JP4729419B2 - Dust-proof net for heat exchanger - Google Patents

Description

  The present invention relates to a dust-proof net for a heat exchanger mounted on a work machine such as a hydraulic excavator.

  Conventionally, in working machines such as hydraulic excavators, cooling air is circulated through a heat exchanger including a radiator and an oil cooler to cool engine cooling water and hydraulic oil. For example, an opening for taking in outside air is provided on the side of the fuselage, a heat exchanger is arranged inside the opening, and cooling air from the outside of the fuselage is sucked in by an engine-driven cooling fan, and the cooling air is drawn into the heat exchanger Cooling is done through the internal core.

  By the way, in construction work sites, civil engineering work sites, demolition work sites such as buildings, etc., dust and dust may be generated along with the work. In the work machine placed at such a work site, when outside air mixed with dust or dust is taken into the machine body as cooling air, the core of the heat exchanger may be clogged and cooling efficiency may be reduced. Therefore, a dustproof net for removing dust and dust is attached to the upstream side of the cooling air with respect to the heat exchanger inside the machine body of the work machine.

For example, Patent Document 1 and Patent Document 2 describe a working machine provided with a detachable dust-proof net on the front side of a heat exchanger. In these technologies, two dust-proof nets (net divided bodies) divided in the width direction (left-right direction) of the heat exchanger are attached side by side, and each dust-proof net can be attached and detached individually. In other words, by dividing the dustproof net, the dustproof net can be attached and detached in a relatively small space around the heat exchanger, and the accessibility to the heat exchanger is improved.
JP 2003-322488 A Japanese Patent No. 3553782 (Japanese Patent Laid-Open No. 11-190215)

However, in a working machine equipped with the conventional dustproof net as described above, the core of the heat exchanger cannot be directly accessed unless the dustproof net is removed from the machine body during cleaning and maintenance of the heat exchanger. Therefore, it takes time and labor to attach and remove the dustproof net, and there is a problem that the work is complicated.
In addition, the removable dustproof net as described above requires a place to temporarily place it when it is removed from the airframe. However, for example, when a work machine is performing excavation work at a civil engineering work site, etc., the entire periphery of the work machine may be covered with earth and sand related to the work. In some cases, the temporary storage space cannot be taken and the heat exchanger maintenance work itself cannot be performed.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a dust-proof net for a heat exchanger that can be easily cleaned and maintained with a simple configuration. And

  In order to achieve the above object, a dustproof net for a heat exchanger according to the first aspect of the present invention is a dustproof net interposed on a flow path of cooling air guided to a heat exchanger of a work machine, and is horizontally long. A net member composed of a plurality of net pieces that are juxtaposed in the vertical direction on the front surface of the heat exchanger and are connected to each other so as to be bendable, and extends horizontally along the upper end of the net member A shaft member (winding shaft member) that supports the upper end of the net member and suspends the net member, and an arbitrary shaft that is fixed to the machine body of the work machine and that is parallel to the extending direction of the shaft member And a fixing member (fixed frame) that is rotatably supported around the center.

In this case, the means for rotating the shaft member is arbitrary. For example, a handle for manually rotating the shaft member may be attached to the end of the shaft member, or a rotation drive device such as an electric motor may be attached. You may add it.
The dust-proof net of the heat exchanger of the present invention according to claim 2 is characterized in that the net member has a connecting member that rotatably connects the plurality of net pieces.

The dust-proof net of the heat exchanger of the present invention according to claim 3 has an outer shape in which the shaft member forms a polygonal column shape (for example, a triangular prism shape) together with the net piece closest to the shaft member among the plurality of net pieces. It is characterized by having.
According to a fourth aspect of the present invention, there is provided a dustproof net for a heat exchanger according to the present invention, wherein the plurality of net pieces are formed such that the net pieces located below the net member have longer short sides. .

  The dust-proof net of the heat exchanger of the present invention according to claim 5 further includes a fixing member (fixing screw) for fixing the net member and the fixing member.

  According to the dust-proof net (Claim 1) of the heat exchanger of the present invention, when the shaft member is rotated with respect to the fixed member, the net member can be wound around the shaft member. Thereby, since the front surface of the heat exchanger is opened almost completely, access to the heat exchanger is facilitated. At this time, since it is not necessary to remove the net member, the heat exchanger can be easily cleaned and maintained. Further, the configuration is simple and the cost can be reduced.

In addition, when returning the net member wound up after the cleaning operation or maintenance, the net member can be suspended from the shaft member by its own weight by rotating the shaft member in the opposite direction to that during winding. It is also easy to arrange the net member so as to cover the front surface of the heat exchanger again.
Further, according to the dust-proof net of the heat exchanger of the present invention (Claim 2), since the plurality of net pieces are connected by the connecting member, it can be easily bent at the position where the connecting member is disposed. . That is, for example, even if the material and shape of each net piece does not have the ease of bending (softness and flexibility) that is easy to wind, the entire net member can be easily wound.

Moreover, according to the dust-proof net (Claim 3) of the heat exchanger of the present invention, the net member can be wound into a polygonal shape. For example, when the net pieces are planar, the material and shape of each net piece does not have easy-to-wind folding properties (softness and flexibility), and the polygons have the net pieces as sides. It is easy to wind the net member into the shape.
In addition, according to the dust-proof net of the heat exchanger of the present invention (Claim 4), the length of the short side of the net piece is set longer toward the lower side and shorter toward the upper side. The winding diameter at the time can be reduced. That is, the net member can be compactly wound, and the accessibility to the heat exchanger can be improved.

  Further, according to the dust-proof net of the heat exchanger of the present invention (Claim 5), the movement of the net member with respect to the fixing member is restrained so that the front surface of the heat exchanger is left open or closed (that is, The front surface of the heat exchanger can be kept covered with a net member).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6 illustrate a dustproof net of a heat exchanger according to an embodiment of the present invention. FIG. 1 is a perspective view of the dustproof net, and FIG. 2 is a cross-sectional view of the dustproof net when closed. 4 is a cross-sectional view of the dust-proof net when it is opened (C-C cross-sectional view of FIG. 5), and FIG. 4 is a front view of the dust-proof net (viewed in the direction of arrow D in FIG. 6). FIG. 5 is a front view of the dustproof net when the heat exchanger is cleaned, and FIG. 6 is a perspective view of a hydraulic excavator to which the dustproof net is attached.

[Constitution]
(overall structure)
The dustproof net 1 is applied to a hydraulic excavator 10 shown in FIG. The hydraulic excavator 10 includes a lower traveling body 11 equipped with a crawler type traveling device, and an upper revolving body 12 that is rotatably mounted on the lower traveling body 11. A working device 13 such as a boom or an arm is provided on the front side of the upper swing body 12, and an engine room 14 is formed on the rear side. Note that a door 19 having a slit-like opening 18 for taking in outside air is provided on the body cover that covers the engine room 14.

Inside the engine room 14 are provided an engine 15 that is a drive source of the excavator 10, a cooling fan 16 that is driven by the engine 15, a cooling package (heat exchanger) 17, and a dust-proof net 1.
The cooling fan 16 is a suction-type axial fan that takes outside air as cooling air into the engine room 14 from the opening 18. The engine 15 is disposed on the downstream side of the cooling air from the cooling fan 16, while the cooling package 17 is disposed on the upstream side of the cooling fan 16.

  The cooling package 17 is a cooling device in which a plurality of heat exchangers such as a radiator, an oil cooler, and an intercooler are superposed. A large number of heat dissipating fins are formed in the core (central portion), and cooling air is circulated through the core to cool engine cooling water and hydraulic oil. Further, on the further upstream side of the cooling package 17, a dustproof net 1 for removing dust, dust, dead leaves, insects and the like contained in the cooling air is attached.

(Dust-proof net configuration)
As shown in FIG. 1, the dustproof net 1 includes a net member 2, a winding shaft member (shaft member) 3, and a fixed frame (fixing member) 4.
The net member 2 is composed of a plurality of net pieces (planar nets) having a horizontally long strip shape (rectangular planar shape). As shown in FIG. 4, the plurality of net pieces are arranged so as to cover the entire front surface of the cooling package 17 with their long sides (upper and lower sides) adjacent to each other vertically. .

  Each net piece includes a net-like net surface 2a knitted vertically and horizontally by a wire made of a metal material or a resin material, a shaft-like connecting member 2b that connects net pieces juxtaposed in the vertical direction, and a net In order to suspend the surface 2a from the connecting member 2b, an annular portion 2c formed with a diameter larger than the shaft diameter of the connecting member 2b at the upper and lower ends of both short sides (left and right end sides) of the net surface 2a is provided. Composed. The mesh of the net surface 2a is set to be fine enough to allow dust and dust in the outside air to be captured while allowing the cooling air to pass through without substantial resistance. Further, in the present embodiment, each net piece is formed with a predetermined rigidity that is not easily bent by hand.

  As shown in FIG. 1, the connecting member 2 b extends horizontally along the upper end (or lower end) of each net piece, and is inserted through the ring portion 2 c at the lower end portion of the net piece arranged above the net piece. In addition, the upper and lower net pieces are rotatably connected to each other by being inserted into the ring portion 2c at the upper end of the net piece disposed below the net piece. In this way, the net pieces are rotatably connected to each other, and the entire net member 2 can be bent in the horizontal direction. Although illustration is omitted here, a detachment preventing member is fixed to both ends of the connecting member 2b so that the ring portion 2c does not fall off.

A winding shaft member 3 extending in the horizontal direction along the upper end of the net member 2 is provided at the uppermost portion of the net member 2. The take-up shaft member 3 is a member that supports the entire net member 2 in a suspended state. As shown in FIG. 1, the take-up shaft member 3 includes a take-up portion 3a, a rotating shaft 3b, and a suspended portion 3c. Yes.
The winding part 3a is a columnar member extending in the horizontal direction and having a V-shaped cross section. That is, the winding shaft member 3 has an outer shape that forms a substantially triangular prism shape together with the nearest net piece (the uppermost net piece).

  The rotating shaft 3b is a shaft-like member inserted into the winding portion 3a substantially in parallel with the extending direction of the winding portion 3a, and is fixed to the winding portion 3a. As shown in FIG. 1, the suspended portion 3 c is a member formed in a bowl shape that protrudes from the winding portion 3 a and then extends substantially parallel to the rotating shaft 3 b. It is inserted through the uppermost ring portion 2c of the member 2 and rotatably supports the uppermost net piece.

On the other hand, the fixed frame 4 is a vertical member that extends to the left and right sides of the dust-proof net 1, and is disposed on the left and right sides along the short side (left and right end sides) of the net member 2, so It is fixed to the surface (airframe). In addition, the fixed frame 4 is erected so as to have a space slightly wider than the width of the cooling package 17. Each of the left and right fixed frames 4 is provided with support holes 4 a as shown in FIG. 1. . The support hole 4a is inserted into the rotary shaft 3b so as to rotatably support the entire take-up shaft member 3.

As shown in FIG. 4, the net member 2 is attached so as to span between the pair of fixed frames 2 in a state where the net member 2 is suspended by the winding unit 3, but the short side of each net piece is long. The length is set so that the upper net piece is shorter and the lower net piece is longer. For example, here, 15 net pieces are illustrated, and if the length of the short side of each net piece is w ₁ , w ₂ ,..., W _{15 in} order from the top, the magnitude relationship is w ₁ ≦ w _2. ≦ ... ≦ w ₁₅ is satisfied.

  As shown in FIG. 1, a handle 5 for rotating the rotary shaft 3b itself is fixed to the end of the rotary shaft 3b. As a result, when the handle 5 is rotated in the direction of arrow A in FIG. 1, the entire winding shaft member 3 rotates about the rotation shaft 3b. And the suspension part 3c which supports the net member 2 also rotates centering on the rotating shaft 3b, and the net member 2 is wound up by the outer peripheral surface of the winding part 3a. At this time, the cross-sectional shape of the wound net member 2 becomes a substantially triangular shape following the outer peripheral shape of the wound portion 3a, as shown in FIG.

  As shown in FIGS. 4 and 5, a fixing portion 2 d in which a screw hole 2 e for fixing the net member 2 to the fixing frame 4 is drilled is fixed to the lowermost net piece, On the other hand, the fixing frame 4 is also perforated with screw holes 4b. These screw holes 2e and 4b are formed at positions where they are overlapped with each other when the net member 2 is completely closed and fully released. As shown in FIG. 4, a fixing screw 6 that is screwed into the screw holes 2e and 4b is used. Thus, the net member 2 can be fixed to the fixed frame 4.

[Action / Effect]
With the configuration as described above, the dustproof net of the heat exchanger in the present embodiment has the following operations and effects.
(Normal time)
Normally, as shown in FIG. 4, the fixing screw 6 is fastened at the fixing portion 2 d fixed to the lowermost net piece of the net member 2 suspended from the take-up shaft member 3, and the net member 2 is It is fixed to the fixed frame 4. At this time, as shown in FIG. 2, the net pieces are juxtaposed without gaps with their long sides adjacent to each other vertically, so that the entire front surface of the cooling package 17 is covered without gaps.

At this time, the fixing frames 4 on both the left and right sides of the net member 2 are erected so as to have a gap slightly wider than the width of the cooling package 17, so that the entire surface of the cooling package 17 into which cooling air is to flow It will be blocked by the member 2. Therefore, the net member 2 can effectively remove dust and dust contained in the cooling air.
Further, since the mesh of the net surface 2a of the net member 2 is set to be fine enough to allow the cooling air to pass through without substantial resistance, the cooling performance of the cooling package 17 can be ensured. Since the net member 2 and the fixed frame 4 are fixed to each other by the fixing screw 6, it is possible to suppress rattling and vibration of the entire dustproof net 1.

(During cleaning work)
On the other hand, when the cooling package 17 is cleaned, the fastening of the fixing screw 6 is loosened, and the fixing of the net member 2 and the fixing frame 4 is released. Here, when the handle 5 is rotated in the direction of arrow A shown in FIG. 1, the entire winding unit 3 rotates about the rotation shaft 3b. Since the net member 2 is composed of a plurality of net pieces formed in a horizontally long strip shape, the net member 2 is freely bent at the position of the connecting member 2b. Thereby, the whole net | network member 2 is wound up by the outer peripheral surface of the winding-up part 3a sequentially from upper direction.

  When the entire net member 4 is wound upward, the front surface of the cooling package 17 is largely opened as shown in FIG. Therefore, the cooling package 17 can be accessed from the opened portion, and the core can be easily cleaned and maintained. For example, even if each net piece is made of a material that is difficult to bend (low flexibility), the net member 2 is freely bent at the position where the connecting member 2b is disposed, so that winding is easy.

Further, the net member 2 and the fixing frame 4 can be fixed by the fixing screw 6 in a state where the net member 2 is wound upward in this way, and the front surface of the cooling package 17 can be left open. .
As shown in FIG. 3, the winding diameter gradually increases by the thickness of the wound net member 2 as the winding amount of the net member 2 around the winding shaft member 3 increases. For example, when the planar net piece is wound into a substantially triangular shape as in the present embodiment, the length of each side constituting the triangle gradually increases.

  On the other hand, in this embodiment, since the length of the short side of each net piece of the net member 2 is set so as to increase sequentially from above, the winding diameter of the net piece can be reduced. That is, the winding length (short side length) is set longer for the net piece (the lower net piece) positioned on the outer side when wound on the winding shaft member 3, thereby Winding suitable for the shape of the shaft member 3 can be performed, and the net member 2 can be wound without a gap as shown in FIG.

Since the net member 2 is wound into a polygonal shape as described above, even when a net piece having a predetermined rigidity (somewhat hard) is used, the entire net member 2 is wound. Easy to take. In particular, in this embodiment, since it is wound up to the simplest triangular shape among polygonal shapes, the shape of the winding shaft member 3 can also be simplified.
Further, after the cleaning operation of the cooling package 17 is completed, the fixing screw 6 is removed and the handle is rotated in the direction opposite to the arrow A direction in FIG. it can. At this time, each net piece hangs substantially vertically from the suspended portion 3c of the winding shaft member 3 due to its own weight, so that it is easy to return to the normal state.

  As described above, according to the dust-proof net 1, it is possible to secure a space accessible to the cooling package 17 by simply rotating the handle 5 without removing the net member 2 from the fixed frame 4, and cleaning is easy. There is an advantage that maintenance can be performed. Moreover, since the net member 2 removed from the front surface of the cooling package 17 is compactly wound around the upper part of the opening to be opened, the space can be effectively used.

  Further, since the net member 2 is rotated between the left and right fixed frames 4, the cooling package 17 can be accessed even if there is no empty space around the fixed frame 4, and the inside of the engine room 14. Can save even more space. In addition, since it is not necessary to remove the net member 2 from the fixed frame 4, the cooling package 17 can be cleaned and inspected at any time regardless of the location. Thereby, even if there is no space around the excavator 10, maintenance can be performed.

[Others]
Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the cross-sectional shape of the winding portion 3a of the winding shaft member 3 is formed in a V shape, and the net member 2 is wound in a substantially triangular shape as shown in FIG. However, the winding shaft member 3 may be formed so that the net member 2 is wound into a polygonal shape or a circular shape. For example, the winding shape may be set according to the material and shape of the net member 2, and the shape of the winding portion 3a may be determined according to the winding shape.

  In the above-described embodiment, the net pieces are connected to each other by the connecting member 2b, and the net piece and the take-up shaft member 3 are connected to each other by the hanging portion 3c. However, it is not limited to this. For example, any known connecting means that can rotatably connect one to the other, such as a pin shaft using a hinge or a bearing, can be applied.

It is also conceivable that a plurality of net pieces can be bent without using the connecting member 2b. For example, in a resin-made net member, if a highly flexible portion and a low portion are alternately provided in the vertical direction, the highly flexible portion can function as a substitute for the connecting member 2b.
In the above-described embodiment, the take-up shaft member 3 is manually rotated using the handle 5, but an electric motor or other drive device may be provided.

  In the above-described embodiment, the entire take-up shaft member 3 rotates around the rotation shaft 3 b, but the rotation shaft 3 b does not necessarily have to be the rotation center of the take-up shaft member 3. In other words, the rotation shaft 3b only needs to rotate about an arbitrary axis parallel to the extending direction of the winding shaft member 3.

It is a perspective view of the dustproof net of the heat exchanger as one embodiment of the present invention. It is sectional drawing at the time of closing of this dustproof net (BB sectional drawing of FIG. 4). It is sectional drawing at the time of opening of this dustproof net (CC sectional drawing of FIG. 5). It is a front view (D direction arrow view of FIG. 6) of this dustproof net. It is a front view of this dustproof net at the time of cleaning of a heat exchanger. It is a perspective view of the working machine to which this dustproof net was applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dust-proof net 2 Net member 2a Net surface 2b Connection member 2c Ring part 2d Fixing part 2e Screw hole 3 Winding shaft member (shaft member)
3a Winding part 3b Rotating shaft 3c Suspension part 4 Fixed frame (fixing member)
4a Support hole 4b Screw hole 5 Handle 6 Fixing screw 10 Hydraulic excavator (work machine)
DESCRIPTION OF SYMBOLS 11 Lower traveling body 12 Upper revolving body 13 Working apparatus 14 Engine room 15 Engine 16 Cooling fan 17 Cooling package (heat exchanger)

Claims (5)

A dust-proof net interposed on the flow path of the cooling air guided to the heat exchanger of the work machine,
A net member formed of a plurality of net pieces which are formed in a horizontally long strip shape and are juxtaposed in the vertical direction on the front surface of the heat exchanger and connected to each other in a flexible manner;
A shaft member extending horizontally along the upper end of the net member, and supporting the upper end of the net member to suspend the net member;
A dust-proof net for a heat exchanger, comprising: a fixing member fixed to the machine body of the work machine and rotatably supporting the shaft member about an arbitrary axis parallel to the extending direction thereof. The dust net for a heat exchanger according to claim 1, wherein the net member has a connecting member for rotatably connecting the plurality of net pieces to each other. The dust net for a heat exchanger according to claim 1 or 2, wherein the shaft member has an outer shape that forms a polygonal column shape with the net piece closest to the shaft member among the plurality of net pieces. The heat exchanger according to any one of claims 1 to 3, wherein the plurality of net pieces are formed such that a net piece located below the net member has a longer short side. Dustproof net. The dust-proof net for a heat exchanger according to any one of claims 1 to 4, further comprising a fixing member for fixing the net member and the fixing member.

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