JP2018052725A - Garbage collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To load a garbage which can be compressed at a relatively high compression rate into a garbage collector while compressing efficiently.SOLUTION: A garbage collector 100 includes a garbage housing box 2, a garbage feeding box 3, a garbage loading device A having a compression plate 14, and an a discharge cylinder 19 which changes volume of a garbage housing space by moving a discharge plate 18 along a longitudinal direction of a car body. A solenoid check valve V is provided between a back pressure side oil chamber of the discharge cylinder 19 and an oil reservoir T, and the back pressure side oil chamber of the discharge cylinder 19 is communicated with the oil reservoir T when the solenoid check valve V is released, and the back pressure side oil chamber of the discharge cylinder 19 is shielded from the oil reservoir T when the solenoid check valve V is closed. After a pressure acting on the garbage loading device A comes to be a specified threshold value Th1 or higher at the time of garbage loading operation, while a state of the threshold value Th1 or higher is kept, an on/off action is performed in which releasing operation and closing operation of the solenoid check valve V are alternately performed.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a garbage truck.

  As a dust collection vehicle, a dust collection vehicle including a dust loading device that can be loaded into a dust storage box while compressing dust using a compression plate is known (for example, see Patent Document 1). Such a garbage truck is provided with a discharge plate slidable through a discharge cylinder in the dust container. When the dust is loaded into the dust storage box, the discharge plate is held against the compressive force of the dust loaded while maintaining the back pressure side oil chamber of the discharge cylinder at a high pressure. On the other hand, when the pressure acting on the dust loading device as the dust is loaded becomes equal to or higher than a predetermined threshold value, the back pressure side oil chamber of the discharge cylinder is communicated with the oil reservoir and compressed in the dust containing box. The discharge cylinder is contracted by the reaction force of the dust. Due to the contraction of the discharge cylinder, the discharge plate is moved forward from the rear of the dust storage box to expand the dust storage space, so that the dust is compressed while being compressed by the compression plate.

  The communication / blocking between the back pressure side oil chamber of the discharge cylinder and the oil reservoir as described above is performed by a solenoid check valve provided between the back pressure side oil chamber of the discharge cylinder and the oil reservoir. When the solenoid check valve is open (when switching to the communication position), the back pressure side oil chamber of the discharge cylinder is connected to the oil reservoir, while when the solenoid check valve is closed (when switching to the shut-off position), the back of the discharge cylinder The pressure side oil chamber is cut off from the oil reservoir.

JP 2009-234738 A

  By the way, in the conventional garbage collection vehicle as described above, when loading garbage (resource waste) such as cardboard and plastic bottles into the garbage storage box, it is desirable to increase the compression rate of the dust and carry it efficiently. Therefore, there were the following problems. That is, if the time for allowing the back pressure side oil chamber of the discharge cylinder to communicate with the oil reservoir is too short, the moving distance of the discharge plate to the front becomes short, so that the dust can be sufficiently compressed by the compression plate. However, since the dust storage space of the dust storage box cannot be sufficiently secured, it may take time to load the dust into the dust storage box.

  On the other hand, if the time for communicating the back pressure side oil chamber of the discharge cylinder with the oil reservoir is too long, the movement distance of the discharge plate to the front becomes long, so the compression of the dust by the compression plate becomes insufficient, and the dust storage box There is a possibility that it will not be possible to efficiently load the dust.

  The present invention has been made in consideration of the above-described circumstances. For example, dust that can be compressed at a relatively high compression rate, such as cardboard or plastic bottles, is loaded into the dust container while being efficiently compressed. An object is to provide a garbage truck that can be used.

  In the present invention, means for solving the above-described problems are configured as follows. That is, the present invention includes a dust bin that is mounted on a chassis and has a rear opening at the rear, a dust bin that is tiltably connected to a rear opening of the dust bin, and the dust bin. A dust loading device that can be loaded into the dust storage box while compressing the dust using a compression plate that rotates around one end, and is movable in the longitudinal direction of the vehicle body in the dust storage box A discharge plate that divides the internal space of the dust storage box into a dust storage space in which dust is loaded by the dust loading device and a front space in front of the vehicle body; and provided in the front space, the discharge plate A waste collection vehicle equipped with a discharge cylinder capable of changing the volume of the dust storage space by moving the vehicle in the longitudinal direction of the vehicle body, between a back pressure side oil chamber of the discharge cylinder and an oil reservoir The Solenoy When the solenoid check valve is opened, the back pressure side oil chamber of the discharge cylinder is communicated with the oil reservoir, and when the solenoid check valve is closed, the back pressure side oil chamber of the discharge cylinder is provided. Is blocked from the oil reservoir, and after the pressure acting on the dust loading device during the dust loading operation by the dust loading device becomes equal to or higher than a predetermined threshold, the state equal to or higher than the threshold is maintained. Meanwhile, an on / off operation is alternately performed in which the solenoid check valve is alternately opened and closed. When the pressure acting on the dust loading device becomes equal to or higher than the threshold value and becomes lower than the threshold value, the solenoid check valve is turned off and the solenoid check valve is closed. However, after that, when the pressure acting on the dust loading device becomes equal to or higher than the threshold value again, the solenoid check valve is turned on and off.

  According to the garbage collection vehicle having the above configuration, dust that can be compressed at a relatively high compression rate, such as cardboard or plastic bottles, can be loaded into the dust container while being efficiently compressed. Specifically, after the pressure acting on the dust loading device during the dust loading operation by the dust loading device becomes equal to or higher than a predetermined threshold value, while the state exceeding the threshold value is maintained, the solenoid check valve An on / off operation in which an opening operation and a closing operation are alternately performed is performed. According to such an on / off operation of the solenoid check valve, the solenoid check valve is opened for a predetermined time, and accordingly, the forward movement of the discharge plate is allowed. Thereby, the dust storage space of the dust storage box can be secured, and the dust can be smoothly loaded into the dust storage box. In addition, since the solenoid check valve is closed for a predetermined time after the predetermined time has elapsed, the forward movement of the discharge plate is restricted in the closed state of the solenoid check valve. By the discharge plate, the dust loaded in the dust storage space of the dust storage box can be efficiently compressed. Therefore, when the solenoid check valve is turned on and off, when the dust that can be compressed at a relatively high compression rate is loaded, the dust can be loaded while being efficiently compressed in the dust container box.

  In the garbage collection vehicle having the above-described configuration, the solenoid check valve is maintained in a closed state until a predetermined time elapses after a pressure acting on the dust loading device exceeds a predetermined threshold, and the predetermined time After the elapse of time, it is preferable that the solenoid check valve is opened. As a result, since the forward movement of the discharge plate is restricted immediately after the pressure acting on the dust loading device becomes equal to or higher than a predetermined threshold value, the dust by the dust loading device during the predetermined time. The compression force to the dust can be further increased, and the dust loaded in the dust storage space of the dust storage box can be efficiently compressed.

  In the refuse collection vehicle having the above-described configuration, the pressure acting on the dust loading device is not detected until a predetermined time has elapsed after the dust loading step (the ascending step) is started by the dust loading device. Is preferred.

  Here, immediately after the loading process (rising process) of the dust loading device is started, the pressure acting on the dust loading device rapidly increases due to the surge pressure at the time of switching the main valve. there is a possibility. Therefore, in order to avoid the influence of such surge pressure, the solenoid check is not performed until the predetermined time has elapsed after the start of the raising process of the dust loading device, and the pressure acting on the dust loading device is not detected. By not performing the on / off operation of the valve, the malfunction caused by the surge pressure is suppressed.

  In the refuse collection vehicle having the above-described configuration, it is preferable that a changeover switch for switching between a state in which the on / off operation of the solenoid check valve is allowed and a state in which the solenoid check valve is not allowed be provided at a rear portion of the dust input box.

  In this case, for example, when loading dust that can be compressed at a relatively high compression rate, such as cardboard or plastic bottles, into the dust container, it is easy to operate by operating the selector switch provided at the rear of the dust container. The solenoid check valve can be switched to a state in which the on / off operation is permitted. Similarly, when loading dust other than the above (not compressing at a high compression rate) into the dust storage box, the solenoid check valve can easily be turned on and off by operating the changeover switch. Can be switched.

  In the garbage collection vehicle having the above configuration, the hydraulic circuit of the dust loading device is provided with a hydraulic cylinder for rotating the compression plate, and detects a pressure acting on the dust loading device. However, it is preferable to be provided in an oil passage connected to the back pressure side oil chamber of the hydraulic cylinder.

  Or it is preferable that the pressure sensor which detects the pressure which acts on the said dust loading device is provided in the main oil path connected to the hydraulic pump provided in the hydraulic circuit of the said dust loading device. In this way, by providing the pressure sensor in the main oil passage of the hydraulic circuit of the dust loading device, the pressure acting on the dust loading device can be detected more stably during the dust loading operation by the dust loading device. It is possible to reliably detect the occurrence of a sudden pressure increase in each step of the dust loading device.

  In the garbage collection vehicle having the above-described configuration, when compressing the dust thrown into the dust throwing box (compression process), the pressure acting on the dust loading device while rotating the compression plate is It is preferable that an inching operation for raising the compression plate is performed while the second threshold value is smaller than the second threshold value.

  According to the garbage collection vehicle having the above-described configuration, for example, by performing an inching operation in a compression process for dust that does not easily deform, such as furniture and electrical appliances, the dust is compressed in the dust container box. It becomes possible to load in.

  According to the refuse collection vehicle of the present invention, dust that can be compressed at a relatively high compression rate, such as cardboard and plastic bottles, can be loaded into the dust container while being efficiently compressed.

It is side surface sectional drawing which shows schematic structure of the garbage truck which concerns on embodiment of this invention. FIG. 2 is a hydraulic circuit diagram of the refuse collection vehicle of FIG. 1. It is the schematic which shows the control apparatus of the garbage truck of FIG. 1, and the electric circuit of the periphery. It is explanatory drawing which shows the attachment position of the non-contact switch and operation switch of the refuse collection vehicle of FIG. 3 is a timing chart illustrating an example of an on / off operation of the solenoid check valve of FIG. 2. It is a figure which shows the modification of the hydraulic circuit of a refuse collection vehicle. It is side surface sectional drawing which shows the outline of the inching operation performed at the compression process of a dust loading device. It is a timing chart which shows an example of the inching operation | movement of FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, in the front-rear direction, the side on which dust is thrown in is the rear and the opposite side is the front.

  FIG. 1 is a side sectional view showing a schematic configuration of a garbage truck 100 according to an embodiment of the present invention. As shown in FIG. 1, in the garbage truck 100, the work device 1 is provided on a chassis 50. The working device 1 includes a dust storage box 2, a dust input box 3 and the like disposed in an opening 4 at the rear of the dust storage box 2 so as to be tiltable about a pivot 5.

  The front surface of the dust box 3 is partially opened and communicated with the opening 4 at the rear of the dust container 2, the input port 6 is opened below the back surface, and the dust storage chamber 7 is formed at the lower part. Is formed. A dust loading device A for crushing and compressing the dust thrown into the storage chamber 7 through the inlet 6 and loading the dust into the dust storage box 2 is provided in the dust throwing box 3. Hereinafter, the refuse loading apparatus A will be described.

  On both side walls of the dust box 3 of the dust loading device A, guide groove members 8 made of channel steel are laid so as to incline from the front upper end toward the rear lower part. Also, in the dust throwing-in box 3, an elevating plate 9 extending in the width direction is accommodated, and guide rollers 10 are axially mounted on both upper and lower edges of the elevating plate 9, and these guide rollers 10 are guided groove members. 8 is fitted along the inner wall of 8. On the other hand, a pivot 11 is provided on the rear upper part of the lifting plate 9 via a bracket, and this pivot 11 is provided on the side wall of the dust box 3 so as to match the sliding distance of the lifting plate 9. 8 protrudes outward from the inside of the dust box 3 beyond the notch 12 formed along the back surface. As shown in FIG. 4, the elevating cylinder 13 is displaced along the inclination direction of the guide groove member 8 and above the back surface between the pivot 11 and the lower outer side of the dust box 3. Is provided. Thereby, the elevating plate 9 can be reciprocated up and down along the guide groove member 8 by the expansion and contraction operation of the elevating cylinder 13.

  In addition, a compression plate (pushing plate) 14 extending in the horizontal direction of the dust box 3 is pivotally supported at the lower end of the elevating plate 9 so as to be swingable back and forth. A pushing cylinder 17 is provided between the projecting piece 16 projecting from the back surface of the compression plate 14 and the pivot 11 provided at the upper back surface of the lifting plate 9. Thereby, the compression plate 14 can be swung back and forth around the shaft support portion 15 by the expansion and contraction operation of the push cylinder 17.

  On the other hand, a discharge plate 18 that is movable back and forth in the front-rear direction is disposed inside the dust container box 2. The discharge plate 18 has a width that is substantially equal to the inner width of the dust container 2 and a height that is substantially equal to the height from the bottom wall to the top wall of the dust container 2. The discharge plate 18 divides the internal space of the dust storage box 2 into a dust storage space in which dust is loaded and a front space in front of the vehicle body. A discharge cylinder 19 is disposed in a front space in front of the vehicle body. The discharge cylinder 19 is connected to a bracket 25 fixed to the front portion of the dust container 2, and the discharge cylinder 19 and the lower portion of the discharge plate 18 are connected. As a result, the discharge plate 18 can be reciprocated back and forth within the refuse storage box 2 by the expansion and contraction operation of the discharge cylinder 19.

  The discharge cylinder 19 is a three-stage cylinder in which three cylinders having different diameters are incorporated. The large-diameter cylinder side is connected to the lower portion of the discharge plate 18 and the small-diameter cylinder side is connected to the bracket 25.

  Further, a lashing cylinder 21 pivotally supported at one end is disposed at the bottom rear portion of the dust container 2, and the other end is connected to a lash claw 22 pivotally supported at the lower part of the dust container 2. ing. The lashing claw 22 is engaged with a U-bolt 23 fixed on the front surface of the dust container 3 so that the dust container 3 is secured to the dust container 2. .

  Next, the hydraulic circuit of the garbage truck 100 will be described with reference to FIG.

  As shown in FIG. 2, the hydraulic circuit of the garbage truck 100 includes a hydraulic pump P, an oil reservoir T, an electromagnetic control valve V1 that controls expansion and contraction of the lifting cylinder 13, an electromagnetic control valve V2 that controls expansion and contraction of the push cylinder 17, and a discharge cylinder. 19 includes an electromagnetic control valve V3 that controls the expansion and contraction of 19 and an electromagnetic control valve V4 that controls the expansion and contraction of the tying cylinder 21 and the tilting cylinder 24 that tilts the dust box 3. The driving force of a vehicle engine (not shown) is transmitted to the hydraulic pump P via a PTO (Power Take Off).

  The electromagnetic control valves V1 to V4 are 6-port 3-position electromagnetic direction switching valves. The electromagnetic control valve V1 has solenoids SOLa and SOLb, the electromagnetic control valve V2 has solenoids SOLc and SOLd, the electromagnetic control valve V3 has solenoids SOLe and SOLf, and the electromagnetic control valve V4 has solenoids SOLh and SOLi. doing. The electromagnetic control valves V1 to V4 are switched to the upper position or the lower position only when each solenoid is energized, and return to the neutral position when not energized.

  Further, a hydraulic pressure sensor PS for detecting the hydraulic pressure is connected to the oil passage connected (communicated) to the back pressure side oil chamber of the pushing cylinder 17. Further, a solenoid check valve V and a relief valve R are connected to the oil passage connected to the back pressure side oil chamber of the discharge cylinder 19. The solenoid check valve V has a solenoid SOLg, and is normally biased to a position (blocking position) that prevents the back pressure side oil chamber of the discharge cylinder 19 from communicating with the oil reservoir T. When the solenoid SOLg is energized, The back pressure side oil chamber of the discharge cylinder 19 is switched to a position (communication position) communicating with the oil reservoir T. That is, when the solenoid check valve V is opened (when switching to the communication position), the back pressure side oil chamber of the discharge cylinder 19 is communicated with the oil reservoir T, while when the solenoid check valve V is closed (to the shut-off position). At the time of switching), the back pressure side oil chamber of the discharge cylinder 19 is cut off from the oil reservoir T. The relief valve R is configured to return the pressure oil to the oil reservoir T when the hydraulic pressure in the back pressure side oil chamber of the discharge cylinder 19 reaches a set value or more.

  Next, an input / output state for a control device PLC (Programmable Logic Controller) for controlling the dust loading device A, the discharge plate 18 and the like will be described with reference to FIGS.

  As shown in FIG. 4, in the driver's seat of the refuse collection vehicle 100, a selection switch SW1 for selecting a dust loading operation and a dust discharge operation, an open / close switch SW2 for the dust box 3, a reverse switch SW3 for the discharge plate 18, etc. Is provided. At the rear of the dust input box 3, a start switch SW4 of the dust loading device A, a stop switch SW5 of the dust loading device A, a forward switch SW6 of the discharge plate 18, and a general mode of the dust loading device A (first compression state) ) And a resource mode (second compression state), a mode change-over switch SW7 and the like are provided. The installation positions of the various switches SW1 to SW7 are merely examples, and the various switches SW1 to SW7 may be installed at positions other than those described above.

  In addition, as shown in FIGS. 3 and 4, a contactless switch LS <b> 1 that detects a state in which the lifting cylinder 13 that lifts and lowers the lifting plate 9 is fully extended is in the dust container 3, and the lifting cylinder 13 is in the most contracted state. Are provided, a non-contact switch LS4 for detecting the most extended state of the pushing cylinder 17 that swings the compression plate 14, a non-contact switch LS3 for detecting the most contracted state of the pushing cylinder 17, and the like. ing. The non-contact switches LS1 and LS2 are switched between a garbage throwing box 3 and an elevating cylinder 13 with a detection body on one side and a detection body on the other side. Further, the contactless switches LS3 and LS4 are switched between a lifting plate 9 and a pushing cylinder 17 with a detection body on one side and a detection body on the other side. As these non-contact switches LS1 to LS4, for example, photoelectric switches, proximity switches and the like can be used.

  As shown in FIG. 3, the various switches SW1 to SW7, the contactless switches LS1 to LS4, the solenoids SOLa to SOLi, and the hydraulic pressure sensor PS are connected to the control device PLC. The control device PLC includes a signal power supply unit (not shown), a central processing unit, a relay coil, and the like. The control device PLC is programmed to output to the corresponding solenoids SOLa to SOLi according to a procedure set in advance based on the input states of the various switches SW1 to SW7, the contactless switches LS1 to LS4, and the hydraulic pressure sensor PS. .

  Next, the operation of the garbage truck 100 (the dust loading device A) configured as described above will be described. First, here, a case will be described in which the mode changeover switch SW7 is not pressed by an operator and the garbage collection vehicle 100 (the dust loading device A) operates in the general mode.

  The dust loading device A is normally stopped at the end state of the ascending process (loading process) shown in FIG. In this state, the elevating plate 9 is disposed at the ascent limit position, and the compression plate 14 is disposed at the forward swing limit position.

  The worker arrives at the work site and stops the garbage truck 100, and then turns on a PTO switch (not shown). Then, the PTO enters a connected state, and driving of the hydraulic pump P is started. At this time, the electromagnetic control valves V1 to V4 are in a neutral position, and the hydraulic oil discharged from the hydraulic pump P is returned to the oil reservoir T without driving the cylinders 13, 17, 19, and 21.

  In this state, since the elevating cylinder 13 and the push-in cylinder 17 are both in the fully extended state, the contactless switches LS1 and LS4 are operated, and ON signals of the contactless switches LS1 and LS4 are input to the control device PLC. ing. In this state, when the operator selects the dust loading operation with the selection switch SW1 and puts the dust into the storage chamber 7 from the inlet 6 of the dust box 3, the solenoid SOLd is energized when the start switch SW4 is pressed. The electromagnetic control valve V2 is switched to the upper position. As a result, the pushing cylinder 17 contracts, and the compression plate 14 is reversed until the compression surface thereof is in a substantially horizontal position as shown in FIG. 1 (b).

  When the compression plate 14 reaches the rearward swing limit position, that is, when the pushing cylinder 17 contracts to the maximum, the contactless switch LS3 is activated, and the control device PLC releases the energization to the solenoid SOLd and opens the electromagnetic control valve V2. Simultaneously with returning to the neutral position, the solenoid SOLb is energized, and the electromagnetic control valve V1 is switched to the upper position. As a result, the elevating cylinder 13 is contracted and the elevating plate 9 is lowered along the guide groove member 8. As a result, as shown in FIG. 1 chain lines (b) to (c), the compression plate 14 connected to the elevating plate 9 descends in parallel while holding its compression surface to be substantially horizontal (down) Step), the dust can be crushed between the bottom surface of the dust box 3 and the circular arc surface.

  When the elevating plate 9 reaches the lower limit position, that is, when the elevating cylinder 13 contracts to the maximum, the contactless switch LS2 is activated, and the control device PLC releases the energization to the solenoid SOLb and moves the electromagnetic control valve V1 to the neutral position. At the same time, the solenoid SOLc is energized to switch the electromagnetic control valve V2 to the lower position. As a result, the pushing cylinder 17 extends from the end state of the descending step shown in the chain line (c) of FIG. 1, and the compression surface of the compression plate 14 is supported by the shaft support 15 as shown in the chain line (d) of FIG. It is swung (rotated) clockwise until it becomes substantially vertical (compression process). As a result, the compression plate 14 can secondarily compress the dust primarily crushed in the descending step with the flat surface of the bottom surface of the dust box 3.

  When the compression plate 14 reaches the forward swing limit position, that is, when the pushing cylinder 17 is extended to the maximum, the non-contact switch LS4 is activated, and the control device PLC releases the energization to the solenoid SOLc and opens the electromagnetic control valve V2. Simultaneously with returning to the neutral position, the solenoid SOLa is energized to switch the electromagnetic control valve V1 to the lower position. As a result, the elevating cylinder 13 extends from the end state of the compression step shown in FIG. 1 (d), and the compression plate 14 is raised in parallel with the compression surface thereof being substantially vertical (ascending step). The dust compressed in the compression process is loaded into the dust container 2. When the elevating plate 9 reaches the ascent limit position, that is, when the elevating cylinder 13 is extended to the maximum, the contactless switch LS1 is activated, and the control device PLC releases the energization of the solenoid SOLa and turns on the electromagnetic control valve V1. Return to the neutral position. Thereby, an ascending process (loading process) is completed.

  As described above, the dust loading device A operates in the order of the reversing process, the descending process, the compressing process, and the ascending process by the pressing operation of the start switch SW4, and the dust thrown into the dust throwing box 3 is disposed in the dust containing box. 2 can be loaded. In the reversing step, the compression plate 14 moves from the position (a) shown in FIG. 1 to the position (b). In the lowering step, the compression plate 14 moves from the position (b) shown in FIG. 1 to the position (c). Move up. In the compression process, the compression plate 14 moves from the position (c) shown in FIG. 1 to the position (d). In the ascending process, the compression plate 14 moves from the position (d) shown in FIG. 1 to the position (a). Move up. Such a cycle of the inversion process, the descending process, the compressing process, and the ascending process is repeatedly performed during operation of the dust loading device A. In addition, the movement locus | trajectory of the front-end | tip 14a of the compression board 14 is shown with the dashed-dotted line in FIG.

  Here, in the ascending process, normally, the electromagnetic control valve V3 that controls the expansion and contraction of the discharge cylinder 19 is in the neutral position, and the solenoid check valve V is in the cutoff position with the discharge cylinder 19 extended, and the piston rod side The oil chamber and the piston back pressure side oil chamber are port-blocked. Accordingly, when the dust is loaded into the dust container 2, the discharge cylinder 19 is held in an extended state, so that the dust is compressed between the compression plate 14 and the discharge plate 18.

  By sequentially loading the dust into the dust container 2 by the dust loading device A, the reaction force of the dust acting on the compression plate 14 also increases. In this case, the hydraulic pressure in the back pressure side oil chamber of the pushing cylinder 17 that supports the compression plate 14 gradually increases. When the oil pressure value detected by the oil pressure sensor PS, that is, the oil pressure value in the back pressure side oil chamber of the push-in cylinder 17 becomes equal to or greater than a predetermined threshold Th1, the control device PLC energizes the solenoid SOLg, and the solenoid check valve V Is released. While the solenoid check valve V is opened, the pressure oil is recirculated from the back pressure side oil chamber of the discharge cylinder 19 to the oil reservoir T. At this time, the discharge cylinder 19 contracts due to the reaction force of the compressed dust, and the discharge plate 18 moves forward. As a result, since a new dust storage space is formed in the dust storage box 2, dust can be loaded into the new dust storage space while being compressed. When the hydraulic pressure value of the back pressure side oil chamber of the pushing cylinder 17 detected by the hydraulic pressure sensor PS decreases with the contraction operation of the discharge cylinder 19, and the hydraulic pressure value becomes less than the predetermined threshold value Th1, the control device The PLC turns off the energization to the solenoid SOLg and closes the solenoid check valve V. Thereby, the recirculation of the pressure oil to the oil reservoir T is prevented, and the forward movement of the discharge plate 18 is restricted.

  Note that, in the reversing process, the descending process, and the compressing process other than the ascending process, even if the hydraulic pressure value in the back pressure side oil chamber of the pushing cylinder 17 detected by the hydraulic sensor PS becomes equal to or higher than a predetermined threshold Th1. The controller PLC does not energize the solenoid SOLg, and the solenoid check valve V is not opened.

  Next, a case where the mode selector switch SW7 provided at the rear part of the dust box 3 is pressed by the operator and the garbage truck 100 (the dust loading device A) operates in the resource mode will be described. . This resource mode is selected, for example, when loading dust that can be compressed at a relatively high compression rate, such as cardboard or plastic bottles, into the dust loading device A. On the other hand, the above-described general mode is selected when dust other than the above (no compression at a high compression rate is performed) is loaded on the dust loading device A.

  In the resource mode, the dust loading device A operates in the order of the reversing process, the descending process, the compressing process, and the ascending process by the pressing operation of the start switch SW4 in the resource mode.

  The resource mode inversion process, descent process, and compression process are the same processes as the general mode inversion process, descent process, and compression process described above, and the inversion process, descent process, and compression process described above. The dust loading device A is operated in the same manner as the general mode reversal step, the descent step, and the compression step. In the reversing step, the compression plate 14 moves from the position (a) shown in FIG. 1 to the position (b). In the descending step, the compression plate 14 moves from the position (b) shown in FIG. 1 to the position (c). In the compression step, the compression plate 14 moves from the position (c) shown in FIG. 1 to the position (d). Further, in the reversing process, the descending process, and the compressing process, even when the hydraulic pressure value of the back pressure side oil chamber of the pushing cylinder 17 detected by the hydraulic pressure sensor PS is equal to or higher than the predetermined threshold Th1, the control device PLC Does not energize the solenoid SOLg, and the solenoid check valve V is not opened.

  In the resource mode, the operation of the solenoid check valve V in the ascending process is different from the general mode described above. That is, in the resource mode, the point that the compression plate 14 moves from the position (d) to the position (a) shown in FIG. 1 is the same as the general mode described above, but is detected by the hydraulic sensor PS. The operation of the solenoid check valve V when the hydraulic pressure value in the back pressure side oil chamber of the pushing cylinder 17 is equal to or greater than a predetermined threshold Th1 is different from the normal compression mode described above. This point will be specifically described.

  As described above, in the general mode, the pressure (hydraulic pressure of the hydraulic circuit) acting on the dust loading device A during the dust loading operation by the dust loading device A, in other words, the pushing cylinder 17 detected by the hydraulic sensor PS. When the hydraulic pressure value of the back pressure side oil chamber becomes equal to or greater than a predetermined threshold value Th1, the solenoid check valve V is switched to the communication position, the solenoid check valve V is opened, and the pushing cylinder detected by the hydraulic sensor PS The open state of the solenoid check valve V is maintained until the hydraulic pressure value of the back pressure side oil chamber 17 becomes less than a predetermined threshold value Th1. Thus, the back pressure side oil chamber of the discharge cylinder 19 and the oil reservoir T are communicated, and the pressure oil is recirculated from the back pressure side oil chamber of the discharge cylinder 19 to the oil reservoir T. In the ascending process of the general mode, as described above, when the hydraulic pressure value in the back pressure side oil chamber of the push-in cylinder 17 is equal to or greater than the predetermined threshold Th1, the dust is not compressed, so that the dust can be loaded quickly. It has become.

  On the other hand, in the resource mode, the pressure acting on the dust loading device A during the dust loading operation by the dust loading device A, in other words, the hydraulic pressure of the back pressure side oil chamber of the pushing cylinder 17 detected by the hydraulic sensor PS. After the value becomes equal to or greater than the predetermined threshold Th1, an on / off operation is performed in which the solenoid check valve V is alternately opened and closed while the state equal to or greater than the threshold Th1 is maintained. The solenoid check valve V may be opened first and then closed, or the solenoid check valve V may be closed first and then opened. Also good.

  In this case, the solenoid check valve V is turned on / off by switching the on / off state of energization to the solenoid SOLg. When the energization of the solenoid SOLg is on, the solenoid check valve V is switched to the open state, the back pressure side oil chamber of the discharge cylinder 19 and the oil reservoir T are communicated, and the pressure oil is discharged from the back pressure side oil chamber of the discharge cylinder 19. The oil is recirculated to the oil reservoir T. Then, the discharge cylinder 19 contracts due to the reaction force of the dust that is compressed, moves forward of the discharge plate 18, and the dust storage space of the dust storage box 2 is expanded.

  On the other hand, when the energization of the solenoid SOLg is turned off, the solenoid check valve V is switched to the closed state, the back pressure side oil chamber of the discharge cylinder 19 and the oil reservoir T are shut off, and the oil is discharged from the back pressure side oil chamber of the discharge cylinder 19. The return of pressurized oil to the reservoir T is prevented. Thereby, the contraction of the discharge cylinder 19 is stopped, the forward movement of the discharge plate 18 is stopped, the volume of the dust storage space of the dust storage box 2 is maintained, and the dust compression performance is ensured.

  In the present embodiment, the on / off operation of the solenoid check valve V as described above is performed according to a timing chart as shown in FIG. 5B, for example. FIG. 5B shows an example of on / off operation of the solenoid check valve V immediately after the hydraulic pressure value in the back pressure side oil chamber of the pushing cylinder 17 detected by the hydraulic pressure sensor PS becomes equal to or higher than a predetermined threshold Th1. ing. In the example of FIG. 5B, first, after the hydraulic pressure value of the back pressure side oil chamber of the pushing cylinder 17 detected by the hydraulic pressure sensor PS becomes equal to or higher than a predetermined threshold value Th1, a predetermined time (here, approximately 0. 0). The solenoid check valve V is kept closed until 5 seconds), and after the predetermined time has elapsed, the solenoid check valve V is opened. The opening operation of the solenoid check valve V continues for approximately 1.0 seconds. Thereafter, the closing operation of the solenoid check valve V continues for approximately 2.0 seconds. Furthermore, the opening operation of the solenoid check valve V continues for approximately 1.0 seconds, and the closing operation of the solenoid check valve V continues for approximately 1.0 seconds. Thus, while the state in which the hydraulic pressure value of the back pressure side oil chamber of the push-in cylinder 17 detected by the hydraulic pressure sensor PS is equal to or higher than the predetermined threshold value Th1 is maintained, the solenoid check valve V is opened and closed. The operation is performed alternately.

  Here, when the hydraulic pressure value of the back pressure side oil chamber of the pushing cylinder 17 detected by the hydraulic pressure sensor PS becomes less than the predetermined threshold value Th1, the solenoid check valve V as described above is in the middle of the ON / OFF operation. Even so, energization to the solenoid SOLg is turned off, and the solenoid check valve V is closed. That is, when the hydraulic pressure value of the back pressure side oil chamber of the pushing cylinder 17 detected by the hydraulic pressure sensor PS becomes less than the predetermined threshold value Th1, the solenoid check valve V is turned on / off according to the timing chart of FIG. The solenoid check valve V is closed by resetting (stopping). Thereafter, when the hydraulic pressure value in the back pressure side oil chamber of the pushing cylinder 17 detected by the hydraulic pressure sensor PS becomes equal to or higher than the predetermined threshold Th1 in the ascending process of the dust loading device A, the timing chart of FIG. Accordingly, the on / off operation of the solenoid check valve V as described above is performed.

  By performing on / off operation of the solenoid check valve V, dust that can be compressed at a relatively high compression rate, such as cardboard or plastic bottle, can be loaded into the dust container 2 while being efficiently compressed. . This point will be described below.

  Here, conventionally, on / off operation of the solenoid check valve V has been performed, for example, at the timing shown in FIG. In the example of FIG. 5A, the energization of the solenoid SOLg is turned on, in other words, the solenoid check valve V is continuously opened for a predetermined time (approximately 1.0 second), and thereafter the solenoid check is performed. The opening operation of the valve V is not performed. In this case, since the forward movement of the discharge plate 18 is not allowed after a predetermined time has elapsed, the dust storage space of the dust storage box 2 cannot be sufficiently secured, and the dust can be smoothly loaded into the dust storage box 2. There is concern that it will not be possible.

  On the other hand, in this embodiment, as shown in FIG. 5B, after the hydraulic pressure value of the back pressure side oil chamber of the pushing cylinder 17 detected by the hydraulic pressure sensor PS becomes equal to or higher than a predetermined threshold value Th1, While the state equal to or greater than the threshold value Th1 is maintained, an on / off operation is performed in which the solenoid check valve V is alternately opened and closed. According to such an on / off operation of the solenoid check valve V, the solenoid check valve V is opened for a predetermined time, and accordingly, the forward movement of the discharge plate 18 is allowed. Thereby, the dust storage space of the dust storage box 2 can be secured, and the dust can be smoothly loaded into the dust storage box 2. In addition, since the solenoid check valve V is closed for a predetermined time after the predetermined time has elapsed, in the closed state of the solenoid check valve V, the forward movement of the discharge plate 18 is restricted. By the compression plate 14 and the discharge plate 18, the dust loaded in the dust storage space of the dust storage box 2 can be efficiently compressed. Therefore, according to the present embodiment, when the solenoid check valve V is turned on and off, when the dust that can be compressed at a relatively high compression rate is loaded, the dust is loaded into the dust container 2 while being efficiently compressed. It can be performed.

  In the present embodiment, a predetermined time (for example, 0.5 seconds) elapses after the hydraulic pressure value in the back pressure side oil chamber of the push-in cylinder 17 detected by the hydraulic pressure sensor PS becomes equal to or higher than the predetermined threshold Th1. Up to this point, the solenoid check valve V is kept closed, and the solenoid check valve V is opened after a predetermined time has elapsed. As a result, the forward movement of the discharge plate 18 is restricted immediately after the hydraulic pressure value of the back pressure side oil chamber of the pushing cylinder 17 detected by the hydraulic pressure sensor PS becomes equal to or higher than the predetermined threshold Th1. During the predetermined time, the compression force to the dust by the pushing cylinder 17 can be further increased, and the dust loaded in the dust storage space of the dust storage box 2 can be efficiently compressed.

  Further, in the present embodiment, the pushing cylinder 17 is pushed by the hydraulic sensor PS until a predetermined time (for example, 0.5 seconds) elapses after the dust loading process (ascending process) is started by the dust loading device A. The oil pressure value of the back pressure side oil chamber is not detected. That is, immediately after the raising process of the dust loading device A is started, the hydraulic pressure value of the back pressure side oil chamber of the pushing cylinder 17 detected by the hydraulic sensor PS due to the surge pressure at the time of switching the main valve is There is a possibility that it will increase rapidly. Therefore, in order to avoid the influence of such surge pressure, the hydraulic pressure value of the back pressure side oil chamber of the pushing cylinder 17 is detected until a predetermined time elapses after the start of the raising process of the dust loading device A. First, the malfunction due to surge pressure is suppressed by not performing the on / off operation of the solenoid check valve V described above. In addition, as said predetermined time, it is preferable to set to 0.5 to 1.0 second, for example.

  In the present embodiment, a mode changeover switch SW7 for switching between a state where the on / off operation of the solenoid check valve V is allowed (resource mode) and a state where the solenoid check valve V is not allowed (general mode) is provided at the rear portion of the dust input box 3. Is provided. As a result, when a dust that can be compressed at a relatively high compression rate, such as cardboard or a plastic bottle, is loaded into the dust storage box 2, the mode selector switch SW7 provided at the rear of the dust box 3 is operated. Thus, it is possible to easily switch to a state (resource mode) in which the on / off operation of the solenoid check valve V is allowed. Similarly, when dust other than the above (not compressed at a high compression rate) is loaded in the dust storage box 2, the solenoid check valve V can be easily turned on and off by operating the mode switch SW7. It is possible to switch to an unacceptable state (general mode).

  Embodiment disclosed this time is an illustration in all the points, Comprising: It does not become the basis of limited interpretation. The technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the scope of claims. Further, the technical scope of the present invention includes all modifications within the meaning and scope equivalent to the scope of the claims.

  The timing chart shown in FIG. 5B is an example, and the solenoid check valve V may be turned on / off at a timing other than the above. For example, the solenoid check valve V may be turned on / off according to a timing chart as shown in FIG. In the example of FIG. 5 (c), the duration of the ON state of energization to the solenoid SOLg, in other words, the duration of the solenoid check valve V in the open state is made different between the first case and the second and subsequent cases. ing. Specifically, first, after the hydraulic pressure value of the back pressure side oil chamber of the pushing cylinder 17 detected by the hydraulic pressure sensor PS becomes equal to or higher than a predetermined threshold value Th1, a predetermined time (here, approximately 0.5 seconds) is set. Until the time has elapsed, the solenoid check valve V is maintained in a closed state, and after the predetermined time has elapsed, the solenoid check valve V is opened. The opening operation of the solenoid check valve V continues for approximately 1.0 seconds. Thereafter, the closing operation of the solenoid check valve V continues for approximately 1.0 seconds. Furthermore, the opening operation of the solenoid check valve V continues for approximately 0.5 seconds, and the closing operation of the solenoid check valve V continues for approximately 1.0 seconds. Thereafter, the opening operation of the solenoid check valve V continues for approximately 0.5 seconds, and the closing operation of the solenoid check valve V continues for approximately 1.0 seconds. Thus, while the state in which the hydraulic pressure value of the back pressure side oil chamber of the push-in cylinder 17 detected by the hydraulic pressure sensor PS is equal to or higher than the predetermined threshold value Th1 is maintained, the solenoid check valve V is opened and closed. The operation is performed alternately. In this case, the duration of the open state of the solenoid check valve V is set to be shorter than the second time (0.5 seconds) and the first time (1.0 seconds). The valve V can be turned on and off.

  In the above embodiment, the oil pressure sensor PS is provided in the oil passage connected to the back pressure side oil chamber of the push-in cylinder 17 (see FIG. 2), but the oil pressure sensor PS may be provided in other locations. For example, as shown in FIG. 6, whether or not the hydraulic pressure value detected by the hydraulic pressure sensor PS is provided in a main oil passage directly connected to the hydraulic pump P and detected by the hydraulic pressure sensor PS is greater than or equal to a predetermined threshold value Th1. Based on the above, the above-described solenoid check valve V may be turned on / off. As shown in the example of FIG. 6, by providing the hydraulic sensor PS in the main oil passage of the hydraulic circuit of the dust loading device A, the dust loading device A acts on the dust loading device A during the dust loading operation. The pressure can be detected more stably, and the occurrence of a sudden pressure increase in each step of the dust loading device A can be reliably detected.

  Further, in the compression process of the dust loading device A, an inching operation as shown in FIGS. 7 and 8 may be performed. 7 and 8 show an outline of the inching operation performed in the compression process of the dust loading device A. FIG. In FIG. 7, the movement trajectory of the tip 14a of the compression plate 14 is shown by a solid arrow, and the compression process is performed until the compression plate 14 moves from the position shown in (c) to the position shown in (d). . FIG. 8A shows on / off of the compression operation (rotation operation) of the compression plate 14, FIG. 8B shows on / off of the pressure value detected by the hydraulic sensor PS, and FIG. The on / off state of the lifting operation of the lifting plate 9 is shown.

  As shown in FIGS. 7 and 8, the inching operation is performed while the compression plate 14 is rotated while the pressure acting on the dust loading device A is equal to or higher than a predetermined second threshold Th2. It is an operation to raise. The second threshold Th2 is set to a value smaller than the threshold Th1 for the on / off operation of the solenoid check valve V described above (Th2 <Th1).

  In the compression process of the dust loading device A, the rotation operation of the compression plate 14 is performed as in the above embodiment. Specifically, a rotation operation is performed in which the compression plate 14 is rotated clockwise until the compression surface becomes substantially vertical with the shaft support portion 15 as a fulcrum. In addition, the discharge pressure of the hydraulic pump P (for example, in the case of the hydraulic circuit of FIG. 6) detected by the hydraulic sensor PS during the rotation of the compression plate 14 is equal to or greater than a predetermined second threshold Th2. During this time, an inching operation for raising the compression plate 14 is performed. The raising operation of the compression plate 14 is performed by driving the raising / lowering plate 9 up by extending the raising / lowering cylinder 13.

  As shown to Fig.8 (a), in the compression process of the refuse loading apparatus A, the rotation operation of the compression board 14 is started at the time t1. The rotation operation of the compression plate 14 is continuously performed during the compression process of the dust loading device A. Then, as shown in FIG. 8B, when the discharge pressure of the hydraulic pump P detected by the hydraulic sensor PS becomes equal to or higher than a predetermined second threshold Th2 at time t2, as shown in FIG. 8C. Thus, the raising operation of the compression plate 14 (the raising operation by the elevating plate 9) is performed. The upward movement of the compression plate 14 is continuously performed while the discharge pressure of the hydraulic pump P detected by the hydraulic sensor PS is equal to or higher than the second threshold Th2. That is, the raising operation of the compression plate 14 is continued until the discharge pressure of the hydraulic pump P detected by the hydraulic sensor PS becomes less than the second threshold Th2. As shown in FIG. 8B, when the discharge pressure of the hydraulic pump P detected by the hydraulic sensor PS becomes less than a predetermined second threshold Th2 at time t3, as shown in FIG. 8C. The ascending operation of the compression plate 14 (the ascending operation by the elevating plate 9) is stopped.

  Next, as shown in FIG. 8B, when the discharge pressure of the hydraulic pump P detected by the hydraulic sensor PS again becomes equal to or higher than a predetermined second threshold Th2 at time t4, as shown in FIG. ), The ascending operation of the compression plate 14 is performed. Also in this case, the raising operation of the compression plate 14 is continuously performed while the discharge pressure of the hydraulic pump P detected by the hydraulic sensor PS is equal to or higher than the second threshold Th2. As shown in FIG. 8B, when the discharge pressure of the hydraulic pump P detected by the hydraulic sensor PS becomes less than a predetermined second threshold Th2 at time t5, as shown in FIG. 8C. The raising operation of the compression plate 14 is stopped.

  Then, when the rotation operation of the compression plate 14 shown in FIG. 8A and the raising operation of the compression plate 14 shown in FIG. The operation is as shown. In the compressing process of the dust loading device A, for example, the dust is compressed by performing the inching operation as described above on the dust that is not easily deformed (not broken) such as furniture and electrical appliances. It becomes possible to load in the refuse storage box 2. It should be noted that a changeover switch for switching between a state where the inching operation is allowed and a state where the inching operation is not allowed may be provided so that the operator can select whether or not to perform the inching operation. When the pressure value of the hydraulic pressure sensor PS is equal to or higher than the second threshold Th2 during the compression process of the device A, the inching operation may be always performed. Note that the second threshold value Th2 may be set to the same value as the above-described threshold value Th1 of the on / off operation of the solenoid check valve V (Th1 = Th2).

  INDUSTRIAL APPLICABILITY The present invention can be used for a garbage collection vehicle including a dust loading device that can be loaded into a dust container while compressing dust using a compression plate.

100 Dust Collection Vehicle A Dust Loading Device 2 Dust Storage Box 3 Dust Input Box 9 Lift Plate 13 Lift Cylinder 14 Compression Plate 17 Push Cylinder 18 Discharge Plate 19 Discharge Cylinder PS Hydraulic Sensor SOLg Solenoid SW7 Mode Change Switch T Oil Reservoir Th1 Threshold Th2 Second threshold V Solenoid check valve

Claims (8)

A garbage storage box mounted on the chassis and having a rear opening at the rear;
A dust throwing box connected to the rear opening of the dust containing box so as to be tiltable;
A dust loading device that is mounted inside the dust throwing box and can be loaded into the dust containing box while compressing the dust using a compression plate that rotates around one end.
A discharge plate that is movably disposed in the front-rear direction of the vehicle body in the dust storage box, and divides the internal space of the dust storage box into a dust storage space in which dust is loaded by the dust loading device and a front space in front of the vehicle body; ,
A waste collection vehicle provided with a discharge cylinder provided in the front space and capable of changing the volume of the dust storage space by moving the discharge plate in the longitudinal direction of the vehicle body;
A solenoid check valve is provided between the back pressure side oil chamber of the discharge cylinder and the oil reservoir. When the solenoid check valve is opened, the back pressure side oil chamber of the discharge cylinder communicates with the oil reservoir. On the other hand, when the solenoid check valve is closed, the back pressure side oil chamber of the discharge cylinder is shut off from the oil reservoir,
After the pressure applied to the dust loading device during the dust loading operation by the dust loading device becomes equal to or higher than a predetermined threshold, the solenoid check valve is opened while the state equal to or higher than the threshold is maintained. An garbage collection vehicle characterized in that an on / off operation is performed in which an operation and a closing operation are alternately performed. In the refuse collection vehicle according to claim 1,
When the pressure acting on the dust loading device becomes equal to or higher than the threshold value and then becomes lower than the threshold value, the solenoid check valve is turned off and the solenoid check valve is closed. Garbage truck characterized by. In the garbage truck according to claim 1 or 2,
The solenoid check valve is maintained in a closed state until a predetermined time elapses after the pressure acting on the dust loading device reaches or exceeds a predetermined threshold, and after the predetermined time elapses, the solenoid check valve A garbage collection vehicle characterized in that the opening operation is performed. In the refuse collection vehicle according to any one of claims 1 to 3,
A dust collection vehicle that does not detect pressure acting on the dust loading device until a predetermined time has elapsed after the start of the dust loading step by the dust loading device. In the refuse collection vehicle according to any one of claims 1 to 4,
A garbage collection vehicle, wherein a changeover switch for switching between a state in which the on / off operation of the solenoid check valve is allowed and a state in which the solenoid check valve is not allowed is provided at a rear portion of the dust box. In the refuse collection vehicle according to any one of claims 1 to 5,
The hydraulic circuit of the dust loading device is provided with a hydraulic cylinder for rotating the compression plate,
A garbage collection vehicle, wherein a pressure sensor for detecting a pressure acting on the dust loading device is provided in an oil passage connected to a back pressure side oil chamber of the hydraulic cylinder. In the refuse collection vehicle as described in any one of Claims 1-6,
A dust collection vehicle characterized in that a pressure sensor for detecting a pressure acting on the dust loading device is provided in a main oil passage connected to a hydraulic pump provided in a hydraulic circuit of the dust loading device. . In the garbage truck as described in any one of Claims 1-7,
When compressing the dust thrown into the dust throwing box, the pressure acting on the dust loading device while turning the compression plate is equal to or greater than a second threshold value smaller than the predetermined threshold value. During this time, an inching operation for raising the compression plate is performed.

Images