WO2019161422A1

WO2019161422A1 - Holder for a dipping mould

Info

Publication number: WO2019161422A1
Application number: PCT/AT2018/000100
Authority: WO
Inventors: Tobias Kienreich
Original assignee: Faigle Kunststoffe Gmbh
Priority date: 2018-02-20
Filing date: 2018-12-21
Publication date: 2019-08-29
Also published as: AT520631A4; CN111712361A; AT520631B1

Abstract

The invention relates to a holder for a dipping mould (7), comprising: a holding unit (14) having at least one clamping projection (14c, 14d); a pressing unit (20) which can be displaced relative to the holding unit (14) and which is acted upon by a spring (21), wherein a portion of the dipping mould (7) can be clamped between the at least one clamping projection (14c, 14d) of the holding unit (14) and a pressing surface (20e) of the pressing unit (20); and a connection unit (8) for connecting the holder to a supporting arm (5) supporting the holder, wherein the connection unit (8) has an axial pin (11). The axial pin (11) penetrates an axial through-opening of the holding unit (14), wherein the holding unit (14) is rotatably mounted on the axial pin (11) about a rotational axis (6).

Description

Holder for a diving form

The invention relates to a holder for a dip mold, comprising a holding unit with at least one clamping projection, one with respect to the

Holding unit displaceable, acted upon by a spring pressure unit, wherein a portion of the dip mold between the at least one clamping projection of the holding unit and a pressing surface of the pressing unit can be clamped, and a connection unit for connecting the holder with a support arm carrying the holder, wherein the connection unit has an axle pin.

Dipping forms are used in particular for the production of latex products, such as

Gloves used. For transporting the dipping forms by different stations of a production line serve conveyor chains, with which the

Dipping forms are connected via a carrying device. The stations of such a production line include i.a. Dipping baths containing polymer materials, in particular natural or synthetic latex materials, in which the molds are immersed.

Holder for dip forms, which a holding unit and one opposite the

Holding unit displaceable, acted upon by a spring pressure unit, wherein a portion of the dip mold between at least one

Clamping projection of the holding unit and a pressing surface of the pressing unit can be clamped, for example, from WO 2015/142155 A1 and MY-163101- A emerge. A respective holder has a holding unit which has a shaft, protruding at its front end on opposite sides

Clamping projections are provided. On the shaft, a pressing unit is arranged displaceably, which is acted upon by a coil spring also arranged on the shaft. To attach a dip mold to the holder, the pressure unit is pushed back against the force of the spring (using a special pneumatic pliers), whereupon a front end portion of the shaft with the clamping projections can be inserted through an elongated opening in the bottom of the dipping mold. Subsequently, the dipping mold is rotated by 90 ° and the pressure unit is released, whereupon the bottom of the dipping mold between the clamping projections of the holding unit and a pressing surface of the pressing unit is clamped.

The holder is supported by an L-shaped support arm, wherein the shaft of the holding unit relative to the support arm about the longitudinal central axis of the shaft is rotatable. For this purpose, two ball bearings are arranged on a rear end portion of the shaft, which are inserted into a bushing portion of the support arm.

Two L-shaped support arms whose L-legs carrying the holder in

have opposite directions, are mounted together on a support shaft about a horizontal axis parallel to the conveyor chain pivotally. Such support arms carrying support shafts are attached to the chain links at regular intervals on both sides of the conveyor chain.

A disadvantage of such prior art holders is that the ball bearings, which support the holding units rotatable relative to the support arms, are exposed to a considerable wear. However, an exchange of such ball bearings requires an interruption of the operation of the system to perform the appropriate maintenance.

From CN 104802351 A, a holder for a dip mold emerges, in which a connection unit for connecting the holding unit with a support arm carrying the holder has an axle pin. On this two ball bearings are arranged, on which a pressing unit is rotatably mounted, which has a pressing surface. Compared to the pressure unit, a holding unit with clamping projections is displaceably mounted against the force of a spring. On

Section of the dip mold can be clamped between the clamping projections of the holding unit and the pressing surface of the pressing unit. Again, it comes to a considerable wear of the ball bearings.

The object of the invention is to provide an improved holder of the type mentioned. This is achieved by a holder with the invention

Features of claim 1.

In the case of the holder according to the invention, the connecting unit serving to connect the holder to a support arm carrying the holder has an axle pin which passes through an axial passage opening of the support unit, wherein the support unit is rotatably mounted on the axle pin about a rotation axis.

The connection unit can advantageously be used for connection to the

Be adapted female portion of a trained conventionally support arm. An existing system is thus in a simple way with a

retrofittable holder according to the invention. The axle of the connection unit forms a rigid axle, on which a rotatable mounting of the holding unit is made possible with only a slight occurring wear.

In an advantageous embodiment, at the two ends of the

Holding unit bearing elements for rotatably supporting the holding unit may be provided on the axle of the connection unit.

In a holder according to the invention, a relatively large axial distance between bearing elements for rotatably supporting the holding unit on the

Axle pin be provided, whereby the forces acting on the bearing elements moments can be kept relatively small. In particular, the bearing elements may be plain bearing sleeves, which are inserted into a respective end portion of the penetrated by Achsstift passage opening through the holder. It is thereby a stable, low-wear and cost-effective training possible.

The pressing unit is advantageously arranged on a shaft of the holding unit, through which the passage opening extends through the holding unit. In particular, the spring acting upon the pressing unit can be a helical spring arranged on the shaft, which is supported on the one hand on the pressing unit, on the other hand on a supporting part arranged on the shaft. This support member may be attachable in an advantageous embodiment by a plug-in rotary movement on the shaft, wherein locking elements of the shaft engage with counter-locking elements of the support member. This makes it easy to install and, if necessary,

Dismantling possibility created.

It is advantageously provided that a front end section of the holding unit, which has at least one clamping projection, can be inserted through an opening in a bottom of the dipping mold, whereby the bottom of the dipping mold can be clamped between the at least one clamping projection and the pressing surface of the pressing unit. Dipping forms of this type, which are formed in particular of ceramic, are usually used for the production of gloves

used.

The holding unit and the pressure unit can advantageously be made of plastic.

Further advantages and details of the invention are explained below with reference to the accompanying drawings. In this show:

Figure 1 shows a portion of a conveyor chain with attached supporting devices for diving forms for the production of gloves, in oblique view.

2 shows one of the support devices comprising holder according to the invention

Dip molding;

3 shows a section through the carrying device with parts of the dipping forms held by the holders, section line AA of FIG. 4;

4 shows a section along the section line BB of Figure 3, wherein the remaining part of the dip mold is indicated by a dashed line ..;

5 and 6 are exploded views of the holder from different angles; 7 and 8 are oblique views of the holder, wherein the arranged on the connection unit parts of the holder are shown removed from the connection unit;

Fig. 9 is a plan view of the top of the holder;

Fig. 10 is a section along the line CC of Fig. 9;

Fig. 1 1 is a section along the line DD of Fig. 9;

12 is an oblique view of the holder and a part of the dip mold, in the separate state of the holder form of the dip mold;

Fig. 13 is a representation corresponding to FIG. 12, the parts but partially

cut;

Figs. 14-17 are views corresponding to Figs. 10-13, wherein the pressing unit is pushed back and in Figs. 16 and 17, the front end portion of the holding unit is inserted through the opening in the bottom of the dipping mold;

FIG. 18 is an illustration corresponding to FIG. 17, wherein the dip mold is rotated by 90 ° and pushed onto the centering projection of the pressure unit; FIG.

FIG. 19 is an illustration corresponding to FIG. 18, wherein the immersion mold is clamped to the holder, that is to say mounted on the holder; FIG.

Figures 20 and 21 are views corresponding to Figures 14 and 15, wherein the holder assumes the state of Figure 19, but without the dip mold.

Fig. 22 is a plan view of the parts of the holder to be mounted on the connection unit, before the connection of the support part to the holding unit;

Fig. 23 is a section along the line EE of Fig. 22;

Fig. 24 is an oblique view of the parts of Fig. 22, taken along the line FF in Fig. 22;

Fig. 25 is an oblique view of the parts of Fig. 22 from a different angle, cutting the parts apart from the holding unit along the line GG of Fig. 22; Figs. 26 and 27 are illustrations corresponding to Figs. 24 and 25, wherein the

Supporting member is pushed onto the shaft of the holding unit;

Figs. 28 and 29 are views corresponding to Figs. 26 and 27, wherein the support member is rotated by 90 ° with respect to the holding unit;

30 and 31 representations corresponding to FIGS. 28 and 29, wherein the

Supporting part is released and the locking elements of the shaft with the Counter locking elements of the support member are engaged.

The figures have different scales.

From a conveyor chain 1 for transporting dipping forms through various stations of a production plant for plastic gloves, in particular

Rubber gloves, a section is shown in Fig. 1. The mentioned stations include i.a. Dipping baths in which the dipping forms are immersed, as is known.

The immersion forms, not shown in Fig. 1 are supported by supporting devices, which are connected to the conveyor chain 1. These support devices comprise support shafts 3 connected to the link plates of the conveyor chain 1, support arms 5 carried by the support shafts 3 and supports 2 supported by the support arms 5 for the immersion forms. For example, 1 attachment stub can be welded to the chain straps of the conveyor chain, on which the support shafts 3 are attached.

At the free ends of the support shafts 3 are from these on opposite sides bearing pin 4 horizontally. The journal 4 are in this case parallel to the longitudinal extent of the conveyor chain 1. On each of the bearing pin 4 a here L-shaped support arm 5 is pivotally mounted about the longitudinal axis of the bearing pin 4. The support arms 5 are thus pivotable about horizontal, parallel to the longitudinal extent of the conveyor chain 1 axes.

At the ends remote from the support shaft 3, the support arms 5 each have a bushing section 5a, which serves for connection to a respective holder 2.

The held by the holders 2 Tauchformen 7, which in particular of

Ceramic molds can be formed, can be formed in a known manner. In Fig. 3 sections of the immersion molds 7 are shown in the region of their connection with the respective holder, in Fig. 4 is the remaining part of a dip mold

shown schematically with dashed lines. Each of the diving forms 7 has a bottom 7a, through which an elongated opening 7b leads into an inner cavity of the immersion mold 7, so that the bottom 7a of the immersion mold 7 can be clamped to the holder 2 by means of clamping projections 14c, 14d of the holder inserted through the opening 7b.

With the holders 2 in a known manner cooperating guide means of the system are not shown in the figures. By rail-shaped

Guide means acting on the holder 2 when the holder 2 by means of

Conveyor chain are moved, the support arms 5 can be pivoted about their horizontal axes. The holders 2 roll on the rail-shaped guide means with a circular-cantilever-shaped support surface 20a, wherein the

Dipping forms 7 are rotated about axes of rotation 6, which coaxial with the

Longitudinal axis of the socket portion 5a lie

A respective holder 2 has a connection unit 8, via which it is connected to one of the support arms 5. For this purpose, a connection piece 8a of

Connection unit 8 inserted into the socket portion 5a and with a

Circlip 10, in a in the inner wall of the female portion 5a

introduced groove engages held in the socket portion 5a. The connecting piece 9 in this case has a support disk 9a, which is located at a bottom of the

Socket portion 5a is supported, and a block 9b, which in the

Socket portion 5a is inserted and its outer peripheral contour is adapted to the inner peripheral contour of the female portion 5a and cooperates with the securing ring 10.

The connecting piece 9 is preferably made of plastic, in particular an injection-moldable thermoplastic.

With the connection piece 9, an axle 1 1 is connected, which consists in particular of steel. For this purpose, the axle pin 11 is inserted into an axial passage opening through the connector 9 and a threaded portion 1 1 a of the axle pin 1 1 is bolted to a nut 12 made of metal, which in an end portion of Through hole is pressed through the connector 9, wherein the nut 12 is secured by means of a snapped onto a groove in the axle pin 1 1 clip against loosening. On the side facing away from the nut 12 side of the connecting piece 9 of the axle pin 1 1 stands out of the connector 9 and forms a rigid axle for rotatably supporting a holding unit 14 of the holder 2. The holding unit 14 (with an attached to her immersion mold 7) is thus at the axis of rotation 6 relative to the connecting unit 8 and thus relative to the support arm 5 rotatable.

The holding unit 14 has for rotatable mounting on the axle 1 1 an axial passage opening 14a, which is penetrated by the axle 1 1. At the two axial ends of the holding unit 14 serving for rotatable mounting of the holding unit 14 on the axle pin 11 bearing elements 15, 16 are provided. In the exemplary embodiment, these are plain bearing sleeves, which are inserted into a respective end section of the passage opening 14a through the holding unit 14.

The holding unit 14 has a shank 14b on which clamping projections 14c, 14d are arranged in the region of its front end, that is to say remote from the connecting piece 9, which project radially beyond the shank 14b on opposite sides. For this purpose, in the exemplary embodiment, the holding unit has an end piece arranged on the shaft 14b (which is preferably formed integrally with the shaft 14b), which forms the clamping projections 14c, 14d.

In the exemplary embodiment, the holding unit 14 thus consists entirely of plastic. It would also be conceivable and possible, for example, for the clamping projections 14c, 14d to be formed by a metal plate arranged on the shank 14b, which has sections projecting from the shank 14b on both sides.

The clamping projections 14c, 14d serve to clamp the bottom 7a of the

Immersion mold 7, as described in more detail below.

For axial securing of the holding unit 14 on the axle pin 1 1 is a screwed onto a threaded portion 11 b of the axle pin 1 1 nut 17 made of metal. These is secured by an on a groove of the axle pin 1 1 snapped clip 18 against unintentional release. The nut 17 is pressed into a nut 19 made of plastic. By turning the nut 19, the nut 17 thus (after overcoming the resistance by the clip 18) from the axle 1 1

be unscrewed, whereby the rotatably mounted on the axle 1 1 unit from the axle 1 1 can be removed, see. Fig. 7 and 8. This unit can be advantageously also taken apart, see the

Description below.

On the shaft 14b, a pressing unit 20 is arranged, which is against the force of a spring 21 formed in the form of a helical spring relative to the shaft 14b in the axial direction of the shaft (ie in the direction of the axis of rotation 6) displaceable. The spring 21 is supported at one end on the pressing unit 20 and at the other end on a supporting part 22. The support member 22 is also disposed on the shaft 14b and secured against displacement toward the fitting 9 by cooperating latch members 14e, 14f and counter latch members 22a, 22b, as described in more detail below. The support member 22 is preferably made of plastic.

The rotatably mounted on the axle pin 1 1 unit thus includes the FHalteinheit 14, the pressure unit 20, the spring 21 and the support member 22. The rotatable mounting takes place by means of the already mentioned bearing elements 15, 16. A respective

Bearing element 15, 16 simultaneously forms a radial bearing relative to the axle pin 11 and a thrust bearing, which supports the rotatably mounted on the axle pin 1 1 unit in the axial direction of the axle pin 1 1. In this case, an axially aligned surface of the bearing element 15 cooperates with an end face, axially aligned surface of the connecting piece 9 (in the sense of a sliding bearing) and an axially aligned surface of the bearing element 16 cooperates with an end face, axially aligned surface of the nut 17 (in the sense of plain bearing).

The holding unit 14 is thus held immovably in the axial direction of the axle pin 1 1 relative to the axle pin 1 1. The pressing unit 20 has a cylindrical wall whose outer surface forms the cylinder jacket-shaped bearing surface 20a, with which the holder 2 can roll on a rail-shaped guide means. In the exemplary embodiment, the pressing unit 20 has a base part 20 b made of plastic, which is the

Support surface 20a has. The base part 20b is forward through a

Covering disc 20c covered, wherein the base part 20b has a centering projection 20d, which passes through a window opening in the cover plate 20c.

The operation of the holder 2 for holding a dip mold 7 is in

Explained below with reference to FIGS. 9-21.

9 to 13 show a basic state of the holder 2, which this occupies when - apart from gravity - no external force acting on the holder 2 and no immersion mold 7 is held by the holder 2. In FIGS. 12 and 13, that section of a dip mold 7, in which the attachment of the dip mold 7 to the holder 2, is additionally shown below the holder 2, is shown.

In order to fix the immersion mold 7 on the holder 2, the pressure unit 20 is pushed back against the force of the spring 21, so that they are away from the clamping projections 14c, 14d, cf. 14 and 15, and the dip mold 7 is pushed with its opening 7b on the holding unit 14, so that the clamping projections 14c, 14d pass through the opening 7b in the bottom 7a in the interior of the dip mold 7, see. 16 and 17. In other words, a front end portion of the holding unit 14 having the clamping projections 14c, 14d is inserted through the opening 7b in the bottom 7a of the dip mold 7.

The immersion mold 7 is rotated in the sequence by 90 ° about its longitudinal axis. The

Longitudinal axis of the dip mold 7 is in this case with the axis of rotation 6 of the holding unit 14 on a common straight line. The opening 7b of the immersion mold 7 can now be pushed onto the centering projection 20d of the pressing unit 20, whereby the bottom 7a of the immersion mold 7 in contact with the pressing surface 20e of Pressing unit 20 passes, see. Fig. 18.

The pressing unit 20 is now released so that it is pressed by the spring 21 with the pressing surface 20 e against the outside of the bottom 7 a, which is pressed with its inner side against the clamping projections 14 c, 14 d. In other words, the bottom 7a between the pressing surface 20e of the

Clamping unit 20 and the clamping projections 14c, 14d clamped, see. Fig. 19. The state which the holder 2 occupies when a submersible mold 7 is attached to it is also shown in Figs. 20 and 21 (for the sake of clarity, here without the immersion mold).

The removal of the dipping mold 7 from the holder 2 takes place in the reverse

Order, i. First, the pressing unit 20 is pushed back against the force of the spring 21, then the dipping mold 7 from the centering projection 20 d

lifted and rotated by 90 °, after which the holding unit 40 with the

Clamping projections 40c, 40d can be pulled out through the opening 7b in the bottom 7a.

In the state attached to the holder 2, the immersion mold 7 is rotatable together with the holding unit 14 about the axis of rotation 6. The connecting unit 8 is in this case held non-rotatable relative to the support arm 5.

The assembly of the pivotable mounted on the axle 11 unit comprising the holding unit 14, the pressing unit 20, the spring 21 and the support member 22 will be explained below with reference to FIGS. 22 to 31.

22 to 25 show the state in which the pressing unit 20 and the spring 21 are pushed onto the holding unit, the support member 22 but only loosely rests on the remote from the pressing unit 20 end of the spring 21. The pressing unit 20 assumes its position as far advanced as possible, in which the centering projection 20d bears against the clamping projections 14c, 14d. On the shaft 14b of the holding unit 14 locking elements 14e, 14f are arranged, which are formed by radially outwardly projecting projections. in the

Embodiment, two arranged on opposite sides of the shaft 14b locking elements 14e, 14f available.

The support member 22 has counter-locking elements 22a, 22b, which are formed by radially inwardly projecting projections on the inner circumferential surface of the support member 22. In the exemplary embodiment are two opposite

Counter locking elements 22a, 22b available.

In the illustrated in FIGS. 22-25 rotational position of the support member 22 are the locking elements 14e, 14f and counter-locking elements 22a, 22b at different angular positions with respect to the direction of rotation about the axis of rotation 6, so that they press the support member 22 against the force of the spring 21st can be passed by each other. The position of the parts in the passing state of the locking elements 14e, 14f and counter locking elements 22a, 22b is shown in FIGS. 26 and 27.

As a result, the support member 22 is rotated by 90 ° (clockwise with respect to the rear view corresponding to FIG. 22). This position is shown in FIGS. 28 and 29. As a result, when the support member 22 is released, the counter-locking elements 22a, 22b come by the force of the spring 21 in abutment with the locking elements 14e, 14f and are pressed against this and the assembled state is prepared, in Figs. 30 and 31 is shown.

Advantageously, the rotational position of the support member 22 in the assembled state by engaging cams 14g and recesses 22c of

Locking elements 14e, 14f and counter locking elements 22a, 22b secured.

A disassembly of the unit can be done in the reverse order, ie first by pressing the support member 22, then rotation of the support member 22 by 90 ° (counterclockwise with respect to FIG. 22) and then releasing the Supporting part 22.

Stop webs 22d, 22e on the inner circumferential surface of the support member 22 limit the pressing of the support member 22 and the rotation of the support member 22 relative to the holding unit 14th

Due to the rotatable mounting of the holding unit 14 by means of the axle pin 11 as a rigid axle and arranged on the axle pin 11, spaced apart in the axial direction bearing elements 15, 16 acting in operation on the bearing elements 15, 16 moments and thus their wear can be kept low.

Instead of sliding bearing elements, as described in the exemplary embodiment, and rolling bearings could be used, for example in the form of angular contact ball bearings. Various other modifications of the described embodiments are conceivable and possible without departing from the scope of the invention. For example, another clamping mechanism for holding the

Immersion forms 7 are used under clamping their bottom 7a. A trained in accordance with the invention holder can also be designed to hold other types of diving forms, which may for example also consist of plastic. Thus, the dipping form, for example, from the holder have einklemmbare locking lugs on the outside.

Legend

to the reference numbers: conveyor chain 15 bearing element holder 16 bearing element support shaft 17 nut

Journal 18 clip

Support arm 19 Übermuttera Bushing section 20 Pressing unit

Rotary axis 20a support surface dip mold 20b base part

a bottom 20c cover disc opening 20d centering connection connecting unit 20e pressing surface fitting 21 spring

a Supporting plate 22 Supporting part clamp 22a Counter locking element0 Circlip 22b Counter locking element 1 Axle pin 22c recess

1 a threaded section 22d stop bar1 b threaded section 22e stop bar2 nut

3 clip

4 holding unit

4a passage opening

4b shaft

4c clamping projection

4d clamping projection

4e locking element

4f locking element

4g cams

Claims

claims

1. Holder for a T also form (7), comprising a holding unit (14) with at least one clamping projection (14 c, 14 d), with respect to the holding unit (14) displaceable, by a spring (21) acted upon Andrückeinheit (20), wherein a Section of the dipping mold (7) between the at least one

Clamping projection (14c, 14d) of the holding unit (14) and a pressing surface (20e) of the pressing unit (20) can be clamped, and a connecting unit (8) for connecting the holder to a support arm carrying the holder (5), wherein the connecting unit (8 ) has an axle pin (1 1), characterized

characterized in that the axle pin (1 1) passes through an axial passage opening of the holding unit (14), wherein the holding unit (14) on the axle pin (1 1) is rotatably mounted about a rotation axis (6).

2. Holder according to claim 1, characterized in that at the two axial ends of the holding unit (14) bearing elements (15, 16) for rotatably supporting the holding unit (14) on the axle pin (11) are provided.

3. Holder according to claim 2, characterized in that the bearing elements (15, 16) form a thrust bearing for the axial mounting of the pivot pin (1 1) rotatably mounted unit.

4. Holder according to claim 2 or 3, characterized in that the

Bearing elements (15, 16) are plain bearing sleeves, which in a respective

End portion of the passage opening through the holding unit (14) are inserted.

5. Holder according to one of claims 1 to 4, characterized in that the Andrückeinheit (20) slidably mounted on a parallel to the axis of rotation (6) extending shank (14b) of the holding unit (14).

6. Holder according to claim 5, characterized in that the spring (21) is a on the shaft (14 b) arranged coil spring, on the one hand on the

Pressing unit (20) and on the other hand on one on the shaft (14b)

arranged supporting part (22) is supported.

7. Holder according to claim 6, characterized in that the support part (22) by a plug-in rotary movement on the shaft (14 b) can be fastened, wherein

Locking elements (14e, 14f) of the shaft (14b) engage with counter-locking elements (22a, 22b) of the support part (22).

8. Holder according to one of claims 1 to 7, characterized in that the axle pin (1 1) consists of steel and with a plastic connector (9) of the connection unit (8) is connected, which in a socket portion (5 a) of Support arm (5) can be fastened.

9. Holder according to one of claims 1 to 8, characterized in that a front end portion of the holding unit (14), which at least one

Clamping projection (14c, 14d), through an opening (7b) in a bottom (7a) of the dip mold (7) is insertable, wherein the bottom (7a) of the dip mold (7) between the at least one clamping projection (14c, 14d) and the

Andrückfläche (20e) of the pressure unit (20) can be clamped.

10. Carrying device for a dip mold (7) with a support shaft (3) for attachment to a conveyor chain (1), at least one with the support shaft (3)

pivotally connected support arm (5), of which a holder (2) is carried according to one of claims 1 to 9.