An extrusion die with one mold and two cavities for a skeleton-containing automotive sealing strip product

Abstract

The present invention relates to the technical field of extrusion molding, and particularly relates to a double-cavity extrusion die for a skeleton-containing automotive sealing strip product, comprising: a glue inlet template, a soft glue inlet assembly, and a hard glue inlet assembly that are sequentially stacked; a soft glue main runner is arranged inside the soft glue inlet assembly, an auxiliary glue channel in the soft glue inlet assembly is correspondingly arranged with a soft glue sub-runner, and one end of the auxiliary glue channel is communicated with the soft glue sub-runner, and the other end penetrates through the soft glue inlet assembly; a preformed glue channel is communicated with the auxiliary glue channel; a plurality of hard glue sub-runners are arranged inside the hard glue inlet assembly, a hard glue forming cavity and a soft glue forming cavity are arranged on one surface of the hard glue inlet assembly, and the soft glue forming cavity extends from the glue inlet template towards the soft glue inlet assembly and penetrates through the soft glue inlet assembly. By designing a multi-layer structure arranged in a stacked manner and respectively designing the flow channels for soft glue and hard glue, the glue inlet is divided into upper and lower parts, and the cold glue and hard glue are fed simultaneously, so that the glue inlet pressure is more uniform, and the double-cavity simultaneous extrusion of the skeleton-containing product is realized.

Description

Technical Field

[0001] The invention relates to the technical field of extrusion molding, and in particular to a one-mold double-cavity extrusion die for a skeleton-containing automobile sealing strip product. Background Art

[0002] In production and processing, extrusion processing is a method with a relatively wide range of applications. It can be used for the processing of plastic parts, rubber parts and metal parts. Extrusion processing uses an extruder and various extruder heads to achieve extrusion molding of various products. In today's increasingly large automobile market, the production and processing demand for automobile parts is huge. For example, automobile sealing strips, although they are very small parts, their quality is directly related to the sealing of the car door, and their usage is relatively large.

[0003] When extruding automobile sealing strips with metal skeletons, the fluidity of the extruded rubber is required to be high. During extrusion, the skeleton often fails to fully cover the product and bubbles appear on the surface of the product, resulting in product scrapping. When extruding automobile sealing strips with metal skeletons, the extrusion speed needs to be strictly controlled, resulting in low extrusion efficiency. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of poor extrusion molding quality and low efficiency of automobile sealing strips with metal skeletons in the prior art, thereby providing a one-mold double-cavity extrusion die for automobile sealing strips with skeletons.

[0005] In order to solve the above technical problems, the present invention provides a one-mold double-cavity extrusion die for a skeleton-type automobile sealing strip product, comprising: a glue feeding template, a soft glue feeding component and a hard glue feeding component which are stacked in sequence;

[0006] The soft glue inlet assembly is provided with a soft glue main flow channel, the inlet end of the soft glue main flow channel is provided on the side of the soft glue inlet assembly, the outlet end of the soft glue main flow channel is provided with a plurality of soft glue branch flow channels, and the soft glue inlet assembly is provided with a plurality of auxiliary glue channels along the axial direction, the auxiliary glue channels are provided corresponding to the soft glue branch flow channels, and one end of the auxiliary glue channel is connected to the soft glue branch flow channel, and the other end is provided toward the glue inlet template and penetrates the soft glue inlet assembly;

[0007] A preformed glue channel is arranged on one side of the glue feeding template facing the soft glue feeding component, and the preformed glue channel is connected to the auxiliary glue channel;

[0008] A plurality of hard glue shunt channels are arranged in the hard glue inlet assembly, and the inlet ends of the plurality of hard glue shunt channels are all arranged on the side of the hard glue inlet assembly. A hard glue molding cavity is arranged on one side of the hard glue inlet assembly, and a skeleton cavity is arranged axially through the hard glue inlet assembly, and the skeleton cavity is connected with the hard glue molding cavity;

[0009] Also includes:

[0010] The soft glue molding cavity extends from the glue feeding template toward the soft glue feeding component and penetrates the soft glue feeding component. The soft glue molding cavity is aligned with the hard glue molding cavity, and the preformed glue channel is connected to the soft glue molding cavity.

[0011] Optionally, an air inlet duct is axially arranged on the glue feeding template, the air inlet duct passes through the glue feeding template and partially extends into the soft glue feeding assembly, the air inlet duct is arranged between the preformed glue channel and the soft glue molding cavity, and an air duct insert is installed in the air inlet duct, a glue passing space is reserved between the air duct insert and the side wall of the air inlet duct, and a connecting groove is provided between the air inlet duct and the soft glue molding cavity.

[0012] Optionally, a glue feeding groove is provided on a surface of the glue feeding template facing away from the soft glue feeding component, and the soft glue molding cavity and the air inlet channel are both connected to the glue feeding groove.

[0013] Optionally, the airway insert includes a positioning portion and a shaping portion, the shaping portion is arranged in the air inlet, and the positioning portion is embedded and installed in the glue injection template and / or the soft glue injection component.

[0014] Optionally, a hollow tube is installed in the skeleton cavity, and the inner cavity of the hollow tube is used to accommodate the skeleton body.

[0015] Optionally, the hollow tube extends into the soft rubber molding cavity.

[0016] Optionally, the soft glue injection assembly includes a first soft glue template and a second soft glue template that are stacked, and the soft glue main channel is arranged between the first soft glue template and the second soft glue template.

[0017] Optionally, the hard glue injection assembly includes a first hard glue template and a second hard glue template, and the hard glue diversion channel is arranged between the first hard glue template and the second hard glue template.

[0018] Optionally, it also includes a positioning hole, which passes through the glue feeding template, the soft glue feeding component and the hard glue feeding component in sequence along the axial direction.

[0019] Optionally, mold grooves are provided on the sides of the soft glue feeding component and the hard glue feeding component.

[0020] The technical solution of the present invention has the following advantages:

[0021] 1. The one-mold dual-cavity extrusion die for a skeleton-containing automobile sealing strip product provided by the present invention comprises: a glue feeding template, a soft glue feeding component and a hard glue feeding component which are stacked in sequence; the soft glue feeding component is provided with a soft glue main flow channel inside, the inlet end of the soft glue main flow channel is provided on the side of the soft glue feeding component, the outlet end of the soft glue main flow channel is provided with a plurality of soft glue branch flow channels, a plurality of auxiliary glue channels are provided axially inside the soft glue feeding component, the auxiliary glue channels are provided correspondingly to the soft glue branch flow channels, one end of the auxiliary glue channel is connected to the soft glue branch flow channel, and the other end is provided toward the glue feeding template and penetrates the soft glue feeding component; the glue feeding template A preformed glue channel is arranged on the side facing the soft glue inlet component, and the preformed glue channel is connected with the auxiliary glue channel; a plurality of hard glue diversion channels are arranged in the hard glue inlet component, and the inlet ends of the plurality of hard glue diversion channels are all arranged on the side of the hard glue inlet component; a hard glue molding cavity is arranged on one side of the hard glue inlet component, and a skeleton cavity is arranged axially through the hard glue inlet component, and the skeleton cavity is connected with the hard glue molding cavity; it also includes: a soft glue molding cavity, which extends from the glue inlet template toward the soft glue inlet component and passes through the soft glue inlet component, the soft glue molding cavity is aligned with the hard glue molding cavity, and the preformed glue channel is connected with the soft glue molding cavity.

[0022] In the process of producing products using an extrusion mold, the skeleton body is placed in the skeleton cavity, and the soft glue is introduced into the mold through the entrance of the soft glue main channel, and the hard glue is introduced into the mold through the entrance of the hard glue branch channel. After the soft glue enters the mold, it passes through the soft glue main channel, the soft glue branch channel, the auxiliary glue channel, and the pre-molding glue channel in sequence, first flows to the glue inlet template, and then enters the soft glue molding cavity for shaping; the hard glue directly enters the hard glue molding cavity through the hard glue branch channel for shaping. Since the soft glue has high fluidity, it takes a long time to cool and shape, while the hard glue has poor fluidity and is easier to shape. By allowing the soft glue to flow through a longer path before entering the soft glue molding cavity, the hard glue directly passes through the hard glue branch channel into the hard glue molding cavity, so that the soft glue and the hard glue can be cooled and shaped at the same time to form an integrated structure. By designing a stacked multi-layer structure and separately designing the flow channels for soft glue and hard glue, the glue is fed into two parts, the cold glue and hard glue are fed at the same time, the glue feeding pressure is more uniform, and the dual-cavity extrusion of frame-type products is achieved, which greatly improves the production efficiency of product extrusion molding.

[0023] 2. The one-mold dual-cavity extrusion die for the frame-containing automotive sealing strip product provided by the present invention has an air inlet duct axially arranged on the glue inlet template, which penetrates the glue inlet template and partially extends into the soft glue inlet assembly. The air inlet duct is arranged between the preformed glue channel and the soft glue molding cavity, and an air inlet block is installed in the air inlet duct. There is a glue passing space between the air inlet block and the side wall of the air inlet duct, and a connecting groove is arranged between the air inlet duct and the soft glue molding cavity. By setting the air inlet duct, the air in the mold is discharged while the glue is fed into the mold, so as to avoid the appearance of large bubbles in the molded product and improve the quality of the product.

[0024] 3. The one-mold dual-cavity extrusion die for the frame-containing automotive sealing strip product provided by the present invention has a glue inlet groove on the side of the glue inlet template away from the soft glue inlet component, and the soft glue molding cavity and the air inlet channel are both connected to the glue inlet groove. The soft glue flows into the soft glue molding cavity after passing through the pre-formed glue channel, and the glue inlet groove is provided to prevent the soft glue from overflowing from the glue inlet template and flowing out of the mold during the filling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the working state of a one-mold double-cavity extrusion die for a skeleton-containing automobile sealing strip product provided in an embodiment of the present invention.

[0027] Figure 2 It is a schematic structural diagram of a one-mold dual-cavity extrusion die for a skeleton-containing automotive sealing strip product provided in an embodiment of the present invention.

[0028] Figure 3 The exploded view of a one-mold dual-cavity extrusion die for a skeleton-containing automotive sealing strip product provided in an embodiment of the present invention.

[0029] Figure 4 This is an exploded view from another angle of the one-mold dual-cavity extrusion die for a skeleton-containing automobile sealing strip product provided in an embodiment of the present invention.

[0030] Figure 5 It is a schematic diagram of the top surface structure of the glue injection template provided in an embodiment of the present invention.

[0031] Figure 6 It is a schematic diagram of the bottom surface structure of the glue injection template provided in an embodiment of the present invention.

[0032] Figure 7 It is a schematic diagram of the structure of the airway insert provided in an embodiment of the present invention.

[0033] Figure 8 It is a schematic diagram of the top surface structure of the first soft glue template provided in an embodiment of the present invention.

[0034] Fig. 9 It is a schematic diagram of the bottom structure of the first soft glue template provided in an embodiment of the present invention.

[0035] Fig.10It is a schematic diagram of the top surface structure of the second soft glue template provided in an embodiment of the present invention.

[0036] Fig.11 It is a schematic diagram of the bottom surface structure of the second soft glue template provided in an embodiment of the present invention.

[0037] Fig.12 It is a schematic diagram of the top surface structure of the first hard plastic template provided in an embodiment of the present invention.

[0038] Fig.13 It is a schematic diagram of the bottom surface structure of the first hard plastic template provided in an embodiment of the present invention.

[0039] Fig.14 It is a schematic diagram of the top surface structure of the second hard plastic template provided in an embodiment of the present invention.

[0040] Fig.15 It is a schematic diagram of the structure of the lamination space provided in an embodiment of the present invention.

[0041] Fig.16 It is a schematic diagram of the structure of the connecting groove provided in an embodiment of the present invention.

[0042] Fig.17 It is a schematic structural diagram of the airway insert and the first soft rubber template provided in an embodiment of the present invention.

[0043] Fig.18 It is a structural schematic diagram of the coordinated installation of the airway insert and the glue-feeding template provided in an embodiment of the present invention.

[0044] Fig.19 It is a schematic structural diagram of the coordinated installation of the hollow tube and the skeleton cavity provided in an embodiment of the present invention.

[0045] Explanation of the accompanying drawings: 1. Glue inlet template; 2. First soft glue template; 3. Second soft glue template; 4. First hard glue template; 5. Second hard glue template; 6. Soft glue main channel; 7. Soft glue branch channel; 8. Auxiliary glue channel; 9. Preformed glue channel; 10. Air inlet; 11. Air channel insert; 12. Positioning part; 13. Shaping part; 14. Connecting groove; 15. Glue inlet groove; 16. Hard glue branch channel; 17. Hard glue molding cavity; 18. Skeleton cavity; 19. Hollow tube; 20. Skeleton body; 21. Positioning hole; 22. Mold opening groove; 23. Soft glue molding cavity; 24. Glue passing space. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] like Figures 1 to 19 The figure shows a one-mold dual-cavity extrusion die for a skeleton-type automobile sealing strip product provided in this embodiment, comprising: a glue feeding template 1, a soft glue feeding component and a hard glue feeding component which are stacked in sequence.

[0051] The soft glue injection assembly is provided with a soft glue main flow channel 6 inside, the inlet end of the soft glue main flow channel 6 is provided on the side of the soft glue injection assembly, and the outlet end of the soft glue main flow channel 6 is provided with two soft glue branch channels 7, and two auxiliary glue channels 8 are provided in the axial direction inside the soft glue injection assembly, the auxiliary glue channels 8 are provided corresponding to the soft glue branch channels 7, and one end of the auxiliary glue channels 8 is connected to the soft glue branch channels 7, and the other end is arranged toward the injection template 1 and penetrates the soft glue injection assembly. In this embodiment, the soft glue injection assembly includes a first soft glue template 2 and a second soft glue template 3 stacked, and the soft glue main flow channel 6 is provided between the first soft glue template 2 and the second soft glue template 3, wherein the second soft glue template 3 is arranged toward the hard glue injection assembly.

[0052] A preformed glue channel 9 is provided on one side of the glue feeding template 1 facing the soft glue feeding component, and the preformed glue channel 9 is connected to the auxiliary glue channel 8. An air inlet channel 10 is axially provided on the glue feeding template 1, and the air inlet channel 10 runs through the glue feeding template 1 and partially extends into the soft glue feeding component. Specifically, the air inlet channel 10 runs through the first glue feeding template 1. The air inlet channel 10 is provided between the preformed glue channel 9 and the soft glue forming cavity 23, and an air channel insert 11 is installed in the air inlet channel 10. A glue passing space 24 is reserved between the air channel insert 11 and the side wall of the air inlet channel 10, and a connecting groove 14 is provided between the air inlet channel 10 and the soft glue forming cavity 23. The air channel insert 11 includes a positioning portion 12 and a shaping portion 13. The shaping portion 13 is provided in the air inlet channel 10, and the positioning portion 12 is embedded and installed in the glue feeding template 1 and / or the soft glue feeding component. A glue feeding groove 15 is provided on a side of the glue feeding template 1 facing away from the soft glue feeding assembly, and the soft glue molding cavity 23 and the air inlet duct 10 are both connected to the glue feeding groove 15 .

[0053] Two hard glue runners 16 are arranged in the hard glue injection assembly, and the inlet ends of the two hard glue runners 16 are arranged on the side of the hard glue injection assembly, and the two hard glue runners 16 share one inlet. A hard glue molding cavity 17 is arranged on one side of the hard glue injection assembly, and a skeleton cavity 18 is arranged axially through the hard glue injection assembly, and the skeleton cavity 18 is connected with the hard glue molding cavity 17. The soft glue molding cavity 23 extends from the injection template 1 toward the soft glue injection assembly and penetrates the soft glue injection assembly. The soft glue molding cavity 23 is aligned with the hard glue molding cavity 17, and the preformed glue channel 9 is connected with the soft glue molding cavity 23. A hollow tube 19 is installed in the skeleton cavity 18, and the inner cavity of the hollow tube 19 is used to accommodate the skeleton body 20. The hollow tube 19 extends to the soft glue molding cavity 23. In this embodiment, the hard glue injection assembly includes a first hard glue template 4 and a second hard glue template 5, and a hard glue diversion channel 16 is arranged between the first hard glue template 4 and the second hard glue template 5, wherein the first hard glue template 4 and the second soft glue template 3 are arranged adjacent to each other, and the hard glue molding cavity 17 is arranged on the side of the first hard glue template 4 facing the second soft glue template 3.

[0054] In order to facilitate the positioning of the installation direction of the glue feeding template 1, the soft glue feeding assembly and the hard glue feeding assembly, two groups of positioning holes 21 are arranged along the axial direction, and the positioning block sequentially penetrates the glue feeding template 1, the first soft glue template 2, the second soft glue template 3, the first hard glue template 4 and the second hard glue template 5. In order to facilitate mold opening, the sides of the first soft glue template 2, the second soft glue template 3 and the first hard glue template 4 are all provided with mold opening grooves 22.

[0055] In the process of producing products using an extrusion mold, the skeleton body 20 is placed in the skeleton cavity 18, and the soft glue is introduced into the mold through the entrance of the soft glue main channel 6, and the hard glue is introduced into the mold through the entrance of the hard glue branch channel 16. After the soft glue enters the mold, it passes through the soft glue main channel 6, the soft glue branch channel 7, the auxiliary glue channel 8, and the pre-formed glue channel 9 in sequence, first flows to the glue inlet template 1, and then enters the soft glue molding cavity 23 for shaping; the hard glue directly enters the hard glue molding cavity 17 through the hard glue branch channel 16 for shaping. Since the soft glue has high fluidity, it takes a long time to cool and shape, while the hard glue has poor fluidity and is easier to shape. By allowing the soft glue to flow through a longer path before entering the soft glue molding cavity 23, the hard glue directly passes through the hard glue branch channel 16 and enters the hard glue molding cavity 17, so that the soft glue and the hard glue can be cooled and shaped at the same time to form an integrated structure. By designing a stacked multi-layer structure and separately designing the flow channels for soft glue and hard glue, the glue is fed into two parts, the cold glue and hard glue are fed at the same time, the glue feeding pressure is more uniform, and the dual-cavity extrusion of frame-type products is achieved, which greatly improves the production efficiency of product extrusion molding.

[0056] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A one-mold double-cavity extrusion die for skeleton-type automotive sealing strip products. It is characterized in that include: A glue feeding template (1), a soft glue feeding component and a hard glue feeding component are stacked in sequence; The soft glue injection assembly is provided with a soft glue main flow channel (6) therein, the inlet end of the soft glue main flow channel (6) is provided on the side of the soft glue injection assembly, the outlet end of the soft glue main flow channel (6) is provided with a plurality of soft glue branch flow channels (7), the soft glue injection assembly is provided with a plurality of auxiliary glue channels (8) along the axial direction, the auxiliary glue channels (8) are provided corresponding to the soft glue branch flow channels (7), one end of the auxiliary glue channel (8) is communicated with the soft glue branch flow channel (7), and the other end is provided toward the injection template (1) and penetrates the soft glue injection assembly; A preformed glue channel (9) is provided on a side of the glue feeding template (1) facing the soft glue feeding component, and the preformed glue channel (9) is connected to the auxiliary glue channel (8); A plurality of hard glue flow paths (16) are arranged in the hard glue injection assembly, and the inlet ends of the plurality of hard glue flow paths (16) are all arranged on the side of the hard glue injection assembly. A hard glue molding cavity (17) is arranged on one side of the hard glue injection assembly, and a skeleton cavity (18) is arranged in the hard glue injection assembly along the axial direction, and the skeleton cavity (18) is communicated with the hard glue molding cavity (17); Also includes: a soft glue molding cavity (23) extending from the glue feeding template (1) toward the soft glue feeding component and penetrating the soft glue feeding component, the soft glue molding cavity (23) being aligned with the hard glue molding cavity (17), and the preformed glue channel (9) being connected to the soft glue molding cavity (23); An air inlet duct (10) is axially arranged on the glue feeding template (1), the air inlet duct (10) passes through the glue feeding template (1) and partially extends into the soft glue feeding component, the air inlet duct (10) is arranged between the preformed glue channel (9) and the soft glue forming cavity (23), and an air duct insert (11) is installed in the air inlet duct (10), a glue passing space is reserved between the air duct insert (11) and the side wall of the air inlet duct (10), and a connecting groove (14) is arranged between the air inlet duct (10) and the soft glue forming cavity (23).

2. The one-mold double-cavity extrusion die for the skeleton-containing automotive sealing strip product according to claim 1, It is characterized in that A glue feeding groove (15) is provided on a surface of the glue feeding template (1) facing away from the soft glue feeding component, and the soft glue molding cavity (23) and the air inlet channel (10) are both in communication with the glue feeding groove (15).

3. The one-mold double-cavity extrusion die for the skeleton-containing automotive sealing strip product according to claim 1 or 2, It is characterized in that The airway insert (11) comprises a positioning portion (12) and a shaping portion (13), wherein the shaping portion (13) is arranged in the airway (10), and the positioning portion (12) is embedded and installed in the glue injection template (1) and / or the soft glue injection component.

4. The one-mold double-cavity extrusion die for the skeleton-containing automotive sealing strip product according to claim 1 or 2, It is characterized in that A hollow tube (19) is installed in the skeleton cavity (18), and the inner cavity of the hollow tube (19) is used to accommodate the skeleton body (20).

5. The one-mold two-cavity extrusion die for the skeleton-containing automotive sealing strip product according to claim 4, characterized in that, the hollow tube (19) extends into the soft rubber forming cavity (23) for arrangement.

6. The one-mold two-cavity extrusion die for the skeleton-containing automotive sealing strip product according to claim 1 or 2, characterized in that, the soft rubber feeding assembly includes a first soft rubber template (2) and a second soft rubber template (3) which are stacked, and the soft rubber main runner (6) is arranged between the first soft rubber template (2) and the second soft rubber template (3).

7. The one-mold two-cavity extrusion die for the skeleton-containing automotive sealing strip product according to claim 1 or 2, characterized in that, the hard rubber feeding assembly includes a first hard rubber template (4) and a second hard rubber template (5), and the hard rubber shunt runner (16) is arranged between the first hard rubber template (4) and the second hard rubber template (5).

8. The one-mold two-cavity extrusion die for the skeleton-containing automotive sealing strip product according to claim 1 or 2, characterized in that, it further includes a positioning hole (21), and the positioning hole (21) axially penetrates through the feeding template (1), the soft rubber feeding assembly and the hard rubber feeding assembly in sequence.

9. The one-mold two-cavity extrusion die for the skeleton-containing automotive sealing strip product according to claim 1 or 2, characterized in that, open die slots (22) are arranged on the sides of both the soft rubber feeding assembly and the hard rubber feeding assembly.

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