Road 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 milling machine and a waste material amount measuring device. [Background technology]

[0002] Conventionally, road milling machines that cut asphalt pavement when repairing asphalt pavement have been known (see, for example, Patent Document 1). The road milling machine is equipped with a belt conveyor, and the cut asphalt waste material is discharged on the belt conveyor. The waste material discharged by the road milling machine is transferred to the bed of a dump truck for transport and is transported to a treatment plant. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-158070 Summary of the Invention [Problem to be solved by the invention]

[0004] The amount of waste material transferred from the road milling machine to the dump truck bed must be within the dump truck's maximum load capacity. One method for managing the amount of waste material is to attach sensors to the road milling machine that measure the depth, width, and extension of the cutting area, and calculate the cutting volume from the values ​​detected by these sensors. However, this method requires attaching multiple sensors to the road milling machine, which requires a complex mounting structure, making it difficult to calculate the cutting volume. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a road milling machine and a waste material amount measuring device that can solve the above problems and manage the amount of waste material discharged by the road milling machine with a simple structure. [Means for solving the problem]

[0005] In one aspect of the present invention, a road milling machine is provided with a belt conveyor, and the road milling machine discharges waste asphalt material from the road milled by the belt conveyor to the outside. a pair of guards are arranged, a pulley is arranged between the pair of guards, a belt is passed around the pulley and the belt is supported at a folding position of the belt, left and right support legs extending above the pair of guards are fixed to the pair of guards, and a sensor bracket is supported in a suspended state via a support plate arranged across the left and right support legs, Above the belt directly above the shaft supporting the pulley Then, for the sensor bracket, This road surface milling machine is equipped with a sensor that continuously measures the height of the waste material based on the top surface of the belt, and a calculation unit that calculates 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. [Effects of the Invention]

[0006] According to the present invention, by detecting the height of the waste material being transported on the belt of the belt conveyor, it is possible to realize the management of the amount of waste material with a simple structure. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. [Figure 2] FIG. 2 is a front view of the sensor unit. [Figure 3] FIG. 2 is a side view of the sensor unit. [Figure 4] FIG. 2 is a block diagram of a waste material amount measuring device. [Figure 5] FIG. 2 is a front view of the control unit. [Figure 6] 4 is a flowchart showing the operation of the waste material amount measuring device. DETAILED DESCRIPTION OF THE INVENTION

[0008] [1. Configuration of road milling machine] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a side view of a road cutter 100 to which this embodiment is applied. Fig. 1 illustrates a dump truck 300 used together with the road cutter 100.

[0009] The road milling machine 100 is a device that cuts and removes an asphalt mixture layer 400 laid on a roadbed or a concrete deck. The road milling machine 100 includes a self-propelled vehicle 120, a cutting drum 140 disposed on the bottom of the self-propelled vehicle 120, and a conveyor unit 160 that transports waste material R of the asphalt mixture layer 400.

[0010] The road milling machine 100 cuts the asphalt mixture layer 400 while traveling in the direction indicated by arrow F in the figure using power from a power source mounted on the self-propelled vehicle 120. The traveling direction indicated by arrow F is the front of the road milling machine 100. The road milling machine 100 discharges waste material R generated by cutting the asphalt mixture layer 400 using a conveyor unit 160 that extends 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 left and right front wheels 122, including, for example, rubber tires and wheels, are attached to the front lower 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 rear lower part of the self-propelled vehicle 120. Furthermore, a diesel engine (not shown) is mounted as a power source at a predetermined position at the rear of the self-propelled vehicle 120, and an engine hood (not shown) is attached to cover the top and both sides of the engine hood in an openable and closable manner. Furthermore, a driver's cab 126 for the operator of the road milling 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 front wheels 122 and rear wheels 124 of the self-propelled vehicle 120. Here, the front wheels 122 and rear wheels 124 may be driven hydraulically.

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

[0014] The self-propelled vehicle 120 is equipped with a first hydraulic cylinder and a second hydraulic cylinder (not shown) that support the cutting drum 140. The first hydraulic cylinder is arranged so as to be able to extend and retract in the left-right direction of the self-propelled vehicle 120, and the second hydraulic cylinder is arranged so as to be able to extend and retract in the up-down direction of the self-propelled vehicle 120. The cutting drum 140 is arranged so as to be able to move in the left-right direction and the up-down direction relative to the self-propelled vehicle 120 by the first hydraulic cylinder and the second hydraulic cylinder.

[0015] Therefore, by appropriately controlling the supply and discharge of hydraulic oil to the first cylinder, the cutting drum 140 can be moved left and right relative to the mobile vehicle 120, making it possible to cut the asphalt mixture layer 400 to the full width of the road, for example. Furthermore, by appropriately controlling the supply and discharge of hydraulic oil to the second cylinder, the cutting drum 140 can be moved up and down relative to the mobile vehicle 120, making it possible to freely change the cutting depth of the asphalt mixture layer 400. The second hydraulic cylinder is an example of an actuator that moves the cutting drum up and down relative to the mobile vehicle.

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

[0017] The central conveyor 162 is, for example, a belt conveyor that is surrounded by a cover, and receives the waste material R of the asphalt mixture layer 400 that has been cut by the cutting drum 140 and transports it to the front and above of the mobile vehicle 120.

[0018] The belt conveyor 164 is, for example, surrounded by a cover and includes a mechanism for circulating an endless belt 168. The belt conveyor 164 places the waste material R transported by the central conveyor 162 on the belt 168 and transports it further forward and upward, where it is loaded onto the loading platform 310 of a dump truck 300 traveling in front of the road milling machine 100.

[0019] A pair of left and right electromagnetic wave radars 150 are disposed on the bottom of the motor-propelled vehicle 120 to measure the thickness of the asphalt mixture layer 400 before it is cut by the cutting drum 140. As shown in Figure 1, the pair of left and right electromagnetic wave radars 150 are disposed in front of the cutting drum 140 and at positions facing the left and right ends of the cutting drum 140, with the direction of travel of the motor-propelled vehicle 120 as the reference. Therefore, the electromagnetic wave radars 150 can measure the thickness of the asphalt mixture layer 400 at the left and right ends 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 (dielectric constant, conductivity) between the asphalt mixture layer 400 and the roadbed or concrete slab located below the asphalt mixture layer 400. In particular, the electromagnetic wave radar 150 has a transmitting antenna and a receiving antenna, and irradiates microwave-band electromagnetic waves into the interior of the asphalt mixture layer 400 via the transmitting antenna. The electromagnetic wave radar 150 receives the electromagnetic waves reflected at the interface between the asphalt mixture layer 400 and the roadbed or concrete slab located below the asphalt mixture layer 400 via the receiving antenna. The electromagnetic wave radar 150 measures the thickness of the asphalt mixture layer 400 based on the time (reflection time) between irradiating the electromagnetic waves and receiving them. 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 connected to the electromagnetic wave radar 150.

[0021] A movement amount measuring unit (not shown) is disposed in the road milling machine 100. The movement amount measuring unit is equipped with, for example, an encoder that detects the amount of rotation of the front wheels 122 or rear wheels 124, or a GNSS (Global Navigation Satellite System), and measures the distance traveled by the mobile vehicle 120. Although not shown, the road milling machine 100 is equipped with a display device that visually notifies the operator of the road milling machine 100 of the thickness of the asphalt mixture layer 400. A liquid crystal monitor or the like can be used as this display device.

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

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

[0024] [2. Sensor unit configuration] Fig. 2 is a front view of sensor unit 210. Fig. 3 is a side view of sensor unit 210. Figs. 2 and 3 also illustrate the configuration of conveyor tip end 166 to show the installation state of sensor unit 210 at conveyor tip end 166.

[0025] 2 and 3 show the X-axis, Y-axis, and Z-axis. The X-axis, Y-axis, and Z-axis are perpendicular to one another, with the Z-axis corresponding to the up-and-down direction of conveyor tip 166, the Y-axis corresponding to the width direction of conveyor tip 166, i.e., belt 168, and the X-axis corresponding to the front-to-back direction of conveyor tip 166. The positive direction of the Z-axis is upward, the positive direction of the X-axis is backward, and the positive direction of the Y-axis is leftward.

[0026] A pair of guards 172 are arranged on the left and right sides of the conveyor tip 166, and a pulley 174 is arranged between these pair of guards 172. A belt 168 is stretched over the pulley 174, which supports the belt 168 at its turnback position. A shaft 176 supporting the pulley 174 protrudes from each of the left and right ends of the pulley 174.

[0027] A bearing unit 178 is fixed to the guard 172 by a fixing bar 180. The tip of the 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 to rotate the shaft 176.

[0028] 3, the shaft 176 passes through an elongated hole 182 drilled in the guard 172 and fits into the bearing unit 178. The bearing unit 178 is connected to the guard 172 via fixing bars 180 disposed above and below the bearing unit 178. The shaft 176 is movable in the front-to-rear direction along the elongated hole 182, and by loosening the connection between the fixing bars 180 and the bearing unit 178, the shaft 176 can be moved in the front-to-rear direction together with the bearing unit 178. By moving the shaft 176, it is possible to adjust the tension of the belt 168, for example.

[0029] The 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 so that the tip of the sensor 220 faces the belt 168. This allows the multiple sensors 220 to be arranged side by side in the width direction of the belt 168. The tip of each sensor 220 faces the belt 168 perpendicular to the plane of the belt 168.

[0031] The sensor unit 210 may be positioned arbitrarily in the front-to-rear direction of the belt 168. For example, as shown in Fig. 3, the axial center of the shaft 176 and the center of the sensor 220 may be positioned at the same position in the X direction.

[0032] Sensor 220 is a distance sensor that detects the distance between sensor 220 and an object facing its tip. For example, an ultrasonic sensor can be used as sensor 220. Sensor 220 has an ultrasonic element that emits ultrasonic waves and receives reflected waves from the object, and detects the distance from the tip of sensor 220 to the object based on the time from emission 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 an ultrasonic wave until when it receives it, calculates the distance based on the measured time, and so on.

[0034] In this embodiment, the tip of the sensor 220 faces perpendicularly to the plane of the belt 168. As shown in Fig. 2, when the sensor 220 performs detection when there is no waste material R on the belt 168, a distance H1 from the tip of the sensor 220 to the upper surface of the belt 168 is detected. When the sensor 220 performs detection while the waste material R is being transported, a distance H2 from the tip of the sensor 220 to the upper end of the waste material R is detected. The height H3 of the waste material R on the belt 168 directly below the sensor 220 is calculated from the difference between the distance H1 and the distance H2.

[0035] The sensor unit 210 detects the distances H1 and H2 using a plurality of sensors 220 arranged in a row 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 ​​a cross section obtained by cutting the waste material R on the belt 168 at the position of the sensor 220 in the front-to-rear direction indicated by the X-axis. The volume of the waste material R transported by the belt 168 can be calculated by multiplying the cross-sectional area A by the amount of movement of the belt 168.

[0036] [3. Control unit configuration] Fig. 4 is a block diagram of the waste material amount measuring device 200. The configuration of a control unit 250 provided in the waste material amount measuring device 200 will be described with reference to Fig. 4.

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

[0038] The processor of the control unit 260 may be a single processor or multiple processors, or may be programmed hardware. The processor may be configured as an ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array). The control unit 260 may also be an integrated IC including a processor and memory.

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

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

[0041] The I / F 283 connects the sensors 220 and the movement amount measurement section 128 to the control section 260. To the I / F 283, each of the sensors 220 provided in the sensor unit 210 is connected.

[0042] Movement distance measuring unit 128 is a device that measures the length traveled by belt 168, i.e., the amount of movement, and is installed on belt conveyor 164. Movement distance measuring unit 128 periodically outputs the amount of movement of belt 168 at a preset cycle. I / F 283 outputs data indicating the amount of movement output by movement distance measuring unit 128 to 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 used by 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 of the sensors 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 position of each sensor 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 mass conversion coefficients 273 for each composition or type of asphalt pavement. In this case, the control unit 260 selects and uses the mass conversion coefficient 273 that corresponds to the asphalt mixture layer 400 that the road surface milling machine 100 cuts.

[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 cycle and acquires a detected value. The detection control unit 261 also acquires the amount of movement 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 a 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 a 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 memory unit 270 as cross-sectional area data 274. If the memory unit 270 has already stored 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 transported 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 memory unit 270 based on the calculated value of the volume of the waste material R. The volume value data 275 indicates a cumulative value obtained by accumulating the volumes of the waste material R calculated by the calculation unit 262. In other words, the volume value data 275 indicates an 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 volume value of the waste material R may be multiplied by the mass conversion coefficient 273 to calculate the mass of the waste material R transferred to the loading platform 310.

[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 in the driver's cab 126. This allows the operator of the road milling machine 100 to 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 unit 295, a cross-sectional area display unit 296, an integrated amount display unit 297, and a notification display unit 298 are arranged.

[0053] The power switch 291 is an operator that instructs the power supply to the waste material amount measuring device 200 to be turned on and off. The power switch 291 may also function as an operator that instructs the control unit 260 to start measuring the amount of waste material R. Specifically, the control unit 260 may start measuring the amount of waste material R in response to the operation of the power switch 291. The two functions of the power switch 291 can be switched depending on, for example, the time that the operator presses the power switch 291.

[0054] The reset switch 292 is an operator that instructs the initialization of the integrated amount of volume values ​​of the waste material R, i.e., the volume value data 275. The reset switch 292 may also function as an operator that instructs the control unit 260 to measure the distance H1. Specifically, in response to the operation of the reset switch 292, the control unit 260 may execute detection by the sensor 220 and store the detected distance in the memory unit 270 as the reference distance data 271. The two functions of the reset switch 292 can be switched, for example, depending on the time the operator presses the reset switch 292. The power switch 291 and the reset switch 292 are examples that constitute the operation unit 281.

[0055] Level display unit 295, cross-sectional area display unit 296, and integrated amount display unit 297 display numerical values ​​using a liquid crystal display panel or a 7-segment LED. Level display unit 295, cross-sectional area display unit 296, and integrated amount display unit 297 are examples of components of display unit 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 multiple heights H3 calculated based on the detection values ​​of the multiple sensors 220 into a single index value, conversion value, or guideline value, and causes the level display unit 295 to display the single index value, conversion value, or guideline value, or causes the level display unit 295 to display the average value of the multiple 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 or the like corresponding to the value of the cross-sectional area data 274. The output control unit 263 causes the cross-sectional area display unit 296 to update the display every time the calculation unit 262 updates the cross-sectional area data 274.

[0058] The output control unit 263 causes the integrated amount 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 causes the integrated amount display unit 297 to update the display 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 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 lights up or blinks the notification display unit 298 when the value of the volume value data 275 or the mass value data 276 has reached a preset value. This set value is, for example, set in advance and stored in the memory unit 270.

[0060] 5 is one example. The control unit 250 may be configured to be capable of displaying, on a single liquid crystal display panel, the level display section 295, the cross-sectional area display section 296, the integrated amount display section 297, and the notification display section 298. The control unit 250 may also be provided with a buzzer or speaker that outputs a sound together with the lighting or flashing of the notification display section 298.

[0061] [4. Operation of waste material amount measuring device] FIG. 6 is a flowchart showing the operation of the waste material amount measuring device 200. 6 are executed by the detection control unit 261, steps S16 to S18 are executed by the calculation unit 262, and steps S19 to S20 are executed by the output control unit 263. In FIG.

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

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

[0064] The control unit 250 calculates the cross-sectional area A (step S16). In step S16, the control unit 250 calculates a height H3 at the detection position of each sensor 220 based on the detection values ​​of the multiple 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 memory unit 270 with the calculated cross-sectional area A.

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

[0066] The control unit 250 adds the value of the volume of the waste material R calculated in step S18 to the volume value data 275 stored in the storage unit 270, thereby updating the volume value data 275 (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). If the control unit 250 determines that the value of the volume value data 275 has reached the set value (step S19: YES), it executes a notification (step S20). The notification may be, for example, an operation of lighting or flashing the notification display unit 298, or may be an output of a sound. Thereafter, the control unit 250 proceeds to step S21. Moreover, 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. As a result, 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 is given (step S21: YES), the control unit 250 ends this process. The instruction to end the measurement is given by operating the power switch 291, for example.

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

[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 a set value. In other words, the set value may be a set value related to 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 set value including a margin. For example, the control unit 250 may make the determination in step S19 by comparing a 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. In this case, by setting the maximum load capacity of the dump truck 300 as a set value, it is possible to perform management so as to reliably prevent the maximum load capacity from being exceeded.

[0072] [6. Effects, etc.] As described above, the road milling machine 100 to which the present invention is applied is equipped with the belt conveyor 164, and discharges waste asphalt R that has been milled from the road surface to the outside via the belt conveyor 164. The road milling machine 100 has a sensor 220 disposed above the belt 168 of the belt conveyor 164 that continuously measures the height of the waste material R with the upper surface of the belt 168 as the reference. The road milling machine 100 is equipped with a calculation unit 262 that calculates the amount of 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 amount of movement of the belt 168. According to this configuration, the amount of 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. This makes it possible to manage the amount of waste material R with a simple structure. For example, it is possible to easily manage the amount of waste material R transferred from the belt conveyor 164 to the loading platform 310 so as not to exceed the maximum load capacity of the dump truck 300.

[0073] The road milling machine 100 is provided with a display unit 282 that displays the amount of waste material R. According to this configuration, the amount of waste material R discharged by the belt conveyor 164 is displayed, so the operator can easily know the amount of discharged waste material R. This makes it easier to manage the amount of waste material R. For example, the operator of the road surface milling machine 100 can simply stop the belt conveyor 164 at a timing when the amount of waste material R displayed on the display unit does not exceed the maximum load capacity of the dump truck 300.

[0074] The road milling 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, the height H3 of the waste material R can be detected at multiple positions in the width direction of the belt 168, so that the cross-sectional area A of the waste material R transported by the belt 168 can be determined with higher accuracy. As a result, the amount of waste material R discharged by the belt conveyor 164 can be measured with high accuracy, and more accurate management of the amount of waste material R can be achieved.

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

[0076] 7. Other Embodiments The above 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 embodiment, the self-propelled vehicle 120 is configured to have a diesel engine as its driving source, but this is merely an example. The self-propelled vehicle 120 may be an electric vehicle equipped with a motor as its driving source.

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

[0079] The configuration in which the sensor 220 is fixed to the conveyor tip 166 described in the above embodiment is one example. For example, the tip of the sensor 220 may be configured to face obliquely relative to the plane of the belt 168. Furthermore, the sensor unit 210 may be configured such that multiple sensors 220 are arranged in the width direction of the belt 168. For example, the sensors 220 may be arranged in a line obliquely relative to the conveying direction of the belt 168. Furthermore, each of the multiple sensors 220 may be independently fixed to the guard 172.

[0080] The sensor 220 is not limited to an ultrasonic distance sensor that detects distance using ultrasonic waves, but may be, for example, a laser distance sensor that emits laser light. The sensor 220 may also be equipped with a digital camera and detect distance based on an image captured by the camera. Furthermore, the sensor 220 may be connected to the control unit 250 by wireless communication or by wire. Other configurations may also be changed as desired. [Explanation of symbols]

[0081] 100 Road milling machine 120 Self-propelled vehicles 122 front wheel 124 rear wheel 126 Driver's cab 128 Travel amount measuring section 140 Cutting drum 150 Electromagnetic Wave Radar 160 conveyor units 162 Central Conveyor 164 Conveyor Belt 166 Conveyor tip 168 Belt 172 Guard 174 Pulley 200 Waste material amount measuring device 210 Sensor Unit 220 Sensors 225 Sensor base 250 control unit 260 Control Unit 261 Detection control section 262 Calculation Unit 263 Output control section 270 Storage section 271 Reference Distance Data 272 Data for calculating cross-sectional area 273 Mass Conversion Factor 274 Cross-Section Data 275 Volume Data 276 Mass Data 281 Operation section 283 Interface 295 Level display 296 Cross-sectional area display section 297 Accumulated amount display unit 298 Notification display unit 300 Dump Truck 310 Cargo bed 400 Asphalt mixture layer A cross-sectional area H3 height R Waste material

Claims

1. A road milling machine equipped with a belt conveyor, which discharges waste asphalt from the road surface by the belt conveyor, A pair of guards are arranged at the tip of the belt conveyor, a pulley is arranged between the pair of guards, a belt is stretched around the pulleys and supported at the belt's turn-back position, left and right support legs extending above the guards are fixed to the pair of guards, a sensor bracket is supported in a suspended state via a support plate arranged across the left and right support legs, and a sensor is arranged above the belt directly above the axis supporting the pulley, which continuously measures the height of the waste material relative to the sensor bracket, with the top surface of the belt as a reference. a calculation unit that calculates 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 movement amount of the belt; Road milling machine.

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

2. The road milling machine according to claim 1.

3. A plurality of the sensors are provided at predetermined intervals in the width direction of the belt.

3. The road milling machine according to claim 2.

4. A device for measuring the amount of waste material discharged on a belt conveyor. A pair of guards are arranged at the tip of the belt conveyor, a pulley is arranged between the pair of guards, a belt is stretched around the pulleys and supported at the belt's turn-back position, left and right support legs extending above the guards are fixed to the pair of guards, a sensor bracket is supported in a suspended state via a support plate arranged across the left and right support legs, and a sensor is arranged above the belt directly above the axis supporting the pulley, which continuously measures the height of the waste material relative to the sensor bracket, with the top surface of the belt as a reference. a calculation unit that calculates 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 movement amount of the belt; Waste material amount measuring device.

5. A display unit is provided to display the amount of the waste material. The waste material amount measuring device according to claim 4.

6. A plurality of the sensors are provided at predetermined intervals in the width direction of the belt. The waste material amount measuring device according to claim 5.

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