Dump truck

Abstract

To make a lamp clearly visible even when a driver of an oncoming vehicle views the lamp from an oblique direction.SOLUTION: An upper-side staircase 18 of a staircase 15 connected to a front part 7A of an upper deck 7 from a front side in order to access an upper deck 7 is formed by sandwiching a plurality of steps of treads 19A, 19B, 19C, arranged at intervals in a vertical direction, between a pair of stringers 20. Further, each stringer 20 is provided with a notch 21 at a position corresponding to heights of a direction indicator 9 and a side marker lamp 10 which are provided on either side of right and left sides of a front side 6A of a building 6 constituting a vehicle body 2. Thus, when a driver of an oncoming vehicle views the direction indicator 9 and the side marker lamp 10 from an oblique direction, the direction indicator 9 and the side marker lamp 10 can be clearly visually recognized by the driver of the oncoming vehicle through the notch 21.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a dump truck that is suitably used for transporting, for example, crushed stone excavated in a mine. [Background technology]

[0002] Extra-large dump trucks called mining dump trucks are used for transporting crushed rock and other materials extracted from mines. These dump trucks have a vehicle body consisting of a vehicle frame that extends in the front-rear direction and forms a support structure, and left and right front wheels and left and right rear wheels that are attached to the vehicle frame, and a loading platform is mounted on the vehicle body for loading crushed rock and other materials. A deck is provided on the front upper part of the vehicle body, and a cab is mounted on the deck.

[0003] A staircase is provided at the front of the car body for access to the deck (Patent Document 1). The staircase is formed by sandwiching multiple steps spaced apart in the vertical direction between a pair of side beams. In addition, lamps required for traveling, such as turn signals, width lamps, and headlights, are provided on both the left and right sides of the front of the car body at a high position near the deck (Patent Document 2).

[0004] Here, at mining sites such as large-scale mines, trolley-type dump trucks are used, which drive electric motors for traveling with electricity supplied through trolley wires (overhead lines) stretched above. These trolley-type dump trucks are equipped with a current collector on the front of the vehicle body that collects electricity from the trolley wires (Patent Document 1).

[0005] In a trolley-type dump truck, the support structure for the current collector is disposed at the front of the vehicle body, so the stairs are connected to the front part of the deck from the front side, avoiding the support structure for the current collector. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2013-074678 A [Patent Document 2] JP 2017-215820 A Summary of the Invention [Problem to be solved by the invention]

[0007] In the dump truck of Patent Document 1, a staircase formed by sandwiching multiple treads between a pair of side girders is connected to the deck on the upper part of the vehicle body from the front side. On the other hand, in the dump truck of Patent Document 2, lamps such as turn signals, vehicle width lights, and headlights are arranged in a high position on the front of the vehicle body, i.e., near the staircase.

[0008] Therefore, when the stringers of the stairs are placed near a lamp, there is a problem that when a driver of an oncoming vehicle looks at the lamp from an angle, the stringers of the stairs get in the way and make it difficult for the driver to see the lamp.

[0009] The present invention has been made in consideration of the problems with the conventional technology described above, and an object of the present invention is to provide a dump truck that allows the driver of an oncoming vehicle to clearly see the lamp even when looking at the lamp from an angle. [Means for solving the problem]

[0010] The present invention relates to a dump truck comprising a vehicle body, a deck provided at the front of the vehicle body and on which a cab is mounted, ramps provided on both the left and right sides of the front of the vehicle body at positions corresponding to the height of the deck, and a staircase connected to the front part of the deck from the front side for accessing the deck, the staircase being formed by sandwiching multiple step boards spaced apart in the vertical direction between a pair of side girders, and the side girders being provided with either a hole or a notch at a position corresponding to the height of the ramp. Effect of the Invention

[0011] According to the present invention, even if a driver of an oncoming vehicle looks at the lamp from an oblique angle, the lamp can be clearly seen without being obstructed by the stringers of the stairs. [Brief description of the drawings]

[0012] [Figure 1] 1 is a front view showing a dump truck according to a first embodiment of the present invention. [Diagram 2] This is an enlarged perspective view showing the left portion of the upper deck, turn signals, vehicle width lights, stairs, cutouts, etc. [Diagram 3] A cross-sectional view showing the front part of the upper deck, turn signals, stairs, cutouts, etc. [Figure 4] FIG. 11 is a cross-sectional view showing a round hole according to a second embodiment of the present invention, together with the front part of the upper deck, directional indicators, stairs, etc. [Diagram 5] FIG. 11 is a cross-sectional view showing a slot according to a third embodiment of the present invention together with the front part of the upper deck, directional indicators, stairs, etc. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, a dump truck according to an embodiment of the present invention will be described in detail with reference to the attached drawings. In this embodiment, the dump truck is an extra-large dump truck for transporting, for example, crushed rocks excavated in a mine, and is a trolley-type dump truck equipped with a battery device for storing power for driving an electric motor for traveling, and a current collector device for supplying power drawn from an overhead line to the battery device. In the embodiment, the traveling direction of the dump truck is described as the front-rear direction, and the direction perpendicular to the traveling direction is described as the left-right direction.

[0014] 1 to 3 show a first embodiment of the present invention. In FIG. 1, a dump truck 1 includes a self-propelled vehicle body 2 equipped with left and right front wheels 3 and left and right rear wheels 4, and a loading platform 5 mounted on the vehicle body 2 so as to be tiltable (raised and lowered). The dump truck 1 transports crushed rock and other materials excavated in a mine by loading them onto the loading platform 5. The left and right rear wheels 4 are driven by a traveling device (not shown) equipped with an electric motor. The loading platform 5 is tilted up and down by a hoist cylinder (not shown), so that the loaded crushed rock and other materials can be unloaded to the rear.

[0015] In addition, a lower left deck 2A and a lower right deck 2B are provided on the front side of the car body 2. The lower left deck 2A and the lower right deck 2B are provided at a low position (close to the ground) of the car body 2. The upper surfaces of the lower left deck 2A and the lower right deck 2B form landings on the way to access (go up, go down, etc.) the car body 2. The lower right deck 2B is connected to the lower part of a lower staircase 16 of a staircase 15 described later.

[0016] The building 6 constitutes the front portion of the vehicle body 2. The building 6 is formed in a box shape surrounded by a front surface 6A, left and right side surfaces, a top surface, etc., and contains, for example, an engine, a generator, a hydraulic pump, a battery device, etc. (none of which are shown). In addition, the front surface 6A of the building 6 is provided with direction indicators 9, width lights 10, etc., which will be described later.

[0017] The upper deck 7, which serves as a deck, is located forward of the loading platform 5 and provided on the upper side of the building 6. The upper deck 7 is formed as a rectangular flat plate that is long in the left-right direction. A cab 8 and the like are mounted on the upper deck 7. In addition, an upper staircase 18 of a staircase 15, which will be described later, is connected from the front side to the left side position in front of the cab 8 in the front part 7A of the upper deck 7.

[0018] The cab 8 is provided on the left side on the upper deck 7. The cab 8 forms a cab in which an operator of the dump truck 1 rides. Inside the cab 8, a driver's seat, a steering wheel, an accelerator pedal, a brake pedal, a plurality of operating levers, switches, etc. (none of which are shown) are provided.

[0019] The turn indicators 9 and the width lights 10 constitute lamps and are provided on the front 6A of the building 6 of the car body 2. The turn indicators 9 and the width lights 10 are located at a position corresponding to the height of the upper deck 7 on the front 6A of the building 6 of the car body 2, in other words, at the top of the front 6A, and are arranged apart at the left and right ends. As shown in FIG. 2, the left turn indicator 9 is arranged near the left side of an upper staircase 18 described later, and the left width light 10 is arranged next to the left of the left turn indicator 9 (outside in the left and right directions). The right turn indicators 9 and width lights 10 are arranged next to the right end so as to be symmetrical with the left turn indicators 9 and width lights 10.

[0020] Thus, the turn indicators 9 and the width lights 10 are provided on both the left and right sides of the front surface 6A. The turn indicators 9 can flash to indicate the traveling direction of the dump truck 1. Also, the width lights 10 can be turned on to allow the surroundings to recognize the width of the dump truck 1 even at night.

[0021] The pantograph support 11 is arranged at intervals in the front-rear and left-right directions and includes a plurality of support columns 11A extending in the up-down direction and left and right current collector mounting bases 11B extending outward in the left-right direction from the upper part of each support column 11A. The pantograph support 11 is arranged in the center in the left-right direction of the car body 2. For this reason, the upper staircase 18 of the staircase 15 is provided so as to connect to the left end of the upper deck 7 from the front side so as to avoid the central pantograph support 11. In addition, the current collectors 12 described below are attached on the left and right current collector mounting bases 11B.

[0022] The left and right current collectors 12 are provided at the front of the building 6 constituting the vehicle body 2. The left and right current collectors 12 are attached on the left and right current collector mounting bases 11B of the pantograph support 11. The current collector 12 collects electricity from an overhead line (not shown) stretched over the track (traffic line) of the dump truck 1 in a mine or the like, and supplies it to an electric motor of the traveling gear. The current collector 12 includes a pantograph 13 that is provided between the pantograph support 11 and the overhead line so as to be able to rise and fall (extend and retract), and a current collector 14 that is provided above the pantograph 13 and slides against the overhead line as the pantograph 13 extends to collect electricity.

[0023] Next, the configuration of the staircase 15 used in this embodiment will be described in detail.

[0024] The stairs 15 are provided on the front side of the car body 2, specifically, on the front surface 6A of the building 6. The stairs 15 are used when accessing between the ground and the upper deck 7, and are provided between the lower right deck 2B and the upper deck 7. In order to avoid the pantograph support 11, the stairs 15 consists of a lower staircase 16, an intermediate deck 17, and an upper staircase 18, and the upper staircase 18 is provided with a notch 21.

[0025] The lower staircase 16 is provided between the lower right deck 2B and the middle height of the building 6. The lower staircase 16 extends obliquely upward from the right side, which is the lower right deck 2B side, to the left side, which is the cab 8 side. Similar to the upper staircase 18 described below, the lower staircase 16 is formed by sandwiching multiple steps of treads spaced apart in the vertical direction between a pair of stringers.

[0026] The intermediate deck 17 is provided at an intermediate height position of the building 6. The intermediate deck 17 is formed as a rectangular passage (landing) extending in the left-right direction, avoiding each of the pillars 11A of the pantograph support 11. The upper part of the lower staircase 16 is connected to the right part of the intermediate deck 17 from the right side.

[0027] As shown in Figures 2 and 3, the upper staircase 18 is provided between the intermediate deck 17 and the upper deck 7. The upper staircase 18 is disposed on the left side of the pantograph 13, i.e., at the left end of the car body 2, so as to be able to avoid the pantograph support 11. Specifically, the upper staircase 18 extends upward from the left end of the intermediate deck 17 while inclining rearward, and its upper portion is connected to the front part 7A of the upper deck 7 from the front side. As a result, the upper staircase 18 is disposed near the right side of the direction indicator 9 and width light 10 located on the left side.

[0028] The upper staircase 18 is composed of multiple steps, for example, three treads 19A, 19B, and 19C, arranged at intervals in the vertical direction, and a pair of side beams 20 on the left and right sides that sandwich the three treads 19A, 19B, and 19C. The three treads 19A, 19B, and 19C are formed as rectangular plates that are long in the horizontal direction.

[0029] The pair of side girders 20 are formed as J-shaped flat plates consisting of a vertical plate portion 20A extending upward from the intermediate deck 17 at the position (front position) of the lower step 19A, and a slanted plate portion 20B extending diagonally rearward from the upper portion of the vertical plate portion 20A. Between the vertical plate portions 20A of the pair of side girders 20, the lower step 19A is sandwiched at a position spaced upward from the intermediate deck 17. In addition, between the slanted plate portions 20B, the middle step 19B and the upper step 19C are sandwiched. The middle step 19B is positioned at a position spaced upward from the lower step 19A, and the upper step 19C is positioned at a position spaced upward from the middle step 19B.

[0030] Here, the upper portions of the swash plate portions 20B of the pair of side girders 20 are attached to the front portion 7A of the upper deck 7. In addition, the upper edge 20C of the swash plate portion 20B extends to a position higher than the direction indicators 9 and the vehicle width lights 10 in the normal state shown by the two-dot chain line in Fig. 3. However, in this embodiment, the upper edge 20C of the swash plate portion 20B ends at a position lower than the direction indicators 9 and the vehicle width lights 10 because a notch 21 described later is provided at the upper portion.

[0031] The notches 21 are provided in the upper portions of the pair of side beams 20 that constitute the upper staircase 18. The notches 21 are disposed at positions corresponding to the heights of the turn signals 9 and the side lights 10. Specifically, the notches 21 are formed as triangular cutout portions, taking into consideration the extension portion of the upper edge 20C indicated by the two-dot chain line in FIG.

[0032] The lower position 21A of the cutout 21 (the upper position of the slanted plate portion 20B) is set to a position higher than the upper step 19C, which is the top step, and lower than the upper deck 7. Therefore, the cutout 21 is formed to a position lower than the turn indicators 9 and the width lights 10, which are at a position equivalent to the height of the upper deck 7. As a result, when the driver of an oncoming vehicle of the dump truck 1 looks at the turn indicators 9 and width lights 10 of the dump truck 1 from an oblique angle, the driver can see the turn indicators 9 and width lights 10 without being obstructed by the side beam 20 of the upper staircase 18.

[0033] The dump truck 1 according to this embodiment has the configuration as described above. Next, a case where the dump truck 1 is used to transport excavated crushed stone or the like will be described.

[0034] First, the operator ascends to the lower right deck 2B of the car body 2, then ascends to the upper deck 7 via the lower staircase 16 of the stairs 15, the middle deck 17, and the upper staircase 18, and gets into the cab 8. Once in the cab 8, the operator operates various switches to extend the pantograph 13 of the current collector 12, and brings the current collector boat 14 into contact with the overhead wires stretched over the track (traffic line) of the mine or the like.

[0035] Once the current collector 12 is in contact with the overhead line, the operator operates the steering wheel, accelerator pedal, brake pedal, etc. As a result, the electric motor of the traveling gear of the dump truck 1 is driven by power from the overhead line, and the dump truck 1 can travel to the mining site. At this mining site, crushed rocks and the like excavated by a hydraulic excavator (not shown) are loaded onto the loading platform 5. Once the crushed rocks and the like are loaded onto the loading platform 5, the operator again operates the steering wheel, accelerator pedal, brake pedal, etc. to drive the dump truck 1 to the loading site, and unloads the loaded crushed rocks and the like at the loading site.

[0036] In addition, when the dump truck 1 is traveling, when turning right or left or when changing driving lanes, the left or right turn indicator 9 is flashed to inform surroundings of the traveling direction of the dump truck 1. Furthermore, when working at night, the width of the dump truck 1 can be made known to surroundings by turning on the vehicle width lights 10.

[0037] Here, upper stairs 18 of stairs 15 are arranged near the right side of the left turn signal 9 and width light 10. Therefore, when a driver of an oncoming vehicle looks at the turn signal 9 and width light 10 from an oblique angle, there is a risk that the upper stairs 18 will get in the way and make it difficult for the driver to see the turn signal 9 and width light 10.

[0038] However, according to this embodiment, the upper staircase 18 of the staircase 15 connected from the front side to the front part 7A of the upper deck 7 in order to access the upper deck 7 is formed by sandwiching a plurality of steps 19A, 19B, 19C spaced apart in the vertical direction between a pair of side girders 20. In addition, the side girders 20 are provided with notches 21 at positions corresponding to the heights of the direction indicators 9 and the width lights 10 provided on both the left and right sides of the front surface 6A of the building 6 constituting the car body 2.

[0039] As a result, when a driver of an oncoming vehicle looks at the direction indicator 9 and the vehicle width lamp 10 from an oblique angle, the cutout 21 enables the driver of the oncoming vehicle to clearly see the direction indicator 9 and the vehicle width lamp 10.

[0040] The car body 2 is also provided with a current collector 12 consisting of a pantograph 13 that can be raised and lowered, and a current collector 14 that is provided on the pantograph 13 and collects power by sliding against an overhead line stretched above the car body 2. A staircase 15 is connected to the upper deck 7 on either the left or right side of the pantograph 13 (the left side in this embodiment). As a result, in this embodiment, the electric motor of the traveling device is driven by the power collected from the overhead line by the current collector 12, and the dump truck 1 can travel. Even with the dump truck 1 equipped with the pantograph 13, the direction indicators 9 and vehicle width lights 10 can be clearly seen by the driver of an oncoming vehicle.

[0041] In addition, the lower position 21A of the cutout 21 is set to a position higher than the upper step 19C, which is the top step, and lower than the upper deck 7. As a result, the cutout 21 can remove only the upper part of the stringer 20, which gets in the way when viewing the direction indicators 9 and the vehicle width lights 10, and the strength of the upper staircase 18 can be maintained.

[0042] Furthermore, the notches 21 are provided in both of the pair of side girders 20. This allows the driver of an oncoming vehicle to see the direction indicators 9 and the vehicle width lights 10 without being obstructed by the side girders 20 even when approaching the dump truck 1.

[0043] Next, Fig. 4 shows a second embodiment of the present invention. The second embodiment is characterized in that a round hole is provided in the side beam at a position corresponding to the height of the lamp. In the second embodiment, the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted.

[0044] In FIG. 4, the staircase 31 according to the second embodiment includes the lower staircase 16, the intermediate deck 17, and the upper staircase 32 and the round hole 35 described below. The upper staircase 32 according to the second embodiment is formed by sandwiching three steps of treads 33A, 33B, and 33C between a pair of side beams 34 (only the left side is shown) like the upper staircase 18 according to the first embodiment. The side beam 34 according to the second embodiment has a vertical plate portion 34A and a slanted plate portion 34B like the side beam 20 according to the first embodiment. However, the side beam 34 according to the second embodiment is different from the side beam 20 according to the first embodiment in that the upper edge 34C of the side beam 34 extends upward beyond the upper deck 7, the direction indicator 9, and the vehicle width light 10. As a result, the upper part of the side beam 34 is formed in a triangular shape above the top step 33C.

[0045] A plurality of round holes 35 are provided in the upper part of a pair of side beams 34 constituting the upper staircase 32. The round holes 35 are arranged at positions corresponding to the height of the turn signals 9 and the width lights 10. The round holes 35 are set to a size, interval, and number such that the light emitted by the turn signals 9 and width lights 10 can be visually recognized from the opposite side (right side) across the side beam 34.

[0046] The lower position 35A of the round holes 35 (the position of the lowest round hole 35) is set at a position higher than the upper step 33C, which is the top step, and lower than the upper deck 7. Therefore, the multiple round holes 35 are formed to a position lower than the turn indicators 9 and width lights 10, which are at a position equivalent to the height of the upper deck 7. As a result, when the driver of an oncoming vehicle of the dump truck 1 looks at the turn indicators 9 and width lights 10 of the dump truck 1 from an oblique angle, the driver can see the turn indicators 9 and width lights 10 through the multiple round holes 35 without being obstructed by the side beams 34 of the upper staircase 32.

[0047] Thus, the second embodiment configured as above can achieve the same effects and advantages as the first embodiment. In particular, in the second embodiment, the round holes 35 can be formed simply by drilling the side girders 34, which can reduce costs.

[0048] Next, Fig. 5 shows a third embodiment of the present invention. The third embodiment is characterized in that the stringer is provided with a long hole at a position corresponding to the height of the ramp. In the third embodiment, the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted.

[0049] In FIG. 5, the staircase 41 according to the third embodiment includes the lower staircase 16, the intermediate deck 17, and the upper staircase 42 and the long hole 45 described below. The upper staircase 42 according to the third embodiment is formed by sandwiching three steps of treads 43A, 43B, and 43C between a pair of side beams 44 (only the left side is shown) like the upper staircase 18 according to the first embodiment. The side beam 44 according to the third embodiment has a vertical plate portion 44A and a slanted plate portion 44B like the side beam 20 according to the first embodiment. However, the side beam 44 according to the third embodiment is different from the side beam 20 according to the first embodiment in that the upper edge 44C of the side beam 44 extends upward beyond the upper deck 7, the direction indicator 9, and the vehicle width lamp 10. As a result, the upper part of the side beam 44 is formed in a triangular shape above the top step 43C.

[0050] The long holes 45 as holes are provided in the upper part of a pair of side beams 44 constituting the upper staircase 42. The long holes 45 are slits extending in the up-down direction, and a plurality of long holes (for example, three long holes) are provided at intervals in the front-rear direction. The long holes 45 are arranged at positions corresponding to the height of the turn signals 9 and the width lights 10. The long holes 45 are set to a size (width, length), interval, and number such that the light emitted by the turn signals 9 and width lights 10 can be visually recognized from the opposite side (right side) across the side beam 44. The long holes can also be formed to extend in the front-rear direction (lateral direction).

[0051] The lower position 45A of the long hole 45 is set at a position higher than the upper step 43C, which is the top step, and lower than the upper deck 7. Therefore, the multiple long holes 45 are formed to a position lower than the turn indicators 9 and width lights 10, which are at a position equivalent to the height of the upper deck 7. As a result, when the driver of an oncoming vehicle of the dump truck 1 looks at the turn indicators 9 and width lights 10 of the dump truck 1 from an oblique angle, the driver can see the turn indicators 9 and width lights 10 through the multiple long holes 45 without being obstructed by the side beams 44 of the upper staircase 42.

[0052] Thus, the third embodiment thus configured can also achieve the same effects and advantages as the first embodiment. In particular, in the third embodiment, the slit-shaped long holes 45 are provided, so that the visible range can be widened and the visibility of the direction indicators 9 and the vehicle width lights 10 can be improved.

[0053] In the first embodiment, an example is described in which the notches 21 are provided in both of the pair of side girders 20. However, the present invention is not limited to this, and for example, the notch 21 may be provided only in the left side girders 20 that are located near the direction indicators 9 and the vehicle width lights 10. This configuration can be similarly applied to the other embodiments.

[0054] In the first embodiment, the lamps are exemplified as the direction indicators 9 and the vehicle width lights 10. However, the present invention is not limited to this, and for example, headlights and rotating lights may also be used as the lamps. [Explanation of symbols]

[0055] 1. Dump truck 2. Body 6 Building 6A front 7 Upper Deck (Deck) 8. Cab 9 Direction indicators (lamps) 10 Parking lights (lamps) 12 Current collector 13 Pantograph 14 Current collector boat 15, 31, 41 steps 18, 32, 42 upper steps 19A, 19B, 19C, 33A, 33B, 33C, 43A, 43B, 43C pedals 20, 34 side girders 21 notch 21A, 35A, 45A lower positions 35 round holes 45 oblong holes

Claims

1. The car body and A deck provided at the front side of the vehicle body and on which a cab is mounted; Lamps provided at positions corresponding to the height of the deck on both the left and right sides of the front surface of the vehicle body; a staircase forwardly connected to the front of the deck for accessing the deck; In a dump truck comprising: The staircase is formed by sandwiching a plurality of steps of treads arranged at intervals in the vertical direction between a pair of stringers, The dump truck is characterized in that the side girder is provided with either a hole or a notch at a position corresponding to the height of the ramp.

2. The dump truck according to claim 1, A dump truck characterized in that a lower position of the hole or notch is set at a position higher than an uppermost step among the plurality of steps of step plates and lower than the deck.

3. The dump truck according to claim 1, The dump truck is characterized in that the hole or the notch is provided in both of the pair of side girders.

4. The dump truck according to claim 1, The car body is provided with a current collecting device including a pantograph that can be raised and lowered, and a current collecting shoe that is provided on the pantograph and slides against an overhead wire that is stretched above the car body to collect electric power, The dump truck is characterized in that the staircase is connected to the deck from either the left or right side of the pantograph.

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