Injection molding device for forming medical polymer puncture frame

Abstract

The invention discloses a forming injection molding device for a medical polymer puncture frame, relates to the technical field of forming injection molding, and aims to solve the technical problem that a traditional guide channel is of an equal-diameter straight pipe structure, and the puncture precision is insufficient. According to the invention, the stepped inner cavity is matched with the embossed concave plate, so that the precise stepped reducing and low-friction inner wall is formed at one time, and the puncture precision is improved; the extrusion mechanism is bidirectionally driven to ensure complete molding and lossless demolding of the convex patterns, so that the product qualification rate is improved; the pressure buffering mechanism reduces micro-convex pattern gaps through pressure regulation and control, so that the integrity and the injection molding quality are improved; the reverse mold mechanism realizes automatic demolding through elastic deformation, the demolding time is shortened, and structural damage is avoided; the bending joints optimize the performance of the embossed concave plate, prolong the service life of the embossed concave plate and reduce the damage rate of the micro-embossed concave plate; through the design, the problems that precision and functionality of traditional equipment are difficult to consider, demolding is prone to damage and the like are solved, production efficiency and product stability are improved, and reliable structural guarantee is provided for puncture operation.

Description

Technical Field

[0001] This invention relates to the field of molding and injection molding technology, and more specifically, to a molding and injection molding device for a medical polymer puncture frame. Background Technology

[0002] In clinical interventional diagnosis and treatment, for large abscesses or cysts with a diameter >5cm in the abdominal cavity, pelvic cavity, liver and other parts of the body, it is often necessary to use a large-diameter puncture frame (which can accommodate 12-16Fr drainage tubes or 10-15mm operating channels) to complete operations such as pus drainage, biopsy or foreign body retrieval. As the core component of the puncture frame, the guide channel is usually made by injection molding separately and then assembled as a whole to ensure structural accuracy. However, the existing structural design and injection molding manufacturing method of the guide channel have revealed significant defects when dealing with complex clinical needs. Traditional guide channels are straight tubes of equal diameter, which result in insufficient puncture accuracy. Radial wobble is prone to occur when the puncture needle is advanced, especially for long puncture needles, with deviations reaching 1-2 mm. For punctures of deep lesions (such as the liver and kidneys), this may cause the needle tip to deviate from the target position, increasing the risk of tissue damage or infection. Furthermore, existing guide channels typically have smooth inner walls, resulting in significant frictional resistance with the puncture needle surface. This not only affects the feel of operation but can also exacerbate wobbling due to uneven force distribution. Additionally, the guide channels of large-diameter puncture frames have unique dimensions, making it difficult for existing injection molding equipment to balance precision and functionality during manufacturing. This hinders the smooth transition of stepped diameter changes and the precise molding of micro-textures on the inner wall, further limiting the improvement of guide channel performance. With the increasing demands for precision and efficiency in interventional diagnosis and treatment, traditional guide channels are no longer sufficient to meet the diagnostic and treatment needs of large abscesses or cysts. Therefore, we propose a molding injection device for a medical polymer puncture frame. Summary of the Invention

[0003] The purpose of this invention is to provide a molding injection device for a medical polymer puncture frame, so as to solve the technical problem of insufficient puncture accuracy caused by the traditional guide channel being a straight tube structure with equal diameter.

[0004] To solve the above technical problems, the present invention provides the following technical solution: a molding injection device for a medical polymer puncture frame, comprising an upper mold and a lower mold, wherein multiple injection cavities are provided on adjacent sides of the upper mold and the lower mold, an inner cavity is provided inside the injection cavity, and an end-sealing plate fixed to the lower mold is provided on one side of the inner cavity, and a demolding cavity is provided between the ends of the multiple injection cavities away from the end-sealing plate; The inner cavity has a stepped diameter decreasing structure. Multiple lifting grooves are formed on the outer periphery of the inner cavity. A lifting top plate is slidably limited on the inner periphery of the lifting groove. A cavity is formed on the inner wall of the lifting top plate. A textured concave plate is installed on the inner periphery of the cavity. The interior of the textured concave plate is designed to be concave. The inner cavity is hollow. A fixed seat is installed on the inner wall of the inner cavity near multiple cavities. A lifting column fixed to the lifting top plate is slidably limited on the outer periphery of the fixed seat. A displacement seat fixed to the lifting column is slidably limited inside the fixed seat. A pressing mechanism is provided on one side of the displacement seat. The pressing mechanism includes a straight handle plate. A tilting surface is provided on one side of the straight handle plate. An extension section extends from the tilting surface. An L-shaped inner extrusion plate is installed on the extension section. A central drive shaft is provided at the center of the inner cavity. The outer periphery of the central drive shaft is connected to the side walls of the multiple pressing mechanisms.

[0005] Preferably, the inner wall of the displacement seat has a sliding cavity, one side of the sliding cavity is provided as an inner sliding wall, and one side of the displacement seat is provided with an outer sliding wall.

[0006] Preferably, a synchronous connecting plate is connected between one end of the plurality of central drive shafts, and a drive structure is also provided on one side of the synchronous connecting plate.

[0007] Preferably, a pressure-relieving mechanism is provided on one side of the textured concave plate. The pressure-relieving mechanism consists of a pressure-receiving component and a pressure-receiving component. The textured concave plate is made of an elastic metal material.

[0008] Preferably, the pressure-bearing component includes a pressure plate located on one side of the textured concave plate, and a plurality of sliding rods that slide and limit the fixed seat are connected to one side of the pressure plate. A pressure buckle is installed at the center of one side of the pressure plate, and the pressure buckle has a through opening.

[0009] Preferably, the pressing member includes a rotating wheel fixed to a fixed base by a bracket. The outer periphery of the rotating wheel is connected to a segment of the same arc, which is an arc shape with the same diameter. One end of the segment of the same arc is connected to a gradient segment, which is an arc shape with an increasing diameter. The end of the gradient segment is integrally formed with a protrusion. The segment of the same arc and the gradient segment can slide within the through-hole.

[0010] Preferably, the circumference of the same arc segment is the same as the distance segment of the inner extrusion plate extrusion displacement seat, and the straight handle plate is meshed with the outer circumference of the rotating wheel by gears on the side near the pressure plate.

[0011] Preferably, a plurality of serpentine grooves are provided between the inner cavity and the end plate, and a molding mechanism is provided on the inner circumference of the serpentine grooves.

[0012] Preferably, the molding mechanism includes a composite spring sheet that is integrally corresponding to the serpentine groove. The composite spring sheet has multiple wave-shaped composite shapes. One end of the composite spring sheet is connected to a top pull plate, which is embedded in one side of the end cap plate. The other end of the composite spring sheet extends and is connected to a straight connecting piece. One end of the multiple straight connecting pieces is connected to a ring plate fixed to the central drive shaft. The composite spring sheet and the straight connecting piece are made of elastic material.

[0013] Preferably, the textured concave plate has bending joints on both sides, and the bending joints are protruding.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention utilizes the synergistic effect of a stepped, decreasing diameter inner cavity and a textured concave plate to create a puncture frame guide channel that combines precise stepped diameter changes with micro-textured inner walls in a single molding process. The stepped structure ensures a smooth transition between different diameter segments, preventing wobbling caused by uneven force on the puncture needle. The micro-textured pattern reduces the contact area between the puncture needle and the inner wall of the channel, lowering frictional resistance and improving the operating feel. Compared to traditional smooth channels, this structure improves puncture accuracy and solves the problem of large-diameter puncture frame guide channels struggling to balance accuracy and functionality. It provides a structural foundation for the stability of puncture operations and addresses the issue of insufficient puncture accuracy in traditional guide channels, which are straight tubes with uniform diameter.

[0015] 2. This invention also achieves the opening and closing of the lifting top plate through the bidirectional movement of the inclined top surface of the straight handle plate and the inner extrusion plate. When opening, it ensures that the embossed concave plate is fully embedded in the molten material, ensuring the integrity of the micro-embossed pattern. When closing, it separates the embossed concave plate from the formed embossed pattern, avoiding structural interference during demolding. The linkage between the synchronous connecting plate and the central drive shaft ensures that the actions of multiple mechanisms are consistent, improving the demolding success rate. It solves the problem that the tenon-shaped embossed pattern in the annular array is easily damaged, and significantly improves the product qualification rate.

[0016] 3. This invention also controls the pressure of the pressure plate on the convex and concave plates by alternating the action of the gradual transition section and the same arc section. When pressing, the concave plate is opened to avoid air retention. When resetting, the material is guided to fill evenly, reducing the gaps in the micro-convex pattern. The concave plate made of elastic metal material cooperates with the pressure change to achieve gradual molding, which improves the integrity of the micro-convex pattern and the injection molding quality. It solves the injection molding defects caused by the small internal space of the convex concave plate, ensures the stability of the convex pattern structure, and provides a reliable guarantee for reducing puncture friction.

[0017] 4. This invention also utilizes the elastic deformation of the stacked spring sheets to ensure the sealing and positioning of the top pull plate during injection molding through tension, thus ensuring the complete molding of the guide channel end. During demolding, the stacked extrusion generates a pushing force, which, in conjunction with the contraction action of the lifting top plate, enables the piercing frame to detach without damage. This design greatly shortens the demolding time and avoids end adhesion or structural damage caused by traditional demolding methods. At the same time, it can be synchronized with other mechanisms to improve the automation level and production efficiency of the device.

[0018] 5. This invention also uses the bending joints on both sides of the textured concave plate as elastic fulcrums to enhance the directional deformation capability of the concave plate, making the convex movement and reset smoother and reducing fatigue damage; its convex shape guides the material to flow towards the center, reducing air retention at the edges and corners; it separates from the central area before demolding to avoid tearing of the convex texture. This design extends the service life of the concave plate, reduces the damage rate of micro-convex textures, further improves the molding quality and equipment durability, and ensures that the puncture frame can play a long-term stable guiding role. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of a single internal cavity in this invention.

[0021] Figure 3 This is a schematic diagram of a half-section of a single internal cavity in this invention.

[0022] Figure 4 In this invention Figure 3 A magnified view of part A in the middle.

[0023] Figure 5 This is a schematic diagram of the arrangement structure of the lifting roof section in this invention.

[0024] Figure 6 This is a schematic diagram of the molding mechanism in this invention.

[0025] Figure 7 This is a schematic diagram of the connection structure between the extrusion mechanism and the lifting top plate in this invention.

[0026] Figure 8 This is a schematic diagram of the internal groove structure of the inner cavity in this invention.

[0027] Figure 9 This is a schematic diagram of the lifting top plate in the state of waiting to be injected into the mold in this invention.

[0028] Figure 10 This is a schematic diagram of the structure of the lifting top plate in the final stage of injection molding in this invention.

[0029] Figure 11 This is a schematic diagram of the lifting top plate in the demolded state in this invention.

[0030] Figure 12 This is a schematic diagram of the extrusion mechanism in this invention.

[0031] Figure 13 This is a schematic diagram of the pressure-relieving mechanism in this invention.

[0032] Figure 14 This is a schematic diagram of the embossed concave plate in its normal state in this invention.

[0033] Figure 15 This is a schematic diagram of the structure of the textured concave plate in the present invention when it is in a flat-top state.

[0034] Figure 16 This is a half-section diagram of the guide channel for the finished product processed in this invention.

[0035] Description of the numbers in the figure: 1. Upper mold; 2. Lower mold; 3. Injection cavity; 4. Inner cavity; 5. End plate; 6. Demolding cavity; 7. Lifting top plate; 8. Fixed seat; 9. Lifting column; 10. Displacement seat; 11. Extrusion mechanism; 12. Pressure relief mechanism; 13. Demolding mechanism; 18. Embossed concave plate; 181. Bending joint; 81. Central drive shaft; 119. Synchronous connecting plate; 101. Sliding top cavity; 102. Inner sliding top wall; 103. Outer sliding top wall; 111. Straight handle plate; 112. Inclined top surface; 113. Extension section; 114. Inner extrusion plate; 121. Pressure-bearing component; 1211. Pressure plate; 1212. Sliding rod; 1213. Pressure buckle; 122. Top-pressing component; 1221. Rotating wheel; 1222. Same arc segment; 1223. Gradient segment; 131. Overlapping spring sheet; 132. Top pull plate; 133. Straight connecting piece; 134. Ring plate. Detailed Implementation

[0036] like Figures 1 to 16 As shown, the present invention relates to a molding injection device for a medical polymer puncture frame, comprising an upper mold 1 and a lower mold 2. The upper mold 1 is also provided with an injection port. Cooling channels are provided inside the upper mold 1 and the lower mold 2. The end of the cooling channel is connected to the coolant through an interface and a pipe and is delivered by a pump. The mold closing between the upper mold 1 and the lower mold 2 is driven by a hydraulic rod or other driving device. Multiple injection cavities 3 are provided on adjacent sides of the upper mold 1 and the lower mold 2. An inner cavity 4 is provided inside the injection cavity 3. An end-sealing plate 5 fixed to the lower mold 2 is provided on one side of the inner cavity 4. An ejection cavity 6 is provided between the ends of the multiple injection cavities 3 away from the end-sealing plate 5. The inner cavity 4 has a stepped diameter decreasing structure. Multiple lifting grooves are provided on the outer periphery of the inner cavity 4. A lifting top plate 7 is slidably limited on the inner periphery of the lifting groove. A cavity is provided on the inner wall of the lifting top plate 7. A textured concave plate 18 is installed on the inner periphery of the cavity. The interior of the textured concave plate 18 is designed to be concave.

[0037] Working principle: After the upper mold 1 and lower mold 2 are driven to close by a hydraulic rod, the molten medical polymer material is injected into the injection cavity 3 through the injection port. The inner cavity 4 inside the injection cavity 3 adopts a stepped diameter decreasing structure, which can directly form a stepped guide channel for the puncture frame during the molding process, ensuring a smooth transition between different diameter segments and avoiding the problem of uneven force on the puncture needle caused by abrupt changes in size in traditional smooth channels. In the lifting groove of the inner cavity 4, the lifting top plate 7 slides along the limiting trajectory. The textured concave plate 18 (with a recessed design inside) installed in the cavity of its inner wall comes into contact with the molten material during injection, so that the inner wall of the puncture frame guide channel forms a corresponding micro-textured structure. These micro-textured textures can reduce the contact area between the puncture needle and the inner wall of the channel, reduce frictional resistance, improve the operating feel, and at the same time, the evenly distributed textures enhance the guiding constraint on the puncture needle and reduce shaking.

[0038] The raised texture formed during injection molding of the above-mentioned raised textured concave plate 18 is embedded inside the raised textured concave plate 18, which will produce a ring-shaped array of inner tenons. This will cause the raised texture structure to be destroyed during demolding. In order to facilitate demolding, the following design is adopted.

[0039] The inner cavity 4 is hollow. A fixed seat 8 is installed on the inner wall of the inner cavity 4 near the multiple cavities. A lifting column 9 fixed to the lifting top plate 7 is slidably limited on the outer periphery of the fixed seat 8. A displacement seat 10 fixed to the lifting column 9 is slidably limited inside the fixed seat 8. A sliding top cavity 101 is opened on the inner wall of the displacement seat 10. An inner sliding top wall 102 is set on one side of the sliding top cavity 101, and an outer sliding top wall 103 is set on one side of the displacement seat 10.

[0040] A pressing mechanism 11 is provided on one side of the displacement seat 10. The pressing mechanism 11 includes a straight handle plate 111. A tilting surface 112 is provided on one side of the straight handle plate 111. When the tilting surface 112 passes the outer sliding top wall 103, it will push the displacement seat 10 upward until the top of the straight handle plate 111 is in contact with the bottom of the displacement seat 10, making it fully open. At this time, the lifting top plate 7 is fully opened. The tilting surface 112 extends into an extension section 113. An L-shaped inner extrusion plate 114 is installed on the extension section 113. When the inner extrusion plate 114 moves toward the inner sliding top wall 102, it will press against the inner sliding top wall 102, causing the displacement seat 10 to... It should be noted that the tilt of the tilting surface 112 matches the descent of the displacement seat 10, and there will be no interference. Further descent of the displacement seat 10 causes the lifting top plate 7 to contract inward, so that the raised texture structure separates from the raised texture concave plate 18 during demolding, and there is no longer any constraint. A central drive shaft 81 is provided in the center of the inner cavity 4. The outer periphery of the central drive shaft 81 is connected to the side wall of multiple extrusion mechanisms 11. A synchronous connecting plate 119 is connected between one end of the multiple central drive shafts 81. A drive structure is also provided on one side of the synchronous connecting plate 119. The drive structure can be a hydraulic rod, an electric telescopic rod, etc.

[0041] Working principle: During the injection molding stage, the central drive shaft 81, driven by the drive structure (such as a hydraulic rod), links multiple extrusion mechanisms 11 to move synchronously through the synchronous connecting plate 119. The straight handle plate 111 of the extrusion mechanism 11 first contacts the outer sliding top wall 103 of the displacement seat 10 with the inclined top surface 112. It uses the inclined angle to push the displacement seat 10 to rise along the limiting trajectory of the fixed seat 8, thereby driving the lifting column 9 to push the lifting top plate 7 to slide outward along the lifting groove of the inner cavity 4. When the top of the straight handle plate 111 is completely in contact with the bottom of the displacement seat 10, the lifting top plate 7 reaches the maximum open state. At this time, the concave structure of the embossed concave plate 18 is completely embedded in the molten material, so that the inner wall of the puncture frame forms an inner tenon-shaped embossed pattern in a ring array.

[0042] During the demolding stage, the drive structure reverses the drive of the central drive shaft 81, causing the extrusion mechanism 11 to reset. The extension section 113 of the straight handle plate 111 moves along with it, causing the L-shaped inner extrusion plate 114 to gradually approach the inner sliding top wall 102 of the displacement seat 10 and apply pressure. Since the tilt angle of the tilting surface 112 matches the descent trajectory of the displacement seat 10, when the inner extrusion plate 114 extrudes the inner sliding top wall 102, the displacement seat 10 descends smoothly along the fixed seat 8. The lifting column 9 pulls the lifting top plate 7 inward to retract. During the retraction of the lifting top plate 7, the raised concave plate 18 and the inner tenon-shaped raised pattern of the inner wall of the piercing frame gradually separate, eliminating the structural constraints during demolding and preventing the raised pattern from being damaged due to forced detachment.

[0043] Because the space inside the raised concave plate 18 is small, it is very easy for voids and air to be trapped during injection molding, which affects the quality of the micro-raised texture. To address this issue...

[0044] A pressure-relieving mechanism 12 is provided on one side of the textured concave plate 18. The pressure-relieving mechanism 12 consists of a pressure-receiving component 121 and a top-pressing component 122. The textured concave plate 18 is made of elastic metal material.

[0045] The pressure-bearing component 121 includes a pressure plate 1211 located on one side of the textured concave plate 18. A plurality of sliding rods 1212 are connected to one side of the pressure plate 1211 and slide relative to the fixed base 8. The plurality of sliding rods 1212 serve to limit the pressure plate 1211. A pressure buckle 1213 is installed at the center of one side of the pressure plate 1211. The pressure buckle 1213 has a through opening.

[0046] The top pressing component 122 includes a rotating wheel 1221 fixed to the fixed base 8 by a bracket. The outer periphery of the rotating wheel 1221 is connected to a segment 1222 of the same arc, which is an arc shape with the same diameter. One end of the segment 1222 is connected to a transition segment 1223, which is an arc shape with an increasing diameter. The end of the transition segment 1223 is integrally formed with a protrusion. The segment 1222 and the transition segment 1223 can slide within the through opening. The periphery of the segment 1222 is the same as the distance segment of the inner extrusion plate 114 pressing the displacement seat 10. The side of the straight handle plate 111 near the pressure plate 1211 is meshed with the outer periphery of the rotating wheel 1221 by gears.

[0047] It should be noted that the circumference of the same arc segment 1222 is the same as the distance of the extrusion displacement seat 10 of the inner extrusion plate 114. The transition segment 1223 and the lifting top plate 7 can be coordinated in time before the contraction displacement occurs, so that the pressure plate 1211 can be raised and lowered through the transition of the transition segment 1223, further controlling the extrusion and separation states of the convex and concave plates 18. Its state is in a mutually coordinated relationship with the lifting top plate 7. When the lifting top plate 7 is fully opened, the pressure plate 1211 presses against the convex and concave plates 18, causing them to convex outward, avoiding the formation of narrow concave spaces, greatly reducing air retention, and making it easier for materials to enter during injection molding. The transition segment 1223 rotates. During the process, the pressure plate 1211 moves, and the elastic material of the textured concave plate 18 allows it to slowly recover. In conjunction with the conveying of the injection molding material, the micro-textured part is gradually injected, improving the injection quality of the micro-textured part. The lifting top plate 7 does not detach from the straight handle plate 111 and remains in the open rotating state. After the textured concave plate 18 is fully recovered, the same arc segment 1222 will be in the through-hole of the pressure buckle 1213. At this time, the lifting top plate 7 begins to retract and move inward. The design of matching the circumference of the same arc segment 1222 with the distance of the inner extrusion plate 114 extrusion displacement seat 10 ensures that the pressure plate 1211 will not interfere with the lifting top plate 7 when it retracts and moves inward, thus creating mutual cooperation.

[0048] Working principle: When the lifting top plate 7 is fully opened under the drive of the extrusion mechanism 11, the straight handle plate 111 drives the rotating wheel 1221 to rotate through gear meshing, so that the gradual section 1223 (diameter-increasing arc) of the top pressure member 122 enters the through hole of the pressure buckle 1213. As the gradual section 1223 continues to slide, its increasing diameter pushes the pressure plate 1211 along the sliding rod 1212 (limited by the fixed seat 8) to move towards the embossed concave plate 18, generating top pressure on the elastic metal embossed concave plate 18. After being squeezed, the embossed concave plate 18 bulges outward, and the originally concave narrow space is opened up to avoid air retention. At the same time, it expands the injection material flow channel, making it easier for the molten material to fill the embossed molding area and reduce the generation of voids.

[0049] During the injection molding process, the rotating wheel 1221 continues to rotate, the gradient section 1223 gradually disengages from the through-hole, and the same arc section 1222 (arc with the same diameter) enters. Since the diameter of the same arc section 1222 is constant, the pressure of the pressure plate 1211 is gradually released, and the embossed concave plate 18 slowly returns to its initial shape due to its own elasticity. This process is synchronized with the filling rhythm of the injection molding material. Through the gradual reset of the embossed concave plate 18, the material is guided to be evenly distributed and accurately filled into the micro-embossed structure, avoiding uneven material distribution caused by instantaneous deformation. At this time, the lifting top plate 7 remains in an open state to ensure the stability of the embossed molding.

[0050] When injection molding is completed and the demolding preparation stage begins, the inner extrusion plate 114 begins to extrude the displacement seat 10, causing the lifting top plate 7 to shrink inward. Since the circumference of the same arc segment 1222 matches the extrusion distance segment of the inner extrusion plate 114 and its diameter is constant, the position of the pressure plate 1211 remains stable and does not interfere with the shrinkage action of the lifting top plate 7. It separates from the micro-protrusion after molding, laying the foundation for smooth demolding in the future.

[0051] To further facilitate demolding, the following structure is added.

[0052] Multiple serpentine grooves are formed between the inner cavity 4 and the end-sealing plate 5. A molding mechanism 13 is provided on the inner circumference of the serpentine grooves. The molding mechanism 13 includes a composite spring sheet 131 that is integrally corresponding to the serpentine groove. The composite spring sheet 131 has multiple wave-shaped composite shapes. One end of the composite spring sheet 131 is connected to a top pull plate 132. The top pull plate 132 can be installed and inserted into the end-sealing plate 5 for limiting and positioning to improve stability. The top pull plate 132 is embedded in one side of the end-sealing plate 5. The other end of the composite spring sheet 131 extends and is connected to a straight connecting piece 133. Multiple straight connecting pieces One end of 133 is connected to a ring plate 134 fixed to the central drive shaft 81. The stacked spring sheet 131 and the straight connecting piece 133 are made of elastic material. When the central drive shaft 81 moves towards the end plate 5, it will pull the stacked spring sheet 131. At this time, the top pull plate 132 is tightened by the tension to ensure the integrity of the injection molding. At this time, the central drive shaft 81 also drives the lifting top plate 7 to open in the direction. The two work together synchronously. When they move in the opposite direction, the wave part is stacked and squeezed, so that the top pull plate 132 pushes open the injection molded guide channel to achieve demolding.

[0053] Working principle: During the injection molding stage, the central drive shaft 81 moves towards the end plate 5 (synchronized with the direction of the drive lifting top plate 7 opening), and pulls the straight connecting piece 133 through the ring plate 134, which in turn drives the stacked spring piece 131 (multiple wave-shaped stacked elastic structures) to extend along the serpentine groove. At this time, the tension of the stacked spring piece 131 is transmitted to the top pull plate 132, so that it is tightly embedded in one side of the end plate 5 and maintains the limiting positioning, ensuring the sealing integrity of the end of the injection cavity 3, preventing the molten material from overflowing from the gap between the end plate 5 and the inner cavity 4, and ensuring the integrity of the guide channel molding.

[0054] During the demolding stage, the central drive shaft 81 moves in the opposite direction (synchronized with the shrinking and demolding action of the lifting top plate 7), and the ring plate 134 pushes the straight connecting piece 133, causing the stacked spring piece 131 to be stacked and squeezed in the wavy part within the serpentine groove. Since the stacked spring piece 131 is made of elastic material, the elastic thrust generated by the stacking is transmitted to the top pull plate 132 through the straight connecting piece 133, causing the top pull plate 132 to be pushed outward from the embedded position of the end plate 5, directly acting on the end of the injection-molded guide channel.

[0055] At this time, the pushing force of the top pull plate 132 and the separation force of the inner wall generated by the contraction of the lifting top plate 7 work together: the top pull plate 132 pushes the piercing frame away from the end plate 5 from the end, and the contraction of the lifting top plate 7 separates the raised concave plate 18 from the micro-raised pattern. The two work together to ensure that the piercing frame can be smoothly demolded along the stepped structure of the inner cavity 4, avoiding damage to the molding structure caused by end adhesion or inner wall friction.

[0056] The embossed plate 18 has bending joints 181 on both sides, and the bending joints 181 are protruding.

[0057] Design advantages of Bending Joint 181 Enhanced structural elastic deformation capability: The bending joint 181 is a convex shape, which can serve as the elastic deformation fulcrum on both sides of the convex concave plate 18, making it easier for the elastic metal concave plate to bend in a directional manner (convex outward) when compressed, and the recovery is smoother, avoiding local fatigue damage caused by rigid deformation.

[0058] Optimize material filling space: The protruding structure of the bending joint 181 can reduce the gap between the two sides of the textured concave plate 18 and the inner cavity 4, guide the molten material to flow towards the micro-textured forming area in the center of the concave plate, and reduce air retention at the corners.

[0059] Assisted demolding and separation: When the lifting top plate 7 retracts, the bending section 181 retracts inward synchronously with the concave plate. Its arc-shaped contour can reduce the frictional resistance with the forming micro-protrusions and avoid damage to the protrusions caused by local adhesion during demolding.

[0060] Working principle: When the pressure plate 1211 of the pressure relief mechanism 12 pushes the textured concave plate 18, the bending joints 181 on both sides of the concave plate form stress concentration areas due to their convex shape, and preferentially undergo elastic bending, causing the entire concave plate to convex outward. During this process, the deformation of the bending joints 181 amplifies the expansion range of the central area of ​​the concave plate, further expanding the micro-convex texture forming space, making it easier for the molten material to fill the concave plate recess and reduce gaps.

[0061] After injection molding is completed, the pressure of the pressure plate 1211 is released, and the textured concave plate 18 slowly contracts under its own elasticity and the restoring force of the bending joint 181. The arc-shaped structure of the bending joint 181 guides the two sides of the concave plate to separate from the molded micro-convex pattern first, and then the central area gradually separates away, avoiding the tearing of the convex pattern caused by the overall hard pulling.

[0062] When the lifting top plate 7 drives the concave plate to retract and demold, the protruding shape of the bending section 181 causes it to form a rolling contact with the inner wall of the lifting groove of the inner cavity 4, reducing sliding friction and ensuring that the concave plate shrinks smoothly, ultimately achieving the non-damaging separation of the textured concave plate 18 and the micro-textured concave plate.

[0063] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A molding injection device for a medical polymer puncture frame, characterized in that, The mold includes an upper mold (1) and a lower mold (2). Multiple injection cavities (3) are provided on adjacent sides of the upper mold (1) and the lower mold (2). An inner cavity (4) is provided inside the injection cavity (3). An end plate (5) fixed to the lower mold (2) is provided on one side of the inner cavity (4). A demolding cavity (6) is provided between the ends of the multiple injection cavities (3) away from the end plate (5). The inner cavity (4) has a stepped diameter decreasing structure. Multiple lifting grooves are provided on the outer periphery of the inner cavity (4). A lifting top plate (7) is slidably limited on the inner periphery of the lifting groove. A cavity is provided on the inner wall of the lifting top plate (7). A textured concave plate (18) is installed on the inner periphery of the cavity. The textured concave plate (18) has a concave shape design inside. The inner cavity (4) is hollow. A fixed seat (8) is installed on the inner wall of the inner cavity (4) near the multiple cavities. A lifting column (9) fixed to the lifting top plate (7) is slidably limited on the outer periphery of the fixed seat (8). A displacement seat (10) fixed to the lifting column (9) is slidably limited inside the fixed seat (8). A pressing mechanism (11) is provided on one side of the displacement seat (10). The pressing mechanism (11) includes a straight handle plate (111). A tilting surface (112) is provided on one side of the straight handle plate (111). An extension section (113) extends from the tilting surface (112). An L-shaped inner extrusion plate (114) is installed on the extension section (113). A central drive shaft (81) is provided at the center of the inner cavity (4). The outer periphery of the central drive shaft (81) is connected to the side wall of the multiple pressing mechanisms (11).

2. The molding injection device for a medical polymer puncture frame according to claim 1, characterized in that, The inner wall of the displacement seat (10) is provided with a sliding top cavity (101), one side of the sliding top cavity (101) is provided with an inner sliding top wall (102), and one side of the displacement seat (10) is provided with an outer sliding top wall (103).

3. The molding injection device for a medical polymer puncture frame according to claim 2, characterized in that, A synchronous connecting plate (119) is connected between one end of the plurality of central drive shafts (81), and a drive structure is also provided on one side of the synchronous connecting plate (119).

4. The molding injection device for a medical polymer puncture frame according to claim 2, characterized in that, A pressure-relieving mechanism (12) is provided on one side of the textured concave plate (18). The pressure-relieving mechanism (12) consists of a pressure-receiving component (121) and a top-pressing component (122). The textured concave plate (18) is made of elastic metal material.

5. The molding injection device for a medical polymer puncture frame according to claim 4, characterized in that, The pressure-bearing component (121) includes a pressure plate (1211) located on one side of the textured concave plate (18). A plurality of sliding rods (1212) that slide and limit the fixed seat (8) are connected to one side of the pressure plate (1211). A pressure buckle (1213) is installed at the center of one side of the pressure plate (1211), and the pressure buckle (1213) has a through opening.

6. The molding injection device for a medical polymer puncture frame according to claim 5, characterized in that, The top pressing member (122) includes a rotating wheel (1221) fixed on a fixed base (8) by a bracket. The outer periphery of the rotating wheel (1221) is connected to a segment (1222) of the same arc, which is an arc shape with the same diameter. One end of the segment (1222) is connected to a gradient segment (1223), which is an arc shape with an increasing diameter. The end of the gradient segment (1223) is integrally formed with a protrusion. The segment (1222) and the gradient segment (1223) can slide within the through opening.

7. The molding injection device for a medical polymer puncture frame according to claim 6, characterized in that, The circumference of the arc segment (1222) is the same as the distance segment of the inner extrusion plate (114) extrusion displacement seat (10). The straight handle plate (111) is close to the pressure plate (1211) and meshes with the outer circumference of the rotating wheel (1221) through gears.

8. The molding injection device for a medical polymer puncture frame according to claim 2 or 7, characterized in that, Multiple serpentine grooves are provided between the inner cavity (4) and the end plate (5), and a molding mechanism (13) is provided on the inner circumference of the serpentine grooves.

9. The molding injection device for a medical polymer puncture frame according to claim 8, characterized in that, The molding mechanism (13) includes a composite spring sheet (131) that is generally corresponding to the serpentine groove. The composite spring sheet (131) has multiple wave-shaped composite shapes. One end of the composite spring sheet (131) is connected to a top pull plate (132). The top pull plate (132) is embedded in one side of the end plate (5). The other end of the composite spring sheet (131) extends and is connected to a straight connecting piece (133). One end of the multiple straight connecting pieces (133) is connected to a ring plate (134) fixed to the central drive shaft (81). The composite spring sheet (131) and the straight connecting piece (133) are made of elastic material.

10. The molding injection device for a medical polymer puncture frame according to claim 9, characterized in that, The embossed concave plate (18) has bending joints (181) on both sides, and the bending joints (181) are protruding.

Images