TWI684469B - Die head device of developing tube - Google Patents

Abstract

A die device for a developing tube includes a co-extrusion unit and a shaping unit. The shaping unit includes an outer mold base, a mold core disposed in the outer mold base, and a mold flow nozzle inserted on the mold core and surrounding a cashew-shaped mold mouth. The outer mold base and the mold core define an annular groove. The mold core has a receiving portion, a cone portion, and a port portion, and the cone portion is recessed to form a guide groove. The design of the gap between the die and the cone and the inward depression of the guide groove allows part of the substrate to flow to the inside of the die, thereby enabling the substrate to be coated with developed plastic from both the inside and outside; on the other hand The shape of the cashew nut of the die is consistent with the tubular cross-section of the base material, which reduces the difficulty of alignment and improves the fault tolerance rate, thereby improving the quality of the developed developing tube.

Description

Die head device of developing tube

The invention relates to a die head, in particular to a die head device for shaping a developing tube in the manufacturing process of the developing tube.

Referring to FIG. 1, the developing tube 1 is a medical device, and includes a transparent tube 11 and a developing plastic 12 embedded in the tube 11 and extending along the axial direction of the tube 11. The main function of the developing tube 1 is to allow medical personnel to recognize the position of the tube body through the developing plastic 12 when using an X-ray machine. In order to prevent the developing plastic 12 from contacting the human body or drugs, the developing plastic 2 needs to be wrapped in the tube body 11 in a strip-like manner.

Referring to FIGS. 1 and 2, the manufacturing line 2 of the developing tube 1 includes an extruder 21 for melting the substrate and developing the plastic 12 and providing pressure according to the manufacturing process sequence, a substrate output from the extruder 21 and the like The developing plastic 12 is shaped into a die 22 of the developing tube 1, a vacuum setting device 23 for shaping the developing tube 1 by vacuum, a cooling device 24 for cooling the developing tube 1, and a drawing device for taking out the developing tube 2 Extraction device 25, and a cutting device 26 for cutting the developing tube 1.

Referring to FIG. 1, FIG. 3, and FIG. 4, the general die head 22 includes an outer mold base 221 (shown in FIG. 3, not shown in FIG. 4), and a cone shape disposed in the outer mold base 221 A mold core 222, and a mold flow nozzle 224 inserted at the maximum outer diameter of the mold core 222 and surrounding a circular hole-shaped discharge port 223. The outer mold base 221 is arranged coaxially with the mold core 222 and an annular groove 225 for substrate input is spaced in the radial direction. The discharge port 223 communicates with the annular groove 225 and inputs the developing plastic 12. The base material is plastically formed in the annular groove 225 to form a tube-shaped tube body 11, and the developing plastic 12 is mixed into the tube body 11 through the discharge port 223, so that the developing plastic 12 is coated on the tube wall of the tube body 11 in.

However, since the outer diameter of the die core 222 gradually decreases along the output direction of the substrate, when the substrate is input into the annular groove 225, the flow potential and the outer surface of the die core 222 hinder the flow, and it is not easy to flow To the inside of the developing plastic 12 input from the largest outer diameter, plus the developing plastic 12 is easily compressed inward by the tapered outer diameter base material, forcing the developing plastic 12 to move inward, resulting in the shaped developed plastic 12 easily The inner surface of the tube body 11 is exposed, that is, the tube body 11 cannot completely cover the developing plastic 12. In addition, the discharge port 223 of the round hole shape will make the output developing plastic 12 take the shape of a round bar. In this way, the outer diameter of the developing plastic 12 needs to be smaller than the wall thickness of the tube body 11 to be covered by the tube body 11, If the outer diameter of the developing plastic 12 is too large or shifted, it will cause the developing plastic 12 to be exposed on the surface of the tube body 11, thereby causing safety concerns.

Therefore, the object of the present invention is to provide a die device that can completely cover the developing plastic with the base material.

Therefore, the die device of the developing tube of the present invention is used to co-extrude a base material and a developing plastic to form a developing tube. The die device includes a co-extrusion extruding unit and a shaping unit. The co-extrusion extrusion unit includes a substrate extrusion machine for supplying the substrate, and a development plastic extrusion machine for supplying the development plastic.

The shaping unit includes an outer mold base, a mold core disposed in the outer mold base, and a mold flow nozzle inserted on the mold core, the outer mold base and the mold core are spaced apart to define an annular shape Groove, the die core has a receiving portion, a tapered portion extending from the receiving portion in a discharge direction and gradually decreasing in outer diameter, and a port portion extending from the tapered portion in the discharge direction, the cone The body portion is recessed to form a guide groove that is adjacent to the port portion compared to the receiving portion, the mold nozzle has a connection end connected to the cone portion and located in the guide groove, and a connection end opposite to the connection end and the The discharge ends of the cones are spaced apart, the connecting end communicates with the developing plastic extruder, the discharge end surrounds a cashew-shaped die, and the annular groove communicates with the substrate extruder and the die and is used to The developing tube is output in the discharging direction.

The effect of the present invention is that the die-flow nozzle is located at a position where the outer diameter of the cone portion is small, which can reduce the pressure of the substrate squeezing inward, the discharge end is spaced from the cone portion and the guide groove is recessed inward The design of the substrate allows part of the substrate to flow to the inside of the die, thereby enabling the substrate to be coated with developed plastic from both the inside and outside; on the other hand, the shape of the cashew nut of the die matches the tubular cross-section of the substrate, reducing Alignment difficulty and error tolerance are improved, thereby improving the quality of the developed developing tube.

5, 6, and 7, one embodiment of the die device 3 of the developing tube of the present invention includes a co-extrusion extruding unit 4 and a shaping unit 5 connected to the co-extrusion extruding unit 4. The co-extrusion extrusion unit 4 includes a substrate extrusion machine 41, a developing plastic extrusion machine 42, a charging mechanism 43 connected to the substrate extrusion machine 41, and a partial extrusion mechanism 43 connected to the extrusion mechanism 43 The outer sleeve 44 and a feeding pipe 45 connected to the developing plastic extruder 42 and passing through the charging mechanism 43. The charging mechanism 43 has a material guide 431 connected to the substrate extruder 41 and having a plurality of feed lines 430 connected to the substrate extruder 41, and a material guide 431 connected to the material guide 431 and along a discharge direction A screw 432 extending into the outer sleeve 44. The screw 432 has a seat body portion 433 connected between the material guide seat 431 and the outer sleeve 44 and communicating with the feed pipes 430, and a seat body portion 433 extending along the discharge direction A to A plurality of screw grooves 434 are formed in the outer sleeve 44 on the outer circumferential surface, and a protruding ring portion 436 protruding on the shaft body 435 and located in front of the screw grooves 434 along the discharge direction A . The screw grooves 434 extend spirally along the discharge direction A and are respectively connected to the feed pipes 430 through the seat body portion 433. The feeding pipe 45 passes through the material guide 431, the screw 432, and the shaping unit 5 in this order

The shaping unit 5 includes a bearing 51 connected to the outer sleeve 44 and an outer mold fixed by the bearing 51 to the outer sleeve 44 and passing through the bearing 51 along the discharge direction A A base 52, a mold core 53 disposed at the end of the rod body portion 435 and located in the outer mold base 52, a mold flow nozzle 54 inserted on the mold core 53 and connected to the feed pipe 45, and a set A support base 55 between the mold core 53 and the mold flow nozzle 54. The bearing 51 and the seat body portion 433 are located at opposite ends of the outer sleeve 44 respectively, and are respectively fixed to the outer sleeve 44 through locking members such as screws. The outer mold base 52 is fixed to the outer sleeve 44 by the bearing base 51, and is spaced apart from the inside and outside of the mold core 53 to define an annular groove 521 communicating with the screw grooves 434. The die core 53 has a receiving portion 531 penetrated by the feed pipe 45, a tapered portion 532 extending from the receiving portion 531 along the discharge direction A and gradually decreasing in outer diameter, and a tapered portion 532 is a port portion 533 extending in the discharge direction A. The taper portion 532 is recessed to form a guide groove 534 that is adjacent to the port portion 533 and is provided for the support base 55 compared to the receiving portion 531. The mold nozzle 54 has a connection end 541 connected to the cone portion 532 and located in the guide groove 534, and a discharge end 542 opposite to the connection end 541 and spaced from the cone portion 532. The connecting end 541 is connected to the feed pipe 45 through which the receiving portion 531 is inserted. The outlet 542 surrounds a die 543 which is cashew-shaped and communicates with the annular groove 521. The support base 55 is used to support the mold flow nozzle 54 not only to space the discharge end 542 from the cone portion 532, but also to enhance the overall structural strength.

Referring to FIGS. 5, 7, and 8, when this embodiment is in operation, the substrate extruder 41 will output the molten substrate along the discharge direction A, and the substrate enters the feed pipes of the material guide 431 After 430, the screw grooves 434 are fed and blocked by the protruding ring portion 436, and the substrate blocked by the protruding ring portion 436 will pass the protruding ring portion 436 due to the pushing force of the substrate that continues to be fed back And, the base material that has passed the convex ring portion 436 has been shaped into a circular tube shape from a cylindrical shape, and continues into the annular groove 521. The base material entering the annular groove 521 is tapered inwardly along the cone portion 532 and moves in the annular groove 521. When passing through the mold nozzle 54, part of the base material flows into the die opening 543 from the guide groove 534 Inside, on the other hand, the developed plastic output by the developing plastic extruder 42 will enter the mold flow nozzle 54 along the feed line 45, and finally be ejected from the die opening 543 and covered by the base material 61得Developed tube 6 as shown in Figure 8. Since the die nozzle 54 is located at a place where the outer diameter of the cone portion 532 is small, the force of the substrate 61 to squeeze the developing plastic 62 inward is small, and the guide groove 534 is recessed inward, and the discharge end 542 and The spaced design between the cone portions 532 allows part of the base material 61 to flow to the inner side of the die opening 543, so that the developing plastic 62 can be coated inside and outside to prevent the developing plastic 62 from being exposed outside the base material 61. In addition, the shape of the die 543 makes the cross-sectional area of the developed developing plastic 62 have a cashew shape, which is consistent with the tubular cross-section of the base material 61 and can extend in the circumferential direction of the base material 61 to have a larger Not only can the width of the developing plastic 62 be reduced to improve the fault tolerance, but also the recognition of the developing plastic 62 on the developing tube 6 can be increased.

In summary, in the present invention, by adjusting the position of the mold nozzle 54, the shape of the die opening 543, and the guide groove 534 formed on the outer surface of the cone portion 532, the base material 61 can be moved from the inside to the outside The developing plastic 62 is coated, and the developing plastic 62 can be positioned in the tube wall of the base material 61 to prevent the developing plastic 62 from being exposed and improve the quality of the developing tube 6, so the purpose of the invention can indeed be achieved.

However, the above are only examples of the present invention, and should not be used to limit the scope of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as This invention covers the patent.

3‧‧‧ Die head device 4‧‧‧Co-extrusion unit 41‧‧‧Substrate extrusion machine 42‧‧‧Developed plastic extruder 43‧‧‧ Feeding agency 430‧‧‧Through pipe 431‧‧‧Guide base 432‧‧‧screw 433‧‧‧Body 434‧‧‧Slot 435‧‧‧Body 436‧‧‧Convex ring 44‧‧‧Outer sleeve 45‧‧‧Feeding pipeline 5‧‧‧Shaping unit 51‧‧‧Seat 52‧‧‧External mold base 521‧‧‧Annular groove 53‧‧‧ mold heart 531‧‧‧ Undertaking Department 532‧‧‧Cone 533‧‧‧Port Department 534‧‧‧Guide groove 54‧‧‧mold nozzle 541‧‧‧Connector 542‧‧‧Discharge end 543‧‧‧ Die mouth 55‧‧‧Support 6‧‧‧Developing tube 61‧‧‧ Base material 62‧‧‧Developed plastic A‧‧‧Discharging direction

Other features and functions of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a perspective view illustrating a conventional developing tube; 2 is a schematic diagram illustrating a conventional manufacturing line of the conventional developing tube; 3 is an incomplete side cross-sectional view illustrating a die in the conventional manufacturing line; FIG. 4 is a perspective view illustrating one die core of the conventional die head; 5 is an exploded perspective view illustrating an embodiment of the die device of the developing tube of the present invention; 6 is a side cross-sectional view illustrating the combination relationship between the components of FIG. 5; 7 is a perspective view illustrating one of the mold cores in this embodiment; and FIG. 8 is a perspective view illustrating a developing tube manufactured in this embodiment.

5‧‧‧Shaping unit

53‧‧‧ mold heart

531‧‧‧ Undertaking Department

532‧‧‧Cone

533‧‧‧Port Department

534‧‧‧Guide groove

54‧‧‧mold nozzle

541‧‧‧Connector

542‧‧‧Discharge end

543‧‧‧ Die mouth

55‧‧‧Support

A‧‧‧Discharging direction

Claims (6)

A die device for a developing tube is used to co-extrude a base material and a developing plastic to make a developing tube. The die device includes: A total of extrusion extrusion unit, including a substrate extrusion machine for supplying the substrate, and a development plastic extrusion machine for supplying the development plastic; and A shaping unit includes an outer mold base, a mold core disposed in the outer mold base, and a mold flow nozzle inserted in the mold core, the outer mold base and the mold core are spaced apart to define a ring Shaped groove, the die core has a receiving portion, a tapered portion extending from the receiving portion in a discharge direction and gradually decreasing in outer diameter, and a port portion extending from the tapered portion in the discharge direction, the The cone portion is recessed to form a guide groove adjacent to the port portion of the receiving portion, the mold nozzle has a connection end connected to the cone portion and located in the guide groove, and an opposite end to the connection end and with The discharge ends of the cone parts are connected to the developing plastic extruder. The discharge end surrounds a cashew-shaped die. The annular groove communicates with the substrate extruder and the die and is used for The developing tube is output in the discharge direction. The die device of the developing tube according to claim 1, wherein the shaping unit further includes a support seat connected between the taper portion and the discharge end of the mold flow nozzle, the support seat being located in the guide groove . The die head device for a developing tube according to claim 1, wherein the co-extrusion extruding unit further includes a feeding pipe whose two ends are respectively connected to the die opening of the developing plastic extruder and the die flow nozzle. The die device of the developing tube according to claim 3, wherein the co-extrusion and extrusion unit further includes an outer sleeve connected to the shaping unit, and a base provided in the outer sleeve and connected to the substrate at both ends The extruder and the material feeding mechanism of the annular groove are provided for the material feeding pipe to pass through, and are used to shape the cylindrical base material into a tubular shape in cooperation with the outer sleeve. The die device of the developing tube according to claim 4, wherein the charging mechanism of the co-extrusion extruding unit has a material guide seat connected to the substrate extruder and having a plurality of feed lines connecting the substrate extruder , And a screw connecting the material guide and the outer sleeve and partially extending into the outer sleeve, the screw has a seat body portion connected between the material guide and the outer sleeve, a The seat body portion extends along the discharge direction and a plurality of screw grooves are formed on the outer circumferential surface, and a convex ring portion protrudingly provided on the rod body portion and located in front of the screw grooves along the discharge direction, the The equal screw grooves spirally extend along the discharge direction and are respectively connected to the feed pipes. The die device of the developing tube as described in claim 5, wherein the feed tube extends through the developing plastic extruder, and passes through the material guide, the screw, and the receiving portion of the die core in sequence, and finally connects to the The connection end of the mold flow nozzle.

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