JP2014211047A - Vibration plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration plate capable of preventing asphalt from adhering to a contact surface of the vibration plate, without deteriorating a paved surface of an asphalt pavement.SOLUTION: A vibration plate has a box-shaped structure comprising a contact surface part (11f). A high-temperature general-purpose heat medium (such as high-temperature general-purpose heat medium oil and hot oil) is encapsulated in the inside (10i) of the box-shaped structure. The high-temperature general-purpose heat medium is heated by exhaust gas from an on-board engine (20).

Description

  The present invention relates to a plate type vibration compactor equipped with a small engine, which is a machine for compacting a pavement surface on which an asphalt mixture is laid.

Plate-type vibration compactors (for example, trade names “Plate Compactor”, “Vibro Plate”, etc.) are road pave compacting machines equipped with small engines.
The plate-type vibration compactor drives the vibration generator by rotating the engine, and directly transmits the vibration energy generated by the vibration generator to the ground via the compaction plate. It is a compacting machine.
Compared with other compaction machines, the plate-type vibration compactor has a large compaction area with respect to mass, so it is effective for surface finishing operations. In general, it is used to compact roadbeds or asphalt pavements around structures.

A conventional plate-type vibration compactor will be described with reference to FIGS.
In FIG. 6, a general plate type vibration compactor is indicated by reference numeral 100J, FIG. 7 shows a vibration generating mechanism 30 in the plate type vibration compactor 100J, and FIG. 8 shows a vibration generating body in the vibration generating mechanism 30. 50 is shown schematically.

  In FIG. 6, a plate-type vibration compactor (hereinafter referred to as “vibrating plate”) denoted as a whole by reference numeral 100 J is a compaction plate (hereinafter referred to as “consolidation plate”) 10 J, an engine 20, and a vibration generating mechanism 30. And a guide handle 40.

6 to 8, the vibration generating mechanism 30 includes an engine 20, a vibration generating body 50, a driving pulley 22, a driven pulley 52, and a V belt 60.
The vibration generator 50 is, for example, a “flying wheel” and is stored in the casing 55. The casing 55 is fixed to the compaction plate 10J through casing legs 56.
The arrow R in FIG. 6 indicates the direction of rotation of the vibration generator 50 (flywheel).

The vibration generator 50 includes a rotating shaft 51, and a driven pulley 52 is fixed to the end of the rotating shaft 51.
A driving pulley 22 is fixed at the tip of the driving shaft 21 of the engine 20. The drive shaft 21 is provided with a clutch (for example, a centrifugal clutch) 23. In FIG. 7, a clutch (for example, a centrifugal clutch) 23 is interposed on the drive shaft 21, but in many cases, it is incorporated in the drive pulley 22 in an actual machine.

  When the engine 20 is driven, the rotational force of the engine 20 is transmitted to the vibration generator 50 that is a flywheel via the driving pulley 22, the V belt 60, and the driven pulley 52, and rotates the vibration generator 50. As the vibration generator 50 rotates, the casing 55 vibrates, the vibration is transmitted to the compaction plate 10J through the casing 55 and the legs 56, and the compaction plate 10J vibrates in the vertical direction.

When the vibration plate (plate-type vibration compactor) 100J is used for compacting asphalt pavement, in order to prevent the asphalt contained in the high-temperature (100-150 ° C.) asphalt mixture material asphalt pavement material, Light oil, kerosene, or the like having an adhesion preventing effect may be applied to the contact surface 11J with the pavement surface.
However, since light oil and kerosene have the property of dissolving asphalt, if a lot of light oil and kerosene are used, the quality of the asphalt pavement surface may be deteriorated. Moreover, the existing structure around the pavement work may be soiled by light oil and kerosene.
Water-soluble (water emulsion) anti-adhesion material may be used to prevent asphalt adhesion, but the anti-adhesion material lowers the temperature of the asphalt pavement surface. There is a problem that it goes against the request for compaction work.

Here, in order to prevent asphalt from adhering to the compaction plate 10J, it is effective to raise the temperature of the contact surface where the compaction plate 10J contacts the asphalt.
It has been confirmed that asphalt pavement compaction work can prevent adhesion of asphalt to the compaction plate 10J by raising the temperature of the contact surface to approximately 100 ° C. or higher.

In conventional work sites, the contact surface 11J with which the compaction plate 10J contacts the asphalt is heated by, for example, a gas burner to prevent asphalt adhesion.
However, heating with a gas burner or the like must be repeated frequently, and the asphalt pavement compaction operation must be interrupted each time.
Further, since the contact surface is heated depending on the “intuition” of the operator, the contact surface 11J may be overheated. If the contact surface 11J comes into contact with the asphalt surface in an overheated state, the asphalt may be burned, and the quality of the asphalt pavement may be impaired.

In addition, asphalt compaction plate compactors have been proposed (see, for example, Patent Document 1).
However, the related art (Patent Document 1) does not solve the above-described problem.

JP 2001-20213 A

  The present invention has been proposed in view of the above-described problems of the prior art, and provides a vibration plate that can prevent asphalt from adhering to the contact surface of the vibration plate without degrading the pavement surface of the asphalt pavement. It is an object.

  The compaction plate (10) in the plate-type vibration compactor (100) of the present invention has a box-type structure having a contact surface portion (11f), and a high-temperature general-purpose heat medium (10i) is provided inside the box-type structure (10i). For example, high-temperature general-purpose heat medium oil (hot oil) is enclosed, and the high-temperature general-purpose heat medium is heated from the exhaust gas of the mounted engine (20).

  In the present invention, a pipe (conduit 14) that passes through the inside (10i) of the box-type structure is provided, and the pipe (14) serves as an engine exhaust gas pipe (exhaust duct) through which the exhaust gas of the engine (20) flows. Preferably they are connected.

  Here, the pipe (conduit pipe 14) can be connected to and removed from the engine exhaust gas pipe (exhaust duct), and the pipe (conduit pipe 14) can be connected to and removed from an external heating device (for example, the burner 7). It is preferable that it is free.

According to the present invention having the above-described configuration, asphalt adheres to the contact surface of the compaction plate (10) (the contact surface 11f where the compaction plate 10 contacts the asphalt) without degrading the paved surface of the asphalt pavement. In order to prevent this, the contact surface (11f) of the box-type structure can be heated using a high-temperature general-purpose heat medium (or ultra-high-temperature heat medium) (so-called “hot oil”) as a medium. And if a contact surface (11f) is heated to 100 degreeC or more, it will prevent that asphalt adheres to the said contact surface (11f).
Here, asphalt adhesion is prevented by heating the contact surface, and it is not necessary to use light oil or kerosene. Since light oil and kerosene are not used, the asphalt is not melted and there is no risk of degrading the quality of the asphalt pavement surface. Moreover, the existing structure around the pavement work is not soiled by light oil or kerosene.
Similarly, according to the present invention, it is not necessary to use a water-soluble adhesion preventing material. Therefore, the temperature of the asphalt pavement surface is not lowered by the water-soluble adhesion preventing material, and the compacting operation can be performed while the asphalt temperature is high.

Moreover, according to this invention, since the contact surface (11f) is heated via the high temperature general purpose heat medium, there is no possibility that the said contact surface (11f) will be heated too much.
If overheating of the contact surface (11f) can be prevented, a situation in which the overheated contact surface (11f) contacts the asphalt and burns the asphalt is prevented, and the quality of the asphalt pavement is not impaired.

Further, according to the present invention, the box-type structure has the contact surface (11f), the high-temperature general-purpose heat medium is enclosed in the box-type structure (10i), and the high-temperature general-purpose heat medium is heated. If the serpentine tube (14) is provided in the box-type structure, the serpentine tube (14) is connected to the exhaust gas duct (25) of the engine (20) to the serpentine tube (14) (with the drive source of the vibration plate 100). The exhaust gas (150 to 200 ° C.) of the engine flows through, and the high-temperature general-purpose heat medium enclosed in the box structure (10i) can be heated.
That is, the contact surface (11f) where the compaction plate (10) contacts the asphalt can be heated by the exhaust gas of the engine mounted on the vibration plate (100), so that the contact surface (11f) is separately heated. There is no need to provide a heating device.

In addition, in the present invention, the pipe (conduit 14) is configured to be freely connected to and detached from the engine exhaust gas (exhaust duct), and the pipe (conduit 14) is connected to an external heating device (for example, a burner). If it is configured so that it can be connected to and disconnected from 7), the high-temperature general-purpose heat medium can be heated by the external heating device (7).
Therefore, an external heating device (for example, burner 7) is used instead of the engine exhaust gas when the engine displacement is low or the exhaust temperature is low, such as immediately after starting or immediately after idling. It is also possible to heat the serpentine tube and the high-temperature general-purpose heat medium. As a result, the time required for heating the contact surface (11f) is shortened, and work efficiency can be improved.

It is a side view of a 1st embodiment of the present invention. It is a partial side view which shows the box-type structure and the snake tube which have the asphalt contact surface of 1st Embodiment. FIG. 3 is a partial plan view showing the box structure and the serpentine tube of FIG. 2. FIG. 3 is a view taken along arrow A4 of FIG. 2. It is the elements on larger scale which show the principal part of 2nd Embodiment of this invention. The side view of the conventional vibration plate is shown. It is a block diagram which shows the power transmission system of the vibration plate of FIG. It is a Y arrow line view of FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
First, a first embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, a plate-type vibration compactor (hereinafter referred to as “vibration plate”) 100 includes a compaction plate 10, an engine 20, a vibration generation mechanism 30, and a guide handle 40. And the exhaust duct 25 which connects the exhaust system of the engine 20 main body and the member (after-mentioned) by the side of the compaction board 10 is provided.

The vibration plate 100 of the first embodiment of FIGS. 1 to 4 is different from the vibration plate 100J of the prior art described in FIGS. 6 to 8 in terms of the engine body 20, the vibration generating mechanism 30, the guide handle 40, and the like. It is the same.
Further, the vibration plate 100 according to the first embodiment does not include a mechanism (for example, a driving mechanism for rotating the caterpillar) for self-running as in the related art of FIGS.
Hereinafter, the first embodiment will be described mainly focusing on differences from the vibration plate 100J according to the related art.

  In the first embodiment of FIGS. 1 to 4, a clutch (for example, a well-known dog clutch: not shown) is provided in an output (rotation) transmission path of the engine 20 (for example, between the engine output shaft and the driving pulley). Is provided. The “disengagement / contact” operation of the clutch is configured to be performed, for example, by operating an operation lever (not shown) provided on the guide handle.

In the vibration plate 100 according to the first embodiment shown in FIGS. 1 to 4, the rotational force is transmitted to the vibration generating body (flywheel) 50 of the vibration generating mechanism 30 when the rotational speed of the engine 20 is increased, as in the prior art. The vibration generator (flywheel) 50 rotates to vibrate the compaction plate 10.
6 to 8, the centrifugal clutch 23 is provided on the output shaft 21 of the engine 20 (in the actual machine, a driving pulley). The centrifugal clutch 23 has an engine rotational speed and the compaction plate 10J is paved. It has a function of being connected (the centrifugal clutch 23) when it reaches a rotation speed (predetermined rotation speed) that generates vibration suitable for surface compaction.
Since the position of the vibration generating body 50 of the vibration generating mechanism 30 is deviated with respect to the position of the center of gravity (not shown) of the entire vibration plate 100, when the vibration generating body 50 rotates and the compaction plate 10J vibrates, it is conventional. The entire vibration plate 100J according to the technology moves in the direction {circle around (3)} (forward direction) while being dragged by the vibration of the compaction plate 10J. Here, it is difficult for the operator to grasp the timing at which the centrifugal clutch 23 is connected, and the compaction plate 10 starts to vibrate at a timing unintended by the operator, so that the vibration plate 100J becomes “ It is assumed that you will run "unintentionally".

On the other hand, in the vibration plate 100 of the first embodiment shown in FIGS. 1 to 4, a centrifugal clutch (automatic centrifugal clutch) is not used but a normal clutch (not shown) is used. It is configured to perform the operation of “disconnect, contact”.
Therefore, according to the vibration plate 100 of the first embodiment, the vibration generator 50 does not rotate and the compaction plate 10 is not rotated unless the operator connects a clutch (not shown) even when the engine speed increases. It does not vibrate and the vibration plate 100 does not move.
Then, when the compaction work is ready, for example, when the operator operates the operation lever provided on the guide handle 40 to connect the clutch, the vibration generator 50 rotates, The compaction plate 10 vibrates. By operating the guide handle 40, the travel position of the vibration plate 100 can be controlled to perform the compacting operation.

Next, the compaction plate 10 of the vibration plate 100 according to the first embodiment will be described mainly with reference to FIGS.
2-4, the compaction board 10 is comprised by the bottom part 11, the side wall part 12, and the canopy part 13, and is comprised by the box shape of a cross-section four-stroke shape (b-shaped).
As shown in FIG. 2, the bottom plate 11 warps upward and obliquely away from both ends (left and right ends in FIG. 2) and a contact surface 11 f (lower end surface in FIGS. 2 and 3) with the road surface.
2 and 3, the right side in the figure is defined as the rear side of the vibration plate 100, and the left side in the figure is defined as the front side of the vibration plate 100.

A metal pipe (for example, steel pipe) pipe (so-called “snake pipe”: hereinafter referred to as “heat exchange pipe”) 14 is disposed in the inside 10 i of the compaction plate 10 having a box structure.
An inlet 14a of the heat exchange pipe 14 is disposed in the vicinity of the rear end (the right end in FIG. 2) of the compaction plate 10. This inlet 14a is provided as an inlet for the heating fluid of the heat exchange pipe 14, and is arranged on the right side (right side when viewed from the front) in FIG. Yes.
As shown in FIG. 2, the heat exchange pipe 14 is bent in a horizontal direction at a right angle directly below the inlet 14a (first bent portion 14b), and the first bent portion 14b is a first straight portion 14c (see FIG. 3). ).

The first straight portion 14c crosses the vibration plate 10 in the width direction (vertical direction in FIG. 3) and is folded in the vicinity of the side wall on the side opposite to the inlet 14a (upper side in FIG. 3; left side in FIG. 4) ( The second bent portion 14d) communicates with the second straight portion 14e.
The second straight portion 14e extends to the same side as the inlet 14a (lower side in FIG. 3; right side portion in FIG. 4), and above the compaction plate interior 10i (upper side in FIG. 2) on the same side as the inlet 14a. ) At a right angle (third bent portion 14f).
In FIG. 2, the third bent portion 14f extends upward, penetrates the canopy portion 13, and curves forward (left side in FIG. 2) (fourth bent portion 14g). The fourth bent portion 14g is curved (bent at 120 °) so that the opening (the heated fluid discharge portion 14h) faces diagonally forward (lower left in FIG. 2).

The internal space 10i of the compaction plate 10 is filled with a high-temperature general-purpose heat medium (hot oil: for example, the trade name “Parrel Therm 300” or the trade name “Parrel Therm 330”).
Although not clearly shown, it is possible to make the cross-sectional shape of the region immersed in the hot oil of the heat exchange pipe 14 wavy, or to provide a plurality of fins and irregularities on the outer peripheral surface of the heat exchange pipe 14 It is possible. This is to improve the efficiency of heat exchange between the fluid flowing through the heat exchange pipe 14 (for example, exhaust gas of the engine 20) and the hot oil in the space 10i.

In the first embodiment, the exhaust outlet (not shown) of the engine 20 and the inlet 14 a of the heat exchange pipe 14 are connected by the exhaust duct 25.
The connection between the exhaust outlet of the engine 20 and the exhaust duct 25 and the connection between the exhaust duct 25 and the inlet 14a of the heat exchange pipe 14 are easy to attach and detach by a known technique (for example, a hose band or the like).
However, the connection at the connection portion can be performed in a manner that is not easy to attach and detach.

In the first embodiment, when the engine 20 is started, the exhaust gas of the engine is input to the inlet 14 a of the heat exchange pipe 14 through the exhaust duct 25.
The exhaust gas introduced into the inlet 14a of the heat exchange pipe 14 exchanges heat with the hot oil while flowing in a region immersed in the hot oil in the heat exchange pipe 14. Thereby, the temperature of the contact surface 11f with the pavement surface of the compaction plate 10 is also raised to a temperature at which asphalt does not adhere (100 ° C.) or more.
The exhaust gas cooled by the heat exchange with the hot oil is discharged from the exhaust port 14h of the heat exchange pipe 14 to the atmosphere.

According to various experiments by the inventor, it has been confirmed that the temperature of the contact surface 11f with the pavement surface of the compaction plate 10 is maintained at 100 ° C. or more for 60 minutes after 10 minutes from the start of the engine. Has been.
Since the heat exchange pipe 14 is bent a plurality of times as described above, the surface area of the region immersed in the hot oil in the internal space 10i of the compaction plate 10 can be sufficiently ensured. It is estimated that the amount of heat held by the 20 exhaust gases is reliably put into the hot oil.

According to 1st Embodiment of the structure mentioned above, since the temperature of the contact surface 11f with the pavement surface of the compaction board 10 heats up to predetermined temperature (temperature at which asphalt does not adhere: 100 degreeC or more), the said contact surface Asphalt can be prevented from adhering to 11f.
Since the temperature rise of the contact surface 11f is achieved by the amount of heat held by the exhaust gas, it is not necessary to provide a separate heating mechanism for heating the contact surface 11f.
Here, since the high-temperature general-purpose heat medium (hot oil) is sealed in the inside 10i of the compaction plate 10 having the box-type structure, the possibility that the heated hot oil leaks from the box-type structure is low.

Moreover, in 1st Embodiment, light oil and kerosene are not used and the asphalt just paved is not melted. Therefore, there is no risk of degrading the quality of the asphalt pavement surface. Moreover, the existing structure around the pavement work is not soiled by light oil or kerosene.
Similarly, according to the illustrated first embodiment, the water-soluble adhesion preventing material is not used. Therefore, the temperature of the asphalt pavement surface is not lowered by the water-soluble adhesion preventing material, and the asphalt temperature is high. Can be compacted.

Further, according to the first embodiment, the contact surface 11f with which the vibration plate 100 contacts the asphalt is indirectly heated by the exhaust gas of the engine 20 via hot oil.
Therefore, the temperature of the hot oil does not rise above a certain value, and there is no fear that the contact surface 11f will be heated too much, and a situation where the asphalt is burned can be prevented. And the quality of asphalt pavement is not impaired.

  Although not shown, in order to comply with various safety regulations, it is preferable that a fire extinguisher is attached to the guide handle 40 (FIG. 1), for example.

Next, a second embodiment will be described with reference to FIG. The whole vibration plate according to the second embodiment is denoted by reference numeral 100A.
In the second embodiment, in order to shorten the heating time of the compaction plate 10 when the engine exhaust temperature is low, such as immediately after start-up or immediately after idling operation, a burner is used instead of the engine exhaust gas. 7, the heat exchange pipe 14 and the high-temperature general-purpose heat medium (hot oil) can be heated.

In the vibration plate 100A shown in FIG. 5, the inlet 14a of the heat exchange pipe 14 is attachable to and detachable from an exhaust duct 25 via a well-known connection tool (for example, a hose band) (not shown). 8 can be attached and detached.
And the connection assistance tool 8 is comprised so that the injection part 71 of the burner 7 can be attached and removed. In addition, the well-known and commercially available member can also be used for the connection auxiliary tool 8 to which the injection part 71 of the burner 7 is attached and removable.

In FIG. 5, when the exhaust temperature of the engine is low, such as immediately after start-up or immediately after idling operation, the exhaust duct 25 is first removed from the inlet 14 a of the heat exchange pipe 14.
Then, the connection auxiliary tool 8 is attached to the inlet 14 a of the heat exchange pipe 14, and the injection unit 71 of the burner 7 is connected to the connection auxiliary tool 8.
If a flame or a hot gas is injected from the burner 7 in this state, the hot oil is caused to flow through the heat exchange pipe 14 and the hot oil filled in the inside 10i of the compaction plate 10 is rapidly heated. The temperature of the contact surface 11f where the vibration plate 100A contacts the asphalt can be raised.
Although not shown, it is possible to connect the injection section 71 of the burner 7 directly to the inlet 14 a of the heat exchange pipe 14 without using the connection aid 8.

According to the second embodiment shown in the figure, when the exhaust temperature of the engine 20 is low, it can be heated by the burner 7, so the time required for heating the contact surface 11f is shortened, and the work efficiency can be improved.
Note that the case where the exhaust temperature of the engine 20 is low corresponds to a case where idling takes a long time except at the time of starting. When idling takes a long time, for example, the compaction using the vibration plate 100A is completed in one area, but the preliminary work (working asphalt, etc.) is completed in the next compaction area. If the engine 20 is idling without being stopped and is on standby, it may take an unexpectedly long time. Even in this case, the temperature of the contact surface 11f of the compaction plate 10 is lowered.

In the second embodiment, unlike the first embodiment, a centrifugal clutch may be used.
According to the second embodiment, since the temperature of the contact surface 11f is performed by the burner 7, the temperature of the contact surface 11f can be raised before the engine 20 is started. Therefore, in the second embodiment, there is no need to increase the engine speed in order to raise the temperature of the contact surface 11f, and an unexpected timing for the operator because the engine speed has been raised in order to raise the temperature of the contact surface 11f. Thus, the vibration plate 100A does not move.
Therefore, inconvenience (described above in connection with the first embodiment) due to the use of the centrifugal clutch does not occur.

In the second embodiment in which the exhaust of the engine 20 and the gas burner (external heating device) 7 are used in combination, as described above, when the exhaust temperature of the engine 20 is low, such as at the start or immediately after idling operation continues for a long time. In this case, the inlet 14a of the heat exchange pipe 14 and the injection section 71 of the burner 7 are connected, and the hot oil is heated by the burner 7.
When the contact surface 11f is heated to a predetermined temperature (temperature at which asphalt does not adhere) by being heated by the burner, the injection section 71 of the burner 7 is removed from the inlet 14a of the heat exchange pipe 14, and the connection aid 8 is also connected to the inlet 14a. And the exhaust duct 25 of the engine 20 is connected to the inlet 14 a of the heat exchange pipe 14.
Thereafter, the engine 20 is driven to perform the compacting operation while keeping the contact surface 11f warm by the heat amount of the exhaust gas of the engine 20.

Here, the engine 20 is started after the exhaust duct 25 is connected to the inlet 14 a of the heat exchange pipe 14.
This is because if the engine 20 is started before the exhaust duct 25 is connected to the inlet 14a of the heat exchange pipe 14, the entire vibration plate 100A vibrates and high-temperature exhaust gas leaks from the exhaust duct 25.
Other configurations and operational effects in the second embodiment are the same as those in the first embodiment.

  It should be noted that the illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Compaction board 11 ... Bottom 11f ... Contact surface 14 ... Heat exchange pipe 20 ... Engine 30 ... Vibration generating mechanism 40 ... Handle 50 ... Vibration generating body / Handwheel 100 ... plate type vibration compactor / vibration plate

Claims (3)

  It has a box-type structure with a contact surface part, and a high-temperature general-purpose heat medium is sealed inside the box-type structure, and the high-temperature general-purpose heat medium is heated from the exhaust gas of the mounted engine. Vibration type plate compactor.   2. The vibration type plate compactor according to claim 1, wherein a pipe passing through the inside of the box structure is provided, and the pipe is connected to an engine exhaust gas pipe through which engine exhaust gas flows.   The vibration type plate compactor according to claim 1 and / or 2, wherein the pipe is freely connectable and detachable to / from an engine exhaust gas pipe, and the pipe is freely connectable and detachable to / from an external heating device.

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