JP4811444B2 - Work machine - Google Patents

Description

  The present invention relates to a work machine such as a hydraulic excavator, and more particularly to a cooling structure of a control panel.

Conventionally, this type of work machine includes a type in which a control box having a built-in control panel is provided separately from the engine room (Patent Documents 1 and 2). Since such a control box is exposed to rainwater and dust, it is general that the control box is in a substantially sealed state so as to prevent intrusion of rainwater or the like.
JP-A-8-20969 JP 2003-206550 A

  However, because the control panel is assembled with relays and resistors that generate a relatively large amount of heat, in the case of such an externally installed control box, the internal temperature tends to rise. There is. Therefore, for example, in Patent Document 1, a heat radiating duct is provided so as to protrude laterally from the side surface of the control box. However, the heat exchange efficiency is not so high simply by providing a duct, and if a fan or the like is provided to forcibly ventilate, the cost increases and the structure becomes complicated. There is also a risk that rainwater or the like may enter from the duct and impair waterproofness or dustproofness.

  Further, depending on the size and mounting position of the control box, there is also a problem that the view from the driver's cab is obstructed, which hinders work. For this reason, it is preferable to make the control box as small as possible and install it at a place outside the working field of view. However, the range in which the control box can be installed is limited, and if it is made smaller, the internal volume decreases accordingly, and the temperature inside the control box further increases. It tends to rise.

  The present invention has been made in view of the above points, and its purpose is to effectively suppress an increase in internal temperature without impairing waterproofness and dustproofness, and it is an external device that is unlikely to obstruct work. An object of the present invention is to provide a working machine having a control box.

  In order to achieve the above object, in the present invention, the control box is cooled using the air sucked by the heat exchange device for cooling the engine.

Specifically, an upper swing body is provided on the lower traveling body so that the upper swing body can turn, and the upper swing body includes an operator cab, an attachment having a working device, an engine room housing an engine, and a control panel. A control box that is equipped with an air-cooled heat exchange device that cools the engine in the engine chamber, and a cover member of the engine chamber includes the heat exchange device A first opening communicating with the outside air intake is formed, and the control box is located outside the engine chamber and in the vicinity of the air flow path of the intake air of the outside air intake of the heat exchange device . It is located away from one opening and is disposed so as to cover at least a part thereof .

According to such a configuration, since the control box is located in the vicinity of the flow path of the relatively low temperature air sucked into the outside air intake, it is always cooled in contact with the flowing air. Therefore, even a relatively small control box in a substantially sealed state can be efficiently cooled using an existing apparatus, and an increase in temperature inside the control box can be effectively suppressed. Further, since the first opening is covered with the control box, it is possible to effectively prevent foreign matter from entering the engine compartment.

More specifically, the first opening may be formed in the upper part of the engine compartment, and the control box may be disposed above the first opening.

This is effective in that it can be prevented , particularly in cold regions, because snow may accumulate in the engine compartment and block the outside air intake. It is also advantageous in that the turning radius of the upper turning body is not increased by the control box because it is located above the engine compartment.

  Furthermore, it is preferable that a heat radiator is attached to the wall surface of the control box so that the heat radiator faces the air flow path side.

  This is more effective because the inside of the control box can be cooled by heat conduction by the radiator while the control box is kept in a substantially sealed state.

  In that case, it is preferable that the radiator has a plurality of fins on the air flow path side. The heat exchange efficiency is further increased, and the inside of the control box can be effectively cooled.

  In particular, the engine room is provided in a portion extending between the left and right sides of the rear part of the upper swing body, and the cab is provided on either one of the left and right sides of the front part of the upper swing body, One opening is formed on one side of the cab, and a second opening leading to the hot air discharge port of the heat exchange device is formed on the other side of the engine compartment so as to be separated from the first opening. It is preferable to keep it.

  There is a request from the cab to ensure that the field of view is as low as possible, but by providing a control box located above the engine compartment on the cab side, control from the cab is possible compared to installing on the opposite side of the cab Since the distance to the box is shortened, the lower area that can be seen from the cab can be increased accordingly. As the cooling performance is improved, the control box can be downsized, and even an external control box is unlikely to interfere with the work.

  Since the 1st opening is located away from the 2nd opening which exhausts hot air, the influence of a hot air can be avoided and a control box can be cooled efficiently.

  Among them, the upper swing body is provided with a generator for driving the working device in the vicinity of a front portion of the engine compartment and a side portion of the operator cab, and the control panel is provided with the control panel. This is effective when a generator control panel is included.

  This is because the generator is provided at a position relatively close to the control box, so that the cable connecting the two is easy and the wiring work is excellent.

  In particular, when an electromagnet is used in the working device, it is effective because a relatively large current is used and the control panel easily generates heat.

  As described above, according to the present invention, it is possible to effectively suppress the temperature rise inside the control box without impairing waterproofness and dustproofness by utilizing existing equipment, and productivity and durability can be reduced. An excellent work machine can be provided.

  Hereinafter, embodiments of the present invention will be described in detail 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.

  FIG. 1 shows an entire work machine (hereinafter also simply referred to as a lift mag machine) equipped with a lifting magnet to which the present invention is applied. This riff mug machine is used, for example, at a metal recycling site that handles iron scrap and the like.

  In this riff mag machine, an upper swing body 2 is turnably provided on a crawler type lower traveling body 1, and a cab 3 (operator's cab), an attachment 4, an engine room 5, and a control are provided on the upper swing body 2. A box 6 and the like are provided. FIG. 1 is a right side view of the riff mag machine. Hereinafter, directions such as front and rear and left and right will be described with reference to this figure.

  FIG. 2 is a plan view of the upper swing body 2. As shown in FIG. 2, the cab 3 is provided on the left side of the front portion of the upper swing body 2 (as viewed from the rear side of the work machine). Inside, a seat on which an operator is seated, an operation device, and the like are provided (not shown). The attachment 4 is provided at the center portion in the left-right direction at the front portion of the upper swing body 2 so as to be adjacent to the right side portion of the cab 3. On the opposite side of the cab 3 with respect to the attachment 4 (the front right side of the upper swing body 2), an equipment storage chamber 7, a hydraulic oil tank 8, a fuel tank 9, and the like in which hydraulic equipment is stored are provided. An engine chamber 5 is provided at the rear part of the upper swing body 2 between the left and right sides, and the front part is adjacent to the cab 3, the hydraulic oil tank 8, and the fuel tank 9 in the front-rear direction.

  The attachment 4 includes a boom 10, an arm 11 coupled to the distal end portion of the boom 10, an electromagnet 12 (working device) called a lifting magnet coupled to the distal end portion of the arm 11, and the base end of the boom 10. The part is supported by the support part 2a provided in the upper swing body 2 so as to be able to undulate.

  The electromagnet 12 has a capability of adsorbing, for example, several hundred kg to several t of iron scrap by flowing a large current. To drive the electromagnet 12, the upper swing body 2 is relatively large. A generator 13 is provided. As shown in FIG. 2, the generator 13 is provided at a portion adjacent to the front portion of the engine chamber 5 and the right side portion of the cab 3 behind the support portion 2 a.

  The engine chamber 5 includes a cover member 5 a that covers the front side, the left and right sides, and the upper side, a counterweight 5 b that covers the rear side, and the like, and a space is defined in the engine chamber 5. As shown in FIG. 3, an openable / closable guard 5c is provided on the left side of the counterweight 5b, and a bonnet 5d is provided on the top of the cover member 5a.

  Inside the engine room 5, an engine 14, a heat exchange device 15 that cools the engine 14, a hydraulic pump 19, and the like are provided. FIG. 4 is a schematic view of the inside of the engine room 5 as viewed from the rear. Inside the engine room 5, an outside air intake space 16 for taking in outside air is provided at the left end part thereof, and hot air is supplied to the right end part thereof. A hot air discharge space 17 for discharging is provided, and an air-cooled heat exchange device 15, an engine 14, and a hydraulic pump 19 are arranged in this order from the left side between the outside air intake space 16 and the hot air discharge space 17. It is arranged side by side. A pump chamber 17 a is defined on the right side of the hydraulic pump 19 adjacent to the hot air discharge space 17.

  The heat exchange device 15 includes an inner duct 18 that is open on both sides in the left-right direction, a heat exchanger 20 that is connected to an opening on the right side of the inner duct 18, and a fan 21 that is disposed on the right side of the heat exchanger 20. It has been. The inner duct 18 is attached to the cover member 5 a so as to partition the outside air intake space 16 in the engine room 5. An opening on the left side of the inner duct 18 facing the outside air intake space 16 is an outside air inlet 22, and a filter 23 is detachably attached to the outside air inlet 22. A fan case 24 is attached to the right side surface corresponding to the downstream side of the heat exchanger 20, and the fan 21 is disposed therein. An opening is formed on the right side of the fan case 24, and the opening serves as a hot air discharge port 25 for discharging heated air (hot air).

  An exhaust system 26 composed of a muffler 26a, a silencer, and the like is provided on the upper right side of the engine 14. As shown in FIG. 3, the muffler 26 a penetrates the upper part of the cover member 5 a, and its tip protrudes to the outside of the engine chamber 5, and is bent rearward so as to eject exhaust gas rearward.

  A first opening 31 that communicates with the outside air intake space 16 is formed in the cover member 5 a located at the upper left end of the engine chamber 5. On the other hand, the cover member 5 a located at the upper right end of the engine chamber 5 is formed with a second opening 32 that communicates with the hot air discharge space 17. That is, the first opening 31 and the second opening 32 are formed away from each other at the left and right ends of the engine chamber 5. A support frame 33 is attached to the first opening 31, and the support frame 33 will be described later together with the control box 6.

  In the engine room 5 configured as described above, when the fan 21 is driven, external air is sucked from the first opening 31 as shown by the arrow line in FIG. 4, and the sucked air is taken in the outside air intake space 16, It is supplied to the heat exchanger 20 through the outside air inlet 22. Air (hot air) heated by the heat exchanger 20 passes around the engine 14 and further absorbs the heat of the engine 14, passes through the hot air discharge space 17, and is discharged out of the engine room 5 through the second opening 32. The Rukoto.

  And so that it can cool effectively using this air flow, the control box 6 is the vicinity of the flow path of the air which the outside air intake port 22 of the heat exchange device 15 sucks, specifically, FIG. As shown in FIG. 6, the first opening 31 is disposed so as to cover most of the first opening 31 at a position away from the first opening 31 by a predetermined distance.

  The control box 6 is provided for the generator 13 and has a built-in control panel 34 for controlling the output of the power generated by the generator 13 to the electromagnet 12.

  As shown in FIG. 7, the control box 6 is a container-shaped main body having a rectangular box shape whose outer appearance is formed using a steel plate having relatively excellent thermal conductivity, and whose upper surface is open. It has a portion 6a and a lid portion 6b that opens and closes the opening, and is configured such that the inside is substantially sealed when the opening is closed by the lid portion 6b. In the front side wall surface of the control box 6, a lead-out hole for leading the cable 35 connecting the control panel 34 and the generator 13 is formed, and the cable 35 is led out of the control box 6 from there. On the outer surface of the left side wall of the control box 6, a plurality of display lamps 36 are provided for reporting an electrical short circuit, an abnormality in the generator 13, or the like.

  A radiator 37 made of a material having excellent thermal conductivity such as aluminum or copper is attached to the lower wall surface.

  Specifically, as shown in FIGS. 6 and 7, the radiator 37 includes a plate-like base 37a and a plurality of fins 37b and 37b formed on one surface of the base 37a so as to extend in parallel to each other. , 37b..., 37 b..., 37 b... On the lower wall surface of the control box 6 so that one surface of the fin 37 b faces the outside of the control box 6 It is attached to the opening.

  Thus, the control panel 34 is attached so as to be in close contact with the base 37a of the radiator 37. That is, since electrical components such as a relay and a resistor are assembled on the upper surface of the control panel 34, the lower surface thereof is closely fixed to the base 37a. In this embodiment, the surface area of the base 37a is larger than that of the control panel 34. Therefore, among the electrical components, the electrical component 34a of the drive system that generates a particularly large amount of heat is disposed so as to be in close contact with the base 37a or in the vicinity thereof.

  A rectangular frame-like frame body 38 is provided on the lower wall surface of the control box 6 so as to protrude downward, and the radiator 37 is located inside the frame body 38 with a sufficient space therebetween. The projecting dimension of the frame 38 from the lower wall surface of the control box 6 is set to be slightly larger than the projecting dimension of the fins 37b. Therefore, the frame 38 can protect the fins 37b from inadvertently colliding before the control box 6 is attached to the engine compartment 5, and the fins 37b are hidden after the attachment to improve the appearance. Be able to. Flange projects from the front and rear ends of the frame 38 so as to extend in the left-right direction, and attachment tools 40 are attached to a total of four locations on the left and right ends of each flange so as to protrude downward.

  The above-described support frame 33 is attached to the first opening 31 of the engine chamber 5, and the support frame 33 includes a rectangular frame-shaped frame portion 33 a disposed at a predetermined position above the first opening 31, and Four leg portions 33b having a U-shaped cross section extending downward from the frame portion 33a, and each leg portion 33b is joined to a portion around the first opening 31 in the cover member 5a. And the control box 6 is being fixed to the frame part 33a via the fixture 40 in the state which orient | assigned the lower wall surface with the fin 37b to the 1st opening 31. As shown in FIG. As shown in FIG. 2, the control box 6 fixed to the frame portion 33 a is located inside the engine chamber 5 in a plan view, and does not affect the turning radius of the upper swing body 2.

  Accordingly, the control box 6 is positioned in the vicinity of the flow path of the air sucked into the first opening 31 as indicated by the arrow lines in FIG. 5 and FIG. . Moreover, since the radiator 37 having a large number of fins 37b faces the fins 37b toward the air flow path, the control panel 34 in the control box 6 can be directly and effectively cooled.

  Since the control box 6 is held in a substantially sealed state, there is no risk of impairing waterproofness and dustproofness.

  The control box 6 is located behind the cab 3 with relatively few opportunities to see during work, and is located near the cab 3 behind the cab 3 so that it is relatively easy to secure a lower visual field.

  Specifically, if the control box 6 is located near the right end of the engine compartment 5, the control box 6 is relatively far from the cab 3, so that when the lower side of the direction is viewed from the cab 3, the control box 6 blocks the control box 6. The larger the range that can be obtained, the narrower the field of view. On the other hand, if the control box 6 is located closer to the left end of the engine compartment 5, the control box 6 is relatively close to the cab 3. Becomes smaller and the lower visual field becomes wider.

  Since the control box 6 can be downsized as much as the cooling performance is improved, the selection of the installation location and the downsizing can be combined with the external control box 6 without greatly impairing the work field of view. Therefore, the operator can work with peace of mind.

  Since the 1st opening 31 is located away from the 2nd opening 32 which discharges hot air, the influence of a hot air can be avoided and the control box 6 can be cooled efficiently.

  Further, since the control box 6 is relatively close to the generator 13, the cable 35 is easy to handle and the wiring workability is excellent.

  Since the first opening 31 is disposed so as to be covered with the control box 6, it is possible to effectively prevent foreign matter from entering the engine compartment 5. Particularly in a cold region, snow is likely to accumulate in the outside air intake space 16 and block the outside air inlet 22, which is effective in that it can be prevented. That is, the control box 6 also functions as a protective cover for the first opening 31.

  Since the control box 6 can be separately retrofitted with a relatively simple structure, it is excellent in productivity such as manufacturing cost.

  As described above, according to the present invention, it is possible to effectively suppress an increase in internal temperature without impairing waterproofness and dustproofness, and it is relatively difficult to interfere with work, and is externally controlled. A working device provided with the box 6 can be provided.

  Note that the working device according to the present invention is not limited to the above-described embodiment, and includes various other configurations.

  For example, a vent hole having a waterproof and dustproof function may be formed on the side surface of the control box 6. In combination with the radiator 37, the temperature rise inside the control box 6 can be further suppressed.

  The control box 6 may be directly attached to the support frame 33 without providing the frame body 38. The radiator 37 may be attached not only to the lower wall surface of the control box 6 but also to the side wall surface. In short, the radiator 37 may be attached to a place where the air sucked into the outside air inlet 22 flows well.

It is a side view showing the whole work machine concerning the present invention. It is a top view which shows the part of an upper revolving body. It is a perspective view which shows the part of an upper revolving body. It is the schematic which shows the inside of an engine room. It is a side view which shows the principal part of a working device. FIG. 6 is a sectional view taken along line XX in FIG. 5. It is a perspective view of a control box.

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving body 3 Cab 4 Attachment 5 Engine room 5a Cover member 5b Counterweight 6 Control box 12 Electromagnet (working device)
13 Generator 14 Engine 15 Heat Exchanger 16 Outdoor Air Intake Space 17 Hot Air Exhaust Space 18 Inner Duct 19 Hydraulic Pump 20 Heat Exchanger 21 Fan 22 Outside Air Intake 25 Hot Air Exhaust Port 31 First Opening 32 Second Opening 33 Support Frame 34 Control panel 37 Radiator 37a Base 37b Fin 38 Frame body 40 Mounting tool

Claims (7)

An upper swing body is provided on the lower traveling body so as to be able to swing. The upper swing body includes an operator's cab, an attachment having a work device, an engine room housing the engine, and a control box having a built-in control panel. A working machine provided,
The engine room is equipped with an air-cooled heat exchange device for cooling the engine,
The cover member of the engine room is formed with a first opening that leads to an outside air intake port of the heat exchange device,
The control box is located away from the first opening so as to cover at least a part thereof so that the control box is located outside the engine room and the outside air intake port of the heat exchange device is located in the vicinity of the air flow path. a work machine that is characterized in that disposed. The work machine according to claim 1,
The first opening is formed in the upper part of the engine compartment,
A work machine, wherein the control box is disposed above the first opening. The work machine according to claim 1 or 2,
A work machine characterized in that a radiator is attached to the wall surface of the control box, and the radiator faces the air flow path side. The work machine according to claim 3,
The work machine, wherein the radiator has a plurality of fins on the air flow path side. A work machine according to any one of claims 2 to 4,
The engine room is provided in a portion extending between the left and right sides of the rear part of the upper swing body,
The cab is provided on either one of the left and right sides of the front part of the upper swing body,
The first opening is formed on one side of the cab, and the second opening leading to the hot air discharge port of the heat exchange device is formed on the other side of the engine room so as to be separated from the first opening. A working machine characterized by The work machine according to claim 5,
The upper swing body is provided with a generator for driving the working device in proximity to a front portion of the engine compartment and a side portion of the cab.
A work machine, wherein the control panel includes a control panel of the generator. The work machine according to claim 6,
An electromagnet is used for the working device.

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