JP7058237B2 - Construction machinery - Google Patents

Description

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

In general, a hydraulic excavator representing a construction machine has a self-propelled lower traveling body and an upper turning body mounted so as to be able to turn on the lower traveling body, and the vehicle body is formed by the lower traveling body and the upper turning body. Is configured. A work device is provided on the front side of the upper swivel body, and excavation work of earth and sand is performed using this work device.

The upper swivel body includes a swivel frame as a base, a prime mover mounted on the swivel frame, a building cover provided on the swivel frame to cover the mounted equipment including the prime mover, and a cooling fan for supplying cooling air into the building cover. It is equipped with a heat exchange device located inside the building cover and provided on the swivel frame. The heat exchange device includes a radiator that cools the engine cooling water, an oil cooler that cools the return oil from the hydraulic actuator, and the like. Heat exchange is performed by dissipating the heat generated from this heat exchange device into the outside air supplied to the inside of the building cover by the cooling fan.

By the way, since hydraulic excavators often work in an environment with a lot of dust such as dust and dirt, a large amount of dust is contained in the cooling air (outside air) supplied into the building cover by the cooling fan. Is mixed. The dust in the cooling air adheres to the heat exchange device, which causes a problem that the cooling performance of the heat exchange device deteriorates and the heat exchange device fails. Therefore, a net holding member is provided on the upstream side of the heat exchange device with respect to the flow direction of the cooling air, and a dustproof net for catching dust mixed in the cooling air can be attached to and detached from the net holding member. It is installed. In this case, the dustproof net needs to be cleaned regularly in order to remove the adhering dust, and it is desirable that the dustproof net can be easily attached to and detached from the net holding member.

On the other hand, there has been proposed a dustproof net mounting structure in which an elastic body is provided on one of the net holding member and the dustproof net (filter) so that the elastic body is deformed when the dustproof net is attached to the net holding member. .. In this conventional technique, the restoring force (elastic force) of an elastically deformed elastic body acts on a pressing force that presses a dustproof net against the net contact plate of the net holding member and acts in a direction orthogonal to the pressing force to act on the net holding member. It is possible to obtain a fixing force for fixing the dustproof net, and the workability when attaching and detaching the dustproof net is improved (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2008-208551

However, in the dustproof net mounting structure according to Patent Document 1, the pressing force that presses the dustproof net held by the net holding member against the net contact plate of the net holding member and the fixing force that fixes the dustproof net to the net holding member are present. , It is always acting by the restoring force of the elastic body. In this case, the pressing force that presses the dustproof net against the net contact plate always acts in a direction that hinders the removal of the dustproof net from the net holding member. As a result, there is a problem that the workability when removing the dustproof net from the net holding member during the cleaning work is lowered.

On the other hand, when the elastic force (restoring force) of the elastic body is weakened in consideration of workability when removing the dustproof net, the fixing force for fixing the dustproof net to the net holding member is also weakened. Therefore, when a large vibration is generated during the running of the hydraulic excavator or the excavation work, the dustproof net with respect to the net holding member falls off, the position is displaced, and the like. As a result, the dust contained in the cooling air cannot be reliably captured by the dustproof net, which causes a problem that the cooling performance of the heat exchange device is deteriorated.

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 improving workability when a dustproof net is attached to and removed from a net holding member. To provide.

The present invention comprises a self-propelled main body and a working device provided on the front side of the main body, and the main body supplies a building cover that covers on-board equipment including a prime mover and cooling air into the building cover. The cooling fan, the heat exchange device provided in the building cover, the net holding member provided on the upstream side of the heat exchange device with respect to the flow direction of the cooling air, and the net holding member held by the net holding member. It is applied to construction machinery equipped with a dustproof net that captures dust mixed in the cooling air.

The feature of the present invention is that the net holding member faces the net abutting plate on which the opening through which the cooling air flows is formed and the dustproof net abuts with the net abutting plate, and the dustproof net is accommodated. It has a pair of side plates forming a net accommodating space, and the dust-proof net is accommodated in one side plate of the pair of side plates when the dust-proof net is held by the net holding member. A guide member for guiding the space and a spring member for pressing the dust-proof net housed in the net accommodating space toward the other side plate of the pair of side plates are provided, and the other side plate and the dust-proof net are provided. The net is provided with a net fixing member that presses the dustproof net against the net contact plate and fixes the dustproof net at a position covering the opening , and the dustproof net is a net frame body held by the net holding member. The net frame is provided with an engaging projection that engages with the guide member when the dustproof net is inserted into the net accommodating space. It is in the fact that it is.

According to the present invention, the dustproof net is guided to the net accommodating space by the guide member provided on one side plate of the net holding member, and is pressed against the other side plate of the net holding member by the spring member. In this case, the restoring force of the spring member does not act in the direction of pressing the dustproof net against the net contact plate, so that the workability when removing the dustproof net from the net holding member can be improved. On the other hand, the dustproof net accommodated in the net accommodating space can be fixed at a position covering the opening while being pressed against the net contact plate by the net fixing member.

It is a front view which shows the hydraulic excavator to which the embodiment of this invention is applied. It is a top view which shows the state which the cab, the engine, the heat exchange device, etc. are mounted on the swivel frame of a hydraulic excavator. It is a perspective view which shows the state which attached the dustproof net to the net holding member. It is a perspective view which shows the support frame body of a heat exchange apparatus, and the net holding member. It is a perspective view which shows the dustproof net alone. It is sectional drawing which looked at the dustproof net from the direction of arrow VI-VI in FIG. FIG. 3 is an enlarged perspective view showing a spring member in FIG. 3. FIG. 3 is an enlarged perspective view showing a handle and a net fixing member in FIG. 3. FIG. 3 is a cross-sectional view of a partially broken net holding member, dustproof net, guide member, spring member, net fixing member, handle, etc. as viewed from the direction of arrow IX-IX in FIG. FIG. 9 is a cross-sectional view of a partially broken surface as seen from the same position as in FIG. 9, showing a state in which the dustproof net is attached to and removed from the net holding member. It is an enlarged sectional view which shows the state which the engaging projection of a dustproof net engages with a guide member when the dustproof net is attached to a net holding member. FIG. 3 is an enlarged cross-sectional view showing a state in which the dustproof net is pressed by the spring member when the dustproof net is attached to the net holding member. It is a perspective view of the same position as FIG. FIG. 3 is a cross-sectional view of a net holding member, a dustproof net, a spring member also used as a guide, a net fixing member, a handle, and the like as viewed from the direction of arrow XIV-XIV in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, taking as an example the case where they are applied to a hydraulic excavator. In the embodiment, the traveling directions of the hydraulic excavator 1, which will be described later, will be referred to as front and rear directions, and the directions orthogonal to the traveling direction of the hydraulic excavator 1 will be described as left and right directions.

In the figure, the hydraulic excavator 1 is a crawler type lower traveling body 2 capable of self-propelling in the front and rear directions, an upper turning body 3 mounted on the lower traveling body 2 so as to be able to turn, and the front side of the upper turning body 3. It is configured to include the working device 4 provided in the above. The lower traveling body 2 and the upper turning body 3 constitute a main body (vehicle body) of the hydraulic excavator 1. The working device 4 is mounted on the front side of the upper swing body 3 so as to be swingable in the left and right directions via the swing post 4A. The hydraulic excavator 1 travels on the work site by the lower traveling body 2, and excavates earth and sand using the working device 4 while turning the upper turning body 3.

The upper swivel body 3 has a swivel frame 5. The swivel frame 5 constitutes the base of the upper swivel body 3 and is mounted on the lower traveling body 2 so as to be swivelable. As shown in FIG. 2, the swivel frame 5 is erected on a thick bottom plate 5A extending in the front and rear directions and a left vertical plate extending in the front and rear directions at intervals in the left and right directions. It is equipped with 5B and a right vertical plate 5C. A substantially triangular protrusion 5D is provided on the front end side of the bottom plate 5A, and the swing post 4A of the working device 4 is swingably supported by the protrusion 5D. Further, the swivel frame 5 is arranged on the left side of the left vertical plate 5B with an interval, and is arranged on the right side of the left side frame 5E extending in the front and rear directions and the right side of the right vertical plate 5C with an interval, and extends in the front and rear directions. It has a right side frame 5F.

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.

The cab 7 is provided on the left front side of the swivel frame 5. The cab 7 defines a driver's cab on which the operator is boarding. Inside the cab 7, for example, a driver's seat on which an operator sits, an operation lever for traveling, and an operation lever for work (none of which are shown) are arranged.

The engine 8 as a prime mover is located on the front side of the counterweight 6 and is provided on the rear side of the turning frame 5. The engine 8 is mounted on the rear side of the left vertical plate 5B and the right vertical plate 5C of the turning frame 5 in a horizontal position extending in the left and right directions. A hydraulic pump 9 is provided on the right side of the engine 8. The hydraulic pump 9 pressurizes the hydraulic oil by being driven by the engine 8, and discharges the hydraulic oil toward various hydraulic actuators mounted on the hydraulic excavator 1.

A cooling fan 10 is provided on the left side of the engine 8. The cooling fan 10 sucks in outside air by being rotationally driven by using the engine 8 as a power source, and supplies the outside air as cooling air into the building cover 11 described later. The cooling fan is not limited to the one that uses the engine 8 as a drive source, and for example, an electric fan or the like may be used.

The building cover 11 is located on the front side of the counterweight 6 and is provided on the swivel frame 5. The inside of the building cover 11 is a machine room, and the on-board equipment such as the engine 8, the hydraulic pump 9, and the heat exchange device 12 are housed in the building cover 11. The building cover 11 includes a left side cover 11A that is located behind the cab 7 and rises upward from the left side frame 5E, a right side cover (not shown) that rises upward from the right side frame 5F, and a left side surface. It includes an upper surface cover 11B that covers between the upper end of the cover 11A and the upper end of the right side cover. The left side cover 11A can be opened and closed between an open position that opens the machine room to the outside and a closed position that closes the machine room.

The heat exchange device 12 is located on the rear side of the cab 7 and on the left side of the engine 8 and is mounted on the swivel frame 5. The heat exchange device 12 is located in the building cover 11 (machine room) located upstream of the cooling fan 10 in the flow direction of the cooling air by the cooling fan 10 (direction indicated by arrow A in FIG. 2). .. The heat exchange device 12 includes a support frame 13, a radiator 14, an oil cooler 15, and the like.

The support frame 13 constitutes the outer frame of the heat exchange device 12. The support frame 13 is formed as a frame structure that surrounds and supports the radiator 14, the oil cooler 15, and the like, and is mounted on the swivel frame 5 as shown in FIG. The support frame body 13 includes a front frame 13A and a rear frame 13B that sandwich the radiator 14, an oil cooler 15, and the like from the front and rear directions, and an upper frame 13C and a front frame 13A that connect the upper portions of the front frame 13A and the rear frame 13B. And the lower frame 13D connecting the lower part of the rear frame 13B. The lower ends of the front frame 13A and the rear frame 13B of the support frame body 13 are attached to the swivel frame 5 by using bolts or the like. Here, a net holding member 16 described later is integrally formed at a portion of the support frame 13 that is upstream of the flow direction of the cooling air.

The radiator 14 is provided in the support frame body 13. The radiator 14 is connected to a water jacket (not shown) of the engine 8 and cools the engine cooling water flowing through the water jacket. The oil cooler 15 is provided in the support frame 13 adjacent to the radiator 14 in the front and rear directions. The oil cooler 15 is connected to, for example, a control valve and a hydraulic oil tank (neither is shown), and cools the hydraulic oil that returns from the hydraulic actuator to the hydraulic oil tank.

The net holding member 16 is provided on the upstream side of the heat exchange device 12 with respect to the flow direction of the cooling air. That is, the net holding member 16 is a portion of the support frame 13 of the heat exchange device 12 that is upstream of the radiator 14 and the oil cooler 15 with respect to the flow direction of the cooling air (left end side of the support frame 13). It is provided in the above and holds the dustproof net 25 described later. As shown in FIGS. 4 and 10, the net holding member 16 includes a net contact plate 17, a front side plate 18, a rear side plate 19, a lower support plate 20, and a net accommodating space 21. There is.

The net contact plate 17 of the net holding member 16 is arranged on the left end side of the support frame body 13 and is formed as a quadrangular frame body to which the dustproof net 25 abuts. As shown in FIG. 4, the net contact plate 17 is a pair of side plates extending upward and downward, that is, a front contact surface 17A and a rear contact surface 17B, and front and rear contact surfaces 17A and 17B. It is composed of an upper contact surface 17C whose upper end extends in the front and rear directions, and a narrow lower contact surface 17D whose lower ends of the front and rear contact surfaces 17A and 17B extend in the front and rear directions. The front contact surface 17A and the rear contact surface 17B are formed of elongated rectangular plates extending in the upward and downward directions, and are fixed to the front frame 13A and the rear frame 13B by means such as welding.

As a result, the net contact plate 17 is formed as a narrow frame-shaped frame, and in the central portion of the net contact plate 17, the front contact surface 17A, the rear contact surface 17B, the upper contact surface 17C, and the like. An opening 17E composed of a quadrangular square hole surrounded by the lower contact surface 17D is formed. Therefore, the cooling air generated by the cooling fan 10 is supplied to the heat exchange device 12 through the opening 17E of the net contact plate 17.

The front side plate 18 as one side plate of the net holding member 16 is provided on the left end side of the front frame 13A constituting the support frame body 13. The rear side plate 19 as the other side plate of the net holding member 16 is provided on the left end side of the rear frame 13B constituting the support frame body 13. The front side plate 18 and the rear side plate 19 face each other at intervals in the front and rear directions, and a net accommodating space 21 for accommodating the dustproof net 25 is formed between the front side plate 18 and the rear side plate 19. There is. A guide member 22 and a spring member 24, which will be described later, are provided on the surface of the front side plate 18 on the side of the net accommodating space 21. Further, a flat plate-shaped screw seat 19A is fixed to the surface of the rear side surface plate 19 opposite to the net accommodating space 21 by means such as welding.

The lower support plate 20 of the net holding member 16 is fixed to the lower contact surface 17D of the net contact plate 17. That is, the lower support plate 20 is composed of an elongated rectangular plate body extending in the front and rear directions between the front frame 13A and the rear frame 13B of the support frame body 13, and is formed in the direction of cooling air flow from the lower contact surface 17D. It protrudes to the upstream side. The lower support plate 20 supports the dustproof net 25 housed in the net storage space 21 from below.

The two guide members 22 are provided on the surface of the front side plate 18 constituting the net holding member 16 facing the rear side plate 19 so as to be separated from each other in the upward and downward directions. When the dustproof net 25 is held by the net holding member 16, the two guide members 22 engage the dustproof net 25 with the engagement projection 26F described later, whereby the dustproof net 25 is engaged with the front side plate 18 and the rear side plate. It guides to the net accommodation space 21 formed between 19 and 19.

As shown in FIG. 11, the two guide members 22 are formed by an L-shaped bent plate body, and are fixed to the front side surface plate 18 by means such as welding, and the mounting plate portion 22A and the mounting plate portion. It has a guide plate portion 22B that is bent from the tip of 22A and extends in a direction away from the net contact plate 17. The mounting plate portion 22A faces the front contact surface 17A of the net contact plate 17 in the left and right directions, and forms a gap 23 between the front contact surface 17A. The engaging projection 26F of the dustproof net 25 is configured to engage in the gap 23 between the mounting plate portion 22A and the front contact surface 17A. The guide plate portion 22B faces the front side surface plate 18, and the distance between the guide plate portion 22B and the front side surface plate 18 gradually increases from the base end 22B1 of the guide plate portion 22B toward the tip end 22B2. That is, the guide plate portion 22B has an inclined surface inclined with respect to the front side surface plate 18, and is configured to guide the engaging projection 26F of the dustproof net 25 toward the gap 23 along the inclined surface.

The spring member 24 is located between the two guide members 22 and is provided on the surface of the front side plate 18 facing the rear side plate 19. The spring member 24 presses the dustproof net 25 accommodated in the net accommodating space 21 toward the rear side surface plate 19 of the net holding member 16. As shown in FIGS. 7 and 11, the spring member 24 is formed by using an elastic plate such as spring steel, and has a mounting plate portion 24A located at the center in the length direction and both sides in the length direction. It has a pair of elastic plate portions 24B and 24C located at. The mounting plate portion 24A is mounted on the front side plate 18 using two bolts 24D.

The elastic plate portions 24B and 24C project from the mounting plate portion 24A to the rear side (rear side surface plate 19 side) in a state of being inclined with respect to the front side surface plate 18. The protruding ends of the elastic plate portions 24B and 24C form contact surfaces 24B1, 24C1 parallel to the front side surface plate 18 and abut against the net frame body 26 of the dustproof net 25. Then, the spring member 24 exerts a pressing force in the direction indicated by arrow B in FIG. 9 against the dustproof net 25 accommodated in the net accommodating space 21 by the restoring force (elastic force) of the elastic plate portions 24B and 24C. The dustproof net 25 is applied and pressed toward the rear side surface plate 19.

The dustproof net 25 is provided on the upstream side of the heat exchange device 12 with respect to the flow direction of the cooling air while being held by the net holding member 16. The dustproof net 25 captures dust mixed in the cooling air supplied in the building cover 11 and purifies the cooling air. As shown in FIGS. 5 and 6, the dustproof net 25 includes a net frame body 26 held by the net holding member 16 and a filter 27 attached to the net frame body 26.

The net frame body 26 constituting the outer frame of the dustproof net 25 is formed as a quadrangular frame body having a similar shape to the opening 17E formed in the net contact plate 17. That is, the net frame body 26 faces the net front frame 26A as one side frame extending upward and downward while facing the front side plate 18 of the net holding member 16 and the rear side plate 19 of the net holding member 16. The net rear frame 26B as another side frame extending in the upward and downward directions, the net upper frame 26C extending in the front and rear directions by connecting the upper ends of the net front frame 26A and the net rear frame 26B, and the net front frame 26A and The lower ends of the net rear frame 26B are connected to each other and formed in a frame shape by the net lower frame 26D extending in the front and rear directions. A square vent 26E through which cooling air flows is formed in the central portion of the net frame body 26.

Here, as shown in FIG. 9, the net front frame 26A of the net frame body 26 is a pressed surface pressed by the spring member 24 while the dustproof net 25 is held by the net holding member 16. .. As a result, a certain gap 28 corresponding to the mounting space of the spring member 24 is formed between the front side surface plate 18 of the net holding member 16 and the net front frame 26A. An engaging protrusion 26F is provided at the end of the net front frame 26A located on the net contact plate 17 side, and the net rear frame 26B is provided on the net contact plate 17 (rear contact surface 17B) side. A chamfered portion 26G is provided at the positioned end portion.

The engaging projection 26F is provided on the net front frame 26A, which is a pressed surface pressed by the spring member 24 of the net frame body 26. The engaging protrusion 26F is provided at the end of the net front frame 26A on the net contact plate 17 side, and is formed as a plate body overhanging in the gap 28 formed between the net front frame 26A and the front side plate 18. ing. That is, the engaging projection 26F is formed in a flat plate shape in which the dustproof net 25 is held by the net holding member 16 (state in FIG. 9) and abuts on the front contact surface 17A of the net contact plate 17. It extends upward and downward over the entire length of the front frame 26A. Here, as shown in FIG. 11, the plate thickness L1 of the engaging projection 26F is the gap 23 formed between the mounting plate portion 22A of the guide member 22 and the front contact surface 17A of the net contact plate 17. The length dimension (gap dimension) in the left and right directions is set to be smaller than L2 (L1 <L2). As a result, when the dustproof net 25 is inserted into the net accommodating space 21, the engaging protrusion 26F engages with the two guide members 22 provided in the front frame 13A of the support frame body 13, thereby causing a gap. You will be guided to the inside of 23.

On the other hand, as shown in FIG. 9, by providing the spring member 24 on the front side surface plate 18, a gap 28 is formed between the front side surface plate 18 and the net front frame 26A. When the length dimension L3 in the front and rear directions of the gap 28 becomes larger (L3> L4) than the length dimension L4 in the front and rear directions of the front contact surface 17A constituting the net contact plate 17, the net hits. A part of the opening 17E formed in the contact plate 17 may protrude from the net front frame 26A of the net frame body 26. However, the net front frame 26A is provided with a flat plate-shaped engaging protrusion 26F over its entire length, and the engaging protrusion 26F abuts on the front contact surface 17A of the net contact plate 17. As a result, the space between the net front frame 26A of the net frame body 26 and the opening 17E of the net contact plate 17 is sealed by the engaging projection 26F.

The chamfered portion 26G is provided on the net rear frame 26B facing the rear side surface plate 19 of the net frame body 26, and is inclined toward the net front frame 26A. The chamfered portion 26G has the net front frame 26A and the net rear frame 26B by bending the end portion of the net rear frame 26B on the net contact plate 17 side diagonally toward the front side (net front frame 26A side). The distance between the front and the back is formed as an inclined surface that becomes smaller as it approaches the net contact plate 17. The chamfered portion 26G is provided over the entire length of the net rear frame 26B, and the inclination angle of the chamfered portion 26G with respect to the net rear frame 26B is set to, for example, about 45 °. As a result, when the dustproof net 25 is inserted into the net accommodating space 21, the chamfered portion 26G is in sliding contact with the edge portion 19B of the rear side surface plate 19, and the net rear frame 26B is guided to the net contact plate 17.

The filter 27 is detachably attached to the net frame 26 with the vent 26E of the net frame 26 covered. The filter 27 purifies the cooling air by capturing the dust mixed in the cooling air when the cooling air supplied into the building cover 11 passes through the vent 26E of the net frame body 26. In order to remove a large amount of dust captured by the filter 27, the dustproof net 25 is subjected to maintenance work such as periodic cleaning.

The handle 29 is provided on the net frame body 26 of the dustproof net 25 and constitutes a part of the dustproof net 25. As shown in FIGS. 5 and 6, the handle 29 is formed by bending a rod-shaped body, and is gripped by an operator when the dustproof net 25 is attached to and detached from the net holding member 16. The handle 29 has a pair of upper and lower mounting portions 29A attached to the net frame body 26, and a U-shaped grip portion 29B connecting the tip ends of the pair of mounting portions 29A. The base end side of the pair of mounting portions 29A is fixed to the net rear frame 26B of the net frame body 26 by welding or the like, and the tip end side protrudes to the outside of the net frame body 26. A space for inserting a worker's hand is secured between the grip portion 29B and the net rear frame 26B.

Here, as shown in FIG. 9, when the dustproof net 25 is inserted into the net accommodating space 21 of the net holding member 16, the pair of mounting portions 29A constituting the handle 29 are attached to the end edge portion 19B of the rear side surface plate 19. Contact. As a result, the net frame body 26 of the dustproof net 25 can be prevented from strongly contacting the net contact plate 17, and the durability of the dustproof net 25 can be improved. Further, a plate-shaped screw seat 29C is fixed to the grip portion 29B, and a hook member 31 described later is attached to the screw seat 29C.

The net fixing member 30 is provided on the rear side surface plate 19 of the net holding member 16 and the dustproof net 25. As shown in FIG. 9, the net fixing member 30 presses the dustproof net 25 accommodated in the net accommodating space 21 against the net contact plate 17 and fixes the net fixing member 30 at a position covering the opening 17E. Here, the net fixing member 30 is composed of a hook member 31 provided on the handle 29 of the dustproof net 25 and a hooking member 32 provided on the rear side surface plate 19.

The hook member 31 is formed of a plate body bent in a J shape, and is attached to the screw seat 29C of the handle 29 by using a bolt 31A. The hooking member 32 is attached to the screw seat 19A of the rear side surface plate 19 by using a bolt 32A. The hooking member 32 has a hooking tool 32B that is hooked to the hook member 31, and an operating tool 32C that engages and disengages the hooking tool 32B from the hook member 31.

As shown in FIG. 9, with the dustproof net 25 housed in the net accommodating space 21, the hooking tool 32B is operated by the operating tool 32C of the hooking member 32, and the hooking tool 32B is provided on the handle 29. It is engaged with the hook member 31 and hooked. As a result, the dustproof net 25 is fixed at a position that covers the opening 17E while being pressed against the net contact plate 17. On the other hand, as shown in FIG. 10, the dustproof net 25 is taken from the net accommodating space 21 by operating the hooking tool 32B by the operating tool 32C of the hooking member 32 and separating the hooking tool 32B from the hook member 31. Be removed. Here, when the hook 32B is detached from the hook member 31, the force of the net fixing member 30 to press the dustproof net 25 against the net contact plate 17 is released, and the dustproof net 25 can be easily moved from the net accommodation space 21. It is configured to be removable.

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

The operator gets on the cab 7 and sits in the driver's seat. In this state, by starting the engine 8 and operating the operating lever for traveling, the hydraulic excavator 1 can be advanced or retracted by the lower traveling body 2. Further, by operating the operation lever for work, the operator can perform excavation work of earth and sand using the work device 4 while turning the upper swivel body 3.

When the engine 8 is operating, the cooling fan 10 rotates, outside air is introduced into the building cover 11 through the dustproof net 25, and this outside air becomes cooling air and circulates in the direction of arrow A in FIG. 2, thereby causing a heat exchange device. It is supplied to 12. The heat exchange device 12 cools the engine cooling water by the radiator 14 and cools the hydraulic oil by the oil cooler 15 by exchanging heat with the cooling air.

At this time, the dust mixed in the cooling air is captured by the filter 27 of the dustproof net 25. As a result, dust can be separated from the cooling air and the cleaned cooling air can be supplied to the heat exchange device 12. As a result, it is possible to prevent dust from adhering to the heat exchange device 12 and clogging it, and it is possible to maintain good cooling performance by the heat exchange device 12 for a long period of time.

Here, in order to remove a large amount of dust adhering to the filter 27 of the dustproof net 25, it is necessary to periodically perform maintenance work such as cleaning of the dustproof net 25, and the maintenance work for the dustproof net 25 will be described below. do.

In the stage before removing the dustproof net 25, as shown in FIG. 9, the dustproof net 25 is pressed against the rear side surface plate 19 by the restoring force of the spring member 24 provided on the front side surface plate 18 by the net fixing member 30. , It is fixed at a position covering the opening 17E in a state of being pressed against the net contact plate 17 in the net accommodating space 21.

Next, when removing the dustproof net 25, as shown in FIG. 10, the operating tool 32C of the hooking member 32 constituting the net fixing member structure 30 is operated, and the hook provided on the handle 29 of the dustproof net 25 is operated. The hook 32B is detached from the member 31. As a result, the force of the net fixing member 30 to press the dustproof net 25 against the net contact plate 17 can be released. In this state, the dustproof net 25 can be removed from the net accommodating space 21 of the net holding member 16 by pulling the handle 29 in the direction of arrow F1.

In this case, the restoring force (elastic force) of the spring member 24 acts only in the direction of pressing the dustproof net 25 against the rear side surface plate 19, and the force of pressing the dustproof net 25 against the net contact plate 17 does not act. .. Therefore, the dustproof net 25 can be easily removed from the net accommodating space 21 by simply pulling the handle 29 in the direction of arrow F1 with the hook 32B detached from the hook member 31. As a result, it is possible to quickly perform maintenance work for removing the dust adhering to the filter 27 on the removed dustproof net 25, and it is possible to improve the workability.

Next, the work of holding the dustproof net 25 for which the maintenance work has been completed by the net holding member 16 will be described.

When the dustproof net 25 is held by the net holding member 16, the dustproof net 25 is inserted into the net accommodating space 21 of the net holding member 16. At this time, as shown by arrow F2 in FIG. 10, the engaging projection 26F provided on the net front frame 26A of the net frame body 26 is engaged with the two guide members 22 provided on the front side surface plate 18. Let me. Here, the guide plate portion 22B of the guide member 22 has an inclined surface inclined with respect to the front side surface plate 18. Therefore, the engaging protrusion 26F moves toward the net contact plate 17 side along the guide plate portion 22B which is an inclined surface, and is between the mounting plate portion 22A of the guide member 22 and the net contact plate 17. You will be guided to the gap 23.

Then, the engagement protrusion 26F is inserted into the gap 23 between the guide member 22 and the net contact plate 17, so that the dustproof net 25 is formed between the front side surface plate 18 and the rear side surface plate 19. It can be smoothly inserted into the net accommodating space 21. At this time, as shown in FIGS. 11 and 12, the net front frame 26A of the net frame body 26 abuts on the elastic plate portions 24B and 24C of the spring member 24 provided on the front side plate 18, and the spring member 24 is elastically deformed. .. As a result, the spring member 24 generates a restoring force in the direction of arrow B in FIG. 12 and presses the dustproof net 25 toward the rear side surface plate 19.

Then, the handle 29 is pushed toward the net contact plate 17 while the engaging projection 26F is inserted into the inner part of the gap 23 (front side plate 18 side) against the restoring force of the spring member 24. As a result, as shown in FIG. 9, the net rear frame 26B of the net frame body 26 can be brought into contact with the rear side surface plate 19, and the dustproof net 25 can be accommodated in the net accommodating space 21.

In this case, the net rear frame 26B of the net frame body 26 has an inclined surface inclined toward the net front frame 26A, and a chamfered portion 26G inclined by about 45 ° with respect to the net rear frame 26B is formed. As a result, when the dustproof net 25 is inserted into the net accommodation space 21, the chamfered portion 26G is in sliding contact with the edge portion 19B of the rear side surface plate 19, so that the net rear frame 26B is smoothly brought into the net contact plate 17. Can be guided. In this way, the dustproof net 25 can be accommodated in the net accommodating space 21 by abutting the net rear frame 26B on the net abutting plate 17.

When the dustproof net 25 is housed in the net storage space 21, the attachment portion 29A of the handle 29 provided on the dustproof net 25 comes into contact with the end edge portion 19B of the rear side surface plate 19. As a result, the net frame body 26 of the dustproof net 25 can be prevented from strongly contacting the net contact plate 17, and the durability of the dustproof net 25 can be improved.

In this way, the dustproof net 25 accommodated in the net accommodating space 21 is supported by the lower support plate 20 of the net holding member 16 from below, and is supported by the restoring force of the spring member 24 on the rear side surface plate 19. It is pressed with a moderate force. As a result, the dustproof net 25 can be held in a stable state at a position covering the opening 17E of the net contact plate 17. In this case, the spring member 24 is provided on the front side surface plate 18, so that a gap 28 is formed between the front side surface plate 18 and the net front frame 26A. Therefore, when the length dimension L3 in the front and rear directions of the gap 28 becomes larger than the length dimension L4 in the front and rear directions of the front contact surface 17A constituting the net contact plate 17, the net contact plate 17 There is a possibility that a part of the opening 17E of the net frame body 26 protrudes from the net front frame 26A of the net frame body 26. On the other hand, in the present embodiment, a flat plate-shaped engaging protrusion 26F is provided over the entire length of the net front frame 26A, and the engaging protrusion 26F abuts on the front contact surface 17A of the net contact plate 17. ing. As a result, the space between the net front frame 26A and the opening 17E of the net contact plate 17 can be sealed by the engaging protrusion 26F, and the cooling air containing dust can be sealed into the building cover 11 through the opening 17E. It can be prevented from flowing.

Then, with the dustproof net 25 housed in the net accommodating space 21, the hooking tool 32B is operated by the operating tool 32C of the hooking member 32, and the hooking tool 32B is attached to the hook member 31 provided on the handle 29. Engage and hook. As a result, the dustproof net 25 can be fixed at a position that covers the opening 17E of the net contact plate 17.

In this way, the dustproof net 25 covers the opening 17E in a state of being pressed against the rear side surface plate 19 by the restoring force of the spring member 24 and in a state of being pressed against the net contact plate 17 by the net fixing member 30. It is fixed in the same position. In this case, the restoring force of the spring member 24 acts only in the direction of pressing the dustproof net 25 against the rear side surface plate 19, and does not act in the direction of pressing the dustproof net 25 against the net contact plate 17. As a result, at the time of maintenance of the dustproof net 25, the dustproof net 25 is removed by operating the operation tool 32C of the hooking member 32 and separating the hooking tool 32B from the hook member 31 provided on the handle 29 of the dustproof net 25. The force pressing against the net contact plate 17 can be released. Therefore, the dustproof net 25 can be easily removed from the net accommodating space 21 by simply detaching the hook 32B from the hook member 31 of the net fixing member 30, and maintenance workability can be improved.

Moreover, since the dustproof net 25 can be easily removed only by operating the net fixing member 30, it is not necessary to weaken the restoring force of the spring member 24 in consideration of this removal work. Therefore, the dustproof net 25 can be pressed against the rear side surface plate 19 by an appropriate restoring force of the spring member 24. As a result, even if a large vibration is generated during the traveling or excavation work of the hydraulic excavator 1, it is possible to prevent the dustproof net 25 from falling off from the net holding member 16 or being displaced. As a result, by reliably capturing the dust contained in the cooling air by the dustproof net 25, clean cooling air can be supplied into the building cover 11, and the cooling performance by the heat exchange device 12 is maintained well. can do.

Thus, according to the present invention, the upper swivel body 3 of the hydraulic excavator 1 blows cooling air into the swivel frame 5, the building cover 11 provided on the swivel frame 5 and covering the on-board equipment including the engine 8, and the building cover 11. The cooling fan 10 to be supplied, the heat exchange device 12 located in the building cover 11 and provided on the swivel frame 5, and the net holding member provided on the upstream side of the heat exchange device 12 with respect to the flow direction of the cooling air. A dustproof net 25 that is held by the net holding member 16 and captures dust mixed in the cooling air is provided.

The net holding member 16 is a net in which an opening 17E through which cooling air flows is formed and the dustproof net 25 is in contact with the net contact plate 17, and the net contact plate 17 is sandwiched between the net contact plate 17 and the dustproof net 25 is accommodated. It has a pair of front side plates 18 and rear side plates 19 forming an accommodation space 21, and the front side plates 18 guide the dustproof net 25 to the net accommodation space 21 when the dustproof net 25 is held by the net holding member 16. A guide member 22 and a spring member 24 for pressing the dustproof net 25 housed in the net accommodating space 21 toward the rear side surface plate 19 are provided, and the dustproof net 25 is provided on the rear side surface plate 19 and the dustproof net 25. A net fixing member 30 is provided which is pressed against the net contact plate 17 and fixed at a position covering the opening 17E.

According to this configuration, the dustproof net 25 is guided to the net accommodating space 21 by the guide member 22 provided on the front side surface plate 18, and is pressed against the rear side surface plate 19 by the spring member 24. In this case, the restoring force of the spring member 24 does not act in the direction of pressing the dustproof net 25 against the net contact plate 17, so that the workability when removing the dustproof net 25 from the net accommodating space 21 can be improved. On the other hand, the dustproof net 25 accommodated in the net accommodating space 21 can be pressed against the net contact plate 17 by the net fixing member 30 and fixed at a position covering the opening 17E. Therefore, the dustproof net 25 can be easily removed from the net accommodation space 21 by separating the hook 32B from the hook member 31 of the net fixing member 30 and releasing the force for pressing the dustproof net 25 against the net contact plate 17. It can be removed and maintenance workability can be improved.

According to the present invention, the dustproof net 25 includes a net frame body 26 held by the net holding member 16 and a filter 27 attached to the net frame body 26, and the net frame body 26 is dustproof. An engaging projection 26F that engages with the guide member 22 when the net 25 is inserted into the net accommodating space 21 is provided. According to this configuration, the dustproof net 25 can be guided to the net accommodating space 21 by engaging the engaging projection 26F provided on the net frame body 26 with the guide member 22.

According to the present invention, the engaging protrusion 26F is provided on the net front frame 26A pressed by the spring member 24 of the net frame body 26, and the gap 23 formed between the net front frame 26A and the front side plate 18 is provided. It is formed as a plate body that seals between the opening 17E of the net contact plate 17 and the net front frame 26A. According to this configuration, the engaging projection 26F formed as a plate body abuts on the net contact plate 17 in a state of projecting into the gap 23 formed between the net front frame 26A and the front side surface plate 18. As a result, the space between the net front frame 26A and the opening 17E of the net contact plate 17 can be sealed by the engaging protrusion 26F, and the cooling air containing dust can be sealed into the building cover 11 through the opening 17E. It can suppress the flow.

According to the present invention, the net fixing member 30 is provided on the hook member 31 provided on the dustproof net 25 and the rear side surface plate 19, and is hooked on the hook member 31 to hold the dustproof net 25 on the net holding member 16. It is composed of a hooking tool 32B fixed to the hook member 32B and a hooking member 32 having an operating tool 32C for engaging and disengaging the hooking tool 32B with respect to the hook member 31. According to this configuration, the dustproof net 25 is attached to the net holding member 16 by engaging the hooking tool 32B of the hooking member 32 provided on the rear side surface plate 19 with the hook member 31 provided on the dustproof net 25. Can be fixed to. Further, the dustproof net 25 can be removed from the net holding member 16 by separating the hooking tool 32B of the hooking member 32 from the hook member 31.

According to the present invention, the dustproof net 25 is provided with a handle 29 that is gripped when the dustproof net 25 is attached to and detached from the net holding member 16, and the hook member 31 of the net fixing member 30 is provided on the handle 29. Has been done. According to this configuration, the hook member 31 can be attached by using the handle 29 integrally provided on the dustproof net 25.

According to the present invention, the handle 29 has a mounting portion 29A attached to the dustproof net 25 and projecting to the outside of the dustproof net 25, and a grip portion 29B connected to the mounting portion 29A. Is configured to abut on the edge portion 19B of the rear side surface plate 19 when the dustproof net 25 is accommodated in the net accommodating space 21 of the net holding member 16. According to this configuration, when the dustproof net 25 is housed in the net storage space 21, the mounting portion 29A of the handle 29 comes into contact with the edge portion 19B of the rear side surface plate 19. As a result, the net frame body 26 of the dustproof net 25 can be prevented from strongly contacting the net contact plate 17, and the durability of the dustproof net 25 can be extended.

According to the present invention, the net rear frame 26B facing the rear side plate 19 of the net frame 26 is formed as an inclined surface inclined toward the net front frame 26A, and the dustproof net 25 is provided in the net accommodating space 21. A chamfered portion 26G that slides into contact with the edge portion 19B of the rear side surface plate 19 when inserted is provided. According to this configuration, when the dustproof net 25 is inserted into the net accommodating space 21, the chamfered portion 26G is in sliding contact with the edge portion 19B of the rear side surface plate 19, so that the net rear frame 26B is brought into the net contact plate 17. Can be guided.

In the embodiment, the configuration in which the front side surface plate 18 of the net holding member 16 is provided with the two guide members 22 and the spring member 24 made of a member different from the guide member 22 is exemplified . In the reference example shown in FIGS. 13 and 14, the front side plate 18 of the net holding member 16 is provided with the guide / spring member 33.

Here, the guide-combined spring member 33 has a mounting plate portion 33A located at the center in the length direction and a pair of elastic plate portions 33B located on both sides in the length direction, similarly to the spring member 24 according to the embodiment. , 33C, and the mounting plate portion 33A is mounted on the front side plate 18 using a bolt 33D. The edge portion of the pair of elastic plate portions 33B and 33C on the net contact plate 17 side constitutes a guide portion 33E to which the engaging projection 26F of the dustproof net 25 is engaged. Therefore, when the engaging projection 26F of the dustproof net 25 engages with the guide portion 33E, the dustproof net 25 is guided to the net accommodating space 21. The pair of elastic plate portions 33B and 33C form a pressing portion that presses the dustproof net 25 toward the rear side surface plate 19. Therefore, the restoring force of the pair of elastic plate portions 33B and 33C acts on the dustproof net 25 accommodated in the net accommodating space 21, so that the dustproof net 25 is pressed toward the rear side surface plate 19 with an appropriate force. On the other hand, the rear side surface plate 19 and the dustproof net 25 are provided with a net fixing member 30 similar to that of the embodiment.

As described above, it has a guide portion 33E for guiding the dustproof net 25 to the net accommodation space 21, and a pair of elastic plate portions 33B and 33C as pressing portions for pressing the dustproof net 25 toward the rear side surface plate 19. By using the guide-combined spring member 33, the number of parts can be reduced, which can contribute to cost reduction.

Further, in the embodiment, the net holding member 16 is provided at a portion of the support frame 13 constituting the heat exchange device 12 on the upstream side of the radiator 14 and the oil cooler 15 with respect to the flow direction of the cooling air. The case is illustrated. However, the present invention is not limited to this, for example, a net holding member formed of a member different from the support frame 13 of the heat exchange device 12 is formed, and the net holding member is used as a support frame with respect to the flow direction of the cooling air. It may be configured to be arranged on the upstream side of 13.

Further, in the embodiment, a case where the guide member 22 and the spring member 24 are provided on the front side surface plate 18 of the net holding member 16 and the net fixing member 30 is provided on the rear side surface plate 19 and the dustproof net 25 is illustrated. However, the present invention is not limited to this, and for example, the guide member 22 and the spring member 24 may be provided on the rear side surface plate 19, and the net fixing member 30 may be provided on the front side surface plate 18 and the dustproof net 25.

Further, in the embodiment, the hydraulic excavator 1 provided with the crawler type lower traveling body 2 has been described as an example. However, the present invention is not limited to this, and may be applied to a hydraulic excavator provided with a wheel-type lower traveling body.

1 Hydraulic excavator (construction machinery)
2 Lower running body (main body)
3 Upper swivel body (main body)
4 Working equipment 5 Swing frame 8 Engine (motor)
10 Cooling fan 11 Building cover 12 Heat exchanger 16 Net holding member 17 Net contact plate 17E Opening 18 Front side plate (one side plate)
19 Rear side plate (the other side plate)
19B End edge 21 Net accommodation space 22 Guide member 24 Spring member 25 Dustproof net 26 Net frame body 26A Net front frame (one side frame)
26B net rear frame (other side frame)
26F Engagement protrusion 26G Chamfering part 27 Filter 29 Handle 30 Net fixing member 31 Hook member 32 Hooking member 32B Hooking tool 32C Operating tool 33 Guide combined spring member 33B, 33C Elastic plate part (pressing part)
33E guide section

Claims (6)

It consists of a self-propelled main body and a work device provided on the front side of the main body.
The main body has a building cover that covers on-board equipment including a prime mover, a cooling fan that supplies cooling air into the building cover, a heat exchange device provided in the building cover, and the flow direction of the cooling air. In a construction machine provided with a net holding member provided on the upstream side of the heat exchange device and a dustproof net held by the net holding member and capturing dust mixed in the cooling air.
The net holding member has a net accommodating space in which an opening through which the cooling air flows is formed and the dustproof net abuts on the net abutting plate, and the net abutting plate is sandwiched between the net abutting plate and the dustproof net is accommodated. With a pair of side plates to form
One side plate of the pair of side plates includes a guide member that guides the dust-proof net to the net accommodating space when the dust-proof net is held by the net holding member.
A spring member is provided to press the dustproof net housed in the net accommodating space toward the other side plate of the pair of side plates.
The other side plate and the dustproof net are provided with a net fixing member that presses the dustproof net against the net contact plate and fixes the dustproof net at a position covering the opening .
The dustproof net is configured to include a net frame body held by the net holding member and a filter attached to the net frame body.
A construction machine characterized in that the net frame body is provided with an engaging projection that engages with the guide member when the dustproof net is inserted into the net accommodating space . The engaging protrusion is provided on a pressed surface of the net frame body pressed by the spring member, and is projected into a gap formed between the pressed surface and one of the side plates. The construction machine according to claim 1 , wherein the construction machine is formed as a plate body that seals between the opening of the net contact plate and the pressed surface. The net fixing member includes a hook member provided on the dustproof net and a hook member.
A hooking tool provided on the other side plate and hooked to the hook member to fix the dustproof net to the net holding member, and the hooking tool are engaged with and disengaged from the hook member. The construction machine according to claim 1, wherein the construction machine is composed of a hook member having a hooking tool for making the machine work. The dustproof net is provided with a handle that is gripped when the dustproof net is attached to and detached from the net holding member.
The construction machine according to claim 3 , wherein the hook member of the net fixing member is provided on the handle. The handle has a mounting portion attached to the dustproof net and projecting to the outside of the dustproof net, and a grip portion connected to the mounting portion.
4. The attachment portion of the handle is characterized in that the dustproof net abuts on the edge portion of the other side plate when the dustproof net is accommodated in the net accommodating space of the net holding member. Construction machinery described in. The net frame body has one side frame facing the one side plate and the other side frame facing the other side plate while the dustproof net is held by the net holding member.
The construction machine according to claim 1 , wherein a chamfered portion inclined toward the one side frame is formed on the net contact plate side of the other side frame.

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