JP2004011212A - Attachment device for road surface cutting, and working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting device having a cutting mode capable of efficiently cutting a pavement surface around a manhole. <P>SOLUTION: In this device, a "rough cutting mode" with low roughness precision of cutting section and a "finishing mode" with high precision can be easily switched with a mode change-over switch 57. Accordingly, the working efficiency can be enhanced. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cutting attachment device for cutting a road surface around a structure installed on a road surface such as a manhole, and a work machine equipped with the attachment device.
[0002]
[Prior art]
A conventional machine for cutting a pavement surface around a manhole is disclosed in Japanese Patent Application Laid-Open No. 2000-96512. This is a machine that attaches a cutting device to the tip of an articulated arm of a hydraulic working machine such as a hydraulic excavator and cuts a pavement surface around a manhole without damaging the manhole. The cutting device in this machine is an end mill that rotates and revolves around a guide portion.In the cutting operation, the revolution of the end mill and the speed of the rotation are adjusted by manually adjusting a flow control valve attached to the cutting device. ing.
[0003]
[Problems to be solved by the invention]
The finish roughness of the cut surface largely depends on the revolution speed and rotation speed of the end mill. Therefore, in the above machine, when the fineness of the cutting surface is required, the operation is interrupted to change the revolution speed and the rotation speed of the end mill, and the flow control valve attached to the cutting device is replaced with the flow control valve. It is necessary to manually adjust each time, and there is a problem that work efficiency is reduced.
[0004]
The present invention relates to an attachment device for a road surface cutting device and a work provided with the attachment device, in which a combination of a revolution (movement) speed and a rotation (rotation) speed of a cutting tool can be set so that a state of a cutting surface can be easily selected. Machine.
[0005]
[Means for Solving the Problems]
In order to achieve the above-described object, a road surface cutting attachment device according to the present invention is directed to a cutting tool for cutting a road surface, a rotating device for rotating the cutting tool, and the cutting tool together with the rotating device. And a mode setting device for selectively setting either a “rough cutting mode” in which the roughness accuracy of the cutting surface by the cutting tool is low or a “finishing mode” in which the roughness accuracy of the cutting surface is high. And a control device for controlling the moving device and the rotating device at a speed suitable for each mode.
[0006]
Further, according to the invention of claim 2, the control device is configured to increase a feed speed of the cutting tool by the moving device with respect to a rotation speed of the cutting tool based on a “rough cutting mode” command from the mode setting device. Is output to the moving device.
[0007]
The invention according to claim 3, wherein the control device sends a signal for increasing the rotation speed of the cutting tool with respect to a feed speed of the cutting tool by the moving device based on a "finishing mode" command from the mode setting device. Output to the mobile device.
[0008]
The rotation device is a rotation device that rotates the cutting tool itself, and the moving device is a revolving device that rotates the cutting tool around a predetermined axis together with the rotation device. Things.
[0009]
In the invention of claim 5, the orbiting device further includes a rectilinear moving device for moving the rotating device in the direction of the orbital center.
[0010]
According to a sixth aspect of the present invention, the cutting tool is an end mill, and the revolving device has a central axis guided at the center of a manhole or a lid of the manhole.
[0011]
Further, according to the working machine of the present invention, as in the invention according to claim 7, a revolving body installed rotatably on a traveling body, an articulated arm installed on the revolving body, and a tip of the articulated arm The cutting attachment device according to any one of claims 1 to 6 is mounted on the cutting device.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a road cutting attachment device and a working machine according to the present invention will be described with reference to FIGS. FIG. 1 is a side view showing an embodiment of a working machine in which a road surface cutting attachment device according to the present invention is mounted on the tip of an arm, FIG. 2 is an enlarged side view of the road surface cutting attachment device, and FIG. 3 is a front view of FIG. FIG. 4 is a hydraulic circuit diagram. In FIG. 1, reference numeral 10 denotes a hydraulic working machine based on a hydraulic excavator body. The hydraulic working machine 10 mounts a revolving unit 14 on a wheel type traveling unit 12 (or may be a crawler type) via a revolving unit 13. The cab 15 is installed on the revolving superstructure 14, and the multi-joint arm 11 is attached.
[0013]
Reference numeral 1 denotes a cutting device provided at the tip of the articulated arm 11, which is attached by a hydraulic cylinder 16 so that the angle with respect to the road surface can be adjusted. That is, the cutting device 1 includes a bracket 2 for attaching to the tip of the arm 11, a turning device 3 installed on the bracket 2, an end mill device 30, and a hydraulic cylinder for moving the end mill device 30 in the radial direction of the turning device 3. 6 and a stroke sensor 52 (see FIG. 4) for detecting the movement position of the end mill device 30. Reference numeral 7 denotes a manhole, 8 denotes a guide which is installed in the manhole and has a connection portion with a support shaft 26 described later at the center of the manhole 7, and 9 denotes a pavement surface around the manhole 7.
[0014]
As shown in FIG. 2, the turning device 3 installed on the bracket 2 of the cutting device 1 is rotatably supported by a fixed wheel (outer ring) 18 fixed to the bracket 2 and a ball bearing on the inner peripheral surface of the fixed wheel 18. And a turning motor (inner wheel) 20 having an inner gear on an inner peripheral surface, and a hydraulic motor 17 fixed to an outer wheel 18. A pinion 19 is attached to the output shaft of the hydraulic motor 17. The pinion 19 meshes with an internal gear of the turning wheel 20, and the turning motor 20 can be rotated by the hydraulic motor 17. The hydraulic motor 17 is integrally provided with a tachometer 51 for detecting the rotation speed and an electromagnetic proportional flow control valve 54 for controlling the rotation. The revolving superstructure 4 is fixed to the lower surface of the revolving wheel 20. As shown in FIG. 3, the revolving unit 4 has a gate-shaped cross section, and has a structure that is long in the revolving radius direction of the revolving device 3. Guide rails 21 are provided on inner walls on both sides of the revolving unit 4, and end mill devices 30 are held on the guide rails 21 so as to be movable in the longitudinal direction. The end mill device 30 includes a frame 22, a hydraulic motor 5a fixed to the frame 22, and the end mill 5 rotated by the hydraulic motor 5a. Protrusions 23 project from both sides of the frame 22, and the protrusions 23 are slidably fitted on the guide rails 21. The frame 22 is connected by a pin 25 to the other end of the hydraulic cylinder 6 whose one end is connected to the revolving unit 4 by a pin 24. Therefore, the frame 22, that is, the end mill 5 is moved in the longitudinal direction of the revolving unit 4 by the expansion and contraction operation of the hydraulic cylinder 6. The amount of expansion and contraction of the hydraulic cylinder 6 is detected by a stroke sensor 52.
[0015]
At the center of rotation of the revolving unit 4, there is provided a support shaft 26 which is connected to the guide 8 described above. Make the structure to be. (See Fig. 2)
With the above configuration, the end mill 5 can be revolved around the support shaft 26 by the turning device 3, the end mill 5 can be rotated by the hydraulic motor 5 a, and the revolving radius can be changed by the hydraulic cylinder 6.
[0016]
In FIG. 4, the hydraulic cylinder 6 and the swing motor 17 are connected in parallel to a hydraulic pump 60 as a drive source. Two electromagnetic valves 55 and 56 are provided in series between the hydraulic pump 60, the hydraulic cylinder 6, and the hydraulic motor 17. The electromagnetic valve 55 selectively switches the pressure oil discharged from the hydraulic pump 60 to the hydraulic motor 17 or the hydraulic cylinder 6. The electromagnetic valve 56 controls the operation direction (extension / contraction) of the hydraulic cylinder 6 and the hydraulic motor 17. The direction of rotation (forward / reverse rotation) is switched. An electromagnetic proportional flow control valve 54 is provided between the electromagnetic valve 55 and the hydraulic motor 17. Thereby, the rotation speed of the hydraulic motor 17 is adjusted. Slow return valves 61 and 62 are provided between the electromagnetic valve 55 and the hydraulic cylinder 52. This limits the driving speed of the hydraulic cylinder 6. The hydraulic motor 5a is connected to a hydraulic pump 63 via an electromagnetic proportional flow control valve 53. Thereby, the rotation speed of the hydraulic motor 5a is adjusted. A drive signal is applied to the solenoids of the electromagnetic proportional flow control valves 53 and 54 from a CPU 64 described later. The number of rotations of the hydraulic motor 17 and the number of rotations of the end mill motor 5a are measured by tachometers 50 and 51, respectively, and the amount of expansion and contraction is detected by a stroke sensor 52. The detection signals of the tachometers 50 and 51 and the stroke sensor 52 are applied to the CPU 64 as described later.
[0017]
FIG. 5 is a control block diagram of the cutting attachment device. The mode changeover switch 57, the tachometer 51 of the hydraulic motor 17, the tachometer 50 of the end mill 5, and the stroke sensor 52 of the hydraulic cylinder 6 are connected to the CPU 64, respectively. The rotation speeds of the hydraulic motors 17 and 5a and the amount of expansion and contraction of the hydraulic cylinder 6 are controlled by the signals of the tachometers 50 and 51 and the stroke sensor 52.
[0018]
The mode changeover switch 57 is a switch for switching between “finishing mode” and “rough cutting mode”, and is installed, for example, in a driver's seat. The mode switching is performed by keeping the rotation speed of the end mill 5 constant and switching the revolution speed.
[0019]
At this time, by setting the revolving speed in the “finishing mode” to be lower than that in the “roughing mode”, it is possible to obtain a finer cut section than in the “roughing mode”, and the rotation speed of the end mill 5 in the “finishing mode” Let R1, the revolving speed S1, and the rotation speed R2 and the revolving speed S2 in the “rough cutting mode” satisfy the relationship of (S1 / R1) <(S2 / R2).
[0020]
In accordance with the switched mode, the CPU 64 controls the current supplied from the power source 65 to the electromagnetic proportional flow control valve 54. Accordingly, the speed of the hydraulic motor 17 is controlled by the CPU 64 so that the rotation speed detected by the tachometer 51 becomes a predetermined rotation speed set in advance. The CPU 64 controls the electromagnetic proportional flow control valve 53 to a constant opening to rotate the hydraulic motor 5a of the end mill 5 at a constant speed.
[0021]
A case where the pavement surface 9 around the manhole 7 is cut using the cutting attachment device 1 will be described. At the start of the operation, the “rough cutting mode” is set by the mode switch 57. Accordingly, the roughing drive signal is applied from the CPU 64 to the solenoids of the electromagnetic proportional flow control valves 53 and 54. The spindle 26 of the cutting device 1 is connected to the guide 8 provided in the manhole 7 by running, turning, and operating the articulated arm 11 of the work machine. Thereby, the end mill 5 can revolve along the outer peripheral portion of the manhole 7. In this state or before connecting the support shaft 26 to the guide 8, the hydraulic cylinder 6 is expanded and contracted by the electromagnetic valves 55 and 56 to move the end mill 5 to the outer peripheral position of the manhole 7.
[0022]
Then, the end mill 5 is pressed against the paved surface 9 by operating the articulated arm 11, and the end mill 5 is rotated by the hydraulic motor 5a to cut the paved surface 9 to a predetermined depth. Since the guide 8 has a structure in which the guide 8 allows the vertical movement of the support shaft 26 and prevents the movement in the horizontal direction, the connection depth of the guides 8 is adjusted by the articulated arm 11. Can be done with
[0023]
Subsequently, the hydraulic motor 17 is operated in the “rough cutting mode”, and the end mill 5 is revolved around the support shaft 26 to cut the pavement surface 9 concentrically.
[0024]
When the cutting by the end mill 5 is performed by 360 degrees, the hydraulic motor 17 is stopped once, the hydraulic cylinder 6 is operated, and the cutting radius by the end mill 5 is changed. Then, the hydraulic motor 17 is driven again to perform concentric cutting. By repeating such a cutting operation, the periphery of the manhole 7 is concentrically cut.
[0025]
When finishing the desired cutting in the “rough cutting mode” and finishing the cut surface by the end mill 5, the mode is switched to the “finishing mode” by the mode changeover switch 57. At this time, a finishing drive signal is applied from the CPU 64 to the solenoid portion of the electromagnetic proportional flow control valve 54, and the hydraulic motor 17 rotates at a lower speed than during rough cutting. The roughing drive signal is continuously applied from the CPU 64 to the solenoid portion of the electromagnetic proportional flow control valve 53, and the hydraulic motor 5a is driven at the same rotational speed as during roughing. When the finishing mode is set in this way, the end mill 5 revolves at a low speed, and a clean cross section can be obtained.
[0026]
As another means for realizing each mode, unlike the above-mentioned method, it is also possible to make the revolution speed of the end mill 5 constant and switch the rotation speed.
[0027]
At this time, by setting the rotation speed higher in the “finishing mode” than in the “roughing mode”, it is possible to obtain a finer cut section than in the “roughing mode”, and the rotation speed of the end mill 5 in the “finishing mode” is reduced. Assuming that R1, the revolving speed S1, and the rotation speed R2 and the revolving speed S2 in the “rough cutting mode”, the relationship is (S1 / R1) <(S2 / R2).
[0028]
In this case, the CPU 64 controls the supply current from the power supply 65 to the electromagnetic proportional flow control valve 53 according to the switched mode. Therefore, the speed of the hydraulic motor 17 is controlled by the CPU 64.
[0029]
The CPU 64 controls a current supplied from the power source 65 to the electromagnetic proportional flow control valve 53. Therefore, the speed of the hydraulic motor 17 is controlled by the CPU 64, and the revolution speed of the end mill 5 is controlled to be constant.
[0030]
It is to be noted that the mode changeover switch 57 is not a selection type switch of “finishing mode” and “roughing mode”, but a dial type adjustment lever that can arbitrarily select a degree of finishing is provided, so that various roughnesses can be obtained. It is also possible to obtain a cut section of.
[0031]
Further, an end mill such as a breaker may be directly attached to the tip of a multi-joint arm type working machine capable of controlling the tip of the arm, and the road surface may be cut by the same operation as described above. That is, the trajectory of the multi-joint arm and the upper revolving unit is controlled so that the end mill rotates concentrically a plurality of times around the manhole with different radii.
[0032]
The present invention is applicable not only to asphalt but also to a cutting attachment device for cutting other road surfaces such as concrete, and a cutting attachment for cutting not only around a circular manhole but also around a buried object having various shapes. Also applicable to
[0033]
【The invention's effect】
As described above, according to the road surface cutting attachment device of the present invention and the working machine having the same, in order to realize the required roughness of the cutting surface, the cutting operation is interrupted and a manual flow control valve is used. This eliminates the need to adjust the time, and allows efficient work.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of a working machine in which an attachment device for cutting a road surface according to the present invention is mounted on an end of an arm.
FIG. 2 is an enlarged side view of a main part of FIG.
FIG. 3 is a front view of FIG. 2;
FIG. 4 is a hydraulic circuit diagram of the present invention.
FIG. 5 is a control block diagram of the cutting attachment device of the present invention.
[Explanation of symbols]
1: Cutting device, 2: Bracket, 3: Revolving device, 4: Revolving body, 5: End mill, 5a: Drive device, 6: Hydraulic cylinder, 7: Manhole, 8: Guide, 9: Pavement surface, 10: Hydraulic work , 11: Articulated arm, 12: Wheeled traveling body, 13: Revolving device, 14: Revolving body, 15: Driver's cab, 16: Hydraulic cylinder, 17: Hydraulic motor, 18: Fixed wheel, 20: Revolving wheel, 21: guide rail, 22: frame, 23: ridge, 24: pin, 30: end mill device, 50, 51 tachometer, 52: stroke sensor, 53: electromagnetic proportional flow control valve, 54: electromagnetic proportional flow control Valve, 55: solenoid valve, 56: solenoid valve, 57: mode changeover switch, 60, 63: hydraulic pump, 61, 62: slow return valve, 64: CPU, 65: power supply

Claims (7)

A cutting tool for cutting the road surface,
A rotating device for rotating the cutting tool,
A moving device that moves the cutting tool together with the rotating device,
A mode setting device for selectively setting either the “rough cutting mode” in which the roughness accuracy of the cutting surface by the cutting tool is low or the “finishing mode” in which the roughness accuracy of the cutting surface is high,
A road cutting attachment device comprising: a control device that controls the moving device and the rotating device at a speed suitable for each mode. The road surface cutting attachment device according to claim 1,
The control device outputs a signal to the moving device to increase a feed speed of the cutting tool by the moving device with respect to a rotation speed of the cutting tool based on a “rough cutting mode” command from the mode setting device. Characteristic road surface attachment device. The road surface cutting attachment device according to claim 1,
The control device outputs a signal to the moving device to increase the rotation speed of the cutting tool with respect to a feed speed of the cutting tool by the moving device based on a “finishing mode” command from the mode setting device. Characteristic road surface attachment device. In the attachment device for cutting according to any one of claims 1 to 3,
The rotation device is a rotation device that rotates the cutting tool itself, and the moving device is a revolving device that rotates the cutting tool around a predetermined axis together with the rotation device. Attachment device. The cutting attachment device according to claim 4,
The attachment device for road surface cutting, further comprising a rectilinear moving device for moving the rotation device in a direction of a revolving center in the revolving device. The attachment device for cutting according to claim 4 or 5, wherein the cutting tool comprises an end mill, and a center axis of the revolving device is provided with a center axis guided by a center of a manhole or a lid thereof. Attachment device for road surface cutting. 7. The working machine according to claim 1, further comprising: a revolving unit provided on the revolving unit, the revolving unit being rotatable on the traveling body, and a multi-joint arm provided on the revolving unit. A work machine equipped with a road surface cutting attachment.

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