Threaded hole forming structure of medical disposable sterile pelvic floor anastomat injection mold

Abstract

The utility model discloses a threaded hole forming structure of a medical disposable sterile pelvic floor anastomat injection mold, and relates to the technical field of injection molds, the threaded hole forming structure comprises a base, a first connecting plate is arranged on the top surface of the base, a second connecting plate is arranged on the side, away from the base, of the first connecting plate, and a third connecting plate is arranged on the side, away from the first connecting plate, of the second connecting plate; a fourth connecting plate used for achieving counter-acting force supporting is arranged on the side, away from the second connecting plate, of the third connecting plate, a lower mold used for supporting the mold is arranged on the side, away from the third connecting plate, of the fourth connecting plate, and an upper mold capable of being separated from and closed with the lower mold is arranged on the side, away from the fourth connecting plate, of the lower mold. A top plate is arranged on the top face of the upper mold, one side of the upper mold is rotationally connected with a clamping plate used for achieving closing of the lower mold and the upper mold, and an injection molding mechanism used for injection molding of the mold is arranged in the forming structure. The rejection rate is reduced.

Description

Technical Field

[0001] This application relates to the field of injection mold technology, and in particular to a threaded hole forming structure for an injection mold of a disposable sterile pelvic floor anastomosis device for medical use. Background Technology

[0002] Currently, in the field of medical device manufacturing, threaded hole forming technology is a key link to ensure the functionality, safety and reliability of the device. Traditional injection mold threaded hole forming technology mainly relies on inclined ejector pins for forced demolding. However, as medical devices develop towards miniaturization, high precision and sterilization, the limitations of traditional technology are gradually being exposed.

[0003] When dealing with small threads (such as the thread of a puncture needle sleeve with a diameter of less than 2mm), the angled ejector method is prone to stress concentration, which can lead to thread deformation or breakage. It also wears quickly and has a limited mold life. In addition, the forced ejection technique is only suitable for soft plastics (such as TPE). For hard engineering plastics (such as PPSU and PEI), the excessive ejection force may damage the thread profile. Utility Model Content

[0004] To improve the problem of thread deformation or breakage during demolding, this application provides a thread hole forming structure for an injection mold of a disposable sterile pelvic floor anastomosis device.

[0005] The threaded hole forming structure of the injection mold for a disposable sterile pelvic floor anastomosis device provided in this application adopts the following technical solution:

[0006] A threaded hole forming structure for an injection mold of a disposable sterile pelvic floor anastomosis device includes a base, a connecting plate 1 on the top surface of the base, a connecting plate 2 on the side of the connecting plate 1 away from the base, a connecting plate 3 on the side of the connecting plate 2 away from the connecting plate 1, a connecting plate 4 on the side of the connecting plate 3 away from the connecting plate 2 for providing reaction force support, a lower mold for supporting the mold on the side of the connecting plate 4 away from the connecting plate 3, an upper mold that can be separated from and closed with the lower mold on the side of the lower mold away from the connecting plate 4, a top plate on the top surface of the upper mold, a snap-fit ​​plate for closing the lower mold and the upper mold rotatably connected to one side of the upper mold, and a snap-fit ​​block that snaps into and matches the snap-fit ​​plate fixedly connected to one side of the lower mold.

[0007] The molding structure is internally equipped with an injection mechanism for injection molds.

[0008] By adopting the above technical solution, the base, connecting plate one, connecting plate two, connecting plate three, connecting plate four, lower mold, upper mold and top plate are designed with multi-layer connecting plates to disperse the injection pressure and prevent mold deformation. The snap-fit ​​plate and snap-fit ​​block realize repeated positioning to ensure tight connection between the lower mold and the upper mold. The injection mechanism is used to realize the injection mold.

[0009] Preferably, the injection molding mechanism includes an injection port, which is fixedly connected to the inside of the top plate. The lower mold has an outer shell inside. The inside of the upper mold is fixedly connected to and communicates with the injection port. The bottom surface of the injection port is fixedly connected to and communicates with an injection flow pipe that is fixedly connected to and communicates with the lower mold.

[0010] By adopting the above technical solution, the injection port is tapered to reduce shear heat (preventing degradation of high-temperature medical materials such as PEEK), and the injection flow tube is used to pour the injection fluid in the injection port into the mold cavity.

[0011] Preferably, a handle that is fixedly connected to the outer shell is provided between the lower mold and the upper mold during injection molding. The handle is provided with a demolding mechanism for achieving thread demolding. The upper mold is provided with several cooling pipes.

[0012] By adopting the above technical solution, the demolding mechanism is used to demold the injection mold by rotating the screw thread, and the cooling pipe is used to cool the injection molded part, so that it can solidify and accelerate its molding speed.

[0013] Preferably, the demolding mechanism includes a slide rail, which is fixedly connected to and communicates with a connecting plate, and an electric push rod is fixedly connected to the side of the slide rail away from the connecting plate.

[0014] By adopting the above technical solution, the slide provides the basis for the movement of the rack, and the electric actuator serves as the driving source. Its output end is fixed to the rack, providing kinetic energy for the movement of the rack.

[0015] Preferably, the output end of the electric actuator is slidably connected inside the slide rail, and the output end of the electric actuator is fixedly connected to a rack that is slidably connected between the connecting plate and the slide rail.

[0016] By adopting the above technical solution, the rack meshes with gear one, providing power for the rotation of gear one.

[0017] Preferably, the inner wall of the connecting plate one is rotatably connected to a gear one that meshes with the rack, and the top surface of the gear one is fixedly connected to a gear two that is rotatably connected to the connecting plate two.

[0018] By adopting the above technical solution, gear one and gear two are fixedly connected, and the rotation of gear one provides power for the rotation of gear two.

[0019] Preferably, the connecting plate two is rotatably connected to a gear three that meshes with gear two, and a rotating column is fixedly connected inside the gear three.

[0020] By adopting the above technical solution, gear two meshes with gear three, and the rotation of gear two provides power for the rotation of gear three, thereby driving the rotating column to rotate.

[0021] Preferably, the inner side of the connecting plate four is fixedly connected to a protective sleeve fitted on the outer surface of the rotating column, and the end of the rotating column away from the gear three is fixedly connected to a threaded column that meshes with the handle.

[0022] By adopting the above technical solution, the protective sleeve prevents molten plastic from seeping into the gap between the connecting plate and the rotating column during injection molding, thus avoiding jamming failure. At the same time, it is easy to clean and meets the sterility requirements. The threaded column is used to achieve thread demolding and ensure the sealing of the medical thread.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] The horizontal movement of the rack is controlled by the extension and retraction of the electric actuator, which drives the rotation of gear one, gear two, and gear three. This, in turn, drives the threaded core to rotate, which in turn controls the upward movement of the injection mold through its thread, thereby achieving demolding. Compared with demolding with a slanted ejector, the threaded core exits along a spiral trajectory, which can eliminate lateral forces and avoid deformation or breakage of the thread, thus reducing the scrap rate. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this application;

[0026] Figure 2 This is a schematic diagram of the overall structure of this application from another angle;

[0027] Figure 3 This is a schematic diagram of the connection structure of the injection molding tube in this application;

[0028] Figure 4 This is a schematic diagram of the gear-connection structure in this application;

[0029] Figure 5 For this application Figure 4 Enlarged schematic diagram of the structure at point A in the middle;

[0030] Figure 6 For this application Figure 4 Enlarged schematic diagram of the structure at point B.

[0031] Attached reference numerals: 1. Base; 2. Connecting plate one; 3. Connecting plate two; 4. Connecting plate three; 5. Connecting plate four; 6. Lower mold; 7. Upper mold; 8. Top plate;

[0032] 91. Injection port; 92. Injection flow tube; 93. Handle; 94. Cooling pipe; 95. Housing;

[0033] 1001. Slide rail; 1002. Electric actuator; 1003. Rack; 1004. Gear 1; 1005. Gear 2; 1006. Gear 3; 1007. Rotating column; 1008. Protective sleeve; 1009. Threaded column;

[0034] 11. Snap-on board; 12. Snap-on block. Detailed Implementation

[0035] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0036] This application discloses a threaded hole forming structure for an injection mold of a disposable sterile pelvic floor anastomosis device.

[0037] Reference Figure 1 , Figure 2 A threaded hole forming structure for an injection mold of a disposable sterile pelvic floor anastomosis device includes a base 1. A control button is provided on the side of the base 1. A connecting plate 2 is fixedly connected to the top surface of the base 1. A sliding groove is formed inside the connecting plate 2. One side of the connecting plate 2 is fixedly connected to a connecting plate 3, which is located away from the base 1, and the connecting plates 2 and 3 are interconnected. One side of the connecting plate 3 is fixedly connected to a connecting plate 4, which is located away from the connecting plate 2, and the connecting plates 3 and 4 are interconnected. One side of the connecting plate 4 is fixedly connected to a connecting plate 5, which is located away from the connecting plate 3, and the connecting plates 4 and 5 are interconnected. One side of the upper mold 6 is fixedly connected to the lower mold 6. The lower mold 6 is located on the side away from the connecting plate 4. The connecting plate 5 is connected to the lower mold 6. The upper mold 7 is snapped onto one side of the lower mold 6. The lower mold 6 and the upper mold 7 can be separated and closed. Mold grooves are opened inside the lower mold 6 and the upper mold 7, and a sealed model cavity is formed when the lower mold 6 and the upper mold 7 are closed. The side of the upper mold 7 away from the lower mold 6 is fixedly connected to the top plate 8. A lifting mechanism can be installed on the top surface of the top plate 8. One side of the upper mold 7 is rotatably connected to the snap-fit ​​plate 11. The snap-fit ​​plate 11 is used to realize the closure of the lower mold 6 and the upper mold 7. The side of the lower mold 6 near the snap-fit ​​plate 11 is fixedly connected to the snap-fit ​​block 12. The snap-fit ​​plate 11 and the snap-fit ​​block 12 are snapped and matched.

[0038] During use, the injection molding machine's power system drives the upper mold 7 to move towards the lower mold 6 until it is fully closed, so that the lower mold 6 and the upper mold 7 form a mold cavity when they are closed. Then, by rotating the locking plate 11, the locking plate 11 is engaged with the locking block 12, thereby ensuring that the lower mold 6 and the upper mold 7 are closed to each other.

[0039] Reference Figure 2 , Figure 3 The molding structure has an internal injection molding mechanism, which includes an injection port 91. The injection port 91 is conical to reduce the melt shear rate and heat accumulation, thereby preventing thermal degradation of high-temperature medical materials such as PEEK. The injection port 91 is fixed and interconnected inside the upper mold 7 and the top plate 8. The lower mold 6 has a mold groove inside, and a shell 95 is placed in the mold groove. One part of the shell 95 is located inside the mold groove between the lower mold 6 and the upper mold 7. The bottom end of the injection port 91 is fixedly connected to the injection flow tube 92. The injection flow tube 92 is fixedly connected inside the lower mold 6 and is interconnected with the mold slots opened in the lower mold 6. Through the injection port 91 and the injection flow tube 92, the handle 93 is formed by injection molding into the mold slots opened in the lower mold 6 and the upper mold 7. The upper mold 7 is provided with several cooling tubes 94. The cooling tubes 94 can be made of copper with a thermal conductivity of 386W / (m·K). Compared with stainless steel (16W / (m·K)), the heat exchange efficiency is increased by 24 times, which significantly shortens the molding cycle and improves production efficiency.

[0040] In use, the outer shell 95 is placed in the mold groove opened in the lower mold 6. Medical-grade plastic particles (such as PP, PC, COC) are heated to a molten state (180-300℃). The heated and molten medical-grade plastic particles in the injection port 91 are injected into the sealed cavity of the mold groove opened in the lower mold 6 and the upper mold 7 through the injection port 91 and injection flow pipe 92 at high pressure and high speed via the screw or plunger of the injection molding machine. The molten plastic quickly fills the entire cavity, replicating the shape of the cavity and the core. Subsequently, the cooling water circulating inside the cooling pipe 94 starts to work, carrying away the heat of the molten plastic. Under the constraint of the cavity and the core, the plastic gradually cools, solidifies and sets.

[0041] Reference Figures 4 to 6The handle 93 has a demolding mechanism inside, which includes a slide rail 1001. The slide rail 1001 is fixedly connected to one side of the connecting plate 2 and is interconnected with the connecting plate 2. One side of the slide rail 1001 is fixedly connected to the fixed end of the electric push rod 1002. The fixed end of the electric push rod 1002 is located on the side away from the connecting plate 2. The output end of the electric push rod 1002 is slidably connected inside the slide rail 1001 and is fixed. A rack 1003 is connected and slidably connected to the inside of the connecting plate 1 2 and the slide rail 1001. The inside of the connecting plate 1 2 is rotatably connected to the gear 1 1004. The gear 1 1004 meshes with the rack 1003. The top surface of the gear 1 1004 is fixed with the gear 2 1005. The gear 2 1005 is rotatably connected to the inside of the connecting plate 2 3. The inside of the connecting plate 2 3 is rotatably connected to the gear 3 1006. The gear 3 1006 meshes with the gear 2 1005.

[0042] During use, after cooling is complete, rotate the snap-fit ​​plate 11 so that the snap-fit ​​plate 11 is not snapped with the snap-fit ​​block 12. Then, the upper mold 7 moves upward until it is completely separated from the lower mold 6. Then, the electric push rod 1002 extends to drive the rack 1003 to move. The movement of the rack 1003 drives the gear 1004, which is meshed with the rack 1003, to rotate. The rotation of the gear 1004 drives the gear 2 1005, which is fixedly connected to the gear 1004, to rotate.

[0043] Gear 3 1006 is fixedly connected to the rotating column 1007. The inner wall of connecting plate 4 5 is fixedly connected to the protective sleeve 1008. The protective sleeve 1008 is fitted on the outer surface of the rotating column 1007. The protective sleeve 1008 can be made of PTFE material to prevent molten plastic from seeping into the gap between connecting plate 2 3 and rotating column 1007 during injection molding. One end of the rotating column 1007 is fixedly connected to the threaded column 1009. The threaded column 1009 is located on the side away from gear 3 1006. The threaded column 1009 can be precision machined by CNC to ensure the sealing of the medical thread. The surface of the threaded column 1009 can be coated with a diamond-like carbon film to reduce wear on the thread during demolding. In the initial state, the threaded column 1009 is located inside the mold groove opened by the lower mold 6 and the upper mold 7.

[0044] In use, the rotation of gear 2 1005 drives the rotation of gear 3 1006, which meshes with gear 2 1005. The rotation of gear 3 1006 drives the rotation of rotating column 1007, which is fixedly connected to gear 3 1006. The rotation of rotating column 1007 drives the rotation of threaded column 1009, which is fixedly connected to rotating column 1007. In the initial state, threaded column 1009 is located inside the mold groove opened by the lower mold 6 and the upper mold 7. The handle 93 formed by injection molding will wrap around threaded column 1009 and mesh with threaded column 1009. As threaded column 1009 rotates, it will control handle 93 to move upward to achieve thread demolding in the helical direction, effectively reducing the risk of thread deformation and breakage, and is suitable for micro high-precision injection molding needs.

[0045] In this injection molding machine, the power system drives the upper mold 7 of the mold to move, and the control button controls the extension and retraction of the electric push rod 1002. This is existing technology and will not be described in detail here. The electric push rod 1002 is a Thomson Electrak. By pressing the extension button on the control button, the motor rotates forward and the extension rod extends. By pressing the retraction button on the control panel, the motor rotates in reverse and the extension rod retracts. The thrust is adjusted according to the control signal to perform precise linear motion.

[0046] The implementation principle of the threaded hole forming structure of the injection mold for a disposable sterile pelvic floor anastomosis device in this application embodiment is as follows:

[0047] In use, the outer shell 95 is placed in the mold groove opened in the lower mold 6, and the threaded post 1009 is located inside the mold groove opened in the lower mold 6. Then, the power system of the injection molding machine drives the upper mold 7 to move towards the lower mold 6, so that the lower mold 6 and the upper mold 7 close to form a mold cavity. Then, by rotating the snap-fit ​​plate 11, the snap-fit ​​plate 11 and the snap-fit ​​block 12 are snapped together, thereby ensuring that the lower mold 6 and the upper mold 7 are closed to each other. Next, the medical-grade plastic particles in the injection port 91 are injected into the mold cavity opened in the mold groove of the lower mold 6 and the upper mold 7 through the injection port 91 and the injection flow pipe 92 by the screw or plunger of the injection molding machine. Then, the cooling water in the cooling pipe 94 starts to work, carrying away the heat of the molten plastic. The plastic gradually cools, solidifies and shapes under the constraint of the cavity and the core.

[0048] After cooling, rotate the snap-fit ​​plate 11 to disengage it from the snap-fit ​​block 12. Then, the upper mold 7 moves upward until it is completely separated from the lower mold 6. Subsequently, the electric push rod 1002 extends to drive the rack 1003 to move. The movement of the rack 1003 drives the gear 1004, which is meshed with the rack 1003, to rotate. The rotation of the gear 1004 drives the gear 2 1005, gear 3 1006, rotating column 1007, and threaded column 1009 to rotate together. Through the rotation of the threaded column 1009, the control handle 93 moves upward, thereby completing the demolding.

[0049] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A threaded hole forming structure for an injection mold of a disposable sterile pelvic floor anastomosis device, characterized in that: Includes a base (1), the top surface of which is provided with a connecting plate one (2), a connecting plate two (3) is provided on the side of the connecting plate one (2) away from the base (1), a connecting plate three (4) is provided on the side of the connecting plate two (3) away from the connecting plate one (2), a connecting plate four (5) is provided on the side of the connecting plate three (4) away from the connecting plate two (3) for providing reaction force support, and a connecting plate four (5) is provided on the side of the connecting plate four (5) away from the connecting plate three (4) for providing reaction force support. The lower mold (6) supports the mold. An upper mold (7) is provided on the side of the lower mold (6) away from the connecting plate (5), which can be separated from and closed with the lower mold (6). A top plate (8) is provided on the top surface of the upper mold (7). A snap-fit ​​plate (11) for closing the lower mold (6) and the upper mold (7) is rotatably connected to one side of the upper mold (7). A snap-fit ​​block (12) that snaps and matches the snap-fit ​​plate (11) is fixedly connected to one side of the lower mold (6). The molding structure is internally equipped with an injection mechanism for injection molds.

2. The threaded hole forming structure of the injection mold for a disposable sterile pelvic floor anastomosis device according to claim 1, characterized in that: The injection molding mechanism includes an injection port (91), which is fixedly connected to the inside of the top plate (8). The lower mold (6) is provided with a shell (95). The inside of the upper mold (7) is fixedly connected to and communicates with the injection port (91). The bottom surface of the injection port (91) is fixedly connected to and communicates with an injection flow pipe (92) which is fixedly connected to and communicates with the lower mold (6).

3. The threaded hole forming structure of the injection mold for a disposable sterile pelvic floor anastomosis device according to claim 2, characterized in that: A handle (93) is fixedly connected to the outer shell (95) between the lower mold (6) and the upper mold (7). The handle (93) is provided with a demolding mechanism for thread demolding. The upper mold (7) is provided with several cooling pipes (94).

4. The threaded hole forming structure of the injection mold for a disposable sterile pelvic floor anastomosis device according to claim 3, characterized in that: The demolding mechanism includes a slide (1001), which is fixedly connected to and communicates with the connecting plate (2). An electric push rod (1002) is fixedly connected to the side of the slide (1001) away from the connecting plate (2).

5. The threaded hole forming structure of the injection mold for a disposable sterile pelvic floor anastomosis device according to claim 4, characterized in that: The output end of the electric actuator (1002) is slidably connected inside the slide rail (1001), and the output end of the electric actuator (1002) is fixedly connected to a rack (1003) that is slidably connected between the connecting plate (2) and the slide rail (1001).

6. The threaded hole forming structure of the injection mold for a disposable sterile pelvic floor anastomosis device according to claim 5, characterized in that: The inner wall of the connecting plate 1 (2) is rotatably connected to a gear 1 (1004) that meshes with the rack (1003), and the top surface of the gear 1 (1004) is fixedly connected to a gear 2 (1005) that is rotatably connected to the connecting plate 2 (3).

7. The threaded hole forming structure of the injection mold for a disposable sterile pelvic floor anastomosis device according to claim 6, characterized in that: The connecting plate 2 (3) is rotatably connected to a gear 3 (1006) that meshes with gear 2 (1005), and a rotating column (1007) is fixedly connected inside the gear 3 (1006).

8. The threaded hole forming structure of the injection mold for a disposable sterile pelvic floor anastomosis device according to claim 1, characterized in that: The connecting plate four (5) is internally fixedly connected to a protective sleeve (1008) sleeved on the outer surface of the rotating column (1007), and the end of the rotating column (1007) away from the gear three (1006) is fixedly connected to a threaded column (1009) that meshes with the handle (93).

Images