CORE PULLER DEVICE FOR A BLOCK MACHINE, BLOCK MACHINE AND METHOD FOR THE PREPARATION OF SHAPED STONES

Abstract

A core puller device for a block machine, a block machine with such a device as well as a method for the preparation of shaped stones in which at least one core puller arranged on the sliding facility of the core puller device is temporarily inserted into a stone mould of the block machine and retracted after a packing operation in the block machine are provided. Here, the core puller device is constructed or the method is configured such that the operative connection between the at least one core puller and the sliding facility of the core puller device is temporarily neutralized.

Claims

1. A core puller device for a block machine having at least one core puller for generating a recess in at least one shaped stone to be prepared with the block machine that can be inserted into and retracted from a stone mould of the block machine by means of a sliding facility, wherein the operative connection between the sliding facility and the at least one core puller can be neutralized at least temporarily.

2. The core puller device according to claim 1, wherein the core puller device has several core pullers extending in parallel.

3. The core puller device according to claim 1, wherein the sliding facility has a core puller accommodation that is configured such that it at least partially surrounds at least one end of a core puller, preferably the ends of all core pullers it encloses, each with a clearance.

4. The core puller device according to claim 3, wherein the clearance between core puller accommodation and each core puller it surrounds is formed such large that the core puller while being inserted into the stone mould of the block machine can freely vibrate with the stone mould at its end surrounded by the core puller accommodation during a packing operation.

5. The core puller device according to claim 3, wherein at least one core puller at its end surrounded by the core puller accommodation has an abutment that is preferably formed as a collar.

6. The core puller device according to claim 5, wherein the collar is part of a sleeve-like core puller mount attached to the end of the core puller.

7. The core puller device according to claim 3, wherein the abutment for making the operative connection is formed such that the abutment abuts on the core puller accommodation when the sliding facility retracts the at least one core puller from the stone mould.

8. The core puller device according to claim 3, wherein the core puller accommodation has a coulisse-like configured draw plate on which the abutment of a core puller arranged in the core puller accommodation at least partially can abut.

9. The core puller device according to claim 8, wherein the draw plate is formed as a crest-like coulisse with several crests on the crests of which the abutments of several, preferably all core pullers arranged in the core puller accommodation at least partially abut.

10. The core puller device according to claim 1, wherein the core puller accommodation has a pressure plate on which the front side of the end of a core puller arranged in the core puller accommodation then at least partially can abut when the core puller is inserted into the stone mould by the sliding facility.

11. The core puller device according to claim 10, wherein at least one bearing is attached to the pressure plate of the core puller accommodation to reduce the friction between the core puller accommodation and the at least one core puller.

12. The core puller device according to claim 1, wherein the core puller device has at least one core puller bearing that is movable, preferably in vertical direction.

13. The core puller device according to claim 12, wherein the movable core puller bearing is formed as a lever arranged at the sliding facility with which preferably all of the core pullers arranged in the core puller accommodation can be lifted simultaneously.

14. The core puller device according to claim 1, wherein the core puller device has a movable core puller guide that is preferably swivel-mounted to the rack of the core puller device.

15. The core puller device according to claim 14, wherein the core puller guide is formed as an upwardly open coulisse in which at least one core puller, preferably all of the core pullers, is/are laterally guided and supported in height.

16. The core puller device according to claim 1, wherein the sliding facility, the core puller bearing, and/or the core puller guide each can be moved motorically by an own drive.

17. The core puller device according to claim 1, wherein the core puller device has a height adjustment that is preferably formed as a movable lifting rack with which the height of the core puller device, especially that of the core pullers, can be adjusted relative to the block machine, especially to its stone mould.

18. The core puller device according to claim 1, wherein the sliding facility is formed as a slide car that is preferably movable by means of guide rails attached to the rack of the core puller device in a guided manner.

19. A block machine having a core puller device according to claim 1.

20. A method for the preparation of shaped stones with a block machine having a core puller device in which at least one core puller arranged on a sliding facility of the core puller device is temporarily inserted into a stone mould of the block machine and retracted after a packing operation in the block machine, wherein the operative connection between the at least one core puller and the sliding facility of the core puller device is neutralized temporarily.

21. The method for the preparation of shaped stones according to claim 20, wherein the operative connection during the packing operation is neutralized such that the end of the at least one core puller that faces the core puller device can freely vibrate in the core puller device.

22. The method for the preparation of shaped stones according to claim 20, wherein the operative connection is neutralized and established by traversing and/or swiveling a part of the core puller device, especially a core puller bearing and/or a core puller guide.

23. The method for the preparation of shaped stones according to claim 20, wherein at least one core puller is at least temporarily vertically supported and/or horizontally guided during the insertion into and/or retraction from the stone mould by at least one core puller guide.

24. The method for the preparation of shaped stones according to claim 20, wherein at least one core puller is temporarily vertically supported during the insertion into and/or retraction from the stone mould by at least one core puller bearing, wherein the core puller bearing is preferably moved together with the sliding facility when inserting and/or retracting the core puller.

25. The method for the preparation of shaped stones according to claim 20, wherein the vertical position of the core puller device relative to the stone mould is adjusted by means of a height adjustment before the at least one core puller is inserted into the stone mould.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In the following the invention is explained in detail by way of various examples. Here:

[0045] FIG. 1: schematically shows a view of a block machine with a core puller device according to a first embodiment according to the invention;

[0046] FIG. 2: schematically shows a plan view of a part of the block machine with a core puller device shown in FIG. 1 along the section E-F outlined in FIG. 1;

[0047] FIG. 3: schematically shows a perspective view of the core puller device shown in FIG. 1 together with a stone mould;

[0048] FIG. 4: schematically shows a cross section of the core puller device and stone mould shown in FIG. 3 along the section A-B outlined in FIG. 3 shortly before the core pullers are inserted into the stone mould;

[0049] FIG. 5: schematically shows a cross section corresponding to FIG. 4 in a state where the core pullers are inserted into the stone mould;

[0050] FIG. 6: schematically shows a cross section of the core puller device shown in FIG. 3 along the section C-D outlined in FIG. 3;

[0051] FIG. 7: schematically shows the enlarged detail C of the core puller device shown in FIG. 6;

[0052] FIG. 8: schematically shows the core puller accommodation of the enlarged detail A of the core puller device shown in FIG. 4;

[0053] FIG. 9: schematically shows a side view of the core puller accommodation shown in FIG. 8;

[0054] FIG. 10: schematically shows the core puller accommodation of detail B of the core puller device shown in FIG. 5; and

[0055] FIG. 11: schematically shows a side view of the core puller accommodation shown in FIG. 10.

DETAILED DESCRIPTION

[0056] FIG. 1 shows a block machine 1 with a stone mould 2 and a core puller device 3 for the preparation of shaped stones according to a first embodiment.

[0057] As particularly illustrated in FIG. 3 and FIG. 4, the core puller device 2 in the present embodiment has a rack 4 that is firmly connected to the ground and the block machine 1. A sliding facility 5, here formed as a slide car, is attached to the rack 4. As can well be seen especially in FIG. 2 and FIG. 3, this is movably guided along two guide rails 6. Here, the slide car 5 is driven by a drive 7 that can be formed as a hydraulic cylinder, as shown here.

[0058] The slide car 5 further has a core puller accommodation 8 to which parallel core pullers 9 via core puller mounts 10 arranged thereto are arranged such that the operative connection between the slide car 5 and the core pullers 9 can at least temporarily be neutralized. Here, the core pullers 9 are vertically supported by a movable core puller bearing 11 and by a movable core puller guide 12. The latter, in addition to the vertical support also causes a horizontal guidance of the core pullers 9. In this way, the core pullers 9 can be horizontally held in position to be inserted into lateral openings 13 of the stone mould 3. In the example shown here, the stone mould 3 has fife parallel rows with ten moulding cavities 14 each that constitute the form for the shaped stones made. Fifteen core pullers 9 in total are arranged on the slide car 5 in groups of three, wherein one group each can be inserted into one row of the moulding cavities 14. However, it should be noted that any other designs of the stone mould of course are also conceivable in the meaning of the invention.

[0059] As shown in FIG. 4, the core puller device 2 has a height adjustment 15, here formed as a lifting rack, that is arranged between the rack 4 and the remaining core puller device 2. Thus, all the other components of the core puller device 2 can be positioned in their height relative to the rack 4. In this way, the optimum position of the core puller device 2 and the core pullers 9 relative to the stone mould 3 can be adjusted with its bolster plate 19 and the core pullers 9 can be inserted into the openings 13 of the stone mould 3.

[0060] The core puller guide 12 is fixed to the rack 4. Here, the core puller guide 12 is movably supported about the rotational point 17 via a swivel lever 16. Here, the position of the core puller guide 12 can be adjusted by a drive 18, here for example formed as a pneumatic cylinder. In this way, as shown in FIG. 5, the core puller guide 12 can be swiveled away downwards as soon as the pneumatic cylinder 17 extends its piston. When the slide car 5 with the core pullers 9 attached thereto travels toward the stone mould 3 the core puller guide 12 holds its position and thus, represents a firm guide and vertical support for the core pullers 9. Here, the core puller guide 12 is formed as an upwardly open coulisse that has several depressions, as shown in FIG. 3. The core pullers 9 are supported within these depressions and guided toward the stone.

[0061] As illustrated in FIG. 10, the sleeve-like core puller mount 10 is attached to the core puller 9 that has an abutment at the end, in the present case exemplarily formed as a collar.

[0062] The core puller accommodation 8 as far as it is concerned is configured such that a spatial clearance can be established between the core puller accommodation 8 and the core puller mount 10 together with its abutment when the core puller accommodation 8 has been brought into a position suitable for that. At the same time, however the core puller accommodation 8 is also formed such that the abutment of the core puller mount 10 abuts thereto when the operative connection between the core puller and the core puller device is to be re-established. Here, the clearance is dimensioned such that the core puller 9 in the state inserted into the stone mould 3 can freely vibrate therewith during the packing operation.

[0063] For inserting and retracting the core puller 9 the core puller accommodation 8 has a draw plate 20 and a pressure plate 21 that are arranged spaced apart such that the clearance is established between these two components. The collar of the core puller mount 10 is located between the draw plate 20 and the pressure plate 21 and thus, comes into contact with these as follows:

[0064] When inserting the core puller 9 the pressure plate 21 abuts on the collar and pushes the core puller 9 into the stone mould 3. The pressure plate 21 further has a bearing 22 that is formed as a contact surface to the collar and dampens the impact of the core puller accommodation 8.

[0065] When retracting the core puller 9 from the stone mould 3 the operative connection is established such that the collar of the core puller mount 10 abuts on the draw plate 20. As shown in FIG. 6, for this purpose the draw plate 20 is configured coulisse-like with several crests to contact the core pullers 9 mainly laterally and below them. FIG. 7 again in detail shows the configuration of the draw plate 20. The draw plate 20 is configured such that it can only come into contact with the collar of the core puller mount 10. The core pullers 9 extend between the crests without radially contacting them.

[0066] During the insertion and retraction of the core pullers 9 these are vertically supported by the movable core puller bearing 11. The core puller bearing 11, as shown in FIG. 11, is formed as a lever. By a drive 23, here exemplarily formed as a pneumatic cylinder, the core puller bearing 11 can vertically be moved and thus, simultaneously lift all core pullers 9 that are arranged in the core puller accommodation 8. Moreover, the core puller bearing 11 is arranged at the slide car 5 and thus, when inserting and retracting the core pullers 9 can also travel toward the stone mould 3 and in the opposite direction. Thus, the core pullers 9 can always be vertically supported at the same place near the core puller accommodation 8. Thus, the core puller accommodation 8 need not take over a vertical support.

[0067] In the following there is described a method according to the invention for the preparation of shaped stones according to a first embodiment.

[0068] First, the optimum height of the core puller device 2 can be adjusted via the lifting rack 15 shown in FIG. 4 relative to the stone mould 3 of the block machine 1. The core pullers 9 are attached in parallel to the slide car 5 via the core puller accommodation 8 and are positioned outside the stone mould 3. In this state, the core pullers 9 are vertically supported by the core puller bearing 11. Additionally, the core pullers 9 are held in an aligned position opposite to the openings 13 of the stone mould 3 by the core puller guide 12. Slipping out of the core pullers 9 is prevented by the collar at the core puller mount 10.

[0069] As shown in FIG. 4, in the initial position the hydraulic cylinder 7 is in the retracted state. The swivel lever 16 is in an upright position, whereby the core puller guide 12 vertically supports and guides the core pullers 9 in a horizontal position to the openings 13 of the stone mould 3. As shown in FIG. 9, in this state also the core puller bearing 11 is brought into position by the pneumatic cylinder 23 as far as the core pullers 9 near the core puller accommodation 8 rest thereon.

[0070] By extending the hydraulic cylinder 7 now the slide car 5 is moved along the guide rails 6 toward the stone mould 3. In this way, the core pullers 9 guided by the core puller guide 12 are inserted into the stone mould 3. As shown in FIG. 8, the pressure plate 21 abuts on the respective core puller mount 10 via the bearing 22 and thus, establishes an operative connection. Here, the bearing 22 is exemplarily formed as a roller plate with one ball transfer unit per core puller 9 each. Now, the core pullers 9 are pushed into the stone mould 3. Here, the vertical support in the region of the core puller accommodation 8 is only taken over by the core puller bearing 11.

[0071] As soon as the core pullers 9 are in the openings 13 of the stone mould 3 and guided therethrough the swivel lever 16 swivels downwards about the rotational point 17. Here, the swivel lever 16 is driven by the pneumatic cylinder 18. In this way, the vertical support and horizontal guidance of the core pullers 9 by the core puller guide 12 are neutralized and taken over by the stone mould 3.

[0072] Before the core puller accommodation 8, when further inserted, reaches the stone mould 3 the core puller bearing 11 is lowered by the pneumatic cylinder 23, as shown in FIG. 11. Now, the core pullers 9 are only vertically supported and horizontally guided by the stone mould 3 and built-in retaining rings 24. The core pullers 9 are pushed into the final position by means of the pressure plate 21.

[0073] As shown in FIG. 10, thereupon the hydraulic cylinder 7 is retracted to some extent so that the slide car 5 together with the core puller accommodation 8 moves away from the stone mould 3. In this way, the operative connection between the core puller accommodation 8 and the core pullers 9 with their core puller mounts 10 is completely neutralized. Certainly, the core puller mounts 10 are within the core puller accommodation 8, but all around have a sufficient clearance, so that the core pullers 9 are only in contact with the stone mould 3.

[0074] Now, the core pullers 9 are almost symmetrically and freely uncoupled from the core puller device 2 in the stone mould 3. In the subsequent filling operation with concrete 25 and packing in this way no additional force component acts on the stone mould 3 except the vertical force component required for packing. The center of gravity of the core pullers 9 is located inside the stone mould 3. Thus, by neutralizing the operative connection an even more uniform packing of the concrete of the shaped stones is possible and at the same time the wear within the entire device is reduced.

[0075] After completion of the packing operation the core pullers 9 are retracted from the stone mould 3. For that, the drive 7 is pulled back, whereby the slide car 5 with the core puller accommodation 8 is moved away from the stone mould 3. In this way, the draw plate 20 abuts on the collar of the core puller mount 10. That is, there is established an operative connection between the core puller mounts 10 and the core puller accommodation 8 for retracting the core pullers 9. By further pulling back the drives 7 now the core pullers 9 are retracted from the stone mould 3 again. During the retraction the core puller bearing 11 travels upward again to vertically support the core pullers 9. Also, thereupon the swivel lever 16 again swivels into the upright position and thus, brings the core puller guide 12 back to the initial position to vertically and horizontally guide the core pullers 9. This operation has to be completed before the ends of the core pullers 9 leave the stone mould 3. In this way, it is ensured that the core pullers 9 can always be held in position. After the core pullers 9 have been retracted from the stone mould 3 the shaped stones can be carried away by the bolster plate 19.

LIST OF REFERENCE NUMBERS

[0076] 1 block machine [0077] 2 core puller device [0078] 3 stone mould [0079] 4 rack [0080] 5 sliding facility (slide car) [0081] 6 guide rail [0082] 7 drive (hydraulic cylinder) [0083] 8 core puller accommodation [0084] 9 core puller [0085] 10 core puller mount [0086] 11 core puller bearing [0087] 12 core puller guide [0088] 13 opening [0089] 14 moulding cavity [0090] 15 height adjustment (lifting rack) [0091] 16 swivel lever [0092] 17 rotational point [0093] 18 drive (pneumatic cylinder) [0094] 19 bolster plate [0095] 20 draw plate [0096] 21 pressure plate [0097] 22 bearing (roller plate with ball transfer units) [0098] 23 drive (pneumatic cylinder) [0099] 24 retaining ring [0100] 25 concrete [0101] A detail A [0102] B detail B [0103] C detail C