JP6912420B2 - Construction machinery - Google Patents

Description

The present invention relates to, for example, a construction machine such as a hydraulic excavator provided with a dustproof filter that captures dust and the like contained in cooling air.

In general, a hydraulic excavator as a typical example of a construction machine is composed of a self-propelled vehicle body composed of a lower traveling body and an upper rotating body, and a working device provided on the front side of the upper rotating body so as to be able to move up and down. There is.

The upper swivel body is mounted on the swivel frame forming a support structure, a counter weight provided on the rear side of the swivel frame to balance the weight with the working device, and a counter weight located on the front side of the counter weight. A prime mover such as an engine, an exterior cover provided on a swivel frame that covers the on-board equipment including the prime mover, a cooling fan that supplies cooling air into the exterior cover, and a heat exchange device that cools the fluid by the cooling air. It has.

The heat exchanger includes a radiator that cools the engine cooling water, an oil cooler that cools the return oil from the hydraulic actuator, an intercooler that cools the intake air supplied to the engine by the turbo supercharger, and a condenser that cools the refrigerant of the air conditioner. It is configured to include. Heat exchange is performed by dissipating the heat generated from this heat exchange device into the cooling air supplied into the outer cover by the cooling fan.

By the way, the hydraulic excavator often performs work in an environment with a lot of dust (dust) such as collecting wood chips and coal in the hold of a transport ship, or dismantling and disposing of metal scrap. When a large amount of dust is mixed in the cooling air (outside air) supplied to the exterior cover by the cooling fan, the heat exchange device is easily clogged with dust and the cooling performance of the heat exchange device. There is a problem that it causes a decrease in heat and a failure of the heat exchange device.

Therefore, a dustproof filter that captures dust and the like mixed in the cooling air is detachably provided on the upstream side of the heat exchange device with respect to the flow direction of the cooling air. In this case, the dust filter needs to be cleaned regularly in order to remove the adhering dust, and it is desirable that the dust filter can be easily attached to and detached from the upper swivel body.

On the other hand, a filter mounting structure has been proposed in which an elastic body is provided in a dustproof filter attached to and detached from the filter mounting portion of the upper swing body so that the elastic body is deformed when the filter is mounted on the filter mounting portion. .. In this conventional filter mounting structure, the pressing force that presses the filter against the filter contact surface of the filter mounting portion and the fixing that positions and fixes the filter with respect to the filter mounting portion by the component force of the elastic force of the deformed elastic body. You can get power. This makes it possible to improve workability when attaching and detaching the filter (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2008-208551

By the way, the cleaning work of the dustproof filter is usually performed during the suspension time when the operation of the hydraulic excavator is stopped, but the cleaning work of the dustproof filter is often performed at the work site in order to shorten the suspension time. In this way, when the dust filter is removed from the hydraulic excavator that has been suspended at the work site and the dust filter is cleaned near the hydraulic excavator, the dust particles that have come off the dust filter during the cleaning work are particles. Small-diameter dust becomes floating dust and falling soot and floats around the hydraulic excavator.

Therefore, a part of the dust (dust) floating around the hydraulic excavator may infiltrate into the heat radiating portion of the heat exchange device in the state where the dust filter is removed. In this way, if a part of the dust enters the heat exchange device during the cleaning work for the dust filter, cleaning for the heat exchange device is added separately from the cleaning for the dust filter, and the dust filter is cleaned. There is a problem that the workability of the work is lowered.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a construction machine capable of suppressing dust from entering the heat exchange device during cleaning of a dustproof filter. There is.

The present invention comprises a self-propelled vehicle body and a work device provided on the vehicle body, and the vehicle body includes the vehicle body frame and the work device provided on the front side and the rear side in the rear direction of the vehicle body frame. A counter weight for weight balancing, a prime mover mounted on the vehicle body frame in a horizontal position extending in the left and right directions located on the front side of the counter weight and orthogonal to the front and rear directions, and left and right of the prime mover. A heat exchange device located on one side of the direction and mounted on the vehicle body frame to cool the fluid by cooling air, a cooling fan for supplying cooling air to the heat exchange device, and the cooling air flow direction. A dust filter provided on the upstream side of the heat exchange device to capture dust mixed in the cooling air, and a vent provided on the vehicle body frame to cover the prime mover and the heat exchange device to take in outside air were formed. Applies to construction machinery with an exterior cover.

The feature of the present invention is that when the dust filter is removed, dust in the air replaces the dust filter on the upstream side of the heat exchange device with respect to the flow direction of the cooling air. It is provided with a shielding member that blocks entry into the exchange device.

According to the present invention, when the dust filter is removed, the dust floating in the air is removed from the heat exchange device by providing a shielding member on the upstream side of the heat exchange device with respect to the flow direction of the cooling air. It is possible to suppress the invasion of. Therefore, the cooling performance of the heat exchange device can be maintained satisfactorily, and the workability of the cleaning work for the dust filter can be improved.

It is a front view which shows the hydraulic excavator which concerns on 1st Embodiment of this invention. It is sectional drawing which looked at the inside of the exterior cover of the upper swing body from the direction of arrow II-II in FIG. It is an exploded perspective view which shows the heat exchange apparatus, the dustproof filter and the like. It is an exploded perspective view which shows the heat exchange apparatus, the shielding plate and the like. It is a front view which shows the hydraulic excavator by the 2nd Embodiment. It is a perspective view which shows the dustproof device by 2nd Embodiment. It is an exploded perspective view which shows the heat exchange device, the dustproof filter, etc. with the left side cover open. FIG. 5 is an exploded perspective view similar to FIG. 7, showing a state in which a shielding member is attached instead of the dustproof filter of the dustproof device. It is a front view which shows the left side cover, the vent, the shielding member and the like of the hydraulic excavator by the 3rd Embodiment in the state which the shielding plate is in an open position. FIG. 5 is a cross-sectional view of the left side cover, a guide member, a shielding plate, and the like as viewed from the direction of arrow XX in FIG. It is the same front view as FIG. 9 which shows the state in which the shielding plate is in a closed position. It is a front view which shows the left side cover, the vent, the shielding member and the like of the hydraulic excavator by 4th Embodiment in the state which the shielding member is a closed position. It is a perspective view which shows the shielding member alone.

Hereinafter, a hydraulic excavator will be taken as an example as a typical example of the construction machine according to the present invention, and will be described in detail with reference to FIGS. 1 to 13.

1 to 4 show a first embodiment of the present invention. In the figure, the vehicle body of the hydraulic excavator 1 is composed of a self-propelled crawler type lower traveling body 2 and an upper rotating body 3 mounted on the lower traveling body 2 so as to be swivelable. The upper swivel body 3 includes a swivel frame 5, a counterweight 6, an engine 7, a support frame 9, a heat exchange device 10, a dust filter 12, a cab 14, an exterior cover 15, and the like, which will be described later. A work device 4 is rotatably provided on the front side of the upper swivel body 3, and the work device 4 can be used to perform earth and sand excavation work and the like.

The working device 4 includes a boom 4A rotatably attached to the front side of the swivel frame 5 in the upward and downward directions, an arm 4B rotatably attached to the tip of the boom 4A in the upward and downward directions, and an arm 4B. A bucket 4C that is rotatably attached to the tip of the bucket 4A in the upward and downward directions, a boom cylinder 4D that drives the boom 4A, an arm cylinder 4E that drives the arm 4B, and a bucket cylinder 4F that drives the bucket 4C. Has been done.

The swivel frame 5 as the vehicle body frame is the base of the upper swivel body 3. As shown in FIG. 2, the swivel frame 5 is erected on a bottom plate 5A made of a thick steel plate extending in the front and rear directions and a bottom plate 5A, and is predetermined in the left and right directions orthogonal to the front and rear directions. It is provided with a left vertical plate 5B and a right vertical plate 5C extending in the front and rear directions at intervals of. The foot portion of the boom 4A is rotatably attached to the front side of the left and right vertical plates 5B and 5C.

Further, the swivel frame 5 includes a plurality of left-extending beams 5D extending to the left from the bottom plate 5A and the left vertical plate 5B (only one is shown), and a plurality (1) extending to the right from the bottom plate 5A and the right vertical plate 5C. It is equipped with a right overhang beam 5E (shown only in the book). The tip of each left overhang beam 5D is provided with a left side frame 5F extending in the front and rear directions along the left vertical plate 5B, and the tip of each right overhang beam 5E is provided with a front along the right vertical plate 5C. A right side frame 5G extending in the rear direction is provided. A support substrate 5H extending in the front and rear directions is provided between the two left overhang beams 5D located on the rear side of the swivel frame 5, and a support frame body 9 described later is mounted on the support substrate 5H. ing. Further, a plurality of undercovers 5J are provided between the left vertical plate 5B and the left side frame 5F, and between the right vertical plate 5C and the right side frame 5G, respectively.

The counterweight 6 is provided at the rear of the left vertical plate 5B and the right vertical plate 5C constituting the swivel frame 5. The counterweight 6 is formed as a heavy object that balances the weight with the working device 4 attached to the front side of the swivel frame 5.

The engine 7 as a prime mover is located on the front side of the counterweight 6 and mounted on the turning frame 5. The engine 7 is mounted on the rear side of the left and right vertical plates 5B and 5C constituting the swivel frame 5 in a horizontally installed state in which the crankshaft (not shown) extends in the left and right directions. As the prime mover, an electric motor or a hybrid type prime mover in which an engine and an electric motor are combined can be used. A cooling fan 11, which will be described later, is provided on the left side of the engine 7, and a hydraulic pump 8 is provided on the right side of the engine 7. The hydraulic pump 8 pressurizes the hydraulic oil by being driven by the engine 7, and this pressure oil is applied to the cylinders 4D, 4E, 4F of the work device 4, the traveling hydraulic motor, the swing hydraulic motor (none of which are shown), and the like. It discharges toward the hydraulic actuator of.

The support frame 9 as a heat exchanger support member is located on the left side of the engine 7 and is mounted on the support substrate 5H of the swivel frame 5. The support frame 9 supports the heat exchange device 10 described later on the swivel frame 5. The support frame 9 is formed by a front plate 9A and a rear plate 9B that rise upward from the support substrate 5H and face each other at intervals in the front and rear directions, and a top plate 9C that connects the upper ends of the front plate 9A and the rear plate 9B. It is formed in a frame shape, and a heat exchange device 10 is supported inside the support frame body 9.

The filter mounting member 9D is provided at the left end portion of the support frame body 9 (the end portion opposite to the engine 7 in the left and right directions), and the dustproof filter 12 described later is detachably attached. The filter mounting member 9D is composed of an upper bracket 9D1 and a lower bracket 9D2 provided at the left end portion of the support frame 9 at intervals in the upward and downward directions. Here, when the flow of the cooling air introduced into the exterior cover 15 by the cooling fan 11 is indicated by an arrow A in FIG. 2, the filter mounting member 9D is connected to the heat exchange device 10 with respect to the flow direction of the cooling air. Is also located on the upstream side. Then, a cooling air inlet 9E is formed between the upper bracket 9D1 and the lower bracket 9D2, and the cooling air introduced into the exterior cover 15 flows into the support frame 9 through the cooling air inlet 9E.

The upper bracket 9D1 constituting the filter mounting member 9D is formed with a plurality of female screw holes 9F (only two are shown) separated in the front and rear directions. A filter holder 9G is provided at the center in the front and rear directions of the lower bracket 9D2 constituting the filter mounting member 9D. The filter holder 9G holds the lower end of each dustproof filter 12 described later.

The heat exchange device 10 is located on the left side of the engine 7 and is mounted on the swivel frame 5. That is, the heat exchange device 10 is supported by the support frame 9 in a state of facing the cooling fan 11 in the left and right directions. The heat exchange device 10 includes a radiator that cools the engine cooling water, an oil cooler that cools the return oil from the hydraulic actuator, an intercooler that cools the intake air supplied to the engine by the turbo supercharger, and an air conditioner that cools the refrigerant of the air conditioner. It is configured to include a cooling capacitor and the like. Then, the heat exchange device 10 dissipates heat generated from the radiator, the oil cooler, the intercooler, the condenser for the air conditioner, etc. into the cooling air introduced in the exterior cover 15, thereby causing the engine cooling water, the hydraulic oil, and the turbo. Cools fluids such as intake air and air conditioner refrigerant that have passed through the supercharger.

The cooling fan 11 is provided between the engine 7 and the heat exchange device 10. The cooling fan 11 is rotationally driven by the engine 7 as a power source, and as shown by an arrow A in FIG. 2, the outside air is introduced into the exterior cover 15 (machine room 16) via each dust filter 12 described later. It is sucked in and this outside air is supplied to the heat exchange device 10 as cooling air. The cooling fan is not limited to the one that uses the engine 7 as a drive source, and the cooling fan may be configured by, for example, an electric fan or the like.

The two dustproof filters 12 are attached to the filter mounting member 9D of the support frame body 9, and when the flow direction of the cooling air indicated by the arrow A in FIG. 2 is used as a reference, the two dustproof filters 12 are relative to the flow direction of the cooling air. It is provided on the upstream side of the heat exchange device 10. Each dust filter 12 faces the cooling fan 11 with the heat exchange device 10 interposed therebetween in a state of being adjacent to each other in the front and rear directions orthogonal to the flow direction of the cooling air. Each dust filter 12 is composed of a rectangular frame portion 12A extending upward and downward, and a mesh-like net portion 12B mounted in the frame portion 12A. On the upper side of the frame portion 12A, a plurality of (two) bolt insertion holes 12C corresponding to the respective female screw holes 9F provided in the upper bracket 9D1 of the filter mounting member 9D are provided.

Then, each dustproof filter 12 covers the cooling air inflow port 9E of the support frame body 9 by holding the lower end of the frame portion 12A by the filter holder 9G provided on the filter mounting member 9D (lower bracket 9D2). Be independent in a state of being. In this state, the wing bolt 13 is inserted into each bolt insertion hole 12C of the frame portion 12A, and the wing bolt 13 is screwed into the female screw hole 9F provided in the upper bracket 9D1 of the filter mounting member 9D. As a result, each dustproof filter 12 is detachably attached to the filter attachment member 9D of the support frame 9 while covering the cooling air inlet 9E.

When the cooling air from the cooling fan 11 flows into the support frame 9 through the cooling air inlet 9E, the dust mixed in the cooling air is captured by each dustproof filter 12. In this case, if a large amount of dust is captured by each dustproof filter 12, the amount of cooling air passing through each dustproof filter 12 becomes insufficient, and the cooling performance of the heat exchange device 10 deteriorates. Therefore, each dust filter 12 needs to remove dust by regular cleaning work.

The cab 14 is provided on the left front side of the swivel frame 5. The cab 14 defines the driver's cab on which the operator is boarding. Inside the cab 14, for example, a driver's seat in which an operator sits, an operation lever for traveling, an operation lever for work, and the like (none of which are shown) are arranged.

The exterior cover 15 is located between the counterweight 6 and the cab 14 and is provided on the swivel frame 5. The exterior cover 15 includes a left side cover 15A located on the left side of the swivel frame 5 and extending in the front and rear directions, a right side cover 15B located on the right side of the swivel frame 5 and extending in the front and rear directions, and a left side. A top cover 15C extending horizontally between the upper ends of the right side covers 15A and 15B is provided. The upper surface cover 15C is provided with an opening 15D located on the upper side of the engine 7, and the upper surface cover 15C is provided with an engine cover 15E for opening and closing the opening 15D. As a result, a machine room 16 covered with an exterior cover 15 is formed on the swivel frame 5, and on-board equipment such as an engine 7, a hydraulic pump 8, and a heat exchange device 10 are housed in the machine room 16. ..

Here, the front end side of the left side cover 15A is supported by a support member provided on the swivel frame 5 via a hinge mechanism (neither is shown). As a result, the left side cover 15A is opened and closed between the open position where the machine room 16 is opened and the closed position where the machine room 16 is closed, centering on the hinge mechanism. Further, the left side cover 15A and the like are provided with an upper vent 15F and a lower vent 15G for taking in the cooling air into the machine room 16, and the right side cover 15B and the like are provided with the cooling air to be discharged to the outside. The exhaust port 15H is formed.

Next, the shielding plate 17 used in the first embodiment will be described with reference to FIG.

The two shielding plates 17 are detachably attached to the filter attaching member 9D of the support frame 9 instead of the dustproof filters 12. These two shielding plates 17 are attached to the filter mounting member 9D in exchange for each dustproof filter 12 when the dustproof filter 12 is removed from the support frame body 9 for cleaning work. Each shielding plate 17 is formed as a single rectangular plate having the same shape as the outer shape of the dustproof filter 12 by using, for example, a metal plate or the like. On the upper end side of each shielding plate 17, two bolt insertion holes 17A corresponding to the female screw holes 9F of the filter mounting member 9D (upper bracket 9D1) are provided at the same positions as the bolt insertion holes 12C of the dustproof filter 12. Has been

When each dustproof filter 12 is removed from the filter mounting member 9D of the support frame body 9, the lower end of each of these shielding plates 17 is held by the filter holder 9G of the filter mounting member 9D, so that the support frame is supported. It stands on its own while covering the cooling air inlet 9E of the body 9. In this state, the wing bolt 13 is inserted into each bolt insertion hole 17A of each shielding plate 17, and the wing bolt 13 is screwed into the female screw hole 9F of the upper bracket 9D1. It is fixed to the support frame 9 in a state where the 9E is covered (closed). It should be noted that the shielding plate 17 does not necessarily have to use a metal plate, has a hardness that allows it to stand on its own while being held by the filter holder 9G, and is a material that does not allow fine dust (dust) to pass through, such as plastic material and wood. , Urethane material or the like may be used to form a shielding plate.

When each dustproof filter 12 is removed from the filter mounting member 9D of the support frame body 9 for cleaning work, two shielding plates 17 are attached to the filter mounting member 9D in place of each of the removed dustproof filters 12. Therefore, for example, by cleaning the dust filter 12 near the hydraulic excavator 1 when the hydraulic excavator 1 is stopped, even if the dust (dust) separated from the dust filter 12 floats around the hydraulic excavator 1. Each shielding plate 17 can block the dust from entering the heat exchange device 10 through the cooling air inlet 9E of the support frame body 9. When each dustproof filter 12 is attached to the filter attachment member 9D of the support frame body 9, each shielding plate 17 is provided between, for example, the left vertical plate 5B and the left side frame 5F of the swivel frame 5. It is configured to be fixed on the undercover 5J using a holder or the like (not shown).

The hydraulic excavator 1 according to the first embodiment has the above-described configuration, and the operation of the hydraulic excavator 1 will be described below.

First, the operator gets on the cab 14 and operates the engine 7. By operating the traveling operation lever in this state, the lower traveling body 2 can be driven to move the hydraulic excavator 1 to the work site. Further, by operating the operation lever for work, the operator can move the work device 4 up and down while turning the upper swivel body 3 to perform excavation work of earth and sand.

When the engine 7 is operated, the cooling fan 11 rotates, and the heat exchange device 10 and the cooling fan 11 tend to have a negative pressure in the exterior cover 15. As a result, as shown by arrow A in FIG. 2, outside air is introduced into the exterior cover 15 (machine room 16) through the vents 15F and 15G above and below the exterior cover 15. This outside air becomes cooling air, flows into the cooling air inlet 9E of the support frame body 9, and is supplied to the heat exchange device 10 supported by the support frame body 9. The heat exchange device 10 cools fluids such as engine cooling water, hydraulic oil, intake air that has passed through a turbocharger, and refrigerant for an air conditioner by exchanging heat with the supplied cooling air.

Here, two dustproof filters 12 are attached to the filter attachment member 9D of the support frame 9 arranged on the upstream side of the heat exchange device 10 with respect to the flow direction of the cooling air. As a result, the dust mixed in the cooling air is captured by each dustproof filter 12 before flowing into the cooling air inflow port 9E of the support frame body 9. Therefore, it is possible to supply clean cooling air that does not contain dust to the heat exchange device 10. As a result, it is possible to prevent dust from adhering to the heat exchange device 10 and clogging it, and it is possible to maintain good cooling performance by the heat exchange device 10 for a long period of time.

Here, since the hydraulic excavator 1 repeats the operation for a long period of time, a large amount of dust is captured by each dustproof filter 12, so that the amount of cooling air passing through each dustproof filter 12 decreases and heat exchange occurs. This causes a decrease in the cooling performance of the device 10. Therefore, it is necessary to periodically remove dust (cleaning work) from the dust filter 12.

When cleaning the dust filter 12, the left side cover 15A of the exterior cover 15 is opened to access the inside of the machine room 16 with the engine 7 stopped and the hydraulic excavator 1 stopped. Then, with the wing bolt 13 removed from the female screw hole 9F of the filter mounting member 9D (upper bracket 9D1) of the support frame body 9, each dustproof filter 12 is pulled upward and separated from the filter holder 9G. As a result, the dustproof filter 12 can be removed from the filter mounting member 9D of the support frame body 9, and dust adhering to the dustproof filter 12 can be removed outside the machine room 16.

Here, when the cleaning work for the dustproof filter 12 is performed near the closed hydraulic excavator 1, the fine dust removed from the dustproof filter 12 becomes dust and surrounds the hydraulic excavator 1. , And a part of the dust may enter the heat exchange device 10 through the cooling air inlet 9E of the support frame 9 from which the dust filter 12 has been removed.

On the other hand, in the first embodiment, when cleaning the two dustproof filters 12 removed from the support frame 9, the filter mounting member of the support frame 9 is replaced with the removed dustproof filters 12. Two shielding plates 17 can be attached to 9D. That is, with the lower end of each shielding plate 17 held by the filter holder 9G of the filter mounting member 9D, the wing bolt 13 is inserted into each bolt insertion hole 17A provided in each shielding plate 17, and the wing bolt 13 is inserted. Is screwed into the female screw hole 9F of the upper bracket 9D1. As a result, each of the shielding plates 17 can be attached to the support frame 9 while covering the cooling air inlet 9E.

Therefore, even if dust (dust) floats around the hydraulic excavator 1 due to the cleaning work on the dust filter 12, the dust does not enter the heat exchange device 10 through the cooling air inlet 9E of the support frame 9. It can be shielded by two shielding plates 17. As a result, it is possible to suppress the dust separated from the dust filter 12 from adhering to the heat exchange device 10, and to maintain good cooling performance by the heat exchange device 10. Further, since the work of cleaning the dust adhering to the heat exchange device 10 is not added, the workability when cleaning the dustproof filter 12 can be improved.

Moreover, the shielding plate 17 is formed as a rectangular plate having the same shape as the outer shape of the dustproof filter 12, and two bolt insertion holes 17A are formed at the same positions as the bolt insertion holes 12C of the dustproof filter 12. Has been done. Therefore, each shielding plate 17 can be attached to the support frame 9 by using a mechanism for attaching each dust filter 12 to the filter attachment member 9D of the support frame 9. As a result, it is not necessary to prepare a dedicated member for attaching each shielding plate 17 to the support frame body 9, and the cost for adding the shielding plate 17 can be suppressed.

Thus, the upper swing body 3 of the hydraulic excavator 1 according to the first embodiment has a counter weight 6 and a counter weight 6 for balancing the weight of the swivel frame 5 and the working device 4 provided on the rear side of the swivel frame 5. The engine 7 located on the front side of the swivel frame 5 and mounted on the swivel frame 5 on the left and right sides of the engine 7 and the heat exchange device 10 mounted on the swivel frame 5 to cool the fluid by cooling air. A cooling fan 11 that supplies cooling air to the heat exchange device 10, a dust filter 12 that is provided on the upstream side of the heat exchange device 10 with respect to the flow direction of the cooling air and that captures dust mixed in the cooling air, and an engine. It is provided on the swivel frame 5 so as to cover the heat exchange device 10 and the heat exchange device 10, and is provided with an exterior cover 15 on which outside air is taken in and the lower vents 15F and 15G are formed.

Then, when the dust filter 12 is removed on the upstream side of the heat exchange device 10 with respect to the flow direction of the cooling air (direction of arrow A in FIG. 2), the dust filter 12 is replaced with the air in the air. A shielding plate 17 is provided to prevent the dust from entering the heat exchange device 10. According to this configuration, when the dust filter 12 is removed and cleaned, the dust separated from the dust filter 12 is separated from the dust filter 12 by providing the shielding plate 17 on the upstream side of the heat exchange device 10 with respect to the flow direction of the cooling air. Even when the dust is suspended in the air, the shielding plate 17 can prevent the dust from entering the heat exchange device 10. Therefore, the cooling performance of the heat exchange device 10 can be maintained well, the work of cleaning the dust adhering to the heat exchange device 10 can be eliminated, and the workability of the dust filter 12 at the time of cleaning can be improved. Can be done.

Further, a filter mounting member 9D for mounting the dustproof filter 12 is provided located upstream of the heat exchange device 10 with respect to the flow direction of the cooling air, and the shielding plate 17 is detachably mounted on the filter mounting member 9D. Be done. As a result, the dustproof filter 12 to be cleaned is simply removed from the filter mounting member 9D, and the shielding plate 17 is attached to the filter mounting member 9D in place of the dustproof filter 12, and the intrusion of dust into the heat exchange device 10 is prevented from entering the shielding plate. It can be blocked by 17.

Next, FIGS. 5 to 8 show a second embodiment of the present invention, and a feature of the present embodiment is that a dustproof device including a dustproof filter is mounted between the heat exchange device and the exterior cover to prevent dust. When cleaning the filter, a shielding member is attached to the dustproof device instead of the dustproof filter. In the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, the vehicle body of the hydraulic excavator 21 is composed of a crawler type lower traveling body 2 and an upper rotating body 22 mounted on the lower traveling body 2 so as to be swivelable. The upper swivel body 22 includes a swivel frame 5, a counterweight 6, an engine (not shown), a heat exchange device 10, a cab 14, a support frame 23 described later, a dustproof device 24, an exterior cover 28, and the like. There is.

The support frame 23 is located between the counterweight 6 and the cab 14 and is provided on the swivel frame 5. The support frame 23 supports the heat exchange device 10 and constitutes a part of the exterior cover 28 described later. As shown in FIG. 7, the support frame body 23 is attached to the left side frame 5F or the like of the swivel frame 5, and rises upward while facing the rear surface of the cab 14, and the front plate 23A and the front. It is composed of a rear surface plate 23B that rises upward while facing each other at intervals in the rear direction, and a top plate 23C that connects the upper end of the front plate 23A and the upper end of the rear surface plate 23B and extends in the front and rear directions. There is. A heat exchange device 10 is attached to the inside of the support frame body 23.

The dustproof device 24 is provided between the heat exchange device 10 and the left side cover 28A of the exterior cover 28, which will be described later. That is, the dustproof device 24 is provided on the upstream side of the heat exchange device 10 with respect to the flow direction of the cooling air (direction of arrow A in FIG. 6). The dustproof device 24 captures dust mixed in the cooling air and supplies clean cooling air to the heat exchange device 10. The dustproof device 24 includes a filter mounting member 25, which will be described later, and each dustproof filter 27.

The filter mounting member 25 is mounted on the left end of the support frame 23, which is on the upstream side of the heat exchange device 10 with respect to the flow direction of the cooling air, by using a plurality of bolts 26. The filter mounting member 25 sandwiches and holds each dustproof filter 27 with the left side cover 28A, which will be described later. The filter mounting member 25 is formed in a quadrangular frame shape surrounding the cooling air inlet 25A, and an overhanging portion 25B overhanging the cooling air inlet 25A is provided on the inner peripheral side of the filter mounting member 25. The overhanging portion 25B holds each dustproof filter 27 in the cooling air inflow port 25A of the filter mounting member 25 by abutting the peripheral edge portion of each dustproof filter 27.

The two dustproof filters 27 are held in the cooling air inlet 25A of the filter mounting member 25 in a state of being adjacent to each other in the upward and downward directions. Each of these dustproof filters 27 captures dust in the cooling air passing through the cooling air inlet 25A. Each dustproof filter 27 is composed of a rectangular parallelepiped frame 27A extending in the front and rear directions, and a filter body 27B attached to the inside of the frame 27A. A handle 27C gripped by an operator is provided on the outer surface of the frame body 27A.

The exterior cover 28 is located between the counterweight 6 and the cab 14 and is provided on the swivel frame 5. The exterior cover 28 is arranged on the support frame 23, the left side cover 28A attached to the filter mounting member 25 and extending the left side of the swivel frame 5 in the front and rear directions, and the right side of the swivel frame 5 in the front and rear directions. Includes an extended right side cover (not shown) and an engine cover 28B extending left and right between the upper part of the support frame 23 and the upper part of the right side cover so as to cover the engine 7 and the like from above. It is composed of.

Here, the front end of the left side cover 28A constituting the exterior cover 28 is attached to the front portion of the filter mounting member 25 via two hinge members 29. As a result, the left side cover 28A rotates about the hinge member 29 between the closed position shown in FIG. 6 and the open position shown in FIG. 7. The left side cover 28A sandwiches and holds each dustproof filter 27 between the left side cover 28A and the overhanging portion 25B of the filter mounting member 25 in the closed position.

The left side cover 28A is formed in a quadrangular frame shape using a steel plate material or the like, and has an upper vent 28A1 formed of an aggregate of small holes formed in a region corresponding to the upper dustproof filter 27, and a lower dustproof port 28A1. It has a lower vent 28A2 made of an aggregate of small holes formed in a region corresponding to the filter 27. Two latch members 30 are provided on the rear end side of the left side cover 28A so as to be separated from each other at the top and bottom. Each of these latch members 30 holds the left side cover 28A in the closed position by engaging with a catch member (not shown) provided on the filter mounting member 25.

On the other hand, on the inner side surface of the left side cover 28A on the machine room 16 side, three filter retainers 28A3 are provided apart from each other in the upward and downward directions. Each of these filter pressers 28A3 is formed in a band shape using an elastic body such as urethane rubber, and when the left side cover 28A is in the closed position, the frame body 27A of each dustproof filter 27 is attached to the filter mounting member 25. Press against the overhanging portion 25B of. As a result, when the left side cover 28A is in the closed position, each dustproof filter 27 is held between the left side cover 28A and the filter mounting member 25 (overhanging portion 25B).

The two shielding members 31 are detachably attached to the filter attachment member 25 of the dustproof device 24 instead of each dustproof filter 27. These two shielding members 31 are attached to the filter mounting member 25 in exchange for each dustproof filter 27 when the dustproof filter 27 is removed from the filter mounting member 25 for cleaning work. Each shielding member 31 is formed as a hollow rectangular parallelepiped box having the same outer shape as the dustproof filter 27 by using a plate material made of a material such as metal, wood, plastic, or urethane. A handle 31A gripped by an operator is provided on the outer surface of each shielding member 31. The shielding member 31 is not limited to a hollow box body, and may be formed as a thick solid plate body.

When each dustproof filter 27 is removed from the filter mounting member 25 of the dustproof device 24, each of these shielding members 31 is arranged in the filter mounting member 25 instead of each dustproof filter 27, so that the cooling air flow inlet It stands on its own while covering 25A. In this state, by closing the left side cover 28A, each shielding member 31 is sandwiched and held between the left side cover 28A and the filter mounting member 25 (overhanging portion 25B), and dust is filtered. It blocks the heat exchange device 10 from entering through the cooling air inlet 25A of the mounting member 25.

The hydraulic excavator 21 according to the second embodiment has the above-described configuration, and when the dustproof filters 27 are removed from the dustproof device 24 for cleaning work, two dustproof filters 27 are replaced with the removed dustproof filters 27. The shielding member 31 is attached to the filter mounting member 25 of the dustproof device 24. Therefore, for example, by cleaning the dust filter 27 near the hydraulic excavator 21 when the hydraulic excavator 21 is closed, even if the dust separated from the dust filter 27 floats around the hydraulic excavator 21, the dust dust is the dust. Can be blocked by each shielding member 31 from entering the heat exchange device 10 through the cooling air inlet 25A of the filter mounting member 25.

Next, FIGS. 9 to 11 show a third embodiment of the present invention, which is characterized in that the exterior cover is provided with a guide member extending along the vent, and the shielding member is a guide member. Guided by, it is to move between the open position where the vent is opened and the shield position where the vent is shielded. In the third embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, the upper guide member 32 and the lower guide member 33 are respectively front on the outer surface of the left side cover 15A constituting the exterior cover 15 of the hydraulic excavator, which is opposite to the machine room (not shown). ， It is provided extending in the rear direction. The upper guide member 32 movably supports the upper shielding plate 34 described later in the front and rear directions, and the lower guide member 33 movably supports the lower shielding plate 35 described later in the front and rear directions. ..

The upper guide member 32 is formed by a pair of guide rails 32A extending in the front and rear directions with the upper vent 15F provided on the left side cover 15A sandwiched from the upper and lower directions. Each guide rail 32A is formed by bending a metal plate or the like into an L shape, and is fixed to the left side cover 15A at regular intervals in the upward and downward directions. The lower guide member 33 is formed by a pair of guide rails 33A extending in the front and rear directions with the lower vent 15G sandwiched from the upper and lower directions. Each guide rail 33A is also formed by bending a metal plate or the like into an L shape, and is fixed to the left side cover 15A at regular intervals in the upward and downward directions.

The upper shielding plate 34 as a shielding member is provided on the outer surface of the left side cover 15A via the upper guide member 32, and has an open position for opening the upper vent 15F as shown in FIG. 9 and an open position as shown in FIG. It is possible to move forward and backward between the upper vent 15F and the shielding position that shields (closes) the upper ventilation port 15F. Here, the upper shielding plate 34 is formed as a rectangular plate extending in the front and rear directions using a material having a self-supporting hardness such as metal, wood, plastic, and urethane, and is guided by each guide rail 32A. It moves (slides) forward and backward in the state of being in the state. On the rear end side of the upper shielding plate 34, a handle 34A that is gripped when the upper shielding plate 34 is moved between the open position and the shielding position is provided.

The lower shielding plate 35 as a shielding member is provided on the outer surface of the left side cover 15A via the lower guide member 33, and has an open position (position in FIG. 9) for opening the lower vent 15G and a lower vent 15G. It is possible to move forward and backward from the shielding position (position in FIG. 11) to be shielded (closed). Here, the lower shielding plate 35 is also formed as a rectangular plate extending in the front and rear directions like the upper shielding plate 34, and moves (slides) in the front and rear directions while being guided by each guide rail 33A. .. A handle 35A is provided on the rear end side of the lower shielding plate 35.

The hydraulic excavator according to the third embodiment has the upper shielding plate 34 and the lower shielding plate 35 as described above on the left side cover 15A of the exterior cover 15, and the hydraulic excavator is used to excavate earth and sand. Occasionally, as shown in FIG. 9, the upper shield plate 34 and the lower shield plate 35 are moved to the open positions, respectively. As a result, cooling air is supplied to the heat exchange device (not shown) in the exterior cover 15 through the upper vent 15F and the lower vent 15G. The dust mixed in the cooling air at this time is captured by a dust filter (not shown) provided on the upstream side of the heat exchange device.

On the other hand, when cleaning the dustproof filter, the left side cover 15A is opened with the hydraulic excavator suspended, and the dustproof filter (not shown) is taken out of the upper swivel body 3. Then, the left side cover 15A is closed, and the upper shielding plate 34 and the lower shielding plate 35 are moved to the shielding positions (positions in FIG. 11), respectively. As a result, the upper vent 15F can be shielded by the upper shielding plate 34, and the lower vent 15G can be shielded by the lower shielding plate 35.

Thus, according to the third embodiment, when the dust separated from the dustproof filter is suspended in the air by cleaning the dustproof filter (not shown) taken out to the outside of the upper swivel body 3. However, the upper shielding plate 34 and the lower shielding plate 35 can block the dust from flowing into the exterior cover 15 through the upper vent 15F and the lower vent 15G. As a result, the upper shielding plate 34 and the lower shielding plate 35 can prevent dust from entering the heat exchange device (not shown).

In this case, the upper shielding plate 34 and the lower shielding plate 35 can shield the upper vent 15F and the lower vent 15G of the left side cover 15A, which is the inlet of the cooling air into the exterior cover 15. Therefore, the dust separated from the dust filter (not shown) enters the exterior cover 15 (inside the machine room) not only around the heat exchange device (not shown) but also through the upper vent 15F and the lower vent 15G. It can be suppressed from invading. Therefore, the frequency of cleaning the inside of the exterior cover 15 can be reduced.

Moreover, the upper shielding plate 34 and the lower shielding plate 35 are held by the upper guide member 32 and the lower guide member 33 provided on the left side cover 15A. Therefore, when the upper vent 15F and the lower vent 15G are opened, it is not necessary to provide a space in the exterior cover 15 for accommodating the upper shield plate 34 and the lower shield plate 35. As a result, a large space for accommodating the equipment in the exterior cover 15 can be secured.

Next, FIGS. 12 and 13 show a fourth embodiment of the present invention, and the feature of the present embodiment is that the shielding member is a sheet material having flexibility capable of covering the ventilation holes of the exterior cover. , It is composed of a mounting member attached to the sheet material and attached to the exterior cover. In the fourth embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, the shielding member 36 is provided on the outer surface of the left side cover 15A constituting the exterior cover 15 of the hydraulic excavator, which is opposite to the machine room (not shown). The shielding member 36 is composed of a sheet material 37 described later and each mounting member 38, and has an open position for opening the upper vent 15F and the lower vent 15G of the left side cover 15A, and the upper vent 15F and the lower vent. It can be moved to and from the shielding position (position in FIG. 12) that shields 15G.

The sheet material 37 is formed in a quadrangular sheet shape having flexibility by using, for example, a cloth material or a vinyl material. The sheet material 37 has an area that can simultaneously cover the upper vent 15F and the lower vent 15G provided on the left side cover 15A. Then, when the sheet material 37 shields the upper vent 15F and the lower vent 15G of the left side cover 15A, the sheet material 37 is attached to the outer surface of the left side cover 15A as shown in FIG. 12, and the upper vent 15F and the lower vent 15F are attached. When the vent 15G is opened, it is removed from the outer surface of the left side cover 15A.

The two mounting members 38 are fixed to the upper end edge and the lower edge portion of the sheet material 37, respectively. Each mounting member 38 is formed by using, for example, a square columnar magnet having a length dimension similar to the length dimension in the front and rear directions of the sheet material 37, and is attracted to the left side cover 15A by magnetic force. be. Therefore, as shown in FIG. 12, the upper mounting member 38 is mounted on the upper end of the left side cover 15A or the left end of the top cover 15C, and the lower mounting member 38 is mounted on the lower end of the left side cover 15A. The upper vent 15F and the lower vent 15G provided on the left side cover 15A can be simultaneously shielded by the sheet material 37. On the other hand, when each mounting member 38 is removed from the left side cover 15A and the sheet material 37 is removed, the upper vent 15F and the lower vent 15G provided on the left side cover 15A can be opened.

In the hydraulic excavator according to the fourth embodiment, the left side cover 15A of the exterior cover 15 is provided with the shielding member 36 as described above. When excavating earth and sand using this hydraulic excavator, the left side cover The sheet material 37 is removed from 15A, and the upper vent 15F and the lower vent 15G are opened. As a result, cooling air is supplied to the heat exchange device (not shown) in the exterior cover 15 through the upper vent 15F and the lower vent 15G. The dust mixed in the cooling air at this time is captured by a dust filter (not shown) provided on the upstream side of the heat exchange device.

On the other hand, when cleaning the dustproof filter, the left side cover 15A is opened with the hydraulic excavator suspended, and the dustproof filter (not shown) is taken out of the upper swivel body 3. Then, with the left side cover 15A closed, as shown in FIG. 12, each mounting member 38 attached to the sheet material 37 is attached to the left side cover 15A. As a result, the upper vent 15F and the lower vent 15G of the left side cover 15A can be simultaneously shielded by the sheet material 37.

Thus, according to the fourth embodiment, when the dust separated from the dustproof filter is suspended in the air by cleaning the dustproof filter (not shown) taken out to the outside of the upper swivel body 3. However, the sheet material 37 of the shielding member 36 can block the dust from flowing into the exterior cover 15 through the upper vent 15F and the lower vent 15G. As a result, the shielding member 36 can prevent dust from entering the heat exchange device (not shown).

In this case, since the sheet material 37 of the shielding member 36 can shield the upper vent 15F and the lower vent 15G of the left side cover 15A, the dust separated from the dust filter (not shown) exchanges heat. It is possible to suppress the invasion into the exterior cover 15 (inside the machine room) not only around the device (not shown) but also through the upper vent 15F and the lower vent 15G. Therefore, the frequency of cleaning the inside of the exterior cover 15 can be reduced.

Moreover, since the sheet material 37 can simultaneously cover the upper vent 15F and the lower vent 15G provided on the left side cover 15A, for example, the upper vent 15F and the lower vent 15G are separately shielded from each other. Compared with the case of shielding using a member, the workability when shielding the upper vent 15F and the lower vent 15G can be improved.

Further, by forming the sheet material 37 using a flexible material such as a cloth material or a vinyl material, the sheet material 37 can be attached to the left side cover 15A regardless of the shape of the left side cover 15A. Therefore, it is not necessary to process the sheet material 37 so as to conform to the shape of the left side cover 15A. As a result, the cost of the shielding member 36 including the sheet material 37 can be reduced. Further, since the sheet material 37 removed from the left side cover 15A can be folded, for example, the storage space when the shielding member 36 is housed in the exterior cover 15 can be reduced, and the inside of the exterior cover 15 can be reduced by this amount. It is possible to secure a large space for accommodating other on-board equipment.

In the first embodiment, a configuration in which two dustproof filters 12 and two shielding plates 17 are attached to the filter mounting member 9D of the support frame 9 is illustrated. However, the present invention is not limited to this, and for example, one or three or more dustproof filters and shielding plates may be attached. This also applies to the dustproof filter 27 and the shielding member 31 according to the second embodiment.

Further, in the third embodiment, the case where the upper and lower guide members 32 and 33 and the upper and lower shielding plates 34 and 35 are provided on the outer surface of the left side cover 15A is illustrated. However, the present invention is not limited to this, and for example, the upper and lower guide members and the upper and lower shielding plates may be provided on the inner surface of the left side cover 15A on the machine room (not shown) side. good. This also applies to the shielding member 36 according to the fourth embodiment.

Further, in the embodiment, a crawler type hydraulic excavator is exemplified as a construction machine, but the present invention is not limited to this, and can be applied to other construction machines such as a wheel type hydraulic excavator and a wheel loader. ..

1,21 Hydraulic excavator (construction machinery)
2 Lower running body (body)
3,22 Upper swivel body (body)
4 Work equipment 5 Swivel frame (body frame)
6 Counterweight 7 Engine (motor)
9 Support frame (heat exchanger mounting member)
9D, 25 Filter mounting member 10 Heat exchanger 11 Cooling fan 12,27 Dustproof filter 15,28 Exterior cover 15F, 28A1 Upper vent 15G, 28A2 Lower vent 17 Shielding plate (shielding member)
24 Dustproof device 31, 36 Shielding member 32 Upper guide member (guide member)
33 Lower guide member (guide member)
34 Upper shielding plate (shielding member)
35 Lower shielding plate (shielding member)
37 Sheet material 38 Mounting member

Claims (7)

It consists of a self-propelled vehicle body and a work device provided on the vehicle body.
The vehicle body is located on the front side of the vehicle body frame, counter weights provided on the rear side in the front and rear directions of the vehicle body frame to balance the weight of the working device, and orthogonal to the front and rear directions. Heat exchange between the prime mover mounted on the vehicle body frame in a horizontal position extending in the left and right directions and the motor mounted on the vehicle body frame on one side of the prime mover in the left and right directions to cool the fluid with cooling air. An apparatus, a cooling fan that supplies cooling air to the heat exchange apparatus, and a dustproof filter that is provided on the upstream side of the heat exchange apparatus with respect to the flow direction of the cooling air and captures dust mixed in the cooling air. In a construction machine including the prime mover and an exterior cover provided on the vehicle body frame and formed with a vent for taking in outside air so as to cover the heat exchange device.
When the dust filter is removed, dust in the air enters the heat exchange device in place of the dust filter on the upstream side of the heat exchange device with respect to the flow direction of the cooling air. A construction machine characterized by having a shielding member that blocks the air. A filter mounting member for mounting the dustproof filter is provided located upstream of the heat exchange device with respect to the flow direction of the cooling air.
The construction machine according to claim 1, wherein the shielding member is configured to be detachable from the filter mounting member. A heat exchange device support member for supporting the heat exchange device is provided on the upstream side of the cooling fan with respect to the flow direction of the cooling air.
The construction machine according to claim 2, wherein the filter mounting member is provided on the heat exchange device support member. A dustproof device having the dustproof filter is provided between the heat exchange device and the exterior cover.
The construction machine according to claim 2, wherein the filter mounting member is provided in the dustproof device. The first aspect of the present invention, wherein the shielding member is provided on the exterior cover and is configured to be movable between an open position for opening the vent and a shielding position for shielding the vent. Construction machinery. The exterior cover is provided with a guide member extending along the vent.
The construction machine according to claim 5, wherein the shielding member is formed of a plate body that slides between the open position and the shielding position while being guided by the guide member. The fifth aspect of the present invention is characterized in that the shielding member is composed of a sheet material having flexibility capable of covering the vent and a mounting member fixed to the sheet material and attached to the exterior cover. Described construction machinery.

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