JP6911524B2 - Construction machinery cooling system - Google Patents

Description

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

Conventionally, there has been known a construction machine in which an engine room is provided in the rear part of a vehicle of an upper swing body and an engine, a radiator, or the like is arranged 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 the radiator, and a condenser for an air conditioner and a fuel cooler are arranged inside the intake duct. Here, in order to prevent clogging of cooling devices such as radiators and capacitors, an air filter can be attached to the intake port of the intake duct to supply clean air to each cooling device after removing foreign substances in the air. Conceivable.

However, 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 and clogging of each cooling device progresses. Therefore, for example, it is necessary to clean the radiator and 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 toward the core surface of the radiator with an air gun, and dust adhering to the core surface on the upstream side of the radiator is blown off. It is said.

Japanese Unexamined Patent Publication No. 2003-20679

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

Further, even if an attempt is made to remove the condenser or the like from the intake duct in order to remove dust adhering to the condenser or the like, there is a problem that the removal work is difficult because the condenser or the like is arranged inside the intake duct. be.

The present invention has been made in view of the above points, and an object of the present invention is to facilitate maintenance work of a radiator and a heat exchanger inside an intake duct.

The present invention includes a lower traveling body, an upper rotating body mounted on the lower traveling body, an engine disposed in the machine room at the rear of the vehicle of the upper turning body, and an engine that takes in air into the machine room. The following solutions were taken for the cooling system of construction machinery equipped with a fan to cool the engine.

That is, the first invention includes a radiator arranged in the machine chamber so that the core surface faces the vehicle in the left-right direction.
An intake duct that is arranged 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,
It is provided with an air filter attached to the intake port of the intake duct.
The intake duct is rotatably supported around a central axis extending in the vertical direction at the front portion of the vehicle of the intake duct, so that the rear portion of the intake duct is separated from the radiator and an opening position thereof. The intake duct is characterized in that it can be opened and closed between the rear portion of the vehicle and the closed position located on the radiator side.

In the first invention, the front portion of the intake duct is provided with a central shaft extending in the vertical direction, and the intake duct is rotatable about the central shaft. This facilitates maintenance work on the heat exchangers arranged inside the radiator and the intake duct.

Specifically, foreign matter adheres to the core surface on the upstream side of the radiator, and when air is blown from the core surface on the downstream side of the radiator with an air gun to blow off the foreign matter, 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 gap for cleaning can be provided between the radiator and the intake duct.

As a result, air is blown from the core surface on the downstream side of the radiator, and even if the foreign matter adhering to the core surface on the upstream side of the radiator is blown off, the blown off foreign matter adheres to the heat exchanger inside the intake duct. The foreign matter that has fallen 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 through 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 off and removed. The heat exchanger inside the intake duct may be removed to directly remove the foreign matter adhering to the heat exchanger.

In addition, damage to the radiator and heat exchanger can be inspected by visually observing the radiator and heat exchanger from the cleaning gap between the radiator and the intake duct.

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

The second invention is the first invention.
It is characterized by including a lock member for fixing the intake duct at the closed position.

In the second invention, the intake duct is fixed in the closed position by the lock member to prevent the intake duct from unintentionally opening and closing and rattling. On the other hand, when performing maintenance work such as a radiator, the lock member is locked. Can be released to rotate the intake duct to the open position.

The third invention is the first or second invention.
An intake pipe connecting the inside of the intake duct and the engine,
It is characterized by being provided in the middle of the intake pipe and provided with an air cleaner for removing foreign matter in the air flowing through the intake pipe.

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, the air after passing through the air filter of the intake duct and removing large foreign matter is sent to the air cleaner, so the amount of foreign matter in the air to be removed by the air cleaner is reduced, and the life of the air cleaner is extended. Can be done. Further, since the intake port of the intake pipe is inside the intake duct, it is possible to reduce the intake noise.

According to the present invention, the intake duct is rotated around the central axis of the front part of the vehicle of the intake duct, and a gap is provided between the rear part of the vehicle and the radiator of the intake duct so that the intake duct is arranged inside the radiator or the intake duct. It becomes easier to perform maintenance work on 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 the upper swing body. It is a rear view which shows the internal structure of the upper swing body. It is a perspective view which shows the state which attaches the heat exchanger inside the intake duct. It is a top view which shows the state which the intake duct was rotated to an 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 essentially merely an example and is not intended to limit the present invention, its application or its use. In each figure, the up-down, front-back, left-right directions are indicated by arrows. Unless otherwise specified, the directions such as up and down 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 rotating body 20 rotatably mounted on the lower traveling body 11. The upper swivel body 20 is provided with an attachment 13, a cab 14, a machine room 15, an upper frame 21, and the like.

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

The attachment 13 is installed in the front portion of the upper swing 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 hydraulically controlled hydraulic cylinder 13d to perform work such as excavation. The operations of the boom 13a and the like are performed in the cab 14.

The cab 14 is a rectangular box-shaped driver's cab, and is installed adjacent to the attachment 13 on the left front portion of the upper swivel body 20. The machine room 15 is provided at the rear 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 portion 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 ensuring a front-rear balance with the attachment 13.

As shown in FIGS. 2 and 3, the engine 31, the radiator 35, the 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 arranged in the machine room 15. The maintenance opening 23 on the left side opens the intake duct 40 at a position where it 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 opens the engine 31 and the hydraulic pump 32 at a position where they can be visually recognized from the rear of the vehicle.

The maintenance opening 23 is closed by a rear cover 24 so as to be openable and closable. The rear cover 24 is rotatably supported by a hinge shaft 25 extending in the vertical direction at a position on the rear side of the vehicle at the peripheral edge of the maintenance opening 23. By rotating the rear cover 24 around the hinge shaft 25, the 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 below the upper swivel body 20, and the cab 14, the machine room 15, and the like are provided above the upper frame 21.

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

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 housed inside the machine room 15. In the construction machine 10, the intake duct 40, the radiator 35, the fan 33, the engine 31, and the hydraulic pump 32 are arranged side by side in this order from the upstream side in the air flow direction.

The inside 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 arranged, and an intake chamber 15b in which an intake duct 40 is arranged.

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

Specifically, air is taken into the machine room 15 from the intake port 16a 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 that opens from the upstream side to the downstream side in the air flow direction. The intake duct 40 is arranged on the upstream side in the air flow direction with respect to the radiator 35, and guides the air taken into the intake chamber 15b 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-shaped sponge material or rubber material extending along the outer peripheral edge on the downstream side of the intake duct 40, and is for bringing the intake duct 40 and the radiator 35 into close contact with each other to improve the sealing property. ..

The intake duct 40 has an air filter mounting 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 section 43 is provided.

The air filter mounting portion 41 is provided with a pair of guide plates 41a arranged along the upper and lower surfaces of the air filter 50, a contact plate 41b arranged on the front side of the vehicle, and a contact plate 41b arranged on the rear side of the vehicle. It is provided with a holding plate 41c that can be elastically deformed in the plate thickness direction.

The air filter 50 is sandwiched between the contact plate 41b and the holding plate 41c by elastically deforming the holding plate 41c while pushing the air filter 50 from the intake side of the intake duct 40 against the air filter mounting portion 41.

In the intake duct 40, a pair of beam portions 43 extending in the front-rear direction of the vehicle are provided at intervals in the vertical direction. The front and rear ends 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 front-rear direction of the vehicle.

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

Then, the heat exchanger 45 is housed inside the intake duct 40, and by fastening the mounting bracket 45a and the beam portion 43 with the fastening bolt 46, the heat exchanger 45 is detachably attached to the inside of the intake duct 40. Be done. In the present embodiment, the heat exchanger 45 is detachably attached to the intake duct 40, but it 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 matter in the air supplied to the engine 31, and is arranged on the upstream side in the air flow direction with respect to the intake duct 40. Then, 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.

In this way, 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, so that the amount of foreign matter in the air to be removed by the air cleaner 55 is reduced, and the air cleaner 55 The life can be extended.

As shown in FIG. 5, the 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 a seal member by rotating the central shaft 47 around the central shaft 47 so that the rear portion of the intake duct 40 is separated from the radiator 35 and the rear portion of the intake duct 40 is located on the radiator 35 side. It can be opened and closed with the closed position in close contact with 38.

This facilitates maintenance work on the heat exchanger 45 arranged 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 radiator 35 is clogged. Therefore, for example, it is necessary to clean the radiator 35 at least twice a day.

Therefore, in order to remove the foreign matter adhering to the core surface on the upstream side of the radiator 35, first, the intake duct 40 is rotated to an open position in which the rear portion of the intake duct 40 is separated from the radiator 35. As a result, a gap for cleaning 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.

After that, air is blown from the core surface on the downstream side of the radiator 35 with an air gun (not shown) to blow off the 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 prevent 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, for 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 the heat exchanger 45, 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 part of the vehicle of the upper swivel body 20, the maintenance work can be performed from the ground without the operator getting on the upper swivel body 20 and performing the work. Because it can be done, it is highly safe and workability is improved.

As shown in FIG. 4, the rear portion of the intake duct 40 is fixed in the closed position by the lock member 48. The lock member 48 is composed of, for example, a patchon 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 intervals in the vertical direction.

In this way, by fixing the intake duct 40 in the closed position by the lock member 48, the intake duct 40 is prevented from unintentionally opening and closing and rattling, while when performing maintenance work such as the radiator 35, the lock member is used. The lock of 48 can be released, and the intake duct 40 can be rotated to the open position.

As described above, the present invention is extremely useful and has industrial applicability because it has a highly practical effect of facilitating maintenance work of the radiator and the heat exchanger inside the intake duct. Is expensive.

10 Construction machinery 11 Lower traveling body 15 Machine room 20 Upper swivel body 31 Engine 33 Fan 35 Radiator 40 Intake duct 45 Heat exchanger 47 Central axis 48 Lock member 50 Air filter 52 Intake pipe 55 Air cleaner

Claims (3)

A lower traveling body, an upper rotating body mounted on the lower traveling body, an engine disposed in the machine room at the rear of the vehicle of the upper turning body, and a fan that takes in air into the machine room to cool the engine. It is a cooling device for construction machinery equipped with
A radiator arranged in the machine room so that the core surface faces the vehicle in the left-right direction.
An intake duct that is arranged 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,
It is provided with an air filter attached to the intake port of the intake duct.
The intake duct is rotatably supported around a central axis extending in the vertical direction at the front portion of the vehicle of the intake duct, so that the rear portion of the intake duct is separated from the radiator and an opening position thereof. A cooling device for a construction machine, characterized in that the rear part of the intake duct can be opened and closed from a closed position located 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, which is provided in the middle of the intake pipe and includes an air cleaner for removing foreign matter in the air flowing through the intake pipe.

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