circuit of the static load generating cylinder 41 includes an air supply solenoid valve 51, a second solenoid reversing valve 52, an exhaust speed regulating valve 53, an exhaust solenoid valve 54 and an air supply speed regulating valve 55. The second solenoid reversing valve 52 is connected to the air storage tank through an air pipe, and the second solenoid reversing valve 52 is respectively connected to the rodless cavity and the rod cavity of the static load generating cylinder 41 through two air pipes; the rodless cavity of the static load generating cylinder 41 is also connected to an exhaust air pipe and an air supply air pipe, the exhaust speed regulating valve 53 and the exhaust solenoid valve 54 are installed on the exhaust air pipe, the air supply speed regulating valve 55 and the air supply solenoid valve 51 are installed on the air supply air pipe, and the air supply air pipe is connected to the air source.

[0043] The gas tank stores continuous and stable compressed gas. The static load includes three load application points that are evenly distributed along the circumference and have the same force direction. The gas path at each load application point includes a static load generating cylinder 41, a second electromagnetic reversing valve 52, an air supply electromagnetic valve 51, an air supply speed regulating valve 55, an exhaust electromagnetic valve 54, and an exhaust speed regulating valve 53. The second electromagnetic reversing valves 52 at the three load application points are energized at the same time, the rodless cavity of the static load generating cylinder 41 is inflated and the rod cavity is exhausted. The three load application points output forces at the same time, and when the output forces are the same, a uniformly distributed static load is generated on the roadbed. When the output force of a static load generating cylinder 41 deviates from the target force due to vibration or deviation of the center of gravity during the process of applying a dynamic load, taking a certain load application point as an example, at this time, the static load generating cylinder 41 outputs the force, and the second electromagnetic reversing valve 52 is in a power-off state. When the output force of the static load generating cylinder 41 is greater than the target force, the exhaust solenoid valve 54 is energized, and the exhaust speed regulating valve 53 is used to control the deflation speed of the rodless chamber of the static load generating cylinder 41. After the rodless chamber is slowly deflated, the output force of the static load generating cylinder 41 is reduced to the target force, and the exhaust solenoid valve 54 is powered off; when the output force of the static load generating cylinder 41 is less than the target force, the air supply solenoid valve 51 is energized, and the air supply speed regulating valve 55 is used to control the air supply speed to the rodless chamber of the static load generating cylinder 41. After the rodless chamber is slowly replenished, the output force of the static load generating cylinder 41 rises to the target force, and the air supply solenoid valve 51 is powered off. Through the above-mentioned dynamic exhaust and air replenishment process, the rodless chamber of the static load generating cylinder 41 maintains the same force at the three static load application points, thereby generating a stable and uniform static load on the roadbed. The other end of the second electromagnetic reversing valve 52 is energized, the rod chamber of the static load generating cylinder 41 is inflated and the rodless chamber is exhausted, and the piston rod of the static load generating cylinder 41 is retracted. In some embodiments, a controller is also included, and the controller controls the air circuit 41 of the static load generating cylinder according to the pressure information detected by the static load pressure sensor 43.

[0044] The present invention adopts a pneumatic method and uses the deadweight of the load-bearing vehicle to apply continuous dynamic load and uniform static load to the roadbed. The dynamic load generating assembly 14 and the static load generating assembly 15 are installed and arranged on the same lifting platform 12. The dynamic load generating assembly 14 is located in the middle of the lifting platform 12, and the static load generating assembly 15 is uniformly distributed in a circle relative to the dynamic load generating assembly 14. During implementation, the generating device for the continuous load of the roadbed detection is installed on the load-bearing vehicle through the fixed base 11, and the implementation process of applying continuous cyclic load to the roadbed detection point is as follows: 1. The servo motor 22 in the continuous load generating device drives the screw lift 25 to drive the lifting platform 12 to descend at the maximum speed, and stops after descending to the set position, and the dynamic load generating component 14 and the static load generating component 15 descend together with the lifting platform 12; 2. The three static load generating cylinders 41 in the static load generating assembly 15 extend out, and the static load loading plate 44 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 bearing vehicle. The static load pressure sensor 43 measures the magnitude of the output force of each static load generating cylinder 41, and adjusts the inflation or exhaust action of the output chamber of the static load generating cylinder 41 according to the magnitude of the output force of the static load generating cylinder 41 fed back by each static load pressure sensor 43, that is, when a static load pressure sensor 43 feeds back that the output force of the static load generating cylinder 41 is greater than the set pressure value, the corresponding static load generating cylinder 41 needs to be controlled to exhaust slowly, and vice versa. Control the inflation of the corresponding static load generating cylinder 41, so that the output force of each static load generating cylinder 41 is always maintained at the set value, generating a uniformly distributed and stable static load around the detection point; The initial extension length of the piston rod of the static load generating cylinder 41 is one-half or about one-half of the stroke, leaving a stroke margin when the static load generating cylinder 41 is inflated or exhausted; 3. The lifting platform 12 continues to descend at a slow speed. When the dynamic load pressure sensor 32 detects a pressure signal, the dynamic load loading plate 37 contacts the roadbed surface. The reaction force generated by the vehicle's own weight is used to control the dynamic load generating cylinder 31 to extend the inflatable piston rod, output the force to the detection point, and the roadbed is elastically deformed. The dynamic load generating cylinder 31 is controlled to exhaust, the elastic deformation of the roadbed is restored, and the piston rod of the dynamic load generating cylinder 31 is retracted; The dynamic load generating cylinder 31 is controlled to inflate and exhaust at a certain frequency, and the piston rod of the dynamic load generating cylinder 31 continuously extends and retracts, thereby applying a continuous dynamic load to the detection point; 4. After the inspection work is completed, the lifting platform 12 is raised and the static load generating cylinder 41 is retracted.

[0045] The present invention is mainly used for the construction inspection of roadbed, base layer and surface layer and the detection and evaluation of road damage, and can efficiently provide a test report on the bearing capacity of the road surface. In order to meet the measurement requirements of different structural layers, a road surface constraint device is created in combination with the characteristics of the structural layer to achieve the application of static load of the outer ring and continuous dynamic load of the inner ring loading device. The static load pressure of the outer ring is adjustable (to simulate the restraining effect of the upper structural layer overlying the different structural layers on it), and the continuous dynamic load waveform, frequency and amplitude of the inner ring are adjustable (corresponding speed limit standards and load-bearing standards for different grades of highways, simulating various real road conditions).

[0046] The present invention meets the different loading conditions of the inner and outer rings on the basis of structural miniaturization, and at the same time reserves sufficient cavity volume for the outer ring static load generating cylinder 41 to weaken the influence of continuous dynamic load on the static load generating cylinder 41. The basic principle of this part is to select the stroke of the static load generating cylinder 41 and the dynamic load generating cylinder 31 and adjust the length of the force transmission rod so that when the static load loading plates 44 of the inner and outer rings are flush with the ground, the stroke range of the static load generating cylinder 41 can completely cover the stroke of the dynamic load generating cylinder 31 and has a large adjustment margin.

[0047] In addition, in the present embodiment, the generation of continuous load is realized by using cylinders as power. In some embodiments, the generation of continuous load can be realized by using, including but not limited to, hydraulic cylinders and electric servo cylinders instead of cylinders.

[0048] 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 device for generating continuous load for roadbed detection, characterized in that: It comprises a fixed base (11), a lifting platform (12), a lifting transmission component (13), a dynamic load generating component (14) and a plurality of static load generating components (15); The lifting transmission assembly (13) enables the lifting platform (12) to be lifted and lowered above the fixed base (11); the dynamic load generating assembly (14) and the static load generating assembly (15) are both installed on the lower side of the lifting platform (12) and pass through the fixed base (11) to apply load to the roadbed; and a plurality of static load generating assemblies (15) are evenly arranged in a circle around the outer side of the dynamic load generating assembly (14).

2. The device for generating continuous load for roadbed detection according to claim 1, characterized in that: A through hole is provided in the middle of the fixed base (11) for the dynamic load generating component (14) and the static load generating component (15) to pass through.

3. The device for generating continuous load for roadbed detection according to claim 1, characterized in that: The lifting transmission assembly (13) comprises a reducer (21), a servo motor (22), a plurality of commutators (23), a plurality of couplings (24) and a plurality of screw lifts (25) installed on the lifting platform (12); the screw lifts (25) are installed on the edge of the lifting platform (12), and their screws are connected to the fixed base (11); the output end of the servo motor (22) is connected to the input end of the reducer (21), and the output end of the reducer (21) drives the plurality of screw lifts (25) to move synchronously through the plurality of commutators (23) and the plurality of couplings (24).

4. The device for generating continuous load for roadbed detection according to claim 1, characterized in that: The dynamic load generating assembly (14) comprises a dynamic load generating cylinder (31), a dynamic load pressure sensor (32), a dynamic load force transmission rod (33) and a dynamic load loading plate (37); the dynamic load generating cylinder (31) is installed on the lower side of the middle part of the lifting platform (12); the dynamic load pressure sensor (32) is connected between the dynamic load generating cylinder (31) and the dynamic load force transmission rod (33); the lower end of the dynamic load force transmission rod (33) is connected to the dynamic load loading plate (37) by a floating ball joint.

5. The device for generating continuous load for roadbed detection according to claim 4, characterized in that: The dynamic load generating cylinder (31) outputs a cyclic dynamic load including but not limited to a sine wave and a triangular wave; and further includes a function waveform generator, a PID and a function waveform compensator. The function waveform generator outputs a standard waveform so that the PID controls the output force of the dynamic load generating cylinder (31). The dynamic load pressure sensor (32) detects the output force and feeds back to the function waveform compensator. The PID corrects the output force of the dynamic load generating cylinder (31) according to the information of the function waveform compensator.

6. The device for generating continuous load for roadbed detection according to claim 1, characterized in that: It also includes a static load loading plate (44) in the shape of a circular ring, and a static load generating component (15) is connected between the static load loading plate (44) and the lifting platform (12).

7. The device for generating continuous load for roadbed detection according to claim 6, characterized in that: The static load generating assembly (15) comprises a static load generating cylinder (41), a static load force transmission rod (42) and a static load pressure sensor (43); the static load generating cylinder (41) is installed on the lower side of the lifting platform (12), the static load force transmission rod (42) is connected between the static load generating cylinder (41) and the static load pressure sensor (43), and the lower side of the static load pressure sensor (43) is connected to a static load loading plate (44) by a floating ball joint.

8. The device for generating continuous load for roadbed detection according to claim 7, characterized in that: The output force of the static load generating component (15) remains in the same state under normal conditions, and when the static load pressure sensor (43) detects that the output force of the corresponding static load generating cylinder (41) does not match the target force, the output force of the static load generating cylinder (41) is adjusted.

Images