CN120816673A - Injection molding method and device for indwelling needle cannula seat - Google Patents
Injection molding method and device for indwelling needle cannula seatInfo
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- CN120816673A CN120816673A CN202511247589.XA CN202511247589A CN120816673A CN 120816673 A CN120816673 A CN 120816673A CN 202511247589 A CN202511247589 A CN 202511247589A CN 120816673 A CN120816673 A CN 120816673A
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- indwelling needle
- needle cannula
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Abstract
本申请属于模具技术领域，具体涉及一种留置针套管座的注塑方法及注塑装置。该注塑方法包括以下步骤：S1：基于留置针套管座的形状建立型腔，并将型腔与Y型结口对应的位置设置为热流道系统的浇口位置；S2：通过热流道系统，将塑料熔体从浇口位置注入型腔内；S3：待型腔内的留置针套管座冷却成型后，控制动模沿远离定模的方向移动，完成开模动作；S4：驱动顶针板沿靠近定模的方向移动，将成型后的留置针套管座从型腔中顶出；S5：顶针板和动模分别复位，准备进入下一注塑循环；S6：重复执行步骤S1～S5，直至完成预设数量的留置针套管座生产。本申请将热流道浇口设于Y型结口，改善现有浇口存在的三各问题，降低了留置针套管座的开裂概率。
The present application belongs to the field of mold technology, and specifically relates to an injection molding method and an injection molding device for an indwelling needle cannula seat. The injection molding method comprises the following steps: S1: establishing a mold cavity based on the shape of the indwelling needle cannula seat, and setting the position of the mold cavity corresponding to the Y-shaped junction as the gate position of the hot runner system; S2: injecting the plastic melt into the mold cavity from the gate position through the hot runner system; S3: after the indwelling needle cannula seat in the mold cavity is cooled and formed, controlling the movable mold to move in a direction away from the fixed mold to complete the mold opening action; S4: driving the ejector plate to move in a direction close to the fixed mold to eject the molded indwelling needle cannula seat from the mold cavity; S5: the ejector plate and the movable mold are reset respectively, ready to enter the next injection molding cycle; S6: repeating steps S1 to S5 until the production of a preset number of indwelling needle cannula seats is completed. The present application sets the hot runner gate at the Y-shaped junction, improves the three problems existing in the existing gate, and reduces the probability of cracking of the indwelling needle cannula seat.
Description
Technical Field
The application belongs to the technical field of molds, and particularly relates to an injection molding method and an injection molding device for an indwelling needle sleeve seat.
Background
In the modern medical field, the indwelling needle is used as an important medical instrument and is widely applied to the treatment processes of clinical infusion, blood transfusion and the like. The quality of the indwelling needle cannula holder, which is one of the key components of the indwelling needle assembly, is directly related to the performance of the indwelling needle and the safety of the patient. The indwelling needle cannula holder is often required to have good biocompatibility, flexibility, corrosion resistance, and some mechanical strength to ensure stable intravascular retention during the indwelling procedure, while reducing irritation and damage to the patient's blood vessel.
At present, the indwelling needle sleeve seat is made of a specific polymer material, such as PC110 material. PC110 materials are ideal choices for manufacturing indwelling needle cannula holders due to their excellent properties such as high transparency, good impact resistance, heat resistance, and processability. In terms of manufacturing process, the injection molding technology is widely applied to the production of the indwelling needle sleeve seat due to the advantages of high production efficiency, low cost, capability of manufacturing products with complex shapes and the like. The full hot runner needle valve gate injection molding technology has the advantages of being capable of accurately controlling the flow of melt, reducing gate marks, improving product quality and the like, and becomes the main flow technology of the current indwelling needle sleeve seat injection molding.
However, in actual production, despite the advantages of the full hot runner needle valve gate injection molding technique, the selection of the gate location still has a significant impact on the quality of the indwelling needle cannula hub. As shown in fig. 1, the overall structure of a conventional indwelling needle cannula holder having a first gate position is shown. In this structure, the first gate position is selected so that the first gate and its opposite position are susceptible to a cracking phenomenon when the remaining needle cannula holder is subjected to an aging test. The cracking phenomenon not only affects the appearance quality of the indwelling needle sleeve seat, but also can cause potential safety hazards such as leakage and fracture in the use process of the indwelling needle sleeve seat, so that the medical use requirement cannot be met.
Disclosure of Invention
The application aims to provide an injection molding method and an injection molding device for an indwelling needle sleeve seat which meet the medical use requirements, so as to radically reduce the occurrence probability of cracking.
The embodiment of the application can be realized by the following technical scheme:
The injection molding method of the indwelling needle sleeve seat comprises a puncture needle seat, an indwelling needle fixing sheath and a Y-shaped junction, wherein the puncture needle seat and the indwelling needle fixing sheath are coaxially arranged, and the Y-shaped junction is communicated with the side edge of the indwelling needle fixing sheath, and the injection molding method comprises the following steps:
S1, establishing a cavity based on the shape of the indwelling needle sleeve seat, and setting the position of the cavity corresponding to the Y-shaped junction as a gate position of a hot runner system;
s2, injecting plastic melt into the cavity from the gate position through a hot runner system;
s3, after the indwelling needle sleeve seat in the cavity is cooled and molded, controlling the movable die to move along the direction away from the fixed die, and completing the die opening action;
s4, driving the ejector plate to move along the direction close to the fixed die, and ejecting the molded remaining needle sleeve seat from the cavity;
s5, respectively resetting the ejector plate and the movable mould, and preparing for entering the next injection molding cycle;
and S6, repeating the steps S1-S5 until the production of the preset number of indwelling needle sleeve seats is completed.
Further, the gate position is comprehensively determined based on the temperature and the fluidity of the plastic melt.
Preferably, the length of the gate position from the connection position of the Y-shaped junction and the retaining needle fixing sheath is in a proportion range of one third of the total length of the Y-shaped junction.
Preferably, the gate has an outer diameter of 1.2mm.
Preferably, the gate is in the form of a full hot runner needle valve gate.
The injection mold comprises a panel, a fixed mold, a movable mold, square iron, an inclined guide post, a needle jacking plate and a hot runner system, wherein a cavity of an injection molding retaining needle sleeve seat is formed between the fixed mold and the movable mold, and the injection molding method of the injection mold is used for injection molding.
Further, the die cavity comprises a fixed die core, a movable die core, a small core and a first sliding block, wherein the fixed die core is used for forming the outer surface of the indwelling needle sleeve seat, the movable die core is used for forming the inner surface of the indwelling needle sleeve seat, the small core is used for forming a local detail cavity of the indwelling needle sleeve, the ejector plate pushes the ejector pin to move, the indwelling needle sleeve seat is ejected from the movable die core, and the first sliding block synchronously completes lateral core pulling.
Further, the first sliding blocks are arranged in a plurality of rows, the first sliding blocks are connected with the inclined guide posts through inclined holes, and the first sliding blocks are provided with inclined guide grooves;
the movable die core is in sliding connection with the guide chute through a second sliding block.
Further, the movable mould core comprises a first movable mould core and a second movable mould core, the first movable mould core corresponds to the puncture needle seat, the second movable mould core corresponds to the Y-shaped junction, and the first movable mould core and the second movable mould core form an acute angle;
the first movable die core is connected with the output end of the first driving mechanism, the first driving mechanism can drive the first movable die core to reciprocate along the extending direction of the first movable die core, and one end, close to the first sliding block, of the second movable die core is connected with the second sliding block.
Further, the small core corresponds to the retaining needle fixing sheath, and the small core is connected with the movable mould through a fixing mechanism.
The injection molding method and the injection molding device for the indwelling needle sleeve seat provided by the embodiment of the application have the following beneficial effects:
According to the application, the hot runner gate is arranged at the Y-shaped junction, so that on one hand, the space structure at the position is beneficial to the melt to be more uniformly dispersed, the peak value of shearing force and pressure is greatly reduced, and the stress concentration phenomenon is reduced; on one hand, the flow front of the melt in the cavity is more consistent due to the split flow action of the Y-shaped junction, the uneven cooling condition of the melt caused by the flow difference is reduced, and the welding marks frequently occurring at the position opposite to the second pouring gate are reduced or even eliminated, and on the other hand, the problem of stress concentration caused by interference fit is effectively avoided by adopting a non-interference fit mode when the Y-shaped junction is connected with components such as an infusion apparatus, an extension tube, a heparin cap or a needleless connector. The second pouring gate of the application fundamentally improves the problems of stress concentration, gate mark appearance and gate breakage existing in the existing pouring gate;
compared with the traditional circumferential wrapping layout mode, the die cavity disclosed by the application thoroughly eliminates the sector gap, remarkably improves the space utilization rate, simplifies the arrangement of a hot runner system, and reduces the bending structure, the length loss and the hot runner pressure loss.
Drawings
FIG. 1 is a general construction view of a conventional indwelling needle cannula holder having a first gate;
FIG. 2 is a schematic view of the flow direction of the plastic melt in the indwelling needle cannula mount with the first gate of FIG. 1;
FIG. 3 is an overall construction view of an indwelling needle cannula holder with a second gate according to the present application;
FIG. 4 is a schematic view of the flow direction of the plastic melt in the indwelling needle cannula mount with the second gate of FIG. 3;
FIG. 5 is an overall construction diagram of an injection mold according to the present application;
FIG. 6 is an exploded view of an injection mold according to the present application;
FIG. 7 is a top view of a hidden portion of a prior art injection mold having a circumferentially wrapped cavity layout;
FIG. 8 is an enlarged view of a portion of region D of FIG. 7;
FIG. 9 is a top view of the hidden part of the injection mold of the present application;
FIG. 10 is an enlarged view of a portion of region C of FIG. 9;
FIG. 11 is a flow chart of an injection molding method of an indwelling needle cannula holder according to the present application;
FIG. 12 is a set of test parameters during actual production;
FIG. 13 is a schematic illustration of the pressurization of the plastic melt within the indwelling needle cannula mount with a second gate in accordance with the present application.
Reference numerals: A, first runner, B, second runner, 1, keep somewhere needle sleeve holder, 11, puncture needle file, 12, keep somewhere needle fixed sheath, 13, Y type knot mouth, 2, panel, 3, cover half, 4, movable mould, 5, square iron, 6, oblique guide pillar, 7, thimble board, 81, movable mould benevolence, 811, first movable mould benevolence, 812, second movable mould benevolence, 82, first slider, 821, guide chute, 83, second slider.
Detailed Description
The present application will be further described below based on preferred embodiments with reference to the accompanying drawings.
The terminology used in the description presented herein is for the purpose of describing embodiments of the application and is not intended to be limiting of the application. Unless specifically stated or limited otherwise, the terms "disposed," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, directly connected, indirectly connected via an intermediary, or in communication between two elements. The specific meaning of the above terms in the present application will be specifically understood by those skilled in the art.
In addition, in the description of the embodiments of the present application, various components on the drawings are enlarged or reduced for the convenience of understanding, but this is not intended to limit the scope of the present application.
In the actual production process, the preparation of the indwelling needle sleeve seat is generally realized through an injection molding technology of a total hot runner. The full hot runner injection molding technology has the advantages of accurate melt flow control, less gate mark, good product quality and the like, and is the main stream technology of the current injection molding of the indwelling needle sleeve seat.
Fig. 1 is a general structural view of a conventional indwelling needle cannula holder 1 having a first gate a, and as shown in fig. 1, the indwelling needle cannula holder 1 includes a puncture needle holder 11, an indwelling needle fixing sheath 12 and a Y-shaped junction 13, the puncture needle holder 11 and the indwelling needle fixing sheath 12 are coaxially arranged, and the Y-shaped junction 13 is communicated with a side edge of the indwelling needle fixing sheath 12. The structure of the indwelling needle cannula holder 1 is prior art and will not be further described here.
Fig. 2 is a schematic view showing the flow direction of the plastic melt in the retaining pin sleeve holder 1 with the first gate a in fig. 1, as shown in fig. 2, the first gate a is disposed on the retaining pin fixing sheath 12, and the selection of the position of the first gate a may cause the following problems:
stress concentration in the injection molding process, the melt receives larger shearing force and pressure at the first gate A, and stress concentration is easy to generate at the first gate A and the opposite position. Over time, these stresses may build up and cause the material to crack.
And (3) the gate mark is formed in the injection molding process, and after the plastic melt enters the mold cavity from the gate, the plastic melt flows and fills the periphery. Since the melt is injected first and at a higher temperature at the first gate a, the opposite position is where the melt is converged last. In this process, when two or more melts meet, the leading edge portion has cooled and is not sufficiently fused, so that a significant dissolution mark is formed at a position opposite to the first gate a, which affects the appearance and performance of the article.
And the pouring gate is cracked, namely, under the use scene of the product, the inner hole corresponding to the first pouring gate A bears the important function of interference fit with other components, and the purpose of realizing firm and reliable connection between the components in an interference fit mode is achieved. However, because the potential problems of stress concentration, uneven material structure and the like exist in the pouring gate position during injection molding, when interference assembly is performed, the external force born by the inner hole is overlapped with the molding residual stress, so that the stress born by the position exceeds the bearing limit of the material, the probability of cracking of a finished product is finally increased, and the quality and the service life of the product are affected.
In order to solve the above-mentioned problems, it is necessary to optimize and improve the existing gate position (i.e., the first gate a) selection to improve the quality and safety of the indwelling needle cannula holder. Through reasonable design runner position, can reduce stress concentration, improve material performance difference, optimize structural design to reduce the risk of keeping somewhere the needle sleeve seat fracture in ageing test, improve its performance and security.
Fig. 3 is a general structural view of the indwelling needle sleeve seat 1 with the second gate B according to the present application, and as shown in fig. 3, the present application adjusts the existing gate position (first gate a) to the second gate B position to solve the problems existing in the existing gate position.
The gate position in the claims is specifically referred to as the second gate B herein.
Specifically, as shown in fig. 3, the second gate B is provided at a position corresponding to the Y-junction 13.
Fig. 4 is a schematic view of the flow direction of the plastic melt in the retaining pin sleeve seat 1 with the second gate B in fig. 3, and as shown in fig. 4, the gate position is set at a position corresponding to the Y-shaped junction 13, and the reasonable second gate B position enables the plastic melt to be more uniformly distributed when filling the cavity, so that three problems of stress concentration, gate mark appearance and gate breakage existing in the existing gate can be improved fundamentally.
From the aspect of stress concentration, the position of the second gate B is more reasonable in the structure of the die, and when the melt flows in, the space structure is favorable for the melt to be more uniformly dispersed, so that the excessive concentration of the melt in a local area is avoided, and the peak value of the shearing force and the pressure is greatly reduced. Compared with the first gate A, when the melt flows through the second gate B corresponding to the Y-shaped junction 13 to enter the cavity, the melt can flow to the periphery in a more balanced mode, so that the stress of the whole cavity in the injection molding process is more uniform, the occurrence of stress concentration phenomenon is reduced, and the risk of cracking of the material due to stress accumulation is reduced.
The unique configuration of the Y-junction 13 optimizes the flow path of the melt for gate mark issues. After the melt enters from the second gate B, the flow front of the melt in the cavity is more consistent due to the flow dividing effect of the Y-shaped junction 13, so that the uneven cooling condition of the melt in the cavity caused by the flow difference is reduced. In the filling process, the Y-shaped junction 13 guides the melt to fill the cavity in a more orderly manner, so that the possibility that the front cooling cannot be fully fused when multiple melt strands meet is reduced, the melt is easier to be completely and uniformly fused in the cavity, and then the dissolution mark frequently occurring at the position opposite to the second gate B is radically reduced or even eliminated.
In addition, in the assembly process of the product, a piston needs to be assembled in the inner hole at the first gate A, and the first gate A is in interference fit, so that the risk of cracking is further increased.
Further, the position of the second gate B at the Y-shaped junction 13 is comprehensively determined based on the temperature and the fluidity of the plastic melt, so that the molding effect of the plastic melt in the cavity is ensured. The temperature of the plastic melt directly influences the molding state, if the temperature is too high, heat generated by the severe friction between the plastic and the wall surface of the mold can not be timely emitted when the plastic is rapidly filled into the mold cavity, and the molded indwelling needle sleeve seat 1 is extremely easy to cause coking, discoloration and other deterioration phenomena, so that the appearance of the product is influenced, the internal structural strength of the product is further damaged, the use safety is reduced, otherwise, when the temperature is insufficient, the viscosity of the plastic melt is obviously increased, the fluidity is greatly reduced, and the plastic melt is cooled and solidified in advance when the mold cavity is not completely filled, so that the defects of product shortage, surface depression and the like are caused. Meanwhile, the fluidity of the plastic melt is not ignored, when the fluidity is good, the melt can flow in the cavity more smoothly and evenly fill all corners, but if the fluidity is inhibited by factors such as temperature, mold structure and the like, the molding quality is also affected. Therefore, the position of the second gate B at the Y-shaped junction 13 is comprehensively determined based on the temperature and the fluidity of the plastic melt, so that the material deterioration can be avoided through reasonable temperature control, and the melt flow path can be optimized by means of the proper gate position, so that the plastic melt is fully and uniformly filled in the cavity, and the high-precision and high-quality molding effect of the retaining needle sleeve seat 1 is realized. Specifically, reference is made to fig. 12 for the test parameters in the actual production process.
In a part of the preferred embodiment of the present application, as shown in fig. 13, the pressure of filling the plastic melt through the second gate B is set to 32.4Mpa, which can ensure that the plastic melt is fully and uniformly filled in the cavity, avoid the defects of mold loss or flash of the product caused by over-high pressure, and prevent the problems of incomplete filling caused by insufficient pressure.
In some preferred embodiments of the present application, the length of the second gate B from the connection position of the Y-shaped junction 13 and the retaining needle fixing sheath 12 is one third of the total length of the Y-shaped junction 13, where the Y-shaped junction 13 is disposed, the injection pressure of the product is minimum, and the dissolution position is more reasonable.
In some preferred embodiments of the present application, the outer diameter of the second gate B is set to 1.2mm. The size can meet the flowing requirement of the plastic melt in the cavity, ensure the high efficiency and smoothness of the filling process, solidify the sealing material in time after the melt is filled, avoid the problems of flash and the like, and simultaneously, the reasonable size also provides convenience for removing the gate trace subsequently and is beneficial to improving the appearance quality of the product.
In some embodiments of the present application, the second gate B is in the form of a full hot runner needle valve gate, which has the advantages of low plastic filling pressure, low gate residue and attractive appearance.
Based on the above position setting of the second gate B, the present application provides an injection molding method and an injection molding apparatus for the indwelling needle cannula holder 1, which perform injection molding using the injection molding method. In order to facilitate understanding of the actions and the coordination relationship of each structure in the injection molding method, the structure of the injection molding device in the present application will be described first.
Fig. 5 and 6 show an overall structure diagram and an exploded view of an injection mold in the present application, respectively, and as shown in fig. 5 and 6, the injection mold includes a panel 2, a fixed mold 3, a movable mold 4, a square iron 5, an inclined guide pillar 6, an ejector plate 7 and a hot runner system, and a cavity of an injection molding retaining needle sleeve seat 1 is formed between the fixed mold 3 and the movable mold 4.
The panel 2 is positioned at the forefront end of the fixed die 3 and is used for providing support and positioning for the hot runner system, so that the hot runner system and other parts of the injection mold keep a relatively fixed position relation; the injection molding machine comprises a fixed die 3, a movable die 4, a fixed die 3, a nozzle and other parts, wherein the fixed die 3 is provided with a hot runner, a plastic melt is injected into the cavity through the nozzle, the movable die 4 drives a molded retaining needle sleeve seat 1 to synchronously move and separate from the fixed die 3 when being opened, a square iron 5 is a part connected with the fixed die 3 and the movable die 4 and is arranged between a bottom plate of the fixed die 3 and a bottom plate of the movable die 4, the functions of supporting and spacing are achieved, the distance between the movable die 4 and the fixed die 3 is determined, a movement space of an ejector plate 7 is formed, one end of an inclined guide post 6 is fixed on the movable die 4, the other end of the inclined guide post passes through a first sliding block of the fixed die 3, and when the die is opened, the inclined guide post 6 is matched with an inclined hole on the sliding block, so that the first sliding block moves laterally, the molded retaining needle sleeve seat 1 can be smoothly demoulded, the ejector pin of the injection machine is pushed by an ejector pin 7 and the ejector pin of the injection machine is pushed out of the molded retaining needle seat 1 from the die cavity, the hot runner system is fixed on one side of the fixed face plate 3, and the other end of the runner passes through the face plate 2, and the runner passes through the first sliding block of the injection runner and the injection molding machine.
Specifically, as shown in fig. 7 and 8, the cavity includes a fixed mold core, a movable mold core 81, a small core and a first slider 82, wherein the fixed mold core is used for forming the outer surface of the indwelling needle cannula holder 1, the movable mold core 81 is used for forming the inner surface of the indwelling needle cannula holder 1, and the small core is used for forming a local detail cavity of the indwelling needle cannula holder 1.
In the present application, the small core corresponds to the retention needle fixing sheath 12, and the small core is connected to the movable mold 4 through the fixing mechanism. The small core is used for forming a cavity channel for fixing the retention needle in the retention needle fixing sheath 12, and is connected with the movable mould 4 through a fixing mechanism such as a bolt and the like so as to realize synchronous movement with the movable mould 4.
In the demolding process, the ejector pin plate 7 pushes the ejector pins to move, the molded remaining needle sleeve seat 1 is ejected out of the driven mold core 81, and the first sliding block 82 synchronously completes lateral core pulling.
In some specific embodiments of the present application, as shown in fig. 7 and 8, since the indwelling needle sleeve seat 1 is designed in a Y-shaped structure, in order to adapt to the structural feature, the existing mold cavity adopts a circumferential wrapping layout manner, and the first slider 82 in the layout manner accomplishes the lateral core pulling by directly acting on the movable mold core 81. The annular arrangement of the cavities enables radial distribution of the hot runner system, so that efficient filling of the mould is achieved in both directions.
Specifically, the Y-shaped indwelling needle cannula holder 1 has two branch directions, and injection molding is required from different angles. The circumferentially surrounding cavity layout can precisely match this structural requirement so that the hot runner system can uniformly inject molten material into the mold from multiple directions.
However, with the development trend of miniaturization and precision of medical instruments, the defects of the existing layout schemes are increasingly prominent. Taking a typical phi 300mm diameter mold as an example, the 8 cavities arranged circumferentially occupy only 52% of the effective projected area. The unused fan-shaped spacer areas form a large amount of dead space, with an area ratio of up to 48%. This arrangement results in a limited yield per unit area of the die, and a single-die molding yield is reduced by about 40% from the theoretical maximum at the same tonnage of the equipment.
Based on the problem of low space utilization rate of the existing cavity layout, the circumferential wrapping layout mode is adjusted.
As shown in fig. 9, the application optimizes the layout of the mold cavity, and adopts a double-row straight line side-by-side layout mode. Compared with the traditional layout, the design has the core advantages that the fan-shaped gap is thoroughly eliminated, and the space utilization rate is remarkably improved. Taking a typical phi 300mm diameter die as an example, when the die cavities are arranged in a double-row straight line, invalid sector areas generated by radial arrangement in circumferential layout are avoided by closely and orderly distributing each die cavity along two parallel straight lines. The layout not only ensures that the arrangement of the cavities is more regular and compact, fully utilizes the internal space of the die and reduces the material waste, but also creates more reasonable space conditions for the arrangement of the auxiliary structures of the die such as a hot runner system, a cooling pipeline and the like, thereby being beneficial to improving the overall performance and the production efficiency of the die.
In addition, the layout mode also simplifies the arrangement of the hot runner system. Specifically, the hot runner can extend to each side-by-side cavity in a straight line direction, reducing bending structure, length loss and runner pressure loss.
Specifically, the number of the first sliding blocks 82 corresponds to the number of the oblique guide posts 6, the first sliding blocks 82 are arranged in a plurality of rows, the first sliding blocks 82 are connected with the oblique guide posts 6 through oblique holes, and the first sliding blocks 82 are provided with oblique guide grooves 821. According to the application, the inclined slide guide groove 821 can convert the original horizontal pushing direction of the first sliding block 82 into the inclined movement matched with the Y-shaped branch. Through the angle conversion mechanism, even if the mold cavities adopt a straight line side-by-side layout, two branches of the Y-shaped structure can be smoothly pulled out along the respective axial directions in the demolding process, so that the generation of sector gaps in the traditional circumferential layout is avoided.
Further, as shown in fig. 10, the movable mold core 81 is slidably connected to the slide guiding slot 821 through the second slider 83. When the die is opened, the inclined guide post 6 is matched with the inclined hole on the first sliding block 82, so that the first sliding block 82 moves laterally, and the second sliding block 83 is driven to move along the extending direction of the sliding guide groove 821 through the sliding guide groove 821, so that the movable die core 81 is driven to be separated from the molding retaining needle sleeve seat 1.
Further, the movable mold core 81 includes a first movable mold core 811 and a second movable mold core 812, the first movable mold core 811 corresponds to the puncture needle seat 11, the second movable mold core 812 corresponds to the Y-shaped junction 13, and the first movable mold core 811 and the second movable mold core 812 intersect at an acute angle to be matched with the structure of the indwelling needle cannula seat 1.
Further, the first movable mold 811 is connected to an output end of the first driving mechanism, and the first driving mechanism can drive the first movable mold 811 to reciprocate along the extending direction of the first movable mold 811.
In some specific embodiments of the application, the first drive mechanism is a hydraulic cylinder, an air cylinder, a linear motor, or the like. In actual production, the adaptive linear reciprocating motion driving mechanism can be selected based on actual requirements.
Further, the second movable mold core 812 is connected to the second slider 83 near one end of the first slider 82.
In some preferred embodiments of the present application, the extending direction of the second slider 83 is perpendicular to the extending direction of the second movable mold core 812. On the one hand, the vertical layout provides a more reasonable force transmission path for the driving system of the inclined guide pillar 6, and when the inclined guide pillar 6 drives the first sliding block 82 to move laterally, the vertically arranged second sliding block 83 can accurately convert the moving direction into the extraction direction of the second movable mold core 812, so that the smooth demolding of the branch part of the Y-shaped structure retaining needle sleeve seat 1 is ensured.
Further, the included angle between the sliding guide groove 821 and the horizontal plane is complementary to the included angle between the Y-shaped junction 13 and the puncture needle stand 11.
Based on the structure of the injection molding device, the structure of the indwelling needle cannula holder 1 and the position setting of the second gate B, the application also provides an injection molding method of the indwelling needle cannula holder 1, as shown in FIG. 11, which comprises the following steps:
S1, establishing a cavity based on the shape of a retaining needle sleeve seat 1, and setting the position of the cavity corresponding to a Y-shaped junction as a second gate B of a hot runner system;
s2, injecting plastic melt into the cavity from a second gate B through a hot runner system;
s3, after the indwelling needle sleeve seat 1 in the cavity is cooled and molded, controlling the movable die to move along the direction away from the fixed die, and completing the die opening action;
s4, driving the ejector plate to move along the direction close to the fixed die, and ejecting the molded remaining needle sleeve seat 1 from the cavity;
s5, respectively resetting the ejector plate and the movable mould, and preparing for entering the next injection molding cycle;
and S6, repeating the steps S1-S5 until the production of the preset number of the indwelling needle sleeve seats 1 is completed.
While the foregoing is directed to embodiments of the present application, other and further embodiments of the application may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202511247589.XA CN120816673A (en) | 2025-09-02 | 2025-09-02 | Injection molding method and device for indwelling needle cannula seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202511247589.XA CN120816673A (en) | 2025-09-02 | 2025-09-02 | Injection molding method and device for indwelling needle cannula seat |
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| CN120816673A true CN120816673A (en) | 2025-10-21 |
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| CN202511247589.XA Pending CN120816673A (en) | 2025-09-02 | 2025-09-02 | Injection molding method and device for indwelling needle cannula seat |
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- 2025-09-02 CN CN202511247589.XA patent/CN120816673A/en active Pending
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