JP3012877B2 - Blast hole notch forming apparatus and notch forming method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blast hole notch forming apparatus used for crushing residual iron, rocks, concrete, and the like in a blast furnace by a blasting method.

[0002]

2. Description of the Related Art Conventionally, in order to crush residual iron, rocks, concrete, and the like in a blast furnace, blast holes having a predetermined depth are formed at appropriate intervals in a portion to be crushed, and an explosive is charged in these blast holes. A blasting method has been adopted in which blasting is performed after each blast by loading and blasting. Furthermore, in such a blasting method, the direction of the crack from the blasting hole is uncertain, and efficient crushing cannot be expected. Therefore, when drilling the blasting hole with a piercing rod, a notch-forming blade is projected on the outer peripheral surface. In some cases, a notch is formed in the hole wall by the blade body at the same time as drilling, and a stress concentration is generated in the notch portion at the time of blasting to determine a crack direction. .

A technique relating to the formation of the notch in the blast hole is disclosed in Japanese Patent Application Laid-Open No. 53-125333. In this tunnel excavation method, first, after drilling a normal circular hole with a rock drill, high-pressure water is injected from a high-pressure nozzle having a pair of injection ports different in direction by 180 ° from each other. The trench is excavated by injection pressure.

Another conventional technique is disclosed in Japanese Patent Publication No. Sho 62-62.
No. 57792 discloses a bit for a grooved drilling hole. The grooved drill bit is composed of a front bit on which a rotational force and a striking force of a rod fixed to a rod tip of a rock drill are applied, and a front bit at a longitudinally rearward position of the rod of the front bit. It has a striking surface which is rotatably attached to the skirt or rod via a split bush and with the head of the front bit at a distance equal to or greater than the length of the split bush, and on which the striking force of the rod acts. At the same time, a pair of opposing protruding pieces with chips attached to the front end face are provided on the outer peripheral part, and a rear bit is formed in a wing-like shape. It is carried out.

[0005]

However, of the above-mentioned conventional techniques, in the notch forming method of the blasting hole disclosed in Japanese Patent Application Laid-Open No. 53-125333, after the work of piercing a circular hole, the groove is formed. Excavation work. That is, the drilling of the blast hole and the formation of the notch are performed by two independent operation steps, and there is a problem that the operation time becomes long. In addition, when excavating a groove, there is a problem that the positioning with respect to the circular hole is troublesome, it is troublesome, and the working time is further lengthened. Furthermore, since excavation is performed using high water pressure in a narrow work place, there is a problem that safety is lacking.

Further, in the drill bit with a groove shown in Japanese Patent Publication No. Sho 62-57792, since a blast hole is excavated by using an impact force, a material having high tensile strength such as pig iron is used. However, the impact force acts on the blade for forming the notch, and the blade may be damaged. In addition, since the outer diameter of the notch forming blade is fixed, the notch cannot be formed following the unevenness of the hole wall, and the notch cannot be formed in the concave portion.

An object of the present invention is to solve the above-mentioned problems of the prior art. It is an object of the present invention to perform hole excavation and notch processing in one step, and to improve the hole shape. Notch can be formed in a predetermined size even when the surface changes, and a notch can be formed even in a material having a large tensile strength such as pig iron because the impact force is not used. To provide a notch forming apparatus with a high level.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object. According to the first aspect of the present invention, there is provided a main body detachably attached to a rod end of a drilling machine, and a main body provided on the main body. A pair of notch-forming bits, each of which is opposed in the diametric direction of the blast hole and whose cutting edge toward the blast hole wall is able to protrude and retract from the main body, and causes the notch-forming bit to protrude from the main body toward the blast hole wall. A projecting means, and a drill for drilling attached to the tip of the main body, wherein the projecting means includes a flow path switching member provided in a cooling water flow path of the drill for drilling, and a cooling water switched by the flow path switching member. And an operating member that is operated by the pressure of (1).

According to the second aspect of the present invention, a main body removably attached to the rod tip of the drilling machine, and provided on the main body, respectively opposing each other in the diametrical direction of the blast hole,
The cutting edge toward the blast hole wall can come out of the main body,
A pair of notch forming bits urged by the urging means so as to be immersed in the main body, a projecting means for projecting the notch forming bit from the main body toward the blast hole wall, and attached to a tip of the main body. The projecting means comprises a flow path switching member provided in the cooling water flow path of the drilling drill, and an operating member operated by the pressure of the cooling water switched by the flow path switching member. .

[0010]

According to the third aspect of the present invention, a blasting hole is drilled by a drill for drilling attached to a rod end of a drilling machine,
When the drilling is completed up to the tip of the blasting hole, a pair of notches forming from the inside of the notch forming device body provided between the rod of the drilling machine and the drill for drilling are provided so as to face each other in the diameter direction of the blasting hole. The notch is formed on the blast hole wall while the bit is projected by the projecting means, and the drill and the notch forming device main body are pulled out from the blast hole.

According to the fourth aspect of the present invention, at the time of puncturing with a piercing drill, the notch forming bit is immersed in the notch forming device main body by the urging means, and the puncturing drill and the notch forming device are cut from the blasting hole. When the main body is pulled out, the notch forming bit is made to protrude from the inside of the notch forming device main body against the urging of the urging means by the protruding means to form a notch on the blast hole wall.

According to the sixth aspect of the present invention, when the drill for drilling and the body of the notch forming device are pulled out from the blast hole, the cooling water flow path is switched by the flow path switching member provided in the cooling water flow path of the drill for drilling, and the operation is performed. The pressure of the cooling water is applied to the member to cause the notch forming bit to protrude from the inside of the notch forming device to form a notch on the blast hole wall.

[0014]

Since the present invention has the above-described configuration, it operates as described below. According to the first and third aspects of the present invention, first, a blast hole is drilled by a drill for drilling attached to a rod tip of a drilling machine. Then, when the drilling is completed up to the tip of the blasting hole, a pair of notches provided in the notch forming device main body provided between the rod of the drilling machine and the drill for drilling so as to oppose each other in the diametrical direction of the blasting hole. The forming bit is protruded by the protruding means. In this state, a notch is formed in the blast hole wall while the drill for drilling and the body of the notch forming device are pulled out from the blast hole.

According to the second and fourth aspects of the present invention, when the blast hole is drilled by the drill, the notch forming bit is immersed in the notch forming apparatus main body by the urging means, and the notch forming bit is blasted. Do not interfere with hole drilling. When the drill for drilling and the body of the notch forming device are pulled out from the blasting hole, the notch forming bit is protruded from the inside of the notch forming device body against the urging of the urging means by the projecting means. A notch is formed at

According to the first, second and fifth aspects of the present invention, when the drill and the notch forming device main body are pulled out from the blast hole, the cooling water flow is provided by the flow path switching member provided in the cooling water flow path of the drill. The path is switched to apply the pressure of the cooling water to the operating member. Then, the notch forming bit projects from the notch forming device, and a notch can be formed on the blast hole wall.

Since the present invention operates as described above, when drilling a blast hole, drilling and notching can be performed in one step, and a predetermined size can be obtained even when the hole shape changes. Notch formation can be performed with
Furthermore, a highly safe blast hole notch forming apparatus can be provided.

[0018]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of a blast hole notch forming apparatus according to the present invention. FIG. 1 is a side view of a blast hole notch forming apparatus partially cut away to show the inside. FIG. 2 is a side view showing the inside of the notch forming device in a state where the notch forming bit is submerged in the main body. FIG. 3 is a view showing the inside of the notch forming device in a state where the notch forming bit protrudes from the main body. FIG. 4 is a sectional view of a blast hole excavated using a notch forming apparatus.

Blast hole notch forming apparatus 1 according to the present invention
Reference numeral 0 denotes a main body 30 detachably attached to the tip of a rod 20 of a drilling machine (not shown), as shown in FIG. A pair of notch forming bits 40 whose cutting edges toward the blast hole wall can protrude and retract from the main body 30, a channel switching member 60 provided in the cooling water channel 50, and the pressure of the cooling water switched by the channel switching member 60. The main components are an operating member 70 that operates and a drill 80 that is detachably attached to the tip of the main body 30.

At the tip of the rod 20 of the above-described drilling machine, a circular main body mounting recess 21 having a female screw is provided. Also, the base 31 of the main body 30 of the notch forming device 10
Is formed in a columnar shape so as to fit into the main body mounting concave portion 21, and a male screw is provided on the outer periphery. Therefore, the base 31 of the main body 30 of the notch forming device 10 is connected to the rod 2 of the drilling machine.
The notch forming device 10 is screwed into the body mounting recess 21 provided at the tip of
Can be attached. The notch forming device 10
By turning the base 31 of the main body 30 of the boring machine in the opposite direction to the mounting, the notch forming device 10
Can be removed.

The drill 80 comprises a conical portion 81 having a conical tip, and a mounting joint 82 to the notch forming device 10 extending from the base end of the conical portion 81. A circular drill mounting recess 32 having a female screw is provided at the tip of the main body 30 of the notch forming device 10. The base 83 of the mounting joint 82 has a columnar shape that fits into the drill mounting recess 32, and is provided with a male screw on the outer periphery. Therefore, by screwing the base 83 of the mounting joint 82 into the drill mounting recess 32 provided at the tip of the main body 30 of the notch forming device 10,
A drill 80 for drilling can be attached to the tip of the notch forming device 10. Also, the base 8 of the mounting joint 82
The drill 3 can be removed from the distal end of the main body 30 of the notch forming device 10 by turning the screw 3 in the opposite direction to the mounting.

The cooling water flow path 5 is provided inside the rod 20 of the drilling machine, the main body 30 of the notch forming device 10, and the mounting joint 82 and the conical portion 81 of the drill 80.
0 is provided for communication connection. In addition, a jet port 84 communicating with the cooling water channel 50 is provided on the side surface of the conical portion 81 of the drill. Further, a flow switching chamber 90 is provided in the cooling water flow path 50 in the main body 30 of the notch forming apparatus 10, and a flow switching member 60 is provided in the flow switching chamber 90.

A pair of opposing pressure chambers 100 extend from the flow path switching chamber 90 toward the outer periphery of the main body 30 of the notch forming apparatus 10. This pressure chamber 10
0 has a cylindrical shape, and inside the pressure chamber 100,
An operating member 70 is slidably fitted. The operating member 70 is a piston-like member that slides in the pressure chamber 100 and includes a disk 71 and a column portion 72 erected on the distal end side of the disk 71. Further, a spring 73 acting as an urging member is attached to the outer periphery of the cylindrical portion 72. Actuating member 7
0 is always urged toward the inside of the main body 30 of the notch forming device 10 by the urging of the spring 73 (FIG. 2). The flow path switching member 60 and the operating member 70 function as projecting means.

Notch forming bits 40 are respectively attached to the distal ends of the cylindrical portions 72 of the operating member 70 described above. The notch forming bit 40 is a cutter made of tungsten carbide or the like, and has a blade portion 41 formed toward the base end side of the main body 30 of the notch forming device 10, that is, toward the base end side of the drilling machine. Then, the blade portion 41 of the notch forming bit 40 is always immersed inside the notch forming device 10 (FIG. 2). In the above-described embodiment, the blade portion 41 is formed toward the base end side of the drilling machine. However, the direction of the blade portion 41 is opposite to this, that is,
It may be formed toward the tip side of the drill 80.
However, in this case, the notch forming direction is opposite to that of the above-described embodiment, and it is necessary to push the drill 80 for drilling in two steps of drilling and notch formation.

The above-mentioned channel switching member 60 comprises a mushroom-shaped stopper 61 and a support member 62 for supporting the stopper 61. The stopper 61 has a mushroom umbrella at the tip 611 and a shaft 61 at the base of the tip 611.
2 is extended. The support member 62 is connected to the flow path switching chamber 9.
0, a disk-shaped base 621 to be mounted in
A columnar supporting portion 6 erected on the front end side of the cooling water channel 50
22 and a sliding hole 62 provided on the distal end side of the support portion 622.
Consists of three. The base 621 has a through hole 624 for cooling water, and the cooling water can flow through the through hole 624. The stopper 6 is provided in the sliding hole 623 described above.
By inserting the first support portion 622, the stopper 61
Can be slidably supported. Stopper 6
A spring 613 is attached to the outer periphery of the first shaft portion 612, and always biases the stopper 61 toward the support member 62 (FIG. 2). In the above-described embodiment, the spring 613 is attached to the outer periphery of the shaft portion 612 of the stopper 61.
11 may be provided. In this case, the tip 611 of the stopper 61 is always moved by the spring 613 to the support 6.
It will be pressed toward 22 directions.

At the front end side in the above-mentioned flow path switching chamber 90,
A restricting portion 91 is provided with which the distal end portion 611 of the stopper 61 contacts. As described above, the stopper 61 is always
Because the spring 613 urges the support member 62 toward the support member 62, the distal end 611 of the stopper 61 is separated from the throttle 91, and the cooling water in the cooling water flow path 50 is removed by the drilling drill 8.
Injects into the blast hole from the ejection port 84 provided in the 0 conical part 81 (FIG. 2).

On the other hand, when the pressure of the cooling water flowing in the cooling water flow path 50 is increased, the distal end 611 of the stopper 61 is pressed toward the throttle portion 91 against the bias of the spring 613 by the pressure of the cooling water. The cooling water loses its outlet, and the pressure of the cooling water in the flow path switching chamber 90 increases. Therefore, the cooling water pressure in the pressure chamber 100 communicating with the flow path switching chamber 90 also increases, and the operating member 70 is pushed out in the outer peripheral direction of the main body 30 of the notch forming device 10 against the bias of the spring 73. Therefore, the notch forming bit 40 attached to the tip of the cylindrical portion 72 of the operating member 70 is attached to the main body 30 of the notch forming device 10.
From the outside (FIG. 3).

A method for drilling a blast hole and forming a notch using the blast hole notch forming apparatus 10 having the above configuration will be described.

First, a blast hole is drilled by a drill 80 attached to the tip of the rod 20 of the drilling machine. At this time,
The pressure of the cooling water flowing through the cooling water flow path 50 is
Is set to a pressure equal to or lower than the drag of the spring 613 attached to. Therefore, the distal end portion 611 of the stopper 61 is separated from the throttle portion 91, and the cooling water in the cooling water flow path 50 is discharged by the drill 80 for drilling.
From the ejection port 84 provided in the conical portion 81 of FIG. With this cooling water, the vicinity of the blast hole drilled by the drill 80 is cooled and chips are discharged.

The operating member 70 in the pressure chamber 100 is
The notch forming bit 40 urged toward the inside of the main body 30 of the notch forming device 10 and attached to the tip of the cylindrical portion 72 of the operating member 70 is immersed inside the main body 30 of the notch forming device 10. (FIG. 2). Therefore, the notch forming bit 40 does not hinder the drilling of the blast hole by the drill 80.

When the drilling is completed to the tip of the blast hole, the pressure of the cooling water flowing through the cooling water flow path 50 is increased while the drill 80 is positioned at the tip of the blast hole. Then, due to the pressure of the cooling water, the tip portion 61 of the stopper 61
1 is pressed against the restricting portion 91 against the bias of the spring 613, the cooling water loses its outlet, and the cooling water pressure in the flow path switching chamber 90 increases. Therefore, the pressure of the cooling water in the pressure chamber 100 communicating with the flow path switching chamber 90 also increases, and the spring 7
3 against the urging of the notch forming device 10
The notch forming bit 40 extruded in the outer peripheral direction of the main body 30 of FIG.
It protrudes outward from the main body 30 of the notch forming device 10 (FIG. 3).

In this state, the drill 80 for drilling from the blast hole
When the main body 30 of the notch forming device 10 is pulled out, the notch forming bit 40 forms a pair of opposing notches in the blast hole. In this way, blast holes and notches are formed in the residual iron and the like in the blast furnace. The notch shape formed in the blast hole will be described with reference to FIG.

The diameter (H) of the blast hole is determined by the drill 80 for drilling.
In the present embodiment, since the maximum diameter of the conical portion of the drill 80 is about 65 mm, the diameter (H) of the blast hole is also about 65 mm. Further, the bit formed by the notch forming bit 40 is determined by the size and the mounting position of the notch forming bit 40. In the present embodiment, the bit is formed to face the upper and lower sides of the blast hole, The width (d) of the base end is about 5 mm, and the depth (h) of the notch is about 2.5 mm.

[0034]

Since the present invention has the above-described structure,
The following effects can be obtained.

According to the first and third aspects of the present invention, the blast hole is pierced by the piercing drill, and the notch forming bit is protruded out of the notch forming device by the projecting means. A notch is formed in the blast hole wall while pulling out the apparatus body.

According to the second and fourth aspects of the present invention, when the puncturing hole is drilled by the drill, the notch forming bit is immersed in the notch forming apparatus main body by the urging means, and the notch forming bit is blasted. It does not interfere with hole drilling.

According to the first, second and fifth aspects of the present invention, when the drill and the notch forming device main body are pulled out from the blast hole, the cooling water flow is provided by the flow path switching member provided in the cooling water flow path of the drill. By switching the path, the pressure of the cooling water is applied to the operating member, and the notch forming bit is protruded from the notch forming device to form a notch on the blast hole wall.

Therefore, excavation of the blast hole and notch processing can be performed in one step, and at the time of notch processing, it is not necessary to align the position with respect to the blast hole, so that the work efficiency can be significantly improved. Further, even if the hole shape of the blast hole changes, the notch is formed by the notch forming bit following the hole shape, so that the notch can be formed with a predetermined size. Furthermore, since a striking force is not used, a notch can be formed even on a material having a large tensile strength such as pig iron without damaging the notch forming blade. In addition, safety is increased because high-pressure water is not used for excavation.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a notch forming apparatus according to the present invention.

FIG. 2 is an enlarged side view showing a state in which a notch forming bit is submerged in a main body in the notch forming device of FIG. 1;

FIG. 3 is an enlarged side view showing a state in which a notch forming bit protrudes from the inside of a main body in the notch forming device of FIG. 1;

FIG. 4 is a sectional view of a blast hole excavated by using a notch forming apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Notch forming apparatus 20 Rod of drilling machine 21 Body mounting recess 30 Main body 31 Base 32 Drill mounting recess 40 Notch forming bit 41 Blade 50 Cooling water flow channel 60 Flow switching member 61 Stopper 611 Tip 612 Shaft 613 Spring 62 Support Member 621 Base 622 Supporting part 623 Sliding hole 624 Through hole 70 Operating member 71 Disk 72 Column part 73 Spring 80 Drill for drilling 81 Conical part 82 Mounting joint 83 Base 84 Spout 90 90 Flow switching chamber 91 Restrictor 100 Pressure chamber

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsuo Sasaki 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Division (72) Inventor Tatsuhiro Furonaga Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka 2-2-2 No. 2 Okumura Gumi Co., Ltd. (72) Inventor Kenji Yoshikawa 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka, Osaka Prefecture 2-72 Okumura Guminai Co., Ltd. (72) Inventor Yoshihiko Endo Matsuzaki-cho, Abeno-ku, Osaka, Osaka 2-chome No. 2 No. 2 Okumura Gumi Co., Ltd. (56) References Japanese Utility Model Sho 58-38890 (JP, U) Japanese Utility Model Sho 54-102502 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , (DB name) E21C 37/04 E21B 10/26

Claims (5)

(57) [Claims] 1. A main body detachably attached to a rod end of a drilling machine, and a pair of main bodies provided on the main body, each of which is opposed to a blast hole in a diametrical direction and a cutting edge toward a blast hole wall can be protruded and retracted from the main body. A notch forming bit; a projecting means for projecting the notch forming bit from the main body toward the blast hole wall; and a drill for drilling attached to a tip of the main body, wherein the protruding means cools the drill for drilling. A notch forming device for a blast hole, comprising: a flow path switching member provided in a water flow path; and an operating member that is operated by the pressure of the cooling water switched by the flow path switching member. 2. A main body removably attached to a rod tip of a drilling machine, and a cutting edge provided on the main body, which is opposed to a blasting hole in a diametrical direction, and a cutting edge toward a blasting hole wall can protrude and retract from the main body. A pair of notch forming bits urged by the urging means so as to be immersed in the main body, projecting means for projecting the notch forming bit from the main body toward the blast hole wall, and a tip of the main body. A projecting means, the projecting means comprising: a flow path switching member provided in a cooling water flow path of the drilling drill; and an operating member operated by the pressure of the cooling water switched by the flow path switching member. A notch forming apparatus for a blast hole, comprising: 3. A notch forming device provided between the rod of the drilling machine and the drill for drilling when the blasting hole is drilled by the drill for drilling attached to the rod tip of the drilling machine and the drilling is completed up to the tip of the blasting hole. From the main body, a pair of notch forming bits provided so as to be opposed to each other in the diametrical direction of the blast hole are protruded by the protruding means. A method for forming a blast hole notch, comprising forming a notch. 4. The method for forming a notch in a blasting hole according to claim 3, wherein the notch forming bit is submerged in the notch forming apparatus main body by an urging means when the blasting hole is drilled by a drill. When the drill for drilling and the body of the notch forming device are pulled out, the notch forming bit is protruded from the inside of the notch forming device body against the urging of the urging means by the protruding means to form a notch on the blast hole wall. A method for forming a notch in a blasting hole. 5. A method for forming a notch in a blasting hole according to claim 3, wherein the drilling drill and the body of the notch forming device are provided in the cooling water flow path of the drilling drill when the notch forming device body is pulled out from the blasting hole. A blast hole characterized by switching a cooling water flow path by a switching member, applying a pressure of cooling water to an operating member, and projecting a notch forming bit from inside the notch forming device to form a notch in a blast hole wall. Notch forming method.