Extrusion forming die for medical multi-cavity tube

Abstract

The utility model relates to a medical multi-cavity tube extrusion molding die, which comprises a die core and a die orifice sleeved on the die core, the die core comprises a molding head and a mounting seat detachably connected with the molding head, a flow channel is arranged between the molding head and the die orifice, the molding head comprises a molding part, and the molding part is provided with a flow channel. The die orifice and the forming part jointly define a cavity communicated with the runner, an exhaust hole is formed in the forming part, and an exhaust channel which can be communicated with the exhaust hole when the forming head is mounted on the mounting seat is arranged on the mounting seat. The multi-cavity pipe forming die has the advantages that the exhaust holes are formed in the forming head, so that the problems that when a traditional die is used for manufacturing a multi-cavity pipe, due to internal air pressure in the cooling and curing process of molten plastic, the pipe is deformed, the inner wall is uneven or bubbles are generated are solved; the mounting seat is detachably connected with the forming head, and the exhaust passage is arranged on the mounting seat, so that hot air entering the exhaust hole can be smoothly exhausted out of the mold while the universality and the flexibility of the mold are improved, and the stability of the mold in the using process is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of multi - cavity tube extrusion molding, and particularly relates to a medical multi - cavity tube extrusion molding die.

Background Art

[0002] Nowadays, the medical multi - cavity tube extrusion molding die is a key device for producing medical consumables such as multi - channel infusion tubes. By uniformly filling the molten medical polymer material into the cavity of the die, and then cooling and shaping to form the required multi - cavity tube structure.

[0003] However, in the existing medical multi - cavity tube extrusion molding process, there will be hot air in the inner cavity of the preliminarily formed multi - cavity tube. If this part of the hot air cannot be discharged in time, internal air pressure will be generated in the subsequent cooling and solidification stage, resulting in deformation and other bad phenomena after the multi - cavity tube is formed, seriously affecting the product quality and service performance of the medical multi - cavity tube.

Content of the Utility Model

[0004] The purpose of the utility model is to provide a medical multi - cavity tube extrusion molding die to solve the above problems.

[0005] To solve the above - mentioned technical problems, the utility model provides the following technical solution: A medical multi - cavity tube extrusion molding die, including a die core and a die orifice sleeved on the die core. The die core includes a forming head and a mounting seat detachably connected to the forming head. A runner is provided between the forming head and the die orifice. The forming head includes a forming part. The die orifice and the forming part jointly enclose a cavity communicating with the runner. The forming part is provided with exhaust holes, and the mounting seat is provided with an exhaust channel that can communicate with the exhaust holes when the forming head is installed on the mounting seat.

[0006] As a further optimized solution of the utility model, the forming part includes a central forming column and circumferential forming columns arranged around the central forming column. The circumferential forming columns include large - hole forming columns and small - hole forming columns. Exhaust holes are provided on the large - hole forming columns, small - hole forming columns, and the central forming column.

[0007] As a further optimized solution of the utility model, both the central forming column and the small - hole forming column are cylinders, and the diameter of the central forming column is greater than the diameter of the small - hole forming column.

[0008] As a further optimized solution of the utility model, the large - hole forming column includes a first forming column and a second forming column that are symmetric about the left and right.

[0009] As a further optimized solution of the utility model, the shapes of the first forming column and the second forming column are both crescent - shaped.

[0010] As a further optimization solution of the present utility model, an exhaust groove communicating with all the exhaust holes is further provided on the forming head. The exhaust groove can jointly form an exhaust cavity with the mounting seat when the forming head is installed on the mounting seat, and the exhaust channel is communicated with the exhaust cavity.

[0011] As a further optimization solution of the present utility model, the apertures of the exhaust holes on the large-hole forming column, the small-hole forming column, and the central forming column are all equal.

[0012] As a further optimization solution of the present utility model, the mounting seat is in a frustum shape, and the small end of the frustum is close to the forming part.

[0013] As a further optimization solution of the present utility model, a connecting column is provided on the upper part of the mounting seat.

[0014] As a further optimization solution of the present utility model, the outer wall of the connecting column is provided with threads, and the outer wall of the mounting seat is provided with a jaw guiding surface.

[0015] Compared with the prior art, the present utility model has the following advantages: By arranging the exhaust holes on the forming head, it solves the problems such as the deformation of the pipe, the uneven inner wall, or the generation of bubbles caused by the internal air pressure during the cooling and solidification process of the molten plastic when the traditional mold is used to make multi-cavity pipes; The detachable connection between the mounting seat and the forming head, as well as the arrangement of the exhaust channel provided on the mounting seat, while improving the versatility and flexibility of the mold, enables the hot air entering the exhaust holes to be smoothly discharged outside the mold, ensuring the stability during the use of the mold.

Description of the Drawings

[0016] The following further describes in detail the specific embodiments of the present utility model with reference to the drawings, where:

[0017] Figure 1 is the three-dimensional schematic diagram of the present utility model;

[0018] Figure 2 is the exploded schematic diagram of the present utility model;

[0019] Figure 3 is the three-dimensional schematic diagram of the mold core in the present utility model;

[0020] Figure 4 is the sectional schematic diagram of the present utility model.

Specific Embodiments

[0021] The following describes in detail the embodiments of the present utility model with reference to the drawings.

[0022] Such as Figures 1 to 4As shown in the figure, the utility model discloses a medical multi-cavity tube extrusion molding die, which includes a die core 1 and a die orifice 2 sleeved on the die core 1. The die core 1 includes a forming head 11 and a mounting seat 12 detachably connected to the forming head 11. A runner 3 is provided between the forming head 11 and the die orifice 2. The forming head 11 includes a forming part 111. The die orifice 2 and the forming part 111 jointly enclose a cavity 8 communicated with the runner 3. An exhaust hole 7 is provided on the forming part 111. An exhaust passage 121 is provided on the mounting seat 12, which can be communicated with the exhaust hole 7 when the forming head 11 is installed on the mounting seat 12.

[0023] The die orifice 2 is sleeved outside the die core 1 and jointly constitutes the main body part of the die with the die core 1. A runner 3 is formed between the die orifice 2 and the die core 1, ensuring that the molten material can enter the cavity 8 evenly and continuously, so as to form the required multi-cavity tube structure. The forming head 11 is the key part of the die core 1, and its forming part 111 directly determines the specific shape and dimensional accuracy of the multi-cavity tube. An exhaust hole 7 is provided on the forming part 111. Through the setting of the exhaust hole 7, after the molten material is extruded and formed through the cavity 8, the hot air in the inner cavity of the multi-cavity tube can be discharged in time, avoiding the deformation of the pipe caused by the pressure generated by the compression of the gas or the generation of bubbles, and improving the quality and stability of the multi-cavity tube finished product. The mounting seat 12 is detachably connected to the forming head 11, which is convenient for maintaining the forming head 11 and reduces the die replacement cost. An exhaust passage 121 communicated with the exhaust hole 7 on the forming head 11 is provided on the mounting seat 12, so that the hot air can flow more smoothly from the inner cavity of the multi-cavity tube to the outside of the die.

[0024] By setting the exhaust hole 7 on the forming head 11, problems such as the deformation of the pipe, uneven inner wall or generation of bubbles caused by the internal air pressure during the cooling and solidification of the molten plastic when making multi-cavity tubes with traditional dies are solved; the detachable connection between the mounting seat 12 and the forming head 11 and the setting of the exhaust passage 121 on the mounting seat 12 improve the versatility and flexibility of the die, and at the same time enable the hot air entering the exhaust hole 7 to be discharged smoothly outside the die, ensuring the stability during the use of the die.

[0025] The forming part 111 includes a central forming column 41 and circumferential forming columns 42 arranged around the central forming column 41. The circumferential forming columns 42 include large-hole forming columns 421 and small-hole forming columns 422. Exhaust holes 7 are provided on the large-hole forming columns 421, small-hole forming columns 422 and the central forming column 41.

[0026] By providing the central forming column 41 and the circumferential forming column 42, the inner cavities of the multi-lumen tube can be arranged in a circular pattern, making full use of the space within the tube. The large-hole forming column 421 and the small-hole forming column 422 are provided on the circumferential forming column 42, thereby manufacturing a tube with chambers of various inner diameter specifications, allowing users to select different-sized inner cavities according to requirements such as infusion tubes and urinary catheters to meet different clinical application scenarios. By providing exhaust holes 7 on the central forming column 41, the large-hole forming column 421, and the small-hole forming column 422, it is ensured that the hot air generated in each inner cavity of the multi-lumen tube can be discharged in a timely and effective manner, preventing the tube from deforming due to hot air.

[0027] Both the central forming column 41 and the small-hole forming column 422 are cylindrical, and the diameter of the central forming column 41 is greater than the diameter of the small-hole forming column 422.

[0028] By providing that both the central forming column 41 and the small-hole forming column 422 are cylindrical, the corresponding inner cavities of the multi-lumen tube produced by the central forming column 41 and the small-hole forming column 422 are circular tubes. The fact that the diameter of the central forming column 41 is greater than the diameter of the small-hole forming column 422 enables the inner cavity diameter corresponding to the central forming column 41 to be larger than the inner cavity diameter corresponding to the small-hole forming column 422. Compared with the case where the inner cavity diameter corresponding to the central forming column 41 is smaller than the inner cavity diameter corresponding to the small-hole forming column 422, when catheters are inserted into the inner cavities corresponding to both the large-hole forming column 421 and the small-hole forming column 422, it is convenient for users to insert the catheter into the inner cavity corresponding to the central forming column 41.

[0029] The large-hole forming column 421 includes a first forming column 51 and a second forming column 52 that are symmetric about the left and right.

[0030] By providing the left-right symmetric first forming column 51 and second forming column 52, the inner cavity structure formed during the extrusion process is symmetric, which is crucial for producing medical tubes with symmetric multi-lumen structures such as double-lumen infusion tubes and double-channel catheters. At the same time, symmetry also helps to ensure the consistency and stability of the inner and outer diameters of the tube.

[0031] Both the first forming column 51 and the second forming column 52 are crescent-shaped.

[0032] The crescent-shaped design can make more effective use of the space inside the mold, enabling a larger cavity or channel to be formed within a limited space to meet the specific large-aperture requirements of the multi-lumen tube. At the same time, the crescent shape is conducive to gas flow, allowing hot air to be discharged more smoothly, thereby reducing the generation of bubbles and the problem of tube deformation caused by gas pressure. The crescent-shaped setting makes the finally extruded large-hole part have good mechanical properties, which is beneficial to improving the overall quality and service life of the medical multi-lumen tube.

[0033] An exhaust groove 112 that is also in communication with all the exhaust holes 7 is provided on the forming head 11. When the forming head 11 is installed on the mounting seat 12, the exhaust groove 112 and the mounting seat 12 can jointly enclose an exhaust cavity 6, and the exhaust passage 121 is in communication with the exhaust cavity 6.

[0034] The exhaust cavity 6 formed when the forming head 11 is combined with the mounting seat 12 can provide a temporary storage area for the internal gas and quickly discharge it, which is beneficial to maintaining the pressure stability in the mold cavity, ensuring the wall thickness uniformity and structural integrity of all parts of the multi-cavity tube. At the same time, the exhaust passage 121 is directly connected to the exhaust cavity 6, making the entire exhaust process smoother and easier to control. The integrated design of the exhaust cavity 6 and the exhaust passage 121 can also improve the integrity of the mold, facilitate the cleaning and maintenance of the mold, and extend the service life of the mold.

[0035] The diameters of the exhaust holes 7 on the large-hole forming column 421, the small-hole forming column 422, and the central forming column 41 are all equal.

[0036] The setting that the diameters of the exhaust holes 7 on the large-hole forming column 421, the small-hole forming column 422, and the central forming column 41 are all equal is beneficial to the standardized and batch production during the mold manufacturing process.

[0037] The mounting seat 12 is in the shape of a frustum of a cone, and the small end of the frustum is close to the forming part 111.

[0038] The design of the frustum-shaped mounting seat 12 with its small end close to the forming part 111 enables the molten material to flow smoothly along the taper direction when in the runner 3, avoiding problems such as insufficient filling caused by uneven pressure or flow resistance.

[0039] A connecting column 122 is provided on the upper part of the mounting seat 12.

[0040] Through the design of the connecting column 122, the mold core 1 can be accurately and firmly fixed on the equipment main body, ensuring that the mold will not be displaced due to factors such as uneven force or vibration during the extrusion molding process, and guaranteeing the stability of the molding process.

[0041] External threads 123 are provided on the outer wall of the connecting column 122, and a jaw guiding surface 124 is provided on the outer wall of the mounting seat 12.

[0042] The outer wall of the connecting column 122 is provided with a thread 123, and external devices can be screwed into this connecting column through an internal thread interface to achieve convenient and firm mechanical connection. The outer wall of the mounting seat 12 is provided with a jaw guiding surface 124, which facilitates precise installation and disassembly operations using special tools such as chucks, jigs or pliers. The setting of the jaw guiding surface 124 can provide a stable contact point, enabling better control of the direction and magnitude of the force during the assembly process, and avoiding displacement or damage of the mounting seat 12 due to improper operation.

Claims

1. A medical multi-lumen tube extrusion molding die, characterized in that: The invention comprises a mold core (1) and a mold opening (2) sleeved on the mold core (1); the mold core (1) comprises a molding head (11) and a mounting seat (12) detachably connected to the molding head (11); a flow channel (3) is provided between the molding head (11) and the mold opening (2); the molding head (11) comprises a molding portion (111); the mold opening (2) and the molding portion (111) together form a mold cavity (8) connected to the flow channel (3); an exhaust hole (7) is provided on the molding portion (111); and an exhaust channel (121) is provided on the mounting seat (12) and can be connected to the exhaust hole (7) when the molding head (11) is mounted on the mounting seat (12).

2. The medical multi-lumen tube extrusion molding die according to claim 1, characterized in that: The molding portion (111) comprises a central molding column (41) and circumferential molding columns (42) arranged around the central molding column (41), wherein the circumferential molding columns (42) comprise large-hole molding columns (421) and small-hole molding columns (422), and exhaust holes (7) are provided on the large-hole molding columns (421), the small-hole molding columns (422), and the central molding column (41).

3. A medical multi-lumen tube extrusion molding die according to claim 2, characterized in that: The central forming column (41) and the small hole forming column (422) are both cylinders, and the diameter of the central forming column (41) is greater than the diameter of the small hole forming column (422).

4. The medical multi-lumen tube extrusion molding die according to claim 2, characterized in that: The macroporous forming column (421) comprises a first forming column (51) and a second forming column (52) which are bilaterally symmetrical.

5. The medical multi-lumen tube extrusion molding die according to claim 4, characterized in that: The first forming column (51) and the second forming column (52) are both crescent-shaped.

6. The medical multi-lumen tube extrusion molding die according to claim 2, characterized in that: The molding head (11) is also provided with an exhaust groove (112) which is in communication with the exhaust hole (7); the exhaust groove (112) can enclose an exhaust cavity (6) together with the mounting seat (12) when the molding head (11) is mounted on the mounting seat (12); and the exhaust channel (121) is in communication with the exhaust cavity (6).

7. The medical multi-lumen tube extrusion molding die according to claim 6, characterized in that: The diameters of the exhaust holes (7) on the large-pore forming column (421), the small-pore forming column (422), and the central forming column (41) are all equal.

8. The medical multi-lumen tube extrusion molding die according to claim 1, characterized in that: The mounting seat (12) is in the shape of a frustum, and the small end of the frustum is close to the forming portion (111).

9. The medical multi-lumen tube extrusion molding die according to claim 1, characterized in that: A connecting column (122) is provided on the upper portion of the mounting seat (12).

10. The medical multi-lumen tube extrusion molding die according to claim 9, characterized in that: The outer wall of the connecting column (122) is provided with a thread (123), and the outer wall of the mounting seat (12) is provided with a jaw guide surface (124).

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