Thin-layer asphalt mixture wheel rolling forming equipment

Abstract

The utility model discloses thin-layer asphalt mixture wheel rolling forming equipment which comprises a supporting frame, a guide rail is arranged on the surface of the supporting frame, a material conveying trolley is arranged on the guide rail in a sliding mode, the rear end of the material conveying trolley is connected with a driving assembly, and a forming test mold is fixed in the material conveying trolley. A tire rolling assembly is loaded above the forming test mold through a pneumatic pressurizing assembly; the tire rolling assembly is used for effectively simulating asphalt mixture on-site pavement rubber wheel rolling forming, the phenomenon that mixture aggregate is damaged under steel wheel rolling can be effectively prevented, meanwhile, asphalt mixture rubber wheel rolling slurry extraction can be achieved indoors through the equipment, the non-wheel-sticking effect is achieved, the equipment is more suitable for thin-layer asphalt mixture indoor forming, and the production efficiency is improved. The forming equipment is simple in structure, the thin-layer asphalt mixture can be effectively compacted, so that large aggregates in the asphalt mixture can reach the effect of standing on the ground, and the technical problems that the thin-layer asphalt mixture is not compactly rolled or the large aggregates are damaged and the like in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of indoor preparation of asphalt mixture, in particular to a wheel rolling forming device for thin-layer asphalt mixture. Background Technique

[0002] Asphalt pavements are widely used in various grades of roads and squares due to their advantages such as comfortable driving, good visual effect, low noise, and the ability to directly open to traffic after maintenance. However, under the action of traffic loads and natural environmental conditions, diseases such as looseness, cracking, damage, potholes, and ruts are always inevitable on the road surface, which not only affects the normal use of the road but also seriously endangers traffic safety. Therefore, the maintenance, preventive maintenance, or upgrade and transformation of asphalt mixture pavements have become a major issue in current highway construction work. With the development of economy and technology, thin-layer asphalt pavements or ultra-thin asphalt pavements are increasingly used as preventive maintenance due to their economic durability advantages.

[0003] The development of thin-layer asphalt pavements or ultra-thin asphalt pavements has driven the experimental detection and evaluation of thin-layer asphalt mixtures. The traditional asphalt mixture forming mainly includes Marshall compaction forming, gyratory compaction forming, shear compaction forming, and wheel rolling forming. In the process of designing the mix ratio, Marshall compaction forming or gyratory compaction forming is mostly used. When verifying the road performance, wheel rolling forming is also an essential forming method. The current wheel rolling forming in China mainly refers to the steel wheel rolling in the actual construction process, and the steel wheel is used for indoor forming, which cannot simulate the compaction state of the rubber-tyred roller. Moreover, in the process of forming thin-layer asphalt mixture by steel wheel rolling, the phenomenon of stress concentration of coarse aggregates is likely to occur, resulting in the crushing of coarse aggregates, and further leading to the situation of grading variation and incomplete compaction. Furthermore, it is impossible to simulate the forming of thin-layer pavement indoors, resulting in the high-temperature rutting test still using 5 cm thick specimens for evaluation, and the credibility of specimen detection and evaluation is poor. Content of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a wheel rolling forming device for thin-layer asphalt mixture with simple structure and convenient operation, so as to solve the technical problems such as incomplete compaction or crushing of coarse aggregates caused by the inability to simulate rubber-tyred roller compaction forming indoors in the existing technology.

[0005] To achieve the above purpose, the utility model provides the following scheme:

[0006] The utility model provides a wheel rolling forming device for thin-layer asphalt mixture, which comprises a support frame. A guide rail is arranged on the surface of the support frame. A material transporting trolley is slidably arranged on the guide rail. The rear end of the material transporting trolley is connected with a driving assembly. A forming test die is fixed inside the material transporting trolley. A tire rolling assembly is loaded above the forming test die through a pneumatic pressurizing assembly. The device further comprises a control system which respectively establishes communication with the driving assembly and the pneumatic pressurizing assembly, and the control system is provided with an operation interface.

[0007] Preferably, the support frame is welded by angle steel and steel plates, and the guide rail is arranged on the surface of the steel plates.

[0008] Preferably, the material transporting trolley comprises a trolley body. A guide rail clamping groove is arranged at the bottom of the trolley body. The guide rail clamping groove is matched with the guide rail, and rollers are arranged at equal intervals in the guide rail clamping groove. Stopping strips are arranged on the left and right sides and the rear side of the upper surface of the trolley body. Plug heads are arranged at both ends of the front side of the upper surface of the trolley body, and fixing strips are connected to the plug heads through quick-release fixing bolts.

[0009] Preferably, the driving assembly comprises a motor, and the power end of the motor is in transmission connection with the trolley body through a swing arm.

[0010] Preferably, the forming test die comprises a bottom plate, and side dies are fixed around the upper surface of the bottom plate through bolts.

[0011] Preferably, a backing plate is arranged inside the forming test die.

[0012] Preferably, support members are fixed on both the front and rear sides of the forming test die.

[0013] Preferably, the pneumatic pressurizing assembly comprises a loading reaction frame which is arranged on the upper part of the support frame. A vertical loading cross beam is slidably arranged on the loading reaction frame. The tire rolling assembly is arranged on the vertical loading cross beam. A pneumatic pressure head is arranged at the top of the loading reaction frame. The pneumatic pressure head is connected with the vertical loading cross beam and is connected with an air compressor through a pneumatic servo controller.

[0014] Preferably, the tire rolling assembly comprises a tire support frame which is connected with the vertical loading cross beam. A double-wheel group hard silicone tire is rotatably arranged at the lower part of the tire support frame through a bearing. The double-wheel group hard silicone tires are distributed in the form of 4 in the front and 5 in the rear.

[0015] The utility model has obtained the following beneficial technical effects compared with the prior art:

[0016] (1) The wheel rolling forming equipment for thin-layer asphalt mixture adopted has a simple structure, reasonable design, and simple installation and operation. It uses an oil-free silent air compressor to provide linear load, with precise control and low mechanical noise during the specimen forming process, which is beneficial to the physical and mental health of the operator.

[0017] (2) The equipment can independently control the magnitude of the linear load in the pressurization system through the operation interface to simulate the on-site compaction conditions of rubber-tyred rollers of different tonnages. At the same time, the number of loading round trips can be controlled, and the operation is safe and simple.

[0018] (3) The rolling wheel group adopts a double-wheel group of 4 in the front and 5 in the rear to achieve repeated rolling of the tire gap overlap section, which can effectively prevent the generation of rolling wheel marks. The material of the outer wheel can meet different loading requirements, and at the same time, the phenomenon of non-sticking wheels is achieved, avoiding the problem that the release paper that needs to be placed between the rolling wheel and the asphalt mixture in the past is difficult to remove. The macroscopic characteristics and microstructural characteristics of the formed specimen are closer to those of the actual road surface, which is convenient for subsequent test detections such as surface microtexture.

[0019] (4) Through the setting of the backing plate, the rolling forming thickness can be adjusted to correspond to the forming thickness of the on-site thin-layer road surface. At the same time, the formed specimens can be combined with other road surface solid specimens of different thicknesses or materials to form combined specimens for subsequent test detections.

[0020] (5) The thin-layer asphalt mixture specimen formed by this equipment can effectively simulate the slurry raising effect of on-site rubber-tyred rolling. On the premise of ensuring that the coarse aggregate is not damaged, it realizes rearrangement and combination, overcomes the problem of coarse aggregate segregation brought about by the mixing and loading stages, and achieves the effect of rolling compaction.

[0021] (6) The preparation method adopted by the present utility model has simple steps, reasonable design, and easy operation. The thin-layer asphalt mixture specimens prepared are dense and the surface texture has a good correlation with the on-site rubber-tyred compacted asphalt road surface. It includes eight steps, the process parameters of each step are reasonably designed, easy to implement, and easy to control, and the preparation process is safe and reliable. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of the wheel rolling forming equipment for thin-layer asphalt mixture provided by the present utility model;

[0024] Figure 2Schematic diagram of the lower structure of the wheel rolling forming equipment for thin-layer asphalt mixture provided by the present utility model;

[0025] Figure 3 Schematic diagram of the material transportation trolley structure in the wheel rolling forming equipment for thin-layer asphalt mixture provided by the present utility model;

[0026] Figure 4 Schematic diagram of the forming test mold structure in the wheel rolling forming equipment for thin-layer asphalt mixture provided by the present utility model;

[0027] Figure 5 Schematic diagram of the backing plate structure in the wheel rolling forming equipment for thin-layer asphalt mixture provided by the present utility model;

[0028] Figure 6 Schematic diagram of the tire rolling assembly structure in the wheel rolling forming equipment for thin-layer asphalt mixture provided by the present utility model. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] The purpose of the present utility model is to provide a wheel rolling forming equipment for thin-layer asphalt mixture to solve the problems existing in the prior art.

[0031] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0032] Embodiment 1:

[0033] This embodiment provides a wheel rolling forming equipment for thin-layer asphalt mixture, as Figure 1 and 2 shown, including a support frame 1. A guide rail 9 is provided on the surface of the support frame 1. A material transportation trolley 8 is slidably provided on the guide rail 9. The rear end of the material transportation trolley 8 is connected to a driving component 6. A forming test mold 5 is fixed inside the material transportation trolley 8. A tire rolling assembly 4 is loaded above the forming test mold 5 through a pneumatic pressurizing component 3. It further includes a control system 2. The control system 2 establishes communication with the driving component 6 and the pneumatic pressurizing component 3 respectively. The control system 2 is provided with an operation interface 2-1.

[0034] Specifically, the support frame 1 is welded by angle steel and steel plates, and the guide rail 9 is arranged on the surface of the steel plate.

[0035] Furthermore, asFigure 3 As shown, the material transport trolley 8 includes a trolley body, a guide rail slot 8-1 is provided at the bottom of the trolley body, the guide rail slot 8-1 cooperates with the guide rail 9, and rollers 8-2 are evenly spaced in the guide rail slot 8-1, and the left and right sides and the rear side of the upper surface of the trolley body are provided with stop bars 8-3, wherein the inner margin of the left and right side stop bars 8-3 is 312mm. Plugs 8-4 are provided at both ends of the front side of the upper surface of the trolley body, and the plugs 8-4 are connected to the fixing bars 8-6 through quick-release fixing bolts 8-5.

[0036] Furthermore, the driving assembly 6 includes a motor 6-1, and the power end of the motor 6-1 is transmission-connected to the trolley body through a swing arm 6-2.

[0037] Furthermore, if Figure 4 As shown, the forming test mold 5 includes a bottom plate 5-1, which is a steel plate with a length of 310 mm, a width of 310 mm, and a thickness of 5 mm. The upper surface of the bottom plate 5-1 is fixed with a side mold 5-2 by bolts 5-3, and the side mold 5-2 is a steel plate with a length of 310 mm, a height of 50 mm, and a thickness of 10 mm.

[0038] Furthermore, if Figure 5 As shown, a backing plate 5-4 is provided in the forming test mold 5, and the backing plate 5-4 is a steel plate with a length of 298 mm, a width of 298 mm, and a thickness of 5 mm.

[0039] Furthermore, support members 7 are fixed on both the front and rear sides of the forming test mold 5. The support members 7 are L-shaped steel and are fixed to the middle position of the front and rear side molds of the test mold 5 by bolts. At the same time, it can ensure that when one of the front and rear hard silicone tire groups drives out of the test mold, the other group of hard silicone tire groups can run smoothly on the support device.

[0040] Furthermore, the pneumatic pressurizing assembly 3 includes a loading reaction frame 3-4, which is arranged on the upper part of the support frame 1. A vertical loading beam 3-5 is slidably provided on the loading reaction frame 3-4, and a tire crushing assembly 4 is provided on the vertical loading beam 3-5. A pneumatic pressure head 3-2 is provided on the top of the loading reaction frame 3-4, and the pneumatic pressure head 3-2 is connected to the vertical loading beam 3-5 and is connected to the air compressor 3-1 through a pneumatic servo controller 3-3. The air compressor 3-1 adopts an oil-free silent air compressor.

[0041] Furthermore, if Figure 6As shown in the figure, the tire rolling component 4 includes a tire bracket 4-1. The tire bracket 4-1 is connected to the vertical loading cross beam 3-5. A double-wheel group hard silicone tire 4-3 is rotatably provided at the lower part of the tire bracket 4-1 through a bearing 4-2. The double-wheel group hard silicone tires 4-3 are distributed in the form of 4 in the front and 5 in the back. The double-wheel group hard silicone tire 4-3 is a tire with a 1 cm thick silicone on the outside of the middle steel wheel. The silicone is high-strength high-temperature resistant silicone, and its hardness should be controlled between 60HA and 70HA, and the high-temperature resistance should be controlled above 160 °C.

[0042] This embodiment also provides a method for forming a thin-layer asphalt mixture by wheel rolling, including the following steps:

[0043] A. Assemble the forming test mold, install the support on the forming test mold, place the backing plate in the forming test mold and preheat it;

[0044] B. Lay the release paper above the backing plate in the forming test mold and inside the side mold of the forming test mold;

[0045] C. Place the backing plate and the calculated weight of the asphalt mixture in the forming test mold according to the height of the specimen to be formed;

[0046] D. Manually pre-compress the asphalt mixture to make it in a bulging shape with a high middle and low sides;

[0047] E. Place the forming test mold at a fixed position on the transport trolley, place the fixing strip and tighten the quick-release fixing bolts;

[0048] F. Control the pneumatic pressurizing component through the operation interface to make the tire rolling component apply a certain linear load on the surface of the asphalt mixture;

[0049] G. Control the driving component through the operation interface to drive the transport trolley to make a fixed number of round trips at a certain speed;

[0050] H. After the round trip movement ends, the pneumatic pressurizing component automatically relieves the pressure and lifts the tire rolling component. The specimen forming is completed and the precast thin-layer asphalt mixture specimen is taken out.

[0051] The present utility model uses specific examples to elaborate on the principle and implementation manner of the present utility model. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A wheel rolling forming device for thin-layer asphalt mixture, characterized in that: It includes a support frame, the surface of which is provided with a guide rail, a material transport trolley is slidably provided on the guide rail, the rear end of the material transport trolley is connected to a driving component, a forming test mold is fixed in the material transport trolley, a tire crushing component is loaded above the forming test mold through a pneumatic pressurizing component, and also includes a control system, the control system establishes communication with the driving component and the pneumatic pressurizing component respectively, and the control system is provided with an operation interface.

2. The wheel rolling forming equipment for thin-layer asphalt mixture according to claim 1, characterized in that: The support frame is welded by angle steel and steel plate, and the guide rail is arranged on the surface of the steel plate.

3. The wheel rolling forming equipment for thin-layer asphalt mixture according to claim 1, characterized in that: The material transport trolley includes a trolley body, a guide rail slot is provided at the bottom of the trolley body, the guide rail slot cooperates with the guide rail, and rollers are evenly spaced in the guide rail slot, and the left and right sides and the rear side of the upper surface of the trolley body are provided with stop bars, and the two ends of the front side of the upper surface of the trolley body are provided with plugs, and the plugs are connected to the fixing bars through quick-release fixing bolts.

4. The slab compactor for thin layer asphalt mixture according to claim 3, characterized in that: The driving assembly includes a motor, and a power end of the motor is transmission-connected to the trolley body through a swing arm.

5. The wheel rolling forming device for thin-layer asphalt mixture according to claim 3, characterized in that: The molding test mold comprises a bottom plate, and side molds are fixed around the upper surface of the bottom plate by bolts.

6. The wheel rolling forming device for thin-layer asphalt mixture according to claim 5, wherein: A backing plate is arranged in the molding test mold.

7. The wheel rolling forming equipment for thin-layer asphalt mixture according to claim 5, characterized in that: Supporting pieces are fixed on both the front and rear sides of the molding test mold.

8. The wheel rolling forming equipment for thin-layer asphalt mixture according to claim 1, wherein: The pneumatic pressurizing assembly includes a loading reaction frame, which is arranged on the upper part of the support frame. A vertical loading beam is slidably provided on the loading reaction frame, and the tire crushing assembly is provided on the vertical loading beam. A pneumatic pressure head is provided on the top of the loading reaction frame, and the pneumatic pressure head is connected to the vertical loading beam and connected to the air compressor through a pneumatic servo controller.

9. The wheel rolling forming device for thin-layer asphalt mixture according to claim 8, characterized in that: The tire crushing assembly includes a tire bracket, which is connected to the vertical loading beam. The lower part of the tire bracket is rotatably provided with a double-wheel set of hard silicone tires through a bearing, and the double-wheel set of hard silicone tires are distributed in the form of 4 in the front and 5 in the rear.

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