JP7073026B1 - A cargo handling vehicle equipped with a door opening / closing structure for a bucket for a cargo handling vehicle and a door opening / closing structure. - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a door opening / closing structure for a cargo handling vehicle bucket capable of automatically opening / closing a bucket door at the time of loading and unloading without using an electric control device. SOLUTION: A door opening / closing structure 2 closes a bucket 7, a lower frame 6 connected to the bucket 7 via a first pivot shaft 8, an inclined portion 11 for lifting and tilting the bucket 7, and an opening. It is a door opening / closing structure of a bucket 7 for a cargo handling vehicle provided with a door 9. The door opening / closing structure 2 includes a roller 21, a lock portion 23 having a locking portion 230 and a lever 231 and an urging portion 25. When the bucket 7 is horizontal, the urging portion 25 swings the locking portion 230 upward by the urging force to lock the locking piece 230a to the lower edge of the door 9. When the bucket 7 is tilted, the lever 231 is pressed against the roller 21 and swings the locking portion 230 downward with the third pivot shaft 24 as a fulcrum. [Selection diagram] Fig. 2

Description

The present invention relates to a door opening / closing structure for a bucket for a cargo handling vehicle and a cargo handling vehicle having the door opening / closing structure.

An underground furnace is one of the types of furnaces that calcin limestone to produce quicklime. There is a floor hole provided in the floor as a charging port for this underground furnace, and the worker throws crushed limestone and coal into the floor hole. Traditionally, wheelbarrows have been used to transport this limestone and coal. However, from the viewpoint of work efficiency, it is preferable to use a cargo handling vehicle rather than human power.

Therefore, as a cargo handling vehicle for transporting such minerals, for example, there is a wheel loader described in Patent Document 1. This wheel loader is provided with a bucket for accommodating earth and sand, and the bucket is moved up and down and tilted by a bucket drive mechanism. In addition, this wheel loader can be equipped with various buckets by replacing the attachment. However, since the wheel loader is equipped with a cargo handling device for scooping earth and sand, there is a problem that the bucket is small compared to the size of the vehicle body, which is large. Further, the bucket mounted on the wheel loader usually does not have an opening for discharging the load or a door for opening and closing the opening when the load is discharged. Even if the bucket is provided with an opening and a door, manually opening and closing the door is dangerous and unfavorable. Further, it is not preferable to provide a control device for controlling the door and a hydraulic device for opening and closing the door, which leads to an increase in cost.

Japanese Unexamined Patent Publication No. 2020-165219

Therefore, the problem to be solved by the present invention is a door opening / closing structure for a cargo handling vehicle bucket that can automatically open / close the bucket door at the time of loading and unloading without using an electric control device, and the door opening / closing structure. The purpose is to provide a cargo handling vehicle with a structure.

In order to solve the above problems, the door opening / closing structure of the bucket for a cargo handling vehicle according to the present invention is
With the car body
A bucket with an opening on the other side of the car body,
A lower frame that extends from the vehicle body to support the bucket and is connected to the bucket via the first pivot shaft.
An inclined part that inclines the bucket in the opposite direction of the vehicle body with the first pivot axis as the fulcrum,
It is swingably connected to the bucket via the second pivot shaft, closes the bucket opening when the bucket is horizontal, and swings in the opposite direction of the vehicle body with the second pivot shaft as the fulcrum when the bucket is tilted. It is a door opening / closing structure for a cargo handling vehicle bucket equipped with a door that opens the opening of the bucket.
A pair of left and right arms provided on the lower frame and extending at a distance from the vehicle body from the first pivot axis,
A roller that extends to the left and right and is rotatably connected between a pair of left and right arms at a distance from the vehicle body from the first pivot shaft.
The bracket provided on the underside of the bucket and
The central part is swingably connected to the bracket via the third pivot shaft, and a locking piece that extends from the central part to one side and is locked to the lower edge of the door is provided. A lever that extends from the center to the other and is located above the roller, and when the bucket is tilted, it is pressed against the roller to swing the locking part downward and release the locking of the locking part. And, with a lock part,
When the bucket is horizontal, it is characterized by including an urging portion that swings the locking portion upward by an urging force and locks the door by a locking piece.

The door opening / closing structure is preferably
The surface of the lever that is pressed against the roller when the bucket is tilted is formed in a side view arc shape.

The door opening / closing structure is preferably
A pair of left and right arms extend from the lower frame in the opposite direction of the vehicle body.

In order to solve the above problems, the cargo handling vehicle according to the present invention
With the car body
A bucket with an opening on the other side of the car body,
A lower frame that extends from the vehicle body to support the bucket and is connected to the bucket via the first pivot shaft.
An inclined part that inclines the bucket in the opposite direction of the vehicle body with the first pivot axis as the fulcrum,
It is swingably connected to the bucket via the second pivot shaft, closes the bucket opening when the bucket is horizontal, and swings in the opposite direction of the vehicle body with the second pivot shaft as the fulcrum when the bucket is tilted. A door that opens the opening of the bucket and
It is characterized by having the above-mentioned door opening / closing structure.

The cargo handling vehicle is preferably
The bucket has an inner guide that guides the load towards the opening when tilted.

The cargo handling vehicle is preferably
When the bucket is tilted, the height of the lower end of the opening of the bucket is 100 mm to 250 mm above the ground.

The cargo handling vehicle is preferably
It is a cargo handling vehicle in which the driver drives in an upright position and moves forward with the bucket at the front.
The height of the upper surface of the driver's cab on which the driver rides is 100 mm to 400 mm from the ground.
The height of the upper surface of the bucket is 1500 mm to 1800 mm from the ground.

The cargo handling vehicle is preferably
The height of the upper surface of the lower frame is 300 mm to 500 mm from the ground.
The height of the axis center of the first pivot is 300 mm to 480 mm from the ground.
The distance between the opening of the bucket and the axis center of the first pivot shaft is 250 mm to 400 mm.
The angle at which the inclined portion inclines the bucket is 40 ° to 70 °.

The door opening / closing structure of the bucket for a cargo handling vehicle of the present invention can automatically open / close the door of the bucket at the time of loading and unloading without using an electric control device.

It is a top view which shows the cargo handling vehicle which concerns on one Embodiment of this invention. A is a side view of the cargo handling vehicle shown in FIG. 1, and B is an enlarged view of part B of A. It is a perspective view which shows the inside of the bucket shown in FIG. A is a side view showing a place where the bucket shown in FIG. 1 is tilted, and B is an enlarged view of a portion B of A. It is a perspective view which shows the door opening and closing structure when the bucket is horizontal. It is a perspective view which shows the door opening and closing structure when the bucket is tilted.

Hereinafter, an embodiment of a cargo handling vehicle bucket door opening / closing structure and a cargo handling vehicle provided with the door opening / closing structure according to the present invention will be described with reference to the attached drawings. In the figure, the double-headed arrows X, Y, and Z indicate the front-back direction, the left-right direction, and the up-down direction, respectively, and are orthogonal to each other.

<Structure of cargo handling vehicle>
First, the configuration of the cargo handling vehicle C excluding the door opening / closing structure 2 will be described. As shown in FIGS. 1 and 2, the cargo handling vehicle C according to the present embodiment includes a rear wheel 3, a vehicle body 4, a front wheel 5, a lower frame 6, a bucket 7, and a first pivot shaft 8. It includes a door 9, a second pivot shaft 10, and an inclined portion 11. The cargo handling vehicle C according to the present embodiment is configured to operate in a state where the driver stands upright. The front-rear direction in the figure is based on the forward direction and the reverse direction of the cargo handling vehicle C.

The rear wheel 3 is composed of one drive wheel 3a having a different diameter and a pair of left and right driven wheels 3b.

The vehicle body 4 is provided on the rear wheel 3, and has a cab 40, an operation unit 41, a brake pedal 42, and a drive unit 43. The height of the upper surface of the driver's cab 40 is configured to be 100 mm to 400 mm from the ground G. Since the upper surface of the driver's cab 40 is configured at the height, the driver can quickly and safely move up and down to the cargo handling vehicle C. Further, the driver's cab 40 is provided with a brake pedal 42. The brake pedal 42 is a deadman type brake, and the brake is released when the driver depresses the brake pedal 42. As a result, the cargo handling vehicle C is automatically braked when the driver gets off.

As shown in FIG. 2, the height of the operation unit 41 is adjusted to the height of the waist of the standing driver. Further, the operation unit 41 has a handle 41a and an operation lever 41b, the handle 41a is arranged on the left side of the driver's cab 40, and the operation lever 41b is arranged in front of the driver's cab 40. As a result, the driver can drive while turning his / her body diagonally when moving forward and backward, so that he / she can drive in a natural posture both when moving forward and when moving backward.

The drive unit 43 is provided in the vehicle body 4 and drives the rear wheels 3a. In the present embodiment, the cargo handling vehicle C is a battery vehicle, and the drive unit 43 has a motor operated by electric power supplied from a battery (not shown), but the present invention is merely an example and is not limited thereto.

In the present embodiment, the front wheel 5 is composed of four wheels, all of which are driven wheels. The lower frame 6 extends from the front surface of the vehicle body 4 toward the front and is supported by the front wheels 5. Further, the height of the upper surface of the lower frame 6 is configured to be 300 mm to 500 mm from the ground G. The height of the upper surface of the lower frame 6 means the height of the surface that supports the bucket 7.

As shown in FIG. 2, the bucket 7 is supported by the lower frame 6 above the lower frame 6 and is swingably connected to the lower frame 6 via the first pivot shaft 8. The height of the axis center of the first pivot shaft 8 is configured to be 300 mm to 480 mm from the ground G. As shown in FIGS. 2 and 3, the front end of the side wall 70 of the bucket 7 is inclined forward. As shown in FIG. 1, the upper portion of the bucket 7 is open, and the load is loaded into the bucket 7 from the upper portion. Further, as shown in FIG. 3, the bucket 7 has an opening 71 at the front portion, and the front portions of the left and right side wall 70s are tapered toward the opening 71 as shown in FIGS. 1 and 3. It is formed. The height of the upper surface of the bucket 7 is set to 1500 mm to 1800 mm from the ground G. This ensures a front view of the driver when moving forward. Further, since the height of the lower frame 6 is 300 mm to 500 mm from the ground G, the height of the bucket 7 may be 900 mm to 1100 mm even if the height of the upper surface of the bucket 7 is 1500 mm to 1800 mm from the ground G. can. Therefore, the cargo handling vehicle C can carry a large amount of cargo while being compact.

Further, the bucket 7 has guides 72 on the left and right sides of the inner front portion for guiding the load to the opening 71. As a result, the load is guided toward the opening 71 when the bucket 7 is tilted forward. In the present embodiment, the bucket 7 has no front wall and the front surface is open, but this is merely an example. For example, the bucket 7 has a front wall and the lower half of the front wall is configured as an opening 71. You may.

As shown in FIGS. 1 and 2, the door 9 is swingably connected to the upper part of the front end of the left and right side walls 70 of the bucket 7 via the second pivot shaft 10. As shown in FIGS. 2 and 5, the door 9 closes the opening 71 of the bucket 7 by its own weight when the bucket 7 is horizontal, and the door 9 is second when the bucket 7 is tilted as shown in FIGS. 4 and 6. It swings forward with the pivot shaft 10 as a fulcrum to open the opening 71 of the bucket 7.

As shown in FIG. 2, the inclined portion 11 is a hydraulic cylinder, the lower end thereof is swingably connected to the lower frame 6, and the upper end thereof is swingably connected to the bottom surface of the bucket 7. As shown in FIG. 3, the inclined portion 11 extends to lift the rear portion of the bucket 7 with the first locking shaft as a fulcrum, and inclines the bucket 7 forward. In the present embodiment, the inclined portion 11 inclines the bucket 7 by 50 °, but this is merely an example. For example, the inclined portion 11 may incline the bucket 7 between 40 ° and 70 °. Since the distance between the lower end of the opening 71 (that is, the front end of the side wall 70) and the axis center of the first pivot shaft 8 is 250 mm to 400 mm, the height of the lower end of the opening 71 when the bucket 7 is tilted. The distance is 100 mm to 250 mm from the ground G.

<Door opening / closing structure>
Next, the door opening / closing structure 2 included in the cargo handling vehicle C will be described with reference to the attached drawings. As shown in FIGS. 2 and 5, the door opening / closing structure 2 includes a pair of left and right arms 20, a roller 21, a bracket 22, a lock portion 23, a third pivot shaft 24, and an urging portion 25. It has a bracket 26 and.

The pair of left and right arms 20 extend at a distance from the vehicle body 4 with respect to the first pivot shaft 8. The rollers 21 extend to the left and right, and are rotatably connected between the pair of left and right arms 20 at a distance from the vehicle body 4 from the first pivot shaft 8.

The bracket 22 has a pair of left and right plates extending downward and is provided on the lower surface of the bucket 7. The bracket 22 corresponds to the "bracket" of the present invention.

As shown in FIGS. 2 and 5, the lock portion 23 has a locking portion 230, a lever 231 and a protrusion 232, and the central portion thereof is located at the lower end of the bracket 22 via the third pivot shaft 24. It is swayably connected to. The lock portion 23 and the third pivot shaft 24 may be integrally formed.

As shown in FIG. 5, the locking portion 230 has a pair of left and right plates, and as shown in FIG. 2, the locking portion 230 extends diagonally upward and forward from the center of the locking portion 23. Further, the locking portion 230 has a locking piece 230a at its front end. The locking piece 230a projects upward and is locked to the lower edge of the door 9.

As shown in FIG. 2, the lever 231 extends diagonally downward from the center of the lock portion 23 and is arranged above the roller 21. That is, the locking portion 230 and the lever 231 are fixed in a side view via the central portion of the locking portion 23. Further, the front surface of the lever 231 is formed in a side view arc shape, and the lower surface of the lever 231 is formed in a flat surface. As shown in FIGS. 5 and 6, when the bucket 7 is tilted, the lever 231 is first swung upward by pressing a flat surface against the roller 21, thereby causing the locking portion 230 to move downward. Swing. Subsequently, the lever 231 maintains the positional relationship between the locking portion 230 and the bucket 7 by pressing the arcuate surface against the roller 21.

The protrusion 232 is fixed to the upper surface of the locking portion 230 and extends upward.

In the present embodiment, the urging portion 25 has a spring body, the front end thereof is connected to the protrusion 232, and the rear end is connected to the bracket 26 extending downward from the lower surface of the bucket 7. The urging portion 25 swings the locking portion 230 upward by the urging force of the spring body, thereby locking the locking piece 230a to the lower edge of the door 9 and locking the door 9 in a closed state.

As shown in FIGS. 2 and 5, when the bucket 7 is horizontal, the lock portion 23 is locked by the locking portion 230 with the door 9 closed. Then, as shown in FIGS. 4 and 6, when the bucket 7 is tilted by the tilted portion 11, the flat surface of the lever 231 is pressed against the roller 21 and the lever 231 is swung upward, thereby locking. The portion 230 is swung downward. As a result, the door 9 is unlocked by the locking piece 230a, and the door 9 swings forward. As shown in FIG. 4, the lock portion 23 rotates clockwise at an appropriate angle when the bucket is tilted because the surface pressed against the roller 21 is formed in an arc shape, so that the lock portion 230 is placed on the ground G. It will not be touched. In the present embodiment, the lower surface of the lever 231 is formed on a flat surface, but the lever 231 may be formed on a continuous arcuate surface on the front surface and the lower surface in a side view. In other words, the lever 231 may have all the surfaces pressed against the rollers 21 formed in a side view arc shape.

Since the cargo handling vehicle C according to the present embodiment has the above configuration, it facilitates getting on and off the driver and prevents the bucket 7 from blocking the front view of the driver when moving forward. Further, the height of the axis center of the first pivot shaft 8 is 300 mm to 480 mm (about 406 mm in this embodiment) from the ground G, and the lower end of the opening 71 and the axis center of the first pivot shaft 8 The bucket 7 is configured to have a distance of 250 mm to 400 mm (about 370 mm in the present embodiment) and an inclination angle of the bucket 7 of 40 ° to 70 ° (about 50 ° in the present embodiment). The height of the lower end of the opening 71 of the bucket 7 when tilted is 100 mm to 250 mm (about 190 mm in this embodiment) from the ground G. Therefore, the cargo handling vehicle C can appropriately discharge the cargo into the underground hole.

Although the door opening / closing structure of the bucket for cargo handling vehicles of the present invention and one embodiment of the cargo handling vehicle provided with the door opening / closing structure have been described above, the door opening / closing structure and the cargo handling vehicle according to the present invention are limited to this. It's not a thing.

C Cargo handling vehicle G Ground 2 Door opening / closing structure 20 Arm 21 Roller 22 Bracket 23 Locking part 230 Locking part 230a Locking piece 231 Lever 24 Third pivot shaft 25 Erasing part 26 Bracket 3 Rear wheel 4 Body 40 Cabb 41 Operation Part 42 Brake pedal 43 Drive part 5 Front wheel 6 Lower frame 7 Bucket 70 Side wall 71 Opening 72 Guide 8 1st pivot shaft 9 Door 10 2nd pivot shaft 11 Inclined part

Claims (8)

With the car body
A bucket having an opening on the opposite side of the vehicle body,
A lower frame that extends from the vehicle body to support the bucket and is connected to the bucket via a first pivot shaft.
An inclined portion that inclines the bucket in the opposite direction of the vehicle body with the first pivot axis as a fulcrum, and
It is swingably connected to the bucket via a second pivot shaft, closes the opening of the bucket when the bucket is horizontal, and when the bucket is tilted, the second pivot shaft is used as a fulcrum. A door opening / closing structure for a bucket for a cargo handling vehicle, comprising a door that swings in the opposite direction of the vehicle body to open the opening of the bucket.
A pair of left and right arms provided on the lower frame and extending at a distance from the vehicle body from the first pivot shaft.
A roller that extends to the left and right and is rotatably connected between the pair of left and right arms at a distance from the vehicle body from the first pivot shaft.
The bracket provided on the lower surface of the bucket and
A locking piece that swingably connects the central portion to the bracket via the third pivot shaft, extends unilaterally from the central portion, and is locked to the lower edge of the door is provided. When the bucket is tilted and is arranged above the roller so as to extend from the center to the other, the locked portion is pressed against the roller to swing the locked portion downward. A lock portion having a lever for releasing the locking of the stop portion,
A door opening / closing structure comprising: an urging portion that swings the locking portion upward by an urging force and locks the door by the locking piece when the bucket is horizontal. The door opening / closing structure according to claim 1, wherein the surface of the lever pressed against the roller when the bucket is tilted is formed in a side view arc shape. The door opening / closing structure according to claim 1 or 2, wherein the pair of left and right arms extend from the lower frame in the opposite direction of the vehicle body. With the car body
A bucket having an opening on the opposite side of the vehicle body,
A lower frame that extends from the vehicle body to support the bucket and is connected to the bucket via a first pivot shaft.
An inclined portion that inclines the bucket in the opposite direction of the vehicle body with the first pivot axis as a fulcrum, and
It is swingably connected to the bucket via a second pivot shaft, closes the opening of the bucket when the bucket is horizontal, and when the bucket is tilted, the second pivot shaft is used as a fulcrum. A door that swings in the opposite direction of the vehicle body to open the opening of the bucket,
A cargo handling vehicle comprising the door opening / closing structure according to any one of claims 1 to 3. The cargo handling vehicle according to claim 4, wherein the bucket has a guide inside which guides the load toward the opening when tilted. The cargo handling vehicle according to claim 4 or 5, wherein when the bucket is tilted, the height of the lower end of the opening of the bucket is 100 mm to 250 mm from the ground. It is a cargo handling vehicle in which the driver drives in an upright position and moves forward with the bucket at the front.
The height of the upper surface of the driver's cab on which the driver rides is 100 mm to 400 mm from the ground.
The cargo handling vehicle according to any one of claims 4 to 6, wherein the height of the upper surface of the bucket is 1500 mm to 1800 mm from the ground. The height of the upper surface of the lower frame is 300 mm to 500 mm from the ground.
The height of the axis center of the first pivot is 300 mm to 480 mm from the ground.
The distance between the opening of the bucket and the axis center of the first pivot shaft is 250 mm to 400 mm.
The cargo handling vehicle according to claim 7, wherein the angle at which the inclined portion inclines the bucket is 40 ° to 70 °.

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