JP2015112907A - Dump truck and cargo bed thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dump truck in which a cargo bed temperature can be controlled to a desired temperature, and a cargo bed thereof.SOLUTION: A dump truck is provided which comprises a vehicle body (2), an engine (5) for driving the vehicle body, and a cargo bed (6) mounted on the vehicle body so as to be derricked, and in which the cargo bed includes: an introduction port (11) for introducing exhaust gas from the engine; a main exhaust port (19) and a sub exhaust port (20) for discharging the exhaust gas; a main channel through which the exhaust gas flows from the introduction port to the main exhaust port; and a sub channel that is branched from the main channel and introduces the exhaust gas to the sub exhaust port; and a flow control mechanism (25) that controls the flow rate of the exhaust gas and is provided in at least one of the sub channel and a part of the main channel on the main exhaust port side from the branch point to the sub channel.

Description

  The present invention relates to a dump truck driven by an engine and a loading platform thereof.

  A dump truck loads a load such as earth and sand or ore on a loading platform, transports it to a desired position, and then lowers the loading by tilting the loading platform. However, loads such as earth and sand often contain moisture and may remain attached to the loading platform. In view of this, a method is known in which the cargo bed is heated by flowing exhaust gas through the interior space of the cargo bed, and the cargo is easily evaporated by evaporating the moisture in the cargo (see Patent Document 1).

Japanese Patent No. 5153927

  There are many areas where dump trucks operate, and there are large differences in the outside air temperature. Furthermore, even in the same region, the outside air temperature used may vary greatly depending on the season. However, in the technique described in Patent Document 1, since the amount of heat applied to the loading platform is constant, the loading platform may be overheated or may not be heated sufficiently depending on the operation site or season. If it cannot be heated sufficiently, it will not be possible to prevent adhesion of earth and sand, and if it is heated too much, there is a concern that the life of parts such as rubber that is easily affected by heat around the loading platform will be reduced and the coating will be easily peeled off.

  This invention is made | formed in view of the above-mentioned actual condition, The objective is to provide the dump truck which can adjust a loading platform to desired temperature, and its loading platform.

  In order to achieve the above object, the present invention provides a dump truck comprising a vehicle body, an engine that drives the vehicle body, and a cargo bed that is attached to the vehicle body in a undulating manner, and the cargo bed includes the engine. An exhaust port for introducing the exhaust gas, a main exhaust port and a sub exhaust port for exhausting the exhaust gas, a main flow path through which the exhaust gas flows from the introduction port to the main exhaust port, and a branch from the main flow path A sub-flow path that guides the exhaust gas to the sub-discharge port, and a portion of the main flow channel that is closer to the main discharge port than a branch point with the sub-flow channel, and of the sub-flow channel At least one of them is provided with a flow rate adjusting mechanism for adjusting the flow rate of the exhaust gas.

  According to the present invention, the amount of heat applied to the cargo bed can be adjusted by adjusting the flow rate of the exhaust gas of the engine flowing through the cargo bed using the flow rate adjusting mechanism. Therefore, if the flow rate adjusting mechanism is appropriately adjusted according to the operation site, the loading platform can be adjusted to a desired temperature. Thereby, it can prevent that the heating part of a carrier becomes high temperature more than necessary, and it can prevent that the components which are easily affected by the coating of the heating part and the vicinity of the heating part are deteriorated or failed at an early stage.

  Further, the present invention is characterized in that, in the above configuration, the flow rate adjusting mechanism includes a slide plate that is slidably provided at the sub discharge port and that can adjust an opening area of the sub discharge port according to a slide position. It is said. According to the present invention, the amount of heat input can be adjusted steplessly only by adjusting the position of the slide plate.

  Moreover, the present invention is characterized in that, in the above-mentioned configuration, the flow rate adjusting mechanism includes an orifice plate provided at the sub-discharge port for adjusting an opening area of the sub-discharge port. According to the present invention, the amount of heat input can be easily adjusted simply by attaching an orifice plate having an arbitrary hole diameter.

  In order to achieve the above object, the present invention provides a cargo bed used for a dump truck driven by an engine, wherein the cargo bed has an inlet for introducing exhaust gas of the engine and a main exhaust for discharging the exhaust gas. An outlet and a sub-discharge port; a main flow channel through which the exhaust gas flows from the introduction port to the main discharge port; and a sub-flow channel that branches from the main flow channel and guides the exhaust gas to the sub-discharge port. The flow path adjustment mechanism for adjusting the flow rate of the exhaust gas is provided in at least one of the main flow path from the branch point of the main flow path with respect to the sub flow path and the sub flow path. It is characterized by being.

  According to the present invention, the amount of heat applied to the cargo bed can be adjusted by adjusting the flow rate of the exhaust gas of the engine flowing through the cargo bed using the flow rate adjusting mechanism. Therefore, if the flow rate adjusting mechanism is appropriately adjusted according to the operation site, the loading platform can be adjusted to a desired temperature. Thereby, it can prevent that the heating part of a carrier becomes high temperature more than necessary, and it can prevent that the components which are easily affected by the coating of the heating part and the vicinity of the heating part are deteriorated or failed at an early stage.

  According to the present invention, since the flow rate of the exhaust gas of the engine flowing through the cargo bed can be adjusted using the flow rate adjusting mechanism, the cargo bed can be adjusted to a desired temperature. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is a side view of the dump truck concerning the embodiment of the present invention. FIG. 2 is a schematic perspective view showing a state in which the loading platform is raised in the dump truck shown in FIG. 1. It is the perspective view which looked at the loading platform shown in FIG. 2 from diagonally downward. It is a principal part enlarged view of the loading platform shown in FIG. It is a principal part enlarged view which shows the state which removed the one part board of the loading platform shown in FIG. FIG. 4 is a top view of the loading platform shown in FIG. 3. It is detail drawing (1) of the sub discharge port periphery using the flow volume adjustment mechanism which concerns on Example 1. FIG. It is detail drawing (2) of the sub discharge port periphery using the flow volume adjustment mechanism which concerns on Example 1. FIG. It is detail drawing (3) around the sub discharge port using the flow volume adjustment mechanism which concerns on Example 1. FIG. It is detail drawing (1) of the sub discharge port periphery using the flow volume adjustment mechanism which concerns on Example 2. FIG. It is detail drawing (2) of the sub discharge port periphery using the flow volume adjustment mechanism which concerns on Example 2. FIG.

  Hereinafter, a dump truck and its loading platform according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view of the dump truck. The dump truck 1 includes a self-propelled vehicle body 2, a loading platform 6 supported by the vehicle body 2 so as to be able to rise and fall, and a hoist cylinder for discharging the sediment by raising the loading platform 6 with respect to the vehicle body 2. 9 is roughly constituted. At the rear end of the vehicle body 2, a loading platform support bracket 7 is provided for rotatably supporting the loading platform 6. The bottom side of the loading platform 6 is supported by the loading platform support bracket 7 of the vehicle body 2 using the support shaft 8, and the hoist cylinder 9 is extended and the loading platform 6 is erected to quickly drop the load such as earth and sand to a desired place. Can do.

  Further, left and right front wheels 3 are rotatably provided on the front side of the vehicle body 2, and left and right rear wheels 4 are rotatably provided on the rear side of the vehicle body 2. When traveling the dump truck, the rear wheel 4 can be driven by the output of the engine 5 mounted on the front side of the vehicle body 2 to move the dump truck 1 to a desired location.

  FIG. 2 is a perspective view schematically showing a state in which the loading platform 6 of the dump truck 1 is raised. Exhaust gas discharged from the engine 5 flows through the exhaust pipe 10 to an exhaust gas inlet (introduction port) 11 provided at the bottom of the loading platform 6.

  FIG. 3 is a perspective view of the loading platform 6, FIG. 4 is an enlarged view of a main portion of the loading platform 6, and FIG. 5 is an enlarged view of a main portion showing a state in which a part of the plate of the loading platform 6 is removed. The loading platform 6 includes a bottom plate 12 that forms a bottom portion, a front plate 13 that is located on the front side of the bottom plate 12 and that forms a front surface, and a right side plate 14 and a left side plate 15 that are located on the left and right sides of the bottom plate 12. It has an open box shape. And the space inside the loading platform 6 becomes a loading section for storing earth and sand. In order to increase the rigidity of the bottom plate 12, a plurality of stiffeners 16 extending in the left-right direction are attached to the lower surface of the bottom plate 12 at intervals in the front-rear direction. Each stiffener 16 is a structure made of channel steel.

  As shown in FIG. 4, the exhaust gas that has reached the exhaust gas inlet 11 bridges the bottom plate 12, the two stiffeners 16 disposed so as to sandwich the exhaust gas inlet 11, and the two stiffeners 16. Flows through a space 18 (see FIG. 5), which is a flow path formed by a plate 17 arranged so as to cover the space between the book stiffeners 16, and in the right side in FIG. ).

  The space 18 and the internal space of the stiffener 16 communicate with each other through a hole (not shown) provided on the side surface of the stiffener 16, and a part of the exhaust gas introduced from the exhaust gas inlet 11 is not the space 18 but the stiffener. 16 flows to the right in FIG. Next, the route through which the exhaust gas flows will be described. FIG. 6 is a top view of the loading platform 6 and shows the route of the exhaust gas. As shown in FIG. 6, the exhaust gas that has reached the left end of the loading platform 6 flows clockwise through the hole 29 along the edge of the bottom plate 12 of the loading platform 6 toward the main discharge port 19, and the exhaust gas from the hole 29. It is divided into the one which goes to the discharge port 20. Therefore, the hole 29 serves as a branch point for the exhaust gas to flow into the main exhaust port 19 and the sub exhaust port 20.

  First, the main flow path through which the exhaust gas flows to the main outlet 19 will be described in detail. As shown in FIG. 6, most of the exhaust gas flows from the exhaust gas inlet 11 in the direction of arrow A, and is surrounded by the left corner plate 22, the left side plate 15, and the bottom plate 12 from the hole 29 provided in the bottom plate 12. Flow into the confined space. And exhaust gas flows toward the front direction (arrow B direction) of the loading platform 6 in the said space. The exhaust gas that has reached the space surrounded by the front corner plate 21, the bottom plate 12, and the front plate 13 flows in the right direction (arrow C direction) of the loading platform 6.

  Exhaust gas that has reached the space surrounded by the right corner plate 23, the bottom plate 12, and the right side plate 14 flows backward (in the direction of arrow D) of the loading platform 6 and from the main discharge port 19 that is a substantially rectangular opening. Released into the atmosphere. In this way, the exhaust gas flows under each corner plate and heats each corner plate, so that it is possible to prevent the earth and sand from adhering to the corner portion where the earth and sand easily adhere. Note that the exhaust gas flow path formed by ABCD in FIG. 6 corresponds to the “main flow path” of the present invention.

  Next, the auxiliary flow path through which the exhaust gas flows to the auxiliary outlet 20 will be described in detail. A portion of the exhaust gas that flows from the exhaust gas inlet 11 through the space 18 (FIG. 5) and passes through the hole 29 as a branch point flows through the exhaust box 24 (FIG. 5) and behind the loading platform 6 where the auxiliary exhaust port 20 is located. It flows in the direction (arrow E direction) and is discharged to the atmosphere from the sub discharge port 20 which is a substantially rectangular opening. The exhaust box 24 is located below the left corner plate 22 of the loading platform 6 and plays a role of preventing the adhesion of earth and sand by heating the left corner plate 22 with the exhaust gas flowing through the exhaust box 24. The exhaust gas flow path formed by AE in FIG. 6 corresponds to the “sub-flow path” of the present invention.

  Next, the flow rate adjusting mechanism provided in the sub discharge port 20 will be described with reference to two typical examples.

"Example 1"
7 to 9 are detailed views of the auxiliary outlet 20 and its surroundings. As shown in these drawings, in the first embodiment, an adjustment plate (slide plate) 25 slidably provided at the sub-discharge port 20 is used as the exhaust gas flow rate adjustment mechanism. The adjustment plate 25 is configured to slide in the in-plane direction of the sub discharge port 20, and the opening area 26 (area shown by hatching in the drawing) is arbitrarily adjusted according to the slide position of the adjustment plate 25. can do.

  The adjustment plate 25 is provided with a long hole 27, and the adjustment plate 25 can be fixed at an arbitrary slide position by a bolt 28. For example, if the opening area 26 is set large as shown in FIG. 7, the flow rate of the exhaust gas discharged from the sub-discharge port 20 increases, and therefore the flow rate of the exhaust gas flowing to the main discharge port 19 decreases. As a result, the amount of heat input to the loading platform 6 can be reduced. Conversely, if the opening area 26 is set small as shown in FIG. 8 or FIG. 9, the flow rate of the exhaust gas flowing to the main exhaust port 19 increases, and the amount of heat input to the cargo bed 6 can be increased. Therefore, the loading platform 6 can be heated to a desired temperature regardless of the operation site of the dump truck 1.

  Further, by making the opening area variable, it is possible to adjust the exhaust pressure loss. Therefore, even if the vehicle body has a different required value of exhaust pressure loss, the same cargo bed 6 can be mounted on various vehicle bodies by adjusting the opening area 26 of the sub-discharge port 20.

"Example 2"
10 to 11 are detailed views of the auxiliary discharge port 20 and its surroundings. As shown in these drawings, in the second embodiment, orifice plates 30 and 31 are used as an exhaust gas flow rate adjusting mechanism. The orifice plates 30 and 31 have different hole diameters. In this manner, by attaching an orifice plate having an arbitrary hole diameter to the sub discharge port 20, the flow rate of exhaust gas discharged from the sub discharge port 20 can be adjusted. Therefore, also in this embodiment, the loading platform 6 has a desired temperature regardless of the operation site of the dump truck 1. The orifice plates 30 and 31 are fixed to the sub discharge port 20 by bolts 28.

  As described above, according to the above-described embodiment, the loading platform 6 can be adjusted to a desired temperature according to the use environment of the dump truck. Thereby, it is possible to prevent earth and sand from adhering to the loading platform 6, to prevent a decrease in the service life of components such as rubber, and to prevent deterioration of the coating.

  In addition, embodiment mentioned above is an illustration for description of this invention, and is not the meaning which limits the scope of the present invention only to those embodiment. Those skilled in the art can implement the present invention in various other modes without departing from the spirit of the present invention.

  For example, the adjustment plate 25 or the orifice plates 30 and 31 can be provided at the main discharge port 19. Even if comprised in this way, since the exhaust gas flow rate can be adjusted, the loading platform 6 can be adjusted to a desired temperature. Further, the adjustment plate 25 or the orifice plates 30 and 31 can be provided at both the main discharge port 19 and the sub discharge port 20. In this case, the same one may be attached to both the main discharge port 19 and the sub discharge port 20, or the adjustment plate 25 may be provided on one side and the orifice plates 30 and 31 on the other side.

  Further, the present invention is not limited to the configuration in which the flow rate of the exhaust gas is adjusted by adjusting the opening area of the main discharge port 19 or the sub discharge port 20, and a mechanism capable of restricting the flow rate is provided in the middle of the main flow channel or the sub flow channel. However, the same effect as the above embodiment can be obtained.

1 Dump truck 2 Car body 5 Engine 6 Loading platform 11 Exhaust gas inlet (inlet)
19 Main outlet 20 Sub outlet 25 Adjustment plate (slide plate)
30, 31 Orifice plate A-B-C-D Main flow path AE Sub flow path

Claims (4)

A dump truck comprising a vehicle body, an engine that drives the vehicle body, and a cargo bed that is attached to the vehicle body in a undulating manner,
The loading platform includes an inlet for introducing the exhaust gas of the engine, a main exhaust port and a sub exhaust port for discharging the exhaust gas, and a main flow path through which the exhaust gas flows from the introduction port to the main exhaust port. A sub-flow path that branches from the main flow path and guides the exhaust gas to the sub-discharge port,
A flow rate adjusting mechanism for adjusting the flow rate of the exhaust gas is provided in at least one of the main flow path from the branch point with the sub flow path from the branch point and the sub flow path. A featured dump truck. In claim 1,
The dump truck according to claim 1, wherein the flow rate adjusting mechanism includes a slide plate that is slidably provided at the sub discharge port and that can adjust an opening area of the sub discharge port according to a slide position. In claim 1,
The dump truck according to claim 1, wherein the flow rate adjusting mechanism includes an orifice plate that is provided at the sub discharge port and adjusts an opening area of the sub discharge port. A cargo bed used for a dump truck driven by an engine,
The loading platform includes an introduction port for introducing exhaust gas of the engine, a main discharge port and a sub discharge port for discharging the exhaust gas, a main flow path through which the exhaust gas flows from the introduction port to the main discharge port, A sub-channel that branches from the main channel and guides the exhaust gas to the sub-discharge port,
A flow rate adjustment mechanism for adjusting the flow rate of the exhaust gas is provided in at least one of the main flow path and a portion on the main discharge port side from a branch point with the sub flow path. A cargo bed characterized by that.