JP6719787B2 - Exhaust lift equipment for dump trucks - Google Patents

Description

The present invention relates to a device for heating or keeping heat of a space of a loading platform in a dump truck by utilizing engine exhaust.

2. Description of the Related Art Conventionally, there is known a technique of utilizing heat of engine exhaust of a vehicle for snow melting. For example, Patent Document 1 discloses a snow melting method and a snow accumulation prevention method in which exhaust gas emitted from an engine of a vehicle is injected toward a road surface of a road or accumulated snow. Further, Patent Document 2 discloses a technique in which water wound up by a tire is warmed by heat of exhaust gas and the warmed water is dropped onto a road surface to melt snow.

JP, 9-235711, A JP, 10-54017, A

In cold regions, especially in winter, there is a problem that the snow accumulated on the cargo bed is frozen or the cargo is frozen while the vehicle having the cargo bed such as a truck is traveling.

However, the current situation is that no effective countermeasure has been proposed for the problem of freezing of the bed of a running vehicle.

In view of the present situation described above, it is an object of the present invention to provide a device capable of heating or retaining heat of a cargo bed by utilizing heat of engine exhaust, particularly in a dump truck among vehicles having a cargo bed.

In order to achieve the above object, the present invention provides the following configurations. The numbers in parentheses are reference numerals in the drawings showing the embodiments described later, but are provided for reference and are not intended to limit the present invention to the embodiments.

An aspect of the present invention is an exhaust lift device (1) provided in a dump truck (20) for heating or retaining heat of a cargo bed (22) by utilizing engine exhaust,
An exhaust flow path member (2, 3, 4, 5) forming a flow path capable of guiding the inflowing exhaust gas to a position directly below the floor plate (22a) when the cargo bed (22) is in a non-inclined state;
A receiving member (5A) having an annular groove (5A3), which is attached to an opening of the exhaust flow path member (2, 3, 4, 5) facing upward above the floor plate (22a).
An exhaust passage hole (6A) penetrating the floor plate (22a) for discharging exhaust gas guided to the openings of the exhaust flow path members (2, 3, 4, 5) to the space of the cargo bed (22); ,
A cylindrical body (6B) extending downward from the peripheral edge of the exhaust passage hole (6A),
The cylindrical body (6B) is placed in the annular groove (5A3) of the receiver (5A) when the platform (22) is in a non-tilted state.

By installing the exhaust lift device according to the present invention in a dump truck, engine exhaust is guided to a position directly below the floor plate of the luggage carrier, and passes through the floor plate to be discharged into the space of the luggage carrier. Thereby, the space of the luggage carrier can be heated or kept warm.

FIG. 1 is a schematic perspective view of a dump truck equipped with an exhaust lift device according to the present invention. FIG. 2 is a schematic perspective view of the flow path switching device shown in FIG. FIGS. 3A and 3B are partially cutaway perspective views showing the states of the two switching positions in the flow path switching device shown in FIG. 2, respectively. FIGS. 4A and 4B are schematic side views of the dump truck showing the flow of exhaust gas in the state of the two switching positions corresponding to FIGS. 3A and 3B. FIG. 5A is a partially enlarged vertical cross-sectional view schematically showing the first flow path end portion and the exhaust passage portion in the exhaust lift device. (B) is a schematic perspective view of the cylindrical body shown in (a), and (c) is a schematic perspective view of the receiver shown in (a). FIG. 6A is a schematic plan view of a dump truck platform showing another embodiment of the exhaust lift device of the present invention, and FIG. 6B is a schematic sectional view taken along line I-I of FIG. FIG. 7A is a schematic plan view of a dump truck platform showing another embodiment of the exhaust lift device of the present invention, and FIG. 7B is a schematic II-II sectional view of FIG. 7A. FIG. 8A is a schematic plan view of a dump truck platform showing another embodiment of the exhaust lift device of the present invention, and FIG. 8B is a schematic sectional view taken along line III-III of FIG. FIG. 9 is a schematic plan view of a dump truck showing still another embodiment of the exhaust lift device of the present invention. FIG. 10 is a schematic side view of a dump truck showing still another embodiment of the exhaust lift device 1 of the present invention.

Hereinafter, an embodiment of an exhaust lift device for a dump truck according to the present invention will be described in detail with reference to the drawings showing examples.
FIG. 1 is a schematic perspective view of a dump truck to which an embodiment of an exhaust lift device according to the present invention is attached. The dump truck 20 has a driver's cab 21 and a cargo bed 22. FIG. 1 shows a state in which the cargo bed 22 is inclined so that the entire exhaust lift device 1 can be seen. Below the platform 22, there are a pair of vehicle body frames 23, an exhaust combustion device 24, tires and the like. Exhaust gas from an engine (not shown) is sent to an exhaust combustion device 24 through an exhaust pipe, where pollutants in the exhaust gas are purified. When the exhaust lift device 1 is not provided, the exhaust gas is discharged from the outlet of the exhaust combustion device 24.

The exhaust lift device 1 is installed in an empty space below the loading platform 22. For example, it is arranged on one side surface of the pair of vehicle body frames 23 and is appropriately fixed using the vehicle body frame 23. The exhaust lift device 1 is preferably made of a high heat-resistant material because high-temperature exhaust flows, and is made of, for example, iron or stainless steel.

Exhaust gas emitted from the exhaust combustion device 24 flows into the exhaust lift device 1. The exhaust lift device 1 of the present invention is preferably arranged in a stage subsequent to the exhaust combustion device 24. As a result, the exhaust lift device 1 is prevented from affecting the temperature sensor and the pressure sensor built in the exhaust combustion device 24.

The exhaust lift device 1 guides the inflowing exhaust gas to a position directly below the floor plate 22a of the loading platform 22. In this case, "the position directly below the floor plate 22a" means the position directly below the floor plate 22a in the non-inclined state of the bed 22, that is, in the state of the horizontal bed 22 during traveling, not in the state where the bed 22 is tilted as shown in FIG. Is.

The exhaust lift device 1 includes a flow passage forming member that forms a flow passage that can guide exhaust gas from the outlet of the exhaust combustion device 24 to a position directly below the floor plate 22a of the loading platform 22 in the non-inclined state. The flow path forming member is composed of a plurality of pipe members. In the illustrated example, the flow passage forming member includes an inflow pipe 2 connected to an outlet of the exhaust combustion device 24, a flow passage switching device 3 including a substantially T-shaped pipe, and a position directly below the floor plate 22a from the flow passage switching device 3. The first flow path pipe 4 forming the flow path up to and the first flow path end portion 5 are included. The arrangement position, shape, length, etc. of these pipe members are appropriately set according to different conditions for each vehicle.

Exhaust gas that is guided to a position directly below the floor plate 22a and is discharged from the opening of the first flow path end portion 5 passes through an exhaust passage portion 6 having a through hole formed in the floor plate 22a and is discharged to the space of the cargo bed 22. To be done. As the discharged exhaust gas flows through the space of the cargo bed 22, the heat of the exhaust gas is given to this space.

The flow path switching device 3 including a substantially T-shaped tube has a function of switching the exhaust gas that has flowed in through the inflow tube 2 to be directed to either the first flow path tube 4 or the second flow path tube 7. I have it. The second flow path pipe 7 is relatively short as shown in the figure and is for discharging exhaust gas as it is to the external space. The tip of the second flow path pipe 7 faces rearward or obliquely rearward of the dump truck and is slightly downward.

FIG. 2 is a schematic perspective view of the flow path switching device 3 shown in FIG. 3A and 3B are partial cutaway perspective views showing the states of the two switching positions in the flow path switching device 3 shown in FIG. 2, respectively. FIGS. 4A and 4B are schematic side views of the dump truck showing the flow of exhaust gas in the state of the two switching positions corresponding to FIGS. 3A and 3B. In FIGS. 3 and 4, the flow of exhaust gas is shown by a dotted line with an arrow.

As shown in FIG. 2, the flow path switching device 3 is formed of a rectangular tube having a rectangular cross section and has a substantially T shape in a plan view. Each of the three flow paths is open in three directions. The inflow pipe portion 3A located on the T-shaped center line is connected so as to communicate with the inflow pipe 2, and exhaust gas flows in. A first branch pipe portion 3B and a second branch pipe portion 3C extend in opposite directions of 180° from one end of the inflow pipe portion 3A. The angle formed by the inflow pipe portion 3A and the branch pipe portions 3B and 3C is 90°. The first branch pipe section 3B is connected so as to communicate with the first flow path pipe 4 shown in FIG. The second branch pipe section 3C is connected so as to communicate with the second flow path pipe 7 shown in FIG.

As shown in FIG. 1, preferably, the inflow pipe 2, the first flow passage pipe 4 and the second flow passage pipe 7 are pipes having a circular cross section, and therefore, in connection with the flow passage switching device 3 which is a rectangular pipe. Has a portion whose cross section changes from a circular shape to a rectangular shape. It is preferable that the pipe members are connected to each other by welding.

As shown in FIGS. 3A and 3B, the flow channel switching device 3 has a switching valve 3D for switching the flow channel. The switching valve 3D includes a swivel shaft 3D2 vertically arranged at the center of the innermost pipe wall when viewed from the opening of the inflow pipe portion 3A, and a rectangular flat valve plate 3D1. One side edge of the valve plate 3D1 is attached to the swivel shaft 3D2, and the valve plate 3D1 is rotatable around the swivel shaft 3D2. This rotation operation can be performed manually. In the illustrated example, the upper end of the swivel shaft 3D2 is projected to the outside of the flow path switching device 3, and a cock 3D3 for manually performing a turning operation is attached to this upper end.

In the first switching position of FIG. 3A, the valve plate 3D1 completely closes the second branch pipe portion 3C and connects the inflow pipe portion 3A and the first branch pipe portion 3B. In the first switching position, the surface of the valve plate 3D1 is inclined with respect to the exhaust flow direction in each of the inflow pipe section 3A and the branch pipe section 3B. As a result, the exhaust gas can be redirected from the inflow pipe portion 3A to the first branch pipe portion 3B at an angle larger than 90°, and flows smoothly without causing turbulent flow.

More preferably, as shown in the figure, the pipe wall 3E, which is the side wall of the portion that transitions from the inflow pipe portion 3A to the branch pipe portion 3B, also corresponds to the exhaust flow direction in each of the inflow pipe portion 3A and the branch pipe portion 3B. It is inclined. This also allows the exhaust gas to change its direction gently.

As shown in FIG. 4A, at the first switching position, the exhaust gas flows from the flow path switching device 3 to the first flow path pipe 4, passes from the first flow path end portion 5 and passes through the exhaust passage portion 6. It is discharged into the space of the loading platform 22. The heat of the exhaust gas is applied to the space of the loading platform 22 and the loading platform 22 is heated to melt the snow and prevent the loading from freezing. Therefore, the first switching position shown in FIG. 3(a) is mainly selected in the period of the outside temperature when there is a possibility of freezing and in the winter. Alternatively, for example, when transporting an asphalt mixture prepared for roadbed paving to a construction site, exhaust gas can be used as a heat retaining means. When using the exhaust gas for keeping heat, the first switching position may be selected regardless of the season.

On the other hand, in the second switching position of FIG. 3B, the valve plate 3D1 completely closes the first branch pipe portion 3B and connects the inflow pipe portion 3A and the second branch pipe portion 3C. Even in this second switching position, the surface of the valve plate 3D1 is inclined with respect to the exhaust flow direction in each of the inflow pipe section 3A and the branch pipe section 3C. Similarly, a pipe wall 3E, which is a side wall of a portion transitioning from the inflow pipe portion 3A to the branch pipe portion 3C, is also inclined with respect to the exhaust flow direction in each of the inflow pipe portion 3A and the branch pipe portion 3C.

As shown in FIG. 4B, at the second switching position, the exhaust gas flows from the flow path switching device 3 to the second flow path pipe 7, and is discharged to the external space as it is. In this case, the heat of the exhaust gas is not used, which is the same as the case where the exhaust lift device 1 is not provided. Therefore, the second switching position shown in FIG. 3(b) is mainly selected at times other than the period of the outside air temperature and winter when there is no risk of freezing. Further, when it is not necessary to heat or keep the cargo bed warm, this second switching position is selected.

FIG. 5A is a partially enlarged vertical sectional view schematically showing an example of the first flow path end portion 5 and the exhaust passage portion 6 in the exhaust lift device 1 described above. 5B is a schematic perspective view of the cylindrical body 6B shown in FIG. 5A, and FIG. 5C is a schematic perspective view of the receiver 5A shown in FIG. 5A.

An end of the first flow path pipe 4 that guides the exhaust gas G opens upward at a position directly below the floor plate 22 a of the loading platform 22. A first flow path end portion 5 is provided at the opening of the first flow path pipe 4. The first flow path end 5 has a receiver 5A attached around the opening, and a support member 5B for supporting and fixing the receiver 5A and the end of the first flow path pipe 4. Although not shown, the support member 5B is appropriately fixed to the vehicle body frame or the like. The fixing of these members can be performed by welding or tightening bolts and nuts.

The receiver 5A includes an inner cylinder 5A1 and an outer cylinder 5A2, the lower ends of the inner cylinder 5A1 and the outer cylinder 5A2 are connected to each other, and an annular groove 5A3 is formed. The inner diameter of the lower end of the inner cylinder 5A1 is substantially equal to the inner diameter of the opening of the first flow path pipe 4. Suitably, the diameter of the inner cylinder 5A1 is tapered toward the upper side. The inner cylinder 5A1 extends higher than the outer cylinder 5A2 and functions as a chimney.

The exhaust passage portion 6 provided on the floor plate 22a of the loading platform 22 has an exhaust passage hole 6A penetrating the floor plate 22a and a cylindrical body 6B extending downward from the peripheral edge of the exhaust passage hole 6A. The inner diameter of the cylindrical portion 6B1 of the cylindrical body 6B is substantially equal to the diameter of the exhaust passage hole 6A. A flange 6B2 for fixing the cylindrical body 6B to the lower surface of the floor plate 22a is formed at the upper end of the tubular portion 6B1.

When the loading platform 22 is in the non-inclined state, that is, when the loading platform 22 is horizontal, the tubular portion 6B1 of the cylindrical body 6B is fitted and placed in the annular groove 5A3 of the receiving member 5A. Since the inner cylinder 5A1 of the receiving tool 5A is tapered, the cylindrical body 6B can be placed without any trouble. As a result, the exhaust gas is transferred from the first flow path pipe 4 to the space of the loading platform 22 without leaking laterally. Further, since the cylindrical body 6B is simply placed on the receiving tool 5A, it does not affect the tilting operation of the loading platform 22 at all.

6, 7 and 8 are a schematic plan view and a schematic sectional view of a dump truck platform showing another embodiment of the exhaust lift device 1 of the present invention. In these embodiments, the exhaust duct portion 8 is provided in the space of the cargo bed 22. The exhaust duct portion 8 communicates with the exhaust passage portion 6 that penetrates the floor plate 22a of the cargo bed 22. The exhaust duct portion 8 has a function of efficiently distributing the heat of exhaust gas to the space of the cargo bed 22. In each figure, the flow of exhaust gas is shown by a dotted line with an arrow.

In the embodiment in which the plan view is shown in FIG. 6A and the I-I sectional view of FIG. 6A is shown in FIG. Is provided. As shown in FIG. 6B, the front exhaust duct portion forms a passage having a triangular cross section surrounded by a floor plate 22a, a front plate 22b, and a front surrounding member 8A obliquely arranged with respect to the floor plate 22a. doing. Similarly, the left and right exhaust duct portions form a passage having a triangular cross section surrounded by a floor plate 22a, a side plate 22c, and a side surrounding member 8B obliquely arranged with respect to these. The front surrounding member 8A and the side surrounding members 8B are, for example, iron plates or steel plates, and are fixed by welding or the like (the same applies to the surrounding members below).

7(a) is a plan view and FIG. 7(b) is a sectional view taken along line II-II of FIG. 7(a). In addition to the three-way exhaust duct portions of FIG. Parts are provided. As shown in FIG. 7B, the added exhaust duct portion forms a passage having a triangular cross section surrounded by the floor plate 22a and the floor surrounding member 8C. As the floor surrounding member 8C, for example, an L-shaped angle steel material can be used.

In the embodiment in which the plan view is shown in FIG. 8A and the III-III cross-sectional view of FIG. 8A is shown in FIG. As shown in FIG. 8B, a spacer 8D1 having a plurality of predetermined lengths and thicknesses is arranged and fixed at an appropriate position on the floor plate 22a, and a full-face enclosing member 8D is placed thereon. , An exhaust duct portion including a plurality of passages that branch and join. The entire surface surrounding member 3D is, for example, an iron plate or a steel plate, and the spacer 8D1 is, for example, a square steel material.

FIG. 9 is a schematic plan view of a dump truck showing still another embodiment of the exhaust lift device 1 of the present invention. In this embodiment, the floor plate 22a of the loading platform 22 is provided with four exhaust passage portions 6. The four exhaust passage portions 6 are arranged in a well-balanced manner, two in the front part and two in the rear part of the loading platform 22. Further, the first flow path pipe 4 connected to the branch pipe portion 3B of the flow path switching device 3 also branches to a position directly below the floor plate 22a where the exhaust passage portions 6 are formed.

The number and arrangement of the plurality of exhaust passage portions 6 are not limited to the example shown in the figure, and can be appropriately set as necessary or according to conditions such as the size and structure of the dump truck.

FIG. 10 is a schematic side view of a dump truck showing still another embodiment of the exhaust lift device 1 of the present invention. A part of the components of the dump truck is cut out and shown. Further, the flow of exhaust gas is shown by a dotted line with an arrow.

In this embodiment, the dump truck 20 is a trailer type. The cab 21 is a towing head, and the cargo bed 22 is rotatably connected to the cab 21 in a horizontal plane. Therefore, the first flow path pipe that guides the exhaust gas from the flow path switching device 3 of the exhaust lift device 1 to a position directly below the loading platform 22 is configured so as to correspond to the swiveling operation of the loading platform 22 in the horizontal plane with respect to the cab 21. There is.

The first channel pipe is composed of a plurality of pipe members and an annular connecting member. First, the pipe member 4A similar to the first flow passage pipe 4 in the above-described embodiment is provided between the flow passage switching device 3 and the lower portion of the annular head-side connector 4B fixed to the frame of the cab 21. It is connected. Further, a flexible pipe member 4C is connected between the upper part of the head-side connecting tool 4B and the upper part of the annular loading platform-side connecting tool 4D. Further, the loading platform side connector 4D is attached to the frame of the loading platform 22 so as to be rotatable. Such a flexible metal pipe member and a rotatable joint are widely used as piping members. With the flexible pipe member 4C and the bed-side connector 4D that is a swivel joint, swivel movement of the bed 22 with respect to the cab 21 in the horizontal plane can be dealt with.

The pipe member 4E connected to the lower portion of the luggage carrier-side connector 4D is connected to the first flow path end portion 5 provided directly below the luggage carrier 22 as in the above-described embodiment. The cargo bed 22 is provided with the exhaust passage portion 6 as in the above-described embodiment.

As described above, also in the trailer-type dump truck 20, the exhaust gas of the engine can be guided to the loading platform 22. The arrangement position, shape, length, etc. of the first flow path pipe are not limited to this embodiment, but can be variously designed according to the structure of the dump truck to which the present invention is applied.

Although the embodiments of the present invention have been described with reference to the examples, various modifications can be made according to the principles of the present invention.

1: Exhaust lift device 2: Inflow pipe 3: Flow passage switching device 4, 4A to 4E: First flow passage pipe 5: First flow passage end portion 6: Exhaust passage portion 7: Second flow passage pipe 8: Exhaust duct Part 8A: Front surrounding member 8B: Side surrounding member 8C: Floor surrounding member 8D: Full surface surrounding member 20: Dump truck 21: Driver's cab 22: Cargo platform 22a: Floor board 23: Body frame 24: Exhaust combustion device

Claims (1)

An exhaust lift device (1) provided in a dump truck (20) for heating or retaining heat of a cargo bed (22) using engine exhaust,
An exhaust flow path member (2, 3, 4, 5) forming a flow path capable of guiding the inflowing exhaust gas to a position directly below the floor plate (22a) when the loading platform (22) is in a non-inclined state;
A receiving member (5A) having an annular groove (5A3), which is attached to an opening of the exhaust flow path member (2, 3, 4, 5) facing upward above the floor plate (22a).
An exhaust passage hole (6A) penetrating the floor plate (22a) for discharging exhaust gas guided to the openings of the exhaust flow path members (2, 3, 4, 5) to the space of the cargo bed (22); ,
A cylindrical body (6B) extending downward from the peripheral edge of the exhaust passage hole (6A),
An exhaust lift device for a dump truck, wherein the cylindrical body (6B) is placed in the annular groove (5A3) of the receiving member (5A) when the loading platform (22) is in a non-inclined state.

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