JP4034203B2 - Watering device for rolling compaction vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a compaction vehicle equipped with a watering tank and spraying water at a front compaction wheel and a rear compaction wheel of the vehicle.
[0002]
[Prior art]
When asphalt pavement on roads etc. with a rolling compaction vehicle, if the rolling surface is rolled while the rolling wheel is dry, the asphalt mixture will adhere to the surface of the rolling wheel. The deposits impair the flatness and smoothness of the paved surface. Therefore, in general, a rolling vehicle is equipped with a watering device that sprays water or a liquid agent with a nozzle toward the surface of the rolling wheel, and prevents water or asphalt from adhering continuously or intermittently during the rolling operation. The asphalt mixture is prevented from adhering by spraying a liquid agent such as an agent onto a rolling wheel (see, for example, Patent Document 1).
[0003]
4 (a) and 4 (b) are watering circuit diagrams showing two conventional examples relating to the watering device, both of which include a water tank 51 for the front roller wheel and a water tank 52 for the rear roller wheel. Indicates. FIG. 4A shows a structure in which a circuit for a front roller wheel and a circuit for a rear roller wheel are independent from each other, and a pipe line that connects a water tank 51 and a nozzle 53 for the front roller wheel, A vortex pump 55, a filter 56, and a check valve 57 are provided from the upstream side in the pipe lines that communicate the water tank 52 and the nozzle 54 for the rear rolling wheel. An air vent cock 58 is provided on the downstream side of the centrifugal pump 55. Note that the check valve 57 is a valve for preventing the residual pressure in the pipe line and the backflow of water due to the siphon phenomenon after the centrifugal pump 55 is stopped.
[0004]
In FIG. 4 (b), the pipes from the water tanks 51 and 52 are once joined at the joining part 59, and the spiral pump 55, the filter 56, and the check valve 57 are connected from the upstream side on the joined pipe. After being provided, a structure is shown in which the pipe is branched at the branching portion 60 and communicated with the nozzles 53 and 54. An air vent cock 58 is provided between the filter 56 and the check valve 57.
[0005]
[Patent Document 1]
JP 2000-257016 A (page 4, FIG. 1)
[0006]
[Problems to be solved by the invention]
The conventional watering device shown in FIGS. 4A and 4B has the following problems. First, in the watering device shown in FIG. 4 (b), when the pump function of the spiral pump 55 is damaged due to a failure or the like, watering stops on both the front roller wheel side and the rear roller wheel side. It becomes. The sprinkler shown in FIG. 4A has a pair of centrifugal pumps 55, but the circuit for the front rolling wheel and the circuit for the rear rolling wheel are independent of each other. When the centrifugal pump 55 fails, watering on either the front rolling wheel side or the rear rolling wheel side stops. Since the rolling work must be performed while sprinkling water on both rolling wheels, it is a problem even if one of the rolling wheels cannot be sprinkled. I had to interrupt. In the apparatus shown in FIG. 4A, a spare centrifugal pump 55 'is provided so as to be in parallel with each centrifugal pump 55, and when the centrifugal pump 55 fails, this spare centrifugal pump 55' is used. There is a method to cope with this, but in this case, a total of four centrifugal pumps are required, resulting in an expensive watering device.
[0007]
In addition, for example, when water spraying in a rolling operation is resumed after all the water in the pipeline has been discharged in order to prevent freezing of the water in the pipeline during cold weather, a conventional centrifugal pump 55 is used. Has no water self-sufficiency capability, it was necessary to introduce this water into the vortex pump 55 as priming water by external operation when water was added to the water tanks 51 and 52 anew. For this reason, conventionally, as described above, it is necessary to provide the cock 58 for venting air, and the watering circuit becomes complicated, and there is a problem that an operation for operating these cocks 58 is additionally required for the operator. Of course, since the rolling work is started after the priming work is completed, the working efficiency of the entire rolling work is also inferior.
[0008]
Further, according to the watering circuit shown in FIG. 4 (b), when the vehicle is located on an inclined land or the like and a height difference of more than a predetermined level occurs between the water tanks 51 and 52, the water tank on the high position side is moved to the low position. There is a possibility that the water may move to the water tank on the side and overflow from the water tank on the low position side. In order to prevent this, conventionally, an opening / closing valve 62 is provided on one of the pipes connected to the water tanks 51, 52 on the upstream side of the junction 59, and this opening / closing valve is provided when the vehicle is located on a flat ground. When the vehicle is located on a sloping ground or the like with the opening 62 open, in the case shown in the figure, the front rolling wheel is run on the mountain side, and the on-off valve 62 is closed to prevent water from moving to the lower water tank. It was. However, opening and closing the on-off valve 62 each time the vehicle is located on a flat ground and a sloping ground is burdensome for an operator (usually a driver of the vehicle) and may forget to perform the operation.
[0009]
The present invention was created to solve the above problems, is economical, and is a case where one of the pumps provided in a pair has a pump function impaired due to a failure or the like. However, an object of the present invention is to provide a watering device for a rolling vehicle that enables watering on the front rolling wheel side and the rear rolling wheel side.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a water spray device for a compaction vehicle equipped with a plurality of water tanks and spraying water through nozzles in a front compaction wheel and a rear compaction wheel of the vehicle. Piped in parallel from a water tank to a pair of pumps, the pipes on the discharge port side of each pump are once merged, and on the downstream side of the merged part, the pipe line communicating with the nozzle on the front rolling wheel side and the reverse side The structure is branched so as to communicate with a pipe line communicating with the nozzle on the pressure wheel side, and a check valve is provided between each pump and the junction .
[0012]
Moreover, the said pump was comprised from the diaphragm type pump.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a watering circuit diagram of a watering device 1 for a compaction vehicle according to the present invention, and FIGS. 2 and 3 are an explanatory plan view and a side explanatory view showing the watering device 1 attached to the compaction vehicle, respectively. The compaction vehicle is not particularly limited as long as it has a front compaction wheel 2 and a rear compaction wheel 3 before and after the vehicle body B as shown in FIG. The front rolling wheel 2 and the rear rolling wheel 3 are iron wheels, tires, and the like.
[0014]
In the present embodiment, as shown in FIG. 3, the watering device 1 includes a water tank 4 for the front rolling wheel 2 and a water tank 5 for the rear rolling wheel 3 that are mounted before and after the vehicle body B, and a pair of Filters 6 and 7, a pair of pumps P 1 and P 2, and a nozzle 8 for the front rolling wheel 2 and a nozzle 9 for the rear rolling wheel 3 are provided. In addition to simple water, the water tanks 4 and 5 may store asphalt adhesion inhibitors made of mineral oil, asphalt adhesion inhibitors made by mixing mineral oil and water using emulsifiers, etc. It is appropriately selected depending on conditions and the like.
[0015]
Pipes 10 and 11 extend in the vehicle width direction above the front rolling wheel 2 and the rear rolling wheel 3 along the upper surface of each rolling wheel, as shown in FIG. A plurality of the nozzles 8 and 9 are attached to the pipes 10 and 11, respectively. Each of the nozzles 8 and 9 has a fine jet port and sprays water in a mist toward each rolling wheel. The pair of filters 6 and 7 and the pair of pumps P1 and P2 are disposed near the rear of the center of the vehicle body B as shown in FIG.
[0016]
In the present invention, as shown in FIG. 1, pipes T1 and T2 are connected in parallel from water tanks 4 and 5 to a pair of pumps P1 and P2, and pipes T1a and T2a on the discharge port side of pumps P1 and P2 are connected. A structure that once joins and branches downstream of the joining portion 12 so as to communicate with a pipe line T4 communicating with the nozzle 8 on the front rolling wheel side and a pipe line T5 communicating with the nozzle 9 on the rear rolling wheel side The main feature is that.
[0017]
Filters 6 and 7 are provided in the pipe line T1 that connects the water tank 4 and the pump P1 and the pipe line T2 that communicates the water tank 5 and the pump P2, respectively. As shown in FIG. 2, the pipe line T <b> 1 is connected to the front side of the water tank 4 via the connection part 21, and the pipe line T <b> 2 is connected to the rear side of the water tank 5 via the connection part 22. In FIG. 1, a pipe line T1a connected to the discharge port of the pump P1 and a pipe line T2a connected to the discharge port of the pump P2 are merged at the merging portion 12, and the pipe line T3 after merging is a pipeline at the branching portion 13. Branches to T4 and pipeline T5. In the present embodiment, the check valve 16 is provided in the pipe line T3. The check valve 16 plays a role of preventing the residual pressure in the pipe line after the pumps P1 and P2 are stopped and the backflow of water due to the siphon phenomenon.
[0018]
The above watering device 1 uses the water stored in the water tanks 4 and 5 as watering by operating the pumps P1 and P2 together during rolling. And even if one pump P1 fails and the pump function is impaired in watering, for example, the water stored in the water tank 5 by the other pump P2 is supplied to the pipes T2, T2a, Since the water is supplied to the pipes T4 and T5 via T3 and the branching portion 13, the water spraying from the nozzles 8 and 9 to the front roller wheel and the rear roller wheel is continued as it is. Similarly, when the pump P2 fails, the water stored in the water tank 4 is supplied to the pipelines T4 and T5 by the pump P1, and the watering is continued. Thus, according to the present invention, even if the pump function of any one of the pair of pumps P1 and P2 is impaired, watering on the front roller wheel side and the rear roller wheel side is possible. Since it is not necessary to interrupt the rolling operation, the working efficiency of the rolling operation is improved.
[0019]
Further, by providing check valves (check valves 14 and 15) between the pumps P1 and P2 and the merging portion 12, that is, in the pipes T1a and T2a, respectively, for example, when the compaction vehicle is on an inclined ground. Even if it exists, the backflow of the water from the confluence | merging part 12 to the water tank 4 or the water tank 5 can be prevented reliably. Of course, even if either one of the pumps P1 or P2 breaks down, the backflow of water from the junction 12 to the water tank 4 or the water tank 5 can be reliably prevented.
[0020]
As the pumps P1 and P2, by using a pump having a so-called water self-sufficiency that can introduce water into the pump only by the function of the pump from a state where the water is not filled, Therefore, there is no need to provide a venting cock or valve for priming water, and a simple watering circuit is obtained. In this embodiment, since the check valve 16 is provided as described above, the pumps P1 and P2 are pumps that can pump water against the urging force of the check valve 16.
[0021]
This eliminates the need for priming work such as operation of a venting cock or valve, thereby reducing the labor burden for the operator and allowing the rolling work to be started quickly. As such a pump, a diaphragm pump is suitable. Since the diaphragm pump is less expensive than the spiral pump, the economical watering device 1 can be obtained. Diaphragm pumps have built-in check valves due to their structural features. If diaphragm pumps are used as the pumps P1 and P2, there is no need to provide the check valves 14 and 15 outside the pump, and the watering circuit Is simplified and the watering device 1 can be easily assembled.
[0022]
The preferred embodiments of the present invention have been described above. The present invention is not limited to the embodiment described above, and the design, shape, layout, number, etc. of each component can be changed as appropriate without departing from the spirit of the present invention.
[0023]
【The invention's effect】
According to the present invention, the following effects are produced.
(1) A pipe that is connected in parallel from a plurality of water tanks to a pair of pumps, temporarily joins the pipes on the discharge port side of each pump, and communicates with the nozzle on the front rolling wheel side downstream of the junction. If it is configured to branch so as to communicate with the passage and the conduit communicating with the nozzle on the rear rolling wheel side, even if the pump function of one of the pair of pumps is impaired, the front rolling wheel Water spraying on the side and rear rolling wheel side is possible, and it is not necessary to interrupt the rolling operation, so the work efficiency of the rolling work is improved.
(2) If a check valve is provided between each pump and the merging section, the rolling vehicle is on a slope or the pump function of one of the pair of pumps is impaired. Even so, the backflow of water from the junction to the water tank can be reliably prevented.
(3) By constructing the pump from a diaphragm type pump, there is no need to provide an air vent cock or valve for priming water, and a simple water spray circuit is obtained. In addition, since a priming operation such as operation of a venting cock or a valve is not required, the labor burden on the operator is reduced, and the rolling operation can be started quickly.
[Brief description of the drawings]
FIG. 1 is a watering circuit diagram of a watering device for a compaction vehicle according to the present invention.
FIG. 2 is an explanatory plan view showing a watering device attached to a rolling compaction vehicle.
FIG. 3 is an explanatory side view showing a watering device attached to a rolling compaction vehicle.
4A and 4B are watering circuit diagrams of a conventional watering device.
[Explanation of symbols]
P1, P2 Pump 1 Sprinkler 2 Front rolling wheel 3 Rear rolling wheel 4, 5 Water tank 8, 9 Nozzle 12 Merging section 13 Branching section

Claims (2)

A water sprinkling device for a rolling compaction vehicle equipped with a plurality of water tanks and sprinkling water through nozzles in a front rolling wheel and a rear rolling wheel of the vehicle,
Piping in parallel from the plurality of water tanks to a pair of pumps,
The pipes on the discharge port side of each pump are once merged, and on the downstream side of the merge part, the pipe line communicating with the nozzle on the front rolling wheel side and the pipe line communicating with the nozzle on the rear rolling wheel side It is configured to branch so as to pass through ,
A water spray device for a rolling compaction vehicle, wherein a check valve is provided between each of the pumps and the junction . The watering device for a compaction vehicle according to claim 1, wherein the pump is a diaphragm type pump.

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