JP2017065866A - Garbage collection vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a garbage collection vehicle that can control an ejecting plate at an appropriate position where garbage can be held against compressive force acting on the garbage when the garbage is loaded into a garbage storage box using a garbage loading device.SOLUTION: A garbage collection vehicle 1 according to one embodiment comprises: a garbage storage box 2, mounted on a chassis, which has an opening part at a rear side; a garbage charging box 3 tiltably arranged at the opening part of the garbage storage box 2; a garbage loading device A, equipped inside the garbage charging box 3, which loads garbage into the garbage storage box 2; an ejecting plate 18 arranged inside the garbage storage box 2 by an ejecting cylinder 19 to be movable back and forth; a load sensor 20 that detects a load acting on in a longitudinal direction of the garbage storage box 2 of loads acting on the ejecting plate 18; a release valve, connected to a back-pressure side hydraulic circuit of the ejecting cylinder 19, through which the back-pressure side hydraulic pressure can be ejected; and position control means that controls a position of the ejecting plate 18.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a garbage truck equipped with a discharge plate.

  Conventionally, in a garbage truck, a discharge plate that can be moved back and forth via a discharge cylinder is provided in a dust storage box in which dust is stored, and when the dust is loaded into the dust storage box, the back pressure side oil chamber of the discharge cylinder is pressurized. While holding the discharge plate against the compressive force acting on the dust loaded while maintaining the pressure, if the hydraulic pressure acting on the dust loading device reaches the set value as the dust is loaded, the back pressure side of the discharge cylinder By connecting the oil chamber to the oil reservoir for a certain period of time, the discharge cylinder is contracted and the discharge plate is moved forward to expand the dust storage space. Thereby, in the conventional garbage collection vehicle, the discharge plate is moved forward stepwise and loaded while compressing the dust (for example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 2-117502

  In the garbage collection vehicle described above, when the hydraulic pressure acting on the dust loading device reaches a set value or more, the discharge plate moves forward by connecting the back pressure side oil chamber of the discharge cylinder to the oil reservoir for a certain period of time. However, in such a configuration, since the discharge plate moves in stages, it is difficult to strictly control the position of the discharge plate. For this reason, in the garbage truck described above, the discharge plate may go too far forward to hold the compressive force acting on the dust.

  Further, in the above-described garbage collection vehicle, the back pressure side oil chamber of the discharge cylinder is communicated with the oil reservoir for a certain period of time by detecting that the hydraulic pressure acting on the dust loading device has reached a set value or more. Since the hydraulic pressure is easily affected by temperature changes around the hydraulic actuator that controls the dust loading device, it is difficult to control the discharge plate at an appropriate position that can be held against the compressive force acting on the dust. It was.

  Therefore, in the present invention, when loading the dust into the dust storage box by the dust loading device, a dust collection vehicle capable of controlling the discharge plate at an appropriate position that can be held against the compressive force acting on the dust. The purpose is to provide.

  A first garbage collection vehicle according to the present invention is mounted on a chassis and has a dust storage box having an opening at the rear, a dust input box disposed in a tiltable manner in the opening of the dust storage box, and the dust A dust loading device that is installed inside a charging box and loads dust into the dust container box by a hydraulic actuator, a discharge plate that is disposed inside the dust container box by a discharge cylinder, and that can be moved back and forth by the discharge cylinder. Among the acting loads, a load sensor for detecting a load acting in the front-rear direction of the dust container, a release valve connected to a back pressure side hydraulic circuit of the discharge cylinder, and capable of discharging back pressure side pressure oil, and the discharge A garbage collection vehicle including a position control means for controlling the position of the plate, wherein the position control means is configured such that when the load value detected by the load sensor is equal to or greater than a first threshold value, the load value is Less than the first threshold It becomes until and controls to advance the discharge plate by opening the release valve.

  According to the first garbage collection vehicle, when the load value detected by the load sensor becomes equal to or greater than the first threshold value, the release valve is opened by the position control means until the load value is less than the first threshold value, and then discharged. Since the plate is controlled to move forward, the discharge plate can be continuously controlled at an appropriate position where it can be held against the compressive force acting on the dust. Further, since the position control means determines the position of the discharge plate based on the load value, the position of the discharge plate can be controlled without being influenced by the surrounding temperature change or the like. Thereby, since dust can be efficiently accommodated in the dust storage box, the amount of dust loaded in the dust storage box can be increased as compared with the conventional case.

  The first refuse collection vehicle further includes a hydraulic sensor that detects a hydraulic pressure acting on a hydraulic actuator of the dust loading device, and the position control means has a load value detected by the load sensor as the first threshold value. And when the hydraulic pressure value detected by the hydraulic pressure sensor exceeds a predetermined value, the release valve is opened for a predetermined time to advance the discharge plate, and then the load value is the first threshold value. It is preferable to control to increase the hydraulic pressure on the back pressure side of the discharge cylinder until a lower second threshold value is reached. According to this configuration, when the hydraulic pressure value detected by the hydraulic pressure sensor exceeds a predetermined value, the position control means once advances the discharge plate until the load value acting on the discharge plate reaches the second threshold value. Since the hydraulic pressure on the back pressure side of the discharge cylinder is controlled to increase, the discharge plate is steplessly positioned at an appropriate position that can be held against the compressive force acting on the dust while suppressing an excessive load on the hydraulic actuator Can be controlled.

  A second garbage collection vehicle of the present invention is mounted on a chassis and has a dust storage box having an opening on the rear side, a dust input box disposed in a tiltable manner in the opening of the dust storage box, and the dust A dust loading device that is installed inside the charging box and loads dust into the dust receiving box by a hydraulic actuator, a discharge plate that is disposed inside the dust receiving box by a discharge cylinder, and that is freely movable forward and backward, and the dust loading A hydraulic pressure sensor that detects a hydraulic pressure acting on a hydraulic actuator of the apparatus; a load sensor that detects a load acting on a front and rear direction of the dust container out of a load acting on the discharge plate; and a back pressure side hydraulic pressure of the discharge cylinder A garbage collection vehicle connected to a circuit and capable of discharging back pressure side pressure oil and a position control means for controlling the position of the discharge plate, wherein the position control means is connected to the hydraulic sensor. When the detected hydraulic pressure value exceeds a predetermined value, the release valve is opened for a predetermined time to advance the discharge plate, and then the discharge value is detected until the load value detected by the load sensor reaches a threshold value. Control is performed to increase the hydraulic pressure on the back pressure side of the cylinder.

  According to the second garbage collection vehicle, when the hydraulic pressure value detected by the hydraulic pressure sensor exceeds a predetermined value, the load value acting on the discharge plate is set to the threshold value after the discharge plate is once advanced by the position control means. The exhaust plate is controlled to increase the hydraulic pressure on the back pressure side of the discharge cylinder until it reaches the limit. Can be controlled steplessly. Further, since the position control means determines the position of the discharge plate based on the load value, the position of the discharge plate can be controlled without being influenced by the surrounding temperature change or the like. Thereby, since dust can be efficiently accommodated in the dust storage box, the amount of dust loaded in the dust storage box can be increased as compared with the conventional case.

  According to the refuse collection vehicle of the present invention, the discharge plate can be controlled steplessly at an appropriate position that can be held against the compressive force acting on the dust. Thereby, since dust can be efficiently accommodated in the dust storage box, the amount of dust loaded in the dust storage box can be increased as compared with the conventional case.

It is a section side view showing one embodiment of the garbage truck of the present invention. FIG. 2 is a hydraulic circuit diagram of the refuse collection vehicle of FIG. 1. It is a block diagram which shows the input-output state with respect to the control apparatus of the garbage truck of FIG. It is explanatory drawing which shows the attachment position of the non-contact switch and operation switch of the refuse collection vehicle of FIG. It is a flowchart which shows the position control method of the discharge plate of the refuse collection vehicle of FIG.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. In the following description, in the front-rear direction, the side on which the dust is loaded will be described as the rear, and the opposite side as the front, based on the dust storage box.

  FIG. 1 shows an embodiment of the garbage truck according to the present invention. The garbage collection vehicle 1 includes a dust storage box 2 mounted on a chassis, a dust input box 3 and the like disposed in a rear opening 4 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 to communicate with the rear opening 4 of the dust container 2, and the input port 6 is opened below the back surface, and a dust storage chamber 7 is formed in the lower part. Has been. 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.

  Guide groove members 8 made of channel steel are laid on both side walls of the dust box 3 so as to incline from the front upper end toward the rear lower portion. In addition, an elevating plate 9 extending in the horizontal direction is accommodated in the dust box 3, and guide rollers 10 are mounted on the upper and lower sides of the elevating plate 9, and these guide rollers 10 are guided groove members 8. It is fitted so as to roll along the inner wall. 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, a first telescopic cylinder (elevating cylinder) 13 is provided along the inclination direction of the guide groove member 8 between the pivot 11 and the lower outer side of the dust box 3 and its rear surface. Displaced upward. 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 first expansion cylinder 13.

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

  The first telescopic cylinder 13 and the second telescopic cylinder 17 described above correspond to the hydraulic actuator of the dust loading device A.

  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. A discharge cylinder 19 is connected to the bracket 25 fixed to the front portion of the dust container 2. A load sensor 20 is disposed between the discharge cylinder 19 and the lower portion of the discharge plate 18. Thereby, since the discharge plate 18 and the discharge cylinder 19 are connected via the load sensor 20, the discharge plate 18 can be reciprocated back and forth within the dust container 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, and the large-diameter cylinder side is connected to the load sensor 20 and the tip small-diameter cylinder side is connected to the bracket 25.

  The load sensor 20 detects a longitudinal load acting on the discharge plate 18. Examples of such a load sensor 20 include a load sensor using a spring, a piezo film, a strain gauge, and the like.

  Further, a lashing cylinder 21 pivotally supported at one end is disposed at the rear rear portion of the dust container 2, and the other end is connected to a lash nail 22 pivotally supported at the lower part of the dust container 2. Yes. The lashing claw 22 is engaged with a U-bolt 23 fixed on the front surface of the dust throwing box 3, thereby securing the dust throwing box 3 to the dust container 2.

  Next, the hydraulic circuit of the garbage truck 1 will be described with reference to FIG.

  This hydraulic circuit includes a hydraulic pump P, an oil reservoir T, an electromagnetic control valve V1 that controls expansion and contraction of the first expansion cylinder 13, an electromagnetic control valve V2 that controls expansion and contraction of the second expansion cylinder 17, and an electromagnetic control that controls expansion and contraction of the discharge cylinder 19. The valve V3, the lashing cylinder 21, and an open / close cylinder 24 for opening and closing the dust container 3 are configured to include an electromagnetic control valve V4 that controls expansion and contraction.

  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.

  In addition, a hydraulic pressure sensor PS for detecting the hydraulic pressure is connected to a circuit communicating with the back pressure side oil chamber of the second telescopic cylinder 17. A release valve V and a relief valve R are connected to a circuit communicating with the back pressure side oil chamber of the discharge cylinder 19. The release valve V has a solenoid SOLg, and is normally biased to a 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 is switched to a position communicating with 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. The relief valve R is activated when the load on the discharge cylinder 19 becomes excessive. Usually, as will be described later, the load value detected by the load sensor 20 and the hydraulic pressure value detected by the hydraulic sensor PS. Based on this, the discharge cylinder 19 is expanded and contracted to control the position of the discharge plate 18.

  Next, an input / output state with respect to a control device PLC (programmable logic controller) that controls the dust loading device A, the discharge plate 18 and the like will be described with reference to FIGS.

  The driver's seat of the garbage collection vehicle 1 is provided with a selection switch SW1 for selecting a dust loading operation and a dust discharge operation, an open / close switch SW2 for the dust input box 3, an advance / retreat switch SW3 for the discharge plate 18, and the like. 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 the like are provided (see FIG. 4).

  In addition, a non-contact switch LS1 for detecting the most extended state of the first telescopic cylinder 13 for raising and lowering the lift plate 9 and a non-contact switch for detecting the most contracted state of the first telescopic cylinder 13 are disposed in the dust box 3. LS2, a non-contact switch LS4 for detecting the most extended state of the second telescopic cylinder 17 that swings the pushing plate 14, a non-contact switch LS3 for detecting the most contracted state of the second telescopic cylinder 17 are provided. (See FIG. 4). The contactless switches LS1 and LS2 are switched between a dust throwing box 3 and a first telescopic 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 second telescopic cylinder 17 with a detection body disposed on one side and a detected body on the other side. As the contactless switches LS1 to LS4, for example, photoelectric switches, proximity switches and the like can be used.

  These various switches SW1 to SW6, contactless switches LS1 to LS4, solenoids SOLa to SOLi, hydraulic pressure sensor PS, and load sensor 20 are connected to the control device PLC, and the control device PLC includes various switches SW1 to SW6. It is programmed to output to the corresponding solenoids SOLa to SOLi according to a preset procedure based on the input status of the contact switches LS1 to LS4, the hydraulic pressure sensor PS and the load sensor 20.

  Next, the operation of the garbage truck 1 configured as described above will be described.

  First, the operation of the dust loading device A will be described. The dust loading device A is normally stopped at the end of the dust loading process shown by the solid line (a) in FIG. In this state, both the first telescopic cylinder 13 and the second telescopic cylinder 17 are in the most extended state, and the contactless switches LS1 and LS4 are operated. Thereby, the raising / lowering plate 9 is arrange | positioned in the raising limit position, and the pushing board 14 is each arrange | positioned in the front swing limit position. In this state, when the operator puts dust into the storage chamber 7 through the inlet 6 of the dust throwing box 3 and presses the start switch SW4, the controller PLC energizes the solenoid SOLd and moves the electromagnetic control valve V2 to the upper position. Switch to. As a result, the second telescopic cylinder 17 is contracted to reverse the pushing plate 14 until the compression surface thereof is in a substantially horizontal position as shown in FIG.

  When the pushing plate 14 reaches the rearward swing limit position, that is, when the second telescopic cylinder 17 contracts to the maximum, the contactless switch LS3 is activated, and the controller PLC releases the energization to the solenoid SOLd to release the electromagnetic control valve. At the same time as returning V2 to the neutral position, the solenoid SOLb is energized to switch the electromagnetic control valve V1 to the upper position. As a result, the first telescopic cylinder 13 is contracted to lower the elevating plate 9 along the guide groove member 8. As a result, as shown in FIG. 1 chain lines (b) to (c), the pushing plate 14 connected to the elevating plate 9 descends in parallel while holding its compression surface so as to be substantially horizontal. The dust can be crushed between the arc surface of the bottom surface of the charging box 3.

  When the elevating plate 9 reaches the lower limit position, that is, when the first telescopic cylinder 13 contracts to the maximum, the non-contact switch LS2 is activated, and the controller PLC releases the energization to the solenoid SOLb to neutralize the electromagnetic control valve V1. Simultaneously with returning to the position, the solenoid SOLc is energized to switch the electromagnetic control valve V2 to the lower position. As a result, the second telescopic cylinder 17 is extended from the dust crushing end state shown in the chain line (c) of FIG. 1, and the push plate 14 is moved around the pivotal support 15 as shown in the chain line (d) of FIG. Swing clockwise until the compression surface is approximately vertical. As a result, the pushing plate 14 can secondarily compress the dust primarily crushed in the previous stroke with the flat surface of the bottom surface of the dust box 3.

  When the push plate 14 reaches the forward swing limit position, that is, when the second telescopic cylinder 17 is extended to the maximum, the contactless switch LS4 is activated, and the control device PLC releases the energization to the solenoid SOLc and releases the electromagnetic control valve. At the same time as returning V2 to the neutral position, the solenoid SOLa is energized to switch the electromagnetic control valve V1 to the lower position. As a result, the first telescopic cylinder 13 is extended from the end state of the compression stroke shown in FIG. 1 (d), and the pushing plate 14 is lifted in parallel while the compression surface thereof is held substantially vertical. The dust compressed in the process is loaded into the dust container 2. When the elevating plate 9 reaches the ascent limit position, that is, when the first telescopic cylinder 13 is extended to the maximum, the contactless switch LS1 is actuated, and the controller PLC releases the energization of the solenoid SOLa and releases the electromagnetic control valve. Return V1 to the neutral position. This completes the loading process.

  As described above, the dust loading device A operates in the order of the reverse stroke, the crushing stroke, the compression stroke, and the loading stroke by pressing the start switch SW4 (hereinafter, also referred to as “loading cycle”). The dust thrown into the charging box 3 can be loaded into the dust storage box 2.

  In the crushing process from the inversion end state shown in FIG. 1 chain line (b) to the chain line (c) in FIG. 1, the control device PLC starts when the lifting plate 9 starts to descend and the set time elapses. It is also possible to stop the lowering of 9 and shift to the compression stroke by the pushing plate 14. That is, even if the lowering of the elevating plate 9 is prevented by the dust and the first telescopic cylinder 13 has not reached the contraction side stroke end, the control device PLC may shift to the next compression stroke after a certain period of time. it can.

  Further, in the compression stroke, the control device PLC stops the compression stroke by the pushing plate 14 when the pushing plate 14 starts swinging forward and the set time elapses, and performs the loading stroke by the raising of the lifting plate 9. It can also be migrated. That is, even if the compression by the pushing plate 14 is prevented by the dust and the second telescopic cylinder 17 has not reached the extension side stroke end, the control device PLC shifts to the next loading stroke after a certain period of time. You can also.

  By the way, in the above-described dust loading process, the electromagnetic control valve V3 for controlling expansion / contraction of the discharge cylinder 19 is normally in a neutral position, and the piston cylinder side oil chamber and the piston back pressure side are in a state where the discharge cylinder 19 is extended. The oil chamber is port-blocked. As a result, 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 pushing plate 14 and the discharge plate 18.

  Next, a method for controlling the position of the discharge plate 18 will be described with reference mainly to FIGS.

  First, the operator activates the dust loading device A by pressing the start switch SW4 (step S1). Next, when the loading cycle is started (Yes in step S2), the discharge plate 18 is pressed by the reaction force of the dust to be compressed, and the load sensor 20 disposed between the discharge plate 18 and the discharge cylinder 19 is used. The load value detected by increases. When the load value is equal to or greater than the first threshold value (Yes in Step S3), the control device PLC energizes the solenoid SOLg until the load value becomes less than the first threshold value and opens the release valve V (Step S4). ). While the release valve V is open, the pressure oil is recirculated from the back pressure side oil chamber of the discharge cylinder 19 to the oil reservoir T, so that the discharge plate 18 moves forward due to the reaction force of the dust to be compressed. Thereby, the discharge plate 18 is disposed at an appropriate position that can be held against the compressive force acting on the dust. That is, the control device PLC corresponds to the position control means of the discharge plate 18.

  On the other hand, the load value is less than the first threshold value (No in step S3), and the hydraulic pressure value detected by the hydraulic pressure sensor PS, that is, the hydraulic pressure value of the back pressure side oil chamber of the second telescopic cylinder 17 that swings the pushing plate 14 is detected. Is equal to or greater than the predetermined value (Yes in step S5), the control device PLC energizes the solenoid SOLg for a predetermined time, for example, 1 second, and opens the release valve V (step S6). Thereby, similarly to the case of step S4, the discharge plate 18 moves forward.

  When the hydraulic pressure value detected by the hydraulic sensor PS is less than the predetermined value (No in step S5), the process returns to step S3 and performs the same operation.

  When the discharge plate 18 is moved forward in step S6, the control device PLC energizes the solenoid SOLf and switches the electromagnetic control valve V3 to the lower position. Thereby, pressure oil is supplied to the back pressure side oil chamber of the discharge cylinder 19 (step S7), and the back pressure side hydraulic pressure of the discharge cylinder 19 is increased. At this time, if the pressing force of the discharge plate 18 is higher than the reaction force of the dust to be compressed, the discharge plate 18 moves backward. When the load value reaches the second threshold value that is lower than the first threshold value (No in step S8), the control device PLC releases the energization to the solenoid SOLf and returns the electromagnetic control valve V3 to the neutral position. Thereby, the supply of the pressure oil to the back pressure side oil chamber of the discharge cylinder 19 is stopped (step S9), and the discharge plate 18 is disposed at an appropriate position that can be held against the compressive force acting on the dust.

  The second threshold value in step S8 is not particularly limited as long as it is lower than the first threshold value in step S3. For example, the second threshold value may be about ½ to 3/4 of the first threshold value.

  If the load value is less than the second threshold value (Yes in step S8), the process returns to step S7 and the same operation is performed.

  When the supply of the pressure oil to the back pressure side oil chamber of the discharge cylinder 19 is stopped by the step S9 and the dust loading operation is continued, that is, during the loading cycle (Yes in step S10), the step S3 Return to and do the same. On the other hand, when there is no dust to be loaded during the continuous loading cycle (No in step S10), the operator presses the stop switch SW5 to stop the dust loading device A (step S11).

  According to the garbage truck 1 of the above embodiment, when the load on the second telescopic cylinder 17 that swings the push plate 14 increases and the hydraulic pressure detected by the hydraulic sensor PS becomes a predetermined value or more, the control is performed. In order to control the hydraulic pressure on the back pressure side of the discharge cylinder 19 until the load value acting on the discharge plate 18 reaches the second threshold after the discharge plate 18 has been moved forward by the device PLC, the second telescopic cylinder 17 While suppressing an excessive load, the discharge plate 18 can be controlled steplessly to an appropriate position that can be held against the compressive force acting on the dust. Thereby, since dust can be efficiently stored in the dust storage box 2, the amount of dust loaded in the dust storage box 2 can be increased as compared with the conventional case.

  The preferred embodiments of the present invention have been described above, but only specific examples are illustrated, and the present invention is not particularly limited, and the specific configuration and the like can be appropriately changed in design.

  For example, in the above embodiment, the position of the discharge plate is controlled based on the load value detected by the load sensor and the hydraulic pressure value detected by the hydraulic sensor. However, the position is detected by the load sensor without using the hydraulic sensor. It is good also as a structure which controls the position of a discharge plate only with the load value to be performed. Also in this case, since the position of the discharge plate is determined by the load value, the discharge plate can be continuously controlled at an appropriate position that can be held against the compressive force acting on the dust.

  Moreover, in the said embodiment, although the procedure which confirms a hydraulic pressure value after confirming a load value first is employ | adopted, you may employ | adopt the procedure which confirms a hydraulic pressure value before confirming a load value. In this case, for example, in FIG. 5, Steps S3 and S4 are not performed, and if Yes in Step S2, the process proceeds to Step S5, and if Yes in Step S10, the process returns to Step S5. Also in this case, since the position of the discharge plate is controlled by the hydraulic value and the load value, it is discharged to an appropriate position that can be held against the compressive force acting on the dust while suppressing an excessive load on the hydraulic actuator. The board can be controlled steplessly.

  Moreover, in the said embodiment, although the principal part of the dust loading apparatus was comprised with the raising / lowering board and the pushing board, the principal part can also be comprised with a rotation board and a pushing board, and the structure is not specifically limited.

DESCRIPTION OF SYMBOLS 1 Dust collection truck 2 Dust storage box 3 Dust input box 9 Lift plate 13 First telescopic cylinder (hydraulic actuator)
14 Pushing plate 17 Second telescopic cylinder (hydraulic actuator)
18 Discharge plate 19 Discharge cylinder 20 Load sensor A Dust loading device PLC Control device (position control means)
PS Hydraulic sensor V Release valve

Claims (3)

A garbage storage box mounted on the chassis and having an opening at the back;
A dust input box disposed to be freely tiltable at an opening of the dust storage box;
A dust loading device mounted inside the dust throwing box, and loading dust into the dust containing box by a hydraulic actuator;
A discharge plate disposed in the dust container box so as to be movable forward and backward by a discharge cylinder;
Among the loads acting on the discharge plate, a load sensor that detects a load acting in the front-rear direction of the dust storage box,
A release valve connected to the back pressure side hydraulic circuit of the discharge cylinder and capable of discharging back pressure side pressure oil;
A garbage collection vehicle comprising position control means for controlling the position of the discharge plate,
When the load value detected by the load sensor becomes equal to or greater than a first threshold value, the position control means opens the release valve and advances the discharge plate until the load value becomes less than the first threshold value. A garbage collection vehicle characterized by being controlled as follows. A hydraulic sensor that detects a hydraulic pressure acting on a hydraulic actuator of the dust loading device;
When the load value detected by the load sensor is less than the first threshold value and the hydraulic pressure value detected by the hydraulic pressure sensor is greater than or equal to a predetermined value, the position control means moves the release valve for a predetermined time. 2. The refuse according to claim 1, wherein after opening the discharge plate and moving the discharge plate forward, control is performed so as to increase the hydraulic pressure on the back pressure side of the discharge cylinder until the load value reaches a second threshold value lower than the first threshold value. Collection car. A garbage storage box mounted on the chassis and having an opening at the back;
A dust input box disposed to be freely tiltable at an opening of the dust storage box;
A dust loading device mounted inside the dust throwing box, and loading dust into the dust containing box by a hydraulic actuator;
A discharge plate disposed in the dust container box so as to be movable forward and backward by a discharge cylinder;
A hydraulic sensor for detecting a hydraulic pressure acting on a hydraulic actuator of the dust loading device;
Among the loads acting on the discharge plate, a load sensor that detects a load acting in the front-rear direction of the dust storage box,
A release valve connected to the back pressure side hydraulic circuit of the discharge cylinder and capable of discharging back pressure side pressure oil;
A garbage collection vehicle comprising position control means for controlling the position of the discharge plate,
When the hydraulic pressure value detected by the hydraulic pressure sensor exceeds a predetermined value, the position control means detects the load sensor after opening the release valve for a predetermined time to advance the discharge plate. A garbage collection vehicle that controls to increase the hydraulic pressure on the back pressure side of the discharge cylinder until a load value reaches a threshold value.

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