Manufacturing device for medical polytetrafluoroethylene multi-cavity air guide sieve tube

Abstract

The utility model discloses a manufacturing device for a medical polytetrafluoroethylene multi-cavity air guide sieve tube, which comprises a horizontal extruder structure, the horizontal extruder structurally comprises a working plane, a multi-material-selecting-barrel device, a push rod push-pull transmission component and a core rod push-pull transmission component. The multi-material-selecting-barrel device comprises a first rotary disc, a rotary bearing shaft, a second rotary disc and a plurality of material barrels. The push rod push-pull transmission part comprises a push rod driving mechanism, a movable plate and a push rod; the core rod push-pull transmission part comprises a core rod driving mechanism, a core rod and a die head assembly; the axes of the core rod, the push rod, the piston and the core mold are located on the same straight line, and the axis of the inner hole in the mold head and the axis of the inner hole in the charging barrel are located on the same straight line. The manufacturing device disclosed by the utility model can be used for manufacturing the medical multi-cavity air guide sieve tube with uniform inner hole and wall thickness, the structural design is reasonable, the die head assembly is simple and convenient to mount and dismount, and the dismounting and mounting times of the charging barrel are also reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of manufacturing polytetrafluoroethylene pipes, in particular to a manufacturing device for a medical polytetrafluoroethylene multi-cavity air-guiding screen tube. Background Art

[0002] Polytetrafluoroethylene is a type of thermoplastic, known as the "king of plastics". It has the characteristics of high melting point, high temperature resistance, continuous use temperature of 260°C, resistance to chemical solvents, low friction coefficient, electrical insulation, good biocompatibility, no decomposition, no adverse reactions when implanted in the human body and no obvious aging. It is widely used in semiconductors, aerospace, electronics, machinery, medicine and other fields.

[0003] In recent years, intravascular interventional therapy is an emerging medical technology that uses interventional catheters to reach distant lesions in the body (such as the vascular cavities of the coronary arteries, brain, liver and kidneys) through the vascular lumen, and then injects diagnostic and therapeutic agents to achieve low-invasive treatment of distant parts of the body. It has become one of the three major clinical medicines alongside surgery and internal medicine. Interventional medicine is a minimally invasive medical field that uses medical imaging equipment to place precision instruments, such as special catheters and guidewires, to locally diagnose and treat pathological conditions in the body, and has received widespread attention.

[0004] Ideal interventional catheter materials should meet the following basic characteristics: 1. Good biocompatibility, especially blood compatibility, no harmful substances in the body; 2. Appropriate softness and good lubricity to reduce damage to blood vessel walls and blood cells; 3. Excellent torque conductivity and anti-kink; 4. Good compatibility with radiopaque agents; 5. Good processability; 6. Certain pressure resistance. Interventional catheters can be made into different shapes according to different uses and different application sites.

[0005] The equipment used in traditional production of medical gas guide screen tubes has many parts in the mold, such as large die head, mold fixing block, core mold, core mold fixing structure, etc., which leads to cumbersome installation and disassembly process of parts in the mold during use. If the barrel of different sizes is replaced in the equipment, it is necessary to remove the originally installed barrel from the equipment and reinstall the new barrel, and then assemble the new barrel with the corresponding mold. The whole operation process is cumbersome, and the preform is easy to shake in the cavity, forming radial eccentricity between the core rod, resulting in eccentricity of the inner hole of the prepared multi-cavity gas guide screen tube and poor uniformity of wall thickness, which ultimately affects the appearance quality and use function of the product. Summary of the invention

[0006] The technical problem to be solved by the utility model is to provide a manufacturing device for a medical polytetrafluoroethylene multi-cavity air-conducting sieve tube in view of the deficiencies of the above-mentioned prior art. The manufacturing device for a medical polytetrafluoroethylene multi-cavity air-conducting sieve tube can prepare a medical multi-cavity air-conducting sieve tube with uniform inner hole and wall thickness, has a reasonable structural design, and the die head assembly is simple and convenient to install and disassemble, and the number of times the barrel is disassembled and assembled is also reduced.

[0007] In order to achieve the above technical purpose, the technical solution adopted by the utility model is:

[0008] A manufacturing device for a medical polytetrafluoroethylene multi-cavity air guide screen tube, comprising a horizontal extruder structure, wherein the horizontal extruder structure comprises a working plane, a multi-select barrel device, a push rod push-pull transmission component, and a core rod push-pull transmission component; the multi-select barrel device, the push rod push-pull transmission component, and the core rod push-pull transmission component are all arranged on the working plane;

[0009] The working plane is connected with a right end stopper, an upper fixing plate and a motor mounting plate;

[0010] The multi-selection barrel device comprises a turntable 1, a rotating bearing shaft, a turntable 2 and a plurality of barrels; the front end of the rotating bearing shaft is connected to the right end stopper, and the rear end is connected to the upper fixed plate; the center hole of the turntable 1 and the center hole of the turntable 2 are both rotatably connected to the rotating bearing shaft; the plurality of barrels penetrate the turntable 1 and the turntable 2 and are connected to the turntable 1 and the turntable 2; the plurality of barrels are arranged along the circumferential direction of the turntable 1 and the turntable 2; that is, the center points of the plurality of barrels on the turntable 1 or the turntable 2 are located on the same circle, and the center of the circle is located on the axis of the center holes of the turntable 1 and the turntable 2; the turntable 1 and the turntable 2 have the same structure;

[0011] The push rod push-pull transmission component includes a push rod driving mechanism, a movable plate and a push rod. The upper fixed plate and the motor mounting plate are connected by a light rod, the movable plate is slidably connected to the light rod, the push rod driving mechanism is connected to the motor mounting plate, the driving end of the push rod driving mechanism is connected to the movable plate and is used to push and pull the movable plate, the movable plate is connected to the push rod, the push rod passes through the through hole on the upper fixed plate and the push rod can slide in the through hole on the upper fixed plate; the push rod is detachably connected to a piston, and the piston on the push rod can be extended into the barrel of the multi-select barrel device under the push of the movable plate, and the piston is in close sliding contact with the inner wall of the barrel;

[0012] The core rod push-pull transmission component includes a core rod driving mechanism, a core rod and a die head assembly; the core rod driving mechanism is connected to the motor mounting plate, the driving end of the core rod driving mechanism is connected to the core rod and is used to push and pull the core rod, the push rod is provided with an axial hole extending along the length direction of the push rod, the core rod passes through the axial hole of the push rod and the through hole on the piston and the core rod can slide in the axial hole of the push rod and the through hole on the piston, the die head assembly includes a die head, a die head fixing ring and a core mold, the die head is detachably connected to the barrel of the multi-selection barrel device through the die head fixing ring, and the core mold is detachably connected to the core rod;

[0013] The axes of the core rod, the push rod, the piston and the core mold are located on the same straight line, and the axes of the inner hole in the die head and the inner hole in the barrel are located on the same straight line.

[0014] As a further improved technical solution of the utility model, the front end of the rotating load-bearing shaft is connected to the right end stopper through the load-bearing shaft fixing block, and the load-bearing shaft fixing block and the right end stopper are connected by bolts, and the rear end of the rotating load-bearing shaft is connected to the upper fixed plate through the load-bearing shaft fixing block, and the load-bearing shaft fixing block and the upper fixed plate are connected by bolts.

[0015] As a further improved technical solution of the utility model, the multiple barrels include a barrel with a diameter of 40 mm, a barrel with a diameter of 45 mm and a barrel with a diameter of 50 mm.

[0016] As a further improved technical solution of the utility model, multiple different barrels are used to add polytetrafluoroethylene preforms, and the outer circle of the polytetrafluoroethylene preforms is matched with a small gap between the inner wall of the barrel, thereby reducing the shaking of the polytetrafluoroethylene preforms in the barrel, reducing eccentricity, and improving concentricity.

[0017] As a further improved technical solution of the utility model, there are two push rod driving mechanisms, and the driving ends of the two push rod driving mechanisms pass through the reserved through holes on the motor mounting plate and are locked with the movable plate by nuts. The movable plate is threadedly connected to one end of the push rod, and the other end of the push rod is threadedly connected to the piston.

[0018] As a further improved technical solution of the utility model, there are two core rod driving mechanisms, and the driving ends of the two core rod driving mechanisms are both inserted through the reserved through holes on the motor mounting plate and then locked with the sliding block by a nut. One end of the core rod is inserted through the through hole in the center of the motor mounting plate and then connected to the sliding block through the core rod fixing block. The core rod fixing block and the sliding block are connected by bolts, and the core rod is slidably and sealedly connected to the through hole on the piston.

[0019] As a further improved technical solution of the utility model, the core rod is made of 304 stainless steel; the push rod driving mechanism adopts electric cylinder one, which is connected to the motor mounting plate through the cylinder front flange and bolts, and the electric cylinder one adopts a 5T motor; the core rod driving mechanism adopts electric cylinder two, which is connected to the motor mounting plate through the cylinder front flange and bolts, and the electric cylinder two adopts a 500kg motor.

[0020] As a further improved technical solution of the utility model, the die head fixing ring is connected to the barrel by bolts, and the core mold is located in the inner cavity of the die head.

[0021] As a further improved technical solution of the utility model, the core mold includes a threaded area, a conical area and multiple core rods, the threaded area, the conical area and the multiple core rods are fixedly connected in sequence, and the threaded area is threadedly connected to the end hole on the core rod.

[0022] As a further improved technical solution of the utility model, the number of the core rods is an even number, the length of the core rods is 20-30% of the total length of the core mold, and the gap between each core rod is preferably 0.5-1 mm.

[0023] As a further improved technical solution of the utility model, it also includes a sintering device, and the sintering device is located near the outlet end of the horizontal extruder structure.

[0024] The beneficial effects of the utility model are:

[0025] 1. The utility model adopts a horizontal extrusion mechanism, including a rotatable barrel and a sliding block connected to a core rod. One end of all barrels on turntable 1 and turntable 2 can be pre-fixed and installed with a die of matching size through a die fixing ring and bolts, and then the preformed blank is added to the other end of the barrel to be used. One end of the core rod is threadedly connected to a core mold of a suitable size, which can drive the electric cylinder 1 and the electric cylinder 2 to move and realize extrusion. In the overall process, the die assembly has a simple structure, and the bolt connection method between the die fixing ring and the barrel and the threaded connection method between the core mold and the core rod make the assembly and disassembly of the die assembly simple and convenient, and the replacement efficiency of the die assembly is high. In addition, when replacing the barrel, it is only necessary to rotate turntable one and turntable two and align the appropriate barrel coaxially with the push rod (or with the through hole of the upper fixed plate), which saves the operation of disassembling the old barrel and then installing the new barrel in the original position of the old barrel, reduces the number of times the barrel is disassembled and assembled, is convenient and fast, saves time and effort, and the outer circle of the polytetrafluoroethylene preform and the small gap between the inner wall of the barrel are matched, which reduces the shaking of the polytetrafluoroethylene preform in the barrel, reduces eccentricity, improves concentricity, and prevents radial eccentricity with the core rod, thereby ensuring the appearance quality and wall thickness uniformity of the medical multi-cavity gas guide screen tube. At the same time, the device is suitable for large-scale industrialization.

[0026] 2. When the electric cylinder 1 in the push rod driving mechanism is turned on, the electric cylinder 1 pushes the push rod toward the barrel, and the piston of the push rod enters the barrel. The outer circle of the piston slides with the inner wall of the barrel in a sealed manner. At this time, the axis of the piston is aligned with the axis of the barrel. Since the axes of the piston, core rod, push rod, and core mold are located on the same straight line, the axis of the inner hole of the die head and the axis of the inner hole of the barrel are located on the same straight line, therefore, it is ensured that the axis of the core mold and the axis of the die head are located on the same straight line, and the core mold is located at the center of the die head, further ensuring the concentricity of the polytetrafluoroethylene preform and the core mold, the piston of the push rod pushes the polytetrafluoroethylene preform in the barrel, the polytetrafluoroethylene preform enters the cavity between the die head and the core mold, and then extrudes the medical multi-lumen tubing blank from the outlet of the die head, and then is sintered by the sintering device, and finally a medical multi-lumen gas guide screen tube with uniform inner hole and wall thickness is formed.

[0027] 3. The utility model horizontal extruder is provided with a multi-select barrel device, which can meet the use requirements of three preforms with different diameters. The barrel length can be added with three 30cm long polytetrafluoroethylene preforms, reducing the number of feeding times, and can form a longer polytetrafluoroethylene multi-lumen tube at one time. The medical multi-lumen tube has uniform wall thickness and good dimensional stability. In addition, the number of barrels on the turntable 1 and turntable 2 of the utility model is not limited to 3, and can be set according to requirements. The barrels installed on the turntable 1 and turntable 2 are commonly used barrels.

[0028] 4. The push rod of the utility model is threadedly connected to the piston, which is convenient for replacing pistons of different outer diameters on the push rod. The core mold and the core rod are threadedly connected, which is also convenient for replacing core molds of different sizes on the core rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional structural schematic diagram of the manufacturing device in the utility model.

[0030] Figure 2 It is a three-dimensional structural schematic diagram of the horizontal extruder structure in the utility model.

[0031] Figure 3 It is a plan view of the horizontal extruder structure in the utility model.

[0032] Figure 4 for Figure 3 Middle AA section view.

[0033] Figure 5 for Figure 4 A partial enlarged view of middle A.

[0034] Figure 6 It is a schematic diagram of the structure of the die assembly.

[0035] Figure 6 (a) is a cross-sectional view of the die assembly.

[0036] Figure 6 (b) is a side view of the die assembly.

[0037] Figure 7 The utility model is a schematic diagram of the structure of a twelve-cavity gas-conducting test tube for traditional Chinese medicine.

[0038] In the figure: 1, sintering equipment; 2, right end stopper; 3, bearing shaft fixing block; 4, turntable 1; 5, rotating bearing shaft; 6, barrel; 7, turntable 2; 8, upper fixing plate; 9, polished rod; 10, push rod; 11, movable plate; 12, core rod; 13, motor mounting plate; 14, cylinder front flange; 15, sliding block; 16, push rod driving mechanism; 17, core rod driving mechanism; 18, support rod; 19, working plane; 20, die head; 201, conical inner hole; 202, cylindrical inner hole; 21, die head fixing ring; 22, core mold; 221, threaded area; 222, conical area; 223, core rod; 23, piston. DETAILED DESCRIPTION

[0039] The specific implementation of the utility model is further described below according to the accompanying drawings:

[0040] A manufacturing device for a medical polytetrafluoroethylene multi-cavity air-guiding screen tube comprises a horizontal extruder structure and a sintering device 1, wherein the sintering device 1 is located near the outlet end of the horizontal extruder structure.

[0041] The horizontal extruder structure includes a working plane 19 , a multi-select barrel device, a push rod push-pull transmission component and a core rod push-pull transmission component; the multi-select barrel device, the push rod push-pull transmission component and the core rod push-pull transmission component are all built on the working plane 19 .

[0042] like Figure 1-2 As shown, the right end stopper 2, the upper fixing plate 8 and the motor mounting plate 13 are fixedly connected to the working plane 19.

[0043] like Figure 1-4 As shown, the multi-selection barrel device includes a rotating load-bearing shaft 5, a turntable 4, a turntable 2 7 and a plurality of barrels 6; the front end of the rotating load-bearing shaft 5 is connected to the right end stopper 2, and the rear end is connected to the upper fixed plate 8, the center hole of the turntable 4 and the center hole of the turntable 2 7 are both rotatably connected to the rotating load-bearing shaft 5, the plurality of barrels 6 pass through the turntable 1 4 and the turntable 2 7 and are connected to the turntable 1 4 and the turntable 2 7, and the plurality of barrels 6 are evenly spaced along the circumferential direction of the turntable 1 4 and the turntable 2 7.

[0044] like Figure 1-4As shown, the push rod push-pull transmission component includes a push rod drive mechanism 16, a movable plate 11 and a push rod 10. The upper fixed plate 8 and the motor mounting plate 13 are connected by a light rod 9. The cross-sectional shape of the light rod 9 is circular and there are four of them. The movable plate 11 is slidably connected to the light rod 9, the push rod drive mechanism 16 is connected to the motor mounting plate 13, the rear end of the push rod drive mechanism 16 is connected to the working plane 19 through a support rod 18, the driving end of the push rod drive mechanism 16 is connected to the movable plate 11 and is used to push and pull the movable plate 11, the movable plate 11 is connected to the push rod 10, the push rod 10 passes through the through hole on the upper fixed plate 8 and the push rod 10 can slide in the through hole on the upper fixed plate 8; the push rod 10 is detachably connected with a piston 23, the piston 23 on the push rod 10 can extend into the barrel 6 of the multi-selection barrel device or can be separated from the barrel 6 of the multi-selection barrel device under the push and pull of the movable plate 11, and the piston 23 is in close sliding contact with the inner wall of the barrel 6.

[0045] like Figure 1-4 As shown, the core rod push-pull transmission component includes a core rod driving mechanism 17, a core rod 12 and a die assembly; the core rod driving mechanism 17 is connected to the motor mounting plate 13, the driving end of the core rod driving mechanism 17 is connected to the core rod 12 and is used to push and pull the core rod 12, the push rod 10 is sleeved with the core rod 12, that is, the push rod 10 is provided with an axial hole extending along the length direction of the push rod 10, the core rod 12 passes through the axial hole of the push rod 10 and the through hole on the piston 23, and the core rod 12 can slide in the axial hole of the push rod 10 and the through hole on the piston 23. The die assembly includes a die 20, a die fixing ring 21 and a core mold 22, the die 20 is detachably connected to the barrel 6 of the multi-selection barrel device through the die fixing ring 21, and the core mold 22 is detachably connected to the front end of the core rod 12.

[0046] The axes of the core rod 12, the push rod 10, the piston 23, and the core mold 22 are located on the same straight line. The cross sections of the core rod 12, the push rod 10, and the piston 23 are all circular. The axis of the inner hole of the die head 20 and the axis of the inner hole of the barrel 6 are located on the same straight line. The inner hole of the die head 20 and the inner hole of the barrel 6 are both through holes.

[0047] In this embodiment, the front end of the rotating load-bearing shaft 5 is connected to the right end stopper 2 through the load-bearing shaft fixing block 3, and the load-bearing shaft fixing block 3 and the right end stopper 2 are connected by bolts, and the rear end of the rotating load-bearing shaft 5 is connected to the upper fixed plate 8 through the load-bearing shaft fixing block 3, and the load-bearing shaft fixing block 3 and the upper fixed plate 8 are connected by bolts.

[0048] In this embodiment, the plurality of barrels 6 include a barrel with a diameter of 40 mm, a barrel with a diameter of 45 mm, and a barrel with a diameter of 50 mm, and the lengths are all 90 cm. The barrel 6 is used to add the polytetrafluoroethylene preform, and the outer circle of the polytetrafluoroethylene preform is matched with the inner wall of the barrel 6 with a small gap, so as to reduce the shaking of the polytetrafluoroethylene preform in the barrel 6, reduce eccentricity, and improve concentricity.

[0049] In this embodiment, there are two push rod driving mechanisms 16, and the driving ends of the two push rod driving mechanisms 16 are both inserted through the reserved through holes on the motor mounting plate 13 and are locked with the movable plate 11 by nuts. The driving ends of the push rod driving mechanisms 16 are slidingly connected to the reserved through holes on the motor mounting plate 13, the through hole in the middle of the movable plate 11 is threadedly connected to the push rod 10, and the push rod 10 is threadedly connected to the piston 23.

[0050] In this embodiment, there are two core rod driving mechanisms 17, and the driving ends of the two core rod driving mechanisms 17 are connected to the sliding block 15 by nuts after passing through the reserved through holes on the motor mounting plate 13, and the reserved through holes on the motor mounting plate 13 are connected to the driving ends of the core rod driving mechanisms 17 in a sliding manner. The core rod 12 is located in the axial hole of the push rod 10 and passes through the through hole in the middle of the movable plate 11 and the through hole in the middle of the motor mounting plate 13 in sequence, and is connected to the sliding block 15 through the core rod fixing block and bolts, and the core rod 12 is connected to the through hole in the middle of the motor mounting plate 13 in a sliding manner. The core rod 12 is supported inside the push rod 10 through the piston 23 and the through hole in the center of the motor mounting plate 13, and the axis of the core rod 12 and the axis of the push rod 10 can be located on the same straight line. Driven by the core rod driving mechanism 17, the core rod 12 can slide inside the push rod 10, inside the piston 23, and inside the through hole in the middle of the motor mounting plate 13. The core rod fixing block is connected to the sliding block 15 by bolts, and the core rod 12 is connected to the through hole on the piston 23 in a sliding and sealing manner.

[0051] In this embodiment, the core rod 12 is made of 304 stainless steel; the push rod driving mechanism 16 adopts electric cylinder 1, which is connected to the motor mounting plate 13 through the cylinder front flange 14 and bolts, and the electric cylinder 1 adopts a 5T motor; the core rod driving mechanism 17 adopts electric cylinder 2, which is connected to the motor mounting plate 13 through the cylinder front flange 14 and bolts, and the electric cylinder 2 adopts a 500kg motor.

[0052] In this embodiment, Figure 6 As shown, the core mold 22 includes a threaded area 221, a conical area 222 and a plurality of core rods 223, the threaded area 221, the conical area 222 and the plurality of core rods 223 are fixedly connected in sequence, and the threaded area 221 is threadedly connected to the end hole on the core rod 12.

[0053] In this embodiment, the die head fixing ring 21 is connected to the end surface of the barrel 6 by bolts or screws, and the core mold 22 is located in the inner hole of the die head 20. Figure 5 As shown, the inner hole of the die head 20 includes a conical inner hole 201 and a cylindrical inner hole 202. The cylindrical inner hole 202 passes through one end of the die head 20 to form an outlet of the die head 20. The conical area 222 of the core mold 22 is located in the conical inner hole 201 of the die head 20, and the core rod 223 of the core mold 22 is located in the cylindrical inner hole 202.

[0054] Furthermore, in order to reduce the eccentricity of the blank in the cavity and improve the concentricity of the multi-cavity pipe, the horizontal extruder in the utility model is provided with a multi-select barrel device and a die assembly. One end of the die assembly is fixedly connected to the end hole on the barrel 6 by a die fixing ring 21 with multiple mounting holes through bolts. Preferably, the die fixing ring 21 is provided with 4 through screw holes to reduce the number of times it is disassembled and ensure the concentricity of the die end. When in use, according to needs, first select a suitable barrel 6, open the electric cylinder 1 in the push rod driving mechanism 16, the electric cylinder 1 pulls the push rod 10 through the movable plate 11, so that the push rod 10 is separated from the barrel 6, and the electric cylinder 1 is closed; open the electric cylinder 2 in the core rod driving mechanism 17, and the electric cylinder 2 pulls the core rod 12 to the rear end position of the corresponding electric cylinder 2 through the sliding block 15, so that the core rod 12 is separated from the barrel 6, and the electric cylinder 2 is closed. Manually rotate the turntable 1 4 and the turntable 2 7 to turn the selected barrel 6 to the other side. If one end of the selected barrel 6 has been connected to the die head 20 through the die head fixing ring 21 (if the die head 20 is not installed, one end of the barrel 6 is connected to the matching die head 20 through the die head fixing ring 21), a polytetrafluoroethylene preform with a small clearance matching the inner diameter of the barrel 6 is added to the inner hole at the other end of the corresponding barrel 6 (the feeding end of each barrel 6 is facing the direction of the push rod 10, and the end hole at the feeding end of the barrel 6 can be set as a hole with a guiding slope to facilitate the preform to enter the barrel 6 and also facilitate the push rod 10. The outer diameter of the polytetrafluoroethylene preform is matched with the inner diameter of the barrel 6 with a small clearance to reduce the shaking of the polytetrafluoroethylene preform in the barrel 6. A through hole slightly larger than the outer diameter of the core rod 12 and extending along its length is provided in the middle of the polytetrafluoroethylene preform to facilitate the insertion of the core rod 12. After the polytetrafluoroethylene preform is successfully loaded into the barrel 6, the turntable 1 4 and the turntable 2 7 are rotated in the opposite direction to make the barrel 6 containing the polytetrafluoroethylene preform coaxially aligned with the push rod 10 and the core rod 12 (the alignment method can be manual alignment or auxiliary alignment can be performed by an alignment tool). The electric cylinder 2 in the core rod driving mechanism 17 is turned on again, and the electric cylinder 2 pushes the core rod 12 toward the barrel 6 through the sliding block 15. After reaching the preset stroke, the electric cylinder 2 is turned off. At this time, the core rod 12 has penetrated the through hole in the middle of the polytetrafluoroethylene preform in the barrel 6, and the core mold 22 at the front end of the core rod 12 is located on the inner side of the die head 20, and the core rod 223 on the core mold 22 has been inserted into the cylindrical hole of the die head 20.At this time, the electric cylinder 1 in the push rod driving mechanism 16 is turned on again. The electric cylinder 1 pushes the push rod 10 toward the barrel 6, and the piston 23 of the push rod 10 enters the barrel 6. The outer circle of the piston 23 slides in a sealed manner with the inner wall of the barrel 6. At this time, the axis of the piston 23 is aligned with the axis of the barrel 6. Since the axes of the piston 23, the core rod 12, the push rod 10, and the core mold 22 are located on the same straight line, the axis of the inner hole of the die head 20 and the axis of the inner hole of the barrel 6 are located on the same straight line, therefore, the axis of the core mold 22 and the axis of the die head 20 are located on the same straight line, and the core mold 22 is located at the center position of the die head 20, ensuring the concentricity of the polytetrafluoroethylene preform and the core mold 22, the piston 23 of the push rod 10 pushes the polytetrafluoroethylene preform in the barrel 6, the polytetrafluoroethylene preform enters the cavity between the die head 20 and the core mold 22, and then extrudes the medical multi-lumen tubing blank from the outlet of the die head 20, and then is sintered by the sintering device to finally form a product.

[0055] The turntable 1 4 and the turntable 2 7 are provided with circular perforations corresponding to the three barrels 6 and the rotating bearing shaft 5. The rotating bearing shaft 5 is located at the center of the turntable 1 4 and the turntable 2 7. The three barrels 6 are evenly distributed at an angle of 120° along the circumference of the turntable 1 4 and the turntable 2 7. At the same time, the three barrels 6 and the rotating bearing shaft 5 are all detachably connected to the turntable 1 4. The three barrels 6 and the rotating bearing shaft 5 are all detachably connected to the turntable 2 7, and the connection method can be bolt, key connection, pin connection, etc.

[0056] The movable plate 11 is an I-shaped hexahedron with a vertically symmetrical structure, and is provided with seven holes. Both the upper and lower parts have through holes that can ensure that the polished rod 9 can pass through.

[0057] In order to ensure that the 500kg motor of the electric cylinder 2 can smoothly push and pull the core rod 12 so that the two form a unified connection structure, a sliding block 15 is set at the rear end of the core rod 12 as a connection component. During use, turning on the 500kg motor can realize the horizontal movement of the core rod 12 in a direction parallel to its axis.

[0058] The electric cylinder 1 and the electric cylinder 2 are sealedly connected to the motor mounting plate 13 via a hexahedral cylinder front flange 14. Preferably, the hexahedral cylinder front flange 14 complies with the 135 cylinder front flange standard.

[0059] The 5T motor of the electric cylinder 1 is turned on to provide axial pushing force, which can push the movable plate 11 forward to move horizontally, so that the push rod 10 moves forward to extrude the polytetrafluoroethylene preform in the material cavity of the barrel 6 to prepare a multi-cavity tube blank.

[0060] The threaded area 221 in the core mold 22 is used to connect with the threaded hole at the end of the core rod 12. The conical area 222 is a necessary area for maintaining the shape of the pipe, and has a certain length and cone angle. The angle of the conical part of the conical area 222 is preferably 20°-60°, so as to guide the extruded polytetrafluoroethylene blank to flow in a certain direction. The lower part of the conical area 222 is fixedly connected with the core rod 223. The core rod 223 is a long straight pipe with an exhaust hole. The length of the core rod 223 is preferably 20-30% of the total length of the core mold 22. The gap between each core rod 223 is preferably 0.5-1mm. The number of core rods 223 is set to an even number, and the even number of core rods 223 is symmetrically distributed around the axis, thereby forming a symmetrical multi-cavity structure. In this embodiment, the threaded area 221 in the core mold 22 of different sizes can be threadedly connected with the threaded hole at the end of the core rod 12, and the outer diameter of the large diameter end of the conical area 222 is consistent with the outer diameter of the core rod 12. The core rod 12 is a long cylindrical rod.

[0061] Specifically, the mandrel 223 is provided with 12 pieces, and the following can be prepared: Figure 7 The medical twelve-lumen gas guide tube shown.

[0062] The medical multi-cavity air guide screen tube prepared by the utility model has at least the following advantages:

[0063] The multi-cavity tube provided by the embodiment of the utility model can be applied to the field of gas-guiding screen tubes at least. Because a horizontal extruder with a device for selecting a barrel 6 is used, materials can be added from three barrels 6 respectively to reduce disassembly. The outer diameter of the preform and the inner diameter of the barrel 6 are matched with a small gap to avoid the preform shaking in the barrel 6, improve the concentricity of the preform, and prevent the eccentricity caused by improper installation of the preform and the core mold 22. One end of the die head 20 is fixedly connected with the end of the barrel 6 by a die head fixing ring 21 with multiple through screw holes by bolts. Once installed, it can be repeatedly used many times. The multi-cavity screen tube finally prepared has good dimensional stability, uniform wall thickness, good concentricity, can be industrialized on a large scale, is easy to operate, saves time and effort, and has high production efficiency. In actual use, the die head assembly of appropriate size can also be replaced according to requirements, and the disassembly and assembly of the die head assembly is also simple and convenient. In addition, for barrels 6 with different inner diameters, the piston 23 on the push rod 10 can also be replaced (all replaced pistons 23 have slightly different outer diameters, the same inner diameters and the same size of the threaded end connected to the push rod, to achieve matching with the same core rod 12 and matching connection with the same push rod 10), ensuring that the piston 23 can be in sealed sliding contact with the inner wall of the barrel 6. In the overall structure of the utility model, some structures are connected by threads, bolts or nuts, etc., and installation and disassembly are simple and convenient. The molding method of the polytetrafluoroethylene preform is not within the protection scope of the utility model.

[0064] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be the protection scope of the claims.

Claims

1. A manufacturing device for a medical polytetrafluoroethylene multi-cavity gas-guiding screen tube, characterized in that: The invention comprises a horizontal extruder structure, wherein the horizontal extruder structure comprises a working plane (19), a multi-select barrel device, a push rod push-pull transmission component and a core rod push-pull transmission component; the multi-select barrel device, the push rod push-pull transmission component and the core rod push-pull transmission component are all arranged on the working plane (19); The working plane (19) is connected with a right end stopper (2), an upper fixing plate (8) and a motor mounting plate (13); The multi-select barrel device comprises a turntable 1 (4), a rotating bearing shaft (5), a turntable 2 (7) and a plurality of barrels (6); the front end of the rotating bearing shaft (5) is connected to the right end stopper (2), and the rear end is connected to the upper fixed plate (8); the center hole of the turntable 1 (4) and the center hole of the turntable 2 (7) are both rotatably connected to the rotating bearing shaft (5); the plurality of barrels (6) penetrate the turntable 1 (4) and the turntable 2 (7) and are connected to the turntable 1 (4) and the turntable 2 (7); the plurality of barrels (6) are arranged along the circumferential direction of the turntable 1 (4) and the turntable 2 (7); The push rod push-pull transmission component comprises a push rod driving mechanism (16), a movable plate (11) and a push rod (10); the upper fixed plate (8) and the motor mounting plate (13) are connected via a light rod (9); the movable plate (11) and the light rod (9) are slidably connected; the push rod driving mechanism (16) is connected to the motor mounting plate (13); the driving end of the push rod driving mechanism (16) is connected to the movable plate (11) and is used to push and pull the movable plate (11); the movable plate (11) is connected to the push rod (10); the push rod (10) passes through a through hole on the upper fixed plate (8) and the push rod (10) can slide in the through hole on the upper fixed plate (8); the push rod (10) is detachably connected with a piston (23); the piston (23) on the push rod (10) can be extended into the barrel (6) of the multi-select barrel device under the push of the movable plate (11); the piston (23) is in sealing sliding contact with the inner wall of the barrel (6); The core rod push-pull transmission component comprises a core rod driving mechanism (17), a core rod (12) and a die head assembly; the core rod driving mechanism (17) is connected to the motor mounting plate (13); the driving end of the core rod driving mechanism (17) is connected to the core rod (12) and is used to push and pull the core rod (12); an axial hole extending along the length direction of the push rod (10) is provided on the push rod (10); the core rod (12) passes through the axial hole of the push rod (10) and the through hole on the piston (23); and the core rod (12) can slide in the axial hole of the push rod (10) and the through hole on the piston (23); the die head assembly comprises a die head (20), a die head fixing ring (21) and a core mold (22); the die head (20) is detachably connected to the barrel (6) of the multiple-selection barrel device through the die head fixing ring (21); and the core mold (22) is detachably connected to the core rod (12); The axes of the core rod (12), the push rod (10), the piston (23) and the core mold (22) are located on the same straight line, and the axes of the inner hole in the die head (20) and the inner hole in the barrel (6) are located on the same straight line.

2. The manufacturing device of the medical polytetrafluoroethylene multi-cavity gas-guiding screen tube according to claim 1 is characterized in that: The front end of the rotating load-bearing shaft (5) is connected to the right end stopper (2) via the load-bearing shaft fixing block (3), and the load-bearing shaft fixing block (3) and the right end stopper (2) are connected via bolts; the rear end of the rotating load-bearing shaft (5) is connected to the upper fixing plate (8) via the load-bearing shaft fixing block (3), and the load-bearing shaft fixing block (3) and the upper fixing plate (8) are connected via bolts.

3. The manufacturing device of the medical polytetrafluoroethylene multi-cavity gas-guiding screen tube according to claim 1 is characterized in that: The plurality of barrels (6) include a barrel with a diameter of 40 mm, a barrel with a diameter of 45 mm and a barrel with a diameter of 50 mm, and the lengths of the barrels are all 90 cm.

4. The manufacturing device of the medical polytetrafluoroethylene multi-cavity gas-guiding screen tube according to claim 1 is characterized in that: The plurality of barrels (6) are used for adding polytetrafluoroethylene preforms, and the outer circle of the polytetrafluoroethylene preforms is gap-matched with the inner wall of the barrel (6).

5. The manufacturing device of the medical polytetrafluoroethylene multi-cavity gas-guiding screen tube according to claim 1, characterized in that: There are two push rod drive mechanisms (16), and the driving ends of the two push rod drive mechanisms (16) are both inserted through the reserved through holes on the motor mounting plate (13) and are locked and connected with the movable plate (11) through nuts. The movable plate (11) is threadedly connected to one end of the push rod (10), and the other end of the push rod (10) is threadedly connected to the piston (23).

6. The manufacturing device of the medical polytetrafluoroethylene multi-cavity gas-conducting screen tube according to claim 1, characterized in that: There are two core rod driving mechanisms (17), the driving ends of the two core rod driving mechanisms (17) are inserted through the reserved through holes on the motor mounting plate (13) and are locked and connected to the sliding block (15) through a nut, one end of the core rod (12) is inserted through the through hole in the middle of the motor mounting plate (13) and is connected to the sliding block (15) through a core rod fixing block, the core rod (12) is slidably connected to the through hole in the middle of the motor mounting plate (13), the core rod fixing block is connected to the sliding block (15) through bolts, and the core rod (12) is slidably and sealedly connected to the through hole on the piston (23).

7. The manufacturing device of the medical polytetrafluoroethylene multi-cavity gas-conducting screen tube according to claim 6, characterized in that: The core rod (12) is made of 304 stainless steel; the push rod driving mechanism (16) is made of electric cylinder 1, which is connected to the motor mounting plate (13) through a cylinder front flange (14) and bolts; the core rod driving mechanism (17) is made of electric cylinder 2, which is connected to the motor mounting plate (13) through a cylinder front flange (14) and bolts.

8. The manufacturing device of the medical polytetrafluoroethylene multi-cavity gas-conducting screen tube according to claim 1, characterized in that: The die head fixing ring (21) is connected to the barrel (6) via bolts, and the core mold (22) is located in the inner cavity of the die head (20).

9. The manufacturing device of the medical polytetrafluoroethylene multi-cavity gas-guiding screen tube according to claim 1, characterized in that: The core mold (22) comprises a threaded area (221), a conical area (222) and a plurality of core rods (223); the threaded area (221), the conical area (222) and the plurality of core rods (223) are fixedly connected in sequence; the threaded area (221) is threadedly connected to an end hole on the core rod (12).

10. The manufacturing device of the medical polytetrafluoroethylene multi-cavity gas-conducting screen tube according to claim 9, characterized in that: The number of the core rods (223) is an even number, the length of the core rods (223) is 20-30% of the total length of the core mold (22), and the gap between each core rod (223) is 0.5-1 mm.

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