JP3875454B2 - Dust collector for ground improvement equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dust collector of a ground improvement device used when a ground is improved by stirring and mixing a solidified material such as cement and lime and soil while excavating the ground as a foundation work such as a structure. More specifically, in order to collect the dust generated during the excavation and agitation processing of the improved ground using a trencher attached to the tip of the arm using a construction machine such as a backhoe as a base machine (base machine). The present invention relates to a dust collector.
[0002]
[Prior art]
As this kind of ground improvement technology, as shown in FIG. 5, a chain drive type trencher 3 for excavation and agitation of soil is provided at the tip of an arm 2 using a backhoe 1 as a base machine as a base machine. It is known that a ground improvement process is carried out by spraying a solidifying material from a nozzle (not shown) while feeding the trencher 3 into the ground (see, for example, JP-A-11-152740).
[0003]
Since dust generation is unavoidable during the ground improvement process, a flexible dustproof cover 4 such as a bellows is attached to the trencher 3 as shown in FIG. On the other hand, the dust cover 4 is connected to, for example, a dust collector 5 mounted on the backhoe 1 via a duct 16 so as to actively collect dust generated by the ground improvement process by the dust collector 5. .
[0004]
[Problems to be solved by the invention]
However, since the dust is a mixture of water-containing fine-grained earth and sand and a solidifying material for ground improvement, the filter in the dust collector 5 is clogged, and it is necessary to simply clean the filter frequently. Not only that, the lifetime of the filter itself is very short. In addition, the ground improvement work must be stopped at the time of cleaning the filter, and there is a disadvantage that time loss is large.
[0005]
The present invention has been made paying attention to the above-described problems. In particular, the present invention intends to provide a dust collector for a ground improvement device that facilitates maintenance of filter functions and maintenance work.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is attached to a ground improvement device in which a trencher for excavation and agitation is attached to the tip of an arm using a predetermined construction machine as a mother machine, and along with excavation and agitation processing by the trencher. A device for collecting the generated dust, wherein the trencher is provided with a dustproof cover surrounding the improved ground region while being in contact with the surface of the improved ground , and a primary filter is provided in the dustproof cover, The dust cover is connected to a dust collection unit having a suction means and a secondary filter via a duct, and the dust collection unit includes a plurality of filters constituting a secondary filter upstream of the suction means. characterized in that the element has been arranged in series, each filter element is detachable independently of the unit body It is.
[0007]
The dust collection unit is more preferable in terms of transportability when mounted on a construction machine that serves as a mother machine, but may be of a type that is simply placed on the ground, for example. As the primary filter, it is desirable to use a filter such as a bag filter.
[0008]
Therefore, in the first aspect of the present invention, the dust generated with the ground improvement process is subjected to the primary collection process by the primary filter in the dust cover, and the dust after the primary collection process passes through the duct. Then, it is sent to the dust collection unit, and secondary collection processing is performed in the dust collection unit.
[0009]
In this case, if the dust collected by the primary filter in the dust-proof cover is dropped by, for example, positively vibrating the dust-proof cover itself, the dust itself remains as part of the solidification material for ground improvement. At the same time, the primary filter is cleaned to prevent clogging at the same time, so there is almost no need for cleaning by the operator. Life expectancy can be realized.
[0010]
In addition, since the filter in the dust collection unit functions as a secondary filter that collects dust after the primary collection process, the load on the filter in the dust collection unit is relatively reduced, Thus, it is not necessary to stop the operation each time and perform frequent cleaning, and the life of the filter in the dust collecting unit is also prolonged.
In particular, as long as the primary filter in the dust cover is functioning effectively, even if the filter elements forming the filter in the dust collection unit are taken out one by one even during the dust collection operation, the dust collection function will be improved. No problem. Therefore, even during the dust collection operation, the filter elements in the dust collection unit can be taken out one by one and cleaned as necessary.
[0011]
In the second aspect of the present invention, there is a diffusion means for diffusing dust introduced from the duct over the entire surface of the dust collecting area of the secondary filter on the inlet side of the dust collecting unit in the first aspect of the present invention . It is characterized by being provided .
[0012]
Further, in the invention described in claim 3, the inlet side of the dust collecting unit in the invention described in claim 2 has a divergent shape so that the opening area gradually increases toward the dust collection area of the secondary filter. It is characterized by being formed.
[0013]
Therefore, in the inventions according to the second and third aspects, the entire collection area of the secondary filter can be effectively used to dramatically increase the collection efficiency.
[0014]
According to a fourth aspect of the present invention, on the premise of the first aspect of the present invention, the dustproof cover is provided with a first suction means together with a primary filter, and the dust collecting unit The suction means is characterized by functioning as a second suction means.
[0015]
Therefore, the invention described in claim 4 is provided with an independent suction means on the dust-proof cover side, on the premise that the primary collection process by the primary filter and the secondary collection process by the secondary filter are performed. Therefore, the dust suction efficiency and the trapping efficiency are dramatically improved, and this is particularly preferable in purifying exhaust gas discharged from the dust collection unit.
[0018]
【The invention's effect】
According to the first aspect of the present invention, since the primary dust collection process is performed by the primary filter provided in the dustproof cover, the dust collected by the primary filter is shaken off by vibration or the like, and the dust is collected on the spot. Can improve the so-called yield of solidification material for ground improvement and relatively reduce the dust collection burden on the dust collection unit side, reducing the maintenance man-hours of the dust collection unit And extending the life of the filter means.
[0019]
In addition, a plurality of filter elements are arranged in series as secondary filters upstream of the suction means in the dust collection unit, and each filter element is detachable, so even the primary filter functions effectively. If so, it is possible to clean the secondary filter on the dust collecting unit side even during the dust collecting operation, and there is an effect that the loss time for cleaning the filter can be shortened.
[0020]
According to the second aspect of the present invention, the inlet side of the dust collecting unit is provided with a diffusing means for diffusing dust introduced from the duct over the entire dust collecting area of the secondary filter, and According to the invention described in claim 3, the inlet side of the dust collecting unit is formed in a divergent shape so that its opening area gradually increases toward the dust collection area of the secondary filter. Therefore, in any case, the dust collection efficiency by the dust collection unit is further improved, and there is an advantage that it can contribute greatly to the purification of exhaust gas from the dust collection unit.
[0021]
According to the fourth aspect of the invention, since the first suction means is provided together with the primary filter on the dust-proof cover side, the dust collection efficiency is further improved.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 are diagrams showing typical embodiments of the present invention. In particular, FIG. 1 shows a schematic configuration of the entire dust collector in the ground improvement device, and FIGS. 2 to 4 show details of each part of FIG. Respectively. In FIG. 1, parts that are the same as those in FIG.
[0023]
As shown in FIG. 1, the trencher 3 is provided with a flexible dustproof cover 6 having a substantially rectangular bellows shape as in the prior art, while a dust collecting unit is mounted on the vehicle body 1a of the backhoe 1 serving as a mother machine. 7 is mounted, and the dust cover 6 and the dust collecting unit 7 are connected to each other through a predetermined flexible duct 8.
[0024]
As shown in FIGS. 2 and 3, a bag-filter-like primary filter 9 having a shape like a so-called cloth bag is accommodated in the dust-proof cover 6, and a duct is formed on the upper surface side via a suction hopper 10. A suction device 11 is provided as a first suction means so as to be interposed between the suction device 8 and the second suction device. The suction device 11 may be any device that can generate a suction force through the primary filter 9 in the dust cover 6. For example, the suction device 11 may be a general fan type or an axial flow type, or by introducing positive pressure. It may be of a type that generates a suction force.
[0025]
Further, as shown in FIG. 4, the dust collecting unit 7 is formed in a hopper shape or a skirt shape so as to gradually reduce the diameters of the both ends of the casing 12 as the side unit body, that is, the inlet portion 12a and the outlet portion 12b. The inlet portion 12a is connected to the duct 8, and the outlet portion 12b is connected to the suction device 13 which is the same as the suction device 11 on the dustproof cover 6 side as the second suction means. In the casing 12, for example, three filter elements 14 constituting a filter means and a secondary filter are arranged in series, and each filter element 14 can be easily removed from the casing 12 during cleaning or the like. Each can be removed so that it can be removed.
[0026]
Further, a baffle shaft 15 as a diffusing means is provided at the inlet 12a of the casing 12 so as to cross the inlet 12a. The baffle shaft 15 serves to control the flow of the dust so that the dust introduced from the duct 8 into the casing 12 is effectively diffused over the entire collection area of each filter element 14.
[0027]
That is, since the effective area of the inlet 12a side of the casing 12 gradually increases from the duct 8 toward the filter element 14, the dust introduced from the duct 8 into the casing 12 of the dust collecting unit 7 After being diffused by the synergistic effect of the shape of the inlet portion 12 a and the baffle shaft 15, it passes through the filter element 14. On the contrary, the outlet portion 12 b side of the casing 12 has its effective area from the filter element 14 toward the suction device 13. Therefore, only the air purified by passing through each filter element 14 is considered to be efficiently discharged to the outside by the suction device 13.
[0028]
Here, as the diffusing means, a simple baffle or pipe-shaped single baffle shaft 15 is used for simplification of the structure, but a plate-like one may be used if necessary, or A plurality of diffusion means may be provided.
[0029]
Therefore, according to the dust collector of the present embodiment configured as described above, the chain is driven to rotate while the trencher 3 is supported by the arm 2 of the backhoe 1 as shown in FIG. The first and second suction devices 11 and 13 of the dust device are activated to apply a predetermined suction force to the dustproof cover 6. In this state, the backhoe 1 itself has the excavating ability and is inserted into the improved soil (improved ground) G for the trencher 3, and at the same time from the discharge nozzle (not shown) at the tip of the trencher 3 for improving the ground such as cement or lime. Discharge the solidified material. Thereby, the improved soil is stirred and mixed so as to be mixed with the solidified material while being dug up repeatedly.
[0030]
At this time, since the dust cover 6 attached to the trencher 3 is in close contact with the surface of the improved ground G and surrounds the ground improved region, dust generated by the ground improvement process leaks out of the dust cover 6. Without being introduced into the dust collecting unit 7 from within the dust cover 6, only the purified air is discharged from the suction device 13 of the dust collecting unit 7.
[0031]
The dust collection process will be described in detail. The dust generated in the dust cover 6 is first collected by the primary filter 9 in the dust cover 6 and collected in the process of being sucked into the duct 8 from the dust cover 6. The Then, only the dust that has passed through the primary filter 9 is reintroduced into the dust collection unit 7 through the duct 8 and is collected by the secondary dust collection in the dust collection unit 7.
[0032]
In this secondary dust collection, as shown in FIG. 4, the dust introduced from the duct 8 to the inlet 12 a side of the casing 12 of the dust collection unit 7 has a divergent shape on the inlet 12 a side and the flow of the baffle shaft 15. Due to the synergistic effect with the control function, it is greatly diffused toward the downstream side and collected over the entire effective collection area of the filter element 14 as a secondary filter. Moreover, since the secondary filter is formed with a plurality of filter elements 14 arranged in series, most of the dust is reliably captured by any one of the filter elements 14 in the process of passing through the plurality of filter elements 14. Be collected. Then, only the air purified by the secondary collection by the filter element 14 is discharged from the suction device 13 to the outside.
[0033]
Here, the dust collected by the primary filter 9 in the dust-proof cover 6 can be dropped by its own weight, for example, by applying an appropriate vibration to the dust-proof cover 6 in a state where the operation of the suction devices 11 and 13 is stopped. In addition, at the same time, filter cleaning for preventing clogging of the primary filter 9 can be performed simultaneously by the fall of the collected dust. Accordingly, the collected dust can be reused on the spot as part of the ground improvement solidifying material, so that the yield of the solidifying material can be improved and the maintenance work of the primary filter 9 can be facilitated.
[0034]
On the other hand, the filter element 14 as a secondary filter of the dust collection unit 7 also needs to be periodically cleaned, but the dust to be collected by the filter element 14 is first collected by the primary filter 9 on the dustproof cover 6 side. Therefore, the collection load of the secondary filter is relatively small. Therefore, the cleaning frequency of the filter element 14 of the dust collection unit 7 is remarkably lower than the conventional one.
[0035]
In addition, the cleaning of the secondary filter is performed by removing the filter elements 14 from the casing 12 one by one. However, the suction filters 11 and 13 are activated and the primary filter 9 on the dustproof cover 6 side is effective. If it is functioning, it is possible to clean the filter element 14 during the operation, and it becomes unnecessary to interrupt the ground improvement work, and the loss time required for the cleaning work can be shortened.
[Brief description of the drawings]
FIG. 1 is an overall configuration explanatory view showing a preferred embodiment of a dust collector according to the present invention.
FIG. 2 is an enlarged explanatory view of the dustproof cover shown in FIG.
FIG. 3 is an explanatory plan view of FIG. 2;
4 is an enlarged explanatory view of the dust collection unit shown in FIG. 1. FIG.
FIG. 5 is a configuration explanatory view showing an example of a conventional dust collector.
[Explanation of symbols]
1 ... Backhoe (mother machine)
DESCRIPTION OF SYMBOLS 2 ... Arm 3 ... Trencher 6 ... Dust-proof cover 7 ... Dust collection unit 8 ... Duct 9 ... Primary filter 11 ... Suction device (1st suction means)
12. Casing (unit body)
12a ... Inlet part 12b ... Outlet part 13 ... Suction device (second suction means)
14 ... Filter element (secondary filter)
15 ... Baffle shaft (diffusion means)

Claims (4)

A device that collects dust generated during excavation and agitation processing by the trencher, attached to a ground improvement device equipped with a trencher for excavation and agitation at the tip of its arm using a specified construction machine as a base machine. There,
While attaching the dustproof cover surrounding the improved ground area to the trencher while touching the surface of the improved ground ,
While providing a primary filter in the dust cover,
The dust cover is connected to a dust collecting unit having a suction means and a secondary filter via a duct,
In the dust collection unit, a plurality of filter elements constituting a secondary filter are arranged in series on the upstream side of the suction means, and each filter element can be attached to and detached from the unit body independently. A dust collector of a ground improvement device characterized by the above. The ground according to claim 1, wherein a diffusion means for diffusing dust introduced from the duct over the entire dust collection area of the secondary filter is provided on the inlet side of the dust collection unit. Improved equipment dust collector. The ground improvement device according to claim 2, wherein the inlet side of the dust collection unit is formed in a divergent shape so that the opening area gradually increases toward the dust collection region of the secondary filter. Dust collector. The dust cover is provided with a first suction means together with a primary filter,
The dust collection device of the ground improvement device according to any one of claims 1 to 3, wherein the suction means of the dust collection unit functions as a second suction means .

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