Road surface cutting machine and waste material amount measuring device

Abstract

To provide a road surface cutting machine and a waste material amount measuring device that can manage the amount of waste material discharged by the road surface cutting machine with a simple structure.SOLUTION: A road surface cutting machine 100 is equipped with a belt conveyor 164, and discharges outside waste material R of asphalt cut from the road surface with the belt conveyor 164. The machine includes: a sensor disposed above a belt 168 of the belt conveyor 164 for continuously measuring the height of the waste material R with the upper surface of the belt 168 being the reference; and a calculation part that calculates the amount of the waste material R based on the area of the waste material R calculated based on the height of the waste material R and the amount of movement of the belt 168.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a road surface cutting machine and a waste material measuring device.

Background Art

[0002] Conventionally, when repairing asphalt pavement or the like, a road surface cutting machine for cutting asphalt pavement is known (see, for example, Patent Document 1). The road surface cutting machine is provided with a belt conveyor, and discharges the cut waste asphalt material by the belt conveyor. The waste material discharged by the road surface cutting machine is transferred to the loading platform of a dump truck for carrying and then carried to a treatment site.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The amount of waste material transferred from the road surface cutting machine to the loading platform of the dump truck must be within the range of the maximum loading capacity of the dump truck. As a method of managing the amount of waste material, for example, a method of attaching sensors for measuring the depth, width, and extension of the cutting range to the road surface cutting machine and calculating the cutting volume from the detection values of these sensors can be mentioned. However, in this method, since a large number of sensors are attached to the road surface cutting machine, a complicated attachment structure is required, and there is a problem that the calculation of the cutting volume becomes complicated. Therefore, an object of the present invention is to provide a road surface cutting machine and a waste material measuring device that solve the above problems, have a simple structure, and can manage the amount of waste material discharged by the road surface cutting machine.

Means for Solving the Problems

[0005] Aspects of the present invention relate to a road milling machine that includes a belt conveyor and discharges waste material of milled asphalt to the outside using the belt conveyor. A sensor is disposed above the belt of the belt conveyor to continuously measure the height of the waste material with reference to the upper surface of the belt. A calculation unit is provided to calculate the amount of the waste material based on the area of the waste material calculated based on the height of the waste material and the amount of movement of the belt.

Advantages of the Invention

[0006] According to the present invention, by detecting the height of the waste material conveyed on the belt of the belt conveyor, it is possible to manage the amount of waste material with a simple structure.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0008] [1. Configuration of Road Milling Machine] Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side view of a road milling machine (road cutter) 100 to which the present embodiment is applied. FIG. 1 shows a dump truck 300 used together with the road milling machine 100.

[0009] The road surface cutting machine 100 is a device for cutting and peeling off the asphalt mixture layer 400 laid on the roadbed of a road or a concrete floor slab. The road surface cutting machine 100 includes a self-propelled vehicle 120, a cutting drum 140 disposed at the bottom of the self-propelled vehicle 120, and a conveyor unit 160 for conveying the waste material R of the asphalt mixture layer 400.

[0010] The road surface cutting machine 100 cuts the asphalt mixture layer 400 while traveling in the direction indicated by the arrow F in the figure by the power of the power source mounted on the self-propelled vehicle 120. The traveling direction indicated by the arrow F is defined as the front of the road surface cutting machine 100. The road surface cutting machine 100 discharges the waste material R generated by cutting the asphalt mixture layer 400 by means of a conveyor unit 160 extending in front of the self-propelled vehicle 120. A dump truck 300 is waiting below the conveyor unit 160, and the waste material R is transferred from the conveyor unit 160 to the loading platform 310 of the dump truck 300.

[0011] A pair of steerable front wheels 122 including, for example, rubber tires and wheels are attached to the lower front part of the self-propelled vehicle 120. Two pairs of left and right rear wheels 124 including, for example, rubber tires and wheels are attached to the lower rear part of the self-propelled vehicle 120. Further, a diesel engine as a power source (not shown) is mounted at a predetermined position behind the self-propelled vehicle 120, and an engine hood covering the upper surface and both side surfaces thereof is attached so as to be openable and closable. Furthermore, an operator's cab 126 for the road surface cutting machine 100 is provided on the central upper surface of the self-propelled vehicle 120.

[0012] The diesel engine mounted on the self-propelled vehicle 120 generates hydraulic pressure for operating various hydraulic devices and drives the front wheels 122 and the rear wheels 124 of the self-propelled vehicle 120. Here, the front wheels 122 and the rear wheels 124 may be driven hydraulically.

[0013] The cutting drum 140 is disposed at the center of the self-propelled vehicle 120 with its rotation axis extending in the left-right direction of the self-propelled vehicle 120. A plurality of cutter bits (not shown) are arranged on the outer peripheral surface of the cutting drum 140. The cutter bits are detachably attached to the cutting drum 140. Then, the cutting drum 140 is rotationally driven by a power source of the self-propelled vehicle 120 via, for example, a belt or a chain, and the cutter bits attached to its outer peripheral surface cut the asphalt mixture layer 400.

[0014] The self-propelled vehicle 120 includes a first hydraulic cylinder (not shown) that supports the cutting drum 140 and a second hydraulic cylinder. The first hydraulic cylinder is disposed so as to be extendable and retractable in the left-right direction of the self-propelled vehicle 120, and the second hydraulic cylinder is disposed so as to be extendable and retractable in the up-down direction of the self-propelled vehicle 120. The cutting drum 140 is disposed so as to be movable in the left-right direction and the up-down direction with respect to the self-propelled vehicle 120 by these first and second hydraulic cylinders.

[0015] Therefore, by appropriately controlling the supply and discharge of hydraulic oil to the first cylinder, the cutting drum 140 can be moved in the left-right direction with respect to the self-propelled vehicle 120, and for example, the asphalt mixture layer 400 can be cut across the width of the road. Also, by appropriately controlling the supply and discharge of hydraulic oil to the second cylinder, the cutting drum 140 can be moved in the up-down direction with respect to the self-propelled vehicle 120, and the cutting depth of the asphalt mixture layer 400 can be arbitrarily changed. Note that the second hydraulic cylinder is an example of an actuator that moves the cutting drum in the up-down direction with respect to the self-propelled vehicle.

[0016] The conveyor unit 160 includes a central conveyor 162 attached so as to obliquely penetrate the front lower part of the self-propelled vehicle 120 and a belt conveyor 164 attached to the front part of the self-propelled vehicle 120 so as to be rotatable in the left-right direction and the up-down direction.

[0017] The central conveyor 162 is composed of, for example, a belt conveyor covered by a cover all around, receives the waste material R of the asphalt mixture layer 400 cut by the cutting drum 140, and conveys it to above the front of the self-propelled vehicle 120.

[0018] The belt conveyor 164 is covered by a cover all around, for example, and is provided with a mechanism for circulating and driving an endless belt 168. The belt conveyor 164 places the waste material R conveyed by the central conveyor 162 on the belt 168, further conveys it to the upper front, and loads it onto the loading platform 310 of the dump truck 300 traveling in front of the road surface cutting machine 100.

[0019] At the bottom of the self-propelled vehicle 120, a pair of left and right electromagnetic wave radars 150 for measuring the thickness of the asphalt mixture layer 400 before being cut by the cutting drum 140 are arranged. As shown in FIG. 1, the pair of left and right electromagnetic wave radars 150 are arranged at positions in front of the cutting drum 140 and facing the left and right end portions of the cutting drum 140 with reference to the traveling direction of the self-propelled vehicle 120. Therefore, the electromagnetic wave radar 150 can measure the thickness of the asphalt mixture layer 400 at the left and right end portions of the cutting drum 140.

[0020] The electromagnetic wave radar 150 measures the thickness of the asphalt mixture layer 400 by utilizing the difference in electrical properties (relative permittivity, conductivity) between the roadbed or concrete slab located below the asphalt mixture layer 400 and the asphalt mixture layer 400. Specifically, the electromagnetic wave radar 150 includes a transmitting antenna and a receiving antenna, and irradiates electromagnetic waves in the microwave band into the asphalt mixture layer 400 through the transmitting antenna. The electromagnetic wave radar 150 receives, through the receiving antenna, the electromagnetic waves reflected at the interface between the roadbed or concrete slab located below the asphalt mixture layer 400 and the asphalt mixture layer 400. The electromagnetic wave radar 150 measures the thickness of the asphalt mixture layer 400 based on the time (reflection time) from when the electromagnetic waves are irradiated until they are received. Note that the thickness of the asphalt mixture layer 400 may be calculated by an arithmetic circuit built into the electromagnetic wave radar 150, or may be calculated by an external arithmetic circuit or the like connected to the electromagnetic wave radar 150.

[0021] A moving amount measuring unit (not shown) is arranged in the road surface cutting machine 100. The moving amount measuring unit is, for example, an encoder that detects the rotation amount of the front wheel 122 or the rear wheel 124, or includes GNSS (Global Navigation Satellite System) and measures the traveling distance of the self-propelled vehicle 120. Although not shown in the drawings, the road surface cutting machine 100 includes a display device that visually notifies the operator of the road surface cutting machine 100 of the thickness of the asphalt mixture layer 400. As this display device, a liquid crystal monitor or the like can be used.

[0022] The road surface cutting machine 100 includes a waste material measuring device 200. The waste material measuring device 200 is a device that measures the amount of waste material R discharged by the road surface cutting machine 100. The waste material measuring device 200 includes a sensor unit 210 and a control unit 250.

[0023] The sensor unit 210 is disposed at the conveyor tip portion 166 which is the tip of the belt conveyor 164. The sensor unit 210 includes a sensor 220 (FIG. 2) described later, and the sensor 220 detects waste material R transferred from the conveyor tip portion 166 to the loading platform 310 of the dump truck 300. The control unit 250 calculates the amount of the waste material R based on the detection value in the sensor unit 210. The control unit 250 includes a display unit 282 (FIG. 4) that displays the calculated amount of the waste material R and the like. The control unit 250 is installed on the driver's cab 126 so that, for example, the operator of the road milling machine 100 can easily view the display unit 282.

[0024] [2. Configuration of Sensor Unit] FIG. 2 is a front view of the sensor unit 210. FIG. 3 is a side view of the sensor unit 210. FIGS. 2 and 3 show the installation state of the sensor unit 210 at the conveyor tip portion 166, and also show the configuration of the conveyor tip portion 166 for the purpose of illustration.

[0025] FIGS. 2 and 3 show the X-axis, Y-axis, and Z-axis. The X-axis, Y-axis, and Z-axis are orthogonal to each other. The Z-axis corresponds to the vertical direction of the conveyor tip portion 166, the Y-axis corresponds to the width direction of the conveyor tip portion 166, that is, the belt 168, and the X-axis corresponds to the front-rear direction of the conveyor tip portion 166. The positive direction of the Z-axis is upward, the positive direction of the X-axis is rearward, and the positive direction of the Y-axis is leftward.

[0026] A pair of guards 172 are disposed on the left and right side surfaces of the conveyor tip portion 166, and a pulley 174 is disposed between the pair of guards 172. A belt 168 is wound around the pulley 174 to support the belt 168 at the folding position of the belt 168. Shafts 176 that support the pulley 174 project from the left and right ends of the pulley 174, respectively.

[0027] A bearing unit 178 is fixed to a guard 172 by a fixing bar 180. The tip of a shaft 176 is fitted into the bearing unit 178, and the bearing unit 178 rotatably supports the shaft 176. The bearing unit 178 may be configured to include a motor and rotationally drive the shaft 176.

[0028] As shown in FIG. 3, the shaft 176 passes through a long hole 182 formed in the guard 172 and is fitted into the bearing unit 178. The bearing unit 178 is connected to the guard 172 via fixing bars 180 disposed above and below it. The shaft 176 is movable in the front - rear direction along the long hole 182, and by loosening the connection between the fixing bar 180 and the bearing unit 178, the shaft 176 can be moved in the front - rear direction together with the bearing unit 178. By moving the shaft 176, for example, the tension of the belt 168 can be adjusted.

[0029] A sensor unit 210 includes a sensor 220, a sensor bracket 230 that supports the sensor 220, a support plate 232 that fixes the sensor bracket 230 to the guard 172, and a pair of support legs 234. The pair of support legs 234 are fixed to the left and right guards 172 respectively. The support legs 234 extend above the guard 172. The support plate 232 is connected across the left and right support legs 234 and supports the sensor bracket 230 in a suspended state.

[0030] The sensor bracket 230 supports the sensor 220 such that the tip of the sensor 220 faces the belt 168. Thereby, a plurality of sensors 220 are arranged side by side in the width direction of the belt 168. Also, the tip of each sensor 220 faces the belt 168 perpendicularly to the plane of the belt 168.

[0031] The position of the sensor unit 210 in the front - rear direction of the belt 168 is arbitrary. For example, as shown in FIG. 3, the axis center of the shaft 176 and the center of the sensor 220 can be set at the same position in the X direction.

[0032] Sensor 220 is a distance sensor that detects the distance between an object facing its tip and the sensor 220. For the sensor 220, for example, an ultrasonic sensor can be used. The sensor 220 includes an ultrasonic element that transmits ultrasonic waves and receives reflected waves from the object, and detects the distance from the tip of the sensor 220 to the object based on the time from transmission to reception.

[0033] A sensor base 225 is attached to the sensor 220. The sensor base 225 houses a drive circuit that drives the sensor 220 and a control circuit that measures the time from when the sensor 220 transmits ultrasonic waves until it receives them and calculates the distance based on the measured time.

[0034] In the present embodiment, the tip of the sensor 220 faces perpendicularly to the plane of the belt 168. As shown in FIG. 2, when detection is performed by the sensor 220 with no waste material R on the belt 168, the distance H1 from the tip of the sensor 220 to the upper surface of the belt 168 is detected. When detection is performed by the sensor 220 during the conveyance of the waste material R, the distance H2 from the tip of the sensor 220 to the upper end of the waste material R is detected. From the difference between the distance H1 and the distance H2, the height H3 of the waste material R on the belt 168 directly below the sensor 220 is obtained.

[0035] The sensor unit 210 detects the distances H1 and H2 by a plurality of sensors 220 arranged side by side in the width direction of the belt 168. The control unit 250 can approximately calculate the cross-sectional area A of the waste material R on the belt 168 based on the detection results of the plurality of sensors 220. The cross-sectional area A corresponds to the area of the cross-section obtained by cutting the waste material R on the belt 168 at the positions of the sensors 220 in the front-rear direction indicated by the X-axis. By multiplying the cross-sectional area A by the moving amount of the belt 168, the volume of the waste material R conveyed by the belt 168 can be obtained.

[0036] [3. Configuration of Control Unit] FIG. 4 is a block diagram of the waste material measuring device 200. With reference to FIG. 4, the configuration of the control unit 250 included in the waste material measuring device 200 will be described.

[0037] The control unit 250 of the waste material measurement device 200 includes a control section 260 and a storage section 270. The control section 260 includes a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processor Unit), and controls each part of the waste material measurement device 200 by executing a program. The storage section 270 includes a volatile storage area or a non-volatile storage area, and stores programs and data. The storage section 270 may constitute the work area of the processor of the control section 260.

[0038] The processor of the control section 260 may be either a single processor or a plurality of processors, or may be programmed hardware. Further, the above processor may be constituted by an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). Further, the control section 260 may be an integrated IC including a processor and a memory.

[0039] The control section 260 of the present embodiment includes a detection control section 261, a calculation section 262, and an output control section 263. These are constituted by the processor of the control section 260 executing a program. The storage section 270 stores reference distance data 271, cross-sectional area calculation data 272, mass conversion coefficient 273, cross-sectional area data 274, volume value data 275, and mass value data 276.

[0040] An operation section 281, a display section 282, and an I / F (interface) 283 are connected to the control section 260. The operation section 281 includes operators such as switches and buttons operated by an operator. The operation section 281 receives an operation by the operator and outputs data or signals indicating the operation content to the control section 260. The display section 282 includes a liquid crystal display panel, an LED (Light Emitting Diode) indicator, a 7-segment LED, or other display bodies. The display section 282 displays numerical values, characters, or images according to the control of the control section 260.

[0041] I / F283 connects the sensor 220 and the movement measurement unit 128 to the control unit 260. Each sensor 220 provided in the sensor unit 210 is connected to I / F283.

[0042] The movement measurement unit 128 is a device that measures the length that the belt 168 has moved, that is, the movement amount, and is installed on the belt conveyor 164. The movement measurement unit 128 periodically outputs the movement amount of the belt 168 at a preset cycle. I / F283 outputs data indicating the movement amount output by the movement measurement unit 128 to the control unit 260.

[0043] The reference distance data 271 and the cross-sectional area calculation data 272 stored in the storage unit 270 are data for the control unit 260 to calculate the cross-sectional area A. Specifically, the reference distance data 271 is data indicating the distance H1. The reference distance data 271 includes the value of the distance H1 corresponding to each sensor 220 provided in the sensor unit 210.

[0044] The cross-sectional area calculation data 272 includes data, functions, coefficients, programs, etc. for approximately calculating the cross-sectional area A from the height H3 corresponding to the number of sensors 220 and the positions of the respective sensors 220 in the width direction of the belt 168.

[0045] The mass conversion coefficient 273 is a coefficient for converting the volume of the waste material R into the mass of the waste material R. The storage unit 270 may store a plurality of mass conversion coefficients 273. For example, the storage unit 270 may store the mass conversion coefficients 273 for each composition and type of asphalt pavement. In this case, the control unit 260 selects and uses the mass conversion coefficient 273 corresponding to the asphalt mixture layer 400 cut by the road surface cutting machine 100.

[0046] The detection control unit 261 controls the sensor 220 to perform detection. The detection control unit 261 repeatedly causes the sensor 220 to perform detection at a preset period and acquires detection values. Further, the detection control unit 261 acquires the movement amount output by the movement amount measurement unit 128.

[0047] The calculation unit 262 calculates the amount of waste material R transferred from the belt conveyor 164 to the loading platform 310. Specifically, the calculation unit 262 calculates the height H3 corresponding to the detection position of each sensor 220 based on the detection value of the sensor 220 and the reference distance data 271. The calculation unit 262 calculates the cross-sectional area A of the waste material R on the belt 168 based on the height H3 using the cross-sectional area calculation data 272. The calculation unit 262 stores the calculated value of the cross-sectional area A in the storage unit 270 as cross-sectional area data 274. When the storage unit 270 already stores the cross-sectional area data 274, the calculation unit 262 updates the cross-sectional area data 274 every time the cross-sectional area A is calculated.

[0048] The calculation unit 262 calculates the volume of the waste material R conveyed by the belt 168 based on the cross-sectional area A and the movement amount of the belt 168 measured by the movement amount measurement unit 128. The calculation unit 262 updates the volume value data 275 stored in the storage unit 270 based on the calculated value of the volume of the waste material R. The volume value data 275 indicates the cumulative value obtained by accumulating the volume of the waste material R calculated by the calculation unit 262. In other words, the volume value data 275 indicates the integrated value of the volume of the waste material R transferred to the loading platform 310.

[0049] The calculation unit 262 may perform a process of converting the volume value of the waste material R indicated by the volume value data 275 into the weight of the waste material R. Specifically, the mass of the waste material R transferred to the loading platform 310 may be calculated by multiplying the volume value of the waste material R by the mass conversion coefficient 273.

[0050] The output control unit 263 causes the display unit 282 to display numerical values and the like based on the cross-sectional area data 274, the volume value data 275, and the mass value data 276.

[0051] FIG. 5 is a front view of the control unit 250. The control unit 250 is installed on the operator's cab 126. Therefore, the operator of the road surface cutting machine 100 can operate the control unit 250 and check the display.

[0052] On the front surface of the control unit 250, a power switch 291, a reset switch 292, a level display section 295, a cross-sectional area display section 296, an integrated quantity display section 297, and a notification display section 298 are arranged.

[0053] The power switch 291 is an operator for instructing the on and off of the power supply of the waste material measuring device 200. Further, the power switch 291 may function as an operator for instructing the start of measurement of the amount of the waste material R to the control unit 260. Specifically, according to the operation of the power switch 291, the control unit 260 may start the measurement of the waste material R. The two functions of the power switch 291 can be switched, for example, by the time the operator presses the power switch 291.

[0054] The reset switch 292 is an operator for instructing the initialization of the integrated quantity of the volume value of the waste material R, that is, the volume value data 275. Further, the reset switch 292 may function as an operator for instructing the measurement of the distance H1 to the control unit 260. Specifically, according to the operation of the reset switch 292, the control unit 260 may execute the detection by the sensor 220 and store the detected distance in the storage unit 270 as the reference distance data 271. The two functions of the reset switch 292 can be switched, for example, by the time the operator presses the reset switch 292. The power switch 291 and the reset switch 292 are an example of constituting the operation unit 281.

[0055] The level display section 295, the cross-sectional area display section 296, and the integrated quantity display section 297 display numerical values by a liquid crystal display panel or a 7-segment LED. The level display section 295, the cross-sectional area display section 296, and the integrated quantity display section 297 are an example of constituting the display section 282.

[0056] The level display unit 295 displays the height of the waste material R on the belt 168. The output control unit 263 causes the level display unit 295 to display a numerical value corresponding to the height H3 calculated by the calculation unit 262. Specifically, the output control unit 263 converts the plurality of heights H3 calculated based on the detection values of the plurality of sensors 220 into one index value, conversion value, or reference value and causes the level display unit 295 to display it, or causes the level display unit 295 to display the average value of the plurality of heights H3.

[0057] The cross-sectional area display unit 296 displays the cross-sectional area A. The output control unit 263 causes the cross-sectional area display unit 296 to display the value of the cross-sectional area data 274 or an index value corresponding to the value of the cross-sectional area data 274. The output control unit 263 updates the display of the cross-sectional area display unit 296 every time the calculation unit 262 updates the cross-sectional area data 274.

[0058] The output control unit 263 causes the integrated quantity display unit 297 to display the value of the volume value data 275 or the mass value data 276, or an index value corresponding to these values. The output control unit 263 updates the display of the integrated quantity display unit 297 every time the calculation unit 262 updates the volume value data 275 or the mass value data 276.

[0059] The notification display unit 298 is a display unit that notifies that the amount of the waste material R transferred to the loading platform 310 has reached a preset value. The notification display unit 298 is, for example, an LED indicator. The output control unit 263 turns on or blinks the notification display unit 298 when the value of the volume value data 275 or the mass value data 276 reaches the preset value. This preset value is, for example, preset in advance and stored in the storage unit 270.

[0060] The configuration shown in FIG. 5 is an example. The control unit 250 may be configured to be able to display, for example, on one liquid crystal display panel, displays corresponding to the level display unit 295, the cross-sectional area display unit 296, the integrated quantity display unit 297, and the notification display unit 298. Further, the control unit 250 may include a buzzer or a speaker that outputs a sound together with the lighting or blinking of the notification display unit 298.

[0061] [Operation of Scrap Measurement Device] FIG. 6 is a flowchart showing the operation of the scrap measurement device 200. Steps S11 to S15 and S21 in FIG. 6 are executed by the detection control unit 261, steps S16 to 18 are executed by the calculation unit 262, and steps S19 to S20 are executed by the output control unit 263.

[0062] When the control unit 250 detects an operation of the reset switch 292 (step S11), it causes the sensor 220 to perform detection and acquires a detection value (step S12). The control unit 250 generates reference distance data 271 from the acquired detection value and stores the reference distance data 271 in the storage unit 270 (step S13).

[0063] The control unit 250 waits until a measurement start is instructed (step S14), and when a measurement start is instructed (step S14: YES), it causes the sensor 220 to perform detection and acquires a detection value (step S15).

[0064] The control unit 250 calculates the cross-sectional area A (step S16). In step S16, the control unit 250 calculates the height H3 at the detection position of each sensor 220 based on the detection values of the plurality of sensors 220 and the reference distance data 271, and calculates the cross-sectional area A from the height H3 using the cross-sectional area calculation data 272. The control unit 250 updates the cross-sectional area data 274 stored in the storage unit 270 with the calculated cross-sectional area A.

[0065] The control unit 250 calculates the volume of the scrap R based on the value of the cross-sectional area A calculated in step S17 and the moving amount of the belt 168 output by the moving amount measurement unit 128 (step S17).

[0066] The control unit 250 updates the volume value data 275 by adding the value of the volume of the scrap R calculated in step S18 to the volume value data 275 stored in the storage unit 270 (step S18).

[0067] The control unit 250 determines whether the value of the volume value data 275 added in step S18 has reached the set value (step S19). When the control unit 250 determines that the value of the volume value data 275 has reached the set value (step S19: YES), it executes notification (step S20). The mode of notification is, for example, an operation of lighting or flashing the notification display unit 298, but a sound may also be output. Thereafter, the control unit 250 proceeds to step S21. Also, when the control unit 250 determines that the value of the volume value data 275 has not reached the set value (step S19: NO), it skips step S19 and proceeds to step S21.

[0068] In step S21, the control unit 250 determines whether an instruction to end the measurement has been given (step S21). If an instruction to end the measurement has not been given (step S21: NO), the control unit 250 returns to step S15. Thereby, detection by the sensor 220 and calculation of the cross-sectional area A and the volume of the waste material R are performed at a predetermined cycle. If an instruction to end the measurement has been given (step S21: YES), the control unit 250 ends this process. The instruction to end the measurement is, for example, an operation of the power switch 291.

[0069] In steps S16 and S18, every time any of the cross-sectional area data 274, the volume value data 275, and the mass value data 276 is updated, the control unit 250 updates the display on the display unit 282.

[0070] After updating the volume value of the waste material R in step S18, the control unit 250 may calculate the mass of the waste material R using the mass conversion coefficient 273 and update the mass value data 276. In this case, the control unit 250 may determine in step S19 whether the mass of the waste material R indicated by the mass value data 276 exceeds the set value. That is, the set value may be a set value regarding the mass of the waste material R.

[0071] In the determination in step S19, the control unit 250 may compare the volume or mass of the waste material R calculated by the control unit 250 with a value including a margin in the set value. For example, the control unit 250 may compare the value obtained by multiplying the set value by a coefficient less than 1 (for example, 0.95) with the volume or mass of the waste material R calculated by the control unit 250 to make the determination in step S19. In this case, by setting the maximum loading capacity of the dump truck 300 as the set value, management can be performed so as to surely not exceed the maximum loading capacity.

[0072] [6. Effects, etc.] As described above, the road surface cutting machine 100 to which the present invention is applied includes a belt conveyor 164, and discharges the waste material R of the road surface cut asphalt to the outside by the belt conveyor 164. The road surface cutting machine 100 disposes a sensor 220 that continuously measures the height of the waste material R with respect to the upper surface of the belt 168 above the belt 168 of the belt conveyor 164. The road surface cutting machine 100 includes a calculation unit 262 that calculates the amount of the waste material R based on the cross-sectional area A of the waste material R calculated based on the height of the waste material R and the moving amount of the belt 168. According to this configuration, the amount of the waste material R discharged by the belt conveyor 164 can be measured with a simple configuration in which the sensor unit 210 is installed on the belt conveyor 164. Thereby, management of the amount of the waste material R can be realized with a simple structure. For example, management can be easily performed so that the amount of the waste material R transferred from the belt conveyor 164 to the loading platform 310 does not exceed the maximum loading capacity of the dump truck 300.

[0073] The road surface cutting machine 100 includes a display unit 282 that displays the amount of the waste material R. According to this configuration, since the amount of the waste material R discharged by the belt conveyor 164 is displayed, the operator can easily know the amount of the discharged waste material R. Thereby, management of the amount of the waste material R can be realized more easily. For example, the operator of the road surface cutting machine 100 may stop the belt conveyor 164 at the timing when the amount of the waste material R displayed on the display unit does not exceed the maximum loading capacity of the dump truck 300.

[0074] The road surface cutting machine 100 is provided with a plurality of sensors 220 at predetermined intervals in the width direction of the belt 168. According to this configuration, since the height H3 of the waste material R can be detected at a plurality of positions in the width direction of the belt 168, the cross-sectional area A of the waste material R conveyed by the belt 168 can be obtained with higher accuracy. As a result, the amount of the waste material R discharged by the belt conveyor 164 can be measured with high accuracy, and more accurate management of the amount of the waste material R can be realized.

[0075] Also, according to the waste material amount measuring device 200 mounted on the road surface cutting machine 100, the effects of the road surface cutting machine 100 described above can be obtained.

[0076] [7. Other Embodiments] The above-described embodiment shows a specific example to which the present invention is applied, and does not limit the form to which the invention is applied.

[0077] In the above-described embodiment, a configuration in which the drive source of the self-propelled vehicle 120 is a diesel engine is illustrated, but this is an example. The self-propelled vehicle 120 may be an electric vehicle equipped with a motor as a drive source.

[0078] In the above-described embodiment, as the power for operating the central conveyor 162 and the belt conveyor 164, the drive source of the self-propelled vehicle 120 may be used, or a hydraulic motor or an electric motor may be used. Similarly, the cutting drum 140 may be configured to be mechanically rotationally driven by being connected to the drive source of the self-propelled vehicle 120, or may be rotationally driven by a hydraulic motor or an electric motor. Further, the self-propelled vehicle 120 may be configured to travel by crawlers instead of the front wheels 122 and the rear wheels 124.

[0079] The configuration of fixing the sensor 220 to the conveyor tip 166 described in the above embodiment is an example. For example, the tip of the sensor 220 may be configured to face obliquely with respect to the plane of the belt 168. Also, the sensor unit 210 may arrange a plurality of sensors 220 side by side in the width direction of the belt 168. For example, the sensors 220 may be arranged side by side obliquely with respect to the conveyance direction of the belt 168. Also, each of the plurality of sensors 220 may be fixed independently with respect to the guard 172.

[0080] The sensor 220 is not limited to an ultrasonic distance sensor that detects distance using ultrasonic waves. For example, it may be a laser distance sensor that irradiates laser light. Also, the sensor 220 may include a digital camera and detect distance based on the captured image of the camera. Also, the sensor 220 may be connected to the control unit 250 by wireless communication or may be connected by wire. Other configurations can also be arbitrarily changed.

Explanation of Signs

[0081] 100 Road surface cutting machine 120 Self-propelled vehicle 122 Front wheel 124 Rear wheel 126 Driver's cab 128 Movement measurement unit 140 Cutting drum 150 Electromagnetic wave radar 160 Conveyor unit 162 Central conveyor 164 Belt conveyor 166 Conveyor tip 168 Belt 172 Guard 174 Pulley 200 Scrap amount measurement device 210 Sensor unit 220 Sensor 225 Sensor base 250 Control unit 260 Control section 261 Detection control section 262 Calculation unit 263 Output control unit 270 Memory unit 271 Reference distance data 272 Data for calculating cross-sectional area 273 Mass conversion coefficient 274 Cross-sectional area data 275 Volume value data 276 Mass value data 281 Operation unit 283 I / F 295 Level display unit 296 Cross-sectional area display unit 297 Integrated quantity display unit 298 Notification display unit 300 Dump truck 310 Loading platform 400 Asphalt mixture layer A Cross-sectional area H3 Height R Waste material

Claims

1. A road milling machine is provided with a belt conveyor and discharges waste asphalt from the road surface by the belt conveyor, A sensor is disposed above the belt of the belt conveyor to continuously measure the height of the waste material based on the upper surface of the belt; A calculation unit is provided for calculating the amount of the waste material based on the area of ​​the waste material calculated based on the height of the waste material and the amount of movement of the belt. Road milling machine.

2. A display unit that displays the amount of the waste material is provided.

2. A road milling machine according to claim 1.

3. The sensor is provided in a plurality of locations at predetermined intervals in the width direction of the belt.

3. A road milling machine according to claim 2.

4. A device for measuring the amount of waste material discharged on a belt conveyor, A sensor is disposed above the belt of the belt conveyor to continuously measure the height of the waste material based on the upper surface of the belt; A calculation unit is provided for calculating the amount of the waste material based on the area of ​​the waste material calculated based on the height of the waste material and the amount of movement of the belt. Waste material quantity measuring device.

5. A display unit that displays the amount of the waste material is provided.

5. The waste material amount measuring device according to claim 4.

6. The sensor is provided in a plurality of locations at predetermined intervals in the width direction of the belt. The waste material amount measuring device according to claim 5.

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