JPH0380683B2 - - 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 a garbage loading device for a garbage collection vehicle, a deflector is swingably supported inside the tailgate, and a scraping panel is pivotally attached to the lower end of a slider that slides up and down along the deflector. There is something like that. In this type of garbage loading device, the raking panels, etc. do not have a fixed shaft, so if they are left stationary, oil leakage from the valves and hydraulic cylinders may cause the raking panels, etc., to hit the tailgate or cargo box. The relative relationship deviates from the normal position. This deviation is particularly likely to occur in connection with a vertically moving cylinder device that is strongly influenced by gravity.

[Problem to be solved by the invention] If such a shift occurs, especially at the start of work or during loading work due to movement between long-distance garbage stations, the scraping panel may interfere with the floor surface, or the entire Problems such as disruption of the garbage collection cycle occur.

In view of the above points, the present invention provides an operation control circuit that allows the scraping panel, etc. to self-correct to its normal position by inputting a cycle start signal at startup even if the above-mentioned deviation occurs. prepared,
The present invention provides a garbage loading device for a garbage collection vehicle.

[Means for Solving the Problems] In order to achieve the above object, a garbage loading device for a garbage collection vehicle according to the present invention includes a tailgate whose upper end is pivotally connected to the vehicle body adjacent to the vehicle body opening; A panel-shaped deflector is suspended above the vehicle body opening by a horizontal pivot at the boundary between the tailgate and the vehicle body opening and is swingable toward the inside of the tailgate; A panel-shaped slider slidably supported by a deflector via a guide rail, a vertically moving cylinder device that slides the slider up and down with respect to the deflector, and a slider that is rotated by a lateral pivot at the lower end edge of the slider. A scraping panel freely supported near the upper edge, a telescopic scraping cylinder device for swinging the scraping panel, one end pivoted to the slider and the scraping panel, and the other end to the tailgate and the vehicle body opening. a telescoping cylinder device pivotally mounted at a position remote from the raking cylinder; a solenoid for actuating the raking cylinder device to reverse the raking panel; and a solenoid for actuating the raking cylinder device to rak the raking panel; A solenoid that operates a vertical cylinder device to move the slider and the scraping panel downward; a solenoid that operates the vertical cylinder device to move the slider and the scraping panel upward; and a solenoid that operates the vertical cylinder device to move the slider and the scraping panel upward; a solenoid for operating the pushing cylinder device to perform the displacement; a limit switch for detecting the limit position of the upward displacement of the slider and the scraping panel; A contact that is inserted into a circuit of a solenoid and closes the circuit of the solenoid when the limit switch does not detect the limit position, thereby displacing the slider and the scraping panel upward until the limit position is reached, and a scraping cylinder device configured to perform reversal. A contact is inserted into the circuit of the solenoid to be activated and interlocked with the contact so as to close the circuit of the solenoid and reverse the operation of the scraping panel only when the limit position of the limit switch is detected. It is something.

[Operation] According to the present invention configured as described above, if activation is started when the vertical movement cylinder device is extended during non-operation and has not fully contracted to a predetermined position, the limit of the upward displacement of the slider and the scraping panel is Since the limit switch that detects the position is open, the contact inserted into the circuit of the solenoid that operates the vertical cylinder device to perform the upward displacement of the slider and scraping panel is closed, thereby causing the slider and scraping panel to move upward. performs an upward displacement.

When the slider and the raking panel reach the limit position of upward displacement, the limit switch closes, thereby opening the contact point to stop the upward displacement of the slider and the raking panel, and simultaneously reverse the raking cylinder. Contacts inserted into the circuit of the solenoid that actuate the device can be closed to effect the reversing action of the scraping panel.

Embodiments of the present invention will be described below 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 that face each other in the horizontal direction, a sump 2b that constitutes a bottom plate that connects the side plates, and beams 2 _c1 , 2 _c2 , 2 _{c3 ,} 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 a scraping panel 11 is pivotally attached to the lower side of the slider 9 by a pivot 10 . A mounting lug 12 is fixed to the tailgate 2 side surface of this scraping panel 11, and a mounting lug 13 is also fixed to the upper part of the tailgate side surface of the slider 9. The upper end of the cylinder 15a is pivotally connected to the ear piece 13 by a pin 16. 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 pivot 10. The vertically moving cylinder device 19 is housed inside the slider 9, for example inside its side frame 9b (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 pivoted on the pivot 10. The pin 22 is mounted on a mounting bracket 23 fixed to the beam _2c2 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 connected 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 force to rotate counterclockwise around the pivot shaft 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, unlike when the scraping panel is reversed inside the tailgate, the dust inside the tailgate is not blown away when the tailgate 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. In other words, the scraping panel 11 is aligned with the pivot 10 as shown by arrow D in FIG.
The tip portion 11a rotates around the sump 2b so as to be displaced along the upper surface of the sump 2b, thereby reaching the position shown in FIG. 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, in order to sequentially operate the pushing cylinder device 15, the pushing cylinder device 21, and the vertical movement cylinder device 19, according to the present invention, a hydraulic circuit and an electric circuit, which will be explained from now on, are used. The various limit switches inserted therein will first be described with reference to FIG.

In the same figure, LS-1 is a limit switch that closes when the pushing cylinder device 21 is extended and the deflector 6 is in a state where pushing is completed.
It is 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 the limit switch LS-1. 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 limit switch LS-1 and closes its contact.

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 switch LS-1.
When the deflector 6 is completely rotated to the right, the actuator 33
a is further displaced and contacts the other limit switch LS-5 supported on the support member 31, closing its contact.

On the other hand, a support member 39 is also fixed to the slider 9, and limit switches LS-4 and LS-8 are supported on this. 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, actuator 40a contacts limit switch LS-8 and closes its normally open contact.
On the other hand, the scraping panel 11 is
When the actuator rotates counterclockwise around 0 and reaches the reversal completion position, the bending angle of the doglegged link mechanism 40 becomes smaller and the actuator 40a is displaced upward to act on the limit switch LS-4. This closes the normally open contact of limit switch LS-4.

At the top of deflector 6 is a limit switch LS.
-9, and at the bottom is the limit switch LS.
-6 is supported. Reference numeral 42 denotes an actuator fixed to the cylinder of the scraping cylinder device 15, which acts on the limit switches LS-6 and LS-9. In the state shown in FIG. 8 in which the vertical movement cylinder device 19 is contracted, the actuator 42 is activated by the limit switch LS-
9 and closes its normally open contacts. On the other hand, at the position where the vertically moving cylinder device 19 is extended and the slider 9 is completely lowered, the actuator 42 also lowers and acts on the limit switch LS-6. Limit switch LS-6 has its contacts 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.

Pipes 49 and 50 exit from the switching valve 47 and are connected to boats 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, respectively.

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 of the solenoids SOL1 to SOL5 and all of the limit switches LS-1 to LS-9 of the aforementioned switching valve. In FIG. 10, CR1 to CR8 represent relays, TDR1 and TDR2 represent time delay relays, and KR1 and KR2 represent keep relays, respectively.

Next, the operation of the control device consisting of the hydraulic circuit described above and the electric circuit shown in FIG. 10 will be explained.

At the start of operation, which is initiated by reversing the scraping panel 11 from the state shown in FIG. 2 to the state shown in FIG. 3, first close the main switch MSW shown in FIG. 10, and then press the push button switch PB. As a result, relays CR1 and CR2 are energized, and the relays
Contacts CR1', CR1'', CR1 of CR1 close, and contacts CR2', CR2'' of relay CR2 close. At this time, the ascent completion limit switch LS−
9 is closed, relay CR7 is energized, and its relay contact CR7' is closed, so the closed contacts CR1', KR2'', CR8', CR3', CR
The reversing solenoid SOL1 is energized via 7'. On the other hand, when the contact CR1'' closes, the rotary solenoid RSOL is energized, thereby adjusting the throttle lever of the engine, increasing the engine speed and increasing the discharge amount of the pump 45.

By energizing the solenoid SOL1, the switching valve 47 is switched to the left in FIG.
5 is supplied to the lower cylinder space, and the cylinder device 15 contracts. 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 switch LS-4 moves to the actuator 4.
Operated by 0a. That is, the reversal completion limit switch LS-4 is closed, relay CR3 is energized, relay contact CR3' is opened, and relay contact CR3' is opened.
CR3″ is closed. Therefore, the reversing solenoid
The excitation of SOL1 is cut off and the solenoid SOL3 is turned off.
is excited, and in FIG. 9, the switching valve 47 returns to the neutral position and the supply of pressure oil to the scraping cylinder device 15 is stopped, the switching valve 48 moves to the left, and the pressure oil flows through the pipe 5.
4. The air is sent to the left cylinder space of the pushing cylinder device 21 via the pilot check valve 55, and the cylinder device 21 contracts. Therefore, all the members are displaced backward toward the complete retreat position shown in FIG. 4.

When the deflector 6 begins to rotate from the reversal completion position shown in FIG. 3 to the retraction completion position shown in FIG. 4, the closed limit switch LS-1 opens. on the other hand,
Even if the pushbutton switch PB is turned off, the self-holding circuit of relay CR1 will continue to hold the self-holding relay CR.
This is established through the second contact CR2'. Note that at the same time that pressure oil is supplied to the left cylinder space of the pushing cylinder device 21, the vertical movement cylinder device 1
The upper cylinder space 9 also communicates with the pressure oil source, but since its pressure oil return line 59 is closed by the switching valve 57, the vertically movable cylinder device 19 does not move.

When the member reaches the retraction completion position shown in FIG. 4, the retraction completion limit switch LS-5 is activated by the actuator 33a.
is pressed to close, relay CR5 is energized, its contact CR5' closes, and contact CR5'' opens.
By closing contact CR5', the solenoid
SOL5 is energized, while solenoid SOL3 continues to be energized via relay contact CR3'' since limit switch LS-4 is activated and closed. Due to the energization of solenoid SOL5, switching valve 57 is activated as shown in FIG. Therefore, the lower cylinder space of the vertically movable cylinder device 19 communicates with the oil retainer via the pipe line 59, the switching valve 57, and the pipe line 53, so that the cylinder space above it is switched to the left side. The vertically moving cylinder device 19 extends downward due to the hydraulic pressure that continues to act.
Since the conduit 58 is closed by switching 7, the push cylinder device 21 does not move. Thus, all the members are displaced from the fully retracted state shown in FIG. 4 to the fully lowered state shown in FIG.

By reaching the lowering completion position shown in FIG.
Touch LS-6 to activate it. Limit switch LS-6 closes when actuated by actuator 42, energizing relay CR8, which opens relay contact CR8' and relay contacts CR8'', CR
8 closes. Therefore, solenoid SOL3
Then, the excitation of the solenoid SOL5 is cut off, the switching valve 57 moves to the right and closes the conduit 59, thereby stopping the downward extension of the vertical movement cylinder device 19, and at the same time, the scraping 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 raking cylinder device 15 extends downward, and raking is performed from the lowered state shown in FIG. 5 to the raked completed state shown in FIG.

When the scraping panel 11 reaches the scraping completion state shown in FIG. 6, the scraping completion limit switch LS-8 is closed by the action of the actuator 40a. Therefore, relay CR4 is energized and relay contact CR4'
closes. At this time, since relay contact CR8 is closed, the set side S of keep relay KR1 for rising memory is energized, and keep relay contacts KR1',
KR1″ closes respectively.Keep relay contact KR
When 1' is closed, the push-memory keep relay KR
The set side S of 2 is energized and the keep relay contact
KR2' closes and keep relay contact KR2'' opens.
By closing the keep relay contact KR2',
Solenoid SOL4 is energized. On the other hand, the solenoid SOL5 is connected through the closed keep relay contact KR2' and the closed keep relay contact KR1''.
is excited. In this way, solenoid SOL4,
By energizing SOL5, the switching valve 48
is switched to the right and the switching valve 57 is switched to the left, so the pressure oil is transferred from the pump 45 to the switching valve 48,
57 into the cylinder space below the vertically movable cylinder device 19, the cylinder device 19 begins to contract upward, and all the members begin to move toward the raised state shown in FIG. 7.

When the lift completion state shown in Fig. 7 is reached, the actuator 42 acts on the limit switch LS-9 and its contact closes, so that the relay CR7 is energized, the relay contact CR7' closes, and the relay contact CR7'' opens. , and relay contact CR7 closes.In this case,
Since relay contact KR2'' is open, opening and closing of relay contacts CR7' and CR7'' has no particular effect on the operation, but by closing relay contact CR7,
An input is input to the reset side R of the rising memory keep relay KR1, and the keep relay KR1 is reset. Therefore, keep relay contacts KR1', KR
1'' opens, and the excitation of solenoid SOL5 is cut off due to the opening of contact KR1''. However, even if the upward memory keep relay contact KR1' opens, the push memory keep relay KR2 is not reset, so the keep relay contact KR2' remains closed and the solenoid SOL4 continues to be energized. Therefore, only the switching valve 57 returns to the position shown in FIG. Pressure oil is sent into the right cylinder space of the device 21 through the switching valve 57, and the pushing cylinder device 21 begins to extend, and deep pushing begins from the lifted state shown in FIG. 7 to the pushed state shown in FIG. 2.

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.
LS-1 is closed under the action of actuator 33a.
Therefore, relay CR6 is energized, relay contact CR6 is closed, and push memory keep relay KR
The input is sent to the reset side R of 2, and the keep relay
KR2 is reset. For this reason, keep relay contact KR2' opens and solenoid SOL4 is de-energized.At the same time, contact CR6', which constitutes the self-holding circuit of relay CR1, opens, so the relay
CR1 is demagnetized, the entire process 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.

Assume that in the pushing stroke after the completion of the ascent during the cycle described above, the load due to dust is too large and the pushing speed by the pushing cylinder device 21 slows down. In this case, the operator looks at the situation and presses the individual return button R in the direction of the arrow. This energizes the solenoid SOL3 via the circuit 60, and pressurized oil enters the push cylinder arrangement 21 via the line 54 and the pilot check valve 55, deflating it, so that the deflector 6 and the scraping panel 11 are retracted. At the same time, the circuit of the rotary solenoid RSOL for controlling the rotation of the engine of the garbage collection vehicle is also connected to the power source via the circuit 61. This retraction is stopped when the operator releases the individual return button R. Note that by pressing the individual return button R, the circuit 62 is cut off from the power supply, so that the self-holding circuit of the relays CR1 and CR2 disappears. Therefore, the contacts that were closed
Since the solenoid SOL4, which has been energized via CR1' and the closed KR2', is deenergized prior to the energization of the solenoid SOL3, switching of the switching valve 48 is performed without any problem.

When the individual return button R is released, the circuit 60 is cut off, so that the excitation of the solenoid SOL3 is cut off and the circuit 61 is also cut off at the same time. Next, when pushbutton PB is pressed again, relays CR1 and CR2 are energized, and the aforementioned push memory keep relay is energized.
Solenoid SOL4 passes through keep relay contact KR2', which is closed because the memory of KR2 is not erased.
is excited, the pushing cylinder device 21 is extended again, and pushing is resumed.

The above-mentioned retraction of the deflector 6 and the scraping panel 11 can be performed any number of times by the operator pressing the individual return button R during the pushing process, unless the pushing completion state is reached. . As a result, during the pushing process, even under overload, the pushing process is repeated many times to strongly compress the garbage, thereby increasing the amount of garbage loaded. This is possible because the push-in memory keep relay KR2 stores the push-in stroke regardless of the interruption of the push-in stroke.

When the pushing process is repeated in this way and pushing is completed, limit switch LS-1 is closed, relay CR6 is energized, relay contact CR6 is closed, pushing memory keep relay KR2 is reset, and the solenoid The excitation of SOL4 is cut off, and at the same time, contact CR6' forming the self-holding circuit of relay CR1 is opened, so relay CR1 is demagnetized and the entire stroke is completed.

By the way, when the upward stroke is completed, the push cylinder device 21 is contracted, so the limit switch LS
-5 is in contact with the actuator 33a and is in a closed state.
Therefore, relay CR5 is in the energized state,
The relay contact CR5'' is open. However, at the moment when the push-in stroke starts after the completion of the upward stroke, the limit switch LS-5 is released from the actuator 33a and opens, so the excitation of the relay CR5 is cut off, and the relay contact CR5 ” closes. At this time, the relay contact
CR1 is closed and relay contact CR6''
Since relay CR6 is closed because it is not energized during pushing, time delay relay TDR2 is energized at the same time as relay contact CR5'' closes (at the same time as pushing starts).This time delay relay TDR2 is Contact TDR2′,
The contact TDR2' is opened and the contact TDR2'' is closed due to the time-up after the time delay relay TDR2 is energized. When contact TDR2'' closes and relay contact CR6'' is closed without completing pushing, contact CR6'',
An input is given to the reset side of the push-in memory keep relay KR2 through TDR2'', and the push-in memory is erased.Therefore, the push-in stroke is completed in the normal state after the push-in stroke starts, until the time delay relay TDR2 times up. By setting it to a certain length longer than the time it takes to complete the push-in process, if the push-in stroke is not completed easily due to overload, the push-in memory of the push-in memory keep relay KR2 will be erased after an appropriate amount of time by the action of the time delay relay TDR2. ,
The cycle is complete. Note that by opening the time delay relay contact TDR', the self-holding of the relay CR1 disappears, and the state before the start of the cycle is obtained.

According to the present invention, the following effect can be obtained when the downtime of the loading operation continues for a long time and the vertical movement cylinder device 19 is stretched due to the weight of the number of panels or oil leakage.

In the normal position with no such expansion, the vertical cylinder device 19 is fully retracted to a predetermined position at the completion of the loading cycle, so the actuator 42 closes the limit switch LS-9. but,
In the state where the expansion occurs, the vertical movement cylinder device 19 has not fully contracted to the predetermined position, so the limit switch LS-9 is open, and therefore the relay CR7 is also demagnetized. For this reason, even if push button switch PB is pressed to start the device in a state where the extension has occurred, relay CR7 is not energized, so its relay contact CR7' does not close, and relay contact CR7'' remains closed. Therefore, the solenoid SOL is connected via the circuit shown at 63 in Figure 10.
5 is energized, and the solenoid SOL4 is also energized via the circuit shown at 64. Therefore, pressure oil is sent to the lower cylinder space of the vertically movable cylinder device 19, the device 19 contracts, and the elongation that has occurred disappears. The limit switch is activated by the disappearance of this elongation.
Since LS-9 is closed, relay CR7 is energized, and mutually interlocked relay contacts CR7',
The former of CR7'' closes and the latter opens. Therefore, the excitation of solenoids SOL4 and SOL5 is cut off.
The contraction of the vertical cylinder device 19 stops, and at the same time, the solenoid SOL1 is energized via the contact CR7', so pressure oil is sent into the lower cylinder space of the scraping cylinder device 15, and the scraping panel 11 is reversed. Perform the action.

[Effects of the Invention] As described above, the present invention prevents the situation in which the vertically moving cylinder device stretches during non-operation due to the weight of panels or oil leakage, making it impossible to obtain proper operation at startup. I can do it. In other words, when the engine is started, the vertically moving cylinder device, which has been extended, first automatically performs the upward stroke, and after the upward movement is completed, the reverse stroke follows, which solves problems such as the scraping panel interfering with the floor surface. .

[Brief explanation of drawings]

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 shows the arrangement of limit switches, FIG. 9 shows the hydraulic circuit, and FIG. 10 shows the electric circuit. 1... Vehicle body, 2... Tailgate, 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 ... Pushing cylinder device, LS- 1~LS-9……Limit switch, 3
1, 39...Supporting member, 33a, 40a, 42...
... Limit switch actuator, 33 ... Bell crank lever, 32, 36 ... Pivot, 45 ... Pump, 47, 48 ... 3-position electromagnetic switching valve, 57 ...
...2-position solenoid switching valve, SOL1 to SOL5...Solenoid, KR1...Keep relay for rising memory,
KR2...Keep relay for push memory, CR1~
CR8...Relay, TDR1, TDR2...Time delay relay, R...Single return button, PB...
Pushbutton switch, CR7', CR7''...Interlocked relay contacts.

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 that can be moved; a panel-shaped slider that is supported by the deflector via a guide rail so as to be able to slide up and down along the tailgate side surface of the deflector; and a panel-shaped slider that can be slid up and down with respect to the deflector. a vertically movable cylinder device for moving the slider; 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 push-in cylinder device for swinging the push-in panel, and a telescopic push-in cylinder device whose one end is pivotally connected to the slider and the push-in panel, and the other end is pivoted to the tailgate at a position far from the vehicle body opening. a solenoid that operates a scraping cylinder device to reverse the scraping panel; a solenoid that operates the scraping cylinder device to scrape the scraping panel; and a vertical movement cylinder to move the slider and the scraping panel downward. a solenoid for activating the device; a solenoid for activating a vertical cylinder device for upward displacement of the slider and the raking panel; and a solenoid for activating the pushing cylinder device for retracting and pushing displacement of the deflector and the raking panel; A limit switch that detects the limit position of the upward displacement of the slider and the scraping panel, and a solenoid that operates the vertical movement cylinder device to perform the upward displacement of the slider and the scraping panel. a contact which, upon detection, closes the circuit of the solenoid to displace the slider and the raking panel upwardly until it reaches a limit position; and a contact which is inserted into the circuit of the solenoid which actuates the raking cylinder device to perform the reversal, and of the limit switch. A garbage loading device for a garbage collection vehicle, comprising a contact point interlocked with the contact point so as to close the circuit of the solenoid and perform a reversing operation of the scraping panel only when a limit position is detected.