Road roller front wheel driving mechanism suitable for sand construction

Abstract

The invention relates to a front wheel driving mechanism of a road roller adapted to sand construction, which comprises a frame (1) of the road roller and a front wheel (5) rotatably mounted on the frame (1), a track driving wheel (6) is arranged on the outer ring of the front wheel (5), and a lifting type support chain wheel (3) and a track tensioning wheel (7) are respectively mounted on the frame (1) on the front side and the rear side of the front wheel (5); the outer rings of the supporting chain wheels (3), the tensioning wheels (7) and the front wheels (5) are connected with a crawler belt (4) in a wrapping mode, and the front wheels (5) drive the crawler belt driving wheels (6) to rotate so as to drive the crawler belt (4) to advance. According to the invention, the front wheel distribution mass of the road roller is not changed, main compaction parameters such as the weight of the whole road roller and the like do not need to be reduced, the compaction capability of the road roller is ensured, the large-tonnage single-drum vibratory road roller can be used for sand construction, the working efficiency during sand construction is improved, and meanwhile, the construction of the road roller in other regions is not influenced.

Description

Technical Field

[0001] The invention relates to a front wheel driving mechanism of a road roller suitable for sandy land construction, belonging to the technical field of road rollers. Background Art

[0002] Large-tonnage single-wheel vibratory rollers often face the following problems when performing compaction work on sand: Problem 1: The sand is soft and the front wheels are sunk into the sand. The roller has great resistance when driving and may even be unable to drive normally.

[0003] Problem 2: The surface of the front wheel is polished smooth by the sand and is prone to slipping, causing the roller's hydraulic drive system to lose driving force.

[0004] To solve the above problems, the existing solutions are: 1. Reduce the weight of the roller and use a small-tonnage roller.

[0005] 2. Change the front and rear mass distribution of the roller, reduce the mass distributed to the front wheels, and distribute more driving force to the rear wheels.

[0006] However, existing solutions bring new problems: 1. Small-tonnage rollers have low overall weight and weak compaction capabilities. The front wheel of a single-wheel roller plays a compaction function, and reducing the front wheel distribution mass will reduce the compaction capability of the roller. If the compaction capability of a single-wheel roller is insufficient, it will be difficult to cope with some construction conditions that require high compaction capability of the roller.

[0007] 2. The tonnage and front and rear wheel mass distribution of the roller are the basic design parameters of the roller. These parameters are difficult to change significantly after the product is manufactured. The roller specially manufactured for compaction construction in sandy areas becomes a customized product and cannot be used normally in other areas.

[0008] Therefore, a front wheel drive mechanism of a road roller suitable for sand construction is needed to achieve the following purposes: 1. Solve the problem of the front wheel sinking a lot in soft sand and causing great driving resistance; 2. Reduce the risk of front wheel skidding on sand, with strong anti-skidding ability; 3. Main compaction parameters such as the front wheel distribution mass of the roller and the weight of the roller do not need to be reduced, thus ensuring the compaction capacity of the roller and the versatility of the roller in construction in different regions. Summary of the invention

[0009] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a front wheel drive mechanism for a roller that can adapt to construction on sandy land, which can effectively prevent the problem of large driving resistance caused by the front wheel sinking in soft sand and prevent the problem of loss of driving force caused by slipping between the front wheel and the sand. It does not change the main compaction parameters such as the front wheel distribution mass of the roller and does not need to reduce the weight of the entire roller, thereby ensuring the compaction capacity of the roller, enabling large-tonnage single-steel-wheel vibratory rollers to be used for construction on sandy land, and improving the work efficiency during construction on sandy land, while not affecting the construction of the roller in other areas.

[0010] The object of the present invention is achieved in that: A front wheel driving mechanism of a road roller suitable for construction on sandy land comprises a frame of the road roller and a front wheel rotatably mounted on the frame, wherein a track driving wheel is arranged on the outer ring of the front wheel, and a lifting type supporting sprocket wheel and a track tensioning wheel are respectively mounted on the frame at the front and rear sides of the front wheel; a track is covered and connected to the outer rings of the supporting sprocket wheel, the tensioning wheel and the front wheel, and the front wheel drives the track driving wheel to rotate and thus drives the track to move forward; The sprocket wheels on the front and rear sides of the front wheel are lowered synchronously, pressing the track to the ground. The sprocket wheels on both sides and the front wheel are in the same horizontal plane, so that the track is in surface contact with the ground. The sprocket wheels on the front and rear sides of the front wheel rise synchronously, and the track is tensioned by the tensioning wheel so that the track only wraps around the bottom of the front wheel to form a linear contact between the track and the ground.

[0011] Furthermore, the supporting sprocket wheel is lifted and lowered by a downward pressure cylinder vertically installed on the frame.

[0012] Furthermore, the tensioning wheel realizes the tensioning action through a tensioning mechanism vertically installed on the frame.

[0013] Furthermore, the tensioning mechanism is a tensioning cylinder or an elastic tensioning device.

[0014] Furthermore, the elastic tensioning device includes a lifting rod vertically slidably arranged on the frame, a limit plate is fixedly installed on the lifting rod, a spring is mounted on the lifting rod between the limit plate and the frame, and a guide column is also provided on the limit plate for guiding through a guide hole of the frame, and the tensioning wheel is arranged on the top of the lifting rod.

[0015] Furthermore, a bidirectional oil cylinder is vertically installed on the frame, and the tension wheel and the supporting chain wheel are respectively installed on the upper and lower ends of the movable lever of the bidirectional oil cylinder.

[0016] Furthermore, the width of the crawler track is greater than the width of the rolling surface of the front wheel, and a plurality of sets of parallel crawler track drive wheels are provided on the outer ring of the front wheel.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention installs a supporting sprocket and a tensioning wheel on the roller frame, and installs a crawler driving wheel and a crawler on the front wheel. By utilizing the rise or fall of the supporting sprocket, the line contact between the front wheel and the ground is changed from the original steel wheel line contact to the crawler surface contact or line contact, thereby changing the contact area between the crawler and the ground. When in surface contact, the sinking of the roller on the sand can be reduced, the driving resistance is reduced, the contact area between the front wheel of the roller and the ground is increased, and the front wheel of the roller is prevented from sinking too much and slipping. When in line contact, the compaction capacity of the roller can be guaranteed while ensuring that the overall weight of the roller and the weight distribution of the front and rear wheels are unchanged, so that a large-tonnage single-steel-wheel vibratory roller can be used in sand construction, thereby improving the work efficiency of sand construction. At the same time, after the supporting sprocket, crawler and crawler driving wheel are disassembled from the front wheel driving mechanism, the roller can be restored to a normal vehicle type, without affecting the construction of the roller in other areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a schematic diagram of the lateral structure of a front wheel drive mechanism of a road roller suitable for construction on sandy land in a line contact state.

[0019] Figure 2 The present invention is a schematic diagram of the lateral structure of a front wheel driving mechanism of a road roller suitable for construction on sandy land in a surface contact state.

[0020] Figure 3 The present invention is a schematic structural diagram of an elastic tensioning device of a front wheel driving mechanism of a road roller suitable for construction on sandy land.

[0021] Figure 4 The present invention is a schematic diagram of the lateral structure of a front wheel drive mechanism of a road roller suitable for construction on sandy land in a line contact state.

[0022] Figure 5 The present invention is a schematic diagram of the lateral structure of a front wheel driving mechanism of a road roller suitable for construction on sandy land in a surface contact state.

[0023] Figure 6 The present invention is a top view of a front wheel driving mechanism of a road roller suitable for sand construction.

[0024] in: Frame 1, two-way oil cylinder 2, sprocket wheel 3, crawler track 4, front wheel 5, crawler track driving wheel 6, tensioning wheel 7, pressing oil cylinder 8, tensioning oil cylinder 9, lifting rod 10, limit plate 11, guide column 12, spring 13. DETAILED DESCRIPTION Example

[0025] See also Figures 1 to 6The present invention relates to a front wheel driving mechanism of a road roller suitable for sand construction, comprising a frame 1 of the road roller, a front wheel 5 rotatably mounted on the frame 1, a track driving wheel 6 being arranged on the outer ring of the front wheel 5, and a lifting type supporting sprocket wheel 3 and a track tensioning wheel 7 being respectively mounted on the frame 1 at the front and rear sides of the front wheel 5; a track 4 is covered and connected to the outer rings of the supporting sprocket wheel 3, the tensioning wheel 7 and the front wheel 5, and the front wheel 5 drives the track driving wheel 6 to rotate and then drives the track 4 to move forward; The width of the crawler 4 is greater than the width of the rolling surface of the front wheel 5, and the contact between the original front wheel 5 and the ground is changed to the crawler 4 contacting the ground. In order to ensure the synchronous movement of the crawler 4 under the overall large width, multiple sets of parallel crawler driving wheels 6 are provided on the outer ring of the front wheel 5, which rotate synchronously with the front wheel 5 to realize the synchronous driving of each width position of the crawler 4; The sprocket wheel 3 is lifted and lowered by a downward pressure cylinder 8 vertically installed on the frame 1, thereby pushing the track 4 up or down; the tensioning wheel 7 is tensioned on the track 4 by a tensioning mechanism vertically installed on the frame 1, and the tensioning mechanism is a tensioning cylinder 9 or an elastic tensioning device; in this embodiment, the elastic tensioning device includes a lifting rod 10 vertically slidably arranged on the frame 1, and a limit plate 11 is fixedly installed on the lifting rod 10, and a spring 13 is mounted on the lifting rod 10 between the limit plate 11 and the frame 1, and a guide column 12 is also provided on the limit plate 11 for guiding through the guide hole of the frame 1, and the tensioning wheel 7 is arranged on the top of the lifting rod 10. Due to the pushing effect of the supporting sprocket wheel 3 on the crawler track 4, the state of the crawler track 4 changes, and the tensioning wheel 7 is required to cooperate with the tensioning of the crawler track 4: when the supporting sprocket wheel 3 rises and the crawler track 4 is loose, the tensioning wheel 7 is pushed outward by the tensioning cylinder 9 or the spring 13 to achieve the tensioning of the crawler track 4; when the supporting sprocket wheel 3 falls and the crawler track 4 is tightened, the tensioning cylinder 9 follows the contraction or the spring 13 is compressed to achieve the automatic tensioning of the crawler track 4; In the initial stage of compaction operation of the roller on the sand, the sand is relatively soft. The sprocket wheel 3 is pushed downward by the downward pressure cylinder 8, and the sprocket wheels 3 on the front and rear sides of the front wheel 5 are synchronously lowered, pressing the crawler track 4 to the ground. The sprocket wheels 3 on both sides and the front wheel 5 are in the same horizontal plane, so that the crawler track 4 forms a surface contact with the ground, and the contact area between the crawler track 4 and the ground is increased, which prevents the front wheel 5 of the roller from sinking too much and slipping; After the sand is compacted to a certain extent and its carrying capacity is improved, the roller needs to increase its compaction capacity to further compact the deep roadbed. The downward pressure cylinder 8 pushes the sprocket wheel 3 to move upward, and the sprocket wheels 3 on the front and rear sides of the front wheel 5 rise synchronously. The tensioning wheel 7 tightens the track 4 so that the track 4 only wraps the bottom of the front wheel 5 to form a linear contact between the track 4 and the ground. The contact area between the track 4 and the ground is reduced, the contact pressure of the front wheel 5 of the roller on the ground becomes larger, the compaction capacity of the roller is enhanced, and the compaction effect is guaranteed.

[0026] The present invention installs a crawler driving wheel 6 and crawler 4 on the front wheel 5 of the roller, and installs a supporting sprocket 3 and a tensioning wheel 7 on the frame 1. By utilizing the rise or fall of the supporting sprocket 3, the line contact between the front wheel 5 and the ground is changed from the original steel front wheel 5 to the surface contact or line contact of the crawler 4, thereby changing the contact area between the crawler 4 and the ground. When in surface contact, the sinking of the roller on the sand can be reduced, the driving resistance is reduced, the contact area between the front wheel 5 of the roller and the ground is increased, and the front wheel 5 of the roller is prevented from sinking too much and slipping. When in line contact, the compaction capacity of the roller can be guaranteed while ensuring that the overall weight of the roller and the weight distribution of the front and rear wheels are unchanged, so that the large-tonnage single steel wheel vibratory roller can be used in sand construction, thereby improving the work efficiency of sand construction. At the same time, after the additional front wheel driving mechanisms such as the supporting sprocket 3, the tensioning wheel 7, the crawler 4, and the crawler driving wheel 6 are disassembled, the roller can be restored to a normal vehicle type without affecting the construction of the roller in other areas. Example

[0027] Referring to the figure, on the basis of Example 1, in order to further simplify the structure, the downward pressure cylinder 8 and the tensioning mechanism that control the movement of the supporting sprocket 3 and the tensioning wheel 7 are replaced by a two-way cylinder 2 vertically installed on the frame 1, and the tensioning wheel 7 and the supporting sprocket 3 are respectively installed at the upper and lower ends of the movable lever of the two-way cylinder 2; the rise and fall of the lever of the two-way cylinder 2 is used to synchronously control the rise and fall of the supporting sprocket 3 and the tensioning wheel 7, so as to realize the downward pressure and rise of the crawler 4 and automatic tensioning.

[0028] In addition: It should be noted that the above specific implementation is only an optimization scheme of this patent. Any changes or improvements made by technicians in this field based on the above concept are within the scope of protection of this patent.

Claims

1. A front wheel drive mechanism for a road roller suitable for construction on sandy land, comprising a frame (1) of the road roller and a front wheel (5) rotatably mounted on the frame (1), characterized in that: The outer ring of the front wheel (5) is provided with a crawler driving wheel (6), and a lifting type sprocket wheel (3) and a crawler tensioning wheel (7) are respectively installed on the frame (1) at the front and rear sides of the front wheel (5); the crawler (4) is covered and connected to the outer rings of the sprocket wheel (3), the tensioning wheel (7) and the front wheel (5), and the crawler driving wheel (6) is driven by the front wheel (5) to rotate, thereby driving the crawler (4) to move forward; The sprocket wheels (3) on the front and rear sides of the front wheel (5) are synchronously lowered to press the crawler belt (4) toward the ground, and the sprocket wheels (3) on both sides and the front wheel (5) are in the same horizontal plane, so that the crawler belt (4) forms surface contact with the ground; The sprocket wheels (3) on the front and rear sides of the front wheel (5) rise synchronously, and the track (4) is tensioned by the tension wheel (7), so that the track (4) only wraps around the bottom of the front wheel (5) to form a linear contact between the track (4) and the ground.

2. The front wheel drive mechanism of a road roller adapted for construction on sandy land according to claim 1 is characterized in that: The sprocket wheel (3) is lifted and lowered by a downward-pressing oil cylinder (8) vertically mounted on the vehicle frame (1).

3. The front wheel drive mechanism of a road roller adapted for construction on sandy land according to claim 1 is characterized in that: The tensioning wheel (7) realizes the tensioning action through a tensioning mechanism vertically mounted on the vehicle frame (1).

4. The front wheel drive mechanism of the road roller adapted for construction on sandy land according to claim 3 is characterized in that: The tensioning mechanism is a tensioning oil cylinder (9) or an elastic tensioning device.

5. The front wheel drive mechanism of the road roller adapted for construction on sandy land according to claim 4 is characterized in that: The elastic tensioning device comprises a lifting rod (10) vertically slidably arranged on the frame (1), a limit plate (11) fixedly mounted on the lifting rod (10), a spring (13) sleeved on the lifting rod (10) between the limit plate (11) and the frame (1), and a guide column (12) guided through a guide hole of the frame (1) is also provided on the limit plate (11), and the tensioning wheel (7) is arranged on the top of the lifting rod (10).

6. The front wheel drive mechanism of a road roller adapted for construction on sandy land according to claim 1, characterized in that: A bidirectional oil cylinder (2) is vertically mounted on the vehicle frame (1), and the tension wheel (7) and the sprocket wheel (3) are respectively mounted on the upper and lower ends of a movable lever of the bidirectional oil cylinder (2).

7. The front wheel drive mechanism of a road roller adapted for construction on sandy land according to claim 1, characterized in that: The width of the crawler track (4) is greater than the width of the rolling surface of the front wheel (5), and a plurality of sets of parallel crawler track drive wheels (6) are provided on the outer ring of the front wheel (5).

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