JPH0211686B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a slope compaction roller used for asphalt paving on slopes of automobile test courses, velodromes, irrigation canals, etc., which is capable of controlling the contact pressure on the upper side of the paving slope and the pressure on the lower side of the paving slope. The present invention relates to a device that automatically adjusts and supports the contact pressure so that it is approximately equal.

When compacting asphalt that has been placed on a slope using a compaction roller, wires are secured by an anchor car running on the horizontal ground above the slope to prevent the compaction roller from tipping over or sliding down. It is necessary to support the compaction roller via a strip such as a rope. In this case, the compaction roller and the anchor wheel do not necessarily run perfectly parallel, and the angle of inclination of the slope may change while the compaction roller is running, so the tension of the strip is reduced by the compaction roller. It often changes while the roller and anchor cars are running.

When the tension of the strip becomes larger than the predetermined tension, the contact pressure of the rolling roller on the upper side of the pavement slope becomes excessive, and the contact pressure on the lower side of the pavement slope becomes too small, and the tension of the strip becomes larger than the predetermined tension. If the contact pressure on the lower side of the pavement slope of the compacting roller becomes too small, the contact pressure on the upper side of the pavement slope becomes too small. Large depressions occur in the asphalt pavement in areas where the contact pressure is too high, and rolling is incomplete in areas where the contact pressure is too low, making it impossible to perform good rolling and compaction.

SUMMARY OF THE INVENTION An object of the present invention is to provide a support device for automatically adjusting the contact pressure of a slope rolling pressure roller, which advantageously solves the above-mentioned problems.

Next, the present invention will be explained in detail using illustrated examples.

Figures 1 to 6 show an embodiment of the present invention, in which an anchor vehicle 2 consisting of a tracked vehicle running on a horizontal ground surface 8 above a slope portion to be paved with asphalt is provided with liquid. A pressure motor M, a winding drum 3 driven by the winding drum 3, an automatic adjustment hydraulic pressure control device 9, and a compaction roller power supply control device 10 are installed, and the wire rope or the like that is unwound from the winding drum 3 is The body 4 is wrapped around a guide sheave 11 attached to the anchor car 2, and is connected to the upper part of the car body 12 of a rolling pressure roller 5 made of tire rollers.

Bent level detection operating levers 15 and 16 are provided at the bottom of the compaction roller 5 on both left and right sides of the vehicle body 12.
A support ring 6 is attached to the lower end of the inclined portion of the level detection operation levers 15 and 16, and the support ring 6 is attached to the level detection operation levers 15 and 16 in the direction in which the support wheel is pressed. A spring 33 is engaged to rotate the limit switch LS ₁ for pressure reduction control and the limit switch LS ₂ for pressure increase control.
6 and is fixed to the vehicle body 12.

The bearing ring 6 is, for example, a metal roller or a plastic roller.

4 to 6 show the switching state of the hydraulic pressure control circuit in the contact pressure automatic adjustment support device, in which the manual switching valve 17 is switched to the automatic adjustment position (intermediate position), and the automatic adjustment switch is switched to the automatic adjustment position (intermediate position). When turned on, the solenoid SOL ₃ of the automatic adjustment operating solenoid valve 18 is energized, and the solenoid valve 18 is switched to the automatic adjustment position (left side position).

FIG. 4 shows a state in which the hydraulic pressure in the winding-side liquid feed path and the strip tension in the hydraulic pressure control circuit of the automatic contact pressure adjustment support device are balanced, that is, in the winding direction of the winding drum 3 by the hydraulic motor M. When the torque and the torque in the unwinding direction of the winding drum 3 due to the tension of the strip are in equilibrium, the limit switches LS ₁ and LS ₂ that control the solenoids SOL ₁ and SOL ₂ of the solenoid valve switching valve 7 are turned off. Therefore, the electromagnetic switching valve 7 is switched to the intermediate position (equilibrium position).

In the state shown in FIG. 4, the pressure fluid from the pump P is sent through the check valve 19 and the solenoid valve 18 to the take-up side liquid supply port 20 of the liquid valve motor M and the counterbalance valve CV. The pressure liquid in the take-side liquid feed path is
Main relief valve 21, for example, the first one with a set pressure of 50Kg/cm ²
Adjustment relief valve 22 and set pressure, for example 10Kg/cm ²
The main relief valve 21 is set at 60Kg/cm 2 , so that the main relief valve 21 is set at 60Kg/cm ² .
Therefore, the liquid pressure in the winding-side liquid sending path is set to 60 Kg/cm ² , and the unwinding direction torque due to the strip tension and the winding direction torque of the hydraulic motor are balanced.

The hydraulic pressure setting at equilibrium is adjusted appropriately according to changes in the inclination angle of the paved slope.

Next, the contact pressure of the tire 26 on the upper side of the paved slope is higher than the contact pressure of the tire 26 on the lower side of the paved slope on the compaction roller 5.
When the contact pressure of the tire 27 becomes large,
Since the amount of compression increases, the pressure reduction control limit switch LS ₁ is operated and turned on by the level detection operation member 15 on the upper side of the pavement slope, and the solenoid SOL ₁ of the electromagnetic switching valve 7 is energized by the on signal, and the fifth As shown in the figure, the electromagnetic switching valve 7 is switched to the left position (pressure reduction position).

In the state shown in FIG. 5, the pressure liquid in the winding side liquid supply path flows into the tank 28 through the main relief valve 21 and the first adjustment relief valve 22, so that the set pressure of the main relief valve 21 is 50 kg/cm. ² , and as a result, the liquid pressure in the winding-side fluid passage also drops to 50Kg/ ^cm2 , and the torque in the winding direction of the winding drum caused by the hydraulic motor is higher than the torque in the unwinding direction of the winding drum due to the strip tension. Therefore, the hydraulic motor M is rotated in the unwinding direction, and the strip 4 is repeated from the winding drum 3, and the contact pressure of the tire 27 on the upper side of the paved slope decreases. When the contact pressure decreases to almost a predetermined value, the limit switch LS ₁ for pressure reduction control is turned off, so the solenoid SOL ₁ is demagnetized, and the solenoid switching valve 7 is switched to the intermediate position as shown in Fig. 4, and the solenoid is turned off again. Return to equilibrium.

Next, the contact pressure of the tire 27 on the lower side of the paved slope is greater than the contact pressure of the tire 27 on the upper side of the paved slope on the compaction roller 5.
When the contact pressure of the tire 26 becomes large,
Since the compression amount also increases, the pressure increase control limit switch LS ₂ is operated and turned on by the level detection operation member 16 on the lower side of the pavement slope, and the solenoid SOL ₂ of the electromagnetic switching valve 7 is energized by the on signal. As shown in FIG. 6, the electromagnetic switching valve 7 is switched to the right position (pressure increase position).

In the state shown in FIG.
For example, since the flow passes through the third regulating relief valve 29 with a set pressure of 20 Kg/cm ² , the set pressure of the main relief valve 21 is adjusted to 70 Kg/cm ² , and therefore the liquid pressure in the winding side liquid supply path is also 70 Kg/cm 2 . ^cm2 , the torque in the winding direction of the winding drum caused by the hydraulic motor becomes larger than the torque in the unwinding direction of the winding drum due to the tension of the strip, and therefore, the hydraulic motor M rotates in the winding direction. and winding drum 3
The strip 4 is wound around the tire 26 on the lower side of the paved slope.
contact pressure decreases. When the contact pressure decreases to almost a predetermined value, the limit switch for pressure increase control is activated.
Since LS ₂ is turned off, the solenoid SOL ₂ is demagnetized and the solenoid switching valve 7 is switched to the intermediate position as shown in FIG. 3, returning to the equilibrium state again.

Note that by manually adjusting the first regulating relief valve 22, the second regulating relief valve 23, and the third regulating relief valve 29, the set pressure of the main relief valve 21 during equilibrium, unwinding, and winding can be adjusted. be able to.

In the hydraulic control circuit shown in FIG. 4, the solenoid SOL ₃ of the automatic adjustment operation solenoid valve 18 is demagnetized,
After switching the solenoid valve 18 to the automatic adjustment non-operating position (right side position), if the manual switching valve 17 is manually moved to the left or right side, the hydraulic motor M can be set to winding operation or rewinding operation by manual operation. Can be switched.

In FIGS. 4 to 6, 30 is a liquid storage tank, 31 is a check valve, and in FIG. 1, 32 is a power supply cable.

Next, the contact pressure adjustment principle of the contact pressure automatic adjustment support device for a slope rolling pressure roller according to the present invention will be explained.

If the inclination angle of the pavement slope 1 is θ, the weight of the compaction roller 5 is P, and the tension of the strip 4 is T, then when T>Psinθ, as shown in FIG. In the ground pressure distribution of No. 5, the ground pressure on the upper side of the pavement slope at the rolling compaction roller increases by the difference in which T is larger than Psinθ. When T<Psinθ, as shown in FIG. 8, the ground pressure distribution of the rolling compaction roller 5 against the pavement slope 1 is such that the ground pressure of the rolling compaction roller on the upper side of the pavement slope increases by the difference in which T is smaller than Psinθ. becomes smaller. Furthermore, T=Psinθ
In this case, as shown in FIG. 9, the ground pressure distribution of the compaction roller against the pavement slope 1 becomes uniform over the entire width of the compaction roller. Therefore, by adjusting the tension of the strip 4, the ground pressure distribution in the width direction of the rolling roller can be adjusted to be substantially uniform.

According to this invention, when the contact pressure of the rolling pressure roller 5 on the upper side of the pavement slope becomes larger than the contact pressure on the lower side of the pavement slope, the level detection operation lever equipped with the bearing wheel 6 that contacts the pavement slope 1 is activated. The pressure reduction control limit switch LS ₁ is operated by the rotation of , and the electromagnetic switching valve 7 is switched to the pressure reduction position by the signal from the limit switch LS ₁ , and the hydraulic motor M that drives the hoist drum 3 on the anchor wheel 2 starts winding. At the same time as it is rotated in the return direction, the strip 4 such as a wire rope that is fed out from the winding drum 3 and connected to the upper part of the rolling roller 5 is relaxed, so that the upper side of the pavement slope of the rolling roller 5 is loosened. When the contact pressure of the rolling roller 5 on the lower side of the paved slope becomes greater than the contact pressure on the upper side of the paved slope, the contact pressure of the paved slope 1
Pressure increase control limit switch
LS ₂ is operated and its limit switch LS ₂
In response to the signal, the electromagnetic switching valve 7 is switched to the pressure increasing position and the hydraulic motor M is rotated in the winding direction, so that the contact pressure of the compaction roller 5 on the lower side of the pavement slope is reduced to a predetermined value. Therefore, the rolling roller 5 is supported by the anchor wheel 2 while automatically adjusting so that the contact pressure on the upper side of the pavement slope and the lower side of the pavement slope on the rolling roller 5 is always approximately equal. The bearing wheels 6 are always reliably pressed against the pavement slope 1 by the force of the spring 14, so that the contact of the slope rolling rollers is reduced. This provides the advantage of being able to accurately adjust the pressure.

[Brief explanation of drawings]

1 to 6 show an embodiment of the present invention, in which FIG. 1 is a schematic front view showing a state in which the slope compaction roller is supported by an anchor wheel, and FIG. 2 is a level detection Enlarged front view of compaction roller with operating member and limit switch, 3rd
The figure is a side view, Figure 4 is a diagram showing a state in which the hydraulic pressure control circuit is in equilibrium, Figure 5 is a diagram showing a state in which the hydraulic pressure control circuit is switched to rewinding, and Figure 6 is a diagram showing the hydraulic pressure control circuit in a state in which it is switched to rewind. It is a figure which shows the state where a control circuit was switched to winding. FIGS. 7 to 9 are explanatory diagrams of the ground pressure distribution of the compaction roller. In the figure, 1 is a paved slope, 2 is an anchor vehicle,
3 is a winding drum, 4 is a strip, 5 is a compaction roller, 6 is a bearing wheel, 7 is an electromagnetic switching valve, 12 is a car body, 13 is a horizontal shaft,
14 is a spring, 15 and 16 are level detection operating levers, 18 is a solenoid valve for automatic adjustment operation, 20 is a winding side liquid supply port, 21 is a main relief valve, 22 is a first adjustment relief valve, 23 is a second adjustment Relief valve, 25 is the unwinding side liquid supply port, 26 is the tire on the lower side of the pavement slope,
27 is a tire on the upper side of the paved slope, 29 is a third adjustment relief valve, M is a hydraulic motor, LS ₁ is a limit switch for pressure reduction control, LS ₂ is a limit switch for pressure increase control, and SOL ₁ and SOL ₂ are solenoids.

Claims (1)

[Claims] 1 An anchor car 2 running on a flat ground surface above a paved slope 1 is provided with a winding drum 3 driven by a hydraulic motor M, and a strip of wire rope or the like is unwound from the winding drum 3. 4 is connected to the upper part of the rolling pressure roller 5 that rolls the slope, and the pavement slope 1 is connected to the side of the vehicle body 12 of the rolling pressure roller 5.
A level detection operating lever having a bearing wheel 6 in contact with the ground is pivoted by a horizontal shaft 13, and the level detection operating lever and the vehicle body 12 are connected by a spring 14 which acts to press the bearing wheel 6 against the pavement slope 1. A limit switch LS ₁ for pressure reduction control and a limit switch LS ₂ for pressure increase control are connected to the vehicle body 12 and operated by a level detection operation lever, and a hydraulic pressure control circuit of the hydraulic pressure motor M is controlled by the limit switch. Solenoid switching valve 7
is provided, and when the contact pressure on the upper side of the pavement slope of the rolling pressure roller 5 becomes larger than the contact pressure on the lower side of the pavement slope, the hydraulic motor M is rotated in the unwinding direction, and the rolling pressure roller 5 is rotated in the rewinding direction. Contact pressure of a slope rolling pressure roller, characterized in that the hydraulic motor M is configured to rotate in the winding direction when the contact pressure on the lower side of the slope becomes smaller than the contact pressure on the upper side of the paved slope. Self-adjusting support device.