Working machinery

Abstract

The objective is to provide a work machine that has a configuration that does not come into contact with high-voltage equipment located inside the machine room. [Solution] The work machine 10 comprises a lower traveling body 12 and an upper rotating body 14 provided on the lower traveling body 12 and having a machine room 22 in which high-voltage equipment is housed. The machine room 22 is characterized by comprising an exhaust port section 34 in which a plurality of exhaust holes 68 for discharging air are formed, and an intrusion prevention member 70 installed in the exhaust port section 34 so as to overlap the exhaust holes 68, preventing intrusion from contacting the high-voltage equipment from outside the machine room 22.

Description

Technical Field

[0001] The present invention relates to a working machine.

Background Art

[0002] Conventionally, working machines such as excavators include a self-propelled crawler-type lower traveling body and an upper body that is rotatably mounted on the lower traveling body. The upper body includes a prime mover having a heat engine or an electric motor, an exterior cover that covers the mounted equipment such as the prime mover, a cooling fan that supplies cooling air into the exterior cover, and a heat exchanger that cools a fluid by the cooling fan.

[0003] And, on the upstream side of the heat exchange device with respect to the direction in which the cooling air flows, a dust-proof filter that captures dust and the like mixed in the cooling air is detachably attached. This dust-proof filter needs to be regularly cleaned to remove the attached dust, and it is desirable that it can be easily maintained.

[0004] As a technology related to the present invention, for example, in Patent Document 1, in the machine room of a construction machine, cooling air is supplied to a heat exchange device in an exterior cover through an upper ventilation port and a lower ventilation port, and dust mixed in the cooling air is captured by a dust-proof filter provided on the upstream side of the heat exchange device.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] As described above, the machine room has vents to allow cooling air to flow through. However, in working machines where high-voltage equipment is located inside the machine room, such as electric excavators, there is a risk that a hand or a rod-shaped conductive member held in the hand may come into contact with the high-voltage equipment from outside the machine room through the vents.

[0007] The object of the present invention is to provide a work machine having a configuration that does not come into contact with high-voltage equipment located inside a machine room. [Means for solving the problem]

[0008] The work machine according to the present invention comprises a lower traveling body and an upper body provided on the lower traveling body and having a machine room for housing high-voltage equipment, wherein the machine room comprises an exhaust port section formed with a plurality of exhaust holes for discharging air, and an intrusion prevention member installed in the exhaust port section such that the intrusion prevention section overlaps the exhaust holes to prevent contact with the high-voltage equipment from outside the machine room.

[0009] Furthermore, in the work machine according to the present invention, it is preferable that the high-voltage equipment is installed on the exhaust port side, and that the intrusion prevention member is fastened to the exhaust port with a fastening member.

[0010] Furthermore, in the work machine according to the present invention, it is preferable that the intrusion prevention part has a mesh portion in which a plurality of holes smaller than the plurality of exhaust holes are formed.

[0011] Furthermore, in the work machine according to the present invention, it is preferable that the plurality of exhaust holes are arranged in alignment at predetermined intervals, the intrusion prevention member has a frame portion for supporting the mesh portion, and the frame portion has rib portions formed so as not to block the plurality of exhaust holes and to increase the rigidity of the intrusion prevention member. [Effects of the Invention]

[0012] According to the present invention, it is possible to prevent hands or rod-shaped conductive members held by hands from coming into contact with high-voltage equipment located inside the machine room of a work machine. [Brief explanation of the drawing]

[0013] [Figure 1] This figure shows a working machine according to an embodiment of the present invention. [Figure 2] This figure shows the configuration of the machine room of a work machine according to an embodiment of the present invention. [Figure 3] This figure shows the intake port portion of a work machine according to an embodiment of the present invention. [Figure 4] This figure shows the exhaust port portion of a work machine according to an embodiment of the present invention. [Figure 5] This figure shows a modified example of an intrusion prevention member for a work machine according to an embodiment of the present invention. [Modes for carrying out the invention]

[0014] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following, the same reference numerals will be used for similar elements in all drawings, and redundant explanations will be omitted. In addition, in the descriptions within the text, reference numerals previously mentioned will be used as necessary.

[0015] Figure 1 is a diagram showing a work machine 10 according to an embodiment of the present invention. Figure 1(a) is a side view of the work machine 10, and Figure 1(b) is a rear view of the work machine 10. Figure 2 is a diagram showing the configuration inside the machine room 22 of the work machine 10 according to an embodiment of the present invention. Figure 3 is a diagram showing the intake port 32 of the work machine 10 according to an embodiment of the present invention.

[0016] Figure 4 shows the exhaust port 34 of a work machine 10 according to an embodiment of the present invention. Figure 4(a) shows the exhaust port 34 of the work machine 10 with the intrusion prevention member 70 removed, Figure 4(b) shows the intrusion prevention member 70 of the work machine 10, and Figure 4(c) shows the exhaust port 34 of the work machine 10 with the intrusion prevention member 70 attached.

[0017] The work machine 10 is a machine used at civil engineering sites, construction sites, building demolition sites, industrial waste treatment sites, forestry sites, ship holds, farms, etc. Here, the work machine 10 will be described as an electric excavator, but other machines may also be used.

[0018] The work machine 10 includes a crawler-type lower traveling body 12 that can travel on its own, and an upper revolving body 14 that is mounted on the lower traveling body 12 so as to be able to revolve.

[0019] The lower traveling body 12 is provided with crawler traveling mechanisms composed of belts wound around drive wheels and driven wheels on the left and right, and each drive wheel is rotationally driven by a traveling motor (not shown).

[0020] The upper revolving body 14 includes an upper frame 16 that forms a support structure, an attachment 18, a cab 20, and a machine room 22. The upper frame 16 is horizontally revolved and driven with respect to the lower traveling body 12 by a revolving motor (not shown).

[0021] The attachment 18 is provided on the upper frame 16 and is disposed on the front side of the upper revolving body 14. The attachment 18 has a boom 27 rotatably attached to the upper frame 16, an arm 28 rotatably connected to the tip side of the boom 27, and a bucket 30 rotatably attached to the tip side of the arm 28.

[0022] The boom 27 rises and falls with respect to the upper revolving body 14 according to the extension and contraction of the boom cylinder. The arm 28 swings with respect to the boom 27 according to the extension and contraction of the arm cylinder provided between the arm 28 and the boom 27. The bucket 30 swings with respect to the arm 28 according to the extension and contraction of the bucket cylinder provided between the bucket 30 and the arm 28. Here, the boom cylinder, arm cylinder, bucket cylinder, traveling motor, and revolving motor are collectively referred to as the hydraulic actuator 44.

[0023] The cab 20 is located on the left front side of the upper frame 16. Here, the cab 20 is described as being located on the left front side, but it may also be located on the right front side. The cab 20 is equipped with a driver's seat for the operator to sit in in order to operate the work machine 10, a travel control device for operating the left and right drive wheels of the lower travel body 12, and a work control device for operating the attachment 18 and the swing motor.

[0024] The machine room 22 is surrounded by a machine room cover 33 made of a highly rigid material. The machine room 22 is equipped with an intake port 32 for taking in air from outside the machine room 22 and an exhaust port 34 for discharging air that has circulated inside the machine room 22.

[0025] The machine room 22 houses an electric motor control unit 40 that controls the rotational speed and torque generated by the electric motor 38, a battery 50, a cooling fan unit 52, a heat exchanger 39, and a dust filter 48. These components are covered by an intake-side panel having an intake port 32, an exhaust-side panel having an exhaust port 34, and a machine room cover 33.

[0026] When an operator operates the travel control device and the work control device inside the cab 20, the hydraulic control unit outputs an operation signal which is then sent to the hydraulic control valve 42, and the hydraulic control valve 42 controls the supply and discharge of hydraulic fluid to the hydraulic actuator 44 based on the control signal.

[0027] The hydraulic control valve 42 controls the supply and discharge of hydraulic fluid discharged from the hydraulic pump 36, which is driven by the electric motor 38, thereby driving the left and right drive wheels of the lower traveling body 12, rotating the upper slewing body 14, raising and lowering the boom 27, bending and extending the arm 28, and operating the bucket 30.

[0028] Inside the machine room 22, there is a cooling fan unit 52 that is operated by a motor (not shown) that is powered by a battery 50. When the cooling fan unit 52 is operated, outside air (air) is sent into the machine room 22 from the intake port 32, passes through the heat exchanger 39, and flows through the machine room 22 to the exhaust port 34.

[0029] The dust filter 48 is detachably attached to a filter mounting section located upstream of the cooling fan section 52. Dust mixed with the air taken in from the intake port section 32 by the operation of the cooling fan section 52 is captured by the dust filter 48. In this case, if a large amount of dust is captured by the dust filter 48, the airflow through the dust filter 48 will be insufficient, reducing the airflow through the heat exchanger 39 and thus degrading the cooling performance of the heat exchanger 39. For this reason, the dust filter 48 needs to be removed through periodic cleaning by opening the intake-side panel having the intake port section 32 and taking it out.

[0030] The air introduced into the machine room 22 flows downstream, absorbing heat as it comes into contact with the heat exchanger 39 flowing inside the cooling water of the heat-generating battery 50, motor control unit 40, and motor 38, as well as the hydraulic oil flowing inside the hydraulic pump 36, etc. The warmed air is then discharged to the outside through the exhaust port 34. This effectively cools the battery 50 and motor control unit 40, thereby suppressing a rise in the temperature of the battery 50 and motor control unit 40, etc.

[0031] The intake port portion 32 comprises a frame portion 60 having a curved portion that extends from the side to the rear of the machine room 22, a plurality of intake ports 62 formed by aligning a plurality of slits that are formed diagonally to take in air from outside the machine room 22, and ribs 64 formed to increase the rigidity of the intake side panel having the intake port portion 32.

[0032] The intake vent 32 is mounted on the machine room cover 33 so as to be openable and closable. Dust mixed with the air taken in from outside the machine room 22 when the cooling fan 52 is operating is captured by the dust filter 48. If a large amount of dust accumulates, the cooling performance of the heat exchanger 39 will decrease, so the user can periodically open the intake side panel having the intake vent 32 and clean the dust filter 48.

[0033] Thus, since users open the intake-side panel having the intake port 32 to perform periodic maintenance, there is a possibility of contact with high-voltage equipment such as the battery 50 and the motor control unit 40 if they are placed on the intake port 32 side. For this reason, it is preferable to place high-voltage equipment such as the battery 50 and the motor control unit 40 on the exhaust port 34 side.

[0034] The exhaust port section 34 is fixed to the machine room cover 33 by fastening it with fastening members such as bolts. The exhaust port section 34 comprises a frame section 66 having a substantially rectangular outer shape, a plurality of exhaust holes 68 formed by aligning a plurality of slits that are formed diagonally to discharge air from outside the machine room 22, and an intrusion prevention member 70. The plurality of exhaust holes 68 are divided into 11 exhaust hole groups 69, as shown in Figure 4(a).

[0035] Each exhaust port group 69 has a roughly rectangular shape, and in the example shown in Figure 4(a), ten exhaust ports 68 of the same length are arranged in a line, with shorter exhaust ports 68 located at the lower left and upper right ends. Between adjacent exhaust port groups 69, a frame is formed that extends from left to right across the exhaust port group 69.

[0036] The intrusion prevention member 70 comprises a mesh portion 72 and a frame portion 74. The mesh portion 72 is installed so as to overlap the multiple exhaust holes 68 of the exhaust hole portion 34 to prevent contact with high-voltage equipment from outside the machine room 22. As shown in Figure 4(c), the intrusion prevention member 70 is fastened to the exhaust hole portion 34 with fastening members such as bolts 71. This makes it difficult for users to easily remove it.

[0037] The mesh portion 72 has holes formed in a mesh pattern, with an opening area smaller than the opening area of ​​each exhaust hole 68 and smaller than the cross-sectional area of ​​the user's fingers or a rod-shaped conductive member grasped by the hand. As shown in Figure 4(c), the mesh portion 72 overlaps with multiple exhaust holes 68, preventing the conductive member grasped by the user's fingers or hand from passing through multiple exhaust holes 68.

[0038] The frame portion 74 is a member that supports the mesh portion 72. The frame portion 74 is formed so as not to block the multiple exhaust holes 68 and has rib portions 76 that increase the rigidity of the intrusion prevention member 70.

[0039] Specifically, the frame portion 74 has an outer peripheral frame 74a that covers the outer circumference of the overall shape of each exhaust port group 69, two frames 74b that are mounted on the outer peripheral frame 74a, and four rib portions 76 that cover the roughly triangular frame formed between the ends of the two frames 74b and the short exhaust ports 68 that extend diagonally at the corners of each exhaust port group 69. By forming these rib portions 76, the rigidity of the intrusion prevention member 70 can be increased without blocking the exhaust ports 68.

[0040] Next, the operation of the work machine 10 with the above configuration will be explained. The work machine 10, which functions as an electric shovel, is equipped with high-voltage equipment such as a battery 50 and an electric motor control unit 40, a heat exchanger 39 and a cooling fan unit 52 for cooling the heat generated from these devices, and a dust filter 48 provided upstream of the heat exchanger 39.

[0041] Furthermore, since the user of the work machine 10 periodically opens the intake side panel having the intake port 32 to perform regular maintenance, the battery 50, motor control unit 40, etc. are located on the exhaust port 34 side to prevent contact with high-voltage equipment.

[0042] An intrusion prevention member 70 is attached to the exhaust port section 34, which has multiple exhaust holes 68. As a result, the mesh section 72 is positioned to overlap the multiple exhaust holes 68, so that the exhaust port section 34 can discharge warm air flowing from the cooling fan section 52 and prevent the user's fingers or rod-shaped conductive members grasped by their hands from entering the machine room 22.

[0043] Figure 5 shows an intrusion prevention member 78, which is a modified example of the intrusion prevention member 70 of the work machine 10 according to an embodiment of the present invention. Unlike the intrusion prevention member 70, the intrusion prevention member 78 does not have a mesh portion 72 and, as shown in Figure 5, comprises an outer peripheral frame 80 and 11 frames 82 that are mounted on the outer peripheral frame 80 to block each exhaust hole 68. The presence of these frames 82 reduces the opening area of ​​the exhaust hole 38, thereby preventing the user's fingers or rod-shaped conductive members grasped by the hand from entering the machine room 22. [Explanation of Symbols]

[0044] 10 Working machine, 12 Lower traveling body, 14 Upper slewing body, 16 Upper frame, 18 Attachment, 20 Cab, 22 Machine room, 27 Boom, 28 Arm, 30 Bucket, 32 Intake vent, 33 Machine room cover, 34 Exhaust vent, 36 Hydraulic pump, 38 Electric motor, 39 Heat exchanger, 40 Electric motor control unit, 42 Hydraulic control valve, 44 Hydraulic actuator, 48 Dust filter, 50 Battery, 52 Cooling fan unit, 60 Frame unit, 62 Intake vent, 64 Rib, 66 Frame unit, 68 Exhaust vent, 69 Exhaust vent group, 70 Intrusion prevention member, 72 Mesh unit, 74 Frame unit, 74a Outer frame, 74b Frame, 76 Rib unit, 78 Intrusion prevention member, 80 Outer frame, 82 Frame.

Claims

1. Lower running body and An upper body provided on the lower traveling body, having a machine room that houses high-voltage equipment, Equipped with, The aforementioned machine room is An exhaust port section in which multiple exhaust holes are formed for discharging air, An intrusion prevention member is installed in the exhaust port portion such that it overlaps the exhaust port, preventing intrusion from outside the machine room to the high-voltage equipment, A work machine characterized by being equipped with the following features.

2. In the work machine described in claim 1, The high-voltage equipment is installed on the side of the exhaust port, The intrusion prevention member is fastened to the exhaust port portion with a fastening member, characterized in that the intrusion prevention member is fastened to the exhaust port portion.

3. In the work machine described in claim 1, The intrusion prevention part is characterized by having a mesh portion in which multiple holes smaller than the multiple exhaust holes are formed.

4. In the work machine described in claim 3, The aforementioned plurality of exhaust holes are arranged in a line with predetermined intervals between them. The intrusion prevention member has a frame portion for supporting the mesh portion, The work machine is characterized in that the frame portion has rib portions formed so as not to block the plurality of exhaust holes and to increase the rigidity of the intrusion prevention member.

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