JPH0585707U - Dust dumping control device for dust dump trucks - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to eliminate wasteful gaps due to the corrugated cardboard and efficiently store dust in the dust storage space when the dust is packed in the dust storage box of the dust truck. [Structure] A garbage collection box 1 and a garbage throwing box 2 on the garbage truck
And the garbage disposal box 2 are connected in series, and a garbage disposal device A for disposing the garbage in the garbage storage box 1 is disposed inside the garbage throwing box 2. The interior space of the dust storage box 1 is defined as the dust storage space 1a and the space 1 behind it.
A discharge plate 17 that is divided into b and b is provided, and the discharge cylinder 18 is configured to move the discharge plate 17 in the axle direction. A fourth switching valve V4 having a communication position for communicating the oil chamber of the back pressure side with the oil reservoir is arranged in the hydraulic circuit of the discharge cylinder 18, and the switching control means causes the dust packing device A to perform a dust packing operation, When the pressure acting on the dust packing device A reaches 110 kg / cm ² or more, the fourth switching valve v
4 is controlled so as to be positioned at the communication position only for 1 second.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dust packing control device for a garbage truck, and more particularly to a measure for efficiently packing large dust such as cardboard when packing dust.

[0002]

[Prior Art]

 Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2-117502, a dust container is provided on a vehicle body, and a dust container is connected to the dust container through a dust packing port. A dust stuffing device is provided in the box for stuffing dust thrown in from the dust throwing port into the dust stuffing space through the dust stuffing port, while dust stuffing is done inside the dust stuffing box to fill the internal space with dust. An exhaust plate, which is divided into a storage space and a space in front of it, is provided that is movable in the axial direction, and the exhaust cylinder is used to move the exhaust plate in the axial direction to increase or decrease the volume of the dust storage space. As a dust packing control device for vehicles, when packing dust into the dust container, the back pressure side oil chamber of the discharge cylinder is constantly kept at a high pressure, while the pressure acting on the dust packing device due to the packing of dust. Reaches or exceeds the specified value The electromagnetic switching valve is switched so that the oil chamber on the back pressure side of the discharge cylinder communicates with the oil reservoir for a certain period of time, and the discharge plate is automatically moved to the back side according to the jam of dust, and the dust storage space It is a well-known technique that the dust is stored in the dust storage space while being compressed by expanding the volume.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional ones, there were the following problems when dust was packed. In other words, when dust is packed in the dust storage space by the packing device, pressure is applied to the dust packing device and the discharge cylinder automatically moves forward, increasing the volume of the dust storage space. Therefore, the dust will be smoothly stored in the dust storage space.However, if the dust is cardboard, etc., the cardboard (dust) is packed into the dust storage space by the packing device because of its structure. However, even if the cardboard is not compressed in this way, if pressure is applied to the dust packing device, the discharge cylinder will automatically move forward for a certain period of time. become. As a result, the volume of the dust storage space will be expanded to the extent that there is a wasteful space due to the corrugated cardboard, and the dust will not be able to be packed even though there is room in the dust storage space. However, there was a problem that it could not be efficiently stored in the dust storage space.

The present invention has been made in view of the above problems, and an object thereof is to provide a means for improving the movement operation of the discharge plate at the time of dust clogging, so that the wasteful use of the dumbbell is prevented. The purpose is to eliminate the gap and efficiently store dust in the dust storage space.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a solution means devised by the invention of claim 1 is mounted on a vehicle body and has a dust storage box having a dust storage port at the rear, and tilts to the dust storage port of the dust storage box. A dust throwing box that is freely connected, a dust throwing device that is equipped inside the dust throwing box, and that puts the dust into the dust throwing box through the dust throwing port, and the inside of the dust throwing box And a discharge plate which is provided movably rearwardly and divides the internal space of the dust storage box into a dust storage space in which dust is packed by the dust packing device and a space in front of the dust storage space, and the discharge plate rearward. It is premised on a dust collection vehicle equipped with a discharge cylinder that is moved to change the volume of the dust storage space.

Further, as a dust packing control device for a dust collecting vehicle, a communication is provided in the hydraulic circuit of the discharge cylinder, and the back pressure side oil chamber of the discharge cylinder communicates with the oil reservoir via a predetermined resistance. Position the solenoid operated directional control valve and the solenoid operated directional control valve to the communicating position only momentarily when the pressure applied to the dust stuffing device reaches a specified value or more during the dust stuffing work by the dust stuffing device. And a switching control means for controlling so.

Further, the solution means devised by the invention of claim 2 limits the discharge cylinder and the switching control means of the invention of claim 1, and the discharge cylinder is operated by an electric circuit, The changeover control means is configured to be operated and controlled by a changeover switch provided in the electric circuit.

[0008]

[Action]

 With the above configuration, in the device according to claim 1, the dust packing device dedicated to packing dust such as cardboard that is packed with a wasteful gap is used to store dust through the dust packing port. During packing work in which dust is stored in the dust storage space of the box, for example, pressure that acts on the dust storage device when the dust storage device is used to store dust in the dust storage space and the dust storage device is not compressed. When the value reaches or exceeds the predetermined value, the switching control means positions the electromagnetic switching valve for a moment only at the communication position where the back pressure side oil chamber of the discharge cylinder communicates with the oil reservoir via the predetermined resistance. The discharge cylinder automatically moves to the back due to the uncompressed cardboard with only a momentary amount of movement, and the volume of the dust storage space becomes the cardboard. That useless Without being expansion while a gap, never fill the dust becomes impossible to leave the room in dust accommodating space.

Further, according to the second aspect of the invention, the switching control means for locating the electromagnetic switching valve at the communicating position only momentarily is controlled by the switching switch provided in the electric circuit for operating the discharge cylinder. During packing work in which dust that is difficult to compress, such as corrugated cardboard, is packed into the dust storage space by the dust packing device, operate the changeover switch to control the operation of the changeover control device, while removing dust that is easy to compress, such as garbage. During the packing operation of packing the dust in the dust storage space, the changeover switch can be operated so as not to control the operation of the changeover control means, and the dust can be efficiently stored in the dust storage space according to its type. To be done.

[0010]

[Effect of the device]

 As described above, according to the dust packing control device of the dust collecting vehicle according to the first aspect of the present invention, when the dust packing device is dedicated to packing dust such as cardboard, compression is performed during the dust packing operation. Uncompressed cardboard is controlled by the switching control means so that the electromagnetic switching valve is instantaneously positioned at the communicating position when the pressure acting on the dust packing device reaches a predetermined value or more due to dust that is difficult to handle. Since the amount of movement of the discharge cylinder to the inside by the small amount is set to a small amount, it is possible to prevent the dust from being unable to be packed in the dust storage space, and thus to efficiently store the dust in the dust storage space. You can

Further, according to the dust packing control device for the dust collecting vehicle in the invention of claim 2, the switching control means for instantaneously positioning the electromagnetic switching valve at the communicating position switches the electric circuit for operating the discharge cylinder. The switch controls the operation when packing difficult-to-compress dust such as corrugated cardboard, while not controlling the operation when packing easily-compressing dust such as kitchen dust. It can be efficiently housed in the dust storage space, and it is very advantageous for implementing two types of dust with one device and implementing it.

[0012]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, on a vehicle body of a refuse collection vehicle, a dust storage box 1 having a dust packing opening 3 for packing dust on the rear side of the vehicle is mounted. At the upper end of the dust packing port 3, a dust throwing box 2 is tiltably connected by a pivot 4.

The dust throwing box 2 is open at the front side of the vehicle body and communicates with the dust throwing port 3 of the dust throwing box 1, and a throwing port 5 for throwing dust is opened at the lower back side of the dust throwing box 2. A dust storage chamber 6 is formed in the dust collection box 6, and the dust deposit box 2 is equipped with a dust stuffing device A for compressing the dust and crushing it to stuff it into the dust storage box 1.

This dust packing device A is provided along both side walls of the dust throwing box 2, and is provided with a guide groove member 7 made of a channel steel inclined toward the rear lower part of the vehicle body. The pivot 4 is pivotally supported on the upper end of the groove member 7. On the other hand, an elevating plate 8 formed over the entire width is housed in the dust throwing box 2, and the upper and lower parts of the elevating plate 8 are freely rollable along the inner wall of the guide groove member 7. The guide roller 9 to be fitted is axially attached (the part indicated by the broken line in the figure). A pivot 16 is pivotally supported on the upper rear surface of the lift plate 8 via a bracket. The pivot 16 extends along the back surface of the guide groove member 7 and matches the sliding distance of the lift plate 8. It is configured to protrude beyond the inside of the dust throwing box 2 beyond the notch 10 formed in the side wall of the dust throwing box 2. As shown by the broken line in the figure, a pair of elevating cylinders 11 are provided along the inclination direction of the guide groove member 7 between the pivot 16 protruding outward and the lower outer side of the dust throwing box 2. By the expansion / contraction operation of the lifting cylinder 11, the lifting plate 8 is reciprocated along the guide groove member 7.

At the lower end of the elevating plate 8, a pushing plate 12 extending over the entire width of the dust throwing box 2 is pivotally supported back and forth, and the pushing plate 12 is A pair of push-in cylinders 15 are connected between the support piece 14 projecting from the rear side and the pivot 16 at the tip of the elevating cylinder 11, and the push-in cylinders 12 are extended and contracted by the push-in cylinders 15 to extend and retract the push-in plate 12. It is designed to swing back and forth around.

Next, in the dust storage box 1, the dust packed from the dust packing device A through the dust packing port 3 is discharged by the discharge plate 17 provided over the entire cross section thereof. It is divided into a dust storage space 1a to be stored and a rear space 1b thereof, and a discharge cylinder 18 for moving the discharge plate 17 in the axle direction is provided at a lower portion of the rear space 1b. The discharge cylinder 18 includes a base portion 18a, a first piston 18b that is extendable and retractable with respect to the base portion 18a, a second piston 18c that is extendable and retractable with respect to the first piston 18b, and a second piston 18c. It is a three-stage cylinder composed of a third piston 18d which is expandable and contractible. The base end of the base portion 18a is rotatably supported by a support member 21 provided below the discharge plate 17, and the tip of the third piston 18d is attached to the innermost portion of the inner space 1b. It is rotatably supported by a member 22, and when the discharge cylinder 18 extends, the discharge plate 17 is brought close to the dust packing port 3 of the dust storage box 1 to minimize the volume of the dust storage space 1a. On the other hand, when the discharge cylinder 18 retracts, the volume of the dust storage space 1a is increased.

Next, the hydraulic circuit of each cylinder will be described. FIG. 2 shows a piping system of a hydraulic circuit. P is a hydraulic pump, T is an oil reservoir, V1 is a first switching valve for operating the lifting cylinders 11 and 11, and V2 is the pushing cylinders 15 and 15. The second switching valve V3 for actuating, the third switching valve V3 for operating the discharge cylinder 18, the first switching valve V1 is the solenoids SOLc and SOLd, and the second switching valve V2 is the solenoids SOLe and SOLf. The third switching valve V3 has solenoids SO Lg and SOLh, respectively. The first and second switching valves V1 and V2 are connected in series to the hydraulic pump P, and the second and third switching valves V2 and V3 are connected in parallel to the hydraulic pump P.

Further, PS is a pressure switch connected to a circuit communicating with the piston back pressure side oil chamber of the pushing cylinder 15, and RV1 is pressure oil acting on the piston back pressure side oil chamber of the pushing cylinder 15 above a predetermined pressure. The RV2, which is a high-pressure relief valve that releases the pressure oil to the oil reservoir T when it reaches, releases the pressure oil to the oil reservoir T when the pressure acting on the piston back pressure side oil chamber of the discharge cylinder 18 reaches or exceeds a predetermined pressure. It is a high pressure relief valve.

On the other hand, the pipe line (see FIG. 1) connected to the piston back pressure side oil chamber of the discharge cylinder 18 through the tip of the third piston 18d of the discharge cylinder 18 and the connecting member 23 is the throttle 19 and normally its While it is connected to the oil reservoir T via a fourth switching valve V4 (electromagnetic switching valve) that is biased to a positive position to block the flow of pressure oil from the pipeline, the throttle 20 and normally from the pipeline Is connected to the oil reservoir T via a fifth switching valve V5 that is biased to a communication position that allows the pressure oil to flow. The fourth switching valve V4 has a solenoid SOLm, and the fifth switching valve V5 has a solenoid SOLn. When the pressure acting on the piston back pressure side oil chamber of the discharge cylinder 18 reaches a predetermined pressure (for example, 60 kg / cm ² ) or more in the circuit on the downstream side of the fifth switching valve V5, the pressure oil is discharged. A high pressure relief valve RV3 that opens to the oil reservoir T is connected.

Next, the electric circuit will be described with reference to FIG.

In FIG. 3, reference numeral 32 is a power supply line, 33 is an earth line, and for controlling the operation of each device of the above-mentioned refuse collection vehicle across the power supply line 32 and the earth line 33. Circuit is provided. In the figure, reference numeral 30a denotes a filling control circuit for causing the dust filling device A to perform the filling operation of the dust. The filling control circuit 30a has a filling switch SW3 for starting the filling operation. And the b contacts of the left and right stop switches SW4, SW15 and the first relay coil R1 are connected in series, and the a contact of the first relay coil R1 is provided in the power supply line 32. There is. A branch path 30a1 is provided between the packing switch SW3 and the stop switch SW15 of the packing control circuit 30a. The branch path 30a1 has an upper limit switch LS1 for detecting the upper limit position of the lift plate 8. B contact of the fifth relay coil R5, which will be described later, and a changeover switch SW16 (the interlocking side terminal becomes the energizing side) for switching the dust stuffing apparatus A to operate continuously or to operate only one cycle. Are connected in parallel, and the end thereof is connected to the first relay switch R1 on the terminal side opposite to the filling switch SW3.

30b is an inversion control circuit, and the inversion control circuit 30b is such that the a contact of the upper limit switch LS1, the b contact of the third relay coil R3, and the second relay coil R2 are connected in series. , The second relay switch R2 (a contact) is connected in parallel with the upper limit switch LS 1, and when the lift plate 4 moves to the lift limit position, the solenoid SOLf of the second switching valve V4 is energized (the circuit is omitted). The second switching valve V2 is switched so that the pushing plate 12 is reversed.

Reference numeral 30d denotes a crushing control circuit. The crushing control circuit 30d includes an a contact of a rear switch LS3 for detecting a rearward swing limit position of the pushing plate 12 and a b contact of a fourth relay coil R4 described later. And the third relay coil R3 are directly connected, the third relay switch R3 (a contact) is connected in parallel with the rear switch LS3, and the second timer T2 is connected to the fourth relay switch R4 and the third relay. It is connected in parallel with the coil R3, and in parallel with the second timer T2, a direct circuit of the second time delay relay coil X2 and the a contact of the second timer switch T2 for the time operation is connected. Further, 31d is a crushing drive circuit, and the crushing drive circuit 31d is connected in series with the third relay switch R3 (a contact) and the solenoid SOLd of the first switching valve V1.

That is, since the pushing plate 12 is reversed by the control of the reversing control circuit 30b and the rear switch LS3 is actuated when reaching the limit position, the crushing control circuit 30d is energized and the third relay R3 is turned on. At the same time, the third relay switch (contact b) R3 is opened in the reversal control circuit 30b to shut off the energization of the reversal control circuit 30b. As a result, the second switching valve V2 is returned to the center position, and at the same time, the solenoid SOLd is energized in the crushing drive circuit 31d, the first switching valve V1 is switched to the right side in the drawing, and the lift plate 8 is lowered, It is configured to crush the lower dust while holding the pushing plate 12 to be connected in a horizontal position.

Reference numeral 30e denotes a compression control circuit. In the compression control circuit 30e, the a contact of the lower limit switch LS 2, the fifth relay switch R5 (b contact), and the fourth relay coil R4 are connected in series. At the same time, the fourth relay switch R4 (a contact) and the second time delay relay switch X2 (a contact) are respectively connected in parallel with the a contact of the lower limit switch LS2, and the first timer T1 is connected to the fifth relay switch R5 and the The four-time relay coil R4 is connected in parallel, and the first timer T1 is connected in parallel with a series circuit of a first time-delay relay coil X1 and a contact point a of the first timer switch T1 for time-delay operation. On the other hand, 31e is a compression drive circuit, and the fourth drive switch R4 (a contact) and the solenoid SOLe of the second switching valve V2 are connected in series to the compression drive circuit 31e.

That is, when the pushing plate 12 is lowered by the control of the crushing control circuit 30d and reaches the lower limit position, the lower limit switch LS2 is actuated to close the a contact thereof, and the fourth relay coil R4 is closed. At the same time as self-holding via the a contact, the fourth relay switch R4 (b contact) of the crushing circuit 30d is opened to cut off the power supply to the third relay coil R3. As a result, the first switching valve V1 is returned to the center position, the solenoid e of the compression drive circuit 31e is energized, the pushing cylinder 15 is extended, and the pushing plate 12 is rotated around the shaft support 13 in the clockwise direction in FIG. The dust is oscillated and crushed temporarily in the previous stroke so as to be secondarily compressed between the pushing plate 12 and the flat end face of the bottom of the dust throwing box 2.

Reference numeral 30c denotes a jamming control circuit. The jamming control circuit 30c includes an a contact of a front switch LS4 for detecting a forward swing limit position of the pushing plate 12 and a b contact of a second relay switch R2. The contact, the b contact of the third relay switch, and the fifth relay coil R5 are connected in series, and the a contact of the fifth relay switch R5 and the a contact of the first time delay relay switch X1 are forward respectively. The switch LS4 is connected in parallel with the a contact, and a series circuit of the lower limit switch LS2 with the b contact and the fourth relay switch R4 with the b contact is connected in parallel with the front switch LS4. .. On the other hand, 31c is a packing drive circuit. The packing drive circuit 31c is connected with a fifth relay switch R5 (a-contact) and a solenoid SOLc of the first switching valve V1 in series, and Between the fifth relay switch R5 (a contact) and the solenoid SOLc and between the fourth relay switch R4 and the solenoid SOLe of the compression drive circuit 31e, the a contact and the fifth relay switch of a ninth relay switch R9, which will be described later, are arranged in series. It is connected through the contact b of the contact R5.

That is, when the pressing plate 12 swings forward and reaches the forward swing limit position by the control of the compression control circuit 30e, the forward switch LS4 operates and the fifth relay coil R5 self-holds in the energized state. At the same time, the power supply to the fourth relay coil R4 is cut off in the compression control circuit 30e. Then, the second switching valve V2 is returned to the center position, the first switching valve V1 is switched to the left position in the figure, the elevating cylinder 11 is extended, and the pushing plate 12 is kept vertical. The elevating plate 8 is raised so that the dust collected in the previous stroke is packed into the dust storage box 1 through the dust packing port 3.

The characteristic part of the present invention will be described below.

In FIG. 3, reference numerals 30m and 31n denote automatic reverse control circuits, respectively, and the one contact of the pressure switch PS and the ninth relay coil R9 are connected in series to one automatic reverse control circuit 30m. At the same time, the solenoid SOLn of the fifth switching valve V5 is connected to the other automatic reverse control circuit 31n. Further, 31m is an automatic back-and-forth drive circuit. The b contact and the solenoid SOLm of the fourth switching valve V4 are connected in series. The ends of the automatic reverse control circuits 30m and 31n and the end of the inversion control circuit 30b are connected via a changeover switch 35.

That is, during the dust packing process under the control of the packing control circuit 30c, when the selector switch 35 is in the ON state, the solenoid SOLn of the fifth selector valve V5 of the automatic reverse control circuit 31n is energized. By switching the fifth switching valve V5 to the left position in FIG. 2, the flow of pressure oil from the pipe line of the piston back pressure side oil chamber of the discharge cylinder 18 through the fifth switching valve V5 is blocked. When the detected pressure of the pressure switch PS arranged in the conduit communicating with the piston back pressure side oil chamber of the pushing cylinder 15 reaches a predetermined value (110 kg / cm ² ), the pressure switch P of the automatic reverse control circuit 30 m is The contact a of S is closed to energize the ninth relay coil R9, and the solenoid SOLm of the fourth switching valve V4 is energized in the automatic reverse drive circuit 31m to switch the fourth switching valve V4 to the left position in FIG. At the same time, the third timer switch T3 is energized. As a result, the back pressure side oil chamber of the discharge cylinder 18 is brought into communication with the oil reservoir T, the pressure oil flows to the oil reservoir T via the throttle 19, and the discharge cylinder 18 or the dust packing device A of the discharge plate 17 of the discharge plate 17 is discharged. The dust container box 1 can be automatically retracted to the back according to the dust packing, and the volume of the dust container space 1a of the dust container box 1 can be expanded. Then, when the set time of the third timer switch T3 (for example, an instant of about 1 second) elapses, the energization of the solenoid SOLm of the fourth switching valve V4 is cut off in response to the opening operation of the b contact of the third timer switch T3. Since the fourth switching valve V4 returns to the normal position, the back pressure side of the discharge cylinder 18 is maintained in the high pressure state. Thereafter, the pressure switch R9 detects a pressure equal to or lower than a predetermined pressure, the contact a is once opened, and this state is maintained until the pressure switch PS operates again. That is, every time the pressure switch PS detects a pressure of 110 kg / cm ² or more, the back pressure side oil chamber of the discharge cylinder 18 is communicated with the oil reservoir T only for one second, and the discharge plate 17 is automatically retracted backward from the opening 3. Thus, the volume of the dust storage chamber 1a is gradually increased, and the dust is stored under a substantially constant pressure.

On the other hand, when the changeover switch 35 is in the off state when dust is packed by the dust packing device A, the automatic retreat control circuit 30m is de-energized and at the same time the automatic retreat control circuit 31n moves to the fifth position. Since the switching valve V5 returns to the normal position, the pressure oil in the back pressure side oil chamber of the discharge cylinder 18 flows to the high pressure relief valve RV3 via the throttle 20 and the fifth switching valve V5, and this high pressure relief valve RV3 causes the discharge cylinder The back pressure of 18 is maintained in a low pressure state (about 60 kg / cm ² ). As a result, the discharge plate 17 automatically retracts to the back of the opening 3 in response to the dust packing by the dust packing device A, and the volume of the dust storage chamber 1a is expanded.

By the action of the change-over switch 35 in the ON state, a change-over control means for controlling the fourth change-over valve V4 to be positioned at the communicating position is constituted.

In FIG. 3, 31 h is a backward drive circuit for moving the discharge cylinder 18 backward from the opening 3, and 31 g is a forward drive circuit for moving the discharge cylinder 18 forward to the dust packing port 3 side. In the circuit, when the manual switch SW10 is switched, the solenoid SOLh or the solenoid SOLg of the third switching valve V3 is alternately energized to move the exhaust cylinder 18 forward and backward. Here, SW1 is a selection switch for selecting a dust packing operation or a dust discharging operation.

Therefore, in the above-described embodiment, by using the dust packing device A dedicated to packing dust such as danboll that is packed with a wasteful gap, the dust storage box 2 is passed through the dust packing port 3. During the packing work in which the dust is stored in the dust storage space 1a, the fourth switching valve V4 is switched by switching the switching switch 35 provided in the electric circuit for operating the discharge cylinder 18 to the on state or the off state. Since the switching control means that positions only the communication position for an instant of about 1 second is operated and controlled, switching control is performed at the time of packing work in which dust that is difficult to compress such as cardboard is packed into the dust storage space 1a by the dust packing device A. By operating the changeover switch 35 to the ON state so as to control the operation of the means, the pressure applied to the dust packing device A in a state where the cardboard is not compressed, that is, the pressure stroke. When the detected pressure of the switch PS reaches 110 kg / cm ² or more, the back pressure side oil chamber of the discharge cylinder 18 is in the communication position where it communicates with the oil reservoir T via the throttle 19, and the fourth switching valve only for one second. Controlled so that V4 is positioned. For this reason, the discharge cylinder 18 automatically moves inward by the uncompressed cardboard with only a small amount of movement instantaneously, and the volume of the dust storage space 1a is expanded with a wasteful space due to the cardboard. Therefore, it is possible to prevent dust from being jammed with a margin left in the dust storage space 1a. As a result, it is possible to efficiently store dust that is difficult to compress, such as cardboard, in the dust storage space 1a.

On the other hand, at the time of the packing work for packing easily-compressed dust such as raw garbage into the dust storage space 1a by the dust packing device A, the changeover switch 35 is turned off so as not to control the operation of the changeover control means. Then, by returning the fifth switching valve V5 to the normal position, the pressure oil in the back pressure side oil chamber of the discharge cylinder 18 is caused to flow to the high pressure relief valve RV3 via the throttle 20, and the high pressure relief valve RV3 causes the discharge cylinder 18 to move. Back pressure is maintained at a low pressure of about 60 kg / cm ² . For this reason, the discharge plate 17 automatically retracts to the back of the opening 3 in accordance with the packing of dust such as raw garbage by the dust packing device A, and the volume of the dust storage chamber 1a is expanded. As a result, it is possible to efficiently store easily-compressed dust such as garbage in the dust storage space 1a.

As a result, one dust stuffing apparatus A can handle two types of dusts of different types such as corrugated cardboard and kitchen garbage, which is very advantageous for implementation.

It should be noted that the present invention is not limited to the above-described embodiment, but includes various other modified examples. For example, in the above-described embodiment, the cardboard and the garbage collecting vehicle that also serves as the garbage are designed to efficiently accommodate two kinds of garbage such as cardboard and garbage, but the continuous changeover switch is in the ON state, that is, the automatic garbage collection vehicle. The end of the reverse control circuit and the end of the reversing control circuit are directly connected without a changeover switch, so that only dust that is difficult to compress, such as cardboard, is efficiently stored in the dust storage space. Needless to say, it may be a dedicated garbage car for cardboard.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a structure of a rear side of a refuse collecting vehicle according to an embodiment.

FIG. 2 is a piping system diagram of a hydraulic circuit.

FIG. 3 is a wiring diagram of an electric circuit.

[Explanation of symbols]

 A Dust packing device 1 Dust storage box 1a Dust storage space 1b Interior space 2 Dust input box 3 Dust packing port 17 Discharge plate 18 Discharge cylinder 35 Changeover switch V4 4th changeover valve (electromagnetic changeover valve) T Oil reservoir

Claims (2)

[Scope of utility model registration request] 1. A dust storage box mounted on a vehicle body and having a dust packing port in the rear, a dust throwing box that is tiltably connected to the dust packing port of the dust storing box, and the dust throwing box. And a dust packing device for packing dust into the dust storage box via the dust packing port, and an inner space of the dust storage box provided movably rearward inside the dust storage box. A discharge plate for partitioning a dust storage space into which dust is packed by the dust packing device and a space in front of it, and a discharge cylinder for moving the discharge plate rearward to change the volume of the dust storage space. In the dust collection vehicle, an electromagnetic switching valve, which is disposed in the hydraulic circuit of the discharge cylinder and has a communication position where the back pressure side oil chamber of the discharge cylinder communicates with the oil reservoir via a predetermined resistance, and the dust collection vehicle. When packing dust with the packing device, When the pressure acting on the packing device reaches a predetermined value or more, a switching control means is provided for controlling the electromagnetic switching valve to be positioned at the communicating position only momentarily. Control device. 2. The discharge cylinder is operated by an electric circuit, and the changeover control means is operated by a changeover switch provided in the electric circuit. Dust dumping control device for dust trucks.