Road surface cutting machine and road cutting method

Abstract

To provide a road surface cutting machine capable of accurately measuring the weight of cutting debris from shaved pavement on the machine, and a road cutting method using the road surface cutting machine.SOLUTION: In a road surface cutting machine 1 for cutting the surface of a paved road and carrying out cutting debris to the outside, a load measuring device 6 capable of measuring a load in a dynamic state where swinging and vibration exist is arranged on a belt conveyor 4 for carrying out the cutting debris to the outside, and the weight of the cutting debris carried by the belt conveyor 4 is measured, and the measurement results from the load measuring device 6 is accumulated by a totalization processing device 7, and the accumulated weight of the cutting debris is displayed on a display device 8. As a result, the cutting debris can be loaded on a transport vehicle while confirming the accumulated weight, and an appropriate amount of the cutting debris can be loaded according to the maximum loading amount.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a road surface milling machine and a road milling method, and more particularly to a measurement technique and a road milling method for measuring the weight of cutting waste material scraped off the surface of a paved road. [Background technology]

[0002] Road cutting work is known as one of the preventive repair methods to extend the life of paved roads. Road cutting work involves the cutting off and repaving of areas (areas needing repair) that have become continuously uneven on the surface of asphalt pavement, causing the road surface to become extremely uneven. This work aims to restore the road surface shape and the skid resistance of the road surface.

[0003] In this type of road cutting work, the parts that need to be repaired are cut off by a self-propelled road cutting machine (so-called road cutter). As is well known, the road cutting machine is equipped with a self-propelled vehicle with front and rear wheels, a cutting machine attached to the vehicle so that it can ascend and descend, and a conveyor that transports the cutting waste material (cutting material) of the road surface cut by the cutting machine. The cutting waste material cut by the cutting machine is loaded onto a transport vehicle (e.g. a dump truck) outside the machine using the conveyor, and is then transported to a waste disposal site by the transport vehicle.

[0004] In this series of work, since the transport vehicles used to transport the cutting waste materials have a maximum loading capacity, it is desirable to load as much cutting waste material as possible in one transport as close to the maximum loading capacity as possible. By doing so, the total number of transport vehicles required to transport the cutting waste materials can be reduced, and the cost of road cutting work can be reduced.

[0005] However, in conventional road cutting work, there was no way to accurately measure the weight of the cut waste material on site, so the amount loaded onto the transport vehicle was either estimated by eye, or the weight of the cut waste material was calculated and predicted from the road surface cutting distance and the thickness of the pavement to be cut, and the loading amount was determined based on this prediction (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2017-75489 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, such conventional methods have the following problems, and improvements thereto are desired.

[0008] In other words, the conventional method of determining the load on a transport vehicle based on visual estimation or prediction makes it impossible to grasp the exact load. Therefore, in order to avoid overloading, the load must be determined with a target weight less than the maximum load (for example, about 20% less than the maximum load), which creates the problem that the total number of vehicles required to transport cutting waste material for road cutting work is greater than the number actually required.

[0009] In this regard, the applicant investigated the weight of the cutting waste material transported to the waste disposal site and found that the weight of the cutting waste material actually transported to the waste disposal site was only about 10 to 40 percent less than the maximum load capacity of the transport vehicle.

[0010] As such, with the conventional method, up to nearly twice as many transport vehicles were used compared to the number actually required for road cutting work (the appropriate number of vehicles), which posed the problem of excessive operating costs for the transport vehicles used in road cutting work (such as personnel losses and fuel losses due to the increased number of vehicles, and even time losses required to change vehicles).

[0011] The present invention has been made in consideration of these problems, and its object is to provide a road cutting machine and a road cutting method using the same that can accurately measure the weight of the cut waste material of the paved road that has been cut off on the machine. [Means for solving the problem]

[0012] In order to achieve the above-mentioned object, the road cutting machine of the present invention is a road cutting machine that cuts the surface of a paved road and transports cutting waste material to the outside, and comprises a transport device that sets a transport route for transporting the cutting waste material to the outside, a load measuring device capable of measuring load in dynamic conditions where shaking and vibration are present, a calculation processing device that calculates the measurement results of the load measuring device, and a display device that displays the calculation results of the calculation processing device, characterized in that the load measuring device is arranged on the transport route, and the weight of the cutting waste material transported on the transport route is accumulated in the calculation processing device, and the accumulation result is displayed on the display device.

[0013] According to this invention, a load measuring device capable of measuring loads in a dynamic state where shaking and vibration are present is arranged on the discharge path of the cutting waste material, so that the weight of the cutting waste material transported on the discharge path is measured by the load measuring device. The measured weight of the cutting waste material is accumulated in a counting processing device, and the accumulated result is displayed on a display device. Therefore, by checking the accumulated result (accumulated weight value) displayed on the display device, the loading amount (accumulated weight) of the cutting waste material loaded on the transport vehicle can be accurately grasped.

[0014] The road milling machine according to the present invention has the following configuration as a preferred embodiment.

[0015] (1) The conveying device is in the form of a belt conveyor, and the load measuring device is positioned below the forward belt of the belt conveyor and sequentially measures the weight of the cutting waste material placed on the forward belt and conveyed.

[0016] According to this aspect, since a belt conveyor is used as the transport device, the cutting waste material that is continuously cut off while traveling can be continuously transported without interruption. Also, by disposing the load measuring device below the forward belt of the belt conveyor, the load measuring device can be disposed in the empty space that is generated between the forward belt and the return belt due to the structure.

[0017] (2) The load measuring device is characterized by having a sensor block equipped with a measurement unit that optically measures instantaneous displacement of deflection due to load, a base unit that mounts the sensor block to a conveyor frame, and a top plate that is placed on the sensor block and transmits the load applied to the forward belt to the sensor block.

[0018] According to this aspect, the sensor block equipped with the measurement unit is attached to the conveyor frame via the base unit, so that the load measuring device can be disposed at any position on the carry-out path formed by the conveyor.

[0019] (3) The top plate is characterized by including a friction buffer mechanism for reducing frictional resistance with the forward belt.

[0020] According to this aspect, a friction buffer mechanism that reduces frictional resistance with the forward belt is disposed on the top plate of the load measuring device, which is arranged below the forward belt, so that measurement errors due to friction with the forward belt can be reduced when measuring the load of cutting waste material.

[0021] (4) The load measuring device is characterized in that it is disposed in the vicinity of the downstream end of the discharge path.

[0022] According to this aspect, since the load measuring device is disposed near the downstream end of the discharge path, the weight of the cutting waste material can be measured immediately before it is loaded onto the transport vehicle, and therefore the error with respect to the load capacity of the transport vehicle can be made extremely small.

[0023] (5) The display device is characterized in that it is disposed near an operation unit of the transport device.

[0024] According to this embodiment, the transport device can be operated (started / stopped) while grasping (visually checking) the accumulated weight of the cutting waste material transported on the discharge route, and the load of the transport vehicle can be accurately adjusted.

[0025] (6) The above-mentioned tallying and processing device is characterized by comprising a transmitting means for transmitting the tallying results to an external device.

[0026] According to this aspect, the accumulated weight calculated by the calculation processing device can be transmitted to the outside, so that by providing a mobile terminal such as a tablet terminal as a receiving means, it becomes possible to grasp the load of the transport vehicle outside the road cutting machine, for example, from the driver's seat of the transport vehicle or in the construction management office.

[0027] In addition, the road cutting method of the present invention is a road cutting method using a self-propelled road cutting machine, and is characterized in that a load measuring device capable of measuring load in a dynamic state in which shaking and vibration are present is disposed on a transporting device that is equipped on the road cutting machine and loads cutting waste material onto a transporting vehicle, and when the road surface is cut by the road cutting machine, the weight of the cutting waste material transported by the transporting device is continuously measured by the load measuring device, the measured weights are accumulated to calculate an accumulated weight, and the calculated accumulated weight is displayed on a display device, thereby controlling the load amount on the transporting vehicle. Effect of the Invention

[0028] According to the present invention, a load measuring device capable of measuring dynamic load is placed on the discharge path of cutting waste material in a road cutting machine, and the weight of the cutting waste material transported on the discharge path is measured by this load measuring device.The measurement results are then accumulated in a calculation processing device and displayed on a display device, so that the accumulated weight of the cutting waste material being discharged outside the machine via the discharge path can be accurately grasped.

[0029] Therefore, according to the present invention, it becomes possible to transport cutting waste materials up to the maximum loading capacity of the transport vehicle, making it possible to operate with an appropriate number of transport vehicles while minimizing human loss, fuel loss, time loss, etc. [Brief description of the drawings]

[0030] [Figure 1] FIG. 2 is a side view showing the removal of cutting waste material during road cutting work using the road surface cutting machine according to the present invention; [Diagram 2] FIG. 2 is an exploded perspective view showing an example of the external configuration of a load measuring device used in the road surface cutting machine. [Diagram 3] 3(a) is a plan view of the sensor block of the load measuring device, FIG. 3(b) is a side view of the sensor block, FIG. 3(c) is an AA cross-sectional view, and FIG. 3(d) is an enlarged view of a portion surrounded by a dashed line in FIG. 3(b). [Figure 4] 4A, 4B, and 4C are explanatory views showing a schematic configuration of a base unit of the load measuring device, in which FIG. 4A is a plan view, FIG. 4B is a BB cross-sectional view, and FIG. 4C is a bottom view. [Diagram 5] FIG. 2 is a perspective view showing the load measuring device attached to a belt conveyor with the belt cut away. [Figure 6] FIG. 2 is a cross-sectional view of a belt conveyor equipped with the load measuring device. [Figure 7] FIG. 2 is a partially enlarged perspective view showing a portion of a belt conveyor on which the load measuring device is mounted, the portion being cut away. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In addition, the same reference numerals denote the same components or elements throughout the drawings.

[0032] The road surface milling machine 1 of the present invention is a device for scraping off the road surface (surface) RS of a paved road such as asphalt pavement in road cutting work, which is one of the preventive repair methods for paved roads, and as is well known, it mainly comprises a self-propelled vehicle 2 with front and rear wheels, a cutting machine 3 attached to the vehicle 2 so that it can rise and fall, and a belt conveyor (transport device) 4 for transporting the cutting waste material of the road surface scraped off by the cutting machine 3 to the outside of the road surface milling machine 1 (outside the machine), and the cutting waste material of the road surface RS scraped off by the cutting machine 3 is loaded onto a transport vehicle (e.g., a dump truck) DT outside the machine via the belt conveyor 4 (see Figure 1) (

[0033] Here, the vehicle 2 is configured as a self-propelled vehicle equipped with a prime mover (not shown) such as a diesel engine. In the example shown in FIG. 1, the vehicle 2 is configured with a vehicle body 2a having the prime mover, and a working device unit 2b connected to the vehicle body 2a, and the above-mentioned cutting machine 3 is provided on the working device unit 2b so that it can rise and fall. In the illustrated example, a wheeled vehicle equipped with front and rear wheels is exemplified as the vehicle 2, but it may be equipped with caterpillars instead of / in addition to the wheels as long as it is self-propelled. Also, the vehicle body 2a and the working device unit 2b may be configured as one unit.

[0034] The cutting machine 3 is a cutting machine for cutting off the road surface RS, and in this embodiment, a cutting machine having a drum structure (not shown) in which a plurality of cutting bits are arranged on the outer peripheral surface of a substantially cylindrical drum that is rotationally driven by a prime mover is used. The working device section 2b is provided with a lifting mechanism (not shown) for raising and lowering this drum mechanism, and when cutting the road surface RS, the drum is lowered to a cutting position into the road surface RS.

[0035] The belt conveyor 4 is a conveying device that sets a discharge path for discharging the cutting waste material outside the machine, and is arranged so that the end on the base end side (upstream side in the conveying direction) faces the cutting machine 3, and the end on the tip end side (downstream side in the conveying direction) extends outside the road surface cutting machine 1. Specifically, the end on the base end side of the belt conveyor 4 is arranged so that the cutting waste material cut by the cutting machine 3 is automatically placed on the forward belt 32a, and the cutting waste material cut by the cutting machine 3 is sequentially discharged outside the machine by the belt conveyor 4. In addition, the end on the tip side of the belt conveyor 4 protrudes outside the machine so that the cutting waste material falling from the tip is stored in the loading platform of the transport vehicle DT. In the illustrated example, the case where the discharge path for the cutting waste material is configured by one belt conveyor 4 is shown, but the discharge path may be configured by arranging two or more belt conveyors 4 in series.

[0036] The road milling machine 1 is provided with an operation panel 5 for operating the above-mentioned milling machine 3 and belt conveyor 4. The operation panel 5 is provided, for example, on the side of the working device section 2b, and a user can operate the operation panel 5 to perform various controls such as starting / stopping the milling machine 3, controlling the rotation speed of the drum mechanism, controlling the elevation of the drum mechanism, starting / stopping the belt conveyor 4, etc.

[0037] The present invention is an improvement to the road milling machine 1 configured as above, so that the weight of the cutting waste material cut by the cutter 3 can be measured on board the road milling machine 1. In addition to the above-mentioned configuration, the road milling machine 1 of the present invention is equipped with a load measuring device 6 that measures the weight of the cutting waste material, a calculation processing device 7 that calculates the measurement results of the load measuring device 6, and a display device 8 that displays the calculation results of the calculation processing device 7.

[0038] The load measuring device 6 is a device that measures the weight of the cutting waste material placed on the forward belt 32a of the belt conveyor 4 and transported, and in this embodiment, a load measuring device that can measure the load in a dynamic state where there is shaking or vibration (for example, "Dynamic Load Measuring Device" (Patent No. 3090686, Patent No. 5604200) manufactured by Sensing Kyoto Co., Ltd.) is used. This load measuring device 6 calculates the instantaneous load and acceleration from the instantaneous displacement of the elastic part due to the load applied to the device, and instantly measures the weight of the cutting waste material transported by the belt conveyor 4 from these and the vibration acceleration of the device.

[0039] 2 shows the load measuring device 6 used in this embodiment. The load measuring device 6 shown in the figure has a sensor block 11 equipped with a measurement unit 14 that optically measures instantaneous displacement of deflection due to load, a base unit 12 that mounts the sensor block 11 on the conveyor frame 35, and a top plate 13 that is disposed on the sensor block 11 and transmits the load applied to the forward belt 32a to the sensor block 11.

[0040] As shown in FIGS. 3(a) and 3(b), the sensor block 11 is made of a metal block body having a structure in which a central portion 11a in the longitudinal direction is displaceable in the vertical direction.

[0041] Both ends of the sensor block 11 in the longitudinal direction are fixing parts 11b, 11b that fix the sensor block 11 onto the base unit 12. Each fixing part 11b is formed with a plurality of (four in the illustrated example) screw holes 15, 15, ..., and the sensor block 11 is fixed onto the base unit 12 by inserting fixing screws 16, 16, ... into the screw holes 15, 15, ... (see FIG. 2).

[0042] Meanwhile, the central portion 11a of the sensor block 11 has a hollow structure with two horizontal through holes 11c, 11c penetrating the sensor block 11 in the short direction, and the underside is in the form of a recessed portion 11d that is slightly recessed upward. As a result, the sensor block 11, whose both ends in the longitudinal direction are fixed, is held in a bridge-like state with the central portion 11a floating above the base unit 12, and when a load is applied from above, the central portion 11a bends downward while resisting the elasticity associated with the hollow structure.

[0043] A vertical through hole 11e penetrating in the up-down direction is formed in the center 11a of the sensor block 11, more specifically, in the non-hollow portion formed between the horizontal through holes 11c, 11c (see FIG. 3(c)). This vertical through hole 11e is a hole through which a connecting bolt 17 that connects the sensor block 11 and the top plate 13 is inserted, and as shown in FIG. 2, the top plate 13 is attached to the connecting bolt 17 that penetrates and protrudes through this vertical through hole 11e. The upper end side of this vertical through hole 11e is an action part 11h that protrudes upward in a circular ring shape around the hole, and the load applied to the top plate 13 acts on the sensor block 11 via this action part 11h.

[0044] Further, recessed portions 11f and 11g for mounting the measurement unit 14 are formed on the side surface of the sensor block 11. The measurement unit 14 is a unit for optically measuring the instantaneous displacement of the deflection of the sensor block 11 due to a load, and has a sensor arm 18 and a wide mask 19. The sensor arm 18 is an arm-like member having a base end attached to (either one of) recessed portions 11f formed in the fixed portion 11b to form a fixed end, and a tip end as a free end, and is provided with an optical sensor (not shown) at its tip. On the other hand, the wide mask 19 is a mask equipped with a light-emitting portion and a thin light-emitting hole (not shown), and is mounted in the recessed portion 11g of the center portion 11a.

[0045] As a result, the position change (instantaneous displacement) of the wide mask 19 when the center portion 11a of the sensor block 11 receives a load and bends vertically (downward) is detected by the optical sensor of the sensor arm 18. The sensor block 11 is equipped with an arithmetic processing unit (not shown), and is capable of instantly measuring the load (weight) acting on the sensor block 11 based on the instantaneous displacement measured by the measurement unit 14 and the vibration acceleration obtained by an acceleration sensor (not shown, for example, an acceleration sensor attached to the base unit 12).

[0046] The base unit 12 is a metal member for mounting the sensor block 11 to the conveyor frame 35, and as shown in Figure 4, has a sensor accommodating section 21 that accommodates the sensor block 11, and a base section 22 that mounts the sensor accommodating section 21 to a base bracket 28 described later.

[0047] As shown in Fig. 4(a) and (b), the sensor housing 21 is in the form of a substantially rectangular box with an open (opening) upper portion, and in the illustrated example, the sensor housing 21 is adapted to house two sensor blocks 11, 11. More specifically, as shown in Fig. 2, the two sensor blocks 11, 11 are arranged side by side in the short direction of the sensor housing 21. The hatched area 21a in Fig. 4(a) is the arrangement position of the fixing portion 11b of the sensor block 11, and the fixing portion 11b of the sensor block 11 is fixed to this area by screws. Also, the reference symbol 21b is a through hole communicating with the vertical through hole 11e of the sensor block 11, and the connecting bolt 17 is fitted into this through hole 21b from below.

[0048] The base part 22 is a member constituting a base for mounting the sensor accommodating part 21 to the base bracket 28, and in this embodiment, is configured by a frame formed in a substantially V-shape. A U-shaped notch 22a is formed at the end on the pointed side of the V-shape for inserting and mounting the bolt 29 of the base bracket 28, while through holes 22b, 22b are formed at the end on the open side that is opened in two, through which the bolt 29 of the base bracket 28 is inserted. In addition, in FIG. 4(c), the reference symbol 22c denotes a through hole that communicates with the through hole 21b of the sensor accommodating part 21.

[0049] The top plate 13 transmits the load applied to the forward belt 32a to the sensor block 11, and includes, as its main parts, a cover body 25 and a friction buffer mechanism 26 provided on the cover body 25, as shown in FIG.

[0050] The lid 25 is a metal member that constitutes the lid of the sensor housing portion 21, and by attaching this lid 25 to the opening of the sensor housing portion 21, the sensor block 11 is housed inside the sensor housing portion 21. This makes it possible to measure the load without being affected by dust even in a dusty environment such as soil. In addition, a screw hole (not shown) is provided on the back surface (lower surface) of the lid 25, and a connecting bolt 17 is attached to this screw hole.

[0051] The friction buffer mechanism 26 is a mechanism for reducing frictional resistance when the forward belt 32a of the belt conveyor 4 and the top plate 13 come into sliding contact with each other, and in this embodiment, is configured by arranging a plurality of rotating rollers 27, 27, ... on the upper surface of the top plate 13. More specifically, the rotating rollers 27 are supported rotatably via bearings (not shown), and are rotated in the direction of travel of the forward belt 32a by sliding contact with the forward belt 32a, thereby reducing frictional resistance. In this embodiment, a configuration using a plurality of rotating rollers 27, 27, ... is shown as the friction buffer mechanism 26, but other mechanisms, such as a spherical bearing, can be used as long as they can reduce frictional resistance with the forward belt 32a. In the illustrated example, the rotating rollers 27 are arranged in two rows corresponding to the arrangement of the sensor block 11, but the rotating rollers 27 may be arranged in one row.

[0052] 5 shows a state where the load measuring device 6 is attached near the tip of the belt conveyor 4 (at a position near the downstream tip of the conveying path for the cutting waste material) (position X in FIG. 1). As shown in the figure, the load measuring device 6 is disposed below the forward belt 32a of the belt conveyor 4, and sequentially measures the weight of the cutting waste material placed on the forward belt 32a and conveyed.

[0053] Here, the structure of the belt conveyor 4 will be briefly described with reference to FIG. As is well known, the belt conveyor 4 is a device that conveys objects (cutting waste materials in this embodiment) placed on a conveying belt 32 by rotating the conveying belt 32 around a head pulley 31 and a tail pulley (not shown), and a plurality of pulleys, such as a carrier roller 33 that supports the forward belt 32a and a return roller 34 that supports the return belt 32b, are disposed between the head pulley 31 and the tail pulley. These pulleys are attached to a conveyor frame 35 that forms the belt conveyor 4, and all of the other pulleys except for the pulley that serves as the drive pulley (for example, the tail pulley) are mounted on the conveyor frame 35 so as to be freely rotatable.

[0054] In the illustrated example, a stringer frame is used as the conveyor frame 35, in which a pair of vertical frames 35a, 35a made of steel are arranged in the conveying direction, and multiple horizontal frames 35b, 35b, ... made of steel are arranged between the vertical frames 35a, 35a, but a truss frame made of steel may be used. In the illustrated example, the carrier roller 33 has a structure in which rollers are arranged in a V-shape, but the carrier roller 33 may be arranged horizontally. Reference numeral 36 in the figure indicates a support frame that supports a cover (not shown) that covers the belt conveyor 4.

[0055] In this embodiment, the conveyor frame 35 of the belt conveyor 4 configured as above is equipped with a load measuring device 6. Specifically, the load measuring device 6 is disposed in an empty space formed between the horizontal frames 35b, 35b near the leading end of the belt conveyor 4.

[0056] When installing the load measuring device 6, first, the base bracket 28 is attached to the conveyor frame 35. The base bracket 28 is a member that serves as a base for attaching the base unit 12 of the load measuring device 6 to the conveyor frame 35. In this embodiment, an L-shaped steel is used as the base bracket 28, and this L-shaped steel is welded and fixed to the conveyor frame 35 (horizontal frame 35b in the illustrated example).

[0057] The base bracket 28 is a metal fitting having a bolt 29 for mounting the base unit welded in an upright position on one side, and is attached to the conveyor frame 35 so that the bolt 29 stands vertically. In this embodiment, the base part 22 of the base unit 12 is formed with a notch 22a and through holes 22b, 22b that engage with the bolt 29, so that three base brackets 28 are attached to the conveyor frame 35 corresponding to this.

[0058] When mounting the base unit 12, the notch 22a formed on the pointed side of the base portion 22 is inserted into the bolt 29 of one base bracket 28, while the two through holes 22b, 22b formed on the open side are inserted into the bolts 29, 29 of the other base bracket 28, 28, respectively, and finally nuts are attached to each of the bolts 29, 29, 29, so that the base unit 12 is fixed to the conveyor frame 35. In this mounting, the height position of the base unit 12 is adjusted, for example, by interposing a spacer (not shown) between the base bracket 28 and the base unit 12. This height adjustment allows the contact state between the friction buffer mechanism 26 and the forward belt 32a to be adjusted, and the base unit 12 can be placed at a height position suitable for load measurement by the sensor block 11.

[0059] As a result, as shown in Figure 6, a load measuring device 6 is placed below the forward belt 32a, and as the cutting waste material transported by the belt conveyor 4 passes over the load measuring device 6, the calculation processing unit of the load measuring device 6 instantly measures the weight of the passing cutting waste material.

[0060] The tallying processor 7 is a processor electrically connected to the calculation processing unit of the load measuring device 6, and is composed of a microcomputer having a control program for performing the accumulating process described below, display control of the display device 8, etc. In this embodiment, the tallying processor 7 is equipped in the working device unit 2b, and is configured to tally up the weight of the cutting waste material calculated by the calculation processing unit of the load measuring device 6. That is, the tallying processor 7 instantaneously tally up the weight of the cutting waste material continuously transported by the belt conveyor 4 on the road milling machine 1, and calculates the accumulated weight of the cutting waste material carried out by the belt conveyor 4.

[0061] The display device 8 is a device that displays the tallying results of the tallying processing device 7, and in this embodiment, is configured as a display device electrically connected to the tallying processing device 7, such as a liquid crystal display, and displays the accumulated weight of the cutting waste material accumulated by the tallying processing device 7. In addition, in this embodiment, the display device 8 is disposed near the operation panel 5 that constitutes the operation part of the belt conveyor 4, and the operator of the road milling machine 1 can operate the operation panel 5 while visually checking the accumulated weight displayed on the display device 8. In other words, the operator of the road milling machine 1 can perform loading work while checking the accumulated weight of the cutting waste material loaded onto the transport vehicle DT via the belt conveyor 4, and the operator of the road milling machine 1 can control the loading capacity of the transport vehicle DT to an optimal loading capacity according to the maximum loading capacity.

[0062] Next, road cutting work using the road surface cutting machine 1 configured as above will be described with reference to FIG.

[0063] In the road milling work according to the present invention, the road surface RS of a paved road is milled while the road milling machine 1 is self-propelled. In the illustrated example, a transport vehicle DT is placed ahead in the traveling direction F, and the transport vehicle DT is moved forward in accordance with the progress of the road milling machine 1.

[0064] When moving forward, the operator of the road milling machine 1 operates the control panel 5 to start the cutter 3, set the height position of the cutter 3 (drum mechanism), and start the belt conveyor 4. As a result, as the road milling machine 1 moves forward, cutting of the road surface RS of the paved road by the cutter 3 begins, and the cutting waste material cut off by the cutter 3 is continuously placed one after another on the base end of the belt conveyor 4. The cutting waste material placed on the belt conveyor 4 is then transported towards the tip of the belt conveyor 4, and the cutting waste material that reaches the tip falls in order and is loaded onto the loading platform of the transport vehicle DT.

[0065] At this time, the road surface milling machine 1 has a load measuring device 6 arranged directly below the belt 32 on the discharge path set by the belt conveyor 4 (in this embodiment, near the end of the belt conveyor 4), so that the weight of the cutting waste material transported on the discharge path is continuously measured by the load measuring device 6, and the measured weight is accumulated in the calculation processing device 7, and the accumulated weight of the cutting waste material is displayed on the display device 8.

[0066] Therefore, the operator of the road milling machine 1 can accurately grasp the loading amount onto the transport vehicle DT by checking the calculation result displayed on the display device 8. Therefore, according to the road milling method of the present invention, the operator of the road milling machine 1 can load the transport vehicle DT with cutting waste material up to its maximum loading amount (control the loading amount) by checking the display device 8 when loading cutting waste material onto the transport vehicle DT. As a result, with regard to the operation of the transport vehicle DT in road milling work, it is possible to operate the transport vehicle DT with an appropriate number of transport vehicles DT, minimizing human loss, fuel loss, time loss, and the like, and it is possible to significantly reduce the costs associated with road milling work.

[0067] It should be noted that the above-described embodiments are merely preferred embodiments of the present invention, and the present invention is not limited to these, and various design modifications are possible within the scope of the present invention.

[0068] For example, in the above-described embodiment, the load measuring device 6 is placed near the downstream end of the belt conveyor 4 (position indicated by symbol X in Figure 1), but the load measuring device 6 may be placed anywhere on the discharge path of the cutting waste material, and can also be placed, for example, in the middle of the belt conveyor 4 or near the upstream end of the belt conveyor 4 close to the cutting machine 3.

[0069] In the above embodiment, the display device 8 is disposed near the operation panel 5, but the location of the display device 8 can be changed as appropriate. For example, the display device 8 can be disposed in the driver's seat of the road milling machine 1. In the above embodiment, the tallying device 7 and the display device 8 are connected by wire, but the display device 8 can be disposed outside the road milling machine 1 by providing the tallying device 7 with a wireless communication device (transmission means) that transmits the tallying results to the outside. Furthermore, it is also possible to use, for example, the display unit of a smartphone or tablet terminal, which is a portable terminal device capable of wireless communication, as the display device 8.

[0070] In the above embodiment, the sensor block 11 of the load measuring device 6 is a block body having both longitudinal ends fixed as the fixed parts 11b, 11b and a central part 11a displaceable in the vertical direction, but it may be a cantilever block body having only one longitudinal end fixed as the fixed part. In the above embodiment, the instantaneous vertical displacement caused by the load is detected by the wide mask 19 and the optical sensor of the sensor arm 18, but it may be configured to detect the instantaneous displacement caused by the load by another method. In short, it is possible to use a load measuring device 6 having a different configuration as long as it is capable of measuring the load in a dynamic state where there is shaking or vibration. [Explanation of symbols]

[0071] 1 Road milling machine 2 Vehicles 2a Vehicle body 2b Working equipment section 3 cutting machine 4. Belt conveyor (transport device) 5 Control panel 6. Load measuring device 7. Data collection and processing device 8 Display device 11 Sensor block 12 Base Unit 13 Top Plate 14 Measurement Units 18 Sensor arm 19 Wide Mask 21 Sensor housing 22 Base 25 Lid 26 Friction buffer mechanism 28 Base bracket 31 Head pulley 32 Belt 32a Outbound belt 32b Return belt 33 Carrier roller RS road surface (surface) DT Transport Vehicle

Claims

1. A road milling machine that mills the surface of a paved road and transports the milled waste material to the outside, A conveying device that sets a conveying path for conveying the cutting waste material to the outside; A load measuring device capable of measuring loads in a dynamic state where shaking or vibration is present; a counting processing device that counts the measurement results of the load measuring device; a display device that displays the tallying result of the tallying processing device, The load measuring device is disposed on the discharge path, and the weight of the cutting waste material transported on the discharge path is accumulated in the tallying processing device, and the accumulated result is displayed on the display device. A road milling machine characterized by:

2. The conveying device is in the form of a belt conveyor; The load measuring device is disposed under the forward belt of the belt conveyor and sequentially measures the weight of the cutting waste material placed on the forward belt and transported.

2. A road milling machine according to claim 1.

3. The load measuring device includes a sensor block equipped with a measurement unit that optically measures instantaneous displacement of deflection due to a load, a base unit that mounts the sensor block to a conveyor frame, and a top plate that is disposed on the sensor block and transmits the load applied to the forward belt to the sensor block.

3. A road milling machine according to claim 2.

4. The top plate is provided with a friction buffer mechanism for reducing frictional resistance with the forward belt.

4. A road milling machine according to claim 3.

5. The load measuring device is disposed in the vicinity of the downstream end of the discharge path.

5. A road milling machine according to claim 2, wherein the first and second cutting members are arranged in a first direction.

6. The display device is disposed near an operation unit of the transport device.

5. A road milling machine according to claim 2, wherein the first and second cutting members are arranged in a first direction.

7. The tallying processing device includes a transmitting means for transmitting the tallying results to an external device.

5. A road milling machine according to claim 2, wherein the first and second cutting members are arranged in a first direction.

8. In road cutting method using a self-propelled road cutting machine, A load measuring device capable of measuring load in a dynamic state where shaking or vibration is present is disposed on a transport device provided on the road surface milling machine and used to load the cutting waste material onto a transport vehicle; During road cutting by the road cutting machine, the weight of the cutting waste material transported by the transport device is continuously measured by the load measuring device, and the measured weights are integrated to calculate an integrated weight; The calculated integrated weight is displayed on a display device to control the load on the transport vehicle. A road cutting method characterized by the above.

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