Control panel for work machines

Abstract

To provide a technique capable of more surely absorbing vibrations of an inner case accompanying machine operation in a control panel of a work machine in which the inner case housing a control unit is fixed to an outer case.SOLUTION: A control panel of a work machine includes an outer case 2 and an inner case 3. Inside the outer case 2, in an upper region of the inner case 3, a beam 51 and a beam 52 are provided so as to extend in the machine front-rear direction while being spaced apart in the machine width direction. The beam 51 is arranged inside the machine relative to the machine width direction than the beam 52. A bracket 6 is fixed to the upper surface of the inner case 3 so as to separate the beams 51 and 52 from the beams 51 and 52 with a gap therebetween. Anti-vibration mounts 71A and 71B are provided between the bracket 6 and the beam 51, and anti-vibration mounts 72A and 72B are provided between the bracket 6 and the beam 52.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a control panel for a work machine, and more particularly to a control panel for a work machine in which an inner case housing a control unit is fixed to an outer case. [Background technology]

[0002] Some work machines, such as electric hydraulic excavators, are equipped with a control panel for controlling electric devices. For example, Patent Document 1 discloses an electric hydraulic excavator equipped with a control panel (13) that controls an electric motor (10) and various electric devices.

[0003] As shown in FIG. 5 of Patent Document 1, the control panel (13) is configured to include an outer case (20), an inner case (26) housed inside the outer case (20) via a spacer (30), and a control unit (28) housed inside the inner case (26). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-122496 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-mentioned Patent Document 1, the inner case (26) is fixed to the outer case (20) via the spacer (30). As a result, vibrations caused by the operation of the machine are directly transmitted to the inner case (26), and the control unit (28) housed in the inner case (26) may malfunction or be damaged.

[0006] In response to this, the inventors of the present application adopted a configuration in which the inner case is fixed to the outer case via a known anti-vibration mount capable of absorbing vibrations, instead of a spacer. In detail, the inventors of the present application adopted a configuration in which an anti-vibration mount is provided on the bottom surface of the inner case, and also on the side surface of the inner case, thereby absorbing as much vibration transmitted to the inner case as possible. However, in order to ensure access to the inner case during maintenance, it was not possible to provide an anti-vibration mount on the side surface of the inner case that faces the outside of the machine.

[0007] In the above configuration, when the work machine oscillates in the machine width direction, the vibration is absorbed by the anti-vibration mounts provided on the side surfaces of the inner case facing the inside of the machine. Since anti-vibration mounts have characteristics such as being strong against compressive loads but weak against tensile loads, if the inner case is pulled toward the outside of the machine, there is a risk that the anti-vibration mounts provided on the inner case surfaces facing the inside of the machine will be damaged. In that case, a problem occurs in that the vibrations transmitted to the inner case cannot be sufficiently absorbed.

[0008] Therefore, the present invention aims to provide a technology that can more reliably absorb vibrations of an inner case caused by machine operation in a control panel of a work machine in which an inner case housing a control unit is fixed to an outer case. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, the present invention provides a control panel for a work machine, which is installed on the side of the machine, comprising an outer case, an inner case fixed inside the outer case, and a control unit housed in the inner case, wherein inside the outer case, in the upper area of ​​the inner case, an inner beam and an outer beam are arranged so as to extend in the fore-and-aft direction of the machine while being spaced apart in the machine width direction, the inner beam is arranged more inward of the machine than the outer beam in terms of the machine width direction, a bracket is fixed to the upper surface of the inner case between the inner beam and the outer beam, separating the inner beam by a gap and separating the outer beam by a gap, an inner vibration-proof mount is provided between the bracket and the inner beam for fixing the bracket to the inner beam, and an outer vibration-proof mount is provided between the bracket and the outer beam for fixing the bracket to the outer beam.

[0010] Here, the bracket is composed of a plate member having a hat-shaped cross-section including a U-shaped portion and a flange portion, and it is preferable that at least one of the fixing bolts of the outer vibration-proof mount and the fixing bolts of the inner vibration-proof mount are positioned in the gap formed in the machine width direction by the presence of the U-shaped portion. Effect of the Invention

[0011] According to the present invention, when the work machine swings inwardly, the vibration of the inner case is absorbed by the inner vibration isolation mount, and when the work machine swings outwardly, the vibration of the inner case is absorbed by the outer vibration isolation mount. Therefore, the load is not concentrated on either the inner vibration isolation mount or the outer vibration isolation mount when the work machine swings in the machine width direction, and the risk of failure or damage can be reduced. As a result, in a control panel for a work machine in which an inner case housing a control unit is fixed to an outer case, it is possible to more reliably absorb the vibration of the inner case caused by the operation of the machine. [Brief description of the drawings]

[0012] [Figure 1] 1 is a side view showing an electric hydraulic excavator according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a view taken along the line II in FIG. [Diagram 3] 1A is a perspective view and FIG. 1B is a plan view showing a control panel installed behind the cab. [Figure 4] FIG. 4 is a vertical cross-sectional view taken along the line IV-IV in FIG. [Diagram 5] FIG. 4 is a perspective view of the outer case with a top plate and some side plates removed. [Figure 6] 4 is a perspective view showing an inner case fixed inside the outer case. FIG. [Figure 7] FIG. 4 is a perspective view showing a bracket provided on the upper surface of the inner case. [Figure 8] FIG. 13 is a perspective view showing the position of the bracket when attached to the inner case. [Figure 9] FIG. 4 is a perspective view showing a state in which the inner case is fixed to the outer case. [Figure 10] FIG. 10 is an enlarged view of the dashed area in FIG. [Figure 11] An enlarged view of the dashed area in Figure 4. [Figure 12] 13 is a conceptual diagram showing the positional relationship between a bracket and an anti-vibration mount according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] <1. Embodiment> A control panel for a work machine according to an embodiment of the present invention will be described with reference to Fig. 1 to Fig. 11. In the following, an electric hydraulic excavator 100 shown in Fig. 1 will be illustrated as an example of a work machine. Also, a control panel 1 mounted on the electric hydraulic excavator 100 will be illustrated as an example of the control panel.

[0014] The electric hydraulic excavator 100 is a work machine that uses an electric motor (not shown) to drive a hydraulic pump for operating various hydraulic devices. The electric motor is driven by electricity supplied from an external power source.

[0015] As shown in FIG. 2, the control panel 1 is installed behind the cab (operator's compartment) of the electric hydraulic excavator 100 (specifically, on the left side of the machine in the upper rotating body).

[0016] As shown in FIGS. 3(A) and (B), the control panel 1 is configured as a rectangular parallelepiped housing covered with a bottom plate, front, rear, left and right side plates, and a top plate.

[0017] As shown in FIG. 4, the control panel 1 is configured to include an outer case 2, an inner case 3 fixed to the outer case 2, and a control unit 4 housed in the inner case 3.

[0018] The control unit 4 is electrically connected to an electric motor and various electric devices (not shown) and appropriately controls each part.

[0019] Next, the outer case 2 will be described in detail with reference to Fig. 5. In Fig. 5, the bottom plate 21, the vertical pillars 23A, 23B, and 23C, the rear plate 25, etc. are shown, while the front plate, right plate, and top plate, etc. are intentionally removed to make the inside visible.

[0020] Four anti-vibration mounts 21A, 21B, 21C, and 21D are provided at the four corners of the upper surface of bottom plate 21. All of these four anti-vibration mounts 21A to 21D are fixing members for fixing the bottom side of inner case 3 to bottom plate 21 of outer case 2, and include anti-vibration rubber, fixing bolts, etc.

[0021] Two vertical pillars 23A, 23B arranged on the machine center line side (machine inner side) are provided to stand on the upper surface of the bottom plate 21 while being spaced apart in the machine front-rear direction. Two beams 51, 52 are fixed to the vertical pillars 23A, 23B. Specifically, as shown in Fig. 10 and Fig. 11, the two beams 51, 52 are provided in an upper region of the inner case 3 fixed inside the outer case 2 so as to extend in the machine front-rear direction while being spaced apart in the machine width direction.

[0022] As shown in FIG. 11, the beam 51 is formed of a member having a U-shaped cross section, and both front and rear ends are fixed to the vertical pillar members 23A and 23B with bolts.

[0023] The beam 52 is composed of a member having an L-shaped cross section including a vertical portion 521 and a horizontal portion 522. The vertical portion 521 of the beam 52 is fixed to a bracket 6 described below by vibration isolation mounts 72A, 72B described below. The horizontal portion 522 of the beam 52 extends from the upper end of the vertical portion 521 toward the machine center line side (inside the machine). The end of the horizontal portion 522 of the beam 52 on the machine center line side is fixed to the vertical pillar members 23A, 23B with bolts.

[0024] Beam 51 is disposed closer to the center line of the machine (on the inner side of the machine) than beam 52 in the machine width direction. In other words, beam 52 is disposed closer to the outer side of the machine (on the left side of the machine) than beam 51 in the machine width direction. Note that beam 51 is an example of an inner beam according to the present invention, and beam 52 is an example of an outer beam according to the present invention.

[0025] 5, beams 53 are provided on vertical pillars 23A and 23C so as to extend in the machine width direction (left-right direction). Anti-vibration mounts 53A and 53B equipped with anti-vibration rubber and fixing bolts are provided on beam 53. Anti-vibration mounts 53A and 53B are fixing members for fixing the front side of inner case 3 to beam 53.

[0026] Anti-vibration mounts 25A and 25B equipped with anti-vibration rubber and fixing bolts are provided on the inner surface of rear plate 25. Anti-vibration mounts 25A and 25B are fixing members for fixing the rear side of inner case 3 to rear plate 25.

[0027] Next, the inner case 3 will be described in detail with reference to Fig. 6. As shown in Fig. 6, the inner case 3 is configured as a box member having a rectangular parallelepiped shape.

[0028] Leg members 32A and 32B having a U-shaped cross section are provided on the underside of the inner case 3. The bottom side of the inner case 3 is fixed to the bottom plate 21 of the outer case 2 by attaching four vibration-proof mounts 21A to 21D (see FIG. 5) to the leg members 32A and 32B.

[0029] Mounting members 33A, 33B are provided on the right side of the upper surface 31 of the inner case 3 for mounting a bracket 6 (see FIG. 7) described later via vibration-proof mounts 71A, 71B (see FIG. 10 and FIG. 11) described later.

[0030] Further, on the front side of the upper surface 31 of the inner case 3, mounting members 35A, 35B are provided for mounting the inner case 3 to the beams 53 of the outer case 2 via vibration isolation mounts 53A, 53B (see FIG. 5).

[0031] Furthermore, on the rear side of the upper surface 31 of the inner case 3, mounting members 37A, 37B are provided for mounting the inner case 3 to the rear plate 25 of the outer case 2 via vibration isolation mounts 25A, 25B (see FIG. 5).

[0032] Next, the bracket 6 that is attached to the attachment members 33A, 33B provided on the upper surface 31 of the inner case 3 will be described in detail with reference to FIG.

[0033] As shown in FIG. 7, the bracket 6 is a bent plate member having a hat-shaped cross section including a U-shaped portion 61 and flange portions 62A and 62B.

[0034] The U-shaped portion 61 is a portion that protrudes toward the side of the mounting members 33A and 33B (the outside of the machine) in Fig. 6. A gap VD1 is formed inside the U-shaped portion 61. The U-shaped portion 61 has insertion holes in two locations for inserting right fixing bolts 72R of the vibration-proof mounts 72A and 72B described below.

[0035] Moreover, the flange portions 62A, 62B are provided on both longitudinal ends of the U-shaped portion 61. On the machine left side (outside the machine) of the flange portions 62A, 62B, gaps VD21, VD22 are formed due to the protrusion of the U-shaped portion 61. Moreover, the flange portions 62A, 62B are each formed with an insertion hole for inserting a left fixing bolt 71L of the vibration isolation mounts 71A, 71B described below.

[0036] 8, bracket 6 is installed on upper surface 31 of inner case 3 so that the surfaces of flange portions 62A, 62B facing the outside of the machine (machine left side) contact mounting members 33A, 33B, respectively. Bracket 6 is fixed to mounting members 33A, 33B by vibration isolation mounts 71A, 71B, which will be described later.

[0037] As shown in FIGS. 9 and 10, the bracket 6 is disposed between the beam 51 and the vertical portion 521 of the beam 52 with a gap between them and also with a gap between them and the vertical portion 521 of the beam 52.

[0038] Anti-vibration mounts 71A and 71B equipped with anti-vibration rubber and fixing bolts are provided between beam 51 and flange portions 62A and 62B of bracket 6. Anti-vibration mounts 71A and 71B fix bracket 6 to beam 51, thereby fixing inner case 3 to outer case 2. Anti-vibration mounts 71A and 71B are examples of inner anti-vibration mounts according to the present invention.

[0039] Each of the vibration-proof mounts 71A, 71B includes a right fixing bolt 71R extending to the right side of the machine (the side of the center line of the machine) and a left fixing bolt 71L extending to the left side of the machine. The right fixing bolt 71R is fixed by a nut while passing through the beam 51. The left fixing bolt 71L is fixed by a nut while passing through the flange portions 62A, 62B of the bracket 6. The left fixing bolt 71L, which passes through the flange portions 62A, 62B, is disposed in the above-mentioned gaps VD21, VD22 (see FIG. 7), respectively.

[0040] 10, two anti-vibration mounts 72A, 72B equipped with anti-vibration rubber and fixing bolts are provided between the beam 52 and the U-shaped portion 61 of the bracket 6. The anti-vibration mounts 72A, 72B fix the bracket 6 to the beam 52, thereby fixing the inner case 3 to the outer case 2. The anti-vibration mounts 72A, 72B are an example of an outer anti-vibration mount according to the present invention.

[0041] Each of the vibration-proof mounts 72A, 72B includes a right fixing bolt 72R extending to the right side of the machine (the side of the center line of the machine) and a left fixing bolt 72L extending to the left side of the machine. The right fixing bolt 72R is fixed by a nut while passing through the U-shaped portion 61 of the bracket 6. The right fixing bolt 72R that passes through the U-shaped portion 61 is disposed in the above-mentioned gap VD1 (see FIG. 7). The left fixing bolt 72L is fixed by a nut while passing through the vertical portion 521 of the beam 52.

[0042] 11, vibration isolation mount 72B is disposed above vibration isolation mount 71B. Although not shown, vibration isolation mount 72A on the front side of the machine is also disposed above vibration isolation mount 71A on the front side of the machine.

[0043] According to the embodiment described above, when the electric hydraulic excavator 100 swings inwardly of the machine (toward the center line of the machine), vibrations of the inner case 3 are absorbed by the vibration-proof mounts 71A and 71B shown in Fig. 10. Also, when the electric hydraulic excavator 100 swings outwardly of the machine (toward the left side of the machine), vibrations of the inner case 3 are absorbed by the vibration-proof mounts 72A and 72B shown in Fig. 10.

[0044] Therefore, the load is not concentrated on one of the anti-vibration mounts 71A, 71B or the anti-vibration mounts 72A, 72B when the electric hydraulic excavator 100 swings in the machine width direction, reducing the risk of failure or damage. As a result, in the control panel 1 of the electric hydraulic excavator 100 in which the inner case 3 housing the control unit 4 is fixed to the outer case 2, it is possible to more reliably absorb the vibration of the inner case 3 caused by the operation of the machine.

[0045] In the above-described embodiment, the bracket 6 has a hat-shaped cross section including the U-shaped portion 61 and the flange portions 62A, 62B. As a result, a gap VD1 (see FIG. 7) is formed inside the U-shaped portion 61, and gaps VD21, VD22 (see FIG. 7) are formed on the left side of the machine (outside the machine) of the flange portions 62A, 62B.

[0046] Therefore, it is possible to arrange right-side fixing bolt 72R of anti-vibration mounts 72A, 72B in gap VD1 (see FIG. 7), and to arrange left-side fixing bolt 71L of anti-vibration mounts 71A, 71B in gaps VD21, VD22 (see FIG. 7), respectively. As a result, compared to a configuration in which a bracket is made of a flat plate member without bending and anti-vibration mounts are arranged on both the left and right sides of the bracket, it is possible to arrange the bracket relatively compactly (space-saving) in the machine width direction, and it is possible to secure a large space for arranging equipment above inner case 3.

[0047] In the above-described embodiment, as shown in Fig. 6, leg members 32A, 32B are provided on the lower surface of the inner case 3, and vibration-proof mounts 21A-21D (see Fig. 5) are attached to the leg members 32A, 32B. Also, mounting members 35A, 35B are provided on the front side of the upper surface 31 of the inner case 3, and vibration-proof mounts 53A, 53B (see Fig. 5) are attached to the mounting members 35A, 35B. Furthermore, mounting members 37A, 37B are provided on the rear side of the upper surface 31 of the inner case 3, and vibration-proof mounts 25A, 25B (see Fig. 5) are attached to the mounting members 37A, 37B.

[0048] Therefore, in the process of fixing the inner case 3 to the outer case 2, it is not necessary to access the inside of the inner case 3, and the mounting process can be performed from the outside of the inner case 3.

[0049] <2. Modifications> The control panel for a work machine according to the present invention is not limited to the above-described embodiment, and various modifications and improvements are possible within the scope of the claims.

[0050] For example, in the above-described embodiment, as shown in FIG. 12(A), a case was illustrated in which the right-side fixing bolt 72R of anti-vibration mounts 72A, 72B is arranged in gap VD1, and the left-side fixing bolt 71L of anti-vibration mounts 71A, 71B is arranged in gaps VD21, VD22, respectively, but this is not limited to the above.

[0051] As shown in FIG. 12(B), the bracket 6 may be arranged symmetrically, with the left fixing bolt 71L of the anti-vibration mounts 71A, 71B being arranged in the gap VD1, and the right fixing bolt 72R of the anti-vibration mounts 72A, 72B being arranged in the gaps VD21, VD22, respectively.

[0052] In the above-described embodiment, the present invention is applied to a control panel mounted on an electric hydraulic excavator, but the present invention is not limited to this. The present invention may be applied to a control panel mounted on another work machine, for example, a hydraulic excavator equipped with an elevator cab. [Industrial Applicability]

[0053] As described above, the control panel for a work machine according to the present invention is suitable for mounting on, for example, an electric hydraulic excavator that generates driving force by an electric motor. [Explanation of symbols]

[0054] 1 Control panel 2 Outer case 3 Inner case 4. Control Unit 6 Bracket 21 Bottom plate 21A, 21B, 21C, 21D Anti-vibration mount 23A, 23B, 23C Vertical pillars 25 Back side plate 25A, 25B Anti-vibration mount 32A,32B Leg members 33A, 33B Mounting parts 35A, 35B mounting parts 37A, 37B Mounting parts 51,52,53 Beam 53A, 53B Anti-vibration mount 61 U-shaped section 62A, 62B flange 71A, 71B Anti-vibration mount 71L, 72L Left side fixing bolt 71R, 72R Right side fixing bolt 72A, 72B Anti-vibration mount 100 Electric hydraulic excavator 521 Vertical section 522 Horizontal part VD21,VD22 void

Claims

1. A control panel installed on a side of a work machine, An outer case, an inner case fixed inside the outer case; A control unit accommodated in the inner case; Equipped with An inner beam and an outer beam are provided inside the outer case in an upper region of the inner case so as to extend in a machine front-rear direction while being spaced apart from each other in the machine width direction, The inner beam is disposed on the inner side of the machine in the machine width direction relative to the outer beam, a bracket is fixed to an upper surface of the inner case between the inner beam and the outer beam, the bracket being disposed in a state of being spaced apart from the inner beam and spaced apart from the outer beam; an inner vibration isolating mount for fixing the bracket to the inner beam is provided between the bracket and the inner beam; A control panel for a work machine, comprising: an outer vibration isolation mount provided between the bracket and the outer beam for fixing the bracket to the outer beam.

2. The bracket is configured with a plate member having a hat-shaped cross section including a U-shaped portion and a flange portion, A control panel for a work machine as described in claim 1, characterized in that at least one of the fixing bolts of the outer vibration isolation mount and the fixing bolts of the inner vibration isolation mount are arranged in the gap formed in the machine width direction by the presence of the C-shaped portion.

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