JP2006016197A - Refuse-collecting vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refuse-collecting vehicle capable of operating a loading device and a discharge device at an adequate speed at low noise level on the whole. <P>SOLUTION: The number of rotation of an AC motor 67 to drive a hydraulic pump 22 is controlled by a control device 69, and the number of rotation is set to be "medium" when driving a loading device 70, "low" when driving a throw-in box driving device 71, and "high" when driving a discharging plate driving device 72, respectively. The discharge amount of the hydraulic pump 22 is changed according to the device to be driven, and each device is operated at an adequate speed. Since any wasteful hydraulic energy need not be generated, the noise level becomes low on the whole. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a garbage collection vehicle having a function of efficiently loading garbage such as garbage and oversized garbage and discharging the garbage together.

  The refuse collection vehicle includes a loading device for efficiently loading the dust thrown into the dust throwing box into the dust containing box, and a discharge device for collectively discharging the dust loaded in the dust containing box. In addition, the discharge device includes, for example, an input box drive device that opens the dust storage box by rotating the dust input box upward, and a discharge plate drive device that pushes out the dust loaded in the dust storage box by moving the discharge plate. (For example, refer patent document 1). The cylinders of the loading device, the input box driving device, and the discharge plate driving device are supplied with hydraulic pressure from a common hydraulic pump.

Japanese Utility Model Publication No. 63-23364 (pages 2 to 3 and FIG. 2)

In the conventional garbage truck as described above, the optimum flow rate of oil for operating each cylinder of the loading device, the input box drive device and the discharge plate drive device at a desired speed is different. The order is box drive device <loading device <discharge plate drive device. Here, if the discharge amount of the hydraulic pump is set in accordance with the discharge plate driving device with the largest flow rate, the loading circuit and the input box driving device constitute a hydraulic circuit that releases excess pressure oil by a relief valve or the like. There is a need. However, noise due to fluid friction and the like when releasing the pressure oil and noise of the hydraulic pump are generated, and the loading device is used most frequently, so noise is frequently generated. For this reason, in reality, it is difficult to employ such a hydraulic circuit. On the other hand, when the discharge amount of the hydraulic pump is set in accordance with the loading device that is used most frequently, the operation of the discharge plate driving device becomes slow.
In view of the conventional problems as described above, an object of the present invention is to provide a garbage truck that can operate a loading device and a discharge device at an appropriate speed with low noise overall.

The refuse collection vehicle of the present invention includes a dust storage box, a dust input box connected to the dust storage box, an electric motor, a hydraulic pump driven by the electric motor, and a hydraulic pressure of the hydraulic pump. Based on the loading device that performs the operation of loading the dust thrown into the dust throwing box into the dust containing box, and for discharging the dust contained in the dust containing box based on the hydraulic pressure of the hydraulic pump A discharge device that performs an operation; an operation unit that provides an operation start signal to each of the loading device and the discharge device; and a control device that rotates the electric motor at a rotation speed corresponding to the operation started by the operation start signal. It is provided.
In the garbage truck configured as described above, the discharge amount of the hydraulic pump is changed according to the driving device by rotating the electric motor at the rotation speed corresponding to the operation to be started by the control device. Each device can be operated at an appropriate speed. Moreover, since it is not necessary to generate useless hydraulic energy, the overall noise is reduced.

Further, in the above garbage collection vehicle, the discharge device includes a throwing box drive device that opens and closes the dust throwing box with respect to the dust storage box, and the control device sets the rotation speed of the electric motor from the time of operation of the loading device. Alternatively, it may be made smaller during operation of the input box drive device.
In this case, the dust input box can be slowly opened with respect to the dust container. Therefore, it is possible to prevent further contact between the dust input box that opens and the worker, thereby further ensuring safety.

Further, in the above garbage collection vehicle, the discharge device includes a discharge plate driving device that pushes out the stored dust by moving the discharge plate, and the control device discharges the rotation speed of the electric motor more than during the operation of the loading device. You may make it enlarge at the time of operation | movement of a plate drive device.
In this case, a quick discharge operation and a return operation after completion of discharge can be realized, and the work efficiency is improved.

Further, in the refuse collection vehicle, the discharge device includes a storage box drive device that discharges the stored dust by a dumping operation of the dust storage box, and the control device determines the rotation speed of the electric motor from the time of operation of the loading device. Alternatively, it may be made smaller during operation of the storage box drive device.
In this case, the inertia force of the refuse storage box at the maximum dump angle can be suppressed by a relatively low speed dump operation. Therefore, for example, a safe dump operation and return operation can be performed without performing complicated two-stage dump control.

  According to the refuse collection vehicle of the present invention, the discharge amount of the hydraulic pump is changed according to the driving device by rotating the electric motor at the rotation speed corresponding to the operation to be started by the control device. Can be operated at an appropriate speed. Moreover, since it is not necessary to generate useless hydraulic energy, the overall noise is reduced. Thus, it is possible to provide a garbage truck that can operate the loading device and the discharging device at an appropriate speed with low noise overall.

FIG. 1 is a side sectional view showing a garbage truck according to a first embodiment of the present invention. This garbage truck is a press type that has a compression stroke in the loading operation, and the discharge is an extrusion type configuration.
In the figure, the garbage collection vehicle 1 includes a dust storage box 2 and a dust input box (also referred to as a tailgate) 3 connected to the rear part thereof. At the rear of the dust input box 3, an input port 3a for inputting dust is formed, and a lid 3b that slides up and down to open and close the input port 3a is provided. An opening 3 d for loading the dust into the dust storage box 2 is formed in the lower front part of the dust throwing box 3. The dust input box 3 can be rotated around a fulcrum P provided at the upper portion thereof, and can be opened and closed with respect to the dust container box 2. The dust container 3 closes the dust container 2 at the position indicated by the solid line in the figure, and opens the dust container box 2 to discharge the dust when rotated upward as indicated by the two-dot chain line in the figure. Ready for

  Next, the loading device 70 provided in the dust box 3 will be described. First, left and right side walls 3c of the dust box 3 are provided with guide rails 4 extending obliquely up and down, and a pair of left and right rollers 6 attached to the slider 5 are obliquely up and down inside the guide rails 4. Can move. The slider 5 is formed by connecting the left and right members having a side shape as shown in the drawing by a plate or the like (not shown) extending in the vehicle width direction. Further, a pushing plate 8 is rotatably attached to the lower end portion of the slider 5 via a pin 7. The pushing plate 8 is also integrally formed by connecting the left and right side members shown in the figure with a plate or the like (not shown) extending in the vehicle width direction.

  On the other hand, the cylinder side end of the push cylinder 9 is attached to the side wall 3 c by a pin 10, and the piston side end is connected to the upper end of the slider 5 by a pin 11. On the other hand, the cylinder side end of the press cylinder 12 is connected to the pushing plate 8 by a pin 13, and the piston side end is connected to the upper end of the slider 5 by the pin 11. Along with the pushing plate 8, the slider 5 rises obliquely by the extension operation of the push cylinder 9, and descends obliquely by the contraction operation. As a result, the slider 5 can reciprocate corresponding to primary compression and push-in described later. Further, the pushing plate 8 is rotated clockwise around the pin 7 by the extension operation of the press cylinder 12, and is rotated counterclockwise by the contraction operation. Thereby, the pushing plate 8 can be reciprocally rotated corresponding to reversal and secondary compression described later.

  2A is an operation explanatory view in which only the pushing plate 8, the push cylinder 9 and the press cylinder 12 are extracted from FIG. 1 (however, the position of the push cylinder 9 is slightly shifted in order to make the drawing easy to see). ). The pushing plate 8 performs the “reverse” stroke by the contraction operation of the press cylinder 12 with the position shown in (a) as the original position, and enters the state shown in (b). Next, the push plate 8 performs a “primary compression” process by the contraction operation of the push cylinder 9 and is in a state shown in FIG. Subsequently, the pushing plate 8 performs a “secondary compression” process by the extension operation of the press cylinder 12 and is in a state shown in FIG. Finally, the pushing plate 8 performs a “pushing” stroke by the push cylinder 9 extending, and returns to the state shown in FIG. As the push cylinder 9 and the press cylinder 12 operate alternately in this way, the pushing plate 8 performs a stroke operation (reversing, primary compression, secondary compression, pushing). As shown in the drawing, the distal end portion 8a of the pushing plate 8 draws a closed shape in which the operation locus connects four points.

  In the vicinity of the push cylinder 9 and the press cylinder 12, proximity switches (14, 15, 16, and 17) are provided for detecting that their expansion and contraction operations have reached the extension end and the contraction end, respectively. The first proximity switch 14 detects that the operation of the push cylinder 9 has reached the extended end. The second proximity switch 15 detects that the operation has reached the contracted end by detecting the dog 12 a attached to the press cylinder 12. The third proximity switch 16 detects that the operation of the push cylinder 9 has reached the contracted end. The fourth proximity switch 17 detects that the operation of the press cylinder 12 has reached the extended end. The first proximity switch 14 and the third proximity switch 16 are fixedly attached to the dust box 3, but the second proximity switch 15 and the fourth proximity switch 17 are attached to the slider 5 side. The push cylinder 9 moves with the expansion and contraction operation.

Returning to FIG. 1, a discharge plate 18 is provided inside the garbage container 2 so as to be movable in the front-rear direction of the vehicle body. One end 19 a of the telescopic discharge cylinder 19 is connected to the discharge plate 18, and the other end 19 b is connected to the dust container 2. The discharge plate 18 is movable in a range from a position indicated by a solid line to a position indicated by a two-dot chain line in the drawing by expansion and contraction of the discharge cylinder 19. When the dust is empty, the discharge plate 18 is in a position indicated by a solid line, and a space S in which dust is loaded is secured behind the discharge plate 18.
The discharge cylinder 19 constitutes a “discharge plate driving device” that pushes out the dust stored in the dust storage box 2 by the rearward movement of the discharge plate 18 together with a hydraulic device to be described later connected thereto.

FIG. 3 is a rear view of the garbage truck 1. The pair of swing cylinders 20 disposed at the left and right ends of the dust input box 3 has an upper end attached to the dust storage box 2 (FIG. 1) and a lower end attached to the dust input box 3. When the swing cylinder 20 is extended, the dust throwing box 3 rotates upward to open the dust container 2, and closes when the shrinking action is performed.
The swing cylinder 20 together with a hydraulic device (described later) connected to the swing cylinder 20 constitutes a “throw-in box driving device” that opens and closes the dust-throw-in box 3 with respect to the dust storage box 2.

  FIG. 4 is a hydraulic circuit diagram relating to the push cylinder 9, press cylinder 12, discharge cylinder 19 and swing cylinder 20. The hydraulic circuit includes a tank 21, a hydraulic pump 22, pressure control valves 23, 28, 29, 30, 33, a push cylinder solenoid valve 24, a press cylinder solenoid valve 25, a discharge cylinder solenoid valve 26, and a swing cylinder solenoid. A valve (also used as a tailgate lock solenoid valve) 27, switching valves 31, 32, check valves 34 to 39, 43, filters 40, 41, a tailgate lock (cylinder) 42 and a pressure sensor 44 as shown in the figure. Connected and configured. The pressure sensor 44 constantly detects the operating pressure of the discharge oil passage of the hydraulic pump 22 and provides the detection output to the controller (50) described later.

  When the pushing plate 8 is stopped at the original position (FIG. 2A), both the push cylinder 9 and the press cylinder 12 are in the extended state, and the corresponding electromagnetic valves 24 and 25 are in the neutral position. When the solenoid 25s of the press cylinder solenoid valve 25 is energized, "reverse", when the solenoid 25e is energized, "secondary compression", and when the solenoid 24s of the push cylinder solenoid valve 24 is energized, "primary compression", When the solenoid 24e is excited, each operation of “push” is performed.

  When the discharge plate 18 is most advanced and stopped (solid line in FIG. 1), the discharge cylinder 19 is in the most extended state, and the discharge cylinder electromagnetic valve 26 is in the neutral position. When the solenoid 26e of the discharge cylinder solenoid valve 26 is excited, the discharge cylinder 19 extends. Further, when the solenoid 26s is excited, the discharge cylinder 19 is contracted. When the discharge cylinder solenoid valve 26 is in the neutral position with excitation off, both ports 19e and 19s of the discharge cylinder 19 are sealed. However, if the pressure control valve 29 and the switching valve 31 are moved to the open position, the discharge cylinder 19 can be contracted and the discharge plate 18 can be retracted even when the discharge cylinder electromagnetic valve 26 is in the neutral position.

  When the dust box 3 is closed (solid line in FIG. 1), the swing cylinder 20 is in the most contracted state, the swing cylinder solenoid valve 27 is in the neutral position, and the switching valve 32 is in the position shown. is there. When the solenoid 27e of the swing cylinder solenoid valve 27 is excited, the tailgate lock 42 operates in the unlocking direction, the swing cylinder 20 extends, and the dust throwing box 3 rotates upward. When the solenoid 27e is demagnetized and the switching valve 32 is excited, the hydraulic oil in the swing cylinder 20 is returned to the tank 21 through the switching valve 32 and the swing cylinder electromagnetic valve 27 by the dead weight of the dust throwing box 3. As a result, the swing cylinder 20 contracts and the dust box 3 rotates downward. When the solenoid 27s of the swing cylinder solenoid valve 27 is energized after the dust throwing box 3 reaches the downward rotation end, the tailgate lock 42 is locked, and the dust throwing box 3 is locked. Thereafter, the solenoid 27s is demagnetized, but the lock state of the tailgate lock 42 is maintained by the check valve 43.

  FIG. 5 is a control block diagram for operating the cylinders. Each solenoid 24e, 24s, 25e, 25s, 26e, 26s, 27e, 27s and the switching valve 32 are excited and demagnetized by the controller 50. The names of blocks such as solenoids are displayed by function. The controller 50 is supplied with input signals from the respective function switches (shown as SW; the same applies hereinafter) 51 to 59 and the first to fourth proximity switches 14 to 17 described above. Further, the main lamp 60 and the lock lamp 61 are turned on by the output of the controller 50.

  Of the above function switches, the main switch 51, the tailgate switch 52, the scraping switch 53, the discharge plate switch 54, the main lamp 60 and the lock lamp 61 are provided in the switch box SB1 of the driver's seat (cab) shown in FIG. It has been. In FIG. 6, the main switch 51 is a switch that can be held at any of the “loading”, “OFF”, and “discharge” positions, and is operated from the “OFF” to the “loading” position. Loading operation is possible. At the “discharge” position, the discharge cylinder 19 and the swing cylinder 20 can be operated. When the tailgate switch 52 is operated “up”, the dust box 3 is raised, and when it is operated “down”, the tailgate switch 52 is lowered. In addition, it is a type of switch that returns to the neutral position of “OFF” when the hand is released. When the discharge plate switch 54 is operated to “discharge”, the discharge cylinder 19 extends and the discharge plate 18 retracts, and when operated to “return”, the discharge plate 18 returns to the original position. In addition, it is a type of switch that returns to the neutral position of “OFF” when the hand is released.

  The scraping switch 53 is a selection switch of “automatic” or “manual”, and in the “automatic” position, when the garbage throwing box 3 is rotated to the upper end, an operation similar to loading is automatically performed. The dust remaining at the bottom of the input box 3 can be discharged. The main lamp 60 is lit when each switch operation of the switch box SB1 is possible. The lock lamp 61 is lit when the tailgate lock 42 is locked.

  On the other hand, in FIG. 3, switch boxes SB2 and SB3 are provided on the left side and the right side at the rear of the vehicle body, respectively. On the front face of the switch box SB2, a loading switch 55 for starting the loading operation, a stop switch 57 for stopping the loading operation, a lift switch 58, a reverse switch 59, and a communication buzzer 62 are provided on the side surface. A continuous single changeover switch 56 for selecting either “continuous” or “one cycle” of the loading operation is provided. The stop switch 57 is also provided on the right switch box SB3. The ascending switch 58, the reversing switch 59, and the contact buzzer 62 are switches that are used only in an emergency and will not be described in detail.

  Next, the system configuration of the garbage truck that drives the hydraulic pump 22 will be described with reference to the block diagram of FIG. When the structure described so far is simplified as the hydraulic pump 22 and its load, the load refers to a loading device 70 that performs an operation of loading the dust thrown into the dust throwing box 3 into the dust storage box 2, and a dust There are an input box driving device 71 that opens and closes (turns up and down) the input box 3 with respect to the dust storage box 2, and a discharge plate driving device 72 that pushes out the stored dust by moving the discharge plate 18. Note that the input box driving device 71 and the discharge plate driving device 72 are common in that they perform an operation for discharging the dust stored in the dust storage box 2, and both constitute a discharge device 73. I can say that.

  On the other hand, a generator 64 is connected to the engine 63 of the garbage truck. The output voltage of the generator 64 is supplied to an inverter 66 (including a gate control circuit) via a rectifier 65. An AC motor (induction motor) 67 for driving the hydraulic pump 22 is connected to the inverter 66. The AC motor 67 includes a rotation speed sensor 68, and the output is input to the controller 50 described above. Further, as described above, the controller 50 includes an operation signal from the main switch 51, the loading switch 55, the tailgate switch 52, the discharge plate switch 54, the stop switch 57, and the discharge side of the hydraulic pump 22 from the pressure sensor 44. A signal corresponding to the oil pressure of the pipe line is input. Based on these signals, the controller 50 and the inverter 66 constitute a control device 69 that controls the rotational speed of the AC motor 67 while using the output of the rotational speed sensor 68 as a feedback signal. The loading of the dust, the driving of the dust box 3 and the driving of the discharge plate 18 are performed by setting the engine 63 in an idling state, for example, and using the inverter 66 to convert the DC voltage obtained by rectifying the output voltage of the generator 64 from the controller 50. This is performed by converting the AC voltage of the instructed frequency to the AC motor 67 and operating the hydraulic pump 22 to supply the pressure oil.

  Next, the control contents performed by the controller 50 regarding the operations of the loading device 70, the input box drive device 71, and the discharge plate drive device 72 will be described with reference to the flowcharts of FIGS. 8 and 9 are obtained by dividing one flowchart into two diagrams, and are connected to each other by A and B in the drawings. First, the flow of processing when the loading device 70 operates will be described. When operating the loading device 70, the main switch 51 is operated to the “loading” position.

  In step S1 of FIG. 8, the controller 50 determines whether or not the main switch 51 is “loading”. Here, since it is “loading”, the process proceeds to step S2. In step S2, the controller 50 enables the loading switch 55 (accepts input) and disables both the tailgate switch 52 and the discharge plate switch 54 (does not accept input). In this state, the controller 50 waits for the loading switch 55 to be turned on (push) (repeat S1 to S3). When the loading switch 55 is turned on, the controller 50 causes the inverter 66 to output AC power having a predetermined frequency. Thus, the control device 69 including the inverter 66 rotates the AC motor 67 at a predetermined rotational speed N2 corresponding to “medium speed” (step S4).

  From this state, the controller 50 starts the operation of the loading device 70, and the loading device 70 performs the aforementioned loading cycle operation (step S5). Immediately after the operation is started, the stop switch 57 is not normally turned on, so the controller 50 proceeds from step S6 to S7 and waits for one cycle to end (No in step S7, repeats S5 to S7). When completed, the process proceeds to step S8 to determine whether or not the loading mode is “continuous”. This loading mode is the setting of the continuous single changeover switch 56 (FIGS. 3 and 5). In the case of “continuous”, the process returns to step S5, and thereafter, the stop switch 57 is stopped. The continuous operation of the loading device 70 is performed. When the stop operation is performed or when it is not “continuous” in step S8, the controller 50 stops the loading device 70 (step S9) and returns to step S1.

The rotational speed control of the AC motor 67 during the operation of the loading device 70 is performed according to the PQ diagram of FIG. In FIG. 10, the horizontal axis represents the operating pressure P [Pa] detected by the pressure sensor 44, and the vertical axis represents the discharge amount Q [m ³ / sec] of the hydraulic pump 22. The discharge amount Q is proportional to the rotational speed of the hydraulic pump 22, that is, the rotational speed of the AC motor 67. Although there are three patterns in the PQ diagram, the rotation speed control is performed on the loading device 70 in accordance with the medium speed setting indicated as “loading device” in the drawing.

Specifically, the operating pressure represented by the signal input from the pressure sensor 44 is P [Pa], and the rotational speed represented by the signal input from the rotational speed sensor 68 is converted into a discharge amount to obtain Q [m ³ / Sec], when P ≦ P2 (10.8 MPa), Q = Q2 (0.83 × 10 ⁻³ m ³ / sec (50 liters / min)). Therefore, the above-described rotation speed N2 is the rotation speed of the hydraulic pump 22 that can obtain the discharge amount Q2, and is the rotation speed of the AC motor 67. By controlling the medium speed setting as described above, it is possible to provide an optimal discharge amount for the operation of the loading device 70.

When the operating pressure P exceeds P2, the discharge amount (rotation speed) is decreased in inverse proportion to the increase in the operating pressure P. As a result, the output PQ while the discharge amount is decreasing becomes a constant value.
That is, the output when P = P2 is P2 · Q2, which is the following value from the numerical values shown in the figure. This is also the maximum output at the medium speed setting.
P2 · Q2 = 10.8 × 10 ⁶ × 0.83 × 10 ⁻³
= 9.0 × 10 ³ [W] = 9.0 [kW]
Therefore, Q when P2 <P is
Q = (9.0 × 10 ³ ) / P. . . (1)
The control device 69 rotates the AC motor 67 at a rotational speed corresponding to Q in the equation (1). However, when the operating pressure P reaches P3 (18 MPa), the controller 50 stops the AC motor 67.

Next, the flow of processing when the input box driving device 71 operates will be described. When the input box drive device 71 is operated, the main switch 51 is operated to the “discharge” position.
In step S1 of FIG. 8, the controller 50 determines whether or not the main switch 51 is “loading”. Here, since the answer is no, the process proceeds to step S10 of FIG. 9. In step S10, the controller 50 determines whether or not the main switch 51 is “discharge”. Since the answer here is yes, the process proceeds to step S11. In step S11, the controller 50 disables the loading switch 55 and enables both the tailgate switch 52 and the discharge plate switch 54. In this state, the controller 50 waits for the tailgate switch 52 or the discharge plate switch 54 to be turned on (repetition of S13 and S20), and the tailgate switch 52 is operated to “up” or “down” in step S13. Then, the discharge plate switch 54 is disabled to prevent simultaneous operation (step S14). Then, the controller 50 causes the inverter 66 to output AC power having a predetermined frequency, and thereby the control device 69 including the inverter 66 rotates the AC motor 67 at a predetermined rotation speed N1 corresponding to “low speed” (step). S15).

  From this state, the controller 50 starts the operation of the input box driving device 71 (step S16), and the dust input box 3 is rotated upward (or downward). When the tailgate switch 52 is turned “OFF”, the controller 50 stops the input box driving device 71 (step S18). Thereafter, the controller 50 enables the discharge plate switch 54 (step S19), and returns to step S1.

The rotational speed control of the AC motor 67 during the operation of the charging box driving device 71 is performed according to the low speed setting indicated as “charging box” in the figure in the PQ diagram of FIG.
Specifically, the operating pressure represented by the signal input from the pressure sensor 44 is P [Pa], and the rotational speed represented by the signal input from the rotational speed sensor 68 is converted into a discharge amount to obtain Q [m ³ / Sec], when P <P3 (18 MPa), Q = Q1 (0.50 × 10 ⁻³ m ³ / sec (30 liters / min)). Therefore, the above-described rotation speed N1 is the rotation speed of the hydraulic pump 22 from which the discharge amount Q1 is obtained, and is the rotation speed of the AC motor 67. By such low-speed setting control, the opening operation (upward rotation) of the dust bin 3 can be made slower than the operation of the loading device 70. If the medium speed setting is the same as that of the loading device 70, the operator cannot avoid the dust throwing box 3 that opens (rotates upward) at a relatively high speed, and may contact this. However, since the dust throwing box 3 opens slowly at a low speed setting, contact can be prevented and further safety can be ensured. When the operating pressure P reaches P3 (18 MPa), the controller 50 stops the AC motor 67 (normally such a situation does not occur).

  The dust closing box 3 is closed (turned downward) by operating the switching valve 32 (FIG. 4) to return the hydraulic oil from the swing cylinder 20 to the tank 21. Adjustment is possible by a throttle provided in the neutral position of the valve 27.

Next, the flow of processing when the discharge plate driving device 72 operates will be described. When the discharge plate driving device 72 is operated, the main switch 51 is operated to the “discharge” position.
In step S1 of FIG. 8, the controller 50 determines whether or not the main switch 51 is “loading”. Since the answer is NO here, the process proceeds to step S10 of FIG. In step S10, the controller 50 determines whether or not the main switch 51 is “discharge”. Since the answer here is yes, the process proceeds to step S11. In step S11, the controller 50 disables the loading switch 55 and enables both the tailgate switch 52 and the discharge plate switch 54. In this state, the controller 50 waits for the tailgate switch 52 or the discharge plate switch 54 to be turned on (repetition of S13 and S20), and in step S20, the discharge plate switch 54 is operated to “discharge” or “return”. Then, the tailgate switch 52 is disabled to prevent simultaneous operation (step S21). Then, the controller 50 causes the inverter 66 to output AC power having a predetermined frequency, whereby the control device 69 including the inverter 66 rotates the AC motor 67 at a predetermined rotational speed N3 corresponding to “high speed” (step). S22).

  From this state, the controller 50 starts the operation of the discharge plate driving device 72 (step S23), and the discharge plate 18 moves to discharge the dust or return from the completion of the discharge. When the discharge plate switch 54 is turned “OFF”, the controller 50 stops the operation of the discharge plate driving device 72 (step S25). Thereafter, the controller 50 enables the tailgate switch 52 (step S26) and returns to step S1.

The rotational speed control of the AC motor 67 during the operation of the discharge plate driving device 72 is performed according to the high-speed setting indicated as “discharge plate” in the PQ diagram of FIG.
Specifically, the operating pressure represented by the signal input from the pressure sensor 44 is P [Pa], and the rotational speed represented by the signal input from the rotational speed sensor 68 is converted into a discharge amount to obtain Q [m ³ / Sec], when P ≦ P1 (7.7 MPa), Q = Q3 (1.17 × 10 ⁻³ m ³ / sec (70 liters / min)). Therefore, the above-mentioned rotation speed N3 is the rotation speed of the hydraulic pump 22 from which the discharge amount Q3 is obtained, and is the rotation speed of the AC motor 67. By such high-speed setting control, the discharge plate 18 can be moved faster than the operation of the loading device 70. If the medium speed setting is the same as that of the loading device 70, the discharge operation and the return operation are slow and the discharge takes time. However, the high speed setting can realize a quick discharge operation and a return operation.

When the operating pressure P exceeds P1, the discharge amount (rotation speed) is decreased in inverse proportion to the increase in the operating pressure P. As a result, the output PQ while the discharge amount is decreasing becomes a constant value.
That is, the output when P = P1 is P1 · Q3, which is the following value from the numerical values shown in the figure. This is also the maximum output at the high speed setting.
P1 · Q3 = 7.7 × 10 ⁶ × 1.17 × 10 ⁻³
= 9.0 × 10 ³ [W] = 9.0 [kW]
Therefore, Q when P1 <P is
Q = (9.0 × 10 ³ ) / P. . . (2)
The control device 69 rotates the AC motor 67 at a rotational speed corresponding to Q in the equation (2). Equation (2) is the same as Equation (1).
Further, when the operating pressure P reaches P3 (18 MPa), the controller 50 stops the AC motor 67.

  When the main switch 51 is in the “OFF” state, the determination is no in step S1 of FIG. 8, and the determination is also no in step S10 of FIG. 9, and the controller 50 proceeds to step S12. Here, the controller 50 disables all of the loading switch 55, the tailgate switch 52, and the discharge plate switch 54, and then waits for the main switch 51 to be operated to “load” or “discharge”. .

  As described above, each device can be operated at an appropriate speed by changing the rotational speed of the AC motor 67, that is, the discharge amount of the hydraulic pump 22 in accordance with the device to be driven. Moreover, since it is not necessary to generate useless hydraulic energy, the overall noise is reduced. Therefore, it is possible to provide a garbage truck that can operate the loading device and the discharging device at an appropriate speed with low noise overall.

Instead of the PQ diagram of FIG. 10, the one shown in FIG. 11 may be used. In the PQ diagram shown in FIG. 11, even in the high speed setting for the discharge plate driving device 72 and the medium speed setting for the loading device 70, the discharge amount Q is constant in the entire range of P <P3. Also in this case, each device can be operated at an appropriate speed.
However, in the PQ diagram of FIG. 10, the maximum output is the same value (9 kW) in any of the high speed, medium speed, and low speed settings, but in the PQ diagram of FIG. The maximum output exceeds the maximum output (9 kW) of the low speed setting. That is, in the high speed setting,
P3 · Q3 = 18 × 10 ⁶ × 1.17 × 10 ⁻³
= 21.0 × 10 ³ [W] = 21.0 [kW]
It becomes. In the middle speed setting,
P3 · Q2 = 18 × 10 ⁶ × 0.83 × 10 ⁻³
= 14.9 × 10 ³ [W] = 14.9 [kW]
It becomes. Therefore, when a high output motor is required and the load on the loading device 70 and the discharge plate driving device 72 is increased, the operation noise of the device is increased. Therefore, control from the PQ diagram of FIG. 10 is more preferable in terms of noise prevention. However, as long as the load is not increased, control by the PQ diagram of FIG. 11 also contributes to low noise.

Next, a garbage truck according to the second embodiment will be described.
FIG. 12 is a side sectional view of a garbage truck according to the second embodiment. This garbage collection vehicle has a rotary plate type loading and a dump type dumping configuration.Therefore, the configuration as a loading device and a part of the configuration as a discharging device are different from the first embodiment, The swing cylinder 20 and the like as the input box drive device are the same as those in the first embodiment.
In the figure, as in the first embodiment, the garbage collection vehicle 1 includes a dust storage box 2 and a dust input box 3, and behind the dust input box 3, an input port 3a into which dust is input. Further, a lid 3b is provided for sliding the opening 3a up and down to open and close. An opening 3 d for loading the dust into the dust storage box 2 is formed in the lower front part of the dust throwing box 3. The dust box 3 can be rotated around a fulcrum (not shown) provided at the upper portion thereof, and can be opened and closed with respect to the dust container 2.

  In FIG. 12, the cylinder side base end portion 81a of the pushing cylinder 81 is pivotally attached to the left and right side walls 3c of the dust box 3, so that the pushing cylinder 81 can be rotated. The pushing plate 82 is formed by connecting the left and right side-shaped members as shown in the drawing with a plate or the like (not shown) extending in the vehicle width direction and integrated, and is attached to the side wall 3c. It can be rotated around a shaft 83. The upper end portion of the pushing plate 82 and the tip end portion of the piston rod of the pushing cylinder 81 are connected to each other by a pin 84. Thus, when the pushing cylinder 81 is extended, the pushing cylinder 81 itself rotates counterclockwise. While moving, the pushing plate 82 is rotated in the clockwise direction to be in a state indicated by a solid line in the figure. Further, when the pushing cylinder 81 contracts from that state, the pushing cylinder 81 itself turns in the clockwise direction while turning the pushing plate 82 in the counterclockwise direction, resulting in a state indicated by a two-dot chain line in the figure. .

  On the other hand, the rotating plate 85 extending in the vehicle width direction in the illustrated side surface shape is rotatable around a support shaft 86 that is rotatably attached to the side wall 3c around the axis (the clockwise direction is the normal rotation direction). .) The inner bottom surface 3 e of the dust box 3 is formed in an arc shape along the turning locus of the tip of the rotating plate 85.

  In the loading device 170 configured as described above, when dust is thrown into the dust throwing box 3, the rotating plate 85 rises to the illustrated position (position of approximately 9 o'clock) while stirring dust. When the rotary plate 85 comes to the position shown in the figure, the pushing plate 82 rotates clockwise from the position of the two-dot chain line to the position of the solid line, and the dust placed on the rotary plate 85 is accommodated in the dust. Push into box 2. Thereafter, the pushing plate 82 starts to rotate counterclockwise from the time when the rotating plate 85 exceeds the 12 o'clock position, and returns to the original position by the start of the next pushing operation. Such a periodic operation is performed in one cycle or a continuous cycle.

  On the other hand, a dump cylinder 87 is provided under the floor of the refuse storage box 2, and a cylinder-side base end portion 87 a is pivotally attached to the vehicle body frame F. Further, the piston rod side tip portion 87 b is pivotally attached to the lower surface of the dust container 2. The refuse storage box 2 has a structure capable of dumping (turning upward) about the support shaft 88. Similarly to the first embodiment, after the dust container 3 is rotated upward to open the dust container 2, the dump container 87 in the contracted operation state is extended, so that the dust container 2 is centered on the support shaft 88. As a result, the stored dust can be dumped and discharged.

  FIG. 13 is a hydraulic circuit diagram relating to the pushing cylinder 81, the dump cylinder 87, the swing cylinder 20, and the hydraulic motor 89 that rotates the rotating plate 85. The hydraulic circuit includes a tank 21, a hydraulic pump 22, a pushing cylinder solenoid valve 93, a hydraulic motor solenoid valve 94, a dump cylinder solenoid valve 95, and a swing cylinder solenoid valve (also serving as a tailgate lock solenoid valve) 27. The switching valve 32, the tailgate lock (cylinder) 42, the pressure sensor 44, the other pressure control valves 96 to 99, the check valves 43 and 100 to 105, the filter 40 and the like are connected as shown in the figure. The pressure sensor 44 constantly detects the operating pressure of the discharge oil passage of the hydraulic pump 22 and provides the detection output to the controller 50 as in the first embodiment.

  When the solenoid 93s of the push-in cylinder solenoid valve 93 is excited, the push-in plate 82 is in the position indicated by the two-dot chain line in FIG. 12, and is in the solid-line push-in position when the solenoid 93e is excited. The hydraulic motor 89 normally rotates when the solenoid 94n of the hydraulic motor electromagnetic valve 94 is excited, and rotates the rotating plate 85 in the clockwise direction of FIG. When the solenoid 94r is excited, it reverses. The dump cylinder 87 expands when the solenoid 95e of the dump cylinder solenoid valve 95 is excited, and contracts when the solenoid 95s is excited. The operations relating to the swing cylinder 20 and the tailgate lock 42 are the same as in the first embodiment.

  As in the first embodiment, the refuse collection vehicle 1 of the second embodiment configured as described above includes the solenoids 27e, 27s, 93e, 93s, 94n, 94r, 95e, 95s, and the switching valve 32. By the excitation and demagnetization by the controller 50, each operation of loading (rotation + pushing), input box driving (rotation), and storage box driving (dump) is performed. The synchronization between the rotary plate 85 and the push plate 82 is controlled in such a manner that the respective positions are detected by position sensors (limit switches, proximity switches, etc.) and the push plate 82 is synchronized with the movement of the rotary plate 85 by the controller 50. Is done.

  The operation switches are also provided in substantially the same manner as in the first embodiment. Among these, the main switch 51, the tailgate switch 52, the scraping switch 53, the discharge plate switch 54, the main lamp 60 and the lock lamp 61 are as follows. It is provided in a driver box (cab) switch box SB1 shown in FIG. The difference from FIG. 6 is that a dump switch 110 is provided instead of the discharge plate switch 54 (FIG. 6). When the dump switch 110 is operated to “up”, the garbage storage box 3 performs a dump operation, and returns to operation when the dump switch 110 is operated to “down”. In addition, it is a type of switch that returns to the neutral position of “OFF” when the hand is released.

  Next, the system configuration of the garbage truck according to the second embodiment for driving the hydraulic pump 22 will be described with reference to the block diagram of FIG. The difference from FIG. 7 is that the load of the hydraulic pump 22 is a rotary plate type loading device 170 that loads the dust thrown into the dust throwing box 3 into the dust receiving box 2, and the dust throwing box 3 is replaced with the dust receiving box. 2 and an input box driving device 171 that opens and closes (rotates up and down) (this is substantially the same as the input box driving device 71 of the first embodiment), and a storage that discharges the stored dust by a dumping operation. The point is that it is the box drive device 172, and the point that the dump switch 110 is provided instead of the discharge plate switch 54 (FIG. 7) as an input to the controller 50. The input box drive device 171 and the storage box drive device 172 are common in that they perform an operation for discharging the dust stored in the dust storage box 2, and both constitute a discharge device 173. I can say that.

  Next, the contents of control performed by the controller 50 regarding the operations of the loading device 170, the input box drive device 171 and the storage box drive device 172 will be described with reference to the flowcharts of FIGS. 16 and 17 divide one flowchart into two diagrams, and are connected to each other at A and B in the drawings. First, the flow of processing when the loading device 170 operates will be described. When operating the loading device 170, the main switch 51 is operated to the “loading” position.

  In step S1 of FIG. 16, the controller 50 determines whether or not the main switch 51 is “loading”. Here, since it is “loading”, the process proceeds to step S2. In step S2, the controller 50 enables the loading switch 55 and disables both the tailgate switch 52 and the dump switch 110. In this state, the controller 50 waits for the loading switch 55 to be turned on (repetition of S1 to S3). When the loading switch 55 is turned on, the controller 50 causes the inverter 66 to output AC power having a predetermined frequency. The control device 69 including the inverter 66 rotates the AC motor 67 at a predetermined rotational speed N2 corresponding to “medium speed” (step S4).

  From this state, the controller 50 starts the operation of the loading device 170, and the loading device 170 performs the aforementioned loading cycle operation (step S5). Immediately after the operation is started, the stop switch 57 is not normally turned on, so the controller 50 proceeds from step S6 to S7 and waits for one cycle to end (No in step S7, repeats S5 to S7). When completed, the process proceeds to step S8 to determine whether or not the loading mode is “continuous”. This loading mode is a setting of the single unit changeover switch 56. In the case of “continuous”, the process returns to step S5, and thereafter, the loading device 170 continues until the stop switch 57 is stopped. Operation is performed. When the stop operation is performed or when it is not “continuous” in step S8, the controller 50 stops the loading device 170 (step S9) and returns to step S1.

The rotational speed control of the AC motor 67 during the operation of the loading device 170 is performed according to the PQ diagram of FIG. In FIG. 18, the horizontal axis represents the operating pressure P [Pa] detected by the pressure sensor 44, and the vertical axis represents the discharge amount Q [m ³ / sec] of the hydraulic pump 22. The discharge amount Q is proportional to the rotational speed of the hydraulic pump 22, that is, the rotational speed of the AC motor 67. Although there are two patterns in the PQ diagram, the rotation speed control is performed on the loading device 170 according to the medium speed setting indicated as “loading device” in the drawing.

Specifically, the operating pressure represented by the signal input from the pressure sensor 44 is P [Pa], and the rotational speed represented by the signal input from the rotational speed sensor 68 is converted into a discharge amount to obtain Q [m ³ / Sec], as in the PQ diagram of the loading device of FIG. 10, when P ≦ P2 (10.8 MPa), Q = Q2 (0.83 × 10 ⁻³ m ³ / sec (50 liters / second) Min)). Therefore, the above-described rotation speed N2 is the rotation speed of the hydraulic pump 22 that can obtain the discharge amount Q2, and is the rotation speed of the AC motor 67. By controlling the medium speed setting as described above, it is possible to provide an optimal discharge amount for the operation of the loading device 170.

  When the operating pressure P exceeds P2, the discharge amount (rotation speed) is decreased in inverse proportion to the increase in the operating pressure P. As a result, the output PQ while the discharge amount is decreasing becomes a constant value. This point is also the same as the PQ diagram of the loading device of FIG. 10, and the controller 50 stops the AC motor 67 when the operating pressure P reaches P3 (18 MPa).

Next, the flow of processing when the input box driving device 171 operates will be described. When operating the input box driving device 171, the main switch 51 is operated to the “discharge” position.
In step S1 of FIG. 16, the controller 50 determines whether or not the main switch 51 is “loading”. Since the answer is no here, the process proceeds to step S10 of FIG. In step S10, the controller 50 determines whether or not the main switch 51 is “discharge”. Since the answer here is yes, the process proceeds to step S11. In step S11, the controller 50 disables the loading switch 55 and enables both the tailgate switch 52 and the dump switch 110. In this state, the controller 50 waits for the tailgate switch 52 or the dump switch 110 to be turned on (repetition of S13 and S20). In step S13, the tailgate switch 52 is operated to “up” or “down”. Then, the dump switch 110 is disabled to prevent simultaneous operation (step S14). Then, the controller 50 causes the inverter 66 to output AC power having a predetermined frequency, and thereby the control device 69 including the inverter 66 rotates the AC motor 67 at a predetermined rotation speed N1 corresponding to “low speed” (step). S15).

  From this state, the controller 50 starts the operation of the input box driving device 171 (step S16), and the dust input box 3 is rotated upward (or downward). When the tailgate switch 52 is turned “OFF”, the controller 50 stops the input box drive device 171 (step S18). Thereafter, the controller 50 enables the dump switch 110 (step S19) and returns to step S1.

The rotational speed control of the AC motor 67 during the operation of the input box drive device 171 is performed according to the low speed setting indicated as “dump input box” in the PQ diagram of FIG.
Specifically, the operating pressure represented by the signal input from the pressure sensor 44 is P [Pa], and the rotational speed represented by the signal input from the rotational speed sensor 68 is converted into a discharge amount to obtain Q [m ³ / Sec], when P <P3 (18 MPa), Q = Q1 (0.50 × 10 ⁻³ m ³ / sec (30 liters / min)). Therefore, the above-described rotation speed N1 is the rotation speed of the hydraulic pump 22 from which the discharge amount Q1 is obtained, and is the rotation speed of the AC motor 67. By such low-speed setting control, the opening operation (upward rotation) of the dust bin 3 can be made slower than the operation of the loading device 170. Thereby, the outstanding safety | security can be ensured similarly to 1st Embodiment. When the operating pressure P reaches P3 (18 MPa), the controller 50 stops the AC motor 67 (normally such a situation does not occur).

Next, the flow of processing when the storage box driving device 172 operates will be described. When the storage box driving device 172 is operated, the main switch 51 is operated to the “discharge” position.
In step S1 of FIG. 16, the controller 50 determines whether or not the main switch 51 is “loading”. Since the answer is no here, the process proceeds to step S10 of FIG. In step S10, the controller 50 determines whether or not the main switch 51 is “discharge”. Since the answer here is yes, the process proceeds to step S11. In step S11, the controller 50 disables the loading switch 55 and enables both the tailgate switch 52 and the dump switch 110. In this state, the controller 50 waits for the tailgate switch 52 or the dump switch 110 to be turned on (repetition of S13 and S20). In step S20, the dump switch 110 is operated to “up” or “down”. In order to prevent simultaneous operation, the tailgate switch 52 is disabled (step S21). Then, the controller 50 causes the inverter 66 to output AC power having a predetermined frequency, and thereby the control device 69 including the inverter 66 rotates the AC motor 67 at a predetermined rotation speed N1 corresponding to “low speed” (step). S22).

  From this state, the controller 50 starts the operation of the storage box driving device 172 (step S23), and the dust storage box 2 performs a dumping operation to discharge the dust or return from the completion of the discharge. When the dump switch 110 is turned “OFF”, the controller 50 stops the operation of the storage box drive device 172 (step S25). Thereafter, the controller 50 enables the tailgate switch 52 (step S26) and returns to step S1.

The rotational speed control of the AC motor 67 during the operation of the storage box drive device 172 is performed according to the above-described input box drive device 171 according to the low speed setting indicated as “dump input box” in the PQ diagram of FIG. Done as if.
By such low-speed setting control, the dump operation can be performed at a low speed as compared with the operation of the loading device 170. If the same medium speed as that of the loading device 170 is set or higher, a relatively fast dumping operation is performed, and the maximum dump angle (for example, about 45 degrees) is reached in a short time. However, if the dust is not discharged smoothly until the maximum dump angle is reached, in addition to the rearward movement of the center of gravity, the inertia balance at the moment when the dust storage box 2 stops tilting causes the weight balance of the entire vehicle to move backward. The vehicle may be greatly biased and the vehicle may roll backward. In order to avoid such a situation, conventionally, a so-called two-stage dump control in which the dumping operation is temporarily interrupted at the dumping intermediate angle and further tilted to the maximum dumping angle by the re-operation is performed. At low speed setting, the inertia force is originally small and the above situation does not occur. Therefore, safe dump operation and return operation can be performed without performing complicated two-stage dump control.

  As described above, each device can be operated at an appropriate speed by changing the rotational speed of the AC motor 67, that is, the discharge amount of the hydraulic pump 22 in accordance with the device to be driven. Moreover, since it is not necessary to generate useless hydraulic energy, the overall noise is reduced. Therefore, it is possible to provide a garbage truck that can operate the loading device and the discharging device at an appropriate speed with low noise overall.

Instead of the PQ diagram of FIG. 18, the one shown in FIG. 19 may be used. In the PQ diagram shown in FIG. 19, even in the medium speed setting for the loading device 170, the discharge amount Q is constant in the entire range of P <P3. Also in this case, each device can be operated at an appropriate speed.
On the other hand, in the PQ diagram of FIG. 18, the maximum output is the same value (9 kW) at both medium speed and low speed settings, but in the PQ diagram of FIG. The setting exceeds the maximum output (9 kW). That is, with medium speed settings,
P3 · Q2 = 18 × 10 ⁶ × 0.83 × 10 ⁻³
= 14.9 × 10 ³ [W] = 14.9 [kW]
It becomes. Therefore, when a high output motor is required and the load on the loading device 170 increases, the operation noise of the device increases. Therefore, the PQ diagram of FIG. 18 is more preferable in terms of noise prevention. However, as long as the load is not increased, control by the PQ diagram of FIG. 19 also contributes to low noise.

In each of the above embodiments, the AC motor 67 is used. However, the AC motor 67 is not limited to an AC motor, and any electric motor can be used. It is also possible to control the number of revolutions of the motor by changing.
Further, the pressure setting and the discharge amount setting in the PQ diagrams shown in FIGS. 10, 11, 18, and 19 are merely examples, and the set values can be selected as necessary.

In each of the above embodiments, the discharge amount is handled as an amount corresponding to the rotation speed of the AC motor, and the rotation speed sensor 68 detects the rotation speed corresponding to the discharge amount. However, instead of the rotation speed sensor, the hydraulic pump 22 A flow rate sensor that directly detects the discharge amount may be provided, and a desired discharge amount may be obtained by controlling the number of rotations of the motor while using the output as a feedback signal.
In each of the above embodiments, the engine is driven and power is supplied from the generator. However, it is also possible to stop the engine and supply power to the control device 69 from a battery (not shown).

  In the first embodiment, the discharge is performed by moving the discharge plate, and in the second embodiment, the discharge is performed by the dumping operation. However, reverse discharge methods may be employed.

It is side sectional drawing which shows the refuse collection vehicle by the 1st Embodiment of this invention. It is operation | movement explanatory drawing which extracted only the pushing board, the push cylinder, and the press cylinder from FIG. It is a rear view of the refuse collection vehicle by the said 1st Embodiment. It is a hydraulic circuit diagram of the refuse collection vehicle by the said 1st Embodiment. It is a control block diagram for operating each cylinder in the refuse collection vehicle by the said 1st Embodiment. It is a front view of the switch box of the refuse collection vehicle by the said 1st Embodiment provided in a driver's seat (cab). It is a block diagram which shows the system configuration | structure of the refuse collection vehicle by the said 1st Embodiment which drives a hydraulic pump. It is a flowchart (1/2) of the process performed by the controller of the garbage truck by the said 1st Embodiment. It is a flowchart (2/2) of the process performed by the controller of the garbage truck by the said 1st Embodiment. It is a PQ diagram used as the basis of the rotation speed control performed by the controller of the refuse collection vehicle by the said 1st Embodiment. It is an example of the other PQ diagram in the garbage truck by the said 1st Embodiment. It is side sectional drawing which shows the garbage truck by the 2nd Embodiment of this invention. It is a hydraulic circuit diagram of the refuse collection vehicle by the said 2nd Embodiment. It is a front view of the switch box of the refuse collection vehicle by the said 2nd Embodiment provided in a driver's seat (cab). It is a block diagram which shows the system configuration | structure of the refuse collection vehicle by the said 2nd Embodiment which drives a hydraulic pump. It is a flowchart (1/2) of the process performed by the controller of the garbage truck by the said 2nd Embodiment. It is a flowchart (2/2) of the process performed by the controller of the garbage truck by the said 2nd Embodiment. It is a PQ diagram used as the basis of the rotation speed control performed by the controller of the garbage truck by the said 2nd Embodiment. It is an example of the other PQ diagram in the garbage truck by the said 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dust collection truck 2 Dust storage box 3 Dust input box 22 Hydraulic pump 52 Tailgate switch (operation means)
54 Discharge plate switch (operating means)
55 Loading switch (operating means)
67 AC motor (electric motor)
69 Control device 70 Loading device 71 Input box drive device 72 Discharge plate drive device 73 Discharge device 110 Dump switch (operation means)
170 Loading device 171 Loading box driving device 172 Storage box driving device 173 Discharging device

Claims (4)

A dust bin,
A dust input box connected to the dust container;
An electric motor;
A hydraulic pump driven by the electric motor;
A loading device for performing an operation of loading the dust thrown into the dust throwing box into the dust containing box based on the hydraulic pressure of the hydraulic pump;
A discharge device that performs an operation for discharging the dust stored in the dust storage box based on the hydraulic pressure of the hydraulic pump;
Operation means for giving an operation start signal to each of the loading device and the discharging device;
And a control device that rotates the electric motor at a rotational speed corresponding to an operation started by the operation start signal. The discharge device includes an input box driving device that opens and closes the dust input box with respect to the dust storage box,
2. The garbage collection vehicle according to claim 1, wherein the control device makes the rotation speed of the electric motor smaller during operation of the input box driving device than during operation of the loading device. The discharge device includes a discharge plate driving device that pushes out the contained dust by moving the discharge plate,
The garbage collection vehicle according to claim 1 or 2, wherein the control device increases the number of rotations of the electric motor when the discharge plate driving device is operated than when the loading device is operated. The discharge device includes a storage box driving device that discharges the stored dust by a dumping operation of the dust storage box,
3. The garbage collection vehicle according to claim 1, wherein the control device makes the rotation speed of the electric motor smaller during operation of the storage box drive device than during operation of the loading device.

Images