Injection molding mold for pipettor suction head

Abstract

The utility model discloses a pipettor suction head injection molding mold, which belongs to the technical field of injection molds, and comprises a plurality of mold inserts which are axially superposed to form a suction head cavity and a mold core which is sleeved on the peripheries of the mold inserts, and the mold inserts are provided with a plurality of outer planes which are annularly distributed along the central axes of the mold inserts. And the outer plane is a reference surface of the mold insert increasing and decreasing main body. According to the technical scheme, the mold insert with the outer plane is arranged, the datum plane is provided for increasing or decreasing the mold insert body, and it is ensured that the relative position between the central axis of the mold insert and the central axis of the suction head cavity is adjustable.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, specifically relating to an injection molding mold for a pipette tip. Background Technology

[0002] Pipette tips are long, thin tubular plastic consumables, which are usually injection molded.

[0003] Chinese Patent No. CN220903970U discloses an injection mold for a pipette tip, comprising a front mold and a rear mold. The front mold includes a panel, a runner plate, and an A-plate, with a hot runner inside the runner plate. The A-plate has several front mold cores, and each front mold core contains a mold insert assembly. The rear mold includes a base plate, a B-plate, and a push plate, with a rear mold insert on the base plate. The rear mold insert passes through the B-plate and the push plate and extends into the front mold cores, defining the pipette tip cavity together with the mold insert assembly. The A-plate has a runner insert at the parting surface between the front and rear molds, located outside the front mold cores. The front mold cores have two V-shaped submersible gates outside the pipette tip cavity, which communicate with the runner channels of the runner inserts.

[0004] When producing different models of pipette tips, the mold insert assembly needs to be removed from the front mold core and replaced with another mold insert assembly. The newly replaced mold insert assembly has a positional deviation within the cavity of the front mold core; that is, the central axis of the mold insert assembly is not collinear with the central axis of the cavity. Furthermore, because the mold insert assembly consists of several individual mold inserts stacked axially, the central axes of these individual mold inserts are also not collinear, making it impossible to guarantee the coaxiality accuracy of the pipette tip.

[0005] Currently, the proposed solutions are to add a rigid structure to the mold insert or to reduce the size of the mold insert body to adjust the relative position between the central axis of the mold insert body and the central axis of the suction head cavity, ensuring that the central axis of the suction head cavity is aligned with the central axis of the cavity of the front mold core. However, the existing mold insert is cylindrical with a curved outer surface, making it difficult to determine the location for adding a rigid structure or reducing the size of the mold insert body. This directly results in the inability to adjust the relative position between the central axis of the mold insert body and the central axis of the suction head cavity. Utility Model Content

[0006] This invention provides a pipette tip injection molding die to solve the problem that the outer surface of current cylindrical mold inserts does not have a reference surface for the main body of the mold insert.

[0007] To solve the above-mentioned technical problems, the technical solution of this utility model is: a pipette tip injection molding mold, comprising a plurality of mold inserts stacked axially to form a pipette tip cavity, and a mold core sleeved on the outer periphery of the plurality of mold inserts, wherein the mold inserts have a plurality of outer planes arranged around their central axis, and the outer planes are reference planes for adding or removing the main body of the mold inserts.

[0008] Specifically, the outer plane is parallel to the central axis of the mold insert.

[0009] Specifically, the mold insert has an even number of outer planes.

[0010] Specifically, the mold insert has four outer planes.

[0011] Specifically, two of the opposite outer planes are provided with gates that connect to the suction head cavity, and the other two opposite outer planes are provided with slots.

[0012] Specifically, the mold core is detachably fixed in the mold core cavity of plate A. A pin hole is opened at the bottom of the mold core. One end of the pin passes through the pin hole and abuts against the groove wall, and the other end abuts against the inner wall of the mold core cavity.

[0013] Specifically, the top of the mold core extends radially to form a flange, and the top of the mold core cavity expands radially to form a step that supports the flange.

[0014] Specifically, an outer arc surface is provided between adjacent outer planes.

[0015] Specifically, the plurality of mold inserts are sequentially divided into a first mold insert, a second mold insert, and a third mold insert along the axial direction. The opening end of the suction head cavity is located at the bottom of the third mold insert, and the tip of the suction head cavity is located at the top of the second mold insert.

[0016] Specifically, the top surface of the second mold insert has an exhaust groove.

[0017] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0018] By setting a plane on the outer surface of the mold insert as an additional rigid structure, or by reducing the reference surface of the mold insert body, the relative position between the central axis of the mold insert body and the central axis of the pipette tip cavity can be adjusted, ensuring that the central axis of each mold insert is on the same straight line as the central axis of the mold insert cavity, thereby improving the coaxiality accuracy of the pipette tip. Attached Figure Description

[0019] Figure 1 This is a structural diagram of plate A in this utility model;

[0020] Figure 2 This is a utility model Figure 1 Sectional view along line AA;

[0021] Figure 3 This is an assembly drawing of the mold insert assembly in this utility model;

[0022] Figure 4 This is an exploded view of the mold insert assembly in this utility model;

[0023] Figure 5 This is another exploded view of the mold insert assembly in this utility model.

[0024] The diagram shows: 1. Plate A; 2. Mold cavity; 3. Mold core; 4. Flange; 5. Step; 6. Mold insert cavity; 7. First mold insert; 8. Second mold insert; 9. Third mold insert; 10. Pin hole; 11. Slot; 12. Pin shaft; 13. Outer plane; 14. Outer arc surface; 15. Suction head cavity; 16. First through hole; 17. Second through hole; 18. Venting groove; 19. Runner; 20. Gate. Detailed Implementation

[0025] For ease of understanding, the injection molding mold for the pipette tip is described below with reference to the embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation and positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figures 1 to 2 As shown, the pipette tip injection molding mold in this embodiment includes an A plate 1, on which a plurality of mold core cavities 2 are arranged in a certain pattern, and a detachable mold core 3 is fixed in each mold core cavity 2.

[0029] like Figure 3As shown, the top of the mold core 3 extends radially to form a flange 4, and the top of the mold core cavity 2 expands radially to form a step 5 supporting the flange 4. From top to bottom, the diameter of the bottom of the mold core 3 gradually decreases and then remains constant, and the diameter of the mold core cavity 2 also gradually decreases and then remains constant. This design limits the mold core 3 to be inserted into the mold core cavity 2 vertically from top to bottom.

[0030] like Figures 3 to 4 As shown, the mold core 3 has a mold insert cavity 6 that is open at both ends. A mold insert assembly is embedded in the mold insert cavity 6. The mold insert assembly includes three mold inserts stacked along the axial direction. The three mold inserts are divided into a first mold insert 7, a second mold insert 8 and a third mold insert 9 along the axial direction.

[0031] Continue as Figures 3 to 4 As shown, the bottom of the mold core 3 has a pin hole 10 that is open at both ends, and the outer wall of the third mold insert 9 has a slot 11. One end of the pin shaft 12 abuts against the inner wall of the mold core cavity 2, and the other end passes through the pin hole 10 and abuts against the groove wall of the slot 11.

[0032] like Figure 4 As shown, the cross-section of the mold insert cavity 6 is square. Each of the three mold inserts has four outer planes 13 arranged around its central axis. The outer planes 13 are parallel to the central axis of the mold insert and serve as reference planes for adding or removing the main body of the mold insert. Adjacent or opposite outer planes 13 refer to each other. The position of the mold inserts in the mold insert cavity 6 is adjusted by adding rigid structures to the reference planes or by reducing the main body of the mold insert, ensuring that the central axes of the first mold insert 7, the second mold insert 8, and the third mold insert 9 are all aligned with the central axis of the mold insert cavity 6. When the mold inserts are not cut out with outer planes 13, they are cylindrical. If the diameter of the cylinder is smaller than the diagonal of the square mold insert cavity 6 but larger than the side length of the square mold insert cavity 6, it is impossible to cut out an outer plane 13 with a width equal to the side length of the square mold insert cavity 6. In this case, the four outer planes 13 cut out by the mold inserts have an outer arc surface 14 between them.

[0033] like Figures 3 to 5 As shown, the central cavity of the second mold insert 8 and the central cavity of the third mold insert 9 constitute the suction head cavity 15. The opening end of the suction head cavity 15 is located at the bottom of the third mold insert 9, and the tip of the suction head cavity 15 is located at the top of the second mold insert 8. The bottom of the first mold insert 7 has a first through hole 16 opposite to the tip of the suction head cavity 15, and the top of the second mold insert 8 has a second through hole 17. The central cavity of the first mold insert 7 is connected to the suction head cavity 15 through the second through hole 17 and the first through hole 16.

[0034] like Figure 5 As shown, the top surface of the second mold insert 8 is provided with an exhaust groove 18.

[0035] like Figure 1 and Figure 4As shown, the top of the first mold insert 7 has a gate 20 that is connected to the hot runner at one end and to the suction head cavity 15 at the other end.

[0036] In this embodiment, the three mold inserts are first assembled into the mold core 3, then the pin 12 is inserted, and finally the mold core 3 is assembled into plate A 1.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A pipette tip injection molding mold, characterized by, The mold insert includes a plurality of axial superimposed suction head cavities, and a mold core set outside the plurality of mold inserts, the mold insert has a plurality of outer planes arranged along the central axis of the mold insert, and the outer planes are the reference surfaces of the mold insert.

2. A pipette tip injection molding mold as defined in claim 1, wherein, The outer planes are parallel to the central axis of the mold insert.

3. A pipette tip injection molding mold as defined in claim 2, wherein, The mold insert has an even number of outer planes.

4. A pipette tip injection molding mold as defined in claim 3, wherein, The mold insert has four outer planes.

5. A pipette tip injection molding mold as defined in claim 4, wherein, Two oppositely arranged outer planes are provided with gates communicating with the suction head cavities, and the other two oppositely arranged outer planes are provided with clamping grooves.

6. A pipette tip injection molding mold as defined in claim 5, wherein, The mold core is detachably fixed in the mold core cavity of the A plate, the bottom of the mold core is provided with a pin hole, one end of the pin shaft passes through the pin hole and abuts against the clamping groove wall, and the other end abuts against the inner wall of the mold core cavity.

7. A pipette tip injection molding mold as defined in claim 6, wherein, The top of the mold core extends radially to form a flange, and the top of the mold core cavity extends radially to form a step supporting the flange.

8. A pipette tip injection molding mold as defined in claim 4, wherein, Arc surfaces are arranged between adjacent outer planes.

9. A pipette tip injection molding mold as defined in claim 1, wherein, The plurality of mold inserts are sequentially divided into a first mold insert, a second mold insert and a third mold insert along the axial direction, the open end of the suction head cavity is located at the bottom of the third mold insert, and the tip of the suction head cavity is located at the top of the second mold insert.

10. A pipette tip injection molding mold as defined in claim 9, wherein, The top surface of the second mold insert is provided with an exhaust groove.

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