Construction machine

Abstract

To reduce the number of labor hours required for cleaning a heat exchanger or its dustproof member mounted on a construction machine.SOLUTION: A construction machine 1 comprises: a machine room 15 housing heat exchangers 18, 19; a cover 16 covering the machine room 15; and a dustproof device 20 preventing dust from entering the heat exchangers 18, 19. The cover 16 has a vent 17 for circulating outside air into the machine room 15. The dustproof device 20 comprises: dustproof plates 21, 22 capable of capturing dust, movably attached along an inner surface 16a of the cover 16 and covering the vent 17; rollers 25, 26 for winding up the dustproof plates 21, 22; and brushes 27, 28 for contacting the dustproof plates 21, 22 wound up on the rollers 25, 26. The dustproof plates 21, 22, the rollers 25, 26, and the brushes 27, 28 are attached to the inner surface 16a of the cover 16.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to construction machinery.

Background Art

[0002] Construction machinery such as hydraulic excavators or wheel loaders is equipped with heat exchangers such as oil coolers or radiators. To prevent clogging of the vents of the heat exchanger, a dust-proof member such as a dust-proof net is attached to the heat exchanger. This type of dust-proof member serves as a filter that blocks dust or debris in the outside air and needs to be cleaned or replaced regularly.

[0003] For example, Patent Document 1 discloses a heat exchanger device having a plurality of heat exchangers arranged at predetermined intervals in the flow direction of cooling air, a plurality of support means for supporting each of these plurality of heat exchangers with respect to the floor surface, a front net member detachably provided at a position in front of the heat exchanger on the most upstream side of the cooling air among the plurality of heat exchangers to prevent intrusion of floating foreign matter, an upper control means detachably provided at an upper position of a gap formed between the plurality of heat exchangers to prevent intrusion of floating foreign matter, and a side control means provided at a side position of the gap formed between the plurality of heat exchangers to prevent intrusion of floating foreign matter, and integrating the front net member and the upper control means, wherein the lower ends of the front net member and the side control means are extended to the vicinity of the floor surface.

[0004] Patent Document 2 discloses a dust-proof device for a heat exchanger or the like provided with a dust-proof net, in which a pair of rollers are arranged sandwiching a portion to be dust-proofed of the heat exchanger or the like, the dust-proof net is formed in a strip shape, the dust-proof net can be wound around or unwound from the pair of rollers, and by moving the strip-shaped dust-proof net in the longitudinal direction, the dust-proof net covering the portion to be dust-proofed is substantially replaced.

Prior Art Documents

Patent Documents

[0005] Patent Document 1 Japanese Patent No. 3771654 Patent Document 2 Japanese Utility Model Laid-Open No. 4-129684 Summary of the Invention Problems to be Solved by the Invention

[0006] In the heat exchanger device disclosed in Patent Document 1, a net-like control net, which is a control means, is detachably attached to the heat exchanger so that the heat exchanger can be easily cleaned. However, in the heat exchanger device disclosed in Patent Document 1, when cleaning the heat exchanger or the control net, it is necessary to remove the control net from the heat exchanger, which takes a lot of man-hours.

[0007] In the dust-proof device disclosed in Patent Document 2, the dust-proof net can be wound up by a winding mechanism so that the dust-proof net can be maintained in a state without clogging. However, in the dust-proof device disclosed in Patent Document 2, after using all the surfaces of the strip-shaped dust-proof net, it is necessary to remove the dirty dust-proof net and clean it. Therefore, in the dust-proof device disclosed in Patent Document 2, when cleaning the heat exchanger or the dust-proof net, it is necessary to remove the dust-proof net and the winding mechanism from the heat exchanger, which takes a lot of man-hours.

[0008] In view of the above circumstances, an object of the present invention is to suppress the man-hours required for cleaning a heat exchanger mounted on a construction machine or its dust-proof member. Means for Solving the Problems

[0009] In order to solve the above problems, a construction machine according to the present invention includes a machine room that houses a heat exchanger mounted on a vehicle body, a cover that covers the machine room, and a dustproof device that prevents dust from entering the heat exchanger. The cover has a ventilation opening for circulating outside air inside the machine room, and the dustproof device includes a dustproof plate that can capture the dust and is movably attached along the inner surface of the cover to cover the ventilation opening, a roller that winds up the dustproof plate, and a brush that abuts against the dustproof plate wound around the roller. The dustproof plate, the roller, and the brush are attached to the inner surface of the cover.

Advantages of the Invention

[0010] According to the present invention, it is possible to suppress the man-hours required for cleaning the heat exchanger mounted on the construction machine or its dustproof member.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. For components with the same reference numerals in each embodiment, unless otherwise specified, they have the same components in each embodiment, and the description thereof will be omitted.

[0013] In the present embodiment, the direction of the line of sight of the operator sitting in the driver's seat in the cab 5 is defined as "front", and the opposite direction is defined as "rear". The direction toward the right side of the operator sitting in the driver's seat and perpendicular to the front-rear direction is defined as "right", and the opposite direction is defined as "left". The direction toward the upper side of the operator sitting in the driver's seat and perpendicular to the front-rear direction and the left-right direction is defined as "upward", and the opposite direction is defined as "downward".

[0014] FIG. 1 is a side view showing the configuration of the construction machine 1. FIG. 2 is a view showing the upper swing body 3 with the cover 16 shown in FIG. 1 opened. FIG. 3 is a view showing the through hole 4a formed in the vehicle body frame 4 shown in FIG. 2.

[0015] The construction machine 1 is a construction machine in which heat exchangers 18 and 19 are mounted on the vehicle body. The construction machine 1 may be, for example, a hydraulic excavator, a wheel loader, a crane, or the like. In the present embodiment, the hydraulic excavator will be described as an example of the construction machine 1.

[0016] As shown in FIG. 1, the construction machine 1 includes a self-propelled lower traveling body 2, an upper swing body 3 rotatably mounted on the lower traveling body 2, and a working device 6 rotatably mounted on the front portion of the upper swing body 3.

[0017] The working device 6 is an articulated working device that performs excavation work and the like. The working device 6 includes a boom 7 rotatably attached to the upper swing body 3, an arm 8 rotatably attached to the boom 7, and a bucket 9 rotatably attached to the arm 8. The boom 7, the arm 8, and the bucket 9 are respectively supported by a boom cylinder 10, an arm cylinder 11, and a bucket cylinder 12, and are driven by these hydraulic cylinders 10 to 12. Further, the construction machine 1 may be provided with a blade 13 disposed in front of the lower traveling body 2 as a working device for performing leveling work and the like.

[0018] The upper swing body 3 includes a vehicle body frame 4 that forms a support structure of the upper swing body 3. The working device 6 is provided at the front portion of the vehicle body frame 4. A cab 5 for an operator to board is provided at the left portion of the vehicle body frame 4. A counterweight 14 for balancing the weight with the working device 6 is provided at the rear portion of the vehicle body frame 4. A machine room 15 is provided at the rear portion of the vehicle body frame 4 and on the front side of the counterweight 14.

[0019] As shown in FIG. 2, the machine room 15 is an internal space of the upper swing body 3 and houses heat exchangers 18 and 19. The heat exchangers 18 and 19 include a radiator 18 that cools the cooling water of the engine, which is the power source of the working device 6, and an oil cooler 19 that cools the hydraulic oil supplied to the hydraulic cylinders 10 to 12 and the like. The floor surface of the machine room 15 is constituted by the vehicle body frame 4. The vehicle body frame 4 that constitutes the floor surface of the machine room 15 has a through hole 4a that penetrates the floor surface of the machine room 15 as shown in FIG. 3. An opening 15a of the machine room 15 is formed at the right portion of the upper swing body 3.

[0020] As shown in FIGS. 2 and 3, the opening 15a of the machine room 15 is covered by a cover 16. The cover 16 is also referred to as a side cover or a maintenance cover. The cover 16 is provided to be openable and closable with respect to the opening 15a of the machine room 15 so that access to the machine room 15 is possible during maintenance. For example, the cover 16 may be supported to be openable and closable using a hinge fixed to the front edge of the opening 15a of the machine room 15. The cover 16 has ventilation openings 17 for allowing outside air to flow inside the machine room 15. As shown in FIG. 1, a plurality of ventilation openings 17 may be provided at intervals in the vertical direction. A dust-proof device 20 is provided on the inner surface 16a of the cover 16.

[0021] FIG. 4 is a diagram showing the configuration of the dust-proof device 20 shown in FIG. 2. FIG. 5 is an enlarged side view of the dust-proof plates 21 and 22 wound around the rollers 25 and 26 shown in FIG. 4. FIG. 6 is a view of the brushes 27 and 28 and the receiving plate 31 shown in FIG. 4 as viewed from the cover 16 side.

[0022] The dust-proof device 20 is a device for preventing dust from entering the heat exchangers 18 and 19. As shown in FIG. 4, the dust-proof device 20 includes dust-proof plates 21 and 22, guide rails 23 and 24, rollers 25 and 26, brushes 27 and 28, motors 29 and 30, and a receiving plate 31.

[0023] The dust-proof plates 21 and 22 are plates for preventing dust from entering the heat exchangers 18 and 19. The dust-proof plates 21 and 22 are constituted by a plurality of rectangular metal plates having a plurality of apertures formed in a fine mesh-like pattern being connected in the short side direction of the metal plates. The dust-proof plates 21 and 22 are formed in a blind-like or shutter-like shape extending in the vertical direction along the inner surface 16a of the cover 16. The dust-proof plates 21 and 22 are attached to the inner surface 16a of the cover 16. The dust-proof plates 21 and 22 are attached to be movable in the vertical direction along the inner surface 16a of the cover 16. The dust-proof plates 21 and 22 cover the ventilation openings 17 of the cover 16 from the machine room 15 side. The dust-proof plates 21 and 22 have the function of a filter that captures dust entering from the ventilation openings 17 and prevents dust from entering the machine room 15 while allowing the inflow of outside air from the ventilation openings 17 into the machine room 15.

[0024] The dust-proof plates 21 and 22 include a first dust-proof plate 21 and a second dust-proof plate 22 formed with an aperture ratio different from that of the first dust-proof plate 21. The aperture ratio indicates the ratio of the area of the apertures to the area of each metal plate constituting the dust-proof plates 21 and 22. The aperture ratio indicates the fineness or coarseness. The aperture ratio of the second dust-proof plate 22 may be larger (the eyes may be coarser) than the aperture ratio of the first dust-proof plate 21. Alternatively, the aperture ratio of the second dust-proof plate 22 may be smaller (the eyes may be finer) than the aperture ratio of the first dust-proof plate 21.

[0025] The first dust-proof plate 21 and the second dust-proof plate 22 are attached to the inner surface 16a of the cover 16 in a state of being overlapped with each other. Specifically, the first dust-proof plate 21 and the second dust-proof plate 22 are attached to the inner surface 16a in a state of being laminated along the flow direction of the outside air at the ventilation openings 17. The first dust-proof plate 21 is disposed on the cover 16 side, and the second dust-proof plate 22 is disposed on the machine room 15 side. The vertical length of the first dust-proof plate 21 is longer than the vertical length of the second dust-proof plate 22. The lower end portion of the first dust-proof plate 21 is disposed below the lower end portion of the second dust-proof plate 22.

[0026] The guide rails 23 and 24 are rails that sandwich the dust-proof plates 21 and 22 so as to be movable in the vertical direction. The guide rails 23 and 24 are constituted by a pair of rails that extend in the vertical direction and are spaced apart in the width direction of the cover 16. The guide rails 23 and 24 are attached to the inner surface 16a of the cover 16. The guide rails 23 and 24 sandwich the dust-proof plates 21 and 22 from both sides in their width directions.

[0027] The guide rails 23 and 24 include a first guide rail 23 that sandwiches the first dust-proof plate 21 and a second guide rail 24 that sandwiches the second dust-proof plate 22. The first guide rail 23 and the second guide rail 24 are attached to the inner surface 16a of the cover 16 in a state of being overlapped with each other along the flow direction of the outside air at the ventilation port 17. The first guide rail 23 is disposed on the cover 16 side, and the second guide rail 24 is disposed on the machine room 15 side. As shown in FIG. 5, the vertical length of the first guide rail 23 is longer than the vertical length of the second guide rail 24. The lower end portion of the first guide rail 23 is disposed below the lower end portion of the second guide rail 24.

[0028] The rollers 25 and 26 are members for winding up the dust-proof plates 21 and 22 sandwiched by the guide rails 23 and 24. The rollers 25 and 26 are constituted by a cylindrical body or a cylindrical tube that is longer than the width dimension of the dust-proof plates 21 and 22 and shorter than the width dimension of the inner surface 16a of the cover 16. As shown in FIG. 4, the rollers 25 and 26 are arranged along the width direction of the cover 16 and are attached to the inner surface 16a of the cover 16. The rollers 25 and 26 are attached below the guide rails 23 and 24. The rollers 25 and 26 are disposed closer to the machine room 15 side than the guide rails 23 and 24. The outer peripheral surfaces of the rollers 25 and 26 are connected to the lower end portions of the dust-proof plates 21 and 22. The rollers 25 and 26 are supported so as to be rotatable about the axes of the rollers 25 and 26. By rotating, the rollers 25 and 26 wind up the dust-proof plates 21 and 22 sandwiched by the guide rails 23 and 24, or pay out the wound-up dust-proof plates 21 and 22 to the guide rails 23 and 24.

[0029] The rollers 25 and 26 include a first roller 25 that winds up the first dust-proof plate 21 and a second roller 26 that winds up the second dust-proof plate 22. The first roller 25 is disposed below the second roller 26. The first roller 25 is disposed closer to the cover 16 than the second roller 26.

[0030] The motors 29 and 30 are devices that rotate the rollers 25 and 26. The motors 29 and 30 are attached to the inner surface 16a of the cover 16. The motors 29 and 30 rotate the rollers 25 and 26 in the direction in which the dust-proof plates 21 and 22 held between the guide rails 23 and 24 are wound around the rollers 25 and 26 (hereinafter also referred to as the "winding direction"). The motors 29 and 30 rotate the rollers 25 and 26 in the direction in which the dust-proof plates 21 and 22 wound around the rollers 25 and 26 are fed out to the guide rails 23 and 24 (hereinafter also referred to as the "feeding direction"). In FIG. 5, the winding direction is counterclockwise and the feeding direction is clockwise.

[0031] The motors 29 and 30 include a first motor 29 that rotates the first roller 25 and a second motor 30 that rotates the second roller 26. The output shaft of the first motor 29 is connected to one end of the first roller 25. The output shaft of the second motor 30 is connected to one end of the second roller 26. The first motor 29 is disposed below the second motor 30. The first motor 29 is disposed closer to the cover 16 than the second motor 30.

[0032] The brushes 27 and 28 are members that clean the dust-proof plates 21 and 22. The brushes 27 and 28 contact the dust-proof plates 21 and 22 wound around the rollers 25 and 26. The brushes 27 and 28 sweep the dust-proof plates 21 and 22 by the winding of the rollers 25 and 26. The brushes 27 and 28 are disposed along the width direction of the cover 16 and are attached to a receiving plate 31 attached to the inner surface 16a of the cover 16. That is, the brushes 27 and 28 are attached to the inner surface 16a of the cover 16 via the receiving plate 31. The brushes 27 and 28 are disposed closer to the machine room 15 than the rollers 25 and 26 as shown in FIG. 5.

[0033] As shown in FIGS. 5 and 6, the brushes 27 and 28 are composed of hair portions 27a and 28a extending along the rollers 25 and 26, and base portions 27b and 28b to which the hair portions 27a and 28a are attached. The hair portions 27a and 28a extend from the base portions 27b and 28b toward the rollers 25 and 26. The hair portions 27a and 28a are in contact with the rollers 25 and 26 when the dust-proof plates 21 and 22 are not wound around the rollers 25 and 26. When the rollers 25 and 26 rotate in the winding direction, the hair portions 27a and 28a contact the dust-proof plates 21 and 22 and sweep the dust-proof plates 21 and 22.

[0034] As shown in FIG. 6, the base portions 27b and 28b of the brushes 27 and 28 are fixed to the surface 31a on the cover 16 side of the receiving plate 31. Spaces 27c and 28c penetrating in the vertical direction are formed in the base portions 27b and 28b.

[0035] The brushes 27 and 28 include a first brush 27 that contacts the first dust-proof plate 21 wound around the first roller 25, and a second brush 28 that contacts the second dust-proof plate 22 wound around the second roller 26. The first brush 27 is disposed below the second brush 28. The first brush 27 is disposed closer to the cover 16 than the second brush 28. The space 27c formed in the base portion 27b of the first brush 27 allows the dust that has been swept by the second brush 28 and fallen from the second dust-proof plate 22 to pass downward.

[0036] As shown in FIGS. 4 and 5, the receiving plate 31 is a plate that covers the dust-proof plates 21 and 22 wound around the rollers 25 and 26 from the machine room 15 side. The receiving plate 31 extends in the width direction and the vertical direction of the cover 16, and its upper portion 31b and lower portion 31c are formed by plates that bend toward the cover 16 side with respect to the intermediate portion 31d.

[0037] The receiving plate 31 is attached to motors 29 and 30 (not shown) that are attached to the inner surface 16a of the cover 16. That is, the receiving plate 31 is attached to the inner surface 16a of the cover 16 via the motors 29 and 30. The receiving plate 31 may be attached to the motors 29 and 30, for example, by a connection plate that connects the middle portion 31d of the receiving plate 31 and the housings of the motors 29 and 30.

[0038] As shown in FIG. 5, the upper portion 31b of the receiving plate 31 extends above the dust-proof plates 21 and 22 wound around the rollers 25 and 26. Specifically, the upper portion 31b of the receiving plate 31 extends above the second dust-proof plate 22 wound around the second roller 26. The upper portion 31b of the receiving plate 31 receives the dust that has been swept by the brushes 27 and 28 and scattered upward, and guides it to the middle portion 31d or the lower portion 31c of the receiving plate 31.

[0039] The lower portion 31c of the receiving plate 31 extends below the dust-proof plates 21 and 22 wound around the rollers 25 and 26. Specifically, the lower portion 31c of the receiving plate 31 extends below the first dust-proof plate 21 wound around the first roller 25. The lower portion 31c of the receiving plate 31 extends toward the through-hole 4a of the vehicle body frame 4 when the cover 16 is closed. The lower portion 31c of the receiving plate 31 guides the dust that has been swept by the brushes 27 and 28 and fallen to the through-hole 4a. The through-hole 4a of the vehicle body frame 4 is located below the brushes 27 and 28 and the receiving plate 31 when the cover 16 is closed. The lower end of the lower portion 31c of the receiving plate 31 is located on the cover 16 side (i.e., inside the through-hole 4a) of the edge of the through-hole 4a on the machine room 15 side when the cover 16 is closed. The through-hole 4a discharges the dust that has been swept by the brushes 27 and 28 and fallen outside the machine room 15 when the cover 16 is closed.

[0040] FIG. 7 is a diagram showing the electrical configuration of the dust-proof device 20 shown in FIG. 4.

[0041] The dustproof device 20 includes switches 32 to 34, a control device 35, sensors 36 and 37, and a notification device 38.

[0042] The switches 32 to 34 are switches that set the states of the dustproof plates 21 and 22 according to an input operation of a user such as an operator. The switches 32 to 34 are provided inside the cab 5. The switches 32 to 34 set the dustproof plates 21 and 22 to a use state and a storage state according to the input operation of the user. The switches 32 to 34 transmit a setting signal indicating the setting content corresponding to the input operation to the control device 35.

[0043] The use state is a state in which the dustproof plates 21 and 22 cover the ventilation openings 17 of the cover 16. That is, the use state is a state in which the dustproof plates 21 and 22 are extended to the guide rails 23 and 24. The storage state is a state in which the dustproof plates 21 and 22 do not cover the ventilation openings 17 of the cover 16. That is, the storage state is a state in which the dustproof plates 21 and 22 are wound around the rollers 25 and 26.

[0044] Specifically, as shown in FIG. 7, the switches 32 to 34 include a first switch 32 capable of setting the dustproof plates 21 and 22 to a first state, a second switch 33 capable of setting the dustproof plates 21 and 22 to a second state, and a third switch 34 capable of setting the dustproof plates 21 and 22 to a third state. The first state is the state of the dustproof plates 21 and 22 in which the first dustproof plate 21 is in the use state and the second dustproof plate 22 is in the storage state. The second state is the state of the dustproof plates 21 and 22 in which the first dustproof plate 21 is in the storage state and the second dustproof plate 22 is in the use state. The third state is the state of the dustproof plates 21 and 22 in which both the first dustproof plate 21 and the second dustproof plate 22 are in the use state.

[0045] By the input operation of the user, any one of the first switch 32, the second switch 33, and the third switch 34 is turned on. The turned-on switches 32 to 34 transmit a setting signal indicating any one of the first to third states corresponding to the turned-on switches 32 to 34 to the control device 35.

[0046] The control device 35 is a device that controls the motors 29 and 30 based on the states of the dust-proof plates 21 and 22 set by the switches 32 to 34. The control device 35 is composed of a computer including a CPU, a ROM, a RAM, and the like. The control device 35 may be composed of a part of the control device provided in advance in the construction machine 1.

[0047] When the dust-proof plates 21 and 22 are set to the stored state by the switches 32 to 34, the control device 35 controls the motors 29 and 30 so that the rollers 25 and 26 wind up the dust-proof plates 21 and 22. When the dust-proof plates 21 and 22 are set to the use state by the switches 32 to 34, the control device 35 controls the motors 29 and 30 so that the rollers 25 and 26 pay out the dust-proof plates 21 and 22.

[0048] Specifically, the control device 35 determines which of the first to third states the setting signal transmitted from the switches 32 to 34 indicates. When the setting signal transmitted from the switches 32 to 34 indicates the first state (when set to the first state by the switches 32 to 34), the control device 35 controls the first motor 29 so that the first roller 25 pays out the first dust-proof plate 21. At the same time, the control device 35 controls the second motor 30 so that the second roller 26 winds up the second dust-proof plate 22. In this case, the control device 35 transmits a control signal for rotating the first motor 29 in the payout direction to the first motor 29, and transmits a control signal for rotating the second motor 30 in the winding-up direction to the second motor 30.

[0049] When the setting signals transmitted from switches 32 to 34 indicate the second state (when switches 32 to 34 are set to the second state), the control device 35 controls the first motor 29 so that the first roller 25 winds up the first dust-proof plate 21. At the same time, the control device 35 controls the second motor 30 so that the second roller 26 feeds out the second dust-proof plate 22. In this case, the control device 35 transmits a control signal for rotating the first motor 29 in the winding-up direction to the first motor 29, and transmits a control signal for rotating the second motor 30 in the feeding-out direction to the second motor 30.

[0050] When the setting signals transmitted from switches 32 to 34 indicate the third state (when switches 32 to 34 are set to the third state), the control device 35 controls the first motor 29 so that the first roller 25 feeds out the first dust-proof plate 21. At the same time, the control device 35 controls the second motor 30 so that the second roller 26 feeds out the second dust-proof plate 22. In this case, the control device 35 transmits a control signal for rotating the first motor 29 in the feeding-out direction to the first motor 29, and transmits a control signal for rotating the second motor 30 in the feeding-out direction to the second motor 30.

[0051] Sensors 36 and 37 are sensors that detect whether the dust-proof plates 21 and 22 are in a use state. Sensors 36 and 37 are constituted by, for example, contact sensors that detect whether the upper ends of the dust-proof plates 21 and 22 have reached the upper ends of the guide rails 23 and 24.

[0052] Sensors 36 and 37 include a first sensor 36 that detects whether the first dust-proof plate 21 is in a use state, and a second sensor 37 that detects whether the second dust-proof plate 22 is in a use state. When the first sensor 36 detects that the first dust-proof plate 21 is in a use state, the first sensor 36 transmits a detection signal of the first dust-proof plate 21 to the control device 35. When the second sensor 37 detects that the second dust-proof plate 22 is in a use state, the second sensor 37 transmits a detection signal of the second dust-proof plate 22 to the control device 35.

[0053] When the control device 35 receives the setting signals transmitted from the switches 32 to 34 and does not receive any detection signals from the first sensor 36 and the second sensor 37 even though a predetermined time has elapsed, the control device 35 controls the notification device 38 so that an alarm is notified. Specifically, in this case, the control device 35 transmits a control signal instructing the notification of the alarm to the notification device 38.

[0054] Also, when the control device 35 does not receive any detection signals from the first sensor 36 and the second sensor 37 even though a predetermined time has elapsed since the operation device 6 started operating, the control device 35 controls the notification device 38 so that an alarm is notified. That is, during the operation of the operation device 6, when the first sensor 36 does not detect that the first dust-proof plate 21 is in a use state and the second sensor 37 does not detect that the second dust-proof plate 22 is in a use state, the control device 35 controls the notification device 38 so that an alarm is notified.

[0055] The notification device 38 is a device that issues an alarm regarding the states of the first dust-proof plate 21 and the second dust-proof plate 22. The notification device 38 is provided in the cab 5. The notification device 38 may be configured by, for example, at least one of a monitor and a speaker provided in advance in the cab 5. The notification device 38 causes the alarm to be displayed on the monitor or causes the alarm to be emitted from the speaker according to the control signal from the control device 35.

[0056] FIG. 8 is a flowchart showing the processing when the control device 35 shown in FIG. 7 controls the motors 29 and 30. The control device 35 performs the processing shown in FIG. 8 every time a predetermined control cycle elapses.

[0057] In step S1, the control device 35 determines whether the states of the dust-proof plates 21 and 22 are set by the switches 32 to 34. If the states of the dust-proof plates 21 and 22 are set by the switches 32 to 34, the control device 35 proceeds to step S2. If the states of the dust-proof plates 21 and 22 are not set by the switches 32 to 34, the control device 35 ends the processing shown in FIG. 8.

[0058] In step S2, the control device 35 determines whether the states of the dust-proof plates 21 and 22 set by the switches 32 to 34 are in the first state. If the states of the dust-proof plates 21 and 22 set by the switches 32 to 34 are in the first state, the control device 35 proceeds to step S3. If the states of the dust-proof plates 21 and 22 set by the switches 32 to 34 are not in the first state, the control device 35 proceeds to step S4.

[0059] In step S3, the control device 35 controls the first motor 29 so that the first roller 25 feeds out the first dust-proof plate 21. At the same time, the control device 35 controls the second motor 30 so that the second roller 26 winds up the second dust-proof plate 22. Thereafter, the control device 35 ends the process shown in FIG. 8.

[0060] In step S4, the control device 35 determines whether the states of the dust-proof plates 21 and 22 set by the switches 32 to 34 are in the second state. If the states of the dust-proof plates 21 and 22 set by the switches 32 to 34 are in the second state, the control device 35 proceeds to step S5. If the states of the dust-proof plates 21 and 22 set by the switches 32 to 34 are not in the second state, the control device 35 proceeds to step S6.

[0061] In step S5, the control device 35 controls the first motor 29 so that the first roller 25 winds up the first dust-proof plate 21. At the same time, the control device 35 controls the second motor 30 so that the second roller 26 feeds out the second dust-proof plate 22. Thereafter, the control device 35 ends the process shown in FIG. 8.

[0062] In step S6, the control device 35 determines whether the states of the dust-proof plates 21 and 22 set by the switches 32 to 34 are in the third state. If the states of the dust-proof plates 21 and 22 set by the switches 32 to 34 are in the third state, the control device 35 proceeds to step S7. If the states of the dust-proof plates 21 and 22 set by the switches 32 to 34 are not in the third state, the control device 35 ends the process shown in FIG. 8.

[0063] In step S7, the control device 35 controls the first motor 29 so that the first roller 25 feeds out the first dust-proof plate 21. At the same time, the control device 35 controls the second motor 30 so that the second roller 26 feeds out the second dust-proof plate 22. Then, the control device 35 ends the process shown in FIG. 8.

[0064] FIG. 9 is a flowchart showing the process when the control device 35 shown in FIG. 7 controls the notification device 38. The control device 35 performs the process shown in FIG. 9 every time a predetermined control cycle elapses.

[0065] In step S11, the control device 35 determines whether the working device 6 has started operating. If the working device 6 has started operating, the control device 35 proceeds to step S13. If the working device 6 has not started operating, the control device 35 proceeds to step S12.

[0066] In step S12, the control device 35 determines whether the states of the dust-proof plates 21 and 22 are set by the switches 32 to 34. If the states of the dust-proof plates 21 and 22 are set by the switches 32 to 34, the control device 35 proceeds to step S13. If the states of the dust-proof plates 21 and 22 are not set by the switches 32 to 34, the control device 35 ends the process shown in FIG. 9.

[0067] In step S13, the control device 35 determines whether the first dust-proof plate 21 is sensed by the first sensor 36 to be in a use state, or whether the second dust-proof plate 22 is sensed by the second sensor 37 to be in a use state. If the first sensor 36 senses that the first dust-proof plate 21 is in a use state, or if the second sensor 37 senses that the second dust-proof plate 22 is in a use state, the control device 35 ends the process shown in FIG. 9. If the first sensor 36 does not sense that the first dust-proof plate 21 is in a use state and the second sensor 37 does not sense that the second dust-proof plate 22 is in a use state, the control device 35 proceeds to step S14.

[0068] In step S14, the control device 35 determines whether a predetermined time has elapsed. If the predetermined time has elapsed, the control device 35 proceeds to step S15. If the predetermined time has not elapsed, the control device 35 returns to step S13.

[0069] In step S15, the control device 35 controls the notification device 38 to issue a warning. Then, the control device 35 ends the process shown in FIG. 9.

[0070] Note that when the states of the dust-proof plates 21 and 22 are set by the switches 32 to 34, the control device 35 may determine whether the states of the dust-proof plates 21 and 22 set by the switches 32 to 34 match the dust-proof plates 21 and 22 sensed by the sensors 36 and 37 to be in a use state. And if they do not match, the control device 35 may control the notification device 38 to issue a warning.

[0071] As described above, the construction machine 1 of the present embodiment includes a machine room 15 that houses heat exchangers 18 and 19 mounted on the vehicle body, a cover 16 that covers the machine room 15, and a dustproof device 20 that prevents dust from entering the heat exchangers 18 and 19. The cover 16 has a ventilation port 17 that allows outside air to flow inside the machine room 15. The dustproof device 20 includes dustproof plates 21 and 22 that can capture dust and are movably attached along the inner surface 16a of the cover 16 to cover the ventilation port 17, rollers 25 and 26 that wind up the dustproof plates 21 and 22, and brushes 27 and 28 that abut against the dustproof plates 21 and 22 wound around the rollers 25 and 26. The dustproof plates 21 and 22, the rollers 25 and 26, and the brushes 27 and 28 are attached to the inner surface 16a of the cover 16.

[0072] Thereby, the construction machine 1 can clean the dustproof plates 21 and 22 to which dust has adhered by the brushes 27 and 28 when the rollers 25 and 26 wind up the dustproof plates 21 and 22, so it is not necessary to remove the dustproof plates 21 and 22 when cleaning the dustproof plates 21 and 22. Further, when the cover 16 of the construction machine 1 is opened, the dustproof plates 21 and 22 are separated from the heat exchangers 18 and 19, so it is not necessary to remove the dustproof plates 21 and 22 when cleaning the heat exchangers 18 and 19. Therefore, according to the present embodiment, it is possible to suppress the man-hours required for cleaning the heat exchangers 18 and 19 or the dustproof plates 21 and 22 mounted on the construction machine 1.

[0073] Furthermore, in the construction machine 1 of the present embodiment, the vehicle body includes a vehicle body frame 4 that constitutes the floor surface of the machine room 15. The vehicle body frame 4 has a through hole 4a that penetrates the floor surface. The through hole 4a is located below the brushes 27 and 28.

[0074] As a result, the construction machine 1 can discharge the dust swept by the brushes 27, 28 and dropped outside the machine room 15. Since the construction machine 1 does not need to remove the dust dropped from the dust-proof plates 21, 22 during the cleaning of the dust-proof plates 21, 22, the man-hours for cleaning the dust-proof plates 21, 22 can be further reduced. Therefore, according to the present embodiment, the man-hours for cleaning the heat exchangers 18, 19 or the dust-proof plates 21, 22 mounted on the construction machine 1 can be further reduced.

[0075] Furthermore, in the construction machine 1 of the present embodiment, the dust-proof device 20 further includes a receiving plate 31 that covers the dust-proof plates 21, 22 wound around the rollers 25, 26 from the side of the machine room 15. The receiving plate 31 is attached to the inner surface 16a of the cover 16. The receiving plate 31 extends toward the through-hole 4a.

[0076] As a result, the construction machine 1 can guide the dust scattered or dropped from the dust-proof plates 21, 22 during the cleaning of the dust-proof plates 21, 22 to the through-hole 4a and smoothly discharge them outside the machine room 15 while suppressing the intrusion of the dust into the machine room 15 side. Therefore, the construction machine 1 can suppress the adhesion of dust to the heat exchangers 18, 19. As a result, the construction machine 1 can not only reduce the man-hours for cleaning the dust-proof plates 21, 22, but also reduce the man-hours for cleaning the heat exchangers 18, 19. Therefore, according to the present embodiment, the man-hours for cleaning the heat exchangers 18, 19 or the dust-proof plates 21, 22 mounted on the construction machine 1 can be further reduced.

[0077] Furthermore, in the construction machine 1 of the present embodiment, the dust-proof plates 21, 22 include a first dust-proof plate 21 formed with a plurality of openings and a second dust-proof plate 22 formed with a plurality of openings at an opening ratio different from that of the first dust-proof plate 21. The first dust-proof plate 21 and the second dust-proof plate 22 are attached in a stacked state.

[0078] As a result, the construction machine 1 can easily change the fineness of the dust-proof plates 21 and 22 to be used, such as selecting the fine dust-proof plates 21 and 22 at a work site with a large amount of dust, according to the environment of the work site. Therefore, the construction machine 1 can use dust-proof plates 21 and 22 that can prevent the intrusion of dust into the machine room 15 while ensuring the air permeability of the machine room 15, according to the environment of the work site. Thus, according to the present embodiment, it is possible to easily use dust-proof plates 21 and 22 suitable for the environment of the work site while suppressing the man-hours required for cleaning the heat exchangers 18 and 19 or the dust-proof plates 21 and 22 mounted on the construction machine 1.

[0079] Furthermore, in the construction machine 1 of the present embodiment, the dust-proof device 20 further includes motors 29 and 30 that are attached to the inner surface 16a of the cover 16 and rotate the rollers 25 and 26, switches 32 to 34 that set the states of the dust-proof plates 21 and 22 according to the input operation of the user, and a control device 35 that controls the motors 29 and 30 based on the states of the dust-proof plates 21 and 22 set by the switches 32 to 34. The switches 32 to 34 can set the states of the dust-proof plates 21 and 22 to a use state in which the dust-proof plates 21 and 22 cover the ventilation openings 17 and a storage state in which the dust-proof plates 21 and 22 do not cover the ventilation openings 17. When the control device 35 is set to the storage state by the switches 32 to 34, the control device 35 controls the motors 29 and 30 so that the rollers 25 and 26 wind up the dust-proof plates 21 and 22. When the control device 35 is set to the use state by the switches 32 to 34, the control device 35 controls the motors 29 and 30 so that the rollers 25 and 26 pay out the dust-proof plates 21 and 22.

[0080] As a result, the construction machine 1 can automatically clean the dust-proof plates 21 and 22 only by the user operating the switches 32 to 34, so that the man-hours required for cleaning the dust-proof plates 21 and 22 can be further suppressed. Thus, according to the present embodiment, the man-hours required for cleaning the heat exchangers 18 and 19 or the dust-proof plates 21 and 22 mounted on the construction machine 1 can be further suppressed.

[0081] Furthermore, in the construction machine 1 of the present embodiment, the switches 32 to 34 can set the states of the dust-proof plates 21 and 22 to a first state in which the first dust-proof plate 21 is in a use state and the second dust-proof plate 22 is in a stored state, a second state in which the first dust-proof plate 21 is in a stored state and the second dust-proof plate 22 is in a use state, and a third state in which both the first dust-proof plate 21 and the second dust-proof plate 22 are in use states. When set to the first state by the switches 32 to 34, the control device 35 controls the first motor 29 so that the first roller 25 feeds out the first dust-proof plate 21, and controls the second motor 30 so that the second roller 26 winds up the second dust-proof plate 22. When set to the second state by the switches 32 to 34, the control device 35 controls the first motor 29 so that the first roller 25 winds up the first dust-proof plate 21, and controls the second motor 30 so that the second roller 26 feeds out the second dust-proof plate 22. When set to the third state by the switches 32 to 34, the control device 35 controls the first motor 29 so that the first roller 25 feeds out the first dust-proof plate 21, and controls the second motor 30 so that the second roller 26 feeds out the second dust-proof plate 22.

[0082] Thereby, the construction machine 1 can use the dust-proof plates 21 and 22 suitable for the environment of the work site, and can automatically clean the dust-proof plates 21 and 22. Therefore, according to the present embodiment, while further suppressing the man-hours required for cleaning the heat exchangers 18 and 19 or the dust-proof plates 21 and 22 mounted on the construction machine 1, the dust-proof plates 21 and 22 suitable for the environment of the work site can be used more easily.

[0083] Furthermore, in the construction machine 1 of the present embodiment, the dustproof device 20 further includes a first sensor 36 that senses whether the first dustproof plate 21 is in a use state, a second sensor 37 that senses whether the second dustproof plate 22 is in a use state, and a notification device 38 that gives an alarm. When the working device 6 is in operation, the control device 35 controls the notification device 38 so that an alarm is notified when the first sensor 36 does not sense that the first dustproof plate 21 is in a use state and the second sensor 37 does not sense that the second dustproof plate 22 is in a use state.

[0084] Thereby, even if a situation occurs in which neither the first dustproof plate 21 nor the second dustproof plate 22 covers the ventilation port 17 due to some defect during the operation of the working device 6 of the construction machine 1, the construction machine 1 can notify the user to immediately deal with this situation. Therefore, the construction machine 1 can suppress the operation of the working device 6 with the heat exchangers 18 and 19 not being dustproofed, so that the man-hours for cleaning the heat exchangers 18 and 19 can be suppressed. Thus, according to the present embodiment, the man-hours for cleaning the heat exchangers 18 and 19 or the dustproof plates 21 and 22 mounted on the construction machine 1 can be further suppressed.

[0085] As described above, the embodiments of the present invention have been described in detail. However, the present invention is not limited to each embodiment, and various changes can be made without departing from the spirit of the present invention. The present invention can add the components of one embodiment to the components of another embodiment, replace the components of one embodiment with the components of another embodiment, or delete a part of the components of one embodiment.

Explanation of reference numerals

[0086] 1... Construction machinery, 2... Lower traveling body, 3... Upper slewing body (vehicle body), 4... Vehicle body frame, 4a... Through hole, 5... Cab, 6... Working device, 7... Boom, 8... Arm, 9... Bucket, 10... Boom cylinder, 11... Arm cylinder, 12... Bucket cylinder, 13... Blade, 14... Counterweight, 15... Machine room, 15a... Opening, 16... Cover, 16a... Inner surface, 17... Vent, 18... Radiator (heat exchanger), 19... Oil cooler (heat exchanger), 20... Dustproof device, 21... First dustproof plate (dustproof plate), 22... Second dustproof plate (dustproof plate), 23... First guide rail, 24... Second guide rail, 25... First roller (roller), 26... Second roller (roller), 27... First brush (brush), 27a... Bristle part, 27b... Base part, 27c... Space, 28... Second brush (brush), 28a... Bristle part, 28b... Base part, 28c... Space, 29... First motor (motor), 30... Second motor (motor), 31... Receiving plate, 31a... Surface, 31b... Upper part, 31c... Lower part, 31d... Middle part, 32... First switch (switch), 33... Second switch (switch), 34... Third switch (switch), 35... Control device, 36... First sensor, 37... Second sensor, 38... Notification device

Claims

1. A construction machine comprising a machine room for housing a heat exchanger mounted on a vehicle body, a cover for covering the machine room, and a dustproof device for preventing dust from entering the heat exchanger, wherein the cover has a ventilation opening for allowing outside air to flow inside the machine room, the dustproof device includes a dustproof plate that can capture the dust and is movably attached along the inner surface of the cover to cover the ventilation opening, a roller for winding up the dustproof plate, and a brush that abuts against the dustproof plate wound around the roller, the dustproof plate, the roller, and the brush are attached to the inner surface of the cover characterizing the construction machine.

2. The vehicle body includes a vehicle body frame that constitutes the floor surface of the machine room, the vehicle body frame has a through hole penetrating the floor surface, the through hole is located below the brush characterizing the construction machine according to Claim 1.

3. The dustproof device further includes a receiving plate that covers the dustproof plate wound around the roller from the machine room side, the receiving plate is attached to the inner surface of the cover and extends toward the through hole characterizing the construction machine according to Claim 2.

4. The dustproof plate includes a first dustproof plate formed with a plurality of apertures and a second dustproof plate formed with the plurality of apertures at an aperture ratio different from that of the first dustproof plate, the first dustproof plate and the second dustproof plate are attached in a stacked state characterizing the construction machine according to Claim 1.

5. The dustproof device further includes a motor attached to the inner surface of the cover for rotating the roller, a switch for setting the state of the dustproof plate according to a user's input operation, and a control device for controlling the motor based on the state of the dustproof plate set by the switch, the switch can set the state of the dustproof plate to a use state in which the dustproof plate covers the ventilation opening and a storage state in which the dustproof plate does not cover the ventilation opening, the control device when set to the storage state by the switch, controls the motor so that the roller winds up the dustproof plate, when set to the use state by the switch, controls the motor so that the roller pays out the dustproof plate characterizing the construction machine according to Claim 1.

6. The dust-proof plate includes a first dust-proof plate formed with a plurality of apertures, and a second dust-proof plate formed with the plurality of apertures at an aperture ratio different from that of the first dust-proof plate and attached in a state of being overlapped with the first dust-proof plate. The roller includes a first roller for winding up the first dust-proof plate and a second roller for winding up the second dust-proof plate. The brush includes a first brush that contacts the first dust-proof plate wound around the first roller and a second brush that contacts the second dust-proof plate wound around the second roller. The motor includes a first motor for rotating the first roller and a second motor for rotating the second roller. The switch can set the state of the dust-proof plate to a first state in which the first dust-proof plate is in the use state and the second dust-proof plate is in the storage state, a second state in which the first dust-proof plate is in the storage state and the second dust-proof plate is in the use state, and a third state in which both the first dust-proof plate and the second dust-proof plate are in the use state. The control device When set to the first state by the switch, controls the first motor so that the first roller feeds out the first dust-proof plate and controls the second motor so that the second roller winds up the second dust-proof plate. When set to the second state by the switch, controls the first motor so that the first roller winds up the first dust-proof plate and controls the second motor so that the second roller feeds out the second dust-proof plate. When set to the third state by the switch, controls the first motor so that the first roller feeds out the first dust-proof plate and controls the second motor so that the second roller feeds out the second dust-proof plate. The construction machine according to claim 5, characterized in that.

7. The dust-proof device further includes a first sensor for sensing whether the first dust-proof plate is in the use state, a second sensor for sensing whether the second dust-proof plate is in the use state, and a notification device for notifying an alarm. During operation of the working device mounted on the vehicle body, when the first dust-proof plate is not detected by the first sensor as being in the use state and the second dust-proof plate is not detected by the second sensor as being in the use state, the control device controls the notification device so that the warning is notified. The construction machine according to claim 6, characterized by the above.

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