JP2019043481A - Dump truck - Google Patents

Abstract

To provide a dump truck which can inhibit a housing from being deformed and damaged by vibration caused during travelling even if a heavy object is placed on the housing.SOLUTION: A trolley type dump truck 1 includes: a vehicle body frame 2; front wheels 3A and rear wheels 3B attached to the vehicle body frame 2; a housing 4 defining a machine room; and a pair of rod-like members 8L, 8R which connects the vehicle body frame 2 with the housing 4. The housing 4 is erected in front of an axle of the front wheel 3A on the vehicle body frame 2 and has a placement part 42 for placing a current collecting device 5 which is a heavy object thereon at the upper end side. The pair of rod-like members 8L, 8R is fixed to the placement part 42 at upper end parts and is fixed to the vehicle body frame 2 at lower end parts while inclining relative to a vehicle height direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a dump truck in which a building defining a machine room is mounted on a vehicle body frame.

  2. Description of the Related Art A trolley type dump truck is conventionally known that has a pantograph mounted on the building roof and travels with electric power obtained from a trolley wire (overhead line) via the pantograph.

  In general, a trolley type dump truck is used for transporting ore in a mine and travels on a large uneven surface, for example, in a trolley type truck disclosed in Patent Document 1, a pantograph framework due to strong vibration and shaking while traveling A frame guide is attached to the pantograph frame in order to prevent the roll of the car.

Revised 2013/124994 gazette

  However, in the trolley type truck described in Patent Document 1, unlike a general dump truck, a heavy load pantograph is mounted on the roof of a building, and a frame guide is also attached. Is getting bigger. In addition, since the building is erected in the vicinity of the front of the front wheel in contact with the road surface, the building is susceptible to vibrations generated during traveling. Therefore, as the load applied to the building increases, the magnitude of vibration received by the building increases, so stress concentrates on the connection between the building and a heavy load, and the connection and its periphery are deformed or damaged. It becomes easy to do.

  Therefore, an object of the present invention is to provide a dump truck capable of suppressing deformation and breakage of a building due to vibration during traveling even when a heavy load is placed on the roof of a building.

  In order to achieve the above object, a pair of rod-like members connecting a body frame, front and rear wheels respectively attached to the body frame, a building defining a machine room, the body frame and the building And the building is provided on the upper end side of a mounting portion which is erected in front of an axle of the front wheel on the vehicle body frame, and on which a heavy load is to be placed; One aspect of the present invention provides a dump truck characterized in that one end is fixed to the mounting portion and the other end is fixed to the vehicle body frame in a state of being inclined with respect to the vehicle height direction.

  According to the present invention, even when a heavy load is placed on the roof of the building, it is possible to suppress deformation and damage of the building due to vibration during traveling. Problems, configurations, and effects other than those described above will be apparent from the description of the embodiments below.

It is a side view showing an example of 1 composition of a trolley type dump truck concerning an embodiment of the present invention. It is a front view of a trolley type dump truck. The trolley type dump truck WHEREIN: It is the perspective view which extracted and showed the vehicle body frame, the building, the front wheel, and the current collection apparatus. The trolley type dump truck WHEREIN: It is the side view which extracted and showed the vehicle body frame, the building, the front wheel, and the current collection apparatus. The trolley type dump truck WHEREIN: It is the front view which extracted and showed the vehicle body frame, the building, the front wheel, and the current collection apparatus. It is an enlarged view of the X section in FIG. It is a front schematic diagram explaining the state when the acceleration of a vehicle width direction acts on a trolley type dump truck.

  Hereinafter, a trolley type dump truck driven by electricity will be described as one aspect of the dump truck according to the embodiment of the present invention.

<Overall Configuration of Trolley Type Dump Truck 1>
First, the entire configuration of the trolley type dump truck 1 will be described with reference to FIGS.

  FIG. 1 is a side view showing a configuration example of a trolley type dump truck 1 according to an embodiment of the present invention. FIG. 2 is a front view of the trolley type dump truck 1. 3 to 5 are views showing the body frame 2, the building 4, the front wheel 3A, and the current collector 5 in the trolley type dump truck 1, FIG. 3 is a perspective view, and FIG. 4 is a side view FIG. 5 is a front view.

  The trolley type dump truck 1 is, for example, an open pit mine etc., and is a large-sized transport working machine that transports a large amount of soil and minerals excavated by a shovel, and is, for example, a vehicle whose vehicle height exceeds several meters. In addition, the trolley type dump truck 1 travels by obtaining electric power from the trolley wire W, and in the mine, a loading place for loading the earth and sand and minerals, an earth removal place for releasing the transported cargo, and a loading place Travels mainly on the transportation route connecting the land with the site.

  As shown in FIG. 1, the trolley type dump truck 1 includes a vehicle body frame 2 which is a frame supporting the entire vehicle, a pair of left and right front wheels 3A rotatably attached to the front of the vehicle body frame 2, and a vehicle body frame A pair of left and right rear wheels 3B rotatably mounted at the rear of 2, a building 4 defining a machine room, a current collector 5 for obtaining electric power from a trolley wire W, and a traffic area for operators and workers And an operator's cab 60 for the operator to ride, and a vessel 7 for loading a large amount of soil and minerals. In FIG. 1, only the left front wheel 3A and the rear wheel 3B among the pair of left and right front wheels 3A and rear wheels 3B are shown.

  As shown in FIG. 3, the vehicle body frame 2 has side frame portions 21 extending in the longitudinal direction on both sides in the vehicle width direction, and a support frame portion 22 supporting the deck 6. The support frame portion 22 includes an extending portion 221 extending upward from the front portion of the pair of left and right side frame portions 21 and a connecting portion 222 connecting the pair of left and right extending portions 221 in the vehicle width direction. It is done.

  As shown in FIG. 3 and FIG. 4, the building 4 is erected in front of the axle of the front wheel 3A on the vehicle body frame 2. As shown in FIG. 2, FIG. 3 and FIG. 5, the building 4 connects the side plate portions 41 respectively erected from the pair of left and right side frame portions 21 and the pair of left and right side plate portions 41 in the vehicle width direction It has a box-like shape having an upper plate portion 42 and a front grille 43 as a front plate portion surrounded by the pair of side plate portions 41 and the upper plate portion 42.

  For example, equipment such as an engine and a radiator (all not shown) are accommodated inside the building 4, and these devices are cooled by air taken in from a plurality of air holes 430 formed in the front grille 43 etc. Be done.

  The building 4 and the vehicle body frame 2 are connected by a pair of rod-like members 8L and 8R. The pair of rod-like members 8L and 8R function as so-called braces, and one end portion thereof is fixed to the upper plate portion 42 of the building 4 while being inclined with respect to the vehicle height direction, and the other end portion is a vehicle body It is fixed to frame 2. The specific configuration of the pair of rod-like members 8L and 8R will be described later.

  The current collector 5 includes a pantograph 51 having a pair of current collectors 510L and 510R for contacting the trolley wire W (see FIGS. 1 and 2) to collect electricity, and a pantograph support 52 for supporting the pantograph 51. It is a heavy load. 1 and 2 show the pantograph 51 folded up, and when the pair of current collectors 510L, 510R of the pantograph 51 are brought into contact with the trolley wire W, the hydraulic pressure mounted on the pantograph 51 The pantograph 51 is raised upward by a cylinder, a spring or the like.

  The current collector 5 is mounted on the upper end portion of the building 4 by the pantograph support 52 being mounted on the upper plate portion 42 of the building 4. That is, the upper plate portion 42 of the building 4 is an aspect of the mounting portion for mounting the current collector 5 which is a heavy load. In the following description, the "upper plate portion 42" is also referred to as the "mounting portion 42".

  The deck 6 is supported by the support frame portion 22 and the building 4 of the vehicle body frame 2 and can be divided into, for example, a left area 6L, a central area 6C, and a right area 6R as shown in FIG. In the present embodiment, the driver's cab 60 is disposed in the left area 6L of the deck 6. The central region 6C is provided on the building 4 (mounting portion 42), and the current collector 5 is mounted.

  The vessel 7 is attached to the vehicle body frame 2 so as to be able to tilt, and can be tilted (turned) in the vertical direction by expanding and contracting a hoist cylinder (not shown) connected to the side frame portion 21. it can. For example, by extending the hoist cylinder and lifting the front of the vessel 7 upward, it is possible to discharge loaded soil, minerals and the like.

<Composition of a pair of rod-like members 8L and 8R>
Next, the configuration of the pair of rod-like members 8L and 8R will be described with reference to FIG. 2, FIG. 3, FIG. 5, and FIG.

  FIG. 6 is an enlarged view of a portion X in FIG. 6, illustration of the front grille 43 arrange | positioned at the back of a pair of rod-shaped member 8L, 8R is abbreviate | omitted for convenience.

  Each of the pair of rod-like members 8L and 8R is, for example, a hollow rectangular tubular member formed by using a general structural square steel pipe (STKR) or the like. In addition, since a pair of rod-shaped members 8L and 8R have mutually the same structure, below, the left rod-shaped member 8L of a pair of rod-shaped members 8L and 8R is mentioned as an example, and is demonstrated.

  The left rod-like member 8L is attached to the trolley type dump truck 1 and extends from the mounting portion 42 side to the vehicle body frame 2 side, and an upper end which is one end of the shaft body 81 (loading of building 4 And a base 82A, 82B provided on the lower end (the end on the side of the vehicle body frame 2) which is the other end of the shaft 81. Since the base 82A provided on the upper end of the shaft 81 and the base 82B provided on the lower end have the same configuration, the base 82A provided on the upper end is taken as an example and described with reference to FIG. Do.

  As shown in FIG. 6, the base 82A is formed in a L-shaped cross section by bending a plate material, and a fixing portion 821 fixed to the mounting portion 42 of the building 4 and a shaft 81 from the fixing portion 821. And a reinforcing portion 822 extending along the direction of extension of the shaft 81 to reinforce the upper end portion of the shaft body 81.

  The mounting portion 42 of the building 4 has a region that protrudes forward relative to the pair of side plate portions 41, and the fixing portion 821 is tightened to the lower surface of the protruding region by a plurality of bolts 8A and is mounted on the mounting portion 42. It is fixed. The reinforcing portion 822 is formed such that the width (the dimension along the vehicle width direction) expands toward the fixed portion 821 side, that is, toward the bent portion. Thereby, the connection part of the left side rod-shaped member 8L and the building 4 can be firmly reinforced.

  In the base 82B provided at the lower end of the shaft 81, a plurality of fixing portions 821 are provided on the seating surface (upper surface) of the pedestal 210 provided at the front end of the pair of left and right side frames 21 of the vehicle body frame 2. It is tightened by a bolt and fixed to the vehicle body frame 2. And the reinforcement part 822 of the base | substrate 82B is reinforcing the connection part of the left side rod-shaped member 8L and the vehicle body frame 2 (base part 210). In the present embodiment, the pair of rod-like members 8L and 8R are disposed on the front side of the building 4 (the front side of the front grille 43).

  Further, in the present embodiment, as shown in FIG. 6, in the central region in the vehicle width direction of the mounting portion 42 of the building 4, the relay plate 9 extending to the vehicle body frame 2 side is integrally provided. . The relay plate 9 is formed to have an L-shaped cross section by bending a plate like the bases 82A and 82B of the pair of rod-like members 8L and 8R, and a joint portion 91 joined to the placement portion 42, And an extending portion 92 extending from the joint portion 91 toward the vehicle body frame 2 side. The extending portion 92 is in the shape of a rectangle having a long side in the vehicle width direction.

  The base 82A of the pair of rod-like members 8L and 8R has the fixing portion 821 fastened to the joint portion 91 of the relay plate 9 by the plurality of bolts 8A, and the reinforcement portion 822 is plurally attached to the extension portion 92 of the relay plate 9 , And fixed to the relay plate 9. That is, in the present embodiment, the upper end portions of the pair of rod-like members 8L and 8R are both fixed via the relay plate 9 in the central region of the mounting portion 42 in the vehicle width direction.

  Thus, the upper end portions of the pair of rod-like members 8L and 8R and the building 4 are compared as compared with the case where the upper end portions of the pair of rod-like members 8L and 8R and the mounting portion 42 of the building 4 are connected without interposing the relay plate 9 The connection with the mounting portion 42 of the In addition, since the relay plate 9 determines the fixed position of the upper end portion of the pair of rod-like members 8L and 8R by integrating the relay plate 9 into the mounting portion 42 in advance, the relay plate 9 can be used for the pair of rod-like members 8L and 8R It becomes easy to fix.

<Function of Pair of Rods 8L and 8R>
Next, the function of the pair of rod-like members 8L and 8R will be described with reference to FIG.

  FIG. 7 is a schematic front view illustrating the trolley type dump truck 1 when acceleration a in the vehicle width direction is applied.

  The trolley type dump truck 1 in which the heavy current collector 5 is placed on the building 4 has a large load on the building 4 unlike a general dump truck in which the heavy items are not placed on the roof of the building. It has become. In addition, since the building 4 is provided in front of the axle of the front wheel 3A in direct contact with the road surface and stands relatively near the front wheel 3A, the unevenness of the road surface during traveling of the trolley type dump truck 1 We are greatly affected by vibration. The “vibration” in this case includes, for example, a shake due to a twist of the vehicle body frame 2 which is generated when the trolley type dump truck 1 rides on a protruding portion on the road surface.

  When vibration occurs in the trolley type dump truck 1, the force tends to be concentrated on the connection portion Y (shown in FIG. 7) between the mounting portion 42 of the building 4 and the pantograph support 52 (the current collector 5). At this time, when the building 4 is viewed from the front side, the rectangular outer edge portion deforms into a parallelogram shape. Further, the mounting portion 42 vibrates such that the connecting portion Y becomes a fixed end and the central region of the mounting portion 42 becomes an antinode of vibration.

  For example, as shown by the arrow in FIG. 7, when acceleration a from the left side to the right side in the vehicle width direction acts on the trolley type dump truck 1 due to the unevenness of the road surface, the building 4 receives a right direction force and viewed from the front side When trying to transform into a parallelogram shape. At this time, a force is applied in the compression direction to the right side rod member 8R that inclines obliquely downward toward the right from the center in the vehicle width direction, and the left side inclines obliquely downward toward the left from the center in the vehicle width direction A force acts on the rod-like member 8L in the extension direction. Thus, the force concentrated on the connection portion Y can be dispersed to the pair of rod-like members 8L and 8R.

  As described above, the pair of rod-like members 8L and 8R inclined with respect to the vehicle height direction form a triangular structure in the rectangular outer edge portion when the building 4 is viewed from the front side, thereby providing the function of bracing Play. As a result, even when the heavy current collector 5 is placed on the building 4, the building 4 is reinforced by the pair of rod members 8L and 8R. It is possible to suppress the deformation and damage of the building 4 due to the vibration of

  Furthermore, in the present embodiment, the upper end portion of each of the pair of rod-like members 8L and 8R is fixed to the central region that can be an antinode of vibration in the mounting portion 42, and the front wheel 3A is outside the upper end portion in the vehicle width direction. The lower end portion is fixed to a pedestal portion 210 provided in the vicinity of. As described above, by fixing the portions of the building 4 and the vehicle body frame 2 that are highly susceptible to the influence of vibration with the pair of rod members 8L and 8R, deformation and damage of the building 4 are further suppressed.

  The embodiments of the present invention have been described above. The present invention is not limited to the above-described embodiment, but includes various modifications. For example, the above-described embodiment is described in detail to explain the present invention in an easy-to-understand manner, and is not necessarily limited to one having all the described configurations. Further, part of the configuration of the present embodiment can be replaced with the configuration of the other embodiment, and the configuration of the other embodiment can be added to the configuration of the present embodiment. Furthermore, with respect to a part of the configuration of the present embodiment, it is possible to add, delete, and replace other configurations.

  For example, in the above embodiment, the trolley type dump truck 1 equipped with the current collector 5 is described as a heavy load mounted dump truck. However, the trolley type dump truck need not necessarily be electrically driven. It may be a dump truck driven by

  Moreover, in the said embodiment, in order to aim at weight reduction of the trolley type dump truck 1, although a pair of rod-shaped members 8L and 8R were formed by the member of the rectangular cylinder which an inside is hollow respectively, it is not necessarily an angular cylinder It does not have to be

  Further, in the above embodiment, the pair of rod-like members 8L and 8R are fixed to the pedestal portion 210 having the lower end portion (base 82B) attached to the vehicle body frame 2, but the invention is not limited thereto. It may be directly fixed to the part which constitutes the front part side of.

  In the above embodiment, the upper end portion of the pair of rod-like members 8L and 8R is fixed to the relay plate 9 integrally provided in the mounting portion 42. However, the upper end portion does not necessarily have to be via the relay plate 9 Need not be fixed to the mounting portion 42, and may be fixed directly to the mounting portion 42.

  Further, in the above embodiment, the upper end portions of the pair of rod-shaped members 8L and 8R are fixed to the central region in the vehicle width direction of the mounting portion 42, and the lower end portions are fixed to the pedestal portion 210 of the vehicle body frame 2. However, there is no particular limitation on the fixing place of the mounting portion 42 of the pair of rod-like members 8L and 8R and the vehicle body frame 2, and the pair of rod-like members 8L and 8R obliquely connects the building 4 and the vehicle body frame 2 I hope that I can play a role as a muscle worker.

  Moreover, in the said embodiment, although a pair of rod-shaped member 8L, 8R was arrange | positioned at the front side of the building 4, it does not restrict to this, for example, is arrange | positioned at the back side (side provided with the vessel 7) of the building 4. It may be

1: Trolley type dump truck (dump truck)
2: Body frame 3F: front wheel 3R: rear wheel 4: building 5: current collector (heavy load)
8L, 8R: pair of rod-like members 9: relay plate 42: upper plate portion (mounting portion)
W: Trolley wire

Claims (5)

Body frame,
Front and rear wheels respectively attached to the body frame;
A building that defines a machine room,
And a pair of rod-like members connecting the body frame and the building,
The building is erected forward of an axle of the front wheel on the vehicle body frame, and has a mounting portion on the upper end side for mounting a heavy object,
Each of the pair of rod-like members has one end fixed to the mounting portion and the other end fixed to the vehicle body frame in a state of being inclined with respect to the vehicle height direction. . The dump truck according to claim 1, wherein
Each of the pair of rod-like members has one end fixed to the central region in the vehicle width direction in the placing portion and the other end fixed to the outer side than the one end in the vehicle width direction. Characteristic dump truck. The dump truck according to claim 2, wherein
In the central region of the mounting portion, a relay plate extending toward the vehicle body frame is integrally provided.
The dump truck according to claim 1, wherein the one ends of the pair of rod-shaped members are fixed to the relay plate. The dump truck according to claim 1, wherein
A dump truck characterized in that the pair of rod-like members are disposed on the front side of the building. The dump truck according to claim 1, wherein
The dump truck according to claim 1, wherein the dump truck is a trolley type that travels by obtaining power from a trolley wire by a current collector as the heavy load.