Asphalt ductility testing device for highway construction

Abstract

The present invention provides an asphalt ductility detection device for highway construction, comprising a support plate, a bathtub being provided on the top of the support plate, a fixed pull frame and a movable pull frame being provided on the support plate, the middle parts of the fixed pull frame and the movable pull frame extending into the interior of the bathtub, a stretching drive mechanism being provided on the support plate for driving the movable pull frame away from or close to the fixed pull frame, a convex lens assembly being centrally provided between the fixed pull frame and the movable pull frame, the convex lens assembly being transmission-connected to the movable pull frame via a lens linkage mechanism; in the present invention, the two ends of a manufactured test mold are respectively mounted on the tops of the movable pull frame and the fixed pull frame, the stretching drive mechanism drives the movable pull frame to move to stretch the asphalt sample in the test mold, and during the movement of the movable pull frame, the convex lens assembly is driven to move via the lens linkage mechanism, so that the convex lens assembly and the middle part of the stretched sample maintain a corresponding state, so as to facilitate the amplification of asphalt drawing and timely detection of changes such as breakage, bending or sagging of the asphalt drawing.

Description

Technical Field

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

[0002] During the asphalt ductility test, it is necessary to pay attention to the changes in the morphology of the asphalt filaments throughout the process. When the asphalt filaments suddenly lose continuity or the originally straightened asphalt filaments suddenly bend or sag locally, it indicates that the sample has broken. The test should be stopped immediately and the tensile length should be recorded.

[0003] Currently, operators rely on visual observation of changes in the asphalt sample's state during stretching to determine when fracture has occurred. However, the diameter of the drawn asphalt wire is small, especially in the middle, which is a prone location for fracture. The subtle changes in asphalt wire fracture, bending, or sagging can easily lead to misjudgment and significant errors when directly observing with the naked eye.

[0004] In the prior art, the Chinese utility model patent document with authorization announcement number CN203705278U discloses an elongation measuring instrument device with a prism observation set on one side. The device magnifies the asphalt drawing by setting a prism on the side of the observation area to improve the accuracy of observation. However, the prism is set on the side, and it is inconvenient to bend down and look up to observe. In addition, the purpose of the prism is refraction, which causes the position of the object to change or produces dispersion, and it does not have a magnifying effect.

[0005] Furthermore, the Chinese utility model patent document with authorization publication number CN212180499U discloses an asphalt ductility tester; the Chinese utility model patent document with authorization publication number CN212722428U discloses an asphalt elongation detection device; and the Chinese utility model patent document with authorization publication number CN208223986U discloses a constant temperature digital display asphalt elongation meter; in the above-mentioned prior art, it is necessary to manually slide the lens frame to observe the asphalt drawing 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 as the stretching proceeds, so that the convex lens remains corresponding to the middle of the asphalt sample drawing, facilitates observation, and improves operational convenience to solve the current technical problems. Summary of the Invention

[0007] In response to the shortcomings of the existing technology, the present invention provides an asphalt ductility detection device for highway construction that can automatically adjust the position of a convex lens as the stretching is carried out, so that the convex lens remains corresponding to the middle part of the asphalt sample drawing, facilitates observation, and improves operational 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 provided on the top of the support plate, a fixed pull frame and a movable pull frame are provided 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 provided on the support plate for driving the movable pull frame away from or close to the fixed pull frame, a convex lens assembly is centrally arranged between the fixed pull frame and the movable pull frame, 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 engaged 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, and 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, the 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 has 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, and a connecting strip is fixedly provided at one end of the lens support frame; the object distance adjustment mechanism has 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 rack and the movable pull rack both have a pull rack horizontal plate extending into the interior of the bath, the two pull rack horizontal plates are correspondingly provided with test mold pillars, and the tops of the two pull rack horizontal plates are symmetrically provided with test mold stopping mechanisms.

[0013] Furthermore, the test mold stopping mechanism has a stopping sliding seat symmetrically arranged on the top of the two ends of the pull frame cross plate, the inside of the stopping sliding seat is provided with a stopping sliding rod for sliding, one end of the stopping sliding rod is fixedly provided with a stop block, the other end of the stopping sliding rod is fixedly provided with a stopping support bar, the stopping support bar is provided with a stopping fork matching the upper end of the test mold support, and a return spring is sleeved on the outer side of the stopping sliding rod between the stopping sliding seat and the stop block.

[0014] Furthermore, 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.

[0015] Furthermore, a bathtub guide cover is slidably sleeved on the outer side of the bathtub, and the top of the bathtub guide cover is fixedly connected to the support plate; hanging seats are evenly arranged inside the bathtub, and a hanging wire is fixedly arranged on the top of the hanging seat, and a hanging plate corresponding to the hanging wire is fixedly arranged on the inner top of the bathtub guide cover, and the hanging wire passes through the hanging plate, and at least one adjusting nut is assembled on the outer side of the hanging wire above the hanging plate.

[0016] Furthermore, a support column slider is fixedly provided at the bottom end of the support column, a support column slide rod is slidably sleeved inside the support column slider, and both ends of the support column slide rod are fixedly mounted on the bottom of the support plate.

[0017] Furthermore, the stretching drive mechanism has a screw that is arranged on the top of the support plate and rotates parallel to the long side of the top surface of the bathtub, and a driving motor is provided at one end of the screw to drive it to rotate. A driving block is threadedly connected to the screw, and two driving guide rods are symmetrically slidably arranged on the driving block. The two ends of the driving guide rods are fixedly mounted on the top of the support plate; one end of the dynamic pulling frame is fixedly connected to the driving block.

[0018] Beneficial effects of the present invention:

[0019] (1) In the present invention, the two ends of the prepared test mold are respectively installed on the top of the movable stretching frame and the fixed stretching frame. The stretching drive mechanism drives the movable stretching frame to move to stretch the asphalt sample in the test mold. During the movement of the movable stretching frame, the convex lens assembly is driven to move by the lens linkage mechanism, so that the convex lens assembly and the middle part of the stretched sample are kept in a corresponding state, so as to magnify the asphalt drawing and timely detect changes such as breakage, bending or sagging of the asphalt drawing;

[0020] (2) When the movable pulling frame is driven to move by the stretching drive mechanism, the movable pulling frame drives the movable rack to move, and when the movable rack moves, it drives the gear to move on the fixed rack. The gear movement distance is half of the moving rack movement distance, so that the convex lens assembly installed at the end of the support column above the movable rack remains in a state corresponding to the middle of the sample. As the stretching proceeds, the position of the convex lens assembly is automatically adjusted so that the convex lens assembly remains in correspondence with the middle of the asphalt sample drawing, which facilitates observation and improves the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the asphalt ductility detection device used in highway construction in the present invention.

[0022] Figure 2 This is one of the partial structural schematic diagrams of the asphalt ductility detection device used in highway construction in the present invention.

[0023] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0024] Figure 4 for Figure 3 A partial enlarged view of point B in the middle.

[0025] Figure 5 This is the second partial structural diagram of the asphalt ductility detection device used in highway construction in the present invention.

[0026] Figure 6 for Figure 5 A partial enlarged view of point C in the middle.

[0027] Figure 7 for Figure 5 A partial enlarged view of point D in the middle.

[0028] Figure 8 for Figure 5 A partial enlarged view of point E in the middle.

[0029] Figure 9 This is the third partial structural diagram of the asphalt ductility detection device used in highway construction in the present invention. DETAILED DESCRIPTION

[0030] 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 is in no way intended to limit the present invention, 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 arrangement of components and steps, the composition of materials, numerical expressions, and numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0031] The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are simply used to distinguish different parts. Terms such as "include" or "comprising" mean that the elements preceding the term include the elements listed after the term, and do not exclude the possibility of also including other elements. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0032] like Figures 1 to 3As shown, an asphalt ductility detection device for highway construction includes a support plate 12, a bathtub 2 is provided on the top of the support plate 12, a fixed pull frame 5 and a movable pull frame 4 are provided on the support plate 12, the middle parts of the fixed pull frame 5 and the movable pull frame 4 extend into the interior of the bathtub 2, a stretching drive mechanism 3 is provided 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 provided in the center 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; The linkage mechanism 7 has a support column 74, the bottom end of the support column 74 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 engaged with a parallel movable rack 72 and a fixed rack 71. The movable 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 movable rack 72 is fixedly connected to the movable pull frame 4, and the convex lens assembly 6 is connected to the upper end of the support column 74; in this embodiment In the process, 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 maintains a corresponding state with the middle part of the stretched sample, so as to magnify the asphalt drawing and timely detect 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 maintains 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 maintains a corresponding state with the middle part of the asphalt sample drawing, which is convenient for observation and improves the convenience of operation.

[0033] In the above embodiment, a rack slot 73 is fixedly provided on the support plate 12, and the movable rack 72 is slidably provided inside the rack slot 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.

[0034] In some embodiments, a cabinet 1 is provided at the bottom of the pallet 12 to provide support for the pallet 12. In addition, an operating table 11 is 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 that cooperates with the scale 14 is provided at the end of the movable pull frame 4.

[0035] In some embodiments, a support platform 76 is fixedly provided in the middle of the support column 74, and a support arm 78 is rotatably mounted on the support column 74 above the support platform 76, and a limit plate 77 is fixedly provided on the top 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, and one end of the support arm 78 is rotatably mounted on the outside of the support column 74. The support arm 78 can rotate around the support column 74, so that the convex lens assembly 6 can be rotated and adjusted. When installing the test mold on the top of the movable pull frame 4 and the fixed pull frame 5, the convex lens assembly 6 can be rotated to avoid it first. After the test mold is installed, the convex lens assembly 6 can be rotated and reset to avoid the convex lens assembly 6 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.

[0036] In some embodiments, as Figure 2 、 3 As shown in Figure 4, a positioning block 761 is fixedly provided on the top of the support platform 76, and the positioning block 761 is connected to the outer side of the support column 74 to form an integrated structure. A first notch 781 and a second notch 782 that match the positioning block 761 are provided on the support arm 78; when the first notch 781 is mounted on the outer side of the positioning block 761, the support arm 78 is parallel to the long side of the top surface of the bathtub 2, and the test mold can be installed on the top of the movable pull frame 4 and the fixed pull frame 5; when the second notch 782 is mounted on the outer side of the positioning block 761, the support arm 78 is parallel to the short side of the top surface of the bathtub 2, and the sample can be observed through the convex lens assembly 6; the support arm 78 cooperates 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 positions.

[0037] In some embodiments, as Figure 3As shown, the end of the support arm 78 away from the support column 74 is connected to the convex lens assembly 6 through the object distance adjustment mechanism 8; the convex lens assembly 6 has a lens support frame 61, a lens frame plate 63 is fixedly provided inside the lens support frame 61, a convex lens 62 is provided inside the lens frame plate 63, and a connecting strip 64 is fixedly provided at one end of the lens support frame 61; the object distance adjustment mechanism 8 has an object distance adjustment screw 81 arranged in the vertical direction and threadedly connected to the support arm 78, and an object distance adjustment guide rod 82 parallel to the object distance adjustment screw 81 is slidably provided on the support arm 78; the bottom end of the object distance adjustment screw 81 rotates with the connecting strip 64 The bottom end of the object distance adjustment guide rod 82 is fixedly connected to the connecting strip 64; in this embodiment, the distance between the convex lens assembly 6 and the asphalt sample can be adjusted by the object distance adjustment mechanism 8 to obtain a clear and suitable magnified image of the asphalt sample wire drawing; specifically, the object distance adjustment screw 81 is rotated, and the threaded structure between the object distance adjustment screw 81 and the support arm 78 can drive the object distance adjustment screw 81 to drive the convex lens assembly 6 to move up and down, thereby adjusting the distance between the convex lens assembly 6 and the asphalt sample; the lens frame plate 63 is provided with a mounting ring groove matching the convex lens 62, and the convex lens 62 is clamped inside the mounting ring groove.

[0038] In some embodiments, as Figure 5 and 7 As shown, the fixed stretching frame 5 and the movable stretching frame 4 both have a stretching frame horizontal plate 51 extending into the interior of the bath 2, and the two stretching frame horizontal plates 51 are correspondingly provided with test mold pillars 52, and the tops of the two stretching frame horizontal plates 51 are symmetrically provided with test mold stopping mechanisms 9; the test mold pillars 52 are used to fix the test mold; the test mold stopping mechanism 9 is used to stop and limit the top of the test mold mounted on the test mold pillars 52 to prevent the test mold from falling off the test mold pillars 52 during the stretching process, thereby affecting the test.

[0039] As a specific embodiment of the test mold stopping mechanism 9, the test mold stopping mechanism 9 has a stopping slide seat 94 symmetrically arranged on the top of the two ends of the pull frame cross plate 51, and the internal sliding of the stopping slide seat 94 is provided with a stopping rod 93, one end of the stopping slide rod 93 is fixedly provided with a stop block 96, and the other end of the stopping slide rod 93 is fixedly provided with a stopping support bar 92, and the stopping support bar 92 is provided with a stopping fork 91 that matches the upper end of the test mold support 52, and a reset spring 95 is sleeved on the outer side of the stopping slide seat 94 and the stop block 96; when the asphalt sample is not stretched In the initial state, the blocks 96 of the two test mold stopping mechanisms 9 are in contact with each other, the reset spring 95 is compressed, and the distance between the stopping fork 91 and the test mold pillar 52 is enough for the test mold to be installed on the test mold pillar 52. After the test mold is installed, the movable pull frame 4 starts to move to stretch the asphalt test in the test mold, and the movable pull frame 4 gradually moves away from the fixed pull frame 5, the reset spring 95 is gradually released, and the stopping fork 91 gradually moves to the upper end of the test mold pillar 52, and stops and limits the test mold set on the test mold pillar 52 to prevent the test mold from falling off the test mold pillar 52 during the stretching process.

[0040] 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 pillar 52, and a guide slope 911 is provided at the bottom of both ends of the stopping fork 91; if the test mold is not installed on the test mold pillar 52 to abut against the pull frame cross plate 51, as the stopping fork 91 moves, the guide slope 911 pushes the top of the test mold and presses the test mold down into place. Then, as the stopping fork 91 continues to move, the stopping fork 91 gradually moves to the upper end of the test mold pillar 52, thereby stopping and limiting the test mold installed on the test mold pillar 52.

[0041] In some embodiments, as Figure 5 and 8As shown, the outer side of the bathtub 2 is slidably sleeved with a bathtub guide cover 13, and the top of the bathtub guide cover 13 is fixedly connected to the support plate 12; the interior of the bathtub 2 is evenly provided with hangers 21, and the top of the hangers 21 is fixedly provided with a hanging wire 22, and the inner top of the bathtub guide cover 13 is fixedly provided with a hanging plate 23 corresponding to the hanging wire 22, and the hanging wire 22 passes through the hanging plate 23. At least one adjusting nut 24 is assembled on the outer side of the hanging wire 22 above the hanging plate 23; before the test, water or other liquid needs to be added to the inside of the bathtub 2, and alcohol, salt, etc. need to be added to adjust its density so that the density of the liquid inside the water tank is consistent with the density of the asphalt test The degree is close, and when the test mold is placed in the liquid inside the bath 2, the distance between the top of the test mold and the top surface of the liquid in the bath 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 top surface of the liquid in the bath 2 does not meet the requirement after the test mold is placed in the liquid inside the bath 2, it is necessary to add water again and adjust the density, which is relatively cumbersome; however, through the technical solution in this embodiment, the position of the adjusting nut 24 on the rotating hanging wire 22 can be moved up and down to adjust the position of the bath 2, so that the distance between the top of the test mold and the top surface of the liquid in the bath 2 meets the test requirements, thereby improving convenience.

[0042] In some embodiments, as a specific embodiment of the sliding connection between the support column 74 and the support plate 12, as shown in FIG. Figure 9 As shown, a support column slider 741 is fixedly provided at the bottom end of the support column 74, and a support column slide rod 742 is slidingly sleeved inside the support column slider 741. The support column slide rod 742 is parallel to the long side of the top surface of the bathtub 2, and both ends of the support column slide rod 742 are fixedly mounted on the bottom of the support plate 12.

[0043] In some embodiments, as Figure 5 and 6 As shown, the stretching drive mechanism 3 has a lead screw 31 which is arranged on the top of the support plate 12 and rotates parallel to the long side of the top surface of the bath 2. A driving motor 34 is provided at one end of the lead screw 31 to drive it to rotate. A driving block 32 is threadedly connected to the lead screw 31. Two driving guide rods 33 are symmetrically slidably provided on the driving block 32. Both ends of the driving guide rods 33 are fixedly mounted on the top of the support plate 12; one end of the movable stretching 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 rod 33, and the driving block 32 drives the movable stretching frame 4 to move to stretch the asphalt sample; the movable stretching frame 4 is fixedly connected to one end of the movable rack 72 through the connecting arm 35.

[0044] In some embodiments, two pipe joints 25 are symmetrically provided at the bottom of the bathtub 2. The pipe joints 25 are connected to an external water temperature regulating device through a pipeline to regulate the water temperature in the bathtub 2; the external water temperature regulating device includes a water chiller and a water heater.

[0045] In order to further facilitate the observation of the asphalt drawing inside the bath 2, the inner bottom of the bath 2 can be set to white.

[0046] Thus far, various embodiments of the present invention have been described in detail. To avoid obscuring the concept of the present invention, some details well known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0047] The above-described embodiments represent only some embodiments of the present invention. Although the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the scope of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be based on the appended claims.

Claims

1. An asphalt ductility detection device for highway construction, characterized by: The invention comprises a support plate, a bathtub is provided on the top of the support plate, a fixed pull frame and a movable pull frame are provided 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 provided on the support plate for driving the movable pull frame away from or close to the fixed pull frame, a convex lens assembly is centrally provided 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 a support plate along the long side 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 engaged on both sides of the gear. The movable rack is slidably mounted 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; The fixed pull frame and the movable pull frame both have a pull frame horizontal plate extending into the bath, the two pull frame horizontal plates are correspondingly provided with test mold pillars, and the tops of the two pull frame horizontal plates are symmetrically provided with test mold stopping mechanisms; The test mold stopping mechanism has a stopping slide seat symmetrically arranged on the top of the two ends of the pull frame cross plate, the inside of the stopping slide seat is provided with a stopping slide rod, one end of the stopping slide rod is fixedly provided with a stop block, the other end of the stopping slide rod is fixedly provided with a stopping support bar, the stopping support bar is provided with a stopping fork matching the upper end of the test mold support, and a reset spring is sleeved on the outside of the stopping slide rod between the stopping slide seat and the stop block.

2. The asphalt ductility detection device for highway 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 sleeved 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 provided on the top of the support platform, and a first notch and a second notch matching the positioning block are provided 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 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, 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 arranged on the support arm; The bottom end of the object distance adjusting screw rod is rotatably connected to the connecting strip, and the bottom end of the object distance adjusting 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 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.

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

7. 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, the inner sliding sleeve of the support column slider is provided with a support column slide rod, and the two ends of the support column slide rod are fixedly mounted on the bottom of the support plate.

8. The asphalt ductility detection device for highway construction according to claim 1, characterized in that: The stretching drive mechanism comprises a lead screw which is arranged on the top of the support plate and rotates parallel to the long side of the top surface of the bathtub. A drive motor is provided at one end of the lead screw to drive the lead screw to rotate. A drive block is threadedly connected to the lead screw. Two drive guide rods are symmetrically slidably provided on the drive block. Both ends of the drive guide rods are fixedly mounted on the top of the support plate. One end of the movable pull frame is fixedly connected to the driving block.

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