Conical twin-screw extruder for water supply rigid pvc pipes

Abstract

The application discloses a conical double-screw extruder for hard polyvinyl chloride pipes for water supply, and relates to the technical field of pipe production. A feeding assembly for feeding is arranged at the top of a barrel. Material transmission and compaction are realized through the transmission of a first conical screw and a second conical screw. A driving assembly for driving the rotation of the first conical screw and the second conical screw is arranged on a base. An axial displacement compensation assembly is arranged in a first shell. The driving assembly and the axial displacement compensation assembly are connected to compensate for the axial displacement of the first conical screw and the second conical screw. Through the cooperation of the screw feeding, the conical double screw and the axial displacement compensation assembly, stable feeding and compaction conveying of PVC composite powder are realized. The axial displacement of the conical double screw is automatically compensated. The problems of the expansion of the meshing gap, the backflow of the material and the uneven plasticization of the traditional conical double-screw extruder caused by wear are effectively solved. The extrusion stability is improved, and the equipment maintenance cost and downtime are reduced.

Description

Technical Field

[0001] This invention relates to the field of pipe manufacturing technology, and in particular to a conical twin-screw extruder for rigid polyvinyl chloride pipes for water supply. Background Technology

[0002] With the acceleration of urbanization and infrastructure upgrading in my country, the market demand for rigid polyvinyl chloride (PVC) pipes for water supply continues to expand due to their advantages such as corrosion resistance, lightweight, and low cost. The domestic market size is expected to exceed 100 billion yuan in 2025, with an annual growth rate of around 10%.

[0003] Twin-screw extruders are commonly used equipment in plastics processing. Their operation includes PVC composite powder feeding, forced screw conveying, heating and plasticizing, and die extrusion molding. During forced screw conveying, fluctuations in material conveying pressure can cause axial movement of the screw, directly leading to increased material backflow and severely affecting the quality of the transported material. Furthermore, when axial movement of the screw occurs, the machine must be stopped and the equipment disassembled to replace the screw or barrel components, resulting in high maintenance costs and prolonged downtime, impacting production efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a conical twin-screw extruder for water supply rigid polyvinyl chloride pipe that achieves stable feeding and compaction conveying of PVC composite powder and automatically compensates for the axial movement of the conical twin-screw.

[0005] The technical solution adopted to solve the above-mentioned technical problems is as follows: A cylinder is installed on the top of the base, and a feeding assembly for feeding material is installed on the top of the cylinder. The bottom outlet end of the feeding assembly is connected to the top inlet end of the cylinder. A first conical screw and a second conical screw are installed inside the cylinder. Material enters the cylinder through the feeding assembly, and the material is transferred and compacted by the first and second conical screws. A drive assembly for driving the first and second conical screws to rotate is installed on the base. A first housing is installed on the top of the base, and an axial displacement compensation assembly is installed inside the first housing. The drive assembly and the axial displacement compensation assembly are connected. The axial displacement compensation component is used to compensate for the axial displacement of the first and second conical screws. An extrusion port is provided on the discharge side of the barrel. The axial displacement compensation component consists of: a contact plate rotatably mounted on the drive assembly; a fixing frame provided on the inner side wall of the first housing; the fixing frame rotatably connected to the contact plate; a trigger rod provided at the bottom of the contact plate; a fixing plate provided at the bottom of the first housing; a photoelectric sensor switch for sensing the displacement of the trigger rod provided on the fixing plate; and a first compensation rod and a second compensation rod slidably connected on the fixing plate in the horizontal direction, respectively contacting the drive assembly. The first compensation rod and the second compensation rod are used to compensate for the axial displacement of the first and second conical screws.

[0006] Furthermore, the connection point between the contact plate and the fixing frame is located below the connection point between the contact plate and the driving component.

[0007] Furthermore, the fixed plate is provided with a third motor electrically connected to the photoelectric sensor switch, and a lead screw is rotatably mounted on the fixed plate. The output shaft of the third motor is connected to one end of the lead screw, and the lead screw is threadedly connected to the slider. The fixed plate is provided with a guide rod that is slidably connected to the slider in the horizontal direction. The first compensation rod is provided on one side of the top of the slider, and the second compensation rod is provided on the other side of the top of the slider.

[0008] Furthermore, the barrel is provided with a first conical chamber and a second conical chamber. A second conical screw is placed in the first conical chamber, and a first conical screw is placed in the second conical chamber. The first and second conical chambers are interconnected and distributed at an angle along the axial direction. The inner wall contour of the first conical chamber is adapted to the outer contour of the second conical screw, and the inner wall contour of the second conical chamber is adapted to the outer contour of the first conical screw.

[0009] Furthermore, one end of the first conical screw and the second conical screw are respectively the large end, and the other end of the first conical screw and the second conical screw are respectively the small end. The large ends of the first conical screw and the second conical screw are respectively located on the feed side inside the barrel, and the small ends of the first conical screw and the second conical screw are respectively located on the discharge side inside the barrel. The diameter of the large end is larger than the diameter of the small end, and the outer diameter of the first conical screw and the second conical screw gradually narrows from the large end to the small end.

[0010] Furthermore, the base is provided with a second housing and a third housing on its top. The second housing is located on one side of the first housing, the first housing is located on one side of the barrel, and the third housing is located on one side of the second housing. The drive assembly is located inside the first housing, the second housing, and the third housing.

[0011] Furthermore, the drive assembly comprises: a second motor mounted on the base, the output shaft of the second motor connected to a reduction unit via a coupling, the reduction unit located inside the second housing, a second support plate inside the first housing, a third rotating shaft rotatably mounted on the second support plate, one end of the third rotating shaft connected to the reduction unit, and an eighth gear mounted on the other end of the third rotating shaft; a fourth rotating shaft rotatably mounted on the second support plate, one end of the fourth rotating shaft having a third gear meshing with the eighth gear, and the other end having a fourth gear; the large end of the second conical screw fixedly connected to a seventh rotating shaft via a first transmission unit, the seventh rotating shaft having a fifth gear meshing with the fourth gear; the large end of the first conical screw fixedly connected to a sixth rotating shaft via a second transmission unit, the sixth rotating shaft having a seventh gear meshing with the fourth gear, the fifth and seventh gears located on opposite sides of the bottom of the fourth gear; push plates mounted on the sixth and seventh rotating shafts, the push plates being connected to an axial displacement compensation assembly for compensating for the axial displacement of the first and second conical screws.

[0012] Furthermore, the reduction unit comprises: fourth fixed disks respectively arranged on both sides of the interior of the second housing; a fifth rotating shaft rotatably mounted between the two fourth fixed disks; a sixth gear mounted on the fifth rotating shaft; second fixed disks respectively arranged on both sides of the interior of the second housing; a second rotating shaft located above the fifth rotating shaft rotatably mounted between the two second fixed disks; a second gear meshing with the sixth gear mounted on the second rotating shaft; third fixed disks respectively arranged on both sides of the interior of the second housing; a first rotating shaft located above the second rotating shaft between the two third fixed disks; a first gear meshing with the second gear mounted on the first rotating shaft; a third rotating shaft rotatably mounted between the two first fixed disks, located below the first rotating shaft; a ninth gear meshing with the first gear mounted on the third rotating shaft.

[0013] Furthermore, the structure of the first transmission unit is the same as that of the second transmission unit. The first transmission unit is as follows: the large end of the second tapered screw is fixedly connected to one end of the first connecting member, the other end of the first connecting member is fixedly connected to one end of the second connecting member, the other end of the second connecting member is internally connected to one end of the seventh rotating shaft, one end of the seventh rotating shaft is provided with a ball, one half of the ball is locked with the hemispherical groove in the second connecting member, the other half of the ball is locked with the hemispherical groove in the first connecting member, and a bearing is provided between the connecting surfaces of the first connecting member, the second connecting member and the second support plate.

[0014] Furthermore, the feeding assembly comprises: a first support plate is provided on the top of the first housing, a first motor is provided on the first support plate, the output shaft of the first motor is fixedly connected to one end of the screw feed rod, a discharge pipe is provided at the top inlet end of the barrel, a feeding cylinder for feeding is provided at the top of the discharge pipe, the screw feed rod is located at the bottom of the inner side of the feeding cylinder, and the screw feed rod is used to push the material in the feeding cylinder into the discharge pipe.

[0015] The beneficial effects of the present invention are as follows: (1) The present invention achieves stable feeding and compaction conveying of PVC composite powder through the coordinated cooperation of spiral feeding, conical twin screw and axial displacement compensation component, automatically compensates for the axial movement of conical twin screw, effectively solves the problems of meshing gap expansion, material backflow and uneven plasticization caused by wear in traditional conical twin screw extruder, improves extrusion stability and reduces equipment maintenance costs and downtime.

[0016] (2) By combining the spiral feed rod and the twin screw forced conveying, the PVC composite powder is fed into the barrel evenly and continuously, avoiding the problem of uneven feeding that is easy to occur in traditional gravity feeding, and providing a reliable material supply for subsequent stable plasticization.

[0017] (3) In this invention, the two conical screws rotate in opposite directions, and the PVC powder is fully compacted during the conveying process to form a continuous and dense solid column, which improves the extrusion stability of the PVC powder.

[0018] (4) This invention addresses the problem of axial movement that easily occurs after long-term operation of conical screws. When the screw undergoes axial displacement, the axial displacement of the double conical screw is amplified. Through the cooperation of the push plate, the contact plate and the photoelectric sensor switch, the third motor can be quickly triggered to drive the screw slider to compensate for the axial displacement of the first and second conical screws. This effectively avoids problems such as material backflow and aggravated backflow caused by changes in meshing clearance. There is no need to stop the machine to disassemble and replace parts, which significantly extends the service life of the conical screw and the barrel, and reduces equipment maintenance costs and downtime. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a conical twin-screw extruder for a rigid polyvinyl chloride pipe for water supply according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the feeding assembly.

[0021] Figure 3 This is a structural diagram of the discharge pipe, the first motor, and the screw feed rod.

[0022] Figure 4 yes Figure 1The structural diagram is shown below with the cylinder, first housing, second housing, base, electrical cabinet, and third housing removed.

[0023] Figure 5 yes Figure 1 A structural diagram from another angle.

[0024] Figure 6 This is a schematic diagram of the internal structure of the barrel.

[0025] Figure 7 This is a schematic diagram of the drive component.

[0026] Figure 8 yes Figure 7 A structural diagram from another angle.

[0027] Figure 9 This is a schematic diagram of the connection structure between the first tapered screw, the second tapered screw, the drive assembly, and the axial displacement compensation assembly.

[0028] Figure 10 This is a schematic diagram of the structure of the first transmission unit.

[0029] Figure 11 yes Figure 10 A schematic diagram of the internal structure.

[0030] Figure 12 This is a schematic diagram of the axial displacement compensation component.

[0031] Reference numerals: 1. Barrel; 2. Feeding assembly; 201. Discharge pipe; 202. Feeding cylinder; 203. First motor; 204. First support plate; 205. Screw feed rod; 3. First housing; 4. Second housing; 5. Drive assembly; 501. First fixed plate; 502. Second fixed plate; 503. Third fixed plate; 504. First rotating shaft; 505. First gear; 506. Second gear; 507. Second rotating shaft; 508. Third rotating shaft; 509. Third gear; 510. Fourth rotating shaft; 511. Fourth gear; 512. Fifth gear; 513. Second support plate; 514. Fourth fixed plate; 515. Fifth rotating shaft; 516. Sixth gear; 517. Coupling; 518. Seventh gear; 519. 520. Eighth gear; 521. Ninth gear; 522. Push plate; 523. Sixth rotating shaft; 524. First connecting piece; 525. Second connecting piece; 526. Seventh rotating shaft; 527. Bearing; 528. Ball; 529. Second motor; 6. Axial displacement compensation assembly; 601. Slider; 602. Lead screw; 603. Fixing plate; 604. First compensation rod; 605. Contact plate; 606. Photoelectric sensor switch; 607. Guide rod; 608. Third motor; 609. Second compensation rod; 610. Trigger rod; 611. Fixing frame; 7. Base; 8. Electrical cabinet; 9. First conical screw; 10. Second conical screw; 11. Extrusion port; 12. Third housing; 13. First conical chamber; 14. Second conical chamber. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0033] like Figure 1 , Figures 4 to 6 As shown, the conical twin-screw extruder for rigid polyvinyl chloride pipes for water supply in this embodiment is composed of a barrel 1, a feeding assembly 2, a first housing 3, a second housing 4, a drive assembly 5, an axial displacement compensation assembly 6, a base 7, an electrical cabinet 8, a first conical screw 9, a second conical screw 10, an extrusion port 11, a third housing 12, a first conical chamber 13, and a second conical chamber 14 connected together.

[0034] An electrical cabinet 8 is installed on one side of the base 7. A cylinder 1 is installed on the top of the base 7. A feeding assembly 2 for feeding material is installed on the top of the cylinder 1. The bottom outlet end of the feeding assembly 2 is connected to the top inlet end of the cylinder 1. A first conical screw 9 and a second conical screw 10 are installed inside the cylinder 1. Material enters the cylinder 1 through the feeding assembly 2. The material is transferred and compacted by the first conical screw 9 and the second conical screw 10. A drive assembly 5 for driving the first conical screw 9 and the second conical screw 10 to rotate is installed on the base 7. The top of the base 7 is equipped with... The machine has a first housing 3, and an axial displacement compensation component 6 is provided inside the first housing 3. The drive component 5 is connected to the axial displacement compensation component 6 to compensate for the axial displacement of the first tapered screw 9 and the second tapered screw 10. The base 7 has a second housing 4 and a third housing 12 on its top. The second housing 4 is located on one side of the first housing 3, the first housing 3 is located on one side of the barrel 1, and the third housing 12 is located on one side of the second housing 4. The drive component 5 is located inside the first housing 3, the second housing 4, and the third housing 12. The barrel 1 has an extrusion port 11 on its discharge side.

[0035] like Figures 4 to 6 As shown, the barrel 1 is provided with a first conical chamber 13 and a second conical chamber 14. The second conical screw 10 is placed in the first conical chamber 13, and the first conical screw 9 is placed in the second conical chamber 14. The first conical chamber 13 and the second conical chamber 14 are interconnected and distributed at an angle along the axial direction. The inner wall contour of the first conical chamber 13 is adapted to the outer contour of the second conical screw 10, and the inner wall contour of the second conical chamber 14 is adapted to the outer contour of the first conical screw 9. One end of the first conical screw 9 and the second conical screw 10 are large ends, and the other end of the first conical screw 9 and the second conical screw 10 are small ends. The large ends of the first conical screw 9 and the second conical screw 10 are located on the feed side inside the barrel 1, and the small ends of the first conical screw 9 and the second conical screw 10 are located on the discharge side inside the barrel 1. The diameter of the large end is larger than the diameter of the small end, and the outer diameter of the first conical screw 9 and the second conical screw 10 gradually narrows from the large end to the small end.

[0036] like Figures 2 to 3 As shown, the feeding assembly 2 is composed of a discharge pipe 201, a feeding cylinder 202, a first motor 203, a first support plate 204, and a spiral feeding rod 205.

[0037] The feeding assembly 2 is as follows: a first support plate 204 is provided on the top of the first housing 3, a first motor 203 is provided on the first support plate 204, the output shaft of the first motor 203 is fixedly connected to one end of the screw feed rod 205, a discharge pipe 201 is provided at the top inlet end of the barrel 1, a feeding cylinder 202 for feeding is provided at the top of the discharge pipe 201, and the screw feed rod 205 is located at the inner bottom of the feeding cylinder 202. The screw feed rod 205 is used to push the material in the feeding cylinder 202 into the discharge pipe 201.

[0038] like Figures 7 to 11 As shown, the drive assembly 5 is composed of a first fixed disk 501, a second fixed disk 502, a third fixed disk 503, a first rotating shaft 504, a first gear 505, a second gear 506, a second rotating shaft 507, a third rotating shaft 508, a third gear 509, a fourth rotating shaft 510, a fourth gear 511, a fifth gear 512, a second support plate 513, a fourth fixed disk 514, a fifth rotating shaft 515, a sixth gear 516, a coupling 517, a seventh gear 518, an eighth gear 519, a ninth gear 520, a push plate 521, a sixth rotating shaft 522, a first connecting piece 523, a second connecting piece 524, a seventh rotating shaft 525, a bearing 526, a ball 527, and a second motor 528 connected together.

[0039] The drive assembly 5 consists of: a second motor 528 mounted on the base 7; the output shaft of the second motor 528 connected to a reduction unit via a coupling 517; the reduction unit located inside the second housing 4; a second support plate 513 located inside the first housing 3; a third rotating shaft 508 rotatably mounted on the second support plate 513; one end of the third rotating shaft 508 connected to the reduction unit; and an eighth gear 519 mounted on the other end of the third rotating shaft 508; a fourth rotating shaft 510 rotatably mounted on the second support plate 513; a third gear 509 meshing with the eighth gear 519 at one end of the fourth rotating shaft 510; and a fourth gear 511 at the other end of the fourth rotating shaft 510; and a second cone... The large end of the first conical screw 10 is fixedly connected to the seventh rotating shaft 525 through the first transmission unit. The seventh rotating shaft 525 is provided with a fifth gear 512 that meshes with the fourth gear 511. The large end of the first conical screw 9 is fixedly connected to the sixth rotating shaft 522 through the second transmission unit. The sixth rotating shaft 522 is provided with a seventh gear 518 that meshes with the fourth gear 511. The fifth gear 512 and the seventh gear 518 are located on both sides of the bottom of the fourth gear 511. Push plates 521 are provided on the sixth rotating shaft 522 and the seventh rotating shaft 525. The push plates 521 are connected to the axial displacement compensation assembly 6 to compensate for the axial displacement of the first conical screw 9 and the second conical screw 10.

[0040] like Figures 4 to 5 ,like Figures 7 to 8As shown, the reduction unit comprises: four fixed disks 514 respectively arranged on both sides of the interior of the second housing 4; a fifth rotating shaft 515 rotatably mounted between the two fourth fixed disks 514; a sixth gear 516 arranged on the fifth rotating shaft 515; two fixed disks 502 respectively arranged on both sides of the interior of the second housing 4; a second rotating shaft 507 located above the fifth rotating shaft 515 rotatably mounted between the two second fixed disks 502; a second gear 506 meshing with the sixth gear 516 on the second rotating shaft 507; and the reduction unit comprises: four fixed disks 514 respectively arranged on both sides of the interior of the second housing 4; a fifth rotating shaft 515 rotatably mounted between the two second fixed disks 502; a sixth gear 516 meshing with the sixth gear 516 on the second rotating shaft 507; and a fifth fixed disk 506 located above the fifth rotating shaft 515. A third fixed disk 503 is provided, and a first rotating shaft 504 is provided between the two third fixed disks 503, located on the side above the second rotating shaft 507. A first gear 505 that meshes with the second gear 506 is provided on the first rotating shaft 504. First fixed disks 501 are respectively provided on both sides inside the second housing 4. A third rotating shaft 508 is rotatably installed between the two first fixed disks 501. The third rotating shaft 508 is located on the side below the first rotating shaft 504. A ninth gear 520 that meshes with the first gear 505 is provided on the third rotating shaft 508.

[0041] The structure of the first transmission unit is the same as that of the second transmission unit, such as... Figures 10 to 11 As shown, the first transmission unit is as follows: the large end of the second conical screw 10 is fixedly connected to one end of the first connecting member 523, the other end of the first connecting member 523 is fixedly connected to one end of the second connecting member 524, the other end of the second connecting member 524 is internally connected to one end of the seventh rotating shaft 525, one end of the seventh rotating shaft 525 is provided with a ball 527, one half of the ball 527 is locked with the hemispherical groove in the second connecting member 524, and the other half of the ball 527 is locked with the hemispherical groove in the first connecting member 523. A bearing 526 is provided between the connecting surfaces of the first connecting member 523, the second connecting member 524 and the second support plate 513.

[0042] like Figure 9 , Figure 12 As shown, the axial displacement compensation assembly 6 is composed of a slider 601, a lead screw 602, a fixed plate 603, a first compensation rod 604, a contact plate 605, a photoelectric sensor switch 606, a guide rod 607, a third motor 608, a second compensation rod 609, a trigger rod 610, and a fixed frame 611.

[0043] The axial displacement compensation component 6 consists of: a contact plate 605 rotatably mounted on a push plate 521; a fixing frame 611 provided on the inner side wall of the first housing 3; the fixing frame 611 rotatably connected to the contact plate 605; the connection point between the contact plate 605 and the fixing frame 611 being located below the connection point between the contact plate 605 and the drive component 5; a trigger rod 610 provided at the bottom of the contact plate 605; a fixing plate 603 provided at the bottom of the first housing 3; a photoelectric sensor switch 606 for sensing the displacement of the trigger rod 610 provided on the fixing plate 603; the photoelectric sensor switch 606 is an infrared diffuse reflection photoelectric switch E3F-DS10C4; and a first compensation rod 604 and a second compensation rod 609, which respectively abut against the drive component 5, slidably connected along the horizontal direction on the fixing plate 603. The first compensation rod 604 and the second compensation rod 609 are used to compensate for the axial displacement of the first tapered screw 9 and the second tapered screw 10.

[0044] A third motor 608, electrically connected to a photoelectric sensor switch 606, is mounted on a fixed plate 603. The photoelectric sensor switch 606 is electrically connected to the third motor 608 via a relay. As soon as the trigger rod 610 moves to the sensing area of ​​the photoelectric sensor switch 606, it immediately outputs a weak electrical signal. The weak electrical signal is sent to the relay coil, causing the relay to activate and its main contacts to close. The relay then conducts the power supply circuit for the third motor 608, energizing and starting the third motor 608. A lead screw 602 is rotatably mounted on the fixed plate 603. The output shaft of the third motor 608 is connected to one end of the lead screw 602, which is threadedly connected to the slider 601. A guide rod 607 is mounted on the fixed plate 603 and slidably connected to the slider 601 in a horizontal direction. A first compensation rod 604 is located on one side of the top of the slider 601, and a second compensation rod 609 is located on the other side of the top of the slider 601.

[0045] The working principle of this embodiment is as follows: (1) Feeding: PVC composite powder is added to the feeding cylinder 202. The PVC composite powder enters the bottom of the feeding cylinder 202. The output shaft of the first motor 203 drives the spiral feeding rod 205 to rotate. Under the action of the spiral feeding rod 205, the PVC composite powder is pushed into the discharge pipe 201. The PVC composite powder in the discharge pipe 201 enters the inside of the machine cylinder 1.

[0046] (2) Conveying: The output shaft of the second motor 528 drives the first conical screw 9 and the second conical screw 10 to rotate through the coupling 517 and the reduction unit in sequence. The PVC composite powder is transported and compacted under the action of the first conical screw 9 and the second conical screw 10, forming a continuous and dense solid column that is output through the extrusion port 11.

[0047] The working principle of the reduction unit driving the first conical screw 9 and the second conical screw 10 to rotate is as follows: the output shaft of the second motor 528 drives the fifth rotating shaft 515 to rotate through the coupling 517. The sixth gear 516 on the fifth rotating shaft 515 meshes with the second gear 506, driving the second gear 506 and the second rotating shaft 507 to rotate. The second gear 506 meshes with the first gear 505, driving the first gear 505 and the first rotating shaft 504 to rotate. The first gear 505 meshes with the ninth gear 520, driving the ninth gear 520 to rotate. 0 drives the third rotating shaft 508 to rotate. The eighth gear 519 on the third rotating shaft 508 meshes with the third gear 509, driving the third gear 509 and the fourth rotating shaft 510 to rotate. The fourth gear 511 on the fourth rotating shaft 510 meshes with the seventh gear 518 and the fifth gear 512 respectively. The fifth gear 512 drives the seventh rotating shaft 525 to rotate. The seventh rotating shaft 525 drives the second conical screw 10 to rotate through the first transmission unit. The seventh gear 518 drives the sixth rotating shaft 522 to rotate. The sixth rotating shaft 522 drives the first conical screw 9 to rotate through the second transmission unit.

[0048] During long-term operation, the first tapered screw 9 and the second tapered screw 10 will move axially. The axial displacement compensation component 6 can compensate for the axial displacement of the first tapered screw 9 and the second tapered screw 10. The specific working principle is as follows: During long-term operation, the second tapered screw 10 will move axially in sequence through the first connecting member 523, the second connecting member 524, and the seventh rotating shaft 525. Similarly, the first tapered screw 9 will move axially through the second transmission unit to drive the sixth rotating shaft 522. The sixth rotating shaft 522 and the seventh rotating shaft 525 will drive the push plate 521 to move axially. The abutment plate 605 on the push plate 521 will swing on the push plate 521 and the fixed frame 611 respectively. 1. The trigger rod 610 at the bottom of the contact plate 605, which is fixed to the inner wall of the first housing 3, undergoes a reverse displacement, amplifying the axial displacement of the first conical screw 9 and the second conical screw 10. The trigger rod 610 moves to trigger the photoelectric sensor switch 606, which starts the third motor 608. The output shaft of the third motor 608 drives the lead screw 602 to rotate. The slider 601 moves horizontally on the lead screw 602 and the guide rod 607. The first compensation rod 604 on the slider 601 moves to contact the seventh rotating shaft 525, and the second compensation rod 609 on the slider 601 moves to contact the sixth rotating shaft 522. The first compensation rod 604 and the second compensation rod 609 compensate for the axial displacement of the first conical screw 9 and the second conical screw 10.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A conical twin-screw extruder for rigid polyvinyl chloride pipes for water supply, characterized in that: A cylinder (1) is provided on the top of the base (7). A feeding assembly (2) for feeding is provided on the top of the cylinder (1). The bottom outlet end of the feeding assembly (2) is connected to the top inlet end of the cylinder (1). A first conical screw (9) and a second conical screw (10) are installed inside the cylinder (1). The material enters the cylinder (1) through the feeding assembly (2). The material is transmitted and compacted by the transmission of the first conical screw (9) and the second conical screw (10). A drive assembly (5) for driving the first conical screw (9) and the second conical screw (10) to rotate is provided on the base (7). A first housing (3) is provided on the top of the base (7). An axial displacement compensation assembly (6) is provided inside the first housing (3). The drive assembly (5) and the axial displacement compensation assembly (6) are connected to compensate for the axial displacement of the first conical screw (9) and the second conical screw (10). An extrusion port (11) is provided on the discharge side of the cylinder (1). The axial displacement compensation component (6) is as follows: a contact plate (605) is rotatably mounted on the drive component (5), a fixing frame (611) is provided on the inner side wall of the first housing (3), the fixing frame (611) is rotatably connected to the contact plate (605), a trigger rod (610) is provided at the bottom of the contact plate (605), a fixing plate (603) is provided at the bottom of the first housing (3), a photoelectric sensor switch (606) for sensing the displacement of the trigger rod (610) is provided on the fixing plate (603), and a first compensation rod (604) and a second compensation rod (609) that respectively abut against the drive component (5) are slidably connected on the fixing plate (603) in the horizontal direction. The first compensation rod (604) and the second compensation rod (609) are used to compensate for the axial displacement of the first tapered screw (9) and the second tapered screw (10). The connection point between the contact plate (605) and the fixing frame (611) is located below the connection point between the contact plate (605) and the driving assembly (5); The fixed plate (603) is provided with a third motor (608) electrically connected to the photoelectric sensor switch (606). A lead screw (602) is rotatably mounted on the fixed plate (603). The output shaft of the third motor (608) is connected to one end of the lead screw (602). The lead screw (602) is threadedly connected to the slider (601). The fixed plate (603) is provided with a guide rod (607) that is slidably connected to the slider (601) in the horizontal direction. A first compensation rod (604) is provided on one side of the top of the slider (601), and a second compensation rod (609) is provided on the other side of the top of the slider (601).

2. The conical twin-screw extruder for rigid polyvinyl chloride pipes for water supply according to claim 1, characterized in that: The barrel (1) is provided with a first conical chamber (13) and a second conical chamber (14). A second conical screw (10) is placed in the first conical chamber (13), and a first conical screw (9) is placed in the second conical chamber (14). The first conical chamber (13) and the second conical chamber (14) are interconnected and distributed at an angle along the axial direction. The inner wall contour of the first conical chamber (13) is adapted to the outer contour of the second conical screw (10), and the inner wall contour of the second conical chamber (14) is adapted to the outer contour of the first conical screw (9).

3. The conical twin-screw extruder for rigid polyvinyl chloride pipes for water supply according to claim 1, characterized in that: The first conical screw (9) and the second conical screw (10) have large ends at one end and small ends at the other end. The large ends of the first conical screw (9) and the second conical screw (10) are located on the feed side inside the barrel (1), and the small ends of the first conical screw (9) and the second conical screw (10) are located on the discharge side inside the barrel (1). The diameter of the large end is larger than the diameter of the small end, and the outer diameter of the first conical screw (9) and the second conical screw (10) gradually narrows from the large end to the small end.

4. The conical twin-screw extruder for rigid polyvinyl chloride pipes for water supply according to claim 1, characterized in that, The base (7) is provided with a second housing (4) and a third housing (12) on top. The second housing (4) is located on one side of the first housing (3), the first housing (3) is located on one side of the barrel (1), and the third housing (12) is located on one side of the second housing (4). The drive assembly (5) is located inside the first housing (3), inside the second housing (4), and inside the third housing (12).

5. The conical twin-screw extruder for rigid polyvinyl chloride pipes for water supply according to claim 4, characterized in that: The drive assembly (5) is as follows: a second motor (528) is provided on the base (7), the output shaft of the second motor (528) is connected to the reduction unit through a coupling (517), the reduction unit is located inside the second housing (4), a second support plate (513) is provided inside the first housing (3), a third rotating shaft (508) is rotatably mounted on the second support plate (513), one end of the third rotating shaft (508) is connected to the reduction unit, the other end of the third rotating shaft (508) is provided with an eighth gear (519), a fourth rotating shaft (510) is rotatably mounted on the second support plate (513), one end of the fourth rotating shaft (510) is provided with a third gear (509) that meshes with the eighth gear (519), the other end of the fourth rotating shaft (510) is provided with a fourth gear (511), the second The large end of the conical screw (10) is fixedly connected to the seventh rotating shaft (525) through the first transmission unit. The seventh rotating shaft (525) is provided with a fifth gear (512) that meshes with the fourth gear (511). The large end of the first conical screw (9) is fixedly connected to the sixth rotating shaft (522) through the second transmission unit. The sixth rotating shaft (522) is provided with a seventh gear (518) that meshes with the fourth gear (511). The fifth gear (512) and the seventh gear (518) are located on the bottom sides of the fourth gear (511) respectively. The sixth rotating shaft (522) and the seventh rotating shaft (525) are provided with push plates (521). The push plates (521) are connected to the axial displacement compensation component (6) to compensate for the axial displacement of the first conical screw (9) and the second conical screw (10).

6. The conical twin-screw extruder for rigid polyvinyl chloride pipes for water supply according to claim 5, characterized in that, The reduction unit is as follows: A fourth fixed disk (514) is provided on each of the two sides inside the second housing (4), and a fifth rotating shaft (515) is rotatably mounted between the two fourth fixed disks (514). A sixth gear (516) is provided on the fifth rotating shaft (515). A second fixed disk (502) is provided on each of the two sides inside the second housing (4), and a second rotating shaft (507) located above the fifth rotating shaft (515) is rotatably mounted between the two second fixed disks (502). A second gear (506) that meshes with the sixth gear (516) is provided on the second rotating shaft (507). The second housing (4) is further equipped with... A third fixed disk (503) is provided, and a first rotating shaft (504) is provided between the two third fixed disks (503) on the side above the second rotating shaft (507). A first gear (505) that meshes with the second gear (506) is provided on the first rotating shaft (504). A first fixed disk (501) is provided on both sides inside the second housing (4). A third rotating shaft (508) is rotatably installed between the two first fixed disks (501). The third rotating shaft (508) is located on the side below the first rotating shaft (504). A ninth gear (520) that meshes with the first gear (505) is provided on the third rotating shaft (508).

7. The conical twin-screw extruder for rigid polyvinyl chloride pipes for water supply according to claim 5, characterized in that, The structure of the first transmission unit is the same as that of the second transmission unit. The first transmission unit is as follows: the large end of the second conical screw (10) is fixedly connected to one end of the first connector (523), the other end of the first connector (523) is fixedly connected to one end of the second connector (524), the other end of the second connector (524) is connected to one end of the seventh rotating shaft (525), one end of the seventh rotating shaft (525) is provided with a ball (527), one half of the ball (527) is locked with the hemispherical groove in the second connector (524), the other half of the ball (527) is locked with the hemispherical groove in the first connector (523), and a bearing (526) is provided between the connecting surfaces of the first connector (523), the second connector (524) and the second support plate (513).

8. The conical twin-screw extruder for rigid polyvinyl chloride pipes for water supply according to claim 1, characterized in that, The feeding assembly (2) is as follows: a first support plate (204) is provided on the top of the first housing (3), a first motor (203) is provided on the first support plate (204), the output shaft of the first motor (203) is fixedly connected to one end of the spiral feed rod (205), a discharge pipe (201) is provided at the top inlet end of the barrel (1), a feed cylinder (202) for feeding is provided at the top of the discharge pipe (201), the spiral feed rod (205) is located at the bottom of the feed cylinder (202), and the spiral feed rod (205) is used to push the material in the feed cylinder (202) into the discharge pipe (201).

Images