JPS6357324B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a garbage loading device for a garbage collection vehicle.

(Prior Art) As is well known, a garbage loading device for a garbage collection vehicle is
It has a tailgate that is pivotally attached to the vehicle body adjacent to an opening in the vehicle body, and a deflector, a scraping panel, etc. are provided inside the tailgate. The scraping panel performs a reversal operation in which it rotates upward in a direction away from the vehicle body opening, prior to the scraping operation, in order to scrape the garbage dumped into the tailgate into the vehicle body.

In conventional garbage loading devices, the vehicle body opening is partially opened in conjunction with this reversing movement of the scraping panel, and through the opened portion, the debris that has been pushed into the vehicle body flows back onto the tailgate sump. death,
There was also a problem in that the dust in the sump was thrown out of the tailgate by the reversing operation of the scraping panel.

In view of these problems, the present applicant has devised a method to push the debris stored in the vehicle body deeply into the vehicle body by displacing the deflector inward with the scraping panel using a pushing cylinder device. In JP-A-55-140402, we proposed a garbage loading device that aims to prevent the backflow of garbage into the sump and to prevent the garbage inside the sump from being thrown out when the raking panel is reversed. .

(Problems to be Solved by the Invention) This proposed garbage loading device replaces the operation of displacing the deflector inwardly with the scraping panel by the pushing cylinder device to the previous reversing, retreating, lowering, scraping, etc. Does not have a control system to ensure reliable operation after activation of the lift. In addition, the proposed garbage loading device has the advantage that when the ascending process after scraping in dust stops midway due to overload or other reasons, the remaining ascending process will continue when restarted after the stop. There is no guarantee that it will be done.

Therefore, according to the present invention, after the operations of reversing, retreating, lowering, scraping, and raising, the debris can be pushed deep into the vehicle body by the actuation of the deflector by the extension of the cylinder device, and the debris can be reliably pushed deep into the vehicle body after the debris has been scraped in. The purpose of this invention is to provide a garbage loading device for a garbage collection vehicle, in which even if the ascent process is stopped midway, the ascent process can be reliably performed by restarting after the stop.

(Means for Solving the Problems) A garbage loading device for a garbage collection vehicle according to the present invention includes a tailgate whose upper end is pivoted to the vehicle body adjacent to the vehicle body opening, and a boundary between the tailgate and the vehicle body opening. A panel-shaped deflector is suspended above the vehicle body opening by a lateral pivot and is swingable toward the inside of the tailgate, and is supported by the deflector so as to be slidable up and down along the surface of the deflector on the tailgate side. a slider, a vertical cylinder device for sliding the slider up and down with respect to a deflector, a scraping panel rotatably supported near the upper edge of the slider by a lateral pivot at the lower edge of the slider; A telescopic raking cylinder device has both ends pivotally connected to the tailgate side of the slider and the tailgate side of the raking panel, and one end is pivotally connected to the lateral axis between the slider and the raking panel, and the other end is attached to the tailgate of the vehicle body. A pushing cylinder device that is pivoted at a position far from the opening and is telescopic, and that pushes the raking panel to perform a deep pushing stroke when it is extended; and a pushing cylinder device that is connected to both sides of the raking cylinder device to control the expansion and contraction operation of the raking cylinder device. an electromagnetic switching valve provided between the hydraulic conduit and the hydraulic source; an electromagnetic switching valve device provided between the hydraulic power source so as to control expansion and contraction of the push cylinder device and expansion and contraction of the vertical movement cylinder device; an electric circuit including a solenoid for switching the switching valve and the switching valve device; the electric circuit includes a switch that detects the completion of reversal of the scraping panel due to contraction of the scraping cylinder device; An electrical connection including a solenoid for switching the switching valve device to contract the cylinder device and perform a backward displacement, a switch for detecting the completion of the backward displacement, and an extension of the vertical cylinder device in response to the detection operation of this switch. an electric connection including a solenoid for switching the switching valve device to perform a downward displacement; a switch for detecting completion of the downward displacement; and a raking cylinder device to extend and raking in response to the detection operation of this switch. An electrical connection including a solenoid for switching the switching valve, a switch for detecting the completion of raking by the raking panel, a switch for detecting the completion of upward displacement by the vertical cylinder device, and a switch for detecting the completion of raking by the vertical cylinder device. It has an electric means that acts on the solenoid to switch the switching valve device to contract the vertical cylinder device to perform upward displacement in accordance with the detection operation of the switch, and the detection of the switch detects the completion of the upward displacement. a circuit portion having electrical means for acting on a solenoid to switch the switching valve device to extend the pushing cylinder device in response to the operation to perform a deep pushing process, and a circuit connected in series to the switch for detecting completion of pushing. a keep relay which has a set coil connected to the switch and a reset coil connected in series to the switch for detecting the completion of upward displacement by the vertical motion cylinder device; and a keep relay which closes when the set coil is energized. The keep relay contact has a switching valve device so that the vertical movement cylinder device is contracted and upwardly displaced by the excitation of the set coil accompanying the detection operation of the switch that detects the completion of raking. The reset coil of the keep relay is energized by the detection operation of the switch that detects the completion of the upward displacement by the vertical movement cylinder device, regardless of the subsequent state of the switch that detects the completion of raking. It is characterized by being configured so that it continues to close until it closes.

(Function) In the above-mentioned configuration, when the reversal of the retraction panel is completed, the electric circuit is activated in response to the detection operation of the switch that detects this reversal, and the retraction cylinder device is contracted and displaced backward.
When the backward displacement is completed, an electric circuit is activated in accordance with the detection operation of the switch to detect this, and the vertically movable cylinder device is extended to perform the downward displacement. When the downward displacement is completed, an electric circuit is activated by the detection operation of the switch that detects it, and the scraping cylinder device is extended and scraping is performed by the scraping panel. Next, when the scraping is completed, the detection operation of the switch detects it.
An electrical circuit acts to retract the vertical cylinder device to effect an upward displacement. When the upward displacement is completed, the detection operation of the switch causes the electric circuit to extend the pushing cylinder device, and a deep pushing process is performed. In this way,
Reversing, retracting, lowering, scraping the panel,
Following the raising, the deep-pushing action of the dirt by the raking panel and deflector is carried out continuously and automatically by detecting the completion of the previous process by means of a detection switch. Even if the lifting process of the scraping panel to scrape up the dust stops midway due to overload or other reasons after dust scraping is finished, the set coil of the keep relay, which is energized by the operation of the switch that detects the completion of scraping, will keep it in place. The relay contact is closed, and this keep relay contact continues to close the electrical means that switches the switching valve device to contract the vertical cylinder device and perform upward displacement, so it is necessary to remove the cause of the overload and try again. Upon start-up, the remaining ascent stroke is subsequently started. The electrical means then remains closed until the reset coil of the keep relay is energized by the operation of the switch to detect the completion of the upward displacement.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

Fig. 1 and Fig. 2 which is a partial cross-sectional side view in principle.
The figure shows the state of the mechanical part of the garbage loading device of the present invention before the garbage loading operation starts. In the figure, reference numeral 1 denotes the body of a garbage collection vehicle, and a tailgate 2 is attached adjacent to an opening at the rear of the vehicle body as is well known. The tailgate 2 includes a pair of side plates 2a facing each other in the horizontal direction, a sump 2b constituting a bottom plate connecting the side plates, and beams 2c ₁ , 2c ₂ , 2c ₃ , etc. that integrally connect the side plates. It is configured.
The tailgate 2 includes brackets 4 fixed near both ends of a profile 3 fixed laterally to the rear of the vehicle body 1.
It is pivoted to by a transverse pivot pin 5.

On this pivot pin 5, the upper end tabs 7a of the side plate portions 7 at both lateral ends of the deflector 6 are pivotally supported. As is well known, the deflector 6 is connected to the tailgate 2.
It is a generally rectangular panel that extends across the entire lateral width of the vehicle. A pair of guide rails 8 are attached to the inner surface of each side plate portion 7 at intervals, and a guide groove is formed between these guide rails in a substantially vertical direction. Within the guide groove are protrusions 9a fixed along each side of the panel-shaped slider 9.
is inserted, and the slider 9 is slidable in the longitudinal direction of the guide rail.

The upper side of the scraping panel 11 is pivotally attached to the lower side of the slider 9 by a pivot pin 10 .
A mounting ear piece 12 is fixed to the tailgate 2 side surface of this pull-in panel 11, while a slider 9
A mounting lug 13 is also fixed to the upper part of the tailgate side surface of the cylinder, and the upper end of the cylinder 15a of the scraping cylinder device 15 is attached to the lug 13 by a pin 16.
It is pivoted to. The lower end of the piston rod 15b of the cylinder device 15 is pivotally connected to the lug 12 by a pivot pin 17.

The bracket 4 includes a vertically moving cylinder device 1.
The upper end of the cylinder 19a of 9 is pivotally connected by the aforementioned pivot pin 5, and the piston rod 19a is
The lower end of b is pivotally supported by the pin 10. The vertically movable cylinder device 19 is housed inside the slider 9, for example inside its side frame 9a (FIG. 1).

Reference numeral 21 denotes a push-in cylinder device, the cylinder 21a of which is pivotally connected to the rear part of the tailgate 2 by a pivot pin 22, and the piston rod 21b
is pivotally supported by the pivot pin 10. pin 22
is provided on a mounting bracket 23 fixed to the beam 2c ₂ of the tailgate 2.

A pivot pin 24 is supported by the mounting bracket 23, and the tip of a piston rod 26b of the tailgate dump cylinder device 26 is pivotally attached to this pin, and the cylinder 26a of the dump cylinder device 26 is connected to the pivot pin 24.
is pivotally connected to the bracket 4 by a pivot pin 27.

The cylinder devices 19, 21, 26, etc. described above are provided on each side of the tailgate side plate, and the scraping cylinder device 15 is provided at the center of the width of the slider 9. In addition, the sump 2 of the tailgate 2
An engaging portion 29 that is supported in contact with the rear edge of the floor portion 1a of the vehicle body 1 is provided at the front end of the vehicle body 1.

Next, the functions of the above-mentioned mechanical parts will be explained.

In the state shown in FIGS. 1 and 2, which is the state before the start of the loading operation, the pushing cylinder device 21 is extended, and the deflector 6, slider 9, push-in panel 11, etc. are slightly pushed into the interior of the vehicle body 1 around the pivot pin 5. It is moving forward to the position where it can enter. Therefore, the dust inside the vehicle body is pushed deeper into the vehicle body, making it difficult for it to flow back toward the tailgate 2.

In this state, the reversing operation of the scraping panel 11 is started. For this purpose, the raking cylinder device 15 is retracted. This allows the pivot pin 1
7. The pull-in panel 11 receives a counterclockwise rotational force around the pivot pin 10 via the mounting tab 12, and swings as shown by arrow A to assume the position shown in FIG. In this way, since the scraping panel 11 is reversed inside the vehicle body, compared to a case where the scraping panel is reversed inside the tailgate, the dust inside the tailgate is not thrown out when the vehicle is reversed.
Even if there is a splash of dust, it will only fall onto the tailgate sump 2b.

Next, the push-in cylinder device 21 is retracted, thereby displacing the inverted push-in panel 11 in the direction indicated by arrow B. This displacement is a rotation about the pivot pin 5. The position thus obtained is as shown in FIG.

In this position, the vertical cylinder device 19 is extended. As a result, as the push-in cylinder device 21 rotates around the pivot pin 22, the push-in panel 11 is lowered as shown by arrow C to assume the position shown in FIG.

In the position of FIG. 5, a raking operation is performed by extending the raking cylinder device 15. That is, the scraping panel 11 performs scraping by rotating around the pivot pin 10 such that the tip 11a is displaced along the upper surface of the sump 2b, as shown by arrow D in FIG. reach the position. From this position, the vertically movable cylinder device 19 starts to contract, and the scraping panel 11 rises while scraping up the dust along the upper surface of the sump 2b, reaching the position shown in FIG. 7.

When the pushing cylinder device 21 is extended in this state, the deflector 6 and the pushing panel 11 are extended.
moves forward in the direction of arrow F toward the vehicle body while pushing the dirt, and is pushed in deeply, so that the above-mentioned effect can be obtained.

Incidentally, when discharging the dust collected in the vehicle body, the tailgate dump cylinder 26 is contracted in the state shown in FIG. 7. As a result, a counterclockwise moment corresponding to the product of the contraction force of the cylinder device 26 and the distance m between the pivot pins 5 and 27 (FIG. 2) acts around the pivot pin 5, and the tailgate 2 It rotates in the direction shown by arrow G in Figure 7 and is flipped up. Therefore, in this state, the collected garbage is discharged from the vehicle body.

As explained above, the scraping cylinder device 1
5. In order to sequentially operate the push-in cylinder device 21 and the vertical cylinder device 19, according to the present invention, a hydraulic circuit and an electric circuit, which will be explained from now on, are used. Regarding the various limit switches inserted into the electric circuit, First, explanation will be given with reference to FIG.

In the same figure, LS-1 and LS-2 are limit switches that operate when the pushing cylinder device 21 is extended and the deflector 6 is fully pushed. Both switches LS-1 and LS-2 are normally closed contacts. It is equipped with These switches are supported by a support member 31 fixed to the deflector 6.
A bell crank lever 33 is pivotally attached to the support member 31 by a pin 32, and the lower end of this lever 33 is configured as an actuator 33a that acts on limit switches LS-1 and LS-2. on the other hand,
The upper end of the lever 33 is connected to a link 35 by a pin 34.
The base end of the link 35 is pivotally connected to the side plate 2a of the tailgate 2 by a pin 36. In the state shown in FIG. 8, the actuator 33
A contacts both limit switches LS-1 and LS-2, opening their normally closed contacts.

On the other hand, when the deflector 6 rotates counterclockwise in FIG. 8, the bell crank lever 33 begins to rotate counterclockwise around the pin 32, and the actuator 33a releases the limit switches LS-1 and LS-2. However, when the deflector 6 is completely rotated to the right, the actuator 33a is further displaced, contacts another limit switch LS-5 supported by the support member 31, and displaces its contact point. Limit switch LS-5
is a double-throw switch, as shown in FIG. 10, and is normally in the upper position shown in FIG. 10, in contact with the upper contact, and is displaced to the lower position by the action of actuator 33a.

On the other hand, a support member 39 is also fixed to the slider 9, and limit switches LS-3, LS-4,
LS-8 is supported. In order to operate these limit switches, a dog-shaped link mechanism 40 is provided, one end of which is pivotally connected to the slider 9 and the other end of which is pivotally connected to the scraping panel 11. A central pivot portion of this link mechanism 40 constitutes an actuator 40a. In the state shown in FIG. 8, the actuator 40a contacts the limit switch LS-8 and closes its normally open contact. On the other hand, when the pull-in panel 11 rotates counterclockwise around the pivot shaft 10 for reversal and reaches the reversal completion position, the bending angle of the doglegged link mechanism 40 becomes smaller and the actuator 40a is displaced upward. Acts on limit switches LS-3 and LS-4. This opens the normally closed contact of limit switch LS-3 and closes the normally open contact of limit switch LS-4.

At the top of deflector 6 is a limit switch LS.
-9, and two limit switches LS-6 and LS-7 are supported below it. 42 is
It is an actuator fixed to the cylinder of the scraping cylinder device 15, and is a limit switch LS-6, LS.
-7, affects LS-9. In the state shown in FIG. 8 in which the vertically movable cylinder device 19 is contracted, the actuator 42 acts on the limit switch LS-9 and closes its normally closed contact. On the other hand, at the position where the vertical cylinder device 19 is extended and the slider 9 is completely lowered, the actuator 42 is also lowered and the limit switches LS-6, LS
- It affects 7. Limit switch LS-7 has a normally open contact, which is closed by actuator 42, while limit switch LS-6 has a tenth
As shown in the figure, it is of a double-throw type, with its upper contact normally closed and its lower contact closed by the action of actuator 42.

FIG. 9 shows a hydraulic circuit that is in charge of supplying pressure oil to the pushing cylinder device 15, pushing cylinder device 21, and vertical movement cylinder device 19 and discharging the pressure oil therefrom. The hydraulic power source includes a pump 45, to which a relief valve 46 is connected. 4
7 and 48 are 3-position electromagnetic switching valves with solenoid
Switching is performed by SOL1, SOL2 and SOL3, SOL4. When both the switching valves 47 and 48 are at their neutral positions, pressure oil is not sent beyond the switching valves.

Pipe lines 49 and 50 exit from the switching valve 47 and are connected to ports at both ends of the scraping cylinder device 15. On the other hand, the pipe 50 communicates with the oil sump via a relief valve 51, and the pipe 49 communicates with the oil sump via a check valve 52.

Pipe lines 53 and 54 also come out from the switching valve 48, and the pipe line 54 communicates with the upper port of the vertical movement cylinder device 19 and also with the port on the forward side of the push cylinder device 21 via the pilot check valve 55, respectively. are doing. The pipe line 53 is a two-position electromagnetic switching valve 57
is connected to a conduit 58 via which the conduit is connected to a port on the rear side of the pushing cylinder device 21. A lower port of the vertically movable cylinder device 19 is connected to a switching valve 57 by a conduit 59.

FIG. 10 shows a control electric circuit including all solenoids SOL1 to SOL5 and all limit switches LS-1 to LS-9 of the aforementioned switching valve. In this circuit, SW1 is a short circuit switch for switching between "normal cycle" and "short circuit", SW2 is a switch for switching between "single cycle" and "continuous operation", and CR1 is a normally open contact CR
1', CR1'', CR2 is a normally closed contact
CR2', normally open contact CR2'', relay with CR2, CR3 has normally open contact CR3' and normally closed contact CR
3″ relay, CR4 has a normally closed contact CR4′,
KCR is a short-circuit relay having CR4 and a normally open contact CR4'', KCR is a keep relay having a set coil S, a reset coil R, and normally open contacts KCR', KCR'', and PB is a push button switch.

Next, the operation of the control device consisting of the hydraulic circuit and electric circuit described above will be explained.

To start operation, which begins with the reversal of the scraping panel 11 from the state shown in FIG. 2 to the state shown in FIG. 3, first push the push button switch PB shown in FIG. 10. This energizes relay CR1 and closes relay contacts CR1' and CR1''.At this time, normally closed limit switch LS-3 is closed, and limit switches LS-5 and LS-6 are in a free state. These limit switch circuits and contact CR are in contact with the upper contact as shown in the diagram.
Solenoid SOL1 is energized via 1'. By energizing the solenoid SOL1, the switching valve 47 is switched to the left in FIG. 9, and the pressure oil is transferred to the pump 45.
is supplied to the lower cylinder space of the scraping cylinder device 15 through the pipe line 49, and is supplied to the lower cylinder space of the scraping cylinder device 15.
5 is contracted. Therefore, the scraping panel 11
is reversed counterclockwise.

When the scraping panel 11 moves to the reversal completion position shown in FIG. 3, the limit switches LS-3 and LS-4 are operated by the actuator 40a. That is, the normally closed limit switch LS-3 is opened and the normally open limit switch LS-4 is closed. Therefore, the excitation of solenoid SOL1 is cut off, and the solenoid
SOL3 is energized, and in FIG.
returns to the neutral position, the supply of pressure oil to the pushing cylinder device 15 is stopped, the switching valve 48 moves to the left, and the pressure oil passes through the pipe 54 and the pilot check valve 55 to the left cylinder space of the pushing cylinder device 21. The cylinder device 21 contracts. Then,
All members are displaced back toward the position of FIG. In this way, the electrical connection including the solenoid SOL3 and the limit switch LS-4 causes the pushing cylinder device 21 to contract in response to the detection operation of the switch LS-4 which detects the completion of reversal of the pushing panel 11 due to the contraction of the pushing cylinder device 15. means for operating the solenoid SOL3 for switching the switching valve device 48 so as to perform a backward displacement.

When the deflector 6 begins to rotate from the position shown in Figure 3 to the position shown in Figure 4, the normally closed limit switch
Since LS-1 and LS-2 are released from the actuator and closed, even if the push button switch PB is turned off, the relay will not close.
CR1's self-holding circuit is limit switch LS-1
It is established through Note that at the same time that pressure oil is supplied to the left cylinder space of the pushing cylinder device 21, the upper cylinder space of the vertically moving cylinder device 19 also communicates with the pressure oil source, and the pressure oil return pipe 5
9 is closed by the switching valve 57, the vertical cylinder device 19 does not move.

When the member reaches the position shown in FIG. 4, the limit switch LS-5 is pressed by the actuator 33a,
It is switched from the upper position shown in FIG. 10 to the lower position. Therefore, solenoid SOL5 is energized, while solenoid SOL3 continues to be energized because limit switch LS-4 is in the activated state and closed. By energizing the solenoid SOL5, the switching valve 57 is switched to the left from the position shown in FIG.
3 to the oil reservoir, the vertically movable cylinder device 19 extends downward due to the hydraulic pressure that continues to act on the cylinder space above it. In addition, since the pipe line 58 is closed by switching the switching valve 57, the pushing cylinder device 21 does not move.
All the members are thus displaced from the state shown in FIG. 4 to the state shown in FIG. In this way, the electrical connections including limit switch LS-5 and solenoid SOL5 connect to switch LS-5, which detects the completion of backward displacement.
- Vertical cylinder device 19 according to the detection operation of 5.
The switching valve device 5 is configured to extend and perform a downward displacement.
7 constitutes a means for operating a solenoid SOL5 for switching.

By reaching the lowered position shown in FIG.
-Touch 7 to activate it. When the limit switch LS-6 is acted upon by the actuator 42,
It is displaced from the upper position to the lower position in FIG. 10 and comes into contact with the lower contact, the excitation of the solenoids SOL3 and SOL5 is cut off, the switching valve 59 moves to the right and closes the conduit 57, whereby the vertical movement cylinder When the device 19 stops extending downward, the solenoid SOL2 is energized. Therefore, in FIG. 9, the switching valve 47 moves to the right from the neutral position, and the pressure oil from the pump 45 is sent into the cylinder space above the scraping cylinder device 15 through the pipe 50. Therefore, the scraping cylinder device 15 extends downward, and scraping is performed from the state shown in FIG. 5 to the state shown in FIG. 6. In this way, the electrical connection including limit switch LS-6 and solenoid SOL2 connects to switch LS-6, which detects the completion of downward displacement.
- Scraping cylinder device 1 according to the detection operation of 6.
The switching valve 47 is configured to extend the
This constitutes means for operating the lenoid SOL2 for switching. In addition, the limit switch LS
Reference numeral 7 has a normally open contact, which is closed by the action of the actuator 42 at the aforementioned lowering completion position (FIG. 5).

When the scraping panel 11 reaches the state shown in Fig. 6, the limit switch LS is activated by the action of the actuator 40a.
-8 closes. At this time, relay CR1 is in the excited state and its contact CR1'' is closed, and the relay
Since normally closed contacts CR3'' and CR4 of CR3 and CR4 are also closed, relay CR2 is energized, and its normally closed contact CR2' opens and its normally open contacts CR2'' and CR2
closes. Relay CR is activated by closing contact CR2″.
2 is self-maintained. Furthermore, the solenoid SOL4 is energized by the closing of the contact CR2. on the other hand,
By closing the limit switch LS-8,
Keep relay via limit switch LS-7
The set coil S of KCR is energized. The normally open contact of limit switch LS-7 is closed at this time by the action of actuator 42. Keep relay KCR
The normally open relay contact is set by energizing the set coil S.
KCR', KCR'' are closed, so that the solenoid SOL5 is energized again via the closed relay contacts CR2 and KCR''. In this way, by energizing the solenoids SOL4 and SOL5, the switching valve 48 is switched to the right and the switching valve 57 is switched to the left, so that the pressure oil is transferred from the pump 45 to the switching valves 48 and 57. and is sent into the cylinder space below the vertically moving cylinder device 19,
The cylinder device 19 begins to contract upward,
All members begin to move toward the state of FIG. As you can see from the above, the limit switch
LS-8, relay CR2, limit switch LS-
7. Wiring including keep relay KCR, relay contacts
CR2, wiring including solenoid SOL4, relay contact CR2, keep relay contact KCR'',
The part of the electrical circuit consisting of the wiring that includes the solenoid SOL5 is connected to a switch that detects the completion of raking.
Solenoid SOL for switching the switching valve devices 48 and 57 to contract the vertical cylinder device 19 and perform upward displacement according to the detection operation of the LS-8.
4. Configure electrical means to operate SOL5.

When the state shown in Fig. 7 is reached, the actuator 42 acts on the limit switch LS-9, and its contact closes, so that the reset coil R of the keep relay KCR is activated.
is energized and its contacts KCR′, KCR″ open, while relay CR3 is energized and its normally open contact CR
3' closes and normally closed contact CR3'' opens. Therefore,
Solenoid SOL5 is de-energized and relay CR2 is self-held by its contact CR2'', so the solenoid
Only SOL4 continues to be energized, so the switching valve 57
returns to the position shown in FIG. 9, and the vertical movement cylinder device 19
The upward contraction stops, and pressure oil is sent into the right cylinder space of the push-in cylinder device 21 via the switching valve 57, and the push-in cylinder device 21
begins to elongate, and deep indentation begins from the state shown in FIG. 7 to the state shown in FIG. As you can see from the above, limit switch LS-9, keep relay
Wiring including KCR reset coil R, keep relay contact KCR'', wiring including solenoid SOL5,
The part of the electric circuit consisting of the connections including relay contact CR2 and solenoid SOL4 is switched to extend the push cylinder device 21 and perform deep push in response to the detection operation of switch LS-9 that detects the completion of upward displacement. It constitutes an electrical means for operating the solenoids SOL4 and SOL5 for switching the valve devices 48 and 57.

Upon completion of deep pressing, all members are in the second position.
Reach the position shown in the figure or figure 8 and press the limit switch.
Since LS-1 and LS-2 open under the action of actuator 33a, the excitation of relays CR1 and CR2 is cut off, the entire stroke is completed, and everything stops. Note that when the dust reaction force acting on the scraping cylinder device 15 exceeds a set value, an unloading action is performed by the relief valve 51, so that no unreasonable force is applied to the scraping panel 11.

One cycle is completed as described above, but if continuous operation switch SW2 is turned on, relay CR1 will continue to be energized even after the entire stroke is completed, so the cycle described above will restart. and multiple cycles can be performed in succession.

``Normal cycle'' and ``Short service'' mentioned above
The short-circuit switch SW1 is left open in the normal cycle mentioned above, but this switch
1, the deep push stroke can be omitted at the end of the ascent. If the short-circuit switch SW1 is closed, the short-circuit relay CR4 will be energized when the limit switch LS-9 is closed when the lift end position shown in Fig. 7 is reached, and the contact CR4 will be energized.
4', CR4 opens and contact CR4'' closes. Contact
Relay CR is activated by opening CR4' and CR4.
1. The excitation of CR2 is cut off, relay contact CR2 opens, the excitation of solenoid SOL4 is cut off, and the switching valve 4
8 returns to neutral position. Therefore, no pressure oil is sent to the pushing cylinder device 21, and no deep pushing stroke is performed, and on the other hand, the excitation of the relay CR1 is also cut off, so all operations are stopped.

In addition, as in the case already mentioned, the changeover switch
If SW2 is turned on, relay CR1 will continue to be energized even if relay CR2 is de-energized, so only solenoid SOL1 will be energized, and the reversing operation of scraping panel 11 will begin immediately without deep pushing.

Due to the upward stroke, that is, the contraction of the vertical cylinder device 19, the scraping panel 11 and the slider 9
During the process of rising, relay CR2 is in an excited state, so contact CR2 of relay CR2
closes to energize solenoid SOL4, and closes contact KCR'' of keep relay KCR to energize solenoid SOL4.
Exciting SOL5. If the circuit is cut off in this state due to an overload or the like, the excitation of the solenoids SOL4 and SOL5 will be cut off and the upward stroke will be interrupted. When pushbutton PB is pressed after this interruption, contacts KCR' and KCR'' of keep relay KCR, which do not change state unless the reset coil R is energized, remain closed, so contact CR1'' of relay CR1 is closed. relay via contact KCR′
Since CR2 is energized, which closes contact CR2, solenoids SOL4 and SOL5 are immediately energized again and the upward stroke is resumed. In other words, the contacts KCR' and KCR'' of the keep relay KCR perform the memory function of the ascending stroke. Therefore, even if the ascending stroke stops midway, the remaining ascending stroke will not energize the electric circuit. If you do that, you can continue until the end.

When deep pushing is performed by the scraping panel 11, it may become difficult to push to the final position due to the garbage that has been collected and is nearly full. In this case, the push-in operation is stopped by turning off the power using a push button for opening the power supply (not shown), and then when the push button PB is pressed, the limit switch LS-9 has already been pushed by the actuator 42. By being closed, contact CR3' of relay CR3, which is energized via limit switch LS-9, is closed, and solenoid SOL1 is energized via limit switch LS-3, which is also closed. And, this state remains the same even after releasing the push button PB.
Retained via CR1'. When the solenoid SOL1 is energized, the switching valve 47 moves to the left, pressure oil is sent into the lower cylinder space of the scraping cylinder device 15, and the scraping panel 11 is reversed. On the other hand, until the pushing stops, the pushing cylinder device 21
Because the switching valve 48 is closed, no pressure oil is sent to the pipe line 58 that was sending pressure oil into the cylinder space behind the cylinder, so even if the push button PB is pressed, no further pushing stroke is performed. That is, even if pushbutton PB is pressed, relay CR2 is not energized, so its contact CR2 remains open, solenoid SOL4 is not energized, so switching valve 48 remains in the neutral position, and push cylinder device 21 is Not activated.

(Effects of the Invention) As described above with respect to the embodiments, in the present invention, after the deflector and the scraping panel are deeply swung into the vehicle body by the pushing cylinder device to push the debris, the scraping panel is reversed. As a result, it is possible to prevent the backflow of dust inside the car body, and also to get the effect of scraping dust inside the tailgate so that it will not be thrown out when the panel is reversed.
Each stroke of raking, raising, and deep pushing can be performed continuously and automatically while confirming the completion of the previous stroke using a detection switch. In particular, in the present invention, even if the device stops due to an overload or the like during the upward stroke after raking, or even after the electric circuit of the device is cut off by an emergency switch, if the device is energized, The previous ascent stroke is memorized in the electric circuit, and the rest of the ascent stroke is automatically carried out to complete the ascent stroke, so that garbage can be collected without any problems.

[Brief explanation of the drawing]

FIG. 1 is a perspective view mainly showing the mechanical parts of an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of the same, FIGS. 3 to 7 are views sequentially showing the operation of the device shown in FIG. 9 is a diagram showing the arrangement of limit switches, FIG. 9 is a diagram showing a hydraulic circuit, and FIG. 10 is a diagram showing an electric circuit in a state corresponding to the arrangement of FIG. 8. 1...Vehicle body, 2...Tailgade, 2b...Sump,
4... Bracket, 5... Pivot pin, 6... Deflector, 8... Guide rail, 9... Slider, 10... Pivot pin, 11... Scraping panel, 15... Scraping cylinder device, 19... Vertical cylinder device, 21
... Push cylinder device, LS-1 to LS-9... Limit switch, 31, 39... Support member, 33a,
40a, 42...limit switch actuator, 33...
Bell crank lever, 32, 36...axis, 45...
Pump, 47, 48... 3-position electromagnetic switching valve, 57
…2-position solenoid switching valve, SOL1 to SOL5…Solenoid, CR1, CR2, CR3…Relay, CR4…
Short circuit relay, CR1'~CR4...Relay contacts,
KCR...keep relay, S...its set coil,
R...Reset coil, KCR', KCR''...Keep relay contact, PB...Push button switch, SW
1... Short circuit switch, SW2... Continuous operation changeover switch.

Claims (1)

[Claims] 1 A tailgate whose upper end is pivotally connected to the vehicle body adjacent to the vehicle body opening, and a tailgate which is suspended by a lateral pivot above the vehicle body opening at the boundary between the tailgate and the vehicle body opening and swings toward the inside of the tailgate. a panel-shaped deflector; a slider supported by the deflector so as to be slidable up and down along the tailgate side surface of the deflector; and a vertically movable cylinder device that slides the slider up and down with respect to the deflector; A pull-in panel is rotatably supported near the upper edge of the slider by a lateral pivot on the lower edge of the slider, and a telescoping panel has both ends pivoted to the tailgate side of the slider and the tailgate side of the slider panel. One end is pivotally connected to the lateral pivot between the slider and the scraping panel, and the other end is pivotally connected to the tailgate at a position far from the vehicle body opening, and is extendable and retractable, so that the scraping panel can be moved when extended. A pushing cylinder device that performs a deep pushing stroke by pushing, an electromagnetic switching valve provided between a hydraulic pressure source and a hydraulic conduit connected to both sides of the cylinder device to control the expansion and contraction operation of the pushing cylinder device, and a pushing cylinder device. and an electric circuit including an electromagnetic switching valve device installed between the hydraulic pressure source and the switching valve and a solenoid for switching the switching valve device to control the expansion and contraction of the switching valve and the vertical movement cylinder device. The electric circuit includes a switch that detects the completion of the reversal of the raking panel due to contraction of the raking cylinder device, and a solenoid that switches the switching valve device to contract the pushing cylinder device and perform a backward displacement in response to the detection operation of this switch. and a switch for detecting the completion of backward displacement, and an electrical connection including a solenoid for switching the switching valve device so as to extend the vertical cylinder device and perform the downward displacement in response to the detection operation of the switch. and an electric connection including a switch for detecting the completion of the downward displacement, a solenoid for switching the switching valve to extend the scraping cylinder device to perform scraping in response to the detection operation of this switch, and a scraping panel to control the scraping. Switch LS-8 that detects completion,
A switch LS-9 detects the completion of the upward displacement by the vertically moving cylinder device, and the switching valve device is configured to contract the vertically moving cylinder device to perform the upward displacement in response to the detection operation of the switch that detects the completion of raking. and electrical means for acting on the solenoid to switch the solenoid, and switching the switching valve device to extend the pushing cylinder device and perform a deep pushing process in response to a detection operation of the switch that detects completion of upward displacement. It has a circuit part that has an electric means that acts on the solenoid, and a set coil S that is connected in series with the switch LS-8 that detects the completion of raking, and also detects the completion of upward displacement by the vertical movement cylinder device. a keep relay KCR having a reset coil R connected in series with the switch LS-9, and a contact KCR' of the keep relay that closes when the set coil is energized;
KCR'', and this keep relay contact is activated by the excitation of the set coil in conjunction with the detection operation of the switch LS-8 that detects the completion of raking.
the electrical means for switching the switching valve device so as to contract the vertically moving cylinder device to perform upward displacement;
The switch LS-8 detects the completion of scraping.
Regardless of the subsequent state of the keep relay, the reset coil of the keep relay remains closed until it is energized by the detection operation of the switch LS-9 that detects the completion of the upward displacement by the vertical movement cylinder device. Garbage loading device for garbage collection vehicles.