LU84781A1 - METHOD AND DEVICE FOR HANDLING Tapping rods for blast furnace tapping holes - Google Patents

Description

«I

-1- 11 Method and device for handling tapping bars for blast furnace tapping holes "

The invention relates to a method for handling tapping rods for blast furnace tapping holes! 5 in particular when using the tapping method, according to which the tapping rod is displaceable by means of a pneumatic tool with the aid of a work tool which can be displaced on a mount of a tap hole drilling machine; motor are generated, after a tapping 10 is driven into the not yet fully hardened tap hole * mass *, and to initiate another

Tapping is pulled out of the stuffing with the help of the working tool. It also relates to a device for carrying out the method.

15 Until some time ago, the tap hole on blast furnaces was consistently opened by drilling out the hardened stuffing compound closing the tap hole with the help of an impact drill. Today, however, a new tapping method is preferred, which consists in closing the tap hole by means of stuffing compound to end a tapping process and then hammering in a tapping rod through the not yet hardened stuffing compound, which remains in the stuffing compound until the next tapping and to initiate this procedure -25 stitch is pulled out of the hardened stuffing, usually with the help of a counterblow hammer tool, that is, a tool whose hammer can hit in both directions.

To ensure that the tapping rod reaches the inside of the blast furnace with certainty when it has not yet fully hardened, it is driven in so far that it is usually a certain amount Ä into the interior of the furnace, that is, into the molten material

Pig iron protrudes .. This front end of the tapping rod, which protrudes into the furnace interior, soon melts, so that the rod is shorter by this melted piece when it is pulled out of the tapping hole, that is to say when the next tapping process is initiated.

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If during this extraction process, which is carried out with the help of the tool of the tap hole drilling machine, the tool is returned to its rear end position, from which it started for the advancement of the tapping bar, the tapping bar falls out of its guidance due to the shortening The front end of the mount is out and is therefore now only held by the gripping device of the working tool, i.e. the approximately horizontal tapping rod is suspended in this gripping device and, due to its weight, exerts a static moment on the gripping device and the parts connected to it Working tools from which they are not designed to be received. Damage and even destruction of these expensive work tool components is the result.

One way to prevent the tapping rod from falling out of its guide at the front end of the carriage during the extraction process would be for the operator to immediately stop the retraction movement of the tapping rod when the front end of the rod has left the tap hole, that is before the rod can fall out of its guide at the front end of the carriage. Such an approach to avoid damage to the above-mentioned work tool components would, however, automatically require reliable responses from the operator and would therefore be quite unreasonable, since with the slightest carelessness on the part of the operator, the rod could still fall out of its guide * 30.

* It has therefore been proposed (see, for example, DE-OS 31 11 260) to provide a second guide * for the tapping rod, which lies behind the rod guide provided at the front end of the carriage

35 and then comes into operation when the tappet end leaves this front guide. However, such a second ‘leadership must, as is the case in the aforementioned DE-OS

-3- is explained in more detail, can be pivoted so as not to hinder the feed movement of the working tool. Also known are second guides which are slidably arranged on the carriage. This process therefore requires a considerable amount of mechanical and other means.

To avoid these disadvantages or inadequacies of the prior art, it is the object of the invention to use a method of the type mentioned at the beginning. To propose 10 genus, with the help of which it is prevented that the tapping rod leaves the guide provided at the front end of the work tool mount during the extraction process, so that the provision of a second guide with the associated expenditure on mechanical means 15 becomes superfluous.

Starting from a method of the type mentioned at the outset, this object is achieved by the features stated in the characterizing part of the main claim. The features of an apparatus for carrying out the method are evident from the characterizing part of claim 5.

Further features of the invention result from the characteristics of the subclaims.

Exemplary embodiments of the invention are shown in the drawings, in which the same parts are provided with the same reference numbers, and are described in more detail below. Show it :

Figure 1, the tap hole area of a blast furnace with a longitudinal section through the blast furnace wall and the tapping groove, as well as a drill carriage with the working tool and a clamped in the not yet fully hardened stuffing stick in its rear end position or at

Start of feed movement of working tool and Ab-35 rod}

Figure 2, like Figure 1, but after driving the tapping bar and with the work tool in its front end position;

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Figure 3, the tapping rod in the tap hole between two tapping operations;

Figure 4, like Figures 1 and 2, but with the work tool in a predetermined intermediate position 5 and shortened tapping rod pulled out of the tap hole;

FIG. 5, like FIG. 4, but in a top view and on a somewhat enlarged scale (and with an indication of the pivoting away of the carriage and tapping rod); k 10 Figure 6, like Figure 5, but with the working

Tool in a further forward, pre-determined intermediate position and still partially protruding into the tap hole;

Figure 7, similar to Figure 6, but after 15 initiation of the pivoting movement of the carriage;

Figure 8, similar to Figure 7, but in a more advanced phase of swinging the carriage, and released tap hole with pig iron flowing out; Figure 9, the general representation of a pneumatic circuit diagram for the control of the forward and return of the work tool;

Figure 10, like Figure 9, but with control of the pneumatic circuit for advance of the working tool;

FIG. 11, like FIG. 9, but with control of the pneumatic circuit for returning the work tool}

Figure 12, like Figure 11, but with means 30 to interrupt the return of the work tool.

FIG. 1 shows the mount 20 of a tap hole drilling machine in the working position in the tap hole area 22 of a blast furnace 24. A work tool 26 with a tap rod 28 clamped therein can be moved along the mount 20 by means of 35 known (not shown) means. These means normally consist of a chain driver device, t · I, which is driven by a pneumatic motor.

Yy • · -5-

In this FIG. 1, the working tool 26 is in its rear end position on the carriage 20, from which it starts to advance the tapping rod 28 into the not yet fully hardened stuffing mass 30 5 in the tap hole channel 32 of the blast furnace 24. In this starting position of the working tool 26, the tapping rod 28 is held displaceably in a guide 34 of the mount 20.

By advancing the work tool 26 * 10 with simultaneous actuation of the work tool stroke- *. hammer rod 28 is driven into the stuffing mass 30 *, the latter taking over the leadership of the rod 28 to an ever increasing extent. Finally, the position shown in FIG. 2 is reached, 15 in which the working tool is in its front end position on the mount 20 and the tapping rod 28 first by a certain piece 36, which is longer than the piece projecting from the mount 20 in FIG 38, protrudes into the oven interior.

FIG. 3 shows the tapping rod 28 located between two taps in the tamping mass 30 of the tapping channel 32. The rod piece 36 projecting into the furnace interior, that is to say into the molten pig iron, melts rapidly, so that the tapping rod 28 has now become 25 pieces shorter . In this time interval between two taps, the carriage 20 with the working tool 28 is in its rest position (not shown).

If the next tapping is to take place, the 30 carriage will be brought back into the working position

The end of the rod 28 protruding from the furnace is gripped by the gripping device 40 of the advanced working tool 26 and the latter is moved back along the mount 20 by actuating its counterblow hammer device. If the work tool is moved back to its starting position shown in FIG. 1, the tapping rod 28 finally falls out of its guide 34, since the melted rod section 36 is longer than the 40 | originally from the guide 34 is excellent rod piece 38 * * -6-. In order to prevent damage to the gripping device 40 and other expensive components of the work tool 26 when the guide 34 for the tapping rod 28 is lost, a second switch, which can be switched on and off or displaced, is used in accordance with the prior art, as mentioned above in FIG. 5 Guide provided behind the guide 34 for supporting the shortened tapping rod 28.

In order to avoid providing such a second guide, which involves considerable technical effort, the method according to the invention provides for *. Pulling out the tapping rod 28 does not * retract the working tool to its rear end position (FIG. 1), but only to such an extent that the rod 28 can certainly not fall out of its guide 34 at the 15 front end of the carriage despite the melted-off piece 36 (FIG. 4).

In order to stop the working tool 26 when moving back before reaching its rear end position, pneumatic means are provided which are described in connection with FIGS. 9, 10, 11 and 12 and of which 20 a switching rail 42 on the working tool 26 and a pneumatic valve 44 there are 20 components on the carriage. When the working tool 26 moves back, the switching rail 42 acts upon a limit switch 46 of the valve 44, 25 designed as a roller tappet at a certain moment, as a result of which the driving pneumatic feed motor (not shown) for the working tool is stopped.

In Figure 4, the valve 44 is attached with its roller tappet 46 at a location of the mount 20, which ensures that when the roller tappet 46 is acted upon by the shift rail 42, the shortened front end 48 of the

Rod 28 has definitely cleared the tap hole, and also that the front end 48 of the tap rod cannot * fall out of the guide 34 at the front end of the carriage. The carriage, including the working tool and tapping bar, can now be swiveled back into its rest position. The initial phase of this swiveling of the carriage 20 out of the tap hole area is shown in FIG. 5, which is a somewhat enlarged scale a top view of FIG. 4, m t -7- in broken lines (20 ').

The pivoting of the carriage 20 from the area of the molten pig iron now flowing out of the released tap hole takes place immediately after the retraction of the working tool is stopped by the actuation of the valve 44. This way! pivoting of the mount can be triggered manually, or, as the invention advantageously provides as an alternative, automatically when the valve 44 is actuated.

* 10 Even if such an automatic swiveling away of the carriage only a minimum of time = passes until it is removed from the aggressive area of the pig iron flowing out of the tap hole with splashes of liquid pig iron and slag, 15 the invention sees a continuation of the inventive concept for the purpose of even greater protection of the carriage, including accessories, alternatively not to pull the tapping rod 28 completely out of the tapping hole when initiating a tapping, but on the contrary to stop the working tool 26 from moving back when the tapping rod 28 is still one certain piece, as can be seen from Figure 6, protrudes into the tap hole (compare the advanced position of the working tool 26 in Figure 6 compared to Figure 5).

25 This premature stopping of the working tool is of course carried out in the simplest manner in that the valve 44 is arranged further forward on the mount 20 in the direction of the blast furnace in relation to its position according to FIG. 24.

30 In this alternative embodiment of the invention, the last phase of the tapping process takes place, that is to say the uncovering of the tap hole through the blast furnace end of the tapping rod does not result in a correspondingly wide retraction of the working tool, as 35 for example in FIG. 5, but rather in that Swiveling away the carriage 20 is initiated with the tapping rod 28 still partially protruding into the tap hole (FIG. 7). This can be done without the danger f ** - -8- that the swiveling away of the carriage and the associated bending of the front end of the tapping rod (see FIG. 7) will damage the carriage and / or its accessories, since this is an option 5 The front end of the tapping bar 28 is very soft at this stage because of its high temperature and does not offer any appreciable resistance to bending.

FIG. 8 shows how the tapping rod 28 finally releases the tap hole 10 by pivoting the carriage 20 further away. The advantage of this alternative method for clearing the tap hole, as can be clearly seen in FIG. 8, is that when the pig iron outflow from the tap hole is inserted, the carriage is already a certain amount out of the danger zone that the tap hole area in this area

Phase for the carriage, could be removed. This means an increase in the lifespan for the carriage and its accessories.

FIG. 9 shows a preferred pneumatic circuit diagram for carrying out the method according to the invention. The pneumatic drive motor 60 with two directions of rotation V and R for the feed or retraction of the working tool 26 is connected to two compressed air lines 62, 64, which are connected to a four / three-way valve 66 25 as a manually operated control valve for stop, forward (V) and reverse (R) of the pneumatic motor are connected according to the feed and retraction of the work tool. The two other connections of the four / three-way valve 66 are connected to a compressed air source 68 or

30 on a vent 70. As can be seen, the middle *

Position of the four / three-way valve 66 the blocking division, while when moving in the direction V the line 62 is supplied with compressed air and the line 64 is connected to the vent, the motor 60 thus rotates in the direction 35 V for the advance of the working tool 26. When the valve 66 is moved in the R direction, the line 64 receives compressed air supply, while the line 62 i "“ ™ '- -9- accordingly in the R direction for the retraction of the working tool 26. A two / two-way valve 72 is provided in the line 64, with the aid of which the compressed air supply for the direction of rotation R of the motor 60 can be interrupted, 5 especially when the valve 66 is shifted in the direction R. The valve 72 is actuated pneumatically by two control lines 74, 74 ', or

The control line 74 is connected to the line 62 for the feed V and acts on the valve 72 with its branch 74 ', and on a branch 74 "' a three / two-way valve 78 which, for the purpose of displacing this valve in in the opposite direction is acted upon by a further control line 76 "*. In the control line 76" 'an adjustable throttle check valve 80 is provided for throttled volume flow in the direction of the valve 78.

A four / two-way valve 44 controls the application of compressed air from a compressed air source 68 'to either the control line 76' "or else a control line 76 ', which opens into the line 76" in the position of the valve 78 20 according to FIG Supply line 76.

A control rail 42 actuates the valve 44 via a roller tappet 46. These three last-mentioned components of the pneumatic circuit diagram 25 are the same, which are already shown, for example, in FIG. It should also be noted that the control piston area for the actuation of the valve 78 by the line 74 "is larger than that for the actuation of this valve 78 by the control line 76" ', so that at. 30 equal pressure in the control lines 74 "and 76" 'the I valve 78 down, that is to say in its position

Figure 10 is moved. This same pressure in the control lines 74 "and 76" 'is given when these lines are connected 35 to the compressed air sources 68 or 68 *, both of which have the same pressure. That is the general description of the pneumatic switching mechanism Implementation of the method according to the invention.

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In FIG. 10, the control valve 66 is switched to the advance of the pneumatic motor 60, that is to say to the feed of the working tool 26. The position of the valve 72 is given by the fact that the control line 74, 74 '5 lies on the pressure line 42, while the control line 76 "is depressurized. This results from the position of the valve 78, which does have the same control pressure from both sides 10, but assumes the position shown in FIG. 10, since, as further noted '10 above, that assigned to the control line 74 "

Control piston area on valve 78 is greater than that * which is assigned to control line 76 "'.

Due to the position of the valve 44, the control line 76 '"is pressurized with compressed air from the compressed air source 68'. This position exists when the

Shift rail 42 does not act on the roller tappet 46 of the valve 44, which is the case when the working tool 26 with the shift rail 42 is in the feed movement, but only when the working tool 26, which moves from its rear end position

FIG. 1 starts as far as it has advanced that its shift rail 42 releases the roller tappet 46 of the valve 44. As long as the switching rail 42 acts on the plunger 46, the valve 44 is in its position 25 according to FIG. 12, but the valve 78 is in its position according to FIG. 10, so that the pressure line 76 '(FIG. 10) is at the shutoff of the valve 78 is ineffective. The advance of the work tool can also take place when the shift rail 42 acts on the roller 30 tappet 46. Of course, the advancement of the working tool 26 can be interrupted at any moment by bringing the control valve 66 into the blocking division.

In FIG. 11, the control valve 66 is in its 35 position for the return of the work tool 26 from its front end position in the direction of its rear end position on the mount 20. The return of the pneumatic motor 60 is only possible if the valve 72 4 · -11- is in the same position as in FIG. 10. This position of the valve 72 in FIG. 11 is given because in FIG. 11 both control lines 74, 74 ', or

76 "are depressurized (line 74 is now connected to the expansion line 62, that is to the vent 82 of the valve 66), so the valve 72 has no reason to change its previously held position according to FIG. 10.

FIG. 12 shows the phase when the work tool 26 returns, after which the rail 42 has acted on the roller tappet of the valve 44 and the lines 76 and 76 'are connected to one another. On the other hand, because of the control pressure conditions at valve 78 in FIG. 12, there is no reason for valve 78 to change its position in FIG. 11 compared to FIG. 11, line 76 "is also connected to the pressure now prevailing in line 76 ' with the result that the valve 72 is moved into the blocking position and the motor 60, and thus the return of the working tool 26, is stopped prematurely, that is to say 20 before the latter has reached the rear end position on the mount 20 (compare with FIG. 4 6) The carriage 20 is now swiveled away (see FIGS. 5, 7 and 8) and the used tapping rod 28 is removed therefrom. The swivel-25 can be carried out by a signal given manually to the swivel mechanism of the carriage, or else preferably by a signal which this swivel mechanism automatically receives when the rail 42 returns the valve 44 (in whole or in part) pull the tapping rod from the tap hole. For example . could be given an electrical or pneumatic »signal to the swivel mechanism by the lifting movement of the roller plunger 46 in a manner known per se.

If the carriage is now in its rest position after swiveling it away, then it must be made ready for its next use in front of the blast furnace by removing the working tool 26 from its Æ -12- * * before or after inserting a / new tapping rod.

Position, for example according to Figures 4 or 6 (corresponding to Figure 12), is returned to its rear end position on the carriage (see Figure 1).

According to the invention, this is done with minimal effort in that, starting from the respective valve positions according to FIG. 12, the control valve 66 is quickly moved into the forward position (see FIG. 10) and back again into the reverse position. Due to the current forward position, the line 62 and thus 10 receives the control line 74 with its branches 74 'and 74 "• pressure, so that the valves 72 and 78 are brought into their position according to FIG. 10. However, this is the passage to the line 64 open again, and the work tool can be retracted despite the roller plunger 46 15 being loaded.

If during this maneuver of the rapid pushing back and forth of the valve 66, which is associated with a short advance of the rail 42, the role of the roller plunger would come onto the ramp 42 '20 of the rail 42, then, depending on the amplitude of such a downward movement of the Tappet 46, there is a risk that the valve 44 comes into its position according to FIG. 10, and thereby the valve 78 into its position according to FIG. 12, as a result of which the valve 72 (line 74 "is 25 again without pressure!) Due to a residual pressure in the line 76 * would be brought back into its closed position according to Figure 12. In order to make this impossible, the adjustable throttle check valve 80 is provided with the throttle 80 ', which is set such that when the plunger 46 = 30 briefly hits the ramp 42', the switching of the valve 78 into its position according to FIG. 9 takes place so slowly that the rail 42 already moves to the right again (and thus pushes the plunger 46 up again) before this e undesirable valve shifts can occur.

It is of course possible to provide a further, for example push-button-operated valve (not shown) between pressure source 68 'and valve 44, which is actuated during the briefly pushing valve 66 back and forth and the connection between Pressure source 68 'and valve 44 interrupts and the lines 76 and 76 * are vented, making any adjustment of the valve 72 to its blocking position impossible. The adjustable throttle check valve 80 would then be superfluous.

Claims (13)

1. A method for handling tapping rods for blast furnace tapping holes, in particular when using the tapping method, according to which the tapping rod can be moved with the help of a work tool which can be moved on a carriage of a tap hole drilling machine and whose translational movements are generated by a pneumatic motor, after completion of a tapping into the not yet fully hardened one Tap hole stuffing mass is driven in, and 10 is pulled out of the stuffing mass with the help of the working tool to initiate a next tapping, characterized in that the working tool with the tapping rod clamped therein starts when the latter is fed from a rear end position on the mount 15 and with the help of known means is advanced to a front end position, while when the tapping rod is withdrawn from the stuffing mass, the work tool automatically reaches a predetermined intermediate position before it reaches its rear end position Chen front 20 and rear end position is stopped, and that after this intermediate position has been reached, the carriage, together with the working tool and tapping rod, is pivoted away from its working position in front of the tap hole. 2. The method according to claim 1, characterized in that the pivoting back of the carriage only takes place when the tapping rod has completely released the tap hole. 3. The method according to claim 1, characterized in that the pivoting back of the carriage takes place when the furnace-side end of the tapping rod is still a certain distance in the tap hole. 4. The method according to any one of claims 1 to 3, 35 characterized in that the pivoting of the carriage is initiated automatically when the work tool fj reaches its intermediate position mentioned. i -15- ί - · 5. Device for performing the method according to one of claims 1 to 4, characterized by a before the end position of the work tool (26) attached by the backward movement of the working 5 tools (26) actuated limit switch (46) which can be bridged manually or automatically. 6. Device for performing the method according to claims 1 to 4, characterized by a manually operated four / three-way valve (66) with the 10 positions for flow (V) and return (R) of the pneumatic motor (60) and blocking division, a first compressed air source (68) connected to the valve (66), a pressure line (62) between the valve (66) and the motor (60) for the advance (V) of this motor (60), a pressure line 15 (64) between the valve (66) and motor (60) for the return (R) of this motor (60), in line (64) a two / two-way valve (72) as a shut-off valve between valve (66) and motor (60), one to the line (62) connected control line (74) with a first branch (74 ') for controlling the valve (72) into its open position, a second branch (74 ") for controlling a three / two-way valve (78), a control line (76" ) between this valve (78) and the valve (72) for controlling this valve (72) in its blocking position, a second e 25 compressed air source (68 ') with the same pressure as the first compressed air source (68), a four / two-way valve (44) located on this compressed air source (68') by means of a line (76) and actuated by means of a roller tappet (4 6), a first connecting line (76 ') between the valve 30 (44) and the valve (78), a second line (76' ') between the valve (44) and the valve (78) as a control line for this valve (78), an adjustable throttle check valve (80) in this line (76 "'), on the valve (78) a larger effective piston area for the 35 control line (74") than for the control line (76' "), and one on the working tool (26) Mount (20) attached ß shift rail (42) for actuating the roller plunger (46)% of the valve (44). JL il ** * -16- 7. The device according to claim 6, characterized in that when adjusting the control valve (66) in the forward direction (V), the line (62) and thus also the control line (74) with its branches (74 *) to 5 Valve (72) or (74 ") to the valve (78) are pressurized, whereby the valve (78) is actuated in the sense that the control line (76") to the valve (72) is vented and the valve (72) remains in the open position or goes so that the motor (60) can carry out its' 10 forward movement (V). 8. The device according to claim (6), characterized in that upon adjustment of the control valve (66) in the rearward direction (R) the line (62) to the vent (82) of the control valve (66) connected to the 15 expansion line is connected and so that the control line (74) with its branches (74 ', 74 ") is depressurized, thereby actuating the valve (78) under the action of the pressure source (78') with the valve (44) in a corresponding position so that the 20th Control line (76 ") for the valve (72) is connected to the connecting line (76 ') between the valves (78, 74) and thus to the vent on the valve (44), which also means that it is depressurized, so that the valve (72 ) remains in its passage division and the return of the motor (60) 25 can take place. 9. The device according to claim 6, characterized in that in the reverse position (R) of the control valve (66) and upon actuation of the valve (44) by the action of the control rail (42) on the roller tappet (46), 30, the line (76 ' ), which was previously (Figure 11) via y the valve (78) with the control line (76 ") for the valve (72), now also through the valve (44) with the line (76) and thus the Compressed air I source (68 ') is connected, whereby the valve i 35 (72) goes into blocking division and the motor (60) is stopped in its return movement (R). F ----- y IT ^ T 1 * - ► * »l -ΠΙΟ. Device according to one of claims 5 or 8, characterized in that the throttle (80 ') of the controllable throttle check valve (80) for the flow direction from the four / two-way valve (44) to the three / 5 two-way valve (78) is effective and thus control of the valve (78) by the control line (76 "') takes place only slowly. 11. The device according to claim 5, characterized by one of the switching rail (42) at the return 10 of the work tool (26) from its front end position, substantially simultaneously with the valve (44) actuated electrical or pneumatic signal transmitter for emitting a signal to the swivel mechanism for the carriage (20) for the purpose of initiating the pivoting movement of the carriage 4 15 (20) into its rest position. '' γ '