Sliding closure for a container containing molten metal

Abstract

The invention relates to a sliding closure for a container containing molten metal, having a slide housing (12), a slide unit which is longitudinally guided in the slide housing and comprises a push rod (13), a mounting (15) on the slide housing (12), and a linear drive (20) which can be secured to the mounting (15) and comprises a drive rod (20') that can be coupled to the push rod (13). The linear drive (20) can be pushed into the mounting (15) on the slide housing (12) and can be removed therefrom preferably transversely to the adjustment direction of the linear drive and can be locked in the mounting (15). At least one respective locking means (25, 30) is secured to the linear drive (20) and to the mounting (15), said locking means being designed to interact such that an automatic locking of the linear drive (20) is carried out after or while the linear drive is pushed into the mounting (15). In this manner, a permanently secure attachment of the linear drive in the mounting is produced.

Description

[0001]

[0002] Sliding closure for a container containing molten metal

[0003] The invention relates to a sliding closure for a container containing molten metal, wherein the sliding closure has a slide housing, a slide unit guided longitudinally therein with a push rod, a holder on the slide housing and a linear drive which can be fastened in this holder and has a drive rod which can be coupled to the push rod, wherein the linear drive can be inserted into the holder on the slide housing, preferably transversely to its adjustment direction, and can be removed from this holder and locked in the holder.

[0004] A known sliding closure for a vessel containing molten metal according to the document EP 3 424 618 comprises a slide housing, a slide unit guided longitudinally therein with a push rod, a holder on the slide housing, and a linear drive insertable into this holder with a drive rod which can be connected to the push rod of the slide unit by a coupling. This coupling is designed such that, when the flange of the linear drive is inserted into a lateral recess in the holder, it couples against the slide unit by sliding the drive rod. The coupling has a coupling part at the end of the push rod and a coupling part at the front end of the drive rod of the linear drive, which couple against the push rod when the drive rod is moved.

[0005] A locking device is provided which can be actuated by the linear drive and interacts with the holder, by means of which the linear drive can be fixed in the holder after being inserted into the holder or unlocked again before being removed. The linear drive has a hydraulic cylinder, a main piston which drives the drive rod in the main piston, and an auxiliary piston which can be moved independently of the main piston for actuating the locking device. This auxiliary piston is provided with a locking head guided on the drive rod which, when the auxiliary piston is acted upon in the locking direction, can be moved out of the interior of the hydraulic cylinder at the front and can preferably be inserted in a form-fitting and / or force-fitting manner into a correspondingly shaped recess in the holder of the hydraulic cylinder, while it can be removed from the recess when the auxiliary piston of the locking device is acted upon in the unlocking direction.This lateral recess is formed in the bracket and in the recess formed within it, whereby the coupling can be automatically disengaged when the linear drive is removed from the bracket transversely to the direction of travel of the drive rod. This locking device enables automated coupling of the linear drive in the bracket, but the use of a main piston and an additional, independently movable auxiliary piston in the linear drive proposes a relatively complex design solution.

[0006] The document US 2010 / 0199566 discloses a locking device in a holder for a linear drive, which consists of a locking rod and a locking claw that interacts with it. The locking rod is attached to a flange of the drive rod of the linear drive and is aligned axially parallel to the drive rod. The locking claw is mounted transversely to the locking rod in the holder. The locking rod has two recesses designed as annular grooves that correspond to the end positions of the drive rod. The diameter of the annular groove is dimensioned such that when the linear drive is inserted into the holder with the drive rod retracted, the annular groove can engage in the locking claw, while it can be released from the locking claw when the linear drive is extended.When the drive rod is moved, the locking rod connected to it is also moved, whereby the locking claw engages around this locking rod in the area between the annular grooves so that the locking rod and with it the linear drive cannot be released from the locking claw transversely to its longitudinal axis.

[0007] Document CN 110394621 discloses a method for repairing a sliding gate valve. A slide plate oil hydraulic unit is provided for adjusting the slide plate. The linear drive, which can be moved by a robot, can be pushed laterally into the holder. For this purpose, corresponding retaining grooves are formed in the holder, into which a retaining ring of the cylinder can be inserted. Connection lines can be connected by placing the plug connection on the one hand in the mounting seat of the holder and on the other hand on the block at the front below the cylinder. After the cylinder has been installed, the two lines can be plugged together using a pressure lever. This pressure lever is pivotally held by an adjustment drive attached to the clamping device of the robot and is actuated by an external force with this separate adjustment drive, which must be controlled externally.

[0008] According to WO 2017 / 033953, a drive unit is provided with a rectangular base plate and a push rod with a front-mounted coupling. The drive unit is releasably held on a drive unit holder by inserting the front side of the base plate into grooves in the drive unit holder.

[0009] The invention is based on the object of improving the known sliding closure in such a way that its maintenance on the container for casting is automated and made possible with structurally simple means, and the operational reliability of the sliding closure during casting is increased.

[0010] This object is achieved according to the invention in that at least one locking means is provided, preferably fastened, on the linear drive and on the holder, which locking means are designed to cooperate in such a way that the linear drive is automatically locked into the holder after it has been pushed in or during the pushing in, preferably at the end of the pushing-in process.

[0011] This inventive arrangement of at least one locking device on the linear drive and on the holder, by means of which the linear drive is automatically locked into the holder after insertion or during insertion, preferably at the end of the insertion process, results in a permanently secure fastening of the linear drive in the holder. The automatic locking can prevent movement of the linear drive counter to the insertion direction and, depending on the design, can also prevent (further) movement of the linear drive in the insertion direction, whereby the insertion process can be terminated by the automatic locking.

[0012] Advantageously, the linear drive can be unlocked in the holder, with an adjustment element that can be operated manually or by a manipulator being provided for unlocking the holder. This allows the linear drive to be released using a simple mechanism that also ensures secure locking without disruption. This ensures locking at all times, even in the event of operational vibrations or impacts on the sliding closure, and permanently prevents the linear drive from becoming detached from the holder.

[0013] Advantageously, one locking means comprises a displaceable locking element with a front part, wherein this front part engages into a recess of the other locking means during locking such that this locking occurs, wherein the locking element is preferably adjustably mounted transversely to the insertion direction of the linear drive. This design of the cooperating locking means achieves a locking effect that is non-releasable during operation.

[0014] The locking means of the linear drive expediently comprises a capsule housing, a locking element displaceable therein, and a spring element, wherein the locking element with its front part can be displaced by the spring element into a position protruding from the capsule housing. The locking means of the holder has a sliding shoe provided with a recess, which is in sliding contact with the front part of the locking element when the linear drive is pushed in and / or out. The sliding shoe is preferably designed with a ramp-shaped sliding guide extending approximately in the insertion direction of the linear drive for sliding contact with the front part and with this recess. This results in a simple construction of these locking means as a concrete embodiment.

[0015] This recess in the slide shoe is positioned in the insertion direction relative to the bracket such that the front part snaps into the recess when the linear drive reaches a stop in the bracket. In this case, the insertion process is terminated by the stop, and at the end of the insertion process, automatic locking also occurs. In this end position, the slide shoe in the recess and the front part are each in contact with one contact surface, with these contact surfaces running at least approximately perpendicular to the insertion direction of the linear drive, so that the front part is locked in the slide shoe. In addition, advantageous additional clamping is created by the linear drive reaching the stop.

[0016] The linear drive, which comprises the drive rod and a protruding transverse flange at the front, and this C-shaped guide groove at the rear of the bracket for its mounting, is known. For example, the capsule housing of the locking device is arranged laterally near the transverse flange, and the sliding block is arranged next to this C-shaped guide groove on the rear of the bracket. This places these locking devices in an area that is almost entirely protected. In principle, the capsule housing can be arranged next to the guide groove and the sliding block next to the transverse flange.

[0017] This actuatable adjustment element is expediently attached transversely to the locking element of the locking means of the linear drive and protrudes through a longitudinal opening in the capsule housing, preferably away from the linear drive. By pushing it upwards, the locking element can be disengaged with its front part from the recess in the slide shoe, releasing the linear drive. Furthermore, the linear drive and the bracket are each assigned, in pairs, at least one electrical plug element for an electrical connection line and / or at least one plug element for at least one connection line for a preferably gaseous medium, for example, air.

[0018] The invention is further characterized by the fact that these connector elements are positioned in such a way that they are automatically inserted into the holder after insertion or during insertion, preferably at the end of the insertion process of the linear drive, and that the locking means are automatically locked. This allows for a reduction to inserting the linear drive as the only manual or robotic activity, without the need for additional manual connection of connector elements.

[0019] Even when removing the linear actuator from the bracket, only this adjustment element on one locking mechanism needs to be activated to unlock it. The plug elements assigned in pairs to the linear actuator and the bracket are released automatically.

[0020] After the linear drive has been inserted into the holder, or during insertion, preferably at the end of the insertion process, the coupling head of the linear drive's drive rod can be automatically coupled to the push rod of the slide unit by means of an axial adjustment. Furthermore, when the linear drive is removed from the holder after unlocking, the coupling head automatically moves sideways away from the push rod. This provides additional advantages in terms of automated maintenance of the sliding lock.

[0021] The invention and further advantageous embodiments thereof are explained in more detail below using exemplary embodiments with reference to the drawings. It shows:

[0022] Fig. 1 is a perspective view of a holder of an indicated sliding closure and a linear drive insertable into it, each with an exemplary locking means according to the invention;

[0023] Fig. 2 is a perspective view of the linear actuator being inserted into the holder before the locking means are locked; and

[0024] Fig. 3 a longitudinal section through the locking means in the locked state with the linear drive inserted into the holder.

[0025] Fig. 1 shows a holder 15 and a linear drive 20 of an indicated sliding closure 10, shown spaced apart from the latter and laterally insertable into the latter, having a slide housing 12 and a slide unit guided longitudinally therein, of which only a push rod 13 projecting into a side opening 16' of the holder 15 is illustrated. In addition, a plug-in stroke limiting bolt 14, which is known per se, is provided, which engages in a longitudinal groove 19 in the push rod 13 to serve as a stop for the stroke of the push rod. Such a sliding closure 10 is known per se in terms of its structure and functional operation and is therefore not shown in further detail. It is preferably suitable for a ladle containing molten steel as a container in a continuous casting plant.

[0026] 5 It could also be used on the spout of other vessels, such as a converter, a distribution vessel or even furnaces in the non-ferrous metal sector.

[0027] Particularly when using the vessel as a ladle in a continuous casting plant, the linear drive 20 is typically only inserted into this holder 15 and secured after the ladle filled with molten metal has been placed on a rotating turret on a casting platform of the continuous casting plant. This can be done manually or, preferably, by a manipulator or robot arranged on the casting platform, which automatically determines the exact position of the holder 15 of the sliding closure 10 using a detection system that can be mounted thereon. The robot then grasps the linear drive 20, preferably designed as a hydraulic piston / cylinder unit, from a storage location using a suitable gripping tool, guides it to the sliding closure 10, and inserts it transversely into the holder 15.

[0028] After insertion or during insertion, preferably at the end of the insertion process, the linear drive 20's drive rod 20' is coupled to the push rod 13 of the slide unit. 5 This is expediently done automatically by a pincer-shaped coupling head 11 being moved at the front of the drive rod 20' against the coaxially arranged push rod 13 of the slide unit and by means of pivoting spring-loaded clamping jaws 21 over The mushroom-shaped coupling flange 13' is placed over the end of the push rod 13 and engages around it in a form-fitting and / or force-fitting manner. A sliding closure with such a coupling is disclosed in EP 0 875 320 B1, and therefore no further details are explained.

[0029] The holder 15 consists of a housing 16 provided with a side opening 16', a fastening flange 17 attached to the slide housing 12 at the front, and a C-shaped guide groove 18 formed in the housing 16 at the rear for receiving a transverse flange 22 of the linear drive 20. The approximately rectangular transverse flange 22 and this C-shaped guide groove 18 with the two grooves arranged parallel one above the other are dimensioned such that the transverse flange 22 can be inserted in the insertion direction E with its guide surfaces 22' into the guide groove with almost no play up to a stop 18' at which the drive rod 20' and the push rod 13 are aligned coaxially with one another in their same adjustment direction.

[0030] According to the invention, a locking means 30 is assigned to the holder 15, and a locking means 25 is assigned to the linear drive 20, which interact in such a way that after insertion or during insertion, preferably at the end of the insertion process, of the linear drive 20 into the holder 15, the linear drive 20 is automatically locked in the holder 15. Advantageously, an adjusting element 26, which can be actuated manually or by a manipulator, is provided for unlocking the locking means 25.

[0031] As can be seen in particular from Fig. 3, the locking means 25 of the linear drive 20 very advantageously has a capsule housing 28 fastened laterally to the transverse flange 22, a locking element 27 displaceable therein and a spring member 29, wherein this locking element 27 with its front part 27' can be displaced by the spring member 29 into an initial position projecting towards the capsule housing 28, as is illustrated in Fig. 1 for the uncoupled linear drive 20.

[0032] A sliding block 31 is provided as the locking means 30 of the holder 15, which is in sliding contact with the front part 27' of the locking element 27 when the linear drive 20 is pushed in and / or out, as shown in Fig. 2, wherein the locking element 27 is adjustably mounted in the capsule housing 28 perpendicular to the insertion direction E of the linear drive 20. This almost play-free guidance of the transverse flange 22 with its guide surfaces 22' in the guide groove 18 ensures that the front part 27' is correctly guided on the sliding block 31. The sliding block 31 of this locking means 30 is fastened next to this C-shaped guide groove 18 on the exposed end face 15' of the holder 15, so that it interacts with the locking element 27 of the locking means 25 when the linear drive 20 is pushed in and / or out. This locking device 30 orIts sliding shoe 31 and the holder 15 adjacent to the guide groove 18 could be formed as a single piece. This sliding shoe 31 is designed with a ramp-shaped sliding guide 32 running approximately in the insertion direction E of the linear drive 20, with an adjoining recess 33 for a locking reception of the front part 27' of the locking element 27, in which the locking or arresting takes place. The recess 33 in the sliding shoe 31 is formed in such a position in the holder that the linear drive 20 is locked at the stop 18' at the end of the insertion process upon reaching the transverse flange 22, and this front part 27' snaps into the recess 33.

[0033] According to Fig. 3, the sliding block 31 in the recess 33 and the front part 27' that can be snapped into it are each in mutual contact with a contact surface 27", 34, which runs approximately perpendicular to the insertion direction E of the linear drive 20, so that the front part 27' in the sliding block 31 is locked by these contact surfaces 27", 34. This ensures locking at all times, even in the event of operational vibrations or impacts during the sliding closure, and reliably prevents the linear drive from becoming detached from the holder.

[0034] This manually operable adjusting member 26 is attached transversely to the locking element 27 of the locking means 25 on the linear drive 20. It protrudes through a longitudinal opening 28' from the capsule housing 28, preferably perpendicularly away from the linear drive 20, and runs parallel to the transverse flange 20, so that it is easily accessible for operation. After the casting process is complete, the linear drive 20 can be withdrawn from the holder 15 of the sliding closure 10 after this bolt-shaped adjusting member 26 has been moved upwards, thus This locking element 27 has been moved out of the recess 33. This adjusting member 26 can also be surrounded by a removable protective cap so that it is not accidentally activated when the lock is in operation.

[0035] When manually removing the linear actuator, one hand can conveniently grasp the transverse flange 22, which is equipped with a handle 24, and the other hand can grasp the handle lever 23, located parallel to the transverse flange on the rear side of the hydraulic cylinder, to pull the linear actuator out. This allows for quick unlocking and removal with a simple manual operation.

[0036] There is also the advantage that after unlocking, the coupling head 11 at the front of the drive rod 20' is also uncoupled from the push rod 13 of the slide unit by this lateral pushing out of the clamping jaws 21 from the mushroom-head-shaped coupling flange 13'.

[0037] Furthermore, a hanging element 24' is arranged on the top of the linear drive 20, by means of which the linear drive can be held when not in use. A latch lever 46 of a latching mechanism 47 is also arranged on the top of the holder 15, by means of which transport security is ensured. On the side of the hydraulic piston / cylinder unit as the linear drive 20, connection pieces 39, 44 are provided for the supply of the medium for the purpose of controlling the same, which are connected to lines not shown. In addition, a plurality of plug elements 35, 37 and corresponding plug elements 35' are assigned to the holder 15, to which connecting lines for electrical current and / or for media, for example gas or air, are connected, in particular, to the sliding closure 10 from a respective external power, gas or compressed air source.These connecting lines serve to supply power to at least one consumer unit, such as a measuring and evaluation device for early slag detection or as inductive heating, while the at least one connecting line serves for a medium as a gas seal or for cooling or the like.

[0038] Thus, an electrical male plug element 35 is arranged at the rear end 15' of the holder 15, and a corresponding female plug element 35' is arranged at the linear drive 20 on the top side of the cylinder. These two plug elements 35, 35' are positioned relative to one another in such a way that they can be plugged into one another in the insertion direction E of the linear drive. A connecting line 36' from the outside leads via an angled sleeve 36 to the plug element 35'. From the plug element 35, at least one connecting line (not shown in detail) leads via a connecting sleeve 40 along the holder 15 into the sliding closure and / or to the spout in the pan. At the opening of the plug element 35, into which the female plug element 35' can be plugged, self-opening protective flaps 38 are indicated. These flaps are folded closed when the plug element is not plugged in, preventing the penetration of dirt particles. Furthermore, according to Fig.1, two plug elements 37 are provided in the holder 15 on the inside of the stop 18' of the guide groove 18, which can be plugged in pairs with plug elements (not shown in detail) on the front side 42 of the transverse flange 22 when the transverse flange is inserted. From these plug elements 37, on the one hand, connecting lines (not shown in detail) at the linear drive 20 to external sources are led, and on the other hand, connecting lines 41, 43 are led to the sliding closure 10. These plug elements 37 are preferably designed as valve plug parts, which serve for the passage of a gaseous medium, for example, air.

[0039] The invention has a further significant advantage that, as can be seen in Fig. 2, when the linear drive 20 is inserted into the holder 15 or during insertion, preferably at the end of the insertion process, these locking means 25, 30 automatically lock and, likewise, these plug elements 35, 35', 37 are automatically inserted, thus establishing the connection of the connecting lines 36, 41, 43. Furthermore, after insertion or during insertion, preferably at the end of the insertion process, the drive rod 20' can be advanced against the coaxially arranged push rod 13 of the slide unit, and the coupling head 11 can also be automatically coupled.

[0040] However, when removing the linear drive 20, these connector elements 35, 35', 37 are released from one another after unlocking by actuating the adjusting member 26 manually or by a manipulator, and the coupling head 11 is also automatically released by moving it laterally away from the push rod 13. This automated coupling of the linear drive 20 in the holder 15 enables extremely simple handling, which is particularly suitable for robotic assembly and / or disassembly of the linear drive 20, in which incorrect manipulation due to incorrect plugging and / or failure to lock can be largely eliminated.

[0041] The invention is sufficiently illustrated by the above embodiments. However, it may be further illustrated by other variants.

[0042] In principle, the locking means could also be arranged in reverse, with the capsule housing with the locking element that can be moved therein, the adjusting member fastened to the locking element, and the spring element being arranged near the holder, while the sliding block on the linear drive would be arranged such that locking and / or unlocking could also take place in the same way. For reasons of space, the capsule housing can advantageously be fastened on the underside with the exposed end face 15' protruding from the holder, and the locking element can be moved from bottom to top into the locking position. In the sliding block on the linear drive, the recess would point downwards. The locking means could of course be designed differently than shown. For example, the front part could be designed as a wedge with corresponding self-locking contact surfaces that can be positively received in the recess of the sliding block.The adjusting element could also be placed above the capsule housing, for example, and be shaped like a bolt, flap, hook or something else.

[0043] Likewise, instead of a transverse flange on the linear actuator and a C-shaped guide groove in the bracket, other guide means could be provided, such as T-nuts or guide rollers. Furthermore, the linear actuator could be inserted and / or removed from the bracket in the direction of adjustment, for example, instead of perpendicular to the adjustment direction of its drive rod, or from bottom to top. The locking means would then have to be positioned accordingly to fulfill the function of automatic locking and, preferably, manual unlocking.

Claims

PATENT CLAIMS 1. Sliding closure for a container containing molten metal, wherein the sliding closure comprises a slide housing (12), a slide unit longitudinally guided therein with a push rod (13), a holder (15) on the slide housing (12) and a linear actuator (20) attachable in this holder (15) with a drive rod (20') coupling to the push rod (13), wherein the linear actuator (20) is preferably slid into the holder (15) on the slide housing (12) transversely to its adjustment direction and can be removed from it and locked in the holder (15), characterized in that at least one locking center is provided on the linear actuator (20) and on the holder (15). (25, 30) are present, preferably attached, and are designed to interact in such a way that the linear drive (20) automatically locks into the holder (15) after or during insertion, preferably at the end of the insertion process.

2. Sliding lock according to claim 1, characterized in that the linear drive (20) locked in the holder (15) can be unlocked, wherein for this unlocking an adjusting element (26) that can be actuated manually or by a manipulator is provided at the at least one locking means (25, 30).

3. Sliding lock according to claim 1 or 2, characterized in that one locking means (25) is a sliding locking element (27) has a front part (27') in which this front part (27') engages in a recess (33) of the other locking means (30) when locking, wherein the locking element is preferably adjustable in a transverse direction to the insertion direction (E) of the linear drive (20).

4. Sliding lock according to claim 3, characterized in that the locking means (25) of the linear drive (20) comprises a capsule housing (28), a locking element (27) slidably therein, and a spring element (29), wherein the locking element (27) with its front part (27') is guided by the spring element (29) into a position relative to the capsule housing (28) the aforementioned position is displaceable, while the locking means (30) of the holder (15) has a sliding shoe (31) provided with the recess (33), which is in sliding contact with the front part (27') of the locking element (27) when the linear drive (20) is inserted and / or removed.

5. Sliding lock according to claim 4, characterized in that the sliding shoe (31) has a ramp-shaped sliding guide (32) extending at least approximately in the insertion direction of the linear drive for sliding contact with the front part (27') and subsequently this recess (33) for receiving the front part (27') of the locking element (27).

6. Sliding closure according to claim 4 or 5, characterized in that this recess (33) in the sliding shoe (31) is positioned in the insertion direction (E) such that the front part (27') snaps into the recess (33) when the linear drive (20) comes to rest against a stop (18') in the holder (15) at the end of the insertion process.

7. Sliding lock according to one of claims 4 to 6, characterized in that the sliding shoe (31) in the recess (33) and the front part (27') are in contact with each other with a contact surface (27", 34) in the locked state, wherein these contact surfaces (27", 34) run at least approximately perpendicular to the insertion direction (E) of the linear drive, so that the front part is locked in the sliding shoe.

8. Sliding lock according to one of claims 4 to 7, characterized in that the linear drive (20) has the drive rod (20') and a projecting transverse flange (22) on its front side and the holder (15) has an egg-shaped guide groove (18) on its rear side for receiving the transverse flange (22) and thus the linear drive (20), wherein the capsule housing (28) of the locking means (25) is located laterally at the transverse flange (22), while the sliding shoe (31) is located next to this C-shaped guide groove (18) on the rear side (15') of the holder (15) or conversely, that the capsule housing is located next to the guide groove and the sliding shoe is located laterally at the transverse flange.

9. Sliding lock according to one of claims 1 to 8, characterized in that the actuable adjusting element (26) is attached transversely to the locking element (27) of the locking means (25) at the linear drive (20) and protrudes through a longitudinal opening (28') from the capsule housing (28) preferably away from the linear drive.

10. Sliding closure according to claim 9, characterized in that, for removing the transverse flange (22) of the linear drive (20) from the guide groove (18) of the holder (15), this adjusting element (26) on the capsule housing (28) can be actuated upwards manually or by a manipulator, and thus this locking element (27) with the front part (27') can be unlatched from the recess (33) in the sliding shoe (31) and the linear drive (20) can be pulled out.

11. Sliding lock according to one of claims 1 to 10, characterized in that at least one electrical connector element (35, 35') for an electrical connection cable and / or at least one connector element (37) for at least one connection cable (36, 41, 43) for a gaseous medium, preferably air, are assigned to the linear drive (20) and the holder (15) in pairs, which are positioned such that they are automatically inserted into the holder (15) after or during insertion, preferably at the end of the insertion process, of the linear drive (20) and that the locking means (25, 30) are automatically locked.

12. Sliding lock according to claim 11, characterized in that the coupling head (11) of the drive rod (20') of the linear drive (20) can be coupled automatically to the push rod (13) of the sliding unit by means of an axial adjustment after or during the insertion, preferably at the end of the insertion process, of the linear drive (20) in the holder (15).

13. Sliding lock according to claim 11 or 12, characterized in that when the linear drive (20) is removed from the holder (15) the locking means (25, 30) can be unlocked from each other by this actuable adjusting element (26) at one locking means (25, 30) and the plug elements (35, 35', 37) assigned in pairs to the linear drive (20) and the holder (15) can be released automatically.

14. Sliding lock according to claim 13, characterized in that the coupling head (11) of the drive rod (20') can be automatically detached from the push rod (13) by moving it laterally when the linear drive (20) is removed from the holder (15) after the locking means (25, 30) have been unlocked.

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