Hot runner nozzles for side casting

Abstract

The present invention relates to a hot runner nozzle for lateral casting of plastic parts, the hot runner nozzle comprising a nozzle body (2) and a pressure cover (3), wherein a tip element (7) is arranged between the nozzle body (2) and the pressure cover (3), wherein the tip elements are all inserted into a recess (6) in the nozzle body (2) and are all penetrated by a movable closing needle having a tip (15), and the tip protrudes beyond the outer circumferential edge of the nozzle body at least in the operating position, wherein the closing needle (14) comprises a coupling device (14) at its end facing away from the tip (15), and the coupling device is connected to a drive device (28, 29) for moving the closing needle (14), and its uniqueness lies in that the tip element (7) is also supported on a seat element (20) on the side of each tip (15) of the closing needle (14), and the seat element is inserted between the nozzle body (2) and the pressure cover (3).

Description

Technical Field

[0001] The invention relates to a hot runner nozzle for lateral pouring. Background Art

[0002] In injection molding technology, it is often necessary to cast plastic parts laterally, i.e. vertically or obliquely with respect to the demoulding direction. For this purpose, so-called hot runner nozzles for side casting, also called side casting nozzles, are used, which comprise a nozzle body and a tip element. In order to achieve good temperature control of the melt up to the surface of the article, the nozzle tip or the tip element is to be guided up to the surface of the article. WO 2010 / 127965 A2 is cited for this technical background. Summary of the invention

[0003] Starting from this concept, the present invention is based on the object of further optimizing the structure known from WO 2010 / 127965 A2 in terms of construction in a structurally simple manner.

[0004] Advantageous embodiments of the invention can be taken from the description.

[0005] According to an embodiment of the present invention, the following subject is proposed: a hot runner nozzle for lateral casting of plastic parts, which has a nozzle body and a pressure cover, wherein a tip element is arranged between the nozzle body and the pressure cover, each of the tip elements is inserted into a recess of the nozzle body and is penetrated by a movable closing needle with a tip, each tip protruding beyond the outer circumferential edge of the nozzle body at least in the operating position, wherein the closing needles each have a coupling device on their ends facing away from the tips, and the coupling device is connected to a drive device for moving the closing needles.

[0006] It is further proposed that the tip element is also supported on its side facing away from the respective tip of the shut-off needle on an abutment element which is inserted between the nozzle body and the pressure cap.

[0007] An abutment element of this type, which can be mounted separately on the nozzle body and preferably removable, facilitates the mounting of the tip element on the one hand and also facilitates removal, for example during maintenance, on the other hand. Furthermore, the abutment element contributes in a simple manner to very good support of the respective tip element and still achieves a simple structural design, in which the end of the closure device can be well coupled to the drive device.

[0008] According to an embodiment of the present invention, it can also be proposed that the closure needle can have or approach one, two or more operating positions. and / or melt flow, the shut-off needle can preferably be moved into a corresponding particularly suitable operating position from a plurality of operating positions.

[0009] The operating position can be influenced directly or via corresponding activation or corresponding design of the drive device.

[0010] It can also be provided that the activation and / or the design is carried out in such a way that the closing needle can have different speeds during the opening or closing movement.

[0011] In particular when an electric drive is used, the respective shut-in needle can be positioned very accurately and approached at a predetermined speed or a speed profile as a function of the injection profile over the injection time. The shut-in needle can influence the melt flow rate in the melt outlet region. The shut-in needle can also protrude into the mold via a controller and can be retracted into the surface of the mold. The positioning of the different operating positions is performed by the drive of the respective shut-in needle, wherein the position of the shut-in needle is approached at a predetermined speed or a speed profile.

[0012] According to a preferred variant, the tip elements each comprise a heat-conducting body and a respective closed needle penetrating completely (eg on both sides) the heat-conducting body.

[0013] According to a further preferred variant, the tip elements also each comprise a needle seal and a guide sleeve, which the respective closure needle also penetrates completely (e.g. on both sides). The needle seal and guide sleeve ensure good sealing of the movable closure needle and good guidance towards the abutment element.

[0014] Preferably, a sealing sleeve section for supporting the tip element on a tool on a side facing away from the abutment element may be formed on the heat conducting body. The sealing sleeve section may be formed integrally with the heat conducting body or as a separate sleeve from the heat conducting body.

[0015] It can also be advantageously provided that the sealing sleeve section is made of a material having a lower thermal conductivity than the heat conducting body, so that the heat conduction through the sealing sleeve section remains low. Thus, the sealing sleeve section can be made of titanium or a titanium alloy, for example, and the heat conducting body can be made of copper or a copper alloy.

[0016] It may be provided that the abutment element comprises an annular, cuboid or polygonal base body, on which the at least two elements are supported directly or indirectly.

[0017] Therefore, the present invention can be well implemented on hot runner nozzles with different geometric configurations and is not limited to the above-mentioned shapes.

[0018] It can also be provided that the tip of the shut-off needle protrudes beyond the outer circumference of the nozzle body, at least into one of the functional positions into which the respective shut-off needle can be moved, wherein the abutment element is each arranged substantially between the drive device and the tip element. In this way, the invention can be implemented simply and well on hot runner nozzles having different geometrical configurations.

[0019] According to a further embodiment, it can be conveniently and advantageously proposed that the arch seat element comprises at least one bridge section, wherein at least one bridge section is penetrated by one of the closing needles, wherein the end of the closing needle facing away from the tip protrudes from the bridge section, and the coupling device is coupled to the drive device at the bridge section.

[0020] The coupling of the closing needle to the drive device can be implemented in a simple manner in this way, without the abutment element hindering this connection.

[0021] According to a further option, provision can also be made for the respective bridge section of the annular abutment element to overlap with a step of the heat conducting body of the respective tip element or of the needle sealing and guiding sleeve, thereby particularly advantageously supporting the tip element.

[0022] It can also be advantageously provided that the annular abutment element is designed such that it can be mounted after the tip element and removed before the tip element, which simplifies the overall mounting and removal of the tip element.

[0023] It is structurally simple if the coupling device is formed as a one-piece or multi-piece shaped element. The coupling device can be formed, for example, in the shape of an angle or a hammer head and each engage in the drive device. The drive device can include a plurality of slide grooves in which the corresponding shaped elements engage.

[0024] It can advantageously be provided here that the link of the annular drive is oriented partially or completely obliquely with respect to the displacement direction of the drive in order to move the shut-off needle forwards and backwards.

[0025] For example, the slide groove may be formed to be straight or curved.

[0026] According to a variant, the slide groove may be formed as an oblong hole, however, the slide groove may also be formed to be closed toward one side.

[0027] With regard to the needle seal and guide sleeve, it can advantageously be provided that the needle seal and guide sleeve is screwed into the heat conducting body, so that the needle seal and guide sleeve is simply and securely fixed in the heat conducting body.

[0028] It can be provided that the needle sealing and guide sleeve is formed with a through hole for the sealing guide of the shut-off needle. This means that the gap between the shut-off needle and the hole of the needle sealing and guide sleeve is narrow in size so that, on the one hand, axial mobility of the shut-off needle is provided, but on the other hand, melt cannot pass through the needle sealing and guide sleeve to a practically appreciable extent. For this purpose, the shut-off needle and the needle sealing and guide sleeve preferably have equal or substantially equal coefficients of thermal expansion.

[0029] Advantageously, a hole is formed in the heat conducting body, through which the shut-off needle penetrates, wherein an annular channel formed for the passage of melt is formed around the shut-off needle between the end of the heat conducting body facing the tip and the needle sealing and guide sleeve. It can also be provided that at least one, two or more feed holes extending obliquely to the annular channel are formed in the heat conducting body to feed the melt from the nozzle body into the annular channel.

[0030] It can also be provided that the needle seal and the guide sleeve are screwed into the heat conducting body. In this way, the needle seal and the guide sleeve can be pre-installed in the heat conducting body in a simple manner and held securely in the heat conducting body.

[0031] Furthermore, a particularly advantageous nozzle holder is provided. According to a further variant, it can advantageously be provided that the abutment element is designed to be removable and that it preferably comprises a removal device for removal. In this way, the abutment element can be easily replaced.

[0032] It can be provided in a structurally advantageously simple manner that the annular seat element is arranged radially outside a drive ring forming the drive device.

[0033] Only a single abutment element may be provided, whereby only a single abutment element may also be installed and, if necessary, also only a single abutment element may be removed. However, this is not necessary. It may also be provided that a plurality of abutment elements are used between the nozzle body and the pressure cap.

[0034] Finally, it is advantageously provided that the support for the tip element is arranged on the abutment element between the tip of the shut-off needle and the drive device.

[0035] It can also be provided that the corresponding shut-off needle can be positioned in different operating positions or can be positioned during operation using the drive device and / or the position of the shut-off needle is approached or can be approached at a predetermined speed or speed profile during operation.

[0036] The invention also provides an advantageous and simple method for removing one or more tip elements of a hot runner nozzle, the hot runner nozzle having a nozzle body and a pressure cap, the hot runner nozzle, wherein the tip elements are arranged between the nozzle body and the pressure cap, the tip elements are inserted into recesses in the nozzle body and are each penetrated by a movable shut-off needle, the shut-off needles each having a tip, each tip protruding beyond the outer circumferential edge of the nozzle body at least in the operating position, wherein the shut-off needles each comprise a coupling device at their end facing away from the tip, the coupling device being coupled to a drive device for moving the shut-off needles, wherein the one or more tip elements are supported on an abutment element, the abutment element being inserted between the nozzle body and the pressure cap, wherein the method comprises the following steps:

[0037] 100) removing the pressure cover;

[0038] 200) After step 100), the one-piece or multi-piece drive device is removed, thereby separating the corresponding tip element from the drive device,

[0039] 300) after step 200), removing at least one abutment element or a plurality of abutment elements; and

[0040] 400) After step 300), the one or more tip elements are removed.

[0041] This removal method is particularly simple, since the respective tip element can be removed directly from the hot runner nozzle after removing the drive device associated with the respective tip element and the abutment element associated with the respective tip element, in order to replace the respective tip element. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In the following, the invention is explained in more detail based on exemplary embodiments with reference to the drawings. The solutions of the drawings shown are particularly advantageously suitable for the nozzle bodies and tip elements shown in the following drawings. However, the invention is not limited to these special embodiments but can also be implemented in other ways within the scope of the claims. In the drawings:

[0043] Figure 1 a to Figure 1 c: Figure 1 a shows a perspective view of a section of a hot runner device with a hot runner nozzle, which comprises a multi-piece nozzle body with a tip element and a shut-off needle inserted therein together with a drive device for the shut-off needle, and Figure 1 b shows the Figure 1 an arrangement in which there is no pressure cover, and Figure 1 c shows the installation of the tip element using an installation tool;

[0044] Figure 2 : Shows from Figure 1 An exploded view of the components of a;

[0045] Figure 3 : A cross-sectional view showing a tip element;

[0046] Figure 4 a. Figure 4 b: Figure 4 a shows the Figure 1 a perspective view of a hot runner nozzle without the pressure cap and drive ring, but with a portion of the tip element and with the abutment and pressure ring, and Figure 4 b shows the Figure 4 A top view of the arrangement of a;

[0047] Figure 5 a. Figure 5 b: Shows the Figure 4 An arrangement with two tip elements, without a pressure cap having a drive rod, Figure 5 A shows a top view, and Figure 5 A cross-sectional view is shown in b;

[0048] Figure 6 : Shows the basis for passing through the tool Figure 1 and Figure 5 Type of hot runner nozzle cross section;

[0049] Figure 7 :exist Figure 7 a. Figure 7 b and Figure 7 c shows a top view of a pressure cap of a hot runner nozzle with a local area of ​​the tip element on the mold cavity of the tool in three different operating positions; and

[0050] Figure 8 : Figure 8 a and Figure 8 A perspective view and an exploded view of another hot runner nozzle are shown in b. DETAILED DESCRIPTION

[0051] Terms such as "upper" or "lower" etc. should not be understood as limiting but merely relate to the corresponding arrangements and alignments in the drawings.

[0052] Figure 1 A section of a hot runner arrangement is shown having a hot runner nozzle 1 which is designed for lateral casting of plastic components.

[0053] To this end, a hot runner nozzle 1 for lateral casting comprises a nozzle body 2 and a pressure cap or clamping cap 3 which is removably fastened to the nozzle body 2 .

[0054] The hot runner nozzle 1 may further comprise a nozzle holder 4 , with which the hot runner nozzle or its nozzle body 2 can be fixed to further elements of the hot runner arrangement (not shown here).

[0055] The pressure cap 3 may be secured using a fastening device (eg formed as one or more screws 5 ( Figure 2 )) is releasably fastened to the nozzle body 2.

[0056] The nozzle body 2 may have a substantially cylindrical base shape, so that it has a substantially cylindrical outer jacket with side faces MF. Figure 1 a to Figure 1 c shows such an exemplary embodiment. However, the present invention is not limited thereto. The nozzle body 2 may also have a different base shape. Figure 8 In an exemplary embodiment of the present invention, the nozzle body is formed into a nearly rectangular parallelepiped, so that the nozzle body has corresponding rectangular parallelepiped lateral surfaces.

[0057] By definition, the nozzle body 2 has a main extension direction HE. In a cylindrical base shape, this may be the longitudinal axis of the cylinder.

[0058] The pouring or extrusion of the plastic melt takes place laterally, in particular perpendicularly, relative to the main extension direction HE, which here can also mean that the plastic extrusion takes place exactly or nearly perpendicularly to the side surface MF. Using the hot runner nozzle 1, the melt can advantageously be ejected perpendicularly to the side surface MF at a plurality of points of the side surface MF (angularly offset in the circumferential direction).

[0059] To achieve this, various functional elements and functional contours are formed between the nozzle body 2 and the pressure cap 3 .

[0060] The nozzle body 2 thus has an axial side at its end facing the pressure cap 3, which is provided with at least one or more recesses 6, here for example arranged radially or distributed circumferentially on the axial side, for arranging and receiving the tip element 7. Corresponding recesses are formed in the pressure cap 3 (not shown here).

[0061] One of the tip elements 7 is arranged in each of the recesses 6 .

[0062] The following description of the tip element 7 also applies to Figures 1 to 8 When the position of only one of the tip elements or a plurality of tip elements 7 at other points is further described below, it is obvious that these features can also be provided separately in the case of a plurality of tip elements 7.

[0063] Tip element 7 (see Figure 3 ) each comprises a heat conducting body 8 (as a matrix). The heat conducting body 8 structurally also forms a type of matrix of the corresponding tip element 7.

[0064] The heat conducting body 8 further comprises a sealing sleeve section 9. The sealing sleeve section 9 may be formed integrally with the heat conducting body 8 (as shown here) or as a sleeve element separate therefrom (not shown here, see for example WO 2010 / 127965A).

[0065] The heat conducting bodies 8 may have a type of cuboid shape, wherein the respective cuboid heat conducting body 8 may be aligned approximately radially on the hot runner nozzle 1 (if the nozzle body is cylindrical).

[0066] Each heat conducting body 8 may have a hole 10 extending longitudinally therethrough. The hole 10 may be formed in a stepped shape. Therefore, the hole 10 may include hole sections 10a, 10b, 10c (here three) of different diameters.

[0067] At one end, the heat conducting body 8 may include a type of protrusion 11. The protrusion 11 may be formed in a cylindrical shape. It faces the tool or mold cavity ( Figure 7 ) orientation, but preferably without touching the tool or the mold cavity. At its other end, a sealing and guiding sleeve 12 (hereinafter also synonymously referred to as guiding sleeve 12) can be inserted into the heat-conducting body 8, which sealing and guiding sleeve is formed here as a threaded sleeve with a through hole for sealing guidance of the closing needle 14. The sealing and guiding sleeve 12 can be screwed into the hole section 10b which also has an internal thread.

[0068] A respective sealing and guiding sleeve 12 can protrude axially from the bore 10 and thus from the heat conducting body 8. For example, the sealing and guiding sleeve can there comprise a polygonal end 121. The sealing and guiding sleeve 12 itself comprises a through hole 122.

[0069] The entire tip element 7, and therefore both the heat conducting body 8 and the sealing and guide sleeve 12, is axially penetrated by a closure needle 14, which also protrudes axially on both sides from the tip element 7. The diameters of the closure needle 14 and the through hole 122 are matched so that the closure needle 14 is guided and sealed in the hole.

[0070] In contrast, in the area of ​​the hole section 10a in front of the sealing and guide sleeve 12, the diameter can be selected so that an annular channel 13 is preferably formed concentrically around the closing needle 14, through which the melt can be conducted upward into the area of ​​the tip 15 of the closing needle 14 which can protrude from the heat-conducting body 8.

[0071] At least one feed hole 131 which is aligned obliquely with the annular channel 13 may open into the annular channel 13, through which feed hole the melt can be conducted from the nozzle body 2 into the annular channel 13. A plurality of such feed holes 131 may also be provided for each tip element 7.

[0072] The displaceably guided closing needle 14 can have the tip 15 protrude from the protrusion 11 in at least one operating position and can be moved forward and backward using a drive device of a driver.

[0073] In order to achieve good temperature control of the melt reaching the surface of the product, the closing needle 14 will direct its tip 15 to the surface of the product ( Figure 6 , Figure 7 a to Figure 7 c). The injected or manufactured plastic part is injected into a mold W (hereinafter also referred to as a molding tool), wherein here in particular a mold plate F is shown, which includes a gate hole A, which is associated with a mold cavity FN. The gate hole A for the plastic can be closed by a closing needle 14, the tip of which is at Figure 7 The closed position of a seals the gate hole A of the closed mold plate F so that plastic can no longer enter the mold. Figure 7 In b, the closing needle 14 including the tip 15 is retracted so that the melt can flow through the gate hole A. Figure 7 c shows the injection position for injecting the plastic part.

[0074] On its axial side facing away from the pressure cover 3 ( Figure 1 The nozzle body 2 includes a melt channel 17 ( Figure 5 , which is not fully visible here), the melt channel can be divided into sub-channels 18, wherein the corresponding sub-channel 18 leads to one of the feed holes 131, so that the melt can be conducted to the annular channel 13 through the hole 131 and to the mold cavity F through the gate opening A.

[0075] In order to move the shut-off needle 14 using the drive device, the shut-off needle 14 comprises, at its end facing away from the tip 15 which projects from the heat-conducting body 8 and the sealing and guide sleeve 12 at the end facing away from the tip 15, a coupling device 16 for coupling the shut-off needle 14 to the drive device. The coupling device 16 is here embodied in a simple manner as an angle which extends approximately perpendicularly to the main extension direction of the shut-off needle 14.

[0076] The heat conducting body 8 of the tip element 7 , which forms a projection 11 at its outermost end, projects radially outwards beyond the circumferential edge of the nozzle body 2 .

[0077] The tip elements 7 are designed such that after insertion into the recess 6, they are held laterally by sections of the radially outer circumferential wall 19, which tip elements can be penetrated in each case by the projection 11 and the sealing sleeve section 9 of the respective tip element 7 and by the rear abutment element 20 in one or more directions, at least in the hot state.

[0078] The tip element may be held laterally by further walls 21, 22 of the recess 6. The tip element is held by the nozzle body 2 and the pressure cap 3 from above and below.

[0079] The sealing sleeve section 9 is also supported on the mold tool W (see Figure 4 , Figure 7 c).

[0080] In the hot state, the respective tip element is supported in this way between the tool and the abutment element 20 .

[0081] The tip element 7 can be used in the cold state, for example using a screw 23 ( Figure 1 c) is inserted into the recesses 6 with some play, the tool being screwed into the threaded hole 24 of the tip element and being released after the insertion. In the heated state, the tip element is firmly seated in these recesses 6, wherein a firm seating of the heat-conducting body 8 is produced between the abutment element 20 and the tool, on which the sealing sleeve section 9 supports itself.

[0082] The abutment element 20 can be designed such that it can be inserted into the nozzle body 2 and can be removed therefrom. For each tip element 7, the abutment element 20 can in particular form a type of U-shaped bridge section 201 in each case. The abutment element can include a removal device 31 for removal. This can be designed as at least one threaded hole into which a screw or the like can be screwed, and the abutment element can then be removed using this threaded hole (see Figure 1 b) In this way, the abutment element can be easily replaced if necessary.

[0083] according to Figure 1 , the corresponding bridge section 201 can overlap with the tip element 7 from above in the direction of the pressure cover 3 (for example, in the area of ​​the corresponding polygonal end or in the area of ​​the step, etc.), and fix the tip element when the pressure cover is placed in the main extension direction HE and preferably perpendicular to it (for example, radially inward).

[0084] In this way, the circumferentially distributed tip elements 7 can be combined with the bridge sections 201 required on all sides to form a surrounding element. Figures 1 to 7 Such an enclosing element comprising a plurality of bridge segments 201 is a ring, for example a circumferentially closed polygonal ring.

[0085] Each bridge section 201 then overlaps, for example, with a corresponding polygonal end 121 of a corresponding needle seal and guide sleeve 12. The lower web 202 of the bridge section 201 can be held by a collar ( Figure 4 a) or in a recess 6 etc., so that the abutment element 20 is firmly supported there.

[0086] The tip element 7 can be mounted well in this way, so first install these ( Figure 1 c) and then installing the abutment element 20 (here an annular abutment element 20).

[0087] In this state, the tip element 7 is then pressed by the pressure cap 3 against the nozzle body 2 in the direction of the main extension direction HE, wherein the surface of the tip element 7 can support itself at least in the heated state of the hot runner nozzle on the web 202 of the abutment element 20. It is also provided here that the support of the tip element 7 is arranged on the abutment element 20 between the tip 15 of the closing needle 14 and the drive means 28, 29.

[0088] The coupling means 16 (e.g., a horn) of the closing needle 14 can engage in a slideway 26 of a drive means (here a rotatable drive ring 27) which can be rotated using a driver. For this purpose, the drive ring 27 can be coupled, for example, to a shaft 30 ( Figure 6 ), which is connected to a drive rod 29, which can be moved via a motor (not shown here) or the like, for example, can be pivoted in the circumferential direction or in the opposite direction thereof.

[0089] The drive ring 27 may be located at Figure 1 The closing needle 14 can then be simply moved back and forth to open or close the gate hole A by rotating the drive ring 27 with the slide groove 26 aligned obliquely in the circumferential direction.

[0090] The slide groove 26 may be formed as a straight rectangular hole with corners joined therein or may be formed in other shapes.

[0091] This type of drive is advantageous. However, other types of drives may also be selected.

[0092] As shown in all the figures, it can advantageously be provided that the tip element 7 is supported on the abutment element 20 and is arranged between the tip 15 of the shut-off needle 14 and the drive device 28 , 29 .

[0093] exist Figure 8 In the exemplary embodiment of the present invention, the nozzle body 2 is formed as a rectangular parallelepiped. The pressure cap 3 can be formed into a polygonal shape accordingly. Here it consists of two parts. It can also be used, for example, with a screw 5 ( Figure 8 The fastening device of b) is fixed on the nozzle body 2.

[0094] A recess 6 for a tip element 7 is in turn formed in the nozzle body 2. The tip element 7 may Figure 3 The recess 6 may also be formed as Figure 1 The recess 6 is provided as above.

[0095] The drive device here may not be formed as a rotatable ring, but as a linearly movable drive strip 28, which includes a slide groove (not visible here) in which the coupling device 16 engages, wherein the slide groove can be designed so that the closing needle 14 moves back and forth with the linear movement of the drive strip 28.

[0096] The drive strip 28 can additionally be moved by a drive which is not shown here.

[0097] The tip element 7 can be Figure 8 One or more of the tip elements 7 oriented, for example facing in opposite directions in the exemplary embodiment of the nozzle body 2 are arranged towards opposite sides.

[0098] The recess 6 can be designed similar to Figures 1 to 7 This means that there is in each case a front wall 19 oriented toward the molding tool W, and lateral walls 21, 22. The abutment element can in turn comprise one or more bridge sections 201. Two of the bridge sections are combined here as an example to form an abutment element 20. This can be inserted into the nozzle body 2. The bridge sections form an abutment for the respective tip element 7, which in turn can support itself on the tool in the opposite direction.

[0099] Reference numerals list

[0100] Hot channel nozzle 1

[0101] Nozzle body 2

[0102] Pressure cap 3

[0103] Nozzle holder 4

[0104] Screw 5

[0105] Recess 6

[0106] Tip Components 7

[0107] Heat conducting body 8

[0108] Sealing sleeve section 9

[0109] Hole 10

[0110] Hole sections 10a, 10b, 10c

[0111] Protrusion 11

[0112] Needle seal and guide sleeve 12

[0113] Polygonal end 121

[0114] Through hole 122

[0115] Ring channel 13

[0116] Feed hole 131

[0117] Closed needle 14

[0118] Tip 15

[0119] Connecting device 16

[0120] Melt channel 17

[0121] Subchannel 18

[0122] Wall 19

[0123] Abutment element 20

[0124] Bridge Section 201

[0125] Belly 202

[0126] Wall 21, 22

[0127] Screw 23

[0128] Threaded holes 24

[0129] Chute 26

[0130] Drive ring 27

[0131] Drive bar 28

[0132] Driving rod 29

[0133] Axis 30

[0134] Remove device 31

[0135] Main extension direction HE

[0136] Gate hole A

[0137] Template F

[0138] Mold Tool W

[0139] Cavity FN

[0140] Lateral surface MF.

Claims

1. A hot runner nozzle for lateral casting of plastic parts, the hot runner nozzle having a nozzle body (2) and a pressure cover (3), wherein a tip element (7) is arranged between the nozzle body (2) and the pressure cover (3), wherein the tip elements are each inserted into a recess (6) in the nozzle body (2) and are each penetrated by a movable closing needle having a tip (15), the tip protruding beyond the outer circumferential edge of the nozzle body at least in the operating position, wherein the closing needle (14) includes a coupling device (16) at its end facing away from the tip (15), the coupling device being connected to a drive device (28, 29) for moving the closing needle (14), characterized in that The tip element (7) is also supported on its side facing away from the corresponding tip (15) of the shut-off needle (14) on an abutment element (20), which is inserted between the nozzle body (2) and the pressure cap (3), wherein the abutment element (20) is designed to be removable.

2. The hot runner nozzle according to claim 1, characterized in that: The tip elements (7) each comprise a heat conducting body (8) and a respective closing needle (14) which completely penetrates the heat conducting body.

3. The hot runner nozzle according to claim 2, characterized in that: The tip element (7) also comprises a needle seal and guide sleeve (12), through which the corresponding closure needle (14) also completely penetrates.

4. The hot runner nozzle according to any one of claims 1 to 3, characterized in that: The abutment element (20) comprises a removal device (31) for removal.

5. The hot runner nozzle according to claim 2 or 3, characterized in that: A sealing sleeve section (9) is also formed on the heat-conducting body (8) for supporting the tip element on a tool on the side facing away from the abutment element (20). The sealing sleeve section is formed integrally with the heat-conducting body or is formed as a separate sleeve separated from the heat-conducting body.

6. The hot runner nozzle according to claim 5, characterized in that: The sealing sleeve section (9) is made of a material having a lower thermal conductivity than the heat-conducting body.

7. The hot runner nozzle according to any one of claims 1 to 3, characterized in that: The nozzle body (2) is cylindrical or polygonal, and two or more of the tip elements (7) are distributed on the outer circumference of the nozzle body (2), wherein the abutment elements (20) are each substantially arranged between the drive device (28, 29) and the tip element (7).

8. The hot runner nozzle according to claim 3, characterized in that: The abutment element (20) comprises at least one bridge section (201), wherein at least one bridge section (201) is penetrated by one of the closing needles (14), wherein the end of the closing needle (14) facing away from the tip (15) protrudes through the bridge section (201), and the coupling device (16) is coupled to the drive device (28, 29) at the bridge section.

9. The hot runner nozzle according to claim 8, characterized in that: The bridge section (201) of the abutment element (20) overlaps with a step of the heat conducting body (8) of a corresponding tip element (7) or of the needle sealing and guiding sleeve (12).

10. The hot runner nozzle according to any one of claims 1 to 3, characterized in that: The abutment element (20) is designed to be installed after the tip element (7) in terms of time and to be removed before the tip element.

11. The hot runner nozzle according to any one of claims 1 to 3, characterized in that: The coupling device (16) is designed as a one-piece or multi-piece molded element, each of which engages in one of the plurality of guide grooves (26) of the drive device (28, 29).

12. The hot runner nozzle according to claim 11, characterized in that: The guideway (26) of the drive device is oriented partially obliquely or completely obliquely or in a curved manner relative to the movement direction of the drive device.

13. The hot runner nozzle according to claim 3, characterized in that: The needle seal and guide sleeve (12) is screwed into the heat conducting body (8).

14. The hot runner nozzle according to claim 3, characterized in that: The needle sealing and guiding sleeve (12) is formed with a through hole (122) for sealingly guiding the closing needle (14).

15. The hot runner nozzle according to claim 3, characterized in that: A hole (10) is formed in the heat conducting body (8), through which the shut-off needle (14) penetrates, wherein an annular channel (13) designed to let the melt pass is formed around the shut-off needle (14) between the end of the heat conducting body (8) facing the tip (15) and the needle sealing and guiding sleeve (12).

16. The hot runner nozzle according to claim 15, characterized in that: At least one feed hole (131) is formed in the heat-conducting body (8) and extends obliquely to the annular channel (13) so as to feed the melt from the nozzle body (2) into the annular channel (13).

17. The hot runner nozzle according to any one of claims 1 to 3, characterized in that: The tip element (7) is pressed against the nozzle body (2) by the pressure cap (3) in the direction of the main extension direction (HE), and wherein at least the surface of the tip element (7) in the heated state of the hot runner nozzle supports itself on the web (202) of the abutment element (20).

18. The hot runner nozzle according to claim 17, characterized in that: The pressure cover (3) secures the separate abutment element (20) in the installed state against unauthorized displacement in the main extension direction (HE).

19. The hot runner nozzle according to any one of claims 1 to 3, characterized in that: The abutment element (20) comprises an annular, rectangular or polygonal base body, on which at least two tip elements (7) support themselves directly or indirectly.

20. The hot runner nozzle according to any one of claims 1 to 3, characterized in that: A plurality of abutment elements (20) are interposed between the nozzle body (2) and the pressure cap (3).

21. The hot runner nozzle according to any one of claims 1 to 3, characterized in that: A tip element (7) is supported and arranged on the abutment element (20) between the tip (15) of the closing needle (14) and the drive device (28, 29).

22. The hot runner nozzle according to any one of claims 1 to 3, characterized in that: By using the drive devices (28, 29), the respective shut-off needle (14) can be positioned in different operating positions.

23. The hot runner nozzle according to any one of claims 1 to 3, characterized in that: Using the drive means (28, 29), the respective shut-off needle (14) can be positioned in different operating positions and the position of the shut-off needle (14) can be approached at a predetermined speed or speed profile.

24. A method for removing one or more tip elements (7) of a hot runner nozzle, the hot runner nozzle having a nozzle body (2) and a pressure cover (3), wherein the one or more tip elements (7) are arranged between the nozzle body (2) and the pressure cover (3), the tip elements are each inserted into a recess (6) of the nozzle body (2) and are each penetrated by a movable closing needle (14) having a tip (15), each tip being positioned beyond the outer circumferential edge of the nozzle body at least in an operating position, wherein the closing needle (14) has a coupling device (16) on its end facing away from the tip (15), the coupling device being coupled to a drive device (28, 29) for moving the closing needle (14), wherein the one or more tip elements (7) are supported on an abutment element (20), the abutment element being inserted between the nozzle body (2) and the pressure cover (3), It is characterized by the following steps: 100) removing the pressure cover (3); 200) After step 100), the one-piece or multi-piece drive device (28, 29) is removed, thereby separating the corresponding tip element (7) from the drive device, 300) after step 200), removing at least one abutment element or a plurality of abutment elements (20); as well as 400) After step 300), the one or more tip elements (7) are removed.

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