JPH0137445B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention provides a drill hammer in which the drill hammer is guided on a gun carrier which is pivotable into and out of the working position and serves to move the drill rod, the striking rod or the tapping rod. , relates to a taphole opening machine in which a guide for this rod is provided at the furnace-side end of the gun carriage.

Traditionally, the opening of the taphole in metallurgical furnaces, especially blast furnaces, was carried out by drilling with a drill rod or by making a preliminary hole with a drill rod and subsequently driving the remaining wall with a hammer rod. Ta. This tool, which comes into contact with the liquid furnace contents, is shortened by combustion or melting, but is usually shortened by the drill gun carriage even after the drill hammer has been retracted to its starting position opposite the furnace. It is supported by a guide at the furnace end.

According to relatively new methods, the taphole is no longer enlarged by drilling. Instead, after a certain period of time has elapsed after the taphole is closed, a steel rod (hereinafter referred to as the taphole) is driven into the furnace by a drill hammer configured as a counter-attack hammer. Then, when the hot water is poured out, it is pulled out again by a drill hammer (counterattack hammer) that operates backwards.

This tapping rod must be long enough to ensure that it reaches the inside of the furnace. This tapping rod therefore generally projects a certain distance into the furnace interior through the taphole. Since this protruding part of the tapping rod melts before pouring, the tapping rod becomes shorter by this protruding part. When withdrawing the tapping rod, the counter-drill hammer is retracted to its rear end position. Before the drill hammer reaches this end position, the shortened tapping rod slips out of the guide at the furnace end of the drill gun carriage. As a result, a clamping device for connecting a tapping rod to a drill hammer, a drill hammer,
The tool carrier, which protrudes from the drill hammer or is located within the drill hammer, is unacceptably stressed by the weight of the tapping rod. Accordingly, the parts will be damaged, generally in the form of permanent failure or fatigue failure.

Appropriate strengthening of drill hammers has not been implemented for economic reasons as well as because of the wide range requirements. By increasing the distance between the front metal fitting of the furnace and the front guide on the gun carriage,
It can be reliably supported up to a certain combustion length. By increasing this spacing, the perforation and the position of the tapping rod at the desired location become inaccurate;
Furthermore, the space required within the casting bay for the entire apparatus is significantly increased. Furthermore, it is conceivable to stop the rearward movement of the drill hammer at the moment the front end of the tapping rod exits the taphole. However, this is not possible. This is because the operator does not know the actual length of the burnt tap rod, and if the required spacing between the taphole inlet and the rod guide at the front end of the gun carriage is narrow, the operator can react quickly. This is because it cannot be done.

The object of the invention is to solve the above-mentioned problem by relatively simple means without requiring additional space.

This is achieved according to the invention by providing an additional support device for the rod.

In a first embodiment of the invention, an additional support device is slidably guided on the gun carriage, the said support device being arranged on the drill bit in such a way that its sliding movement is controlled by the feed movement of the drill hammer. When connected to the drill hammer and the drill hammer is in the forwardmost position, the distance between the supporting device and the drill hammer is minimum, and when the drill hammer is retracted, the distance is maximum.

It is advantageous if the support device has inner and outer support arms which can be pivoted below the drill rod, striking rod or tapping rod. In this case, the carrying arm can be mounted on a support device in such a way that it can be pivoted about an axis approximately perpendicular to the longitudinal axis of the gun carriage.

the carrying arm pivots outward when the drill hammer is forwardmost and pivots inward when the drill hammer is retracted;
It is advantageous if the coupling device of the support device and the drill hammer controls the pivoting movement of the carrier arm.

According to a particularly advantageous embodiment of the first embodiment, the support device is connected to the drill hammer via a control rod, which control rod is arranged parallel to the longitudinal axis of the gun carriage and is suitably mounted. One of the control rods is movable relative to the support device and the drill hammer between the stoppers, and one of the control rods is connected to the carrier arm via a forked lever for pivoting the carrier arm.

In a second embodiment, an additional support device is mounted stationary on the gun carriage and comprises a rotatable carrying arm. In this case, a carrier arm for the drill rod, striking rod or tapping rod to be supported is mounted such that it can pivot inwardly and outwardly about an axis approximately perpendicular to the longitudinal axis of the gun carriage, the pivoting movement of this carrier arm is controlled via a cam roller by a control lever fixed to the drill hammer. A return spring is expediently provided for the inward pivoting of the carrier arm into the initial or support position. However, the inward and outward pivoting of the carrier arm can also be effected by a complementary, i.e. positive-motion, connection of the cam roller and the control lever.

In a variant of the second embodiment, the carrying arm is mounted pivotably about an axis approximately parallel to the long axis of the gun carriage.

In this case, the pivoting movement of the carrier arm is controlled via a cam roller by a control rail fixed to the drill hammer, and the inward pivoting of the carrier arm into the support position is controlled by the own weight of the carrier arm and/or by a spring. can assist.

Instead of the purely mechanical control mechanism described above for the additional support device, a pneumatic or hydraulic pressure medium cylinder, which is also controlled by the movement or position of the drill hammer, for pivoting the carrying arm can be used. Alternatively, the pivoting movement of the carrier arm can be effected by an electric actuator.

The present invention provides an additional support device for a taphole shedding machine that satisfies the following conditions in a preferable manner (see FIGS. 1 and 2).

(1) When retracting the tap rod, which was originally length L and has been shortened by the dimension △L due to combustion, the support device prevents the tap rod from slipping off the front guide of the tap rod on the gun carriage. Make sure that the drill hammer is at a sufficient distance
ensuring that the drill hammer and the clamping device for the tap rod are not overloaded by the rod support at the moment when the front end of the tap rod is released upon reaching SL (support length); (2) the support device; (3) after driving the tap rod, the entire taphole shedding machine should be moved upward and outward, (4) Ensure that the support device does not increase the distance A between the front end of the drill gun carriage and the taphole inlet. (5) The opening and closing of additional support devices shall be carried out automatically in coordination with the operation of the taphole shedding machine.

After explaining the problem on which the present invention is based and its principle solution with reference to FIGS. 1 and 2, actual embodiments of the present invention will be explained based on FIGS. 3 to 9. .

The reference numerals used in the following description also appear in FIGS. 1 and 2, where the elements designated thereby are shown schematically in these figures.

The taphole opening machine or taphole opening gun essentially consists of a drill gun carriage 1. This gun carriage can be swung upwards and outwards in a known manner (see arrows in FIGS. 1 and 2).
Drill hammer 2 formed as a counterattack hammer
is slidably guided on said gun carriage 1 and is provided at its end on the side of the furnace 3 (see FIGS. 1 and 2) with a clamping device 4 for accommodating a tapping rod or tap rod 5. ing. Instead of this tapping rod, a drill rod or a striking rod can be clamped, but in the following only the tapping rod will be discussed. This is because the problem to be solved here mainly arises in the case of this tapping rod.
At the end of the gun carriage 1 on the furnace side, there is a tapping rod 5.
A guide 6 is provided for this purpose. This guide can be opened in the following cases. That is,
The tap rod 5 is the tap hole of the furnace 3, that is, the tap hole 7
(See Figure 2) When swinging the entire taphole shedding machine upward and outward,
Can be opened. This oscillation is carried out in order to remove the taphole opening machine above the casting spout which is still filled with hot pig iron.

Furthermore, an additional support device 8 for the tap rod 5
is slidably guided on the gun carriage 1. This support device comprises a support arm 9 which can be pivoted inwardly and outwardly below the tapping rod 5. This carrying arm is rotatably mounted around an axis 10 approximately perpendicular to the longitudinal axis of the gun carriage 1 and is rigidly mounted on a shaft to which a two-pronged lever 11 is fixed at its upper end.

The drill hammer 2 and the additional support device 8 are connected to each other via control rods 12, 13 parallel to the gun carriage 1. This control rod 12, 13
is slidably supported on a projection 14 of the drill hammer 2 and a projection 15 of the support device 8. However, in this case the distance and direction of this relative movement will be determined by appropriate stops 16, 17, 1, as explained below.
8 and 19.

In FIG. 3, the drill hammer 2 has reached its end position in front of the furnace 3 and an additional support device 8 is shown.
It is at the shortest distance c from The carrying arm 9 of the support device 8 pivots outwards with the front, opening a passage for the drill hammer or at least its clamping device 4. A tapping rod 5 is driven into the furnace 3. From the tapping rod 5 to the clamping device 4
After removing it and opening the front guide 6, the taphole opening machine can be swung upwards and outwards. This is because when all the moving parts are in this position, the carrying arm 9 of the support device 8 is
This is because it releases

The rearward withdrawal of the tap rod 5 from the tap hole 7 of the furnace 3 is best explained on the basis of FIG.
To start tapping, first place the taphole opening machine in the position shown in FIG. Close the guide 6 at the side end. When starting the rearward movement of the drill hammer 2 - the tapping rod 5 being pulled back with it - until the projection 14 of the drill hammer 2 reaches the stop 16 of the control rods 12, 13.
The additional support device 8 stops and its carrying arm 9
remains turned outward (see the position indicated by the dashed line in Figure 4). After that, the control rods 12, 13
is taken along by a dimension a. In doing so, the driver 20 of the stop 19 of the control rod 13 pivots the fork 11 from the position 11' by approximately 90 degrees, so that the carrying arm 9 of the support device 8 is directed inwardly and downwardly of the tapping rod 5. Once circling. At this moment, a predetermined maximum support length SL=a+b+c is achieved (dimension c is the distance between the center of the carrier arm 9 and the clamping device 4 according to FIG. 3). When the drill hammer 2 is moved further rearward, the support device 8 is also carried along by sliding onto the gun carriage 1. Because the control rod 12,1
This is because the stopper 19 of No. 3 reaches the protrusion 15 of the support device. In this state, the tapping rod 5, which has been shortened by the dimension ΔL (see Figure 1), can be easily removed by sliding it out of the guide 6, taking care not to allow the drill hammer 2 and clamping device 4 to be removed. No additional load is required. As soon as the tapping rod 5 emerges from the taphole 7, the entire taphole opening machine can be swung out of the liquid iron jet, ie upwards and outwards. If the tap rod 5 were not additionally supported, this movement would generate an additional inertial force of the tap rod. This inertial force can hardly be absorbed by the clamping device 4 and the drill hammer 2.

A new (unshortened) tapping rod 5 is driven in as follows. The tapping rod 5 is fixed in the clamping device 4. The drill hammer 2 is then in its end position opposite the furnace 3 (approximately the position shown in FIG. 2). The relative movement of the drill hammer 2 and the additional support device 8 takes place as shown in FIG. However, in FIG. 4 the drill hammer 2 is not placed in its end position opposite the furnace 3, but is in a position in which it carries an additional support device 8 via the control rods 12, 13. The new tapping rod 5 is located in a guide 6 at the front or furnace end of the gun carriage 1. This is because the tap rod then has its original, unshortened length L (see FIG. 1). When the drill hammer 2 is fed, the tap rod 5 is driven into the tap hole 7 which was closed a predetermined time ago. During this feeding of the drill hammer 2, it does not matter what state the support device 8 is in during the feeding b. If the friction between the support device 8 and the gun carriage 1 is greater due to the friction between the tap rod 5 and the inwardly pivoting support arm, the support device 8 initially remains at rest. It can be provided that the control rod 12 is first moved together with the drill hammer 2 until the stop 18 of the control rod 12 abuts the projection 15 of the support device 8 . Therefore, when the support device 8 begins to move, even if there is already a frictional situation in which the carrier arm 9 pivots outwards, this is meaningless. This is because the additional support device 8 does not necessarily perform a support function when driving the tapping rod 5. However, an outward pivoting of the carrier arm 9 in advance b is unlikely to occur.
This means that when the projection 14 of the drill hammer 2 reaches the stopper 17 and entrains the control rods 12, 13, at least the control rod 13,
It will definitely be done. This is because the drill hammer 2 then approaches the support device 8, which at that point causes the carrier arm 9 to pivot outwards and open the passage for the drill hammer 2. For this outward pivoting of the carrier arm 9, a feed a is used. After the speed a has been achieved, the support device 8 is also carried through the stops 17, 18 of the control rods 12, 13 to the end stop 21 of the gun carriage 1 (see FIG. 4). Thereby, the entire apparatus is placed in an end position near the furnace as shown in FIG. Thereafter, it is only necessary to open the front guide 6 in order to be able to swing the entire taphole opening machine upwards and outwards until the next tap.

5 to 9 show embodiments in which an additional support device 8' or 8'' is placed in place on the gun 1. FIGS. 5 to 7 show the support arm 22. 3 and 4, the support device 8' is shown with a support device 8', which, like the support arm 9 of FIGS. The carrying arm 22 is fixed to the shaft 23.
A roller lever 25 having a cam roller 26 is provided on the boss 24 . The cam roller cooperates with a control lever 27 fixed to the drill hammer 2. The bearing 28 of the shaft 23 is fixed to the gun carriage 1 via a bridge 29. When the drill hammer 2 approaches the support device 8' in the feed direction,
The carrier arm 22 is moved by a control lever 27 via a cam roller 26 and a roller lever 25 to a position 22' (see FIGS. 5 and 7) approximately 90 degrees below the tapping rod 5.
It is rotated to the outside. Therefore, the drill hammer path for further feeding of the drill hammer 2 is open. After driving in the hot water tap 5, the first
As explained based on FIGS. 1 to 4, in the case of the embodiments shown in FIGS. 5 to 7, after opening the front guide 6 (see FIGS. It can be rocked and rocked outward.

When the support device 8' has passed during the rearward movement of the drill hammer 2, the control lever 27 releases the roller lever 25. The return spring 30 can therefore pivot the carrier arm 22 inwardly below the tapping rod 5. One end of this return spring 30 is attached to a lever 31 fixed to the shaft 23, and the other end is attached to an eye 32 of the bridge 29. Instead of the return spring 30, a cam roller 26 and a control lever 27 are used to pivot the carrier arm 22 inward.
(not shown). The entire operating process is the first
This is done in the same way as in Figures 4 to 4.

8 and 9 show a further embodiment for a support device 8'' fixed to the gun carriage 1. In this case, a carrying arm 33 is fixed to a shaft 34, which , is supported pivotably about an axis substantially parallel to the longitudinal axis of the gun carriage 1 by a bearing 35 on a bridge 36 fixed to the gun carriage 1, and a boss 37 of the carrier arm 33 is mounted at its furnace end. , and its end facing away from the furnace is connected for rotation with the boss 38 of a roller lever 39 with a cam roller 40. A control rail 41 bent according to the swivel movement is fixed, which controls the carrying arm 33 as shown in FIG. The drill hammer 2 is rotated upward from the movement space. FIG. 8a shows important parts of the control lever 41 of FIG. 8 in a side view.
The control rail 41 can be formed by a bent tube or other rod-shaped member with a circular cross section. During the rearward movement of the drill hammer 2, the carrier arm 33 pivots inwardly under its own weight along the control rail 41 again into the supporting position. This is because the arm length from the center of gravity of the carrying arm 33 to the axis of rotation of the shaft 34 is sufficiently long so that the weight of the carrying arm generates a sufficiently large moment for inward pivoting. It is. Furthermore, an additional return spring (not shown) can be provided. Dimension a in FIGS. 8a and 9, like dimension a in FIG. 4, corresponds approximately to the control stroke for the pivoting of the carrier arm 33.

Even if the above-mentioned purely mechanical control mechanism for the additional support device 8, 8', 8'' is advantageous for reasons of robustness and reliability, it cannot be controlled automatically depending on the working process. It is within the scope of the invention to use hydraulic cylinders, pneumatic cylinders or electrical actuators.

[Brief explanation of drawings]

Fig. 1 shows the tapping rod being driven into the furnace, Fig. 2 shows the tapping rod being pulled out from the furnace, and Fig. 3 shows the first embodiment of the present invention. FIG. 4 is a plan view of the first embodiment;
FIG. 5 is a plan view of the second embodiment, and FIG. 6 is a plan view of the second embodiment.
FIG. 7 is a cutaway view of a part of the embodiment shown in FIG. 6 taken along the - line;
FIG. 8 is a view similar to FIG. 6, looking in the direction of the arrow in FIG. 9, of a modification of the second embodiment; FIG. 8a is a side view of a part of the modification of FIG. 8; Figure 9 is the 8th
It is a top view of the modification of a figure. Symbols in the figure: 1...Gun carriage, 2...Drill hammer, 5...Taking rod, 8, 8', 8''...
Support device, 9... Carrying arm, 10... Axis, 1
1... Two-pronged lever, 12, 13... Control rod, 1
6, 17, 18, 19...stopper, 20...
Carrying arm, 22, 33... Carrying arm, 23...
... shaft, 26 ... cam roller, 27 ... control lever, 30 ... return spring, 34 ... shaft, 40 ... cam roller, 41 ... control rail.

Claims (1)

[Claims] 1. A drill hammer is guided on a gun carriage which can be swiveled into and out of the working position and serves to move a drill rod, a striking rod or a tapping rod, and which In a taphole opening machine in which a guide for the rod 5 is provided at the end of the gun carriage on the side of the furnace, an additional support device 8, 8', 8'' for the rod 5 is provided. 2. A taphole shedding machine according to claim 1, characterized in that an additional support device 8 is slidably guided on the gun carriage 1. 3. Support When the support device is connected to the drill hammer and the drill hammer 3 is in the forwardmost position, the support device 8 and the drill hammer 2 are connected so that the sliding movement of the device 8 is controlled by the feed of the drill hammer 2. The taphole according to claim 1 or 2, characterized in that the distance is a minimum distance c, and the distance is a maximum distance SL when the drill hammer 2 is retracted. Opening machine.4 From claim 1, characterized in that the support device 8 is provided with a carrying arm 9 which can be pivoted inwardly and outwardly below the drill rod, striking rod or tapping rod 5. A taphole opening machine according to any one of the preceding clauses 5. The carrier arm 9 is supported on the support device 8 so as to be pivotable about an axis 10 substantially perpendicular to the longitudinal axis of the gun carriage 1. The taphole opening machine according to claim 4, characterized in that: when the drill hammer 2 is located at the forefront, the support arm 9 pivots outward, and the drill hammer 2 The support device 8 is attached to the drill hammer 2 in such a way that the carrying arm 9 pivots inwardly when retracted.
6. A taphole shedding machine according to claim 1, characterized in that devices (11-19) connected to the support arm (9) control the pivoting movement of the support arm (9). 7. The support device 8 is connected to the drill hammer 2 via control rods 12, 13, which control rods are arranged parallel to the longitudinal axis of the gun carriage 1 and suitably arranged stops 16, 17, 18, 19.
One of the control rods 12 , 13 is connected to the carrier arm 9 via a forked lever 11 in order to be able to move relative to the support device 8 and the drill hammer 2 between them, and to further pivot the carrier arm 9 . A taphole opening machine according to any one of claims 1 to 6, characterized in that: 8 Additional support devices 8', 8'' are placed on the gun carriage 1 and pivotable carrying arms 22,
23. The taphole opening machine according to claim 1, characterized in that the taphole opening machine comprises: 23. 9 A carrier arm 22 for the drill rod, striking rod or tapping rod 5 to be supported is mounted pivotably inwardly and outwardly about an axis 23 approximately perpendicular to the longitudinal axis of the gun carriage, the pivoting movement of the carrier arm 22 9. The tap opening machine according to claim 8, wherein the tap opening machine is controlled by a control lever 27 fixed to the drill hammer 2 via a cam roller 26. 10. A taphole shedding machine as claimed in claim 8 or 9, characterized in that a return spring 30 is provided for pivoting the carrier arm 20 into its initial or supporting position. 11. The taphole according to claim 8 or 9, characterized in that the cam roller 26 is integrally connected to the control lever for pivoting the carrier arm 22 inwardly and outwardly. Opening machine. 12. A taphole shedding machine according to claim 4, characterized in that the support arm 33 is supported so as to be pivotable about an axis 34 substantially parallel to the longitudinal axis of the gun carriage 1. 13. The taphole shedding machine according to claim 12, characterized in that the pivoting movement of the support arm 33 is controlled via a cam roller 40 by a control rail 41 fixed to the drill hammer 2. . 14. The taphole shedding machine according to claim 12 or 13, characterized in that the inward rotation of the support arm 33 to the supporting position is assisted by its own weight and/or a spring. 15. Claims 1 to 3, characterized in that a pressure medium cylinder is provided for pivoting the carrier arm 9, 22, 33, which is controlled by the movement or position of the drill hammer 2. The taphole opening machine according to any one of Items 6 to 8. 16. Any one of the preceding claims 1 to 6 and 8, characterized in that an electric actuator is provided for pivoting the carrier arm 9, 22, 33. The taphole opening machine described in .