A control method and system for a multi-lumen plastic urinary catheter gas-assisted extrusion die device

Abstract

The present invention relates to the field of medical equipment manufacturing technology, and in particular to a control method and system for a multi-cavity plastic urinary catheter gas-assisted extrusion die device. The method comprises using a gas-assisted control unit to extrude the multi-cavity plastic urinary catheter gas-assisted extrusion die device, wherein the device comprises a head body, a diverter cone, and a die arranged in an extrusion direction, and a core rod connector provided with multiple partitions to form multiple mutually unconnected channels; multiple core rods form a multi-cavity structure of plastic catheter melt during extrusion, and under the action of multiple metal partitions, the core rods and the core rod connector in each channel form an independent first gas-assisted chamber, and the outlet cover and the die form a second gas-assisted chamber, so that the internal auxiliary gas of the multiple cavities can be controlled separately, greatly improving the stability and effectiveness of the gas-assisted extrusion molding of the multi-cavity plastic urinary catheter. The present invention greatly reduces the difficulty of device processing and die assembly, reduces the overall volume of the device, and improves the efficiency of the die.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment manufacturing, and in particular to a control method and system for a multi-lumen plastic urinary catheter gas-assisted extrusion die device. Background Art

[0002] Traditional multi-lumen plastic urinary catheter products can be processed and produced through extrusion molding. However, as the plastic melt rotates in the extruder screw, it will experience large shear and tensile stresses in the extrusion barrel and die channel. When the melt is squeezed out of the die outlet, it will cause problems such as die expansion, extrusion deformation and melt fracture, affecting the quality of multi-lumen plastic urinary catheter products.

[0003] For gas-assisted extrusion of multi-lumen plastic urinary catheters, multiple core rods are required to form the multi-lumen structure of the catheter. In order to eliminate the extrusion problem of multiple lumens, multiple internal auxiliary gas layers need to be formed on the outer walls of the multiple core rods.

[0004] The existing technology is to process multiple air inlet channels on the diverter cone and multiple core rods in the die, and introduce multiple auxiliary gases along the respective air inlet channels to the outer wall surfaces of the multiple core rods inside. However, this method has the following drawbacks:

[0005] (1) As the number of inner cavities and core rods increases, a large number of air inlet channels need to be processed on the diverter cone and multiple core rods. For the diverter cone and core rods, which are not large in size, this greatly increases the difficulty of air inlet channel layout and processing. At the same time, it also greatly increases the difficulty of matching the air inlet channels in the diverter cone and core rod, which is very unfavorable for the assembly of the die and the good ventilation of multiple internal auxiliary gases.

[0006] (2) The lack of independent control over the auxiliary gas in the inner cavity resulted in problems with the extruded multi-lumen plastic urinary catheter, affecting product quality, mainly manifested in:

[0007] When the internal auxiliary gas pressure is low, although the auxiliary gas in the inner cavity of a small plastic catheter melt meets the requirements, for a large plastic catheter melt, the auxiliary gas pressure in the inner cavity is insufficient, resulting in extrusion deformation.

[0008] When the inner cavity auxiliary gas pressure is high, although the inner cavity auxiliary gas of the plastic catheter melt with a large structure meets the requirements, for the plastic catheter melt with a small structure, the excessive inner cavity auxiliary gas pressure will blow the small inner cavity apart. Summary of the Invention

[0009] The present invention aims to at least improve one of the technical problems existing in the prior art. To this end, the present invention provides a control method and system for a gas-assisted extrusion die device for a multi-lumen plastic urinary catheter.

[0010] The technical solutions of the present invention are as follows:

[0011] A method for controlling a multi-lumen plastic urinary catheter gas-assisted extrusion die device, wherein a gas-assisted control unit is used to extrude the multi-lumen plastic urinary catheter gas-assisted extrusion die device, wherein the multi-lumen plastic urinary catheter gas-assisted extrusion die device comprises a die body, a diverter cone, and a die arranged according to the extrusion direction, and further comprises:

[0012] A mandrel connector is connected to the diverter cone and is used to form an extrusion molding cavity on the surface of the mandrel connector for extruding the plastic urinary catheter melt, wherein the mandrel connector is provided with a plurality of partitions to form a plurality of mutually incommunicating channels;

[0013] A plurality of mandrels, each mandrel being connected to the diverter cone and extending from a mandrel connector, are provided to form a plastic catheter melt with a multi-cavity structure during extrusion, wherein the mandrel located in each channel and the mandrel connector form a first gas-assisted chamber, and when gas flows through each first gas-assisted chamber to the inner cavity side of each corresponding plastic catheter melt, a first gas-assisted layer is formed, and each mandrel has a hollow exhaust channel for exhausting excess gas in the first gas-assisted layer;

[0014] An outlet cover plate is connected to the die, wherein an annular groove is formed at the end of the die away from the diverter cone, forming a second gas-assisted chamber with the outlet cover plate, and when gas flows through each second gas-assisted chamber to the outer cavity side of each corresponding plastic urinary catheter melt, a second gas-assisted layer is formed;

[0015] The control method comprises the following steps:

[0016] S1: Build a control scene for the gas-assisted extrusion die device for a multi-lumen plastic urinary catheter;

[0017] S2: The gas pressure of the first gas-assisted chamber of each mandrel is obtained in real time, and the gas is heated to reach a predetermined target temperature before extrusion begins;

[0018] S3: Obtaining the gas pressure of the second gas-assisted chamber of each mandrel, and determining whether the gas pressure of the second gas-assisted chamber meets a first preset condition based on the gas pressure of the second gas-assisted chamber; if not, executing an adjustment strategy to obtain an adjusted gas pressure;

[0019] S4: Determine whether a melt thickness adjustment signal corresponding to any core rod is received. If so, start the vacuum pump to control the gas extraction amount of the first gas-assisted chamber to adjust the melt thickness;

[0020] S5: Water-cooled forming to obtain multi-lumen plastic urinary catheters of different thicknesses and sizes.

[0021] In a possible technical solution, further, the S1 includes:

[0022] A temperature sensor is arranged in each gas-assisted chamber and connected to the gas-assisted control unit respectively;

[0023] Each gas-assisted chamber is connected to an external gas source device through an air inlet pipeline. A pressure regulating valve, a pressure gauge and a flow meter are installed on each air inlet pipeline and connected to the gas-assisted control unit for feedback of gas pressure and gas flow;

[0024] The exhaust channel of each core rod is connected to the vacuum pump through an exhaust pipeline. A pressure regulating knob is installed on each exhaust pipeline and is connected to the gas-assisted control unit to control the gas extraction amount of the exhaust channel.

[0025] In a possible technical solution, further, the S1 further includes:

[0026] A gas heater is installed on each air intake pipeline, and the gas heater is connected to the gas-assisted control unit to regulate the gas temperature on each air intake pipeline.

[0027] In a possible technical solution, further in S3, the first preset condition is:

[0028] The gas pressure of the second gas-assisted chamber is equal to the gas pressure of the first gas-assisted chamber;

[0029] The adjustment strategy is:

[0030] The gas pressure of the first gas-assisted chamber and the gas pressure of the second gas-assisted chamber are adjusted until a first preset condition is met.

[0031] The predetermined target temperature value can be input into the gas-assisted control unit through a manual input module to set the target temperature value.

[0032] In a possible technical solution, further, the die is in close contact with the diverter cone and is spaced apart from the mandrel connector to form a compression molding cavity, and the device further includes:

[0033] The clamping ring is fixedly connected to the head body to axially limit the diverter cone and the die.

[0034] In a possible technical solution, further,

[0035] The diverter cone is embedded in the cavity of the nose body, and the diverter cone has a channel hole that is communicated with the compression molding cavity.

[0036] In a possible technical solution, further, the diverter cone has a plurality of air intake channels and a plurality of air exhaust channels, which are used to communicate with the channels of the mandrel connector to perform air intake or exhaust operations.

[0037] The control method of the gas-assisted extrusion die device for a multi-lumen plastic urinary catheter according to the present invention has the following beneficial effects:

[0038] 1. Multiple independent internal gas-assisted chambers can be formed between the core rod kit and the diverter cone under the action of multiple metal partitions, so that the process parameters of the internal auxiliary gas of multiple cavities can be controlled separately, greatly improving the stability and effectiveness of the gas-assisted extrusion molding of multi-lumen plastic urinary catheters.

[0039] 2. The present invention optimizes the gas-assisted extrusion die device of the multi-lumen plastic urinary catheter, and processes multiple auxiliary gas inlet channels and independent gas-assisted chamber structures inside the diverter cone and core rod kit, which greatly reduces the difficulty of device processing and die assembly, reduces the overall volume of the device, and improves the efficiency of die use.

[0040] 3. The present invention only needs to add an air inlet channel and an exhaust channel to the diverter cone and process a corresponding number of core rod kits with independent air-assisted chambers, so as to expand the air-assisted extrusion die device for multi-cavity plastic urinary catheters, which has strong applicability and practicality.

[0041] A control system for a multi-lumen plastic urinary catheter gas-assisted extrusion die device, wherein the multi-lumen plastic urinary catheter gas-assisted extrusion die device is controlled by adopting the above-mentioned control method.

[0042] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, it implements the control method of the multi-lumen plastic urinary catheter gas-assisted extrusion die device as described above.

[0043] A computer storage medium, wherein instructions are stored in the computer storage medium. When the instructions are executed on a computer, the computer is caused to execute the control method of the multi-lumen plastic urinary catheter gas-assisted extrusion die device as described above.

[0044] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 This is a flow chart of a control method for a gas-assisted extrusion die device for a multi-lumen plastic urinary catheter;

[0047] Figure 2 This is a schematic diagram of the structure of a gas-assisted extrusion die device for a multi-lumen plastic urinary catheter;

[0048] Figure 3 This is a schematic diagram of the control scenario based on the gas-assisted extrusion die device for a multi-lumen plastic urinary catheter;

[0049] Figure 4 This is a side view of the diverter cone of the gas-assisted extrusion die assembly for a multi-lumen plastic urinary catheter;

[0050] Figure 5 This is an AA cross-sectional view of the diverter cone of the gas-assisted extrusion die device for a multi-lumen plastic urinary catheter;

[0051] Figure 6 1. It is a structural diagram of a mandrel connector of a multi-lumen plastic urinary catheter gas-assisted extrusion die device;

[0052] Figure 7 This is a schematic diagram from another perspective of the mandrel connector of the gas-assisted extrusion die assembly for a multi-lumen plastic urinary catheter;

[0053] Figure 8 This is a schematic diagram of the die structure of a multi-lumen plastic urinary catheter gas-assisted extrusion die device;

[0054] Figure 9 1. It is a schematic cross-sectional view of a die for a multi-lumen plastic urinary catheter gas-assisted extrusion die device;

[0055] Figure 10 yes Figure 2 A magnified schematic diagram of part A in FIG;

[0056] Figure 11 yes Figure 2 An enlarged schematic diagram of part B in FIG.

[0057] Reference numerals:

[0058] Head body 1, cavity 100, through hole 101, first air inlet connector 1010, second air inlet connector 1011, first air exhaust connector 1012, second air exhaust connector 1013, first small air pump 1014, second small air pump 1015;

[0059] Splitting cone 2, channel hole 200, first air inlet channel 2011, second air inlet channel 2012, first exhaust channel 2021, second exhaust channel 2022;

[0060] Mandrel connector 3, partition 30, connecting body 310, crescent tube 320, mandrel tube 330, first gas-assisted chamber 3001, notch 3201;

[0061] A first core rod 41 and a second core rod 42;

[0062] Mouth die 5, annular stepped portion 500, inclined portion 5001, second gas-assisted port 501;

[0063] Clamp 6;

[0064] Outlet cover 7;

[0065] Gas-assisted control unit 8;

[0066] Cooling water tank 9;

[0067] Extruder 10, hopper 11, barrel 12, screw 103, motor 104;

[0068] Multi-lumen plastic urinary catheter gas-assisted extrusion die device 20, air compressor 21, gas storage tank 22, pressure reducing valve 23, pressure gauge 24, dryer 25, first three-way valve 261, second three-way valve 262, first pressure regulating valve 271, second pressure regulating valve 272, third pressure regulating valve 273, first pressure gauge 281, second pressure gauge 282, third pressure gauge 283, first flow meter 291, second flow meter 292, third flow meter 293, first gas heater 2101, second gas heater 2102, third gas heater 2103;

[0069] Belt traction machine 13. DETAILED DESCRIPTION

[0070] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0071] It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0073] In the specification, claims, and accompanying drawings of this application, the terms "first," "second," "third," and the like are used to distinguish different objects and are not used to describe a particular order. Furthermore, the terms "including," "comprising," "having," and any variations thereof are intended to cover non-exclusive inclusions. For example, a list of steps or elements may be included, or alternatively, steps or elements not listed may be included, or other steps or elements may be included that are inherent to the process, method, product, or apparatus.

[0074] Only portions relevant to the present application are shown in the accompanying drawings, not all of them. Before discussing the exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the various operations (or steps) as sequential processes, many of the operations can be performed in parallel, concurrently, or simultaneously. In addition, the order of the various operations can be rearranged. The process can be terminated when its operations are completed, but can also have additional steps not included in the accompanying drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0075] As used in this specification, the terms "component," "module," "system," "unit," and the like are used to refer to computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a unit can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, and / or distributed between two or more computers. In addition, these units can be executed from various computer-readable media having various data structures stored thereon. Units can communicate, for example, via local and / or remote processes based on signals having one or more data packets (e.g., data from a second unit interacting with another unit in a local system, a distributed system, and / or a network, such as the Internet, which interacts with other systems via signals).

[0076] Example 1

[0077] like Figures 1 to 11 As shown, this embodiment provides a multi-lumen plastic urinary catheter gas-assisted extrusion die device, which includes a head body 1, a diverter cone 2 and a die 5 arranged according to the extrusion direction, wherein the head body 1 has a cavity 100, and a plurality of through holes 101 connected to the cavity 100 are opened on the surface of the head body 1. The through holes 101 are used for ventilation or exhaust, and the through holes 101 can be installed with an air inlet connector or an exhaust connector for connecting to an external air source device or an air pump;

[0078] It should be noted that the air inlet connector includes a first air inlet connector 1010 and a second air inlet connector 1011;

[0079] The exhaust connector includes a first exhaust connector 1012 and a second exhaust connector 1013 .

[0080] The diverter cone 2 is embedded in the cavity 100 of the head body 1. The diverter cone 2 has a plurality of channel holes 200. The diverter cone 2 is provided with a plurality of air inlet channels and a plurality of air outlet channels.

[0081] Specifically, in this embodiment, the air intake channel includes a first air intake channel 2011 and a second air intake channel 2012, wherein the first air intake channel 2011 is connected to the first air intake connector 1010, and the second air intake channel 2012 is connected to the second air intake connector 1011; the exhaust channel includes a first exhaust channel 2021 and a second exhaust channel 2022, wherein the first exhaust channel 2021 is aligned with the first exhaust connector 1012 of the head body 1, and the second exhaust channel 2022 is aligned with the second exhaust connector 1013, so as to facilitate extension to the outside of the head body 1 and connection to an external air pump device through an exhaust pipe. The first air intake channel 2011 and the second air intake channel 2012 are aligned with the through hole 101 of the head body 1, so as to facilitate extension to the outside of the head body 1 and connection to an external air source device through an air intake pipe.

[0082] It should be noted that, in this embodiment, a pressure regulating valve, a pressure gauge and a flow meter are respectively installed on the air inlet pipeline to adjust the gas pressure and flow changes in the gas-assisted chamber.

[0083] A mandrel connector 3 is connected to the diverter cone 2 and is used to form an extrusion molding cavity on the surface of the mandrel connector 3 for extruding the plastic urinary catheter melt, wherein a plurality of partitions 30 are provided in the mandrel connector to form a plurality of mutually incommunicating channels;

[0084] Multiple core rods, each connected to the diverter cone 2 and extending from a core rod connector 3, can form a multi-cavity plastic catheter melt when plastic raw materials are introduced for extrusion, wherein the core rod located in each channel and the core rod connector 3 form a first gas-assisted chamber 3001. When gas flows through each first gas-assisted chamber 3001 to the inner cavity side of each corresponding plastic catheter melt, a first gas-assisted layer is formed. By regulating the gas pressure of the first gas-assisted chamber 3001, excessive inner cavity gas pressure is prevented from rupturing the multi-cavity plastic catheter. Each core rod has a hollow exhaust channel that can be used to exhaust excess gas in the first gas-assisted layer;

[0085] The die 5 is embedded in the cavity 100 of the die body 1 and is in close contact with the diverter cone 2. The end of the die 5 away from the diverter cone 2 is provided with an annular stepped portion 500, and the annular stepped portion 500 close to the compression molding cavity is provided with an inclined portion 5001;

[0086] A clamping ring 6 is fixedly connected to the die body 1 to axially limit the diverter cone 2 and the die 5;

[0087] The outlet cover plate 7 is connected to the die 5 and forms a second gas-assisted chamber with the annular stepped portion 500. When the gas flows through each second gas-assisted chamber to the outer cavity side of each corresponding plastic urinary catheter melt, a second gas-assisted layer is formed;

[0088] The control scenario based on the multi-lumen plastic urinary catheter gas-assisted extrusion die device includes a temperature sensor installed in each gas-assisted chamber;

[0089] A gas-assisted control unit 8, connected to the temperature sensor, for collecting the temperature in the gas-assisted chamber;

[0090] The gas-assisted control unit 8 includes a pressure regulating knob installed on each exhaust pipeline. The pressure regulating knob is connected to the controller of the gas-assisted control unit 8 and is used to control the gas extraction amount of the exhaust channel.

[0091] The gas heater is connected to the gas-assisted control unit 8 and is used to regulate the gas temperature on each intake pipe.

[0092] It should be noted that, in this embodiment, the mandrel connector 3 includes:

[0093] The connecting body 310 is in the shape of a hollow truncated cone, and its outer diameter gradually shrinks along the extrusion direction. The connecting body 310 is connected to the diverter cone 2 via internal and external threads;

[0094] A crescent tube 320 is connected to and communicates with the connecting body 310 , wherein the diameter of the circle where the outer wall of the crescent tube 320 is located is equal to the minimum diameter of the connecting body 310 ;

[0095] The core rod barrel 330 is connected to and communicates with the connecting body 310, wherein the core rod barrel 330 is inscribed in the minimum diameter circle of the connecting body 310, and the core rod barrel 330 is located outside the crescent barrel 320. After the core rod is inserted into the core rod barrel 330, it is connected to the diverter cone 2 to assist in extruding a multi-lumen plastic urinary catheter.

[0096] It should be noted that the mandrel connector 3 comprises two sleeves of different inner diameters. The mandrel passes through each sleeve and is threadedly fixedly connected to the diverter cone 2. A gap exists between each mandrel and the inner wall of the sleeve, which is used to introduce multiple internal auxiliary gases into the multiple inner cavity walls of the multi-lumen plastic urinary catheter to assist in extruding the multi-lumen plastic urinary catheter. In this embodiment, the mandrel comprises:

[0097] The first core rod 41 passes through the crescent tube 320 and is threadedly connected to the diverter cone 2;

[0098] The second core rod 42 passes through the core rod tube 330 and is threadedly connected to the diverter cone 2, wherein a gap of about 0.2 mm is reserved between the first core rod 41 and the inner wall surface of the crescent tube 320, and a gap of about 0.2 mm is reserved between the second core rod 42 and the inner wall surface of the core rod tube 330. The gas extraction amount of each exhaust channel is controlled by individually adjusting the pressure regulating knob of each exhaust pipeline, thereby controlling the size of the inner cavity of the multi-lumen plastic urinary catheter and preventing the inner cavity of the multi-lumen plastic urinary catheter from bursting due to excessive internal gas-assisted gas pressure.

[0099] It should be noted that, in this embodiment, the compression molding cavity is connected to the first gas-assisted chamber 3001. Specifically, there is a notch 3201 at an angle to the connecting body 310 between the end of the crescent tube 320 away from the connecting body 310 and the end of the outlet cover plate 7, and the compression molding cavity and the first gas-assisted chamber 3001 are connected through the notch 3201.

[0100] It should be noted that, in this embodiment, the side wall of the die 5 is provided with a second gas-assisted port 501 connected to an external gas source device, and a third gas inlet connector can be installed to pressurize and inflate the second gas-assisted chamber.

[0101] It should be noted that, in this embodiment, the distance between the outlet cover plate 7 and the inclined portion 5001 is in the range of 0.1 mm to 0.4 mm, which facilitates the formation of a uniform air cushion layer on the inner surface of the die 5 so that the melt flows in a plunger-like manner to form the plastic catheter melt.

[0102] It should be noted that, in this embodiment, the angle between the inclined portion 5001 and the axial direction of the die 5 is 5° to 20°, which facilitates the formation of an air cushion layer tightly attached to the inner surface of the die 5 in the compression molding cavity, and is conducive to extruding a uniform plastic catheter melt.

[0103] This embodiment provides a control method based on the above-mentioned multi-lumen plastic urinary catheter gas-assisted extrusion die device, comprising the following steps:

[0104] S1: Build a control scene for the gas-assisted extrusion die device for a multi-lumen plastic urinary catheter;

[0105] S2: The gas pressure of the first gas-assisted chamber of each mandrel is obtained in real time, and the gas is heated to reach a predetermined target temperature before extrusion begins;

[0106] S3: Obtaining the gas pressure of the second gas-assisted chamber of each mandrel, and determining whether the gas pressure of the second gas-assisted chamber meets a first preset condition based on the gas pressure of the second gas-assisted chamber; if not, executing an adjustment strategy to obtain an adjusted gas pressure;

[0107] S4: Determine whether a melt thickness adjustment signal corresponding to any core rod is received. If so, start the vacuum pump to control the gas extraction amount of the first gas-assisted chamber to adjust the melt thickness;

[0108] S5: Water-cooled forming to obtain multi-lumen plastic urinary catheters of different thicknesses and sizes.

[0109] It should be noted that, in S3 of this embodiment, the first preset condition is:

[0110] The gas pressure of the second gas-assisted chamber is equal to the gas pressure of the first gas-assisted chamber;

[0111] The adjustment strategy is:

[0112] The gas pressure of the first gas-assisted chamber and the gas pressure of the second gas-assisted chamber are adjusted until a first preset condition is met.

[0113] The predetermined target temperature value can be input into the gas-assisted control unit through a manual input module to set the target temperature value.

[0114] It should be noted that, in this embodiment, the target temperature value is 180° C. to 220° C., which can be used to extrude plastic urinary catheters made of various materials.

[0115] The present invention proposes the following specific implementation cases and implementation steps:

[0116] Step 1. After the multi-lumen plastic urinary catheter gas-assisted extrusion die device is assembled and tightly connected to the outlet of the extruder 10, the multiple gas output plastic tubes in the gas-assisted control unit 8 are respectively connected to the corresponding joints of the multi-lumen plastic urinary catheter gas-assisted extrusion die device, that is: the plastic tube of the second gas-assisted branch is connected to the third air inlet joint on the multi-lumen plastic urinary catheter gas-assisted extrusion die device; the gas output plastic tube of the first gas-assisted first branch is connected to the first air inlet joint 1010 on the multi-lumen plastic urinary catheter gas-assisted extrusion die device; the gas output plastic tube of the first gas-assisted second branch is connected to the second air inlet joint 1011 on the multi-lumen plastic urinary catheter gas-assisted extrusion die device, and so on, until the gas output plastic tubes of all gas-assisted branches are connected to the corresponding gas-assisted air inlet joints on the multi-lumen plastic urinary catheter gas-assisted extrusion die device. Then, the joints on all the internal gas exhaust ports, namely the first exhaust joint 1012 and the second exhaust joint 1013, are connected to the first small air pump 1014 and the second small air pump 1015 through plastic tubes.

[0117] Step 2: Pour the plastic raw material into the barrel 12 of the extruder 10 through the hopper 11, turn on the power, and heat the extruder 10 and the multi-lumen plastic urinary catheter gas-assisted extrusion die device 20.

[0118] Step 3. Turn on the gas-assisted control unit 8 of the multi-lumen plastic urinary catheter. The air compressor 21 generates compressed air of a certain pressure and flow, which enters the gas storage tank 22 and is transmitted through a metal or plastic pipe. After passing through the pressure reducing valve 23 for pressure regulation, the pressure gauge 24 and the dryer 25 in turn, the prepared dry compressed air is divided into multiple gas-assisted branches by the first three-way valve 261 and the second three-way valve 262. Each gas-assisted branch then passes through the pressure regulating valve, pressure gauge and flow meter in turn to adjust the gas pressure and flow changes on the second gas-assisted branch, the first gas-assisted first branch and the first gas-assisted second branch respectively.

[0119] It should be noted that the pressure regulating valves are the first pressure regulating valve 271, the second pressure regulating valve 272, and the third pressure regulating valve 273, which respectively regulate the gas pressure of each gas-assisted branch;

[0120] The pressure gauges are a first pressure gauge 281, a second pressure gauge 282, and a third pressure gauge 283, which respectively collect the gas pressure value of each gas-assisted branch;

[0121] The flow meters are the first flow meter 291, the second flow meter 292, and the third flow meter 293, which are respectively used to collect the gas flow of each gas-assisted branch. The pressure regulating valve, pressure gauge and flow meter are all precision instruments for collecting or regulating to improve extrusion accuracy.

[0122] Step 4: Turn on the gas heater on each gas-assisted branch, set the gas heating temperature, and heat the gas on the second gas-assisted branch, the first gas-assisted first branch, and the first gas-assisted second branch respectively.

[0123] It should be noted that the gas heaters are the first gas heater 2101 , the second gas heater 2102 , and the third gas heater 2103 , which are respectively used to heat the gas in each gas-assisted branch.

[0124] Step 5: After the gas temperature of each gas-assisted branch reaches a predetermined temperature value, the heated gas of each gas-assisted branch is introduced into the corresponding air inlet channel of the multi-lumen plastic urinary catheter gas-assisted extrusion die device 20 through a plastic tube.

[0125] Step 6. The auxiliary gas of each gas-assisted branch will enter its own gas-assisted chamber along each air inlet channel in the multi-cavity plastic urinary catheter gas-assisted extrusion die device, such as the first gas-assisted chamber, the second gas-assisted chamber, etc., and finally flow into the flow channel of the multi-cavity plastic urinary catheter gas-assisted extrusion die device.

[0126] Step 7: Start the motor 104 of the extruder 10 and turn the screw 103. At the set screw speed, the extruder 10, under the rotation and stirring of the internal screw 103, conveys the molten plastic melt to the outlet of the extruder barrel 12 and into the inlet of the multi-lumen plastic urinary catheter gas-assisted extrusion die assembly. The melt passes through the inlet section, diversion section, compression section, and shaping section of the multi-lumen plastic urinary catheter gas-assisted extrusion die assembly in sequence, and then enters the gas-assisted section. Under the action of the first and second gas-assisted layers, it is extruded from the outlet of the multi-lumen plastic urinary catheter gas-assisted extrusion die assembly.

[0127] Step 8. During the continuous extrusion of the multi-lumen plastic urinary catheter, the pressure regulating valves, pressure gauges and flow meters on each branch of the second gas-assisted branch and the first gas-assisted branch can be adjusted separately to adjust process parameters such as gas pressure, flow and temperature, so as to adjust the stability and appearance quality of the gas-assisted extrusion molding of the multi-lumen plastic urinary catheter.

[0128] Step 9. Turn on the power of the first small air pump 1014 and the second small air pump 1015, and control the extraction amount of each internal gas by adjusting the pressure adjustment knob of each air pump separately, so as to control the size of the inner cavity of the multi-lumen plastic urinary catheter and prevent the inner cavity of the multi-lumen plastic urinary catheter from bursting due to excessive internal gas-assisted gas pressure.

[0129] Step 10: Cool the extruded multi-lumen plastic urinary catheter through the cooling water tank 9 and continuously pull the extruded multi-lumen plastic urinary catheter at the motor speed set by the belt traction machine 13, thereby finally achieving stable and reliable continuous gas-assisted extrusion of the multi-lumen plastic urinary catheter.

[0130] The control method of the gas-assisted extrusion die device for a multi-lumen plastic urinary catheter according to the present invention has the following beneficial effects:

[0131] 1. Multiple independent internal gas-assisted chambers can be formed between the core rod kit and the diverter cone under the action of multiple metal partitions, so that the process parameters of the internal auxiliary gas of multiple cavities can be controlled separately, greatly improving the stability and effectiveness of the gas-assisted extrusion molding of multi-lumen plastic urinary catheters.

[0132] 2. The present invention optimizes the extrusion die device of the multi-lumen plastic urinary catheter, and processes multiple auxiliary gas inlet channels and independent gas-assisted chamber structures inside the diverter cone and core rod kit, which greatly reduces the difficulty of device processing and die assembly, reduces the overall volume of the device, and improves the efficiency of die use.

[0133] 3. The present invention only needs to add air intake and exhaust channels to the diverter cone and process a corresponding number of core rod kits with independent air-assisted chambers to expand the air-assisted extrusion die device for multi-cavity plastic urinary catheters, which has strong applicability and practicality.

[0134] Example 2

[0135] A control system for a multi-lumen plastic urinary catheter gas-assisted extrusion die device, wherein the multi-lumen plastic urinary catheter gas-assisted extrusion die device is controlled by adopting the above-mentioned control method.

[0136] The control system of the multi-lumen plastic urinary catheter gas-assisted extrusion die device provided in the embodiment of the present application can achieve Figure 1 To avoid repetition, the various processes of the control method will not be described here.

[0137] According to the control system of the multi-lumen plastic urinary catheter gas-assisted extrusion die device of the embodiment of the present invention, multiple independent internal gas-assisted chambers can be formed between the core rod kit and the diversion cone under the action of multiple metal partitions, so that the process parameters of the internal auxiliary gas of the multiple inner cavities can be controlled separately, which greatly improves the stability and effectiveness of the gas-assisted extrusion molding of the multi-lumen plastic urinary catheter.

[0138] Optionally, an embodiment of the present application also provides an electronic device, including a processor, a memory, and a program or instruction stored in the memory and executable on the processor. When the program or instruction is executed by the processor, each process of the control method embodiment of the above-mentioned multi-lumen plastic catheter gas-assisted extrusion die device is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0139] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each process of the control method embodiment of the above-mentioned multi-cavity plastic urinary catheter gas-assisted extrusion die device is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0140] The processor is the processor in the electronic device in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), random access memory (RAM), a magnetic disk, or an optical disk.

[0141] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation to the invention.

[0142] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0143] Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Mentioning "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present embodiment application. The appearance of this phrase in various positions in the specification does not necessarily mean that they are all the same embodiments, nor are they independent or alternative embodiments that are mutually exclusive with other embodiments. It can be understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0144] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A method for controlling a gas-assisted extrusion die device for a multi-lumen plastic urinary catheter, characterized in that: An air-assisted control unit is used to extrude a multi-cavity plastic urinary catheter air-assisted extrusion die device, wherein the multi-cavity plastic urinary catheter air-assisted extrusion die device comprises a head body, a diverter cone and a die arranged according to the extrusion direction, and further comprises: A mandrel connector is connected to the diverter cone and is used to form an extrusion molding cavity on the surface of the mandrel connector for extruding the plastic urinary catheter melt, wherein the mandrel connector is provided with a plurality of partitions to form a plurality of mutually incommunicating channels; A plurality of mandrels, each mandrel being connected to the diverter cone and extending from a mandrel connector, forming a plastic catheter melt with a multi-cavity structure during extrusion, wherein the mandrel located in each channel and the mandrel connector form a first gas-assisted chamber, and when gas flows through each first gas-assisted chamber to the inner cavity side of each corresponding plastic catheter melt, a first gas-assisted layer is formed, and each mandrel has a hollow exhaust channel; An outlet cover plate is connected to the die, wherein an annular groove is formed at the end of the die away from the diverter cone, forming a second gas-assisted chamber with the outlet cover plate, and when gas flows through each second gas-assisted chamber to the outer cavity side of each corresponding plastic urinary catheter melt, a second gas-assisted layer is formed; The control method comprises the following steps: S1: Build a control scene for the gas-assisted extrusion die device for a multi-lumen plastic urinary catheter; S2: The gas pressure of the first gas-assisted chamber of each mandrel is obtained in real time, and the gas is heated to reach a predetermined target temperature before extrusion begins; S3: Obtaining the gas pressure of the second gas-assisted chamber of each mandrel, and determining whether the gas pressure of the second gas-assisted chamber satisfies a first preset condition based on the gas pressure of the second gas-assisted chamber. If not, executing an adjustment strategy to obtain an adjusted gas pressure, wherein the first preset condition is: The gas pressure of the second gas-assisted chamber is equal to the gas pressure of the first gas-assisted chamber; The adjustment strategy is: Adjusting the gas pressure of the first gas-assisted chamber and the gas pressure of the second gas-assisted chamber until a first preset condition is met; S4: Determine whether a melt thickness adjustment signal corresponding to any core rod is received. If so, start the vacuum pump to control the gas extraction amount of the first gas-assisted chamber to adjust the melt thickness; S5: Water-cooled forming to obtain multi-lumen plastic urinary catheters of different thicknesses and sizes.

2. The control method of the multi-lumen plastic urinary catheter gas-assisted extrusion die device according to claim 1, characterized in that: Said S1 comprises: A temperature sensor is arranged in each gas-assisted chamber and connected to the gas-assisted control unit respectively; Connect each gas-assisted chamber to an external gas source device through an air inlet pipeline. Each air inlet pipeline is equipped with a pressure regulating valve, a pressure gauge and a flow meter, and is connected to the gas-assisted control unit; The exhaust channel of each core rod is connected to the air pump through an exhaust pipeline. A pressure regulating knob is installed on each exhaust pipeline and is connected to the gas-assisted control unit.

3. The control method of the multi-lumen plastic urinary catheter gas-assisted extrusion die device according to claim 2, characterized in that: Said S1 further comprises: A gas heater is installed on each air intake pipeline, and the gas heater is connected to the gas-assisted control unit.

4. The control method of the multi-lumen plastic urinary catheter gas-assisted extrusion die device according to claim 1, characterized in that: The die is in close contact with the diverter cone and spaced apart from the core rod connector to form a compression molding cavity. The device further comprises a clamping ring fixedly connected to the head body to axially limit the diverter cone and the die.

5. The control method of the multi-lumen plastic urinary catheter gas-assisted extrusion die device according to claim 4, characterized in that: The diverter cone is embedded in the cavity of the nose body, and the diverter cone has a channel hole that is communicated with the compression molding cavity.

6. The control method of the multi-lumen plastic urinary catheter gas-assisted extrusion die device according to claim 5, characterized in that: The splitter cone has a plurality of intake channels and a plurality of exhaust channels.

7. A control system for a multi-lumen plastic urinary catheter gas-assisted extrusion die device, characterized in that: The control method according to any one of claims 1 to 6 is used to control the gas-assisted extrusion die device of a multi-lumen plastic urinary catheter.

8. A computer device, characterized in that: The device comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method for controlling the multi-lumen plastic urinary catheter gas-assisted extrusion die device according to any one of claims 1 to 6 is implemented.

9. A computer storage medium, characterized in that The computer storage medium stores instructions, and when the instructions are executed on the computer, the computer executes the control method of the multi-lumen plastic urinary catheter gas-assisted extrusion die device according to any one of claims 1 to 6.

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