JP2014122513A - Dustproof device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dustproof device for construction machine that can suppress dust from being deposited concentrically on a center part of a dustproof net.SOLUTION: A dustproof device is attached to a hydraulic shovel including a traveling body 1 and a swiveling body 2, an operation device 3 attached to the swiveling body 2, an engine 14 which constitutes a driving source, a cooling fan 15 which is driven by the engine 14 to generate cooling air, and a heat exchanger 16 which is arranged upstream from the cooling fan 15 in a flowing direction of the cooling air, and cooled with the cooling air. The dustproof device is provided with a dustproof net 22 having a net part 22a capturing dust included in the cooling air upstream from the heat exchanger 16 in the flowing direction of the cooling air. The dustproof device includes a guide member 4 which has area of reception of the cooling air set to be smaller than the area of the net part 22a of the dustproof net 22, and guides the cooling air toward a side end 22b of the net part 22a of the dustproof net 22.

Description

  The present invention relates to a dustproof device for a construction machine, which is provided in a construction machine such as a hydraulic excavator, a wheel loader, and a crane, and includes a dustproof net that captures dust contained in cooling air that cools a heat exchanger.

  In a construction machine such as a hydraulic excavator, excavation work or the like is performed by operating actuators that respectively drive a boom, an arm, and a bucket. A hydraulic pump is driven by an engine which is a driving source, and hydraulic oil is pumped to each actuator to operate the corresponding actuator. Here, when the engine and the hydraulic pump are driven, heat is generated in the engine and hydraulic oil. In addition, excess fuel that has not been used for engine combustion returns from the engine to the fuel tank, which is very hot and must be cooled below the heat resistant temperature of the fuel tank. Therefore, heat exchangers such as a radiator, an oil cooler, and a fuel cooler are installed for cooling engine cooling water, hot working oil, and surplus fuel. The cooling air generated by the cooling fan passes through the heat exchanger, whereby the heat exchanger is cooled.

  Furthermore, considering that the concentration of nitrogen oxides and the like in exhaust gas is reduced due to recent exhaust gas regulations, construction machines equipped with an intercooler are becoming mainstream. The intercooler cools the engine intake air that is turbo-charged and adiabatically compressed to a predetermined temperature, thereby increasing the charging efficiency and lowering the combustion temperature, thereby suppressing the generation of NOx (nitrogen oxides) in the exhaust. . In addition, a condenser for cooling the refrigerant of the air conditioner may be installed.

  Such construction machines are often operated at work sites where dust is floating around, such as industrial waste treatment plants and forests. For this reason, a dustproof device having a dustproof net facing the heat exchanger on the upstream side of the cooling air in the heat exchanger so that the surrounding dust is not sucked together with the cooling air and accumulated in the heat exchanger. Is provided.

  FIG. 12 is a perspective view showing a dustproof device of a conventional construction machine, and FIG. 13 is a plan view schematically showing the arrangement of dustproof nets provided in the conventional dustproof device shown in FIG. 12 and the flow of cooling air. is there.

  The conventional dustproof devices shown in FIGS. 12 and 13 are provided in, for example, a hydraulic excavator. Although not shown, the hydraulic excavator generally includes a traveling body, a revolving body disposed on the traveling body, and a work device attached to the revolving body and rotatable in the vertical direction. A main body is constituted by the traveling body and the revolving body. For example, the engine 14 shown in FIG. 13 is mounted on the revolving structure. In addition, a hydraulic pump (not shown) driven by the engine 14 is installed, and each of the actuators that drives the traveling body, the turning body, and the work device is operated by the pressure oil discharged from the hydraulic pump.

  The hydraulic excavator is disposed on the upstream side of the cooling fan 15 with respect to the flow of the cooling air, and the cooling fan 15 that is driven by the engine 14 to generate the cooling air indicated by the thick arrow and the arrow 70 in FIG. And a heat exchanger 16 that is cooled by cooling air. The heat exchanger 16 is disposed in the shroud 48 and includes, for example, a radiator 17, an oil cooler 18, an intercooler 19, and a fuel cooler 20 disposed in a front position. A condenser 21 is also provided in parallel with the fuel cooler 20 in the shroud 48.

  As shown in FIG. 13, the dust-proof net 22 having the net portion 22 a that captures dust contained in the cooling air described above is arranged on the upstream side of the heat exchanger 16 with respect to the flow of the cooling air.

  As shown in FIG. 12, the dustproof net 22 is fixed to brackets 23 and 24 and a bracket 31 that fix the heat exchanger 16. That is, one end of the upper end portion 25 of the dustproof net 22 is fixed to the bracket 31 attached to the bracket 23 by the thumbscrew 27, and the other end of the upper end portion 25 is held by the support piece 30. The middle part 26 of the dustproof net 22 is fixed by thumbscrews 28 and 29, and the lower end part is supported by support pieces 32 and 33 attached to the bracket 24.

  As described above, the dustproof net 22 attached to the brackets 23, 24 and the like captures dust contained in the cooling air as described above. However, when dust accumulates on the dustproof net 22 and clogging occurs. As a result, the cooling air volume decreases and the cooling performance of the heat exchanger 16 decreases. Therefore, it is necessary to frequently clean the dust-proof net 22 to eliminate clogging. That is, in a construction machine having a dustproof net 22 such as a hydraulic excavator, the dustproof net 22 needs to be periodically cleaned. A configuration including the dustproof net 22 as described above is disclosed in Patent Document 1.

JP 2006-52689 A

  By the way, in the conventional technology described above, since the wind speed near the center of the cooling fan 15 is faster than the wind speed near the periphery, the amount of cooling air flowing into the dustproof net 22 as shown by the arrow 70 in FIG. It tends to increase at the central portion 22 c than at the side end portion 22 b of the dustproof net 22. Along with this, dust contained in the cooling air is likely to be concentrated and accumulated on the central portion 22c of the dustproof net 22, and the dustproof net 22 is clogged at the central portion 22c. Such clogging of the central portion 22c of the dustproof net 22 causes a decrease in the cooling performance of the heat exchanger 16 as described above. Therefore, there has conventionally been a problem that the frequency of cleaning the dust-proof net 22 tends to increase.

  The present invention has been made from the above-described actual situation in the prior art, and an object of the present invention is to provide a dustproof device for a construction machine that can prevent dust from concentrating and accumulating at the center of a dustproof net.

  In order to achieve this object, the present invention provides a main body, a working device attached to the main body, a drive source mounted on the main body, a cooling fan that is driven by the drive source to generate cooling air, and The heat exchanger is disposed upstream of the cooling fan with respect to the flow of cooling air, and is provided in a construction machine having a heat exchanger cooled by the cooling air, and upstream of the heat exchanger with respect to the flow of cooling air. An area for receiving the cooling air set smaller than the area of the net portion of the dustproof net in a dustproof device for a construction machine provided with a dustproof net having a net portion for capturing dust contained in the cooling air on the side And a guide member that guides the cooling air toward the side end portion of the net portion of the dustproof net.

  In the present invention configured as described above, the cooling air flowing in the direction of the dust-proof net is guided along the surface of the guide member so as to flow in the vicinity of the side end of the net portion of the dust-proof net. it can. The flow of the cooling air is such that the area of the guide member that receives the cooling air is smaller than the area of the net portion of the dust-proof net, and the center portion of the net portion of the dust-proof net that faces the guide member is opposed to the guide member. It can be reliably realized by forming the side end portion of the net portion not to be formed. This disperses the dust in the cooling air that tends to concentrate in the central part of the net part of the dustproof net with high wind speed in the direction of the side end of the net part of the dustproof net, and at the side end of the net part. After clogging due to dust accumulation, clogging due to dust accumulation at the center of the net part can occur, and the dust trapping period at the center part of the net part of the dustproof net can be lengthened. Can do. That is, according to the present invention, dust can be prevented from concentrating and accumulating at the center of the net part of the dustproof net, and the entire area of the net part of the dustproof net can be used as a dust trapping area. Thereby, this invention can extend the dust trappable period of the whole dustproof net, and can lengthen the cleaning interval of a dustproof net.

  Further, the present invention is the above invention, further comprising an exterior cover that opens and closes a heat exchanger chamber in which the heat exchanger is disposed, and has a vent hole through which the outside air serving as the cooling air flows. It is characterized in that it is arranged on the upstream side of the dustproof net with respect to the flow of the cooling air, and is separated from the dustproof net by a predetermined distance in consideration of the induction of the cooling air to the dustproof net. .

  According to the present invention configured as described above, the cooling air guided along the surface of the guide member is protected from the side edge of the guide member by setting the distance between the dust-proof net and the guide member to a predetermined distance. It can guide efficiently to the side edge of the net part of the net. Further, according to the present invention, by opening the exterior cover, the guide member positioned so as to face the closed exterior cover can be easily attached and detached. That is, the guide member can be removed and the dustproof net can be easily attached and detached for cleaning.

  Moreover, the present invention is characterized in that, in the above invention, the guide member is disposed at a position between the heat exchanger and the cooling fan.

  The present invention configured as described above can effectively utilize the space between the heat exchanger and the cooling fan as the arrangement space for the guide member, and includes the cooling fan, the heat exchanger, the dustproof net, and the guide member. It is possible to realize a compact arrangement structure.

  Moreover, the present invention is characterized in that, in the above-mentioned invention, a bracket for fixing the heat exchanger and a holding member for holding the guide member and being fixed to the bracket are provided.

  The present invention configured as described above can accurately set the distance between the dust-proof net and the guide member to be a predetermined distance by appropriately setting the shape of the holding member of the guide member.

  According to the present invention, in the above invention, the guide member is composed of a flat plate member, a pyramid member, or another dustproof net having a finer mesh than the mesh of the dustproof net.

  In the present invention configured as described above, when the guide member is a flat plate member, the guide member can be easily manufactured. When the guide member is a pyramid member, the cooling air can be smoothly guided along the inclined surface forming the pyramid and guided toward the side end of the net portion of the dustproof net.

  When the guide member is another dust-proof net having a finer mesh than the mesh of the dust-proof net, the guide member can be reduced in weight and easy to handle.

  In addition, when the guide member is used as another dustproof net in this way, in the initial installation stage where the guide member is attached, the cooling air mainly passes through the central portion of the guide member or partly on the surface of the guide member. After being guided, it passes through the central part and the vicinity of the side end of the dustproof net. In this state, since the mesh of the guide member is fine, dust is likely to concentrate mainly on the central portion of the guide member. Accordingly, the accumulation of dust on the center of the dustproof net is basically kept small.

  In the middle stage of the installation of the guide member with the progress of the subsequent work time, the cooling air passes through the central part of this guide member as dust gradually accumulates and accumulates in the central part of the guide member consisting of another dustproof net. However, the cooling air is guided to the peripheral portion of the central portion of the guide member, and the cooling air tends to be guided to the dustproof net through the peripheral portion. When reaching the middle stage of installation of such a guide member, the amount of cooling air guided to the central portion of the dustproof net is reduced, and the accumulation of dust at the central portion of the dustproof net is further reduced.

  In the later stage of installation of the guide member with the further progress of the work time thereafter, dust concentrates on the central part of the guide member composed of another dustproof net and the peripheral part of this central part, and thereby the guide member The cooling air hardly passes through the central portion and the peripheral portion of the central portion, and the cooling air is guided to the side end portion of the guide member. The cooling air thus guided is further guided toward the side end of the net portion of the dustproof net. Due to the above-described action, even when a guide member made of another dustproof net having a fine mesh is provided upstream of the dustproof net, it is possible to suppress the dust from being concentrated and accumulated in the central portion of the dustproof net.

  The present invention has an area for receiving cooling air that is set smaller than the area of the net portion of the dust-proof net provided on the upstream side of the heat exchanger, and guides the cooling air toward the side end of the net portion of the dust-proof net. Since the guide member is provided, it is possible to prevent the dust from being concentrated and accumulated in the central portion of the dust-proof net, and the entire area of the net portion of the dust-proof net can be used as a dust trapping area. Thereby, this invention can extend the dust trappable period of a dustproof net, and can lengthen the cleaning interval of a dustproof net compared with the past. Therefore, according to the present invention, it is possible to reduce the frequency of cleaning the dustproof net as compared with the conventional case.

It is a perspective view which shows the hydraulic excavator mentioned as an example of the construction machine with which 1st Embodiment of the dustproof apparatus which concerns on this invention is provided. It is a principal part perspective view which shows the state which opened the exterior cover with which the hydraulic shovel shown in FIG. 1 is equipped. 1 is a perspective view showing a first embodiment of a dustproof device according to the present invention. It is a top view which shows the flow of a cooling wind while showing typically the arrangement | positioning form of a dustproof net and a guide member with which 1st Embodiment is equipped. It is a perspective view which shows the guide member with which 1st Embodiment is equipped, and the holding structure of a guide member. It is a side view of the guide member shown in FIG. 5, and the holding structure of a guide member. It is a top view which shows the flow of a cooling wind while showing typically the arrangement | positioning form of a dust-proof net and a guide member with which 2nd Embodiment of the dust-proof apparatus which concerns on this invention is equipped. It is a top view which shows the flow of a cooling wind while showing typically the arrangement | positioning form of a dust-proof net and a guide member with which 3rd Embodiment of the dust-proof apparatus which concerns on this invention is equipped. It is a top view which shows the flow of the cooling air which arises in the installation initial stage of a guide member while showing typically the arrangement | positioning form of a dust-proof net and a guide member with which 4th Embodiment of the dust-proof device which concerns on this invention is equipped. It is a top view which shows the flow of the cooling air which arises in the middle stage of installation of a guide member while showing typically the arrangement | positioning form of a dust-proof net and a guide member with which 4th Embodiment of the dust-proof device which concerns on this invention is equipped. It is a top view which shows the flow of the cooling air produced | generated in the latter stage of installation of a guide member while showing typically the arrangement | positioning form of a dust-proof net and a guide member with which 4th Embodiment of the dust-proof device which concerns on this invention is equipped. It is a perspective view which shows the dustproof apparatus of the conventional construction machine. It is a top view which shows the flow of a cooling air while showing typically the arrangement | positioning form of the dustproof net with which the conventional dustproof apparatus shown in FIG. 12 is equipped.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a dustproof device for a construction machine according to the present invention will be described with reference to the drawings.

[First Embodiment]
1 is a perspective view showing a hydraulic excavator cited as an example of a construction machine provided with the first embodiment of the dustproof device according to the present invention, and FIG. 2 shows a state in which an exterior cover provided in the hydraulic excavator shown in FIG. 1 is opened. It is a principal part perspective view shown.

  The construction machine provided with the dustproof device according to the first embodiment of the present invention is, for example, a small hydraulic excavator shown in FIGS. The hydraulic excavator includes a traveling body 1 and a revolving body 2 disposed on the traveling body 1. The traveling body 1 and the revolving body 2 constitute a main body. The swivel body 2 is provided with a working device 3 that is pivotable in the vertical direction and that performs excavation work of earth and sand. This working device 3 includes a boom 3a attached to the swing body 2, an arm 3b attached to the tip of the boom 3a, and a bucket 3c attached to the tip of the arm 3b. The revolving body 2 includes an engine chamber 8, a heat exchanger chamber 9 that is connected to the engine chamber 8 and disposed outside the engine chamber 8, and an exterior cover 10 that opens and closes the heat exchanger chamber 9. Is provided. The exterior cover 10 has a vent hole 11 into which outside air that serves as cooling air described later flows.

  FIG. 3 is a perspective view showing the first embodiment of the dustproof device according to the present invention, and FIG. 4 schematically shows the arrangement of the dustproof net and the guide member provided in the first embodiment and the flow of cooling air. FIG. 5 is a perspective view showing a guide member and a guide member holding structure provided in the first embodiment, and FIG. 6 is a side view of the guide member and the guide member holding structure shown in FIG.

  As shown in FIGS. 3 and 4, the present embodiment has an area for receiving cooling air that is smaller than the area of the net portion 22 a of the dustproof net 22, and the cooling wind is applied to the side end portion 22 b of the net portion 22 a of the dustproof net 22. A guide member 4 for guiding in the direction is provided.

  For example, the guide member 4 of this embodiment is attached so as to be added to the fixing structure of the dustproof net 22 shown in FIGS. Accordingly, the fixing structure of the dustproof net 22 and the arrangement relationship of the heat exchanger 16, the cooling fan 15, the engine 14 and the like are the same as those shown in FIGS. To do. In the following, description will be made using the reference numerals shown in FIGS.

  The guide member 4 described above is formed of, for example, a rectangular flat plate member. As shown in FIG. 4, the guide member 4 is disposed upstream of the dust-proof net 22 with respect to the flow of cooling air, and a predetermined distance, for example, 50 mm, taking into account the induction of the cooling air of the dust-proof net 22. As described above, they are arranged away from the dustproof net 22.

  As shown in FIGS. 3, 5, and 6, the guide member 4 is held on one holding member 38 of the pair of holding members 38 and 39 by fastening bolts 34 and 35, and the other holding member 39 has a bolt 36. , 37 are held. The upper end portion of the holding member 38 is fixed to the bracket 23 that fixes the heat exchanger 16 by fastening bolts 40 and 41, and the upper end portion of the holding member 39 is fastened to bolts 42 and 43, respectively. The lower end of the holding member 38 is fixed to the bracket 24 for fixing the heat exchanger 16 by fastening bolts 44 and 45, and the lower end of the holding member 39 is fastened by fastening bolts 46 and 47, respectively.

  As shown in FIG. 4, the first embodiment configured as described above is sucked into the heat exchanger chamber 9 from the cooling air generated by the cooling fan 15 driven by the engine 14, that is, from the vent 11 of the exterior cover 10. The cooling air indicated by the arrow 60 flowing in the direction of the dust-proof net 22 is guided along the surface of the guide member 4, and dust-proof as indicated by the arrow 61 from each side end 4 a of the guide member 4. It can be made to flow in the vicinity of the side end 22 b of the net 22. Such a flow of cooling air makes the area of the guide member 4 that receives the cooling air smaller than the area of the net portion 22 a of the dust-proof net 22, and the central portion of the net portion 22 a of the dust-proof net 22 that faces the guide member 4. By forming 22c and the side end portion 22b of the net portion 22a that does not face the guide member 4, it can be surely realized.

  Thereby, 1st Embodiment distributes the dust which tends to concentrate on the center part 22c of the net part 22a of the dustproof net 22 with a high wind speed in the direction of the side edge part 22b of the net part 22a of the dustproof net 22. After the clogging due to the dust accumulation at the side end portion 22b of the net portion 22a, the clogging due to the dust accumulation at the central portion 22c of the net portion 22a can occur. The dust trappable period in the central part 22c of the part 22a can be lengthened. That is, according to the first embodiment, it is possible to prevent dust from being concentrated and accumulated on the central portion 22c of the net portion 22a of the dustproof net 22, and the entire area of the net portion 22a of the dustproof net 22 is used as a dust capturing region. It can be utilized. Accordingly, the dust trapping period of the entire dustproof net 22 can be extended. Therefore, according to 1st Embodiment, the cleaning interval of the dustproof net 22 can be lengthened, and the cleaning frequency of the dustproof net 22 can be decreased.

  In the first embodiment, the distance between the dust-proof net 22 and the guide member 4 is set to a predetermined distance in advance, so that the cooling air guided along the surface of the guide member 4 is guided as described above. The side end portion 4a of the dustproof net 22 can be efficiently guided to the side end portion 22b of the net portion 22a. As shown in FIGS. 1 and 2, by opening the exterior cover 10, the guide member 4 positioned so as to face the closed exterior cover 10 can be easily attached and detached. That is, the guide member 4 can be removed and the dust-proof net 22 can be easily attached and detached for cleaning.

  Moreover, this 1st Embodiment can set the space | interval of the dust-proof net 22 and the guide member 4 to a predetermined distance accurately by setting the shape of the holding members 38 and 39 of the guide member 4 suitably, Stable cooling air flow performance can be ensured.

  Further, in the first embodiment, since the guide member 4 is made of a flat plate member having a simple shape, the guide member 4 can be easily manufactured and is practical.

[Second Embodiment]
FIG. 7 is a plan view schematically showing the arrangement of the dustproof net and the guide member provided in the second embodiment of the dustproof device according to the present invention and the flow of cooling air.

  In the second embodiment shown in FIG. 7, a guide member 4 </ b> A made of a flat plate member similar to that of the first embodiment is arranged at a position between the heat exchanger 16 and the cooling fan 15. Other configurations are the same as those of the first embodiment described above.

  In the second embodiment, the cooling air is guided from the vent 11 of the exterior cover 10 and flows in the direction of the dustproof net 22, passes through the dustproof net 22 and the heat exchanger 16, and is guided to the surface of the guide member 4 </ b> A. Flows along the surface of the guide member 4A and flows in the direction of the cooling fan 15 from each of the side end portions 4Aa of the guide member 4A as indicated by an arrow 62, whereby the cooling air is supplied to the net portion of the dustproof net 22. It can be made to flow in the vicinity of the side end 22b of 22a. Thereby, like 1st Embodiment, it can suppress that dust concentrates and accumulates in the center part 22c of the net part 22a of the dust-proof net 22, and can capture dust in the center part 22c of the net part 22a of the dust-proof net 22 The period can be lengthened.

  Moreover, according to this 2nd Embodiment, the space between the heat exchanger 16 and the cooling fan 15 can be utilized effectively as arrangement | positioning space of 4 A of guide members, and the cooling fan 15, the heat exchanger 16, dust-proof The arrangement structure including the net 22 and the guide member 4A can be made compact.

[Third Embodiment]
FIG. 8 is a plan view schematically showing the arrangement of the dustproof net and the guide member provided in the third embodiment of the dustproof device according to the present invention and the flow of cooling air.

  In the third embodiment shown in FIG. 8, a guide member 4 </ b> B made of a pyramidal member, for example, a quadrangular pyramid member, is provided on the upstream side of the dust-proof net 22. Other configurations are the same as those in the first embodiment.

  In the third embodiment, as in the first embodiment, the cooling air guided from the vent 11 of the exterior cover 10 is guided along the surface of the guide member 4B, that is, along the inclined surface. As indicated by an arrow 63 from each side end 4Ba of the guide member 4B, it can flow into the vicinity of the side end 22b of the dustproof net 22. Therefore, the same effect as in the first embodiment can be obtained.

  In the third embodiment, since the guide member 4B is formed of a quadrangular pyramid member, the cooling air guided to the guide member 4B is smoothly guided along the inclined surface that forms the quadrangular pyramid, and the dustproof net 22 is provided. The net portion 22a can be guided toward the side end portion 22b. Thereby, the flow resistance of the cooling air with respect to the guide member 4B can be reduced, and excellent flow performance of the cooling air can be ensured.

[Fourth Embodiment]
FIG. 9 is a plan view schematically showing the arrangement of the dust-proof net and the guide member provided in the fourth embodiment of the dust-proof device according to the present invention, and the flow of cooling air generated at the initial stage of installation of the guide member. Fig. 11 is a plan view showing the flow of cooling air generated in the middle stage of installation of the guide member, schematically showing the arrangement of the dust-proof net and the guide member provided in the fourth embodiment of the dust-proof device according to the present invention. It is a top view which shows the flow of the cooling air which arises in the latter stage of installation of a guide member while showing typically the arrangement | positioning form of a dust-proof net and a guide member with which 4th Embodiment of the dust-proof device which concerns on invention is equipped.

  In the fourth embodiment, the guide member 4 </ b> C shown in FIGS. 9 to 11 is configured by another dustproof net having a finer mesh than the mesh of the dustproof net 22. Other configurations are the same as those of the first embodiment described above.

  In the fourth embodiment, in the initial stage of installation shown in FIG. 9 immediately after the guide member 4C made of another dustproof net is attached to the brackets 23 and 24, the cooling air guided from the vent 11 of the exterior cover 10 is used. Flows mainly after passing through the central portion 4Cb of the guide member 4C as indicated by the arrow 64, or partially guided by the surface of the guide member 4C as indicated by the arrow 65 and around the side end portion 4Ca. After that, the dust-proof net 22 passes through the central portion 22c and the vicinity of the side end portion 22b. In this state, since the mesh of the guide member 4C is fine, the dust tends to concentrate on the central portion 4Cb of the guide member 4C. Accordingly, dust accumulation on the central portion 22a of the dustproof net 22 is basically kept small.

  In the middle of the installation of the guide member 4C shown in FIG. 10 as the subsequent work time elapses, the dust concentrates and accumulates on the central portion 4Cb of the guide member 4C formed of another dustproof net, so that the center of the guide member 4C is collected. It becomes difficult for the cooling air to pass through the portion 4Cb, the flow of the cooling air moves to the peripheral portion of the central portion 4Cb of the guide member 4C, and the cooling air tends to be guided to the dust-proof net 22 through the peripheral portion. It becomes. When reaching the middle stage of installation of the guide member 4C, the amount of cooling air guided to the central portion 22c of the dustproof net 22 decreases. Therefore, the dust is less likely to concentrate and accumulate on the central portion 22c of the dustproof net 22.

  In the later stage of installation of the guide member 4C shown in FIG. 11 with further progress of the work time thereafter, dust concentrates on the central part 4Cb of the guide member 4C made of another dustproof net and the peripheral part of the central part 4Cb. By accumulating, it becomes difficult for the cooling air to pass through the central portion 4Cb of the guide member 4C and the peripheral portion of the central portion 4Cb, and the cooling air is guided to the side end portion 4Ca of the guide member 4C. The cooling air thus guided is further guided toward the side end portion 22b of the net portion 22a of the dustproof net 22.

  As described above, in the fourth embodiment in which another fine dust net having a fine mesh is provided as the guide member 4C upstream of the dust net 22, the dust concentrates on the central portion 22c of the dust net 22 as in the first embodiment. It can suppress that it accumulates.

  In the fourth embodiment, since the guide member 4C is formed of another dustproof net, the guide member 4C can be reduced in weight and easy to handle.

1 Running body (main body)
2 Revolving body (main body)
3 working device 4 guide member 4a side end 4A guide member 4Aa side end 4B guide member 4Ba side end 4C guide member 4Ca side end 4Cb central portion 10 exterior cover 11 vent 14 engine (drive source)
DESCRIPTION OF SYMBOLS 15 Cooling fan 16 Heat exchanger 17 Radiator 18 Oil cooler 19 Intercooler 20 Fuel cooler 21 Capacitor 22 Dustproof net 22a Net part 22b Side end part 22c Central part 23 Bracket 24 Bracket 27 Butterfly screw 28 Butterfly screw 29 Butterfly screw 34 Bolt 35 Bolt 36 Bolt 37 Bolt 38 Holding member 39 Holding member 40 Bolt 41 Bolt 42 Bolt 43 Bolt 44 Bolt 45 Bolt 46 Bolt 47 Bolt

Claims (5)

A main body, a working device attached to the main body, a drive source mounted on the main body, a cooling fan driven by the drive source to generate cooling air, and upstream of the cooling fan with respect to the flow of the cooling air Provided on a construction machine having a heat exchanger disposed on the side and cooled by the cooling air,
In a dustproof device for a construction machine provided with a dustproof net having a net portion for capturing dust contained in the cooling air on the upstream side of the heat exchanger with respect to the flow of the cooling air,
A guide member having an area for receiving the cooling air set smaller than an area of the net portion of the dustproof net and guiding the cooling air toward the side end of the net portion of the dustproof net. A dustproof device for construction machinery. The dustproof device for a construction machine according to claim 1,
It has a vent hole through which the outside air that becomes the cooling air flows, and has an exterior cover that opens and closes a heat exchanger chamber in which the heat exchanger is arranged,
The guide member is arranged on the upstream side of the dustproof net with respect to the flow of the cooling air, and is separated from the dustproof net by a predetermined distance in consideration of the induction of the cooling air to the dustproof net. A dustproof device for a construction machine. The dustproof device for a construction machine according to claim 1,
A dustproof device for a construction machine, wherein the guide member is disposed at a position between the heat exchanger and the cooling fan. The dustproof device for a construction machine according to claim 2,
A bracket for fixing the heat exchanger;
A dustproof device for a construction machine, comprising: a holding member that holds the guide member and is fixed to the bracket. The dustproof device for a construction machine according to claim 4,
The dust-proof device for a construction machine, wherein the guide member comprises a flat plate-shaped member, a pyramid-shaped member, or another dust-proof net having a finer mesh than the mesh of the dust-proof net.