Injection mould for a full-plastic drip-proof self-suction quantitative pipette

Abstract

The utility model provides a kind of full plastic drip-proof self-suction ration straw injection molding mould, belong to mould technical field.It includes upper die plate and lower die plate, the upper die plate and lower die plate between being provided with matrix type straw forming mechanism, the upper die plate upside is provided with multipoint injection molding plate, the multipoint injection molding plate bottom is provided with several injection tubes, the multipoint injection molding plate and upper die plate between still being provided with injection tube fixing structure, the matrix type straw forming mechanism includes several straw forming subassembly of rectangular matrix distribution. Through the cooperation of matrix type straw forming mechanism and multipoint injection molding plate, the synchronous forming of multiple straws can be realized, the inside and outside synchronous cooling design of circumferential type outer cooling structure and inner cooling structure solves the problem of low cooling efficiency of traditional mould single side, shortens glue liquid solidification time, improves production efficiency;Injection tube fixing structure ensures that injection tube is positioned accurately, avoids injection deviation to affect straw forming precision.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to an injection molding mold for an all-plastic anti-drip self-priming quantitative straw. Background Technology

[0002] All-plastic anti-drip self-priming metering pipettes are generally injection molded. After injecting the adhesive into the molding cavity of the mold, coolant needs to be introduced into the mold to improve the cooling effect of the adhesive in the molding cavity. However, the cooling structure in the existing technology can only achieve cooling from the outside of the molding cavity to the inside, which has low cooling efficiency.

[0003] For example, a Chinese patent discloses a motor housing with shock absorption and noise reduction functions [application number: 201710648960.2], including a base. The base has a hollow internal structure, and side plates are fixedly connected to the top of both ends of the base by fixing bolts. A top plate is fixedly connected to the top of the side plates, and a fixed shaft is fixedly connected to the inner wall of the top of the side plates. Several noise-reducing fan blades are movably connected to the fixed shaft. Two brackets are fixedly connected to the base, and the two brackets are located between the two side plates. A rotor is movably connected to the brackets through bearings. A shock-absorbing baffle is movably connected to the outer wall of the rotor. A rotor shock-absorbing spring is fixedly connected to the shock-absorbing baffle. The other end of the rotor shock-absorbing spring is fixedly connected to the side wall of the bracket. A fixing pin is provided at the bottom of both brackets. The fixing pin penetrates the base and extends into the inner cavity of the base. A fixing pin shock-absorbing spring is fixedly connected to the outer wall of both fixing pins. The other end of the fixing pin shock-absorbing spring is fixedly connected to the side walls of both ends of the inner cavity of the base. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned problems by providing an injection molding mold for an all-plastic anti-drip self-priming metering pipette.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A full-plastic anti-drip self-priming metering straw injection molding mold includes an upper mold plate and a lower mold plate. A matrix straw forming mechanism is provided between the upper mold plate and the lower mold plate. A multi-point injection plate is provided on the upper side of the upper mold plate, and a plurality of injection tubes are provided at the bottom of the multi-point injection plate. An injection tube fixing structure is also provided between the multi-point injection plate and the upper mold plate. The matrix straw forming mechanism includes a plurality of straw forming components distributed in a rectangular array. A surrounding external cooling structure is provided between the upper mold plate and the straw forming components. A bottom plate is provided on the lower side of the lower mold plate, and an internal cooling structure communicating with the inside of the straw forming components is provided on the bottom plate.

[0007] In the above-mentioned all-plastic anti-drip self-priming metering straw injection molding mold, the straw forming component includes an outer mold sleeve, an upper mold cover disposed on the upper side of the outer mold sleeve, and an intermediate insert inserted into the outer mold sleeve from the bottom of the outer mold sleeve, wherein a forming cavity is formed between the upper mold cover, the outer mold sleeve, and the intermediate insert.

[0008] In the above-mentioned all-plastic anti-drip self-priming metering pipette injection molding mold, the surrounding external cooling structure includes several annular cooling grooves arranged in a ring on the outer side wall of the outer mold sleeve. The upper template is provided with an upper cooling channel connected to the annular cooling grooves. The upper template is provided with a mold sleeve mounting groove for installing the outer mold sleeve. The upper cooling channel has an opening at the side wall of the mold sleeve mounting groove and the opening is connected to the annular cooling groove.

[0009] In the above-mentioned all-plastic anti-drip self-priming metering pipette injection mold, the internal cooling structure includes a lower cooling channel set on the base plate, and a vertical internal cooling channel is set in the middle insert, with the bottom of the vertical internal cooling channel connected to the lower cooling channel.

[0010] In the above-mentioned all-plastic anti-drip self-priming metering pipette injection molding mold, a sealing sleeve is also provided on the lower side of the outer mold sleeve, the lower end of the middle insert is located inside the sealing sleeve, and the bottom of the outer mold sleeve is inserted into the limiting groove at the top of the sealing sleeve.

[0011] In the above-mentioned all-plastic anti-drip self-priming metering pipette injection molding mold, the sealing sleeve is detachably set on the top of the lower template by several bolts.

[0012] In the above-mentioned all-plastic anti-drip self-priming metering pipette injection molding mold, the top of the upper mold cover is recessed inward and has a glue inlet groove corresponding to the injection tube, and the bottom of the glue inlet groove is provided with a glue inlet connected to the molding cavity.

[0013] In the above-mentioned all-plastic anti-drip self-priming metering pipette injection molding mold, a sealing strip is provided at the connection between the upper mold cover and the outer mold sleeve.

[0014] In the above-mentioned all-plastic anti-drip self-priming metering pipette injection molding mold, the injection pipe fixing structure includes a fixing plate, and the fixing plate is provided with a plurality of fixing slots corresponding one-to-one with the injection pipe.

[0015] In the above-mentioned all-plastic anti-drip self-priming metering pipette injection molding mold, heating wires are provided on the upper and lower sides of the multi-point injection plate.

[0016] Compared with existing technologies, the advantages of this utility model are:

[0017] 1. Through the combination of matrix-type straw forming mechanism and multi-point injection plate, multiple straws can be formed simultaneously. The synchronous cooling design of the surrounding external cooling structure and internal cooling structure solves the problem of low cooling efficiency on one side of traditional molds, shortens the curing time of the glue, and improves production efficiency. The injection tube fixing structure ensures accurate positioning of the injection tube and avoids injection offset from affecting the straw forming accuracy.

[0018] 2. In the straw forming assembly, the combination of the outer mold sleeve, the upper mold cover and the middle insert forms the forming cavity. Its split design facilitates mold disassembly and maintenance. The precise cooperation of each component ensures that the forming cavity has a regular shape, so that the formed straw has a uniform wall thickness and high dimensional accuracy, avoiding straw deformation or dimensional deviation caused by mold structure errors.

[0019] 3. The annular cooling groove of the surrounding external cooling structure is set around the outer wall of the outer mold sleeve, increasing the cooling area. The upper cooling channel is connected to the annular cooling groove, so that the coolant flows evenly through the outer periphery of the outer mold sleeve, achieving uniform cooling of the outer side of the molding cavity. This structure solves the problem of uneven external cooling in traditional systems, reduces stress deformation caused by uneven cooling on the outer wall of the suction tube, and improves surface smoothness. The internal cooling structure is connected to the vertical internal cooling channel in the middle insert through the lower cooling channel, achieving cooling of the inner side of the molding cavity. It forms a synchronous internal and external cooling system with the external cooling structure, further improving cooling efficiency. Internal cooling can make the adhesive on the inner wall of the suction tube cure quickly, reduce the time difference between the inner and outer layers of curing, and reduce the risk of cracks caused by curing stress.

[0020] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the external structure of this utility model;

[0022] Figure 2 This is a partial structural schematic diagram of the present invention;

[0023] Figure 3 This is a cross-sectional view of the present invention;

[0024] Figure 4 This is a schematic diagram of a matrix-type straw forming mechanism.

[0025] In the diagram, 1 is the upper template, 2 is the lower template, 3 is the matrix-type straw forming mechanism, 4 is the multi-point injection plate, 5 is the injection tube, 6 is the injection tube fixing structure, 7 is the straw forming assembly, 8 is the surrounding external cooling structure, 9 is the base plate, 10 is the internal cooling structure, 11 is the outer mold sleeve, 12 is the upper mold cover, 13 is the intermediate insert, 14 is the molding cavity, 15 is the annular cooling groove, 16 is the upper cooling channel, 17 is the lower cooling channel, 18 is the vertical internal cooling channel, 19 is the sealing sleeve, 20 is the glue inlet groove, 21 is the sealing strip, 22 is the fixing plate, and 23 is the fixing slot. Detailed Implementation

[0026] like Figures 1-4 As shown, an all-plastic anti-drip self-priming metering straw injection molding mold includes an upper mold plate 1 and a lower mold plate 2. A matrix straw forming mechanism 3 is provided between the upper mold plate 1 and the lower mold plate 2. A multi-point injection plate 4 is provided on the upper side of the upper mold plate 1. Several injection tubes 5 are provided at the bottom of the multi-point injection plate 4. An injection tube fixing structure 6 is also provided between the multi-point injection plate 4 and the upper mold plate 1. The matrix straw forming mechanism 3 includes several straw forming components 7 distributed in a rectangular array. A surrounding external cooling structure 8 is provided between the upper mold plate 1 and the straw forming components 7. A bottom plate 9 is provided on the lower side of the lower mold plate 2. An internal cooling structure 10 communicating with the inside of the straw forming components 7 is provided on the bottom plate 9.

[0027] In this invention, the matrix-type straw forming mechanism, in conjunction with the multi-point injection plate, enables simultaneous forming of multiple straws. The synchronous cooling design of the surrounding external cooling structure and the internal cooling structure solves the problem of low cooling efficiency on one side of the traditional mold, shortens the curing time of the adhesive, and improves production efficiency. The injection tube fixing structure ensures accurate positioning of the injection tube and avoids injection offset from affecting the forming accuracy of the straw.

[0028] Specifically, the straw forming assembly 7 includes an outer mold sleeve 11, an upper mold cover 12 disposed on the upper side of the outer mold sleeve 11, and an intermediate insert 13 inserted into the outer mold sleeve 11 from the bottom. A forming cavity 14 is formed between the upper mold cover 12, the outer mold sleeve 11, and the intermediate insert 13. In the straw forming assembly, the combination of the outer mold sleeve, the upper mold cover, and the intermediate insert forms the forming cavity. Its split design facilitates mold disassembly and maintenance. The precise cooperation of each component ensures that the shape of the forming cavity is regular, resulting in a straw with uniform wall thickness and high dimensional accuracy, avoiding straw deformation or dimensional deviation caused by mold structure errors.

[0029] Specifically, the surrounding external cooling structure 8 includes several annular cooling grooves 15 arranged in a ring on the outer wall of the outer mold sleeve 11. The upper template 1 is provided with an upper cooling channel 16 connected to the annular cooling grooves 15. The upper template 1 is provided with a mold sleeve mounting groove for mounting the outer mold sleeve 11. The upper cooling channel 16 has an opening at the side wall of the mold sleeve mounting groove, and this opening communicates with the annular cooling grooves 15. The annular cooling grooves of the surrounding external cooling structure are arranged around the outer wall of the outer mold sleeve, increasing the cooling area. The upper cooling channel communicates with the annular cooling grooves, allowing the coolant to flow evenly around the outer periphery of the outer mold sleeve, achieving uniform cooling of the outer side of the molding cavity. This structure solves the problem of uneven external cooling in traditional methods, reduces stress deformation caused by uneven cooling on the outer wall of the suction tube, and improves surface finish.

[0030] Specifically, the internal cooling structure 10 includes a lower cooling channel 17 disposed on the base plate 9, and a vertical internal cooling channel 18 disposed within the intermediate insert 13, the bottom of which is connected to the lower cooling channel 17. The internal cooling structure, through the lower cooling channel and the vertical internal cooling channel within the intermediate insert, achieves cooling of the inner side of the molding cavity, forming a synchronous internal and external cooling system with the external cooling structure, further improving cooling efficiency. Internal cooling allows the adhesive on the inner wall of the suction tube to solidify rapidly, reducing the time difference between the inner and outer layers and lowering the risk of cracking due to curing stress.

[0031] Specifically, a sealing sleeve 19 is also provided on the lower side of the outer mold sleeve 11. The lower end of the intermediate insert 13 is located inside the sealing sleeve 19, and the bottom of the outer mold sleeve 11 is inserted into the limiting groove at the top of the sealing sleeve 19. The sealing sleeve is provided on the lower side of the outer mold sleeve, the lower end of the intermediate insert is located inside the sealing sleeve, and the bottom of the outer mold sleeve is inserted into the limiting groove of the sealing sleeve. This structure enhances the overall sealing of the mold and prevents the leakage of adhesive during injection molding. At the same time, the sealing sleeve supports and positions the intermediate insert, ensuring that the molding cavity remains stable under injection pressure and avoiding the impact of mold deformation on the forming quality of the straw.

[0032] Specifically, the mold sealing sleeve 19 is detachably mounted on the top of the lower template 2 by several bolts. The detachable mounting of the mold sealing sleeve on the top of the lower template by bolts facilitates the disassembly and replacement of the mold sealing sleeve; when the mold needs maintenance or replacement of vulnerable parts, the mold sealing sleeve can be quickly disassembled, shortening downtime for maintenance, improving production efficiency, and facilitating the cleaning and maintenance of the mold sealing sleeve and internal components.

[0033] Specifically, the top of the upper mold cover 12 is recessed inward and has a glue inlet groove 20 corresponding to the injection tube 5. The bottom of the glue inlet groove 20 has a glue inlet connected to the molding cavity 14. The glue inlet groove at the top of the upper mold cover corresponds to the injection tube, and the glue inlet at the bottom is connected to the molding cavity. This design allows the glue to be injected evenly into the molding cavity from the top center, avoiding pressure loss and uneven filling caused by excessive glue flow path. The shape design of the glue inlet groove can guide the glue to flow smoothly into the molding cavity, reduce the generation of air bubbles, and make the internal structure of the suction tube dense.

[0034] Specifically, a sealing strip 21 is provided at the connection between the upper mold cover 12 and the outer mold sleeve 11. The sealing strip at the connection between the upper mold cover and the outer mold sleeve enhances the sealing performance of the mold during the injection molding process, prevents the glue from overflowing from the connection, and avoids mold contamination and straw forming defects caused by glue leakage; at the same time, the sealing strip can reduce injection pressure loss, ensure stable glue pressure in the molding cavity, and ensure the consistency of straw forming dimensions.

[0035] Specifically, the injection tube fixing structure 6 includes a fixing plate 22, on which a plurality of fixing slots 23 corresponding one-to-one with the injection tubes 5 are provided. The fixing plate of the injection tube fixing structure positions and fixes the injection tubes through the fixing slots, ensuring that the position of the injection tube is stable during the injection process and avoiding deviations in the injection position of the adhesive due to shaking or displacement of the injection tube; this structure can improve the installation consistency of multiple injection tubes, make the molding quality of each tube uniform, and reduce the scrap rate caused by positioning problems of the injection tubes.

[0036] Specifically, heating wires are installed on the upper and lower sides of the multi-point injection plate 4. These heating wires heat the injection plate and injection tube, maintaining the fluidity of the adhesive during injection and preventing injection difficulties and incomplete filling caused by decreased adhesive temperature. The heating wires also allow for temperature adjustment based on adhesive characteristics, adapting to the injection requirements of different adhesive materials and improving the mold's applicability.

[0037] The working principle of this utility model is as follows: Through the cooperation of the matrix-type straw forming mechanism and the multi-point injection plate, multiple straws can be formed simultaneously. The synchronous cooling design of the surrounding external cooling structure and the internal cooling structure solves the problem of low cooling efficiency on one side of the traditional mold, shortens the curing time of the glue, and improves production efficiency. The injection tube fixing structure ensures accurate positioning of the injection tube and avoids injection offset from affecting the straw forming accuracy.

[0038] In the straw forming assembly, the outer mold sleeve, upper mold cover, and intermediate insert combine to form the forming cavity. Its modular design facilitates mold disassembly and maintenance. Precise fit between components ensures a regular shape of the forming cavity, resulting in a straw with uniform wall thickness and high dimensional accuracy. This avoids straw deformation or dimensional deviations caused by mold structure errors. The annular cooling groove of the surrounding external cooling structure encircles the outer wall of the outer mold sleeve, increasing the cooling area. The upper cooling channel connects to the annular cooling groove, allowing coolant to flow evenly across the outer circumference of the outer mold sleeve, achieving uniform cooling of the outer side of the forming cavity. This structure solves the problem of uneven external cooling in traditional systems, reducing stress deformation on the straw's outer wall caused by uneven cooling and improving surface finish. The internal cooling structure connects to the vertical internal cooling channel within the intermediate insert via the lower cooling channel, achieving cooling of the inner side of the forming cavity. This forms a synchronous internal and external cooling system with the external cooling structure, further improving cooling efficiency. Internal cooling allows the adhesive on the inner wall of the straw to cure quickly, reducing the time difference between the inner and outer layers and lowering the risk of cracks caused by curing stress.

[0039] A sealing sleeve is installed on the lower side of the outer mold sleeve, with the lower end of the middle insert located inside the sealing sleeve. The bottom of the outer mold sleeve is inserted into the limiting groove of the sealing sleeve. This structure enhances the overall sealing of the mold and prevents glue leakage during injection. Simultaneously, the sealing sleeve supports and positions the middle insert, ensuring the molding cavity remains stable under injection pressure and preventing mold deformation from affecting the quality of the straw molding. The sealing sleeve is detachably mounted on the top of the lower mold plate by bolts, facilitating its disassembly and replacement. When the mold requires maintenance or replacement of vulnerable parts, the sealing sleeve can be quickly disassembled, shortening downtime for maintenance, improving production efficiency, and facilitating cleaning and maintenance of the sealing sleeve and internal components. (Upper mold cover...) The top inlet groove corresponds to the injection tube, and the bottom inlet is connected to the molding cavity. This design allows the glue to be injected evenly into the molding cavity from the top center, avoiding pressure loss and uneven filling caused by excessive glue flow path. The shape of the inlet groove guides the glue to flow smoothly into the molding cavity, reducing air bubble formation and making the internal structure of the straw dense. A sealing strip is installed at the connection between the upper mold cover and the outer mold sleeve, which enhances the sealing of the mold during the injection process, preventing glue from overflowing from the connection and avoiding mold contamination and straw forming defects caused by glue leakage. At the same time, the sealing strip can reduce injection pressure loss, ensure stable glue pressure in the molding cavity, and ensure the consistency of straw forming dimensions.

[0040] The fixing plate of the injection tube fixing structure positions and fixes the injection tube through fixing slots, ensuring the stability of the injection tube during the injection process and avoiding deviations in the injection position caused by the injection tube shaking or shifting. This structure can improve the installation consistency of multiple injection tubes, making the molding quality of each tube uniform and reducing the scrap rate caused by injection tube positioning problems. Heating wires are set on the upper and lower sides of the multi-point injection plate to heat the injection plate and injection tubes, maintaining the fluidity of the glue during the injection process and avoiding injection difficulties and insufficient filling problems caused by glue temperature drop. The heating wires can be set to adjust the temperature according to the glue characteristics, adapting to the injection requirements of different glue materials and improving the applicability of the mold.

[0041] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0042] Although this article frequently uses terms such as upper template 1, lower template 2, matrix-type straw forming mechanism 3, multi-point injection plate 4, injection tube 5, injection tube fixing structure 6, straw forming assembly 7, surrounding external cooling structure 8, base plate 9, internal cooling structure 10, outer mold sleeve 11, upper mold cover 12, intermediate insert 13, molding cavity 14, annular cooling groove 15, upper cooling channel 16, lower cooling channel 17, vertical internal cooling channel 18, sealing sleeve 19, glue inlet groove 20, sealing strip 21, fixing plate 22, fixing slot 23, etc., these terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would be contrary to the spirit of this utility model.

Claims

1. A fully plastic anti-drip self-priming metering straw injection molding mold, comprising an upper mold plate (1) and a lower mold plate (2), characterized in that, A matrix-type straw forming mechanism (3) is provided between the upper template (1) and the lower template (2). A multi-point injection plate (4) is provided on the upper side of the upper template (1). Several injection tubes (5) are provided at the bottom of the multi-point injection plate (4). An injection tube fixing structure (6) is also provided between the multi-point injection plate (4) and the upper template (1). The matrix-type straw forming mechanism (3) includes several straw forming components (7) arranged in a rectangular array. A surrounding external cooling structure (8) is provided between the upper template (1) and the straw forming components (7). A bottom plate (9) is also provided on the lower side of the lower template (2). An internal cooling structure (10) communicating with the inside of the straw forming components (7) is provided on the bottom plate (9).

2. The injection molding mold for the all-plastic anti-drip self-priming metering pipette according to claim 1, characterized in that, The straw forming assembly (7) includes an outer mold sleeve (11), an upper mold cover (12) disposed on the upper side of the outer mold sleeve (11), and an intermediate insert (13) inserted into the outer mold sleeve (11) from the bottom. A forming cavity (14) is formed between the upper mold cover (12), the outer mold sleeve (11), and the intermediate insert (13).

3. The injection molding mold for the all-plastic anti-drip self-priming metering pipette according to claim 2, characterized in that, The surrounding external cooling structure (8) includes several annular cooling grooves (15) arranged in a ring on the outer side wall of the outer mold sleeve (11). The upper template (1) is provided with an upper cooling channel (16) connected to the annular cooling grooves (15). The upper template (1) is provided with a mold sleeve mounting groove for installing the outer mold sleeve (11). The upper cooling channel (16) has an opening at the side wall of the mold sleeve mounting groove and the opening is connected to the annular cooling grooves (15).

4. The injection molding mold for the all-plastic anti-drip self-priming metering pipette according to claim 3, characterized in that, The internal cooling structure (10) includes a lower cooling channel (17) disposed on the base plate (9), and a vertical internal cooling channel (18) disposed in the middle insert (13), the bottom of which is connected to the lower cooling channel (17).

5. The injection molding mold for the all-plastic anti-drip self-priming metering pipette according to claim 4, characterized in that, The outer mold sleeve (11) is also provided with a sealing mold sleeve (19) on its lower side. The lower end of the middle insert (13) is located inside the sealing mold sleeve (19). The bottom of the outer mold sleeve (11) is inserted into the limiting groove at the top of the sealing mold sleeve (19).

6. The injection molding mold for the all-plastic anti-drip self-priming metering pipette according to claim 5, characterized in that, The sealing sleeve (19) is detachably mounted on the top of the lower template (2) by a number of bolts.

7. The injection molding mold for the all-plastic anti-drip self-priming metering pipette according to claim 2, characterized in that, The top of the upper mold cover (12) is recessed inward and has a glue inlet groove (20) corresponding to the injection tube (5). The bottom of the glue inlet groove (20) is provided with a glue inlet that is connected to the molding cavity (14).

8. The injection molding mold for the all-plastic anti-drip self-priming metering pipette according to claim 7, characterized in that, A sealing strip (21) is provided at the connection between the upper mold cover (12) and the outer mold sleeve (11).

9. The injection molding mold for the all-plastic anti-drip self-priming metering pipette according to claim 1, characterized in that, The injection tube fixing structure (6) includes a fixing plate (22), and the fixing plate (22) is provided with a plurality of fixing slots (23) corresponding one-to-one with the injection tube (5).

10. The injection molding mold for the all-plastic anti-drip self-priming metering straw according to claim 1, characterized in that, Heating wires are provided on the upper and lower sides of the multi-point injection molding plate (4).

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