EP0562437A1 - Moulding device for making concret products - Google Patents

Abstract

In a moulding device for producing concrete pipes, having a mould core and a mould jacket, passage-forming cores (38a, 40a) are disposed between the mould core (16) and the mould jacket (22) for forming passages through the pipe jacket of the moulding. One (38a) of these passage-forming cores is mounted detachably on the inside of the mould jacket (22) whilst the other (40a) is mounted detachably on the outside of the mould core (16). In order to adjust the angular distance between the two passages (38 and 40), the mould core (16) is angularly adjustable with respect to the mould jacket (22), so that, corresponding to the angular adjustment made, an angular adjustment between the passages (38, 40) also results. The angular adjustment of the mould core (16) with respect to the mould jacket (22) can also take place here by means of a remote-controlled drive device. <IMAGE>

Description

The invention relates to a molding device for the production of concrete pipes with an axis, in particular concrete pipes with an end wall, that are concrete pipes that are also referred to in technical terms as "manhole bases". The concrete pipes should have passages in the area of the pipe jacket at an angular distance from one another and possibly also at an axial distance from one another. These passages are required in particular for connecting inflow and outflow pipes and should therefore generally be designed with corresponding folds for connecting such inflow and outflow pipes.

Molding devices for the production of such concrete pipes are known per se from German patent specification 2l 34 627 and German patent specification 25 4l 6l2. These mold devices comprise a mold cavity delimitation with a mold core and a mold jacket, which delimit a mold cavity which is ring-shaped and which can be closed at the bottom at a part of a height. If it is said here that the mold cavity is annular at least over part of its height, this is intended to keep the possibility open that the mold cavity is disc-shaped above a remaining height of the molded part, in order to form an end wall if necessary, namely when a Pipe with end wall to be produced, ie a manhole base. Furthermore, such a molding device comprises passage-forming cores which essentially radially traverse the annular mold cavity and which can be releasably attached to parts of the mold cavity delimitation which can be rotated relative to one another about the axis. These passage formation cores are inserted into the mold cavity before the mold cavity is filled, so that when the concrete is filled into the mold cavity, the cores are flowed around and the desired ones are located in the area of these passage formation cores in the wall of the tubular jacket Passages result. During the subsequent removal of the mold, ie the concrete pipe, the passage formation cores are released from the associated mold cavity delimitation parts, so that the mold can be separated from the mold cavity delimitation parts. The passage-forming cores initially remain in engagement with the passages of the molded article formed by them and can then be removed from these passages later in order to be reinserted into the annular section of the mold cavity in preparation for a later working cycle. The dwell time of the passage formation cores in the molding formed in each case depends on the consistency of the concrete at the time of the formwork removal and on the shape of the particular molding, in particular also on the size of the passages.

The resulting moldings, i.e. H. Concrete pipes are required for the most diverse installation situations, for example in a sewer network, and must be adapted to these different situations, i.e. H. the passages must be placed relative to one another and relative to any profiling of the molded article deviating from the circular symmetry at different heights and at different angles relative to one another. Depending on the type of connecting pipes that follow, different passage formation cores can be used which correspond to the different connection forms of different connecting pipes.

Accordingly, it is known to make the mold cavity limitation parts designed for releasable fastening of the passage formation cores relative to one another relative to one another about the axis of the pipe to be obtained and thus also about the axis of the molding device relative to one another, so that the passage formation cores are also adjusted by angular adjustment of the mold cavity limitation parts can be set relative to each other to desired angular distances. In addition, it is also possible to arrange the passage formation cores at different axis heights in relation to a pipe end serving as a reference plane. The passage formation cores can be fastened to the mold cavity delimitation parts, which can be adjusted relative to one another in a variety of ways. However, care must always be taken to ensure that the fastening is carried out in such a way that, depending on the individual design of the formwork, the passage formation cores can be detached from the mold core and the mold jacket before the mold is removed or can become detached during the formwork removal.

The mold cavity delimitation parts, which can be rotated relative to one another, cannot easily be rotated relative to one another by hand if the molds are large and in particular if they have been in use for a long time and the form delimitation parts are contaminated by concrete residues. In order to be able to adjust the mold cavity delimitation parts relative to one another without great effort for the operator, hydraulic auxiliary devices have already been used as motor drive means in order to be able to twist the mold space delimitation parts.

The molding devices under consideration here also generally include fillers for filling the mold cavity with flowable concrete, compacting agents for compacting the filled concrete and means for exposing the molding formed in each case and for completing the mold cavity limitation for a further molding cycle after a molding has been exposed.

If in the previously known molding devices a change to different angular distances between the If passages are to be carried out, the operator must go into the area of the shaping device and carry out the twisting there either by hand, possibly in conjunction with turning tools, or by means of a motor auxiliary device. This is cumbersome and time consuming and also implies that the operator enters the danger area defined by the immediate surroundings of the molding device.

In order to facilitate the handling of the molding device by an operator and to shorten the cycle times for the production of individual moldings, it is proposed according to the invention that the motor drive means are designed with a remote control which enables the setting of a desired setting angle between the mold cavity limitation parts which can be rotated relative to one another without direct visual monitoring allowed.

The use of such a remote control allows the operator to make the relative angular adjustment of the mold cavity delimitation parts more or less distant from the location of the molding device, in particular from a location where the operator also has to perform other activities in the course of the operating procedure. It is no longer necessary for the shaping device to be in the operator's field of vision. In particular, it is no longer necessary for the operator to be able to directly observe the angle setting of the mold cavity delimitation parts and / or the passage formation cores from the respective location of the remote control. According to a first embodiment, it is provided that the remote control comprises a starter for the motor drive means, an actual angle sensor and, at the location of the starter, an actual angle detector which can be monitored by the operator. The actual angle sensor is either directly to the Movement of one of the relatively angularly adjustable mold space limitation parts or coupled to the drive means used for the angle adjustment and transmits a mechanical or electrical signal to the actual angle detector, on the basis of which the actual angle detector provides the operator with immediate information, particularly perceptible to the eye the actual angle present at any moment between the mold cavity delimitation parts which are adjustable relative to each other. If the operator determines that the relative angular position does not correspond to the desired relative angular position in the following working cycle, the starter can manually actuate a relative movement by means of the drive means and continue to do so until he reaches the actual angle detector on the desired target angle can determine.

In order to ensure that, starting from an initially existing actual angle, the desired target angle is achieved in the shortest angular path and, in particular, to be able to carry out an adjustment even if the parts which can be adjusted relative to one another cannot be freely rotated against one another over 400 ^g , It is proposed that the motor drive means are designed to be reversible in the direction of rotation and that the starter is assigned a direction of rotation selector for the drive means. At the start of an angle change operation, the operator can then first determine the current angle position using the actual angle detector and then decide in which direction he has to let the drive means run in order to arrive at the desired target position by the shortest angular path.

In this embodiment of the invention, an automatic standstill of the angle adjustment movement after reaching the desired target angle is not absolutely necessary. However, to ensure that the adjustable relative to each other Molding space limitation parts are not set in a continuous relative rotation and do not start against any stops, it is recommended that the starter is biased towards a standstill position, ie towards a position in which the drive means stand still. This starter then keeps the drive means in relative actuating mode only as long as the operator acts on the starter against the pretension by hand or foot.

According to another embodiment of the invention it is provided that a target angle selector is provided at the location of a starter for the drive means. An actual angle sensor is again provided at the location of the molding device. The actual angle sensor and the target angle are connected to a comparator; The comparator is followed by means for stopping the drive means, which inevitably bring the drive means to a standstill when the target angle and the actual angle are approximately the same. In this case one speaks of a controlled remote control, often also of a "closed loop" remote control. In this embodiment, the operator only needs to set the desired target angle on the target angle selector and actuate the starter. The setting of the target angle then runs automatically and comes to a standstill as soon as the target angle is reached. This embodiment further simplifies the operator's work. However, it should not be excluded that, in addition to this type of remote control device, there is also an actual angle detector, which gives the operator additional control over the reaching of the target angle or, for example, over that until the target angle is reached conveyed the necessary time. The transmission path between the actual angle sensor and the actual angle detector can be an electrical, a hydraulic or a mechanical transmission path, for example the transmission can take place by means of a Bowden cable if one is on wants to do without the more complicated and expensive electrical or hydraulic transmission lines because of the rough operation in a concrete mold factory.

In this last-described embodiment of the "closed loop" actuation, it is also possible that the comparator is designed to determine the sign of a desired angle-actual-angle difference and that the comparator has means for reversing the direction of the drive means as a function of the determined one Signs are added. This ensures that, depending on the actual angular position in the starting position, the correct direction of rotation of the drive means is inevitably switched on due to the comparator signal, which leads to the desired angle in the next way.

According to a further embodiment it is provided that the starter is assigned a target angle transmitter and that the drive means are linked to the target angle transmitter in such a way that they provide an actual angle setting corresponding to the target without feedback of the actual angle -Activate angle specification. This is possible, for example, when using a stepping motor as the drive means. The stepping motor is supplied by the setpoint angle transmitter with a predetermined number of switching pulses, which force a corresponding number of switching steps of the same angular size on the stepping motor. Of course, the target angle transmitter in the control unit can be calibrated again in angular dimensions, so that a desired actual value setting is inevitably brought about by actuation of push buttons assigned to the respective angular dimension or the like. One speaks here of an "open loop control" because feedback of the actual angle to the location of the operator is not absolutely necessary. However, it should be noted that a visual inspection at the operator's location is also conceivable here, in turn by the respective molded part or the drive means of which an angle sensor is attached, which provides the respective actual angle display on a display in the area of the operator's location. Of course, this type of open loop control is not linked to the presence of a stepper motor. Such an open loop control can be carried out just as well hydraulically, for example with a system consisting of a master cylinder unit and a slave cylinder unit.

In order to keep the mold space limitation parts carrying these passage formation cores in a rigid relative position for the subsequent concrete filling process and in particular for the subsequent vibrating process in a molding device according to the invention once the desired angle between the passage formation cores has been set, without stressing the drive means, it can be provided that this is relative a blocking device which is rotatable relative to one another in the mold cavity delimitation part and that this blocking device can in turn be operated remotely, in particular from the same location as the motor drive means. The blocking device can be of any type, either with a friction brake or with an indexing pin or the like.

In order to further facilitate the handling of the shaping device for the operator, namely by minimizing the number of operations required on a control unit, it is further proposed that the remote control of the blocking device be linked to the remote control of the motor drive means in such a way that the motor drive means at or become driving with a time delay after the blocking device has been released and / or that the blocking device has a blocking effect with or with a time delay after the motor drive means have come to a standstill.

It has already been mentioned above that the molding device according to the invention with fillers for filling the mold cavity, Compaction means for compacting the filled concrete, furthermore can be equipped with means for exposing the respectively formed molding and with means for completing the mold cavity limitation for a further molding cycle after exposure of a molding. With a view to optimal ergonomics, all these means can also be remotely operable, and it is advisable to make these additional remote actuation means, if present, releasable from a remote actuation location from which the remote actuation for the motor-driven means of angular adjustment and, if applicable, the remote actuation means of Blocking device are triggered. In the ideal case, the operator then has one or more control panels, from which he or all of these multiple control panels can initiate all remote control measures necessary in the course of the pipe production. The operator then only needs to make a possible exchange of the passage formation cores, which occurs relatively rarely, especially if the aim is to manufacture series of pipes for different connecting pipe shapes one after the other by setting the appropriate angular spacing from case to case between the connections. At this point it should also be mentioned that a pipe manufacturer receives from its customers the angular distances of various sizes for individual pipes and small lots, so that a change in the angular distance is often necessary after each molding cycle. This highlights the great technical and economic importance of the proposed invention. It should also be mentioned that it is also possible in principle to effect the height adjustment of the passage formation cores with appropriate remote control means. As a rule, however, this is not necessary because the altitudes are standardized to a much greater extent than the angular positions.

The configuration of the molding device according to the invention can be used in particular when the rotatable ones Parts of the mold cavity boundary are formed on the other hand by the mandrel and the mandrel, that is, when one or more continuation cores are removably attached to the mandrel and one or more continuation cores are attached to the mandrel, and when the mandrel and mandrel are rotated relative to each other, as in FIG German Patent 21 34 627 is described. In addition, the solution according to the invention can also be considered if, for example, the two mold cavity delimitation parts which can be rotated relative to one another are formed by adjoining segments of the molded casing and these are to be adjusted relative to one another, as is described in German Patent 25 41 612.

For reasons of simpler mechanical construction, it is preferred to make the mandrel rotatable by the motor drive means and to fix the mandrel in a non-rotatable manner during operation.

The configuration of the molding device according to the invention is also independent of the type of operating sequence on which the molding device is based. It is thus possible to use the configuration according to the invention when the mold cavity can be delimited at the bottom by a lower sleeve, which can be placed on a support which is stationary with respect to the mold core, when the mold jacket can also be adjusted in height with respect to the mold core and the lower sleeve for the purpose of the first demoulding step , if a lifting drive is provided for lifting the molded casing (demoulding) and for lowering the molded casing (mold completion) again, and if a further lifting drive is provided for lifting the lower sleeve and the molded article relative to the molded core. This is a common design of molding equipment.

In addition, the configuration according to the invention can also be used when the mold core and the mold jacket are operational are arranged at a fixed height if a lower sleeve which is vertically movable between the mold core and the mold jacket is provided, which can be supported in a filling position at the lower end of the mold cavity and if an ejector is also provided when the molded article is exposed from the mold cavity, which pushes the lower sleeve upwards attacking from below permitted and, when pushing out the lower sleeve, also pushes the molding resting on the lower sleeve out of the mold cavity. This configuration is of particular importance when a pipe with an end wall, ie a manhole base is to be produced and when a lost formwork element is placed on the upper end of the mandrel. It has been shown that the ejection of the lower sleeve and molded article while leaving the mandrel and the molded jacket in the mold filling position during the ejection reduces or suppresses the risk of hairline cracks at the point of transition from the end wall to the tubular jacket. For this reason, a particularly important feature of the invention is seen in the design of the molding device with such an ejector, which, regardless of the formation of passages in the pipe jacket, should in any case enjoy independent protection when used for the production of pipes with an end wall (manhole bases) lost formwork is installed to support the end wall during hardening.

The basic concept of the invention of the remote actuation of the angle adjustment drive is of particular importance when the mold cavity boundary is arranged below a main work surface over which the fillers and the means for removing the moldings are arranged. In this case, it is particularly difficult to have the operator make an angle adjustment of the mold space delimitation parts which are adjustable relative to one another at the location of the molding device. The sinking of the mold cavity below this Work surface (one speaks of underfloor operation) is advantageous for many reasons, especially for the reason of noise insulation.

Fig. l

einen die Achse enthaltenden Schnitt durch eine unterflurangeordnete Formeinrichtung nach der Erfindung;

Fig. 1a

eine Schnittansicht des Formlings gemäß Figur 2;

Fig. 2

eine Draufsicht zu der Anordnung gemäß Fig. l;

Fig. 3

eine abgewandelte Ausführungsform einer Formeinrichtung wiederum im achsenthaltenden Schnitt betrachtet;

Fig. 4

ein Schema einer ersten Ausführungsform einer Fernbetätigung;

Fig. 5

ein Schema einer zweiten Ausführungsform einer Fernbetätigung;

Fig. 6

ein Schema einer dritten Ausführungsform einer Fernbetätigung.

The accompanying figures explain the invention using exemplary embodiments. It represent

Fig. L

a section containing the axis through an underfloor molding device according to the invention;

Fig. 1a

a sectional view of the molding according to Figure 2;

Fig. 2

a plan view of the arrangement of FIG. 1;

Fig. 3

a modified embodiment of a molding device again viewed in the axis-containing section;

Fig. 4

a diagram of a first embodiment of a remote control;

Fig. 5

a schematic of a second embodiment of a remote control;

Fig. 6

a diagram of a third embodiment of a remote control.

In Fig. 1, the main working level is designated l0. In the main working level, a pit l2 is sunk under the ground, which receives the molding device. On the bottom of the pit stands a bracket l4, which carries the mandrel l6. A support l8 for a lower sleeve 20 is arranged on the mold core l6. A shaped jacket 22 rests on the lower sleeve 20. A collar of the shaped jacket is designated by 24 and is approximately flush with the main working level l0. The shaped jacket can be raised by a lifting device 26 from the illustrated filling and shaping position into a position in which its lower end is at a distance from the main working level 10 which is greater than the height of the molding being formed plus the lower sleeve. The lower sleeve 20 can be lifted together with the molding that is formed on it by means of a further lifting drive 28. The lifting drive 28 acts on a lifting plate 30, which grips the lower sleeve 20, but can pass the support 18 upwards. When the lifting plate 30 has reached its uppermost position, its upper side is flush with the main working level 10.

A mold cavity 32 is delimited by the mold core 16 and the mold jacket 22 and the lower sleeve 20, which has an annular region 32a and above it a disc-shaped region 32b. A concrete filling and distribution device 34 is assigned to the molding device described so far, which is shown in plan view in FIG. 2. The latter comprises a concrete feed belt 34a which can be pushed in the direction of arrow 34b with its discharge end 34c over the molding space 32 and is combined with a rotating distributor star 34d. The distributor star 34d is surrounded by a filling ring 34e. If the concrete delivery belt 34a has its discharge end 34c above the mold cavity 32, it can throw fresh concrete supplied in the direction of the arrow 34b into the mold cavity 32. The distributor star 34d thereby distributes the concrete in the disk-shaped region 32b, from which it then extends at the edge the concrete falls into the annular area 32a. It should be noted at this point that a lost formwork plate 36 rests on the upper side of the mandrel 16 and is fixed so far that it maintains its position according to FIG. the fixation is made so that the lost formwork 36 can be lifted vertically upwards from the mandrel 16 without further notice. For example, the fixation is made by pins. The concrete is first poured around the edge of the lost formwork 36 into the annular mold cavity area 32a, and then the disk-shaped area 32b is filled in, so that the entire mold cavity 32 is ultimately filled. The concrete is compacted by vibration during and after the filling process. The concrete filling device 34 is then pulled back into the position shown in FIG. 2, and the concrete filling is smoothed on the level of the collar 24. The molded jacket 22 is then pulled upwards by means of the lifting device 26 from the molded product, while the molded product continues to rest on the lower sleeve 20 and thus on the support 18. The molded jacket 22 is set so high relative to the level of the working plane l0 that the distance between the lower edge of the molded jacket and the working surface l0 is greater than the sum of the vertical dimensions of the lower sleeve 20 and the finished molded article.

Subsequently, the lower sleeve 20 is raised by means of the lifting device 28 and the lifting plate 30 and, together with the molded article, is shifted upwards relative to the mold core 16 which is arranged at a fixed height, until the lower edge of the lower sleeve 20 is just above the work surface 10. Then the molding still resting on the lower sleeve 20 can be moved laterally along the work surface 10 to a binding station. The state shown in Fig. 1 is then restored with the introduction of a new sub-sleeve 20 so that another molding cycle can start. The lower sleeves remain as a support for the molding until it is completely hardened.

As shown in Fig. 1a and 2, are to be formed 38 and 40, after turning over of the molding 180 ^o (upside down) are located just above the bottom of the molding, which in the mold cavity portion 32b in the resulting molding passages arose. In Fig. La, the molding F with the lost formwork 36, the bottom 42, the passages 38 and 40 and the jacket 44 can be seen. To form the passages 38 and 40 in the shell 44, passage formation cores 38a and 40a are accommodated between the mold core 16 and the mold shell 22. The passage formation core 38a is attached to the jacket 22, while the passage formation core 40a is attached to the mold core 16. The attachment is done by releasable fasteners (not shown).

When the mold cavity 32 is filled with fresh concrete, the passage formation cores 38a and 40a are enclosed by the concrete forming the casing 44.

In the previously described formwork removal, namely in the first step of the formwork removal, namely the lifting of the molded casing 22 relative to the molded article still resting on the support 18 by means of the lower sleeve 20, the molded casing 22 must separate from the passage-forming core 38a, since this is in the casing part 44 initially remains. For this purpose, fasteners which have fixed the passage-forming core 38a to the mold jacket 22 during filling and shaking must be pulled from the outside of the mold jacket 22.

If the lower sleeve 20 with the resulting molding is then pulled upwards from the mold core 16 later, it must be beforehand, the passage formation core 40a can be detached from the mold core 16, so that the passage formation core 40a with the resulting molding can be displaced upwards relative to the mold core 16 which remains below. For this purpose, fixing means, which held the passage-forming core 40a on the mold core 16 during the filling and shaking process, can be released from the inside.

As can be seen from FIG. 2, it may now be desirable for the passage 40 to be moved to the position 40 '. For this it is necessary to turn the passage formation core 40a into the position 40'a. This twisting can be done by rotating the mandrel 16 in the direction of the double arrow 48. In order to be able to make this rotation, the mandrel 16 is rotatably mounted on the bracket 14 in the direction of the double arrow 48.

A drive motor 50 is provided for rotating the mandrel 16 with respect to the operationally non-rotatable mandrel 22, which is in drive connection with a central shaft 52 of the mandrel 16 via a spur gear.

If a certain angular position of the mandrel 16 with respect to the mold jacket 22 has been established once by means of the drive motor 50, this position can be blocked by a blocking device 54. The blocking device is equipped with a piston-cylinder device or with a lifting magnet and interacts with a flange 56 of the central shaft 52 in a frictional or indexing manner.

Setting and blocking the angular position of the mandrel 16 is possible from a central control panel 58.

A first scheme of remote control is shown in Fig. 4. You can see again the drive motor 50, which over the Helical gear 5l drives the central shaft 52. An angle sensor 60 is connected to the spur gear 5l, which is indicated schematically in FIG. 4 interacts with a part of the spur gear 5l. As shown in FIG. 1, it will expediently act directly on the central shaft 52 or its flange 56.

A subset of the control panel 58 is designated 58a in FIG. This sub-group 58a each includes an elastically biased push button 62a for counterclockwise rotation and a push button 62b for clockwise rotation. A control line 66 leads from the control panel part 58a to an AND gate 68 connected upstream of the drive motor 50.

The angle sensor 60 is connected via a signal line 70 to an angle detector 72, which indicates the respective actual angle of the mandrel 16, by the position of a pointer 72a relative to a scale 72b. At the start of an angle adjustment process for the mandrel 16, the operator at the control panel determines the current actual angular position on the actual angle detector 72 and compares it with the angular value of the desired readjustment of the mandrel 16. Depending on the sign of the angular difference between the actual value and the target value, either the push button 62a or the push button 62b is then pressed. When each of the push buttons 62a and 62b is pressed, the blocking device 54 is released via a control line 74. The release of the blocking device 54 is reported via a signal line 76 to the AND gate 68, so that the drive motor 50 can now start up through the AND gate 68, depending on the depressed push button 62a or 62b in one or the other direction of rotation . The operator then observes the angle detector 72 and keeps the push button under pressure until the angle detector 72 indicates the setting of the actual angle to the desired angle.

5 shows a modified embodiment. Analog components are provided with the same reference numerals as in FIG. 4, each increased by the number 100.

The blocking device l54 is released from a starter button l62, which can be designed to be self-retaining, via a control line l74. The release of the blocking device l54 is reported to the AND gate l68 via the control line l76.

Before that, a certain target angle to which the mandrel 16 should be set has been set in a target angle selector l78. The current setting angle of the mandrel l6 at this point in time is scanned by the actual angle sensor l60 and, via the control line l70, is applied not only to the actual angle detector l72, but also to a comparator l80. The comparator 180 compares the current actual angle value and the target angle value with regard to the sign of the angle value difference and supplies a sign signal to a discriminator l82. Two signal lines l66a, l66b lead from this discriminator l82 to the AND gate l68. Depending on the ascertained sign of the angle value difference, a drive command is sent to the drive motor l50 via one or the other of the signal lines l66a, l66b, with the result that, if the blocking device l54 is released, the drive motor l50 moves the actual angle value in the direction corrected the target angle value set at l78. As soon as equality between the actual angle value and the desired angle value is determined by the comparator l80, the discriminator l82 supplies a standstill signal to the drive motor l50 via one of the signal lines l66a, l66b and furthermore a re-blocking signal to the blocking device l54 via line l76 .

6 shows another embodiment of the remote control. At 250 here is a stepper motor, e.g. B. a electric stepper motor, which in turn adjusts the central shaft 252 of the mandrel l6 via the spur gear 25l. Analog parts are provided with the same reference numerals as in FIG. 4, each increased by the number 200. In a control unit 284, a specific target angle is selected by tapping one of several pushbuttons. A control unit is integrated in the control unit 284, which has memorized the previously set target angle value and forms a control command from the comparison of the older target angle value with the newly entered target angle value Stepper motor 250 is applied via a control line 266. This control command is executed as soon as a starter button 262 is tapped. A control line 274 leads from the starter button 262 to the blocking device 254 and to the drive motor 250. The blocking device 254 is first released. The execution of the command applied by the control unit 284 is then initialized with a delay set by a timer 288. After execution of the command, the blocking device 254 is blocked again.

3 shows a modification to FIG. 1. Analog parts are provided with the same reference numerals as in FIG. 1, each increased by the number 300. In this embodiment, both the mold core 316 and the mold jacket 322 are each arranged at a fixed height on the bracket 314. The lower sleeve 320 here again rests on a support 318 of the mold core 316 or optionally on a support (not shown) of the mold jacket 322. The lower sleeve 320 is dimensioned here so that it can be raised between the mold core 316 and the mold jacket 322. To cook the lower sleeve 320 after the concrete has been filled and compacted in the molding space 332, an ejection 390 is provided, which can be adjusted in height by an adjusting device 392. The ejector 390 is designed with a plurality of rods 390a which pass through an upper yoke 314a of the bracket 3l4 through the lower sleeve 320. After placing the lost formwork 336 and filling the mold cavity 332 and compacting the filled concrete, the ejector 390 is raised so that it pushes the formed product out of the mold cavity 332 via the lower sleeve 320 until the lower edge of the lower sleeve 320 lies above the working surface 3l0 and the lower sleeve 320 can then be moved laterally with the molding.

This embodiment has certain advantages over the embodiment according to FIG. 1 in the manufacture of manhole bases, that is to say pipe parts with a bottom according to FIG.

When using the device according to FIG. 1, the shaped jacket 22 is first raised in the course of demoulding the formed product. The jacket of the tubular blank formed is progressively released from bottom to top. In this state, the jacket area of the tubular molding is still relatively soft plastic and, with the radial expansion of the released zone, can sink slightly downward under the effect of its own weight. The part of this shell part of the molding which lies on the lost formwork 36 and forms the bottom part of the molding and cannot sink downward can separate from this. This can cause hairline cracks in the transition area between the bottom part and the jacket part of the molding, which can lead to leaks. This hairline cracking is excluded in an embodiment according to FIG. 3, since here the jacket part of the molded part formed in the ring region 332a is inevitably displaced upward with the bottom part formed in the disc region 332b of the mold cavity 332.

Claims (15)

Molding device for producing concrete pipes (44) with an axis, in particular concrete pipes with an end wall (42) (manhole bases), which have passages (38, 40) at an angular distance from one another and possibly at an axial distance from one another in the pipe casing (44),
This molding device comprises a mold cavity delimitation (16, 22, 20) with a mold core (16) and a mold jacket (22), which delimit a mold cavity (32) which is annular and can be closed at least at a part of its height, further comprising the annular mold cavity ( 32) essentially radially traversing passage formation cores (38a, 40a) which can be detachably fastened to parts (16, 22) of the mold cavity delimitation (16, 22, 20) which can be rotated relative to one another,
wherein the mold cavity delimitation parts (16, 22) designed for the releasable fastening of the passage-forming cores (38a, 40a) can be adjusted in angle relative to one another about the axis,
and motorized drive means (50) are provided for the angular adjustment of the mold cavity delimiting parts (16, 22), and further optionally include fillers (34) for filling the mold cavity (32) with flowable concrete, compacting agents for compacting the filled concrete and means (26, 28 ) to expose the molding (F) formed in each case and to complete the mold cavity boundary (16, 22, 20) for a further molding cycle after exposure of a molding (F),
characterized,
that the motor drive means (50) are designed with a remote control (58) which permits the setting of a desired setting angle between the mold cavity delimitation parts (16, 22) which can be rotated relative to one another without direct visual monitoring. Molding device according to claim 1,
characterized,
that the remote control (58) comprises a starter (62a, 62b) for the motor drive means (50) an actual angle sensor (60) and at the location of the starter (58a) an actual angle detector (72) which can be monitored by an operator. Molding device according to claim 2,
characterized,
that the motor drive means (50) are designed to be reversible in the direction of rotation and that the starter is assigned a direction of rotation selector (62a, 62b) for the drive means (50). Molding device according to one of claims 2 and 3,
characterized,
that the starter (62a, 62b) is biased towards a standstill position which only allows the drive means (50) to be kept in operation as long as an operator acts on the starter (62a, 62b) against the bias. Molding device according to one of claims 1 and 2,
characterized,
that a target angle selector (178) is provided at the location of a starter (162) for the drive means (150), that an actual angle sensor (160) is provided at the location of the shaping device, that the actual angle sensor (160) and the target angle selector (178) with a comparator (180) are connected and that the comparator (180) is followed by means (182) for stopping the drive means when the setpoint angle and the actual angle are approximately identical (closed loop control). Molding device according to claim 5,
characterized,
that the comparator (180) for determining the sign of a Setpoint / actual angle difference is formed and that the comparator (180) has means for reversing the direction (182) of the drive means (150) connected in dependence on the determined sign. Molding device according to one of claims 1 and 2,
characterized,
that the starter (262) is assigned a setpoint angle sensor (284) and that the drive means (250) are linked to the setpoint angle sensor (284) in such a way that they effect an actual angle setting in accordance with the setpoint angle specification (284) without feedback of the actual angle (open loop control) . Molding device according to one of claims 1 to 7,
characterized,
that a blocking device (54, 56) is assigned to the mold cavity delimiting parts (16, 22), which can be rotated relative to one another, and that this blocking device (54, 56) can be operated remotely, in particular from the same location (58) as the motor drive means. Molding device according to claim 8,
characterized,
that the remote actuation of the blocking device (54, 56) is linked to the remote actuation of the motor drive means (50) in such a way that the motor drive means (50) become driving at or with a time delay after the blocking device (54, 56) has been released or / and that the blocking device (54, 56) becomes effective with or with a time delay after the motor drive means (50) has come to a standstill. Molding device according to one of claims 1 to 9,
characterized,
that the remote control for the motor drive means (50) and possibly also for the remote control of the blocking device (54, 56) can be influenced from a remote control location (58), from which remote control for the fillers and / or for the compression means or / and for the means for exposing the Formlings or / and for the means to complete the mold cavity limitation (16,22,20) is possible. Molding device according to one of claims 1 to 10,
characterized,
that the mutually rotatable parts (16, 22) of the mold cavity delimitation (16, 22, 20) are formed by the mold core (16) on the one hand and the mold jacket (22) on the other. Molding device according to claim 11,
characterized,
that the mandrel (16) can be rotated by the motor drive means (50) and that the mandrel (22) is non-rotatable during operation. Molding device according to one of claims 1 to 12,
characterized,
that the mold cavity (32) can be delimited downwards by a lower sleeve (20) which can be placed on a support (18) which is stationary with respect to the mold core (16) and that the mold jacket (22) with respect to the mold core (16) and the lower sleeve ( 20) is adjustable in height, the means (26, 24) for exposing the molding (F) and for completing a lifting drive (26) for lifting the molding jacket (22) relative to the molding (F) initially remaining on the molding core (16) and one comprise a further lifting drive (28, 30) for lifting the lower sleeve (20) and the molding (F) with respect to the molding core (16). Molding device according to one of claims 1 to 12,
characterized,
that the mold core (316) and the mold jacket (322) are arranged at a fixed height during operation, that a height-adjustable lower sleeve (320) is provided between the mold core (316) and mold jacket (322), which can be supported in a filling position at the lower end of the mold cavity (332) and that the means (390, 392) for exposing the molding (F) from the mold cavity (332) comprise an ejector (390) which engages the lower sleeve (320) from below and with it the molding (F) from the mold cavity (332) allowed to slide upwards. Molding device according to one of claims 1 to 14,
characterized,
that the mold cavity delimitation (16, 22, 20) is arranged below a main work surface (10), via which the fillers and means for removing the moldings (F) are arranged.

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