Asphalt extensibility detection device for highway construction

Abstract

The invention provides an asphalt extensibility detection device for highway construction, which comprises a supporting plate, the top of the supporting plate is provided with a bath, the supporting plate is provided with a fixed pulling frame and a movable pulling frame, the middle parts of the fixed pulling frame and the movable pulling frame extend into the bath, and the supporting plate is provided with a stretching driving mechanism for driving the movable pulling frame to be far away from or close to the fixed pulling frame. A convex lens assembly is arranged in the middle between the fixed pull frame and the movable pull frame and is in transmission connection with the movable pull frame through a lens linkage mechanism; according to the device, the two ends of a manufactured test mold are installed on the top of the movable pulling frame and the top of the fixed pulling frame respectively, the stretching driving mechanism drives the movable pulling frame to move to stretch an asphalt sample in the test mold, and in the moving process of the movable pulling frame, the lens linkage mechanism drives the convex lens assembly to move; the convex lens assembly and the middle part of the stretched sample are kept in a corresponding state, so that the asphalt drawn wire is amplified, and changes such as fracture, bending or drooping of the asphalt drawn wire can be found in time.

Description

Technical Field

[0001] The present invention belongs to the technical field of ductility detection, and particularly relates to an asphalt ductility detection device for highway construction. Background Art

[0002] During the asphalt ductility test, it is necessary to pay full attention to the morphological changes of the asphalt filament throughout the process. When the asphalt filament suddenly loses continuity or the originally straightened asphalt filament suddenly shows local bending or sagging, it indicates that the specimen has fractured, and the test should be stopped immediately and the tensile length should be recorded.

[0003] Currently, the operator needs to observe the state changes of the asphalt specimen during stretching with the naked eye to judge the occurrence of fracture. However, the diameter of the asphalt wire is relatively small after drawing, especially in the middle part, and the middle area of the asphalt wire is the position where fracture is likely to occur. The changes in fracture, bending or sagging of the asphalt wire are subtle, and it is easy to misjudge and cause large errors by direct observation with the naked eye.

[0004] In the prior art, the Chinese utility model patent document with the authorization publication number CN203705278U discloses an extensometer device with a prism observation set on one side. It magnifies the asphalt wire by setting a triangular prism on the side of the observation area to improve the accuracy of observation. However, the triangular prism is set on the side, and it is necessary to bend down and look up to observe, which is rather inconvenient. Moreover, the function of the triangular prism is refraction, which causes the change of the object position or dispersion, rather than having a magnifying effect.

[0005] Furthermore, the Chinese utility model patent document with the authorization publication number CN212180499U discloses an asphalt ductility tester; the Chinese utility model patent document with the authorization publication number CN212722428U discloses an asphalt ductility detection device; and the Chinese utility model patent document with the authorization publication number CN208223986U discloses a constant temperature digital display asphalt ductility meter. In the above prior art, it is necessary to manually slide the lens holder to observe the asphalt wire during stretching, and the operation convenience is poor.

[0006] Therefore, it is necessary to design an asphalt ductility detection device for highway construction that can automatically adjust the position of the convex lens during stretching, keep the convex lens corresponding to the middle part of the asphalt specimen wire, facilitate observation, and improve the operation convenience to solve the current technical problems. Summary of the Invention

[0007] Aiming at the deficiencies in the prior art, the present invention provides an asphalt ductility detection device for highway construction that can automatically adjust the position of the convex lens during stretching, keep the convex lens corresponding to the middle part of the asphalt specimen wire, facilitate observation, and improve the operation convenience.

[0008] The technical solution of the present invention is: an asphalt ductility detection device for highway construction, comprising a support plate, a bathtub is arranged on the top of the support plate, a fixed pull frame and a movable pull frame are arranged on the support plate, the middle parts of the fixed pull frame and the movable pull frame extend into the interior of the bathtub, a stretching drive mechanism is arranged on the support plate to drive the movable pull frame away from or close to the fixed pull frame, a convex lens assembly is arranged in the center between the fixed pull frame and the movable pull frame, and the convex lens assembly is transmission-connected to the movable pull frame through a lens linkage mechanism; the lens linkage mechanism has a support column, the bottom end of the support column is slidingly connected to the support plate along the long side direction of the top surface of the bathtub, a gear is rotatably mounted on the support column, and parallel movable racks and fixed racks are respectively meshed on both sides of the gear, and the movable rack is slidably arranged on the top of the support plate; one end of the movable rack is fixedly connected to the movable pull frame, and the convex lens assembly is connected to the upper end of the support column.

[0009] Furthermore, a support platform is fixedly provided in the middle of the support column, a support arm is rotatably mounted on the support column above the support platform, a limiting plate is fixedly provided on the top of the support column; one end of the convex lens assembly is connected to the support arm.

[0010] Furthermore, a positioning block is fixedly provided on the top of the support platform, and a first slot and a second slot matching the positioning block are provided on the support arm; when the first slot is mounted on the outside of the positioning block, the support arm is parallel to the long side of the top surface of the bathtub; when the second slot is mounted on the outside of the positioning block, the support arm is parallel to the short side of the top surface of the bathtub.

[0011] Furthermore, one end of the support arm facing away from the support column is connected to the convex lens assembly through an object distance adjustment mechanism; the convex lens assembly comprises a lens support frame, a lens frame plate is fixedly provided inside the lens support frame, a convex lens is provided inside the lens frame plate, and a connecting strip is fixedly provided at one end of the lens support frame; the object distance adjustment mechanism comprises an object distance adjustment screw arranged in a vertical direction and threadedly connected to the support arm, and an object distance adjustment guide rod parallel to the object distance adjustment screw is slidably provided on the support arm; the bottom end of the object distance adjustment screw is rotatably connected to the connecting strip, and the bottom end of the object distance adjustment guide rod is fixedly connected to the connecting strip.

[0012] Furthermore, the fixed pull frame and the movable pull frame both have a pull frame transverse plate extending into the bath, the two pull frame transverse plates are correspondingly provided with test mold pillars, and the tops of the two pull frame transverse plates are symmetrically provided with test mold stopping mechanisms.

[0013] Furthermore, the test die stopping mechanism has stopping sliding seats symmetrically arranged at the tops of both ends of the cross plate of the pulling frame. A stopping sliding rod is slidably arranged inside the stopping sliding seat. One end of the stopping sliding rod is fixedly provided with a blocking block, and the other end of the stopping sliding rod is fixedly provided with a stopping support bar. A stopping fork matching the upper end of the test die support column is arranged on the stopping support bar. A return spring is sleeved outside the stopping sliding rod between the stopping sliding seat and the blocking block.

[0014] Furthermore, the stopping fork is a U-shaped structure with an inner part matching the outer side of the upper end of the test die support column. Guide inclined surfaces are arranged at the bottoms of both ends of the stopping fork.

[0015] Furthermore, a bathtub guide cover is slidably sleeved outside the bathtub. The top end of the bathtub guide cover is fixedly connected to the support plate. Suspension seats are evenly arranged inside the bathtub. A suspension wire is fixedly arranged at the top of the suspension seat. A suspension plate corresponding to the suspension wire is fixedly arranged at the inner top of the bathtub guide cover. The suspension wire penetrates through the suspension plate, and at least one adjusting nut is assembled outside the suspension wire above the suspension plate.

[0016] Furthermore, a support column slider is fixedly arranged at the bottom end of the support column. A support column sliding rod is slidably sleeved inside the support column slider. Both ends of the support column sliding rod are fixedly mounted at the bottom of the support plate.

[0017] Furthermore, the stretching driving mechanism has a lead screw rotatably arranged on the top of the support plate parallel to the long side of the top surface of the bathtub. One end of the lead screw is provided with a driving motor for driving its rotation. A driving block is threadedly connected to the lead screw. Two driving guide rods are symmetrically and slidably arranged on the driving block. Both ends of the driving guide rod are fixedly mounted on the top of the support plate. One end of the movable pulling frame is fixedly connected to the driving block.

[0018] Advantages of the present invention: (1) In the present invention, both ends of the fabricated test die are respectively installed on the tops of the movable pulling frame and the fixed pulling frame. The stretching driving mechanism drives the movable pulling frame to move to stretch the asphalt sample in the test die. During the movement of the movable pulling frame, the convex lens assembly is driven to move through the lens linkage mechanism, so that the convex lens assembly keeps a corresponding state with the middle part of the stretched sample, facilitating the magnification of the asphalt wire drawing and enabling timely detection of changes such as fracture, bending or sagging of the asphalt wire drawing. (2)When the movable carriage is driven to move by the stretching drive mechanism, the movable carriage drives the movable rack to move. When the movable rack moves, it drives the gear to move on the fixed rack. The moving distance of the gear is half of the moving distance of the movable rack, so that the convex lens assembly at the end of the support column above the movable rack keeps corresponding to the middle part of the specimen. As the stretching progresses, the position of the convex lens assembly is automatically adjusted to keep the convex lens assembly corresponding to the middle part of the asphalt specimen during wire drawing, which is convenient for observation and improves the operation convenience. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the asphalt ductility detection device for highway construction in the present invention.

[0020] Figure 2 It is one of the partial structural schematic diagrams of the asphalt ductility detection device for highway construction in the present invention.

[0021] Figure 3 It is Figure 2 The partial enlarged view at A in

[0022] Figure 4 It is Figure 3 The partial enlarged view at B in

[0023] Figure 5 It is another partial structural schematic diagram of the asphalt ductility detection device for highway construction in the present invention.

[0024] Figure 6 It is Figure 5 The partial enlarged view at C in

[0025] Figure 7 It is Figure 5 The partial enlarged view at D in

[0026] Figure 8 It is Figure 5 The partial enlarged view at E in

[0027] Figure 9 It is the third partial structural schematic diagram of the asphalt ductility detection device for highway construction in the present invention. Detailed Embodiment

[0028] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and in no way limits the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully convey the scope of the present invention to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the compositions of materials, numerical expressions and values set forth in these embodiments should be construed as merely exemplary and not as limitations.

[0029] The terms "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are merely used to distinguish different parts. The terms such as "comprising" or "including" mean that the elements before the term cover the elements listed after the term, and do not exclude the possibility of also covering other elements. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0030] As Figures 1 to 3As shown, an asphalt ductility detection device for highway construction includes a support plate 12, a bath 2 is arranged on the top of the support plate 12, a fixed pull frame 5 and a movable pull frame 4 are arranged on the support plate 12, the middle parts of the fixed pull frame 5 and the movable pull frame 4 extend to the inside of the bath 2, a stretching drive mechanism 3 is arranged on the support plate 12 to drive the movable pull frame 4 away from or close to the fixed pull frame 5, a convex lens assembly 6 is arranged in the middle between the fixed pull frame 5 and the movable pull frame 4, and the convex lens assembly 6 is connected to the movable pull frame 4 through a lens linkage mechanism 7; lens The linkage mechanism 7 has a support column 74, the bottom end of which is slidably connected to the support plate 12 along the long side direction of the top surface of the bathtub 2, and a gear 75 is rotatably mounted on the support column 74. The two sides of the gear 75 are respectively meshed with parallel moving racks 72 and fixed racks 71. The moving rack 72 is slidably arranged on the top of the support plate 12, and the fixed rack 71 is fixedly arranged on the top of the support plate 12; one end of the moving rack 72 is fixedly connected to the moving bracket 4, and the convex lens assembly 6 is connected to the upper end of the support column 74; in this embodiment In the present invention, the two ends of the prepared test mold are respectively installed on the top of the movable pulling frame 4 and the fixed pulling frame 5. The stretching drive mechanism 3 drives the movable pulling frame 4 to move to stretch the asphalt sample in the test mold. During the movement of the movable pulling frame 4, the convex lens assembly 6 is driven to move by the lens linkage mechanism 7, so that the convex lens assembly 6 and the middle part of the stretched sample are kept in a corresponding state, so as to magnify the asphalt drawing and timely discover the changes such as breakage, bending or sagging of the asphalt drawing; when the movable pulling frame 4 is driven to move by the stretching drive mechanism 3, the movable pulling frame 4 drives the movable rack 72 to move, and when the movable rack 72 moves, it drives the gear 75 to move on the fixed rack 71, and the moving distance of the gear 75 is half of the moving distance of the movable rack 72, so that the convex lens assembly 6 installed at the end of the support column 74 above the movable rack 72 is kept in a corresponding state with the middle part of the stretched sample. As the stretching proceeds, the position of the convex lens assembly 6 is automatically adjusted, so that the convex lens assembly 6 and the middle part of the asphalt sample drawing are kept corresponding, which is convenient for observation and improves the convenience of operation.

[0031] In the above embodiment, a rack slide groove 73 is fixedly provided on the support plate 12, and the movable rack 72 is slidably provided inside the rack slide groove 73; the fixed rack 71 is parallel to the long side of the top surface of the bathtub 2, and the movable rack 72 is parallel to the fixed rack 71.

[0032] In some embodiments, a cabinet 1 is provided at the bottom of the pallet 12, and the cabinet 1 provides support for the pallet 12. In addition, an operating table 11 is also provided on the pallet 12. The operating table 11 is a conventional setting in the prior art and will not be described in detail. A scale 14 is provided on the pallet 12 corresponding to the bathtub 2, and a pointer matching the scale 14 is provided at the end of the movable pull frame 4.

[0033] In some embodiments, a support platform 76 is fixedly arranged in the middle of the support column 74. A support arm 78 is rotatably sleeved on the support column 74 above the support platform 76. A limit plate 77 is fixedly arranged at the top end of the support column 74. One end of the convex lens assembly 6 is connected to the support arm 78. The support platform 76 supports the support arm 78. One end of the support arm 78 is rotatably sleeved outside the support column 74. The support arm 78 can rotate around the support column 74, so as to rotate and adjust the convex lens assembly 6. When installing a test mold on the tops of the moving pull frame 4 and the fixed pull frame 5, the convex lens assembly 6 can be rotated out of the way first. After the test mold is installed, the convex lens assembly 6 is rotated back to its original position, so as to prevent the convex lens assembly 6 from affecting the installation of the test mold. In addition, the limit plate 77 is used to prevent the support arm 78 from slipping off the support column 74.

[0034] In some embodiments, such as Figure 2 , 3 As shown in and 4, a positioning block 761 is fixedly arranged at the top of the support platform 76. The positioning block 761 and the outer side of the support column 74 are integrally connected. A first notch 781 and a second notch 782 matching the positioning block 761 are formed on the support arm 78. When the first notch 781 is sleeved outside the positioning block 761, the support arm 78 is parallel to the long side of the top surface of the bath 2. At this time, a test mold can be installed on the tops of the moving pull frame 4 and the fixed pull frame 5. When the second notch 782 is sleeved outside the positioning block 761, the support arm 78 is parallel to the short side of the top surface of the bath 2. At this time, the specimen can be observed through the convex lens assembly 6. The support arm 78 is matched with the positioning block 761 through the first notch 781 and the second notch 782 to realize the positioning of the support arm 78 in two position states.

[0035] In some embodiments, such as Figure 3As shown, one end of the support arm 78 away from the support column 74 is connected to the convex lens assembly 6 through the object distance adjusting mechanism 8; the convex lens assembly 6 has a lens support frame 61, a lens support plate 63 is fixedly arranged inside the lens support frame 61, a convex lens 62 is arranged inside the lens support plate 63, and a connecting plate strip 64 is fixedly arranged at one end of the lens support frame 61; the object distance adjusting mechanism 8 has an object distance adjusting screw 81 arranged in the vertical direction and threadedly connected to the support arm 78, and an object distance adjusting guide rod 82 parallel to the object distance adjusting screw 81 is slidably arranged on the support arm 78; the bottom end of the object distance adjusting screw 81 is rotatably connected to the connecting plate strip 64, and the bottom end of the object distance adjusting guide rod 82 is fixedly connected to the connecting plate strip 64; in this embodiment, the distance between the convex lens assembly 6 and the asphalt sample can be adjusted through the object distance adjusting mechanism 8 to obtain a clear and suitable enlarged image of the asphalt sample drawing for observation; specifically, by rotating the object distance adjusting screw 81, the threaded structure between the object distance adjusting screw 81 and the support arm 78 can drive the object distance adjusting screw 81 to drive the convex lens assembly 6 to move up and down to adjust the distance between the convex lens assembly 6 and the asphalt sample; the lens support plate 63 is provided with an installation ring groove matching the convex lens 62, and the convex lens 62 is clamped inside the installation ring groove.

[0036] In some embodiments, as Figure 5 and 7 shown, both the fixed tension frame 5 and the moving tension frame 4 have tension frame cross plates 51 extending into the inside of the bath 2, test mold support columns 52 are correspondingly arranged on the two tension frame cross plates 51, and test mold stop mechanisms 9 are symmetrically arranged on the tops of the two tension frame cross plates 51; the test mold support columns 52 are used to fix the test mold; the test mold stop mechanisms 9 are used to stop and limit the top of the test mold sleeved on the test mold support columns 52 to prevent the test mold from coming off the test mold support columns 52 during the stretching process, which may affect the test progress.

[0037] As a specific embodiment of the test mold stopping mechanism 9, the test mold stopping mechanism 9 has stopping sliders 94 symmetrically arranged at the tops of both ends of the pulling frame cross plate 51. A stopping slide bar 93 is slidably arranged inside the stopping slider 94. One end of the stopping slide bar 93 is fixedly provided with a resisting block 96, and the other end of the stopping slide bar 93 is fixedly provided with a stopping support bar 92. A stopping fork 91 matching the upper end of the test mold support column 52 is arranged on the stopping support bar 92. A return spring 95 is sleeved on the outer side of the stopping slide bar 93 between the stopping slider 94 and the resisting block 96; in the initial state where the asphalt sample is not stretched, the resisting blocks 96 of the two test mold stopping mechanisms 9 are in contact with each other, the return spring 95 is compressed, and the distance between the stopping fork 91 and the test mold support column 52 allows the test mold to be installed on the test mold support column 52. After the test mold is installed, the moving pulling frame 4 starts to move to stretch the asphalt test in the test mold. The moving pulling frame 4 gradually moves away from the fixed pulling frame 5, the return spring 95 is gradually released, and the stopping fork 91 gradually moves to be sleeved on the upper end of the test mold support column 52 to stop and limit the test mold sleeved on the test mold support column 52, so as to prevent the test mold from coming off the test mold support column 52 during the stretching process.

[0038] In some embodiments, the stopping fork 91 is a U-shaped structure whose interior matches the outer side of the upper end of the test mold support column 52. Guide inclined surfaces 911 are arranged at the bottoms of both ends of the stopping fork 91; if the test mold is not installed on the test mold support column 52 until it abuts against the pulling frame cross plate 51, as the stopping fork 91 moves, the guide inclined surface 911 pushes the top of the test mold to press the test mold in place. Then, as the stopping fork 91 continues to move, the stopping fork 91 gradually moves to be sleeved on the upper end of the test mold support column 52 to stop and limit the test mold sleeved on the test mold support column 52.

[0039] In some embodiments, such as Figure 5 and 8As shown in the figure, a bathtub guide cover 13 is slidably sleeved outside the bathtub 2, and the top end of the bathtub guide cover 13 is fixedly connected to the support plate 12; suspension seats 21 are evenly arranged inside the bathtub 2, a suspension wire 22 is fixedly arranged at the top of the suspension seat 21, a suspension plate 23 corresponding to the suspension wire 22 is fixedly arranged at the inner top of the bathtub guide cover 13, the suspension wire 22 penetrates through the suspension plate 23, and at least one adjusting nut 24 is assembled on the outer side of the suspension wire 22 above the suspension plate 23; before the test, liquids such as water need to be added into the bathtub 2, and alcohol, salt, etc. are added to adjust its density so that the density of the liquid inside the water tank is close to the density of the asphalt test. And when the test mold is placed in the liquid inside the bathtub 2, the distance between the top of the test mold and the liquid surface in the bathtub 2 should not be less than 25 mm; currently, if it is found that the distance between the top of the test mold and the liquid surface in the bathtub 2 does not meet the requirements after the test mold is placed in the liquid inside the bathtub 2, it is necessary to add water again and adjust the density, which is rather cumbersome; and through the technical solution in this embodiment, by rotating the position of the adjusting nut 24 on the suspension wire 22, the position of the bathtub 2 can be adjusted up and down, so that the distance between the top of the test mold and the liquid surface in the bathtub 2 meets the test requirements, improving the convenience.

[0040] In some embodiments, as a specific implementation manner of the sliding connection between the support column 74 and the support plate 12, as Figure 9 shown, a support column slider 741 is fixedly arranged at the bottom end of the support column 74, a support column slide bar 742 is slidably sleeved inside the support column slider 741, the support column slide bar 742 is parallel to the long side of the top surface of the bathtub 2, and both ends of the support column slide bar 742 are fixedly mounted on the bottom of the support plate 12.

[0041] In some embodiments, as Figure 5 and 6 shown, the stretching driving mechanism 3 has a lead screw 31 rotatably arranged on the top of the support plate 12 parallel to the long side of the top surface of the bathtub 2. One end of the lead screw 31 is provided with a driving motor 34 for driving its rotation. A driving block 32 is threadedly connected to the lead screw 31. Two driving guide rods 33 are symmetrically slidably arranged on the driving block 32, and both ends of the driving guide rods 33 are fixedly mounted on the top of the support plate 12; one end of the movable pulling frame 4 is fixedly connected to the driving block 32; the driving motor 34 drives the lead screw 31 to rotate, and the threaded structure between the lead screw 31 and the driving block 32 drives the driving block 32 to move along the driving guide rods 33, and the driving block 32 drives the movable pulling frame 4 to move to stretch the asphalt specimen; the movable pulling frame 4 is fixedly connected to one end of the movable rack 72 through a connecting arm 35.

[0042] In some embodiments, two pipe joints 25 are symmetrically arranged at the bottom of the bathtub 2. The pipe joints 25 are connected to an external water temperature regulating device through pipelines to regulate the water temperature in the bathtub 2; the external water temperature regulating device includes a water cooler and a water heater.

[0043] In order to further facilitate the observation of the asphalt wire drawing inside the bathtub 2, the inner bottom of the bathtub 2 can be set to white.

[0044] So far, the embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0045] The above-described embodiments only represent some embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. An asphalt ductility detection device for highway construction, characterized in that: The invention comprises a support plate, a bathtub is arranged on the top of the support plate, a fixed pull frame and a movable pull frame are arranged on the support plate, the middle parts of the fixed pull frame and the movable pull frame extend into the bathtub, a stretching driving mechanism for driving the movable pull frame away from or close to the fixed pull frame is arranged on the support plate, a convex lens assembly is arranged in the middle between the fixed pull frame and the movable pull frame, and the convex lens assembly is connected to the movable pull frame through a lens linkage mechanism; The lens linkage mechanism comprises a support column, the bottom end of which is slidably connected to the support plate along the long side direction of the top surface of the bathtub, a gear is rotatably mounted on the support column, and parallel movable racks and fixed racks are respectively meshed on both sides of the gear, and the movable rack is slidably arranged on the top of the support plate; One end of the movable rack is fixedly connected to the movable pull frame, and the convex lens assembly is connected to the upper end of the support column.

2. The asphalt ductility detection device for road construction according to claim 1, characterized in that: A support platform is fixedly provided in the middle of the support column, a support arm is rotatably mounted on the support column above the support platform, and a limit plate is fixedly provided on the top of the support column; One end of the convex lens assembly is connected to the supporting arm.

3. The asphalt ductility detection device for highway construction according to claim 2, characterized in that: A positioning block is fixedly arranged on the top of the support platform, and a first notch and a second notch matching the positioning block are opened on the support arm; when the first notch is mounted on the outside of the positioning block, the support arm is parallel to the long side of the top surface of the bathtub; when the second notch is mounted on the outside of the positioning block, the support arm is parallel to the short side of the top surface of the bathtub.

4. The asphalt ductility detection device for highway construction according to claim 2, characterized in that: One end of the support arm away from the support column is connected to the convex lens assembly through an object distance adjustment mechanism; The convex lens assembly comprises a lens support frame, a lens frame plate is fixedly arranged inside the lens support frame, a convex lens is arranged inside the lens frame plate, and a connecting strip is fixedly arranged at one end of the lens support frame; The object distance adjustment mechanism comprises an object distance adjustment screw rod which is arranged in the vertical direction and is threadedly connected to the support arm, and an object distance adjustment guide rod which is parallel to the object distance adjustment screw rod is slidably arranged on the support arm; The bottom end of the object distance adjustment screw rod is rotatably connected to the connecting strip, and the bottom end of the object distance adjustment guide rod is fixedly connected to the connecting strip.

5. The asphalt ductility detection device for highway construction according to claim 1, characterized in that: The fixed pull frame and the movable pull frame both have a pull frame transverse plate extending into the interior of the bath, two pull frame transverse plates are correspondingly provided with test mold pillars, and the tops of the two pull frame transverse plates are symmetrically provided with test mold stopping mechanisms.

6. The asphalt ductility detection device for highway construction according to claim 5, characterized in that: The test mold stopping mechanism comprises a stopping slide seat symmetrically arranged at the top of both ends of the pull frame cross plate, a stopping slide rod is slidably arranged inside the stopping slide seat, a stop block is fixedly arranged at one end of the stopping slide rod, a stopping support bar is fixedly arranged at the other end of the stopping slide rod, a stopping fork matching the upper end of the test mold support is arranged on the stopping support bar, and a return spring is sleeved on the outer side of the stopping slide rod between the stopping slide seat and the stop block.

7. The asphalt ductility detection device for highway construction according to claim 6, characterized in that: The stopping fork is a U-shaped structure whose interior matches the outer side of the upper end of the test mold support, and the bottoms of both ends of the stopping fork are provided with guiding inclined surfaces.

8. The asphalt ductility testing device for highway construction according to claim 1, characterized in that: A bathtub guide cover is slidably sleeved on the outer side of the bathtub, and the top end of the bathtub guide cover is fixedly connected to the support plate; The interior of the bathtub is evenly provided with hanging seats, the top of the hanging seats is fixedly provided with hanging wires, the inner top of the bathtub guide cover is fixedly provided with a hanging plate corresponding to the hanging wires, the hanging wires penetrate through the hanging plate, and at least one adjusting nut is assembled on the outer side of the hanging wires above the hanging plate.

9. The asphalt ductility detection device for highway construction according to claim 1, characterized in that: The bottom end of the support column is fixedly provided with a support column slider, and a support column sliding rod is slidably sleeved inside the support column slider, and both ends of the support column sliding rod are fixedly erected on the bottom of the tray.

10. The asphalt ductility detection device for road construction according to claim 1, characterized in that: The stretching drive mechanism has a lead screw rotatably arranged parallel to the long side of the top surface of the bathtub on the top of the tray, one end of the lead screw is provided with a drive motor for driving its rotation, a drive block is threadedly connected to the lead screw, and two drive guide rods are symmetrically slidably arranged on the drive block, and both ends of the drive guide rods are fixedly erected on the top of the tray; One end of the movable pulling frame is fixedly connected to the drive block.

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