JP7635689B2 - Construction Machinery - Google Patents

Description

The present invention relates to a construction machine having a foreign object prevention net that covers a heat exchanger.

Conventionally, there is known a construction machine in which the engine cover is divided into an engine upper cover that is located above the engine and can be opened and closed with the counterweight side as the pivot point and the machine room side as the free end, and a heat exchanger upper cover that is located adjacent to the engine upper cover and above the heat exchanger and can be opened and closed with the side panel side as the pivot point and the machine room side as the free end, and in which the free end of the engine upper cover is arranged to overlap above the free end of the heat exchanger upper cover when the engine upper cover and the heat exchanger upper cover are closed (see, for example, Patent Document 1).

JP 2016-69964 A

However, in the construction machine of Patent Document 1, although the upper heat exchanger cover can be divided to reduce weight, there is a problem that when the upper heat exchanger cover becomes large due to the layout of the equipment, the weight is heavy and opening and closing the cover during maintenance is difficult.

The present invention was made in consideration of these points, and its purpose is to make the cover that covers the parts in the machine room lighter and easier to maintain.

To achieve the above objective, this invention provides a separate net cover for inspecting the foreign object prevention net that covers the intake side of the heat exchanger.

Specifically, the construction machine of the first invention comprises a machine body;
an engine mounted on the machine body and having a cooling fan;
a heat exchanger provided adjacent to the cooling fan;
a bonnet that covers at least the engine in an openable and closable manner;
A heat exchanger cover that is provided independently of the bonnet and covers an upper side of the heat exchanger in a detachable or openable manner;
a partition member provided between a rear surface of the heat exchanger cover and an upper surface of the heat exchanger, the partition member separating the downstream side of the heat exchanger, which is the cooling fan side, from an upstream side of the heat exchanger, which is opposite to the cooling fan;
a foreign object intrusion prevention net that covers the suction side of the heat exchanger upstream of the partition member to prevent the intrusion of foreign objects,
The heat exchanger cover is provided with a net cover which opens and closes an opening for attaching and detaching the net, which enables the foreign matter intrusion prevention net to be attached and detached.

According to the above configuration, the heat exchanger cover that covers the top of the heat exchanger is independent of the bonnet, so the bonnet does not become too large and can be opened and closed easily. In addition, the heat exchanger cover itself needs to be opened, closed, and removed when repairing the heat exchanger body, but the frequency of this is limited. For this reason, the net cover, which requires frequent maintenance to prevent clogging, can be opened and closed while the heat exchanger cover remains fixed, making it extremely easy to maintain the foreign object intrusion prevention net.

In a second aspect of the present invention, in the first aspect of the present invention,
The net attachment/detachment opening is provided over the upper surface and the side surface of the corner portion of the heat exchanger cover,
When the net cover is in an open state, at least the upper side of the foreign matter intrusion prevention net is exposed.

With the above configuration, when the net cover is opened, the opening for attaching and detaching the net provided at the corner of the heat exchanger cover is exposed, making it easy to see the foreign object prevention net and to attach and detach it.

In a third aspect of the present invention, in the first or second aspect of the present invention,
The foreign object intrusion prevention net is provided within the area of the net attachment/detachment opening in a plan view.

With the above configuration, the foreign object prevention net can be easily attached and detached from above when the net cover is open.

In a fourth aspect of the present invention, in any one of the first to third aspects of the present invention,
The heat exchanger cover covers at least the upper side of the heat exchanger, and is detachably fixed by fastening members to a top plate covering a machine chamber of the machine body.

According to the above configuration, the heat exchanger cover itself needs to be opened, closed, and removed when repairing the heat exchanger body, but the frequency of this is limited. Therefore, even when opening the net cover to attach or remove the foreign object intrusion prevention net, the upstream and downstream sides of the heat exchanger are still separated by the partition member provided between the back surface of the heat exchanger cover and the top surface of the heat exchanger, and the partition member is less likely to be damaged.

In a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention,
A pressurized tank cover that opens and closes a pressurized tank provided above the heat exchanger on the downstream side of the partition member is provided on the heat exchanger cover independently of the net cover.

With the above configuration, the heat exchanger cover itself does not need to be removed, even when refilling the pressurized tank with refrigerant, making maintenance of the pressurized tank easy. In addition, the pressurized tank cover is provided separately from the net cover, making each cover lighter.

As described above, according to the present invention, the heat exchanger cover is provided with a net cover that can be opened and closed to cover the net attachment/detachment opening that allows the foreign object intrusion prevention net to be attached and detached, making it possible to reduce the weight of the cover that covers the parts in the machine room and making maintenance easier.

2 is an enlarged perspective view showing a radiator cover and surrounding covers in a state where the covers are open in the construction machine according to the embodiment of the present invention. FIG. 2 is an enlarged perspective view showing a radiator cover and surrounding covers in a state where the covers are closed in the construction machine according to the embodiment of the present invention. FIG. FIG. 2 is a cross-sectional view showing the rear side of an upper rotating body of the hydraulic excavator according to the embodiment. FIG. 1 is a side view showing an overview of a hydraulic excavator.

The following describes an embodiment of the present invention with reference to the drawings.

Figures 1 to 4 show a hydraulic excavator 1 as a construction machine according to an embodiment of the present invention. As shown in Figure 4, the hydraulic excavator 1 comprises a lower traveling body 2 having crawlers 2a, an upper rotating body 3 as the main body of the machine which is rotatably connected to the lower traveling body 2 via a slewing bearing 5, an attachment 4 which is connected to the front side of the upper rotating body 3 so that it can be raised and lowered, and a counterweight 6 which is placed on the rear of the upper rotating body. For example, although not shown, the lower traveling body 2 may have wheels instead of the crawlers 2a, and the attachment 4 may be a bucket, a crusher, or the like, and is not limited thereto.

As shown in FIG. 3, an engine 11 that is long in one direction is mounted on the upper rotating body 3, and a radiator 12 serving as a heat exchanger is mounted adjacent to a cooling fan 17 on one side of the engine 11 in the longitudinal direction. In this embodiment, the upper part of the radiator 12 protrudes beyond the upper plate 10a of the machine room cover 10 that covers the machine room in which the engine 11 and other components are arranged.

As shown in FIG. 1, at least the upper part of the engine 11 is covered by a bonnet 14 that can be opened and closed. The bonnet 14 can swing around a bonnet hinge 14a, and can be opened by unlocking a bonnet locking member 14b and inserting a hand into a bonnet opener 14c. The bonnet 14 can be held open by a bonnet support rod 14d.

A box-shaped radiator cover 15 with at least a portion of the top surface and the bottom surface open is provided independent of the bonnet 14, and the top side of the radiator 12 is removably covered by this radiator cover 15. This radiator cover 15 covers at least the top side of the radiator 12, and its lower end is removably fixed to the top plate 10a that covers the machine room of the upper rotating body 3 by fastening members such as bolts (not shown). The top plate 10a may be made of multiple steel plates or the like, and is provided with appropriate ventilation holes or the like.

As shown in FIG. 3, a partition member 20 (shown by a dashed line in FIG. 1) is provided between the back surface (lower surface) of the radiator cover 15 and the upper surface of the radiator 12. This partition member 20 is made of, for example, foamed rubber, and serves to separate the downstream side (the cooling fan 17 side) and the upstream side (the opposite side to the cooling fan 17) of the radiator 12. The partition member 20 may be adhered to the back surface of the radiator cover 15 or to the upper surface of the radiator 12, and the material is not limited to foamed rubber, as long as it has an appropriate sealing performance.

As shown in FIG. 3, inside the machine room cover 10, the intake side of the radiator 12 upstream of the partition member 20 (i.e., the opposite side to the cooling fan 17) is covered with an insect net 21, for example a rectangular plate-shaped foreign object intrusion prevention net, to prevent foreign objects such as fallen leaves, garbage, and insects from invading the downstream radiator 12. For example, the lower end of the insect net 21 is inserted into an insect net insertion section 23 provided on the surface of the lower part of the radiator 12 opposite the cooling fan 17, and the upper end can be fixed to the top of the radiator 12 with a thumb screw 24. The insect net insertion section 23 has a shape that narrows from the top to the bottom, making it easy to insert the insect net 21.

The radiator cover 15 is provided with a net cover 22 that can be opened and closed to cover the net attachment/detachment opening 15a that allows the insect net 21 to be attached and detached. The net attachment/detachment opening 15a is provided across the top and side of the corner of the radiator cover 15. For example, the net cover 22 is made of a perforated steel plate bent into an L-shaped cross section, and can swing around the net cover hinge part 22a on the base end side, and can be locked to the radiator cover 15 by the net cover locking member 22b on the tip end side. As shown in FIG. 1, when the net cover 22 is open, at least the upper side of the insect net 21 is exposed. The insect net 21 is provided within the area of the net attachment/detachment opening 15a in a plan view.

Furthermore, a pressurized tank cover 16 that can open and close and covers the pressurized tank 13 that is located above the radiator 12 downstream of the partition member 20 is provided on the radiator cover 15 independently of the net cover 22. The pressurized tank 13 needs to be located at a higher position than the radiator 12, and its upper side protrudes beyond the upper opening 15b of the radiator cover 15. The pressurized tank cover 16 is box-shaped with an open bottom, can swing around the tank cover hinge portion 16a, and can lock the tank cover lock member 16b at the tip to the upper surface of the radiator cover 15. A tank cover handle 16c may be provided to facilitate opening and closing. The pressurized tank 13 can store the cooling water flowing through the radiator 12, and is usually provided above the radiator 12.

Next, we will explain the maintenance work for the hydraulic excavator 1 according to this embodiment.

First, we will explain the maintenance work for the insect net 21 before work starts and after work ends. The frequency of maintenance work for the insect net 21 varies depending on factors such as the amount of dust at the work site.

When carrying out maintenance work on the insect-proof net 21, with the engine 11 stopped, the net cover locking member 22b of the net cover 22 is released and the net cover is swung open around the net cover hinge portion 22a.

This exposes the net attachment/detachment opening 15a provided at the corner of the radiator cover 15. At this time, the insect net 21 is easily visible because it is provided within the area of the net attachment/detachment opening 15a in a plan view. In addition, with the net cover 22 open, the insect net 21 can be easily removed by removing the thumbscrews 24 of the insect net 21 from above, pulling it towards you, and then pulling it upwards.

When installing the insect net 21, the process is reversed.

On the other hand, in this embodiment, the radiator cover 15 itself needs to be opened, closed, and removed when repairing the radiator 12 body, but this frequency is limited, and it is usually fixed to the top panel 10a. Therefore, even when opening the net cover 22 to attach or remove the insect net 21, the partition member 20 provided between the back surface of the radiator cover 15 and the top surface of the radiator 12 keeps the upstream and downstream sides of the radiator 12 separated, making the partition member 20 less likely to be damaged and easier to maintain a sealed state.

In this embodiment, when refilling the pressurized tank 13 with refrigerant or checking the remaining amount of refrigerant, the radiator cover 15 itself does not need to be removed, making it easy to maintain the pressurized tank 13. In addition, the pressurized tank cover 16 is provided independently of the net cover 22, making each cover lighter.

In this way, the radiator cover 15 that covers the top of the radiator 12 is independent of the bonnet 14, so the bonnet 14 does not become too large and can be easily opened and closed when inspecting the engine 11. In addition, the insect net 21, which requires frequent maintenance to prevent clogging, can be opened and closed while the radiator cover 15 remains fixed, making maintenance of the insect net 21 extremely easy.

Therefore, in the construction machine according to this embodiment, a net cover 22 is provided on the radiator cover 15 to open and close the net attachment/detachment opening 15a that allows the insect net 21 to be attached and detached, making it possible to reduce the weight of the cover that covers the components in the machine room and making maintenance easier.

Other Embodiments
The present invention may be configured as follows with respect to the above embodiment.

That is, in the above embodiment, the heat exchanger is a radiator, but it is not limited to this and may be an oil cooler, an intercooler, an air conditioner condenser, etc.

In the above embodiment, the radiator cover 15 is removably fixed to the top plate 10a that covers the machine room of the upper rotating body 3 by fastening members, but a hinge may be provided to allow the radiator cover 15 to be opened and closed. However, it is more advantageous to configure the radiator cover 15 so that it is only opened and closed when repairing or replacing the radiator 12 itself, and not opened and closed during normal maintenance work, because the partition member 20 will not be damaged or deteriorated as a result of opening and closing work.

In the above embodiment, the construction machine is a hydraulic excavator 1, but is not limited to this and may be a hydraulic crane, a wheel loader, or any other construction machine having a cooling fan, heat exchanger, etc.

Note that the above embodiments are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or uses.

1. Hydraulic excavator
2. Lower running body
2a Crawler
3 Upper rotating body (machine body)
4. Attachment
5 Swivel bearing
6 Counterweight
10 Machine room cover
10a Upper plate
11 Engine
12 Radiator (heat exchanger)
13. Pressurized tank
14. Bonnet
14a Bonnet hinge part
14b bonnet lock member
14c bonnet opener
14d Bonnet support rod
15 Radiator cover (heat exchanger cover)
15a Net attachment/detachment opening
16 Pressurized tank cover
16a Tank cover hinge part
16b Tank cover lock member
16c Tank cover handle
17 Cooling fan
20 Partition member
21 Insect-proof net (net to prevent foreign objects from entering)
22 Net cover
22a Hinge part for net cover
22b Net cover locking member
23 Insect-proof net insertion part
24 Thumb screw

Claims (5)

The machine body,
an engine mounted on the machine body and having a cooling fan;
a heat exchanger provided adjacent to the cooling fan;
a bonnet that covers at least the engine in an openable and closable manner;
A heat exchanger cover that is provided independently of the bonnet and covers an upper side of the heat exchanger in a detachable or openable manner;
a partition member provided between a rear surface of the heat exchanger cover and an upper surface of the heat exchanger, the partition member separating the downstream side of the heat exchanger, which is the cooling fan side, from an upstream side of the heat exchanger, which is opposite to the cooling fan;
a foreign object intrusion prevention net that covers the suction side of the heat exchanger upstream of the partition member to prevent the intrusion of foreign objects,
A construction machine characterized in that the heat exchanger cover is provided with a net cover which opens and closes an opening for attaching and detaching the net, which enables the foreign object intrusion prevention net to be attached and detached. The heat exchanger cover has a box shape with corners,
The net attachment/detachment opening is provided over the upper surface and the side surface of the corner portion of the heat exchanger cover,
2. The construction machine according to claim 1, wherein at least an upper side of the foreign object intrusion prevention net is exposed when the net cover is open. 3. A construction machine according to claim 1, wherein the foreign object intrusion prevention net is provided within the area of the net attachment/detachment opening when viewed from above. A construction machine as described in any one of claims 1 to 3, characterized in that the heat exchanger cover covers at least the upper side of the heat exchanger and is removably fixed to a top plate covering the machine room of the machine body by fastening members. A construction machine as described in any one of claims 1 to 4, characterized in that a pressurized tank cover that can be opened and closed and covers a pressurized tank located above the heat exchanger and downstream of the partition member is provided on the heat exchanger cover independently of the net cover.