Accelerated loading experimental equipment for mixture

Abstract

The utility model discloses accelerated loading experimental equipment for a mixture, which relates to the technical field of pavement detection and comprises a driving shaft rotatably mounted on the ground and a rotation driving device for driving the driving shaft to rotate, a plurality of groups of wheel assemblies are arranged at the same radius position in the circumferential direction of the driving shaft, and each wheel assembly comprises a wheel bracket and a simulation wheel rotationally mounted on the wheel bracket; the simulation wheel rotates by taking the driving shaft as a circle center; the wheel support is connected with the driving shaft through the cantilever, the wheel support is installed on the cantilever in an up-and-down limiting and sliding mode, a loading device is arranged between the wheel support and the cantilever, and the loading device adjusts the distance between a wheel shaft of the simulation wheel and a pavement. The multiple wheel assemblies are used for rolling the pavement at the same time, the rolling efficiency is improved, each wheel assembly is provided with one loading device, and accurate control over loading numerical values is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of road surface detection, in particular to accelerated loading experimental equipment for mixed materials. Background Art

[0002] When the quality of the mixture for paving roads needs to be tested, a road acceleration loading test device is needed. Most of the existing road acceleration loading test devices adopt a crawler structure, which uses a circular wheel to reciprocate and alternately roll the road surface to achieve road surface testing. However, this structure has inaccurate load value control, and the wheels are empty, resulting in low rolling efficiency. Utility Model Content

[0003] The utility model aims to provide an accelerated loading test device for a mixture, which rolls a paved road surface simultaneously through a plurality of wheel assemblies, thereby improving the rolling efficiency. A loading device is arranged on each wheel assembly to realize accurate control of the loading value.

[0004] In order to achieve the above-mentioned purpose, the utility model provides an accelerated loading test equipment for a mixture, comprising a driving shaft rotatably mounted on the ground and a rotating driving device for driving the driving shaft to rotate; a plurality of groups of wheel assemblies are arranged at the same radial position in the circumference of the driving shaft, and the wheel assembly comprises a wheel bracket and a simulated wheel rotatably mounted on the wheel bracket; the simulated wheel rotates with the driving shaft as the center of the circle; the wheel bracket is connected to the driving shaft through a cantilever, and the wheel bracket is slidably mounted on the cantilever with upper and lower limit positions, and a loading device is arranged between the wheel bracket and the cantilever, and the loading device adjusts the distance between the wheel axle of the simulated wheel and the paved road surface.

[0005] After adopting the above structure, by setting up several groups of wheel assemblies, the several groups of wheel assemblies are simultaneously driven to rotate by the same drive shaft to continuously roll the paved road surface, thereby improving the rolling efficiency; at the same time, a loading device is set on each group of wheel assemblies, and the distance between the wheel axle of the simulated wheel and the paved road surface is controlled by the loading device, thereby controlling the rolling pressure, simulating the extrusion deformation of the wheel tire and the ground under the loading state, thereby realizing precise control of the loading value.

[0006] For the convenience of operation, the loading device comprises a jacking device fixedly mounted on the cantilever, and the output shaft of the jacking device is fixed on the wheel bracket.

[0007] In order to achieve precise control of the loading value and detect the pressure of the paved road surface, multiple sensors are embedded between the pavement layer and the roadbed of the paved road surface.

[0008] In order to simulate the rolling of two wheels and ensure uniform force on the paved road surface, four groups of wheel assemblies are provided, each group of wheel assemblies includes two simulated wheels, and the two simulated wheels are coaxially arranged.

[0009] In order to prevent the device from being affected by small stones when the paved road surface is partially damaged, a shock-absorbing device is provided between the wheel bracket and the simulated wheel.

[0010] In order to simplify the shock absorbing device, the wheel bracket includes an upper sliding frame that is slidably installed on the cantilever and a lower sliding frame that is rotatably installed on the wheel axle. A number of guide shafts are fixed on the lower sliding frame, and guide holes are provided on the upper sliding frame. The guide shafts pass through and are slidably installed in the guide holes. A return spring is clamped between the upper sliding frame and the lower sliding frame.

[0011] In order to increase the supporting force and prevent the cantilever from being deformed by force, a protective tube is arranged on the outside of the driving shaft. The bottom of the protective tube is fixed on the ground, and a thrust ball bearing is fixed on the top of the protective tube. The bottom of the cantilever is supported above the thrust ball bearing.

[0012] After adopting the above technical solution, the beneficial effects of the utility model are:

[0013] The utility model discloses an accelerated loading test device for mixture, which solves the technical problems in the prior art of inaccurate loading value control, no-load wheels and low road rolling efficiency. The utility model rolls the circular road surface simultaneously through a plurality of wheel assemblies, thereby improving the working efficiency. A loading device is arranged on each wheel assembly, thereby realizing accurate control of the loading value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of an accelerated loading experimental device for mixed materials of the utility model;

[0015] Figure 2 yes Figure 1 Side view of.

[0016] In the figure, 1. drive shaft, 11. rotation drive device, 13. protective cylinder, 2. wheel assembly, 21. wheel bracket, 211. upper sliding frame, 212. lower sliding frame, 213. guide shaft, 214. return spring, 22. simulated wheel, 23. cantilever, 24. loading device, 4. paved road surface. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings.

[0018] The positions mentioned in this specification are based on the positions of the accelerated loading test equipment for a mixture of the present invention when it is working normally, and do not limit the positions during storage and transportation. They only represent relative position relationships, not absolute position relationships.

[0019] Embodiment 1:

[0020] like Figure 1 and Figure 2 As shown together, an accelerated loading test equipment for a mixture includes a driving shaft 1 rotatably installed on the ground and a rotating driving device 11 for driving the driving shaft 1 to rotate; the driving shaft 1 is vertically upward, and its bottom is rotatably installed on the ground. The rotating driving device 11 in this embodiment is a motor, and pulleys are respectively fixed on the output shaft of the motor and the driving shaft 1. The two pulleys are connected by a belt transmission, and the driving shaft 1 is driven to rotate by the rotating driving device 11. The fixed position of the motor can be reasonably set according to the site requirements. It can be set above the ground, or an installation groove can be dug underground to install the motor. This embodiment does not limit this.

[0021] Several groups of wheel assemblies 2 are arranged at the same radial position on the circumference of the drive shaft 1. In this embodiment, four groups are arranged to balance the force. In actual application, two or three groups can be arranged as needed. The four groups of wheel assemblies 2 are arranged symmetrically in pairs on the circumference of the drive shaft 1.

[0022] The wheel assembly 2 includes a wheel bracket 21 and a simulated wheel 22 rotatably mounted on the wheel bracket 21; the simulated wheel 22 rotates with the drive shaft 1 as the center of the circle; in order to simulate the rolling of two wheels, ensure the maximum fit to the effect of the actual wheels rolling the road surface, and ensure that the paved road surface 4 is evenly stressed, each set of wheel assembly 2 includes two simulated wheels 22, and the two simulated wheels 22 are coaxially arranged. The two simulated wheels 22 are mounted at both ends of the same axle, and the axle is rotatably mounted on the wheel bracket 21.

[0023] The wheel bracket 21 is connected to the drive shaft 1 through the cantilever 23. The wheel bracket 21 is slidably installed on the cantilever 23 with upper and lower limits. A limit groove is vertically arranged on the cantilever 23. The wheel bracket 21 is slidably installed in the limit groove. A limit protrusion is arranged on the wheel bracket 21, so that the wheel bracket 21 is slidably installed on the cantilever 23 with upper and lower limits.

[0024] A loading device 24 is provided between the wheel bracket 21 and the cantilever 23, and the loading device 24 controls the distance between the axle of the simulated wheel 22 and the paved road surface 4. The loading device 24 can be a loading block provided on the wheel bracket 21. By installing the loading block on the wheel bracket 21, the wheel bracket 21 is moved up and down, thereby realizing the loading of the simulated wheel 22. For the convenience of operation, the loading device 24 in this embodiment includes a jacking device fixedly installed on the cantilever 23. The jacking device can be a cylinder, an electric cylinder or an electric push rod. In this embodiment, the jacking device is an electric cylinder. The output shaft of the jacking device is fixed on the wheel bracket 21. The loading of the wheel bracket 21 is realized by the extension and contraction of the jacking device.

[0025] After adopting the above structure, by setting up a plurality of groups of wheel assemblies 2, the plurality of groups of wheel assemblies 2 are simultaneously driven to rotate by the same drive shaft 1 to continuously roll the paved road surface 4, thereby improving the rolling efficiency; at the same time, a loading device 24 is set on each group of wheel assemblies 2, and the distance between the axle of the simulated wheel 22 and the paved road surface 4 is controlled by the loading device 24, thereby controlling the rolling pressure, simulating the extrusion deformation of the wheel tire and the ground under the loading state, thereby realizing precise control of the loading value.

[0026] In order to achieve accurate control of the loading value and monitor the pressure of the paved road surface 4 at the same time, a plurality of sensors are pre-buried between the pavement layer and the roadbed of the paved road surface 4. By setting the sensors, the pressure can be sensed.

[0027] A protective tube 13 is arranged outside the driving shaft 1, the bottom of the protective tube 13 is fixed on the ground, a thrust ball bearing is fixed on the top of the protective tube 13, and the bottom of the cantilever 23 is supported above the thrust ball bearing. By arranging the thrust ball bearing, a support point is added to the cantilever 23, thereby preventing the cantilever 23 from being deformed by force and improving the supporting force.

[0028] Embodiment 2:

[0029] In this embodiment, in order to prevent the paved road 4 from being partially damaged and causing small stones to affect the device, a shock absorbing device is provided between the wheel bracket 21 and the simulated wheel 22. The shock absorbing device can refer to the shock absorbing device of the car. In this embodiment, in order to simplify the shock absorbing device, the wheel bracket 21 includes an upper sliding frame 211 slidably mounted on the cantilever 23 with upper and lower limits and a lower sliding frame 212 rotatably mounted on the wheel axle. A plurality of guide shafts 213 are fixed on the lower sliding frame 212. The upper sliding frame 211 is provided with a guide hole. The guide shaft 213 passes through and is slidably mounted in the guide hole. The lower sliding frame 212 is hoisted on the upper sliding frame 211 through the guide shaft 213. A return spring 214 is clamped between the upper sliding frame 211 and the lower sliding frame 212.

[0030] When bumps occur, the guide shaft 213 can slide upward along the guide hole, the upper sliding frame 211 can rise, and then reset under the action of the reset spring 214, and be pressed against the paved road surface 4 again.

[0031] The utility model discloses an accelerated loading test device for mixture, which solves the technical problems in the prior art that the loading value control is inaccurate and the wheels are unloaded, thus causing energy waste. The utility model uses a plurality of groups of wheel assemblies to roll the circular road surface at the same time, thereby improving the work efficiency. A loading device is arranged on each group of wheel assemblies, thereby realizing accurate control of the loading value.

[0032] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. An accelerated loading test equipment for a mixture, characterized in that: It includes a driving shaft rotatably mounted on the ground and a rotation driving device for driving the driving shaft to rotate; A plurality of wheel assemblies are arranged at the same radial position on the circumference of the drive shaft, and the wheel assemblies include a wheel bracket and a simulated wheel rotatably mounted on the wheel bracket; the simulated wheel rotates with the drive shaft as the center of the circle; The wheel bracket is connected to the drive shaft through a cantilever, and the wheel bracket is slidably mounted on the cantilever with upper and lower limits. A loading device is provided between the wheel bracket and the cantilever, and the loading device adjusts the distance between the axle of the simulated wheel and the paved road surface.

2. The accelerated loading test equipment for a mixture according to claim 1, characterized in that: The loading device comprises a lifting device fixedly mounted on the cantilever, and an output shaft of the lifting device is fixed on the wheel bracket.

3. The accelerated loading test equipment for a mixture according to claim 1, characterized in that: A plurality of sensors are embedded between the pavement layer and the roadbed of the paved road.

4. The accelerated loading test equipment for a mixture according to claim 1, characterized in that: The wheel assemblies are arranged in four groups, each group of the wheel assemblies comprises two simulation wheels, and the two simulation wheels are arranged coaxially.

5. The accelerated loading test equipment for a mixture according to claim 1, characterized in that: A shock absorbing device is arranged between the wheel bracket and the simulation wheel.

6. The accelerated loading test equipment for a mixture according to claim 5, characterized in that: The wheel bracket includes an upper sliding frame slidably installed on the cantilever up and down and a lower sliding frame rotatably installed on the wheel axle, a plurality of guide shafts are fixed on the lower sliding frame, a guide hole is provided on the upper sliding frame, the guide shaft passes through and is slidably installed in the guide hole, and a return spring is clamped between the upper sliding frame and the lower sliding frame.

7. The accelerated loading test equipment for a mixture according to claim 1, characterized in that: A protective cylinder is arranged outside the driving shaft, the bottom of the protective cylinder is fixed on the ground, a thrust ball bearing is fixed on the top of the protective cylinder, and the bottom of the cantilever is supported above the thrust ball bearing.

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