A thickness detection device for highway engineering

Abstract

The present invention relates to the field of highway engineering technology, and in particular to a thickness detection device for highway engineering, comprising a base, wherein the four corners of the lower end of the base are respectively provided with lifting legs, a moving part is provided between the lifting legs on the same side, and a detection part is provided on the base; the detection part comprises a bracket fixedly connected to the upper end surface of the base, a driving member 1 is provided on the bracket, a coaxially arranged threaded rod is fixedly connected to the output end of the driving member 1, a moving seat is threadedly connected to the threaded rod, and a sampling mechanism is provided on the moving seat. In the present invention, after the sampling mechanism reaches a sufficient depth, the connection between the root position of the sample core and the external pavement structure is cut off by a cutting assembly, and at the same time, during the upward movement of the sampling mechanism, the cutting assembly still plays a certain supporting role below the sample core to prevent the sample core from falling off, thereby ensuring the integrity of the sample core and further ensuring the accuracy of subsequent detection data.

Description

Technical Field

[0001] The invention relates to the technical field of highway engineering, and in particular to a thickness detection device for highway engineering. Background Art

[0002] At present, in the process of highway construction, in order to ensure the quality and safety of the road, random sampling inspections are usually carried out on a section of road after the construction is completed. The sampling inspection method is to use a road coring machine to drill samples on the road surface and conduct various data inspections on the samples to determine whether the construction of the section of road is qualified.

[0003] In the prior art, when performing pavement thickness detection, a driving motor is mostly used to drive the drill barrel to rotate at high speed, so that the drill barrel drills into the pavement. When the drill barrel drills into the pavement, a part of the pavement structure (hereinafter referred to as the sample core) will enter the drill barrel, and then the drill barrel is moved out from the pavement, and the sample core inside the drill barrel is taken out from the pavement. The staff can measure the height of the sample core to obtain the pavement thickness. However, after the drill barrel drills into the pavement, the root position of the sample core entering therein will be in a connected state with the external pavement structure. Therefore, when the drill barrel is moved out from the pavement, the sample core inside the drill barrel is easily affected by the external pavement structure and then detached from the drill barrel, resulting in the sample core being unable to be smoothly taken out from the pavement, and then the subsequent detection work cannot be completed. Summary of the invention

[0004] The purpose of the present invention is to provide a thickness detection device for highway engineering in order to solve the above-mentioned problem.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A thickness detection device for highway engineering, comprising a base, wherein four corners of the lower end of the base are respectively provided with lifting feet, a moving part is provided between the lifting feet located on the same side, and a detection part is provided on the base;

[0007] The detection part comprises a bracket fixedly connected to the upper end surface of the base, a driving member 1 is provided on the bracket, a threaded rod coaxially arranged is fixedly connected to the output end of the driving member 1, a moving seat is threadedly connected to the threaded rod, and a sampling mechanism is provided on the moving seat;

[0008] The sampling mechanism comprises a support plate fixedly connected to the movable seat, the lower end of the support plate is fixedly connected to an outer cylinder 1, an outer cylinder 2 is sleeved on the outer side of the outer cylinder 1, a driving member 2 is arranged on the support plate, the output end of the driving member 2 extends to the inside of the outer cylinder 1 and is fixedly connected to a coaxially arranged gear, the lower end of the support plate is rotatably connected to an inner cylinder 1, the outer side of the inner cylinder 1 is provided with a tooth groove meshing with the gear, the lower end of the support plate inside the inner cylinder 1 is fixedly connected to an inner cylinder 2, an inner cylinder 3 is arranged inside the inner cylinder 2, a driving member 3 is arranged on the support plate, the output end of the driving member 3 is fixedly connected to the upper end of the inner cylinder 3, a rotating rod is arranged in the inner cylinder 3, a thread groove is provided on the outer circumference of the rotating rod, a block matching with the thread groove is provided on the inner side arm of the inner cylinder 3, the lower end of the rotating rod extends to the inside of the inner cylinder 2 and is fixedly connected with a disc, protrusions are fixedly connected to both sides of the outer circumference of the disc, an annular groove 1, a vertical groove and annular groove 2 matching with the protrusions are provided on the inner side wall of the inner cylinder 2, and a cutting component is arranged inside the disc.

[0009] Preferably, the cutting assembly includes a cavity opened inside the disc, a channel is opened inside the protrusion, the channel is connected to the cavity, a vertical plate is fixedly connected inside the cavity, two telescopic rods are fixedly connected on both sides of the vertical plate, a cutting knife is fixedly connected to one end of the telescopic rod away from the vertical plate, the cutting knife extends to the inside of the channel away from one end of the telescopic rod, two springs are sleeved on the outer side of the two telescopic rods, two ends of the two springs are respectively abutted against the vertical plate and the cutting knife, and a top is fixedly connected to one end of the disc away from the rotating rod.

[0010] Preferably, a fixing seat is fixedly connected to the outer periphery of the outer tube 2, a telescopic rod 1 is fixedly connected to the fixing seat, the upper end of the telescopic rod 1 is fixedly connected to the lower end of the support plate, a spring 1 is sleeved on the outer side of the telescopic rod 1, and the two ends of the spring 1 are respectively fixedly connected to the fixing seat and the support plate.

[0011] Preferably, two vertical grooves are symmetrically arranged about the axis of the inner cylinder 2, the annular groove 1 and the annular groove 2 are arranged parallel to each other, the two ends of the vertical groove are respectively connected to the annular groove 1 and the annular groove 2, and a notch matching the cutting knife is arranged on the inner cylinder 2 at the annular groove 2.

[0012] Preferably, the first driving member and the second driving member are both servo motors, and the third driving member is a cylinder.

[0013] Preferably, the moving part includes a connecting rod 1 hinged with a lifting foot, a connecting rod 2 cooperating with the connecting rod 1 is hinged on another lifting foot located on the same side, and moving wheels are provided on the connecting rod 1 and the connecting rod 2, a rocker arm is rotatably connected to the connecting rod 1, a hook is fixedly connected to the lower end of the rocker arm, a limiting rod 1 cooperating with the hook is fixedly connected to the connecting rod 2, a column 1 is provided at the upper end of the rocker arm, a column 2 is provided on the connecting rod 1, the column 1 and the column 2 are connected by a tension spring, and a limiting rod 2 cooperating with the rocker arm is fixedly connected to the connecting rod 1.

[0014] Preferably, two moving parts are provided, and the two moving parts are respectively located at two sides of the lower end of the base, and the connecting rods on the two moving parts are connected by a synchronization rod.

[0015] Preferably, a sliding rod is provided on the inner side of the bracket, and the sliding rod is slidably connected to the movable seat.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0017] 1. The present application is provided with a sampling mechanism and a cutting assembly. After the sampling mechanism reaches a sufficient depth, the cutting assembly is used to cut off the connection between the root position of the sample core and the external pavement structure. At the same time, during the subsequent upward movement of the sampling mechanism, the cutting assembly still plays a certain supporting role under the sample core to prevent the sample core from falling off, thereby ensuring the integrity of the sample core and further ensuring the accuracy of subsequent detection data.

[0018] 2. The present application is provided with a moving part. When the detection mechanism is sampling, the moving wheels are retracted through the moving part so that the lifting legs are in contact with the ground to form a support, thereby forming a relatively stable platform for the detection work. This avoids the device from being offset due to the large impact force and vibration received by the detection device during drilling sampling, thereby ensuring the stability of the detection work. At the same time, when the detection device needs to be moved, the moving wheels are lowered through the moving part so that the lifting legs are separated from the ground, thereby facilitating the overall movement of the detection device.

[0019] 3. The present application is provided with outer cylinder 1 and outer cylinder 2. When the sampling mechanism is sampling, outer cylinder 2 first contacts the ground. During the continuous descent of the sampling mechanism, outer cylinder 2 always keeps in contact with the ground. At the same time, outer cylinder 1 and outer cylinder 2 slide relative to each other, so that spring 1 is compressed. The elastic force of spring 1 presses outer cylinder 2 firmly on the ground. At the same time, outer cylinder 2 completely covers inner cylinder 1, further ensuring the stability of the sampling mechanism during sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the overall structure of a detection device provided according to an embodiment of the present invention is shown.

[0021] Figure 2 A schematic structural diagram of a moving part provided according to an embodiment of the present invention is shown.

[0022] Figure 3 A schematic structural diagram of a detection unit provided according to an embodiment of the present invention is shown.

[0023] Figure 4 A partial structural cross-sectional view of a sampling mechanism provided according to an embodiment of the present invention is shown.

[0024] Figure 5 A cross-sectional view of the inner structure of the inner cylinder provided according to an embodiment of the present invention is shown.

[0025] Figure 6 It is shown that according to the present invention Figure 5 A magnified view of the structure in the middle.

[0026] Figure 7 It is shown that according to the present invention Figure 5 Enlarged view of the structure at point B in the middle.

[0027] Figure 8 A cross-sectional view of the structure of a cutting assembly provided according to an embodiment of the present invention is shown.

[0028] Legend:

[0029] 1. Base; 2. Lifting foot; 3. Connecting rod 1; 4. Connecting rod 2; 5. Moving wheel; 6. Swing rod; 7. Hook; 8. Limiting rod 1; 9. Column 1; 10. Column 2; 11. Tension spring; 12. Limiting rod 2; 13. Bracket; 14. Threaded rod; 15. Sliding rod; 16. Driving member 1; 17. Moving seat; 18. Support plate; 19. Outer cylinder 1; 20. Outer cylinder 2; 21. Fixed seat; 22. Telescopic rod 1; 23. Spring one; 24, driving member two; 25, gear; 26, inner cylinder one; 27, tooth groove; 28, inner cylinder two; 29, inner cylinder three; 30, driving member three; 31, rotating rod; 32, threaded groove; 33, block; 34, disc; 35, protrusion; 36, annular groove one; 37, vertical groove; 38, annular groove two; 39, cavity; 40, passage; 41, vertical plate; 42, telescopic rod two; 43, spring two; 44, cutting knife; 45, top head. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-8, the present invention provides a technical solution:

[0032] A thickness detection device for highway engineering comprises a base 1, wherein four corners of the lower end of the base 1 are respectively provided with lifting legs 2, a moving part is provided between the lifting legs 2 located on the same side, and a detection part is provided on the base 1; the detection part comprises a bracket 13 fixedly connected to the upper end surface of the base 1, a driving member 16 is provided on the bracket 13, a coaxially arranged threaded rod 14 is fixedly connected to the output end of the driving member 16, a coaxially arranged moving seat 17 is threadedly connected to the threaded rod 14, and a sampling mechanism is provided on the moving seat 17; the sampling mechanism comprises a support plate 18 fixedly connected to the moving seat 17, an outer cylinder 19 is fixedly connected to the lower end of the support plate 18, an outer cylinder 20 is sleeved on the outer side of the outer cylinder 19, a driving member 24 is provided on the support plate 18, the output end of the driving member 24 extends to the inside of the outer cylinder 19 and is fixedly connected to a coaxially arranged gear 25, the support plate An inner cylinder 126 is rotatably connected to the lower end of the inner cylinder 126, and a tooth groove 27 meshing with the gear 25 is provided on the outer side of the inner cylinder 126. An inner cylinder 28 is fixedly connected to the lower end of the support plate 18 inside the inner cylinder 126. An inner cylinder 3 29 is provided inside the inner cylinder 28. A driving member 30 is provided on the support plate 18. The output end of the driving member 30 is fixedly connected to the upper end of the inner cylinder 3 29. A rotating rod 31 is provided inside the inner cylinder 3 29. A threaded groove 32 is provided on the outer periphery of the rotating rod 31. A block 33 matching the threaded groove 32 is provided on the inner side arm of the inner cylinder 3 29. The lower end of the rotating rod 31 extends to the interior of the inner cylinder 28 and is fixedly connected to a disc 34. Both sides of the outer periphery of the disc 34 are fixedly connected with protrusions 35 respectively. An annular groove 1 36, a vertical groove 37 and an annular groove 2 38 matching the protrusion 35 are provided on the inner side wall of the inner cylinder 28. A cutting component is provided inside the disc 34. Preferably, the opening range of the thread groove 32 matches the rotation angle of the protrusion 35, that is, when the block 33 reaches the two end points of the thread groove 32, the protrusion 35 just rotates to the connection point between the vertical groove 37 and the annular groove 1 36 or the connection point between the vertical groove 37 and the annular groove 2 38, so that the subsequent protrusion 35 enters the vertical groove 37. At the same time, the pitch of the thread groove 32 should not be too large, that is, the thread inclination angle of the thread groove 32 should not be too large, so as to ensure that when the inner cylinder 3 29 and the block 33 move, the rotating rod 31 is first driven to move synchronously with them, rather than rotating. After the protrusion 35 reaches the corresponding position, the rotating rod 31 rotates as the inner cylinder 3 29 and the block 33 continue to move.

[0033] Specifically, Figure 7 and Figure 8As shown, the cutting assembly includes a cavity 39 opened in the inside of the disc 34, a channel 40 is opened in the inside of the protrusion 35, the channel 40 is connected to the cavity 39, a vertical plate 41 is fixedly connected to the inside of the cavity 39, and two telescopic rods 42 are fixedly connected on both sides of the vertical plate 41, and a cutting knife 44 is fixedly connected to the end of the telescopic rod 42 away from the vertical plate 41, and the cutting knife 44 extends to the inside of the channel 40 away from the end of the telescopic rod 42. A spring 43 is sleeved on the outer side of the telescopic rod 42, and the two ends of the spring 43 are respectively abutted against the vertical plate 41 and the cutting knife 44, and a head 45 is fixedly connected to the end of the disc 34 away from the rotating rod 31. Preferably, inner cylinder two 28 and inner cylinder three 29 can be replaced to rotate synchronously with inner cylinder one 26, that is, inner cylinder two 28 is fixedly connected to inner cylinder one 26, inner cylinder three 29 is splined to inner cylinder one 26, and inner cylinder three 29 is rotationally connected to the output end of driving member three 30. In this way, during the drilling process, inner cylinder one 26, inner cylinder two 28 and top head 45 rotate synchronously, which is convenient for better drilling to cope with the ground environment with higher hardness, and does not affect the subsequent cutting work of the cutting assembly. The embodiment in which the top head 45 remains stationary is applied to the ground environment with lower hardness.

[0034] Specifically, Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, the outer periphery of the outer cylinder 20 is fixedly connected with a fixing seat 21, and the fixing seat 21 is fixedly connected with a telescopic rod 1 22, the upper end of the telescopic rod 1 22 is fixedly connected with the lower end of the support plate 18, and the outer side of the telescopic rod 1 22 is sleeved with a spring 1 23, and the two ends of the spring 1 23 are respectively fixedly connected with the fixing seat 21 and the support plate 18. Two vertical grooves 37 are symmetrically opened about the axis of the inner cylinder 28, and the annular groove 1 36 and the annular groove 2 38 are arranged parallel to each other. The two ends of the vertical groove 37 are respectively connected with the annular groove 1 36 and the annular groove 2 38, and a notch is opened on the inner cylinder 28 at the annular groove 2 38 to match the cutting knife 44. The driving member 1 16 and the driving member 2 24 are both servo motors, and the driving member 3 30 is a cylinder. Preferably, the opening range of the notch is as large as possible to ensure that the rotation angle of the two cutting knives 44 is infinitely close to 180 degrees, that is, it can ensure the cutting effect of the two cutting knives 44 cooperating to connect the root position of the sample core with the external road surface structure.

[0035] Specifically, Figure 1 and Figure 2As shown, the moving part includes a connecting rod 1 3 hinged with the lifting foot 2, a connecting rod 2 4 cooperating with the connecting rod 1 3 is hinged on the other lifting foot 2 located on the same side, and a moving wheel 5 is provided on the connecting rod 1 3 and the connecting rod 2 4, a swing rod 6 is rotatably connected to the connecting rod 1 3, a hook 7 is fixedly connected to the lower end of the swing rod 6, a limit rod 1 8 cooperating with the hook 7 is fixedly connected to the connecting rod 2 4, a column 1 9 is provided at the upper end of the swing rod 6, a column 2 10 is provided on the connecting rod 1 3, the column 1 9 and the column 2 10 are connected by a tension spring 11, and a limit rod 2 12 cooperating with the swing rod 6 is fixedly connected to the connecting rod 1 3. There are two moving parts, which are respectively located on both sides of the lower end of the base 1, and the connecting rods 1 3 on the two moving parts are connected by a synchronization rod. By providing a moving part, when the detection device needs to be moved, the moving wheels 5 are lowered to facilitate the movement of the detection device. When sampling, the moving wheels 5 are retracted, and the lifting legs 2 are in contact with the ground to form a support, providing a stable platform for the sampling mechanism. At the same time, the setting of the synchronization rod ensures the synchronous movement of the moving parts on both sides. Preferably, the four lifting legs 2 can be individually controlled to rise and fall by hydraulic rods to cope with uneven terrain, so that the base 1 can be kept as level as possible.

[0036] Specifically, Figure 1 and Figure 3 As shown, a slide bar 15 is provided inside the bracket 13, and the slide bar 15 is slidably connected with the moving seat 17. The setting of the slide bar 15 ensures that the moving seat 17 remains stable during the lifting process.

[0037] In summary, the thickness detection device for highway engineering provided by the present embodiment, when in use, firstly moves the detection device to the area to be detected, and moves the rocker bar 6 to rotate it, so that the hook 7 is disengaged from the limit rod 1 8, and at the same time the tension spring 11 is stretched, and after the hook 7 is disengaged from the limit rod 1 8, the connecting rod 1 3 and the connecting rod 2 4 lose their restrictions, and under the gravity of the base 1, the four lifting legs 2 are in contact with the ground, and the connecting rod 1 3 and the connecting rod 2 4 rotate, so that the moving wheel 5 no longer plays a supporting role, and the threaded rod 14 is driven to rotate through the driving member 16, thereby driving the moving seat 17 to descend until the outer cylinder 20 is in contact with the ground, and as the driving member 1 16 continues to rotate, the moving seat 17 continues to descend, and the outer cylinder 20 is relatively displaced with the outer cylinder 19 after contacting the ground, so that the telescopic rod 122 and the spring 123 are compressed, and then the gear 25 is driven to rotate by the driving member 24, thereby driving the inner cylinder 126 to rotate, and the sampling mechanism is coordinated with the moving seat 17 and the overall descent of the sampling mechanism to sample the highway. After the inner cylinder 126 reaches a sufficient depth to complete the sampling, the driving member 30 pushes the inner cylinder 3 29 to move, and the inner cylinder 3 29 moves through the block 33 to push the rotating rod 31 to move, thereby driving the disc 34 and the head 45 to move, so that the protrusion 35 enters the annular groove 2 from the annular groove 1 36 through the vertical groove 37. 38, the cutting knife 44 in the disc 34 is pushed out by the spring 243, and is embedded in the root device of the sampling core through the notch on the inner cylinder 28. At the same time, the head 45 is embedded in the deeper ground. After the protrusion 35 reaches the annular groove 28, the driving member 30 pushes the inner cylinder 3 29 to continue to move. Since the protrusion 35 is restricted by the annular groove 28 and cannot continue to move, the block 33 and the thread groove 32 slide relative to each other, driving the rotating rod 31 and the disc 34 to rotate, so that the cutting knife 44 rotates in the notch, cutting off the connection between the root position of the sample core and the external road surface structure, and then the moving seat 17 is driven upward by the driving member 16, thereby driving The entire sampling mechanism and the sample core move upward, and the road thickness is detected by the sample core. After the sampling and detection are completed, the cutting knife 44 is pushed back into the inner cylinder 28, and the cutting assembly is reset by the driving member 30. At the same time, when the entire detection device needs to be moved, the connecting rod 1 3 is pressed to make the connecting rod 1 3 contact with the connecting rod 2 4 until the two are respectively kept vertical with the lifting support foot 2. At this time, the hook 7 is locked with the limit rod 1 8 again. Under the restriction of the tension spring 11 and the limit rod 2 12, when there is no external force, the connecting rod 1 3 and the connecting rod 2 4 remain stable. At the same time, the moving wheel 5 is in contact with the ground and lifts the lifting support foot 2 to facilitate the overall movement of the detection device.

[0038] The above description of the embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A thickness detection device for highway engineering, comprising a base (1), characterized in that: Lifting feet (2) are respectively provided at the four corners of the lower end of the base (1); a moving part is provided between the lifting feet (2) located on the same side; and a detection part is provided on the base (1); The detection part comprises a bracket (13) fixedly connected to the upper end surface of the base (1), a driving member (16) being provided on the bracket (13), an output end of the driving member (16) being fixedly connected to a coaxially arranged threaded rod (14), a movable seat (17) being threadedly connected to the threaded rod (14), and a sampling mechanism being provided on the movable seat (17); The sampling mechanism comprises a support plate (18) fixedly connected to the movable seat (17); the lower end of the support plate (18) is fixedly connected to an outer cylinder 1 (19); an outer cylinder 2 (20) is sleeved on the outer side of the outer cylinder 1 (19); a driving member 2 (24) is provided on the support plate (18); an output end of the driving member 2 (24) extends to the inside of the outer cylinder 1 (19) and is fixedly connected to a coaxially arranged gear (25); the lower end of the support plate (18) is rotatably connected to an inner cylinder 1 (26); a tooth groove (27) meshingly connected to the gear (25) is provided on the outer side of the inner cylinder 1 (26); an inner cylinder 2 (28) is fixedly connected to the lower end of the support plate (18) inside the inner cylinder 1 (26); an inner cylinder 3 (29) is provided inside the inner cylinder 2 (28); The support plate (18) is provided with a driving member 3 (30), the output end of the driving member 3 (30) is fixedly connected to the upper end of the inner cylinder 3 (29), a rotating rod (31) is provided inside the inner cylinder 3 (29), a thread groove (32) is provided on the outer circumference of the rotating rod (31), a clamping block (33) matching with the thread groove (32) is provided on the inner side arm of the inner cylinder 3 (29), the lower end of the rotating rod (31) extends to the inside of the inner cylinder 2 (28) and is fixedly connected with a disk (34), the outer circumference of the disk (34) is fixedly connected with protrusions (35) on both sides, the inner side wall of the inner cylinder 2 (28) is provided with an annular groove 1 (36), a vertical groove (37) and an annular groove 2 (38) matching with the protrusion (35), and a cutting component is provided inside the disk (34); The cutting assembly comprises a cavity (39) formed inside the disc (34); a channel (40) is formed inside the protrusion (35); the channel (40) is communicated with the cavity (39); a vertical plate (41) is fixedly connected inside the cavity (39); two telescopic rods (42) are fixedly connected to both sides of the vertical plate (41); a cutting knife (44) is fixedly connected to one end of the telescopic rod (42) away from the vertical plate (41); the cutting knife (44) extends to the inside of the channel (40) away from one end of the telescopic rod (42); a second spring (43) is sleeved on the outer side of the second telescopic rod (42); two ends of the second spring (43) are respectively in contact with the vertical plate (41) and the cutting knife (44); and a top (45) is fixedly connected to one end of the disc (34) away from the rotating rod (31).

2. A thickness detection device for highway engineering according to claim 1, characterized in that: A fixing seat (21) is fixedly connected to the outer periphery of the second outer cylinder (20), a telescopic rod (22) is fixedly connected to the fixing seat (21), an upper end of the telescopic rod (22) is fixedly connected to the lower end of the support plate (18), a spring (23) is sleeved on the outer side of the telescopic rod (22), and two ends of the spring (23) are respectively fixedly connected to the fixing seat (21) and the support plate (18).

3. A thickness detection device for highway engineering according to claim 2, characterized in that: Two vertical grooves (37) are symmetrically formed about the axis of the second inner cylinder (28); the first annular groove (36) and the second annular groove (38) are arranged parallel to each other; two ends of the vertical groove (37) are respectively connected to the first annular groove (36) and the second annular groove (38); a notch matching with the cutting knife (44) is formed on the second inner cylinder (28) at the second annular groove (38).

4. A thickness detection device for highway engineering according to claim 3, characterized in that: The driving member 1 (16) and the driving member 2 (24) are both servo motors, and the driving member 3 (30) is a cylinder.

5. A thickness detection device for highway engineering according to claim 1, characterized in that: The moving part comprises a connecting rod (3) hinged to the lifting foot (2); a connecting rod (4) cooperating with the connecting rod (3) is hingedly connected to the other lifting foot (2) located on the same side; both the connecting rod (3) and the connecting rod (4) are provided with moving wheels (5); a swing rod (6) is rotatably connected to the connecting rod (3); a hook (7) is fixedly connected to the lower end of the swing rod (6); a limit rod (8) cooperating with the hook (7) is fixedly connected to the connecting rod (4); a column (9) is provided at the upper end of the swing rod (6); a column (10) is provided on the connecting rod (3); the column (9) and the column (10) are connected via a tension spring (11); and a limit rod (12) cooperating with the swing rod (6) is fixedly connected to the connecting rod (3).

6. A thickness detection device for highway engineering according to claim 5, characterized in that: The movable parts are provided with two, and the two movable parts are respectively located on both sides of the lower end of the base (1), and the connecting rods (3) on the two movable parts are connected by a synchronization rod.

7. A thickness detection device for highway engineering according to claim 1, characterized in that: A sliding rod (15) is provided inside the bracket (13), and the sliding rod (15) is slidably connected to the movable seat (17).

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