JPH05132706A - Method of inserting boring rod into tap hole of blast furnace, boring machine and b-directional clamp - Google Patents

Abstract

PURPOSE: To provide a method and a device for executing the boring of a tap hole without using a hammer in the case of using a consumable rod or in the case of pulling out or inserting a boring rod.

CONSTITUTION: A clamp 46 fitted to a frame 26 can be shifted in the longitudinal direction on the frame by acting a hydraulic jack 42 fitted in the front part of the frame 26. After inserting the rod 22 through the clamp 46, the jack 42 and the clamp 46 are driven, and the rod is advanced by using the clamp 46 by the length corresponding to the stroke of the jack 42. Successively, the clamp 46 is opened and the rod is returned back to the original position. These operations are repeated until the necessary length of the rod 22 pushes into the tap hole.

COPYRIGHT: (C)1993,JPO

Description

Detailed Description of the Invention

The present invention relates to a method for inserting a boring rod into a tap hole of a blast furnace before the plugging block previously injected into the tap hole has completely hardened, for connecting to the free end of the rod. A working tool movable along a frame supporting against a blast furnace wall, the frame being acted on by a hydraulic jack mounted on the frame and axially aligned with the coupling device; Relates to a method implemented by a boring machine consisting of a crank which is movable in the longitudinal direction. The present invention also relates to a machine for inserting and withdrawing a boring bar into and out of a tap hole, as well as a bidirectional clamp that may be used with such a machine.

The present invention therefore relates to the now known extinction rod method in which after closing a tap hole with a block, a metal rod is pushed into it before the block has completely hardened. Therefore, the opening of the tap hole is by pulling the rod out of the hardened block at the desired moment.

The machine used to implement the method is a conventional boring machine, but with the appropriate adaptations and modifications. In fact, occasionally, by conventional means,
For example, it is necessary to reserve the possibility of boring in order to correct or move the shape of the tap hole, or when the extinction rod cannot be adopted.

The working members of these machines are therefore not only the boring machines which are in fact used occasionally,
It must consist of a chuck with interlocking clamps and a powerful two-way pneumatic hammer to exert the force necessary to insert and pull out the extinction boring bar. In fact, the pulling out of the rod is, among other things, a manual task, but the insertion is a task of force, skill and efficiency.

This is a manual work, that is, in order to insert the rod, it is necessary to wait until the closed mass reaches a certain degree of hardness and exhibits the necessary strength and supporting force for the rod. Because.

It is also a skilled task. This is because the rod must be pushed in before the block has completely set. However, because of the resin-based occlusion masses currently used, their coagulation is strong and rapid and needs to be adapted. On average,
The rod must be put in place about 3 to 10 minutes after the tap hole is blocked, depending on the quality of the plugging mass used.

Finally, the operations and means employed must be efficient. The reason for this is that even a minimal failure, that is, an erroneous operation, will delay or prevent the rod insertion operation. Therefore, there is a risk that the rod will remain stuck in the middle as a result of premature hardening of the block. In order to correct such an extremely harmful condition, there is no choice but to burn the part of the rod buried in the hardened mass.

A two-way pneumatic hammer appears to be a suitable tool to meet these requirements, and the fact that it has always been used to insert and pull rods proves this in the past. It seems that Unfortunately, it's not like this. For such a hammer is not without its drawbacks. First,
Firstly, this hammer puts considerable stress and vibration on the device, in particular its chuck for connecting with the rod as well as its clamps, so that they are subject to rapid wear and frequent Need replacement. And this hammer is extremely noisy and, of course, exceeds current tolerances which tend to be more and more severe.

French patent 2619036 and European patent 01
28432 proposes a noiseless hydraulic means for withdrawing the boring bar, partly remedying these drawbacks.
Air hammers no longer need to be bi-directional,
Nevertheless, it is still necessary, for the purpose of efficiently and quickly placing the boring bar in place.

Proposed in document EP-A2-0379018 is a quick method of pulling out the rod in several steps by the back and forth movement of the clamp under the action of a hydraulic jack. Unfortunately, as in the two documents above, an air hammer is still needed for the insertion of the boring bar.

The various devices proposed by each of the above documents all have orientations in the direction of the tap holes to force the boring bar into the semi-hardened block during the insertion phase to help eliminate impact. Instead of a one-way hammer for advancing the work tool along the frame, more powerful means, for example pneumatic, can be applied to the work tool. Unfortunately, this enterprise cannot be built. Because of the length of the rod, a stronger thrust would be, without the hammer, first to bend the rod, then to the rod in the partially pushed position into the rapidly hardening mass. This would pose the risk of causing a definite sticking of.

An object of the present invention is to use an extinguishing rod,
It is an object of the present invention to provide a new method and a new device that allow the boring bar to be completely hammered out, whether it is pulled out or inserted.

To this end, the features of the method proposed by the invention are essentially the jack and clamp after the boring rod has been threaded through the clamp and vice versa, after it has been connected to the working tool. Is driven by the clamp to advance the rod by a length corresponding to the stroke of the jack, the clamp is opened and returned to its initial position, and such an operation is required for the required length of the rod. Is repeated until it is pushed into the tap hole.

The reverse operation is adapted to pull out the rod, and the pneumatic hammer can be omitted altogether to apply the extinction rod method. Furthermore, since the clamp is designed to slide on the front end of the frame, the distance to the tap hole is relatively short, so there is no risk of bending the rod during forced insertion.

The present invention can also be used to withdraw or insert a boring rod from a tap hole in a blast furnace, with means for connecting to the free end of the rod to support the wall of the blast furnace. A work tool that is movable along the frame, a clamp that is axially aligned with the coupling device and that is mounted on the frame and that is movable longitudinally with respect to the frame under the action of a hydraulic jack mounted on the frame. The present invention relates to a boring machine, wherein the clamp is a bidirectional clamp that operates in one direction or the opposite direction under the action of operating air or hydraulic oil.

The invention also comprises two pairs of jaws designed for such a machine and arranged symmetrically with respect to an axial groove capable of receiving a boring bar and movable obliquely with respect to said groove. , The pair of jaws on the blast furnace side is also directed towards the front for pulling out the rod and the pair of jaws on the opposite side is also directed towards the rear towards the rear for inserting the rod.

The jaws of each pair are driven by the hydraulic oil of the jack through the pneumatic change valve so that the pair of jaws of each pair is constantly braked while the jaws of the other pair are driven, and The reverse can also be the same.

According to another embodiment, the bidirectional clamp consists of two reversing jaws which are parallel to each other and can be moved obliquely with respect to the axial grooves passing through their receiving blocks. There is.

The chin split used when pulling out the rod is preferably on the blast furnace side and the chin split used when inserting the rod is therefore preferably on the opposite side. is there.

The axial grooves preferably consist of two supports, diametrically opposed to each other in the chin split so as to co-operate with the chin during their use.

Each jaw may also be braked by one jaw while the other jaw is being driven, and may be driven by the hydraulic oil of the jack through an air pressure change valve which is vice versa. it can.

The front part of the frame of the boring machine preferably consists of a support which coacts with the wall of the blast furnace both in thrust and in tension in order to absorb the counter-recoil.

Both the first and the second embodiment of the clamp are preferably radial grooves, the bottom of which is constituted by an axial groove and which is open towards the outside of the block in a direction perpendicular to the plane of the chin. It consists of a chin-accommodating cylindrical block along the entire length of the chin. This design allows the bar to laterally engage the clamp. To facilitate this engagement, it is further preferred that the walls of the open groove converge towards the interior of the block.

In order to facilitate the cleaning and removal of dust, it is further preferred that the jaws are arranged laterally with respect to the axial groove and that said groove is opened downwards.

According to a third embodiment, the clamp consists of two pairs of jaws in the same receiving block in a cruciform arrangement, two jaws of each pair being the axial grooves of the receiving block. Symmetrically about and obliquely movable with respect to the groove, one pair of the jaws of each pair is oriented forward for the withdrawal of the rod, the other pair of jaws of the rod is It is oriented backwards for insertion.

Other details and features will be apparent from the detailed description of some characteristic embodiments disclosed below with reference to the accompanying drawings, for the purpose of illustration.

FIG. 1 shows an overall side view of a boring machine for implementing the method proposed by the invention.

FIG. 2 shows one phase of the insertion of the boring rod by the machine according to FIG.

FIG. 3 shows another phase of the insertion of the boring rod by the machine according to FIG.

FIG. 4 shows the boring bar in orientation after the insertion phase,

FIG. 5 shows an axial section in which the first embodiment of the bidirectional clamp is cut and shows one phase of operation during insertion of the boring rod,

FIG. 6 shows an axial section in which the first embodiment of the bidirectional clamp is cut and shows another phase of operation during insertion of the boring rod,

FIG. 7 shows an axial section through a first embodiment of the bidirectional clamp, showing a further phase of operation during cutting and insertion of the boring rod,

FIG. 8 shows one position of the same bidirectional clamp during withdrawal of the boring bar,

FIG. 9 shows another position of the same bidirectional clamp during withdrawal of the boring bar,

FIG. 10 shows an axial cross section of a second embodiment of the bidirectional clamp,

FIG. 11 shows one advantageous embodiment of the clamp with open groove,

FIG. 12 shows another advantageous embodiment of the clamp with open groove,

FIG. 13 shows diagrammatically a third embodiment of the bidirectional clamp along the plane AA of FIG.

FIG. 14 diagrammatically shows, in another phase, a third embodiment of a bidirectional clamp along the plane AA of FIG.

FIG. 15 shows a similar view of the third embodiment along the plane cut along BB of FIG.

FIG. 16 shows a similar view of the third embodiment along the plane BB of FIG. 17 in another phase,

FIG. 17 shows an axial view of the third embodiment,

FIG. 18 shows an axial view of the third embodiment in another phase.

The machine shown in FIGS. 1 to 4 is apparently similar to the machine proposed in document EP-A2-0379018. This is because the tap hole of the blast furnace 20 depicted by a part of the furnace wall is formed by conventional boring,
Alternatively, as shown in the figure, the machine is designed to be opened by pulling out the rod 22 fixed to the hardened block of the tap hole 24. The machine is supported by the end of a support arm 28 and comprises a frame 26 which allows the bracket (not shown) to be pivoted between an operating position 20 as shown in the figures and a parking position spaced from the tap hole. ing. The work tool 30 is slidably mounted on a movable trolley 32 supported on the frame 26. Although not shown, the working tool 30 is supplied with working air or working oil by a connecting pipe capable of following its movement.

On the front side of the work tool 30, means 36 for connecting the tool 30 to the free end of the rod 22 are arranged. This connecting means may be as described in French Patent No. 2520827 or 8212052.

An intermediate support 38 is also slidably mounted on the frame 26 and serves as an intermediate support for the rod 22.

The reference number 34 designates a support designed as a male and a female element, provided for example on the blast furnace wall and on the front end of the frame 26 and vice versa, respectively, for inserting and withdrawing the rod 22. In this case, it is for absorbing the recoil or the opposing recoil. The lock 40 allows this support to be fixed in the pulling direction to the blast furnace wall. If the machine can be moved vertically, the support may consist of hooks, in which case the lock 40 can be omitted.

A hydraulic jack 42 is further arranged in front of the frame 26, and a rod 44 of the hydraulic jack 42 is attached to the frame 26.
It is movable in the longitudinal direction. The end of the piston rod 44 is connected to a clamp 46 that can slide between the two rails forming the frame 26 and that can grip the boring rod 22.

The machine described so far is based on the above-mentioned document EP.
It serves to fulfill the pull-out method of the rod 22 by alternating movement as described in A2-0379018. However, the clamp operates only in one direction, in which case the withdrawal direction is opposite to the present document, which is in the right direction in the figure, whereas the clamp 46 according to the present application is only in both directions, i.e. for withdrawing the rod. Rather, it is actively used to insert and orient it in the plugged mass of tap hole 24.

For this purpose, the boring bar 22 is
It is preferably placed already in the parked position, or in the orientation shown in FIG. 1 on the machine before occupying the working position of the machine shown in FIG. The rod 22 then leans against the support 38 and
While being engaged with the clamp 36 of the work tool, the clamp 46 is fitted in the clamp 46 in the axial direction.

When the rod 22 extends to the front end of the frame, it is not necessary to thread it axially through the clamp, so an open clamp can be used to laterally engage the rod with the clamp, as described below. Preferably. On the other hand, if the rod 22 is shorter or the frame is longer, the clamp 46 is advanced enough to fit the rod 22 into the chuck 36 and place it on the support 38 in the overhanging position. And the clamp 46 can be axially engaged with the enclosure of the rod while moving backwards, thus making the clamp a closed clamp.

To insert the rod 22 into the tap hole,
The clamp 46 is pneumatically driven to grip the rod 22 and the jack 42 is driven to release the rod,
The clamp 46 is moved to the left until it reaches the position shown in FIG. The clamp 46 is then opened and the rod 44 of the jack 42 is retracted to lock the open clamp, now by inertia or trapped, at the entrance of the tap hole 24 to the semi-hardened block. Move backwards along 22.

When the clamp 46 returns to the position of FIG. 1, the back and forth movement is repeated as many times as necessary to push the rod into the home position shown in FIG.

When the rod is inserted, the frame 26 is attached to the blast furnace 2
It is preferable to fix it to the 0 wall. It suffices for this purpose that the lock 40 be engaged manually or by an automatic device to ensure a male-female connection at the level of the support 34. By this fixing, the opposing reaction force to the right can be absorbed when the rod 22 is pushed in by the action of the jack 42. Once the rod is inserted,
The lock 40 is raised, the support 34 is released from the blast furnace wall and the machine is pulled back to the parked position and the rod 22 is shown in FIG.
It can be left in the position shown in.

To open the tap hole, the machine is returned to its working position and the rod 22 is attached to document EP-A2-0379.
Using the known method recommended at 018, pull out from the position of FIG.

In order to be able to adopt this advantageous method for inserting and withdrawing a boring rod without the obligation of using an air hammer, it is possible to pull the rod in one direction and in the opposite direction. It is necessary to have a clamp and a means for driving the clamp in a suitable way, but without the two functions interfering with each other.

Of course, a unidirectional clamp could be devised which must be inverted after each operation for inserting the rod to pull it out and vice versa. However, this requires removing the clamp bolts each time,
Or the need to provide a bodywork that can be rotated by remote control, which results in a weak clamp installation, complicated mounting and, in addition, almost recommended in this location where it is exposed to splashes of molten material. Can not.
Therefore, it is preferable to provide a bidirectional clamp, some implementations of which will be discussed later.

Shown in the following figures is an advantageous embodiment of such a bidirectional clamp. The first embodiment shown in FIG. 5 consists of a first pair of jaws 50 and a second pair of jaws 52, each pair being welded together or otherwise joined together in a clamping unit. Twin clamps 46 that are enclosed in receiving blocks 54a, 54b, respectively, to form device 54. Each of the four jaws is constructed in a manner known per se by a bar 56 having a split 58 at the inner end and a piston 60 at the outer end. The axes of all four jaws are angled at the same acute angle with respect to the groove 62 designed to axially pass through the block containing them and to receive the rod 22. This gradient contributes to the fact that under tension the cracks automatically bite into the rod 22. Piston 6 on each jaw
0, on the other hand, is opened by the spring 64 and the crack 5
8 in the direction of releasing contact with the rod 22 and, on the other hand, by a pneumatic device in the direction of closing and against the action of the spring 64 in the direction of engaging the split 58 with the rod 22. The pneumatic control device for the jaw may be driven by the pneumatic device of the jack 42 with a pneumatic change valve (not shown) interposed.

The individual jaws of each pair 50, 52 are therefore
They are arranged symmetrically with respect to each other with respect to the axis of the groove 62, while the two pairs are in symmetrical relation to each other with respect to one vertical plane, forming a rhombus, as seen from above. This makes it possible, inter alia, to reverse the clamps so that the jaws for withdrawing the rod become insertion jaws and vice versa.

The housing blocks 54a and 54b are provided with plates 66a and 54a, respectively, on their free front sides, which are provided with openings for diverging around the groove 62 so as to facilitate the entry of the rod 22.
66b is provided.

In the illustrated embodiment, the jaw 52 is driven to the left in the drawing so as to push the rod into the tap hole, as shown in FIG. At its end,
The clamps 46 and jaws 52 open due to the release of air pressure on their pistons 60, and due to the action of their springs 64 that can return the clamps to the position of FIG. 6 by the action of the jack to the right. , The rod 22 remains stopped. The jaw 52 is then driven again (see FIG. 7), pushing in the rod a further length corresponding to the advance of the clamp 46.

The pneumatic controller design is such that the chin 50 remains inactive during the repetition of the operation shown in FIGS. 5-7 to counteract the forward movement of the rod 22 due to the rearward movement of the chin 50. Must be prevented.

The roles in pulling out the rod shown in FIGS. 8 and 9 are opposite. The jaw 50 will now be driven to grip the rod 22 and carry it to the right to the position of FIG. Then open the chin 50 and move the clamp to the left,
And it will release the rod for an additional length corresponding to the advance of the clamp. It is the jaw 52 that is inactive during this withdrawal.

Instead of the configuration shown in FIGS. 5 to 9, the jaws can be arranged in an "X" shape, in which case the position of the insertion jaws is on the blast furnace side. However, the configurations shown in these figures deserve selection. Because if the insertion jaws are located at the rear of the extraction jaws, we can always be sure that the extraction jaws will no longer push the rod out of the limit where it can no longer be grasped. is there.

Shown in FIG. 10 is one embodiment of a more compact clamp, one jaw 72 for withdrawing the rod 22.
And one jaw 74 for its insertion. These two jaws are in opposite directions, parallel to each other,
With respect to the groove 76 penetrating those housing blocks 78,
It is arranged with a certain inclination angle.

The clamp 70 functions similarly to the clamp 46 of the embodiment described above. However, in order to compensate for the absence of the second jaw, the axial groove 76 is fitted in each jaw 7
Opposite 2,74 are supports 72a, 74a designed to cooperate with a moving jaw to grip the rod 22. These supports 72a, 74a may be flat as shown or may be ridged to improve gripping of the rod.

FIG. 11 shows an axial view of the clamp 70 according to FIG. The clamp 70 is, for example, threaded and is fixed on a block 80 driven by the rod 44 (FIG. 1) of the piston 42 and the two beams 26a, 26b forming the frame 26. It is designed to slide between.

According to an advantageous embodiment, the axial groove 7
6 forms the open longitudinal direction, the bottom of the radial groove 86. The groove 86 allows the rod 22 to be laterally engaged with the clamp 70 and further facilitates the internal cleaning of the clamp. Each wall of the groove 86 is
It is preferably spread out from the inside to the outside, which makes the engagement of the rods 22 even easier.

In the embodiment of FIG. 11, the jaw is lateral to the groove 76, while the groove 86 is open downwards.

In the variant shown in FIG. 12, the jaws are provided above and below the groove 76 which is open laterally via the groove 88.

FIG. 11 has the advantage that dust is easier to clean, while FIG. 12 has the advantage that the rod 22 is easier to engage.

Clearly, both the variants of FIGS. 11 and 12 are equally suitable for the twin clamps of FIGS. 5-9.

Shown in FIGS. 13-18 is a third embodiment of the clamp, which is an compromise between the embodiment of FIGS. 5-9 and the embodiment of FIG. FIG.
14 and 14 show two jaws 80, 82 for insertion of the rod 22 in the closed and open positions, respectively, along the AA cross section of FIG. 17, while FIGS.
Shows two withdrawal jaws 84, 86 in the closed and open positions, respectively, along the cross section of FIG.

The feature of this third embodiment is that two pairs of jaws,
80, 82 and 84, 86 are housed in the same housing block 88 and form a cross-shaped arrangement as shown in FIG. 17, which is seen from the left in FIGS. 13 to 16. An axial view of the clamp is shown with the two withdrawal jaws 80, 82 and the insert jaws 80 ', 82' shown in broken lines. FIG. 18 is a view similar to FIG. 17, showing the cracks in the insertion jaws 80 ', 82' around the boring bar 22. The two pairs of jaws 80,82 and 80 ', 82' must necessarily be oriented in opposite directions to allow rod insertion and withdrawal. Alternatively, the configuration is perfectly symmetrical with respect to the longitudinal axis, as the clamps can be inverted so that the insertion jaws become extraction jaws and vice versa if necessary. Therefore, this third embodiment has the advantage of gripping the rod 22 with two jaws like the first embodiment as shown in FIGS. 5 to 9, while it has the advantage of the clamp of the embodiment shown in FIG. It offers the advantage of being small.

[Brief description of drawings]

1 is an overall side view of a boring machine for implementing the method proposed by the present invention.

2 is one insertion phase of a boring rod with a machine according to FIG.

3 is another insertion phase of the mechanical boring bar according to FIG.

FIG. 4 is a bowling rod in orientation after the insertion phase.

FIG. 5 is an axial sectional view of the first embodiment of the bidirectional clamp and showing one operating phase during insertion of the boring rod.

FIG. 6 is an axial cross-sectional view of the first embodiment of the bidirectional clamp and showing another operating phase during insertion of the boring bar.

FIG. 7 is an axial cross-sectional view of the first embodiment of the bidirectional clamp and yet another phase during insertion of the boring rod.

FIG. 8 is one position of the same bidirectional clamp during withdrawal of the boring bar.

FIG. 9 is another position of the same bidirectional clamp during withdrawal of the boring bar.

FIG. 10 is an axial cross section of a second embodiment of a bidirectional clamp.

FIG. 11 is one advantageous embodiment of a clamp having an open groove.

FIG. 12 is another advantageous embodiment of a clamp having an open groove.

13 is a diagrammatic view of a third embodiment of the bidirectional clamp along the AA cross section of FIG.

FIG. 14 is a diagram of another phase of the third embodiment of the bidirectional clamp along the AA cross section of FIG. 17;

FIG. 15 is a similar state of the third embodiment taken along section BB of FIG.

16 is a view of the same other phase of the third embodiment taken along the line BB of FIG.

FIG. 17 is an axial state of the third embodiment.

FIG. 18 is a state of another phase in the axial direction of the third embodiment.

[Explanation of symbols]

 20 Blast Furnace 22 Rod 24 Tap Hole 26 Frame 28 Support Arm 30 Work Tool 32 Movable Trolley 34 Support 36 Chuck 38 Support 40 Lock 42 Jack 44 Jack Rod 46 Clamp

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jiyan Metz, Luxembourg Country Luxembourg, Liu, EN. S. Pierre 47 (72) Inventor Patritsk Milan Luxemburg Country Fouenanjiu, Ryu, de, Siampu 2

Claims (15)

[Claims] 1. A boring rod is provided in a tap hole of a blast furnace,
A method of inserting a pre-filled closed mass into this tap hole before it has completely hardened, the wall of the blast furnace (20) provided with means (36) for connecting to the free end of the rod (22). A work tool (30) that is movable along a frame (26) that is supported against, is mounted on the frame (26) in axial alignment with the connecting device (36) and is mounted on the frame (26). In a method implemented by a boring machine consisting of a clamp (46) which is movable longitudinally with respect to the frame (26) under the action of an installed hydraulic jack (42), a rod (22) is passed through the clamp (46). Or vice versa, after connecting with the working tool (30), the jack (42) and the clamp (46) are clamped by the clamp (46) by a length corresponding to the stroke of the jack (42). Actuated to advance the rod, the clamp (46) is opened and returned to its initial position, and such operations are repeated until the required length of said rod is pushed into the tap hole A method characterized by. 2. A work tool (3) movable along a frame (26) which bears against the wall of the blast furnace (20) with means (36) for connecting to the free ends of the rods (22).
0), mounted on the frame (26) in axial alignment with the coupling device (36) and under the action of a hydraulic jack (42) mounted on the frame (26).
6) In a blast furnace tap hole boring machine consisting of a clamp (46) which is movable in the longitudinal direction with respect to 6), the clamp (46) is a bi-directional clamp that operates in one or the other direction under the action of working air or hydraulic oil. A boring machine characterized by being present. 3. The front part of the frame (26) has a blast furnace (2
3. Machine according to claim 2, characterized in that it comprises a support (34) cooperating with the wall of (0) in both the axial and the tensile direction. 4. A lock (4) in which the support is manually driven.
Machine according to claim 3, characterized in that it can be fixed to the furnace by means of 0). 5. The clamp comprises two pairs of jaws (50), (52) arranged symmetrically about the axial groove (68) and slidably movable with respect to the groove (68),
A bidirectional clamp characterized in that the pair of jaws on the furnace side are oriented forward to pull the rod out and the jaws on the opposite side (52) are oriented rearward for insertion of the rod (22). 6. The jaws (50), (52) of each pair are driven by the hydraulic oil of the jack (42) via a pneumatic change valve, and the pair of pairs (50), (52) is constantly braked. 6. A clamp as claimed in claim 5, characterized in that the other pair is driven while it is being driven and vice versa. 7. Two inverted jaws (72), (7) in which the clamps can be moved parallel to each other and obliquely into an axial groove passing through their receiving blocks (78).
4) A bidirectional clamp, characterized in that 8. In the case of withdrawal of the rod (22) the jaw crack in use is on the furnace side and in the case of the insertion of the rod (22) the jaw crack in use is on the opposite side. The clamp according to claim 7, which is characterized in that: 9. The axial groove (76) has a jaw (72),
The clamp according to claim 7, characterized in that it comprises two supports (72a), (74a) facing each other in the diametrical direction in the split of (74). 10. A jack (42), wherein each jaw (72), (74) brakes the other jaw when one jaw is being driven and vice versa. The clamp according to claim 7, which is driven by hydraulic fluid. 11. The clamp has an axial groove (7) at the bottom.
6) and formed by the jaws (72), (74)
Cylindrical block (78) for accommodating the jaw provided along the entire length of the radial groove (86) which is open to the outside of the block (78) in a direction perpendicular to the fissure.
The clamp according to claim 5, wherein the clamp comprises: 12. Each wall of the groove (86) has a block (7).
The clamp according to claim 11, which converges toward the inside of 8). 13. The jaws (72), (74) are arranged laterally with respect to the axial groove (76) and the groove (86) is open downwards. The clamp according to claim 11, wherein: 14. A pair of jaws (80, 8) in which the clamps are arranged in a cross shape and are located in the same receiving block (88).
2) and (84,86), two jaws of each pair being symmetrically arranged with respect to the axial groove of the receiving block (88) and oblique to said groove. It is movable and one of the pair of jaws (84, 86) is
2) characterized in that it is oriented forward for pulling out 2) and that the other pair of jaws (80, 82) is oriented backwards for inserting the rod (22). Direction clamp. 15. A pair of jaws (80, 82) and (84,
86) is driven by the hydraulic oil of the jack (42) via the air pressure change valve, and one of each pair (80, 82)
15. Clamp according to claim 14, characterized in that or (84, 86) is always braked while the other pair is driven and vice versa.