An injection molding apparatus for a pipette tip

Abstract

The application relates to the technical field of pipette tip injection molding, in particular to a pipette tip injection molding device, which comprises a base, two side plates symmetrically arranged at the top of the base, an injection mechanism, a cutting mechanism and a cooling mechanism. The injection mechanism comprises an upper mold, a lower mold, a lifting assembly, a plurality of mold cores, a plurality of mold cavities and a plurality of injection ports. The cutting mechanism comprises a cutting knife, a connecting assembly, a telescopic assembly, a driving assembly, two moving plates, two cutting grooves and two cutting seats. The cooling mechanism comprises a refrigeration cylinder, an extrusion assembly, a conveying assembly, a plurality of refrigeration fins and a plurality of nozzles. The cutting knife and the cutting grooves on the cutting seats can cut off the corner materials of the end part of the finished pipette tip on the mold core, that is, the injection and the corner material cutting can be completed simultaneously in one-time processing, and the cutting does not need additional tools or manual operation, which is beneficial to improving the processing efficiency of the pipette tip and the quality of the finished product.

Description

Technical Field

[0001] This invention relates to the field of pipette tip injection molding technology, specifically a pipette tip injection molding apparatus. Background Technology

[0002] Pipette tips are disposable or reusable components mounted on pipettes for drawing and releasing liquids. Pipette tips are generally manufactured using injection molding.

[0003] Existing pipette tip injection molding devices have the following shortcomings: 1. After injection molding, scrap material will appear at the end of the finished pipette tip due to the presence of the injection port. Existing injection molding equipment cannot quickly remove the scrap material at the end of the pipette after molding. Additional tools or manual removal are required, resulting in low processing efficiency of pipette tips. 2. After injection molding is completed, the pipette tip on the mold core cannot be cooled in time, which is not conducive to the unloading of the pipette tip; To address the aforementioned issues, a pipette tip injection molding device is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a pipette tip injection molding apparatus to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A pipette tip injection molding device includes a base, two side plates symmetrically arranged on both sides of the top of the base, and also includes an injection molding mechanism, a cutting mechanism and a cooling mechanism. The injection molding mechanism includes an upper mold, a lower mold, a lifting assembly, multiple mold cores, multiple mold cavities, and multiple injection ports. The upper mold is fixedly installed on the top of the two side plates, the lower mold is located below the upper mold, multiple mold cores are equidistantly installed on the top of the lower mold, multiple mold cavities are equidistantly opened on one side of the upper mold, and each injection port is installed on the top of the upper mold. The lifting assembly is located between the lower mold and the two side plates. The cutting mechanism includes a cutting blade, a connecting assembly, a telescopic assembly, a driving assembly, two moving plates, two cutting slots, and two cutting seats. The cutting blade is slidably disposed between the two side plates. Both moving plates are located on one side of the cutting blade. Each moving plate is slidably disposed on one side of a side plate. Each cutting seat is fixed to the side of a moving plate near the cutting blade. Each cutting slot is formed on the surface of a cutting seat. The connecting assembly is located between the two moving plates. The cooling mechanism includes a cooling cylinder, an extrusion assembly, a conveying assembly, multiple cooling plates, and several nozzles. The cooling cylinder is located above the base, and the nozzles are installed on one side of multiple die cores. The cooling plates are installed inside the cooling cylinder.

[0006] As a further embodiment of the present invention: the lifting assembly includes a horizontal plate, a cylinder and a connecting plate. The horizontal plate is fixedly installed on one side of the two side plates, the cylinder is installed on the top of the horizontal plate, the connecting plate is fixed to one side of the lower mold, and the output end of the cylinder is fixedly connected to the horizontal plate.

[0007] As a further embodiment of the present invention: the drive assembly includes a mounting base, a bidirectional electric actuator, two racks, two guide rails, and two gears. The mounting base is fixedly mounted on one side of one of the side plates. The bidirectional electric actuator is mounted on the top of the mounting base. The two guide rails are symmetrically arranged on both sides of the bidirectional electric actuator and are both fixed on the mounting base. Each rack is slidably disposed inside one of the guide rails. The two ends of the bidirectional electric actuator are respectively fixedly connected to the two racks. Each gear is located above one rack, and each gear meshes with one rack.

[0008] As a further embodiment of the present invention: the telescopic assembly includes two swing rods, two slots, two insert rods, two strip grooves and two moving rods. The two strip grooves are symmetrically opened on the surface of the side plate. Each moving rod is slidably disposed inside a strip groove. One end of the two moving rods is respectively connected to the cutting blade and one of the moving plates, and the other end of the two moving rods is respectively fixedly connected to the two insert rods. Two fixing plates are symmetrically fixed at the top of the mounting base. Each gear is rotatably mounted on a fixing plate via a rotating shaft. One end of each rocker arm is fixedly connected to the rotating shaft on a gear. Each slot is opened at the end of a rocker arm away from the gear, and each insert rod is inserted into the inside of a slot.

[0009] As a further aspect of the present invention: the connecting assembly includes a socket and an electric push rod, the socket being opened at one end of one of the movable plates, the electric push rod being installed inside the other movable plate, and the inner diameter of the socket matching the outer diameter of the output end of the electric push rod.

[0010] As a further embodiment of the present invention: a support plate is fixed on the side of the two side plates away from the cylinder, and the refrigeration cylinder is fixedly installed on the top of the support plate.

[0011] As a further embodiment of the present invention: the extrusion assembly includes a pull rope, a guide wheel, a pull rod, a piston plate and a plurality of second springs. The piston plate is slidably disposed inside the refrigeration cylinder. One end of the pull rod is fixedly connected to the piston plate, and the other end of the pull rod passes through the refrigeration cylinder and is connected to one end of the pull rope. The guide wheel is rotatably disposed at the top of the support plate, and the other end of the pull rope passes around the guide wheel and is fixedly connected to the cutting blade. Multiple second springs are located at the end of the piston plate away from the pull rod. Each second spring is connected to the cooling cylinder and the piston plate at both ends respectively. The end of the cooling cylinder away from the pull rope has a through hole, and the end of the cooling cylinder near the pull rope has an air inlet pipe installed on its surface.

[0012] As a further aspect of the present invention: the delivery assembly includes an air outlet pipe and multiple connecting pipes. The air outlet pipe is located below the air inlet pipe. One end of the air outlet pipe is connected to the cooling cylinder, and the other end of the air outlet pipe is connected to multiple nozzles through multiple connecting pipes.

[0013] As a further aspect of the present invention: vertical grooves are provided on the surfaces of both side plates, and a movable block is slidably provided inside each vertical groove. Each movable block is fixedly connected to the lower mold. A fixed block is fixed on the side of each side plate that is far apart from each other. A sliding rod is slidably provided on each movable block. The top end of each sliding rod is fixedly connected to the fixed block. A first spring is sleeved on the outside of each sliding rod. The two ends of each first spring are respectively connected to the fixed block and the movable block. The bottom of the upper mold is fixed with multiple guide rods, and the top of the lower mold is provided with multiple guide grooves that cooperate with the guide rods.

[0014] As a further aspect of the present invention: each cutting seat has multiple clearance grooves on the side away from the moving plate, and each clearance groove is located above the cutting groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention provides a pipette tip injection molding device. By setting a cutting mechanism, after injection molding is completed and the mold core is moved out of the mold cavity, the driving component and the telescopic component can drive the cutting blade and two cutting seats to move. The cutting blade and the cutting groove on the cutting seat can remove the scrap material at the end of the finished pipette tip on the mold core. That is, injection molding and scrap material removal can be completed simultaneously in one processing, without the need for additional tools or manual removal, which is beneficial to improving the processing efficiency and finished product quality of pipette tips.

[0016] 2. The pipette tip injection molding device of the present invention, while the cutting blade moves to remove the scrap material, uses the extrusion component to spray cold air inside the cooling cylinder through several nozzles to the surface of the finished pipette tip, thereby cooling the freshly injection molded pipette tip to facilitate subsequent demolding and use.

[0017] 3. In the pipette tip injection molding apparatus of the present invention, during the process of the cutting blade moving towards the pipette tip, the nozzle can cool down the pipette tip, so that the freshly injection molded pipette tip can be cooled and solidified, making the pipette tip harder. That is, when cutting the scrap material, the scrap material has been cooled and solidified, avoiding the problem of cutting deformation caused by the soft texture of the freshly injection molded pipette tip, which is beneficial to improving the quality of the finished pipette tip.

[0018] 4. The pipette tip injection molding device of the present invention, by setting an extrusion component, enables the cutting blade to cool the pipette tip while moving, forming a linkage effect between the two, with high synchronization, meeting the usage requirements, and at the same time reducing the number of drive sources used, reducing power consumption and cost.

[0019] 5. The present invention provides a pipette tip injection molding device, which, through a lifting component, allows the lower mold and multiple mold cores on the lower mold to move upward, and allows the mold cores to enter the interior of the mold cavity. Molding liquid is injected into the gap between the mold cavity and the mold core through the injection port, thereby realizing the processing of the pipette tip. By setting multiple mold cores and mold cavities, multiple pipette tips can be processed at one time, enabling batch processing and improving the injection molding efficiency of pipette tips. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0021] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0022] Figure 3 For the present invention Figure 2 An enlarged structural diagram of part A in the middle.

[0023] Figure 4 This is a cross-sectional view of the present invention.

[0024] Figure 5 This is a side view of the present invention.

[0025] Figure 6 This is a schematic diagram of the cross-sectional structure of the present invention.

[0026] Figure 7 This is a schematic diagram of the cross-sectional structure of the refrigeration cylinder in this invention.

[0027] Figure 8 This is a schematic diagram of the structure of the movable plate in this invention.

[0028] Figure 9 For the present invention Figure 8 A magnified structural diagram of part B.

[0029] The components are as follows: 11. Base; 12. Side plate; 13. Upper mold; 14. Mold cavity; 15. Injection port; 16. Mold core; 17. Horizontal plate; 18. Cylinder; 19. Connecting plate; 20. Fixing block; 21. Slide rod; 22. Moving block; 23. First spring; 24. Position sensor; 25. Guide rod; 26. Guide groove; 27. Strip groove; 28. Moving rod; 29. ​​Cutting blade; 30. Moving plate; 31. Cutting seat; 32. Cutting groove; 33. Clearance groove; 34. Insertion hole; 35. Electric actuator; 36. Mounting base; 37. Bidirectional electric actuator; 38. Rack; 39. Guide rail; 40. Gear; 41. Swing rod; 42. Slot; 43. Insert rod; 44. Pull rope; 45. Guide wheel; 46. Pull rod; 47. Piston plate; 48. Refrigeration cylinder; 49. Refrigeration element; 50. Air outlet pipe; 51. Connecting pipe; 52. Nozzle; 53. Air inlet pipe; 54. Through hole; 55. Second spring; 56. Support plate; 57. Lower mold. Detailed Implementation

[0030] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0031] The present invention provides the following preferred embodiments: Example 1, as Figures 1-9 As shown, a pipette tip injection molding device includes a base 11, two side plates 12 symmetrically arranged on both sides of the top of the base 11, and also includes an injection molding mechanism, a cutting mechanism and a cooling mechanism. The injection molding mechanism includes an upper mold 13, a lower mold 57, a lifting assembly, multiple mold cores 16, multiple mold cavities 14, and multiple injection ports 15. The upper mold 13 is fixedly installed on the top of the two side plates 12. The lower mold 57 is located below the upper mold 13. Multiple mold cores 16 are equidistantly installed on the top of the lower mold 57. Multiple mold cavities 14 are equidistantly opened on one side of the upper mold 13. Each injection port 15 is installed on the top of the upper mold 13. Specifically, each injection port 15 is connected to a mold cavity 14. The lifting assembly is located between the lower mold 57 and the two side plates 12. When it is necessary to injection mold the pipette tip, the lifting assembly is used to move the lower mold 57 upward. The lower mold 57 can move multiple mold cores 16 on the lower mold 57. When the multiple mold cores 16 move into the interior of multiple mold cavities 14 respectively, a chamber for processing the pipette tip can be formed between the mold cores 16 and the mold cavities 14. Then, the molten injection liquid is injected into the interior of the chamber formed by the mold cores 16 and the mold cavities 14 through multiple injection ports 15, thus forming the injection molding of the pipette tip. After injection molding is completed, the lower mold 57 is moved downward by the lifting assembly. At this time, the finished pipette tip moves downward with the mold core 16 to facilitate the subsequent demolding and unloading of the pipette tip. The cutting mechanism includes a cutting blade 29, a connecting assembly, a telescopic assembly, a driving assembly, two moving plates 30, two cutting slots 32, and two cutting seats 31. The cutting blade 29 is slidably disposed between the two side plates 12. The two moving plates 30 are both located on one side of the cutting blade 29. Each moving plate 30 is slidably disposed on one side of a side plate 12. Each cutting seat 31 is fixed to the side of a moving plate 30 near the cutting blade 29. Each cutting slot 32 is formed on the surface of a cutting seat 31. The connecting assembly is located between the two moving plates 30. The telescopic assembly is located between the cutting blade 29 and one of the moving plates 30. The driving assembly is located on one side of the telescopic assembly. Specifically, a position sensor 24 is fixed on the surface of one of the side plates 12. The position sensor 24 is electrically connected to the controller. The position sensor 24 is used to detect the position of the lower mold 57. The position sensor 24 is existing technology and will not be described in detail here. When the injection molding is completed and the lower mold 57 moves downward, the position sensor 24 detects the position of the lower mold 57. When the lower mold 57 moves to the set position, the position sensor 24 sends a signal to the controller, and the controller controls the cylinder 18 to stop, thereby stopping the lower mold 57 from moving downward. After injection molding, scrap material will appear at the end of the finished pipette tip due to the presence of the injection port 15. After the lower mold 57 moves to the set position, the telescopic component can be driven by the drive component. The telescopic component can drive the cutting blade 29 and the two moving plates 30 to move towards the pipette tip. The scrap material at the end of the finished pipette tip on the mold core 16 can be removed by using the cutting blade 29 and the cutting groove 32 on the cutting seat 31. That is, injection molding and scrap material removal can be completed simultaneously in one process without the need for additional tools or manual removal, which is beneficial to improving the processing efficiency of the pipette tip and the quality of the finished product. The cooling mechanism includes a cooling cylinder 48, an extrusion assembly, a conveying assembly, multiple cooling plates 49, and several nozzles 52. The cooling cylinder 48 is located above the base 11. The several nozzles 52 are all installed on one side of multiple mold cores 16. The multiple cooling plates 49 are all installed inside the cooling cylinder 48. The conveying assembly is located between the cooling cylinder 48 and the multiple nozzles 52 and is used to convey the gas inside the cooling cylinder 48 to the nozzles 52. The cooling plates 49 are used to cool the gas entering the cooling cylinder 48. When the cutting blade 29 moves toward the pipette tip, the cooled gas inside the cooling cylinder 48 can be extruded through the extrusion assembly and conveyed through the delivery assembly. Multiple nozzles 52 spray the cold gas onto the surface of the finished pipette tip, thereby cooling the freshly injection-molded pipette tip to facilitate subsequent demolding and use. As the cutting blade 29 moves toward the pipette tip, the nozzle 52 cools the pipette tip, allowing the freshly injection-molded pipette tip to be cooled and solidified. This hardens the pipette tip, meaning that when cutting scraps, the scraps have already been cooled and solidified, preventing the freshly injection-molded pipette tip from being too soft and causing deformation during cutting. This helps improve the quality of the finished pipette tip.

[0032] like Figures 1-9 As shown, the lifting assembly includes a horizontal plate 17, a cylinder 18, and a connecting plate 19. The horizontal plate 17 is fixedly installed on one side of the two side plates 12, the cylinder 18 is installed on the top of the horizontal plate 17, and the connecting plate 19 is fixedly installed on one side of the lower mold 57. The output end of the cylinder 18 is fixedly connected to the horizontal plate 17. Specifically, cylinder 18 is electrically connected to controller. When it is necessary to move the lower mold 57, controller controls cylinder 18 to work. Cylinder 18 can drive connecting plate 19 to move, thereby driving the lower mold 57 to rise and fall, so that mold core 16 can move into or out of the mold cavity 14.

[0033] like Figures 1-9 As shown, the drive assembly includes a mounting base 36, a bidirectional electric actuator 37, two racks 38, two guide rails 39, and two gears 40. The mounting base 36 is fixedly mounted on one side of one of the side plates 12. The bidirectional electric actuator 37 is mounted on the top of the mounting base 36. The two guide rails 39 are symmetrically arranged on both sides of the bidirectional electric actuator 37 and are both fixed on the mounting base 36. Each rack 38 is slidably disposed inside one guide rail 39. The two ends of the bidirectional electric actuator 37 are fixedly connected to the two racks 38 respectively. Each gear 40 is located above one rack 38 and meshes with one rack 38.

[0034] like Figures 1-9 As shown, the telescopic assembly includes two swing rods 41, two slots 42, two insert rods 43, two strip grooves 27, and two moving rods 28. The two strip grooves 27 are symmetrically opened on the surface of the side plate 12. Each moving rod 28 is slidably disposed inside a strip groove 27. One end of the two moving rods 28 is connected to the cutting blade 29 and one of the moving plates 30, respectively. The other end of the two moving rods 28 is fixedly connected to the two insert rods 43, respectively. The top of the mounting base 36 is symmetrically fixed with two fixing plates. Each gear 40 is rotatably mounted on a fixing plate via a rotating shaft. One end of each rocker arm 41 is fixedly connected to the rotating shaft on a gear 40. Each slot 42 is opened at the end of a rocker arm 41 away from the gear 40. Each insert rod 43 is inserted into the inside of a slot 42. When it is necessary to cut the scrap material at the tip of the pipette, the two moving plates 30 are first connected by the connecting assembly. Then, the controller controls the bidirectional electric push rod 37 to work. The bidirectional electric push rod 37 can drive the two racks 38 to move away from each other inside the guide rail 39. When the racks 38 move, they can drive the gear 40 to rotate. When the gear 40 rotates, it can drive the swing rod 41 to rotate synchronously. Under the action of the slot 42 and the insert rod 43, when the two racks 38 move away from each other, the two moving rods 28 can move towards each other inside the two strip grooves 27. That is, the cutting blade 29 and the moving plate 30 can move towards each other. The moving plate 30 can drive the cutting seat 31 and the cutting groove 32 on the cutting seat 31 to move. The scrap material at the tip of the finished pipette on the mold core 16 can be cut off by using the cutting blade 29 and the cutting groove 32 on the cutting seat 31.

[0035] like Figures 1-9 As shown, the connecting assembly includes a socket 34 and an electric actuator 35. The socket 34 is opened at one end of one of the movable plates 30, and the electric actuator 35 is installed inside the other movable plate 30. The inner diameter of the socket 34 matches the outer diameter of the output end of the electric actuator 35. When it is necessary to connect the two movable plates 30, the controller controls the electric push rod 35 to work. The output end of the electric push rod 35 can be inserted into the socket 34, so that the two movable plates 30 can be connected. When the moving rod 28 drives one of the movable plates 30 to move, the socket 34 and the electric push rod 35 can be used to drive the other movable plate 30 to move synchronously.

[0036] like Figures 1-9 As shown, a support plate 56 is fixed on the side of the two side plates 12 away from the cylinder 18, and the refrigeration cylinder 48 is fixedly installed on the top of the support plate 56. The support plate 56 can be used to install and fix the refrigeration cylinder 48.

[0037] like Figures 1-9 As shown, the extrusion assembly includes a pull rope 44, a guide wheel 45, a pull rod 46, a piston plate 47, and multiple second springs 55. The piston plate 47 is slidably disposed inside the cooling cylinder 48. One end of the pull rod 46 is fixedly connected to the piston plate 47, and the other end of the pull rod 46 passes through the cooling cylinder 48 and is connected to one end of the pull rope 44. The pull rod 46 is slidably connected to the cooling cylinder 48. The guide wheel 45 is rotatably disposed at the top of the support plate 56. The other end of the pull rope 44 passes around the guide wheel 45 and is fixedly connected to the cutting blade 29. The guide wheel 45 is used to guide the pull rope 44. Multiple second springs 55 are located at the end of the piston plate 47 away from the pull rod 46. Each second spring 55 is connected to the cooling cylinder 48 and the piston plate 47 at both ends respectively. The cooling cylinder 48 is provided with a through hole 54 at the end away from the pull rope 44. An air inlet pipe 53 is installed on the surface of the cooling cylinder 48 near the pull rope 44. In the initial state, the second spring 55 is in its natural state, and the air inside the cooling cylinder 48 is stored. The air inside the cooling cylinder 48 can be cooled by the cooling plate 49.

[0038] like Figures 1-9 As shown, the delivery assembly includes an air outlet pipe 50 and multiple connecting pipes 51. The air outlet pipe 50 is located below the air inlet pipe 53. One end of the air outlet pipe 50 is connected to the cooling cylinder 48, and the other end of the air outlet pipe 50 is connected to multiple nozzles 52 through multiple connecting pipes 51. It should be noted that both the intake pipe 53 and the exhaust pipe 50 are equipped with one-way valves. When the cutting blade 29 moves toward the pipette tip, the cutting blade 29 can drive the pull rod 46 to slide on the cooling cylinder 48 by pulling the pull rope 44. At this time, the pull rod 46 drives the piston plate 47 to move inside the cooling cylinder 48, and the second spring 55 is stretched. When the piston plate 47 moves, it squeezes out the cold air stored inside the cooling cylinder 48 through the air outlet pipe 50. Then, using multiple connecting pipes 51, the cold air can be sprayed out to the surface of the finished pipette tip through several nozzles 52 to cool the pipette tip, so that the pipette tip can harden, which is beneficial for subsequent cutting and demolding, and can effectively prevent the pipette tip from deforming due to its softness during cutting. After the scrap material is cut, the cutting blade 29 moves away from the pipette tip. At this time, under the action of the second spring 55, the piston plate 47 moves away from the pull rod 46. At this time, the outside gas can enter the interior of the cooling cylinder 48 through the air inlet pipe 53. The cooling plate 49 can cool the incoming gas, which is convenient for cooling the next batch of pipette tips.

[0039] like Figures 1-9 As shown, vertical grooves are provided on the surfaces of both side plates 12. A movable block 22 is slidably provided inside each vertical groove. Each movable block 22 is fixedly connected to the lower mold 57. A fixed block 20 is fixed on the side of the two side plates 12 that is far apart from each other. A sliding rod 21 is slidably provided on each movable block 22. The top end of each sliding rod 21 is fixedly connected to the fixed block 20. A first spring 23 is sleeved on the outside of each sliding rod 21. The two ends of each first spring 23 are respectively connected to the fixed block 20 and the movable block 22. The bottom end of the upper mold 13 is fixed with multiple guide rods 25, and the top end of the lower mold 57 is provided with multiple guide grooves 26 that cooperate with the guide rods 25. When the lower mold 57 moves upward, the lower mold 57 drives the moving block 22 to slide inside the vertical groove. The moving block 22 slides on the slide rod 21, and the first spring 23 is compressed. The moving block 22 and the slide rod 21 can guide the lower mold 57.

[0040] like Figures 1-9 As shown, each cutting seat 31 has multiple clearance grooves 33 on the side away from the moving plate 30. Each clearance groove 33 is located above the cutting groove 32. The clearance grooves 33 are designed to avoid scraps from the tip of the pipette.

[0041] The specific working process of this invention is as follows: First, the controller controls the cylinder 18 to work. The cylinder 18 can drive the connecting plate 19 to move. When the connecting plate 19 moves, it can drive the lower mold 57 to move upward. The lower mold 57 can drive the multiple mold cores 16 on the lower mold 57 to move. When the multiple mold cores 16 move into the interior of the multiple mold cavities 14 respectively, a chamber for processing pipette tips can be formed between the mold cores 16 and the mold cavities 14. Then, the molten injection liquid is injected into the interior of the chamber formed by the mold cores 16 and the mold cavities 14 through the multiple injection ports 15, thus forming the injection molding of the pipette tip. After injection molding is completed, the lower mold 57 is moved downward by the lifting assembly. At this time, the finished pipette tip moves downward with the mold core 16 to facilitate the subsequent demolding and unloading of the pipette tip. When the lower mold 57 moves downward, the position sensor 24 detects the position of the lower mold 57. When the lower mold 57 moves to the set position, the position sensor 24 sends a signal to the controller, and the controller controls the cylinder 18 to stop, thereby stopping the lower mold 57 from moving downward. Subsequently, the controller controls the electric push rod 35 to work. The output end of the electric push rod 35 can be inserted into the interior of the insertion hole 34, so that the two moving plates 30 can be connected. The controller controls the bidirectional electric push rod 37 to work. The bidirectional electric push rod 37 can drive the two racks 38 to move away from each other inside the guide rail 39. When the racks 38 move, they can drive the gear 40 to rotate. When the gear 40 rotates, it can drive the swing rod 41 to rotate synchronously. Under the action of the slot 42 and the insertion rod 43, when the two racks 38 move away from each other, the two moving rods 28 can move towards each other inside the two strip grooves 27. That is, the cutting blade 29 and the two moving plates 30 can move towards each other. The moving plate 30 can drive the cutting seat 31 and the cutting groove 32 on the cutting seat 31 to move. The cutting blade 29 and the cutting groove 32 on the cutting seat 31 can be used to remove the scrap material at the end of the finished pipette tip on the mold core 16. Meanwhile, the controller controls the operation of the cooling plate 49. When the cutting blade 29 moves toward the pipette tip, the cutting blade 29 can drive the pull rod 46 to slide on the cooling cylinder 48 by pulling the pull rope 44. At this time, the pull rod 46 drives the piston plate 47 to move inside the cooling cylinder 48, and the second spring 55 is stretched. When the piston plate 47 moves, it squeezes out the cold air stored inside the cooling cylinder 48 through the air outlet pipe 50. Then, using multiple connecting pipes 51, the cold air can be sprayed out through several nozzles 52 to the surface of the finished pipette tip, thereby cooling the pipette tip and making the pipette tip harder. This is beneficial for subsequent cutting and demolding and can effectively prevent the pipette tip from deforming due to its softness during cutting. After the scrap material is cut, the cutting blade 29 moves away from the pipette tip. At this time, under the action of the second spring 55, the piston plate 47 moves away from the pull rod 46. At this time, the outside gas can enter the interior of the cooling cylinder 48 through the air inlet pipe 53. The cooling plate 49 can cool the incoming gas, which is convenient for cooling the next batch of pipette tips.

[0042] The beneficial effects of the present invention are specifically reflected in the fact that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pipette tip injection molding device, comprising a base (11), wherein two side plates (12) are symmetrically arranged on both sides of the top end of the base (11), characterized in that, It also includes injection molding mechanism, cutting mechanism and cooling mechanism; The injection molding mechanism includes an upper mold (13), a lower mold (57), a lifting assembly, multiple mold cores (16), multiple mold cavities (14), and multiple injection ports (15). The upper mold (13) is fixedly installed on the top of the two side plates (12), the lower mold (57) is located below the upper mold (13), multiple mold cores (16) are equidistantly installed on the top of the lower mold (57), multiple mold cavities (14) are equidistantly opened on one side of the upper mold (13), and each injection port (15) is installed on the top of the upper mold (13). The lifting assembly is located between the lower mold (57) and the two side plates (12). The cutting mechanism includes a cutting blade (29), a connecting assembly, a telescopic assembly, a driving assembly, two moving plates (30), two cutting grooves (32), and two cutting seats (31). The cutting blade (29) is slidably disposed between the two side plates (12). The two moving plates (30) are both located on one side of the cutting blade (29). Each moving plate (30) is slidably disposed on one side of a side plate (12). Each cutting seat (31) is fixed on the side of a moving plate (30) close to the cutting blade (29). Each cutting groove (32) is opened on the surface of a cutting seat (31). The connecting assembly is located between the two moving plates (30). The cooling mechanism includes a cooling cylinder (48), an extrusion assembly, a conveying assembly, multiple cooling plates (49) and several nozzles (52). The cooling cylinder (48) is located above the base (11), and the several nozzles (52) are all installed on one side of multiple mold cores (16). The multiple cooling plates (49) are all installed inside the cooling cylinder (48). The lifting assembly includes a horizontal plate (17), a cylinder (18) and a connecting plate (19). The horizontal plate (17) is fixedly installed on one side of the two side plates (12). The cylinder (18) is installed on the top of the horizontal plate (17). The connecting plate (19) is fixed to one side of the lower mold (57). The output end of the cylinder (18) is fixedly connected to the horizontal plate (17). The drive assembly includes a mounting base (36), a bidirectional electric actuator (37), two racks (38), two guide rails (39), and two gears (40). The mounting base (36) is fixedly mounted on one side of one of the side plates (12). The bidirectional electric actuator (37) is mounted on the top of the mounting base (36). The two guide rails (39) are symmetrically arranged on both sides of the bidirectional electric actuator (37) and are fixed on the mounting base (36). Each rack (38) is slidably disposed inside one guide rail (39). The two ends of the bidirectional electric actuator (37) are fixedly connected to the two racks (38) respectively. Each gear (40) is located above one rack (38) and each gear (40) meshes with one rack (38). The telescopic assembly includes two swing rods (41), two slots (42), two insert rods (43), two strip grooves (27), and two moving rods (28). The two strip grooves (27) are symmetrically opened on the surface of the side plate (12). Each moving rod (28) is slidably disposed inside a strip groove (27). One end of the two moving rods (28) is connected to the cutting blade (29) and one of the moving plates (30) respectively. The other end of the two moving rods (28) is fixedly connected to the two insert rods (43) respectively. The top of the mounting base (36) is symmetrically fixed with two fixing plates. Each gear (40) is rotatably mounted on a fixing plate via a rotating shaft. One end of each rocker arm (41) is fixedly connected to the rotating shaft on a gear (40). Each slot (42) is opened at the end of a rocker arm (41) away from the gear (40). Each insert rod (43) is inserted into the inside of a slot (42).

2. The pipette tip injection molding device according to claim 1, characterized in that, The connecting assembly includes a socket (34) and an electric actuator (35). The socket (34) is located at one end of one of the movable plates (30), and the electric actuator (35) is mounted inside the other movable plate (30). The inner diameter of the socket (34) matches the outer diameter of the output end of the electric actuator (35).

3. The pipette tip injection molding device according to claim 2, characterized in that, A support plate (56) is fixed on the side of the two side plates (12) away from the cylinder (18), and the cooling cylinder (48) is fixedly installed on the top of the support plate (56).

4. The pipette tip injection molding device according to claim 3, characterized in that, The extrusion assembly includes a pull rope (44), a guide wheel (45), a pull rod (46), a piston plate (47), and multiple second springs (55). The piston plate (47) is slidably disposed inside the cooling cylinder (48). One end of the pull rod (46) is fixedly connected to the piston plate (47), and the other end of the pull rod (46) passes through the cooling cylinder (48) and is connected to one end of the pull rope (44). The guide wheel (45) is rotatably disposed at the top of the support plate (56), and the other end of the pull rope (44) passes around the guide wheel (45) and is fixedly connected to the cutting blade (29). Multiple second springs (55) are located at the end of the piston plate (47) away from the pull rod (46). Each second spring (55) is connected to the cooling cylinder (48) and the piston plate (47) at both ends respectively. The cooling cylinder (48) is provided with a through hole (54) at the end away from the pull rope (44). An air inlet pipe (53) is installed on the surface of the cooling cylinder (48) near the pull rope (44).

5. The pipette tip injection molding device according to claim 4, characterized in that, The delivery assembly includes an outlet pipe (50) and multiple connecting pipes (51). The outlet pipe (50) is located below the inlet pipe (53). One end of the outlet pipe (50) is connected to the cooling cylinder (48), and the other end of the outlet pipe (50) is connected to multiple nozzles (52) through multiple connecting pipes (51).

6. The pipette tip injection molding device according to claim 5, characterized in that, Vertical grooves are provided on the surfaces of the two side plates (12), and a movable block (22) is slidably provided inside each vertical groove. Each movable block (22) is fixedly connected to the lower mold (57). A fixed block (20) is fixed on the side of the two side plates (12) that is far apart from each other. A sliding rod (21) is slidably provided on each movable block (22). The top end of each sliding rod (21) is fixedly connected to the fixed block (20). A first spring (23) is sleeved on the outside of each sliding rod (21). The two ends of each first spring (23) are respectively connected to the fixed block (20) and the movable block (22). The bottom end of the upper mold (13) is fixed with multiple guide rods (25), and the top end of the lower mold (57) is provided with multiple guide grooves (26) that cooperate with the guide rods (25).

7. The pipette tip injection molding device according to claim 6, characterized in that, Each cutting seat (31) has multiple clearance slots (33) on the side away from the moving plate (30), and each clearance slot (33) is located above the cutting slot (32).

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