A molding die for rutted specimens

Abstract

This utility model belongs to the field of road engineering testing, and specifically discloses a mold for forming rutted specimens. It includes a main body of the mold formed by a base plate and several first side plates connected together; at least some of the first side plates are connected to the base plate by a single-degree-of-freedom rotational method; it also includes a fixing frame formed by several second side plates sequentially fixedly connected and enclosing each other; each first side plate corresponds to a second side plate and is joined vertically by a butt joint structure, forming a cubic cavity structure with an open top after joining; a push plate is embedded in the base plate, and the push plate is connected to a drive plate placed outside the main body of the mold and driven by the drive plate to generate an upward pushing force on the specimen in the main body of the mold. This utility model facilitates the assembly, disassembly, and demolding of the mold.

Description

Technical Field

[0001] This utility model belongs to the field of road engineering testing, and specifically relates to a molding die for rut specimens. Background Technology

[0002] With the continuous increase in traffic volume and the expansion of the proportion of heavy vehicles in my country, coupled with the impact of complex climatic conditions, rutting of asphalt pavements has become a core issue restricting road durability. Rutting tests, as a core testing method for characterizing the high-temperature stability of asphalt mixtures, can quantitatively assess the material's resistance to permanent deformation and load-bearing characteristics by simulating pavement deformation behavior under vehicle loads, providing crucial data support for road structure design, construction process optimization, and maintenance strategy formulation.

[0003] Current laboratory standard wheel rutting molds typically employ a cubic structure of 300mm × 300mm × (50-100)mm. The increased height of the mold significantly complicates demolding. Traditional forming molds use a four-panel assembly method, with bolts securing each panel layer by layer. Multiple sets of bolts are also required to fix the base plate to the side molds. Demolding necessitates the sequential removal of all fasteners, resulting in a cumbersome and time-consuming process. More seriously, frequent bolt removal and installation can lead to wear on the connecting surfaces, widening the gap between the side plates and the base plate. This can cause overall mold deformation during wheel rolling, directly affecting the dimensional accuracy of the specimen and the reliability of the test data.

[0004] The aforementioned technical issues need to be addressed. Utility Model Content

[0005] Technical problems to be solved

[0006] In order to overcome the technical problems mentioned in the background, this utility model proposes a rut specimen molding mold, which facilitates the assembly, disassembly and demolding of the mold.

[0007] Technical solution

[0008] Therefore, this utility model provides a rut specimen molding mold, including a mold body formed by connecting a base plate and several first side plates;

[0009] At least some of the first side plates are connected to the bottom plate in a single-degree-of-freedom rotation manner; it also includes a fixed frame formed by a number of second side plates that are fixedly connected and enclosed in sequence; each of the first side plates and the second side plates correspond one to one and are connected vertically through a docking structure, and after docking, they enclose to form a cubic cavity structure with a top opening of the test mold body;

[0010] A push plate is embedded in the base plate. The push plate is connected to a drive plate located outside the mold body and is driven by the drive plate to generate an upward thrust on the specimen in the mold body.

[0011] As a further improvement to the technical solution of this utility model, the push plate is fixedly connected to the drive plate, the drive plate extends along the length direction of the push plate and passes through the through hole opened on the bottom plate and / or the first side plate; the push plate and the bottom plate are rotatably connected by a rotating shaft, so that the push plate forms a lever structure.

[0012] As a further improvement to the technical solution of this utility model, the upper surface of the base plate is provided with a sinking groove that communicates with the through hole, and the push plate is adapted to the sinking groove and placed into the sinking groove.

[0013] As a further improvement to the technical solution of this utility model, the drive plate includes a number of hollow drive blocks nested sequentially along the length direction, so that the drive plate forms a telescopic structure with adjustable length; wherein the innermost drive block is fixedly connected to the push plate, and the outermost drive block is adapted to the through hole, so that the drive plate is embedded in the through hole after being fully retracted.

[0014] As a further improvement to the technical solution of this utility model, it also includes a solid force-applying plate, which is adapted to the hollow structure of the drive plate and can extend into the hollow structure after the drive plate is fully extended.

[0015] As a further improvement to the technical solution of this utility model, at least two symmetrical push plates are provided on the base plate.

[0016] As a further improvement to the technical solution of this utility model, the docking structure includes a convex locking strip disposed on the top of the first side plate and a concave locking groove disposed on the bottom of the second side plate that is adapted to the convex locking strip.

[0017] As a further improvement to the technical solution of this utility model, the first side plate and the bottom plate are vertically fixedly connected or rotatably connected by a hinge.

[0018] As a further improvement to the technical solution of this utility model, the bottom plate, the first side plate and the second side plate are all rectangular plate structures.

[0019] As a further improvement to the technical solution of this utility model, a first handle is provided on the first side plate rotatably connected to the base plate, and a second handle is provided on a portion of the second side plate.

[0020] Beneficial effects

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] This utility model provides a molding die for tire rut specimens, in which some or all of the first side plates are connected to the base plate by a single-degree-of-freedom rotation, and the position of the first side plates is locked by the docking action of the fixed frame, so that the main body of the mold can be formed. This structure is simple, easy to use, and improves assembly and demolding efficiency. At the same time, the fixed frame can increase the overall height of the mold, so the height can be adjusted as needed to meet different test requirements, increasing the utilization rate of the device and reducing unnecessary equipment costs. The push plate generates an upward pushing force on the specimen in the main body of the mold, making demolding easier and more convenient. Attached Figure Description

[0023] Figure 1 This is a first structural schematic diagram of the present invention;

[0024] Figure 2 This is a schematic diagram of the second structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the prototype mold body of this utility model;

[0026] Figure 4 This is a connection diagram of the push plate and the main body of the trial mold of this utility model;

[0027] Figure 5 This is a schematic diagram of the push plate of this utility model. Detailed Implementation

[0028] The utility model will now be further described with reference to the accompanying drawings.

[0029] Example

[0030] like Figures 1 to 5 As shown: This embodiment provides a rut specimen molding mold, including a mold body formed by connecting a base plate 1 and several first side plates 2; the main structure and operating principle of the mold body are the same as those of the prior art, and will not be described in detail here.

[0031] The key point is that the rut specimen molding mold provided in this embodiment is at least partially connected to the first side plate 2 and the bottom plate 1 by a single degree of freedom rotation; it also includes a fixed frame formed by a number of second side plates 3 being fixedly connected and enclosed in sequence; each of the first side plates 2 and the second side plates 3 are one-to-one and are connected vertically by a docking structure, and after docking, they enclose to form a cubic cavity structure with a top opening of the mold body; a push plate 4 is embedded on the bottom plate 1, and the push plate 4 is connected to a drive plate 5 placed outside the mold body and driven by the drive plate 5 to generate an upward thrust on the specimen in the mold body.

[0032] The shape of the fixing frame corresponds to the main body of the mold. For example, when the main body of the mold is a cuboid structure (open at the top), the fixing frame is also a cuboid structure (open at both the top and bottom). Preferably, the base plate 1, the first side plate 2, and the second side plate 3 can all be rectangular plate structures. In this case, there are four first side plates 2, which can be connected in sequence to form a rectangular frame, and there are four second side plates 3, which can be fixedly connected by welding to form a rectangular frame.

[0033] The first side plate 2 and the base plate 1 are connected by a vertical fixed connection in part and a rotatable connection in part via a hinge 6. In this embodiment, the left and right first side plates 2 are rotatably connected to the base plate 1, and the front and rear first side plates 2 are fixedly connected to the base plate 1. The first side plate 2 rotatably connected to the base plate 1 is provided with a first handle 9, and some of the second side plates 3 are provided with a second handle 10, both for convenient application of force. At least two symmetrical push plates 4 can be provided on the base plate 1. The push plates 4 are preferably located on the front and rear sides of the base plate 1, i.e., away from the first side plates 2 rotatably connected to the base plate 1, to prevent interference.

[0034] The docking structure between the first side plate 2 and the second side plate 3 includes a convex retaining strip 7 at the top of the first side plate 2 and a concave retaining groove 8 at the bottom of the second side plate 3 that is adapted to the convex retaining strip 7. The convex retaining strip 7 can be fully embedded in the concave retaining groove 8, so that the first side plate 2 and the second side plate 3 are connected in a manner that aligns with the inner wall, and the movement of the first side plate 2 is effectively restricted.

[0035] The first side plate 2 is partially or completely connected to the base plate 1 by a single-degree-of-freedom rotation, and the position of the first side plate 2 is locked by the docking action of the fixed frame, so that the main body of the test mold can be formed. This structure is simple, easy to use, and improves assembly and demolding efficiency. At the same time, the fixed frame can increase the overall height of the test mold, so the height can be adjusted as needed to meet different test requirements, increase the utilization rate of the device, and reduce unnecessary equipment costs. The push plate 4 generates an upward pushing force on the specimen in the main body of the test mold, making demolding easier and more convenient.

[0036] Specifically, in use, the first side plate 2 on the left and the first side plate 2 on the right are firstly joined vertically together by hinge 6. Then, according to the height requirements of the test specimen, a fixed frame of appropriate height is selected. The main body of the mold and the fixed frame are connected by concave groove 8 and convex strip 7. Asphalt mixture is prepared according to the test requirements and poured into the mold cavity in a standardized manner. After the specimen is formed and cured for the required test time, a rutting test is conducted. After the rutting test is completed, the fixed frame is tapped to make it move and then pried open with a steel ruler. The second handle is pulled out and removed to complete the disassembly of the fixed frame. Then, the first handle is manually pulled open to unfold the movable first side plate 2. Afterwards, the push plate 4 is driven by the drive plate 5 to gently lift the specimen in the mold cavity, which facilitates the rapid demolding of the specimen.

[0037] In this embodiment, the push plate 4 is fixedly connected to the driving plate 5. The driving plate 5 extends along the length direction of the push plate 4 and passes through a through hole 11 formed in the bottom plate 1 (and / or the corresponding first side plate 2). The push plate 4 is rotatably connected to the bottom plate 1 through a rotating shaft 12, so that the push plate 4 forms a lever structure. The rotating shaft 12 can be arranged on the inner wall of the bottom plate 1. Taking the rotating shaft as the boundary, the driving plate 5 and the part of the push plate 4 on the side of the rotating shaft 12 close to the driving plate 5 are the power arms of the lever structure, and the part of the push plate 4 on the side of the rotating shaft 12 far from the driving plate 5 is the resistance arm of the lever structure. By applying a downward pressure to the power arm, the resistance arm can move upward, thereby generating an upward thrust. Of course, the through hole 11 has sufficient clearance to enable the lever movement to be realized. To prevent leakage, a flexible isolation layer (such as rubber) can be provided at the through hole 11, and of course, other methods can also be used.

[0038] In this embodiment, a sinking groove 13 communicating with the through hole 11 is provided on the upper surface of the bottom plate 1. The push plate 4 is adapted to the sinking groove 13 and is placed in the sinking groove 13. The push plate 4 can be of a rectangular plate structure, and at this time, the sinking groove 13 is also rectangular. Preferably, the sinking groove 13 and the through hole 11 are integrally arranged. The height and length of the sinking groove 13 are greater than those of the push plate 4, so that the push plate 4 can rotate within a certain angle range. In the idle state, the upper surface of the push plate 4 is flush with the upper surface of the bottom plate 1. When forming, to prevent the asphalt mixture from leaking into the sinking groove 13 and the through hole 11, a layer of isolation paper can be laid on the upper surface of the sinking groove 13 and the mouth of the through hole 11. The thickness of the isolation paper is relatively thin and will not affect the forming of the specimen. Of course, other methods can also be used.

[0039] In this embodiment, the driving plate 5 includes a plurality of driving blocks 5a with hollow structures nested in sequence along the length direction, so that the driving plate 5 forms a telescopic structure with adjustable length. The driving block 5a located in the innermost part is fixedly connected to the push plate 4, and the driving block 5a located in the outermost part is adapted to the through hole 11, so that the driving plate 5 is embedded in the through hole 11 after being fully contracted. The number of driving blocks 5a can be determined according to needs. The longitudinal section of the driving block 5a can be a "return" - shaped structure, and its size gradually increases from the inside to the outside. The next - level driving block 5a can be sleeved on the previous - level driving block 5a, and there is a limiting structure (such as the matching structure of concave - convex snap rings) to prevent them from separating. The driving block 5a located in the innermost part can be integrally formed with the push plate 4. With this structure, not only can the length of the power arm be adjusted according to needs, but the through hole 11 can also be temporarily blocked to prevent leakage accidents during the forming process. A pulling block 15 can also be connected to the outermost driving block 5a to facilitate pulling out the driving block 5a.

[0040] In this embodiment, a solid force-applying plate 14 is also included. The force-applying plate 14 is adapted to the hollow structure of the drive plate 5 and can be inserted into the hollow structure after the drive plate 5 is fully extended. After the drive plate 5 is fully extended, the force-applying plate 14 can be inserted into the drive plate 5 to strengthen the structural strength of the drive plate 5 and improve its overall bending resistance.

[0041] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A molding die for a rut specimen, comprising a main body of the die formed by connecting a base plate and several first side plates; characterized in that: At least some of the first side plates are connected to the bottom plate in a single-degree-of-freedom rotation manner; it also includes a fixed frame formed by a number of second side plates that are fixedly connected and enclosed in sequence; each of the first side plates and the second side plates correspond one to one and are connected vertically through a docking structure, and after docking, they enclose to form a cubic cavity structure with a top opening of the test mold body; A push plate is embedded in the base plate. The push plate is connected to a drive plate located outside the mold body and is driven by the drive plate to generate an upward thrust on the specimen in the mold body.

2. The molding die for a rutted specimen according to claim 1, characterized in that: The push plate is fixedly connected to the drive plate, and the drive plate extends along the length of the push plate and passes through the through hole opened on the bottom plate and / or the first side plate; the push plate and the bottom plate are rotatably connected by a rotating shaft, so that the push plate forms a lever structure.

3. The molding die for a rutted specimen according to claim 2, characterized in that: The upper surface of the base plate is provided with a sink groove that communicates with the through hole, and the push plate is adapted to the sink groove and placed into the sink groove.

4. The molding die for a rutted specimen according to claim 3, characterized in that: The drive plate includes several hollow drive blocks nested sequentially along its length, forming a telescopic structure with an adjustable length. The innermost drive block is fixedly connected to the push plate, and the outermost drive block is adapted to the through hole, so that the drive plate is embedded in the through hole after it is fully retracted.

5. The rut specimen molding mold according to claim 4, characterized in that: It also includes a solid force-applying plate, which is adapted to the hollow structure of the drive plate and can extend into the hollow structure after the drive plate is fully extended.

6. The molding die for a rutted specimen according to claim 2, characterized in that: At least two symmetrical push plates are provided on the base plate.

7. A molding die for a rutted specimen according to any one of claims 1 to 6, characterized in that: The docking structure includes a convex locking strip on the top of the first side plate and a concave locking groove on the bottom of the second side plate that is adapted to the convex locking strip.

8. A molding die for a rutted specimen according to any one of claims 1 to 6, characterized in that: The first side plate is vertically fixed to the bottom plate or is rotatably connected by a hinge.

9. A molding die for a rutted specimen according to any one of claims 1 to 6, characterized in that: The base plate, the first side plate, and the second side plate are all rectangular plate structures.

10. A molding die for a rutted specimen according to any one of claims 1 to 6, characterized in that: A first handle is provided on the first side plate rotatably connected to the base plate, and a second handle is provided on a portion of the second side plate.

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