CA3054416A1 - Removal element - Google Patents
Removal element Download PDFInfo
- Publication number
- CA3054416A1 CA3054416A1 CA3054416A CA3054416A CA3054416A1 CA 3054416 A1 CA3054416 A1 CA 3054416A1 CA 3054416 A CA3054416 A CA 3054416A CA 3054416 A CA3054416 A CA 3054416A CA 3054416 A1 CA3054416 A1 CA 3054416A1
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- Canada
- Prior art keywords
- valve
- plate
- runner
- post
- moulded article
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/42—Removing or ejecting moulded articles using means movable from outside the mould between mould parts, e.g. robots
- B29C45/4225—Take-off members or carriers for the moulded articles, e.g. grippers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/7207—Heating or cooling of the moulded articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/7207—Heating or cooling of the moulded articles
- B29C2045/7214—Preform carriers for cooling preforms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/25—Solid
- B29K2105/253—Preform
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Robotics (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention relates to a removal element for the removal of a hollow moulded article from an injection-moulding tool, wherein the removal element has a base part and a plate, which can be moved relative to the base part between an advanced position and a retracted position, wherein a fluid runner with a runner inlet and a runner outlet is provided, wherein runner inlet and runner outlet are arranged in such a way that, when the plate is in the retracted position, the runner outlet to the moulded article interior opens, with the result that, when the runner inlet is connected to a vacuum source, fluid can be suctioned out of the interior of the moulded article via the fluid runner, wherein a valve element with a valve passage is arranged between runner inlet and runner outlet, wherein, in a first valve position, the cross section of the valve passage is larger than in a second valve position. In order to provide an improved removal element it is proposed according to the invention that the valve passage is open in the advanced position and in the retracted position of the plate, wherein the dimensions of the valve element are such that in the advanced position, when the fluid pressure at the runner inlet is lower than at the runner outlet, the valve element moves into the second valve position, whereas in the retracted position the valve element is always in the first valve position.
Description
REMOVAL ELEMENT
The present invention relates to a removal element for the removal of a hollow moulded article from an injection-moulding tool. The hollow moulded article has a moulded article interior and a moulded article opening, which is bordered by a moulded article rim.
Furthermore, the present invention relates to a post-treatment plate as well as a post-treatment system with such a removal element.
Injection moulding is one of the most important processes for the production of mouldings and moulded articles. Here, the moulding material generally present originally as a powder or granulate is heated, plasticized and pressed into a corresponding mould under high pressure. The moulding material solidifies in the mould and is then removed from the opened mould as a moulded article.
An example of a moulding is a hollow preform for the production of PET
bottles. The present invention is explained using the example of such a hollow preform. However, it can in principle also be used with other moulded articles.
PET bottles customary in the trade are generally produced by stretch blow moulding a hollow preform. The hollow preform is created in a first step by means of injection moulding. The stretch blow moulding following the injection moulding procedure can be effected either immediately after production of the hollow preform or at a later point in time.
A lot of effort is required in the production of the corresponding injection moulds since on the one .. hand the injection mould must be designed for very high pressures and on the other hand must also have correspondingly heated and/or cooled runners.
An injection-moulding tool for the production of PET preforms usually consists of a plurality of cavities, e.g. 96, into which correspondingly formed mould cores can be introduced. When the mould is closed, i.e. when the core is inserted into the corresponding cavity, a space is formed between the core on the one hand and the cavity on the other hand, the so-called mould cavity.
The plasticized plastic, e.g. PET, is then injected into this space under high pressure. As soon as the PET preform has cooled sufficiently, the mould can be opened and the preform removed.
In order to reduce the cycle times, i.e. the time between one injection moulding procedure and the next injection moulding procedure, it is already usual to remove the preform from the mould at a very early point in time at which the outer surfaces of the preform are already solid but its interior is still fluid. In this state, the preform is generally transferred to a so-called receiving plate, which
The present invention relates to a removal element for the removal of a hollow moulded article from an injection-moulding tool. The hollow moulded article has a moulded article interior and a moulded article opening, which is bordered by a moulded article rim.
Furthermore, the present invention relates to a post-treatment plate as well as a post-treatment system with such a removal element.
Injection moulding is one of the most important processes for the production of mouldings and moulded articles. Here, the moulding material generally present originally as a powder or granulate is heated, plasticized and pressed into a corresponding mould under high pressure. The moulding material solidifies in the mould and is then removed from the opened mould as a moulded article.
An example of a moulding is a hollow preform for the production of PET
bottles. The present invention is explained using the example of such a hollow preform. However, it can in principle also be used with other moulded articles.
PET bottles customary in the trade are generally produced by stretch blow moulding a hollow preform. The hollow preform is created in a first step by means of injection moulding. The stretch blow moulding following the injection moulding procedure can be effected either immediately after production of the hollow preform or at a later point in time.
A lot of effort is required in the production of the corresponding injection moulds since on the one .. hand the injection mould must be designed for very high pressures and on the other hand must also have correspondingly heated and/or cooled runners.
An injection-moulding tool for the production of PET preforms usually consists of a plurality of cavities, e.g. 96, into which correspondingly formed mould cores can be introduced. When the mould is closed, i.e. when the core is inserted into the corresponding cavity, a space is formed between the core on the one hand and the cavity on the other hand, the so-called mould cavity.
The plasticized plastic, e.g. PET, is then injected into this space under high pressure. As soon as the PET preform has cooled sufficiently, the mould can be opened and the preform removed.
In order to reduce the cycle times, i.e. the time between one injection moulding procedure and the next injection moulding procedure, it is already usual to remove the preform from the mould at a very early point in time at which the outer surfaces of the preform are already solid but its interior is still fluid. In this state, the preform is generally transferred to a so-called receiving plate, which
- 2 -consists of a group of receiving cavities. Thus, it is usual, for example in the case of the so-called vertical tools, i.e. those injection-moulding tools which open by a vertical movement of one tool part with respect to the other, to open the tool mould already after e.g. ten seconds, to move a receiving plate with corresponding receiving cavities into the mould, to allow the individual preforms to fall into the receiving cavities by means of gravity, to remove the receiving plate with the preforms from the tool, to close the mould again and to begin the next injection moulding procedure. During the next injection moulding procedure, the previous preforms remain in the receiving cavity, which is usually cooled. Embodiments are also known in which the individual preforms are removed from the mould by means of a gripper unit and transferred into the receiving plate arranged outside the tool mould.
Since the preform has to stay in the receiving cavity of the state of the art for a relatively long time to cool down, with the result that as a rule the next preform can already be removed from the injection-moulding tool before the preform in the receiving cavity has cooled down enough to be removed without the risk of damage, it is already usual to use receiving plates which have several groups of receiving cavities, wherein each group has as many receiving cavities as there are preforms provided in each injection moulding cycle by the injection-moulding tool. The individual groups of receiving cavities are then loaded with preforms one after the other, with the result that the individual preform can remain in the receiving cavity longer than one injection moulding cycle.
In order to further shorten the cycle time, in recent years a number of efforts have been made to remove the preform from the injection mould already at a very early point in time. Since the preform is still relatively soft at such an early point in time, higher demands are placed on the post-treatment. Thus, it has already been proposed to additionally cool or post-treat the preform held in the receiving cavity with a post-treatment pin which is introduced into the preform. The preform is thus cooled not only from outside via the cooled receiving cavity, but also from inside via the post-treatment pins. As a rule, the post-treatment pins are arranged on a post-treatment plate which can be displaced relative to the receiving plate with the receiving cavities, wherein in one position the post-treatment pins are arranged inside the preforms, whereas in the other position this is not the case.
Since several groups of receiving cavities are located in the receiving plate, the post-treatment plate as a rule also has the removal elements named at the beginning, wherein the moulded articles are removed from a group of receiving cavities with the aid of the removal elements, while the post-treatment pins post-treat the preform in the other groups of receiving cavities. The moulded articles which have been held longest in the receiving cavities are thus always removed from the group of receiving cavities using the removal elements. Cooling from inside is thus effected exclusively via the post-treatment pins, i.e. there is no post-treatment from inside during
Since the preform has to stay in the receiving cavity of the state of the art for a relatively long time to cool down, with the result that as a rule the next preform can already be removed from the injection-moulding tool before the preform in the receiving cavity has cooled down enough to be removed without the risk of damage, it is already usual to use receiving plates which have several groups of receiving cavities, wherein each group has as many receiving cavities as there are preforms provided in each injection moulding cycle by the injection-moulding tool. The individual groups of receiving cavities are then loaded with preforms one after the other, with the result that the individual preform can remain in the receiving cavity longer than one injection moulding cycle.
In order to further shorten the cycle time, in recent years a number of efforts have been made to remove the preform from the injection mould already at a very early point in time. Since the preform is still relatively soft at such an early point in time, higher demands are placed on the post-treatment. Thus, it has already been proposed to additionally cool or post-treat the preform held in the receiving cavity with a post-treatment pin which is introduced into the preform. The preform is thus cooled not only from outside via the cooled receiving cavity, but also from inside via the post-treatment pins. As a rule, the post-treatment pins are arranged on a post-treatment plate which can be displaced relative to the receiving plate with the receiving cavities, wherein in one position the post-treatment pins are arranged inside the preforms, whereas in the other position this is not the case.
Since several groups of receiving cavities are located in the receiving plate, the post-treatment plate as a rule also has the removal elements named at the beginning, wherein the moulded articles are removed from a group of receiving cavities with the aid of the removal elements, while the post-treatment pins post-treat the preform in the other groups of receiving cavities. The moulded articles which have been held longest in the receiving cavities are thus always removed from the group of receiving cavities using the removal elements. Cooling from inside is thus effected exclusively via the post-treatment pins, i.e. there is no post-treatment from inside during
- 3 -the removal procedure. In the process, either fluid, e.g. cool air, can be supplied via the removal pins so that warm air is thereby displaced from the hollow moulding and replaced by the cooler air, or fluid, e.g. warm air, is suctioned out of the hollow moulding through the removal pins so that cooler air from the surrounding area flows in. In both cases a more effective cooling of the hollow moulding from inside is effected.
The removal is often vacuum-assisted. This means that the removal element has a base part and a plate, which is movable relative to the base part between an advanced position and a retracted position. A spring element is provided, with which the plate is pushed into its advanced position, wherein the plate is provided to come into contact with the rim of the moulded article in such a way that it seals the opening of the moulded article and, through the contact with the opening of the moulded article, is moved from the advanced position into the retracted position. The removal element has in addition a fluid runner with a runner inlet and a runner outlet, which are arranged in such a way that, when the plate is in the retracted position, the runner outlet to the moulded article interior opens, with the result that, when the runner inlet is connected to a vacuum source, fluid can be suctioned out of the interior of the moulded article via the fluid runner. Since the plate seals the hollow moulded article, a vacuum thus forms inside the hollow body and the hollow moulded article is pulled onto the plate and can be moved together with it away from the receiving cavity in order to remove the hollow moulded article from the injection-moulding tool.
By an injection-moulding tool are meant all parts of the injection-moulding tool, that is not only the cavity forming the mould cavity but also the downstream receiving cavity in which the post-treatment of the hollow moulded article takes place.
However, it can now be the case that no moulded article at all is contained in the receiving cavity because, for example, the corresponding cavity forming the mould cavity is damaged. The consequence of this is, however, that when the runner inlet is connected to a vacuum, no negative pressure forms in a moulded article and instead ambient air is sucked unhindered into the runner outlet. Since, as a rule, a plurality of receiving cavities are arranged next to each other and therefore a plurality of removal elements are also connected to a common vacuum connection, this in turn means that the negative pressure at the removal elements which are arranged next to the removal element which is not sealed by a hollow moulded article is not sufficient to remove the moulded article from the receiving cavity.
It has therefore already been proposed to arrange, between runner inlet and runner outlet, a valve element with a valve passage, which is normally closed and is only opened when a moulded article is detected by a movement of the plate.
The removal is often vacuum-assisted. This means that the removal element has a base part and a plate, which is movable relative to the base part between an advanced position and a retracted position. A spring element is provided, with which the plate is pushed into its advanced position, wherein the plate is provided to come into contact with the rim of the moulded article in such a way that it seals the opening of the moulded article and, through the contact with the opening of the moulded article, is moved from the advanced position into the retracted position. The removal element has in addition a fluid runner with a runner inlet and a runner outlet, which are arranged in such a way that, when the plate is in the retracted position, the runner outlet to the moulded article interior opens, with the result that, when the runner inlet is connected to a vacuum source, fluid can be suctioned out of the interior of the moulded article via the fluid runner. Since the plate seals the hollow moulded article, a vacuum thus forms inside the hollow body and the hollow moulded article is pulled onto the plate and can be moved together with it away from the receiving cavity in order to remove the hollow moulded article from the injection-moulding tool.
By an injection-moulding tool are meant all parts of the injection-moulding tool, that is not only the cavity forming the mould cavity but also the downstream receiving cavity in which the post-treatment of the hollow moulded article takes place.
However, it can now be the case that no moulded article at all is contained in the receiving cavity because, for example, the corresponding cavity forming the mould cavity is damaged. The consequence of this is, however, that when the runner inlet is connected to a vacuum, no negative pressure forms in a moulded article and instead ambient air is sucked unhindered into the runner outlet. Since, as a rule, a plurality of receiving cavities are arranged next to each other and therefore a plurality of removal elements are also connected to a common vacuum connection, this in turn means that the negative pressure at the removal elements which are arranged next to the removal element which is not sealed by a hollow moulded article is not sufficient to remove the moulded article from the receiving cavity.
It has therefore already been proposed to arrange, between runner inlet and runner outlet, a valve element with a valve passage, which is normally closed and is only opened when a moulded article is detected by a movement of the plate.
- 4 -To reduce the cycle time further it would be desirable if a more effective post-treatment were to be effected.
Starting from the state of the art described, the object of the present invention is therefore to .. provide a removal element which allows a more efficient post-treatment of moulded articles and, at the same time, ensures that the fluid flow through the fluid runner is limited when no hollow moulded article is ready for removal.
This object is achieved according to the invention in that the valve passage is open in the advanced position and in the retracted position of the plate, wherein the dimensions of the valve element are such that, in the advanced position when the fluid pressure at the runner inlet is lower than at the runner outlet, the valve element moves into the second valve position, whereas in the retracted position, the valve element is always in the first valve position.
In the simplest case, the valve passage is closed in the second valve position. Therefore, in the following description it is assumed that the valve passage is closed in the second valve position.
In principle, however, it would also be possible only to significantly restrict the valve passage in the second valve position as even then the negative effects on adjacent removal elements are reduced in the case where no hollow moulded article is present.
The opening of the valve passage in the retracted position of the plate is necessary in order to apply a vacuum over the fluid runner in order to be able to remove the moulded article. Because it is provided according to the invention that the valve passage is also open in the advanced position so that fluid can be supplied or discharged via the fluid runner, a post-treatment can also be effected from inside via the removal element. In the case of a three-stage removal plate, i.e. a plate which has three times as many receiving cavities as moulded article-forming cavities, the post-treatment time for the post-treatment of the interior of the hollow moulding is thereby increased by almost 50%.
In a particularly preferred embodiment, it is provided that the plate can be moved back and forth between the advanced position, the retracted position and a sealing position, wherein in the sealing position of the plate the valve element is in the second valve position. In this embodiment, the plate has three positions in total, namely the advanced position, the retracted position and a sealing position. Only in the sealing position is the valve element closed or the valve passage greatly restricted. In contrast, the valve passage is open both in the advanced position and in the retracted position.
Starting from the state of the art described, the object of the present invention is therefore to .. provide a removal element which allows a more efficient post-treatment of moulded articles and, at the same time, ensures that the fluid flow through the fluid runner is limited when no hollow moulded article is ready for removal.
This object is achieved according to the invention in that the valve passage is open in the advanced position and in the retracted position of the plate, wherein the dimensions of the valve element are such that, in the advanced position when the fluid pressure at the runner inlet is lower than at the runner outlet, the valve element moves into the second valve position, whereas in the retracted position, the valve element is always in the first valve position.
In the simplest case, the valve passage is closed in the second valve position. Therefore, in the following description it is assumed that the valve passage is closed in the second valve position.
In principle, however, it would also be possible only to significantly restrict the valve passage in the second valve position as even then the negative effects on adjacent removal elements are reduced in the case where no hollow moulded article is present.
The opening of the valve passage in the retracted position of the plate is necessary in order to apply a vacuum over the fluid runner in order to be able to remove the moulded article. Because it is provided according to the invention that the valve passage is also open in the advanced position so that fluid can be supplied or discharged via the fluid runner, a post-treatment can also be effected from inside via the removal element. In the case of a three-stage removal plate, i.e. a plate which has three times as many receiving cavities as moulded article-forming cavities, the post-treatment time for the post-treatment of the interior of the hollow moulding is thereby increased by almost 50%.
In a particularly preferred embodiment, it is provided that the plate can be moved back and forth between the advanced position, the retracted position and a sealing position, wherein in the sealing position of the plate the valve element is in the second valve position. In this embodiment, the plate has three positions in total, namely the advanced position, the retracted position and a sealing position. Only in the sealing position is the valve element closed or the valve passage greatly restricted. In contrast, the valve passage is open both in the advanced position and in the retracted position.
- 5 -For example, the sealing position can be arranged between the advanced position and the retracted position. This means that, when a vacuum is applied at the runner inlet, the plate moves from the advanced position in the direction of the retracted position into the sealing position. This can be realized, for example, by corresponding control surfaces which are exposed to pressure.
However, it is not necessary for the sealing position to be arranged between the advanced position and the retracted position. The sealing position can thus also be arranged further away from the retracted position than the advanced position.
In a further preferred embodiment, in a third valve position the cross section of the valve passage is smaller than in the first valve position and larger than in the second valve position, wherein in the advanced position of the plate, the valve element is in the third valve position when the fluid pressure at the runner inlet is greater than or equal to the fluid pressure at the runner outlet. As a rule, a smaller cross section of the valve passage is necessary for the supply of a cooling fluid than is necessary for a rapid evacuation of the hollow moulding. Therefore, in this embodiment, the cross section of the valve passage is smaller in the third valve position than in the first valve position.
In a further preferred embodiment it is provided that the valve element has a non-return valve and a check valve, wherein the non-return valve and the check valve are arranged parallel to each .. other, such that in the retracted position of the plate the check valve is open and in the advanced position of the plate the check valve is closed. The non-return valve can be arranged in such a way that it closes when the fluid pressure at the runner inlet is lower than at the runner outlet.
Cooling fluid can thus be supplied to the hollow moulding via the non-return valve. If the runner inlet is connected to a vacuum, the non-return valve thus closes. Only when the check valve is then opened, i.e. the plate is in its retracted position, can the hollow moulding be evacuated via the check valve. In this embodiment, both the supply of cooling fluid and the evacuation is effected via the same fluid runner.
Furthermore, the present invention relates to a post-treatment plate with at least one removal element as described above, wherein the base part of the removal element is connected to the post-treatment plate in such a way that, using the post-treatment plate, fluid can be supplied to or suctioned from the fluid runner via the runner inlet.
Furthermore, the present invention relates to a system for the further treatment of hollow mouldings produced by means of injection moulding having i.) a receiving plate which has at least one receiving cavity for receiving a moulding,
However, it is not necessary for the sealing position to be arranged between the advanced position and the retracted position. The sealing position can thus also be arranged further away from the retracted position than the advanced position.
In a further preferred embodiment, in a third valve position the cross section of the valve passage is smaller than in the first valve position and larger than in the second valve position, wherein in the advanced position of the plate, the valve element is in the third valve position when the fluid pressure at the runner inlet is greater than or equal to the fluid pressure at the runner outlet. As a rule, a smaller cross section of the valve passage is necessary for the supply of a cooling fluid than is necessary for a rapid evacuation of the hollow moulding. Therefore, in this embodiment, the cross section of the valve passage is smaller in the third valve position than in the first valve position.
In a further preferred embodiment it is provided that the valve element has a non-return valve and a check valve, wherein the non-return valve and the check valve are arranged parallel to each .. other, such that in the retracted position of the plate the check valve is open and in the advanced position of the plate the check valve is closed. The non-return valve can be arranged in such a way that it closes when the fluid pressure at the runner inlet is lower than at the runner outlet.
Cooling fluid can thus be supplied to the hollow moulding via the non-return valve. If the runner inlet is connected to a vacuum, the non-return valve thus closes. Only when the check valve is then opened, i.e. the plate is in its retracted position, can the hollow moulding be evacuated via the check valve. In this embodiment, both the supply of cooling fluid and the evacuation is effected via the same fluid runner.
Furthermore, the present invention relates to a post-treatment plate with at least one removal element as described above, wherein the base part of the removal element is connected to the post-treatment plate in such a way that, using the post-treatment plate, fluid can be supplied to or suctioned from the fluid runner via the runner inlet.
Furthermore, the present invention relates to a system for the further treatment of hollow mouldings produced by means of injection moulding having i.) a receiving plate which has at least one receiving cavity for receiving a moulding,
- 6 -ii.) a post-treatment system with a post-treatment plate as described, iii.) a moving device with which the receiving plate can be moved back and forth relative to the post-treatment plate between a rear position and a forward position, wherein the distance between the receiving plate and the post-treatment plate in the forward position is smaller than in the rear position.
For the post-treatment or removal of the hollow mouldings, the receiving plate is thus brought into the forward position with the aid of the moving device. In this position, the removal element is in contact with the hollow moulded article with the result that the plate is moved into the retracted position and the hollow moulding can be evacuated using the removal element.
Then, the receiving plate can be brought into the rear position with the result that the hollow moulding is removed from the receiving cavity. It is both possible to move the post-treatment plate relative to a stationary receiving plate and possible to move the receiving plate relative to a stationary post-treatment plate.
In a preferred embodiment, the post-treatment plate can have at least one post-treatment pin with a fluid runner, through which fluid can be introduced into or suctioned from the interior of a moulding received in the receiving cavity, wherein in the forward position the post-treatment pin is positioned inside the receiving cavity and in the rear position the post-treatment pin is not positioned inside the receiving cavity. Essentially, post-treatment pin and removal element can be constructed similarly, with the difference that the post-treatment pin does not have a valve element or a moving plate.
In a further preferred embodiment it is provided that, in the forward position, either the plate abuts on a hollow moulded article received in the receiving cavity and the valve is in the first valve position or, if no hollow moulded article is positioned in the receiving cavity, it abuts on the receiving cavity and the valve is in the second valve position.
Further advantages, features and possible applications become clear from the following description of preferred embodiments and the associated figures. There are shown in:
Figure 1 a section view and a side view of a first embodiment of a removal element according to the invention, Figure 2 a side view and a section view of a second embodiment of a removal element according to the invention and Figure 3 a section view of a third embodiment of a removal element according to the invention.
For the post-treatment or removal of the hollow mouldings, the receiving plate is thus brought into the forward position with the aid of the moving device. In this position, the removal element is in contact with the hollow moulded article with the result that the plate is moved into the retracted position and the hollow moulding can be evacuated using the removal element.
Then, the receiving plate can be brought into the rear position with the result that the hollow moulding is removed from the receiving cavity. It is both possible to move the post-treatment plate relative to a stationary receiving plate and possible to move the receiving plate relative to a stationary post-treatment plate.
In a preferred embodiment, the post-treatment plate can have at least one post-treatment pin with a fluid runner, through which fluid can be introduced into or suctioned from the interior of a moulding received in the receiving cavity, wherein in the forward position the post-treatment pin is positioned inside the receiving cavity and in the rear position the post-treatment pin is not positioned inside the receiving cavity. Essentially, post-treatment pin and removal element can be constructed similarly, with the difference that the post-treatment pin does not have a valve element or a moving plate.
In a further preferred embodiment it is provided that, in the forward position, either the plate abuts on a hollow moulded article received in the receiving cavity and the valve is in the first valve position or, if no hollow moulded article is positioned in the receiving cavity, it abuts on the receiving cavity and the valve is in the second valve position.
Further advantages, features and possible applications become clear from the following description of preferred embodiments and the associated figures. There are shown in:
Figure 1 a section view and a side view of a first embodiment of a removal element according to the invention, Figure 2 a side view and a section view of a second embodiment of a removal element according to the invention and Figure 3 a section view of a third embodiment of a removal element according to the invention.
- 7 -In Figure 1, a side view (right) and a section view (left) of a first embodiment of a removal element 1 according to the invention are shown. The removal element 1 has a base part 2 as well as a plate 3, which can be moved relative to the base part 2 between an advanced position, which is shown in Figure 1, and a retracted position, which is not shown. The plate 3 is pushed into the advanced position with the aid of the spring element 4. The base part 2 has a connection 5, with which the base part 2 can be connected to a post-treatment plate (not shown).
The removal element 1 has a fluid runner with a runner inlet 6 and a runner outlet 7. In the situation shown in Figure 1, cooling fluid, which can escape via the various openings of the runner outlet 7, can be supplied via the runner inlet 6. If a hollow moulding is positioned on the plate 3 or if the removal element is immersed in a corresponding hollow moulded article, a cooling fluid can thus be introduced into the hollow moulded article. The base part 2 has a sheath-shaped section with a cone-shaped lateral surface 10. Within the sheath-shaped section, a valve body
The removal element 1 has a fluid runner with a runner inlet 6 and a runner outlet 7. In the situation shown in Figure 1, cooling fluid, which can escape via the various openings of the runner outlet 7, can be supplied via the runner inlet 6. If a hollow moulding is positioned on the plate 3 or if the removal element is immersed in a corresponding hollow moulded article, a cooling fluid can thus be introduced into the hollow moulded article. The base part 2 has a sheath-shaped section with a cone-shaped lateral surface 10. Within the sheath-shaped section, a valve body
8 is provided, which accordingly has corresponding cone-shaped outer surfaces 9. If a vacuum is now applied at the runner inlet 6 and if no hollow moulding is arranged on the plate 3, a large difference in pressure results between runner inlet 6 and runner outlet 7. This difference in pressure ensures that the valve element 8 is moved downwards in Figure 1 until the corresponding conical surfaces 9 and 10 lie on top of each other. The plate 3 is thereby likewise moved slightly downwards, namely into its sealing position. In the sealing position, the valve passage through the fluid runner is closed.
Furthermore, a bore 11 is provided in the base part 2, which produces a connection to the fluid runner. The bore 11 is sealed both in the sealing position and in the advanced position. If a hollow moulded article now rests on the plate 3, it pushes the plate 3 downwards, i.e. into its retracted position, whereby the valve passage is opened again via the bore 11 and a vacuum can be applied to the hollow moulding.
In Figure 2 an alternative embodiment of the removal element 21 according to the invention is shown. The removal element 21 likewise has a base part 22. Here too, a plate 23 is provided, which is movable relative to the base part 22 and is pushed into its advanced position, which is represented in Figure 2, with the aid of the spring element 24. In this position, a fluid runner with a runner inlet 26 and a runner outlet 27 is unsealed, this means that fluid can be supplied or discharged via the fluid runner.
If the removal element, which generally is mounted on a corresponding post-treatment plate, is now moved relative to the receiving cavity, in which a hollow moulding is arranged as a rule, the plate 23 will come into contact with the opening of the hollow moulding and the plate 23 will push downwards against the force of the spring element 24, with the result that the runner outlet 27 is initially sealed. However, in this embodiment the plate 23 is pushed so far downwards that the opening of the runner outlet 27 is opened again since the plate 23 is located closer to the base part 22 than to the runner outlet 27. In this position, the hollow moulding can thus be evacuated.
If no hollow moulding is present in the receiving cavity, the plate 23 will abut only on the rim of the receiving cavity and will therefore not be pushed so far downwards as is the case when a hollow moulding is present. The size of the distances is such that, in this case, the plate 23 is only pushed so far downwards that the runner outlet 27 is sealed.
Finally, in Figure 3 a third embodiment is represented. Here too the removal element 31 consists of a base part 32 and a plate 33, which can be moved relative to each other.
With the aid of the spring element 34, the plate 33 is pre-loaded into the advanced position, which is shown in Figure 3. Here too a fluid runner with a runner inlet 36 is provided. The runner outlet branches and has two openings 37' and 37". In the position represented, the opening 37" is sealed. With the aid of a hollow moulded article, the plate 33 can be moved downwards and the opening 37" can be opened. The opening 37", which is sealed or uncovered by the plate 33, thus represents a check valve.
Parallel thereto, a non-return valve is provided which has a valve ball 38 which is pushed into the position represented by means of the spring 39. In this position, cooling fluid can thus be supplied via the fluid runner and the runner outlet 37'. If a vacuum is now applied at the runner inlet 36 this will lead to the ball 38 moving downwards against the spring force 39 due to the difference in pressure and obstructing the runner outlet 37'. If no hollow moulded article is present, the runner is thus blocked. However, if a hollow moulded article is present, the plate 33 is pushed downwards in such a way that the runner outlet 37" is uncovered and the hollow moulding can be evacuated via the fluid runner.
Furthermore, a bore 11 is provided in the base part 2, which produces a connection to the fluid runner. The bore 11 is sealed both in the sealing position and in the advanced position. If a hollow moulded article now rests on the plate 3, it pushes the plate 3 downwards, i.e. into its retracted position, whereby the valve passage is opened again via the bore 11 and a vacuum can be applied to the hollow moulding.
In Figure 2 an alternative embodiment of the removal element 21 according to the invention is shown. The removal element 21 likewise has a base part 22. Here too, a plate 23 is provided, which is movable relative to the base part 22 and is pushed into its advanced position, which is represented in Figure 2, with the aid of the spring element 24. In this position, a fluid runner with a runner inlet 26 and a runner outlet 27 is unsealed, this means that fluid can be supplied or discharged via the fluid runner.
If the removal element, which generally is mounted on a corresponding post-treatment plate, is now moved relative to the receiving cavity, in which a hollow moulding is arranged as a rule, the plate 23 will come into contact with the opening of the hollow moulding and the plate 23 will push downwards against the force of the spring element 24, with the result that the runner outlet 27 is initially sealed. However, in this embodiment the plate 23 is pushed so far downwards that the opening of the runner outlet 27 is opened again since the plate 23 is located closer to the base part 22 than to the runner outlet 27. In this position, the hollow moulding can thus be evacuated.
If no hollow moulding is present in the receiving cavity, the plate 23 will abut only on the rim of the receiving cavity and will therefore not be pushed so far downwards as is the case when a hollow moulding is present. The size of the distances is such that, in this case, the plate 23 is only pushed so far downwards that the runner outlet 27 is sealed.
Finally, in Figure 3 a third embodiment is represented. Here too the removal element 31 consists of a base part 32 and a plate 33, which can be moved relative to each other.
With the aid of the spring element 34, the plate 33 is pre-loaded into the advanced position, which is shown in Figure 3. Here too a fluid runner with a runner inlet 36 is provided. The runner outlet branches and has two openings 37' and 37". In the position represented, the opening 37" is sealed. With the aid of a hollow moulded article, the plate 33 can be moved downwards and the opening 37" can be opened. The opening 37", which is sealed or uncovered by the plate 33, thus represents a check valve.
Parallel thereto, a non-return valve is provided which has a valve ball 38 which is pushed into the position represented by means of the spring 39. In this position, cooling fluid can thus be supplied via the fluid runner and the runner outlet 37'. If a vacuum is now applied at the runner inlet 36 this will lead to the ball 38 moving downwards against the spring force 39 due to the difference in pressure and obstructing the runner outlet 37'. If no hollow moulded article is present, the runner is thus blocked. However, if a hollow moulded article is present, the plate 33 is pushed downwards in such a way that the runner outlet 37" is uncovered and the hollow moulding can be evacuated via the fluid runner.
- 9 -List of reference numbers 1, 21, 31 removal element 2, 22, 32 base part 3, 23, 33 plate 4, 24, 34 spring element 5 connection 6, 26, 36 runner inlet 7, 27, 37 runner outlet 8 valve element 9 outer surfaces
10 lateral surface
11 bore 37, 37" openings 38 ball 39 spring
Claims (11)
1. Removal element for the removal from an injection-moulding tool of a hollow moulded article having a moulded article interior and a moulded article opening, which is bordered by a moulded article rim, wherein the removal element has a base part and a plate, which can be moved relative to the base part between an advanced position and a retracted position, wherein a spring element is provided with which the plate is pushed into its advanced position, wherein the plate is provided to come into contact with the rim of the moulded article in such a way that it seals the opening of the moulded article and, through the contact with the rim of the moulded article, is moved from the advanced position into the retracted position, wherein a fluid runner with a runner inlet and a runner outlet is provided, wherein runner inlet and runner outlet are arranged in such a way that, when the plate is in the retracted position, the runner outlet to the moulded article interior opens, with the result that, when the runner inlet is connected to a vacuum source, fluid can be suctioned out of the interior of the moulded article via the fluid runner, wherein a valve element with a valve passage is arranged between runner inlet and runner outlet, wherein, in a first valve position, the cross section of the valve passage is larger than in a second valve position, characterized in that the valve passage is open in the advanced position and in the retracted position of the plate, wherein the dimensions of the valve element are such that in the advanced position, when the fluid pressure at the runner inlet is lower than at the runner outlet, the valve element moves into the second valve position, whereas in the retracted position the valve element is always in the first valve position.
2. Removal element according to claim 1, characterized in that, in the second valve position, the valve passage is closed.
3. Removal element according to claim 1 or 2, characterized in that the plate can be moved back and forth between the advanced position, the retracted position and a sealing position, wherein in the sealing position of the plate the valve element is in the second valve position.
4. Removal element according to one of claims 1-3, characterized in that, in a third valve position, the cross section of the valve passage is smaller than in the first valve position and larger than in the second valve position, wherein, in the advanced position of the plate, the valve element is in the third valve position when the fluid pressure at the runner inlet is greater than or equal to the fluid pressure at the runner outlet.
5. Removal element according to claim 3 or 4, characterized in that the sealing position is arranged between the advanced position and the retracted position.
6. Removal element according to one of claims 1-5, characterized in that the valve element has a non-return valve and a check valve, wherein the non-return valve and the check valve are arranged parallel to each other, wherein in the retracted position of the plate the check valve is open and in the advanced position of the plate the check valve is closed.
7. Removal element according to claim 6, characterized in that the non-return valve is arranged in such a way that it closes when the fluid pressure at the runner inlet is lower than at the runner outlet.
8. Post-treatment plate with at least one removal element according to one of claims 1 to 7, characterized in that the base part of the removal element is connected to the post-treatment plate in such a way that, using the post-treatment plate, fluid can be supplied to or suctioned from the fluid runner via the runner inlet.
9. System for the further treatment of hollow preforms produced by means of injection moulding having i) a receiving plate which has at least one receiving cavity for receiving a moulding, ii) a post-treatment system with a post-treatment plate according to claim 8, iii) a moving device with which the receiving plate can be moved back and forth relative to the post-treatment plate between a rear position and a forward position, wherein the distance between the receiving plate and the post-treatment plate in the forward position is smaller than in the rear position.
10. System according to claim 9, characterized in that the post-treatment plate has at least one post-treatment pin with a fluid runner through which fluid can be introduced into or suctioned from the interior of a moulding received in the receiving cavity, wherein in the forward position the post-treatment pin is positioned inside the receiving cavity and in the rear position the post-treatment pin is not positioned inside the receiving cavity.
11. System according to claim 9 or 10, characterized in that in the forward position either the plate abuts on a hollow moulded article received in the receiving cavity and the valve is in the first valve position or, if no hollow moulded article is positioned in the receiving cavity, it abuts on the receiving cavity and the valve is in the second valve position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018121878.8A DE102018121878A1 (en) | 2018-09-07 | 2018-09-07 | Removal element |
| DE102018121878.8 | 2018-09-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA3054416A1 true CA3054416A1 (en) | 2020-03-07 |
Family
ID=67850945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3054416A Pending CA3054416A1 (en) | 2018-09-07 | 2019-09-05 | Removal element |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3620287B1 (en) |
| CA (1) | CA3054416A1 (en) |
| DE (1) | DE102018121878A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117921959B (en) * | 2023-12-11 | 2024-11-05 | 江苏钧骋车业有限公司 | Automobile instrument board injection molding and workpiece taking clamp |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29716911U1 (en) * | 1997-09-20 | 1997-11-13 | J. Schmalz GmbH, 72293 Glatten | Gripping device |
| US7670126B2 (en) * | 2006-05-12 | 2010-03-02 | Husky Injection Molding Systems Ltd. | Valve for controlling air flow in a molded article holder |
| US20080166209A1 (en) * | 2007-01-10 | 2008-07-10 | Husky Injection Molding Systems Ltd. | Molded Article Picker |
| WO2012003583A1 (en) * | 2010-07-05 | 2012-01-12 | Husky Injection Molding Systems Ltd. | Picking tool |
| WO2016061682A1 (en) * | 2014-10-21 | 2016-04-28 | Athena Automation Ltd. | Post-mold retaining apparatus and method |
-
2018
- 2018-09-07 DE DE102018121878.8A patent/DE102018121878A1/en active Pending
-
2019
- 2019-09-03 EP EP19195175.5A patent/EP3620287B1/en active Active
- 2019-09-05 CA CA3054416A patent/CA3054416A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102018121878A1 (en) | 2020-03-12 |
| EP3620287A2 (en) | 2020-03-11 |
| EP3620287A3 (en) | 2020-04-01 |
| EP3620287B1 (en) | 2021-04-07 |
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