Extruder for producing a tube without adhesive bead

Abstract

This utility model relates to the field of plastic pipe manufacturing technology, specifically an extruder for producing non-bonded tubing. It includes a frame and an extruder barrel. The extruder barrel is fixedly mounted on the upper end of the frame, and a feed inlet is installed on the upper end of the extruder barrel. A double-layer screw mechanism is installed inside the extruder barrel, and a gearbox is installed on the lower right end of the extruder barrel. A drive mechanism is installed inside the gearbox. The double-layer screw mechanism of this utility model eliminates the need for a rotating screw core; only the screw groove layer rotates to transport the raw material. The screw core connects to the die core. The die eliminates the need for a cutter foot and a spiral hole support, and the material preform is not divided and then bonded. This eliminates the bonding line in the plastic pipe, improves the pressure resistance, reduces the risk of cracking and leakage along the bonding line in the finished pipe, solves the problem of frictional heat generation of heat-sensitive materials passing through the cutter foot, avoids decomposition of the raw material, and improves product quality.

Description

Technical Field

[0001] This utility model relates to the field of plastic pipe production technology, specifically to an extruder for producing non-woven tubing. Background Technology

[0002] Extrusion molding of plastic products is a relatively mature molding process in plastic processing. The process involves adding powdered or granular plastic resin raw materials into the barrel of an extruder. Under the rotation and pushing of the screw, the raw materials are melted and plasticized under high temperature and high pressure conditions. Then, the continuously rotating screw pushes the molten material into the die head mold, and the plastic products are extruded from the die head mold. After shaping and cutting, the products are made into the required specifications.

[0003] like Figure 1 and Figure 2 As shown, existing plastic pipe molds all use spiral supports or cutter foot supports to support the mandrel. The mandrel is the main functional mold component that forms the hollow cavity of the plastic pipe. After the plasticized molten preform is extruded from the extruder, it passes through the mandrel to form a hollow cavity. The preform is cut and separated as it passes through the support, such as... Figure 3 As shown, after passing through the support, the preform is compressed and bonded together. This bonding line is known in the industry as the bonding line. Due to the compression ratio of the mold design or the adhesive properties of the material itself, the bonding strength at the bonding line is sometimes lower than the strength of the preform. This can cause the tube to crack along the bonding line when transporting high-pressure media, potentially leading to leakage. For heat-sensitive materials, the friction during passage through the die holder can cause them to decompose, making processing difficult. To address this issue, we propose an extruder for producing tubes without a bonding line. Summary of the Invention

[0004] The purpose of this invention is to provide an extruder for producing non-bonded tubing, thereby solving the problem mentioned in the background art where, when conveying high-pressure media, the tubing may crack along the bonded line, causing leakage of the media. For heat-sensitive materials, the friction during passage through the die holder can cause them to decompose, making processing and molding these materials difficult.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an extruder for producing non-adhesive tubing, comprising a frame and an extruder barrel, wherein the extruder barrel is fixedly installed at the upper end of the frame, a feed port is installed at the upper end of the extruder barrel, a double-layer screw mechanism is provided inside the extruder barrel, a gearbox is installed at the lower right end of the extruder barrel, and a drive mechanism is provided inside the gearbox;

[0006] The double-layer screw mechanism includes a screw core, a screw groove layer, and a bolt hole. The screw core is provided inside the extruder barrel, the screw groove layer is provided outside the screw core, and a bolt hole is provided on the left side of the screw core.

[0007] Preferably, the drive mechanism includes a servo motor, a drive gear, a timing belt, and a driven gear. The servo motor is mounted on the left end of the gearbox, the drive gear is fixedly connected to the right output end of the servo motor, the timing belt is movably connected to the outer surface of the drive gear, the driven gear is connected to the outer side of the screw groove layer, and the other end of the timing belt is movably connected to the driven gear.

[0008] Preferably, a screw core is connected inside the screw groove layer, and a high-temperature bearing is provided between the screw groove layer and the screw core.

[0009] Preferably, a bladeless corner frame mold is provided at the left end of the extruder barrel. The bladeless corner frame mold includes a rear mold body, a rear mandrel, a connecting bolt, a middle mold body, a first screw, a die plate, a second screw, a die head, a front mandrel, and a wall thickness adjustment screw. The rear mold body is provided at the left end of the extruder barrel and is connected to the extruder barrel by a connecting clamp. A rear mandrel is installed at the center of the rear mold body, and a connecting bolt is installed inside the rear mandrel. The connecting bolt is adapted to the bolt hole. A middle mold body is provided on the left side of the rear mold body and is connected to the rear mold body by the first screw. A die plate is provided on the left side of the middle mold body and is connected to the middle mold body by the second screw. A die head is installed on the left side of the die plate. A front mandrel is installed on the left side of the rear mandrel. A wall thickness adjustment screw is connected to the outer surface of the die plate.

[0010] Preferably, a positioning assembly is provided on the outer side of the gearbox. The positioning assembly includes a reinforcing plate, a first bolt, and a second bolt. A reinforcing plate is provided on the right side of the gearbox. Four sets of first bolts are connected to the four corners of the reinforcing plate. A second bolt is connected to the center of the reinforcing plate. The end of the second bolt is connected to the right end of the screw core.

[0011] Preferably, the outer surface of the extruder barrel is provided with three sets of cooling components. The cooling components include cooling pipes, flow channels, centrifugal fans, heat dissipation holes, and dustproof nets. The outer surface of the extruder barrel is connected to the three sets of cooling pipes. The interior of the cooling pipes is provided with flow channels. A centrifugal fan is installed at the rear end of the cooling pipes. The centrifugal fan is connected to the interior of the flow channels. Heat dissipation holes are equidistantly opened on the outer surface of the cooling pipes. Dustproof nets are connected to the openings of the heat dissipation holes.

[0012] Preferably, the inner wall of the cooling pipe in contact with the extruder barrel is made of copper.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention utilizes a double-layer screw mechanism where the screw core does not rotate; only the screw groove layer rotates to transport the raw material. The screw core connects to the core mold, while the outer mold is connected to the extruder barrel in the same way as a traditional mold. The mold eliminates the need for cutter feet and spiral hole supports, and the material preform is no longer segmented and then bonded. This eliminates the bonding line in the plastic pipe, improves the pressure resistance, reduces the risk of cracking and leakage along the bonding line in the finished pipe, and solves the problem of frictional heat generation of heat-sensitive materials passing through the cutter feet, preventing the decomposition of the raw material and improving product quality. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of an existing plastic pipe mold;

[0017] Figure 2 A schematic diagram of the cutter head mold for existing plastic pipe molds;

[0018] Figure 3 A schematic diagram showing the plasticized raw materials being segmented and re-fused via a cutter holder;

[0019] Figure 4 This is a front sectional view of the structure of this utility model;

[0020] Figure 5 This utility model Figure 1 A schematic cross-sectional view of the structure of the extruder barrel;

[0021] Figure 6 This is a schematic diagram of the structure of the double-layer screw mechanism of this utility model;

[0022] Figure 7 This is a schematic diagram of the structure of the bladeless corner bracket mold of this utility model;

[0023] Figure 8 This is a structural schematic diagram of the cooling component of this utility model.

[0024] In the diagram: 1. Frame; 2. Extruder barrel; 3. Feed inlet; 4. Double-layer screw mechanism; 401. Screw core; 402. Screw groove layer; 403. Bolt hole; 5. Gearbox; 6. Drive mechanism; 601. Servo motor; 602. Drive gear; 603. Synchronous belt; 604. Driven gear; 7. Knifeless angle frame mold; 701. Rear mold body; 702. Rear mandrel; 703. Connecting bolt; 704. Middle mold 705. Body; 706. First screw; 707. Die plate; 708. Die head; 709. Front mandrel; 710. Wall thickness adjustment screw; 8. Positioning assembly; 801. Reinforcing plate; 802. First bolt; 803. Second bolt; 9. Cooling assembly; 901. Cooling pipe; 902. Flow channel; 903. Centrifugal fan; 904. Heat dissipation hole; 905. Dustproof net; 10. Connecting clamp. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 4-8 This utility model provides an embodiment of an extruder for producing non-adhesive tubing, comprising a frame 1 and an extruder barrel 2. The extruder barrel 2 is fixedly mounted on the upper end of the frame 1, and a feed inlet 3 is installed on the upper end of the extruder barrel 2. A double-layer screw mechanism 4 is provided inside the extruder barrel 2, and a gearbox 5 is installed on the lower right end of the extruder barrel 2. A drive mechanism 6 is provided inside the gearbox 5. The double-layer screw mechanism 4 includes a screw core 401, a screw groove layer 402, and a bolt hole 403. The extruder barrel 2 is provided with... The screw core 401 has a screw groove layer 402 on its outer side, and a bolt hole 403 is opened on the left side of the screw core 401. The raw material is poured into the extruder barrel 2 from the feed port 3, and then the drive mechanism 6 is started to drive the double-layer screw mechanism 4. The raw material is preheated, plasticized and homogenized and extruded into the bladeless corner frame mold 7. The plasticized raw material is formed into a tubular blank or profile blank through the bladeless corner frame mold 7. The blank without the bonding line enters the subsequent shaping, cooling and traction cutting production line for processing into tubes or profiles.

[0027] This device, through the setup of a double-layer screw mechanism 4 and a bladeless angle holder mold 7, solves the problem of pipes cracking along the bonding line when transporting high-pressure media, potentially causing media leakage from this point. For heat-sensitive materials, the friction encountered when passing through the blade holder can cause them to decompose, making processing and molding difficult.

[0028] Furthermore, the drive mechanism 6 includes a servo motor 601, a drive gear 602, a synchronous belt 603, and a driven gear 604. The servo motor 601 is mounted on the left end of the gearbox 5. The drive gear 602 is fixedly connected to the right output end of the servo motor 601. The synchronous belt 603 is movably connected to the outer surface of the drive gear 602. The driven gear 604 is connected to the outer side of the screw groove layer 402. The other end of the synchronous belt 603 is movably connected to the driven gear 604. Figure 6 As shown, this structure is used to drive the active gear 602 to rotate by starting the servo motor 601, and drive the driven gear 604 to rotate the screw groove layer 402 by the synchronous belt 603, so as to transport raw materials by rotating the screw groove layer 402.

[0029] Furthermore, a screw core 401 is internally connected to the screw groove layer 402, and a high-temperature bearing is provided between the screw groove layer 402 and the screw core 401 to avoid direct friction between the two layers. Figure 6 As shown, this structure is used to connect the two ends of the screw core 401 to the gearbox 5 and the rear mandrel 702 respectively. The screw core 401 serves as a connection but does not rotate; only the screw groove layer 402 rotates to transport the raw materials.

[0030] Furthermore, a bladeless corner frame mold 7 is provided at the left end of the extruder barrel 2. The bladeless corner frame mold 7 includes a rear mold body 701, a rear mandrel 702, a connecting bolt 703, a middle mold body 704, a first screw 705, a die plate 706, a second screw 707, a die head 708, a front mandrel 709, and a wall thickness adjustment screw 710. The rear mold body 701 is provided at the left end of the extruder barrel 2 and is connected to the extruder barrel 2 via a connecting clamp 10. The rear mandrel 702 is installed at the center of the rear mold body 701, and a bladeless corner frame mold 702 is installed inside the rear mandrel 702. A connecting bolt 703 is used, which is compatible with bolt hole 403. A middle mold body 704 is provided on the left side of the rear mold body 701. The middle mold body 704 is connected to the rear mold body 701 by a first screw 705. A die plate 706 is provided on the left side of the middle mold body 704. The die plate 706 is connected to the middle mold body 704 by a second screw 707. A die head 708 is installed on the left side of the die plate 706. A front mandrel 709 is installed on the left side of the rear mandrel 702. A wall thickness adjustment screw 710 is connected to the outer surface of the die plate 706. Figure 7 As shown, this structure is used to compress plasticized raw materials through the rear mandrel 702 and the rear mold body 701 to form a blank, which is then extruded through the die head 708 and the front mandrel 709 into a vacuum cooling and shaping water tank with a sizing sleeve to be shaped into a tube. Then, it is pulled by a traction machine and pushed into a cutting machine. After being cut to a certain length, it is cut into finished tubes and then pushed onto a pipe stacking rack for stacking. After passing the inspection, it is packaged and put into storage.

[0031] Furthermore, a positioning assembly 8 is provided on the outer side of the gearbox 5. The positioning assembly 8 includes a reinforcing plate 801, a first bolt 802, and a second bolt 803. A reinforcing plate 801 is provided on the right side of the gearbox 5. Four sets of first bolts 802 are connected to the four corners of the reinforcing plate 801, and a second bolt 803 is connected to the center of the reinforcing plate 801. The end of the second bolt 803 is connected to the right end of the screw core 401. Figure 6 As shown, this structure is used to fix the gearbox 5 with four sets of first bolts 802, and then to reinforce the screw core 401 with second bolts 803 to prevent the screw core 401 from rotating.

[0032] Furthermore, the outer surface of the extruder barrel 2 is provided with three sets of cooling components 9. Each cooling component 9 includes a cooling pipe 901, a flow channel 902, a centrifugal fan 903, heat dissipation holes 904, and a dustproof net 905. The outer surface of the extruder barrel 2 is connected to the three sets of cooling pipes 901. The interior of each cooling pipe 901 is provided with a flow channel 902. A centrifugal fan 903 is installed at the rear end of each cooling pipe 901. The centrifugal fan 903 contains a heating element, capable of heating air to the required temperature before blowing it out as hot air. The centrifugal fan 903 is connected to the interior of the flow channel 902. The outer surface of the cooling pipe 901 is provided with equidistant heat dissipation holes 904, and a dustproof net 905 is connected to the opening of each heat dissipation hole 904. Figure 8 As shown, this structure is used to select and deliver hot or cold air as needed by starting the centrifugal fan 903. The cold air enters the flow channel 902 from the connection port, and the hot air is discharged from the heat dissipation hole 904 to cool the extruder barrel 2.

[0033] Furthermore, the inner wall of the cooling pipe 901, in contact with the extruder barrel 2, is made of copper. For example... Figure 8 As shown, this structure is used to enhance the heat transfer effect by using copper as the inner wall of the cooling pipe 901.

[0034] Working principle: When using, such as Figure 4 and Figure 6 As shown, the raw material is poured into the extruder barrel 2 through the feed inlet 3. Then, the servo motor 601 is started to drive the drive gear 602 to rotate. The synchronous belt 603 drives the driven gear 604 to rotate the screw groove layer 402. The raw material is conveyed through the rotation of the screw groove layer 402. Figure 8 As shown, when the device is operating, the centrifugal fan 903 is started, and cold air enters the flow channel 902 from the connection port, while hot air is discharged from the heat dissipation hole 904 to cool the extruder barrel 2. Figure 7As shown, the raw material is extruded into the rear mandrel 702 and the rear mold body 701 through the screw groove layer 402. After being plasticized, the raw material is compressed by the rear mandrel 702 and the rear mold body 701 to form a blank. It is then extruded into a vacuum cooling and shaping water tank with a sizing sleeve at the die head 708 and the front mandrel 709 to be shaped into a pipe. After being pulled by the traction machine, it is pushed into the cutting machine. After being cut to a certain length, it is cut into finished pipes of a certain length and then pushed onto the pipe stacking rack for stacking. After passing the inspection, it is packaged and put into storage. The above is the entire working principle of this utility model.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An extruder for producing non-adhesive tubing, comprising a frame (1) and an extruder barrel (2), characterized in that: An extruder barrel (2) is fixedly installed at the upper end of the frame (1). A feed port (3) is installed at the upper end of the extruder barrel (2). A double-layer screw mechanism (4) is provided inside the extruder barrel (2). A gearbox (5) is installed at the lower right end of the extruder barrel (2). A drive mechanism (6) is provided inside the gearbox (5). The double-layer screw mechanism (4) includes a screw core (401), a screw groove layer (402), and a bolt hole (403). The screw core (401) is provided inside the extruder barrel (2), and the screw groove layer (402) is provided on the outside of the screw core (401). The bolt hole (403) is provided on the left side of the screw core (401).

2. The extruder for producing non-adhesive tubing according to claim 1, characterized in that: The drive mechanism (6) includes a servo motor (601), a drive gear (602), a timing belt (603), and a driven gear (604). The servo motor (601) is installed on the left end of the gearbox (5). The drive gear (602) is fixedly connected to the right output end of the servo motor (601). The timing belt (603) is movably connected to the outer surface of the drive gear (602). The driven gear (604) is connected to the outer side of the screw groove layer (402). The other end of the timing belt (603) is movably connected to the driven gear (604).

3. The extruder for producing non-adhesive tubing according to claim 1, characterized in that: The screw groove layer (402) is internally connected to the screw core (401), and a high-temperature bearing is provided between the screw groove layer (402) and the screw core (401).

4. An extruder for producing non-adhesive tubing according to claim 1, characterized in that: The extruder barrel (2) has a bladeless corner frame mold (7) at its left end. The bladeless corner frame mold (7) includes a rear mold body (701), a rear mandrel (702), a connecting bolt (703), a middle mold body (704), a first screw (705), a die plate (706), a second screw (707), a die head (708), a front mandrel (709), and a wall thickness adjustment screw (710). The rear mold body (701) is connected to the extruder barrel (2) via a connecting clamp (10). The rear mandrel (702) is installed at the center of the rear mold body (701), and a connecting bolt is installed inside the rear mandrel (702). A bolt (703) is provided, the connecting bolt (703) is adapted to the bolt hole (403), a middle mold body (704) is provided on the left side of the rear mold body (701), the middle mold body (704) and the rear mold body (701) are connected by a first screw (705), a die plate (706) is provided on the left side of the middle mold body (704), the die plate (706) and the middle mold body (704) are connected by a second screw (707), a die head (708) is installed on the left side of the die plate (706), a front mandrel (709) is installed on the left side of the rear mandrel (702), and a wall thickness adjustment screw (710) is connected to the outer surface of the die plate (706).

5. An extruder for producing non-adhesive tubing according to claim 1, characterized in that: A positioning component (8) is provided on the outside of the gearbox (5). The positioning component (8) includes a reinforcing plate (801), a first bolt (802) and a second bolt (803). A reinforcing plate (801) is provided on the right side of the gearbox (5). Four sets of first bolts (802) are connected to the four corners of the reinforcing plate (801). A second bolt (803) is connected to the center of the reinforcing plate (801). The end of the second bolt (803) is connected to the right end of the screw core (401).

6. An extruder for producing non-adhesive tubing according to claim 1, characterized in that: The outer surface of the extruder barrel (2) is provided with three sets of cooling components (9). The cooling components (9) include cooling pipes (901), flow channels (902), centrifugal fans (903), heat dissipation holes (904) and dustproof nets (905). The outer surface of the extruder barrel (2) is connected to three sets of cooling pipes (901). The interior of the cooling pipes (901) is provided with flow channels (902). The rear end of the cooling pipes (901) is equipped with centrifugal fans (903). The centrifugal fans (903) are connected to the interior of the flow channels (902). The outer surface of the cooling pipes (901) is provided with heat dissipation holes (904) at equal intervals. The openings of the heat dissipation holes (904) are connected with dustproof nets (905).

7. An extruder for producing non-adhesive tubing according to claim 6, characterized in that: The inner wall of the cooling pipe (901) in contact with the extruder barrel (2) is made of copper.

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