JPH0732570Y2 - Plate compactor - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention is designed to prevent the asphalt mixture from adhering to the bottom plate when the bottom plate of the bottom plate box is heated by the high heat generated in the engine cylinder block or the like to compact the asphalt mixture. The plate compactor.

[Conventional technology]

Generally, when compacting a pavement such as a road using a plate compactor, the asphalt mixture, which is a pavement material, often adheres to the bottom plate of the plate compactor.
In order to prevent this adhesion, water or oil was applied to the contact surface between the bottom plate and the asphalt mixture, but in the case of water, the temperature of the asphalt mixture will decrease and the asphalt will harden, so the compaction effect will deteriorate. When oil was applied, there were problems such as deterioration of the asphalt mixture. Therefore, at present, the exhaust gas of the engine of the plate compactor is introduced into the bottom plate box, and the bottom plate is provided with an exhaust port to heat the bottom plate to prevent adhesion of the asphalt mixture.

FIG. 3 is a side view showing an entire plate compactor provided with such a device, in which high-temperature exhaust gas generated by the operation of the engine 1 enters the muffler 2, the exhaust pipe 3, and the flexible pipe. After passing through 4, the bottom plate box 5 is formed in a boat shape, and is discharged from the exhaust port 6.

FIG. 4 is a diagram schematically showing the exhaust gas passage,
The engine exhaust gas shown by the arrow A is discharged from the exhaust port 6 through the passage shown in the figure as shown by the arrow B.

[Problems to be solved by the device]

However, the exhaust gas immediately after combustion is hot, and the temperature of the muffler 2 near the engine is around 400 ° C,
The metal enters the bottom plate box 5 through the exhaust pipe 3 and the flexible pipe 4 and diffuses. Therefore, the bottom plate box 5 serves as a second muffler having a larger internal volume than the muffler 2, and most of the heat of the exhaust gas diffused in the bottom plate box 5 is discharged from the exhaust holes 6 of the bottom plate box 5. The bottom plate 7 is not heated effectively because it is discharged to the outside.

Further, this plate compactor is adapted to generate a ground impact vibration by a vibrating device 8 mounted on the bottom plate box, in order to mitigate the direct transmission of this shock vibration to the portion where the engine 1 is mounted. A vibration proof rubber 9 is interposed between this portion and the bottom plate box 5. Therefore, the flexible pipe 4 having both ends attached to the exhaust pipe 3 and the bottom plate box 5
Since the exhaust gas is high in temperature, it is made of metal, and is subject to repeated bending and stretching stress due to elastic vibration of the vibration-proof rubber 9, so that fatigue damage easily occurs at an early stage.

The present invention has been made in view of the above problems, and solves the above problems by circulating a liquid refrigerant between a liquid passage such as a cylinder block of an engine and a bottom plate box. It is an object.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a liquid passage provided in at least one of a cylinder block wall and a cylinder head wall of an engine of a plate compactor, and a bottom plate box having a vibration plate as a bottom plate. This is a plate compactor in which at least a part is provided with a flexible heat-resistant tube and is connected through a heat exchange liquid circulation pump.

[Action]

In this invention, since the liquid refrigerant in the bottom plate box is heated to a high temperature in the liquid passage provided in at least one of the cylinder block wall and the cylinder head wall, the present invention is configured as described above. Since the bottom plate, which is the vibrating plate, is sufficiently heated by constantly circulating and exchanging heat with the pump through the heat-resistant pipe, the asphalt mixture does not adhere to the bottom plate during compaction.

In addition, by using a flexible heat-resistant tube made of a heat-resistant rubber hose or the like for at least a part of the communication path of the liquid refrigerant, vibration with a small amount of bending and stretching (amplitude) is absorbed in that part, so Fatigue damage in communicating passages is unlikely to occur.

〔Example〕

The invention will be described below with reference to the drawings. 1 and 2 show an embodiment according to the present invention. The same parts as those in the conventional example are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a side view of a plate compactor according to the present invention, in which 10 is an engine of the plate compactor, 11 is a cylinder block, 12 is a cylinder head, and 11a and 12a are provided in a cylinder block wall and a cylinder head wall. It is a liquid passage (see FIG. 2). In the example of FIG. 2, the liquid passage 11a of the cylinder block 11 and the liquid passage 12a of the cylinder head 12 are shown.
Are in communication with each other, the liquid circulates from the liquid passage 11a to the liquid passage 12a, and then flows out to a rubber hose 17 described later.

The bottom plate box 5 is filled with a liquid (refrigerant) serving as a heat medium, and as the liquid, oil or the like having a high vaporization temperature is suitable.
13 is a pump, which is a belt from the output shaft 14 of the engine 10.
By obtaining power through 15, a flexible heat-resistant pipe that is a communication passage on the inlet side, in this embodiment, oil sucked from a heat-resistant rubber hose 16 is sent to the liquid passages 11a, 12a of the engine, and the cylinder block The oil that has undergone heat exchange in 11th grade, etc. to prevent overheating of the engine and has reached a high temperature is sent into the bottom plate box 5 via the heat resistant rubber hose 17 which is a communication passage on the outlet side, and after heating the bottom plate 7, the heat resistant rubber hose 16 is used again. Repeat the action of sucking. Thus, the cooling of the cylinder block and the heating of the bottom plate are performed at the same time, and the temperature of the bottom plate 7 increases, so that the asphalt mixture does not adhere. Although the flexible heat-resistant rubber hoses 16 and 17 are used for the entire communication passage in the present plan, the flexible heat-resistant hoses are used only for the portion that receives the expansion and contraction vibration of the vibration-proof rubber 9 that alleviates the shock vibration of the machine body. May be.

Also, the cooling air volume of the fan (not shown) for air-cooling the engine of the plate compactor is small because heat is exchanged by the refrigerant in the cylinder block in the present invention, so a small cooling fan is sufficient. Or it becomes unnecessary.

In addition, in the embodiment, the liquid passage is shown as an example in which the liquid passage is formed in both the cylinder block 11 and the cylinder head 12, but the liquid passage is formed in only one of them, and the liquid passage is formed at both ends thereof. The hoses 16 and 17 may be connected.

[Effect of device]

As described above, according to the present invention, the bottom plate of the asphalt mixture is heated to the bottom plate of the asphalt mixture without supplying water or applying oil by heating the bottom plate with the heat energy of the engine which was conventionally wasted. The effect of preventing the adhesion of the asphalt and efficiently compacting the asphalt mixture can be obtained.

In addition, since the heat of the engine is exchanged with the liquid, the cooling fan can be downsized or omitted, so that the noise due to the fan is reduced or eliminated.

[Brief description of drawings]

FIG. 1 is a side view of a plate compactor according to the present invention,
FIG. 2 is a schematic view of a main part in FIG. 1, FIG. 3 is a side view of a conventional plate compactor, and FIG. 4 is a schematic view of an exhaust gas passage in a conventional example. 1,10 …… Engine, 5 …… Bottom plate box, 7 …… Bottom plate, 11 ……
Cylinder block, 12 ... Cylinder head, 11a, 12a ...
… Liquid passage, 13 …… Pump, 16,17 …… Flexible heat-resistant hose (communicating passage).

Claims (1)

[Scope of utility model registration request] 1. A liquid passage provided in at least one of a cylinder block wall and a cylinder head wall of an engine of a plate compactor, and a bottom plate box having a diaphragm as a bottom plate are flexible at least in part. A plate compactor characterized in that it is made to communicate through a heat exchange liquid circulation pump by a communication passage provided with a heat resistant tube.