JPS6124731A - Ripping method for bedrock - Google Patents

Abstract

PURPOSE:To improve ripping capacity, by a method wherein, when, during traction of a ripper point, a traction force exceeds a given value, an impact force is exerted on the ripper point. CONSTITUTION:A shank 6 is attached to a bulldozer A through a link 3, a cylinder 4, and a holder 5, and a ripper point 7 is attached to the forward end of a shank 6. An air feed pipe 12 is installed to the forward end of the ripper point 7, and impact device 8 is secured to the holder 5. A strain gauge 13 is sticked to the shank 6, and a traction force is deceived through detection of strain exerted on the shank 6. When the detecting value of the strain gauge 13 exceeds a specified value, the impact device 8 and an air feed pipe 7a are actuated, a hammering force is exerted on the shank 6, and the air is injected right before an impact force is exerted. Application of the impact force on the ripper point 7 causes improvement of ripping capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of ripping rock with a ripper device mounted on a bulldozer.

In the conventional technology, a puller is run, and the lymph point of the lymph device is penetrated into the rock to rip it.

In this rubbing method, the ripping capacity is mainly determined by the traction force of the bulldozer.

For example, a DI55-A bulldozer manufactured by Komatsu Ltd. is equipped with a ripper device, and basalt (compressive strength a c =
960k17cm", elastic wave velocity Vp=480φg
When the rock in C) was ripped, the traction force (''), vehicle speed (V), and track slip rate (
S), engine speed (M), and excavation depth T) were as shown in FIGS. 8 to 12.

From this, although the excavation depth is almost constant, it shows considerable variation depending on the traction force, vehicle speed, slip rate, engine speed, and rubbing situation (rock properties), but as the vehicle weight increases 'It is easy to understand that the ripping capacity can be increased by decreasing the slip rate and increasing the engine output to increase the traction force.

Problems to be Solved by the Invention However, if the vehicle weight is increased and the engine output is increased, the bulldozer becomes extremely large.

Measures and actions to solve the problem At the point when the traction force reaches its maximum or in the process of increasing the traction force, impact force is applied to the ripper point to increase the vehicle weight and reduce the engine output. This allows the ripping ability to be increased without increasing the size.

Embodiment FIG. 1 is a front view of a lymphatic device. A mounting plate 2 is fixed to a vehicle body 1 of a bulldozer A, and a holder 5 is attached to this mounting plate 2 via a link 3 and a cylinder 4 so as to be able to swing vertically. A shank 6 is attached to the holder 5, and a ripper point 7 is attached to the tip of the shank 6. An impact device 8 such as an air hammer is fixed to the holder 5, and the movable member 9 is attached to the holder 5. is facing Shank 6.

The ripper main door has a mounting recess 10 and a hole 11 that opens to the pointed end 7a, and this hole 1! A pipe 12 is fitted into the mounting recess 10, and the nozzle 12 is inserted into the gap between the corner 6a of the shank 6 and the mounting recess 10, and the corner 6.
extends upward through the gap between a and the protector I3,
It is connected to an air supply source (not shown).

A strain gauge 14 is attached to the shank 6 to detect the strain acting on the shank 6 and to sense the traction force.

In addition, in order to sense the traction force, the operating pressure of the cylinder 4,
The sensing may be performed by detecting the torque of the driving force.

The detected value of the strain gauge 14 is sent to the arithmetic control circuit 14, and when the strain reaches a certain level, the impact device 8 and the pipe 1
2 and the air supply source 15 to actuate the impact device 8 to apply impact force to the shank 6, and immediately before applying the impact force. Air is supplied to the pipe 12.

Because of this, since a striking force is applied to the ripper point 7, the ripping ability is significantly improved even if the traction force is the same. This state can be expressed in a table as shown in FIG. In Figure 6, ←) is the striking force.

Also, just before applying the striking power, the air is set to lymph point 7.
Since the powder is sprayed from the pointed end 7a to remove the compacted powder from the ripping surface, the ripping ability is further improved.

This state is shown in Fig. 7, where the portion (b) increases due to the removal of powder.

In addition, when applying striking power, dFII/lit is positive →
0, that is, when rtv/dt is negative → 0, is preferable, but it may be applied when the slip rate exceeds a certain level.

Effects of the invention Ripping ability can be improved without increasing vehicle weight or engine output.

[Brief explanation of the drawing]

FIG. 1 is a front view of a ripper device for carrying out the method of the present invention, and FIGS.
line, IV-1/line cross-sectional view, Figure 5: Control circuit diagram, Figures 6 and 7: Table showing ripping performance, Figures 8 to 12
The figure is a table showing traction force, single speed, slip rate, engine speed, and digging depth over time. 7 is lymph point.

Claims (1)

[Claims] In addition to penetrating Ritupa Point 7 into the bedrock and towing it,
A rock ripping method characterized in that a striking force is applied to a ripping point 7.