A multi-cavity injection molding device for integrally forming a drip chamber and tubing of an infusion set

Abstract

The application provides a multi-cavity injection molding equipment for integrally forming a drip chamber and a pipeline of an infusion device, and relates to the technical field of injection molding equipment. A first hydraulic cylinder is used to drive a moving seat to complete high-precision mold closing. Inside the mold after mold closing, a second hydraulic cylinder and a third hydraulic cylinder drive a core into position in parallel: a second core passes through a hot melt cavity to accurately block the entrance of a second cavity in a conical surface sealing manner, thereby dividing the injection molding space into independent drip chamber forming cavities and pipeline forming cavities. Subsequently, two independent feeders synchronously inject polyethylene and polyvinyl chloride melts. After injection molding is completed, the equipment sequentially performs cooling, core removal, and local hot melting. A hot melter performs secondary heating and fusion on the junction area of the drip chamber and the pipeline in the mold, thereby forming an integrated product with high strength and high sealing performance. All actions are coordinated by a control box through pre-programmed logic and closed-loop control in combination with pressure sensors, travel sensors, and temperature sensors, thereby ensuring independent injection molding and reliable fusion.

Description

[0001] This invention relates to the field of injection molding equipment technology, specifically to a multi-cavity injection molding equipment for the integrated molding of an infusion set drip chamber and tubing. Background Technology

[0002] In the existing technology, the infusion set drip chamber and tubing are usually manufactured separately, that is, the drip chamber and tubing are formed by independent injection molds, and then connected by adhesive bonding, hot melting or mechanical assembly.

[0003] The aforementioned patent documents and prior art have the following technical problems when used: Problem 1: The assembly process after modular molding is complex and prone to human error, resulting in insufficient sealing at the joints and increasing the risk of leakage or contamination. This is especially true in the field of medical devices, where the requirements for sterility and durability are extremely high. Any tiny gap may lead to bacterial growth or structural failure. Question 2: The secondary assembly of the dripping bucket and pipeline increases production steps and costs, prolongs the manufacturing cycle, and reduces overall efficiency; Question 3: Traditional injection molding equipment is mostly single-cavity or simple multi-cavity design, which cannot simultaneously process the injection of melts of different materials. This can easily cause material mixing, poor compatibility, or thermal degradation, resulting in reduced product transparency, poor scratch resistance, and even non-compliance with medical regulations. Summary of the Invention

[0004] Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a multi-cavity injection molding device for the integrated molding of infusion set drip chambers and tubing, solving the following problems: 1. Traditional modular assembly is complex and prone to human error, leading to poor sealing at joints. In the field of medical devices, where sterility and durability are extremely important, this increases the risk of leakage or contamination, and may cause bacterial growth or structural failure due to tiny gaps. 2. The secondary assembly of traditional dripping buckets and pipelines increases production steps and costs, prolongs the manufacturing cycle, and reduces overall efficiency; 3. Traditional injection molding equipment cannot simultaneously process melts of different materials. This can easily lead to material mixing, poor compatibility, or thermal degradation, resulting in reduced product transparency, poor scratch resistance, and even non-compliance with medical regulations.

[0005] Technical solution To achieve the above objectives, the present invention provides the following technical solution: a multi-cavity injection molding device for integrated molding of an infusion set drip chamber and tubing, comprising a body, a fixed base located at the center of the top of the body, and both ends of the fixed base having horizontally provided first injection ports; a first mold located on one side of the fixed base, and a second mold located on the side of the first mold away from the fixed base; both the first and second molds having mounting grooves on their surfaces, and both mounting grooves containing heat melters; both heat melters having wires on their top surfaces; a first cavity located on one side of the mounting grooves on the surfaces of the first and second molds, and a second cavity located on the other side of the mounting grooves; the surface of the first mold having a first... The surfaces of both the cavity and the second cavity are provided with second injection ports, and the positions of the first injection ports correspond one-to-one with the positions of the second injection ports. The two sides of the fixed base are provided with mounting brackets that cross each other. One side of the mounting bracket is provided with a control box, and the other side of the mounting bracket is provided with a second hydraulic cylinder. The top of the first mold is provided with a guide cylinder, and the bottom of the first mold is provided with a third hydraulic cylinder. The inside of the guide cylinder is provided with a second guide rod. One side of the first mold is provided with a first pressure plate, and the other side of the first mold is provided with a second pressure plate. The side of the first pressure plate is provided with a first core, one end of the first core is provided with a second core, and the side of the second pressure plate is provided with a third core.

[0006] Preferably, the guide cylinder and the third hydraulic cylinder are mirror images of the first mold. The third hydraulic cylinder is bolted to the fixed seat, and the fixed seat is welded to the guide cylinder. The third hydraulic cylinder is bolted to the bottom end of the second pressure plate, and one end of the second guide rod is bolted to the top end of the second pressure plate. The first pressure plate is bolted to the second hydraulic cylinder. The first core is located in the middle of the first pressure plate, and the third core is located in the middle of the second pressure plate. The second core at one end of the first core is cylindrical. The positions of the first core and the second core correspond one-to-one with the positions of the first cavity and the third core corresponds one-to-one with the positions of the second cavity. The heat melters inside the two mounting slots are bolted to the first mold and the second mold.

[0007] Preferably, the machine body has an electrical cabinet inside, and a hydraulic pump is provided on one side of the electrical cabinet. The hydraulic pump is installed inside the machine body and is bolted to the machine body.

[0008] Preferably, two feeders are horizontally arranged on the side of the fixed base away from the first mold, and one end of each feeder is connected to two first injection ports on the surface of the fixed base. A storage tank is provided on the top of the end of each feeder away from the fixed base, and a heater is provided on the outside of the other end of each feeder. The storage tank is bolted to the feeder, and the heater is sleeved with the feeder.

[0009] Preferably, the second mold is provided with a movable seat on the side away from the first mold, and the movable seat is provided with a tail seat on the side away from the second mold. The first mold is bolted to the fixed seat, and the second mold is bolted to the movable seat. The positions of the two second injection ports on the surface of the first mold correspond one-to-one with the positions of the two first injection ports on the surface of the fixed seat.

[0010] Preferably, each corner of the fixed seat, the movable seat, and the tail seat is provided with a guide hole, and each guide hole is provided with a first guide rod. One end of the four first guide rods is bolted to the fixed seat. The guide holes on the surfaces of the fixed seat, the movable seat, and the tail seat are positioned in a one-to-one correspondence, and the other end of the first guide rod is connected to the tail seat nut. A first hydraulic cylinder is provided at the middle position of the surface of the tail seat away from the movable seat, and the first hydraulic cylinder is bolted to the tail seat.

[0011] Preferably, the top of each of the two surfaces of the body near the tailstock is provided with a sliding groove, and the two sliding grooves are mirror images of the body. The top of the tailstock is provided with a shell, and the inside of the shell is provided with a side door. The shell and the side door are both n-shaped. The shell is bolted to the two surfaces of the body. Both ends of the side door are provided with sliders. The sliders are integrally formed with the side door, and both sliders are installed in the sliding grooves.

[0012] Preferably, the first hydraulic cylinder and the second hydraulic cylinder are both connected to the hydraulic pump pipeline, and the first hydraulic cylinder, the second hydraulic cylinder, the third hydraulic cylinder, the control box, the feeder, the heat melter, and the heater are all electrically connected to the control box and the electrical cabinet.

[0013] Preferably, the method of using the multi-cavity injection molding equipment for integrated molding of infusion set drip chamber and tubing includes the following steps: Sp1, Mold Closure and Cavity Fixing: The first hydraulic cylinder is activated via the control box to move the second mold, causing it to fit against the first mold on the fixed base, forming the first cavity and the second cavity. Two hot melters located in the mounting groove at the junction of the two cavities form a hot melt cavity communicating with the first cavity. Sp2, Core Insertion and Cavity Division: The second hydraulic cylinder is activated by the control box to drive the first pressure plate, so that the first core and the second core on the first pressure plate are installed into the first cavity; at the same time, the second core passes through the hot melt cavity and blocks the second cavity, dividing the injection space into a closed first molding cavity, namely the drip cavity and the hot melt cavity, and a closed second molding cavity, namely the pipeline cavity. Sp3, Third core insertion: The third hydraulic cylinder is activated by the control box to drive the second pressure plate, so that the third core on the second pressure plate is installed into the second cavity and inserted into the interior of the second core; Sp4, Raw material plasticization: The two feeders and heaters are started by the control box to heat and plasticize the polyethylene particles and polyvinyl chloride particles in the storage tank into melt, and then convey them to the second injection port through the first injection port; Sp5, Simultaneous Injection Molding: Through the second injection port, the polyethylene melt is injected into the first molding cavity to form a drip chamber, while the polyvinyl chloride melt is injected into the second molding cavity to form a pipeline; Sp6, Cooling and Curing: Maintain pressure and cool the mold to allow the dripping bucket and tubing to cool and cure within the mold cavity; Sp7, First Core Removal and Pipeline Positioning: The second hydraulic cylinder is activated by the control box to drive the first pressure plate to retract, so that the first core and the second core are removed from the first cavity, and the pipeline positioning formed inside the second core remains inside the dripping bucket; Sp8, Hot Melt Integrated Molding: Two hot melters are activated by the control box for secondary heating, and the junction area between the dripping bucket and the internal pipeline in the hot melt cavity is partially fused to achieve integrated molding of the dripping bucket and the pipeline; Sp9, Mold Opening and Part Removal: After stopping heating and cooling the welding area, the second mold is pushed apart from the first mold by the first hydraulic cylinder to remove the formed dripping bucket-pipeline integrated assembly.

[0014] Beneficial effects This invention provides a multi-cavity injection molding device for the integrated molding of an infusion set drip chamber and tubing. It offers the following advantages: 1. In this design, the drip chamber and tubing are not separately injection molded and then manually assembled. Instead, they are formed in one step within the same mold through multi-cavity synchronous injection molding, avoiding gaps caused by secondary insertion or bonding. After molding, the hot-melt cavity in the mold connects to the drip chamber cavity during mold closing. A secondary localized heating of the connection area is achieved through a hot-melt device, allowing the molecular chains of the drip chamber and tubing ports to re-fuse, thus forming a continuous, high-strength, seamless interface. This method not only achieves true integration but also avoids the existence of micro-gaps, eliminating the risk of bacterial growth and leakage, and ensuring the high sterility and durability required for medical devices. Furthermore, a high-precision conical fit is used between the second core and the second cavity inlet, forming a metal-to-metal seal line during mold closing, ensuring no material leakage under high injection pressure and further improving the sealing effect of the interface area.

[0015] 2. This solution directly produces the finished product through multi-cavity synchronous injection molding, eliminating the need for traditional manual assembly and significantly reducing processes and labor costs. Combined with centralized scheduling and sensor-based closed-loop control of hydraulic cylinders, core insertion / removal devices, independent feeders, and temperature-controlled heaters, the entire process achieves a high degree of automation. The production cycle is shortened by approximately 20% to 30% compared to traditional processes, while also significantly reducing labor costs, tooling and fixture costs, and secondary aseptic processing expenses.

[0016] 3. This design incorporates an independent cavity and a separate core structure, completely isolating the drip chamber from the pipeline chamber. This ensures that the polyethylene and PVC melts do not interfere with each other during injection, avoiding poor compatibility and reduced transparency during the flow process. Two independent feeding systems and heaters precisely control the temperature within their respective optimal temperature zones, with real-time feedback from temperature sensors to prevent thermal degradation of the melt. Simultaneously, a small amount of bifunctional compatibilizer is introduced into the polyethylene to enhance the physical interaction between the polyethylene and PVC at the interface, thereby improving the bonding strength and overall transparency. Attached Figure Description

[0017] Figure 1 This is an isometric view of the injection molding equipment of the present invention; Figure 2 This is a front view of the injection molding equipment of the present invention; Figure 3 For the present invention Figure 2 Sectional view at point AA; Figure 4 For the present invention Figure 2 Sectional view at BB; Figure 5 This is a partial isometric view of the present invention; Figure 6 This is a partial right view of the present invention; Figure 7 For the present invention Figure 6 Sectional view at CC; Figure 8 This is a front view of the template of the present invention; Figure 9 This is an isometric drawing of the part of the present invention; Figure 10 This is a process flow diagram of the present invention.

[0018] The components are as follows: 1. Machine body; 2. Electrical cabinet; 3. Feeder; 4. Storage hopper; 5. Fixed base; 6. Control box; 7. Outer shell; 8. Side door; 9. Heater; 10. First injection port; 11. Slider; 12. Slide groove; 13. Tailstock; 14. Moving base; 15. First hydraulic cylinder; 16. First guide rod; 17. Guide hole; 18. Mounting bracket; 19. Second hydraulic cylinder; 20. Third hydraulic cylinder; 21. Guide cylinder; 22. First pressure plate; 23. Second pressure plate; 24. Second guide rod; 25. First core; 26. Second core; 27. Third core; 28. First mold; 29. ​​Second mold; 30. First cavity; 31. Second cavity; 32. Second injection port; 33. Mounting groove; 34. Hot melt machine; 35. Wire; 36. Hydraulic pump. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Specific Implementation Example 1: like Figures 1 to 10 As shown, this invention proposes a multi-cavity injection molding device for the integrated molding of infusion set drip chamber and tubing, the structure and operation of which are as follows: During the operation of the entire injection molding equipment, the first hydraulic cylinder 15 is activated by issuing a command through the control box 6. This hydraulic cylinder is installed in the middle of the side surface of the tailstock 13 away from the moving seat 14 and is firmly connected to the tailstock 13 by bolts. Its working principle is that the hydraulic oil supplied by the hydraulic pump 36 pushes the piston rod to extend or retract in the cylinder, thereby generating linear thrust. One end of the piston rod of the first hydraulic cylinder 15 is connected to the moving seat 14. When the piston rod extends, it pushes the moving seat 14 to move smoothly along the four first guide rods 16 at a predetermined speed and pressure. These first guide rods 16 pass through guide holes 17 at various corners of the fixed seat 5, the moving seat 14, and the tailstock 13. The guide holes 17 are used to accommodate the first guide rods 16. One end is bolted to the fixed seat 5, and the other end is connected to the nut of the tailstock 13. Their working principle is to provide precise linear guidance to ensure that the moving seat 14 does not deviate or tilt during movement, achieving high-precision alignment. To enhance safety, the first hydraulic cylinder 15 integrates a pressure sensor, which is electrically connected to the control box 6. When the pressure exceeds a preset threshold, an alarm is automatically triggered and operation is paused to prevent mold collision or overload damage. A second mold 29 is bolted to the movable seat 14. When the movable seat 14 is pushed, the second mold 29 precisely approaches the first mold 28 on the fixed seat 5. The first mold 28 is fixed to the fixed seat 5 by bolts, and finally, the second mold 29 and the first mold 28 fit tightly together, completing the mold closing operation. At this time, the first cavity 30 on the surface of the first mold 28 and the second cavity 31 on the surface of the second mold 29 mate to form a complete sealed injection space. The first cavity 30 is used to form the shape of the dripping funnel, and its internal shape is designed as the cavity structure of the dripping funnel. The second cavity 31 is used to form the shape of the pipeline, and its internal part is a tubular channel. Simultaneously, two hot melters 34 are installed in the mounting grooves 33 on the surfaces of the first mold 28 and the second mold 29, respectively. These hot melters 34 are connected to the molds by bolts, and wires 35 are connected to the top for power supply. Their working principle is to generate heat through electric heating elements to heat and melt localized areas. When the two molds are fitted together, the two mounting grooves 33 align to form a closed hot melt cavity. This hot melt cavity is directly connected to the first cavity 30, but temporarily separated from the second cavity 31 for subsequent welding operations. The formation of the hot melt cavity ensures that after mold closing, the connection with the first cavity 30 allows melt flow, but separation is achieved through the subsequent core insertion. To optimize hot melt efficiency, the hot melters 34 can use ceramic heating elements, supporting rapid heating and precise temperature control, typically within a temperature range of 180-250°C. This is suitable for melting and fusing medical-grade plastics such as polyethylene and polyvinyl chloride, avoiding material degradation or contamination. A small amount of polymer with dual functional groups, i.e., a compatibilizer, is added to the polyethylene. This compatibilizer is compatible with polyethylene on one end and interacts with polyvinyl chloride through physical action on the other end, thereby increasing compatibility.

[0021] Next, the control box 6 activates the second hydraulic cylinder 19, which is mounted on the surface of the mounting bracket 18 and connected to the first pressure plate 22 by bolts. Its working principle also relies on the hydraulic oil supplied by the hydraulic pump 36 to push the piston rod out, thereby moving the first pressure plate 22 forward. A first core 25 is installed at the middle of the side of the first pressure plate 22. A cylindrical second core 26 is provided on one side of the first core 25. The positions of the first core 25 and the second core 26 correspond one-to-one with the positions of the first cavity 30. When the first pressure plate 22 moves, the first core 25 and the second core 26 are simultaneously and precisely inserted into the first cavity 30. The working principle of the first core 25 is to serve as an internal support and forming part for the shape of the dripping funnel, restricting the flow of melt to form the inner cavity shape of the dripping funnel. The second core 26, as a cylindrical extension, passes through the hot melt cavity and its end precisely blocks the entrance of the second cavity 31, thereby dividing the originally connected injection space into two independent closed cavities: one is the dripping funnel forming cavity formed by the first cavity 30 and the hot melt cavity, and the other is the pipeline forming cavity formed by the second cavity 31. To ensure sealing, the contact surface between the second core 26 and the mold, that is, the docking point with the second cavity 31, is designed as a precise conical surface. During mold clamping and core placement, extremely high fitting precision is used to form a metal-to-metal seal line, ensuring no gaps under injection pressure. This separation ensures independent injection of melts of different materials, preventing mixing. To improve core durability, the first core 25, second core 26, and third core 27 can be made of high-hardness stainless steel, and the second core 26 is mirror-polished to reduce surface roughness to an extremely low level. Simultaneously, chrome plating further reduces friction and facilitates demolding. At the same time, the control box 6 synchronously activates the third hydraulic cylinder 20. This hydraulic cylinder is horizontally mounted at the bottom of the first mold 28 and bolted to the fixed base 5. Its piston rod is bolted to the bottom end of the second pressure plate 23. The working principle of the third hydraulic cylinder 20 is to push the piston rod horizontally outward through hydraulic oil, thereby moving the second pressure plate 23 horizontally. A third core 27 is installed at the middle of the side of the second pressure plate 23, and its position corresponds one-to-one with the second cavity 31. When the second pressure plate 23 moves, the third core 27 is precisely inserted into the second cavity 31, and one end is inserted into and abuts against the inside of the second core 26. Since the inner diameter of the second core 26 matches that of the third core 27, the working principle of the third core 27 is to act as a forming part of the inner diameter of the pipe, restricting the melt to form a precise tubular structure in the second cavity 31. At the same time, the cooperation with the second core 26 ensures the precise alignment of the pipe end and the connection of the dripping bucket. The guide cylinder 21 at the top of the first mold 28 is welded to the fixed base 5. The second guide rod 24 is provided inside, and one end is bolted to the top of the second pressure plate 23. The working principle of the guide cylinder 21 and the second guide rod 24 is to provide lateral linear guidance, prevent the second pressure plate 23 from shifting during movement, and ensure the accuracy of the insertion of the third core 27.All hydraulic cylinders are connected to hydraulic pump 36 via pipelines. Hydraulic pump 36 is installed inside the machine body 1 and connected to the machine body 1 by bolts. Its working principle is that the pump body is driven by an electric motor to generate high-pressure hydraulic oil, which is supplied to each hydraulic cylinder to achieve precise torque and speed control. Electrical cabinet 2 is installed inside the machine body 1, adjacent to hydraulic pump 36 on one side, providing power distribution and circuit protection, and is electrically connected to control box 6. Control box 6 is installed on the surface of mounting bracket 18 on the other side and is used to issue commands to coordinate all components. To prevent hydraulic oil leakage, the pipeline connection is designed with a sealing ring and integrates an oil level sensor connected to control box 6 to achieve real-time monitoring.

[0022] After all the cores are in place, the control box 6 immediately starts the two feeders 3. These feeders 3 are horizontally installed on the side of the fixed base 5 away from the first mold 28. One end of each feeder 3 is connected to the two first injection ports 10 on the surface of the fixed base 5, and the other end has a storage tank 4 on top, which is bolted together. The feeders 3, storage tank 4, and heater 9 together form the injection molding device of the injection molding machine. The working principle of the storage tank 4 is to store two raw materials, polyethylene granules and polyvinyl chloride granules, to provide continuous feeding. The storage tank 4 is fixed to the top of the feeder 3 with bolts, and its outlet is precisely connected to the inlet of the feeder 3 to ensure that the granular raw materials continuously and stably enter the material cylinder of the feeder 3. The volume design of the storage tank 4 meets the needs of long-term production and reduces downtime due to frequent feeding. The capacity is usually 50-100L, and a drying device can be added to prevent the granules from absorbing moisture. The feeder 3 works by using an internal screw to meter and convey granules from the storage bin 4. The screw is driven by a motor at the end of the feeder 3, and the motor speed is adjusted by the control box 6 to match the screw's conveying capacity. Simultaneously, an external heater 9 is attached, generating heat through heating coils to transfer heat to the inside of the feeder 3, ensuring the granules are uniformly plasticized into a melt under the shearing force and heat of the screw. The heater 9 is fitted onto the outer wall of the barrel, forming a heat conduction system with the feeder 3 body. The temperature control of the heater 9 complements the shearing action of the screw, ensuring rapid and uniform melting of the granules. Typical plasticizing temperatures are 160-200°C for polyethylene and 150-180°C for polyvinyl chloride. The control box 6 coordinates the operation of the feeder 3, heater 9, and motor, while the electrical cabinet 2 provides stable power support, ensuring that the feeder 3's start-up, stopping, and speed adjustment during the injection molding cycle are synchronized with the entire equipment. Polyethylene granules are plasticized into polyethylene melt and conveyed through a first injection port 10 to a corresponding second injection port 32. The second injection port 32 is located on one side of the first cavity 30 on the surface of the first mold 28, corresponding one-to-one with the position of the first injection port 10. Polyvinyl chloride granules are plasticized into polyvinyl chloride melt and conveyed through another first injection port 10 to a corresponding second injection port 32 of the second cavity 31. During the injection molding process, the polyethylene melt is injected at high speed and high pressure through the second injection port 32 into the drip forming cavity, i.e., the first cavity 30 and the hot melt cavity, flowing evenly and filling the space. Under the constraint of the first core 25 and the second core 26, the outer shape and internal structure of the drip funnel are formed. The polyvinyl chloride melt is injected through another second injection port 32 into the pipeline forming cavity, i.e., the second cavity 31, flowing along the annular space inside the third core 27 and the second core 26, filling the cavity, and forming the precise inner and outer diameters of the pipeline. The entire injection process is carried out simultaneously, ensuring that the two melts are formed independently in their respective cavities. Through multi-cavity synchronous injection molding, the drip chamber and infusion pipeline are integrated into one piece, reducing secondary assembly and improving sealing and production efficiency.After injection molding, the pressure is maintained and the mold is cooled by a mold cooling system. The mold cooling system in this application adopts an existing mature mold cooling system. The existing mold cooling system is a temperature control device for injection molds. It mainly uses cooling channels designed inside the first mold 28 and the second mold 29 to absorb and remove heat from the mold by circulating cooling medium, thereby solidifying the injected melt. The cooling time is usually 10-30 seconds and supports EtO or gamma ray sterilization. Subsequently, the control box 6 activates the second hydraulic cylinder 19 to drive the first pressure plate 22 to retract, and the first core 25 and the second core 26 are smoothly extracted from the first cavity 30. At this time, the tube part formed inside the second core 26 remains inside the dripping bucket because it is connected to the dripping bucket, achieving precise positioning of the tube. Next, control box 6 activates two hot melters 34, which are powered by wires 35 to heat the area where the dripping chamber and the pipeline meet inside the hot melt cavity, performing secondary local melting. The working principle of the hot melter 34 is that the electric heating element generates high temperature, so that the plastic reaches the melting temperature and fuses to form an integrated structure. After melting, the component is scratch-resistant, highly transparent, and complies with medical regulations by being free of plasticizers. After the melting and cooling solidification, control box 6 activates the second hydraulic cylinder, which causes the second hydraulic cylinder 19 to move the second pressure plate 23 laterally, so that the third core 27 on the second pressure plate 23 is pulled out from the formed pipeline and exits the second cavity 31. The first hydraulic cylinder 15 retracts its piston rod, pulling the moving seat 14 to separate from the second mold 29, opening the mold and removing the product. The top of both sides of the main body 1 near the tailstock 13 are provided with slide grooves 12. The top of the tailstock 13 is provided with an n-shaped outer shell 7, which is connected to the main body 1 by bolts. Inside the outer shell 7 is an n-shaped side-opening door 8, with sliders 11 integrally formed at both ends and installed in the slide grooves 12. The side-opening door 8 works by sliding the sliders 11 in the slide grooves 12 to open and close, which is convenient for maintenance and observation. All electrical components of the entire equipment are electrically connected to the control box 6 and the electrical cabinet 2 to ensure coordinated operation. For easy cleaning, the outer shell 7 and the side-opening door 8 are made of stainless steel and support regular disinfection.

[0023] The entire multi-cavity injection molding equipment uses a central controller to perform closed-loop monitoring of sensors at key locations, ensuring safe and accurate operation. Pressure sensors are directly integrated inside the first hydraulic cylinder 15 to monitor the clamping thrust in real time, preventing system overload or mold damage. Stroke sensors, used for position feedback, are installed on the piston rods of the three hydraulic cylinders (first hydraulic cylinder 15, second hydraulic cylinder 19, and third hydraulic cylinder 20). They accurately monitor the clamping position of the moving seat 14 on the first guide rod 16, as well as the insertion and withdrawal endpoints of the core on the first pressure plate 22 and the second pressure plate 23, ensuring the alignment accuracy between the core and the cavity. A hydraulic oil level sensor is integrated inside the oil tank where the hydraulic pump 36 is located, monitoring the hydraulic oil capacity, while a hydraulic oil temperature sensor is installed on the main hydraulic pipeline to ensure stable system operating temperature. A raw material level sensor is installed at the low point inside the storage tank 4 to monitor the amount of raw material particles, preventing the feeder 3 from idling. A melt state temperature sensor is installed close to the outer wall of the feeder 3's cylinder, providing accurate feedback on the plasticizing temperature of polyethylene and polyvinyl chloride raw materials. The temperature sensor of the hot melter 34 is embedded in the mold body near the mounting groove 33 on the surface of the first mold 28 and the second mold 29. It controls the local heating temperature of the hot melter 34 to ensure the quality of secondary melting at the connection between the dripping bucket and the pipeline. In addition, a voltage sensor is installed inside the electrical cabinet 2 to monitor the power supply quality of the external power source in real time, ensuring stable power input for the entire system. All these sensors are electrically connected to the control box 6 via electrical wiring, converting physical parameters into digital signals. They act as the nerve endings for the controller to execute pre-programmed logic, achieve precise timing, and provide safety protection. Furthermore, the pressure sensor is used not only for mold locking but also for closed-loop control of the holding pressure; the hot melter temperature sensor must feed back to the control box 6 for precise control of the hot melt time and power. Specific Implementation Example 2: like Figures 1 to 10 As shown, based on the content of the above specific embodiments, the following content is further disclosed: The control flow of control box 6 is as follows: Control box 6 acts as the central controller, coordinating all components through pre-programmed logic and sensor feedback. The process is a combination of sequential execution and parallel branches: Initialization: Power-on self-test, checking the status of hydraulic pump 36, electrical cabinet 2, and all hydraulic cylinders and motors, including oil temperature, voltage, and sensor calibration; Mold closing command: Sending a signal to start the first hydraulic cylinder 15 to extend, pushing the moving seat 14 to close the mold, monitoring pressure sensor feedback to ensure fit, and automatically adjusting the speed if the standard is not met; Core insertion branch: The second hydraulic cylinder 19 and the third hydraulic cylinder 20 are started in parallel. The second hydraulic cylinder 19 drives the first pressure plate 22 to insert the first core 25 and the second core 26, and the third hydraulic cylinder 20 drives the second pressure plate 23 to insert the third core 27; Plasticizing command: Starting the feeder 3 motor and heating... Unit 9: Temperature sensor monitors melt state; metering screw delivers to injection port, simultaneously checking material level to prevent dry running; Injection command: High-pressure injection of melt, pressure and time control for holding pressure, injection volume precisely metered by flow sensor; Cooling delay: Activates cooling system, timed solidification, and monitors mold temperature profile; Core removal command: Activates second hydraulic cylinder 19 to retract, extracting first core 25 and second core 26, positioning pipeline, using vibration to assist demolding and reduce adhesion; Hot melt command: Activates hot melt heater 34 for heating, temperature sensor controls melting time to ensure fusion strength meets standards; Mold opening command: Activates first hydraulic cylinder 15 to retract, opening mold and removing product, activating automatic ejection mechanism to assist product removal; Cycle reset: Resets all components, preparing for the next cycle, recording production data for quality traceability. If an abnormality occurs, control box 6 interrupts the process. Control flow ensures component coordination: force guidance coordination between hydraulic cylinder and guide rod, thermal coordination between feeder 3 and heater 9, shape constraints between core and cavity, and local fusion of hot melter 34 and cavity. All of these are synchronized and error-free through electrical and piping connections in control box 6, and support remote monitoring interface for integration with factory MES system. Specific Implementation Example 3: like Figures 1 to 10 As shown, based on the content of the above specific embodiments, the following content is further disclosed: The overall structure of the equipment uses the main body 1 as the basic supporting frame, inside which an electrical cabinet 2 is installed. A hydraulic pump 36 is installed adjacent to one side of the electrical cabinet 2, and the hydraulic pump 36 is firmly connected to the inside of the main body 1 by bolts, ensuring stable power supply and transmission for the hydraulic system. A fixed base 5 is fixedly installed at the top center of the main body 1. The fixed base 5 serves as a core positioning component, with two first injection ports 10 horizontally symmetrically arranged on its two ends for melt conveying channels. A first mold 28 is directly installed on one side of the fixed base 5 and fixed to it by bolts. A second mold 29 is correspondingly installed on the side of the first mold 28 away from the fixed base 5, and the second mold 29 is connected to a movable base 14 by bolts. A tailstock 13 is installed on the side of the movable base 14 away from the second mold 29, thus forming a linear arrangement structure from the fixed base 5 to the tailstock 13. Both the first mold 28 and the second mold 29 have mounting grooves 33 on their surfaces. Each mounting groove 33 houses a hot melt machine 34, which is bolted to the first mold 28 and the second mold 29 respectively. A wire 35 is connected to the top surface of the hot melt machine 34 for power transmission. One side of the mounting groove 33 has a first cavity 30 on the surface of the first mold 28 and the second mold 29, and the other side has a second cavity 31. The surfaces of the first cavity 30 and the second cavity 31 each have second injection ports 32, which are aligned one-to-one with the first injection ports 10 on the surface of the fixing base 5 to ensure precise melt injection. The positions of the two second injection ports 32 on the surface of the first mold 28 are further precisely matched with the two first injection ports 10 on the fixing base 5. Mounting brackets 18 are cross-mounted on both sides of the fixing base 5. One mounting bracket 18 has a control box 6 mounted on its surface, and the other mounting bracket 18 has a second hydraulic cylinder 19 mounted on its surface. These mounting brackets 18 provide lateral support. A guide cylinder 21 is welded to the top of the first mold 28, and a third hydraulic cylinder 20 is bolted to the bottom. The third hydraulic cylinder 20 is also bolted to the fixed base 5. The guide cylinder 21 and the third hydraulic cylinder 20 are arranged in a mirror-symmetrical manner with the first mold 28 as the center. A second guide rod 24 is inserted inside the guide cylinder 21. One end of the second guide rod 24 is bolted to the top of the second pressure plate 23. The second pressure plate 23 is located on one side of the first mold 28, and its bottom end is bolted to the third hydraulic cylinder 20. A third core 27 is installed in the middle of the side of the second pressure plate 23, and the position of the third core 27 corresponds one-to-one with the second cavity 31. A first pressure plate 22 is installed on the other side of the first mold 28. The first pressure plate 22 is bolted to the second hydraulic cylinder 19. A first core 25 is installed in the middle of the side of the first pressure plate 22. A cylindrical second core 26 is installed on one side of the first core 25, and the positions of the first core 25 and the second core 26 correspond one-to-one with the first cavity 30.Two feeders 3 are horizontally mounted on the side of the fixed base 5 away from the first mold 28. One end of each feeder 3 is directly connected to two first injection ports 10 on the surface of the fixed base 5. A storage tank 4 is bolted to the top of the end of the feeder 3 away from the fixed base 5. A heater 9 is sleeved on the other end of the feeder 3, forming a raw material supply chain. Guide holes 17 are provided at each corner of the fixed base 5, the movable base 14, and the tailstock 13. Four first guide rods 16 are installed through the guide holes 17. One end of each first guide rod 16 is bolted to the fixed base 5, and the other end is connected to the tailstock 13 with a nut. The positions of these guide holes 17 on the surfaces of the three bases correspond one-to-one to ensure linear guidance. A first hydraulic cylinder 15 is bolted to the middle of the surface of the tailstock 13 away from the movable base 14 to provide the power for opening and closing the mold. Two sliding grooves 12 are mirror-imagely arranged on the top of the two side surfaces of the machine body 1 near the tailstock 13. An n-shaped outer shell 7 is installed on the top of the tailstock 13. The outer shell 7 is connected to the two side surfaces of the machine body 1 by bolts. An n-shaped side door 8 is provided inside the outer shell 7. The two ends of the side door 8 are integrally formed with sliders 11, which are embedded in the sliding grooves 12 to achieve sliding opening and closing. The first hydraulic cylinder 15 and the second hydraulic cylinder 19 are both connected to the hydraulic pump 36 through pipes to provide hydraulic power. The first hydraulic cylinder 15, the second hydraulic cylinder 19, the third hydraulic cylinder 20, the control box 6, the feeder 3, the heat melter 34, and the heater 9 are all electrically connected to the control box 6 and the electrical cabinet 2 to form a unified control network.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a reference structure" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-cavity injection molding device for integrated molding of infusion set drip chamber and tubing, comprising a body (1), characterized in that: The top of the body (1) is provided with a fixed seat (5) at the middle position, and the two ends of the fixed seat (5) are provided with first injection ports (10) horizontally. The fixed seat (5) is provided with a first mold (28) on one side, and a second mold (29) is provided on the side of the first mold (28) away from the fixed seat (5). The surfaces of the first mold (28) and the second mold (29) are provided with mounting grooves (33), and the interiors of the two mounting grooves (33) are provided with hot melters (34). The top surfaces of the two hot melters (34) are provided with wires (35). The mounting grooves (33) on the surfaces of the first mold (28) and the second mold (29) are provided with a first cavity (30) on one side, and a second cavity (31) on the other side. The surfaces of the first cavity (30) and the second cavity (31) on the surface of the first mold (28) are provided with second injection ports (32), and the positions of the first injection ports (10) and the second injection ports (32) are one-to-one. Correspondingly, mounting brackets (18) are provided on both sides of the fixed base (5). A control box (6) is provided on the surface of one mounting bracket (18), and a second hydraulic cylinder (19) is provided on the surface of the mounting bracket (18) on the other side. A guide cylinder (21) is provided on the top of the first mold (28), and a third hydraulic cylinder (20) is provided on the bottom of the first mold (28). A second guide rod (24) is provided inside the guide cylinder (21). A first pressure plate (22) is provided on one side of the first mold (28), and a second pressure plate (23) is provided on the other side of the first mold (28). A first core (25) is provided on the side of the first pressure plate (22). A second core (26) is provided on one side of the first core (25), and a third core (27) is provided on the side of the second pressure plate (23). When the second pressure plate (23) moves, the third core (27) is inserted into the second cavity (31), and one end is inserted into and abuts against the inside of the second core (26). The guide cylinder (21) and the third hydraulic cylinder (20) are mirror images of the first mold (28). The third hydraulic cylinder (20) is bolted to the fixed seat (5), and the fixed seat (5) is welded to the guide cylinder (21). The third hydraulic cylinder (20) is bolted to the bottom end of the second pressure plate (23), and one end of the second guide rod (24) is bolted to the top end of the second pressure plate (23). The first pressure plate (22) is bolted to the second hydraulic cylinder (19). The first core (25) is set on the first pressure plate (22). The third core (27) is located in the middle of the second pressure plate (23), and the second core (26) at one end of the first core (25) is cylindrical. The positions of the first core (25) and the second core (26) correspond one-to-one with the positions of the first cavity (30), and the positions of the third core (27) correspond one-to-one with the positions of the second cavity (31). The hot melters (34) inside the two mounting slots (33) are bolted to the first mold (28) and the second mold (29).

2. The multi-cavity injection molding equipment for integrated molding of infusion set drip chamber and tubing according to claim 1, characterized in that: The machine body (1) is equipped with an electrical cabinet (2) inside, and a hydraulic pump (36) is provided on one side of the electrical cabinet (2). The hydraulic pump (36) is installed inside the machine body (1) and is bolted to the machine body (1).

3. The multi-cavity injection molding equipment for integrated molding of infusion set drip chamber and tubing according to claim 1, characterized in that: Two feeders (3) are horizontally arranged on the side of the fixed base (5) away from the first mold (28), and one end of each feeder (3) is connected to the two first injection ports (10) on the surface of the fixed base (5). The top of the two feeders (3) away from the fixed base (5) is provided with a storage tank (4), and the other end of each feeder (3) is provided with a heater (9). The storage tank (4) is bolted to the feeder (3), and the heater (9) is sleeved with the feeder (3).

4. A multi-cavity injection molding device for integrated molding of infusion set drip chamber and tubing according to claim 1, characterized in that: The second mold (29) is provided with a movable seat (14) on the side away from the first mold (28), and the movable seat (14) is provided with a tail seat (13) on the side away from the second mold (29). The first mold (28) is bolted to the fixed seat (5), and the second mold (29) is bolted to the movable seat (14). The positions of the two second injection ports (32) on the surface of the first mold (28) correspond one-to-one with the positions of the two first injection ports (10) on the surface of the fixed seat (5).

5. A multi-cavity injection molding device for integrated molding of infusion set drip chamber and tubing according to claim 1, characterized in that: Each corner of the fixed seat (5), the movable seat (14) and the tail seat (13) is provided with a guide hole (17), and the inside of the guide hole (17) is provided with a first guide rod (16). One end of the four first guide rods (16) is bolted to the fixed seat (5). The positions of the guide holes (17) on the surfaces of the fixed seat (5), the movable seat (14) and the tail seat (13) are in one-to-one correspondence. The other end of the first guide rod (16) is connected to the nut of the tail seat (13). A first hydraulic cylinder (15) is provided at the middle position of the surface of the tail seat (13) away from the movable seat (14), and the first hydraulic cylinder (15) is bolted to the tail seat (13).

6. A multi-cavity injection molding device for integrated molding of infusion set drip chamber and tubing according to claim 1, characterized in that: The top of both sides of the body (1) near the tailstock (13) are provided with slide grooves (12), and the two slide grooves (12) are mirror images of the body (1). The top of the tailstock (13) is provided with a shell (7), and the inside of the shell (7) is provided with a side door (8). The shell (7) and the side door (8) are both n-shaped. The shell (7) is bolted to both sides of the body (1). Both ends of the side door (8) are provided with sliders (11). The sliders (11) are integrally formed with the side door (8). Both sliders (11) are installed in the slide grooves (12).

7. A multi-cavity injection molding device for integrated molding of infusion set drip chamber and tubing according to claim 5, characterized in that: The first hydraulic cylinder (15) and the second hydraulic cylinder (19) are both connected to the hydraulic pump (36) pipeline. The first hydraulic cylinder (15), the second hydraulic cylinder (19), the third hydraulic cylinder (20), the control box (6), the feeder (3), the heat melter (34), and the heater (9) are all electrically connected to the control box (6) and the electrical cabinet (2).

8. A method of using a multi-cavity injection molding device for integrated molding of an infusion set drip chamber and tubing, based on any one of claims 1-7, comprising the following steps: Sp1, Mold Closure and Cavity Fixing: The first hydraulic cylinder (15) is activated by the control box (6) to push the second mold (29) to move, so that the second mold (29) fits with the first mold (28) on the fixed seat (5) to form the first cavity (30) and the second cavity (31). The two hot melters (34) in the mounting groove (33) located at the junction of the two cavities form a hot melt cavity that communicates with the first cavity. Sp2, Core insertion and cavity division: The second hydraulic cylinder (19) is activated by the control box (6) to drive the first pressure plate (22), so that the first core (25) and the second core (26) on the first pressure plate (22) are installed into the first cavity (30); at the same time, the second core (26) passes through the hot melt cavity and blocks the second cavity (31), dividing the injection space into a closed first molding cavity, namely the drip cavity and the hot melt cavity, and a closed second molding cavity, namely the pipeline cavity; Sp3, Third core insertion: The third hydraulic cylinder (20) is started by the control box (6) to drive the second pressure plate (23), so that the third core (27) on the second pressure plate (23) is installed into the second cavity (31) and inserted into the interior of the second core (26); Sp4, Raw material plasticization: The two feeders (3) and heater (9) are started by the control box (6) to heat and plasticize the polyethylene particles and polyvinyl chloride particles in the storage tank (4) into melts, and then convey them to the second injection port (32) through the first injection port (10). Sp5, Synchronous injection molding: Through the second injection port (32), the polyethylene melt is injected into the first molding cavity to form a dripping bucket, and at the same time, the polyvinyl chloride melt is injected into the second molding cavity to form a pipeline; Sp6, Cooling and Curing: Maintain pressure and cool the mold to allow the dripping bucket and tubing to cool and cure within the mold cavity; Sp7, First core removal and pipeline positioning: The second hydraulic cylinder (19) is activated by the control box (6) to drive the first pressure plate (22) to retract, so that the first core (25) and the second core (26) exit the first cavity (30), and the pipeline positioning formed inside the second core (26) remains inside the dripping bucket; Sp8, Hot melt integrated molding: The two hot melters (34) are started by the control box (6) to perform secondary heating, and the dripping bucket and the internal pipeline are partially fused in the junction area of ​​the hot melt cavity, so that the dripping bucket and the pipeline can be integrated into one piece; Sp9, Mold opening and part removal: After stopping heating and cooling the welding area, the second mold (29) is pushed apart from the first mold (28) by the first hydraulic cylinder (15) to remove the formed dripping bucket-pipeline integrated assembly.

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