JP2019048540A - Dump truck - Google Patents

Abstract

To provide a dump truck capable of achieving weight reduction of a loading space.SOLUTION: In a dump truck (1), a loading space (5) is rotatably installed vertically on a vehicle body frame (2) provided with a cab (9) and a control box (10) through a hinge pin (7). The loading space (5) includes a bottom plate (21) constituting a bottom part, a front plate (22) constituting a front face and a pair of side plates (23) positioned on both sides of the bottom plate (21). On the vehicle body frame (2), a top plate (6) covering above the cab (9) and the control box (10) is fixed through a support member (12).SELECTED DRAWING: Figure 4

Description

  The present invention relates to a dump truck that transports an object to be transported such as soil.

  Generally, a dump truck is provided with a vehicle body frame in which four wheels are arranged. A driver's cab and a control box are disposed at the upper front of the body frame. Further, a load carrier is attached to the vehicle body frame from the center to the rear on the vehicle body frame.

  The bed is connected to the vehicle body frame by a hinge pin attached to the rear of the vehicle body frame and a hoist cylinder attached to the front of the vehicle body frame from the hinge pin. And this loading platform is rotated in the up-and-down direction centering on a hinge pin (it carries out up-and-down movement) with expansion and contraction operation of a hoist cylinder.

  An object to be transported, such as earth and sand or crushed stone, is stacked on a loading platform of a dump truck, for example, with a hydraulic shovel or the like. Then, the dump truck is configured to be able to unload the object to be transported loaded on the loading platform by transferring the loading platform from the laid state to the upright state (see, for example, Patent Document 1).

  The loading platform described in Patent Document 1 includes a bottom portion forming a bottom portion, a front plate positioned on the front side of the bottom plate to form a front surface, and a pair of side plates positioned on both sides of the bottom plate. There is. At the upper portion of the front plate of the loading platform, a top plate portion projecting forward is integrally formed so as to cover the cab and the control box.

JP-A-2015-529596

  As described above, in the conventional dump truck, since the top plate is integrally formed on the front plate of the loading platform, the weight of the entire loading platform including the top plate is large, and in particular, it is possible to use hinge pins and hoist cylinders The load is heavy. Therefore, weight reduction of the cargo bed is desired.

  The present invention has been made from the situation in the above-mentioned prior art, and its object is to reduce the weight of a loading platform in a dump truck.

  In order to achieve the above object, a typical dump truck according to the present invention comprises a body frame provided with a cab and a control box, a hinge pin disposed at the rear of the body frame, and the body frame via the hinge pin. And a hoisting cylinder for pivoting the platform in the vertical direction, wherein the platform comprises a bottom plate forming a bottom portion, and a bottom plate of the bottom plate. A front plate positioned on the front side and forming a front surface, and a pair of side plates positioned on both sides of the bottom plate, and a top plate covering the upper part of the driver's cab and the control box is supported on the vehicle body frame It is characterized in that it is fixed via a member.

  The dump truck according to the present invention can achieve weight reduction of the loading platform by including the above-described configuration. Other problems, configurations, and effects are clarified by the following description of the embodiment.

It is a side view which shows the state at the time of loading the conveyance target object of the dump truck which concerns on 1st Embodiment of this invention. It is a perspective view of the loading platform with which the dump truck shown in FIG. 1 is equipped. It is a perspective view of the top plate with which the dump truck shown in FIG. 1 is equipped. It is a side view which shows the state which raised the loading platform of the dump truck shown in FIG. It is a perspective view which shows the connection state of the loading platform shown in FIG. 2, and the top plate shown in FIG. It is a principal part expansion perspective view of the connected loading platform and top plate shown in FIG. It is a side view which shows the state which raised the connected loading platform and top plate of the dump truck shown in FIG. It is a perspective view which shows the connection state of the loading platform and top plate with which the dump truck concerning 2nd Embodiment of this invention is equipped.

  Hereinafter, an embodiment for carrying out a dump truck according to the present invention will be described based on the drawings.

First Embodiment
FIG. 1 is a side view showing the dump truck according to the first embodiment of the present invention in a loading state. As shown in FIG. 1, the dump truck 1 according to the first embodiment includes a vehicle body frame 2, a pair of front wheels 3, a pair of rear wheels 4, a loading platform 5, and a ceiling separately formed from the loading platform 5. The board 6 is provided. The pair of front wheels 3 is rotatably attached to the left and right ends of the front of the vehicle body frame 2. Further, the pair of rear wheels 4 is rotatably attached to the left and right ends of the rear of the vehicle body frame 2. The loading platform 5 is a portion on which the object to be transported A such as soil, crushed stone, etc. is loaded, and is mounted on the vehicle body frame 2 so as to be able to be undulated.

  Attached to the rear of the vehicle body frame 2 is a hinge pin 7 which is the center of rotation when the loading platform 5 is raised or lowered (turned up and down). A pair of left and right hoist cylinders 8 as hydraulic cylinders connecting the vehicle body frame 2 and the loading platform 5 are attached to the front of the hinge pin 7 of the vehicle body frame 2. The pair of hoist cylinders 8 are attached to a substantially central portion in the front-rear direction of the vehicle body frame 2. Further, above the front wheel 3 on the left side of the vehicle body frame 2, a cab 9 which is a cab where an operator rides, and a control box 10 which controls the dump truck 1 are provided. Furthermore, a power unit 11 in which hydraulic equipment is accommodated is provided at the front of the vehicle body frame 2.

  The top plate 6 is provided above the cab 9 and the control box 10 in order to prevent damage to the cab 9, the control box 10, the power unit 11 and the like due to the drop of the object to be transported A. The top plate 6 is detachably attached to the support member 12 installed on the vehicle body frame 2 (specifically, on the deck) using a required fixing member (for example, a bolt or a clamp) not shown. . The support member 12 includes a plurality of columns 12a erected in the front and rear and left and right of the cab 9, a vertical rail 12b connecting upper ends of the plurality of columns 12a erected in the front and rear of the cab 9 It is comprised from the crossbar which is not shown in figure which connects the upper end part of several erected support | pillar 12a. In addition, the support member 12 should just have a structure which can hold | maintain the top plate 6 stably, and is not limited to said structure.

  The hoist cylinder 8 is telescopically operated by the operator operating an operation member (not shown) provided in the cab 9. The loading platform 5 pivots downward about the hinge pin 7 with the contracting operation of the hoist cylinder 8 to be in the laid posture to be seated on the vehicle body frame 2. In addition, the loading platform 5 is pivoted upward about the hinge pin 7 with the extension operation of the hoist cylinder 8 to be in a standing posture (see FIG. 4) for releasing the object to be transported A.

  Next, the structures of the loading platform 5 and the top 6 will be described in detail. FIG. 2 is a perspective view of a loading platform provided in the dump truck according to the first embodiment. As shown in FIG. 2, the cargo bed 5 has a substantially box shape in which the upper side and the rear side are opened by the bottom plate (floor) 21, the front plate (front) 22, and the two side plates (sides) 23. A loading unit 24 for loading the object to be transported A is formed therein. The bottom plate 21, the front plate 22 and the side plate 23 are respectively joined by welding. Further, on the outer surface of the side plate 23, as shown in FIG. 1, when the loading platform 5 is seated on the vehicle body frame 2, it abuts against the side portion of the vehicle body frame 2 to prevent the loading platform 5 from moving in the left-right direction. A guide 25 is provided. The guide 25 and the side plate 23 are joined by welding.

  As shown in FIG. 2, the front plate 22 is provided with a connecting portion 22a which is projected to the front side of the dump truck 1 from the upper end portion thereof, and a large number of bolt through holes 22b are provided in the connecting portion 22a. Is open.

  FIG. 3 is a perspective view of a top plate provided in the dump truck according to the first embodiment. As shown in FIG. 3, the top plate 6 has a top plate main body 31 having a shape and a size sufficient to cover the upper portions of the cab 9 and the control box 10, and protrudes upward from the front end of the top plate main body 31. It is comprised by the provided front edge part 32 and the side edge part 33 provided so that it might protrude upwards from the side part of the top-plate main body 31. As shown in FIG. Thus, in the top board 6 of the present embodiment, since the front edge 32 and the side edge 33 are provided around the top board main body 31, the falling of the object to be transported A on the top board 6 is It can prevent.

  A large number of screw holes 34 are opened in the rear end portion side of the top plate main body 31. The screw holes 34 are formed in the same arrangement as the bolt through holes 22 b formed in the connecting portion 22 a of the front plate 22 of the loading platform 5. Further, the front plate 22 of the loading platform 5 is configured such that the lower surface of the connecting portion 22a abuts against the upper surface of the top plate main body 31 when the lifting cylinder 8 is contracted to seat the loading platform 5 on the vehicle body frame 2 There is. Therefore, with the loading platform 5 and the top board 6 in a state in which the loading platform 5 is seated on the vehicle body frame 2, the bolt 41 (connection member) inserted into the bolt through hole 22 b is screwed into the screw hole 34 and tightened. Can be assembled together (see FIG. 5).

  Since the dump truck 1 according to the first embodiment is configured as described above, the loading platform 5 can be raised and lowered alone, or can be loaded and unloaded in the state where the loading platform 5 and the top plate 6 are connected. You can also.

  That is, when the dump truck 1 according to the first embodiment fixes the top plate 6 to the support member 12 and releases the connection between the loading platform 5 and the top plate 6, the hoist cylinder 8 is extended as shown in FIG. As shown in FIG. 4, the loading platform 5 alone pivots upward about the hinge pin 7 to be in the standing posture in which the object to be transported A is released. In addition, when the hoist cylinder 8 is contracted from this state, the loading platform 5 alone pivots downward about the hinge pin 7, and the loading posture in which the object to be transported A can be loaded is obtained.

  As described above, when the loading platform 5 is raised and lowered alone, the object to be transported A can be released without the lifting operation of the top 6 which is a heavy load, so that the weight of the loading platform 5 can be reduced. Further, since the load applied to the hinge pin 7 at the time of earth release is reduced by the weight of the top plate 6, the stress applied to the hinge pin 7 and the hinge pin bracket supporting the hinge pin 7 is reduced, and the life of these components is also extended. It can be done. Furthermore, the fuel consumption of the dump truck 1 can be improved. In addition, even when the loading platform 5 is raised and lowered independently, the top plate 6 is fixed above the cab 9 and the control box 10, so the cab 9, the control box 10, the power unit 11, etc. Can prevent damage.

  On the other hand, the dump truck 1 according to the first embodiment releases the fixing of the top 6 to the support member 12 and extends the hoist cylinder 8 in a state where the loading platform 5 and the top 6 are connected, as shown in FIG. As shown in FIG. 4, the loading platform 5 and the top plate 6 integrally rotate upward about the hinge pin 7 to be in the standing posture in which the object to be transported A is released.

  When the loading platform 5 and the top plate 6 are connected, first, the hoist cylinder 8 is contracted to seat the loading platform 5 on the vehicle body frame 2, and the lower surface of the connecting portion 22 a provided on the front plate 22 of the loading platform 5 is the top plate main body Abut the top of 31. The state at this time is shown in FIG. In the state of FIG. 5, the plurality of bolt through holes 22 b opened in the connecting portion 22 a and the plurality of screw holes 34 opened in the top plate main body 31 are respectively disposed to face each other. Next, as shown in an enlarged manner in FIG. 6, the bolt 41 which is a connecting member is inserted into the bolt through hole 22b, and the bolt 41 projected from the lower surface of the connecting portion 22a is screwed into the screw hole 34 and tightened. . Thereby, the loading platform 5 and the top plate 6 can be assembled integrally.

  As described above, when the loading object A is spilled onto the top plate 6 while loading the loading object A onto the loading platform 5 by integrating the loading platform 5 and the top plate 6 and causing the loading platform 5 to stand up. Even if it is, the to-be-carried item A can be easily removed. Therefore, there is no need for the worker to manually remove the transport object A, and the labor of the worker is reduced.

Second Embodiment
Next, a second embodiment of the present invention will be described based on FIG. FIG. 8 is a perspective view showing a connected state of a loading platform and a top plate provided in a dump truck according to a second embodiment of the present invention.

  The second embodiment is different from the first embodiment in that a damming member 42 of the object to be transported A is provided at the connecting portion 22a of the front plate 22 constituting the loading platform 5, but the other configuration is the same. It is. Therefore, in the following description, this difference will be made, and the same components will be assigned the same reference numerals and descriptions thereof will be omitted.

  As shown in FIG. 8, in the second embodiment, a blocking member 42 having a height slightly higher than the height of the side edge 33 formed on the top plate 6 is provided at the tip of the connecting portion 22a. ing. Thereby, in the second embodiment, the damming member 42 prevents or suppresses the movement of the object to be transported A loaded on the loading platform 5 to the top plate 6 side. Therefore, according to the second embodiment, it is possible to connect the loading platform 5 and the top board 6 to reduce the frequency of releasing the transport target A deposited on the top board 6, thereby enhancing the operation efficiency of the dump truck 1. Can.

  In the example of FIG. 8, the blocking member 42 is provided at the tip of the connecting portion 22a, but in order to prevent the entry of the object to be transported A into the bolt through hole 22b, the bolt penetration of the connecting portion 22a is performed. A blocking member 42 may be provided on the rear side of the hole 22b (the connection portion between the front plate 22 and the connecting portion 22a). In the example of FIG. 8, the blocking member 42 is formed to have a size slightly higher than the height dimension of the side edge 33 formed on the top plate 6, but the height dimension of the blocking member 42 is limited Instead, the height may be set to be approximately the same height as the side edge portion 33, or the like, as necessary.

  Further, the present invention is characterized in that the top plate 6 covering the cab 9 and the upper portion of the control box 10 is fixed to the vehicle body frame 2. Therefore, the loading platform 5 and the top plate 6 can be configured to be connectable as described in the embodiment, or can be configured to be not connected. That is, the top plate 6 may be fixed to the vehicle body frame 2 in a non-detachable manner. Thus, the present invention can be implemented by appropriately changing, adding, and deleting the above embodiment.

  For example, in the first and second embodiments, the bolt 41 is used as a connecting member for connecting the loading platform 5 and the top plate 6, but it is also possible to use another connecting member such as a clamp. Further, a through hole may be provided instead of the screw hole 34, and the top plate 6 and the connecting portion 22a of the front plate 22 may be fixed by a bolt and a nut.

1 dump truck 2 vehicle body frame 5 loading platform 6 top plate 7 hinge pin 8 hoist cylinder 9 cab (cab)
10 Control Box 12 Support Member 22 Front Plate 22a Connection 22b Bolt Through Hole 34 Screw Hole 41 Bolt (Connection Member)
42 Holding member

Claims (5)

A vehicle body frame provided with a cab and a control box, a hinge pin disposed at the rear of the vehicle body frame, a loading platform rotatably mounted vertically with respect to the vehicle body frame via the hinge pin, and the loading platform In a dump truck comprising a hoist cylinder for rotating the
The loading platform comprises a bottom plate forming a bottom portion, a front plate positioned on the front side of the bottom plate to form a front surface, and a pair of side plates positioned on both sides of the bottom plate.
A top plate covering the upper part of the cab and the control box is fixed to the vehicle body frame via a support member. In the dump truck according to claim 1,
A dump truck, wherein the loading platform and the top plate are configured to be connectable via a connecting member, and the loading platform and the top plate are integrally rotatable in the vertical direction by the hoist cylinder. In the dump truck according to claim 2,
The front plate includes a connecting portion projecting forward from its upper end,
A dump truck, wherein the connecting portion is configured to overlap a part of an upper portion of the top plate when the cargo bed is seated on the vehicle body frame. In the dump truck according to claim 3,
The dump truck according to claim 1, wherein the connecting portion includes a blocking member at a tip end thereof for blocking a spilled object to be transported loaded on the loading platform on the top plate side. In the dump truck according to claim 3 or 4,
The dump truck characterized in that the connecting portion and the top plate can be connected by a plurality of bolts which are the connecting members.

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