Thermoplastic polymer pipe reducing and thinning mold and equipment thereof

Abstract

The utility model relates to a thermoplastic polymer pipe variable-diameter thinning mould and equipment capable of ensuring the shape of a conical end part, which comprises a first module and a second module, a first mould cavity of the first module comprises a first equal-diameter pipe cavity, a first conical pipe cavity and a first connecting cavity between the first equal-diameter pipe cavity and the first conical pipe cavity; a second die cavity of the second die set comprises a second equal-diameter pipe cavity, a second taper pipe cavity and a second connecting cavity between the second equal-diameter pipe cavity and the second taper pipe cavity, the inner diameter of the second equal-diameter pipe cavity is larger than the inner diameter of the first equal-diameter pipe cavity and smaller than the outer diameter of the pipe, the die cavity comprises an equal-diameter cavity and a taper pipe cavity, and the taper of the taper pipe cavity is consistent with the taper of the taper end of a finished balloon product. And the shape and the taper of the end part of the blastocyst can be kept while the pipes at the two ends of the blastocyst are thinned. Meanwhile, the conical end part of the balloon embryo can be heated and stretched when being positioned in the conical tube cavity, and after the step, the end part even does not need to be stretched and shaped independently, but only needs to be shaped together with the whole balloon, so that the processing technology is simplified, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical device production equipment, in particular to a thermoplastic polymer pipe diameter-changing and thinning die and equipment thereof. Background Art

[0002] Intraaortic balloon pump (IABP) is a treatment method in which a balloon is inserted between the descending aorta and the renal artery through femoral artery puncture. It is driven and controlled by an intraaortic balloon pump, inflated during diastole, and deflated at the end of diastole, thereby increasing coronary artery perfusion and reducing cardiac load. As an important component of the IABP balloon catheter, the performance of the balloon directly determines the performance of the IABP balloon catheter. The balloon is required to have extremely high anti-explosion performance, thin and uniform walls, soft and foldable. To meet these requirements, not only the polymer material used must have extremely strong mechanical and physical properties, but also high requirements are placed on the molding process.

[0003] At present, the molding of balloons is usually divided into three steps: molding of the main body of the balloon - molding of the conical end - molding of the thin necks at both ends, in which the thin necks are used to connect with the TIP head and the catheter in the later steps, so it is necessary to ensure that its inner diameter and wall thickness meet the requirements. The molding method of the thin neck can be realized by adopting the technical solution disclosed in the Chinese utility model application "Balloon Neck Remodeling Process" (Publication No.: CN101810905A): two chucks are used to clamp the balloon and the distal or proximal tube of the balloon respectively, and the balloon neck area between the two chucks is heated by a hot air nozzle to soften the material, and then the molecular chains of the balloon neck area are rearranged by moving the chucks and stretching, so as to reshape the balloon neck area. Due to the clamping of the chuck, the conical end is prone to indentation at the clamping position, resulting in the end not being a smooth arc, but a mushroom head shape. On the one hand, it affects the evaluation of the air intake and anti-explosion performance in the balloon, and on the other hand, the non-smooth transition outer surface affects blood flow and is prone to thrombus aggregation. Utility Model Content

[0004] One purpose of the utility model is to provide a thermoplastic polymer pipe diameter reducing and thinning die capable of ensuring the shape of a tapered end portion.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a thermoplastic polymer tube variable diameter thinning mold, including a first module and a second module spaced apart in the stretching direction of the tube, the first mold cavity of the first module including a first equal-diameter tube cavity, a first tapered tube cavity and a first connecting cavity therebetween, the second mold cavity of the second module including a second equal-diameter tube cavity, a second tapered tube cavity and a second connecting cavity therebetween, the inner diameter of the second equal-diameter tube cavity is less than the inner diameter of the first equal-diameter tube cavity and less than the outer diameter of the tube, and the tapers of the first tapered tube cavity and the second tapered tube cavity are consistent with the taper of the tapered end of the finished balloon.

[0006] The first mold group and the second mold group have similar structures. The first mold group includes a first left half mold, a first right half mold and a first heating module arranged on the outer wall of the half mold. The molding surfaces of the first left half mold and the first right half mold are provided with grooves. When the driving mechanism drives the first left half mold and the first right half mold to close the mold, the grooves on the first left half mold and the first right half mold are interlocked to form a first mold cavity. The length of the second equal-diameter tube cavity is smaller than the length of the first equal-diameter tube cavity, and the length of the second conical tube cavity is larger than the length of the first conical tube cavity.

[0007] The center lines of the first mold cavity of the first mold group and the second mold cavity of the second mold group are collinear and located on the same horizontal line.

[0008] Both ends of the first equal-diameter tube cavity of the first module are connected to the first conical tube cavity, and the two first conical tube cavities are symmetrically arranged relative to the vertical midline of the first equal-diameter tube cavity. Both ends of the second equal-diameter tube cavity of the second module are connected to the second conical tube cavity, and the two second conical tube cavities are symmetrically arranged relative to the vertical midline of the second equal-diameter tube cavity.

[0009] Temperature sensors are provided on the first left half mold and / or the first right half mold, the second left half mold and / or the second right half mold. The temperature sensors collect the real-time temperature of the half molds and feed it back to the control unit. The control unit adjusts the heating temperature of the first heating module and the second heating module in real time.

[0010] Another object of the utility model is to provide a device with high precision and good consistency.

[0011] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a device, a gantry bracket is arranged on the base across the width direction of the base, the first module and the second module are arranged on the gantry bracket, a guide rail is arranged on the base along its length direction, and the guide rails on both sides of the gantry bracket are respectively provided with a first clamping and traction mechanism and a second clamping and traction mechanism, and a driving unit drives the clamping and traction mechanism to form a sliding fit along the guide rail.

[0012] A slide rail is arranged on the lower plate surface of the top plate of the gantry bracket. The slide rail is located in the horizontal direction and the length direction of the slide rail is arranged perpendicular to the length direction of the guide rail. The left half mold and the right half mold form a sliding fit with the slide rail, and the driving mechanism drives the left half mold and the right half mold to close and separate the molds.

[0013] The gantry bracket and the guide rail also form a sliding fit.

[0014] The gantry supports include two, the first module group and the second module group are respectively arranged on different gantry supports, and the two gantry supports are driven by different driving mechanisms and can move relative to each other.

[0015] Position sensors are arranged on the sides of the guide rail and the slide rail, and the control unit is arranged on the side of the base.

[0016] In the above scheme, the mold cavity includes an equal diameter cavity and a tapered tube cavity, and the taper of the tapered tube cavity is consistent with the taper of the tapered end of the finished balloon, so that the shape and taper of the end of the balloon embryo can be maintained while the tubes at both ends of the balloon embryo are stretched thin. At the same time, when the tapered end of the balloon embryo is located in the tapered tube cavity, it can also be heated and stretched. After this step, the end does not even need to be stretched and shaped separately, but only needs to be shaped together with the balloon as a whole, which simplifies the processing technology and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional diagram of the device;

[0018] Figure 2 is a cross-sectional view of the device;

[0019] Figure 3 for Figure 2 A partially enlarged schematic diagram of

[0020] Figure 4 This is an exploded view of the gantry bracket and module;

[0021] Figure 5 A three-dimensional view of the left half of the first module and the second module;

[0022] Figure 6 for Figure 5 The main view of

[0023] Figure 7 Schematic diagram of the structure of the balloon. DETAILED DESCRIPTION

[0024] In order to better understand the technical solution of the utility model, it is first emphasized that the diameter reduction and thinning of the material tube (made of thermoplastic polymer material) in the present invention is carried out for the balloon embryo. The so-called balloon embryo is after the initial blow molding, the middle straight tube section has been basically formed, but it is not close to the inner wall of the molding mold, and at this time the wall thickness of the balloon end is thicker, and the shoulders at both ends are still large diameter and thick wall, so these two parts need to be processed later to meet the requirements. The diameter reduction and thinning mold and equipment in the present invention are designed for the thinning and thinning of the shoulders of the balloon embryo. Figure 1-Figure 7 The utility model is further described in detail.

[0025] A thermoplastic polymer tube variable diameter thinning mold includes a first module 10 and a second module 20 spaced apart in the stretching direction of the tube 1, a first mold cavity A of the first module 10 includes a first equal-diameter tube cavity A1, a first tapered tube cavity A2 and a first connecting cavity A3 therebetween, a second mold cavity B of the second module 20 includes a second equal-diameter tube cavity B1, a second tapered tube cavity B2 and a second connecting cavity B3 therebetween, an inner diameter of the second equal-diameter tube cavity B1 is less than an inner diameter of the first equal-diameter tube cavity A1 and less than an outer diameter of the tube 1, and the tapers of the first tapered tube cavity A2 and the second tapered tube cavity B2 are consistent with the taper of the tapered end of a finished balloon product.

[0026] When the tube 1 passes through the first module 10, it is first heated and stretched to a thick diameter state; then the thick diameter tube passes through the second module 20 and is heated and stretched to a thin diameter state. At this time, the diameter of the tube is exactly equal to the diameter of the shoulders at both ends of the finished balloon, and can be directly welded to the TIP head and the catheter. In the present invention, the specific inner diameter of the mold equal diameter tube cavity is used to draw the tube thinner. This diameter is determined by the shape and inner diameter of the mold cavity. The outer diameter of the drawn material tube is accurate, and different batches of material tubes are drawn with high consistency. Moreover, after two stretchings, on the one hand, the state of the material tube during stretching and expansion is highly controllable, which prevents the tube from being broken. On the other hand, the tube can be evenly stretched and thinned by axial stretching, which improves the uniformity of the wall thickness and ensures the qualified rate of the entire balloon product.

[0027] The innovation of the present invention is that the mold cavity includes an equal diameter cavity and a tapered tube cavity, and the taper of the tapered tube cavity is consistent with the taper of the tapered end of the balloon product, which makes it possible to maintain the shape and taper of the end of the balloon embryo while thinning the tubes at both ends of the balloon embryo. At the same time, when the tapered end of the balloon embryo is located in the tapered tube cavity, it can also be heated and stretched. After this step, the end does not even need to be stretched and shaped separately, but only needs to be shaped together with the balloon as a whole, which simplifies the processing technology and improves production efficiency.

[0028] The specific structure is that the first mold group 10 and the second mold group 20 are similar in structure, the first mold group 10 includes a first left mold half 11, a first right mold half 12 and a first heating module 13 arranged on the outer wall of the mold half, and grooves are provided on the molding surfaces of the first left mold half 11 and the first right mold half 12. When the driving mechanism drives the first left mold half 11 and the first right mold half 12 to close the mold, the grooves on the first left mold half 11 and the first right mold half 12 are interlocked to form the first mold cavity A, the length of the second equal-diameter tube cavity B1 is less than the length of the first equal-diameter tube cavity A1, and the length of the second conical tube cavity B2 is greater than the length of the first conical tube cavity A2. Taking the first mold cavity A as an example, the material tube stretching and thinning in the present invention is in the step after the balloon embryo is formed, so the taper of the first conical tube cavity A2 is set to be consistent with the taper of the end of the finished balloon, and while the shoulder material tube is stretched and thinned, the conical end can also be thinned and shaped to ensure the shape of the conical end of the balloon. The taper of the conical tube cavities in the two modules is the same because there is a heating module on the periphery of the mold cavity. Therefore, the first conical tube cavity A2 is also heated. When the end of the balloon embryo enters the first conical tube cavity A2, it will also be heated, stretched and blown. The shape of the first conical tube cavity A2 can limit the shape of the end of the balloon embryo, so there is no need to perform shoulder and end processing on the shaped balloon, thereby improving product qualification rate and production efficiency.

[0029] In order to improve the uniformity of the drawing and thinning of the tube 1, the center lines of the first cavity A of the first die set 10 and the second cavity B of the second die set 20 are collinear and located on the same horizontal line. The force direction of the tube is consistent, which ensures the roundness of the tube 1 after drawing and thinning, prevents the appearance of corrugation on the thinned tube 1, and improves the concentricity of the tube after processing.

[0030] Since both ends of the spherical balloon embryo need to be connected to other components, the tube materials at both ends need to be stretched and thinned, so both ends of the first equal-diameter tube cavity A1 of the first module 10 are connected with the first tapered tube cavity A2, and the two first tapered tube cavities A2 are symmetrically arranged relative to the vertical midline of the first equal-diameter tube cavity A1, and both ends of the second equal-diameter tube cavity B1 of the second module 20 are connected with the second tapered tube cavity B2, and the two second tapered tube cavities B2 are symmetrically arranged relative to the vertical midline of the second equal-diameter tube cavity B1. In this way, as long as the tube is clamped once and the pulling direction of the tube is changed, the stretching and thinning of the tube materials at both ends can be achieved, thereby saving processing time and improving production efficiency.

[0031] In the stretching process, only by reasonable coordination of parameters such as reasonable axial force, radial force, temperature, stroke, pulling speed, etc. can the material tube with the required diameter and thickness be stretched out. Therefore, the first left half mold 11 and / or the first right half mold 12, the second left half mold 21 and / or the second right half mold 22 are provided with temperature sensors. The temperature sensor collects the real-time temperature of the half mold and feeds it back to the control unit 70. The control unit 70 adjusts the heating temperature of the first heating module 13 and the second heating module 23 to a suitable temperature in real time to ensure that the stretching and thinning process of the tube is controllable.

[0032] A device includes a base 30, on which a gantry bracket 40 is arranged across the width direction of the base, the first module 10 and the second module 20 are arranged on the gantry bracket 40, and a guide rail 31 is arranged on the base 30 along its length direction. The guide rails 31 on both sides of the gantry bracket 40 are respectively provided with a first clamping and traction mechanism 50 and a second clamping and traction mechanism 60, and a driving unit drives the clamping and traction mechanism to form a sliding fit along the guide rail 31. The two ends of the pipe 1 are respectively clamped on the first clamping and traction mechanism 50 and the second clamping and traction mechanism 60, and one of the clamping and traction mechanisms is provided with an inflation device for passing compressed gas into the pipe 1. When one end of the pipe 1 is clamped and ventilated, the other end of the pipe 1 is clamped and sealed by the other clamping and traction mechanism. The control system 70 controls the movement time, direction, displacement, speed, etc. of the pipe 1. When the tube 1 is placed or taken, the driving mechanism drives the two half molds of the first mold set 10 to separate from each other, and after the tube 1 is clamped, the driving mechanism drives the two half molds of the first mold set 10 to move closer to each other and close the mold. The same is true for the splitting and closing of the second mold set 20.

[0033] In order to realize the splitting and closing of the two half molds, a slide rail 42 is provided on the lower plate surface of the top plate 41 of the gantry bracket 40. The slide rail 42 is located in the horizontal direction and the length direction of the slide rail 42 is arranged perpendicular to the length direction of the guide rail 31. The left half mold 11 and the right half mold 12 form a sliding fit with the slide rail 42, and the driving mechanism drives the left half mold 11 and the right half mold 12 to close and split the mold.

[0034] Preferably, the gantry bracket 40 and the guide rail 31 also form a sliding fit, which can adapt to pipes of different sizes and improve the versatility of the entire equipment.

[0035] The gantry bracket 40 includes two, the first module 10 and the second module 20 are respectively arranged on different gantry brackets 40, and the two gantry brackets 40 are driven by different driving mechanisms and can move relative to each other. As described in detail above, the requirements for the stretching speed are different for the thickness of the pipe diameter. The two modules are arranged on two different gantry brackets 40, and the purpose of performing the rough diameter reduction processing and the fine diameter reduction processing at the same time is achieved by adjusting the movement speed of the gantry bracket 40, thereby saving processing time and improving production efficiency.

[0036] In order to detect the stretching length of the pipe 1, position sensors 32 are provided beside the guide rail 31 and the slide rail 42, and the control unit 70 is provided beside the base 30 for easy operation and real-time observation.

[0037] The above shows and describes the basic principle, main features and characteristics of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A thermoplastic polymer tube diameter reducing and thinning die, characterized in that: The invention comprises a first die set (10) and a second die set (20) which are arranged at intervals in the stretching direction of the tube (1); the first die cavity (A) of the first die set (10) comprises a first equal-diameter tube cavity (A1), a first tapered tube cavity (A2) and a first connecting cavity (A3) therebetween; the second die cavity (B) of the second die set (20) comprises a second equal-diameter tube cavity (B1), a second tapered tube cavity (B2) and a second connecting cavity (B3) therebetween; the inner diameter of the second equal-diameter tube cavity (B1) is less than the inner diameter of the first equal-diameter tube cavity (A1) and is less than the outer diameter of the tube (1); and the tapers of the first tapered tube cavity (A2) and the second tapered tube cavity (B2) are consistent with the taper of the tapered end of the finished balloon product.

2. The thermoplastic polymer tube diameter reducing and thinning die according to claim 1, characterized in that: The first mold group (10) and the second mold group (20) are similar in structure. The first mold group (10) comprises a first left half mold (11), a first right half mold (12) and a first heating module (13) arranged on the outer wall of the half mold. The molding surfaces of the first left half mold (11) and the first right half mold (12) are provided with grooves. When the driving mechanism drives the first left half mold (11) and the first right half mold (12) to close the mold, the grooves on the first left half mold (11) and the first right half mold (12) are engaged with each other to form a first mold cavity (A). The length of the second equal-diameter tube cavity (B1) is smaller than the length of the first equal-diameter tube cavity (A1), and the length of the second conical tube cavity (B2) is larger than the length of the first conical tube cavity (A2).

3. The thermoplastic polymer tube diameter reducing and thinning die according to claim 1, characterized in that: The center lines of the first mold cavity (A) of the first mold set (10) and the second mold cavity (B) of the second mold set (20) are colinear and located on the same horizontal line.

4. The thermoplastic polymer tube diameter reducing and thinning die according to claim 2, characterized in that: Both ends of the first equal-diameter tube cavity (A1) of the first module (10) are connected to the first conical tube cavity (A2), and the two first conical tube cavities (A2) are symmetrically arranged relative to the vertical midline of the first equal-diameter tube cavity (A1); both ends of the second equal-diameter tube cavity (B1) of the second module (20) are connected to the second conical tube cavity (B2), and the two second conical tube cavities (B2) are symmetrically arranged relative to the vertical midline of the second equal-diameter tube cavity (B1).

5. The thermoplastic polymer tube diameter reducing and thinning die according to claim 1, characterized in that: The first left half mold (11) and / or the first right half mold (12), the second left half mold (21) and / or the second right half mold (22) are provided with temperature sensors, the temperature sensors collect the real-time temperature of the half molds and feed back to the control unit (70), and the control unit (70) adjusts the heating temperature of the first heating module (13) and the second heating module (23) in real time.

6. An apparatus comprising the thermoplastic polymer tube diameter reducing and thinning die according to any one of claims 1 to 5, characterized in that: The invention comprises a base (30), wherein a gantry bracket (40) is arranged on the base (30) and extends across the width direction of the base, wherein the first module (10) and the second module (20) are arranged on the gantry bracket (40), and guide rails (31) are arranged on the base (30) along the length direction thereof, and a first clamping and traction mechanism (50) and a second clamping and traction mechanism (60) are respectively arranged on the guide rails (31) on both sides of the gantry bracket (40), and a driving unit drives the clamping and traction mechanisms to form a sliding fit along the guide rails (31).

7. The device according to claim 6, characterized in that: A slide rail (42) is provided on the lower plate surface of the top plate (41) of the gantry bracket (40). The slide rail (42) is located in the horizontal direction and the length direction of the slide rail (42) is arranged perpendicular to the length direction of the guide rail (31). The left half mold (11) and the right half mold (12) form a sliding fit with the slide rail (42), and the driving mechanism drives the left half mold (11) and the right half mold (12) to close and separate the molds.

8. The device according to claim 7, characterized in that: The gantry bracket (40) and the guide rail (31) also form a sliding fit.

9. The device according to claim 8, characterized in that: The gantry bracket (40) comprises two, the first module (10) and the second module (20) are respectively arranged on different gantry brackets (40), and the two gantry brackets (40) are driven by different driving mechanisms and can move relative to each other.

10. The device according to claim 7, characterized in that: Position sensors (32) are arranged on the sides of the guide rail (31) and the slide rail (42), and the control unit (70) is arranged on the side of the base (30).

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