A vibration testing apparatus and method

Abstract

The application relates to the technical field of road roller testing, and discloses a vibration testing device, a testing workbench comprising: an adaptive adjusting assembly arranged in a frame body and used for self-adaptingly adjusting the testing workbench for different road roller models; two groups of load simulation debugging assemblies arranged in the frame body and used for supporting steel wheels of the road roller and simulating different use road conditions of the road roller; and a limiting assembly. The vibration testing is directly carried out on the indoor debugging workbench, the debugging can be carried out throughout the year without being affected by any weather, the probability of appearance damage of the indoor debugging machine is greatly reduced, the process control is programmed, human factors are eliminated, one person can debug multiple machines, the debugging efficiency is improved by multiple times, the dynamic characteristics of real working conditions are restored, and fault simulation testing is realized through a multidirectional damping system assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of road roller testing, in particular to a vibration testing device and method. BACKGROUND

[0002] As a core equipment for road construction, the reliability of the vibration system of a road roller directly affects the compaction effect and service life.

[0003] The factory debugging method commonly used in the industry has the following problems:

[0004] 1. Site dependence: traditional debugging needs to be carried out in an outdoor site, which is greatly affected by weather and ground conditions, and the debugging period is long. For example, work needs to be stopped when it rains.

[0005] 2. Manual experience: debugging parameters depend on the experience of engineers for manual adjustment, which has poor consistency and easily leads to fluctuations in equipment performance.

[0006] 3. Incomplete testing: it is impossible to truly simulate the running state of a road roller in different use scenarios.

[0007] 4. Safety risks: mechanical structure abnormalities under high-frequency vibration, such as loose bolts and cracked welds, are difficult to expose in no-load operation, which poses a safety hazard after leaving the factory. SUMMARY

[0008] Technical problems solved

[0009] To address the deficiencies of the prior art, the present application provides a vibration testing device and method, which mainly solves the problems of site dependence, manual experience, incomplete testing, and safety risks.

[0010] Technical solutions

[0011] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0012] A vibration testing device includes a factory building, at least three test station tables are arranged in the factory building, double-acting roll-up doors are arranged on both sides of the factory building to allow access to the test station tables, the test station tables include a frame body arranged inside the ground of the factory building, a patterned floor is arranged on the test station tables and is flush with the ground, and the test station tables further include:

[0013] An adaption and adjustment component is provided inside the frame and is used to adaptively adjust the test station to different roller models;

[0014] Two sets of load simulation and debugging components, both of which are arranged inside the frame and support the steel wheels of the roller and simulate different road conditions for the roller;

[0015] A limit assembly is provided above and around the test station and effectively limits the position of the roller when it is being tested inside the test station;

[0016] A multi-directional damping system assembly, wherein the multi-directional damping system can be detachably mounted in a test station and used to perform fault simulation tests on the steel wheel of the roller;

[0017] The data acquisition system component can be detachably installed in the test station and collects various data during the test of the roller steel wheel.

[0018] Furthermore, the adaptation and adjustment component includes two groups of double guide rail frames, both groups of double guide rail frames are fixedly connected to the inside of the frame body, and two adjustment frames are slidably connected between the two groups of double guide rail frames through multiple groups of slides. Both sides of the two adjustment frames are fixedly connected to drive motors, and one end of the output shaft of the drive motor is keyed to a gear. Racks are fixedly connected to the inside of the two groups of double guide rail frames, and the racks are meshed with the gears.

[0019] On the basis of the above scheme, the load simulation debugging component includes two nonlinear stiffness model rollers, both of which are rotatably connected to the adjustment frame through bearing seats, brake discs are fixed at the middle position of the two nonlinear stiffness model rollers, and two brake calipers are fixedly connected to the top of the adjustment frame for braking the two brake discs respectively, and a support component for supporting the steel wheel of the roller is provided between the two nonlinear stiffness model rollers.

[0020] As a further solution of the present invention, the nonlinear stiffness model roller is a nonlinear stiffness model that supports multi-media simulation of asphalt, sand and gravel, and concrete based on Hertz contact theory.

[0021] Further, the support assembly comprises a plurality of support oil cylinders, the plurality of support oil cylinders are fixedly connected at the top of the two adjusting frames respectively, one end of the piston rod of the support oil cylinder on the same side is fixedly connected with a support table, the two support tables are located between the two non-linear stiffness model rollers of the two load simulation debugging assemblies respectively, a plurality of laying grooves are arranged on the top of the frame body, and a plurality of detachable laying plates for avoiding the non-linear stiffness model rollers are arranged in the laying grooves, the detachable laying plates are steel plates, the two ends of the steel plate are fixedly connected with the embedded blocks which can be inserted into the laying grooves, and the top of the support table is in the same horizontal plane with the non-linear stiffness model rollers, the detachable laying plates and the pattern laying plates.

[0022] On the basis of the foregoing scheme, the multi-directional damping system assembly comprises a vertical damping group, a horizontal damping group and a longitudinal damping group, and the damping force is dynamically adjusted through a hydraulic servo valve, the vertical damping group, the horizontal damping group and the longitudinal damping group are detachably installed in a test work station table, the vertical damping group comprises four groups of vertical hydraulic cylinders arranged at equal distances and directly acting on a platform below a steel wheel of a road roller, the horizontal damping group comprises two groups of horizontal hydraulic cylinders arranged transversely and installed on guide rails on both sides of the steel wheel to suppress lateral swinging, and the longitudinal damping group comprises two groups of horizontal hydraulic cylinders arranged longitudinally and installed in front of the steel wheel to simulate travel resistance.

[0023] As a further scheme of the application, the hydraulic servo valve is a high-frequency proportional servo valve with a frequency response ≥100 Hz, and the damping force of the multi-directional damping system assembly is dynamically calculated according to a material characteristic model, and satisfies the formula:

[0024] F=C·v n +K· x

[0025] C is a viscous damping coefficient, v is the speed of the steel wheel, n is a nonlinear index, K is an equivalent stiffness coefficient, and x is a displacement amount.

[0026] Further, the data acquisition system assembly comprises a six-dimensional force sensor, a laser displacement sensor, a pressure transmitter and an infrared thermal imager, the six-dimensional force sensor is installed on a contact surface between the steel wheel and the platform to monitor the resultant force in each direction in real time, the laser displacement sensor is installed on both sides of the test work station table, the pressure transmitter is installed in a hydraulic system of the multi-directional damping system assembly to monitor the pressure difference between the inlet and the outlet of the hydraulic cylinder and to close-loop control the damping force, and the infrared thermal imager is installed on the side of the steel wheel of the road roller to monitor the bearing temperature of the steel wheel of the road roller.

[0027] On the basis of the foregoing scheme, the position limiting assembly comprises an upper support fixedly connected to the top of the patterned pavement slab, two rails fixedly connected to the top of the upper support, a sliding table slidingly connected between the two rails, a sliding frame hinged to one side of the sliding table through a mounting seat, a turnover frame rotatably connected to the end of the turnover frame through a bearing, two turnover oil cylinders hinged to one side of the sliding frame, with the end of the piston rod of the turnover oil cylinder rotatably connected to the turnover frame, two mounting frames fixedly connected to the top of the upper support, a servo motor fixedly connected to the top of the upper support at each corner, with a synchronous pulley provided at the inside of the mounting frame and at the end of the output shaft of the servo motor, the end of the output shaft of the servo motor and the two synchronous pulleys in the mounting frame being drivingly connected through a synchronous belt, and the plurality of synchronous belts being fixed to the sliding table provided on the rails, a plurality of fences fixedly connected to the top of the patterned pavement slab around the test station, and a detachable steel chain hung between adjacent fences, the detachable steel chain forming an enclosed state for the test station.

[0028] A test method of a vibration test device, comprising the following steps:

[0029] S1: first, confirm the model of the road roller, then start the driving motor, the driving motor rotates to drive the gear to rotate, since the gear is engaged with the rack, the gear rotates and moves along the rack at the same time, so that the distance between the two adjusting frames is adjusted, at this time, the detachable pavement slab is clamped into the laying groove through the embedding block, thereby completing the laying of the detachable pavement slab, and the laid detachable pavement slab not only can support the walking of the road roller, but also can effectively avoid the two groups of nonlinear stiffness model rollers, thereby completing the adaptation of the test station;

[0030] S2: since the top of the support is at the same horizontal plane as the nonlinear stiffness model roller, the detachable pavement slab and the patterned pavement slab, when the road roller arrives at the test station, the steel wheels of the road roller can be supported by the two supports, until the steel wheels move between the two nonlinear stiffness model rollers, the support oil cylinder is shortened to drive the support to move downward, so that the road roller and the steel wheels move downward at the same time, until the steel wheels contact the two nonlinear stiffness model rollers and are effectively supported by the two nonlinear stiffness model rollers, at this time, the steel wheels are out of the supporting state with the support, thereby completing the rapid adaptation of the steel wheels of the road roller and the falling of the steel wheels of the road roller into the test station.

[0031] S3: Then, the data acquisition system components are installed. The six-dimensional force sensor is installed on the contact surface between the steel drum and the platform to monitor the resultant force in all directions in real time. The laser displacement sensor is installed on both sides of the test station. The pressure transmitter is installed in the hydraulic system of the multi-directional damping system component to monitor the inlet and outlet pressure difference of the hydraulic cylinder and close the damping force. The infrared thermal imager is installed on the side of the roller steel drum to monitor the bearing temperature of the roller steel drum. This enables accurate online measurement of various data during the roller vibration test.

[0032] S4: Then, the multi-directional damping system components are adapted and installed. Four sets of equidistantly arranged vertical hydraulic cylinders act directly on the platform below the roller's steel drum, forming the vertical damping group. Two sets of transversely arranged horizontal hydraulic cylinders are installed on the guide rails on both sides of the steel drum to suppress lateral swing, forming the transverse damping group. Two sets of longitudinally arranged horizontal hydraulic cylinders are installed in front of the steel drum to simulate travel resistance, forming the longitudinal damping group.

[0033] S5: Then, perform a no-load frequency sweep test, run the self-test program under load, and reciprocate the vertical damping group through the full stroke to verify the displacement-pressure linearity; apply a step force to the lateral damping group to test the response time;

[0034] S6: After the no-load sweep frequency test is completed, load debugging is carried out and a debugging mode is selected, such as the sand and gravel simulation mode. In this case, the nonlinear stiffness model roller supports asphalt medium simulation based on the Hertz contact theory.

[0035] S7: Then the roller vibration motor is started to perform a vibration test. At this time, the data acquisition system components complete the accurate online measurement of various data during the vibration test;

[0036] S8: Fault simulation tests are then conducted, such as bolt loosening simulation, which requires reducing pressure through the vertical damping group to simulate steel wheel fixation failure; eccentric block imbalance simulation, in which the lateral damping group applies periodic alternating force to simulate eccentric block phase deviation; and road surface roughness simulation, in which the longitudinal damping group outputs random fluctuating resistance. The random fluctuating resistance needs to generate an excitation signal based on the ISO 8608 road surface spectrum to verify the roller system alarm threshold.

[0037] S9: After debugging is completed, a debugging report is generated and uploaded to the cloud database.

[0038] Beneficial effects

[0039] Compared with the prior art, the present invention provides a vibration testing device and a testing method, which have the following beneficial effects:

[0040] 1. The present invention directly conducts vibration testing on an indoor debugging table, which is not affected by any weather and can be debugged all year round. The probability of damage to the appearance of the machine during indoor debugging is greatly reduced. Due to the procedural control of the process, human factors are eliminated, and one person can debug multiple machines, which improves the debugging efficiency many times. At the same time, the debugging time of a single machine can be reduced by more than 20%.

[0041] 2. The present invention restores the dynamic characteristics of real working conditions. For example, the nonlinear stiffness model roller is a nonlinear stiffness model based on Hertz contact theory that supports multi-media simulation of asphalt, sand and gravel, and concrete, thereby completing the simulation restoration of different working conditions.

[0042] 3. The present invention adjusts the distance between the two adjustment frames through the adaptive adjustment component, and the detachable deck after laying can not only complete the walking support of the roller, but also form an effective avoidance position for the two sets of nonlinear stiffness model rollers, thereby completing the adaptation of the test bench and completing the effective support of the roller steel wheel when it walks to the test station through the support component.

[0043] 4. The present invention realizes accurate online measurement of various data of the roller during vibration testing by installing data acquisition system components, such as six-dimensional force sensor, laser displacement sensor, pressure transmitter and infrared thermal imager.

[0044] 5. The present invention implements fault simulation testing through multi-directional damping system components, such as bolt loosening simulation, eccentric block imbalance simulation, and road surface unevenness simulation, to verify the alarm threshold of the roller system.

[0045] 6. The present invention uses a limiting component to move the pressing roller to a specified position according to different roller models, and enables the pressing roller set at the end of the turning frame to press and limit the steel wheel of the roller from the upper side, thereby limiting the position of the roller and effectively preventing the roller from running away from the test station during the test. In addition, due to the provision of a fence and a detachable steel chain, double protection is formed for the roller during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A test flow diagram of a test method for vibration testing equipment proposed by the present invention;

[0047] Figure 2 This is a schematic diagram of the front three-dimensional structure of a vibration testing device proposed by the present invention;

[0048] Figure 3 A vibration testing device proposed by the present invention Figure 2 Schematic diagram of the internal structure;

[0049] Figure 4 This is a structural diagram of a test station for a vibration testing device proposed by the present invention;

[0050] Figure 5 A vibration testing device proposed by the present invention Figure 4 Schematic diagram of a local enlarged structure;

[0051] Figure 6 A vibration testing device proposed by the present invention Figure 5 Schematic diagram of the local explosion structure;

[0052] Figure 7 A schematic diagram of a detachable deck structure of a vibration testing device proposed in the present invention;

[0053] Figure 8 This is a schematic structural diagram of a support assembly of a vibration testing device proposed by the present invention;

[0054] Figure 9 This is a schematic structural diagram of a limit assembly of a vibration testing device proposed by the present invention.

[0055] Figure 1: 1. Workshop; 2. Test station; 3. Patterned deck; 4. Positioning assembly; 401. Upper bracket; 402. Turning cylinder; 403. Turning frame; 404. Pressing roller; 405. Mounting seat; 406. Slide; 407. Mounting frame; 408. Track; 409. Synchronous belt; 410. Synchronous pulley; 411. Servo motor; 5. Fence; 6. Removable steel chain; 7. Frame; 8. Removable deck ;801, insert; 802, steel plate; 9, laying trough; 10, load simulation debugging component; 1001, nonlinear stiffness model roller; 1002, brake disc; 1003, adjustment frame; 1004, brake caliper; 11, support assembly; 1101, support platform; 1102, support cylinder; 12, adaptation adjustment assembly; 1201, drive motor; 1202, gear; 1203, rack; 1204, double guide frame. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0057] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention include direct and indirect connections (couplings) unless otherwise specified. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0058] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0059] Reference Figures 1-9 A vibration testing device includes a factory building 1, wherein at least three test stations 2 are provided in the factory building 1. Rolling shutter doors for two-way access to the test stations 2 are provided on both sides of the factory building 1. The test stations 2 include a frame 7, which is provided inside the floor of the factory building 1. The test stations of the test stations 2 are paved with patterned planks 3 and are flush with the floor. The test stations 2 also include:

[0060] The adaptive adjustment component 12 is arranged inside the frame 7 and adaptively adjusts the test station 2 according to different roller models;

[0061] Two sets of load simulation and debugging components 10, both of which are arranged inside the frame 7 and support the steel wheels of the roller and simulate different road conditions for the roller;

[0062] The limit assembly 4 is provided above and around the test station 2 and effectively limits the roller when it is being tested inside the test station 2;

[0063] Multi-directional damping system components, the multi-directional damping system can be detachably installed in the test station 2, and perform fault simulation tests on the steel wheel of the roller;

[0064] Data acquisition system components, the data acquisition system can be detachably installed in the test station table 2 and each data acquisition for the data acquisition of the steel wheel test of the road roller.

[0065] The adaptive adjusting assembly 12 in the application comprises two sets of double guide rails 1204, both of which are fixed in the inside of the frame body 7 through bolts, and two adjusting frames 1003 are slidably connected between the two sets of double guide rails 1204 through a plurality of slide tables, both sides of the two adjusting frames 1003 are fixed with driving motors 1201 through bolts, one end of the output shaft of the driving motor 1201 is keyed connected with a gear 1202, both inside the two sets of double guide rails 1204 are fixed with a rack 1203 through bolts, and the rack 1203 is engaged with the gear 1202, by starting the driving motor 1201, the driving motor 1201 rotates to drive the gear 1202 to rotate, since the gear 1202 is engaged with the rack 1203, therefore, the gear 1202 rotates at the same time and moves along the rack 1203, so that the distance between the two adjusting frames 1003 is adjusted, and different models of road rollers are adapted.

[0066] The load simulation debugging assembly 10 in the application comprises two nonlinear stiffness model rollers 1001, both of which are rotatably connected to the adjusting frame 1003 through a bearing seat, the middle part of both of the two nonlinear stiffness model rollers 1001 is fixed with a brake disc 1002, the top of the adjusting frame 1003 is fixed with two brake calipers 1004 through bolts, which brake the two brake discs 1002 respectively, a supporting assembly 11 for supporting the steel wheel of the road roller is arranged between the two nonlinear stiffness model rollers 1001, the nonlinear stiffness model roller 1001 is a nonlinear stiffness model based on Hertz contact theory, which realizes the simulation of multiple media such as asphalt, gravel and concrete;

[0067] The Hertz contact theory describes the stress and deformation relationship of two elastic bodies in the contact area, and the contact force

[0068] The relationship between F and the contact deformation δ is:

[0069] F=kδ 3 / 2

[0070] Wherein, k is the contact stiffness coefficient, which depends on the material properties and geometric shape;

[0071] For multiple media (such as asphalt, gravel and concrete), the nonlinear stiffness model can be expressed as:

[0072] F=k n δ n

[0073] Wherein, k n is a nonlinear stiffness coefficient, and n is a nonlinear index (n=3 / 2 in Hertz theory)

[0074] Asphalt: elastic modulus E1, Poisson's ratio ν1;

[0075] Sand and gravel: elastic modulus E1, Poisson's ratio ν1;

[0076] Concrete: elastic modulus E1, Poisson's ratio ν1;

[0077] For the contact between two media, the contact stiffness coefficient k can be calculated by the equivalent elastic modulus E * and the equivalent radius R * calculate:

[0078]

[0079] In numerical simulation, the nonlinear stiffness model can be implemented by the following steps:

[0080] 1. Contact detection: determine the contact area and deformation δ;

[0081] 2. Contact force calculation: According to F = k n δ n Calculate contact forces;

[0082] 3. Force and displacement update: Apply contact force to the contact body, update displacement and deformation,

[0083] At the same time, the model can be verified through experimental data (such as indentation tests) and parameters can be adjusted to improve accuracy.

[0084] The support assembly 11 in the present invention includes a plurality of support cylinders 1102, and the plurality of support cylinders 1102 are respectively fixed to the top of the two adjustment frames 1003 by bolts. One end of the piston rod of the plurality of support cylinders 1102 on the same side is fixed with a support platform 1101 by bolts. The two support platforms 1101 are respectively located between the two nonlinear stiffness model rollers 1001 of the two load simulation debugging components 10. A plurality of laying grooves 9 are opened on both sides of the top of the frame 7. A plurality of detachable laying plates 8 for avoiding the nonlinear stiffness model rollers 1001 are laid in the laying grooves 9. The detachable laying plates 8 are steel plates 802. Both ends of the steel plates 802 are welded with inserts 801 that can be inserted into the laying grooves 9. Since the support platform 11 The top of 01 is on the same horizontal plane as the nonlinear stiffness model roller 1001, the detachable deck 8 and the patterned deck 3. Therefore, when the roller is driven to the test station 2, the steel wheel of the roller can be supported by the two support platforms 1101 until the steel wheel moves between the two nonlinear stiffness model rollers 1001. The support platform 1101 is driven downward by shortening the support cylinder 1102. Therefore, the roller and the steel wheel move downward at the same time until the steel wheel contacts the two nonlinear stiffness model rollers 1001 and is effectively supported by the two nonlinear stiffness model rollers 1001. At this time, the steel wheel and the support platform 1101 are out of the support state, thereby completing the rapid adaptation of the steel wheel of the roller and the steel wheel of the roller falling into the test station.

[0085] The multi-directional damping system components of the present invention include a vertical damping group, a transverse damping group, and a longitudinal damping group, and the damping force is dynamically adjusted by a hydraulic servo valve. The vertical damping group, the transverse damping group, and the longitudinal damping group can all be removably installed in the test station 2. The vertical damping group includes four groups of equidistantly arranged vertical hydraulic cylinders, which directly act on the platform below the roller's steel wheel. The transverse damping group includes two groups of transversely arranged horizontal hydraulic cylinders, which are installed on the guide rails on both sides of the steel wheel to suppress lateral swing. The longitudinal damping group includes two groups of longitudinally arranged horizontal hydraulic cylinders, which are installed in front of the steel wheel to simulate travel resistance. The hydraulic servo valve is a high-frequency response proportional servo valve with a frequency response of ≥100Hz. The damping force of the multi-directional damping system components is dynamically calculated according to the material property model and satisfies the formula:

[0086] F=C·v n +K· x

[0087] C is the viscous damping coefficient, v is the speed of the steel wheel, n is the nonlinear index, K is the equivalent stiffness coefficient, and x is the displacement.

[0088] During fault simulation tests, such as bolt loosening simulation, the vertical damping group needs to reduce pressure to simulate the failure of steel wheel fixation. For eccentric block imbalance simulation, the lateral damping group applies a periodic alternating force to simulate the phase deviation of the eccentric block. For road surface roughness simulation, the longitudinal damping group outputs random fluctuation resistance. The random fluctuation resistance needs to generate an excitation signal based on the ISO 8608 road surface spectrum.

[0089] The data acquisition system components in the present invention include a six-dimensional force sensor, a laser displacement sensor, a pressure transmitter and an infrared thermal imager. The six-dimensional force sensor is installed on the contact surface between the steel wheel and the platform to monitor the resultant force in all directions in real time. The laser displacement sensor is installed on both sides of the test station 2. The pressure transmitter is installed in the hydraulic system of the multi-directional damping system component to monitor the inlet and outlet pressure difference of the hydraulic cylinder and close the loop to control the damping force. The infrared thermal imager is installed on the side of the roller steel wheel to monitor the bearing temperature of the roller steel wheel, thereby realizing accurate online measurement of various data of the roller during vibration testing.

[0090] The limiting assembly 4 of the present invention includes an upper bracket 401, which is fixed to the top of the patterned deck 3 by bolts. Two rails 408 are fixed to both sides of the top of the upper bracket 401 by bolts. A slide 406 is connected between the two rails 408 through a slide. One side of the slide 406 is hinged to a flip frame 403 through a mounting seat 405. The end of the flip frame 403 is rotatably connected to a pressing roller 404 through a bearing. One side of the slide 406 is hinged to two flip cylinders 402, and the flip cylinder 4 One end of the 02 piston rod is rotatably connected to the flip frame 403, and two mounting frames 407 are fixed to both sides of the top of the upper bracket 401 by bolts. A servo motor 411 is fixed to the four corners of the top of the upper bracket 401 by bolts, and one end of the output shaft of the servo motor 411 and the inside of the mounting frame 407 are provided with a synchronous pulley 410. One end of the output shaft of the servo motor 411 and the two synchronous pulleys 410 inside the mounting frame 407 are connected by a synchronous belt 409, and multiple synchronous belts 409 are respectively connected to the track The slides set on 408 are fixed, and multiple fences 5 are fixed to the top of the patterned deck 3 and around the test station 2 by bolts. Removable steel chains 6 are hung between adjacent fences 5. The removable steel chains 6 form a surrounding state of the test station 2. By starting the servo motor 411, the servo motor 411 rotates through the synchronous belt 409 to make the two synchronous pulleys 410 rotate synchronously. At this time, the slide 406 can move along the track 408 through the slide fixed with the synchronous belt 409, so that the pressing roller 4 04 Movement: Move to the designated position according to different roller models, and then start the flip cylinder 402. The flip cylinder 402 extends to drive the flip frame 403 to rotate around the mounting seat 405, and the pressing roller 404 provided at the end of the flip frame 403 presses the steel wheel of the roller from the upper side to limit the position of the roller, thereby limiting the position of the roller and effectively preventing the roller from running away from the test station during the test. In addition, due to the provision of the fence 5 and the detachable steel chain 6, double protection is formed for the roller during the test.

[0091] A method for testing a vibration test device comprises the following steps:

[0092] S1: First, confirm the model of the roller, then start the drive motor 1201. The drive motor 1201 rotates to drive the gear 1202 to rotate. Since the gear 1202 is engaged with the rack 1203, the gear 1202 rotates and moves along the rack 1203, thereby adjusting the distance between the two adjustment frames 1003. At this time, the detachable deck 8 is inserted into the paving groove 9 through the insert 801 to complete the laying of the detachable deck 8. The laid detachable deck 8 can not only provide walking support for the roller, but also form an effective avoidance position for the two sets of nonlinear stiffness model rollers 1001, thereby completing the adaptation of the test bench;

[0093] S2: Since the top of the support platform 1101 is on the same horizontal plane as the nonlinear stiffness model roller 1001, the detachable deck 8, and the patterned deck 3, when the road roller is driven to the test station 2, the steel wheel of the road roller can be supported by the two support platforms 1101 until the steel wheel moves between the two nonlinear stiffness model rollers 1001. The support platform 1101 is driven to move downward by shortening the support cylinder 1102. Therefore, the road roller and the steel wheel move downward at the same time until the steel wheel contacts the two nonlinear stiffness model rollers 1001 and is effectively supported by the two nonlinear stiffness model rollers 1001. At this time, the steel wheel and the support platform 1101 are out of the support state, thereby completing the rapid adaptation of the steel wheel of the road roller and the steel wheel of the road roller falling into the test station;

[0094] S3: Then, the data acquisition system components are installed. The six-dimensional force sensor is installed on the contact surface between the steel drum and the platform to monitor the resultant force in all directions in real time. The laser displacement sensor is installed on both sides of the test station 2. The pressure transmitter is installed in the hydraulic system of the multi-directional damping system component to monitor the inlet and outlet pressure difference of the hydraulic cylinder and close the damping force. The infrared thermal imager is installed on the side of the roller steel drum to monitor the bearing temperature of the roller steel drum. This enables accurate online measurement of various data during the roller vibration test.

[0095] S4: Then, the multi-directional damping system components are adapted and installed. Four sets of equidistantly arranged vertical hydraulic cylinders act directly on the platform below the roller's steel drum, forming the vertical damping group. Two sets of transversely arranged horizontal hydraulic cylinders are installed on the guide rails on both sides of the steel drum to suppress lateral swing, forming the transverse damping group. Two sets of longitudinally arranged horizontal hydraulic cylinders are installed in front of the steel drum to simulate travel resistance, forming the longitudinal damping group.

[0096] S5: Then, perform a no-load frequency sweep test, run the self-test program under load, and reciprocate the vertical damping group through the full stroke to verify the displacement-pressure linearity; apply a step force to the lateral damping group to test the response time;

[0097] S6: After the no-load sweep frequency test is completed, load debugging is performed and a debugging mode is selected, such as the sand and gravel simulation mode. At this time, the nonlinear stiffness model roller 1001 supports asphalt medium simulation based on the Hertz contact theory;

[0098] S7: Then the roller vibration motor is started to perform a vibration test. At this time, the data acquisition system components complete the accurate online measurement of various data during the vibration test;

[0099] S8: Fault simulation tests are then conducted, such as bolt loosening simulation, which requires reducing pressure through the vertical damping group to simulate steel wheel fixation failure; eccentric block imbalance simulation, in which the lateral damping group applies periodic alternating force to simulate eccentric block phase deviation; and road surface roughness simulation, in which the longitudinal damping group outputs random fluctuating resistance. The random fluctuating resistance needs to generate an excitation signal based on the ISO 8608 road surface spectrum to verify the roller system alarm threshold.

[0100] S9: After debugging is completed, a debugging report is generated and uploaded to the cloud database.

[0101] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0102] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A vibration testing device, comprising a factory building, wherein at least three test stations are provided in the factory building, and rolling shutter doors for two-way access to the test stations are provided on both sides of the factory building, characterized in that: The test station platform includes a frame, which is located inside the floor of the factory building. The test station of the test station platform is paved with patterned planks and is flush with the floor. The test station platform also includes: Adaptive adjustment component, which is located inside the frame and adaptively adjusts the test station to different roller models; Two sets of load simulation and debugging components, both of which are located inside the frame and support the steel wheels of the roller, as well as simulate different road conditions for the roller. The load simulation and debugging components include two nonlinear stiffness model rollers, both of which are rotatably connected to the adjustment frame through bearing seats. Brake discs are fixed in the middle of the two nonlinear stiffness model rollers. Two brake calipers are fixedly connected to the top of the adjustment frame for braking the two brake discs respectively. A support component is provided between the two nonlinear stiffness model rollers to support the steel wheels of the roller; The limit assembly is located above and around the test station and effectively limits the roller when it is tested inside the test station; Multi-directional damping system components: The multi-directional damping system can be detachably installed in the test station and implement fault simulation tests on the steel wheel of the roller. The multi-directional damping system components include vertical damping group, lateral damping group and longitudinal damping group, and the damping force is dynamically adjusted by hydraulic servo valve. The vertical damping group, lateral damping group and longitudinal damping group can all be detachably installed in the test station. The vertical damping group includes four groups of equidistantly arranged vertical hydraulic cylinders, which directly act on the platform below the steel wheel of the roller. The lateral damping group includes two groups of horizontal hydraulic cylinders arranged laterally, which are installed on the guide rails on both sides of the steel wheel to suppress lateral swing. The longitudinal damping group includes two groups of horizontal hydraulic cylinders arranged longitudinally, which are installed in front of the steel wheel to simulate travel resistance. The vertical damping group, lateral damping group and longitudinal damping group work together to realize switching between bolt loosening simulation, eccentric block imbalance simulation and road surface unevenness simulation. The data acquisition system component can be detachably installed in the test station and collects various data during the roller steel wheel test.

2. A vibration testing device according to claim 1, characterized in that The adaptive adjustment component includes two sets of double guide rail frames, both sets of double guide rail frames are fixedly connected to the inside of the frame body, and two adjustment frames are slidably connected between the two sets of double guide rail frames through multiple sets of slides. Both sides of the two adjustment frames are fixedly connected to drive motors, and one end of the drive motor output shaft is keyed to a gear. Racks are fixedly connected to the inside of the two sets of double guide rail frames, and the racks are meshed with the gears.

3. A vibration testing device according to claim 2, characterized in that The nonlinear stiffness model roller is a nonlinear stiffness model based on Hertz contact theory that supports multi-media simulation of asphalt, sand and gravel, and concrete.

4. A vibration testing device according to claim 3, characterized in that The support assembly includes multiple support cylinders, which are respectively fixedly connected to the tops of two adjustment frames. One end of the piston rods of the multiple support cylinders on the same side is fixedly connected to a support platform. The two support platforms are respectively located between the two nonlinear stiffness model rollers of the two load simulation debugging components. Multiple laying grooves are opened on both sides of the top of the frame. Multiple detachable laying plates are laid in the laying grooves to avoid the nonlinear stiffness model rollers. The detachable laying plates are steel plates. Both ends of the steel plates are fixedly connected with inserts that can be inserted into the laying grooves. The top of the support platform is in the same horizontal plane as the nonlinear stiffness model roller, the detachable laying plates, and the patterned laying plates.

5. A vibration testing device according to claim 4, characterized in that The hydraulic servo valve is a high-frequency response proportional servo valve with a frequency response of ≥100Hz, and the damping force of the multi-directional damping system components is dynamically calculated according to the material property model and satisfies the formula: F=C·vn+K·x C is the viscous damping coefficient, v is the speed of the steel wheel, n is the nonlinear index, K is the equivalent stiffness coefficient, and x is the displacement.

6. A vibration testing device according to claim 1, characterized in that: The data acquisition system components include a six-dimensional force sensor, a laser displacement sensor, a pressure transmitter and an infrared thermal imager. The six-dimensional force sensor is installed on the contact surface between the steel wheel and the platform to monitor the resultant force in all directions in real time. The laser displacement sensor is installed on both sides of the test station. The pressure transmitter is installed in the hydraulic system of the multi-directional damping system component to monitor the inlet and outlet pressure difference of the hydraulic cylinder and close the loop to control the damping force. The infrared thermal imager is installed on the side of the roller steel wheel to monitor the bearing temperature of the roller steel wheel.

7. A vibration testing device according to claim 1, characterized in that: Material toggling mechanism, its both sides respectively have a cylinder pressure, and the cylinder pressure bar connects swing arm, and the swing arm end face has hook portion, and a bar passes position between the end of two swing arms and the hook portion.

8. A testing method for a vibration testing device, applicable to a vibration testing device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: First, confirm the roller model, then start the drive motor. The drive motor rotates and drives the gear to rotate. Since the gear is meshed with the rack, the gear rotates and moves along the rack, thereby adjusting the distance between the two adjustment frames. At this time, the detachable deck is inserted into the paving groove through the insert block to complete the laying of the detachable deck. The laid detachable deck can not only complete the walking support of the roller, but also form an effective avoidance position for the two sets of nonlinear stiffness model rollers, thereby completing the adaptation of the test bench; S2: Since the top of the support platform is on the same horizontal plane as the nonlinear stiffness model roller, the detachable decking, and the patterned decking, when the roller is driven to the test station, the two support platforms can support the steel wheel of the roller until the steel wheel moves between the two nonlinear stiffness model rollers. The support platform is driven downward by shortening the support cylinder, so that the roller and the steel wheel move downward at the same time until the steel wheel contacts the two nonlinear stiffness model rollers and is effectively supported by the two nonlinear stiffness model rollers. At this time, the steel wheel and the support platform are out of the support state, thereby completing the rapid adaptation of the steel wheel of the roller and the steel wheel of the roller falls into the test station; S3: Then, the data acquisition system components are installed. The six-dimensional force sensor is installed on the contact surface between the steel drum and the platform to monitor the resultant force in all directions in real time. The laser displacement sensor is installed on both sides of the test station. The pressure transmitter is installed in the hydraulic system of the multi-directional damping system component to monitor the inlet and outlet pressure difference of the hydraulic cylinder and close the damping force. The infrared thermal imager is installed on the side of the roller steel drum to monitor the bearing temperature of the roller steel drum. This enables accurate online measurement of various data during the roller vibration test. S4: Then, the multi-directional damping system components are adapted and installed. Four sets of equidistantly arranged vertical hydraulic cylinders act directly on the platform below the roller's steel drum, forming the vertical damping group. Two sets of transversely arranged horizontal hydraulic cylinders are installed on the guide rails on both sides of the steel drum to suppress lateral swing, forming the transverse damping group. Two sets of longitudinally arranged horizontal hydraulic cylinders are installed in front of the steel drum to simulate travel resistance, forming the longitudinal damping group. S5: Then perform a no-load frequency sweep test, run the self-test program under load, and reciprocate the vertical damping group through the full stroke to verify the displacement-pressure linearity; Apply a step force to the lateral damping group and test the response time; S6: After the no-load sweep frequency test is completed, load debugging is carried out and a debugging mode is selected, such as the sand and gravel simulation mode. In this case, the nonlinear stiffness model roller supports asphalt medium simulation based on the Hertz contact theory. S7: Then the roller vibration motor is started to perform a vibration test. At this time, the data acquisition system components complete the accurate online measurement of various data during the vibration test; S8: Fault simulation tests are then conducted, such as bolt loosening simulation, which requires reducing pressure through the vertical damping group to simulate steel wheel fixation failure; eccentric block imbalance simulation, in which the lateral damping group applies periodic alternating force to simulate eccentric block phase deviation; and road surface roughness simulation, in which the longitudinal damping group outputs random fluctuating resistance. The random fluctuating resistance needs to generate an excitation signal based on the ISO 8608 road surface spectrum to verify the roller system alarm threshold. S9: After debugging is completed, a debugging report is generated and uploaded to the cloud database.

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