KR20070023559A - Cooling device of construction machine - Google Patents

Abstract

An object of the present invention is to provide a cooling device for a construction machine that can easily open a cover body fastened by a screw to a lower portion of a shroud.

The opening 30 formed in the inclination part 29 of the lower part of the shroud 23 which forms the ventilation path between the intercooler 20, the radiator 21, the oil cooler 22, and a fan, and this opening ( The lid 31 which closes 30, the female screw part 35 provided in the inclined part 29 of the right side plate 27 of the shroud 23, and the male screw member screwed to this female screw part 35. FIG. 34 and the screw insertion part 31a which is provided in the cover body 31 corresponding to the male screw member 34, and into which the male screw member 34 is inserted. The screw insertion portion 31a is a cutout portion, and the lid 31 is moved downwardly along the inclined portion 29 in a state where the screwing of the male screw member 34 and the female screw portion 35 is loosened. In this way, the screw insertion portion 31a is detached from the male screw member 34 so that the lid 23 is released from the inclined portion 29.

Shroud, Intercooler, Radiator, Oil Cooler, Cover, Opening, Threaded Insert

Description

Cooling device for construction machinery {COOLING DEVICE OF CONSTRUCTION MACHINE}

1 is a perspective view showing a hydraulic shovel which is an example of a construction machine to which the first embodiment is applied.

Fig. 2 is a perspective view of the swinging structure shown in Fig. 1.

Fig. 3 is a perspective view of the first embodiment when the state in which the hydraulic shovel is installed in the swing frame of the hydraulic shovel is viewed from the inclined lower side.

4 is a perspective view when the first embodiment is viewed from the inclined upper side in a state where the hydraulic frame is installed on the swing frame of the hydraulic shovel;

Fig. 5 is a sectional view showing a main part of the shroud provided in the first embodiment.

6 is a plan view of the lid shown in FIG. 3;

Fig. 7 is a perspective view of the second embodiment when the state in which the hydraulic shovel is installed in the swing frame of the hydraulic shovel is viewed from below the inclination;

Fig. 8 is a sectional view showing a main part of the shroud provided in the second embodiment.

<Explanation of symbols for the main parts of the drawings>

1: hydraulic shovel (construction machinery)

3: turning body (main body)

3a: slewing frame

9: machine room

10: counterweight

11 to 13 intake port

14, 15: exhaust vent

23: shroud

27, 40: right side plate

28: plate

28a: Fan Mount

29: inclined portion

30: opening

31, 42: cover body

31a: screw insert

31b: bolt insertion hole

32, 33: elastic plate

34, 45: no external thread

34a, 45a: Cylindrical part (male thread)

34b, 45b: head portion

35, 46: female thread

36: Bolt

41: fastening part

43: installation unit

[Document 1] Japanese Patent Laid-Open No. 2003-136972 (Figs. 2 and 5)

According to the present invention, a shroud for forming a ventilation path between a fan and a heat exchanger includes an opening formed at a lower portion thereof, a lid for closing the opening, and a lid for closing the opening. The cooling machine of the construction machine which is fastened to the lower part of the shroud by screwing.

As a cooling apparatus of a construction machine, there exists a prior art described in patent document 1, for example. This prior art covers a heat exchanger for radiating heat of a fluid flowing inside, a fan disposed to face the heat exchanger and generating a cooling wind applied to the heat exchanger, and a space formed between the fan and the heat exchanger. The shroud which forms a ventilation path between a fan and a heat exchanger is provided.

The shroud has an opening formed in the lower portion thereof, a lid for closing the opening, and a fastening means for fastening the lid in the state of closing the opening to the lower portion of the shroud by screwing a male screw and a female screw. have.

The fastening means is a male screw member comprising a cylindrical portion formed with a male thread and a head portion formed at one end of the cylindrical portion, that is, a bolt, a female thread portion provided at a lower portion of the shroud and formed with a female thread, and a cover body corresponding to the female thread portion. It has a screw insertion part into which the cylindrical part of a male screw member is inserted. The female screw portion is fixed to the inner surface of the lower portion of the shroud in concentricity with a hole provided in the lower portion of the shroud. The screw insert consists of a hole.

That is, the opening is closed by the cover body from the outside of the lower part of the shroud so that the screw insertion part provided in the cover body is disposed at the position of the female screw part provided in the lower part of the shroud, and in this state, the cylindrical part of the male screw member is By inserting and screwing this cylindrical part and the female thread of the female thread part, the cover body in the state which closed the opening is fastened to the lower part of the shroud. In addition, the lid is fastened to the lower part of the shroud by a fastening means.

In the prior art configured as described above, when cleaning the heat exchanger or the fan, the worker opens the lid by removing the plurality of male screw members which fasten the lid to the lower part of the shroud while infiltrating under the main body of the construction machine. The dust accumulated in the lower part of the shroud is discharged out of the shroud from the opening of the lower part of the shroud using a blower or the like.

[Patent Document 1] Japanese Patent Laid-Open No. 2003-136972 (Figs. 2 and 5)

In the above-described prior art, the operation of opening the lid of the lower part of the shroud is performed in a state of being infiltrated below the main body of the construction machine. Since the working space formed below the main body of the construction machine is narrow, the worker is forced to bend the upper body back in a squat state, and an inconvenient posture of the posture facing upward is forced. For this reason, it was troublesome to remove the several male screw member which fastens a lid body, and to open a lid body.

The present invention has been made in consideration of the above-described circumstances, and an object thereof is to provide a cooling device for a construction machine that can easily open a lid fastened by a screw to a lower portion of a shroud.

[1] In order to achieve the above object, the present invention provides a heat exchanger provided in a cover covering a vehicle body, a fan disposed opposite to the heat exchanger to generate cooling air to be applied to the heat exchanger, the fan and the heat exchanger. A shroud that covers a space formed between the fan and the heat exchanger to form a ventilation path, wherein the shroud includes an opening formed at a lower portion thereof, a lid for blocking the opening, and a closing of the opening. In the cooling apparatus of the construction machine which has the fastening means which fastens the said cover body in the state to the lower part of the said shroud, The said fastening means is a male screw member, the female screw part provided in the lower part of the shroud, and this female screw part. Corresponding to the cover body and having a screw insertion portion into which the male screw member is inserted, wherein the screw inserting portion includes the male screw member and the female screw. It is characterized in that it consists of a cutout part which allows the movement of the said cover body in the direction which detach | deviates from the said male screw member in the state which screwed-in the screw part loosened.

In the present invention configured as described above, the screw insertion portion allows the movement of the cover object in the direction away from the male screw member in a state where the screwing of the male screw member and the female screw portion is loosened. Thereby, the lid can be opened without removing the male screw member for fastening the lid to the lower part of the shroud. Therefore, the lid can be easily opened.

[2] In order to achieve the above object, the present invention provides a heat exchanger provided in a cover that covers a vehicle body, a fan disposed to face the heat exchanger to generate cooling air to be applied to the heat exchanger, the fan and the heat exchanger. A shroud that covers a space formed between the fan and the heat exchanger to form a ventilation path, wherein the shroud includes an opening formed at a lower portion thereof, a lid for blocking the opening, and a closing of the opening. In the cooling apparatus of the construction machine which has the fastening means which fastens the said cover body in one state to the lower part of the said shroud,

The fastening means has a male screw member, a female screw portion provided on one of the shroud and the lid, and a screw insertion portion provided on the other of the shroud and the lid, into which the male screw member is inserted.

And a swing support means for swingably supporting the cover body in a state in which the screw assembly of the male screw member and the female screw portion is loosened.

In the present invention configured as described above, the swing support means is swingably supported in the direction of opening the lid in a state where the screw engagement of the male screw member and the female screw portion is loosened. In this way, the operator can open the lid by swinging the lid without removing the male screw member for fastening the lid to the lower part of the shroud and without removing the lid. Therefore, the lid can be easily opened.

[3] The present invention provides the invention described in [2], wherein the shroud is disposed to face the heat exchanger and extends from the lower end of the plate to the heat exchanger side, and extends toward the heat exchanger. A corner portion on the plate portion side is formed, and at least one of the female screw portion and the screw insertion portion is provided, and the lid is overlapped with the coupling portion and the female screw portion and the other screw insertion portion are provided. And an attaching portion, and a lid portion extending obliquely downward from the attaching portion to close the opening, wherein the swing support means is constituted by the fastening means, the fastening portion, and the attaching portion.

[First Embodiment]

EMBODIMENT OF THE INVENTION The 1st Embodiment of the cooling apparatus of the construction machine of this invention is demonstrated using drawing. 1 is a perspective view showing a hydraulic shovel which is an example of a construction machine to which the first embodiment is applied, FIG. 2 is a perspective view of the swinging structure shown in FIG. 1, and FIG. 3 is a first embodiment of a hydraulic shovel swinging. 4 is a perspective view when the state installed in the frame of the lower body is seen from the inclined lower side, FIG. 4 is a perspective view when the state which was installed in the frame of the swing body lower part of the hydraulic shovel was seen from the inclined upper side, FIG. Sectional drawing which shows the principal part of the shroud provided in 1 Embodiment, and FIG. 6 is a top view of the cover body shown in FIG.

1st Embodiment is provided in the hydraulic shovel 1 shown in FIG. As shown in Fig. 1, the hydraulic shovel 1 includes a traveling body 2 for driving by driving a crawler track 2a wound around each of the left and right sides, and a main body of the hydraulic shovel 1, that is, a traveling body. (2) a swinging body (3) serving as a vehicle body rotatably provided on the boom (5) and a boom (5) rotatably coupled to the center of the front portion of the swinging body (3) and rotatably coupled to the boom (5) A work machine 4 having an arm 6 to be used and a bucket 7 rotatably coupled to the arm 6 is provided.

The swinging body 3 is a cab 8 provided on the left side of the work machine 4, a machine room 9 provided at the rear of the cab 8 and the work machine 4, and a rear of the machine room 9. It is provided with the counterweight 10 provided in the back end of the revolving body 3, and is provided.

As shown in FIG. 2, the rear part of the machine room 9 is covered by the upper cover 9a, the left part cover 9b, and the right part cover 9c. The upper cover 9a is provided so that opening and closing is possible. The inlet port 11 for inducing air into the machine room 9 is provided in the left part of the upper cover 9a, and the inlet ports 12 and 13 are provided in the upper part of the left part cover 9b. The exhaust port 14 which guides air from the inside of the machine room 9 to the outside is provided in the right part of the upper surface of the upper cover 9a, and the exhaust port 15 is provided in the upper part of the right part cover 9c.

The first embodiment is the cooling device shown in Fig. 3, wherein the supercharged air flows inside to dissipate the heat of the air, that is, the intercooler 20, and the engine coolant flows through the inside to heat the engine coolant. A heat exchanger for radiating heat, that is, a radiator 21, and a heat exchanger for radiating heat of the hydraulic fluid, that is, an oil cooler 22, flows through the inside of the hydraulic fluid. Moreover, the fan (not shown) which produces the cooling wind to these intercooler 20, the radiator 21, and the oil cooler 22 is provided. The intercooler 20, the radiator 21, and the oil cooler 22 are arrange | positioned in parallel with the flow of a cooling wind. The fan is disposed to face the intercooler 20, the radiator 21, and the oil cooler 22.

3 and 4, the first embodiment is fixed to the revolving frame 3a forming the lower part of the revolving body 3, and the intercooler 20, the radiator 21, and the oil cooler ( 22) and a shroud 23 for covering the space formed between the fans to form a ventilation path. In Fig. 3, reference numeral 24 denotes a front side plate that forms the front side of the shroud 23, and 27 denotes a right side plate that forms the right side of the shroud 23. The right side plate 27 is disposed so as to face the intercooler 20, the radiator 21 and the oil cooler 22, and has a fan portion 28a formed by forming an annular frame portion into which a fan can be inserted. (28) and the inclined portion 29 extending downward from the lower end of the plate portion 28 to the lower left side and in contact with the lower portion of the intercooler 20, the radiator 21 and the oil cooler 22. In Fig. 4, reference numeral 25 denotes a rear side plate that forms the rear side of the shroud 23, and 26 denotes an upper plate that forms the upper part of the shroud 23.

In the left direction of the intercooler 20, the radiator 21, and the oil cooler 22 (upper left inclination in Fig. 4), the space formed between the front side plate 24 and the rear side plate 25 is the intake port 11. To 13) (see Fig. 2). This space serves as a ventilation path for guiding air introduced from the intake ports 11 to 13 to the intercooler 20, the radiator 21, and the oil cooler 22.

The upper plate 26 and the right plate 27 are disposed below the central portion of the upper cover 9a (see FIG. 2). The space between the right side plate 27 and the right side cover 9c (see Fig. 2) is an engine room in which the engine is arranged although not shown. The rotation shaft of the fan is coupled to the output shaft of the engine.

In addition, as shown in FIG. 3, in the inclination part 29 of the right side plate 27 of the shroud 23, the notch part is a part which opposes the lower part of the radiator 21 and the lower part of the oil cooler 22. As shown in FIG. The opening 30 (broken part) which consists of these is provided. This opening 30 is closed by the lid 31 of a plate shape. The edge part of one side (upper side of FIG. 3) of the long side of this cover body 31 is fastened to the inclination part 29 by the 1st fastening means mentioned later, and the edge part of the other side (lower side of FIG. 3) is The lower part of the radiator 21 and the oil cooler 22 is made to contact. In addition, the corner part of one side (left side of FIG. 3) of the short side of the lid | cover 31 is fastened to the inclination part 29 by the 2nd fastening means mentioned later, and the other edge part (right side of FIG. 3). Although not shown, is in contact with the lower part of the front side plate 24.

As shown in Fig. 5, the first fastening means is provided on the lid 31 corresponding to the male screw member 34, the female screw portion 35, and the female screw portion 35 so that the male screw member 34 is formed. It has the screw insertion part 31a (refer FIG. 6) inserted. The male screw member 34 is formed on a cylindrical portion 34a having a male screw portion (threaded thread), and a head portion formed at one end of the cylindrical portion 34a, to which torque is applied by a predetermined tool such as a spanner or a driver ( A member with 34b), for example a bolt. The female screw portion 35 is formed by fixing a cylindrical member formed with a female screw (threaded) to the inner surface of the inclined portion 29 concentrically with a hole (not shown) provided in the inclined portion 29. It has a function as a nut. The screw insertion portion 31a is a cylindrical portion (3) of the cylindrical portion 34a (male screw) of the male screw member 34 and the female screw of the female screw portion 35 in a loose state. It is formed so as to permit the movement of the lid 31 in the direction deviating from 34a, that is, in the inclined left lower direction (the arrow A direction in Fig. 6) along the inclined portion 29.

The second fastening means includes a bolt 36 (see FIG. 3), another female screw portion (not shown) provided on the inclined portion 29 and configured similarly to the female screw portion 35, and the lid 31. It is comprised by the bolt insertion hole 31b (refer FIG. 6) provided and the bolt 36 is inserted.

3 and 6, the edge portion of the lid 31 in contact with the lower portion of the radiator 21 is formed by molding an elastic plate, for example, a urethane plate or a rubber plate. The elastic plate 32 is comprised. The edge part of the cover body 31 which contacts the lower part of the oil cooler 22 is also comprised from the elastic plate 33 like the elastic plate 32. As shown in FIG. These elastic plates 32 and 33 are bent inward or outward of the shroud 23 to cover the cover member 31 at a distance sufficient to detach the screw insertion portion 31a from the cylindrical portion 34a of the male screw member 34. ) Is allowed to move.

The first embodiment configured as described above operates as follows.

The fan rotates according to the operation of the engine, and cooling air is generated. That is, it is formed between the front side plate 24 and the rear side plate 25 of the shroud 23 from the intake openings 11 of the upper cover 9a of the revolving body 3 and the reference numerals 12 and 13 of the left side cover 9b. Air is introduced into the space, which is led to the intercooler 20, the radiator 21 and the oil cooler 22. The air warmed by the heat dissipation of the intercooler 20, the radiator 21, and the oil cooler 22 is the right side plate 27 of the intercooler 20, the radiator 21, the oil cooler 22, and the shroud 23. ), The fan mounting portion 28a provided in the plate portion 28 of the right side plate 27, the exhaust port 14 and the right side cover 9c of the upper cover 9a through the engine compartment. Is discharged from the exhaust port 15.

In addition, cleaning of 1st Embodiment is performed as follows.

When cleaning each of the intercooler 20, the radiator 21 and the oil cooler 22, the operator first opens the upper cover 9a of the swinging body 3 to expose the upper part of the shroud 23. Next, the top plate 26 of the shroud 23 is removed. Next, dust attached to each of the surfaces facing the fan of the intercooler 20, the radiator 21, and the oil cooler 22 is dropped to the lower portion of the shroud 23 using a blower or the like.

Next, the cover body 31 is exposed by immersing below the main body of the construction machine and opening an under cover (not shown) covering the swing frame 3a. Next, the worker removes the bolt 36 which fastens the lid 31. Next, each male screw member 34 is loosened. Next, while bending the elastic plates 32 and 33 of the cover body 31, for example, to the inside of the shroud 23, the inclined left lower direction along the inclined portion 29 (arrow A direction in Fig. 6). The lid 31 is moved, whereby each screw insertion portion 31a of the lid 31 is detached from each male screw member 34 to open the lid 31. Next, the worker discharges dust accumulated in the lower part of the shroud 23 from the opening 30 to the outside of the shroud 23 using a blower or the like.

According to the first embodiment, the following effects can be obtained.

In the first embodiment, the screw insertion portion 31a is the male screw member 34 in a state where the screw engagement of the cylindrical portion 34a (male screw) of the male screw member 34 and the female screw of the female screw portion 35 is loosened. The cover 31 is allowed to move in the direction away from the cylindrical portion 34a. Thereby, the lid 31 can be opened without removing the male screw member 34 for fastening the lid 31 to the lower portion of the shroud 23. Therefore, the cover body 31 can be opened easily, and can contribute to the improvement of water retention property.

In 1st Embodiment, the edge part of the cover body 31 which contacts the radiator 21, and the edge part of the cover body 31 which contacts the oil cooler 22 are comprised by the elastic plates 32 and 33, respectively. . Thereby, the improvement of the sealing property in the state which closed the opening 30 by the cover body 31, and the movement of the cover body 31 in the direction which detach | deviates from the cylindrical part 34a of the male screw member 34 are carried out. Tolerance of is compatible.

In addition, in 1st Embodiment, in the edge part of the one side (upper side of FIG. 3) of the elongate side of the cover 31, the screw insertion part 31a which consists of a notch part, ie, a notch part, a male thread member. In addition to fastening the lid 31 by the 34 and the female screw portion 35, the second fastening means is provided at the corner of one side (left side in FIG. 3) of the short side of the lid 31. That is, the cover body 31 is fastened by the bolt 36, the bolt insertion hole 31b, and another female screw part (not shown). Thereby, the cover body 31 can be fixed firmly.

In addition, in 1st embodiment, the position which fastens the cover body 31 by a 2nd fastening means is the position spaced apart from the revolving frame 3a or the front side plate 24, for example, the lower part of the shroud 23. In addition, in FIG. It is installed near the center of. As a result, the worker can easily remove the bolt 36.

In addition, although 1st Embodiment is the example which provided the 2nd fastening means other than a 1st fastening means, this invention is not limited to this, You may omit a 2nd fastening means.

Second Embodiment

2nd Embodiment is described using drawing. FIG. 7 is a perspective view of a second embodiment when the state in which the hydraulic shovel is installed on the swing frame of the hydraulic shovel is seen from the inclined upper side, and FIG. In Figs. 7 and 8, the same reference numerals as those in Figs. 3 and 6 are attached to the same ones as shown in Figs.

2nd Embodiment is equipped with the hydraulic shovel 1 shown in FIG. 1 similarly to 1st Embodiment. 2nd Embodiment is a right side plate of the shroud 23, and is provided with the right side plate 40 different from 1st Embodiment.

As shown in FIG. 7, between the plate portion 28 and the inclined portion 29, a fastening portion extending from the lower end of the plate portion 28 toward the side of the intercooler 20, the radiator 21 and the oil cooler 22 ( 41) is being installed. The lid 42 to be described later is fastened to the fastening portion 41. The angle formed by the fastening portion 41 and the plate portion 28 is approximately perpendicular. Moreover, this fastening part 41 forms the edge part by the side of the board part 28 of the opening 30, as shown in FIG. The fastening portion 41 is provided with either a female screw portion or a screw insertion portion, for example, a screw insertion portion (not shown). This screw insert is made of a hole.

In addition, as shown in FIG. 8, the cover body 42 which closes the opening 30 forms the cross-sectional shape in a "へ" shape, and is superimposed on the fastening portion 41, for example, from above. An installation portion 43 to be fastened and a cover portion 44 extending downward from the installation portion 43 and contacting the lower portion of the radiator 21 and the oil cooler 22 to close the opening 30. ) Is installed. The mounting portion 43 is provided with a female screw portion 46 corresponding to the screw insertion portion of the fastening portion 41. The male screw member 45 is formed on a cylindrical portion 45a having a male screw portion (threaded thread) and at one end of the cylindrical portion 45a, and has a head portion for applying torque by a predetermined tool such as a spanner or a driver ( A member having 45b), for example a bolt. The female screw part 46 is formed in the installation part 43, and is a cylindrical member in which the female screw (thread thread) was formed concentrically with the hole (not shown) in which the cylindrical part 45a of the male screw member 45 is inserted. It is made by fixing to the inner surface of the installation part 43, and has a function as a fixing nut.

That is, the cylindrical part 45a of the male screw member 45 in the screw insertion part of the fastening part 41 in the state which the installation part 43 superimposed on the fastening part 41 so that a female screw part may be arrange | positioned in the position of a screw insertion part. ) Is inserted and the mounting portion 43 is fastened to the fastening portion 41 by screwing into the female screw portion 46 of the mounting portion 43.

That is, in the second embodiment, the fastening means for fastening the lid 42 to the lower portion of the right side plate 40 of the shroud 23 includes the above-mentioned external thread member 45, the internal thread portion 46, and the screw insertion portion. Doing. In addition, in the second embodiment, the screw body 45a (male screw) of the male screw member 45 and the female screw of the female screw portion 46 are loosened, and the direction in which the lid 42 is opened ( The swing support means for swingably supporting in the direction of arrow B) is composed of a fastening means, a fastening portion 41 and a mounting portion 53.

In the second embodiment configured as described above, the screw insertion portion and the male screw member provided in the lid 42 are loosened by loosening the female screw screw of the cylindrical portion 45a (male screw) of the male screw member 45 and the female screw portion 46. The clearance between the cylindrical portions 45a of the male screw member 45 to the radiator 21 and the oil cooler 22 side is allowed by the gap between the cylindrical portions 45a of the 45. And when the cylindrical part 45a of the male screw member 45 is inclined to the radiator 21 and the oil cooler 22 side, the cover part 44 of the cover body 42 will radiate the radiator 21 and the oil cooler 22. The lid 42 is opened by swinging in a direction (arrow B direction) spaced apart from (). In this way, the state in which the lid 42 is opened is maintained by the weight of the lid 42.

According to the second embodiment, the following effects can be obtained.

In the second embodiment, the cylindrical portion 45a of the male screw member 45 is provided by the swing support means, that is, the fastening portion 41, the mounting portion 43, the male screw member 45 and the female screw portion 46. In the state of loosening the screw of the female screw of the external thread) and the female screw part 46, the lid 42 is swingably supported in the opening direction. Thereby, the worker does not remove the male screw member 45 for fastening the lid 42 to the lower part of the shroud 23, and does not remove the lid 42 from the lower part of the shroud 23. It can be opened by rocking (42). Therefore, the cover body 42 can be opened easily, and can contribute to the improvement of water retention property.

In the second embodiment, the screw inserting portion is provided in the fastening portion 41 of the right side plate 40 of the shroud 23, and the female screw portion 46 is provided in the mounting portion 43 of the lid 42. Although the mounting portion 43 is superimposed on the fastening portion 41 from above and fastened by the male screw member 45 and the female screw portion 46 as an example of the fastening means and the swing support means, the present invention is limited thereto. The female screw part is provided in the fastening part 41, the screw insertion part is provided in the mounting part 43, and the mounting part 43 is superimposed on the fastening part 41 from the lower side by the male screw member and the female screw part. It may be tightened. In this configuration, when the screw of the female threaded portion of the cylindrical portion and the female threaded portion is loosened, the lid 44 is radiated by the radiator 21 and the oil cooler due to the gap between the screw insertion portion and the cylindrical portion of the male threaded member. The lid body 42 is allowed to swing in the direction away from the 22, and the lid body 42 swings due to its own weight.

According to the present invention, the lid can be opened in a state where the male screw member for fastening the lid to the lower part of the shroud and the screwing of the female screw are loosened. Thereby, the cover body fastened to the lower part of the shroud can be opened easily, and can contribute to improvement of water retention property.

Claims (3)

A heat exchanger provided in a cover covering the vehicle body, a fan disposed to face the heat exchanger and generating a cooling wind applied to the heat exchanger, and covering a space formed between the fan and the heat exchanger, between the fan and the heat exchanger. Having a shroud forming a ventilation path, The shroud is an apparatus for cooling a construction machine having an opening formed in the lower portion thereof, a lid for closing the opening, and a fastening means for fastening the lid in a state of closing the opening to the lower portion of the shroud. To The fastening means has a male screw member, a female screw portion provided below the shroud, and a screw insertion portion provided in the cover body corresponding to the female screw portion to insert the male screw member, The screw insertion portion is a cooling device of a construction machine, characterized in that the cut-out portion that allows the movement of the cover body in a direction away from the male screw member in the state that the screwing of the male screw member and the female screw portion is loosened. A heat exchanger provided in a cover covering the vehicle body, a fan disposed to face the heat exchanger and generating a cooling wind applied to the heat exchanger, and covering a space formed between the fan and the heat exchanger, between the fan and the heat exchanger. Having a shroud forming a ventilation path, The shroud is an apparatus for cooling a construction machine having an opening formed in the lower portion thereof, a lid for closing the opening, and a fastening means for fastening the lid in a state of closing the opening to the lower portion of the shroud. To The fastening means has a male screw member, a female screw portion provided on one of the shroud and the lid, and a screw insertion portion provided on the other of the shroud and the lid, into which the male screw member is inserted. And rocking support means for swingably supporting the cover body in a state in which the screw assembly of the male screw member and the female screw portion is loosened. 3. The shroud of claim 2, wherein the shroud is disposed opposite to the heat exchanger and at the same time extends from the lower end of the plate to the heat exchanger side and forms an edge of the opening of the opening. It has a fastening part to which either the said female screw part and the said screw insertion part are installed, The cover member has a mounting portion which overlaps the fastening portion and is provided with the female screw portion and the other of the screw insertion portion, and a lid portion extending obliquely downward from the mounting portion to close the opening. And said rocking support means is comprised of said fastening means, said fastening portion and said installation portion.

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