JP2000085617A - Antifreezing device for track frame for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent freezing even in a work in a cold area using heat of oil passing through hydraulic oil piping along the lower surface of the upper plate of a track frame. SOLUTION: Heat of oil from a hydraulic power unit is added to the upper plate of a track frame 2, and hydraulic oil piping 12 for heating is provided in addition to the hydraulic oil piping to a running motor. The hydraulic oil piping 12 for heating is provided longitudinal direction of a side frame 2b through center joint 1a of a turning device 1 and a center frame 2a. The hydraulic oil piping 12 for heating is abutted to the lower surface of the upper plate 14 of the center frame 2a and the side frame 2b and is fixed to the lower surface of the upper plate 14 by a fixture. By providing the hydraulic oil piping 12 for passing the oil along the lower surface of the upper plate 14 of the track frame 2, heat existing in the oil is transmitted to the upper plate 14. Thus, freezing of soil on the track frame 2 can be prevented even in a work in a cold area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing freezing of soil on a track frame of a construction machine such as a hydraulic shovel during work.

[0002]

2. Description of the Related Art FIG. 4 is a diagram showing hydraulic piping in a traveling body of a conventional hydraulic shovel. As shown in the figure, a track frame 2 is formed by providing side frames 2b on both sides of a center frame 2a on which the turning device 1 is installed, and in a hydraulic shovel in which a crawler belt 3 is attached to the side frames 2b, the end of the side frames 2b A hydraulic pipe 5 for supplying hydraulic oil to a traveling motor 4 attached to the section is provided so as to crawl along the bottom in the track frame 2.

[0003]

According to such a conventional construction machine such as a hydraulic excavator, when working in a cold region, the soil accumulated between the crawler belt 3 and the track frame 2 due to the work freezes, Problems such as the inability to remove the mud or the trouble of removing the mud have occurred.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an apparatus for preventing freezing of a track frame of a construction machine which can prevent freezing between a crawler track and a track frame even in an operation in a cold region.

[0005]

According to the present invention, there is provided an apparatus for preventing freezing of a track frame of a construction machine, comprising: a construction machine having a track frame in which crawler tracks are attached to left and right side frames; A hydraulic pipe is mounted along the hydraulic pipe, and heat of oil passing through the hydraulic pipe prevents freezing of soil on the upper plate of the truck frame.

By arranging the hydraulic piping along the lower surface of the upper plate as described above, the heat of the oil is transmitted to the upper surface of the track frame, whereby the heat accumulated between the track frame and the crawler belt by the work. The soil can be prevented from freezing.

According to a second aspect of the present invention, in the first aspect, the hydraulic pipe provided along the lower surface of the upper plate of the track frame is a hydraulic pipe for supplying hydraulic oil to a traveling motor. There is a feature.

As described above, if the hydraulic piping for supplying the operating oil to the traveling motor is used for heating the upper plate of the truck frame, it is not necessary to provide a special hydraulic piping for heating.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A is a side view of a hydraulic shovel as an example of a construction machine to which the present invention is applied, and FIG.
Is a perspective view showing the arrangement of the hydraulic piping of the traveling body,
FIG. 2A is a cross-sectional view showing the arrangement of the hydraulic piping in the truck frame, FIG. 2B is a partially enlarged view thereof, FIG.
(B) is a figure which shows the example of a hydraulic circuit.

As shown in FIG. 1 (A), in the hydraulic excavator, a revolving unit 6 is installed on the track frame 2 via a revolving device 1, and an articulated front 7 and a driver's cab 8 are mounted on the revolving unit 6. In addition, a hydraulic power unit 9 including a hydraulic pump is mounted.

As shown in FIGS. 1A and 1B, the track frame 2 is formed by integrally welding side frames 2b to both ends of a center frame 2a on which a turning device 1 is installed. Each of the side frames 2b has a traveling motor 4, and the driving sprocket 1 driven by the traveling motor 4
The crawler belt 3 is wrapped around 0 and the driven sprocket 11.

In this embodiment, in order to apply heat of oil from the hydraulic power unit 9 to the upper plate of the track frame 2, a heating hydraulic pipe 12 is provided in addition to the hydraulic pipe 13 to the traveling motor 4. ing. The heating hydraulic pipe 12
Is provided in the longitudinal direction of the side frame 2b through the center frame 2a through the center joint 1a of the turning device 1.

As shown in FIG. 2, the center frame 2
a, the lower surface of the upper plate 14 of the side frame 2b is provided with the hydraulic pipe 12 for heating, and the upper plate is fixed by a fixture using, for example, U bolts 15 and nuts 16 (or brackets and bolts and nuts). The hydraulic pipe 12 is fixed to the lower surface of the pipe 14.

FIG. 3A shows an example of a hydraulic circuit of the heating hydraulic pipe 12. For example, a control valve 17 of the traveling motor 4 and a control valve (not shown) connected in cascade to the control valve 17 are neutral. The position, that is, the operating oil from the hydraulic pump 19 flows directly to the hydraulic piping 12 when the actuator operated by the traveling motor or other hydraulic pump 19 is not operating, and further, the return oil from the actuator even when the actuator is operating. Flow through the hydraulic pipe 12.

By providing the hydraulic piping 12 for flowing oil along the lower surface of the upper plate 14 of the track frame 2 as described above, the heat of the oil is transmitted to the upper plate 14,
The track frame 2 can be used even when working in cold regions.
The freezing of the upper soil can be prevented, and the soil removal operation after the operation can be easily performed.

FIG. 3B is a view showing another embodiment of the present invention together with the arrangement of the hydraulic piping 13. In this embodiment, a pair of hydraulic piping 13 connected to the traveling motor 4 is connected to the hydraulic piping. As shown in FIG. 12, it is mounted along the lower surface of the upper plate 14 of the side frame 2b or the center frame 2a. The center frame 2b is attached along its longitudinal direction. In this embodiment, the heat of the hydraulic piping 13 is transmitted to the upper plate 14 every time the vehicle travels, and the heat is applied to the upper plate 14 as described above, so that freezing of the soil can be prevented. In addition, since the hydraulic piping to the traveling motor 4 is used for heating the upper plate 14, there is no need to provide a special heating hydraulic piping, and economy can be achieved.

The present invention can be applied not only to a hydraulic excavator but also to other construction machines such as an applied machine using a hydraulic excavator as a base machine, a crane and its applied machine.

[0018]

According to the first aspect of the present invention, a hydraulic pipe is mounted along the lower surface of the upper plate of the truck frame, and the soil of the upper plate of the track frame is prevented from being frozen by the heat of the oil passing through the hydraulic pipe. Therefore, the soil on the track frame can be easily removed after the operation.

According to the second aspect, the hydraulic piping for supplying the hydraulic oil to the traveling motor is used for heating the upper plate of the truck frame, so that it is not necessary to provide a special hydraulic piping for heating, and it is economical. Can be achieved.

[Brief description of the drawings]

FIG. 1A is a side view showing an example of a hydraulic excavator to which the present invention is applied, and FIG. 1B is a perspective view showing an arrangement of hydraulic piping of the traveling body.

FIG. 2 is a cross-sectional view illustrating an example of a mounting structure of a heating hydraulic pipe according to the present invention.

FIGS. 3A and 3B are hydraulic circuits each showing a configuration of a heating hydraulic pipe according to the present invention.

FIG. 4 is a perspective view showing the arrangement of hydraulic piping of a traveling body in a conventional hydraulic shovel.

[Explanation of symbols]

1: turning device, 1a: center joint, 2: track frame, 2a: center frame, 2b: side frame, 3: crawler belt, 4: traveling motor, 10: driving sprocket, 11: driven sprocket, 12: for heating Hydraulic piping, 13: hydraulic piping connected to the traveling motor, 14: upper plate, 15: U bolt, 16: nut, 17: control valve

Claims (2)

[Claims] 1. A construction machine having a track frame in which crawler belts are attached to left and right side frames, wherein a hydraulic pipe is mounted along a lower surface of an upper plate of the track frame, and heat generated by oil passing through the hydraulic pipe is provided. An anti-freezing device for a truck frame of a construction machine, which prevents soil on a truck frame upper plate from freezing. 2. The freezing of a truck frame of a construction machine according to claim 1, wherein the hydraulic piping provided along the lower surface of the upper plate of the truck frame is a hydraulic piping for supplying hydraulic oil to a traveling motor. Prevention device.