JP2019027244A - Road surface cleaning vehicle - Google Patents

Abstract

To provide a road surface cleaning vehicle which can simplify the structure relating to opening and closing of a discharge door of a hopper having a latch, resulting in reduction in cost.SOLUTION: There is provided a road surface cleaning vehicle configured such that: under a situation where an operation end is located at a second engagement position in the state where a discharge outlet is closed by a discharge door 10, when a hydraulic cylinder 15 is caused to perform contraction operation while latches 26, 26 are located at a lock position, the operation end moves to a first engagement position so that the latches 26, 26 move to an unlock position by means of a linkage mechanism 25 and the contraction operation of the hydraulic cylinder 15 from the first engagement position causes the discharge door 10 to perform opening operation; and under a situation where the operation end is located at the first engagement position in the state where the discharge outlet is opened by the discharge door 10, when the hydraulic cylinder 15 is operated to be extended while the latches 26, 26 are located at the unlock position, the operation end operates to close the discharge door 10 and then moves to the second engagement position against energization of discharge coil springs 22, 22, so that the latches 26, 26 move to the lock position by means of the linkage mechanism 25.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a road cleaning vehicle that includes a hopper that collects garbage and discharges the garbage collected by the hopper by lifting the front side of the hopper and opening a discharge door provided at the rear of the hopper.

  As exemplified in Patent Document 1, for example, the road surface cleaning vehicle includes a box-like hopper on a chassis, and collects garbage on the road surface collected by a brush and a pickup head in the hopper. At the rear of the hopper, there is a discharge door that opens and closes with a hydraulic cylinder, a latch that locks the discharge door, and a hydraulic cylinder that operates the latch. After releasing the lock, if the discharge door is opened and the front side of the hopper is lifted, dust can be discharged from the rear of the opened hopper.

Japanese Utility Model Publication 5-35138

  In the above conventional road cleaning vehicle, separate hydraulic cylinders are provided for the operation of the discharge door and the operation of the latch, and each hydraulic cylinder is controlled using a switching valve in the hydraulic circuit. Such a structure becomes complicated, leading to an increase in cost.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a road cleaning vehicle that can simplify a structure related to opening and closing of a discharge door of a hopper having a latch and can be made at low cost.

In order to achieve the above object, an invention according to claim 1 is provided with a hopper for collecting dust and the like on a chassis, and a discharge port for dust and the like at a rear portion of the hopper, and a discharge door capable of opening and closing the discharge port. And an actuator that opens and closes the discharge door by an expansion / contraction operation, and the discharge door is provided with a latch that locks the opening operation by locking the locked portion provided in the hopper when the discharge port is closed. A road sweeper,
The operation end of the actuator is connected to the discharge door, and the actuator is extended from the first lock position when the discharge door is closed and the first lock position when the discharge door is opened and closed when the actuator is extended and contracted. In addition, a guide portion that can move the operating end between the second locking position and a biasing unit that biases the operating end to the first locking position is provided. In the meantime, the latch is moved to the unlocking position where the latch is not locked to the locked portion at the first locking position of the operating end, and the latch is locked to the locked portion at the second locking position of the operating end. A linkage mechanism for moving to the lock position is provided,
When the discharge port is closed by the discharge door, the operating end is in the second locking position, and the actuator is contracted from the locked position, the operating end moves to the first locking position. Then, the latch moves to the unlocking position through the linkage mechanism, and the discharge door is opened by the contraction operation of the actuator from the first locking position, while the operation end is in the open state by the discharge door. When the actuator is extended from the state where it is in the first locking position and the latch is in the unlocking position, the operating end closes the discharge door and then the second end against the bias of the biasing means. By moving to the locking position, the latch moves to the locking position via the linkage mechanism.
According to a second aspect of the present invention, in the configuration of the first aspect, the biasing means is a coil spring.
According to a third aspect of the present invention, in the configuration of the first or second aspect, the linkage mechanism connects the linkage bar extending in the direction orthogonal to the moving direction of the operating end, the linkage bar and the operating end, and the movement of the operating end. And a linkage member that rotates the linkage bar, and the latch is connected to the linkage bar, and the latch rotates to the unlocked position and the locked position by the rotation of the linkage bar as the operating end moves. To do.
According to a fourth aspect of the present invention, in the configuration of the third aspect, the linking member is coupled by screwing both ends to the operating end side and the linking bar side, and the linking member is connected to the operating end side and the linking bar side. The angle of the latch can be adjusted by changing the rotation angle of the linkage bar by adjusting the screwing amount.
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the locked portion includes a roller.

According to the first aspect of the present invention, the opening / closing operation of the discharge door and the engagement / disengagement operation of the latch can be sequentially performed with one actuator by shifting the timing. Therefore, the structure relating to the opening and closing of the discharge door of the hopper having the latch can be simplified and the cost can be reduced.
According to the second aspect of the present invention, in addition to the effect of the first aspect, by adopting the coil spring as the biasing means, the operating end can be easily and reliably biased to the first locking position. it can.
According to the third aspect of the invention, in addition to the effect of the first or second aspect, by employing a linkage mechanism including a linkage bar and a linkage member, the latch is rotated in conjunction with the expansion / contraction operation of the actuator. It can be easily engaged with and disengaged from the locking portion.
According to the fourth aspect of the invention, in addition to the effect of the third aspect, the angle of the latch can be adjusted by adjusting the screwing amount of the linking member, so that the latch is reliably engaged with and disengaged from the locked portion. be able to.
According to the fifth aspect of the present invention, in addition to the effect of any one of the first to fourth aspects, the latched portion includes the roller, so that the latch is smoothly engaged and disengaged.

It is a side view of a road surface cleaning vehicle. It is a rear view of a road sweeper. It is an enlarged view of the rear lower part of the discharge door. It is an expanded sectional view of a latch part at the lower side of the discharge door (the latch is in the locked position). It is an expanded sectional view of the lower side of the side of the discharge door (the latch is in the locked position). It is an expanded sectional view of the side lower part center of a discharge door (a latch is a lock release position). It is a side view of the road surface cleaning vehicle which lifted up the hopper.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing an example of a road cleaning vehicle. The road cleaning vehicle 1 is provided with a box-like hopper 3 on the upper rear side of the chassis 2 (the right side in FIG. 1 is the front side). 2 is provided with a brush 4 at the front lower part and a pickup head 5 at the rear lower part so as to be movable up and down. 6 is a front wheel, 7 is a rear wheel, and the brush 4 and the pickup head 5 are in close contact with the road surface. collect. As shown by a two-dot chain line, the hopper 3 can lift up the front side with the rear end as a fulcrum by a lift mechanism (not shown).

  Further, the rear plate 3 a of the hopper 3 has an inclined surface that descends toward the rear, and a discharge port 9 formed on the lower side of the rear plate 3 a can be opened and closed by a discharge door 10. As shown in FIG. 2, the discharge door 10 is a horizontally long plate-like body whose left and right sides at the upper end are rotatably connected to the rear plate 3 a of the hopper 3 by hinges 11, 11. In the center in the left-right direction, as shown in FIGS. 3 to 5, a pair of left and right guide plates 12, 12 each provided with a long hole 13 parallel to the rear surface of the discharge door 10 are spaced at a predetermined interval. It stands up and down. On the other hand, a pair of left and right triangular fulcrum plates 14 and 14 whose front end portions protrude rearward are erected on the upper center side in the left-right direction of the rear plate 3a at a predetermined interval.

An end portion of a cylinder body 16 of a hydraulic cylinder 15 as an actuator is connected between the tip portions of the fulcrum plates 14 and 14 so as to be rotatable about the left and right direction. An operating end 18 provided at the tip of the piston rod 17 of the hydraulic cylinder 15 is disposed between the guide plates 12, 12, and is connected to the long hole 13 by a connecting shaft 19 in the left-right direction penetrating the long holes 13, 13. , 13 are connected so as to be movable.
Therefore, when the piston rod 17 of the hydraulic cylinder 15 contracts and the connecting shaft 19 integrated with the operating end 18 is locked to the upper ends of the long holes 13, 13, the discharge door 10 is lifted rearward around the hinges 11, 11. The exhaust port 9 can be opened by rotating upward as the piston rod 17 contracts.

  The connecting shaft 19 is formed with a length projecting at both ends to the left and right outer sides of the left and right guide plates 12, and upper ends 20 and 20 having openings at the upper and left and right outer sides are respectively connected to both ends. Yes. Below the upper receivers 20 and 20, lower receivers 21 and 21 are connected to the lower part of the discharge door 10, and upper and rear openings are respectively connected between the upper receiver 20 and the lower receiver 21. The coil springs 22 as biasing means are interposed in a compressed state. Further, a screw rod 23 that penetrates the coil spring 22 is provided between the upper receiver 20 and the lower receiver 21. The upper end of the screw rod 23 is fixed to the inner upper surface of the upper receiver 20, and the lower end penetrates the lower receiver 21. A nut 24 for retaining the screw rod 23 is screwed to the screw rod 23 below the lower receiver 21. Are combined.

On the other hand, a pair of left and right latches 26, 26 that can lock and unlock the opening operation of the discharge door 10 with the discharge port 9 closed are linked to the operation end 18 of the piston rod 17. A linkage mechanism 25 is provided for operation.
The linkage mechanism 25 serves as a linkage member that connects the linkage bar 27 extending in the left-right direction below the discharge door 10, the linkage bar 27 and the operating end 18, and rotates the linkage bar 27 as the operating end 18 moves. A linkage rod 28. The linkage bar 27 is rotatably supported by penetrating between the tips of the left and right brackets 29, 29 fixed downward to the lower end of the discharge door 10, and outside the brackets 29, 29 at both ends of the linkage bar 27. The base end of the L-shaped latch 26 in a side view is integrally connected. In the center of the link bar 27, a link piece 30 that protrudes rearward substantially orthogonal to the base end direction of the latch 26 is integrally provided.

The linkage rod 28 has screw portions at the upper and lower ends, and the upper end is connected to the operating end 18 via a U-shaped joint fitting 31, and the lower end is connected to the rear end of the linkage piece 30 via a pair of joint plates 32 and 32. Each is connected.
The joint metal 31 moves integrally with the operation end 18 by having upper ends located on both sides of the operation end 18 penetrating through the connecting shaft 19, and a through hole is formed in the lower center of the joint metal 31. An upper nut 33 is fixed to the lower surface of the lever, and a screw portion at the upper end of the linkage rod 28 is screwed to the upper nut 33.
The lower ends of the joint plates 32, 32 are connected to the rear end of the linkage piece 30 by a stop pin 34, and the upper ends of the joint plates 32, 32 are connected to each other outward, and a lower nut 35 is held therebetween. A thread portion at the lower end of the linkage rod 28 is screwed into the lower nut 35.

  In this way, the linkage rod 28 is installed between the operating end 18 and the linkage piece 30 of the linkage bar 27 via the joint fitting 31 and the joint plates 32, 32, and the linkage rod 28 is screwed into the upper nut 33 and the lower nut 35. By adjusting the amount, the angle of the linkage piece 30 can be adjusted, and the angles of the linkage bar 27 and the latch 26 integrated therewith can be adjusted. Reference numerals 36 and 36 denote fixing nuts that fix the adjustment position of the linkage rod 28 by being screwed to the linkage rod 28 adjacent to the upper nut 33 and the lower nut 35, respectively.

A locked portion 40 corresponding to the latches 26 and 26 of the discharge door 10 is provided on the lower surface of the rear portion of the hopper 3. The locked portion 40 is installed between a pair of support plates 41, 41 formed downward at positions where the latches 26, 26 are sandwiched from the left and right sides of the lower surface of the hopper 3, and the lower ends of the support plates 41, 41. The roller 42.
Therefore, when the latch 26 rotates counterclockwise around the connecting bar 27 in a side view, the leading end 26a of the latch 26 turns around the lower side of the roller 42 as shown in FIGS. The opening of the door 10 is locked (lock position).
On the other hand, when the latch 26 rotates to the right around the linkage bar 27 in a side view from this locked position, the tip 26a of the latch 26 moves away from the lower side of the roller 42 to unlock the discharge door 10 as shown in FIG. (Lock release position)

Here, in a first locking position where the connecting shaft 19 of the operating end 18 is locked to the upper ends of the long holes 13 and 13 of the guide plates 12 and 12 with the discharge door 10 closed, the connecting rod 28 is interposed. Since the linkage piece 30 is pulled upward, the linkage bar 27 rotates clockwise in FIGS. 4 and 5 to move the latches 26 and 26 to the unlocked position.
On the other hand, at the second locking position where the connecting shaft 19 of the operating end 18 is locked to the lower ends of the long holes 13, 13 of the guide plates 12, 12, the linkage piece 30 is pushed down via the linkage rod 28. Therefore, the linkage bar 27 rotates counterclockwise in FIG. 6 and moves the latches 26 and 26 to the lock position.

In the road cleaning vehicle 1 configured as described above, when the dust and the like on the road surface are collected by the brush 4 and the pickup head 5, the piston rod 17 of the hydraulic cylinder 15 has the operating end 18 at the second locking position. The latches 26 and 26 are maintained in a locked position for engaging the rollers 42 and 42.
When dust or the like collected in the hopper 3 is discharged from the discharge port 9 from here, when the piston rod 17 is contracted, the linkage piece 30 is pulled up via the linkage rod 28, so that the linkage bar 27 is moved to the right as described above. Rotate and rotate the latches 26, 26 to the right. When the operating end 18 reaches the first locking position, the latches 26 and 26 move to the unlocking position. During the movement of the operating end 18, the left and right upper receivers 20, 20 are pushed upward by the left and right coil springs 22, 22, so that the operating end 18 is surely raised and unlocked by the latches 26, 26.

If the piston rod 17 continues to contract as it is, the connecting shaft 19 locked to the upper ends of the long holes 13 and 13 of the guide plates 12 and 12 lifts the discharge door 10 upward through the guide plates 12 and 12, and the fulcrum plate 14. , 14 and the hydraulic cylinder 15 is also rotated upward, and the discharge door 10 is rotated upward about the hinges 11, 11. Therefore, the discharge port 9 is opened.
When the hopper 3 is lifted up in this state, as shown in FIG. 7, dust or the like in the hopper 3 falls backward from the discharge port 9 and is discharged.
When the discharge of dust or the like is completed, the hopper 3 is lifted down and the piston rod 17 is extended. Then, the discharge door 10 rotates downward about the hinges 11 and 11 to close the discharge port 9.
At this time, since the operating end 18 is biased to the first locking position of the long holes 13 and 13 by the coil springs 22 and 22, when the discharge door 10 is closed, the operating end 18 is accidentally moved to the first position. It does not move toward the two locking positions. Accordingly, the unlocked positions of the latches 26 and 26 are maintained.

When the piston rod 17 continues to extend after the discharge door 10 is closed in this way, the operating end 18 and the upper receiving plates 20 and 20 are lowered against the bias of the coil springs 22 and 22, and are linked via the linkage rod 28. The piece 30 is pushed down, the linkage bar 27 is rotated counterclockwise as described above, and the latches 26 and 26 are rotated counterclockwise.
When the operating end 18 reaches the second locking position, the latches 26 and 26 return to the locked position again, and are locked to the rollers 42 and 42 of the locked portions 40 and 40 to lock the discharge door 10. Will do.

Thus, in the road sweeper 1 of the said form, the operation | movement end 18 of the hydraulic cylinder 15 is connected with the discharge door 10, and the 1st latching position which opens and closes the discharge door 10 with the expansion-contraction operation | movement of the hydraulic cylinder 15 is carried out. And guide plates 12 and 12 in which the operating end 18 is movable between the first locking position and the second locking position in which the hydraulic cylinder 15 is extended from the first locking position when the discharge port 9 is closed. Coil springs 22 and 22 for urging the operating end 18 to the first locking position are provided, and between the operating end 18 and the latches 26 and 26, the latch 26, 26 is moved to a lock release position where it is not locked to the locked portion 40, and is moved to a lock position where the latches 26, 26 are locked to the locked portion 40 at the second locking position of the operating end 18. 25, a discharge port by the discharge door 10 When the hydraulic cylinder 15 is contracted from the state where the operating end 18 is in the second locking position and the latches 26 and 26 are in the locking position, the operating end 18 moves to the first locking position. As a result, the latches 26 and 26 are moved to the unlocking position via the linkage mechanism 25, and the discharge door 10 is opened by the contraction operation of the hydraulic cylinder 15 from the first locking position. When the hydraulic cylinder 15 is extended from the state in which the operating end 18 is in the first locking position and the latches 26 and 26 are in the unlocking position with the discharge port 9 in the open state, the operating end 18 opens the discharge door 10. After the closing operation, the latches 26 and 26 are moved to the lock position via the linkage mechanism 25 by moving to the second locking position against the bias of the coil springs 22 and 22. .
With this configuration, the opening / closing operation of the discharge door 10 and the engagement / disengagement operation of the latches 26 and 26 can be sequentially performed by one hydraulic cylinder 15 at different timings. Therefore, the structure related to opening and closing of the discharge door 10 of the hopper 3 having the latches 26 and 26 can be simplified, and the cost is reduced.

Particularly, since the urging means is the coil springs 22 and 22 here, the operating end 18 can be easily and reliably urged to the first locking position.
Further, the linkage mechanism 25 includes a linkage bar 27 extending in a direction orthogonal to the moving direction of the operating end 18, and a linkage rod 28 that connects the linkage bar 27 and the moving end 18 and rotates the linkage bar 27 as the operating end 18 moves. The latches 26 and 26 are coupled to the linkage bar 27, and the latches 26 and 26 are rotated and moved between the unlocking position and the locking position by the rotation of the linkage bar 27 accompanying the movement of the operating end 18. The latches 26 and 26 can be rotated in conjunction with the expansion and contraction of the hydraulic cylinder 15 to be easily engaged and disengaged from the locked portions 40 and 40.
Further, the linkage rod 28 is connected by screwing both ends to the upper nut 33 on the operating end 18 side and the lower nut 35 on the linkage bar 27 side, and the linkage rod 28 is screwed into the upper nut 33 and the lower nut 35. Since the angle of the latch 26 can be adjusted by changing the rotation angle of the linkage bar 27 by adjusting the amount, the latch 26 can be reliably engaged and disengaged with respect to the locked portion 40.
In addition, since the locked portion 40 includes the roller 42, the latch 26 is smoothly engaged and disengaged.

In the above embodiment, the coil springs are arranged on both the left and right sides of the operating end. However, the coil springs may be either left or right, and the operating end is set to the first locking position by covering one coil spring on the linkage rod. It may be energized. Further, the biasing means is not limited to the coil spring, and a damper, a gas spring, or the like can be employed.
In addition to the hydraulic cylinder, a pneumatic cylinder, a ball screw, or the like can be employed as the actuator. The linkage mechanism can be changed as appropriate, such as increasing or decreasing the number of latches and the shape of the latch, as well as a structure using a gear.
And in the said form, although the discharge door which used the upper end as the hinge is provided so that opening and closing is possible, the application of this invention is possible even when opening and closing in the left and right direction using the left and right ends as hinges.
In addition, the other structure of the road cleaning vehicle is not limited to the above-described form. For example, the present invention can be applied even if a dust collecting mechanism other than the pickup head is provided.

  1 ... Road cleaning truck 2 ... Chassis 3 ... Hopper 9 ... Discharge port 10 ... Discharge door 12 ... Guide plate 13 ... Long hole 15 ... Hydraulic cylinder 16 ... Cylinder body, 17 ... Piston rod, 18 ... Working end, 19 ... Connection shaft, 20 ... Upper support, 21 ... Lower support, 22 ... Coil spring, 25 ... Link mechanism, 26 ... Latch 27 .. Linking bar, 28.. Link rod, 30 .. Linking piece, 31 .. Joint fitting, 32 .. Joint plate, 40 .. Locked part, 42.

Claims (5)

A hopper that collects dust and the like is provided on the chassis, and a discharge port for dust and the like, a discharge door that can open and close the discharge port, and an actuator that opens and closes the discharge door by an extension operation On the other hand, on the discharge door, the road cleaning vehicle provided with a latch that locks the opening operation by locking the locked portion provided in the hopper in the closed state of the discharge port,
An operating end of the actuator is connected to the discharge door, and a first locking position that opens and closes the discharge door as the actuator expands and contracts, and the first locking position when the discharge port is closed. And a biasing means for biasing the operating end to the first locking position, and a guide portion that is movable between the operating end and a second locking position where the actuator is extended. Is provided,
The latch is moved between the operating end and the latch at the first locking position of the operating end to the unlocking position where the latch is not locked to the locked portion, and the second end of the operating end is moved. A linkage mechanism for moving the latch to the locked position for locking the latched portion at the locked position is provided,
When the discharge end is closed by the discharge door, when the operating end is in the second locking position and the latch is operated in a contracted state from the state in which the latch is in the locked position, the operating end is By moving to the first locking position, the latch moves to the unlocking position via the linkage mechanism, and the discharge door opens by the contraction operation of the actuator from the first locking position. on the other hand,
When the discharge end is opened by the discharge door and the operating end is in the first locking position and the latch is extended from the unlocked position, the operating end is After the discharge door is closed, the latch moves to the lock position via the linkage mechanism by moving to the second locking position against the bias of the biasing means. A featured road sweeper.   The road sweeper according to claim 1, wherein the biasing means is a coil spring.   The linkage mechanism includes a linkage bar extending in a direction orthogonal to the moving direction of the operating end, a linkage member that connects the linkage bar and the operating end, and rotates the linkage bar as the operating end moves, The latch is connected to the linkage bar, and the latch is rotated to the unlock position and the lock position by the rotation of the linkage bar accompanying the movement of the operation end. 2. A road cleaning vehicle according to 2.   The linking member is connected by screwing both ends to the operating end side and the linking bar side, and by adjusting the screwing amount of the linking member with respect to the operating end side and the linking bar side, The road cleaning vehicle according to claim 3, wherein the angle of the latch is adjustable by changing a rotation angle.   The road cleaning vehicle according to any one of claims 1 to 4, wherein the locked portion includes a roller.

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