Vibratory roller excitation force testing equipment and testing method

Abstract

The present invention provides a vibration roller excitation force testing device and testing method. The device includes a vibration test bench and a static pressure test bench. The vibration test bench includes a vibration bearing, a piezoresistive pressure sensor I, a gasket I, a pressure sensing blanket, and a test base plate I. The static pressure test bench includes a static pressure bearing, a piezoresistive pressure sensor II, a gasket II, and a test base plate II. A ramp A is provided at the front end of the vibration test bench, a roller A is provided at the rear end of the vibration test bench, a ramp B is provided at the rear end of the static pressure test bench, and a roller B is provided at the front end of the static pressure test bench. Axial force sensors are provided at both ends of rollers A and B. A safety wall is provided near ramp A on the vibration test bench, and a weighing sensor is provided vertically near ramp B on the static pressure test bench. The bottom end of the weighing sensor is connected to the foundation surface platform. The vibration roller excitation force testing device can determine the magnitude and directionality of the excitation force and is flexible and adaptable to various working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical force measurement, and in particular to a vibration roller excitation force testing device and a testing method. Background Art

[0002] Vibratory rollers utilize the static pressure generated by the weight of the vibrating wheel and frame, combined with the dynamic force generated by the wheel's vibration, to compact road construction materials. Due to their strong adaptability to soil conditions, excellent stability, high productivity, and resistance to material gradation, they have gradually replaced static rollers and are widely used in compacting various pavements and roadbeds. The essence of vibratory compaction is that, under the influence of vibrational stress, soil particles overcome internal friction, rearrange themselves, and move closer together. This compresses the inter-particle pores and increases the density of the soil. The vibration frequency refers to the number of times the vibrating wheel vibrates per unit time under the excitation force generated by the high-speed rotation of the eccentric mass. This frequency can be adjusted by the input flow rate of the hydraulic motor. For the same number of rolls, if the excitation force is too low, the compaction effect will be poor and efficiency will decrease. Conversely, if the vibration frequency is too high, not only will the effective utilization of the excitation force be reduced, resulting in energy waste, but it may even cause the vibrating wheel to jump off the ground and lose its footing.

[0003] Currently, there is no equipment or facility on the market to test the excitation force of vibratory rollers. Currently, testing is performed through calculations, but simple calculations alone cannot meet the requirements for vibratory roller excitation force testing. There is an urgent need for a testing device that is accurate, flexible, and adaptable to various working conditions. Summary of the Invention

[0004] The present invention provides a vibration roller exciting force testing device and a testing method to solve the problem in the prior art that the magnitude and directionality of the exciting force cannot be accurately judged.

[0005] To achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions:

[0006] A vibration roller excitation force testing device, comprising a vibration test bench and a static pressure test bench;

[0007] The vibration test bench includes a vibration bearing platform, a piezoresistive pressure sensor I, a gasket I, a pressure sensing blanket and a test base plate I, which are arranged in order from top to bottom;

[0008] The static pressure test bench includes a static pressure support, a piezoresistive pressure sensor II, a gasket II and a test base plate II, which are arranged in order from top to bottom;

[0009] A ramp A is set at the front end of the vibration test bench, a roller A is set at the rear end of the vibration test bench, a ramp B is set at the rear end of the static pressure test bench, a roller B is set at the front end of the static pressure test bench, and axial force sensors are set at both ends of roller A and roller B;

[0010] Roller A and Roller B are opposite rollers, used to calculate the direction of the exciting force, and serve as the transition zone between the vibration test bench and the static pressure test bench;

[0011] A safety wall is set up near ramp A on the vibration test bench, and a load cell is vertically set up near ramp B on the static pressure test bench. The bottom end of the load cell is connected to the foundation surface platform.

[0012] The aforementioned vibratory roller excitation force testing equipment is based on rollers A and B, which are supported by two mutually perpendicular rods arranged at a 135° angle to the foundation surfaces on either side. Axial force sensors are installed within the rods. This is used to determine whether the direction of the resultant excitation force is vertical by testing the equality of the axial forces on the opposing rollers during the vibration of the vibratory roller. When the values ​​of the two axial force sensors are equal, the direction of the resultant excitation force is vertical according to the resultant force calculation formula. When the values ​​of the two axial force sensors are unequal, the direction of the resultant excitation force is not vertical.

[0013] Based on the above-mentioned vibratory roller excitation force test equipment, limit blocks are set on the vibration test platform and the static pressure test platform; the limit blocks are arranged on both sides of the static pressure base and the vibration base and are not higher than the static pressure base and the vibration base. On the one hand, it ensures that the test platform does not move due to the vibration of the vibratory roller, thereby ensuring the test accuracy; on the other hand, if the vibratory roller driver makes an operating error, it can ensure that the vibratory roller does not roll over, thereby ensuring the safety of the equipment driver and the equipment; its bottom is connected to the test base plate, and the connection method is bonding, threaded connection, welding, preferably welding.

[0014] Based on the above-mentioned vibratory roller excitation force testing equipment, piezoresistive pressure sensor I and piezoresistive pressure sensor II are wrapped with rubber. The protective form of the sensor is that the rubber completely wraps the sensor, which can reduce damage to the internal structure of the vibratory roller and increase the service life of the piezoresistive pressure sensor; gasket I and gasket II are made of metal, preferably steel plate.

[0015] Based on the aforementioned vibratory roller excitation force testing equipment, the lengths of the static pressure test bench and the vibration test bench were limited. To save materials and facilitate transportation, the static pressure test bench was 5.6 meters long, 20% longer than the total length of common vibratory rollers on the market. To ensure sufficient area for excitation force testing, the vibration test bench was 8.96 meters longer than the static pressure test bench.

[0016] Based on the above-mentioned vibration roller excitation force test equipment, the piezoresistive pressure sensor II is installed at the bottom of the static pressure test bench at a speed of 6 / m 2 Uniform arrangement; Piezoresistive pressure sensor I is arranged at the bottom of the vibration test bench at 9 / m 2The sensors are evenly arranged in a rectangular shape, which can increase the accuracy of static pressure and vibration tests. Piezoresistive pressure sensors I and II are tested in a joint adjustment mode, and the pressure shared by each sensor is comprehensively calculated. This can reduce the damage to the piezoresistive pressure sensors under the static and dynamic loads of the vibratory roller, and can also test the pressure distribution.

[0017] A method for performing an excitation force test using an excitation force test device for a vibratory roller comprises the following steps:

[0018] S1: Clean the vibratory roller to be tested and let it dry;

[0019] S2: The driver aligns the vibratory roller, stops it at a distance from ramp B, starts slowly, and moves forward at a speed of ≤5 km / h;

[0020] S3: After climbing up ramp B, stop the vehicle in the middle of the static pressure test bench. The weighing sensor measures the mass M1 of the vibratory roller to be tested, and the piezoresistive pressure sensor II measures the pressure value of the vibratory roller. And convert it into mass M2=Fstatic / g, compare the latter mass with the former mass, and get the sensitivity coefficient R=M1 / M2 of the piezoresistive pressure sensor II at this time;

[0021] S4: After the static pressure test is completed, start the vibratory roller and then start the vibration function to calculate the exciting force of the vibratory roller;

[0022] S5: The vibratory roller moves forward, and the vibratory wheel of the vibratory roller stops between rollers A and B, and the vibratory roller is kept in working state. At this time, the axial force sensors inside the support rod calculate the axial forces F1 and F2. When the values ​​of the two axial force sensors are equal, that is, F1=F2, the direction of the resultant force of the exciting force is vertical according to the resultant force calculation formula. When the values ​​of the two axial force sensors are unequal, that is, F1≠F2, the direction of the resultant force of the exciting force is not vertical.

[0023] S6: After the excitation force direction test is completed, the vibrating wheel remains in the vibrating state and the vibratory roller continues to move forward. The vibratory roller continues to pass through the vibration test bench at a speed of ≤5km / h. During the forward movement, the steering wheel remains stationary.

[0024] S7: During the forward movement, the piezoresistive pressure sensor I continuously collects data. Since the vibration frequency of the vibratory roller is mostly 26-38 Hz, the collection interval is 1 / 60 s, and the maximum absolute value of the exciting force within ten seconds is taken as the sensor pressure size. At this time, calculate F 激 is the tested value;

[0025] S8: Close the safety wall, the vibratory roller leaves the vibration test bench, and the test is completed;

[0026] Where: R is the sensitivity coefficient of the piezoresistive pressure sensor (the ratio between the values ​​of the piezoresistive pressure sensor and the load cell is R), and the R value range is 0-1; ω is the temperature coefficient of the rubber material surrounding the piezoresistive pressure sensor; m is the influence coefficient of the flatness of the test site; η is the total lateral force coefficient of the vibratory roller during its travel, and the lateral force reference coefficient is 0.732; N is the number of piezoresistive pressure sensors in the static load test area; It is the maximum value collected by each piezoresistive pressure sensor every 10 seconds when the vibratory roller is moving.

[0027] The speed in step S2 and step S6 is uniform and equal to 3 km / h.

[0028] Compared with the prior art, the advantages of the vibration roller excitation force testing device and testing method provided by the present invention are:

[0029] 1. It solves the problem that there is no equipment and facilities to test the exciting force of the vibratory roller, and overcomes the difficulty that the simple calculation process cannot meet the requirements for the exciting force test of the vibratory roller.

[0030] 2. Be able to judge the accuracy of the exciting force and direction of the vibratory roller.

[0031] 3. It can be moved flexibly and can adapt to various working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0033] Figure 1 : Overall layout of the vibration roller excitation force test device;

[0034] Figure 2 : Vibration test bench for vibratory roller excitation force test device;

[0035] Figure 3 : Static pressure test bench for vibration roller excitation force test device;

[0036] Figure 4 : Schematic diagram of analysis of the axial force direction of the opposing rollers;

[0037] Figure 5 : Top view of the vibration roller excitation force test device

[0038] Figure 6 :Design drawing of rubber piezoresistive pressure sensor;

[0039] Figure 7 : Plane layout of rubber piezoresistive pressure sensor of vibration test bench;

[0040] Figure 8 : Plane layout of rubber piezoresistive pressure sensor of static pressure test bench;

[0041] Figure 9 : Ramp design drawing of vibration roller excitation force test device;

[0042] Figure 10 : Design drawing of the support rod wrapped axial force sensor of the vibratory roller excitation force test device;

[0043] In the figure: 1-ramp A, 2-safety wall, 3-test base plate I, 4-piezoresistive pressure sensor I, 5-pressure sensing blanket, 6-vibration support platform, 7-roller A, 8-support rod, 9-roller B, 10-gasket II, 11-test base plate, 12-static pressure support platform, 13-piezoresistive pressure sensor II, 14-load cell, 15-ramp B, 16-gasket I, 17-vibration test platform, 18-static pressure test platform, 19-rubber, 20-limit block, 21-axial force sensor. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] A vibration roller excitation force testing device includes a vibration test bench 17 and a static pressure test bench 18. The vibration test bench 17 includes a vibration base 6, a piezoresistive pressure sensor 14, a gasket 16, a pressure sensing blanket 5, and a test base plate 13, arranged in order from top to bottom. The upper portion of the vibration base 6 is etched with patterns to increase vehicle friction and ensure safety. The pressure sensing blanket is laid under the vibration test bench. Compared to other pressure sensors that can only control points, the pressure sensing blanket can more accurately reflect the stress distribution of the vibratory roller during its forward movement, and is a device for detecting the entire surface.

[0046] The static pressure test bench 18 includes a static pressure base 12, a piezoresistive pressure sensor II 13, a gasket II 10, and a test base plate II 11, which are arranged in order from top to bottom. The upper part of the static pressure base 12 is etched with patterns to increase the friction of the vehicle and ensure safety.

[0047] A ramp A is provided at the front end of the vibration test bench 17, and a roller A is provided at the rear end of the vibration test bench 17. A ramp B is provided at the rear end of the static pressure test bench 18, and a roller B is provided at the front end of the static pressure test bench 18. Roller A and roller B are opposing rollers, two pairs of opposing rollers, a total of four rollers. A total of eight axial force sensors 21 are provided at both ends of roller A and roller B.

[0048] A safety wall 2 is hingedly set on the vibration test bench 17 near ramp A, and a weighing sensor 14 is vertically set on the static pressure test bench 18 near ramp B. The bottom end of the weighing sensor 14 is connected to the foundation surface platform. The safety wall 2 can ensure the safety of the test personnel, avoid damage to mechanical equipment, and prevent damage to other test personnel and belongings due to mechanical inertia; the safety wall is closable. When the safety wall is closed, the vibratory roller can leave the detection area on the vibration test bench, and the vibration roller can be maneuvered and static pressure cycle tested. The static pressure test bench and the vibration test bench can be used cyclically to improve the detection efficiency.

[0049] In practice, in order to ensure convenient transportation, the equipment can be disassembled and assembled, that is, it can be divided into left and right static pressure wheel bases, left and right vibration wheel bases, left and right static pressure test bench wheel bases, left and right vibration test bench wheel bases and four ramps, a total of 12 parts.

[0050] In this embodiment, the roller A and roller B support are composed of two mutually perpendicular support rods 8 arranged at an angle of 135° to the base surface platforms on both sides, and an axial force sensor 21 is set inside the support rod 8;

[0051] In this embodiment, the vibration test platform 17 and the static pressure test platform 18 are both provided with limit blocks 20; the limit blocks 20 are arranged on both sides of the static pressure support platform 12 and the vibration support platform 6 and are not higher than the static pressure support platform 12 and the vibration support platform 6, and the bottoms thereof are welded to the test base plate;

[0052] In this embodiment, the piezoresistive pressure sensor I4 and the piezoresistive pressure sensor II13 are wrapped with rubber 19, and the sensor protection form is that the rubber 19 completely wraps the sensor; the gasket I and the gasket II are made of steel plates.

[0053] In this embodiment, the length of the static pressure test bench 18 is 5.6 m, and the vibration test bench 17 is 8.96 m longer than the static pressure test bench 18;

[0054] In this embodiment, the piezoresistive pressure sensor II 13 is placed at the bottom of the static pressure test bench 18 at a rate of 6 / m 2 Uniform arrangement; Piezoresistive pressure sensor Ⅰ 4 is arranged at the bottom of the vibration test table 17 according to 9 / m 2The arrangement is uniform and rectangular in shape. This arrangement can increase the accuracy of static pressure test and vibration test. When the piezoresistive pressure sensor I4 and the piezoresistive pressure sensor II13 are tested, a joint adjustment method is adopted to comprehensively calculate the pressure shared by each sensor.

[0055] A method for performing an excitation force test using an excitation force test device for a vibratory roller comprises the following steps:

[0056] S1: Clean the vibratory roller to be tested and let it dry;

[0057] S2: The driver aligns the vibratory roller, stops it at a distance from ramp B, starts slowly, and moves forward at a speed of 3 km / h;

[0058] S3: After climbing up ramp B, the vehicle stops in the middle of the static pressure test bench 18. The weighing sensor 14 measures the mass M1 of the vibratory roller to be tested, and the piezoresistive pressure sensor II measures the pressure value of the vibratory roller. And convert it into mass M2=Fstatic / g, compare the latter mass with the former mass, and get the sensitivity coefficient R=M1 / M2 of the piezoresistive pressure sensor II at this time;

[0059] S4: After the static pressure test is completed, start the vibratory roller and then start the vibration function to calculate the exciting force of the vibratory roller;

[0060] S5: The vibratory roller moves forward, and the vibratory wheel of the vibratory roller stops between rollers A and B, and the vibratory roller is ensured to be in working state. At this time, the axial force sensor 21 inside the support rod 8 calculates the axial forces F1 and F2. When the values ​​of the two axial force sensors 21 are equal, that is, F1=F2, according to the resultant force calculation formula, the direction of the resultant force of the exciting force is the vertical direction. When the values ​​of the two axial force sensors 21 are unequal, that is, F1≠F2, the direction of the resultant force of the exciting force is not the vertical direction;

[0061] S6: After the excitation force direction test is completed, the vibrating wheel remains in the vibrating state, and the vibratory roller continues to move forward. The vibratory roller continues to pass through the vibration test bench 17 at a speed of 3 km / h. During the forward movement, the steering wheel remains stationary.

[0062] S7: During the forward movement, the piezoresistive pressure sensor I continuously collects data. Since the vibration frequency of the vibratory roller is mostly 26-38 Hz, the collection interval is 1 / 60 s, and the maximum absolute value of the exciting force within ten seconds is taken as the sensor pressure size. At this time, calculate F 激 is the tested value;

[0063] S8: The safety wall 2 is closed, and the vibratory roller leaves the vibration test bench 17, completing the test.

[0064] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are 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 will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A vibration roller excitation force testing device, characterized by: Including vibration test bench and static pressure test bench; The vibration test bench includes a vibration bearing platform, a piezoresistive pressure sensor I, a gasket I, a pressure sensing blanket and a test base plate I, which are arranged in order from top to bottom; The static pressure test bench includes a static pressure support, a piezoresistive pressure sensor II, a gasket II and a test base plate II, which are arranged in order from top to bottom; A ramp A is set at the front end of the vibration test bench, a roller A is set at the rear end of the vibration test bench, a ramp B is set at the rear end of the static pressure test bench, a roller B is set at the front end of the static pressure test bench, and axial force sensors are set at both ends of roller A and roller B; A safety wall is set up near ramp A on the vibration test bench, and a load cell is set up vertically near ramp B on the static pressure test bench. The bottom end of the load cell is connected to the foundation surface platform. Roller A and Roller B support consists of two mutually perpendicular support rods arranged at an angle of 135° to the base surface on both sides; Limit blocks are set on both the vibration test bench and the static pressure test bench; the limit blocks are arranged on both sides of the base, and their bottoms are connected to the test base plate.

2. The vibration roller excitation force testing device according to claim 1, characterized in that: The piezoresistive pressure sensor I and the piezoresistive pressure sensor II are wrapped with rubber, and the protective sensor form is that the rubber completely wraps the sensor; the gasket I and the gasket II are made of metal.

3. The vibration roller excitation force testing device according to claim 1, characterized in that: The lengths of the static pressure test bench and the vibration test bench are limited. The length of the static pressure test bench is 5.6m, and the vibration test bench is 8.96m longer than the static pressure test bench.

4. The vibration roller excitation force testing device according to claim 1, characterized in that: Piezoresistive pressure sensors II are evenly arranged at a rate of 6 per m2 at the bottom of the static pressure test bench; piezoresistive pressure sensors I are evenly arranged at a rate of 9 per m2 at the bottom of the vibration test bench in a rectangular shape; piezoresistive pressure sensors I and II are tested in a joint debugging manner.

5. A method for performing an excitation force test using the excitation force test equipment for a vibratory roller according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1: Clean the vibratory roller to be tested and let it dry; S2: The driver aligns the vibratory roller, stops it at a distance from ramp B, starts slowly, and moves forward at a speed of ≤5km / h; S3: After climbing up ramp B, stop the vehicle in the middle of the static pressure test bench. The load cell measures the mass M1 of the vibratory roller to be tested, and the piezoresistive pressure sensor II measures the pressure value of the vibratory roller. , and converted into mass M2=F static / g, comparing the latter mass with the former mass, the sensitivity coefficient of the piezoresistive pressure sensor II is obtained at this time R=M1 / M2; S4: After the static pressure test is completed, start the vibratory roller and then start the vibration function to calculate the exciting force of the vibratory roller; S5: The vibratory roller moves forward, and the vibratory wheel of the vibratory roller stops between rollers A and B, and the vibratory roller is kept in working condition. At this time, the axial force sensors inside the support rods calculate the axial forces F1 and F2. When the values ​​of the two axial force sensors are equal, that is, F1=F2, the direction of the resultant force of the exciting force is vertical according to the resultant force calculation formula. When the values ​​of the two axial force sensors are unequal, that is, F1≠F2, the direction of the resultant force of the exciting force is not vertical. S6: After the excitation force direction test is completed, the vibrating wheel remains in the vibrating state and the vibratory roller continues to move forward. The vibratory roller continues to pass through the vibration test bench at a speed of ≤5km / h. During the forward movement, the steering wheel remains stationary. S7: During the forward movement, the piezoresistive pressure sensor I continuously collects data. Since the vibration frequency of the vibratory roller is mostly 26-38 Hz, the collection interval is 1 / 60 s, and the maximum absolute value of the exciting force within every ten seconds is taken as the sensor pressure size. ,At this time, calculate F excitation as the tested value; S8: Close the safety wall, the vibratory roller leaves the vibration test bench, and the test is completed.

6. The exciting force testing method according to claim 5, characterized in that : The speed in step S2 and step S6 is uniform and equal to 3 km / h.

Images