JPH0634780U - Construction vehicle with floor cleaning device - Google Patents

Abstract

(57) [Summary] [Purpose] The floor cleaning device can be easily grounded without damage, and the space between the floor cleaning device and the floor can be maintained appropriately. [Structure] Lift arm 2 and tilt link 3 of vehicle 50
The quick coupler frame 4 is attached to the tip of the floor coupler, and the floor cleaning device 10 is pivotally supported by the quick coupler pins 11 on the left and right sides of the quick coupler frame 4 so as to be rotatable back and forth. The quick coupler frame 4 is provided with a hook receiving shaft 13, and the floor cleaning device 10 is provided with a hook 12 that engages with the hook receiving shaft 13 and restricts forward and backward tilting of a predetermined angle or more. A one-way throttle valve is provided in the hydraulic circuit on the return side when the lift cylinder 7 descends to slowly descend the floor cleaning device 10 by its own weight to reduce the impact load at the time of grounding.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a construction vehicle equipped with a floor cleaning device as a working device.

[0002]

[Prior art]

 Generally, a construction vehicle such as a wheel loader is equipped with a working device such as a bucket, and is provided with a lift arm and a tilt link for tilting up and down during operations such as excavation, loading and transportation. When the floor cleaning device is attached to such a construction vehicle, the floor cleaning device has conventionally been directly connected to the ends of the lift arm and the tilt link. Therefore, unless the tilt cylinder for operating the tilt link is controlled to expand or contract, the inclination angle in the front-rear direction with respect to the lift arm of the floor cleaning device is the same (see Japanese Utility Model Laid-Open No. 61-54018).

The floor cleaning device is provided with a plurality of rotatable casters in the front and rear parts, and while the casters are pushed and pulled by the construction vehicle while being in contact with the floor, dust on the floor is converted into a dust box by a rotating brush. The collected garbage is collected by lifting the floor cleaning device with a lift arm, opening the dust box, and discharging it to a garbage dump. Also, for construction vehicles, the lowering speed of the lift arm is high so as not to hinder the efficiency of work such as excavation, loading, and transportation when a bucket is attached.

[0004]

[Problems to be solved by the device]

 However, in a conventional construction vehicle with a floor cleaning device, when the lift control lever is operated to lower the lift arm in order to ground the floor cleaning device, the operation of the lift arm causes the movement of the lift arm to connect to the vehicle. Since the rotary motion is centered on the end axis, the vertical movement amount of the casters mounted on the front part and the rear part of the floor cleaning device does not match. Therefore, when the floor cleaning device is about to touch the ground, the lowering of the lift arm is interrupted, the tilt control lever is operated to control the expansion and contraction of the tilt cylinder, and the casters in the front and rear parts are grounded at the same time to the front and rear of the lift arm of the floor cleaning device. The tilt angle to the direction must be adjusted. However, since it is difficult to visually check the height of all casters from the floor from the driver's seat, the operator repeatedly travels from the driver's seat to the floor cleaning device to see the caster floor. It was necessary to confirm the height from the surface or to arrange a guider, and the efficiency of the cleaning work that repeated lifting of the floor cleaning device and grounding operation was poor.

Further, if the lift control lever is continuously operated even after the floor cleaning device is grounded, the hydraulic pressure in the lift cylinder suddenly rises, and the floor cleaning device is pressed against the floor surface with a high load so that the caster or the like is pressed. The operator must quickly switch the lift control lever at the same time as the grounding because it may cause damage to the equipment. In construction vehicles such as wheel loaders, the lift control lever is provided with a "float" position for various work equipment applications. At this "float" position, the hydraulic constraint of the lift cylinder is released by the control valve. It is like this. Therefore, when the floor cleaning device is grounded, the lift control lever can be operated to the “float” position and lowered by the weight of the floor cleaning device. In this case, the oil pressure does not press the floor surface after landing, but the descending speed due to its own weight is too high, and the floor cleaning device receives a large impact load at the time of grounding, and the casters may be damaged. .

In addition, during the cleaning work, the casters before and after the floor cleaning device are always grounded, the bristle tips of the rotating brush are appropriately pressed against the floor, and the space between the dust box and the floor is properly maintained. However, the floor surface to be cleaned is not always constant, but includes refraction surfaces and uneven surfaces due to changes in inclination. In conventional construction vehicles equipped with a floor surface cleaning device, the lift control lever must be held at the “float” position. Although it is possible to follow the changes in the height of the floor surface, the caster in either the front or back may float because the inclination angle of the floor cleaning device in the front-rear direction with respect to the lift arm is fixed. It is said that sufficient cleaning ability cannot be exerted due to excessive or insufficient pressing of the brush tip of the rotating brush against the floor surface, or an excessive gap between the dust box and the floor surface, resulting in unswept residue. There was a problem.

The present invention solves such a problem in a construction vehicle equipped with a floor cleaning device. The floor cleaning device can be easily grounded without being damaged, and the shape of the cleaning floor can be changed. Correspondingly, it is an object of the present invention to provide a construction vehicle with a floor surface cleaning device, which can maintain an appropriate gap with the floor surface at all times and has high efficiency and high cleaning ability.

[0008]

[Means for Solving the Problems]

 The present invention is a construction vehicle equipped with a lift arm and a tilt link for a working device, in which a quick coupler frame is attached to the tips of the lift arm and the tilt link, and the floor is attached to the left and right sides of the quick coupler frame with quick coupler pins. The above problem is solved by pivotally supporting the surface cleaning device so that the surface cleaning device can be rotated back and forth.

Further, the hook coupler is provided on the quick coupler frame, and the floor cleaning device is provided with a hook that engages with the hook retainer and restricts forward and backward tilting of a predetermined angle or more, thereby cleaning the floor. It is possible to prevent an excessive change in the tilt angle in the front-rear direction when the device is moved up and down. Furthermore, by providing a one-way throttle valve in the return side hydraulic circuit when the lift cylinder for lowering and raising the lift arm descends, the lift control lever is operated to the “float” position when the floor cleaning device is grounded. Even if the surface cleaning device is lowered by its own weight, the descending speed does not become excessively high, and it is possible to prevent the casters and the like from being damaged by the impact load at the time of grounding.

[0010]

[Action]

 When the floor cleaning device is lifted above the floor surface by the lift arm, the floor cleaning device can rotate back and forth around the quick coupler frame with the quick coupler pin as an axis. ing. When the operator operates the lift control lever to lower the lift arm, the casters in the front part of the floor cleaning device are first grounded. When the lowering of the lift arm is continued, the floor cleaning device, which was tilted forward, rotates and becomes parallel to the floor surface, and the casters at the rear contact the ground. When the floor cleaning device is about to touch the ground, suspend the lowering of the lift arm, operate the tilt control lever to control the expansion and contraction of the tilt cylinder, and make sure that the front and rear casters are grounded at the same time. It is not necessary to precisely adjust the angle of inclination to the direction.

If a hook for controlling the forward and backward tilt is provided, the forward tilt becomes a predetermined restriction angle. Therefore, the operator operates the tilt control lever to slightly move the floor cleaning device before the caster at the front portion comes into contact with the ground. By leaning forward, it is possible to shorten the time from the grounding of the front caster to the rotation of the floor cleaning device and the grounding of the rear caster, thus improving the work efficiency.

If a one-way throttle valve is provided in the return side hydraulic circuit when the lift cylinder for lowering and raising the lift arm is lowered, the operator operates the lift control lever to the “float” position to clean the floor surface. The equipment descends at a safe speed due to its own weight and does not receive an impact load at the time of touchdown. Also, at this time, the lift cylinder is in the state in which the hydraulic pressure is released, so the lift control lever does not have to be stopped to operate the floor. The surface cleaning device does not need to be hydraulically pressed against the floor surface, which facilitates operation.

The floor cleaning device is pushed and pulled by the construction vehicle to perform a floor cleaning operation in a state where the casters at the front and rear parts are both grounded. At this time, the operator operates the lift control lever to the “float” position, so that the lift arm freely rotates about the base end pivot that connects to the vehicle, and thus the floor cleaning device can maintain the height of the floor. In addition, the floor cleaning device is attached to the quick coupler frame so that it can be rotated back and forth, so it can be tilted freely following changes in the slope of the floor to be cleaned and unevenness. During the cleaning work, the casters before and after the floor cleaning device are always grounded, the tips of the rotating brush are properly pressed against the floor surface, and the dust box and the floor surface are properly maintained.

After collecting a certain amount of dust on the floor surface in the dust box, lift the floor cleaning device with a lift arm to open the dust box, discharge the collected dust to a garbage dump, etc., and then load the floor cleaning device again. Lower and repeat the above operation.

[0015]

【Example】

 1 is a side view of a wheel loader with a floor cleaning device according to an embodiment of the present invention, FIG. 2 is a hydraulic circuit diagram of a lift cylinder and a tilt cylinder, and FIGS. 3 and 4 are operation of a wheel loader with a floor cleaning device. It is explanatory drawing which shows a state. This wheel loader 1 with a floor cleaning device is provided with a lift arm 2 and a tilt link 3 in front of a vehicle 50 having a driver's seat 40 at the rear, which is normally equipped with a working device such as a bucket. The lift arm 2 has its base end pivotally supported by the vehicle 50 by an arm pivot 8 and is lifted and lowered by a lift cylinder 7 provided between the lift arm 2 and the vehicle 50. The tilt link 3 is pivotally attached to the lift arm 2 by a link pivot 32, and the tilt cylinder 9 provided between the tilt link 3 and the lift arm 2 tilts the work device. A quick coupler frame 4 is attached to the tip ends of the lift arm 2 and the tilt link 3 by a coupler pivot shaft 5 and a tilt shaft 6. A hook receiving shaft 13 is provided at the upper end of the quick coupler frame 4, a floor cleaning device 10 is pivotally supported by a quick coupler pin 11 at the lower part, and a stopper 14 is provided at the lower end. It is provided.

The floor cleaning device 10 is provided with a dust box 26 at a front portion, a brush frame 27 at a rear portion thereof, a rotatable front caster 21 at a front end portion and a rear end portion, a rear caster 22, and a hook 12 at a rear upper end portion. The hook 12 is engaged with the hook receiving shaft 13 so as to restrict the forward and backward tilting beyond a predetermined angle. Further, below the quick coupler pin 11, there is provided a stopper 34 that abuts the stopper 14 on the side of the quick coupler frame 4 when the floor cleaning device 10 tilts forward. The brush frame 27 is a housing in which the lower surface and the front surface are open, and the rotating brush 29 is supported by the brush shaft 30. The dust box 26 is a box whose rear surface is open, and the dust D on the floor surface F swept forward by the rotation of the rotating brush 29 is input and collected. The brush frame 27 and the dust box 26 are connected by an opening / closing shaft 28, and the joint surface 35 is opened / closed by an opening / closing cylinder 31 provided between the brush frame 27 and the dust box 26. .

As shown in FIG. 2, the lift cylinder 7 and the tilt cylinder 9 are connected to a hydraulic pump 36 and an oil tank 37 via a lift control valve 16 and a tilt control valve 17, respectively. Further, a one-way throttle valve 18 is provided between the bottom side oil chamber 38 of the lift cylinder 7 and the lift control valve 16. The tilt control valve 17 is a three-position manual operation switching valve, and by operating the tilt control lever 20, the quick coupler frame 4 can be tilted back and forth.

The lift control valve 16 is a four-position manual operation switching valve, and by operating the lift control lever 15 to the “up” and “down” positions, the lift arm 2 can be moved up and down. By operating the control lever 15 to the “float” position, the bottom side oil chamber 38 and the rod side oil chamber 39 of the lift cylinder 7 communicate with the oil tank 37, and the hydraulic pressure restraint is released. The one-way throttle valve 18 is a two-position manually operated switching valve, and when the switching lever 25 is operated to the "slow" position in which the throttle 19 and the check valve 24 are arranged in parallel, the one-way throttle valve 18 is lowered. That is, when the lift cylinder 7 is contracted, the flow rate of the working oil returning from the bottom side oil chamber 38 to the oil tank 37 is reduced, so that the lift arm 2 can be lowered slowly.

As shown in FIG. 3, when the floor cleaning device 10 is lifted above the floor surface by the lift arm 2, the floor cleaning device 10 attaches the quick coupler pin 11 to the quick coupler frame 4. As the shaft rotates forward due to its own weight, the hook 12 engages with the hook receiving shaft 13, and the stopper 14 on the side of the quick coupler frame 4 and the stopper 34 on the side of the floor cleaning device 10 are in contact with each other and are in a forward tilted state. Supported by.

When the operator lowers the floor cleaning device 10, when the lift control lever 15 is operated to the “float” position and the switching lever 25 is operated to the “slow” position, the lift arm 2 is slowly moved down. . If the tilt control lever 20 is once operated before the touchdown to bring it to the proper forward tilted state as shown in FIG. 4, the floor cleaning device 10 descends at a safe speed by its own weight, and the front caster 21 is grounded first. When the descent is further continued, the floor cleaning device 10 which is tilted forward becomes parallel to the floor and the rear casters 22 are grounded, so the descent is stopped. In this embodiment, a tilt confirmation plate 23, which serves as a guide for the forward tilt angle at the time of contact with the ground, is provided above the floor cleaning device 10 so that the operator can keep the tilt control lever 20 while sitting in the driver's seat 40. Can be easily operated.

The floor surface cleaning device 10 is pushed and pulled by the vehicle 50 to clean the floor surface F with both the front casters 21 and the rear casters 22 grounded. At this time, when the operator operates the lift control lever 15 to the “float” position, the lift arm 2 freely rotates around the arm pivot 8 connecting with the vehicle 50. Since the floor cleaning device 10 is mounted on the quick coupler frame 4 so that it can be rotated back and forth, it can respond to changes in the height of F. The brush tip of the rotating brush 29 is appropriately pressed against the floor surface F during the cleaning work to properly maintain the distance between the dust box 26 and the floor surface F.

When a predetermined amount of dust D on the floor surface F is collected in the dust box 26, the lift control lever 15 is operated to the “up” position and the floor cleaning device 10 is lifted by the lift arm 2. At this time, even if the switching lever 25 is not operated, pressure oil is supplied from the hydraulic pump 36 to the bottom side oil chamber 38 of the lift cylinder 7 through the check valve 24 of the one-way throttle valve 18. 10 can be raised at high speed.

In the lifted floor cleaning device 10, the opening / closing cylinder 31 is contracted to open the dust box 26, and the collected dust D is discharged to a garbage disposal site, and then the floor cleaning device 10 is lowered again to perform the above operation. Repeat the operation. When the floor cleaning device 10 is detached and another work device such as a bucket is attached to perform work such as excavation, loading and transportation, the hook 12 is engaged with the hook receiving shaft 13 and the quick coupler frame is used. If the stopper 14 on the No. 4 side and the stopper 34 on the floor cleaning device 10 side are in contact with each other, the quick coupler pin 11 can be easily pulled out. The same state can be applied when reattaching. When performing work such as excavation, loading, and transportation, the one-way throttle valve 18 can be fixed at the "high speed" position by operating the switching lever 25.

[0024]

[Effect of device]

 As described above, in the construction vehicle with the floor cleaning device of the present invention, the operator repeatedly visits from the driver's seat to the floor cleaning device side to check the height of the casters from the floor surface, There is no need for a guider, the floor cleaning device can be easily grounded without damaging it, and the space between the floor cleaning device and the floor surface can be maintained appropriately in response to changes in the floor shape. It has a high efficiency and a high cleaning ability.

[Brief description of drawings]

FIG. 1 is a side view of a wheel loader with a floor cleaning device according to an embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram of a lift cylinder and a tilt cylinder.

FIG. 3 is an explanatory diagram showing an operating state of a wheel loader with a floor cleaning device.

FIG. 4 is an explanatory diagram showing an operating state of a wheel loader with a floor cleaning device.

[Explanation of symbols]

 1 Wheel loader with floor cleaning device 2 Lift arm 3 Tilt link 4 Quick coupler frame 7 Lift cylinder 9 Tilt cylinder 10 Floor cleaning device 11 Quick coupler pin 12 Hook 13 Hook bearing shaft 15 Lift control lever 16 Lift control valve 17 Tilt control Valve 18 One-way throttle valve 19 Throttle 20 Tilt control lever 21 Front caster 22 Rear caster 25 Switching lever 26 Dust box 27 Brush frame 29 Rotating brush 31 Opening / closing cylinder

Claims (3)

[Scope of utility model registration request] 1. A construction vehicle including a lift arm and a tilt link for a working device, wherein a quick coupler frame is attached to the tip of the lift arm and the tilt link, and a floor surface is provided with quick coupler pins on both left and right sides of the quick coupler frame. A construction vehicle with a floor cleaning device, characterized in that a cleaning device is pivotally supported so as to be rotatable back and forth. 2. The quick coupler frame is provided with a hook receiving shaft, and the floor cleaning device is provided with a hook for engaging with the hook receiving shaft and restricting forward and backward tilting of a predetermined angle or more. A construction vehicle with a floor cleaning device according to 1. 3. The construction vehicle with a floor cleaning device according to claim 1, wherein a one-way throttle valve is provided in a return hydraulic circuit when the lift cylinder for raising and lowering the lift arm is lowered.