JPH0444042B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to slope surfaces such as asphalt finishers and compaction rollers used in asphalt paving of slope surfaces (sloped surfaces) such as test courses and embankments. This invention relates to a support mechanism for a slope construction machine using a wire rope of a winch installed on an anchor car when the construction machine runs in synchronization with an anchor car (traveling car) placed at the top of the vehicle to perform compaction work, etc.

[Prior Art] Asphalt pavement on slopes such as test courses and embankments has a relatively short legal length and a long extension distance, so pavement work is generally performed in the extension direction. Therefore, slope construction machines such as asphalt finishers and compaction rollers are supported by wire ropes or the like from an anchor car (driving car) placed at the top and run in synchronization with the anchor car. Therefore, the slope construction machine runs tilted left and right by the inclination angle of the slope.

FIG. 1 shows a situation where tire rollers are rolling a slope. In order to prevent the tire roller 1 from sliding down the slope or overturning due to the component force F of its own weight W shown in FIG.
It is supported at a support point 5 via a wire rope 4. The tire roller 1 and the anchor vehicle 2 simultaneously move forward and backward at the same speed to perform compaction work on the slope M.

By the way, since the legal length L of the rolling surface is larger than the rolling width B of the tire roller 1, the tire roller 1 needs to move up and down within the range of the legal length L to uniformly roll the entire surface.

Conventionally, in these operations, the operator of the tire roller 1 and the operator of the anchor car 2 actuated the winch 3 while giving signals to each other, and the wire rope 4
I was working on adjusting the length of the. In this conventional method, it is difficult for the operator of the tire roller 1 to perform the work as expected due to insufficient signals among fellow operators, and it is also very dangerous. In addition, because the wire rope 4 inevitably becomes too tensioned or too loose, the load ratio between the lower tire 6' and the upper tire 6'' of the tire roller 1, that is, the ground contact pressure, constantly changes.
It is nearly impossible to achieve uniform compaction over the entire surface.

Next, the relationship between the mounting position of the support point 5 of the wire rope 4 and the balance of the tire roller 1 will be explained.

FIG. 3 is an explanatory diagram when the position of the support point 5 is higher than the center of gravity position G of the tire roller 1. The tire roller 1 is stabilized by the tension T of the wire rope 4 and the sliding friction resistance F0 of the tire. That is, the required tension of the wire rope 4 is T=F-F0. Considering the overturning moment acting on the tire roller 1, the tire roller 1 is in a stable state when T・l1=F・l2, and the left and right tire ground pressures P1 and P2 are also P1
=P2. Therefore, the tension T of the wire rope 4
It is necessary to set T=(F·l2)/l1, but it is very difficult to accurately control this value using conventional methods. In addition, since the running position of the tire roller 1 is not always at a constant position, but needs to move to the upper side or lower side of the slope M, the wire rope 4 also needs to follow this and wind up or lower the winch. It can be said that it is impossible to accurately control the tension T of the wire rope 4. If the tension T is smaller than the required value, the ground pressure of the left and right tires will be P2>P1, and if it is larger than the required value, P1>P2. Therefore, variations occur in the rolling force applied to the pavement surface, making it impossible to obtain uniform compaction density.

[Object of the Invention] Therefore, the object of the present invention is to eliminate the drawbacks of these conventional methods and to provide a slope construction machine such as a rolling compaction roller that can perform slope construction work such as rolling compaction work safely and accurately. To provide a support mechanism.

[Structure of the Invention] Therefore, according to the present invention, the winch is supported by the wire rope of the winch installed on the vehicle that is disposed on the top and runs on the top of the top, and is mounted on the slope in synchronization with the vehicle. In the support mechanism that supports slope construction machines such as compaction rollers that run in a direction perpendicular to the slope length,
The slope construction machine automatically moves the support point of the wire rope so that the support point of the wire rope is always located on a straight line connecting the center of gravity of the winch and the slope construction machine, regardless of the slope angle of the slope. A support mechanism for a slope construction machine supported by a wire rope via an automatic center of gravity adjustment mechanism is provided.

Further, when carrying out the present invention, the automatic center of gravity adjustment mechanism has an arcuate guide rail fixed to the slope construction machine and a wire rope that is attached to the tip of the wire rope so that the automatic center of gravity adjustment mechanism can move freely along the arcuate guide rail. or a pair of links, one end of which is rotatably connected to the slope construction machine with a pin, and the tip of a wire rope connected to the other end of the pair of links. Preferably, it consists of a movably pin-connected link.

[Operations and Effects of the Invention] As described above, according to the present invention, the support point of the wire rope is always located on the straight line connecting the center of gravity of the winch and the slope construction machine, regardless of the slope angle of the slope. Therefore, for example, when rolling a slope using a rolling compaction roller, the load ratio between the lower and upper tires, that is, the ground contact pressure, is always uniform, and uniform compaction can be performed over the entire slope. In addition, it is mechanically simple and operates reliably, and does not increase the cost of the slope construction machine.

[Examples] Examples of the present invention will be described below with reference to the drawings.

A first embodiment of the present invention is shown in FIG. 4, where 1 is a compaction roller, 2 is an anchor wheel, and 3 is a hydraulic winch designed to keep the tension T of the wire rope 4 constant at all times.

Now, if the self-weight W and slope angle θ of the compaction roller 1 are known, the component force F acting on the compaction roller 1 is F=Wsinθ
is required. Therefore, if the magnitude of the tension T of the wire rope 4 is T=F, the overturning moment acting on the compaction roller 1 becomes zero, and the compaction roller 1 is in a completely stable state and the ground pressure at both left and right ends is low. P1, P2
are also equal to each other, and it becomes possible to drive in the same way as driving on flat ground. To this end, in this embodiment, a roller 7 is attached to the tip of the wire rope 4, and this roller 7 (support point) is movable along an arcuate guide rail 8 fixed to the compaction roller 1. Therefore, the position of the support point 7 of the compaction roller 1 is automatically adjusted on the straight line connecting the center of gravity G and the winch 3, and no matter how the inclination angle of the compaction roller 1 changes, the position of the support point 7 remains the same. is on the extension line of the center of gravity G.

In addition to the first embodiment shown in FIG. 4, this automatic center of gravity adjustment mechanism has a second embodiment shown in FIG.
0 and 10, and a link 11 is connected to the other end of the pair of links 9 and 9 with pins 12 and 12.
It is also possible to have a structure in which the wire ropes 4 are rotatably connected by a link 11 and the tip of the wire rope 4 is connected 13 to the link 11. This makes it possible to automatically determine the exact position of the center of gravity, which has been extremely difficult in the past.

Next, an example of a constant tension type hydraulic winch that is suitably used in carrying out the present invention will be described with reference to FIG. 6. The constant tension hydraulic winch includes a hydraulic pump 14 that automatically throttles the discharge flow to maintain a constant pressure when the discharge pressure reaches a set value, a rotary switching valve 15,
It is composed of a hydraulic motor 16 for driving the winch drum, relief valves 17 and 18, a tank 19, etc., and is connected to piping.

The operating method is to first determine the required tension T of the wire rope 4.
is calculated, and the relief valves 17 and 18 are set so that the hoisting force of the winch drum 3 matches this. Next, operate the hydraulic pump 14 and pull the lever of the control valve 15 to set port B. High pressure oil discharged from the hydraulic pump 14 flows in the direction of the solid arrow, rotates the hydraulic motor 16, and winds up the winch drum 3. Return oil from the hydraulic motor 16 returns to the hydraulic tank 19 via the path indicated by the dotted arrow.

Now, when the tension of the wire rope 4 reaches the required tension, the hydraulic pressure in the discharge side hydraulic piping is reduced to the relief valve 1.
7, the relief valve 17 opens, high-pressure oil is released to the hydraulic tank 19, the rotation of the hydraulic motor 16 is stopped, and the winch drum 3 is held. At this time, the hydraulic pump 14 automatically throttles the discharge amount in response to the discharge pressure, and discharges an amount of oil that matches the amount of oil leaking in the hydraulic circuit, thereby preventing unnecessary increases in oil temperature. prevent.

Note that port A of the control valve 15 is used by the winch 3 to pull out the wire rope 4 when no load is applied. The relief valve 18 is a safety valve when the discharge pressure of the hydraulic pump 14 becomes abnormally high due to a failure of hydraulic equipment or the like.

Here, an explanation will be added using FIG. 4. In FIG. 4, the compaction roller 1 is pulled at the center of gravity G by a wire rope tension T that matches the component force F, and is supported in a safe and stable state. Now, in order for the compaction roller 1 to change the compaction lane, when the running handle is operated toward the upper side of the slope M, the tension T of the wire rope 4 is
decreases, and the pressure inside the pipe decreases, so high-pressure oil is supplied from the hydraulic pump 14 in FIG. 6, and the winch drum 3 is hoisted. In this way, the compaction roller 1 is always supported with a constant tension and can be moved successively to the upper side of the slope in a stable state.

Conversely, when the compaction roller 1 moves toward the lower part of the slope and operates the handle, the wire rope 4 is pulled, the hydraulic motor 16 shown in FIG. operates and releases high pressure oil to the hydraulic tank 19. In this way, the winch drum 3 is slowly rewound, and the rolling roller 1 is moved below the slope M. In addition,
The constant tension winch is not limited to the hydraulic type, but may also be a pneumatic winch.

7 to 9 show another embodiment of the present invention, in which the rolling roller 1 moves along the direction of inclination of the slope. In the rolling pressure roller 1 traveling on an inclined surface, if the inclination angle θ is known, the component force F acting on the roller can be calculated as F=Wminθ. If the tension F1 of the wire rope 4 of the winch 3 is set to F1=F, only the vertical component force P acts on the roller, which is the same as on a flat land. Therefore,
The rollers can move forward or backward on their own by operating the speed change lever. Note that 22 is a pulley.

For this purpose, winch 3 is a hydraulic winch,
It is designed to detect the tension of the wire rope 4 and keep it constant. As shown in FIG. 9, high pressure oil flows from the hydraulic pump 14 driven by the engine E in the direction of the dotted arrow, and when the switching valve 15 is switched to the A port, the hydraulic motor 16 rotates the winch 3 in the hoisting direction, and the wire Wind up rope 4. At this time, the relief valve 17 is set in advance to the roller 1.
The wire rope tension should be set to match the wire rope tension F1 required for stability. Therefore, the wire rope tension is
When F1 is reached, the relief valve 17 operates, releasing high pressure oil and stopping the winch. At this time, the discharge amount of the hydraulic pump 14 is also automatically reduced.

That is, the winch 3 always maintains the hoisting force so that the tension of the wire rope 4 is constant.
Now, when the roller 1 tries to move up the slope by itself, the tension of the wire rope 4 decreases and the pressure inside the hydraulic motor also decreases, so the winch 3 is hoisted up. On the other hand, when the roller tries to descend, the wire rope is pulled and the tension F1 increases, but
The load meter L detects this change in tension and issues a signal, actuating the switching valve 20 to switch to the A port and letting high pressure oil escape from the relief valve 13. Therefore, the hydraulic motor 21 reverses, and the wire rope 4
Wind down.

In this way, by using the roller traction device according to the present invention, the roller can freely move forward or backward by itself even on an inclined surface in the same way as on a normal flat surface. Therefore, unlike conventional equipment, there is no need for two operators to operate in a coordinated manner, and there is no need for incomplete signaling or
In addition, there is no risk of malfunction, and even if the wire rope breaks, the rollers will not run out of control.

Furthermore, since the wheels are driven by the engine, unlike the wheels A in FIG. 8, the asphalt mixture is not pushed out, and the flatness of the rolling surface can be easily ensured like the wheels B. Therefore, when using this device, it is possible to achieve even greater effectiveness by using rollers that can drive both the front and rear wheels.
In this embodiment, the winch is driven by a hydraulic motor, but it can also be driven by an electric motor.

[Conclusion] As explained above, according to the support mechanism of the present invention, the compaction roller is supported so that the ground pressure at both left and right ends is always equal, so that uniform compaction of good quality can be performed over the entire surface. . In addition, by using a constant tension hydraulic winch, the compaction roller can be automatically moved to the top or bottom of the slope without the need for the anchor vehicle operator to operate the winch, thereby preventing winch malfunction. This eliminates the danger caused by such problems and reduces operator fatigue. Although the above description has mainly focused on the compaction roller, it goes without saying that the support mechanism of the present invention can be suitably used not only for supporting the compaction roller but also for supporting other slope construction machines such as asphalt finishers. .

[Brief explanation of drawings]

Figure 1 is a front view showing a situation in which a slope is being rolled by a rolling roller supported by the wire rope of a winch installed on an anchor car placed at the top, and Figures 2 and 3 are The figure is an explanatory diagram showing the relationship of forces acting on the compaction roller, and FIG. 4 is a front view of the anchor wheel and compaction roller, showing the state in which the compaction roller is supported by the support mechanism according to the first embodiment of the present invention. ,
FIG. 5 is a front view of an anchor wheel and a rolling pressure roller showing a state in which the rolling pressure roller is supported by a support mechanism according to a second embodiment of the present invention, and FIG. 6 is a front view of a rolling pressure roller that is preferably used in carrying out the present invention. Fig. 7 is a circuit diagram of a constant tension type hydraulic winch that can be used. Fig. 7 is a diagram similar to Fig. 1 showing the third embodiment of the present invention. Fig. 8 is a diagram showing the state of asphalt mixture being raised by the rollers and according to this embodiment. FIG. 9 is a circuit diagram of the hydraulic winch, showing a comparison between the horizontal state and the flat state. 1... compaction roller, 2... anchor car, 3...
winch, 4...wire rope, 5...support point,
6', 6''... Tire, 7... Roller, 8... Bow-shaped guide rail, 9... Link, 10... Pin, 1
1...Link, 12...Pin, 13...Support point,
14...Hydraulic pump, 15...Circuit switching valve,
16... Hydraulic motor, 17, 18... Relief valve, 19... Tank.

Claims (1)

[Scope of Claims] 1. Supported by a wire rope of a winch installed on a vehicle running on the top of the mountaintop, the winch runs on the slope in a direction perpendicular to the vertical length in synchronization with the vehicle. In a support mechanism that supports a slope construction machine such as a rolling compaction roller, the slope construction machine always aligns the support point of the wire rope with the center of gravity of the winch and the slope construction machine, regardless of the inclination angle of the slope. A support mechanism for a slope construction machine, characterized in that the support point is supported by a wire rope via an automatic center of gravity adjustment mechanism that automatically moves the support point so that it is positioned on a straight line connecting the positions. 2. The automatic center of gravity adjustment mechanism consists of an arcuate guide rail fixed to the slope construction machine and a roller that is attached to the tip of a wire rope and moves freely along the arcuate guide rail. A support mechanism for a slope construction machine according to claim 1, characterized in that: 3. The automatic adjustment mechanism includes a pair of links, one end of which is rotatably connected to the slope construction machine with a pin, and a tip of a wire rope connected to the other end of the pair of links, which is rotatably connected with the pin. 2. The support mechanism for a slope construction machine according to claim 1, wherein the support mechanism is comprised of links that are attached to each other.