JP3013630U - Cable reel for electric excavator excavator - Google Patents

Abstract

(57) [Summary] [Purpose] To enable the use of a flat power supply cable that is difficult to wind because it is twisted or collapsed on a reel that rotates in a horizontal plane. A reel 4 that is provided with a rotation axis R parallel to a swing axis of an upper swing body at a rear portion of a lower traveling body of an electric excavator excavator equipped with an electric motor as a prime mover and rotates parallel to a swing surface of the upper swing body. And the flat type power supply cable 5 on the reel 4
To connect the flat type power supply cable 5 to the lower traveling body
A cable guide 6 that aligns in parallel with and a rotation stopper 3 that suppresses rotation of the reel are provided. The flat power supply cable 5 is aligned by the cable guide 6 in parallel with the rotation axis R, so that the flat power supply cable 5 is easily wound around the reel 4, and the rotation stopper 3 prevents looseness. Flat power cable 5
Compared with a cable with a round cross section, the external dimensions are about 60% at the same allowable current value, so a long cable can be wound with a small diameter reel.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cable reel structure for an electric excavator excavator.

[0002]

[Prior art]

 Generally, excavator excavators are hydraulically driven, and most of the prime movers of hydraulic pumps use internal combustion engines. However, when an internal combustion engine is used, exhaust gas and noise are generated greatly, and it is not preferable to use it especially in narrow underground work such as tunnel excavation. Therefore, it is desirable to use an electric excavator excavator that uses an electric motor as the prime mover of the hydraulic pump for underground work.

Conventionally, in an electric excavator excavator, an electric motor and a hydraulic pump are installed on an upper swing body, and a power supply cable is directly connected to the electric motor, so that the hydraulic pump drives a driving pressure to a lower traveling body. In order to supply oil, a hydraulic swing joint that connects a hydraulic circuit was provided between the upper swing body and the lower traveling body. However, if the power supply cable is connected directly to the upper revolving structure that rotates 360 °, the power revolving cable is swung around as the upper revolving structure revolves, which hinders excavation work. It is troublesome to process the power supply cable so as not to hinder driving. To prevent this, a cable reel may be provided on the lower traveling body side and a power supply cable may be connected to this cable reel.However, conventional cable reels that rotate in a vertical plane about a horizontal axis It is difficult to compactly arrange the upper revolving structure on the lower traveling structure so as not to hinder the swinging motion of the upper revolving structure, and providing the cable reel makes the lower traveling structure large.

Therefore, as a cable reel that can be compactly arranged on the lower traveling body so as not to hinder the revolving of the upper revolving structure, a rotary shaft parallel to the revolving shaft of the upper revolving structure is provided at the rear of the lower traveling structure. It has been proposed that a reel rotating parallel to the revolving surface of the upper revolving structure is pivotally supported by the rotating shaft between the lower traveling structure and the upper revolving structure, and a power feeding cable is connected to the reel.

[0005]

[Problems to be solved by the device]

 However, in such a reel that rotates in the horizontal plane, it is difficult to wind in multiple stages due to its structure, and a cable with a round cross section that is easy to wind is used as the power supply cable, so the cable length cannot be increased. There was a problem. The present invention solves the above problems in the cable reel of an electric excavator excavator. In a reel that normally rotates in a horizontal plane, a flat type power feeding cable that is twisted and collapsed and difficult to wind is used. It is an object of the present invention to provide a cable reel for an electric excavator excavator, which enables the cable length to be increased without increasing the reel diameter.

[0006]

[Means for Solving the Problems]

 In the present invention, in an electric excavator excavator equipped with an electric motor as a prime mover, a rotary shaft parallel to the swing axis of the upper revolving superstructure is provided at the rear part of the lower traveling superstructure, and an upper part is provided between the lower traveling superstructure and the upper revolving superstructure. A cable guide that pivots a reel that rotates parallel to the revolving surface of the revolving structure on the rotating shaft, connects a flat power supply cable to the reel, and aligns the flat power supply cable to the lower traveling structure in parallel with the rotation shaft. And the rotation stopper for suppressing the rotation of the reel solves the above-mentioned problem in the cable reel of the electric excavator excavator.

[0007]

[Action]

 Since the flat power feeding cable is aligned parallel to the rotation axis by the cable guide, it can be easily wound around the reel without twisting or falling, and the rotation stopper prevents looseness. Compared with a cable with a round cross section, a flat type power supply cable has an outer dimension of about 60% at the same allowable current value, so that the cable length can be increased without increasing the reel diameter.

[0008]

FIG. 1 is a plan view showing the arrangement of cable reels of an electric excavator excavator according to an embodiment of the present invention, FIG. 2 is a plan view of cable reels, and FIG. 3 is a side view of cable reels. 4 is a sectional view taken along the line AA of FIG. 3, FIG. 5 is a sectional view taken along the line BB of FIG. 3, FIG. 6 is a sectional view taken along the line CC of FIG. 3, and FIG.

In this embodiment, the electric excavator excavator 1 is provided with an upper swing body 12 on a lower traveling body 11, and an electric motor and a hydraulic pump (not shown) are installed on the upper swing body 12. ing. An excavation work device (not shown) including a shovel and a boom supporting the shovel is attached to a front portion of the upper swing body 12. The cable reel 2 is provided at the rear of the lower traveling body 11. The cable reel 2 is erected on the lower traveling body 11 so as to stand on a rotation axis R parallel to the revolving axis S of the upper revolving body 12, and between the upper revolving body 12 and the lower traveling body 11 a revolving surface of the upper revolving body 12 is provided. A reel 4 which rotates in parallel is pivotally supported by a rotation axis R, and a flat power supply cable 5 is connected to the reel 4 so that the flat plane 51 is parallel to the rotation axis R and is wound up. Further, the lower traveling body 11 is provided with a cable guide 6 and a rotation stopper 3.

The cable guide 6 is provided with three sets of guide rollers 61 and 62 for sandwiching the flat surface 51 and the side surface 52 of the flat type power feeding cable 5 respectively, and three sets are arranged in front and back while sequentially changing the angle. As shown in FIGS. 4 to 6, the flat surface 51 of the unwound flat power supply cable 5 which is parallel to the ground surface is oriented parallel to the rotation axis R during winding. Therefore, the reel can be easily wound up without twisting or falling.

The rotation stopper 3 is a bracket 31 to which an elastic plate 32 is attached, and the tip of the plate 32 contacts the reel 4 to prevent the reel 4 from rotating. Due to this action, the flat power feeding cable 5 in the reel 4 does not fall due to loosening. An electro-hydraulic swivel joint 13 is provided between the upper swing body 12 and the lower traveling body 11 on the same axis as the swing axis S of the upper swing body 12. Through this electrohydraulic swivel joint 13, the flat power supply cable 5 on the lower traveling body 11 side connected to the reel 4 is connected to the electric motor.

The flat power feeding cable 5 has an outer dimension of about 60% at the same allowable current value as compared with a cable having a round cross section. Therefore, the cable length is increased without increasing the diameter of the reel 4. be able to.

[0013]

[Effect of device]

 As described above, according to the present invention, in an electric excavator excavator, the cable reel can be compactly arranged on the undercarriage so as not to hinder the revolving of the upper revolving structure, and can rotate in the horizontal plane. It is possible to wind a flat type power supply cable, which is usually difficult to wind, onto the reel to be wound without twisting or falling down, so that the cable length can be lengthened without increasing the reel diameter, and the electric type The work efficiency of excavator excavators can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an arrangement of cable reels of an electric excavator excavator according to an embodiment of the present invention.

FIG. 2 is a plan view of a cable reel.

FIG. 3 is a side view of the cable reel.

4 is a cross-sectional view taken along the line AA of FIG.

5 is a sectional view taken along line BB of FIG.

6 is a cross-sectional view taken along the line CC of FIG.

FIG. 7 is an explanatory diagram of a stopper.

[Explanation of symbols]

 1 Electric excavator excavator 2 Cable reel 3 Rotation stopper 4 Reel 5 Flat power supply cable 6 Cable guide 11 Lower traveling body 12 Upper revolving body S Revolving axis R Rotating axis

Claims (1)

[Scope of utility model registration request] 1. An electric excavator excavator equipped with an electric motor as a prime mover, wherein a rotary shaft parallel to the swing axis of the upper swing body is provided at the rear portion of the lower runner, and between the lower runner and the upper swing body, A cable that pivotally supports a reel that rotates parallel to the revolving surface of the upper revolving structure with the rotating shaft, connects a flat power feeding cable to the reel, and orients the flat power feeding cable to the lower traveling structure in parallel with the rotating shaft. A cable reel for an electric excavator excavator, which is provided with a guide and a rotation stopper that suppresses rotation of the reel.