Auxiliary device for testing density of asphalt core sample

Abstract

The utility model discloses an auxiliary device for testing the density of an asphalt core sample, which comprises a wax melting pool used for melting a solid wax block to form a wax liquid and maintaining the wax liquid in a molten state; the at least one clamp is positioned in the wax melting pool and is used for grabbing an asphalt core sample; the control arm is rotationally mounted on the side wall of the wax melting pool, one end of the control arm penetrates through the side wall of the wax melting pool and extends into the wax melting pool to be connected with the clamp, the control arm is provided with a control mechanism, and the control mechanism is used for controlling the clamp to clamp the asphalt core sample. The fixture is arranged in the wax melting pool, the fixture is controlled through the control arm and the control mechanism, wax liquid coating of an asphalt core sample can be rapidly completed by rotating the control arm, and wrist injury of a tester can be effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of density testing technology, and in particular to an auxiliary device for density testing of asphalt core samples. Background Technology

[0002] According to the relevant provisions of JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" for testing the density of compacted asphalt mixtures, the wax sealing method should be used when testing the density of asphalt core samples with a water absorption rate greater than 2%.

[0003] In existing technologies, the wax-sealing method for testing the density of asphalt core samples mostly involves the tester holding the asphalt core sample in a clamp, immersing it in molten wax, and then coating the sample by rotating their wrist. This method has certain drawbacks, such as limited wrist rotation and the potential for fatigue or injury to the tester's wrist over prolonged periods. To address these issues, this application proposes an auxiliary device for testing the density of asphalt core samples. Summary of the Invention

[0004] Based on this, in order to solve the problems existing in the prior art, this application provides an auxiliary device for testing the density of asphalt core samples, including a wax melting pool, which is used to melt solid wax blocks to form wax liquid and maintain the wax liquid in a molten state;

[0005] At least one clamp is located inside the molten wax pool and is used to grip the asphalt core sample;

[0006] The control arm is rotatably mounted on the side wall of the molten wax pool. One end of the control arm penetrates the side wall of the molten wax pool and extends into the interior of the molten wax pool to connect with the clamp. The control arm is equipped with a control mechanism, which is used to control the clamp to pick up the asphalt core sample.

[0007] Furthermore, the fixture includes a connecting rod, a mounting block, and at least two grippers. The mounting block is sleeved on the outer wall of the connecting rod, one end of the grippers is hinged to the mounting block, and the other end of the connecting rod is movably inserted into the control arm and connected to the control mechanism.

[0008] Furthermore, the control arm includes a mounting tube, a horn cover, a first connecting tube, a second connecting tube, a third connecting tube, and a rocker arm. The mounting tube, the first connecting tube, the second connecting tube, the third connecting tube, and the rocker arm are connected in sequence. The second connecting tube is rotatably inserted into the side wall of the molten wax pool. The horn cover is installed at the end of the mounting tube away from the first connecting tube. The horn cover makes the end of the mounting tube flared. The other end of the connecting rod is inserted into the mounting tube from the horn cover.

[0009] Furthermore, the control mechanism includes a control component and a wiring hole. One end of the control component is hinged to the rocker arm. The control component is provided with a connecting part. A traction wire is provided inside the mounting tube and the rocker arm. One end of the traction wire is connected to the connecting rod, and the other end passes through the wiring hole and is connected to the connecting part.

[0010] Furthermore, a second elastic element is provided between the connecting rod and the inner wall of the mounting tube. One end of the second elastic element is connected to the connecting rod, and the other end is connected to the inner wall of the mounting tube.

[0011] Furthermore, a heater is installed at the bottom of the molten wax pool and is fixedly connected to the molten wax pool. The heater is used to heat solid wax blocks.

[0012] Furthermore, the outer wall of the molten wax pool is provided with heat insulation components, which are closely attached to the outer wall of the molten wax pool and cover the outside of the molten wax pool.

[0013] Furthermore, a wax discharge gate is also provided on the side wall of the wax melting pool, which is used to allow the remaining wax liquid to flow out after the test is completed.

[0014] Furthermore, one side of the wax discharge gate is installed on the side wall of the wax melting pool via a rotating shaft, and the other side is equipped with a controller, which is used to control the opening and closing of the wax discharge gate.

[0015] Furthermore, a switch is also provided on the side wall of the molten wax pool, which is used to control the heater to turn on and off.

[0016] Beneficial effects: This application sets a fixture in the wax melting pool, and a control arm is rotatably installed on the side wall of the wax melting pool. The fixture is controlled by the control arm and the control mechanism. Rotating the control arm can quickly complete the coating of wax on the asphalt core sample. The side wall of the wax melting pool provides support for the control arm, which can effectively avoid fatigue or damage to the wrists and arms of the test personnel during long-term operation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the auxiliary device for asphalt core sample density testing according to the present invention;

[0019] Figure 2 This is a schematic diagram of the gripper structure of the auxiliary device for asphalt core sample density testing according to the present invention.

[0020] Figure 3This is a schematic diagram of the fixture structure of the auxiliary device for asphalt core sample density testing according to the present invention;

[0021] Figure 4 This is a side view of the auxiliary device for asphalt core sample density testing according to the present invention;

[0022] In the diagram: 1. Molten wax pool; 11. Insulation component; 12. Wax discharge gate; 121. Rotating shaft; 122. Controller; 13. Switch; 2. Clamp; 21. Gripper; 22. Connecting rod; 23. Hinge shaft; 24. Mounting block; 25. First elastic element; 26. Wiring hole; 3. Control arm; 31. Mounting tube; 311. Horn cover; 32. First connecting tube; 33. Rocker arm; 331. Wire hole; 34. Sealed bearing; 35. Second connecting tube; 36. Third connecting tube; 4. Control component; 41. Connecting part; 5. Traction line; 6. Second elastic element; 7. Pulley; 8. Heater.

[0023] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0026] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the term "and / or" throughout the text includes three solutions; taking A and / or B as an example, it includes technical solution A, technical solution B, and a technical solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0027] like Figure 1-4 As shown, this application embodiment provides an auxiliary device for density testing of asphalt core samples, including: a wax melting pool 1, which is used to melt solid wax blocks to form wax liquid and maintain the wax liquid in a molten state;

[0028] At least one clamp 2 is located inside the molten wax pool 1 and is used to grip the asphalt core sample;

[0029] The control arm 3 has a hollow internal structure. The control arm 3 is rotatably mounted on the side wall of the wax melting pool 1. The side wall of the wax melting pool 1 supports the control arm 3. One end of the control arm 3 passes through the side wall of the wax melting pool 1 and extends into the interior of the wax melting pool 1 to connect with the clamp 2. The control arm 3 is equipped with a control mechanism, which is used to control the clamp 2 to pick up the asphalt core sample.

[0030] In this embodiment, two clamps 2 are provided and are positioned opposite each other on two opposite sidewalls of the wax melting pool 1. This allows the tester to use each clamp 2 individually if the current batch of asphalt core samples is small and lightweight, holding one sample in each clamp and testing both samples separately. Conversely, if the current batch of asphalt core samples is large and heavy, the tester can use both clamps 2 together to hold one sample, ensuring stable testing. Typically, the collected asphalt core samples are cylindrical with a large mass and height. For such samples, two clamps 2 can be used simultaneously, one clamp holding one end and the other holding the other, together holding one sample for wax sealing.

[0031] The height of the molten wax inside the molten wax pool 1 should not exceed the connection point between the control arm 3 and the molten wax pool 1.

[0032] During operation, the test personnel can use the wax melting pool 1 to melt and hold the molten wax, keeping the wax in a molten state throughout the entire test. After obtaining the asphalt core sample to be tested, the test personnel can use the control mechanism to control the clamp 2 to hold the asphalt core sample, and then immerse the clamp 2 in the wax. When the asphalt core sample is held in clamp 2, the experimenter rotates control arm 3, causing clamp 2 and the asphalt core sample to rotate together. This immerses the asphalt core sample in molten wax, gradually coating the entire surface of the asphalt core sample. The tester only needs to maintain a relatively slow and uniform speed while rotating clamp 2 to ensure that the molten wax steadily and smoothly contacts the circumference of the asphalt core sample. By maintaining the same number of rotations for the same batch of asphalt core samples, each asphalt core sample can maintain approximately the same contact depth and contact time with the wax. Different asphalt core samples from the same batch can also maintain a wax layer thickness within the allowable error range. It should be noted that the clamping position of the asphalt core sample can be changed after one coating by using another clamp to hold the asphalt core sample, and then coating can be performed again to coat the original clamping position of the asphalt core sample with a wax layer.

[0033] This application sets a clamp 2 in the wax melting pool 1, and a control arm 3 is rotatably installed on the side wall of the wax melting pool 1. The clamp 2 is controlled by the control arm 3 and the control mechanism. Rotating the control arm 3 can quickly complete the coating of wax on the asphalt core sample. The side wall of the wax melting pool 1 provides support for the control arm 3, which can effectively avoid the problem of fatigue or injury to the wrists and arms of the test personnel during long-term operation.

[0034] In one embodiment, the clamp 2 includes a connecting rod 22, a mounting block 24, and at least two grippers 21. The mounting block 24 is fixedly sleeved on one end of the connecting rod and slidably mounted to the inner wall of the control arm 3. The outer diameter of the mounting block 24 is equal to or slightly smaller than the inner diameter of the control arm 3, thereby defining the connecting rod 22 substantially at the axial center of the control arm 3. The mounting block 24 is provided with a groove, one end of the gripper 21 is embedded in the groove and hinged to the mounting block 24, and the other end of the connecting rod 22 is movably inserted into the control arm 3 and connected to the control mechanism.

[0035] In this embodiment, the connecting rod 22 is cylindrical, and the gripper 21 is similar to a crab claw. Two grippers 21 are provided, and the two grippers 21 are symmetrically arranged about the axis of the connecting rod 22. One end of the gripper 21 is hinged to the mounting block 24 through the hinge shaft 23. When there are three or more grippers 21, the grippers 21 are arranged in a circumferential array along the outer wall of the connecting rod 22. The control mechanism can drive the connecting rod 22 to slide in the control arm 3, thereby controlling the gripping and releasing of the grippers 21.

[0036] Optionally, a first elastic element 25 is provided between the gripper 21 and the connecting rod 22 near the hinge shaft. One end of the first elastic element 25 is connected to the outer wall of the connecting rod 22, and the other end is connected to the gripper 21. The first elastic element 25 ensures that the gripper 21 remains open when it is not holding the asphalt core sample, so that the asphalt core sample can be inserted. The first elastic element 25 includes, but is not limited to, a spring, which is in a compressed state.

[0037] The control arm 3 includes a mounting tube 31, a horn cover 311, a first connecting tube 32, a second connecting tube 35, a third connecting tube 36, and a rocker arm 33. The mounting tube 31, first connecting tube 32, second connecting tube 35, third connecting tube 36, and rocker arm 33 are connected sequentially. The second connecting tube 35 is rotatably inserted into the side wall of the molten wax pool 1. The mounting tube 31 is located inside the molten wax pool 1, and the rocker arm 33 is located outside the molten wax pool 1. The rocker arm 33, the third connecting tube 36, and the second connecting tube 35 form a Z-shaped hand crank structure. The horn cover 311 is installed at the end of the mounting tube 31 away from the first connecting tube 35, making the end of the mounting tube 31 flared. The other end of the connecting rod 22 is inserted into the mounting tube 31 from the horn cover 311. In this embodiment, both the mounting tube 31 and the rocker arm 33 are cylindrical. The first connecting tube 32, the second connecting tube 35, and the third connecting tube 36 form a U-shape. The first connecting tube 32 and the third connecting tube 36 are arranged in a vertical plane, while the second connecting tube 35 is arranged horizontally and perpendicular to the side wall of the wax melting pool 1. The length of the first connecting tube 32 is longer than that of the third connecting tube 36, which facilitates the immersion of the asphalt core sample into the wax liquid at a lower liquid level. The mounting tube 31 is arranged perpendicular to the side wall of the wax melting pool 1, and the horn cover 311 is used to cooperate with the gripper 21 to achieve the clamping function.

[0038] Optionally, a sealing bearing 34 is provided at the connection between the second connecting pipe 35 and the side wall of the molten wax pool 1. The sealing bearing 34 not only makes the rotation smoother, but also forms a seal at the connection between the second connecting pipe 35 and the side wall of the molten wax pool 1 to prevent the internal wax liquid from flowing out.

[0039] Specifically, when the gripper 21 needs to grip, the control mechanism drives the connecting rod 22 to slide away from the object being gripped within the mounting tube 31. This causes the gripper 21 to move synchronously. Because the horn cover 311 is constricted, when the gripper 21 moves toward the constricted end of the horn cover 311, the gripper 21 moves closer together due to the constraint of the inner wall of the horn cover 311, thus achieving the gripping effect. Similarly, when the connecting rod 22 slides in the opposite direction within the mounting tube 31, the gripper 21 moves away from each other, thus achieving the release effect of the gripper 21.

[0040] In addition, by shaking the rocker arm 33, the installation tube 31 can be rotated, thereby causing the clamp 2 and the asphalt core sample it grips to roll together, so that the molten wax liquid will gradually cover the entire surface of the asphalt core sample.

[0041] The control mechanism includes a control component 4 and a wire hole 331. One end of the control component 4 is hinged to the rocker arm 33. The control component 4 is provided with a connecting part 41. A traction wire 5 is provided inside the mounting tube 31 and the rocker arm 33. A wiring hole 26 is provided at the end of the connecting rod 22 that is inserted into the horn cover 311. One end of the traction wire 5 is connected to the wiring hole 26 of the connecting rod 22, and the other end passes through the wire hole 331 and is connected to the connecting part 41.

[0042] In this embodiment, the control component 4 is inverted L-shaped, and the outer wall of the rocker arm 33 is provided with an elongated through hole. The lower end of the control component 4 is inserted into the through hole and is hinged to the inner wall of the rocker arm 33 through a shaft. The traction line 5 is a steel wire rope.

[0043] Specifically, when one end of the control component 4 approaches the rocker arm 33, it pulls the traction line 5 outward. At this time, the connecting rod 22 connected to the other end of the traction line 5 will slide away from the object being gripped in the mounting tube 31. This will cause the gripper 21 to move synchronously. Because the horn cover 311 is constricted, when the gripper 21 moves towards the constricted end of the horn cover 311, the gripper 21 will move closer together due to the restriction of the inner wall of the horn cover 311, thereby achieving the gripping effect.

[0044] In this embodiment, pulleys 7 are provided on the inner walls of the corners where the first connecting pipe 32 connects to the mounting pipe 31 and the second connecting pipe 35, and at the corners where the third connecting pipe 36 connects to the second connecting pipe 35 and the rocker arm 33. The rotation axis of the pulleys 7 is parallel to the bending line at the corner of the mounting pipe 31.

[0045] By setting pulley 7, the traction line 5 can be protected, reducing wear on the traction line 5 at the corner inside the mounting tube 31, while also saving effort.

[0046] In one embodiment, a second elastic element 6 is provided between the connecting rod 22 and the inner wall of the mounting tube 31. One end of the second elastic element 6 is connected to the connecting rod 22, and the other end is connected to the inner wall of the mounting tube 31.

[0047] In this embodiment, the second elastic element 6 includes, but is not limited to, a spring, which is in a stretched state.

[0048] By setting the second elastic element 6, when the control element 4 slides the connecting rod 22 away from the object being gripped in the installation tube 31 through the traction line 5, the gripper 21 grips it. At this time, the first elastic element 25 is compressed and the second elastic element 6 is stretched. When it is necessary to cancel the gripping of the asphalt core sample after testing, simply release the control element 4. Under the elastic force of the second elastic element 6, the second elastic element 6 returns to its original position, thereby driving the connecting rod 22 to reset. Under the action of the first elastic element 25, the gripper 21 moves away from each other, realizing the release of the asphalt core sample. At the same time, it also drives the control element 4 and the traction line 5 to reset, and they are always in a pre-tensioned state for the next gripping.

[0049] In one embodiment, a heater 8 is laid at the bottom of the molten wax pool 1 and fixedly connected to the molten wax pool 1. The heater 8 is used to heat solid wax blocks.

[0050] In this embodiment, heater 8 is used to heat the solid wax block to melt it into molten wax. In actual manufacturing, a molten wax pool 1 can be made of a metal material with good thermal conductivity. Heater 8 is placed at the bottom of the molten wax pool 1. The heat generated by heater 8 is conducted through the metallic molten wax pool 1 to the wax block placed in the pool 1. The wax block absorbs heat and melts to form molten wax, which is then stored in the molten wax pool 1. By continuously heating with heater 8 throughout the entire experiment, the molten wax can be kept in a molten state, ensuring the experiment proceeds continuously and stably.

[0051] In one embodiment, the outer wall of the molten wax pool 1 is provided with a heat insulation member 11, which is closely attached to the outer wall of the molten wax pool 1 and covers the outside of the molten wax pool 1.

[0052] In this embodiment, the heat insulation component 11 is heat insulation foam. Encasing the molten wax pool 1 with heat insulation foam helps to minimize heat loss, maintain the temperature of the wax liquid during the test, and prevent the wax liquid from losing temperature and re-solidifying during the test.

[0053] In one embodiment, a wax discharge gate 12 is also provided on the side wall of the wax melting pool 1.

[0054] In this embodiment, a wax outlet gate 12 is provided on the side wall of the molten wax pool 1. After the test, the remaining wax liquid can flow out of the molten wax pool 1 through the wax outlet gate 12. Specifically, the wax outlet gate 12 can be set at the lowest position of the liquid level in the molten wax pool 1 to facilitate the recovery of the wax liquid. During the test, the test personnel can keep the wax outlet gate 12 closed to ensure that the volume of wax liquid in the molten wax pool 1 meets the wax sealing requirements. After the test, the test personnel can open the wax outlet gate 12 before the wax liquid completely solidifies to recover the remaining wax liquid for reuse in the next test.

[0055] In one embodiment, the wax discharge gate 12 is mounted on one side of the side wall of the wax melting pool 1 via a rotating shaft 121, and a controller 122 is provided on the other side. The controller 122 is used to control the opening and closing of the wax discharge gate 12.

[0056] In this embodiment, after the test is completed, the controller 122 can be used to open the wax gate 12 to allow the remaining wax liquid inside to flow out. This eliminates the need for manual opening of the gate and avoids burns to the test personnel.

[0057] In one embodiment, a switch 13 is also provided on the side wall of the wax melting pool 1, which is used to control the opening and closing of the heater 8.

[0058] In this embodiment, the heater 8 can be controlled to heat or be turned off at any time by setting the switch 13.

[0059] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An auxiliary device for density testing of asphalt core samples, characterized in that, include: A wax melting pool is used to melt solid wax blocks to form molten wax and maintain the molten wax in a molten state. At least one clamp located inside the molten wax pool, the clamp being used to grip the asphalt core sample; A control arm is rotatably mounted on the side wall of the molten wax pool. One end of the control arm penetrates the side wall of the molten wax pool and extends into the interior of the molten wax pool to connect with the clamp. The control arm is equipped with a control mechanism for controlling the clamp to pick up the asphalt core sample.

2. The auxiliary device for density testing of asphalt core samples according to claim 1, characterized in that, The clamp includes a connecting rod, a mounting block, and at least two grippers. The mounting block is fixedly sleeved on the outer wall of the connecting rod. One end of each gripper is hinged to the mounting block. The other end of the connecting rod is movably inserted into the control arm and connected to the control mechanism.

3. The auxiliary device for density testing of asphalt core samples according to claim 2, characterized in that, The control arm includes a mounting tube, a horn cover, a first connecting tube, a second connecting tube, a third connecting tube, and a rocker arm. The mounting tube, the first connecting tube, the second connecting tube, the third connecting tube, and the rocker arm are connected in sequence. The second connecting tube is rotatably inserted into the side wall of the molten wax pool. The horn cover is installed at the end of the mounting tube away from the first connecting tube. The mounting tube is located inside the molten wax pool, and the rocker arm is located outside the molten wax pool. The rocker arm, the third connecting tube, and the second connecting tube form a Z-shaped hand crank structure. The mounting tube, the first connecting tube, and the second connecting tube form a Z-shaped crank structure. The horn cover makes the end of the mounting tube flared. The other end of the connecting rod is inserted into the mounting tube from the horn cover.

4. The auxiliary device for density testing of asphalt core samples according to claim 3, characterized in that, The control mechanism includes a control component and a wire hole. One end of the control component is hinged to the rocker arm. The control component is provided with a connecting part. A traction wire is provided inside the mounting tube and the rocker arm. One end of the traction wire is connected to the connecting rod, and the other end passes through the wire hole and is connected to the connecting part.

5. The auxiliary device for density testing of asphalt core samples according to claim 3, characterized in that, A second elastic element is provided between the connecting rod and the inner wall of the mounting tube. One end of the second elastic element is connected to the connecting rod, and the other end is connected to the inner wall of the mounting tube.

6. The auxiliary device for density testing of asphalt core samples according to claim 1, characterized in that, It also includes a heater, which is laid at the bottom of the molten wax pool and fixedly connected to the molten wax pool. The heater is used to heat solid wax blocks.

7. The auxiliary device for density testing of asphalt core samples according to claim 1, characterized in that, The outer wall of the molten wax pool is provided with a heat insulation component, which is closely attached to the outer wall of the molten wax pool and covers the outside of the molten wax pool.

8. The auxiliary device for density testing of asphalt core samples according to claim 1, characterized in that, The side wall of the wax melting pool is also provided with a wax discharge gate, which is used to allow the remaining wax liquid to flow out after the test is completed.

9. The auxiliary device for density testing of asphalt core samples according to claim 8, characterized in that, The wax discharge gate is mounted on one side of the side wall of the wax melting pool via a rotating shaft, and a controller is provided on the other side. The controller is used to control the opening and closing of the wax discharge gate.

10. The auxiliary device for density testing of asphalt core samples according to claim 6, characterized in that, The side wall of the wax melting pool is also equipped with a switch, which is used to control the heater to turn on and off.

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