EP0994971B1 - Rotating mechanism with arm - Google Patents

Abstract

A device for rotating a work element is disclosed. The device has a support structure, an arm mounted in the support structure in such a way that it can rotate, a rotation drive for rotating the arm around a rotation pin, the rotation drive being located between the arm and the support structure, and a lifting drive. The support structure represents the frame and the arm represents a driven member of a gear. The lifting drive closes the gear between the support structure and the arm. A coupling device is connected in series with the lifting drive in such a way that the lifting drive can be uncoupled from the gear. The coupling device may have a rotating arm and a locking device, for example. The device can be used as a compact rotating device for carrying a blast furnace gun.

Description

The invention relates to a swivel device with boom for pivoting a work organ between a rest position and a work position. Such a device is used, for example, for pivoting a taphole cannon attached to the boom in a working position the tap hole of a blast furnace, as well as for the subsequent pressing of the Darning cannon inserted into the tap hole.

A classic swivel device for a taphole cannon includes in a known manner a boom at the free end of the tap hole cannon is attached. The second end of the boom is pivotable in one fixed supporting structure. The swivel range of the boom should be as large as possible to keep the stuffing cannon as far as possible from the area of To be able to swing out the launder. It should also be noted that modern Working tamping cannons with ever higher tamping pressures. Therefore also the swivel device, which press the darning cannon against the tap hole should be designed for ever larger contact forces.

To swing the boom are today in the tap hole tamping machines Hydraulic cylinder used. As even with lower stuffing pressures on Blast furnace was worked, rotary motors were replaced instead of hydraulic cylinders to drive the boom. A tap hole tamping machine with an electric motor is described for example in DE-A-895604. This The electric motor transmits its torque via a toothed and worm gear on the boom. A magnetic brake enables the boom in Block working position. It is obvious that with modern tamping machines Such a solution is no longer economical with very high contact pressures is applicable.

From US-A-3,765,663 is a swivel device for a tap hole cannon known that a hydraulic cylinder and a hydraulic rotary motor having. Radially extends to the pivot axis of the boom arm firmly connected to the boom on which the piston rod is one double-acting hydraulic cylinder is fastened by means of a first swivel joint. The housing of this hydraulic cylinder is attached by means of a second swivel joint attached to a fixed arm that extends far from the support structure of the boom protrudes. The hydraulic rotary motor is attached to the boom. He's standing via a pinion with a fixedly arranged on the support structure of the boom Gear engaged. This rotary motor swings the boom between a rest and work position. The hydraulic cylinder has only the task in Working position to transmit a moment of force to the boom to the and press the darning cannon onto the tap hole and then again to tear away. The hydraulic cylinder is only in a short swivel range Near the furnace switched on. Over the rest of the swivel range are his relieved pressure in both pressure chambers to the tank. The stroke of the hydraulic cylinder is designed so that when pivoting the boom, the length of the Hydraulic cylinders inevitably adapt to the changing distance between the adapts first and second swivel. In other words, the swivel device is a closed three-part gear, the supporting structure the frame, the support arm forms the driven link, and the hydraulic cylinder, as a variable link, the gear between the support structure and The boom closes.

From US-A-4,247,088 is a swivel device for a tap hole cannon known, which should be characterized by its compactness. she includes a boom for carrying the taphole cannon, a support structure in which the boom can be pivoted at one end about a pivot axis is mounted, a rotary drive for pivoting the boom between its rest position and its working position, and a hydraulic cylinder, to generate a contact pressure. The hydraulic cylinder is from a side Arm of the support structure worn. It is not fixed to the boom connected, but when swiveling the boom into the working position a toothing on the boom can be engaged.

The present invention has for its object an even more compact To create swivel device.

This object is achieved by a swivel device solved according to claim 1.

A swivel device according to the invention comprises, like the swivel device from US-A-4,247,088, a boom for carrying the work organ; a support structure in which the boom has one end around a Pivot axis is pivotally mounted; a rotary drive, for pivoting the boom between its rest position and its working position, and a lifting drive, for generating a contact pressure. In this As already mentioned, the configuration forms the support structure of the frame Bracket the driven link of a gearbox, which is operated by a linear actuator is closed between the support structure and the boom. The invention Swivel device also includes a coupling device, which such is connected in series with the linear actuator that the linear actuator from the The gearbox can be disengaged. In other words, through the Coupling device can inevitably change the length of the Prevent the linear actuator when swiveling the boom. The total stroke the linear actuator therefore only needs for its actual function, i.e. generating a contact pressure in the working position to be designed. By disengaging the linear actuator when swiveling the boom, is additional freedom of design regarding the arrangement of the linear actuator won in the swivel device. This freedom of design is inventively exploited by the hydraulic cylinder along the boom is arranged, carried by this and via the coupled coupling device can be supported on the supporting structure for transmitting a contact pressure is. As a result, the swivel device according to the invention is extremely compact. Furthermore, in many cases, by disengaging the lifting cylinder, the energy requirement of the swivel device can be significantly reduced.

In a first advantageous embodiment, the coupling device comprises a swivel arm which is pivotally mounted in the support structure. The The linear actuator is mounted between the swivel arm and the boom. With disengaged Coupling device is this swivel arm relative to the support structure and freely pivotable to the boom, its pivot axis essentially is coaxial to the pivot axis of the boom. A locking device enables the swivel arm in the working position relative to the support structure block, causing the linear actuator in the slewing gear, for the purpose of transferring a contact pressure is engaged.

In a first embodiment, a locking device for the above-described swivel arm on a bolt which is used to lock the Swivel arms in and out relative to the support structure in a corresponding elongated hole is executable. This insertion and execution of the locking bolt from the Elongated holes can be made using a short-stroke cylinder, for example.

In a second embodiment, a locking device for the above-described swivel arm on a swivel bolt, which for locking the swivel arm can be swiveled into a position in which it, in Working position of the swivel arm, rests on an abutment. This Locking device has the advantage that relative to the abutment a shock absorber can easily be installed, which the coupling of the Dampens the linear actuator in the swivel gear.

Swivel devices according to the invention are advantageously suitable, for example for carrying a taphole cannon, the latter pivoting on the free End of the boom is stored. In a first version of this Taphole tamping machine is a rigid control rod articulated with the Taphole cannon and the support structure connected. This control rod attaches thus the alignment of the taphole cannon in a known manner Dependence of the swing angle of the boom fixed. Will the Swivel device, however, with the swivel arm described above equipped, so the control rod, instead of on the support structure, also on this swivel arm are articulated. In this case, the Control rod mounted an active actuator that allows the length of the Control rod to change so that the orientation of the Taphole cannon set regardless of the position of the boom can be.

In an alternative embodiment, the coupling device comprises one first coupling head at the end of the piston rod of the hydraulic cylinder and a second coupling head on the support structure. The two coupling heads are complementary to each other. Are in the working position of the boom the first and second coupling heads arranged in such a way that the first coupling head by extending the piston rod of the hydraulic cylinder on second coupling head can be supported. If the boom is out of its Working position swiveled towards the rest position, so the first comes loose Coupling head from the second coupling head and the hydraulic cylinder is now free pivotable with the boom. The boom advantageously has one spring-centered alignment device for the articulated on the boom attached hydraulic cylinder. This alignment device ensures that the hydraulic cylinder when swinging the boom into his Working position, always comes in a favorable coupling position.

Figur 1:

eine Draufsicht auf eine Stichlochstopfmaschine mit einer erfindungsgemäßen Schwenkvorrichtung, in Ruhestellung vor dem Hochofen;

Figur 2:

eine Draufsicht auf die Stichlochstopfmaschine der Figur 1, in Arbeitsstellung vor dem Hochofen;

Figur 3:

einen Schnitt entlang der Schnittlinie 3-3 der Figur 1;

Figur 4:

einen Schnitt entlang der Schnittlinie 4-4 der Figur 3;

Figur 5:

eine Schnitt wie in Figur 3, mit einer alternativen Verriegelungsvorrichtung, wobei letztere in entriegelter Stellung gezeigt ist;

Figur 6:

der gleiche Schnitt wie in Figur 5, wobei die Schwenkvorrichtung in verriegelter Stellung gezeigt ist;.

Figur 7:

eine Draufsicht wie in Figur 1, mit einer alternativen Ausgestaltung der Schwenkvorrichtung;

Figur 8:

eine Draufsicht wie in Figur 2, mit der Schwenkvorrichtung nach Figur 7;

Figur 9:

einen Schnitt entlang der gebrochenen Schnittlinie 9-9 der Figur 8.

Embodiments of the invention are described in more detail with reference to the accompanying drawings. Show it:

Figure 1:

a plan view of a tap hole tamping machine with a swivel device according to the invention, in the rest position in front of the blast furnace;

Figure 2:

a plan view of the tap hole tamping machine of Figure 1, in the working position in front of the blast furnace;

Figure 3:

a section along the section line 3-3 of Figure 1;

Figure 4:

a section along the section line 4-4 of Figure 3;

Figure 5:

a section as in Figure 3, with an alternative locking device, the latter being shown in the unlocked position;

Figure 6:

the same section as in Figure 5, wherein the pivoting device is shown in the locked position.

Figure 7:

a plan view as in Figure 1, with an alternative embodiment of the pivoting device;

Figure 8:

a plan view as in Figure 2, with the pivoting device of Figure 7;

Figure 9:

7 shows a section along the broken section line 9-9 of FIG. 8.

1 shows a taphole tamping machine 10 according to the invention a rest position in front of a blast furnace 12, which is shown schematically by a Circular arc is indicated. This taphole machine 10 consists in essentially from a swivel device 14 according to the invention and a known taphole cannon 16. The latter will not continue here described.

The pivoting device 14 comprises a columnar base 18, the one Forms support structure for a boom 20. Instead of as a base on the floor Of course, this support structure 18 can also be set up be hung up. The boom 20 is at one end in this support structure 18th pivoted. In Figure 1, the position of the pivot axis of the Boom 20 shown in the support structure 18 by the reference numeral 22. This axis 22 mostly towards the blast furnace relative to the vertical inclined. At the free end of the boom 20 is the tap hole cannon 16 hung pivotably. The location of the pivot axis of the Taphole cannon 16 in the boom 20 is indicated by the reference numeral 24 shown.

A relatively short, preferably double-acting hydraulic cylinder 28 is located immediately along the boom 20. One end of this hydraulic cylinder 28, in the shown version is the cylinder base, is by means of a first pivot 32 connected to the front end of the boom 20. For this purpose, the boom 20 advantageously has a lateral projection on which the first pivot 32 is attached. The second end of the hydraulic cylinder 28, in the embodiment shown it is the piston rod end connected to a swivel arm 38 via a second swivel joint 36. The latter is pivotally mounted in the support structure 18 so that its Pivot axis essentially coaxial with the pivot axis of the boom 20 is.

The bearing of the boom 20 and the swivel arm 38 are shown in FIG the support structure shown in more detail. The boom 20 points at his stored end on a cylindrical nozzle 40 which by means of a Ball bearing 42 is attached to a flange 44 of the support structure 18. The outer ring 46 of this ball bearing 42, i.e. the ring on which the socket 40 attached, forms a ring gear 48. With the reference numeral 50 is a Rotation motor called, for example, as a hydraulic motor or electric motor can be trained. This rotary motor 50 is attached to the flange 44 and can be engaged in the ring gear 48 by means of a pinion 52. The Rotary motor 50 can thus the rotatably mounted boom 20 around Swivel axis 22. The exact angular position of the boom 20 is detected when pivoted by an angle encoder 51. The latter is like that Rotary motor 50, attached to the flange 44 and in the ring gear 48 by means of a pinion 53 can be engaged.

At the upper end of the columnar support structure 18 is the swivel arm 38 mounted rotatably by means of a ball bearing 54. As can be seen from FIG. 3, is the inner ring 56 of the ball bearing 54 with a second flange 58 attached to the support structure 58 and the outer ring 60 to the pivot arm 38 attached. The ball bearing 54 is coaxial with the ball bearing 42 so that the Pivot axis 22 of the boom 20 is identical to the pivot axis of the Swivel arm 38 is.

The reference number 62 in FIG. 3 is global Locking device called. This locking device 62nd enables the swivel arm 38 to rotate on the support structure 18 lock. For this purpose, it comprises a locking bolt 64 which extends into an elongated hole 66 of an end plate 68 of the support structure 18 can be inserted and executed is (see also Figure 4). In a preferred embodiment, the Locking bolt 64 through the piston one on the swivel arm 38 attached short-stroke cylinder 70 is formed.

With the reference numerals 72, 74 are shown schematically in Figure 3, flexible hydraulic connection lines of the hydraulic cylinder 28 designated. This Hydraulic connection lines 72, 74 are advantageous via a rotary connection 76 integrated into a hydraulic circuit 78. The lower part of the slewing ring is attached to the support structure 18 in a rotationally fixed manner, the upper part to which the lines 72, 74 are connected, however, is freely rotatable.

In summary, it can be stated that the swivel device 14 at locked pivot arm 38, viewed kinematically, actually a is closed three-part swivel gear, the support structure 18th the frame, the boom 20 forms the driven link, and the Hydraulic cylinder 28 as a thrust member, the transmission between the support structure and Boom closes. In this closed, three-part slewing gear the length of the thrust link, i.e. the hydraulic cylinder 28, inevitably adapt to the position of the boom 20. In other words, the stroke of the hydraulic cylinder 28 should be when pivoting the boom 20 by the rotary motor 50, change continuously. When unlocked The swivel arm 38, however, is the hydraulic cylinder 28 from the swivel gear disengaged, i.e. the kinematic device is now considered kinematically open gear with the rotary motor 50 as the sole drive, or in other words, a change in the position of the boom is not necessary more necessarily a change in the stroke of the hydraulic cylinder 28. Swivel arm 38 and locking device 62 thus form one Coupling device, which is connected in series with the hydraulic cylinder 28 is, and with the help of which the hydraulic cylinder 28, when pivoting the Boom 20 by the rotary motor 50, from the slewing gear can be disengaged.

The operation of the above-described swivel device 14 is now described with reference to Figures 1 and 2. In Figure 1 is the Boom 20 with the tap hole cannon 16 in a rest position. The Piston rod of the hydraulic cylinder 28 is completely retracted. The Locking device 62 is unlocked, i.e. the hydraulic cylinder 28 is from the Swivel gear disengaged. If the rotary motor 50 is actuated, then the boom 20 from the rest position of Figure 1 in the working position of Figure 2 swung in. The freely rotatable swivel arm 38, which over the Hydraulic cylinder 28 is connected to the boom 20, is here with the Boom 20 pivoted in the direction of arrow 80. When swiveling the The boom in its working position is at a certain angular position of the boom 20 of the locking bolt 64 above the elongated hole 66 in the support structure 18. In this position, the short-stroke cylinder 70 can be actuated be, with the locking bolt 64, which had been retracted so far, in the Elongated hole 66 of the support structure 18 occurs and the position shown in FIG. 3 occupies. Extending the locking bolt 64 is advantageous here via the angle encoder 51, depending on the angular position of the boom 20, triggered. If the locking bolt 64 has been inserted into the elongated hole 66, so the piston rod of the hydraulic cylinder 28 can be extended. This causes the swing arm 38 to move in the opposite direction of the arrow 80 pivoted until the locking bolt 64 at a first termination 82nd of the elongated hole 66 in the support structure 18. In this position the Locking bolt 64 is the hydraulic cylinder 28, for transmitting one Contact pressure on the boom 20, integrated in the swivel gear. In in other words, the hydraulic cylinder 28 is supported via the swivel arm 38 and the locking bolt 64 on the support structure 18 to the Boom 20 exert a moment of force, causing the taphole cannon to the tap hole is pressed. To then tear off the stuffing gun 16 from the tap hole, the piston rod of the hydraulic cylinder 28 is retracted. Here, the locking bolt 64 first moves in the elongated hole 66 to he at a second end 84 of the elongated hole 66 in the support structure 18th is present. The hydraulic cylinder 28 is in this position of the locking bolt 64 in the swivel gear to transmit an opposing one Force moment integrated on the boom 20. In other words, it supports itself on the swivel arm 38 and the locking bolt 64 on the Support structure 18 to pivot the boom 20 away from the blast furnace 12. While the hydraulic cylinder 28 for pressing or tearing the Taphole cannon 16 is actuated, the rotary motor 50 is advantageous in Neutral. When the boom is subsequently swung out of its Working position, the locking bolt 64 is in a certain Angular position of the swivel arm 38 pulled out of the slot 66. Now the rotary motor 50 can extend the boom 20 into that shown in FIG Swing the rest position back without the hydraulic cylinder 28 must inevitably change its length.

The taphole cannon 16 is advantageously aligned with the taphole via a control rod. It could be a classic control rod Execution arrive with one end at a fixed point of the supporting structure 18 and is articulated at the other end to the taphole cannon 16 (see for example Figures 7 and 8). In Figures 1 and 2, however, is one novel control rod arrangement shown. It is a variable length control rod 90 with one end on the swivel arm 38 and is articulated at the other end to the taphole cannon 16. The length change of the control rod 90 takes place via a built-in Lift drive, for example a hydraulic cylinder 92 or a spindle drive. When pivoting the boom 20 from the rest position in the Working position, the length of the control rod 90 is determined by Pressurization of the hydraulic cylinder 92 changed synchronously. The Control rod 90 is based on the hydraulic cylinder 28 blocked swivel arm 38 from to the taphole cannon 16 to the To pivot pivot axis 24. This control rod assembly has essential advantages. First, it should be noted that control rod 90 is always is on the same side of the boom 20. In other words, at The control rod 90 does not have to pivot over the boom 20. This reduces the overall height of the machine. Second, it should be noted that the alignment of the taphole cannon when swiveling can be designed much more flexibly than with a classic Control rod. This is, for example, a comparison of FIGS. 1 and 7 can be seen that the machine of Figure 1 is a much more compact position than the machine of Figure 7. It should also be emphasized that at this version of the boom 20 a complete rotation around its Can execute pivot axis 22.

An alternative embodiment of FIG Locking device of the swivel arm 38 briefly explained. This Locking device comprises a pivot bolt 96 on the support structure 18 and at least one abutment 98 on the swivel arm 38. In FIG Swivel bolt 96 shown in the unlocked position of the locking device. In Figure 5, the pivot bolt 96 is shown in abutment on the abutment 98. In the abutment 98 can be easily integrated a shock absorber that Coupling the hydraulic cylinder 28 dampened in the swivel gear. It stays note that the pivoting device advantageously two angularly apart abutments, the pivot bolt when Press the tap hole cannon 16 on the first abutment and at Tearing the tap hole cannon 16 against the second abutment.

An alternative embodiment of the whole is shown in FIGS Coupling device of the hydraulic cylinder 28 described. This Coupling device includes a first coupling head 110 at the end of the Piston rod 130 of the hydraulic cylinder 128, and a second coupling head 112 on the support structure 18. The second coupling head 112, which is complementary to the first coupling head 110 is a fixed point on the Support structure 18 formed. In the working position of the carriage (see Figure 8), are the first and second coupling head 110, 122 to each other are arranged that the first coupling head 110 by extending the Piston rod 130 of the hydraulic cylinder 128 on the second coupling head 112 is supported. in this position the hydraulic cylinder 128 is for transmission a contact pressure on the boom 20 coupled into the swivel gear.

The hydraulic cylinder 128 is articulated on a projection 132 of the boom 20 attached. A lever 134 connects its pivot axis with one spring centered alignment device 136 on the boom 20. This Alignment device 136 aligns the disengaged hydraulic cylinder 128 in essentially parallel to the boom 20 and thus facilitates the coupling of the two coupling heads 110 and 112 in the working position of the boom 20.

In Figure 9, the two coupling heads 110 and 112 are engaged Position shown. It can be seen that the first coupling head 110 has two pins 140 ', 140 ", which is symmetrical to the axis 144 of the hydraulic cylinder 128 are arranged. In the engaged position, these pins 140 ', 140 "in corresponding storage troughs 142 ', 142 "(see FIG. 7) of the second Coupling head 112 mounted. Reference numeral 146 shows a hole in the first coupling head 110 through which a locking bolt 148 can be pushed through. With the help of this locking bolt 148, the first Coupling head 110 can be mechanically locked in the support structure, so that the hydraulic cylinder 128 also for tearing the tap hole cannon 16 from Tap hole can be used. The locking bolt 148 can for Example operated by a small hydraulic cylinder 150, which on the Support structure 18 is attached. Alternatively, however, the rotary motor 50 can also be used to tear the tap hole cannon 16 from the tap hole. The moment of force required for this is in fact much smaller than the moment of force required to press the tap hole cannon 16 becomes.

Finally, it should be noted that the pivoting devices described are particularly advantageous if a large swivel angle and a great pressure is required. Other advantages are their compactness and their low oil absorption. It should be noted that a low oil intake not only has a positive effect on the design of the hydraulic system, but in most cases also a positive influence on the Has energy consumption of the swivel device.

Claims (11)

1. Device for swivelling a working unit (16) between a rest position and an operating position, comprising:

   a jib (20) to carry the working unit;

   a supporting structure (18), in which the jib (20) is pivoted about a swivelling axis at one end;

   a rotary drive (50) between the jib (20) and supporting structure (18) for swivelling the jib (20) between its rest position and its operating position; and

   a hydraulic cylinder (28) between jib (20) and supporting structure (18) to generate a contact force;

   the supporting structure (18) representing the frame and the jib (20) the driven element of a gear and the hydraulic cylinder (28) closing this gear between supporting structure (18) and jib (20) to transmit the contact force to the jib (20); and

   a coupling device, which is connected in series to the hydraulic cylinder (28) in such a way that the hydraulic cylinder (28) can be disconnected from the gear;

   characterised in that
   the hydraulic cylinder (28) is arranged along the jib (20), is carried by the latter and can be supported on the supporting structure (18) via the engaged coupling device to transmit a contact force.
2. Device according to claim 1, characterised in that the coupling device comprises the following parts:

   a swivelling arm (38), which is pivoted in the supporting structure (18) in such a way that the swivelling arm (38) is pivoted in relation to the supporting structure (18) and the jib (20) about a swivelling axis, which is essentially coaxial with the swivelling axis of the jib (20), the hydraulic cylinder (28) being connected to the swivelling arm (38); and

   a locking device for locking the swivelling arm (38) in relation to the supporting structure (18).
3. Device according to claim 1 or 2, characterised in that the locking device has a bolt (64), which can be inserted in and withdrawn from a corresponding oblong hole (66) to lock the swivelling arm (38) in relation to the supporting structure (18).
4. Device according to claim 3, characterised in that the locking device has a short-stroke cylinder (70) for insertion and withdrawal of the bolt (64).
5. Device according to claim 2 or 3, characterised in that the locking device has a swivelling locking bar (96), which in order to lock the swivelling arm (38) can be swivelled into a position in which it rests against an abutment (98) when the swivelling arm (28) is in the operating position.
6. Device according to claim 5, characterised in that the abutment (98) comprises a shock-absorber.
7. Taphole plugging machine comprising a swivelling device according to one of claims 2 to 6, a taphole gun (16), which is pivoted at the free end of the jib (20), and a control rod (90), which is flexibly connected to the taphole gun (16) and the swivelling arm (38), the control rod (90) having an actuating drive (92) for adjustment of its length.
8. Device according to claim 1, characterised in that the coupling device comprises the following parts:

   a first coupling head (110) at the end of the piston rod of the hydraulic cylinder (128),

   a second coupling head (112) complementary with the first one on the supporting structure (18),

   the first and second coupling head (110, 112) being arranged in relation to each other in such a way when the jib (20) is in the operating position that the first coupling head (110) can be supported on the second coupling head (112) by withdrawal of the piston rod of the hydraulic cylinder (128).
9. Device according to claim 8, characterised by a spring-centered aligning device for the hydraulic cylinder (128) pivoted on the jib (20).
10. Device according to claim 8 or 9, characterised by a locking device (146, 148, 150), which is assigned to the two coupling heads (110, 112) in such a way that the first coupling head 110 can be locked mechanically in the second coupling head.
11. Taphole plugging machine comprising a swivelling device according to one of claims 1 to 10 and a taphole gun (16), which is pivoted on the free end of the jib (20).

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