EP2095933A2 - Powder press and die plate for a powder press - Google Patents

Abstract

The press has a die plate (16) provided with a die opening (20). A plunger pair including a lower plunger and an upper plunger is associated to the die opening. The die plate is locked in a selected position by a self-adjustable clamping device (24) i.e. quick clamp device. The die plate is arranged on a part of a frame. The clamping device has a clamping ring (28) operated via a clamping lever (26). The clamping ring has a material-thick area and a material-thin area that are selectively engaged with a locking pin of the die plate, in corresponding positions.

Description

The invention relates to a powder press and a die plate for a powder press.

Powder presses are well known in various embodiments. These usually include at least one fixed on a machine frame die plate with at least one die opening. Each of the at least one die opening is associated with an upper punch and a lower punch, which can be moved into the matrices by suitable drive means, so that powder previously introduced into the dies is pressed in a known manner. The drive can be done here electrically, hydraulically, pneumatically or in any other suitable manner. For example, known as so-called eccentric presses trained powder presses.

So that different tablet shapes or tablet sizes can be pressed with such powder presses, it is known to arrange interchangeable dies in the openings of the die plate. An exchange of the dies is connected only by extensive disassembly operations of the die plate and corresponding extensive re-assembly operations of the die plate. In particular, since exact positioning is required for exact alignment of the die opening to lower and / or upper punch, this is associated with complex calibration and adjustment work.

The invention is therefore an object of the invention to provide a powder press of the generic type and a die plate of the generic type such that in a simple way an exchange of the die plate is possible.

According to the invention the object is achieved by a powder press with the features mentioned in claim 1. Due to the fact that the at least one die plate is locked or can be locked in a defined position by means of a clamping device, it is advantageously possible to position the die plate without tools on the powder press or to remove it from the powder press. This simple installation or removal of the die plate can be replaced, cleaned and / or edited. Also, an exchange of at least one Matrizenöffnung arranged in the die plate matrices, for example, to change a tablet shape and / or tablet size in a simple manner possible.

In a preferred embodiment of the invention it is provided that the tensioning device is a quick-release device. By means of this quick-release device, the die plate can be solved or fixed virtually with a handle.

In a further preferred embodiment of the invention it is provided that the at least one die plate on a machine frame, in particular a part of a machine frame of the powder press can be arranged. As a result of the clamping device of a defined positive and / or non-positive connection of the die plate with the machine frame of the powder press is possible, so that even during operation of the powder press the die plate maintains the defined position to the associated pair of punches.

In addition, it is provided in a preferred embodiment of the invention that the clamping device is self-adjusting. As a result, a defined reproducible positioning of the die plate is possible in a particularly simple manner. Due to the self-adjustment of the clamping device, the die plate is always locked in the desired defined position.

In a further preferred embodiment of the invention, it is provided that the clamping device comprises a clamping lever and an actuatable via the clamping lever clamping ring, wherein the clamping ring is preferably engageable with locking pins of the female plate into engagement. As a result, a secure locking of the die plate is possible in a particularly simple manner.

In a further preferred embodiment of the invention it is provided that the clamping ring has thicker material areas and weaker material areas, which can be brought selectively in corresponding positions with the locking pin. This makes it possible in a simple manner to achieve by locking the clamping ring on the clamping lever to a defined rotation angle range, the locking or unlocking of the die plate. At the same time in addition to the locking or unlocking a removal position during the unlocking position for the die plate allows so that it can be easily removed and replaced.

Further, in a preferred embodiment of the invention, it is provided that the clamping device comprises an adjusting ring which is non-positively and / or positively connected in a defined position with the machine frame or the part of the machine frame, wherein preferably the adjusting ring and the locking pins have corresponding mating surfaces, which allow defined position of the die plate. This advantageously makes it possible to support the self-aligning positioning of the die plate in the powder press. Due to the corresponding mating surfaces incorrect assembly of the die plate is excluded.

In a further preferred embodiment of the invention, it is provided that the clamping device or at least part of the clamping device forms a start-up protection for the powder press. This will ensure that the powder press is not put into operation if the die plate is not properly positioned and clamped. The reliability of the powder press is thus significantly increased.

The object is further achieved by a die plate having the features mentioned in claim 11. Characterized in that the die plate comprises means by which the die plate can be arranged by means of a clamping device in a defined reproducible position on a powder press, is advantageously achieved that standardized die plates can be provided which can be locked optionally on different powder presses. In particular, this means that the powder presses can be quickly converted to other tablet sizes and / or tablet shapes by exchanging the die plates or the at least one die arranged in the die plate. A readjustment of the punch, that is, the upper punch and / or the lower punch to the die opening is not required, as always achieved by the defined reproducible position of the die plate with respect to the powder press exactly the same positioning. The effort to replace the die plate is expressed by the clamping device, in particular the quick release device expresses low.

According to the invention it is thus provided that the die plate by means of a clamping device, in particular a quick-release device, on the machine frame or a bearing block of the machine frame is positionable. Here, a self-adjusting clamping device is used in particular in a simple manner, so that an exact position of the die plate and thus the die opening or the die arranged in the die opening is possible in a reproducible manner.

Figur 1

eine schematische Ansicht einer Exzenterpresse;

Figur 1a

eine schematische Perspektivansicht der Exzenterpresse;

Figuren 2 bis 10

verschiedene Ansichten einer Matrizenplatte beziehungsweise der Befes tigung der Matrizenplatte an einem Lagerbock eines Maschinengestells der Exzenterpresse.

The invention will be explained in more detail in an embodiment with reference to the accompanying drawings. Show it:

FIG. 1

a schematic view of an eccentric press;

FIG. 1a

a schematic perspective view of the eccentric press;

FIGS. 2 to 10

different views of a die plate or the fastening of the die plate to a bearing block of a machine frame of the eccentric press.

FIG. 1 schematically shows an eccentric press 10, for example a tablet press. Structure and operation of eccentric presses are well known, so that will not be discussed in detail.

The eccentric press 10 comprises a machine frame 12 and a bearing block 14 on which a die plate 16 - as will be explained in more detail - is releasably attached. The die plate 16 has an in FIG. 1 non-visible die opening 20 into which via a filling shoe 18 a mass to be pressed can be introduced. The introduced into a die 36 powder mass is then pressed by means of a lower and upper punch, so that a tablet or the like is formed.

The eccentric press 10 has the massive machine frame 12, on which a guide 54 for a lower punch and a guide 56 are fixedly arranged for a punch. On the lower guide 54 of the bearing block 14 of the die table 16 is arranged. On the representation of the lower punch and upper punch was omitted for reasons of clarity, with their arrangement is well known.

On the top of the die table 16, the filling shoe 18 is movably arranged, on which a dusting device 58 is fixedly mounted. The filling shoe 18 with the device 58 attached to it can be moved back and forth between a parking position A and a filling position B. On the drive of the filling shoe 18 will not be discussed in detail at this point, since this is known per se.

The filling shoe 18 has a filling container 60 for the material to be pressed. The filling container 60 is closed with a lid 62, in which an opening is provided, which provides for an atmospheric pressure in the filling container 60. The filling shoe 18 includes a base housing 64 to which the device 58 is attached. The base housing 64 has in its interior a filling opening (not shown) which is oriented towards the surface of the die plate 16 and is positioned in the filling position B of the filling shoe 18 above the die opening 20, so that a filling process with the material to be pressed in known Way is possible.

A rotary handle 66 serves, for example, for adjusting filling parameters of the filling shoe 18, which are not to be considered in detail here.

FIG. 1a shows a perspective view of the eccentric press 10th

The filling shoe 18 is in its parking position A, so that the die opening 20 is openly accessible. In this position of the filling shoe 18, the lower punch (not shown) guided in a guide cylinder 68 of the lower punch guide 54 is inserted into the die 16 so far that above its effective punch surface the filled press material into the die opening 20 has a space provided. In a next machine cycle, the upper punch, which is displaceably mounted and guided in an adequate guide cylinder 68, can then be pressed with a predetermined force into the die opening 20 from above, so that a tablet is pressed.

After a tablet is finished, the top punch is raised to free the work area. The lower punch is also raised until the finished tablet is pushed out of the die opening 20 and lies, for example, in the plane of the upper surface of the die plate 16.

Next, the filling shoe 18 is set in motion in the direction of its filling position B, so that the side edge of the dusting device 58 fixedly attached to it pushes and ejects the tablet.

In the context of the present invention will be discussed in more detail below on the die plate 16 and its attachment to the bearing block 14.

FIG. 2 illustrates that the die plate 16 has the die opening 20 into which a die 36, not shown here, can be locked via fastening means 22. The die 36 ultimately determines the shape and size of the tablet to be pressed in a known manner.

The die plate 16 is detachably connected to the bearing block 14 via a tensioning device 24. The tensioning device 24 comprises a tensioning lever 26 and a tensioning ring 28, by means of which the releasable connection between the die plate 16 and the bearing block 14 can ultimately be produced. For this purpose, the clamping lever 26 in the direction of arrow 30 is rotatable.

FIG. 3 shows a sectional view through the arrangement according to FIG. 2 , It becomes clear that the bearing block 14 has a passage opening 15 through which the lower punch can engage in the die opening 20. The die plate 16 has on its underside, that is, the bearing block 14 side facing locking pins 32 which engage in a receiving opening 17 of the bearing block 14. The pins 32 have outwardly directed U-shaped grooves 19 whose dimensions are matched to the dimensions of the clamping ring 28. In the in FIG. 3 shown, locked position, the clamping ring 28 engages in the grooves 19 of the pin 32 and locks it, so that the die plate 16 is biased with a clamping force against the bearing block 14 and thus assumes a fixed, defined, unchangeable position.

FIG. 4 shows in a schematic perspective view of the arrangement in an unlocked position. It can be seen that the tensioning lever 26 opposite to in FIG. 2 is pivoted (double arrow 30), so that also the clamping ring 28 relative to the pin 32 (FIG. FIG. 3 ) emotional. As a result, the clamping ring 28 is disengaged from the grooves 19 of the pins 32, as in the sectional view in FIG FIG. 5 clarifies is. This is achieved in that the clamping ring 28 seen over its circumference material thicker and weaker material areas forms. For unlocking enters a weaker material portion of the clamping ring 28 in a corresponding position with the pins 32, while in the locked position, the thicker material areas of the clamping ring 28 in a corresponding position with the pins 32, as shown in FIG. 3 is shown.

In FIG. 6 is illustrated how the die plate 16 as shown above, can be removed from the bearing block 14. The pins 32 are fastened to the die plate 16 and can be moved out of the opening 17 of the bearing block 14, whereby they are guided past the clamping ring 28. The die plate 16 can now be removed from the eccentric press 10, for example, to be exchanged for another die plate 16 with another die opening 20. It is also possible to change a matrix 36 arranged in the die opening 20 outside the eccentric press 10 and then subsequently to connect the die plate 16 again to the bearing block 14 via the clamping device 24. This is done in reverse order, that is, the die plate 16 is inserted with the pin 32 in the opening of the bearing block 14. Subsequently, the clamping lever 26 is moved in the direction of arrow 30 in the direction of the die plate 16, so that the clamping ring 28 comes with its thicker material areas in engagement with the grooves 19 of the pin 32. There is virtually a connection in the manner of a bayonet closure.

FIG. 7 shows in an exploded view of the structure of the pins 32 which are connected via connecting means, such as screws 34, frictionally with the die plate 16. Into the die opening 20, a die 36 indicated here is fitted by means of the screws 22.

FIG. 7 further shows an adjusting ring 38 which is positively and / or non-positively connected to the bearing block 14 via connecting means 40 indicated here. The bearing block 14 forms for receiving the Justierringes 38 a corresponding step-shaped contact surface.

The adjusting ring 38 has outwardly facing U-shaped recesses 42, which are adapted in their internal dimensions to the outer dimensions of the pins 32. Here are the Outside surfaces of the pins 32 and the inner surfaces of the U-shaped recesses 42 mating surfaces 44 are provided, which lead to a self-aligning positioning of the pins 32 in the Justierring 38, so that the die plate 16 a reproducible reproducible defined position with respect to the bearing block 14 and thus in Reference to the entire eccentric press 10 occupies.

FIG. 8 clarifies once again the main components of the illustrated clamping device 24. It is clear that the adjusting ring 38 is fixedly disposed in a corresponding recess of the bearing block 14. The clamping ring 28, as it were, surrounds the adjusting ring 38 and can be moved in or out past the recess 17 of the bearing block 14. In FIG. 8 It is clear that the clamping ring 28 has the weaker material portions 46 and the thicker sections 48. If the weaker material portions 46 in a corresponding position with the pins 32 (in FIG. 8 not shown) and the U-shaped recesses 42 of the adjusting ring 38 are brought, both the die plate 16 and the clamping device 24 can be removed upwards.

In the Figures 9 and 10 In each case, the arrangement of the die plate 16 in a press room cladding 50 is shown schematically. FIG. 9 shows a closed press room cover 50, so that the die plate 16 and the clamping device 24 is disposed entirely within the space formed by the pressing chamber 50 interior.

Based on the illustration in FIG. 10 It is clear that the tensioning lever 26 at the same time takes over a safety function in addition to the clamping function. When not tensioned clamping device 24, the clamping lever 26 is in the in FIG. 10 shown position. This position prevents the protective cover 52 of the press room cover 50 from being able to be closed. Thus, a commissioning of the eccentric press 10 without firmly clamped die plate 16 (in FIG. 10 shown in the lifted position) excluded.

By closing the guard 52, for example, a switching means is actuated, which only allows commissioning of the powder press.

LIST OF REFERENCE NUMBERS

10

eccentric

12

machine frame

14

bearing block

15

Through opening

16

die plate

17

receiving opening

18

filling shoe

19

groove

20

die opening

22

fastener

24

jig

26

clamping lever

28

clamping ring

30

Arrow direction, (double arrow)

32

spigot

34

screw

36

die

38

Adjusting ring

40

connecting means

42

U-shaped recess

44

mating surface

46

sections

48

sections

50

Press paneling

52

guard

54

guide

56

guide

58

contraption

60

Storage capacities

62

cover

64

base housing

66

rotary handle

68

guide cylinder

Claims (11)

Powder press comprising at least one die plate (16) with at least one die opening (20), wherein the at least one die opening (20) is associated with a pair of dies with a lower punch and an upper punch,
characterized in that
the at least one die plate (16) by means of a clamping device (24) is locked in a defined position, or can be locked. Powder press according to claim 1,
characterized in that
the tensioning device (24) is a quick-release device. Powder press according to one of the preceding claims,
characterized in that
the at least one die plate (16) can be arranged on a machine frame (12), in particular a part of the machine frame (12) of the powder press. Powder press according to one of the preceding claims,
characterized in that
the tensioning device (24) is self-adjusting. Powder press according to one of the preceding claims,
characterized in that
the tensioning device (24) comprises a tensioning lever (26) and a tensioning ring (28) which can be actuated via the tensioning lever (26). Powder press according to one of the preceding claims,
characterized in that
the clamping ring (28) with locking pin (32) of the die plate (16) is engageable. Powder press according to one of the preceding claims,
characterized in that
the clamping ring (28) has material-thicker areas (46) and weaker-material areas (48) which can be selectively brought into corresponding positions with the locking pins (32). Powder press according to one of the preceding claims,
characterized in that
the tensioning device (24) comprises an adjusting ring (38) which is non-positively and / or positively connected in a defined position with the machine frame (12) or the part of the machine frame (12). Powder press according to one of the preceding claims,
characterized in that
the adjusting ring (38) and the locking pin (32) corresponding mating surfaces (44) which allow the defined position of the die plate (16). Powder press according to one of the preceding claims,
characterized in that
the tensioning device (24) or at least part of the tensioning device (24) forms a start-up protection for the powder press. Die plate (16) for a powder press with at least one die opening (20),
characterized in that
the die plate (16) comprises means by which the die plate (16) can be arranged by means of a tensioning device (24) in a defined reproducible position on a powder press.

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