JPH03228993A - Pit of slit forming device - Google Patents

Abstract

PURPOSE:To prevent a generation of secondary breakage by providing chips for blocking to prevent the flowing-in of a boring powder, at the inner side from wedge chips provided at both ends of a pit main body. CONSTITUTION:Plural preceding round holes are engraved in a base rock. Then, the front side of a pit main body 1 is contacted between round holes, and swayed in the lateral directions while applying a shock to the main body 1. Then, while slits to contact the round holes each other are formed between the round holes, a boring powder is exhausted from boring powder discharging grooves 1a to the rear side, together with the water sprayed from spraying holes 1f. Furthermore, when wedge chips 4 provided at both ends of the main body 1 reach to the inside of the round hole, the flowing-in of the boring powder into the round holes is blocked by chips 3 for blocking provided between the wedge chips 4 and button chips 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bit for a slit forming device that forms slits in rock or concrete.

(Conventional technology) Conventional slit forming devices that form slits in bedrock or concrete in order to crush them include:
Bits as shown in FIGS. 8 and 9 are used.

The bit has button chips b planted in a staggered manner on the front surface of a flat bit body a.

On both ends of the bit body a, wedge tips C are implanted in a direction perpendicular to the longitudinal direction of the bit body a to improve the fit.

The bit is attached to the tip of the plate of the slit forming device to form slits in rock or the like in a 9-order manner.

In forming the slits, first, a plurality of preliminary round holes are drilled in the rock, etc., as shown in FIG. 10.

Then, a bit is brought into contact between these leading round holes e, and an impact is applied while being swung from side to side, thereby forming a slit f connecting between each leading round hole 〇, and during the slit formation. The generated chestnut flour is discharged together with the water spouted from the spout d.

(Problems to be Solved by the Invention) However, the conventional bit has wedge tips C provided at both ends of the bit body a.

When this wedge tip C reaches the position of the preceding round hole e as shown in FIG. There were problems such as the occurrence of secondary crushing, which reduced the excavation speed, and premature wear of chips b and c.

This invention has been made to improve the above-mentioned problems, and aims to provide a bit for a slit forming device that prevents the occurrence of secondary crushing by preventing the outflow of the flour.

(Means and Effects for Solving the Problems) In order to achieve the above object, the present invention provides button tips or wedge tips at intervals on the front surface of a flat bit body, and also provides button tips or wedge tips at both ends of the bit body. In a bit of a slit forming device in which a wedge tip is provided in a direction perpendicular to the longitudinal direction of the bit body, a blocking tip is provided inside the wedge tips provided at both ends of the bit body to prevent the outflow of machining powder. As a result, even if the wedge tip reaches the leading round hole during slit formation, the blocking tip prevents the outflow of the machining powder, thereby preventing secondary crushing from occurring. This is what we provide.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. 1 to 3.

In the figure, reference numeral 1 denotes a flat bit body, the front surface of which is formed into a gentle arc shape, and a plurality of button chips 2 are implanted in a staggered manner in the center of the front surface.

In addition, from the center where these button chips 2 are implanted to both ends, there are wedge-shaped closing chips 3 in a direction perpendicular to the longitudinal direction of the bit body 1, and wedge chips 3 in the same direction at both ends of the bit body 1. 4 are planted in each.

On the other hand, on both sides of the tip side of the bit body 1, there are hollowed paddy discharge grooves 1.
a are recessed at equal intervals in the longitudinal direction, and a recess 1b for attaching to the tip of a plate (not shown) of a slit forming device is provided on the rear surface of the bit body 1. A bottle hole IC is drilled slightly behind the section.

Further, passages 1d are bored on both sides of the recessed hole 1b.

These passages 1d communicate with a passage 1e formed along the upper side of the recessed hole 1b, and this passage 1e is opened between the button chip 2 in the center and between the closing chip 3 and the wedge chip 4, respectively. The water ejecting holes 1f communicate with each other, and the water supplied from one passage 1d is ejected from these ejecting holes 1f.

Next, the operation will be explained. When forming a slit in a rock or the like, first, a plurality of leading round holes 5 are bored in the rock or the like as shown in FIG. 4.

The front surface of the bit body 1 is brought into contact between these leading round holes 5, and the bit body 1 is swung by a stroke S in the left-right direction while applying an impact to the bit body 1.

As a result, a slit 6 is formed between each of the preceding round holes 5 to connect them.

The chestnut powder generated during the slit formation is discharged rearward from the chestnut rice discharge groove 1a together with the water jetted from the jetting hole 1f.

Furthermore, even if the wedge tips 4 provided at both ends of the bit body 1 reach the leading round hole 5 as shown in FIG. 5, the closing tip 3 provided between the wedge tip 4 and the button tip 2 Since the space between the areas is closed to prevent the sawdust from flowing out to the leading round hole 5 side, it is possible to prevent secondary crushing caused by the sawdust flowing out from the excavated surface.

Note that the spacing between the closing bits 3 is L = (0,5
By setting in the range of ~1.0)X(β-8),
This will prevent the leakage of chestnut flour.

Further, in the above embodiment, the closing tip 3 was provided between the button tip 2 and the wedge tip 4, but as shown in FIGS. 6 and 7, a plurality of wedge tips 4' are arranged equally in the longitudinal direction of the bit body 1. When provided at intervals, the outflow of the flour can be prevented within the range of L, and the same effect can be obtained.

(Effects of the Invention) As described in detail above, in this invention, since the occluding tip is provided inside the wedge tips provided on both ends of the bit body and parallel to the wedge tips, the wedge tip is removed during slit formation. Even if the cutting powder reaches the preceding round hole, the blocking chip prevents the cutting powder from flowing out along the excavated surface, so that secondary crushing can be prevented from occurring.

This can eliminate problems such as a slowdown in excavation speed and early chip wear.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view, FIG. 2 is a partially cutaway front view, FIG. 3 is a sectional view taken along line m-m in FIG. 2, and FIGS. The figure is an explanatory diagram of the operation, FIGS. 6 and 7 are explanatory diagrams showing other embodiments, and FIGS. 8 to 11 are explanatory diagrams of the conventional method. 1...Bit body 2...Button chip 3...
・Closing tip 4.4'...Wedge tip

Claims (1)

[Claims] A slit is formed in which button tips 2 or wedge tips 4' are provided at intervals on the front surface of a flat bit body 1, and wedge tips 4 are provided at both ends of the bit body 1 in a direction perpendicular to the longitudinal direction of the bit body 1. A bit for a slit forming device, which is provided with a closing tip 3 inside wedge tips 4 provided at both ends of a bit body 1 to prevent the outflow of flour.