JP2011148614A - Garbage input box and garbage collecting vehicle having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a garbage input box of a garbage collecting vehicle and the garbage collecting vehicle having the same, capable of eliminating a burden of opening-closing work of a door of a garbage input port by a worker. <P>SOLUTION: This garbage input box 5 of the garbage collecting vehicle 1 includes a tail gate 7 for opening-closing the garbage input port 6 by lifting, a door opening-closing arm 10 for lifting the tail gate 7, and a hydraulic cylinder 13 for operating the door opening-closing arm 10, and includes a PLC for stopping the hydraulic cylinder 13 after a predetermined time passes from an operation start of the hydraulic cylinder 13, a stopper respectively arranged in the uppermost position and the lowest position of the tail gate 7, and a relief valve for opening the valve when pressure oil for operating the hydraulic cylinder 13 becomes pressure of a predetermined value or more. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a dust collection vehicle that collects dust generated from homes, factories, etc., a dust collection box for throwing dust into a dust collection container installed in an exhibition hall, and the like, and a dust collection vehicle equipped with the same. .

  The garbage truck is equipped with a dust container box for containing the collected dust, and a dust container box is connected to the rear of the garbage container. The dust thrown into the dust throwing box is loaded toward the dust storage box by the dust loading device provided in the dust throwing box. In addition, a dust input port for supplying dust is provided on the rear surface of the dust input box. The dust inlet is provided with a door that closes the dust inlet so that dust, sewage, and the like are not scattered from the inside of the dust box while the dust truck is traveling.

  For example, in the garbage throwing box disclosed in Patent Document 1, a door that opens and closes the dust throwing opening by sliding up and down is provided at the dust throwing opening. When the door is slid downward, the dust inlet is closed, and when the door is slid upward, the dust inlet is opened. However, the door of such a dust input box is heavy, and this opening and closing work is a heavy burden on the operator.

  Therefore, an assist mechanism for reducing the burden on the worker has been developed. For example, the assist mechanism disclosed in Patent Documents 2 and 3 includes an arm, a slider, a tension coil spring, and the like, and applies assist force to the door of the dust inlet. This greatly reduces the force required to lift the door from the closed state and the support force required to gently close the door from the open state. Is greatly reduced.

JP 2005-314061 A JP 2007-269412 A JP 2008-285317 A

  However, in the dust box described in Patent Documents 2 and 3, although the burden on the operator is greatly reduced by the assist mechanism, the operator needs to open and close the door himself / herself.

  In view of the above, an object of the present invention is to provide a dust box that can eliminate the burden of opening and closing the door of the dust slot by an operator, and a dust collection vehicle including the dust box.

  The dust input box of the present invention is a dust input box of a dust collector equipped with a door that opens and closes a dust input port by raising and lowering, a door opening and closing arm that raises and lowers the door, and a hydraulic cylinder that operates the door opening and closing arm. Control means for stopping the hydraulic cylinder after a predetermined time has elapsed from the start of cylinder operation, stoppers provided at the uppermost position and the lowermost position of the door, and pressure oil for operating the hydraulic cylinder when the pressure exceeds a predetermined level And a relief valve for opening the valve.

  According to the present invention, until the predetermined time elapses, the door opening / closing arm is operated by the hydraulic cylinder to raise and lower the door and reach the stoppers respectively provided at the uppermost position and the lowermost position of the door. Since the pressure oil that activates the pressure exceeds a predetermined pressure, the relief valve opens and the pressure oil escapes, so that the door opening / closing arm does not move and the door does not move up and down any more. Then, the opening and closing operation of the door is completed by stopping the hydraulic cylinder after a predetermined time has elapsed from the start of the operation of the hydraulic cylinder. Also, if something such as an operator or dust is caught in the door, the relief valve opens and the hydraulic oil that operates the hydraulic cylinder escapes even before the predetermined time has elapsed. Ascent and descent stops. In addition, although raising / lowering of a door stops in the state in which an operator's limbs, dust, etc. were pinched | interposed, this operating force is adjusted so that it may not be injured to an operator's limb. In addition, after the operation is completed, the door is adjusted so that it can be easily opened manually, so that even if it is caught, the limb can be easily removed without injury.

  Further, the dust input box of the present invention includes a flow path switching valve for switching the flow path of the pressure oil to operate the hydraulic cylinder, and the flow path switching valve is configured to store the dust input from the dust input port. It is desirable to be provided in a state connected to a flow path switching valve group for actuating the dust loading device loaded by the pressure oil. Thereby, a flow-path switching valve is put together in one place, and a number of parts decreases.

  In the dust box according to the present invention, the control means preferably stops the hydraulic cylinder after a lapse of a predetermined time from the start of operation of the hydraulic cylinder until the door reaches the stopper. . As a result, resistance is applied when the door is opened and closed, and even if the time until the door reaches the stopper is extended more than expected, the door can be raised and lowered until a predetermined time elapses.

(1) From the start of the operation of the hydraulic cylinder in the garbage input box of the garbage collection vehicle provided with a door that opens and closes the dust inlet by raising and lowering, a door opening and closing arm that raises and lowers the door, and a hydraulic cylinder that operates the door opening and closing arm. Control means for stopping the hydraulic cylinder after elapse of a predetermined time, stoppers provided at the uppermost position and the lowermost position of the door, and a relief that opens when the pressure oil that operates the hydraulic cylinder reaches a predetermined pressure or more. By providing the valve, the dust inlet can be automatically opened and closed, and the burden of opening and closing the dust inlet door by the operator can be eliminated. In the unlikely event that an operator or garbage is caught in the door, the raising and lowering of the door stops even before a predetermined time has elapsed. Moreover, even if the operator's limbs are caught, the operating force is adjusted so as not to be so great that the limbs are injured, so the safety is high.

(2) A flow path switching valve that switches the flow path of pressure oil to operate the hydraulic cylinder is provided, and this flow path switching valve is a dust loading device that loads the dust thrown from the dust throwing port into the dust container. By being provided in a state of being connected to a flow path switching valve group that is operated by pressure oil, the flow path switching valves are gathered in one place and the number of parts is reduced, so that management is facilitated.

(3) Since the control means stops the hydraulic cylinder after elapse of a predetermined time from the start of operation of the hydraulic cylinder to the time when the door reaches the stopper, the control means resists when the door is opened and closed. Even if the time until the door reaches the stopper is extended more than expected, the door can be continuously raised and lowered until the predetermined time elapses, and the dust inlet can be opened and closed.

It is a left view of the garbage truck in embodiment of this invention. It is a rear view of the refuse collection vehicle of FIG. (A) is a left side view of the dust box of the garbage collection vehicle of FIG. 1, and is a view in which the left side is omitted so that the inside can be seen, and (b) is a view as seen from the arrow A in (a). It is the figure which abbreviate | omitted and represented the door. It is BB sectional drawing of Fig.3 (a). It is C arrow line view of Fig.3 (a). It is an A arrow skeleton figure of Drawing 3 (a). It is a hydraulic circuit diagram which shows a part of hydraulic circuit structure. It is an electric circuit diagram of a door automatic opening / closing device. It is a control flow diagram of PLC. It is the left view of the dust input box which shows another embodiment of this invention, Comprising: It is the figure which abbreviate | omitted the left side part so that the inside could be seen.

  FIG. 1 is a side view of a garbage truck in the embodiment of the present invention, and FIG. 2 is a rear view of the garbage truck in FIG. 3 (a) is a left side view of the dust collection box of the garbage truck shown in FIG. 1, and the left side is omitted so that the inside can be seen. FIG. 3 (b) is a view of arrow A in FIG. It is a figure, Comprising: It is the figure which abbreviate | omitted the door. 4 is a cross-sectional view taken along the line BB of FIG. 3A, FIG. 5 is a view as viewed from the arrow C, and FIG. 3 to 6 show orthogonal three axes XYZ common to the respective drawings.

  1 and 2, the garbage truck 1 according to the embodiment of the present invention has a driver's seat 3 disposed at the front of a vehicle body 2 and a dust container 4 mounted on the rear thereof. A dust input box (hopper) 5 is continuously provided behind the dust container 4. In the garbage throwing box 5, a conventionally well-known dust loading device (not shown) is provided. In the rear part of the dust input box 5, a substantially rectangular dust input port 6 for supplying dust is opened.

  The dust thrown in from the dust throwing-in port 6 is loaded on the dust container 4 side by a dust loading device. In addition, a discharge plate (not shown) is slidably disposed in the garbage storage box 4 in the longitudinal direction of the vehicle body. The discharge plate is a plate-like body formed to have substantially the same size as the horizontal width and vertical height in the dust container box 4. The discharge plate gradually moves forward when dust is loaded, and moves backward when discharging.

  The dust inlet 6 is provided with a tailgate 7 as a door for opening and closing the dust inlet 6 by raising and lowering in order to prevent dust, sewage and the like from scattering from the dust box 5 during traveling. It has been. The tailgate 7 is slidable up and down, and the dust inlet 6 is opened by moving above the dust inlet 6.

  The tailgate 7 has a shape corresponding to the shape of the dust inlet 6 and is a thin plate that is curved to match the shape of the rear surface of the dust input box 5 and a reinforcing frame fixed to the back of the thin plate. Etc. As shown in FIG. 3, a pair of left and right side plates 8 (the left side plate is not shown) of the dust input box 5 is an upper guide rail having a U-shaped cross section for guiding the tailgate 7. 9a and a lower guide rail 9b are provided.

  Guides 7 a are provided at the four corners of the tailgate 7. Each guide 7a is fitted into the upper and lower guide rails 9a and 9b so as to be freely rollable. As a result, the tailgate 7 moves up and down along the upper and lower guide rails 9a and 9b. Further, stoppers 15a and 15b are provided at the upper and lower ends of the lower guide rail 9b, respectively. The guide 7a abuts against these stoppers 15a and 15b, and the tailgate 7 can be held in the open position or the closed position.

  Furthermore, the dust input box 5 in this embodiment includes an automatic door opening / closing device that automatically raises and lowers the tailgate 7 to open and close the dust input port 6 without requiring the arm strength of the operator. The automatic door opening / closing device includes a door opening / closing arm 10, a slider 11 (see FIG. 4), a tension coil spring 12, a hydraulic cylinder 13, and the like.

  The door opening / closing arm 10 raises and lowers the tailgate 7 by the expansion / contraction operation of the hydraulic cylinder 13. One end side of the door opening / closing arm 10 is rotatably connected to the side plate 8 via a pin joint 10a having an axis line arranged in a direction substantially perpendicular to the moving direction of the tailgate 7 (Z-axis direction). On the other hand, the other end of the door opening / closing arm 10 rotates to the back surface of the tailgate 7 via a pin joint 10b having an axis line in the Y-axis direction, a pin joint 10c having an axis line in the Z-axis direction, and a slider 11 described later. And it is connected so as to be movable in the vehicle width direction (X-axis direction). The pin joint 10c is provided on the tip side from the pin joint 10b. As a result, the door opening / closing arm 10 is rotated around the pin joint 10a which is the connecting position on one end side in conjunction with the raising / lowering operation of the tailgate 7.

  As shown in FIG. 4, the slider 11 includes a slide shaft 11a, a cylindrical portion 11b, a connecting pin 11c, and the like. The slide shaft 11a is made of a straight shaft fixed to the upper part of the rear surface of the tailgate 7, and extends in the vehicle width direction (X-axis direction). The cylindrical portion 11b is fitted on the slide shaft 11a so as to be slidable along the longitudinal direction of the slide shaft 11a and to be rotatable around the axis of the slide shaft 11a. The connecting pin 11c protrudes from the outer peripheral portion of the cylindrical portion 11c so that its axis is orthogonal to the longitudinal direction of the slide shaft 11a. The connecting pin 11c also serves as the above-described pin joint 10c.

  The tension coil spring 12 (biasing member) is hooked (connected) to a hooking portion 10 d fixed to the upper side of the middle portion of the door opening / closing arm 10 with a hook 12 a on one end side. The hook 12b on the other end side of the tension coil spring 12 is hooked (connected) to a spring hooking portion 14 fixed on the side plate 8 at a position higher than the base end portion (pin joint 10a) of the door opening / closing arm 10. ) Thereby, the tension coil spring 12 urges the door opening / closing arm 10 in a direction in which the door opening / closing arm 10 rotates upwardly about the pin joint 10a which is a connecting position on one end side thereof. The tension coil spring 12 is provided so that tension is always generated regardless of the elevation position of the tailgate 7.

  The hydraulic cylinder 13 operates the door opening / closing arm 10 by its extension operation. The end of the cylinder, which is one end of the hydraulic cylinder 13, is rotatably connected to the side plate 8 via a pin joint 13a having an axis line in the Z-axis direction. However, this pin joint 13a is installed below the above-mentioned pin joint 10a. On the other hand, the end portion of the rod that is the other end side of the hydraulic cylinder 13 is rotatably connected to the lower side of the middle portion of the door opening / closing arm 10 via a pin joint 13b having an axis line in the Z-axis direction.

  When the hydraulic cylinder 13 provided in this way extends, the hydraulic cylinder 13 and the door opening / closing arm 10 rotate upward around the pin joint 13a and the pin joint 10a, respectively. The door opening / closing arm 10 that pivots upward raises the tailgate 7 via the slider 11. On the other hand, when the hydraulic cylinder 13 contracts, the hydraulic cylinder 13 and the door opening / closing arm 10 rotate downward around the pin joint 13a and the pin joint 10a, respectively. The door opening / closing arm 10 that pivots downward lowers the tail gate 7 via the slider 11.

  Next, the hydraulic system of the hydraulic cylinder 13 will be described. FIG. 7 is a hydraulic circuit diagram showing a part of the hydraulic circuit configuration of the garbage truck 1 in this embodiment. As shown in FIG. 7, in the refuse collection vehicle 1 in this embodiment, the dust input box 5 is locked and opened, the sliding plate constituting the dust loading device is raised and lowered, and the compression plate is compressed and reversed. The hydraulic pressure switching unit 20 includes flow path switching valve groups 20a, 20b, 20c, and 20d for respectively operating hydraulic cylinders (not shown) for performing the front and rear movements of the discharge plate in the dust container 4 respectively. It has.

  In the present embodiment, the flow path switching valve 20e for operating the hydraulic cylinder 13 is also provided in a state connected to the flow path switching valve groups 20a to 20d. Including the hydraulic pressure switching unit 20. Pressure oil (hydraulic oil) is supplied from the reservoir 21 to the hydraulic pressure switching unit 20 through the input pipe 23 by the hydraulic pump 22. The hydraulic oil returns from the hydraulic pressure switching unit 20 to the reservoir 21 through the return pipe 24. The hydraulic pump 22 is driven by power extracted from an engine (not shown) of the garbage truck 1 by a power take-out device (PTO).

  A two-position two-port first switching valve 30 and a second switching valve 31 are connected to the two ports on the discharge side of the flow path switching valve 20e. The first and second switching valves 30 and 31 are poppet type electromagnetic switching valves and have a feature that the internal leak is very small.

  The first switching valve 30 and the rod-side port 13c of the hydraulic cylinder 13 are connected via a one-way throttle valve 32 that is arranged so as to allow the flow toward the hydraulic cylinder 13 side. The second switching valve 31 and the head side port 13d of the hydraulic cylinder 13 are connected via a one-way throttle valve 33 arranged to allow the flow to the hydraulic cylinder 13 side.

  In this hydraulic circuit, pressure oil releasing means is provided so that the pressure oil on the head side and the rod side of the hydraulic cylinder 13 can be released at any time. The pressure oil releasing means shown in FIG. 7 includes an erected pipe 34a, a first on-off valve 35a, a second on-off valve 35b, a drain pipe 34b, and the like. The installation pipe 34 a is provided so as to communicate with the rod side port 13 c and the head side port 13 d of the hydraulic cylinder 13. The first on-off valve 35a is interposed in the midway position of the installation pipe 34a. The drain pipe 34 b is provided so that the rod side port 13 c of the hydraulic cylinder 13 communicates with the reservoir 21. The second on-off valve 35b is interposed in the middle of the drain pipe 34b.

  By opening the two on-off valves 35a and 35b of the pressure oil release means, the pressure oil on the head side and the rod side of the hydraulic cylinder 13 is released, and a tailgate (in FIG. It is indicated as “T / G”.) 7 can be easily moved up and down by manual operation. The pressure oil releasing means may be any means that releases the pressure of the hydraulic oil on the head side and the rod side of the hydraulic cylinder 13 so that the rod of the hydraulic cylinder 13 can freely expand and contract.

  Further, in this hydraulic circuit, the valve is opened when the pressure oil supplied between the flow path switching valve 20e and the first and second switching valves 30, 31 becomes a pressure equal to or higher than a predetermined set pressure. Relief valves 36a and 36b are respectively provided. As a result, when the pressure oil on the head side and the rod side of the hydraulic cylinder 13, that is, the pressure oil that operates the hydraulic cylinder 13 becomes a pressure higher than a predetermined pressure, the relief valves 36a and 36b are opened, respectively. Returned to the return pipe 24.

  Next, the switching operation of each valve when the hydraulic cylinder 13 is expanded and contracted will be described.

  When extending the hydraulic cylinder 13, the first and second on-off valves 35a and 35b are closed and the hydraulic pump 22 is driven. Then, the flow path switching valve 20e is switched to the a position, the first switching valve 30 is switched to the b position, and the second switching valve 31 is switched to the a position. Then, the hydraulic oil supplied from the hydraulic pump 22 through the input pipe 23 is supplied to the head side port 13d of the hydraulic cylinder 13, and the hydraulic oil is returned from the rod side port 13c of the hydraulic cylinder 13 to the return pipe 24. The rod of the hydraulic cylinder 13 extends.

  When the extension operation of the hydraulic cylinder 13 is stopped, the flow path switching valve 20e is switched to the c position and the first switching valve 30 is switched to the a position from the above state. Then, the supply of the hydraulic oil to the head side port 13d of the hydraulic cylinder 13 is stopped, and the escape path for the hydraulic oil of the rod side port 13c and the head side port 13d is closed. As a result, the hydraulic cylinder 13 stops extending and maintains its state. Further, by holding the first and second switching valves 30 and 31 at the position a, the internal leak is extremely reduced, and the hydraulic cylinder 13 contracts and the tail gate 7 is prevented from being lowered. .

  On the other hand, when the hydraulic cylinder 13 is contracted, the flow path switching valve 20e is switched to the b position from the stop state, the first switching valve 30 is held at the a position, and the second switching valve 31 is switched to the b position. . Then, the hydraulic oil supplied from the hydraulic pump 22 through the input pipe 23 is supplied to the rod side port 13c of the hydraulic cylinder 13, and the hydraulic oil is returned from the head side port 13d of the hydraulic cylinder 13 to the return pipe 24. The rod of the hydraulic cylinder 13 contracts.

  When stopping the contraction operation of the hydraulic cylinder 13, from the above state, the flow path switching valve 20e is switched to the c position, and the second switching valve 31 is switched to the a position. Then, the supply of hydraulic oil to the rod side port 13c of the hydraulic cylinder 13 is stopped, and the escape path for the hydraulic oil in the rod side port 13c and the head side port 13d is closed. As a result, the hydraulic cylinder 13 stops its contraction operation and maintains its state.

  Here, the electric circuit configuration of the automatic door opening and closing device will be described with reference to FIG. FIG. 8 is an electric circuit diagram of the automatic door opening / closing device.

  In FIG. 8, the ascending button 41 and the descending button 42 are switches for raising and lowering the tailgate 7, and are provided on the side of the garbage throwing box 5. The ascending button 41 and the descending button 42 are connected to a PLC (programmable logic controller) 40 as control means. The solenoids 25a and 25b are actuators that actuate the above-described flow path switching valve 20e. Solenoids 30a and 31a are actuators that actuate the first and second switching valves 30 and 31, respectively.

  The PLC 40 energizes the solenoids 25a and 30a when the ascending button 41 is pressed. Thereby, the flow path switching valve 20e is switched to the a position, the first switching valve 30 is switched to the b position, and the second switching valve 31 is held at the a position. Further, the PLC 40 energizes the solenoids 25b and 31a when the lowering button 42 is pressed. Thereby, the flow path switching valve 20e is switched to the b position, the first switching valve 30 is held at the a position, and the second switching valve 31 is switched to the b position.

  When neither the ascending button 41 nor the descending button 42 is pressed, the PLC 40 does not energize any of the solenoids 25a, 25b, 30a, 31a, and the flow path switching valve 20e is in the neutral c position. The switching valve 30 is held in the a position, and the second switching valve 31 is held in the a position. Thus, the switching of the flow path switching valve 20e, the first switching valve 30 and the second switching valve 31 is performed by the PLC 40 in conjunction with the operation of the ascending button 41 and the descending button 42.

  Further, the PLC 40 monitors the elapse of a predetermined time after the ascending button 41 and the descending button 42 are pressed, and deenergizes the solenoids 25a, 25b, 30a, 31a after the elapse of the predetermined time from the start of the operation of the hydraulic cylinder 13. State. As a result, the flow path switching valve 20e is switched to the neutral c position, the first switching valve 30 is switched to the a position, the second switching valve 31 is switched to the a position, and the hydraulic cylinder 13 stops.

  Next, the raising and lowering operation of the tailgate 7 that opens and closes the dust inlet 6 will be described with reference to the skeleton diagram of FIG. 6, the hydraulic circuit diagram of FIG. 7, and the control flow diagram of the PLC 40 of FIG.

  FIG. 6A shows a state where the hydraulic cylinder 13 is contracted most and the tailgate 7 is lowered to the lowest position. At this time, when neither the ascending button 41 nor the descending button 42 is pressed, the flow path switching valve 20e is in the neutral c position, the first switching valve 30 is in the a position, and the second switching valve 31 is in the a position. When the elevating position of the tailgate 7 is fixed in this state, the first and second on-off valves 35a and 35b are kept closed.

  When the tailgate 7 is raised from the state of FIG. 6A and the dust inlet 6 is opened, the raising button 41 is pressed. When the ascending button 41 is pressed (S100 in FIG. 9), the PLC 40 energizes the solenoids 25a and 30a (S101). Thereby, the flow path switching valve 20e is switched to the a position, the first switching valve 30 is switched to the b position, and the second switching valve 31 is held at the a position. Then, the hydraulic cylinder 13 is extended, and the door opening / closing arm 10 is rotated upward about the pin joint 10a in conjunction with the extension operation.

  And the tailgate 7 connected with the front-end | tip part of the door opening / closing arm 10 raises as shown in FIG.6 (b). At this time, the PLC 40 monitors the elapse of a predetermined time (S102), and continues energization of the solenoids 25a and 30a until the elapse of the predetermined time (S101). Finally, as shown in FIG. 6C, the tailgate 7 reaches the uppermost stopper 15a, and the dust inlet 6 is fully opened.

  In the PLC 40, as the predetermined time to be monitored in S102, from the start of the operation of the hydraulic cylinder 13 at the lowest position shown in FIG. 6A, the tailgate 7 shown in FIG. A time is set by adding a predetermined time to the time until reaching. Therefore, even after the tailgate 7 reaches the uppermost stopper 15a, the PLC 40 continues to energize the solenoids 25a and 30a. However, since the tailgate 7 has reached the stopper 15a, the door opening / closing arm 10 is no longer. The hydraulic cylinder 13 stops extending, and the pressure on the head side increases.

  When the pressure on the head side of the hydraulic cylinder 13 becomes equal to or higher than a predetermined pressure, the relief valve 36 b is opened and the hydraulic oil is returned to the reservoir 21 through the return pipe 24. Thereafter, when a predetermined time has elapsed (S102), the PLC 40 stops energizing the solenoids 25a and 30a (S103). As a result, the flow path switching valve 20e is switched to the neutral c position, the first switching valve 30 is switched to the a position, the second switching valve 31 is switched to the a position, the hydraulic cylinder 13 maintains the stopped state, and the tailgate 7 is fixed at the uppermost position. Thereby, the dust throwing-in work to the dust throwing inlet 6 becomes possible.

  Next, when the tailgate 7 is lowered and the dust inlet 6 is closed, for example, when the dust throwing operation is completed, the lowering button 42 is pressed in the state shown in FIG. When the lowering button 42 is pressed (S100), the PLC 40 energizes the solenoids 25b and 31a (S101). Thereby, the flow path switching valve 20e is switched to the b position, the first switching valve 30 is held at the a position, and the second switching valve 31 is switched to the b position. Then, the hydraulic cylinder 13 contracts, and the door opening / closing arm 10 rotates downward about the pin joint 10a in conjunction with the contraction operation.

  As a result, the tailgate 7 connected to the tip of the door opening / closing arm 10 is lowered from the highest position shown in FIG. 6C as shown in FIG. At this time, the PLC 40 monitors the elapse of a predetermined time (S102), and continues energization of the solenoids 25b and 31a until the elapse of the predetermined time (S101). Finally, as shown in FIG. 6A, the tailgate reaches the stopper 15b at the lowest position, and the dust inlet 6 is fully closed.

  Note that the PLC 40 has a predetermined time to be monitored in S102 from the start of the operation of the hydraulic cylinder 13 at the uppermost position shown in FIG. 6C until the tailgate 7 shown in FIG. 6A reaches the stopper 15b. A predetermined time is added to the above time. Therefore, even after the tailgate 7 reaches the stopper 15b, the PLC 40 continues to energize the solenoids 25b and 31a. However, since the tailgate 7 has reached the stopper 15b, the door opening / closing arm 10 rotates further. The hydraulic cylinder 13 stops the contraction operation and the pressure on the rod side increases.

  When the pressure on the rod side of the hydraulic cylinder 13 becomes equal to or higher than a predetermined pressure, the relief valve 36 a is opened, and the hydraulic oil is returned to the reservoir 21 through the return pipe 24. Thereafter, when a predetermined time has elapsed (S102), the PLC 40 stops energizing the solenoids 25b and 31a (S103). As a result, the flow path switching valve 20e is switched to the neutral c position, the first switching valve 30 is switched to the a position, the second switching valve 31 is switched to the a position, the hydraulic cylinder 13 maintains the stopped state, and the tailgate 7 is fixed at the lowest position. As a result, the tailgate 7 does not open due to vibrations or the like while the garbage truck 1 is traveling, and it is possible to travel safely.

  According to the dust input box 5 of the dust collection vehicle 1 described above, the tailgate 7 of the dust input port 6 can be automatically opened and closed by the expansion and contraction force of the hydraulic cylinder 13, so that the tailgate 7 of the operator can be opened and closed. The burden of opening and closing work can be eliminated. In addition, in the dust box 5, the relief valves 36a and 36b are activated even if an operator, dust, or the like is caught in the tailgate 7, but the operator's limbs are injured. The operating force is not so large, and the raising and lowering of the tailgate 7 is stopped, so that the safety is high. Further, when the operator's limbs are sandwiched, the tailgate 7 may be lifted and lowered once to the safe side to eliminate the state where the limbs are sandwiched.

  Further, in the dust box 5, the PLC 40 stops the hydraulic cylinder 13 after a predetermined time has elapsed from the start of the operation of the hydraulic cylinder 13 until the tailgate 7 reaches the stopper 15a or 15b. As a result, resistance is added when the tailgate 7 is opened and closed, and even if the time until the tailgate 7 reaches the stopper 15a or 15b extends more than expected, the tailgate 7 is raised and lowered until a predetermined time elapses. Therefore, the dust inlet 6 can be opened and closed reliably.

  Further, tension is always generated in the tension coil spring 12 regardless of the elevation position of the tailgate 7. That is, the tension of the tension coil spring 12 works to support a part or all of the load of the tailgate 7. Therefore, compared with the case where the tension coil spring 12 is not provided, the burden on the hydraulic cylinder 13 is reduced, so that the cylinder diameter of the hydraulic cylinder 13 can be reduced.

  In addition, as shown in FIG. 7, in the dust box 5, the hydraulic circuit is provided with hydraulic release means including the first and second release valves 35a and 35b. When the opening and closing of the tailgate 7 due to the expansion and contraction force of the hydraulic cylinder 13 becomes impossible due to the failure of 25a, 25b, 30a, 31a, etc.), by opening the first and second release valves 35a, 35b, The tailgate 7 can be opened and closed manually. In this case, the tension of the tension coil spring 12 works so as to always support a part or all of the load of the tailgate 7, so that the operator can raise and lower the tailgate 7 relatively easily.

  In the above-described embodiment, an example in which the door opening / closing arm 10 is installed on the rear surface of the dust input box 5 has been described. However, the present invention also applies to a case where the door opening / closing arm is installed on the side surface of the dust input box 5. Applicable. For example, the present invention can be applied to a dust box as shown in FIG.

  In FIG. 10, reference numeral 52 denotes a door opening / closing arm, one end of which is rotatably supported on the side surface of the dust box 50, and the other end is rotatably connected to the upper end side of the tailgate 51. As the door opening / closing arm 52 rotates about the fulcrum 52a, the tailgate 51 moves up and down. Reference numeral 53 denotes a tension coil spring, one end of which is hooked at a midway position of the door opening / closing arm 52, and the other end is hooked at a predetermined position on the side surface of the dust box 50. The door opening / closing arm 52 is urged in the upward rotating direction by the elastic force of the tension coil spring 53.

  Reference numeral 54 denotes a hydraulic cylinder. One end of the hydraulic cylinder 54 is rotatably connected to the side surface of the dust box 50, and the other end is rotatably connected to an intermediate portion of the door opening / closing arm 52. The hydraulic system of the hydraulic cylinder 54 is the same as that shown in FIG.

  When the hydraulic cylinder 54 extends, as shown by a two-dot chain line, the hydraulic cylinder 54 and the door opening / closing arm 52 rotate upward around the fulcrum 54a and the fulcrum 52a, respectively, and raise the tailgate 51. On the other hand, when the hydraulic cylinder 54 contracts, the hydraulic cylinder 54 and the door opening / closing arm 52 rotate downward around the fulcrum 54a and the fulcrum 52a, respectively, and lower the tailgate 51.

  In the present embodiment, the dust collection vehicle 1 in which the dust storage box 4 and the dust input box 5 are mounted on the vehicle body 2 has been described, but the dust input container 4 and the dust input box 5 constitute a dust collection container. It is also possible. This garbage collection container can be used in the same manner as the garbage collection vehicle 1 so that it can be loaded and unloaded on a transport vehicle.

  INDUSTRIAL APPLICABILITY The present invention is useful for a dust collection vehicle for collecting dust generated from homes, factories, and the like, a dust input box for inputting dust into a dust collection container, and the like, and a dust collection vehicle equipped with the same.

DESCRIPTION OF SYMBOLS 1 Dust collection vehicle 2 Car body 3 Driver's seat 4 Dust storage box 5,50 Dust input box 6 Dust input port 7,51 Tailgate 8 Side plate 10,52 Door open / close arm 11 Slider 12,53 Tension coil spring 13,54 Hydraulic cylinder 14 Spring locking part 15a, 15b Stopper 20 Hydraulic switching part 20a, 20b, 20c, 20d, 20e Flow path switching valve 21 Reservoir 22 Hydraulic pump 25a, 25b, 30a, 31a Solenoid 30 First switching valve 31 Second switching valve 32, 33 One-way throttle valve 35a First on-off valve 35b Second on-off valve 36a, 36b Relief valve 40 PLC
41 Button for ascending 42 Button for descending

Claims (4)

A door that opens and closes the dust inlet by raising and lowering;
A door opening and closing arm for raising and lowering the door;
In a garbage throwing box provided with a hydraulic cylinder for operating the door opening and closing arm,
Control means for stopping the hydraulic cylinder after elapse of a predetermined time from the start of operation of the hydraulic cylinder;
Stoppers provided respectively at the uppermost position and the lowermost position of the door;
A garbage throwing box provided with a relief valve that opens when the pressure oil that operates the hydraulic cylinder reaches a predetermined pressure or higher. A flow path switching valve that switches the flow path of the pressure oil to operate the hydraulic cylinder;
The flow path switching valve is provided in a state connected to a flow path switching valve group for operating a dust loading device for loading the dust thrown in from the dust inlet into the dust container with pressure oil. The refuse input box according to claim 1. The said control means stops the said hydraulic cylinder after progress of the time which added predetermined time to the time until the said door reaches | attains the said stopper from the operation start of the said hydraulic cylinder. Dust input box.   A refuse collection vehicle comprising the refuse input box according to any one of claims 1 to 3.

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