A road surface concrete finishing device

By using a cement scraper and a material feeding platform structure in the road concrete leveling device, the problem of cement particles adhering to the leveling roller is solved, achieving a more efficient road leveling and repair effect.

CN224451326UActive Publication Date: 2026-07-03JINAN TONGDA HIGHWAY ENG CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
JINAN TONGDA HIGHWAY ENG CO LTD
Filing Date
2024-12-31
Publication Date
2026-07-03

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    Figure CN224451326U_ABST
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Abstract

This utility model relates to the field of road construction equipment technology, and in particular to a road concrete leveling device, including a bottom frame, a triangular frame at the upper end of the bottom frame, the lower end of the triangular frame being fixedly connected to the upper end of the bottom frame, a middle plate in the middle of the triangular frame, the front and rear ends of the middle plate being fixedly connected to the inner side of the triangular frame, three adjusting bolts on the middle plate being evenly distributed in a rectangular array from left to right, the adjusting bolts having threads in the middle, and the middle of the adjusting bolts being connected to the middle plate through the threads, a fixed frame on the lower side of the middle plate, the lower end of the adjusting bolts being connected to the upper end of the fixed frame through a rotating bearing, and a locking spring between the middle plate and the fixed frame, the locking spring being sleeved on the adjusting bolts. This utility model solves the problem of existing leveling rollers having concrete particles adhering to them, and reduces the limitations of repairing road surface depressions and the problem of insufficient compaction.
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Description

Technical Field

[0001] This utility model relates to the field of road construction equipment technology, and in particular to a road concrete leveling device. Background Technology

[0002] With the increasing demand for municipal construction and rapid economic development in my country, numerous airports, ports, and highways have been built. Previously, concrete leveling relied entirely on manual labor, resulting in low flatness, low efficiency, and high labor intensity, failing to meet market demands. However, with technological advancements, concrete screed machines have seen significant development in my country. These machines are road construction machinery that level excess concrete during the paving process. They are widely used for concrete surface paving and leveling in projects such as highways, municipal roads, airport runways, water conservancy projects, and slopes.

[0003] Existing leveling rollers tend to have concrete particles adhering to them, which reduces the smoothness of the concrete leveling and causes depressions in the road surface that require manual repair. This has significant limitations and results in low-quality compaction after repair. Utility Model Content

[0004] This utility model proposes a concrete road surface leveling device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A concrete road surface leveling device includes a triangular frame, a bottom frame, a material feeding platform, a middle plate, a sliding groove, a roller groove, a material feeding bin, a material feeding cylinder, a micro motor, an adjusting screw, an auxiliary frame, a front auxiliary leveling roller, a rear support, a connecting elbow, a rear support rod, a locking plate, supporting rubber legs, a linkage plate, a leveling roller motor, adjusting bolts, a locking spring, a fixed frame, a cement scraper, a double-headed hydraulic cylinder, a first main leveling roller, a second main leveling roller, a telescopic cylinder, a front support arm, supporting rollers, a material feeding hydraulic cylinder, and a material feeding blocking plate. The bottom frame has a triangular frame at its upper end, the lower end of which is fixedly connected to the upper end of the bottom frame. The middle plate is located in the middle of the triangular frame, and its front and rear ends are fixedly connected to the inner side of the triangular frame. The intermediate plate has three adjusting bolts, which are evenly distributed in a rectangular array from left to right. Each adjusting bolt has a threaded center, connecting to the intermediate plate via the thread. A fixed frame is located on the lower side of the intermediate plate, with the lower end of each adjusting bolt connected to the upper end of the fixed frame via a rotating bearing. A locking spring is located between the intermediate plate and the fixed frame, and the locking spring is fitted onto the adjusting bolt. A pair of cement scrapers are symmetrically arranged at the front and rear of the fixed frame, with their inner left and right ends hinged to the front and rear ends of the fixed frame. A double-headed hydraulic cylinder is located on the lower side of the fixed frame, with its upper end fixedly connected to the lower side of the fixed frame. The double-headed hydraulic cylinder outputs power from both its front and rear sides. The bottom frame is hinged to the lower center of a pair of cement scrapers. A second main leveling roller and a first main leveling roller are symmetrically arranged in the bottom frame. Both ends of the second and first main leveling rollers are connected to the bottom frame via rotating bearings. A leveling roller motor is located at the left end of each of the second and first main leveling rollers. The right side of the leveling roller motor is fixedly connected to the left end of the bottom frame. The right output end of the leveling roller motor is connected to the left end of the second and first main leveling rollers via a coupling for transmission. A feeding platform is located at the front of the bottom frame. The lower rear end of the feeding platform is fixedly connected to the front end of the bottom frame. A sliding groove is formed at the upper end of the feeding platform, and a feeding cylinder is located within the sliding groove. A roller groove is formed at the front of the sliding groove, and a roller groove is formed at the rear of the feeding cylinder. An adjusting screw is provided, with its left and right ends connected to the upper side of the feeding platform via rotating bearings and bearing seats. A micro motor is located on the right side of the adjusting screw, with its left end fixedly connected to the right side of the feeding platform. The output end of the micro motor on the left side is connected to the right end of the adjusting screw via a coupling for transmission. The rear end of the feeding cylinder is threadedly connected to the adjusting screw. A front support arm is located at the front end of the feeding cylinder, with its inner end fixedly connected to the front end of the feeding cylinder. A support roller is located on the lower side of the front support arm, and the support roller is movably connected to the lower side of the front support arm via a pin. The bottom of the support roller is engaged in a roller groove. A feeding bin is located at the upper end of the feeding cylinder, with its lower end fixedly connected to and communicating with the upper end of the feeding cylinder.

[0007] Furthermore, a feeding hydraulic cylinder is provided on the upper side of the feeding hopper. The four ends of the feeding hydraulic cylinder are fixedly connected to the upper side of the feeding hopper through support rods. A feeding block plate is provided on the lower output end of the feeding hydraulic cylinder. The upper end of the feeding block plate is fixedly connected to the lower output end of the feeding hydraulic cylinder.

[0008] Furthermore, an auxiliary frame is provided at the lower front end of the unloading platform. The left and right ends of the auxiliary frame are hinged to the left and right ends of the front side of the unloading platform. A front auxiliary leveling roller is provided at the front side of the auxiliary frame. The left and right ends of the front auxiliary leveling roller are movably connected to the left and right ends of the front side of the auxiliary frame through bearings. A leveling roller motor is provided on the left side of the front auxiliary leveling roller. The right end of the leveling roller motor is fixedly connected to the left side of the auxiliary frame. The right output end of the leveling roller motor is connected to the left end of the front auxiliary leveling roller through a coupling for transmission.

[0009] Furthermore, the triangular frame is provided with three rear supports, which are evenly distributed in a rectangular array from left to right on the rear side of the triangular frame. The front end of the rear supports is fixedly connected to the rear side of the triangular frame. The rear end of the three rear supports is provided with a rear support rod, which is fixedly connected to the front end of the three rear supports. The rear end of the rear support rod is provided with several sets of support devices, which are evenly distributed in a rectangular array from left to right on the rear end of the rear support rod.

[0010] Furthermore, the support device includes a connecting elbow, the front end of which is fixedly connected to the rear end of the rear support rod. A locking plate is provided on the lower side of the connecting elbow, the upper front end of which is hinged to the lower side of the connecting elbow. A supporting rubber leg is provided on the rear side of the locking plate, and the supporting rubber leg is fixed to the rear side of the locking plate by a pair of U-shaped locks.

[0011] Furthermore, a linkage plate is provided at the lower front end of the locking plate, and the rear side of the linkage plate is fixedly connected to the lower front end of all the locking plates. A telescopic cylinder is provided in the middle of the front side of the linkage plate, and the front end of the telescopic cylinder is hinged to the lower side of the rear bracket. The rear output end of the telescopic cylinder is hinged to the middle of the front side of the linkage plate.

[0012] Beneficial effects: The cement scraper structure in the triangular frame can scrape off the cement particles adhering to the main leveling rollers 1 and 2. A material feeding platform is set on the front side of the triangular frame, through which cement can be dropped to the ground through the feeding hopper on the feeding platform. The main leveling rollers 1 and 2 are used to compact the cement, thereby repairing the road surface depressions. This solves the problem of existing leveling rollers adhering to concrete particles and reduces the limitations of manual repair of road surface depressions, as well as the problem of insufficient compaction. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 1 ;

[0014] Figure 2 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 2 ;

[0015] Figure 3 This is a schematic diagram of the right-side structure of this utility model;

[0016] Figure label:

[0017] 1. Triangular frame, 2. Bottom frame, 3. Unloading platform, 4. Middle plate, 5. Sliding groove, 6. Roller groove, 7. Unloading bin, 8. Unloading cylinder, 9. Micro motor, 10. Adjusting screw, 11. Auxiliary frame, 12. Front auxiliary leveling roller, 13. Rear support, 14. Connecting elbow, 15. Rear support rod, 16. Locking plate, 17. Supporting rubber leg, 18. Linkage plate, 19. Leveling roller motor, 20. Adjusting bolt, 21. Locking spring, 22. Fixed frame, 23. Cement scraper, 24. Double-headed hydraulic cylinder, 25. Main leveling roller one, 26. Main leveling roller two, 27. Telescopic cylinder, 28. Front support arm, 29. Support roller, 30. Unloading hydraulic cylinder, 31. Unloading blocking plate. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] Reference Figure 1-3A concrete road surface leveling device includes a triangular frame 1, a bottom frame 2, a material feeding platform 3, a middle plate 4, a sliding groove 5, a roller groove 6, a material feeding bin 7, a material feeding cylinder 8, a micro motor 9, an adjusting screw 10, an auxiliary frame 11, a front auxiliary leveling roller 12, a rear support 13, a connecting elbow 14, a rear support rod 15, a locking plate 16, supporting rubber legs 17, a linkage plate 18, a leveling roller motor 19, an adjusting bolt 20, a locking spring 21, a fixed frame 22, a cement scraper 23, a double-headed hydraulic cylinder 24, a first main leveling roller 25, a second main leveling roller 26, a telescopic cylinder 27, a front support arm 28, a supporting roller 29, a material feeding hydraulic cylinder 30, and a material feeding blocking plate 31. The bottom frame 2 has a triangular frame 1 at its upper end. The lower end of frame 1 is fixedly connected to the upper end of bottom frame 2. A middle plate 4 is provided in the middle of the triangular frame 1. The front and rear ends of the middle plate 4 are fixedly connected to the inner side of the triangular frame 1. Three adjusting bolts 20 are provided on the middle plate 4, evenly distributed in a rectangular array from left to right. Each adjusting bolt 20 has a thread in its middle, and the middle part of each adjusting bolt 20 is connected to the middle plate 4 via the thread. A fixed frame 22 is provided on the lower side of the middle plate 4. The lower end of each adjusting bolt 20 is connected to the upper end of the fixed frame 22 via a rotating bearing. A locking spring 21 is provided between the middle plate 4 and the fixed frame 22, and the locking spring 21 is sleeved on the adjusting bolt 20. The fixed frame 22 is symmetrically arranged front and rear. There is a pair of cement scrapers 23. The left and right ends of the inner sides of the pair of cement scrapers 23 are hinged to the front and rear ends of the fixed frame 22. A double-headed hydraulic cylinder 24 is provided on the lower side of the fixed frame 22. The upper end of the double-headed hydraulic cylinder 24 is fixedly connected to the lower side of the fixed frame 22. The output ends of the double-headed hydraulic cylinder 24 on both the front and rear sides are hinged to the lower middle of the pair of cement scrapers 23. A main leveling roller 26 and a main leveling roller 25 are symmetrically arranged in the bottom frame 2. The left and right ends of the main leveling roller 26 and the main leveling roller 25 are connected to the bottom frame 2 through rotating bearings. A leveling roller motor 19 is provided on the left end of the main leveling roller 26 and the main leveling roller 25. The right side of the leveling roller motor 19 is fixedly connected to the left end of the bottom frame 2. The output ends on the right side of the bottom frame 2 are connected to the left ends of the main leveling roller 26 and the main leveling roller 25 via couplings for transmission. A feeding platform 3 is provided on the front side of the bottom frame 2. The lower rear end of the feeding platform 3 is fixedly connected to the front end of the bottom frame 2. A sliding groove 5 is provided on the upper end of the feeding platform 3, and a feeding cylinder 8 is provided in the sliding groove 5. A roller groove 6 is provided on the front side of the sliding groove 5. An adjusting screw 10 is provided on the rear side of the feeding cylinder 8. The left and right ends of the adjusting screw 10 are connected to the upper side of the feeding platform 3 via rotating bearings and bearing seats. A micro motor 9 is provided on the right side of the adjusting screw 10. The left end of the micro motor 9 is fixedly connected to the right side of the feeding platform 3. The output end of the micro motor 9 on the left side is connected to the right end of the adjusting screw 10 via a coupling for transmission.The rear end of the feeding cylinder 8 is threadedly connected to the adjusting screw 10. The front end of the feeding cylinder 8 is provided with a front support arm 28, the inner end of which is fixedly connected to the front end of the feeding cylinder 8. A support roller 29 is provided on the lower side of the front support arm 28, and the support roller 29 is movably connected to the lower side of the front support arm 28 via a pin. The bottom of the support roller 29 is engaged in a roller groove 6. A feeding bin 7 is provided at the upper end of the feeding cylinder 8, and the lower end of the feeding bin 7 is fixedly connected to and communicates with the upper end of the feeding cylinder 8.

[0021] The upper side of the feeding bin 7 is provided with a feeding hydraulic cylinder 30. The four ends of the feeding hydraulic cylinder 30 are fixedly connected to the upper side of the feeding bin 7 through support rods. The lower output end of the feeding hydraulic cylinder 30 is provided with a feeding blocking plate 31. The upper end of the feeding blocking plate 31 is fixedly connected to the lower output end of the feeding hydraulic cylinder 30.

[0022] The lower front end of the unloading platform 3 is provided with an auxiliary frame 11. The left and right ends of the auxiliary frame 11 are hinged to the left and right ends of the front side of the unloading platform 3. The front auxiliary leveling roller 12 is provided on the front side of the auxiliary frame 11. The left and right ends of the front auxiliary leveling roller 12 are movably connected to the left and right ends of the front side of the auxiliary frame 11 through bearings. The left side of the front auxiliary leveling roller 12 is provided with a leveling roller motor 19. The right end of the leveling roller motor 19 is fixedly connected to the left side of the auxiliary frame 11. The right output end of the leveling roller motor 19 is connected to the left end of the front auxiliary leveling roller 12 through a coupling for transmission.

[0023] The triangular frame 1 has three rear supports 13 on its rear side. The three rear supports 13 are evenly distributed in a rectangular array from left to right on the rear side of the triangular frame 1. The front end of the rear supports 13 is fixedly connected to the rear side of the triangular frame 1. The rear end of the three rear supports 13 is provided with a rear support rod 15. The front side of the rear support rod 15 is fixedly connected to the rear end of the three rear supports 13. The rear end of the rear support rod 15 is provided with several sets of support devices. The several sets of support devices are evenly distributed in a rectangular array from left to right on the rear end of the rear support rod 15.

[0024] The support device includes a connecting elbow 14, the front end of which is fixedly connected to the rear end of the rear support rod 15. A locking plate 16 is provided on the lower side of the connecting elbow 14. The upper front end of the locking plate 16 is hinged to the lower side of the connecting elbow 14. A supporting rubber leg 17 is provided on the rear side of the locking plate 16. The supporting rubber leg 17 is fixed to the rear side of the locking plate 16 by a pair of U-shaped locks.

[0025] The lower front end of the locking plate 16 is provided with a linkage plate 18. The rear side of the linkage plate 18 is fixedly connected to the lower front end of all the locking plates 16. The middle front side of the linkage plate 18 is provided with a telescopic cylinder 27. The front end of the telescopic cylinder 27 is hinged to the lower side of the rear bracket 13, and the rear output end of the telescopic cylinder 27 is hinged to the middle front side of the linkage plate 18.

[0026] Working principle:

[0027] Rotate the adjusting bolt 20 to move the fixed frame 22 downward and extend the double-headed hydraulic cylinder 24 outward until the outer ends of the pair of cement scrapers 23 abut against the cylindrical sides of the main leveling roller 1 25 and the main leveling roller 26. When the leveling roller 1 and the main leveling roller 26 level the road surface, the pair of cement scrapers 23 can scrape off the cement particles adhering to the main leveling roller 1 25 and the main leveling roller 26.

[0028] The hydraulic cylinder 30 on the upper side of the feeding bin 7 can control the feeding block plate 31 on its lower side to move up and down, thereby controlling the falling of cement used for repair inside the feeding bin 7. When it is necessary to repair the road surface depression, the feeding cylinder 8 is moved by the micro motor 9 and the lead screw until it is above the position to be repaired. The hydraulic cylinder 30 controls the feeding block plate 31 to move up, and the cement in the feeding bin 7 falls. Then the leveling roller 1 and the main leveling roller 26 move forward to compact the cement and complete the repair work of the road surface depression.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A road concrete finishing device, characterized by: Includes a triangular frame (1), a bottom frame (2), a feeding platform (3), a middle plate (4), a sliding groove (5), a roller groove (6), a feeding bin (7), a feeding cylinder (8), a micro motor (9), an adjusting screw (10), an auxiliary frame (11), a front auxiliary leveling roller (12), a rear support (13), a connecting elbow (14), a rear support rod (15), a locking plate (16), a supporting rubber leg (17), a linkage plate (18), a leveling roller motor (19), an adjusting bolt (20), a locking spring (21), a fixed frame (22), a cement scraper (23), a double-headed hydraulic cylinder (24), a main leveling roller one (25), a main leveling roller two (26), a telescopic cylinder (27), a front support arm (28), and a support roller. The bottom frame (2) has a wheel (29), a feeding hydraulic cylinder (30), and a feeding blocking plate (31). A triangular frame (1) is provided at the upper end of the bottom frame (2). The lower end of the triangular frame (1) is fixedly connected to the upper end of the bottom frame (2). A middle plate (4) is provided in the middle of the triangular frame (1). The front and rear ends of the middle plate (4) are fixedly connected to the inner side of the triangular frame (1). Three adjusting bolts (20) are provided on the middle plate (4). The three adjusting bolts (20) are evenly distributed in a rectangular array from left to right on the middle plate (4). The middle of each adjusting bolt (20) has a thread, and the middle of each adjusting bolt (20) is connected to the middle plate (4) through the thread. A fixing frame (22) is provided on the lower side of the middle plate (4). The lower end of the bolt (20) is connected to the upper end of the fixed frame (22) through a rotating bearing. A locking spring (21) is provided between the intermediate plate (4) and the fixed frame (22). The locking spring (21) is sleeved on the adjusting bolt (20). A pair of cement scrapers (23) are symmetrically arranged at the front and back of the fixed frame (22). The left and right ends of the inner side of the pair of cement scrapers (23) are hinged to the front and rear ends of the fixed frame (22). A double-headed hydraulic cylinder (24) is provided on the lower side of the fixed frame (22). The upper end of the double-headed hydraulic cylinder (24) is fixedly connected to the lower side of the fixed frame (22). The output ends of the double-headed hydraulic cylinder (24) on both the front and back sides are hinged to the middle of the lower side of the pair of cement scrapers (23). The bottom frame (2) is symmetrically arranged at the front and back. The main leveling roller 2 (26) and the main leveling roller 1 (25) are connected to the bottom frame (2) at both ends via rotating bearings. A leveling roller motor (19) is provided at the left end of each of the main leveling rollers 2 (26) and the main leveling roller 1 (25). The right side of the leveling roller motor (19) is fixedly connected to the left end of the bottom frame (2). The right output end of the leveling roller motor (19) is connected to the left end of the main leveling roller 2 (26) and the main leveling roller 1 (25) via a coupling for transmission. A feeding platform (3) is provided at the front of the bottom frame (2). The lower rear end of the feeding platform (3) is fixedly connected to the front end of the bottom frame (2). A sliding groove (5) is provided at the upper end of the feeding platform (3).The sliding groove (5) is provided with a feeding cylinder (8). The front side of the sliding groove (5) has a roller groove (6). The rear side of the feeding cylinder (8) is provided with an adjusting screw (10). The left and right ends of the adjusting screw (10) are connected to the upper side of the feeding platform (3) through rotating bearings and bearing seats. The right side of the adjusting screw (10) is provided with a micro motor (9). The left end of the micro motor (9) is fixedly connected to the right side of the feeding platform (3). The left output end of the micro motor (9) is connected to the right end of the adjusting screw (10) through a coupling for transmission. The feeding cylinder (8) The rear end is connected to the adjusting screw (10) by a thread. The front end of the feeding cylinder (8) is provided with a front support arm (28). The inner end of the front support arm (28) is fixedly connected to the front end of the feeding cylinder (8). The lower side of the front support arm (28) is provided with a support roller (29). The support roller (29) is movably connected to the lower side of the front support arm (28) by a pin. The bottom of the support roller (29) is stuck in the roller groove (6). The upper end of the feeding cylinder (8) is provided with a feeding bin (7). The lower end of the feeding bin (7) is fixed and connected to the upper end of the feeding cylinder (8).

2. A road concrete finishing device according to claim 1, characterized in that: The upper side of the feeding bin (7) is provided with a feeding hydraulic cylinder (30). The four ends of the feeding hydraulic cylinder (30) are fixedly connected to the upper side of the feeding bin (7) through support rods. The lower output end of the feeding hydraulic cylinder (30) is provided with a feeding block plate (31). The upper end of the feeding block plate (31) is fixedly connected to the lower output end of the feeding hydraulic cylinder (30).

3. A road concrete finishing device according to claim 1, characterized in that: The lower front end of the unloading platform (3) is provided with an auxiliary frame (11). The left and right ends of the auxiliary frame (11) are hinged to the left and right ends of the front side of the unloading platform (3). The front auxiliary leveling roller (12) is provided on the front side of the auxiliary frame (11). The left and right ends of the front auxiliary leveling roller (12) are movably connected to the left and right ends of the front side of the auxiliary frame (11) through bearings. The left side of the front auxiliary leveling roller (12) is provided with a leveling roller motor (19). The right end of the leveling roller motor (19) is fixedly connected to the left side of the auxiliary frame (11). The right output end of the leveling roller motor (19) is connected to the left end of the front auxiliary leveling roller (12) through a coupling for transmission.

4. The road concrete finishing device according to claim 1, characterized in that: The triangular frame (1) is provided with three rear supports (13) on the rear side. The three rear supports (13) are evenly distributed in a rectangular array from left to right on the rear side of the triangular frame (1). The front end of the rear supports (13) is fixedly connected to the rear side of the triangular frame (1). The rear end of the three rear supports (13) is provided with a rear support rod (15). The front side of the rear support rod (15) is fixedly connected to the rear end of the three rear supports (13). The rear end of the rear support rod (15) is provided with several sets of support devices. The several sets of support devices are evenly distributed in a rectangular array from left to right on the rear end of the rear support rod (15).

5. A road surfacing concrete screeding device according to claim 4, wherein: The support device includes a connecting elbow (14), the front end of which is fixedly connected to the rear end of the rear support rod (15). A locking plate (16) is provided on the lower side of the connecting elbow (14). The upper front end of the locking plate (16) is hinged to the lower side of the connecting elbow (14). A supporting rubber leg (17) is provided on the rear side of the locking plate (16). The supporting rubber leg (17) is fixed to the rear side of the locking plate (16) by a pair of U-shaped locks.

6. A road concrete finishing device according to claim 1, characterized in that: The lower front end of the locking plate (16) is provided with a linkage plate (18). The rear side of the linkage plate (18) is fixedly connected to the lower front end of all the locking plates (16). The middle front side of the linkage plate (18) is provided with a telescopic cylinder (27). The front end of the telescopic cylinder (27) is hinged to the lower side of the rear bracket (13). The rear output end of the telescopic cylinder (27) is hinged to the middle front side of the linkage plate (18).