A bacterial culture dish forming injection mold

Abstract

The utility model relates to a kind of bacterial culture dish forming injection mould, including from top to bottom sequentially laminated together's upper fixed plate, injection part mounting plate, upper die support plate, lower die support plate and lower fixed plate, and injection cavity assembly and injection part;Injection cavity assembly from top to bottom sequentially includes upper module, middle block and lower module.The utility model uses the three-layer combination structure of upper module, middle block and lower module, and forms culture dish forming cavity by upper model cavity and lower die boss cooperation, and the perforation of middle block and snap ring design can be flexibly adapted to the edge radian, height and other characteristics of culture dish, satisfy the complex forming demand of flat product.

Description

Technical Field

[0001] This utility model relates to the technical field of injection molding molds, and in particular to an injection mold for forming bacterial culture dishes. Background Technology

[0002] A mold is a mold and tool that uses external force to form a blank into a specific shape and size through methods such as injection molding, extrusion, and die casting. Molds are classified according to materials into hardware molds, plastic molds, and special molds. Among them, plastic molds have formed a huge industrial chain driven by high technology and the application needs of pillar industries, from raw and auxiliary material industries and processing and testing equipment to industries such as machinery, automobiles, home appliances, and building materials. Plastic molds are made by injecting molten plastic into a molding cavity, and after cooling and solidification, an ejection system ejects the product out of the mold cavity.

[0003] A search revealed Chinese patent publication number CN223071838U, which discloses a cell culture flask molding mold, comprising an upper fixing plate, an injection molding cavity plate, a front mold cavity plate, a rear mold cavity plate, and a lower fixing plate stacked from top to bottom, as well as injection molded parts; a bottle cap injection molding structure is provided on the rear mold cavity plate directly below the slot on the bottle cap, and a bottle base injection molding structure is provided on the rear mold cavity plate directly below the slot on the bottle base; an injection branch pipe passes through the through hole of the front mold cavity plate and is connected to the lower bottle cap injection molding structure or bottle base injection molding structure.

[0004] In summary, the existing molding die cavity structure lacks flexibility. The cavity structure is a double-layer fit between the top cover and the base, which can only be adapted to bottle-type parts of specific shapes and cannot meet the molding requirements of flat products such as petri dishes.

[0005] In view of the above-mentioned shortcomings, the designer actively researched and innovated in order to create a bacterial culture dish injection mold that would have greater industrial application value. Utility Model Content

[0006] To solve the above-mentioned technical problems, the purpose of this utility model is to provide an injection mold for forming bacterial culture dishes.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A bacterial culture dish molding injection mold includes an upper fixing plate, an injection part mounting plate, an upper mold support plate, a lower mold support plate and a lower fixing plate stacked together from top to bottom, as well as an injection cavity assembly and an injection part;

[0009] The injection molded part is installed in the injection mounting groove opened at the top of the injection molded part mounting plate. An injection main pipe is installed at the middle position of the top of the injection molded part. The injection main pipe is installed in the upper injection through hole opened in the middle of the upper fixed plate. Several injection branch pipes are installed at the bottom of the injection molded part.

[0010] The injection cavity assembly consists of an upper module, a middle block, and a lower module from top to bottom. The upper module is installed at the bottom of the upper mold support plate, and the lower module is installed at the top of the lower mold support plate.

[0011] An upper mold injection hole is provided on the top side of the upper module, which is connected to one of the injection branch pipes mentioned above. An upper mold cavity and an upper mold slot are provided sequentially from top to bottom at the bottom of the upper module. A through hole is provided on the inner side of the middle block. An intermediate retaining ring is provided on the outer side of the top of the through hole. A lower mold boss is provided on the top of the lower module. After the through hole passes through the lower mold boss, the middle block is installed on the lower module. Then the upper mold slot and the intermediate retaining ring are installed together.

[0012] As a further improvement of this utility model, the upper mold support plate and the lower mold support plate are installed together by a number of support columns.

[0013] As a further improvement of this utility model, a top support hole for accommodating the upper module is provided at the bottom of the upper mold support plate above the upper module.

[0014] As a further improvement of this utility model, a bottom support hole for accommodating the lower module is provided on the top of the lower mold support plate below the lower module.

[0015] As a further improvement of this utility model, a rangefinder is also installed between the upper mold support plate and the lower mold support plate.

[0016] As a further improvement of this utility model, a sealing ring is installed between the upper mold slot and the middle retaining ring.

[0017] As a further improvement of this utility model, a sealing ring is installed between the intermediate retaining ring and the lower mold boss.

[0018] As a further improvement of this utility model, the number of injection molding cavity components is eight.

[0019] By means of the above solution, this utility model has at least the following advantages:

[0020] This utility model adopts a three-layer combination structure of upper module, middle block and lower module. The upper mold cavity and the lower mold boss cooperate to form a culture dish forming cavity. The perforation and retaining ring design of the middle block can flexibly adapt to the edge curvature, height and other characteristics of the culture dish, and meet the complex forming requirements of flat products.

[0021] This invention can simultaneously mold multiple culture dishes in a single operation, and combined with a multi-injection pipe design, it significantly improves mass production capacity.

[0022] This invention installs sealing rings between the upper mold slot and the middle retaining ring, and between the middle retaining ring and the lower mold boss, which effectively prevents molten plastic from overflowing, reduces defects such as flash and material shortage, and improves the product qualification rate.

[0023] This utility model adds a rangefinder to monitor the mold closing distance between the upper mold support plate and the lower mold support plate in real time, which can be adjusted in time to avoid cavity misalignment and solve the problem of accuracy decay after long-term use.

[0024] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the following are the preferred embodiments of this utility model and are described in detail with reference to the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a bacterial culture dish injection mold according to this utility model;

[0027] Figure 2 yes Figure 1 Schematic diagram of the upper and middle fixed plates;

[0028] Figure 3 yes Figure 1 Top view after removing the upper fixing plate;

[0029] Figure 4 yes Figure 1 A schematic diagram of the structure after removing the upper fixing plate, injection molding part mounting plate, and upper mold support plate;

[0030] Figure 5 yes Figure 1 Schematic diagram of the structure of the lower mold support plate;

[0031] Figure 6 yes Figure 1 Schematic diagram of the structure of the injection molding cavity assembly;

[0032] Figure 7 yes Figure 6 A structural diagram of the upper and middle modules;

[0033] Figure 8 yes Figure 6 A schematic diagram of the structure after removing the upper module;

[0034] Figure 9 yes Figure 8 A schematic diagram of the structure of the middle block;

[0035] Figure 10 yes Figure 8 A schematic diagram of the structure after removing the intermediate block.

[0036] The meanings of the labels in the figures are as follows.

[0037] 1. Upper fixing plate, 2. Injection part mounting plate, 3. Upper mold support plate, 4. Lower mold support plate, 5. Lower fixing plate, 6. Injection cavity assembly, 7. Upper injection through hole, 8. Injection mounting groove, 9. Injection part, 10. Main injection pipe, 11. Branch injection pipe, 12. Support column, 13. Bottom support hole, 14. Upper module, 15. Upper mold injection hole, 16. Middle block, 17. Lower module, 18. Upper mold cavity, 19. Upper mold slot, 20. Middle retaining ring, 21. Petri dish, 22. Perforation, 23. Lower mold boss. Detailed Implementation

[0038] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0039] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0040] The first embodiment of this utility model:

[0041] like Figure 1 As shown, the bacterial culture dish molding injection mold of this embodiment mainly includes an upper fixing plate 1, an injection part mounting plate 2, an upper mold support plate 3, a lower mold support plate 4, a lower fixing plate 5, an injection cavity assembly 6, and an injection part 9. The upper fixing plate 1, injection part mounting plate 2, upper mold support plate 3, lower mold support plate 4, and lower fixing plate 5 are stacked together sequentially from top to bottom.

[0042] like Figures 2-4 As shown, the injection molded part 9 is installed in the injection mounting groove 8 opened at the top of the injection molded part mounting plate 2. An injection main pipe 10 is installed at the middle position of the top of the injection molded part 9. The injection main pipe 10 is installed in the upper injection through hole 7 opened at the middle of the upper fixed plate 1. Several injection branch pipes 11 are installed at the bottom of the injection molded part 9.

[0043] The upper mold support plate 3 and the lower mold support plate 4 are installed together by several support columns 12. The upper mold support plate and the lower mold support plate are connected by the support columns. Top support holes and bottom support holes are respectively provided on the upper mold support plate and the lower mold support plate to ensure that the upper and lower modules are installed firmly and resist deformation under injection pressure.

[0044] A distance measuring device is also installed between the upper mold support plate 3 and the lower mold support plate 4. The addition of the distance measuring device allows for real-time monitoring of the mold closing distance between the upper mold support plate and the lower mold support plate, enabling timely adjustments to avoid cavity misalignment and solve the problem of accuracy degradation over long-term use.

[0045] like Figures 6-10 As shown, there are eight injection cavity assemblies 6. The injection cavity assemblies 6, from top to bottom, include an upper module 14, a middle block 16, and a lower module 17. The upper module 14 is installed at the bottom of the upper mold support plate 3, and the lower module 17 is installed at the top of the lower mold support plate 4.

[0046] An upper mold injection hole 15 is provided on one side of the top of the upper module 14, which is connected to one of the injection branch pipes 11. An upper mold cavity 18 and an upper mold slot 19 are provided sequentially from top to bottom at the bottom of the upper module 14. A through hole 22 is provided on the inner side of the middle block 16. An intermediate retaining ring 20 is provided on the outer side of the top of the through hole 22. A lower mold boss 23 is provided on the top of the lower module 17. After the through hole 22 passes through the lower mold boss 23, the middle block 16 is installed on the lower module 17. Then the upper mold slot 19 and the intermediate retaining ring 20 are installed together, so that the upper mold cavity 18 and the lower mold boss 23 form the injection molding cavity of the culture dish 21.

[0047] like Figure 5 As shown, the bottom of the upper mold support plate 3 above the upper module 14 is provided with a top support hole for accommodating the upper module 14, and the top of the lower mold support plate 4 below the lower module 17 is provided with a bottom support hole 13 for accommodating the lower module 17.

[0048] A sealing ring is installed between the upper mold slot 19 and the intermediate retaining ring 20, and a sealing ring is installed between the intermediate retaining ring 20 and the lower mold boss 23. The installation of sealing rings between the upper mold slot and the intermediate retaining ring, and between the intermediate retaining ring and the lower mold boss, effectively prevents molten plastic from overflowing, reduces defects such as flash and material shortages, and improves the product qualification rate.

[0049] The second embodiment of this utility model:

[0050] This embodiment provides an injection mold for molding bacterial culture dishes, used for mass production of round bacterial culture dishes. The specific structure is as follows:

[0051] 1. Overall structural composition (layered from top to bottom)

[0052] Upper fixing plate 1: Made of 45# steel, with an upper injection through hole 7 in the middle for installing the injection main pipe 10.

[0053] Injection part mounting plate 2: Made of S50C steel, with an injection mounting groove 8 on the top (fitting the shape of the injection part 9) for fixing the injection part 9.

[0054] Upper mold support plate 3: Made of Cr12 mold steel, with bolt holes at the four corners of the bottom (for connecting support columns 12), and 8 top support holes in the middle of the bottom to accommodate the top of the upper module 14.

[0055] Lower mold support plate 4: The material is the same as the upper mold support plate 3. Threaded holes that mate with the support columns 12 are opened at the four corners of the top. Eight bottom support holes 13 are opened at the middle of the top to fix the lower module 17.

[0056] Lower fixing plate 5: Made of 45# steel, it is fixed to the lower mold support plate 4 with bolts to enhance overall stability.

[0057] Support columns 12: 4 columns, made of 45# steel with heat treatment, are distributed at the four corners of the upper mold support plate 3 and the lower mold support plate 4, and are rigidly connected by bolts to ensure structural stability when the mold is closed.

[0058] Injection cavity assembly 6: 8 groups in total, arranged in a 2×4 matrix. Each group includes:

[0059] Upper module 14: 718H mold steel (HRC35-40), with an upper mold injection hole 15 on one side of the top (to cooperate with the injection branch pipe 11), and an upper mold cavity 18 (with rounded corners R2 at the edges) and an upper mold slot 19 (annular groove) on the bottom.

[0060] Intermediate block 16: S136 mold steel (corrosion resistant), with a through hole 22 on the inner side and an intermediate retaining ring 20 on the outer side of the top (the annular protrusion fits the upper mold groove 19 with a tolerance of H7 / g6).

[0061] Lower module 17: same material as the middle block, with a raised lower mold boss 23 on the top (0.03mm gap between the boss and the perforation 22), and a 5mm distance between the top surface of the boss and the bottom of the upper mold cavity 18 (forming the bottom thickness of the petri dish).

[0062] Injection part 9: Made of PPS engineering plastic, installed in injection installation groove 8, with the top connected to the main injection pipe 10 (stainless steel material) and the bottom connected to 8 injection branch pipes 11 (PPS material, interference fit with the upper mold injection hole 15 + fluororubber O-ring seal).

[0063] Auxiliary components:

[0064] Sealing rings: made of food-grade silicone, installed on the mating surfaces of the upper mold slot 19 and the middle retaining ring 20, and on the top surface of the middle retaining ring 20 and the lower mold boss 23, with a compression of 30%.

[0065] Rangefinder: It can be a laser rangefinder sensor (model HL-G103-A-C5, measuring range 50-300mm, accuracy ±0.02mm), installed on the bottom edge of the upper mold support plate 3 to monitor the distance between it and the lower mold support plate 4 in real time.

[0066] 2. Work Process

[0067] Step 1: Mold preparation

[0068] The mold components are stacked and fixed according to the assembly relationship. The upper module 14 is embedded in the top support hole of the upper mold support plate 3, the lower module 17 is embedded in the bottom support hole 13 of the lower mold support plate 4, the middle block 16 is sleeved on the lower mold boss 23 through the through hole 22, the upper mold slot 19 is engaged with the middle retaining ring 20, and the sealing ring is compressed to form a seal.

[0069] The rangefinder is initialized, the target spacing for mold closing is set (calculated based on the height of the culture dish and the thickness of each module), and the data is transmitted to the injection molding machine control system in real time.

[0070] Step 2: Injection Molding Material Feeding

[0071] The injection molding machine pumps molten plastic (such as PP material) into the injection part 9 through the main injection pipe 10, and distributes it to 8 injection branch pipes 11 through the internal flow channel.

[0072] The molten material enters the molding cavity between the upper module 14 and the lower module 17 through the upper mold injection hole 15 (formed by the upper mold cavity 18, the lower mold boss 23 and the inner wall of the intermediate block 16, corresponding to the shape of the petri dish), and the sealing ring prevents the molten material from overflowing from the mating gap.

[0073] Step 3: Pressure Holding and Cooling

[0074] After injection molding, maintain cavity pressure for 10 seconds to ensure that the molten material fills the cavity details (such as the rounded corners of the petri dish edges).

[0075] The mold has built-in cooling water channels (located inside the upper module 14 and lower module 17, with a diameter of 8mm) that supply 25℃ cooling water for 30 seconds to solidify the molten material. During this period, a distance measuring device monitors the mold closing distance in real time. If the deviation exceeds ±0.05mm, the system automatically adjusts the injection pressure to compensate.

[0076] Step 4: Mold opening and part removal

[0077] After cooling is complete, the injection molding machine moves the upper fixed plate 1, the injection part mounting plate 2, and the upper mold support plate 3 upwards, and the upper module 14 separates from the middle block 16, while the middle block 16 remains stationary with the lower module 17.

[0078] The molded culture dishes 21 (8 pieces) remain on the lower mold boss 23. The culture dishes are ejected by the ejection mechanism (installed between the lower fixed plate 5 and the lower mold support plate 4) to complete the removal of the pieces.

[0079] Step 5: Circular Production

[0080] After the part is removed, the mold is closed again, and steps 2-4 are repeated to achieve continuous batch production.

[0081] This embodiment ensures the dimensional accuracy (±0.1mm) and surface quality (Ra0.8μm) of the culture dish through modular design, multiple sealing, and precision monitoring, meeting the sterility and flatness requirements of bacterial culture containers, while significantly improving production efficiency.

[0082] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships 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," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0083] 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.

[0084] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A bacterial culture dish molding injection mold, comprising an upper fixing plate (1), an injection part mounting plate (2), an upper mold support plate (3), a lower mold support plate (4) and a lower fixing plate (5) stacked together from top to bottom, as well as an injection cavity assembly (6) and an injection part (9). Its features are: The injection molded part (9) is installed in the injection mounting groove (8) opened at the top of the injection molded part mounting plate (2). An injection main pipe (10) is installed at the middle position of the top of the injection molded part (9). The injection main pipe (10) is installed in the upper injection through hole (7) opened at the middle of the upper fixed plate (1). Several injection branch pipes (11) are installed at the bottom of the injection molded part (9). The injection cavity assembly (6) includes, from top to bottom, an upper module (14), a middle block (16) and a lower module (17). The upper module (14) is installed at the bottom of the upper mold support plate (3), and the lower module (17) is installed at the top of the lower mold support plate (4). An upper mold injection hole (15) is provided on the top side of the upper module (14) and is connected to one of the injection branch pipes (11) mentioned above. An upper mold cavity (18) and an upper mold slot (19) are provided from top to bottom on the bottom of the upper module (14). A through hole (22) is provided on the inner side of the middle block (16). An intermediate retaining ring (20) is provided on the outer side of the top of the through hole (22). A lower mold boss (23) is provided on the top of the lower module (17). After the through hole (22) passes through the lower mold boss (23), the middle block (16) is installed on the lower module (17). Then the upper mold slot (19) and the intermediate retaining ring (20) are installed together.

2. The bacterial culture dish molding injection mold as described in claim 1, characterized in that, The upper mold support plate (3) and the lower mold support plate (4) are installed together by a number of support columns (12).

3. The bacterial culture dish molding injection mold as described in claim 1, characterized in that, A top support hole for accommodating the upper module (14) is provided at the bottom of the upper mold support plate (3) above the upper module (14).

4. The bacterial culture dish molding injection mold as described in claim 1, characterized in that, A bottom support hole (13) for accommodating the lower module (17) is provided on the top of the lower mold support plate (4) below the lower module (17).

5. The bacterial culture dish molding injection mold as described in claim 1, characterized in that, A rangefinder is also installed between the upper mold support plate (3) and the lower mold support plate (4).

6. The bacterial culture dish molding injection mold as described in claim 1, characterized in that, A sealing ring is installed between the upper mold slot (19) and the middle retaining ring (20).

7. The bacterial culture dish molding injection mold as described in claim 1, characterized in that, A sealing ring is installed between the intermediate retaining ring (20) and the lower mold boss (23).

8. The bacterial culture dish molding injection mold as described in claim 1, characterized in that, The number of injection molding cavity assemblies (6) is eight.

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