A joint cutting device for road and bridge engineering

Abstract

The utility model relates to road and bridge construction technical field, concretely is a kind of road and bridge engineering with joint cutting device, including the installation box of fixed installation in the top of vehicle body, the side of installation box close to drive arrangement is rotatably provided with driving shaft, the side of installation box away from driving shaft is rotatably provided with driven shaft, and overload separation mechanism is arranged between driving shaft and driven shaft, and the meshing transmission assembly for allowing driving shaft to drive driven shaft to rotate is arranged on overload separation mechanism, and overload separation mechanism is arranged in the inside of installation box;By setting overload separation mechanism and meshing transmission assembly, when saw blade cuts into hard material or is stuck by concrete chip, overload separation mechanism can quickly detect resistance change and separate driving shaft and driven shaft when saw blade is stuck, avoid the damage of device due to excessive load, after separation, it can promote driven shaft and saw blade reverse rotation and small amplitude shaking, and the outward thrust generated by reverse rotation can push out the obstacle that saw blade is stuck, realize automatic escape.

Description

Technical Field

[0001] This utility model relates to the field of road and bridge construction technology, and in particular to a cutting device for road and bridge engineering. Background Technology

[0002] Road and bridge engineering joint cutting devices are specialized equipment used for cutting joints on road surfaces or bridge decks. Their main function is to cut expansion joints of a predetermined depth on hardened cement concrete or asphalt pavement using cutting tools to prevent irregular cracks from forming on the pavement due to temperature changes.

[0003] An adjustable kerfing device is disclosed in Chinese Patent Publication No. CN220079678U. This adjustable kerfing device uses a motor to drive a cutting blade to rotate, and the rotating cutting blade completes the corresponding kerfing operation. However, according to kerfing devices provided in related fields and existing technologies, firstly, traditional kerfing devices mostly use a rigid transmission structure. When the saw blade gets stuck due to cutting into hard objects or uneven concrete strength, the motor output torque will be instantly transmitted to the saw blade and drive shaft, causing the motor to overload and burn out, the transmission gears to break, or the drive shaft to twist and deform. Secondly, when the saw blade gets stuck, operators often use hard methods such as dragging the equipment, prying the saw blade, or rotating the motor in reverse to try to pull the saw blade out of the kerf. At this time, the saw blade is subjected to axial tension and the extrusion pressure of the concrete on both sides of the kerf. It is very easy for the saw blade base to break due to stress concentration. If the broken saw blade cannot be completely removed, the remaining metal fragments may rust and expand during subsequent road use, causing cracks to spread at the kerf and affecting the road durability. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art, solve the problems mentioned in the background art, and provide a cutting device for road and bridge engineering.

[0005] The objective of this utility model is achieved through the following technical solution: a cutting device for road and bridge engineering, comprising a vehicle body and a drive device and control box fixedly installed on the top of the vehicle body. The vehicle body is provided with a jacking mechanism for controlling the tilting of its front side, and also includes a mounting box fixedly installed on the top of the vehicle body. The mounting box has a drive shaft rotatably mounted on the side near the drive device, and a driven shaft rotatably mounted on the side of the mounting box away from the drive shaft. An overload separation mechanism is provided between the drive shaft and the driven shaft. The overload separation mechanism is provided with a meshing transmission assembly for allowing the drive shaft to drive the driven shaft to rotate. The overload separation mechanism is located inside the mounting box. A saw blade is mounted on the driven shaft on the outside of the mounting box. The saw blade is located on the outside of the vehicle body. A protective cover is fixedly mounted on the side of the mounting box near the saw blade. The output end of the drive device is connected to the drive shaft through a coupling.

[0006] Preferably, the overload separation mechanism includes a first fixed plate, a splined shaft, a second fixed plate, a third fixed plate, and a support plate rotatably disposed inside the mounting box. The first fixed plate is fixedly connected to the driven shaft, the splined shaft is fixedly connected to the driving shaft, the second fixed plate is rotatably connected to the driven shaft, the third fixed plate is splinedly connected to the splined shaft, and the support plate is fixedly connected to the splined shaft. A first elastic element is provided between the third fixed plate and the support plate. A plurality of bearing blocks are fixedly arranged at equal intervals on the side of the first fixed plate facing the second fixed plate. Movable grooves are fixedly provided on the second fixed plate at the positions corresponding to the plurality of bearing blocks. A second elastic element is fixedly provided between the bearing blocks and the movable grooves.

[0007] Preferably, the meshing transmission assembly includes a plurality of meshing blocks fixedly disposed on the end face of the third fixed disk. The number of meshing blocks is the same as the number of bearing blocks. Each bearing block has a meshing groove adapted to the position of the meshing block.

[0008] Preferably, the cross-sectional shape of the bearing block is arc-shaped, and the movable groove is an arc-shaped groove.

[0009] Preferably, a toothed plate is fixedly provided on the side of the movable groove away from the first fixed plate, the toothed plate is arc-shaped, and the teeth of the toothed plate face the third fixed plate.

[0010] Preferably, the side of the meshing block away from the third fixed plate is an arc surface, and the meshing groove is an arc-shaped groove.

[0011] Preferably, a cover is fixedly installed on the top of the mounting box, and a first rotating hole is provided in the mounting box corresponding to the positions of the drive shaft and the driven shaft. The drive shaft and the driven shaft are connected to the first rotating hole through bearings.

[0012] Preferably, the second fixed plate has a second rotating hole corresponding to the position of the driven shaft, and a bearing is embedded inside the second rotating hole, and the driven shaft is inserted into the bearing.

[0013] The beneficial effects of this cutting device for road and bridge engineering are as follows: By setting up an overload separation mechanism and a meshing transmission assembly, when the saw blade cuts into hard objects or gets stuck by concrete debris, the overload separation mechanism can quickly detect changes in resistance and separate the drive shaft and driven shaft when the saw blade is stuck, thus preventing damage to the device due to excessive load. At the same time, after separation, it can cause the driven shaft and saw blade to rotate in opposite directions and vibrate slightly. The outward thrust generated by the reverse rotation can push out the obstacle stuck on the saw blade, achieving automatic extrication and reducing the time for manual downtime for cleaning. Furthermore, the high-frequency, small-amplitude vibration generated by the driven shaft and saw blade loosens the concrete debris or obstacles around the saw blade, further improving the success rate of extrication. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a structural schematic diagram of the vehicle body from a first-view perspective when the present invention is cutting a slit;

[0017] Figure 3 This is a structural schematic diagram of the vehicle body from a second perspective when the slit is being cut according to this utility model;

[0018] Figure 4 This is a schematic diagram of the installation box of this utility model;

[0019] Figure 5 This is a schematic diagram of the internal structure of the mounting box of this utility model;

[0020] Figure 6 This is a schematic diagram showing the state when the driving shaft and driven shaft of this utility model are engaged;

[0021] Figure 7 This is a schematic diagram showing the state when the driving shaft and driven shaft of this utility model are separated;

[0022] Figure 8 This is a schematic diagram of the meshing block of this utility model;

[0023] Figure 9 This is a schematic diagram of the structure of the bearing block of this utility model;

[0024] Figure 10 This is a schematic diagram of the disassembled structure of the second fixed disk and the driven shaft of this utility model;

[0025] Figure 11 This is a schematic diagram of the second elastic element of this utility model when it is not compressed;

[0026] Figure 12 This is a schematic diagram of the state of the second elastic element of this utility model when it is compressed.

[0027] In the diagram: 1. Vehicle body; 2. Mounting box; 3. Drive shaft; 4. Driven shaft; 5. Saw blade; 6. Coupling; 7. Protective cover; 8. Drive unit; 9. Control box; 10. Pushing mechanism; 11. First fixed plate; 12. Splined shaft; 13. Second fixed plate; 14. Third fixed plate; 15. Support plate; 16. First elastic element; 17. Bearing block; 18. Movable groove; 19. Second elastic element; 20. Meshing block; 21. Meshing groove; 22. Tooth plate; 23. Box cover; 24. First rotating hole; 25. Second rotating hole. Detailed Implementation

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Additional aspects and advantages of this invention will be further set forth in the description which follows in conjunction with the accompanying drawings, and in part will be obvious from the description or may be learned by practice of the invention.

[0030] like Figures 1 to 12As shown, a cutting device for road and bridge engineering includes a vehicle body 1, a mounting box 2, a drive unit 8, and a control box 9 fixedly mounted on the top of the vehicle body 1. The vehicle body 1 is equipped with a jacking mechanism 10 for controlling the tilting of its front side. A drive shaft 3 is rotatably mounted on the side of the mounting box 2 closest to the drive unit 8, and a driven shaft 4 is rotatably mounted on the side of the mounting box 2 away from the drive shaft 3. A box cover 23 is fixedly mounted on the top of the mounting box 2. First rotating holes 24 are provided in the mounting box 2 corresponding to the positions of the drive shaft 3 and the driven shaft 4. Both the drive shaft 3 and the driven shaft 4 are connected to the first rotating holes 24 via bearings. The aforementioned bearings can reduce the frictional force when the drive shaft 3 and driven shaft 4 rotate, and improve the stability of the drive shaft 3 and driven shaft 4 when rotating. An overload separation mechanism is provided between the drive shaft 3 and driven shaft 4. The overload separation mechanism is equipped with a meshing transmission component for the drive shaft 3 to drive the driven shaft 4 to rotate. The overload separation mechanism is located inside the mounting box 2. A saw blade 5 is installed on the outside of the driven shaft 4 located on the mounting box 2. The saw blade 5 is located on the outside of the vehicle body 1. A protective cover 7 is fixedly installed on the side of the mounting box 2 near the saw blade 5. The output end of the drive device 8 is connected to the drive shaft 3 through a coupling 6.

[0031] The overload separation mechanism includes a first fixed plate 11, a splined shaft 12, a second fixed plate 13, a third fixed plate 14, and a support plate 15, all rotatably disposed inside the mounting box 2. The first fixed plate 11 is fixedly connected to the driven shaft 4, the splined shaft 12 is fixedly connected to the driving shaft 3, and the second fixed plate 13 is rotatably connected to the driven shaft 4. A second rotating hole 25 is provided on the second fixed plate 13 corresponding to the position of the driven shaft 4. A bearing is embedded inside the second rotating hole 25, and the driven shaft 4 is inserted into the bearing. Using the aforementioned bearing, the second fixed plate 13 can rotate independently, allowing the driven shaft 4 to be separated from the driven shaft 4. The moving shaft 4 cannot drive the second fixed disk 13 to rotate. The third fixed disk 14 is splinedly connected to the spline shaft 12. The support disk 15 is fixedly connected to the spline shaft 12. A first elastic element 16 is provided between the third fixed disk 14 and the support disk 15. Multiple bearing blocks 17 are fixedly provided at equal intervals on the side of the first fixed disk 11 facing the second fixed disk 13. Movable grooves 18 are fixedly provided on the second fixed disk 13 at the positions of the multiple bearing blocks 17. The cross-sectional shape of the bearing block 17 is arc-shaped. The movable groove 18 is an arc-shaped groove. A second elastic element 19 is fixedly provided between the bearing block 17 and the movable groove 18.

[0032] The meshing transmission assembly includes multiple meshing blocks 20 fixedly mounted on the end face of the third fixed plate 14. The number of meshing blocks 20 is the same as the number of bearing blocks 17. The bearing blocks 17 have meshing grooves 21 that are adapted to the positions of the meshing blocks 20. The side of the meshing block 20 away from the third fixed plate 14 is an arc surface, and the meshing groove 21 is an arc-shaped groove. When the saw blade 5 cuts into a hard object or gets stuck by concrete debris, the overload separation mechanism can quickly detect the change in resistance and separate the drive shaft 3 from the driven shaft 4 when the saw blade 5 is stuck. This prevents the drive device 8 from burning out due to excessive load, and at the same time prevents rigid components such as the saw blade 5 and the drive shaft 3 from breaking or deforming due to excessive instantaneous torque, thereby reducing the equipment failure rate and maintenance costs.

[0033] A toothed plate 22 is fixedly provided on the side of the movable groove 18 away from the first fixed plate 11. The toothed plate 22 is arc-shaped, and the teeth of the toothed plate 22 face the third fixed plate 14. When the meshing block 20 disengages from the meshing groove 21, the meshing block 20 will contact the toothed plate 22. At this time, the drive shaft 3 and the third fixed plate 14 rotate independently. The elastic force of the second elastic element 19 restores the first fixed plate 11, the driven shaft 4 and the saw blade 5 to rotate in opposite directions. When the meshing block 20 contacts the toothed plate 22, it will cause the first fixed plate 11, the driven shaft 4 and the saw blade 5 to vibrate slightly.

[0034] The work process is as follows:

[0035] S1: As Figure 1 , Figure 3 , Figure 6 , Figure 8 , Figure 9 and Figure 10 As shown, when in use, the drive device 8 is started, so that the drive device 8 controls the rotation of the drive shaft 3 through the coupling 6. Then the drive shaft 3 will drive the spline shaft 12, the third fixed disk 14 and the support disk 15 to rotate (since the third fixed disk 14 is splinedly connected to the spline shaft 12, the third fixed disk 14 can rotate synchronously with the spline shaft 12). At this time, by utilizing the cooperation between the meshing block 20 and the bearing block 17, the third fixed disk 14 can drive the first fixed disk 11 and the driven shaft 4 to rotate.

[0036] S2: As Figure 1 , Figure 3 , Figure 6 , Figure 8 , Figure 9 and Figure 10 As shown, when the driven shaft 4 rotates, the saw blade 5 will rotate accordingly. At this time, the front side of the vehicle body 1 can be moved downward by the push mechanism 10, so that the saw blade 5 contacts the road surface, and then the saw blade 5 is used to cut the road surface.

[0037] S3: As Figure 1 , Figure 3 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, when the saw blade 5 cuts into a hard object or gets stuck in concrete debris, the meshing block 20 and the meshing groove 21 are in arc contact, which can detect the resistance. When the resistance is large, the meshing block 20 will disengage from the meshing groove 21, thereby causing the third fixed plate 14 to slide axially on the outer surface of the spline shaft 12 and compress the first elastic element 16. During the disengagement process, the bearing block 17 will slide inside the movable groove 18, thereby compressing the second elastic element 19.

[0038] S4: As Figures 6 to 12 As shown, when the meshing block 20 disengages from the meshing groove 21, the meshing block 20 will contact the toothed plate 22. At this time, the drive shaft 3 and the third fixed plate 14 rotate independently. The elastic force of the second elastic element 19 restores the first fixed plate 11, the driven shaft 4 and the saw blade 5 to rotate in the opposite direction. When the meshing block 20 contacts the toothed plate 22, it will cause the first fixed plate 11, the driven shaft 4 and the saw blade 5 to vibrate slightly.

[0039] S5: In summary, when the saw blade 5 cuts into a hard object or gets stuck in concrete debris, the overload separation mechanism can quickly detect changes in resistance and separate the drive shaft 3 from the driven shaft 4 when the saw blade 5 is stuck. This prevents the drive unit 8 from burning out due to excessive load, and also prevents rigid components such as the saw blade 5 and drive shaft 3 from breaking or deforming due to excessive instantaneous torque. This reduces the equipment failure rate and maintenance costs. After overload separation, when the drive shaft 3 rotates alone, the driven shaft 4 and the saw blade 5 rotate in opposite directions and vibrate slightly. The outward thrust generated by the reverse rotation can push out the obstacle that is stuck in the saw blade 5, achieving automatic escape and reducing the time for manual downtime cleaning. Furthermore, the driven shaft 4 and the saw blade generate high-frequency small vibrations, which loosen the concrete debris or obstacles around the saw blade 5 through vibration, further improving the success rate of escape.

[0040] S6: The overload separation mechanism can automatically re-engage the drive shaft 3 and the driven shaft 4 after being freed from the entrapment, ensuring the continuity of the cutting process.

[0041] The drive device 8, control box 9, and jacking mechanism 10 described in this application are all known technologies in this field, and therefore their specific structures and working principles are not described in detail.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A cutting device for road and bridge engineering, comprising a vehicle body (1) and a drive device (8) and a control box (9) fixedly installed on the top of the vehicle body (1), wherein the vehicle body (1) is provided with a jacking mechanism (10) for controlling the tilting of its front side, characterized in that: It also includes a mounting box (2) fixedly installed on the top of the vehicle body (1). The mounting box (2) has a drive shaft (3) rotatably mounted on the side close to the drive device (8), and a driven shaft (4) rotatably mounted on the side away from the drive shaft (3). An overload separation mechanism is provided between the drive shaft (3) and the driven shaft (4). The overload separation mechanism is provided with a meshing transmission assembly for driving the driven shaft (4) to rotate by the drive shaft (3). The overload separation mechanism is located inside the mounting box (2). The driven shaft (4) is located on the outside of the mounting box (2) and a saw blade (5) is mounted thereon. The saw blade (5) is located on the outside of the vehicle body (1). A protective cover (7) is fixedly mounted on the side of the mounting box (2) near the saw blade (5). The output end of the drive device (8) is connected to the drive shaft (3) through a coupling (6).

2. The cutting device for road and bridge engineering according to claim 1, characterized in that: The overload separation mechanism includes a first fixed plate (11), a splined shaft (12), a second fixed plate (13), a third fixed plate (14), and a support plate (15) rotatably disposed inside the mounting box (2). The first fixed plate (11) is fixedly connected to the driven shaft (4), the splined shaft (12) is fixedly connected to the driving shaft (3), the second fixed plate (13) is rotatably connected to the driven shaft (4), and the third fixed plate (14) is splinedly connected to the splined shaft (12). The support plate (15) is rotatably connected to the driven shaft (4). The support plate (15) is fixedly connected to the spline shaft (12). A first elastic element (16) is provided between the third fixed plate (14) and the support plate (15). A plurality of bearing blocks (17) are fixedly provided at equal intervals on the side of the first fixed plate (11) facing the second fixed plate (13). A movable groove (18) is fixedly provided on the second fixed plate (13) at the position corresponding to the plurality of bearing blocks (17). A second elastic element (19) is fixedly provided between the bearing block (17) and the movable groove (18).

3. A cutting device for road and bridge engineering according to claim 2, characterized in that: The meshing transmission assembly includes a plurality of meshing blocks (20) fixedly disposed on the end face of the third fixed disk (14). The number of meshing blocks (20) is the same as the number of bearing blocks (17). The bearing blocks (17) are provided with meshing grooves (21) that are adapted to the positions of the meshing blocks (20).

4. A cutting device for road and bridge engineering according to claim 3, characterized in that: The cross-sectional shape of the bearing block (17) is arc-shaped, and the movable groove (18) is an arc-shaped groove.

5. A cutting device for road and bridge engineering according to claim 4, characterized in that: A toothed plate (22) is fixedly provided on the side of the movable groove (18) away from the first fixed plate (11). The toothed plate (22) is arc-shaped, and the teeth of the toothed plate (22) face the third fixed plate (14).

6. A cutting device for road and bridge engineering according to claim 5, characterized in that: The side of the meshing block (20) away from the third fixed plate (14) is an arc surface, and the meshing groove (21) is an arc-shaped groove.

7. A cutting device for road and bridge engineering according to claim 1, characterized in that: The top of the mounting box (2) is fixedly installed with a box cover (23). The mounting box (2) has a first rotating hole (24) at the position corresponding to the position of the drive shaft (3) and the driven shaft (4). The drive shaft (3) and the driven shaft (4) are connected to the first rotating hole (24) through bearings.

8. A cutting device for road and bridge engineering according to claim 2, characterized in that: The second fixed plate (13) has a second rotating hole (25) at the position corresponding to the driven shaft (4). A bearing is embedded inside the second rotating hole (25), and the driven shaft (4) is inserted into the bearing.

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