A highway subgrade flatness detection device and a detection method thereof

Abstract

The present application relates to the technical field of highway detection, in particular to a highway subgrade flatness detection device and its detection method, which comprises a support body, a detection structure connected to the lower part of the support body, the detection structure comprises a sleeve pipe rotating on the lower part of the support body, a winding pipe and a fixing table are fixedly connected to the sleeve pipe, a pull rope is wound on the winding pipe, the upper end of the pull rope is fixed with an auxiliary pipe, a reset member is fixed to the bottom of the fixing table, a rotating member is connected to the reset member, the rotating member comprises a storage housing and a transmission column penetrating through the storage housing, a winding disc is fixed to the inside of the storage housing on the transmission column, the lower end of the pull rope is wound with the winding disc, in actual use, the transmission screw rod can drive the displacement turntable to move down, at this time, the bent support rod will be turned on the displacement turntable, at this time, the use position of the flatness detection member can also be moved, and the flatness detection member can detect the highway subgrade at a farther position.

Description

Technical Field

[0001] This invention relates to the field of highway testing technology, specifically to a highway subgrade smoothness testing device and its testing method. Background Technology

[0002] The main purpose of the road surface smoothness testing device is to evaluate the road surface quality. Road surface smoothness is one of the main technical indicators for evaluating road surface quality. It is related to driving safety and comfort, as well as the magnitude of the impact force on the road surface and its service life. Therefore, it is necessary to perform the smoothness testing operation during the road surface testing process of highway engineering.

[0003] A search revealed that existing patent document CN117265970B discloses a highway pavement smoothness detection device for use in detecting the smoothness of highway subgrade. The inclined hinge rod in the device can drive the guide slide rod to slide inside the curved guide groove plate through the rectangular guide frame plate, thereby realizing the guide slide rod driving the distance detection probe to move the position of the use probe, and realizing the distance detection probe to detect the smoothness of the highway pavement.

[0004] While this device can indeed detect the smoothness of highway pavements in practical use, it still has some shortcomings, such as:

[0005] When the guide rod in this device slides inside the curved guide groove, it can move the distance detection probe to its working position. However, the guide rod will also cause the limit linkage rings to slide at the upper limit of the curved guide groove. Since the curved guide groove is an open structure, dust can easily accumulate inside it. When there is a lot of dust inside the curved guide groove, it will affect the movement of the limit linkage rings inside the curved guide groove. When the limit linkage rings cannot move easily inside the curved guide groove, it will easily cause the curved guide groove to deform, which will affect the movement trajectory of the distance detection probe.

[0006] Therefore, we propose a highway subgrade smoothness testing device and its testing method. Summary of the Invention

[0007] One of the technical problems to be solved by this application is that when the limiting linkage ring is not convenient to move inside the curved guide groove plate, it is easy to cause the curved guide groove plate to deform.

[0008] To address the aforementioned technical problems, this application provides a highway subgrade smoothness testing device, comprising a support body, a testing structure connected to the lower part of the support body, the testing structure including a sleeve pipe rotatably mounted on the lower part of the support body, a winding pipe and a fixing platform fixedly connected to the sleeve pipe, a pull rope wound around the winding pipe, the upper end of the pull rope fixed to an auxiliary pipe, a reset member fixed to the bottom of the fixing platform, a rotating member connected to the reset member, the rotating member including a housing and a transmission column penetrating the housing, a winding disc fixed inside the housing on the transmission column, the lower end of the pull rope wound around the winding disc, a connecting platform fixedly connected to the lower end of the transmission column, and a smoothness testing component fixedly connected to the bottom surface of the connecting platform.

[0009] In some embodiments, a displacement detection element is fixedly connected to the bottom surface of the fixed platform on one side of the reset element. The displacement detection element and the reset element are arranged side by side, and the fixed platform does not contact the winding pipe.

[0010] In some embodiments, the support body includes a displacement turntable and an auxiliary connecting pipe abutting against the displacement turntable. The upper end of the auxiliary connecting pipe is fixedly connected to a control structure and a transmission motor, and a transmission screw is rotatably connected to the auxiliary connecting pipe.

[0011] In some embodiments, a placement platform is distributed below the support body, the placement platform is rotatably connected to the lower end of the transmission screw, and the upper part of the transmission screw passes through the displacement turntable and the auxiliary connecting pipe.

[0012] In some embodiments, the upper end of the transmission screw is fixedly connected to the output shaft of the transmission motor, the upper part of the transmission screw is threadedly connected to the displacement turntable, and the lower part of the transmission screw is fixedly connected to an auxiliary frame.

[0013] In some embodiments, the displacement turntable has equidistantly rotating bent support rods, the auxiliary frame and the bent support rods are movably connected, and the bent support rods are hollow structures.

[0014] In some embodiments, the inner cavity of the bent support rod is fixedly connected to an abutment post, through which the pull rope and the bent support rod pass, and the portion through which the pull rope and the bent support rod pass abut against the abutment post.

[0015] In some embodiments, a connecting rod is fixedly connected to the lower end of the bent support rod, and a through rod is fixedly connected to the connecting support rod, wherein the through rod passes through the sleeve pipe and the connecting pipe.

[0016] In some embodiments, the reset member includes a connecting cavity and an abutment cover fixedly connected to the connecting cavity. A through end is fixedly connected to one end of the abutment cover away from the connecting cavity, and a rotating rod passes through the through end.

[0017] In some embodiments, the rotating rod is rotatably connected to the through end and the connecting cavity, a return spring is fixedly connected between the rotating rod and the connecting cavity, a plug-in end is fixedly connected to the lower end of the rotating rod, and a plug-in groove is provided at the upper end of the transmission column, the plug-in end is engaged with the transmission column through the plug-in groove.

[0018] A method for detecting the smoothness of highway subgrade includes the following steps:

[0019] S1. Pre-install the control program into the internal control structure, and then place the placement platform on the roadbed of the highway to be tested;

[0020] S2. The control structure controls the operation of the drive motor. The output shaft of the drive motor can drive the drive screw to rotate in the forward direction. At this time, the drive screw can drive the displacement turntable to move downward on the drive screw, which can make the bending support rod unfold on the auxiliary frame, realizing the adjustment of the usage position of the flatness detection piece and the displacement detection piece.

[0021] S3. When the bent support rod is unfolded on the auxiliary frame, the displacement turntable can be separated from the lower end of the auxiliary pipe. At this time, the pull rope on the auxiliary pipe can be driven to rotate around the pipe. At this time, the use angle of the flatness detection piece and the displacement detection piece can be adjusted.

[0022] S4. When the pull rope drives the winding pipe to rotate, the pull rope can also drive the transmission column to rotate through the winding disc. At this time, the transmission column can drive the flatness detection piece to rotate through the connecting table. This allows the flatness detection piece to detect the flatness of the roadbed while rotating. At the same time, the transmission column can drive the rotating rod to rotate, and the reset spring on the rotating rod can work by storing force.

[0023] S5. When the smoothness testing device detects the smoothness of the roadbed, the smoothness testing device and the displacement testing device can transmit the detection information to the control structure. At this time, the control structure can process the information transmitted by the smoothness testing device and the displacement testing device and display it to the staff.

[0024] S6. After the flatness detection piece and displacement detection piece detect the flatness of the highway subgrade, the control structure controls the drive motor to work. The output shaft of the drive motor can drive the drive screw to rotate in the opposite direction. At this time, the drive screw can drive the displacement turntable to move upward on the drive screw.

[0025] S7. When the displacement turntable moves upward on the transmission screw, the repulsive force generated by the reset spring can drive the rotating rod to rotate. At this time, the rotating rod can drive the winding disc to wind up the pull rope through the transmission column. At the same time, the bent support rod on the auxiliary frame can also drive the flatness detection piece and the displacement detection piece to reset.

[0026] S8. When the bending support rod drives the flatness detection component and displacement detection component to reset, the flatness detection component can also continuously detect the flatness of the highway subgrade and transmit the flatness detection information of the highway subgrade to the control structure.

[0027] This invention has at least the following beneficial effects:

[0028] In actual use, the transmission screw can drive the displacement turntable to move downwards. At this time, the bending support rod will flip on the displacement turntable, and the position of the flatness testing piece can also be moved, enabling the flatness testing piece to test the roadbed at a more distant location.

[0029] In actual use, the angle of the pull rope on the flatness testing component can be adjusted by the connecting pipe, which makes it easier for the connecting pipe to drive the flatness testing component to test the flatness of the roadbed.

[0030] In actual use, the transmission screw can drive the displacement turntable to move down, and the bending support rod will flip on the displacement turntable. At this time, the position of the flatness testing piece can also be moved. At the same time, the pull rope on the auxiliary pipe can also drive the transmission column to rotate. This allows the transmission column to drive the flatness testing piece to rotate through the connecting platform, enabling the flatness testing piece to perform multiple flatness tests on the roadbed. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the connection structure of the transmission screw, auxiliary connecting pipe, and placement platform in this invention;

[0033] Figure 3 This is a schematic diagram of the structure of the support body in this invention;

[0034] Figure 4 This is a schematic diagram of the connection structure between the pull rope, auxiliary connector, and displacement turntable in this invention;

[0035] Figure 5 This is a schematic diagram of the connection structure between the detection structure and the bent support rod in this invention;

[0036] Figure 6 This is a schematic diagram showing the distribution of the abutment post and the pull rope in this invention;

[0037] Figure 7 This is a schematic diagram of the connection structure between the reset spring and the rotating rod in this invention;

[0038] Figure 8 This is a schematic diagram of the connection structure between the pull rope and the transmission column in this invention;

[0039] Figure 9This is a schematic diagram showing the distribution of the flatness detection component and the reset component in this invention;

[0040] Figure 10 This is a schematic diagram of the connection structure between the pull rope and the winding pipe in this invention.

[0041] In the diagram: 1. Control structure; 2. Drive motor; 3. Auxiliary connecting pipe; 4. Displacement turntable; 5. Drive screw; 6. Bending support rod; 61. Abutment column; 62. Connecting support rod; 7. Auxiliary frame; 8. Placement platform; 9. Detection structure; 91. Through rod; 92. Sleeve connecting pipe; 93. Winding connecting pipe; 94. Fixing platform; 95. Displacement detection component; 96. Reset component; 961. Connecting cavity; 962. Rotating rod; 963. Reset spring; 964. Abutment cover; 965. Through end; 966. Insertion end; 97. Rotating component; 971. Storage shell; 972. Insertion slot; 973. Winding disc; 974. Drive column; 98. Connecting platform; 99. Flatness detection component; 10. Pull rope; 11. Support body. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Example 1: Please refer to Figure 1-10 The present invention provides a technical solution:

[0044] A roadbed smoothness testing device includes a support body 11. A testing structure 9 is connected to the lower part of the support body 11. The testing structure 9 includes a sleeve pipe 92 rotatably mounted on the lower part of the support body 11. A winding pipe 93 and a fixed platform 94 are fixedly connected to the sleeve pipe 92. A pull rope 10 is wound around the winding pipe 93. The upper end of the pull rope 10 is fixed to the auxiliary pipe 3. A reset member 96 is fixed to the bottom of the fixed platform 94. A rotating member 97 is connected to the reset member 96. The rotating member 97 includes a housing 971 and a transmission column 974 penetrating the housing 971. A winding disc 973 is fixed inside the housing 971 on the transmission column 974. The lower end of the pull rope 10 is wound around the winding disc 973. A connecting platform 98 is fixedly connected to the lower end of the transmission column 974. A smoothness testing member 99 is fixedly connected to the bottom surface of the connecting platform 98.

[0045] The pull rope 10 can be selected from the existing steel wire rope on the market. When the auxiliary connector 3 pulls the pull rope 10, the pull rope 10 is used to drive the transmission column 974 to rotate. The flatness detection component 99 is distributed on the connecting platform 98 at one end away from the transmission column 974. The advantage of this design is that the flatness detection component 99 can detect a larger range of highway subgrade.

[0046] In actual use, the auxiliary connector 3 can pull the pull rope 10. At this time, the pull rope 10 can drive the transmission column 974 and the winding disc 973 to rotate around the transmission column 974. This allows the transmission column 974 to drive the connecting table 98 to rotate, which in turn allows the connecting table 98 to drive the flatness detection piece 99 to rotate around the transmission column 974, thus enabling the flatness detection piece 99 to detect the flatness of the highway subgrade.

[0047] Example 2: Based on Example 1, this example proposes a technical solution:

[0048] The bottom surface of the fixed platform 94 is located on one side of the reset component 96 and a displacement detection component 95 is fixedly connected thereto. The displacement detection component 95 and the reset component 96 are arranged side by side, and the fixed platform 94 does not contact the winding tube 93.

[0049] The displacement detection component 95 can detect the distance between the flatness detection component 99 and the roadbed in real time, which makes it easier for staff to understand the height of the flatness detection component 99 when it detects the roadbed. The fixed platform 94 is set to not contact the bypass pipe 93, which can prevent the bypass pipe 93 from affecting the rotation of the fixed platform 94.

[0050] The support body 11 includes a displacement turntable 4 and an auxiliary pipe 3 abutting against the displacement turntable 4. The upper end of the auxiliary pipe 3 is fixedly connected to a control structure 1 and a transmission motor 2, and a transmission screw 5 is rotatably connected to the auxiliary pipe 3.

[0051] The transmission screw 5 is a rod-shaped structure with a thread in the middle. The control structure 1 can be a control panel available on the market. The control structure 1 has a PLC control program installed inside. The control structure 1 can control the operation of the transmission motor 2. At the same time, the control structure 1 can receive and process the information of the displacement detection component 95 and the flatness detection component 99, which can facilitate the staff to understand the detection information of the displacement detection component 95 and the flatness detection component 99 on the roadbed.

[0052] A placement platform 8 is distributed below the support body 11. The placement platform 8 is rotatably connected to the lower end of the transmission screw 5. The upper part of the transmission screw 5 passes through the displacement turntable 4 and the auxiliary pipe 3.

[0053] The bottom surface of the placement platform 8 is in contact with the roadbed, which allows the entire testing equipment to be placed on the roadbed. The auxiliary pipe 3 can limit the movement trajectory of the displacement turntable 4, which can prevent the testing end of the flatness testing piece 99 from colliding with the transmission screw 5.

[0054] The upper end of the transmission screw 5 is fixedly connected to the output shaft of the transmission motor 2, the upper part of the transmission screw 5 is threadedly connected to the displacement turntable 4, and the lower part of the transmission screw 5 is fixedly connected to the auxiliary frame 7.

[0055] The displacement turntable 4 has bent support rods 6 rotating at equal intervals. The auxiliary frame 7 and the bent support rods 6 are movably connected. The bent support rods 6 have a hollow structure.

[0056] The number of bent support rods 6 is set according to the actual use. For ease of understanding, the attached diagram of this manual shows three bent support rods 6.

[0057] In actual use, the control structure 1 can control the transmission motor 2, displacement detection component 95, and flatness detection component 99 through a PLC control program. The output shaft of the transmission motor 2 can drive the transmission screw 5 to rotate. At this time, the displacement turntable 4 can move on the transmission screw 5. When the displacement turntable 4 moves downward, it can drive the bending support rod 6 to unfold on the auxiliary frame 7. This part is well known to those skilled in the art and will not be described in detail here. This can enable the bending support rod 6 to drive the displacement detection component 95 and flatness detection component 99 to detect a larger range of highway subgrade.

[0058] Example 3: Based on Example 2, this example proposes a technical solution:

[0059] The inner cavity of the bent support rod 6 is fixedly connected to the abutment post 61, through which the pull rope 10 and the bent support rod 6 pass, and the part through which the pull rope 10 and the bent support rod 6 pass abut against the abutment post 61.

[0060] When the pull rope 10 and the abutting post 61 abut, friction between the pull rope 10 and the inner wall of the bent support rod 6 can be avoided, which can extend the service life of the pull rope 10 and prevent large friction between the pull rope 10 and the inner wall of the bent support rod 6. This can achieve stable connection between the pull rope 10 and the bent support rod 6.

[0061] The lower end of the bent support rod 6 is fixedly connected to the connecting support rod 62, and the connecting support rod 62 is fixedly connected to the through rod 91, through rod 91, sleeve pipe 92, and winding pipe 93 passing through it;

[0062] The bypass pipe 93 is fixedly connected to the sleeve pipe 92. At the same time, the bypass pipe 93 can drive the sleeve pipe 92 to rotate on the through rod 91, which can realize the adjustment of the detection angle of the displacement detection element 95 and the flatness detection element 99 on the roadbed.

[0063] The reset component 96 includes a connecting cavity 961 and an abutment cover 964 fixedly connected to the connecting cavity 961. A through end 965 is fixedly connected to one end of the abutment cover 964 away from the connecting cavity 961, and a rotating rod 962 passes through the through end 965.

[0064] The through end 965 and the connecting cavity 961 are fixed together. When the rotating rod 962 and the through end 965 pass through each other, the through end 965 can limit the rotation of the rotating rod 962, so that the rotating rod 962 can rotate stably inside the connecting cavity 961.

[0065] The rotating rod 962 is rotatably connected through the through end 965 and the connecting cavity 961. A return spring 963 is fixedly connected between the rotating rod 962 and the connecting cavity 961. The lower end of the rotating rod 962 is fixedly connected to the insertion end 966. The upper end of the transmission column 974 is provided with an insertion groove 972. The insertion end 966 is engaged with the transmission column 974 through the insertion groove 972.

[0066] The connecting cavity 961 has a cylindrical barrel structure. The housing 971 can be fixed on the fixed platform 94 by the abutment cover 964. When the abutment cover 964 and the housing 971 are fixedly connected, the plug end 966 can be engaged with the transmission column 974 through the plug groove 972. At this time, the abutment cover 964 can protect the connection part of the plug end 966 and the transmission column 974, and prevent external objects from contacting the connection part of the plug end 966 and the transmission column 974.

[0067] When the transmission screw 5 drives the displacement turntable 4 to move downward in the testing equipment, the bent support rod 6 on the displacement turntable 4 will unfold. At this time, the auxiliary connecting pipe 3 will drive the pull rope 10 to separate from the winding disc 973. The friction of the pull rope 10 on the winding disc 973 can drive the winding disc 973 to rotate around the transmission column 974. At this time, the transmission column 974 can drive the rotating rod 962 to rotate through the plug-in end 966. The rotating rod 962 can drive the return spring 963 to deform. The repulsive force generated when the return spring 963 deforms can be used to drive the rotating rod 962. 62 Reset: When the transmission screw 5 drives the displacement turntable 4 to move upward, the bent support rod 6 on the displacement turntable 4 will retract. The repulsive force generated by the deformation of the reset spring 963 can drive the rotating rod 962 to reset. At this time, the rotating rod 962 can drive the transmission column 974 to rotate through the plug end 966. The transmission column 974 can drive the winding disc 973 to store the pull rope 10. When the pull rope 10 drives the transmission column 974 to rotate through the winding disc 973, the transmission column 974 can drive the flatness detection piece 99 to adjust its position through the connecting table 98.

[0068] A method for detecting the smoothness of highway subgrade includes the following steps:

[0069] S1. Pre-load the control program into the control structure 1, and then place the placement platform 8 on the roadbed to be tested;

[0070] S2. Control structure 1 controls the operation of transmission motor 2. The output shaft of transmission motor 2 can drive transmission screw 5 to rotate in the forward direction. At this time, transmission screw 5 can drive displacement turntable 4 to move downward on transmission screw 5, which can make bending support rod 6 unfold on auxiliary frame 7, realizing the adjustment of the usage position of flatness detection piece 99 and displacement detection piece 95.

[0071] S3. When the bent support rod 6 is unfolded on the auxiliary frame 7, the displacement turntable 4 can be separated from the lower end of the auxiliary pipe 3. At this time, the pull rope 10 on the auxiliary pipe 3 can be driven to rotate around the pipe 93. At this time, the use angle of the flatness detection piece 99 and the displacement detection piece 95 can be adjusted.

[0072] S4. When the pull rope 10 drives the winding pipe 93 to rotate, the pull rope 10 can also drive the transmission column 974 to rotate through the winding disc 973. At this time, the transmission column 974 can drive the flatness detection piece 99 to rotate through the connecting table 98, so that the flatness detection piece 99 can detect the flatness of the roadbed while rotating. At the same time, the transmission column 974 can drive the rotating rod 962 to rotate, and the return spring 963 on the rotating rod 962 can work by storing force.

[0073] S5. When the flatness detection component 99 detects the flatness of the roadbed, the flatness detection component 99 and the displacement detection component 95 can transmit the detection information to the control structure 1. At this time, the control structure 1 can process the information transmitted by the flatness detection component 99 and the displacement detection component 95 and display it to the staff.

[0074] S6. After the flatness detection piece 99 and the displacement detection piece 95 detect the flatness of the roadbed, the control structure 1 controls the transmission motor 2 to work. The output shaft of the transmission motor 2 can drive the transmission screw 5 to rotate in the opposite direction. At this time, the transmission screw 5 can drive the displacement turntable 4 to move upward on the transmission screw 5.

[0075] S7. When the displacement turntable 4 moves upward on the transmission screw 5, the repulsive force generated by the reset spring 963 can drive the rotating rod 962 to rotate. At this time, the rotating rod 962 can drive the winding disc 973 to wind the pull rope 10 through the transmission column 974. At the same time, the bent support rod 6 on the auxiliary frame 7 can also drive the flatness detection piece 99 and the displacement detection piece 95 to reset.

[0076] S8. When the bending support rod 6 drives the flatness detection component 99 and the displacement detection component 95 to reset, the flatness detection component 99 can also continuously detect the flatness of the roadbed and transmit the information of the roadbed flatness detection to the control structure 1.

[0077] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0078] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A highway subgrade smoothness testing device, comprising a support body (11), characterized in that: A detection structure (9) is connected to the lower part of the support body (11). The detection structure (9) includes a sleeve (92) that rotates on the lower part of the support body (11). A winding tube (93) and a fixing platform (94) are fixedly connected to the sleeve (92). A pull rope (10) is wound around the winding tube (93). The upper end of the pull rope (10) is fixed to the auxiliary tube (3). A reset member (96) is fixed to the bottom of the fixing platform (94). A reset member (96) is connected to the reset member (96). Rotating component (97), the rotating component (97) includes a housing (971) and a transmission column (974) passing through the housing (971). A winding disc (973) is fixed inside the housing (971) on the transmission column (974). The lower end of the pull rope (10) is wound around the winding disc (973). A connecting platform (98) is fixedly connected to the lower end of the transmission column (974). A flatness detection component (99) is fixedly connected to the bottom surface of the connecting platform (98). The support body (11) includes a displacement turntable (4) and an auxiliary pipe (3) abutting on the displacement turntable (4). The displacement turntable (4) has bent support rods (6) rotating at equal intervals. The bent support rods (6) are hollow structures. The inner cavity of the bent support rod (6) is fixedly connected to an abutment post (61), the pull rope (10) and the bent support rod (6) pass through it, and the part through which the pull rope (10) and the bent support rod (6) pass abuts against the abutment post (61). The lower end of the bent support rod (6) is fixedly connected to a connecting support rod (62), and a through rod (91) is fixedly connected to the connecting support rod (62). The through rod (91) passes through the sleeve pipe (92) and the winding pipe (93). The reset component (96) includes a connecting cavity (961) and an abutment cover (964) fixedly connected to the connecting cavity (961). A through end (965) is fixedly connected to one end of the abutment cover (964) away from the connecting cavity (961). A rotating rod (962) passes through the through end (965). The rotating rod (962) passes through the through end (965) and is rotatably connected to the connecting cavity (961). A reset spring (963) is fixedly connected between the rotating rod (962) and the connecting cavity (961). A plug-in end (966) is fixedly connected to the lower end of the rotating rod (962). A plug-in groove (972) is provided at the upper end of the transmission column (974). The plug-in end (966) is engaged with the transmission column (974) through the plug-in groove (972).

2. The highway subgrade smoothness testing equipment according to claim 1, characterized in that: The bottom surface of the fixed platform (94) is fixedly connected to a displacement detection element (95) on one side of the reset element (96). The displacement detection element (95) and the reset element (96) are arranged side by side. The fixed platform (94) does not contact the winding pipe (93).

3. The highway subgrade smoothness testing equipment according to claim 2, characterized in that: The upper end of the auxiliary pipe (3) is fixedly connected to a control structure (1) and a transmission motor (2), and a transmission screw (5) is rotatably connected to the auxiliary pipe (3).

4. The highway subgrade smoothness testing equipment according to claim 3, characterized in that: The support body (11) has a placement platform (8) distributed below it. The placement platform (8) is rotatably connected to the lower end of the transmission screw (5). The upper part of the transmission screw (5) passes through the displacement turntable (4) and the auxiliary pipe (3).

5. The highway subgrade smoothness testing equipment according to claim 4, characterized in that: The upper end of the transmission screw (5) is fixedly connected to the output shaft of the transmission motor (2), the upper part of the transmission screw (5) is threadedly connected to the displacement turntable (4), the lower part of the transmission screw (5) is fixedly connected to an auxiliary frame (7), and the auxiliary frame (7) is movably connected to the bent support rod (6).

6. A method for detecting the smoothness of a highway subgrade, using the smoothness detection equipment described in claim 5, characterized in that, Includes the following steps: S1. Pre-install the control program into the control structure (1), and then place the placement platform (8) on the roadbed to be tested; S2, control structure (1) controls the operation of transmission motor (2). The output shaft of transmission motor (2) can drive transmission screw (5) to rotate in the forward direction. At this time, transmission screw (5) can drive displacement turntable (4) to move downward on transmission screw (5), so that bending support rod (6) can be unfolded on auxiliary frame (7) to realize the adjustment of the use position of flatness detection piece (99) and displacement detection piece (95); S3. When the bent support rod (6) is unfolded on the auxiliary frame (7), the displacement turntable (4) can be separated from the lower end of the auxiliary pipe (3). At this time, the pull rope (10) on the auxiliary pipe (3) can be driven to rotate around the pipe (93). At this time, the use angle of the flatness detection piece (99) and the displacement detection piece (95) can be adjusted. S4. When the pull rope (10) drives the winding pipe (93) to rotate, the pull rope (10) can also drive the transmission column (974) to rotate through the winding disc (973). At this time, the transmission column (974) can drive the flatness detection piece (99) to rotate through the connecting table (98). This allows the flatness detection piece (99) to detect the flatness of the roadbed while rotating. At the same time, the transmission column (974) can drive the rotating rod (962) to rotate. The reset spring (963) on the rotating rod (962) can store energy. S5. When the smoothness detection component (99) detects the smoothness of the roadbed, the smoothness detection component (99) and the displacement detection component (95) can transmit the detection information to the control structure (1). At this time, the control structure (1) can process the information transmitted by the smoothness detection component (99) and the displacement detection component (95) and display it to the staff. S6. After the flatness detection piece (99) and displacement detection piece (95) detect the flatness of the roadbed, the control structure (1) controls the transmission motor (2) to work. The output shaft of the transmission motor (2) can drive the transmission screw (5) to rotate in the opposite direction. At this time, the transmission screw (5) can drive the displacement turntable (4) to move upward on the transmission screw (5). S7. When the displacement turntable (4) moves upward on the transmission screw (5), the repulsive force generated by the reset spring (963) can drive the rotating rod (962) to rotate. At this time, the rotating rod (962) can drive the winding disc (973) to wind up the pull rope (10) through the transmission column (974). At the same time, the bent support rod (6) on the auxiliary frame (7) can also drive the flatness detection piece (99) and the displacement detection piece (95) to reset. S8. When the bending support rod (6) drives the flatness detection component (99) and displacement detection component (95) to reset, the flatness detection component (99) can also continuously detect the flatness of the roadbed and transmit the information of the roadbed flatness detection to the control structure (1).

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