JP2677073B2 - Lubrication method for ground excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material which prevents wear of a ground excavator, has a small adverse effect on a living organism by a lubricating liquid contained in excavated earth and sand, and can be decomposed early to be rendered harmless. The present invention relates to a method for lubricating a ground excavator using a method.

[0002]

2. Description of the Related Art A chain cutter type ground excavator is known as a ground excavator for excavating soft rock such as Dotan formation. This excavator can excavate a narrow groove along the contour of the excavated ground by excavating with a chain cutter along the circumference of the planned excavation ground, and then by root cutting with a backhoe etc., it becomes relatively smooth. The exposed surface can be exposed.

In this type of excavator, the movable parts are easily worn because the cutter bit, the chain and the driving parts thereof contact the excavated earth and sand. Therefore, as a method of preventing this abrasion, conventionally, mineral lubricating oil is supplied to the contact portion, or a Teflon (registered trademark) coating is formed on the mechanical portion in advance and the movable portion is lubricated with water or the like, and the abrasion of the apparatus itself is prevented. I try to prevent it as much as possible.

[0004]

However, in the former method of supplying the mineral lubricating oil, since it mixes with the excavated earth and sand, when it is dumped in a river or the sea, it will be destroyed by living organisms. It adversely affects the environment and causes deterioration. On the other hand, the latter method of forming the Teflon coating on the surface of the mechanical portion is expensive and has a drawback that it is difficult to re-form after the coating is worn.

Therefore, at present, a lubricating material satisfying the following conditions is required in terms of lubricity, workability and post-treatment. Lubrication: Viscous, penetrative and easy to reach the lubrication destination. It is sticky and difficult to peel off. It must also be viscous and highly lubricious. Workability: Water-soluble and easy to supply. Do not let the equipment rust. Post-treatment: The lubricating liquid mixed in the discharged sediment should be harmless to seafood and humans. Less impact on aquatic plants.
It has good biodegradability in the soil and decomposes quickly to become mineralized.

The present invention has been made to solve the above problems, and has good lubricity and workability, has little adverse effect on the organisms of the lubricating liquid contained in the excavated earth and sand, and can be decomposed early. An object of the present invention is to provide a method for lubricating a ground excavator that is rendered harmless.

[0007]

In order to achieve the above-mentioned object, the present invention provides an excavation device having an excavation part that is endlessly rotationally driven and supplied into the soil. A lubricating liquid prepared by dissolving a water-soluble polymer material in water is supplied to the contacting parts of the constituent mechanical elements and their power transmission mechanisms.

The water-soluble polymer material in the present invention is composed of one or a mixture of CMC, polyacrylic acid and salts thereof, which is mixed with water in an amount of 0.2 to 0.5. It is desirable to use a lubricating liquid that is dissolved at a ratio of%.

[0009]

According to the above construction, the water-soluble polymer material used as the lubricating liquid dissolves in water to give viscous and sticky properties, and also becomes a highly viscous liquid. CM as a water-soluble polymer material that constitutes the lubricating liquid mixed in the discharged sand
When C, polyacrylic acid, or sodium polyacrylate-based material is selected, it decomposes early in the presence of microorganisms and metal ions in seawater, soil, and water.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. 1 and 2 show a chain cutter type ground excavator to which a lubrication method according to the present invention is applied. The chain cutter 1 is swingably and movably provided on a guide frame 3 having legs 2 at both ends. Has been. Leg 2
A hydraulic jack 2a is arranged on the ground to fix the guide frame 3 to the ground surface for each excavation work.

The chain cutter 1 includes a guide frame 3
A substantially triangular guide plate 6 swingably supported around a shaft 5a provided on a slide block 4 slidably supported on the shaft 5a on the side of the guide plate 6.
The driving sprocket 5 axially attached to the driven sprocket 5, the driven sprocket 8 and the driven sprocket (not shown) provided adjacent to the driving sprocket 5 and the sprocket are suspended between the sprockets and move endlessly along the outer peripheral shape of the guide plate 6. Chain 9
And a large number of excavating bits 10 provided on the outer periphery of the chain 9 and projecting from the outer periphery of the guide plate 6.

The shaft 5a is connected to an output shaft of a hydraulic drive motor 11 mounted on the slide block 4, and the drive of the hydraulic drive motor 11 causes the chain 9 to move endlessly in the direction of the arrow in the figure, so that the chain cutter 1 is moved. Cutting operation.

The guide plate 6 is a swinging hydraulic cylinder 1 supported by a slide block 4 via an arm 12a.
2 is driven to swing from a horizontal position indicated by an imaginary line with the shaft 5a as a base point, that is, from a work standby position to a substantially vertical position indicated by a solid line, that is, an excavation position, and the chain 9 moves to thereby make a natural ground. Excavate E in a narrow groove shape with a semi-circular locus.

The slide block 4 is connected to a hydraulic cylinder 14 for movement provided along the guide frame 3, and reciprocates the chain cutter 1 from the position shown by the solid line in the figure to the excavation end position shown by the imaginary line.

When one excavation work is completed, the chain cutter 1 returns to the work standby position again, and the guide frame 3
The guide frame 3 is moved to the next excavation position by raising the hydraulic jack 2a provided on the leg portion 2 of the vehicle, fixed on the ground surface by the hydraulic jack 2a, and then excavation work by the chain cutter is repeated. .

A lubricating liquid supply pipe 15 is arranged near the drive sprocket 5. Supply pipe 1
5 is connected to a lubricating liquid storage tank 16 installed on the ground surface via a lubricating liquid delivery pump 17. As the pump 17, for example, a diaphragm pump or a mohno pump is used.

Here, as the lubricating liquid, a polymer material composed of one kind selected from CMC, polyacrylic acid, sodium polyacrylate or a mixture thereof is added to water in an amount of 0.2 to 0.2%.
What was melt | dissolved in the ratio of 0.5% is used. Dissolved in this ratio has a viscosity of about several thousand cps, and it has a viscosity that can support a high load and is also viscous, so it has good permeability between soil particles in the soil and can move to movable parts. Is easy to reach. In particular, a material in which a polyacrylic resin polymer material is melted has adhesiveness such as pulling a thread, and is hard to be peeled off after being attached to the metal surface of the chain cutter 1, and keeps good lubricity. Since the liquid is neutral, the metal surface is prevented from being oxidized. In addition, the amount of soil mixed is 5 / 10,000 to 10/1 as a ratio to the volume of excavated sand.
With the compounding ratio of the polymer material of about 10,000, the same lubricity as that of the conventional lubricating oil is maintained. Therefore, the lubricity using the above polymeric materials is good, and the workability is also good.

Further, since the earth and sand excavated by the chain cutter 1 are mixed with the lubricating liquid and discharged to the surface of the earth without being muddyed, it is easy to dispose of the remaining soil and a large-scale processing device is required. Instead, it is reused for landfill.

Therefore, the influence of the mixed lubricating liquid on the natural environment is taken into consideration. However, the mixing ratio of the material with respect to the discharged earth and sand is low as described above, and the absolute amount thereof is small. When CMC having a low degree of etherification is used when CMC is selected, it is rapidly decomposed by microorganisms, forms a CMC metal salt by binding with polyvalent metal ions, and changes into a non-aqueous solution. In addition, the depolymerization is promoted by the promotion of depolymerization due to the dissolved oxygen in water, and it is mineralized early. In the case of polyacrylic acid and its salt, it is mineralized early by binding with polyvalent metal ions and decomposition by microorganisms as described above. Therefore, the polymer material mixed with the soil and discarded is easily decomposed naturally due to the presence of microorganisms and metal ions present in seawater, soil and water.

In order to accelerate the decomposition, calcium chloride, slaked lime, enzymes or the like may be mixed in the discharged earth and sand. In any case, these materials are recognized as food additives, and the raw materials themselves are completely harmless to humans and animals.

In this embodiment, the lubrication method according to the present invention is applied to the chain cutter type ground excavator, but it is needless to say that it can be applied to the lubrication method for other types of ground excavators.

Further, in this embodiment, the lubricating liquid storage tank 16 and the lubricating liquid delivery pump 17 are installed on the ground surface, but these are installed on the guide frame 3 of the ground excavator or the like. You may do it.

[0023]

As described above in detail with reference to the embodiments, in the method of lubricating a ground excavator according to the present invention, a water-soluble polymer material used as a lubricating liquid dissolves in water and becomes viscous, Since it becomes a liquid that is sticky and highly viscous, it has good lubrication and workability, and is suitable for preventing early wear of the machine and enhancing excavation efficiency.

Since CMC, polyacrylic acid, and sodium polyacrylate-based materials were selected as the water-soluble polymer materials that compose the lubricating liquid mixed in the discharged sediment, microorganisms and metals in seawater, soil and water were selected. Since it decomposes early in the presence of ions, is harmless to plants and animals and is highly safe, it can be effectively reused for dumping into the sea, landfill, etc.

[Brief description of the drawings]

FIG. 1 is a plan view of a chain cutter type ground excavator to which a lubrication method according to the present invention is applied.

FIG. 2 is a sectional view of the same.

[Explanation of symbols]

 1 Chain Cutter 5,8 Sprocket 9 Chain 10 Drill Bit 15 Lubricant Supply Pipe 16 Lubricant Storage Tank

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location C10M 145: 40)

Claims (2)

(57) [Claims] 1. An excavation device having an excavation part that is endlessly driven to rotate and supplied into the soil, wherein excavated earth and sand, a mechanical element constituting the excavation part, and a contact portion of a power transmission mechanism thereof are in contact with each other. A method for lubricating a ground excavator, comprising supplying a lubricating liquid prepared by dissolving a water-soluble polymer material in water. 2. The water-soluble polymer material is composed of one or a mixture of CMC, polyacrylic acid and salts thereof, which is added to water in an amount of 0.2 to 0.5.
The method for lubricating a ground excavator according to claim 1, characterized in that a lubricating liquid dissolved in a percentage is used.