JP2896487B2 - Repair equipment for tapping gutters, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repair device suitable for use in repairing a tapping gutter for guiding hot metal flowing out of a blast furnace taphole to another location.

[0002]

2. Description of the Related Art Hot metal flowing out of a blast furnace taphole is hot, so the inner surface of the tapping trough through which it flows is covered with a castable refractory material. Need to be repaired regularly. FIG. 7 shows a section of the tapping gutter T. A layer of the castable refractory material C is provided on the inner surface of the brickwork R. Although this refractory material layer is initially formed into an orderly sectional shape, it is eroded by use to form a concave eroded portion, and a degraded layer indicated by N is generated near the surface thereof.

[0003]

SUMMARY OF THE INVENTION
Waiting for the temperature of the gutter to drop, the operator removed the deteriorated layer with a breaker or the like and covered the repaired area with a new refractory material. Since the operation is performed in a poor working environment accompanied by vibration and the like, there is a problem in safety and health, and it is inefficient.

In order to improve this problem, a rock drilling machine equipped with a striking rotary crushing tool at the tip is held downward and is moved along the longitudinal direction of the gutter while swinging along the cross section of the gutter. In addition, a repairing method and a device for crushing and removing a deteriorated layer with a crushing tool which is given impact and rotation have been proposed (see JP-A-62-4808).

However, in this improved method,
Since a conventionally known rock drill is used as a hitting device for crushing, there are the following problems. That is, a conventional rock drill hits a shank rod with a piston operated by compressed air or hydraulic pressure, but in a state where a crushing hitting tool (bit) attached to the tip of the shank rod does not come into contact with a crushed object. When a hit is applied to the shank rod, a so-called idling state is caused, and members such as the piston and the shank rod are damaged. Therefore, the piston does not hit the shank rod in a state where it does not come into contact with such an object to be crushed. Like
A slight (several tens of mm) play is provided between the two.

FIG. 4 shows an example of a conventional hydraulic rock drill. When the bit B is in contact with the crushed object H, the piston P hits the rear end face of the shank rod S and an appropriate Although crushing is performed, as shown in FIG. 4, in a state where the bit B is not in contact with the crushed object H, that is, in a state where the rock drill is suspended, the piston P moves forward (down in the figure). Also does not reach the rear end of the shank rod S and does not hit the shank rod.

For this reason, if the object to be crushed has a high strength and has sufficient resistance to the bit, the bit and the shank rod are pushed up to perform a good crushing operation by impact and rotation. If the object is soft and the resistance is not enough, the shank rod and bit will fall by play allowance,
The impact force of the piston is not transmitted, and the crushing is performed only by rotation.

[0008] Since the deteriorated refractory material layer generally has low strength, the conventional apparatus often fails to perform good crushing for the above-mentioned reasons. In this case, when the rock drill is pressed downward to eliminate play and the impact force is applied, the bit is gradually pushed down and descends, so it is possible to translate the rock drill along the gutter No longer possible, making planned crushing difficult.

[0009]

In order to solve the above-mentioned problems, the present invention has the following configuration. In other words, the repair device according to the present invention is a tapping gutter provided with a rock drilling machine that hits a shank rod forward with a striking piston and strikes and crushes a crushed portion with a striking rotary tool attached to the tip of the shank rod. In such a repairing device, a hydraulic chamber provided with an accumulator for maintaining a predetermined hydraulic pressure is provided at the front of the rock drilling machine, and a lifting piston for pressing the shank rod backward by the hydraulic pressure of the hydraulic chamber is provided. It is characterized by:

[0010]

[Function] Since the shank rod is pushed backward by the lifting piston, there is no play between the striking piston and the shank rod even when the rock drill is hung vertically with the striking tool facing downward. The striking force is transmitted to the striking tool. For this reason, effective crushing is performed. When the striking piston strikes the shank rod, the lifting piston is pushed by the shank rod and moves forward (down in the figure), whereby a part of the hydraulic oil in the lifting hydraulic chamber escapes to the accumulator. And the pressure is maintained. When the striking piston retreats, pressure oil is again supplied from the accumulator to the lifting hydraulic chamber, and the lifting piston is pushed up to raise the shank rod to an appropriate striking position.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention shown in the drawings will be specifically described below. FIGS. 1 to 3 show one embodiment of the present invention. A modified rock drill 1 constituting a repairing apparatus is provided with a hitting cylinder 3 constituting a casing, and is provided inside thereof. A cylinder liner 4 is provided, in which a striking piston 5 is housed so as to be movable back and forth. The striking piston 5 is hollow, and a blow tube 7 is inserted into the hollow portion 6 from the rear end of the main body. The tip of the blow tube 7 is fitted into a hollow portion (blow hole) 10b of the shank rod 10. In the figure, 11 is a back head, 12 is a cylinder back liner, 13 is a cylinder front liner, and 15 is a valve.

An accumulator for striking is provided on the side of the cylinder 3.
Data 20, 20 'are provided. Accumulator 20
In (20 '), the hollow part 22 of the body 21 is partitioned by the diaphragm 23, the outside is a gas chamber 22a, and the inside is a hydraulic chamber 22b. When the pressure in the hydraulic chamber 22b increases, the gas in the gas chamber 22a is compressed, and the capacity of the hydraulic chamber increases. 24 is a cover, 25 is an accumulator valve, and 26 is a rubber cap.

Next, the operation of the hitting portion will be described based on a schematic diagram of the structure of the hitting portion. 8 to 11 are schematic views of the above-mentioned striking portion. In FIG. 8, the piston 5 has reached the top dead center, and the high-pressure oil HP acts on the piston rear chamber S1 from the high-pressure port D1. Since the pressure receiving area A1 of the piston rear chamber S1 is larger than the pressure receiving area A2 of the piston front chamber, the piston enters the impact stroke.

In FIG. 9, while the piston 5 continues its forward movement, the shortage of pressure oil is supplied from the accumulator 20 during this time. The large diameter portion 5a of the piston 5 opens the valve switching port D2, and the high pressure in the rear chamber of the piston passes to the rear chamber S2, and the valve 15 starts switching.

In FIG. 10, the piston 5 reaches the strike point and transmits the kinetic energy obtained during the stroke to the shank rod 10. At this point, the valve 15 has been switched, the high pressure port D1 is closed, the low pressure port D3 is opened, and the piston rear chamber communicates with the low pressure line LP. As the pressure in the piston rear chamber decreases, the force acting on the piston front becomes larger than the force acting on the piston rear, and the piston retreats. When the piston further advances from the impact point by idling, the piston closes the port D4 and the cushion chamber S
Form 3 and stop, then move back.

In FIG. 11, the piston 5 continues to retreat, and the valve 15 is pushed by the rear surface of the large-diameter portion 5a of the piston and retreats together. At this time, the oil in the rear chamber of the piston is low pressure port D
From 3, the oil in the rear chamber of the valve is removed from the groove D
After that, it is discharged to the low pressure line LP. During the piston retraction stroke, high-pressure oil is stored in the accumulator 20 and low-pressure oil is stored in the accumulator 20 '.

When the piston 5 continues to retract, the valve 15
Closes the low pressure port D3 and opens the high pressure port D1 at the same time, and the piston rear chamber communicates with the high pressure line HP. In the rear chamber of the piston with the low pressure port D3 closed, a cushion chamber is formed in the high pressure line with the inertial energy obtained during the retraction stroke of the piston, and the accumulated oil is stored in the accumulator 20. When the piston 5 reaches the top dead center where it stops due to the cushion, the switching of the valve 15 is also completed, and the state returns to the state of FIG. The blow is performed in this manner.

A rotating device is provided at the front of the hitting portion. The rotating device 30 has a driving gear 33 attached to the rotating shaft of a hydraulic motor 31, and the driving gear meshes with a gear 36 a of a chuck driver 36 via an idle gear 35. 32 is a gear box and 34 is a gear box cover.

A chuck bushing 37 is fitted into the chuck driver 36, and the shank rod 1 is fitted to the chuck bushing 37.
0 is slidably fitted at the rear. A chuck 40 is attached to the tip of the chuck driver 36, and spline portions 10a,... Provided in the middle of the shank rod 10 are engaged with the grooves of the chuck. Therefore, the shank rod 10 is rotated by the rotational force transmitted from the rotating device 30 via the chuck driver 36 and the chuck 40.

At the front end of the chuck end 42 provided at the front end of the gear box 32, a lifting cylinder 51 of a lifting device 50 is mounted. A lifting hydraulic chamber 52 is provided inside the lifting cylinder 51, and the hydraulic chamber 52 communicates with a lifting accumulator 53. The accumulator 53 has the same structure as the conventionally known accumulator 20, and maintains a constant oil pressure by expanding and compressing gas. Numeral 54 denotes a cap liner for closing the front end of the lifting cylinder 51.

A lifting piston 55 is provided inside the lifting cylinder 51 so as to be movable back and forth. The lifting piston 55 has a narrow front portion and a large diameter portion 55a at the rear portion. The hydraulic pressure of the lifting hydraulic chamber 52 acts on the front end surface of the large diameter portion 55a. Lifting piston 55
Is lifted rearward by the hydraulic pressure of the hydraulic chamber 52, and the rear end of the spline portion 10a of the shank rod 10 is
And the shank rod is lifted and held until the rear end reaches an appropriate striking position by the striking piston 5. The lifting force only needs to be sufficient to raise the shank rod 10 to which the below-described impact tool is attached at the tip. If this force is increased unnecessarily, the loss of the impact energy increases, which is not preferable.

A striking rotary tool (bit) 60 is attached to the shank rod 10. The impact rotary tool 60 is similar to a lock bit used in civil engineering work and the like, and a known lock bit can be used as it is. The impact rotary tool is usually mounted using screws, but may be secured in other ways. Also,
If the length of the shank rod 10 is too short, a connecting sleeve may be added to the tip of the shank rod 10 for use. In this case, a striking rotary tool is attached to the tip of the relay rod.

In the lifting state, when the striking piston 5 moves forward and strikes the rear end face of the shank rod 10, the lifting piston 55 in contact with the shank rod 10 moves forward together with the shank rod. At this time, the pressure oil in the hydraulic chamber 52 is sent to the accumulator 53 and is kept in a compressed state. When the shank rod moves forward and the striking tool at the tip hits the crushed portion, the shank rod retreats by reaction. At this time, the lifting piston 55 is again pushed up by the hydraulic pressure sent from the accumulator.

As described above, since the lifting device 50 for lifting the shank rod to an appropriate hitting position is provided, even when the rock drill is held vertically downward and suspended,
There is no so-called blank hit. Therefore, no hitting will occur when hitting something that is not strong enough to lift the bit and shank rod.

FIG. 6 is an overall view of a repair device to which the rock drill is mounted. The repair device 70 is used by attaching the rock drill to a moving device 71. In the illustrated example, the main body of a crawler-type hydraulic excavator is used as the moving device, but another suitable moving device may be employed. In the figure, 73 is a boom of a hydraulic shovel, 74 is an arm, 75 is a dedicated bracket for mounting a rock drill, and 77 and 79 are hydraulic cylinders. The hydraulic pressure for driving the rock drill is diverted and supplied from a hydraulic device of the hydraulic shovel.

A rotating shaft 81 is mounted on the bracket 75, and a mounting head 80 is mounted on the shaft 81. Therefore, the mounting head 80 is
The rock drill is fixed to this mounting head. The shaft 81 is provided with an arm 83 projecting in a radial direction, and a piston rod of a swing hydraulic cylinder 85 attached to a bracket 75 is connected in a crank shape. When the hydraulic cylinder 85 is expanded and contracted, the mounting head 80 rotates forward and reverse around the axis 81, and the left and right angles of the rock drill 1 mounted on the mounting head 80 change. Therefore, the angle of the rock drill 1 with respect to the vertical axis can be freely adjusted.

When using the repair device 70, as shown in the figure, the rock drill 1 attached to the tip of the arm is held downward, and the degraded layer on the inner surface of the tapping trough T is hit with the impact tool 10 as shown in FIG.
Crush with. As an example of the crushing procedure, first, the moving device 71 is positioned near one end of the repair location, and the uppermost layer indicated by A1 is crushed. In this case, the swing hydraulic cylinder 8
5 is operated to adjust the angle of the rock drill, and rock the rock rocker left and right to crush the wall surfaces on both sides of the tapping gutter. When the wall surfaces on both sides are crushed to a predetermined depth, the moving body is gradually moved and crushed along the longitudinal direction of the gutter at the same level.

When the crushing of the uppermost layer A1 is completed, the moving device is returned to its original position, the height of the rock drill is lowered, and the next level A2
Is similarly crushed. In this way, by performing the crushing in order, it is possible to efficiently crush and remove the degraded layer at all repair locations of the gutter. During crushing, compressed air supplied from an external compressor to the rock drilling machine is guided to the striking rotary tool through the hollow portion of the blow tube 7 and the shank rod 10, and is provided on the striking rotary tool. Discharge from the discharge port. As a result, the impact rotary tool is cooled and the powder is discharged.

[0029]

As described above, since the rock drill of the repair device according to the present invention is provided with the lifting device which acts to lift the shank rod backward, the rock drill is used downward. However, no idle hitting occurred, and it was possible to always perform an appropriate hitting even on a soft layer such as a deteriorated layer of a tapping gutter. It goes without saying that this rock drill can be used sideways. It is also clear that the rock drill can be used for purposes other than tap gutter repair.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional view of a lifting device in an operating state according to an embodiment of the present invention.

FIG. 2 is a front view showing a part thereof in a cross section.

FIG. 3 is a side sectional view showing a state in which the lifting device is not operated.

FIG. 4 is a sectional view of a conventional rock drill.

FIG. 5 is an external view of a shank rod.

FIG. 6 is an explanatory view of a crushing method viewed from a side.

FIG. 7 is an explanatory view of a crushing method viewed from the front.

FIG. 8 is an explanatory diagram of a striking operation.

FIG. 9 is an explanatory diagram of a striking operation.

FIG. 10 is an explanatory diagram of a striking operation.

FIG. 11 is an explanatory diagram of a striking operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rock drill 3 Cylinder 5 Hitting piston 7 Blow tube 10 Shank rod 15 Valve 20, 20 'Accumulator 23 Diaphragm 30 Rotating device 36 Chuck driver 40 Chuck 50 Lifting device 51 Lifting cylinder 52 Hydraulic chamber 53 Lifting Accumulator 55 Lifting piston 70 Repair device 71 Moving device T Tapping gutter

──────────────────────────────────────────────────続 き Continued on the front page (73) Patent holder 391051326 Yamamoto Lock Machine Co., Ltd. 2-73-3 Marunouchi, Chiyoda-ku, Tokyo Tokyo Building 263-ku (72) Inventor Ryoji Ito 1 Kanazawacho, Kakogawa City, Hyogo Prefecture Address Kobe Steel, Ltd.Kakogawa Works (72) Inventor Toshitake Okada 1 Kanazawacho, Kakogawa City, Hyogo Prefecture Kobe Steel Co., Ltd.Kakogawa Works (72) Inventor Etsuni Emoto 1 Kanazawacho, Kakogawa City, Hyogo Co., Ltd. Kobe Steel Kakogawa Works (72) Inventor Shigeo Shoji 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi, Okayama Prefecture (No address) Kawasaki Steel Corporation Mizushima Works (72) Inventor Hiroshi Fukumori Kajima-cho, Kashima-gun, Ibaraki Prefecture Address Sumitomo Metal Industries, Ltd.Kashima Works (72) Inventor Katsushi Okuda Shika, Ibaraki Kashima-cho, Gunma 3 Oita, Sumitomo Metal Industries, Ltd.Kashima Works (72) Inventor Hiroshi Nakatani 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Koichi Tomioka Marunouchi, Chiyoda-ku, Tokyo 1-2-1 Nippon Kokan Co., Ltd. (72) Inventor Hiromi Kawakami 36 Tojo-cho, Tojo-cho, Hiba-gun, Hiroshima Prefecture Inside the Tojo Plant of Yamamoto Tekkosho Co., Ltd. (72) Inventor Kaichi Yataya Tojo-cho, Tojo 36 Co., Ltd. Inside the Tojo Plant of Yamamoto Iron Works (72) Inventor Noboru Terakuu 36, Tojo-cho, Hiroshima Pref. .Cl. ⁶ , DB name) C21B 7/14 304 F27D 1/16

Claims (1)

(57) [Claims] 1. A tapping piston for hitting a shank rod with a striking piston, and a tapping gutter equipped with a rock drilling machine for rotating and crushing a crushed portion with a striking and rotating tool attached to the tip of the shank rod. In the apparatus, a hydraulic chamber having an accumulator for holding a predetermined hydraulic pressure is provided at a front portion of the rock drill, and a lifting piston for pressing a shank rod backward by hydraulic pressure of the hydraulic chamber is provided. Repair equipment such as tapping gutters.