A bamboo-like plastic extrusion product processing device and processing method

Abstract

The application discloses a bamboo-shaped plastic extrusion product processing device and a processing method. The processing device comprises an extrusion die, a node forming die, a cooling and shaping die, a driving device and a guide device. The processing method comprises the following steps: continuously extruding a tubular parison with a certain temperature and plasticity from the extrusion die under the action of traction; driving the node forming die to form a block to the outer surface of the plastic tubular parison in the upstream according to a certain time interval, so that the surface of the tubular parison is raised, and a node is formed at the specified position of the tubular parison, and finally a bamboo-shaped plastic extrusion product with a node at the specified position is obtained. The application effectively solves the problem that the bamboo-shaped product cannot be continuously processed, and greatly improves the texture and reality of the bamboo-shaped extrusion product.

Description

Technical Field

[0001] This invention belongs to the field of plastic extrusion product manufacturing technology, specifically relating to a bamboo-shaped plastic extrusion product processing device and processing method. Background Technology

[0002] Extrusion molding is one of the main methods for efficient polymer molding, known for its continuous production, consistent cross-section, high efficiency, high added value, low cost, and large-volume production. It is widely used in the production of pipes, sheets, and profiles. An extrusion molding production line mainly includes a screw extruder, extrusion molds, cooling and shaping devices, traction devices, and cutting devices.

[0003] Plastic extruded products typically have a high degree of cross-sectional uniformity. To obtain personalized products, secondary molding or processing of the extruded products is usually required. A typical secondary molding process is extrusion blow molding, which uses a semi-molten tubular preform obtained from extrusion molding for blow molding. A typical secondary processing method is the threading method, used to form a threaded tube on the plastic straw body (ZL201410704638.3). Both secondary molding and secondary processing are discontinuous processes, leading to increased production costs and reduced production efficiency. Existing methods for manufacturing simulated bamboo include: injection molding followed by splicing (ZL201920749539.5, ZL202122146121.5, and ZL201920782560.5), bamboo joint forming machines (ZL201510954962.5), aluminum alloy bamboo (ZL201811310231.7), polishing and painting of real bamboo poles, etc. There is currently no method for continuously processing bamboo-shaped plastic extrusions. Summary of the Invention

[0004] Technical problem to be solved: In view of the above-mentioned technical problems, the present invention provides a processing device and method for bamboo-shaped plastic extrusion products, which can effectively solve the problem that existing bamboo-shaped products cannot be processed continuously.

[0005] Technical solution: In a first aspect, the present invention provides a processing apparatus for bamboo-shaped plastic extrusion products, including an extrusion die, a bamboo-joint forming die, a cooling and shaping die, a driving device, and a guiding device.

[0006] The extrusion mold includes a die and a core, with the die fitted over the core. The bamboo-joint forming mold includes a forming mold body, a bamboo-joint forming part, a linear flange bearing, a temperature control device, a bracket, and a first mounting base. The forming mold body is annular, with the linear flange bearing positioned on the first end face of the forming mold body. The bamboo-joint forming part is a concentric stepped hole, located on the inner ring of the second end face of the forming mold body. The temperature control device is positioned in the outer groove of the bamboo-joint forming part. Two brackets are symmetrically positioned on the sides of the forming mold body, and the first mounting base is mounted on the brackets. The cooling and shaping mold includes a front part and a rear part. The first end face of the rear part of the mold has an annular groove, and the front part of the mold has an opening at the annular groove, forming an annular cooling channel. A second mounting plate is positioned on the side of the cooling and shaping mold. The extrusion mold is connected to the forming mold body via a guide device. The fixed end of the driving device is positioned on the second mounting plate, and the driving end is connected to the first mounting base.

[0007] Preferably, the exit end face of the core is 0-50 mm higher than the end face of the die.

[0008] Preferably, the guiding device is a guide post, one end of which is disposed in a fixing hole on the die, and the other end is connected to the forming die body through a linear flange bearing.

[0009] Preferably, the driving device is a cylinder or a servo electric cylinder.

[0010] Preferably, the cooling and shaping mold is either integral or split.

[0011] Preferably, the temperature control device is a heating device or a cooling device.

[0012] Preferably, the mold has a cooling medium inlet and a cooling medium outlet at the rear.

[0013] Preferably, the cooling and shaping mold further includes a sealing device, which is a perforated flange rubber gasket or an O-ring. The sealing device is disposed in the grooves on both sides of the annular cooling channel or at the interface between the front and rear of the mold.

[0014] Secondly, the present invention provides a method for processing bamboo-shaped plastic extrusion products, comprising the following steps:

[0015] S1. Tube blank extrusion: Under traction, the raw material is continuously extruded from the extrusion die to obtain a tube blank with a certain temperature and plasticity;

[0016] S2. Bamboo joint forming: According to the set time interval T, the driving device drives the bamboo joint forming mold to make linear reciprocating motion, so that it forms a block on the outer surface of the upstream tube blank, thereby causing the surface of the tube blank to bulge and forming bamboo joints at the designated position of the tube blank. During the bamboo joint forming process, the time interval T is dynamically adjusted so that the bamboo joints are evenly or non-uniformly distributed along the extrusion direction.

[0017] S3. Cooling and Shaping: The tube blank with bamboo joints is cooled and shaped in a cooling and shaping mold, and then cut to obtain bamboo-shaped plastic extrusion products.

[0018] Preferably, in step S1, the raw material is PMMA, PC, PVC, PP or PE, the traction speed is 1-50 mm / s, and the traction ratio is 1.05~4.0.

[0019] Preferably, in step S2, the time interval T is 2~500s, and the linear reciprocating motion includes feeding motion, forming motion and return motion; the bamboo joints are evenly distributed along the extrusion direction or exhibit a repetitive change from small to large.

[0020] Preferably, in step S3, the number of cooling and shaping molds is 1 to 10, the cooling medium is cooling water, cooling air or cooling oil, and the resulting bamboo-shaped plastic extrusion product has an outer diameter of 10 to 150 mm, a wall thickness of 1 to 10 mm, a wall thickness of 2 to 12 mm at the bamboo nodes, and a bamboo node spacing of 10 to 1000 mm.

[0021] Beneficial effects: The present invention provides a bamboo-shaped plastic extrusion product processing device and processing method, which effectively solves the problem of the inability to continuously process bamboo-shaped products; the bamboo-shaped extrusion products of the present invention have bamboo joints, which greatly improves the texture and realism of the bamboo-shaped extrusion products. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the bamboo-shaped plastic extrusion product of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the bamboo-shaped plastic extrusion product processing device of the present invention;

[0024] Figure 3 This is a schematic diagram of the extrusion die structure in the processing device of the present invention;

[0025] Figure 4 These are the front and rear views of the bamboo joint forming mold in the processing device of this invention;

[0026] Figure 5 These are the front view and cross-sectional view of the cooling and shaping mold in the processing device of the present invention;

[0027] The numbers in the diagram are as follows: 100, bamboo-shaped plastic extrusion product; 110, tube blank; 120, bamboo joint; 200, extrusion die; 210, die mouth; 211, fixing hole; 212, first countersunk hole; 220, core; 300, bamboo joint forming die; 310, forming die body; 311, bamboo joint forming part; 320, linear flange bearing; 330, temperature control device; 340, bracket; 350, first mounting base; 400, cooling and shaping die; 410, front part of die; 420, rear part of die; 421, cooling medium inlet; 422, cooling medium outlet; 423, second countersunk hole; 430, second mounting plate; 440, annular cooling channel; 450, sealing device; 500, driving device; 600, guiding device. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0029] Example 1

[0030] like Figure 1 As shown, a bamboo-shaped plastic extrusion product 100 is made of PMMA. A tube blank 110 is obtained by extrusion molding. At a designated position along the length of the tube blank 110, a ring-shaped protrusion of bamboo joint 120 is formed on the outer circumferential surface. The outer diameter of the tube blank 110 is 78 mm, the wall thickness is 5 mm, the maximum outer diameter of the bamboo joint 120 is 80 mm, and the spacing between the bamboo joints is 300 mm.

[0031] Example 2

[0032] like Figures 2-5 As shown, a bamboo-shaped plastic extrusion product processing device includes an extrusion die 200, a bamboo-joint forming die 300, a cooling and shaping die 400, a driving device 500, and a guiding device 600.

[0033] The extrusion die 200 includes a die 210 that forms the outer wall of the tube blank 110 and a core 220 that forms the inner wall of the tube blank 110. The outlet end face of the core 220 is 5mm higher than the end face of the die 210. The die 210 is fitted over the core 220. The die 210 has a fixing hole 211 for installing a guide device 600. The two are in transition fit. The die 210 has a first countersunk hole 212 for connecting the extrusion die 200 and the extruder head (not shown).

[0034] The bamboo joint forming mold 300 includes a forming mold body 310, a bamboo joint forming part 311, a linear flange bearing 320, a temperature control device 330, a bracket 340, and a first mounting base 350. The forming mold body 310 is annular. The linear flange bearing 320 is disposed on the first end face of the forming mold body 310. The bamboo joint forming part 311 has concentric stepped holes and is disposed on the inner ring of the second end face of the forming mold body 310. The temperature control device 330 is an electric heating device and is disposed in the outer groove of the bamboo joint forming part 311. Two brackets 340 are symmetrically disposed on the side of the forming mold body 310. The first mounting base 350 is disposed on the bracket 340.

[0035] The cooling and shaping mold 400 includes a front part 410 and a rear part 420. The first end face of the rear part 420 is provided with an annular groove. The front part 410 is provided at the opening end of the annular groove so that the annular groove forms an annular cooling channel 440. The side of the cooling and shaping mold 400 is provided with a second mounting plate 430. The cooling and shaping mold 400 is a split type, and there are two of them. The rear part 420 is provided with a second countersunk hole 423 for connecting the front part 410 and the rear part 420.

[0036] The extrusion die 200 is connected to the forming die body 310 via the guide device 600. The fixed end of the driving device 500 is mounted on the second mounting plate 430, and the driving end is connected to the first mounting base 350. The extrusion die 200, the bamboo joint forming die 300, and the cooling and shaping die 400 are coaxially arranged.

[0037] The guide device 600 is a guide post. One end of the guide post is fixed in the fixing hole 211 of the die 210 by bolts, and the other end is inserted into the inner hole of the linear flange bearing 320.

[0038] The drive device 500 is a cylinder, controlled by a PLC to obtain the desired speed curve.

[0039] The rear part 420 of the mold has a cooling medium inlet 421 and a cooling medium outlet 422.

[0040] The cooling and shaping mold 400 also includes a sealing device 450, which is an O-ring and is disposed in the grooves on both sides of the annular cooling channel 440.

[0041] Example 3

[0042] A method for processing bamboo-shaped plastic extrusion products includes the following steps:

[0043] S1. Tube blank extrusion: Under traction, the raw material PMMA is continuously extruded from the slit between the die 210 and the core 220 to obtain a tube blank 110 with a certain temperature and plasticity. The traction speed is 15 mm / s and the traction ratio is 1.1.

[0044] S2. Bamboo joint forming: According to the set time interval T=20s, two cylinders drive the bamboo joint forming mold 300 to make linear reciprocating motion, which hinders the flow of upstream PMMA melt, thereby causing the surface of tube blank 110 to bulge and forming bamboo joint 120 at a designated position in the length direction of tube blank 110. The spacing between bamboo joints is 300mm. The temperature control device 330 is a heating wire, which is set in the groove around the bamboo joint forming part 320, and the heating temperature is 120℃.

[0045] S3. Cooling and shaping: The tube blank 110 with bamboo joints 120 is cooled and shaped in two separate cooling and shaping molds 400. The cooling medium is cooling water at 22~28℃. The cooling water flows in from the cooling medium inlet 421 and flows out from the cooling medium outlet 422. After cutting, the bamboo-shaped plastic extrusion product 100 is obtained.

[0046] The processing device of this invention can continuously and efficiently manufacture bamboo-shaped plastic extrusion products under the action of the traction device, effectively solving the problem that bamboo-shaped products cannot be processed continuously; the resulting bamboo-shaped extrusion products have bamboo joints, which greatly improves the texture and realism of the bamboo-shaped extrusion products.

[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, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A processing device for bamboo-shaped plastic extrusion products, characterized in that: It includes an extrusion die (200), a bamboo-shaped die (300), a cooling and shaping die (400), a drive device (500), and a guide device (600). The extrusion die (200) includes a die (210) and a core (220), wherein the die (210) is fitted over the core (220). The bamboo joint forming mold (300) includes a forming mold body (310), a bamboo joint forming part (311), a linear flange bearing (320), a temperature control device (330), a bracket (340), and a first mounting seat (350). The forming mold body (310) is annular. The linear flange bearing (320) is disposed on the first end face of the forming mold body (310). The bamboo joint forming part (311) is a concentric stepped hole. The bamboo joint forming part (311) is disposed on the inner ring of the second end face of the forming mold body (310). The temperature control device (330) is disposed in the outer groove of the bamboo joint forming part (311). Two brackets (340) are symmetrically disposed on the side of the forming mold body (310). The first mounting seat (350) is disposed on the bracket (340). The cooling and shaping mold (400) includes a front part (410) and a rear part (420). The first end face of the rear part (420) is provided with an annular groove. The front part (410) is provided at the opening end of the annular groove so that the annular groove forms an annular cooling channel (440). The side of the cooling and shaping mold (400) is provided with a second mounting plate (430). The extrusion die (200) is connected to the forming die body (310) via a guide device (600), and the fixed end of the driving device (500) is set on the second mounting plate (430), and the driving end is connected to the first mounting base (350). Under traction, the raw material is continuously extruded from the extrusion die (200) to obtain a tube blank (110) with a certain temperature and plasticity; then, according to the set time interval T, the driving device (500) drives the bamboo joint forming die (300) to make linear reciprocating motion, so that it forms a block on the outer surface of the upstream tube blank (110), thereby causing the surface of the tube blank (110) to bulge and form a bamboo joint (120) at the designated position of the tube blank (110).

2. The bamboo-shaped plastic extrusion product processing device according to claim 1, characterized in that: The exit end face of the core (220) is 0~50 mm higher than the end face of the die (210).

3. The bamboo-shaped plastic extrusion product processing device according to claim 1, characterized in that: The guiding device (600) is a guide post. One end of the guide post is set in the fixing hole (211) on the die (210), and the other end is connected to the forming die body (310) through a linear flange bearing (320).

4. The bamboo-shaped plastic extrusion product processing device according to claim 1, characterized in that: The driving device (500) is a cylinder or a servo electric cylinder; the cooling and shaping mold (400) is an integral type or a split type; the temperature control device (330) is a heating device or a cooling device.

5. The bamboo-shaped plastic extrusion product processing device according to claim 1, characterized in that: The rear part (420) of the mold is provided with a cooling medium inlet (421) and a cooling medium outlet (422).

6. The bamboo-shaped plastic extrusion product processing device according to claim 1, characterized in that: The cooling and shaping mold (400) also includes a sealing device (450), which is a perforated flange rubber gasket or an O-ring. The sealing device (450) is set in the grooves on both sides of the annular cooling channel (440) or at the interface between the front part (410) and the rear part (420) of the mold.

7. A processing method for producing bamboo-shaped plastic extruded products using the processing apparatus according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Tube blank extrusion: Under traction, the raw material is continuously extruded from the extrusion die (200) to obtain a tube blank (110) with a certain temperature and plasticity. S2, Bamboo Joint Forming: According to the set time interval T, the driving device (500) drives the bamboo joint forming mold (300) to make a linear reciprocating motion, so that it forms a block on the outer surface of the upstream tube blank (110), thereby causing the surface of the tube blank (110) to bulge and form bamboo joints (120) at the designated position of the tube blank (110). During the bamboo joint forming process, the time interval T is dynamically adjusted so that the bamboo joints (120) are evenly or non-uniformly distributed along the extrusion direction. S3, Cooling and Shaping: The tube blank (110) with bamboo joints (120) is cooled and shaped in the cooling and shaping mold (400), and then cut to obtain bamboo-shaped plastic extrusion products (100).

8. The processing method according to claim 7, characterized in that: In step S1, the raw materials are PMMA, PC, PVC, PP or PE, the traction speed is 1-50 mm / s, and the traction ratio is 1.05~4.

0.

9. The processing method according to claim 7, characterized in that: In step S2, the time interval T is 2~500s, and the linear reciprocating motion includes feeding motion, forming motion and return motion; the bamboo sections are evenly distributed along the extrusion direction or exhibit repeated changes from small to large.

10. The processing method according to claim 7, characterized in that: In step S3, the number of cooling and shaping molds (400) is 1 to 10, the cooling medium is cooling water, cooling air or cooling oil, and the bamboo-shaped plastic extrusion product (100) has an outer diameter of 10 to 150 mm, a wall thickness of 1 to 10 mm, a wall thickness of 2 to 12 mm at the bamboo joint, and a spacing of 10 to 1000 mm between the bamboo joints (120).

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