JP2018193830A - Cooling device of construction machine - Google Patents

Abstract

To easily perform a maintenance work of a heat exchanger inside of a radiator and an air intake duct.SOLUTION: On an upstream side in an air circulation direction of a radiator 35, an air intake duct 40 is arranged. A heat exchanger 45 is mounted inside of the air intake duct 40. A vehicle front part of the air intake duct 40 is supported in a rotatable manner around a central axis 47 extending in a vertical direction. The air intake duct 40 is openable and closable between an open position at which a vehicle rear part of the air intake duct 40 is separated from the radiator 35 and a close position at which the vehicle rear part of the air intake duct 40 is positioned on the side of the radiator 35.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a cooling device for a construction machine.

  2. Description of the Related Art Conventionally, a construction machine is known in which an engine room is provided at the rear of the upper revolving body and an engine, a radiator, and the like are disposed in the engine room (see, for example, Patent Document 1).

  Patent Document 1 discloses a configuration in which an intake duct is provided on the upstream side of a radiator, and an air conditioner condenser and a fuel cooler are arranged inside the intake duct. Here, in order to suppress clogging of cooling devices such as radiators and condensers, an air filter is attached to the intake port of the intake duct, and clean air after removing foreign substances in the air is supplied to each cooling device. Conceivable.

  However, in an environment where fine particle dust floats, such as in an industrial disposal site or a dismantling site, the dust passes through the air filter, and the clogging of each cooling device proceeds. Therefore, for example, it is necessary to clean a radiator or the like at least twice a day.

  Specifically, as a method of cleaning the radiator, air is blown from the downstream side of the radiator, that is, from the engine fan side to the core surface of the radiator with an air gun, and dust attached to the core surface on the upstream side of the radiator is blown away. Is called.

JP 2003-20679 A

  However, when a condenser or a fuel cooler is arranged upstream of the radiator as in the invention of Patent Document 1, dust blown off from the core surface on the upstream side of the radiator is transferred to the condenser or the like in the intake duct. There exists a problem that it adheres and dust cannot be removed smoothly.

  In addition, in order to remove dust adhering to the condenser etc., even if it is attempted to remove the condenser etc. from the intake duct, there is a problem that the removal work is difficult because the condenser etc. is disposed inside the intake duct. is there.

  This invention is made | formed in view of this point, The objective is to make it easy to perform the maintenance operation | work of the heat exchanger inside a radiator or an intake duct.

  The present invention relates to a lower traveling body, an upper swing body mounted on the lower traveling body, an engine disposed in a machine room at the rear of a vehicle of the upper swing body, and the engine by taking air into the machine chamber The following solution was taken for a cooling device for a construction machine equipped with a fan for cooling.

That is, the first invention is a radiator disposed in the machine room such that the core surface faces the left-right direction of the vehicle,
An air intake duct that is disposed upstream of the radiator in the air flow direction and guides the air taken into the machine chamber toward the radiator;
A heat exchanger disposed inside the intake duct and attached to the intake duct;
An air filter attached to the intake port of the intake duct;
The intake duct is supported rotatably about a central axis extending in the vertical direction at the front portion of the intake duct in the vehicle, and an open position where the rear portion of the intake duct is separated from the radiator; and The vehicle is configured to be openable and closable with respect to a closed position where the vehicle rear portion of the intake duct is positioned on the radiator side.

  In the first invention, a central axis extending in the vertical direction is provided at the vehicle front portion of the intake duct, and the intake duct is rotatable about the central axis. Thereby, it becomes easy to perform the maintenance work of the heat exchanger disposed inside the radiator or the intake duct.

  Specifically, foreign matters are attached to the core surface on the upstream side of the radiator, and when the foreign matter is blown off by blowing air from the core surface on the downstream side of the radiator, the rear part of the intake duct is separated from the radiator. By rotating the intake duct to the open position, the radiator and the heat exchanger can be separated from each other and a cleaning gap can be provided between the radiator and the intake duct.

  As a result, even when foreign matter adhered to the core surface on the upstream side of the radiator is blown away from the core surface on the downstream side of the radiator, the blown-off foreign matter adheres to the heat exchanger inside the intake duct. Therefore, the foreign matter dropped from the core surface on the upstream side of the radiator can be easily removed from the cleaning gap.

  Similarly, for the heat exchanger inside the intake duct, an air gun is inserted from the cleaning gap provided between the radiator and the intake duct, and air is blown from the core surface on the downstream side of the heat exchanger, Foreign matter adhering to the core surface on the upstream side of the heat exchanger can be blown away and removed. It should be noted that the heat exchanger inside the intake duct may be removed and the foreign matter adhering to the heat exchanger may be directly removed.

  Further, by observing the radiator or the heat exchanger from the cleaning gap between the radiator and the intake duct, it is possible to inspect the radiator or the heat exchanger for damage.

  Furthermore, since these cleaning operations can be performed from the rear of the upper revolving unit, maintenance work can be performed from the ground without the operator getting on the upper revolving unit, and safety is high. Workability is also improved.

According to a second invention, in the first invention,
A lock member for fixing the intake duct at the closed position is provided.

  In the second aspect of the invention, the intake duct is fixed in the closed position by the lock member, thereby preventing the intake duct from opening and closing unintentionally. On the other hand, when performing maintenance work such as a radiator, And the intake duct can be rotated to the open position.

A third invention is the first or second invention, wherein
An intake pipe connecting the inside of the intake duct and the engine;
An air cleaner that is provided in the middle of the intake pipe and removes foreign matters in the air flowing through the intake pipe is provided.

  In the third invention, the intake pipe is connected to the inside of the intake duct, and an air cleaner is provided in the middle of the intake pipe. As a result, air that has passed through the air filter of the intake duct and has removed large foreign matter is sent to the air cleaner. Can do. Further, since the intake port of the intake pipe is in the intake duct, the intake noise can be reduced.

  According to the present invention, the intake duct is rotated around the central axis of the vehicle front portion of the intake duct, and a clearance is provided between the vehicle rear portion of the intake duct and the radiator so as to be disposed inside the radiator or the intake duct. It becomes easy to perform maintenance work of the heat exchanger.

It is a side view which shows the structure of the construction machine which concerns on this embodiment. It is a top view which shows the internal structure of an upper revolving body. It is a rear view which shows the internal structure of an upper turning body. It is a perspective view which shows the state which attaches a heat exchanger to the inside of an intake duct. It is a top view which shows the state which rotated the intake duct to the open position.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use. In each figure, the up / down and front / rear / left / right directions are indicated by arrows. Unless stated otherwise, the vertical direction will be described according to the directions indicated by these arrows.

  As shown in FIG. 1, the construction machine 10 includes a crawler type lower traveling body 11 and an upper revolving body 20 that is rotatably mounted on the lower traveling body 11. The upper swing body 20 is provided with an attachment 13, a cab 14, a machine room 15, an upper frame 21, and the like.

  Note that the construction machine 10 of the present embodiment is a small turning type, and the upper turning body 20 is configured to be relatively small so that the turning radius is small, and the outline of the rear part of the upper turning body 20 is viewed from above. It is formed in an arc shape.

  The attachment 13 is installed in the front part of the upper turning body 20, and is composed of a boom 13a, an arm 13b, a bucket 13c, and the like. Each of the booms 13a and the like operates in conjunction with the expansion and contraction of the hydraulic cylinder 13d that is hydraulically controlled, and performs operations such as excavation. The operation of the boom 13a and the like is performed in the cab 14.

  The cab 14 is a rectangular box-shaped cab, and is installed adjacent to the attachment 13 at the left front portion of the upper swing body 20. The machine room 15 is provided at the rear part of the upper swing body 20. The machine room 15 is partitioned by a counterweight 22 mounted along the outer peripheral edge of the rear part of the upper swing body 20 and a machine room cover 16 that covers the periphery of the machine room 15 together with the counterweight 22. The counterweight 22 is for securing a front-rear balance with the attachment 13.

  As shown in FIGS. 2 and 3, an engine 31, a radiator 35, an intake duct 40, and the like are housed in the machine room 15 in a dense state. Maintenance openings 23 are formed in the left rear portion and the right rear portion of the counterweight 22.

  The maintenance opening 23 is an opening for performing maintenance of various devices disposed in the machine room 15. The left maintenance opening 23 is opened at a position where the intake duct 40 can be visually recognized from the rear of the vehicle, and the air filter 50 can be replaced. The maintenance opening 23 on the right side is opened at a position where the engine 31 and the hydraulic pump 32 are visible from the rear of the vehicle.

  The maintenance opening 23 is closed by a rear cover 24 so as to be opened and closed. The rear cover 24 is rotatably supported by a hinge shaft 25 that extends in the vertical direction at a position on the vehicle rear side at the peripheral edge of the maintenance opening 23. By rotating the rear cover 24 around the hinge shaft 25, the vehicle front portion of the rear cover 24 can be moved rearward and the maintenance opening 23 can be opened.

  The upper frame 21 is installed at the lower part of the upper swing body 20, and the cab 14, the machine room 15, and the like are provided on the upper frame 21.

  An engine 31 is mounted in the machine room 15 via an engine mount (not shown). The engine 31 is disposed inside the machine room 15 so that its drive shaft faces the left-right direction of the vehicle. An intake port 16 a is formed in the upper left portion of the machine room cover 16. An exhaust port 16 b is formed on the upper right side of the machine room cover 16.

  Inside the machine room 15, in addition to the engine 31, a cooling device such as a hydraulic pump 32, a radiator 35, a fan 33, and an intake duct 40 is accommodated. In this construction machine 10, an intake duct 40, a radiator 35, a fan 33, an engine 31, and a hydraulic pump 32 are arranged side by side in order from the upstream side in the air flow direction.

  The interior of the machine room 15 is partitioned by a partition wall 17 into an engine room 15a in which a radiator 35, a fan 33, and an engine 31 are disposed, and an intake chamber 15b in which an intake duct 40 is disposed.

  The radiator 35 is disposed so that the core surface faces the left-right direction of the vehicle. The fan 33 is connected to the left end of the drive shaft of the engine 31 and is disposed between the engine 31 and the radiator 35. The periphery of the fan 33 is covered with a fan shroud 34, and air that has passed through the radiator 35 is guided toward the engine 31. The hydraulic pump 32 is connected to the right end portion of the drive shaft of the engine 31.

  In the construction machine 10 of the present embodiment, when the engine 31 is driven, an air flow from the left side to the right side is formed inside the machine room 15, and the engine 31 and the like are cooled by the refrigerant 35 that exchanges heat with the air. The

  Specifically, air is taken into the machine chamber 15 from the air inlet 16 a by the rotation of the fan 33. The taken-in air passes through the radiator 35, absorbs the heat of the refrigerant flowing through the radiator 35, becomes hot air, and is discharged from the exhaust port 16b to the outside of the machine room 15.

  As shown in FIG. 4, the intake duct 40 is formed in a box shape opened from the upstream side to the downstream side in the air flow direction. The intake duct 40 is disposed upstream of the radiator 35 in the air flow direction, and guides the air taken into the intake chamber 15 b toward the radiator 35.

  A seal member 38 is sandwiched between the intake duct 40 and the radiator 35 (see FIG. 2). The seal member 38 is made of a frame-like sponge material or rubber material extending along the outer peripheral edge on the downstream side of the intake duct 40, and is used to improve the sealing performance by bringing the intake duct 40 and the radiator 35 into close contact with each other. .

  In the intake duct 40, an air filter attachment portion 41 for detachably attaching the air filter 50 to the intake port of the intake duct 40 and a pair of beams for detachably attaching the heat exchanger 45 inside the intake duct 40 A portion 43 is provided.

  The air filter mounting portion 41 is disposed on a pair of guide plates 41a disposed along the upper and lower surfaces of the air filter 50, a contact plate 41b disposed on the vehicle front side, and a vehicle rear side. And a clamping plate 41c that is elastically deformable in the plate thickness direction.

  The air filter 50 is sandwiched between the contact plate 41b and the sandwiching plate 41c by elastically deforming the sandwiching plate 41c while being pushed into the air filter mounting portion 41 from the intake side of the intake duct 40.

  In the intake duct 40, a pair of beam portions 43 extending in the vehicle front-rear direction are provided at intervals in the vertical direction. Both front and rear end portions of the beam portion 43 are attached to the inner wall surface of the intake duct 40. Two screw holes 43a are formed in the beam portion 43 at intervals in the vehicle front-rear direction.

  The heat exchanger 45 is composed of, for example, a condenser for an air conditioner or a fuel cooler. The heat exchanger 45 is disposed so that the core surface faces the left-right direction of the vehicle. Two mounting brackets 45a are provided at a front portion of the heat exchanger 45 with a space in the vertical direction. Similarly, two mounting brackets 45a are provided at the rear portion of the heat exchanger 45 at intervals in the vertical direction. These four mounting brackets 45 a are provided corresponding to the four screw holes 43 a of the pair of beam portions 43.

  Then, the heat exchanger 45 is accommodated inside the intake duct 40, and the mounting bracket 45a and the beam portion 43 are fastened by the fastening bolt 46, so that the heat exchanger 45 is detachably attached to the inside of the intake duct 40. It is done. In this embodiment, the heat exchanger 45 is detachably attached to the intake duct 40. However, the heat exchanger 45 may be fixed without being detachable.

  An intake port 44 connected to the inside of the intake duct 40 is provided on the upper surface of the intake duct 40. The intake port 44 of the intake duct 40 and the engine 31 are connected by an intake pipe 52 (see FIG. 3).

  An air cleaner 55 is connected in the middle of the intake pipe 52. The air cleaner 55 is for removing foreign substances in the air supplied to the engine 31, and is disposed upstream of the intake duct 40 in the air flow direction. The air bypassed to the intake port 44 side inside the intake duct 40 is supplied to the engine 31 via the intake pipe 52 and the air cleaner 55.

  Thus, since the air after passing through the air filter 50 of the intake duct 40 and removing the large foreign matter is sent to the air cleaner 55, the amount of foreign matter in the air to be removed by the air cleaner 55 is reduced. Long life can be achieved.

  As shown also in FIG. 5, the vehicle front portion of the intake duct 40 is rotatably supported by a central shaft 47 extending in the vertical direction. The intake duct 40 is rotated about a central shaft 47 so that the vehicle rear portion of the intake duct 40 is separated from the radiator 35 and the vehicle rear portion of the intake duct 40 is positioned on the radiator 35 side to be a seal member. It is possible to open and close between the closed position close to 38.

  This facilitates maintenance work of the heat exchanger 45 disposed inside the radiator 35 and the intake duct 40.

  Specifically, in an environment where fine particle dust floats, such as at an industrial disposal site or a dismantling site, the dust passes through the air filter 50 and the clogging of the radiator 35 proceeds. Therefore, for example, it is necessary to clean the radiator 35 at least twice a day.

  Therefore, in order to remove foreign matter adhering to the core surface on the upstream side of the radiator 35, first, the intake duct 40 is rotated to the open position where the rear portion of the intake duct 40 is separated from the radiator 35. Thus, a cleaning gap is provided between the radiator 35 and the intake duct 40, and the radiator 35 and the heat exchanger 45 inside the intake duct 40 are separated from each other.

  Thereafter, air is blown from a core surface on the downstream side of the radiator 35 with an air gun (not shown) so as to blow off foreign matter adhering to the core surface on the upstream side of the radiator 35. At this time, since the radiator 35 and the heat exchanger 45 are separated from each other, it is possible to suppress the foreign matter blown off from the radiator 35 by the air gun from adhering to the heat exchanger 45 inside the intake duct 40.

  Similarly, with respect to the heat exchanger 45 inside the intake duct 40, an air gun is inserted through a cleaning gap provided between the radiator 35 and the intake duct 40, and the core surface on the downstream side of the heat exchanger 45 is inserted. By blowing air from above, the foreign matter adhering to the core surface on the upstream side of the heat exchanger 45 can be blown off and removed.

  Further, since these cleaning operations can be performed from the rear of the upper revolving unit 20, the maintenance work can be performed from the ground without the operator getting on the upper revolving unit 20 and performing the operation. Because it is possible, safety is high and workability is also improved.

  As shown in FIG. 4, the vehicle rear portion of the intake duct 40 is fixed at a closed position by a lock member 48. The lock member 48 is configured by, for example, a patch key that can be engaged across the rear side wall of the radiator 35 and the rear side wall of the intake duct 40. Two lock members 48 are provided at an interval in the vertical direction.

  In this way, by fixing the intake duct 40 in the closed position by the lock member 48, it is possible to prevent the intake duct 40 from opening and closing unintentionally, and when performing maintenance work for the radiator 35, etc. 48 can be unlocked and the intake duct 40 can be rotated to the open position.

  As described above, the present invention is extremely useful and can be used industrially because it provides a highly practical effect of facilitating maintenance work for the heat exchanger inside the radiator and the intake duct. Is expensive.

DESCRIPTION OF SYMBOLS 10 Construction machine 11 Lower traveling body 15 Machine room 20 Upper revolving body 31 Engine 33 Fan 35 Radiator 40 Intake duct 45 Heat exchanger 47 Center shaft 48 Lock member 50 Air filter 52 Intake pipe 55 Air cleaner

Claims (3)

A lower traveling body, an upper swing body mounted on the lower traveling body, an engine disposed in a machine room at the rear of the upper swing body, and a fan that takes air into the machine chamber and cools the engine A cooling device for a construction machine comprising:
A radiator disposed in the machine room such that the core surface faces the left-right direction of the vehicle;
An air intake duct that is disposed upstream of the radiator in the air flow direction and guides the air taken into the machine chamber toward the radiator;
A heat exchanger disposed inside the intake duct and attached to the intake duct;
An air filter attached to the intake port of the intake duct;
The intake duct is supported rotatably about a central axis extending in the vertical direction at the front portion of the intake duct in the vehicle, so that the vehicle rear portion of the intake duct is separated from the radiator; and A cooling device for a construction machine, which is configured to be openable and closable with a closed position in which a vehicle rear portion of an intake duct is positioned on the radiator side. In claim 1,
A cooling device for a construction machine, comprising a lock member for fixing the intake duct at the closed position. In claim 1 or 2,
An intake pipe connecting the inside of the intake duct and the engine;
A cooling device for a construction machine, comprising: an air cleaner provided in the middle of the intake pipe for removing foreign substances in the air flowing through the intake pipe.

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