JPH09125311A - Blade flange of pavement cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To spinkle cooling water on a blade always stably and surely, and efficiently cool the blade. SOLUTION: A pavement cutting device 1 has a wheel 2a, and cuts the pavement R on the surface of a road by a blade 7 while running. Blade flanges 20 pinchedly supporting the blade 7 are provided with a water storage tank 22 receiving cooling water W supplied from the outside, and a jet hole 23 communicated to the water storage tank 22 and jetting cooling water W to the blade 7. This jet hole 23 is, for example, set at the angle 30 deg.-60 deg. against a blade shaft 6 supporting the blade 7 and the blade flanges 20 and rotating them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cutting road surface pavement such as asphalt or concrete, and more particularly to a blade cooling structure using blade flanges provided on both sides of a blade which is a cutting tooth. It is a thing.

[0002]

BACKGROUND OF THE INVENTION When a pavement surface such as a paved road such as asphalt or concrete is peeled off for construction work, it is cut by a circular cutting blade called a blade. In the pavement cutting device for this purpose, the blade rotates at a high speed to cut a hard road surface such as asphalt, so that the blade is overheated and the wear caused by it is severe, and therefore water is conventionally applied to the blade (hereinafter referred to as cooling water). ) Is applied to suppress overheating of the blade and prevent wear as much as possible. Of course, the water spray on the blade also serves as a measure against dust generated when cutting the pavement with the blade. As a concrete method of this water sprinkling, for example, a method of applying cooling water by a water injection pipe installed facing a blade is generally used. Further, as a method for efficiently and evenly applying cooling water to the blade, for example, as shown in FIG. 7, the blade 7'is sandwiched so that the blade flange 20 'is located near the center of the outer surface (on the side not contacting the blade 7'). There is a method in which the cooling water W'is jetted from the recessed portion 26, the jetting hole 23 'is drilled in the peripheral surface extending from the recessed portion 26 toward the outer periphery. According to such a method, a pump or the like is not required, and the cooling water W'is automatically dispersed by utilizing the centrifugal force of the blade flange 20 ', so that the entire surface of the blade 7'can be sprayed.

However, the blade flange 2 as described above
Even if water is sprinkled using the holes on the peripheral surface of 0 ', the cooling water W'is not sufficiently guided to the blade 7'and does not enter the ejection hole 23' of the blade flange 20 'by the centrifugal force as shown by an arrow A in the drawing and remains as it is. There was a strong tendency to dissipate. As a result, there is a problem that the supply of the cooling water W'to the blade 7'is in an insufficient state or the water spray is interrupted.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a background, and an ejection hole is bored in a blade flange, and cooling water is applied to the blade from here by utilizing centrifugal force of the blade flange. With regard to the jetting means, an attempt was made to develop a blade flange in a pavement cutting device that constantly and reliably applies cooling water to the blade and efficiently cools the blade.

[0005]

That is, the blade flange in the pavement cutting device according to claim 1 is such that the blade is sandwiched in the pavement cutting device for cutting the surface of the road by the blade while traveling with wheels. The supporting blade flange is provided with a water storage groove for receiving cooling water supplied from the outside, and an ejection hole communicating with the water storage groove and ejecting the cooling water to the blade. Is. By adopting such means, the cooling water is spouted from the spout hole while temporarily storing the cooling water in the water storage groove, so that the cooling water is constantly and constantly applied to the blade at a constant water amount. Further, since the means for storing water is in the shape of a groove, even though the entire blade flange is rotating at high speed, cooling water is always reliably received, and there is no waste of being dissipated. Further, a complicated structure is not required to receive the cooling water especially during high speed rotation, and the water storage means can be constructed at low cost.

Further, in the blade flange in the pavement cutting device according to the second aspect, in addition to the above requirements, the ejection hole is
It is characterized in that it is set at an angle of 30 ° to 60 ° with respect to the blade axis that supports and rotates the blade and the blade flange. With such a measure, the cooling water is jetted toward the blade. Therefore, in addition to the above-described effects, there is almost no cooling water that does not fall on the blade and directly falls on the road, and the cooling efficiency of the blade with respect to the amount of cooling water used is increased.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the illustrated embodiments. FIG. 1 shows a pavement cutting device 1 to which a blade flange is applied in the pavement cutting device of the present invention. First, the outline of this device will be described. As an example, the pavement cutting device 1 has wheels 2a on the lower surface side of an L-shaped vehicle body 2 when viewed from the side, and has a dolly shape as a whole. The vehicle body 2 is divided into a vehicle body stand portion 2A and a vehicle body vertical portion 2B, and a prime mover 3 and a fuel tank 4 for supplying fuel to the prime mover 3 are provided on the body stand portion 2A.
An attitude setting device 5 having an attitude setting gauge 5a is provided at the tip of the vehicle body stand 2A. A blade shaft 6 is rotatably provided on the lower surface side of the vehicle body stand 2A. A blade 7 for cutting a pavement R on a road surface such as concrete or asphalt is sandwiched by a blade flange 20 according to the present invention and provided at one end of the blade shaft 6, and the drive motor 3 is driven at the other end. The transmission belt 9 for transmission is wound. The blade flange 20 will be described in detail later.

On the other hand, an iron pipe-shaped operation handle 10 is provided on both sides of the upper end of the vehicle body vertical portion 2B, and a traveling handle 11 is provided on the upper surface. Further, various operation levers for steering are provided on the vertical portion 2B of the vehicle body. Further, a water storage tank 12 having a capacity of, for example, 30 liters for supplying cooling water W such as tap water to the blade flange 20 is provided inside the vehicle vertical portion 2B. A water supply pipe 13 is provided from the bottom side of the water storage tank 12 toward the blade flange 20 side. The water supply pipe 13 is bifurcated on the blade cover 8, and the cooling water W is separately supplied to the blade flanges 20 on the left and right side surfaces of the blade 7. A water supply cock 13a is provided in the middle of the water supply pipe 13. The schematic basic configuration of the pavement cutting apparatus 1 of the present embodiment is as described above, and a detailed description thereof will be omitted. However, the present invention is applied to various other types of pavement cutting apparatus having a blade flange. You can

Next, the blade flange 20 according to the present invention will be described. The blade flange 20 is provided by being fixed to the blade shaft 6 so as to hold the blade 7 as shown in FIGS. 1 to 3, and the two blade flanges 20 provided on both left and right sides of the blade 7 have the same shape. It is a thing. Specifically, as an example, as shown in FIG. 4, it has a disc shape as a whole, and has a core hole 21 at the center for installation on the blade shaft 6. The peripheral portion is formed in an inner flange shape on the outer surface side opposite to the blade 7, and the tip end thereof is directed to the core hole 21. As a result, a U-shaped groove is formed inside the peripheral edge portion, and the water storage groove 2 for temporarily pooling the cooling water W supplied from the water supply pipe 13 is formed in the groove.
It is 2. In the following description, the inner surface side of the blade flange 20 refers to the side in contact with the blade 7,
The outer surface side refers to the opposite surface side.

A corner of the peripheral edge of the blade flange 20 on the side of the blade 7 is tapered toward the side of the blade 7, and the jet hole 23 penetrating the outer surface of the tapered portion and communicating with the water storage groove 22. Is perforated. Note that the angle of the ejection hole 23 is toward the blade 7 at an angle of 48 ° with respect to the blade shaft 6, for example. The angle of inclination with respect to the blade 7 varies depending on the relative size of the blade 7 and the blade flange 20 and design dimensions such as the position where the ejection hole 23 is punched.
In short, the cooling water W is applied to the blade flange 20 without waste, and it is particularly important to remove the frictional heat of the tooth portion on the tip side. In that sense, it is preferable to set the angle to 30 ° to 60 °. The tip of the water supply pipe 13 extending from the water storage tank 12 has a water storage groove 22 of the blade flange 20.
It is facing.

The blade flange 20 in the pavement cutting apparatus 1 of the present invention is constructed as described above, and its operation will be described below. First, the pavement cutting device 1 will be described. The cutting line L in which the posture setting gauge 5a is drawn in advance.
Rotate the traveling handle 11 while moving it upward to move it forward. The blade 7 rotated by the prime mover 3 cuts the pavement R such as asphalt. Then blade 7
Rotates at a high speed of, for example, about 3000 rpm to cut the pavement R, so that the frictional heat causes the temperature to become high, resulting in severe blade wear. Therefore, the cooling water W in the water storage tank 12 is cooled by applying it to the blade 7.

The cooling mode of the blade 7 will be described below. When the water supply cock 13a is opened, the cooling water W in the water storage tank 12 is supplied toward the blade cover 8 by the natural falling force, and is supplied from the tip of the water supply pipe 13 to the water storage groove 22 of the blade flange 20. Since the water storage groove 22 has a groove shape, it can always receive the cooling water W even during high speed rotation. Further, since it is rotating at a high speed, the cooling water W in the water storage groove 22 is ejected from the ejection hole 23 by the centrifugal force. The jet angle of the cooling water W is 48 ° with respect to the blade axis 6 and is inclined toward the blade 7, so that the cooling water W is reliably applied to the blade 7. Although the portion of the blade 7 that requires the most cooling is the outer peripheral tip portion, the cooling water W is directly applied to this portion as well, or the cooling water W applied to the center side of the blade 7 is generated by the centrifugal force of the blade 7. It will hit the tip of 7. As described above, the cooling water W splashing on the blade 7 is vaporized and deprives the frictional heat of the blade 7. Therefore, wear of the blade 7 is reduced and the life is extended. Further, the cooling water W also acts as sprinkling water for preventing dust generated during cutting.

[0013]

Other Embodiments of the Invention Although the present invention is configured as described above, various other modifications can be made. 5A and 5B are four sectional views showing different shapes of the water storage groove 22 of the blade flange 20. In FIG. 5A, the water storage groove 22 has a wide groove shape. When configured in this way, the cooling water W can be pooled in a larger amount, and the cooling water W ejected from the ejection holes 23 is more stable without being interrupted. Further, under the same idea, a deep groove may be formed as shown in FIG. Further, as shown in FIG. 5C, the pooled cooling water W may be easily held, or conversely, as shown in FIG. 5D, an acute groove shape may be used. When the groove shape has an acute angle as described above, the blade flange 20 becomes lighter, and there is a merit that the rotational drive of the blade 7 becomes stable.

Although the angle at which the blade 7 is jetted is constant in the basic embodiment, for example, as shown in FIG. 6A, a variable nozzle 24 is provided so that the jetting angle can be adjusted. You may leave it. Even when the ejection angle is fixed, the blade flange 20 should be provided with a plurality of types of angles, such as alternately providing ejection holes 23 of 48 ° and 55 ° with respect to the blade shaft 6. Is possible. It is also possible to make the size of the ejection hole 23 changeable so that the ejection amount of the cooling water W from the ejection hole 23 can be changed.
For example, as shown in FIG. 6B, a slide ring 25 having a large number of adjustment holes 25a is slidably provided on the circumference of the ejection hole 23. By moving, the size of the ejection hole 23 can be substantially changed.

Further, in the basic embodiment, the blade flange 2
The cooling water W is supplied to 0 from the water storage tank 12 in the vertical portion 2B of the vehicle body. However, if a water supply pipe for supplying the cooling water W to the water storage groove 22 of the blade flange 20 is provided, Alternatively, the water may be supplied from a tank for water storage provided on an external dolly or a truck carrier. Although the water supply cock 13a is used in the basic embodiment,
A screw type that can finely adjust the water flow such as a faucet may be used. Instead of such a manual valve, a solenoid valve or the like may be used to adjust the water flow according to the situation. When the cooling water W overflows from the water storage groove 22 by an appropriate sensor such as ultrasonic waves, the solenoid valve is controlled so that the water flow is small and the temperature of the blade 7 is detected. An embodiment is possible in which the cooling water W is supplied when a sensor is provided to detect frictional heat of the blade 7 at a certain temperature or higher.

[0016]

According to the blade flange in the pavement cutting device according to claim 1, the blade flange 20 is provided with
A water storage groove 22 for receiving cooling water W supplied from the outside,
An ejection hole 23 that communicates with the water storage groove 22 and ejects the cooling water W to the blade 7 is provided. Therefore, the cooling water W is ejected from the ejection holes 23 while temporarily storing it in the water storage groove 22, so that the cooling water W is constantly and constantly applied to the blade 7 in a constant and constant amount. Further, since the means for storing water is the groove shape, the cooling water W can be reliably received even though the entire blade flange 20 is rotating at a high speed, and there is no waste of being dissipated. A complicated structure is not required to receive the cooling water W particularly during high speed rotation, and the water storage means can be constructed at low cost.

According to the blade flange of the pavement cutting device of the second aspect, the ejection hole 23 is provided with the blade 7
And an angle of 30 ° to 60 ° with respect to the blade shaft 6 that supports and rotates the blade flange 20.
Therefore, the cooling water W is jetted toward the blade 7. Therefore, there is almost no cooling water W that does not fall on the blade 7 and falls on the road as it is, and the cooling efficiency of the blade 7 with respect to the amount of the cooling water W used becomes high.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a pavement cutting device to which a blade flange of the present invention is applied.

FIG. 2 is an exploded perspective view showing the periphery of the above blade flange.

FIG. 3 is a vertical sectional front view of the same.

FIG. 4 is a side view showing the inner surface side of the blade flange of the present invention, which is the side where the blade is located, and a front view showing the upper half in section.

FIG. 5 is a vertical cross-sectional view showing various embodiments in which the shape of the water storage groove is different.

FIG. 6 is a vertical cross-sectional view showing another embodiment in which the jetting angle of cooling water is adjustable, and a perspective view showing another embodiment in which the jet amount from the jet holes can be changed.

FIG. 7 is a vertical cross-sectional front view showing an embodiment of ejection of cooling water from a conventional blade flange.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pavement cutting device 2 Car body 2a Wheels 2A Car body stand 2B Car body vertical part 3 Motor 4 Fuel tank 5 Attitude setting device 5a Attitude setting gauge 6 Blade shaft 7 Blade 8 Blade cover 9 Transmission belt 10 Operation handle 11 Traveling handle 12 Water storage tank 13 Water supply pipe 13a Water supply cock 20 Blade flange 21 Core hole 22 Water storage groove 23 Jet hole 24 Variable nozzle 25 Slide ring 25a Adjustment hole 26 Recessed portion L Cutting line R Pavement W Cooling water

Claims (2)

[Claims] 1. In a pavement cutting device for cutting a road surface with a blade while traveling with wheels, a blade flange for supporting the blade so as to sandwich the blade has a water storage groove for receiving cooling water supplied from the outside. And a jet hole communicating with the water storage groove and jetting cooling water to the blade, the blade flange in a pavement cutting device. 2. The jet hole has an angle of 30 ° with respect to a blade shaft that supports and rotates the blade and the blade flange.
The blade flange in the pavement cutting device according to claim 1, wherein the blade flange is set at an angle of 60 °.