Extrusion molding device for foamed plastic products

Abstract

The present invention relates to the technical field of extrusion molding equipment, and in particular to an extrusion molding device for a foamed plastic product, which comprises an inner core, a positioning tube, a first sleeve, a second sleeve and a first rubber outlet sleeve. The first rubber outlet sleeve is arranged at the outlet of a first extrusion channel, wherein the inner wall of the first rubber outlet sleeve contacts a filling layer, and the outer wall of the first rubber outlet sleeve contacts an epidermis layer. Under the action of a first fitting groove and a first fitting protrusion, a protrusion is formed on the outer surface of the expanded filling layer, and a groove is formed on the inner surface of the epidermis layer after cooling. The automatic expansion of the filling layer can make the protrusion on its own outer surface enter the groove on the inner surface of the epidermis layer, thereby increasing the bonding effect between the filling layer and the epidermis layer, preventing stratification between the filling layer and the epidermis layer, and further increasing the overall protective effect of the plastic fender.

Description

Technical Field

[0001] The invention relates to the technical field of extrusion molding equipment, in particular to an extrusion molding device for foamed plastic products. Background Art

[0002] When a ship docks at a dock, it needs to pass a certain impact force to dock at the dock, so in order to protect the exterior of the ship from damage, it is necessary to install a plastic fender on the outside of the dock. Generally, the plastic fender is installed on the dock, or the plastic fender is floated on the water. The plastic fender is a thermoplastic engineering plastic with excellent comprehensive performance. The existing plastic fender is composed of an inner core, a filling layer and a skin layer from the inside to the outside. The traditional manufacturing method generally relies on an extrusion molding device, but the traditional extrusion molding device has a common problem when extruding the plastic fender, that is, the bonding force between the filling layer and the skin layer is often not strong enough, which leads to easy delamination. Once the filling layer and the skin layer are delaminated, the protective effect of the plastic fender can be affected.

[0003] The root cause of the problem of reduced protective effect of plastic fenders can be traced back to some factors in the extrusion process, among which gravity is one of them. Due to the influence of gravity, it is difficult for the filling layer to be evenly distributed during the extrusion process, which leads to an uneven structure inside the filling layer, thus affecting the protective effect of the plastic fender. Summary of the invention

[0004] The invention provides an extrusion molding device for foamed plastic products, so as to solve the problem that the protective effect of the plastic fender manufactured by the existing extrusion molding device is low.

[0005] The extrusion molding device of a foamed plastic product of the present invention adopts the following technical scheme:

[0006] A foamed plastic product extrusion molding device comprises an inner core, a positioning tube, a first sleeve, a second sleeve and a first rubber outlet sleeve.

[0007] The positioning tube is coaxially sleeved on the outside of the inner core, and the inner core can slide in the positioning tube along its own axial direction; the first sleeve can form a first extrusion channel with the positioning tube, and the heated filling layer material can flow in the first extrusion channel in a preset direction; the second sleeve can form a second extrusion channel with the first sleeve, and the heated skin layer material can flow in the second extrusion channel in a preset direction; the first rubber sleeve is arranged at the outlet of the first extrusion channel, and the inner wall of the first rubber sleeve is provided with a first fitting groove, and the outer wall of the first rubber sleeve is provided with a first fitting protrusion.

[0008] Furthermore, a second rubber outlet sleeve is provided at the outlet of the second extrusion channel, and the end of the second rubber outlet sleeve and the end of the first rubber outlet sleeve are flush with the end of the positioning tube.

[0009] Furthermore, the first rubber sleeve can rotate on the first sleeve; the first fitting groove is arranged in a spiral shape, and there are multiple first fitting grooves, and the multiple first fitting grooves are evenly distributed around the circumferential direction of the first rubber sleeve; the first fitting protrusion is arranged in a spiral shape, and there are multiple first fitting protrusions, and the multiple first fitting protrusions are evenly distributed around the circumferential direction of the first rubber sleeve, and each first fitting protrusion is arranged corresponding to a first fitting groove.

[0010] Furthermore, a control component is provided on the first sleeve, and the control component is a control board. A control program is provided on the control board. The control program on the control board can control the rotation speed of the first rubber sleeve, and the control program on the control board can control the speed at which the inner core moves in the positioning tube.

[0011] Furthermore, the extrusion molding device for foamed plastic products also includes a first power source, which is used to drive the first rubber output sleeve to rotate on the first sleeve; the first power source includes a first motor and a first ring gear, and a driving gear is fixedly arranged on the power output shaft of the first motor; the first ring gear is fixedly arranged on the first rubber output sleeve, and the first ring gear is always engaged with the driving gear; the control program on the control panel can control the rotation speed of the first motor.

[0012] Furthermore, the second rubber outlet sleeve is fixedly arranged on the second sleeve, and the first rubber outlet sleeve and the second rubber outlet sleeve are both arranged in a cylindrical shape.

[0013] Furthermore, the second rubber outlet sleeve can rotate on the second sleeve, the second rubber outlet sleeve and the first rubber outlet sleeve can rotate synchronously, and the second rubber outlet sleeve and the first rubber outlet sleeve are both configured to be truncated cone-shaped.

[0014] Furthermore, an outer side wall of one end of the positioning tube close to the first rubber outlet sleeve is configured as a conical surface.

[0015] Furthermore, a plurality of spiral second fitting grooves are arranged inside the second rubber outlet sleeve, and the plurality of second fitting grooves are evenly distributed around the circumference of the second rubber outlet sleeve, and each second fitting groove is arranged corresponding to a first fitting protrusion.

[0016] Furthermore, the extrusion molding device for foamed plastic products also includes a second power source, which is used to drive the second rubber output sleeve to rotate on the second sleeve; the second power source includes a second motor and a second ring gear, and a transmission gear is provided on the power output shaft of the second motor. The second ring gear is fixedly arranged on the second rubber output sleeve, and the transmission gear is always meshed with the second ring gear; the control program on the control panel can also control the rotation speed of the second motor.

[0017] The beneficial effects of the present invention are as follows: the extrusion molding device of the foamed plastic product of the present invention comprises an inner core, a positioning tube, a first sleeve, a second sleeve and a first rubber sleeve. When manufacturing a plastic fender, the inner core is conveyed and ensured to slide along the positioning tube, and the heated filling layer material is injected into the first extrusion channel, and the heated skin layer material is injected into the second extrusion channel, wherein the heated filling layer material can automatically expand when leaving the first extrusion channel, the heated skin layer material can cool after leaving the second extrusion channel, and the cooled skin layer material can expand in the filling layer. A protective film can be formed on the outside, and a first rubber sleeve is arranged at the outlet of the first extrusion channel, wherein the inner wall of the first rubber sleeve contacts the filling layer, and the outer wall of the first rubber sleeve contacts the epidermis layer. Under the action of the first fitting groove and the first fitting protrusion, a protrusion is formed on the outer surface of the expanded filling layer, and a groove can be formed on the inner surface of the epidermis layer after cooling. The automatic expansion of the filling layer can make the protrusion on its own outer surface enter the groove on the inner surface of the epidermis layer, thereby increasing the bonding effect between the filling layer and the epidermis layer, preventing stratification between the filling layer and the epidermis layer, and thereby increasing the overall protective effect of the plastic fender.

[0018] Furthermore, by using an extrusion molding device to process the plastic fender, the processing length can be customized according to actual needs, avoiding the truncation or splicing of the plastic fender at the actual construction site, and ensuring that the plastic fender has a good protective effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic structural diagram of an extrusion molding device for a foamed plastic product provided by an embodiment of the present invention;

[0021] Figure 2 A side view of a foamed plastic product extrusion molding device provided by an embodiment of the present invention when the second rubber outlet sleeve and the first rubber outlet sleeve are both cylindrical;

[0022] Figure 3 for Figure 2 Sectional view in the AA direction;

[0023] Figure 4 A side view of a foamed plastic product extrusion molding device provided by an embodiment of the present invention when the second rubber outlet sleeve and the first rubber outlet sleeve are both truncated cone-shaped;

[0024] Figure 5 for Figure 4 Cross-sectional view in the BB direction;

[0025] Figure 6 A schematic structural diagram of a first section of a first sleeve and a first rubber outlet sleeve in an extrusion molding device for a foamed plastic product provided in an embodiment of the present invention.

[0026] In the figure: 110, positioning tube; 120, inner core; 130, first sleeve; 140, first extrusion channel; 150, first extrusion outlet; 160, second sleeve; 170, second extrusion channel; 180, second extrusion outlet; 210, first rubber sleeve; 220, first fitting groove; 230, first fitting protrusion; 240, first gear ring; 310, second rubber sleeve; 410, first motor; 420, second motor; 430, second gear ring; 440, control board; 450, driving gear; 460, transmission gear. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0028] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is 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 a limitation to the present invention.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] like Figures 1 to 6 As shown, an extrusion molding device for a foamed plastic product provided by an embodiment of the present invention includes an inner core 120 , a positioning tube 110 , a first sleeve 130 , a second sleeve 160 and a first rubber outlet sleeve 210 .

[0031] The positioning tube 110 is coaxially sleeved on the outside of the inner core 120, and the inner core 120 can slide in the positioning tube 110 along its own axial direction. In this embodiment, a bracket is provided on the ground, and the positioning tube 110 is fixedly provided on the bracket. The bracket is provided with a conveying roller, and the conveying roller can convey the inner core 120 so that the inner core 120 can slide along its own axial direction, wherein the positioning tube 110 is sleeved on the outside of the inner core 120, and when the conveying roller conveys the inner core 120, the inner core 120 slides in the positioning tube 110.

[0032] The first sleeve 130 can form a first extrusion channel 140 with the positioning tube 110. In a specific setting, the first sleeve 130 is coaxially spaced and sleeved on the outside of the positioning tube 110, wherein in the moving direction of the inner core 120, the first sleeve 130 has a first front end located in front of the moving direction of the inner core 120 and a first rear end located in rear of the moving direction of the inner core 120, and the first rear end of the first sleeve 130 is sealed to the positioning tube 110 by a first sealing disk, and there is a gap between the first front end of the first sleeve 130 and the positioning tube 110. The side wall of the first sleeve 130 is provided with a first extrusion port 150 connecting the first extrusion channel 140 with the external environment, wherein the first extrusion port 150 is close to the first rear end of the first sleeve 130, and the heated filling layer material can enter the first extrusion channel 140 through the first extrusion port 150, and the heated filling layer material can flow in the first extrusion channel 140 in a preset direction, that is, after the heated filling layer material enters the first extrusion channel 140 through the first extrusion port 150, the flow direction of the heated filling layer material in the first extrusion channel 140 is the same as the moving direction of the inner core 120.

[0033] The second sleeve 160 can form a second extrusion channel 170 with the first sleeve 130. In a specific setting, the second sleeve 160 is coaxially spaced and sleeved on the outside of the first sleeve 130, wherein in the moving direction of the inner core 120, the second sleeve 160 has a second front end located in front of the moving direction of the inner core 120 and a second rear end located behind the moving direction of the inner core 120, and the second rear end of the second sleeve 160 is sealed to the first sleeve 130 by a second sealing disk, and there is a gap between the second front end of the second sleeve 160 and the first sleeve 130. The side wall of the second sleeve 160 is provided with a second extrusion port 180 connecting the second extrusion channel 170 with the external environment, wherein the second extrusion port 180 is close to the second rear end of the second sleeve 160, and the heated skin layer material can enter the second extrusion channel 170 through the second extrusion port 180, and the heated skin layer material can flow in the second extrusion channel 170 in a preset direction, that is, after the heated skin layer material enters the second extrusion channel 170 through the second extrusion port 180, the flow direction of the heated skin layer material in the second extrusion channel 170 is the same as the moving direction of the inner core 120.

[0034] The first rubber outlet sleeve 210 is arranged at the outlet of the first extrusion channel 140. In a specific setting, the first rubber outlet sleeve 210 is arranged at the first front end of the first sleeve 130. The inner wall of the first rubber outlet sleeve 210 is provided with a first fitting groove 220, and the outer wall of the first rubber outlet sleeve 210 is provided with a first fitting protrusion 230. When the heated filling layer material flows along the first extrusion channel 140 and the heated skin layer material flows along the second extrusion channel 170, the heated filling layer material separated from the first extrusion channel 140 can expand. Under the action of the first fitting groove 220, the outer wall of the expanded filling layer can form a protrusion. Under the action of the first fitting protrusion 230, the inner surface of the skin layer separated from the second extrusion channel 170 can form a groove. According to the setting of the first fitting groove 220 and the first fitting protrusion 230, the protrusion of the filling layer can enter the groove of the skin layer, thereby increasing the bonding effect between the filling layer and the skin layer.

[0035] The present invention discloses an extrusion molding device for a foamed plastic product. When manufacturing a plastic fender, the inner core 120 is conveyed and ensured to slide along the positioning tube 110. At the same time, the heated filling layer material is injected into the first extrusion channel 140, and the heated skin layer material is injected into the second extrusion channel 170. The heated filling layer material can automatically expand when it is separated from the first extrusion channel 140. The heated skin layer material can be cooled after it is separated from the second extrusion channel 170. The cooled skin layer material can form a protective film on the outside of the filling layer. A first rubber sleeve 210 is arranged at the outlet of the channel 140, wherein the inner wall of the first rubber sleeve 210 contacts the filling layer, and the outer wall of the first rubber sleeve 210 contacts the epidermis layer. Under the action of the first fitting groove 220 and the first fitting protrusion 230, a protrusion is formed on the outer surface of the expanded filling layer, and a groove is formed on the inner surface of the epidermis layer after cooling. Moreover, the automatic expansion of the filling layer can make the protrusion on its outer surface enter the groove on the inner surface of the epidermis layer, thereby increasing the bonding effect between the filling layer and the epidermis layer, preventing stratification between the filling layer and the epidermis layer, and further increasing the overall protective effect of the plastic fender.

[0036] In one embodiment, a second rubber sleeve 310 is provided at the outlet of the second extrusion channel 170, and the ends of the second rubber sleeve 310 and the first rubber sleeve 210 are flush with the end of the positioning tube 110. In a specific configuration, the second rubber sleeve 310 is provided at the second front end of the second sleeve 160, and the ends of the second rubber sleeve 310, the first rubber sleeve 210 and the positioning tube 110 are positioned to ensure that the filling layer and the skin layer can contact each other at a relatively high temperature, and at the same time, contact the inner core 120 at a relatively high temperature, thereby further preventing stratification between the filling layer and the skin layer, and preventing poor contact between the filling layer and the inner core 120.

[0037] In one embodiment, the first rubber sleeve 210 can rotate on the first sleeve 130. When the first rubber sleeve 210 rotates, the first rubber sleeve 210 can stir the heated filling layer material in the first extrusion channel 140, and at the same time, the first rubber sleeve 210 can stir the heated skin layer material in the second extrusion channel 170, ensuring that the heated filling layer material can expand evenly after leaving the first extrusion channel 140, so as to achieve uniform coating of the filling layer on the outside of the inner core 120. The first fitting groove 220 is set in a spiral shape, and there are a plurality of first fitting grooves 220, and the plurality of first fitting grooves 220 are evenly distributed around the circumference of the first rubber sleeve 210; the first fitting protrusion 230 is set in a spiral shape, and there are a plurality of first fitting protrusions 230, and the plurality of first fitting protrusions 230 are evenly distributed around the circumference of the first rubber sleeve 210, and each first fitting protrusion 230 is set corresponding to a first fitting groove 220. Specifically, by setting the first mating groove 220 and the first mating protrusion 230 to be spiral, the protrusion on the outer surface of the expanded filling layer is spiral, and the groove on the inner surface of the epidermis layer is spiral. By setting it to be spiral, the circumferential bonding effect between the filling layer and the epidermis layer is increased.

[0038] In one embodiment, a control component is provided on the first sleeve 130, and the control component is used to control the rotation speed of the first rubber sleeve 210, and the control component can control the speed at which the inner core 120 moves in the positioning tube 110. In this embodiment, the control component is a control panel 440, and a control program is provided on the control panel 440. The control program on the control panel 440 controls the rotation speed of the first rubber sleeve 210 to match the speed at which the inner core 120 moves in the positioning tube 110, thereby preventing the first fitting protrusion 230 on the outer wall of the first rubber sleeve 210 from stirring the epidermis layer, thereby ensuring that the protrusions on the outer surface of the filling layer and the grooves on the inner surface of the epidermis layer are both regular.

[0039] In one embodiment, the extrusion molding device of the foamed plastic product further includes a first power source, which is used to drive the first rubber sleeve 210 to rotate on the first sleeve 130, and the control member can control the first power source. In this embodiment, the first power source includes a first motor 410 and a first gear ring 240, the first motor 410 is fixedly arranged on the bracket, and a driving gear 450 is fixedly arranged on the power output shaft of the first motor 410. The first gear ring 240 is fixedly arranged on the first rubber sleeve 210, and the first gear ring 240 is always meshed with the driving gear 450, wherein the heated epidermal layer material entering the second extrusion channel 170 does not affect the meshing of the first gear ring 240 and the driving gear 450, and does not affect the rotation of the driving gear 450, ensuring that the first motor 410 can drive the rotation of the first rubber sleeve 210 through the transmission of the driving gear 450 and the first gear ring 240. Furthermore, the control program on the control board 440 is used to control the first motor 410 , that is, the rotation speed of the driving gear 450 driven by the first motor 410 can be controlled.

[0040] In one embodiment, the second rubber sleeve 310 is fixedly disposed on the second sleeve 160, and the first rubber sleeve 210 and the second rubber sleeve 310 are both configured as cylindrical shapes. By configuring the shapes of the first rubber sleeve 210 and the second rubber sleeve 310, it is ensured that the surface of the epidermis is smooth after exiting the second extrusion channel 170.

[0041] In another embodiment, the second rubber sleeve 310 can rotate on the second sleeve 160, and the second rubber sleeve 310 and the first rubber sleeve 210 can rotate synchronously. The second rubber sleeve 310 can stir the epidermis in the second extrusion channel 170 when rotating. When the second rubber sleeve 310 and the first rubber sleeve 210 rotate synchronously, the heated epidermis material in the second extrusion channel 170 can maintain a uniformly mixed state. The second rubber sleeve 310 and the first rubber sleeve 210 are both configured to be truncated cone-shaped. In a specific configuration, the end of the first rubber sleeve 210 with a smaller diameter is located at the front side of the movement direction of the inner core 120, and the end of the second rubber sleeve 310 with a smaller diameter is located at the front side of the movement direction of the inner core 120. By configuring the second rubber sleeve 310 and the first rubber sleeve 210 to be truncated cone-shaped, the filling layer discharged from the first extrusion channel 140 can be closer to the inner core 120, and the heated filling layer material can fully contact the inner core 120 after expansion. The skin layer discharged from the second extrusion channel 170 can be closer to the inner core 120 , and the heated filling layer material can squeeze the skin layer after expansion, so that the skin layer can expand, further increasing the bonding effect between the skin layer and the filling layer.

[0042] In one embodiment, the outer wall of one end of the positioning tube 110 close to the first rubber sleeve 210 is set as a cone to prevent the outer wall of the positioning tube 110 from affecting the contact between the filling layer and the inner core 120, so that the filling layer can be smoothly discharged from the first extrusion channel 140.

[0043] In one embodiment, a plurality of spiral second fitting grooves are arranged inside the second rubber outlet sleeve 310, and the plurality of second fitting grooves are evenly distributed around the circumference of the second rubber outlet sleeve 310, and each second fitting groove is arranged corresponding to a first fitting protrusion 230. By providing the second fitting grooves, when the heated epidermis material comes out of the second extrusion channel 170, the surface of the epidermis is spirally wrinkled, and in this state, the expansion of the filling layer can expand the wrinkled epidermis, preventing the unwrinkled epidermis from rupturing when the filling layer expands.

[0044] In one embodiment, the extrusion molding device of the foamed plastic product further includes a second power source, which is used to drive the second rubber sleeve 310 to rotate on the second sleeve 160, and the control member can control the second power source. In a specific setting, the second power source includes a second motor 420 and a second gear ring 430, the second motor 420 is fixedly arranged on the bracket, a transmission gear 460 is arranged on the power output shaft of the second motor 420, the second gear ring 430 is fixedly arranged on the second rubber sleeve 310, and the transmission gear 460 is always meshed with the second gear ring 430. When the second motor 420 is started, the second rubber sleeve 310 is rotated through the transmission of the transmission gear 460 and the second gear ring 430. The control program on the control board 440 is used to control the second motor 420, that is, the rotation speed of the second motor 420 driving the transmission gear 460 can be controlled.

[0045] In one embodiment, the first sleeve 130 is divided into a first section and a second section, the first section is coaxially rotatably connected to the second section, the first section is located at the front side of the movement direction of the inner core 120, and the second section is located at the rear side of the movement direction of the inner core 120, the first rubber outlet sleeve 210 is fixedly connected to the end of the first section, the first ring gear 240 is fixedly arranged in the first section of the first sleeve 130, and the first motor 410 is driven by the driving gear 450 and the first ring gear 240, so that the first sleeve 130 and the first rubber outlet sleeve 210 rotate synchronously, ensuring that the heated filling layer material can be fully stirred in the first extrusion channel 140.

[0046] In one embodiment, the second rubber outlet sleeve 310 is fixedly connected to the second sleeve 160, the second gear ring 430 is fixedly arranged on the second sleeve 160, the transmission gear 460 is always meshed with the second gear ring 430, and when the second motor 420 is started, the second rubber outlet sleeve 310 and the second sleeve 160 rotate synchronously through the transmission of the transmission gear 460 and the second gear ring 430, ensuring that the heated epidermal layer material can be fully stirred in the second extrusion channel 170.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An extrusion molding device for foamed plastic products, characterized in that: include: Inner core; A positioning tube, which is coaxially sleeved on the outside of the inner core, and the inner core can slide along its own axis in the positioning tube; A first sleeve, wherein the first sleeve and the positioning tube can form a first extrusion channel, and the heated filling layer material can flow in a preset direction in the first extrusion channel; A second sleeve, the second sleeve can form a second extrusion channel with the first sleeve, and the heated skin layer material can flow in a preset direction in the second extrusion channel; The first rubber sleeve is arranged at the outlet of the first extrusion channel, the first rubber sleeve is provided with a first fitting groove on the inner side wall, the first rubber sleeve is provided with a first fitting protrusion on the outer side wall, and the second rubber sleeve is provided at the outlet of the second extrusion channel, the end of the second rubber sleeve and the end of the first rubber sleeve are flush with the end of the positioning tube, and the first rubber sleeve can rotate on the first sleeve; the first fitting groove is arranged in a spiral shape, and there are multiple first fitting grooves, and the multiple first fitting grooves are evenly distributed around the circumferential direction of the first rubber sleeve; the first fitting protrusion is arranged in a spiral shape, and there are multiple first fitting protrusions, and the multiple first fitting protrusions are evenly distributed around the circumferential direction of the first rubber sleeve, each first fitting protrusion is arranged corresponding to a first fitting groove, and the second rubber sleeve The second rubber sleeve is fixedly arranged on the second sleeve, the first rubber sleeve and the second rubber sleeve are both arranged in a cylindrical shape, the second rubber sleeve can rotate on the second sleeve, the second rubber sleeve and the first rubber sleeve can rotate synchronously, the second rubber sleeve and the first rubber sleeve are both arranged in a truncated cone shape, a plurality of spiral second fitting grooves are arranged inside the second rubber sleeve, the plurality of second fitting grooves are evenly distributed around the circumferential direction of the second rubber sleeve, and each second fitting groove is arranged corresponding to a first fitting protrusion; when the heated filling layer material flows along the first extrusion channel and the heated epidermal layer material flows along the second extrusion channel, the heated filling layer material that is separated from the first extrusion channel can expand, and under the action of the first fitting groove, the outer side wall of the expanded filling layer can form a protrusion Under the action of the first mating protrusion, a groove can be formed on the inner surface of the epidermis layer separated from the second extrusion channel, so that the protrusion of the filling layer can enter the groove of the epidermis layer, thereby increasing the bonding effect between the filling layer and the epidermis layer; at the same time, when the heated epidermis layer material comes out of the second extrusion channel, spiral wrinkles occur on the surface of the epidermis layer, and the expansion of the filling layer can expand the wrinkled epidermis layer, preventing the unwrinkled epidermis layer from rupturing when the filling layer expands. A control member is provided on the first sleeve, and the control member is a control board. A control program is provided on the control board. The control program on the control board can control the rotation speed of the first rubber sleeve, and the control program on the control board can control the speed at which the inner core moves in the positioning tube. The foamed plastic product The extrusion molding device also includes a first power source, which is used to drive the first rubber sleeve to rotate on the first sleeve; the first power source includes a first motor and a first gear ring, and a driving gear is fixedly arranged on the power output shaft of the first motor; the first gear ring is fixedly arranged on the first rubber sleeve, and the first gear ring is always meshed with the driving gear; the control program on the control board can control the rotation speed of the first motor, and the extrusion molding device of the foamed plastic product also includes a second power source, which is used to drive the second rubber sleeve to rotate on the second sleeve; the second power source includes a second motor and a second gear ring, and a transmission gear is arranged on the power output shaft of the second motor, and the second gear ring is fixedly arranged on the second rubber sleeve, and the transmission gear is always meshed with the second gear ring;The control program on the control board can also control the speed of the second motor. When the first rubber sleeve rotates, the first rubber sleeve can stir the heated filling layer material in the first extrusion channel, and at the same time, the first rubber sleeve can stir the heated skin layer material in the second extrusion channel; when the second rubber sleeve rotates, it can stir the skin layer in the second extrusion channel. When the second rubber sleeve rotates synchronously with the first rubber sleeve, the heated skin layer material in the second extrusion channel can maintain a uniformly mixed state.

2. The extrusion molding device for a foamed plastic product according to claim 1, characterized in that: The outer side wall of one end of the positioning tube close to the first rubber outlet sleeve is arranged as a conical surface.

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