JPS6346518Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a technology for installing an earth removal plate in front of a cargo box of a crawler-type earthworks transport vehicle.

(b) Prior art Earthwork transport vehicles are used for transporting earth and sand in narrow spaces at construction sites, but it is desirable that they can be used not only for transportation in water works, etc., but also for backfilling earth and sand after the work is completed. It is because of this.

Conventionally, there have been technologies such as the one described in Japanese Utility Model Application Publication No. 55-31828, in which the earth removal plate is placed in a position opposite to the direction in which the cargo box is dumped and the earth and sand is unloaded, facing backward. .

However, when transporting the unloaded earth and sand, it was necessary to change the orientation of the aircraft each time before transporting, making it impossible to work in narrow spaces.

(c) Problems that the invention aims to solve In order to solve this problem, the invention provides a method in which by installing an earth removal plate in front of the position where earth and sand are unloaded from the cargo box, the earth and sand can be unloaded by placing the earth and sand in the loading box in a dump state. At the same time, the forward movement of earth and sand is blocked by the earth removal plate, which is inconvenient.In order to improve this problem, a hydraulic cylinder was provided to fix the earth removal plate upward.

It is difficult to provide a pivot point for the hydraulic cylinder 4 other than the cargo box, and depending on the positional relationship of the pivot points, there is a problem in that when the cargo box is placed in a dump state, the earth removal plate may come down.

The present invention is an earthworks transport vehicle that has an earth removal plate placed in front of the position where earth and sand is unloaded when the cargo box is dumped, and a hydraulic cylinder that allows the earth removal plate to move up and down. The structure is such that the earth removal plate does not fall when the dump truck is rotated.

(d) Means for solving the problem The purpose of the present invention is as described above. Next, the configuration for achieving the purpose will be explained.

A cargo box 1 provided at the front of the vehicle body can be tilted upward by the extension of the dump cylinder 5 around a pivot point B at the tip, and unloaded earth and sand is moved to the lower part of the front on the pivot point B side. The earth removal plate 3 is arranged so as to be movable up and down, and earth and sand falls between the earth removal plate 3 and the tip of the loading box 1 when the dumping box 1 rotates. The pivot point C of the rear end of the earth removal plate support rod 3a that supports
Of the pivot points at both ends of the hydraulic cylinder 4 that moves the soil removal plate 3 up and down, one pivot point A is held in the middle of the soil removal plate support rod 3a, and the other pivot point E is held at the midpoint of the soil removal plate support rod 3a. It is provided behind the pivot point B of the moving cargo box 1, and the pivot point B and the pivot point A are located at approximately the same height from the ground at the position where the earth removal plate 3 is raised when unloading the cargo box 1. Configure the pivot point A, B,
The relationship between AC and BC is configured such that AC is approximately the same as or lower than BC in a side view.

(E) Embodiment The purpose and structure of the present invention are as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is an overall side view of the earthworks transport vehicle, FIG. 2 is an overall plan view, and FIG. 3 is an overall front view.

The crawler 7 is driven by a drive sprocket 8, and the drive sprocket 8 is shifted and driven by a transmission transmission 13 that changes the rotation speed of the engine 10. Engine 1 on chassis 9
0, a transmission transmission device 13, a seat 12, a left/right steering clutch 14, etc. are supported, and an illumination light 11 is provided above the engine 10.

A connecting rod 16 shown in FIG. 3 is spanned between the truck frames 6, 6 that support the crawler 7 under tension, and the lower end 5a of the dump cylinder 5 is pivotally supported on the connecting rod 16 by an outer cylinder 17. There is.

As shown in FIG. 3, the cargo box 1 has a pivot point B above and in front of the connecting rod 16 when viewed from the front, and as the dump cylinder 5 expands around the pivot point B,
The cargo box 1 is tilted forward and upward. 5b is a pivot point that pivots the front end of the dump cylinder 5 to the lower part of the cargo box 1, and 15 is a pivot pin of the cargo box 1.

The earth removal plate 3 has an earth removal plate support rod 3a, and the terminal end of the earth removal plate support rod 3a is pivotally supported on the truck frame 6 at a pivot point C. A hydraulic cylinder 4 rotates the earth removal plate 3. The front end of the hydraulic cylinder 4 is pivotally supported on the earth removal plate support rod 3a at a pivot point A, and the rear end is pivotally supported on the side surface of the cargo box 1 at a pivot point E.

The front end of the cargo box 1 is provided with a front plate 2 that rotates around a pivot point 2a to open, and the rear end is provided with a rear plate 1a that is constructed high so that even if a heap of earth and sand is piled up, it will not spill out. ing.

FIG. 4 is a diagram showing the positional relationship of the pivot points of the present invention, and FIG. 5 is a diagram showing the positional relationship of the pivot points where failure occurs.

In FIG. 4, since the positional relationship between pivot points A, B, and C, which are the technical elements of the present invention, is configured such that AC<BC, the pivot point A at the front end of the hydraulic cylinder 4 is It is located closer to the pivot point C of the earth removal plate support rod 3a than the fulcrum B, and when the cargo box 1 is tilted to the dumping state, the pivot point E at the base of the hydraulic cylinder 4 rises upward and becomes E'. When the position is reached, the pivot point A is lifted by the hydraulic cylinder 4,
It comes to position A'.

As a result, the earth removal plate 3 further rises to the position 3'.

As described above, if the relationship is configured such that AC<BC, even if the cargo box 1 is dumped with the soil removal plate 3 raised, the soil removal plate 3 will be pulled up further, so that the earth and dirt will be removed from the cargo box 1. Even if the earth and sand are discharged, the discharge plate 3 will not come down to a position where it will block the forward movement of the earth and sand.

Further, as shown in FIG. 1, if AC=BC, when the cargo box 1 is dumped, the pivot point A of the hydraulic cylinder 4 on the earth removal plate support rod 3a is the pivot point B of the cargo box 1.
Since the earth removal plate 3 reaches approximately the same position as the earth removal plate 3, it does not move.

Fig. 5 shows the positional relationship of the pivot points where AC>BC, which is the opposite of the present invention. Preventing the forward movement of earth and sand,
In addition, when the loading box 1 is rotated for dumping with the raising width of the earth removal plate 3 reduced, the lowered earth removal plate 3 touches the ground, and the extension force of the dump cylinder 5 causes the loading box 1 to tilt and remove the earth. When the plate 3 pushes against the ground, the front end of the aircraft body rises, causing the entire vehicle body to tilt, posing the risk of overturning.

The present invention can eliminate such problems.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, when dumping and rotating the cargo box 1 with the earth removal plate 3 in a low position during earth and sand discharge work, depending on the positional relationship of the pivot points, the earth removal plate 3 may descend further and the machine will be lifted up. or destroy the earth removal board 3,
The hydraulic cylinder 4 could have been destroyed, but if the relationship between the pivot points A, B, and C was changed as in the present invention,
By setting AC<BC, the earth removal plate 3 does not descend due to the dump rotation of the cargo box 1.

Second, since the earth discharge plate 3 always rises when the dumping box 1 rotates, the earth and sand falling from the loading box 1 are no longer obstructed from moving forward.

Moreover, the earth and sand that fell on the earth removal plate 3 at the front position does not apply pressure and provide resistance to the vertical movement of the earth removal plate 3.

Thirdly, as in the conventional technology described in Japanese Utility Model Application Publication No. 55-31828, the falling position of the earth and sand in the cargo box 1 and the earth discharge plate 3
Because they are placed in the same position, rather than in opposite positions, it is possible to remove the fallen earth and sand as it is, improving work efficiency.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of the earthworks transport vehicle, Fig. 2 is an overall plan view, Fig. 3 is an overall front view, Fig. 4 is a diagram showing the positional relationship of the pivot points of the present invention, and Fig. 5 is an overall plan view. It is a drawing showing the positional relationship of pivot points where a malfunction occurs. 1... Loading box, 3... Earth removal plate, 4... Hydraulic cylinder, 5... Dump cylinder, 6... Truck frame, 7... Crawler, A... Pivot point at the front end of the hydraulic cylinder, B ...The pivot point of the packing box, C...
...Pivot point at the rear end of the earth removal plate support rod, E...Pivot point at the rear end of the hydraulic cylinder.

Claims (1)

[Scope of utility model registration request] A cargo box 1 provided at the front of the vehicle body can be tilted upward by the extension of the dump cylinder 5 around a pivot point B at the tip, and unloaded earth and sand is moved to the lower part of the front on the pivot point B side. The earth removal plate 3 is arranged so as to be movable up and down, and earth and sand falls between the earth removal plate 3 and the tip of the loading box 1 when the dumping box 1 rotates. The pivot point C of the rear end of the earth removal plate support rod 3a that supports
Of the pivot points at both ends of the hydraulic cylinder 4 that moves the soil removal plate 3 up and down, one pivot point A is held in the middle of the soil removal plate support rod 3a, and the other pivot point E is held at the midpoint of the soil removal plate support rod 3a. It is provided behind the pivot point B of the moving cargo box 1, and the pivot point B and the pivot point A are located at approximately the same height from the ground at the position where the earth removal plate 3 is raised when unloading the cargo box 1. Configure the pivot point A, B,
An earthworks transport vehicle characterized in that AC is approximately the same as or lower than BC in a side view.