A culture dish stack injection mold with matching bottom and cover

Abstract

The present invention provides a culture dish stack injection mold with a bottom cover matched with each other, comprising a hot runner mainboard located in the middle, wherein the hot runner mainboard is sequentially arranged with a hot runner fixed plate, a cavity plate, a push plate, a core fixed plate and a movable mold base plate to the left, and the hot runner mainboard is sequentially arranged with a hot runner fixed plate, a cavity plate, a push plate, a core fixed plate and a fixed mold base plate to the right, the fixed mold base plate is connected to the fixed mold of an injection molding machine, and the movable mold base plate is connected to the movable mold of the injection molding machine, a diverter plate is arranged in the hot runner mainboard, a feed rod is connected to the diverter plate, and the other end of the feed rod is connected to the injection molding machine nozzle after passing through the fixed mold base plate, a plurality of product cavities are arranged between the cavity plate, the push plate and the core fixed plate, the diverter plate diverts the molten material and then passes through the left and right hot runner fixed plates to enter each product cavity for filling and injection molding, an ejection cylinder is arranged on the core fixed plate, and the ejection cylinder piston rod is connected to the push plate, and after the mold is opened, the ejection cylinder is controlled to push the push plate to eject the product.

Description

Technical Field

[0001] The invention relates to a mould, in particular to a stacked injection mould for a culture dish with a bottom cover matched with each other. Background Art

[0002] In the current injection mold industry, the more product cavities there are, the more products can be molded at one time, but the structure will be more complex, the mold volume will be larger, and the mold manufacturing cost will be higher. In addition, the products molded in a set of molds can only be the same product. When there are several products that need to be molded, only one mold can be opened for each product, which is costly, requires more injection molding machines and sites, and has low injection efficiency. Summary of the invention

[0003] In view of the above problems, the present invention aims to provide a culture dish stack injection mold with a matching bottom cover, which has a novel structure, can inject multiple products at one time, and can also inject two different products at one time, with high injection efficiency.

[0004] The technical solution of the present invention is a culture dish stack injection mold with a bottom cover that matches each other, including a hot runner mainboard located in the middle, the hot runner mainboard is arranged with a hot runner fixed plate, a cavity plate, a push plate, a core fixed plate and a movable mold seat plate in sequence to the left, and the hot runner mainboard is arranged with a hot runner fixed plate, a cavity plate, a push plate, a core fixed plate and a fixed mold seat plate in sequence to the right, the fixed mold seat plate is connected to the fixed mold of the injection molding machine, the movable mold seat plate is connected to the movable mold of the injection molding machine, the hot runner mainboard and the hot runner fixed plate, and the hot runner fixed plate and the cavity plate are fixed by threaded connection, the hot runner mainboard is provided with a diverter plate, the diverter plate is connected with a feed rod, and the feed rod is provided with a through hole along its length direction. There is a main hot runner channel, the other end of the feed rod passes through the fixed mold base plate and is connected to the injection molding machine nozzle, a plurality of product cavities are arranged between the cavity plate, the push plate and the core fixed plate, and a diverter channel is arranged on the hot runner fixed plate corresponding to each product cavity position, the diverter plate diverts the molten material and passes through the left and right hot runner fixed plates, and then enters the respective product cavities on the left and right sides through the diverter channel for filling and injection molding, the fixed mold base plate and the core fixed plate, as well as the movable mold base plate and the core fixed plate are all fixed by threaded connections, an ejection cylinder is arranged on the core fixed plate, the piston rod of the ejection cylinder is detachably fixedly connected to the push plate, and the ejection cylinder is controlled to push the push plate to eject the product after the mold is opened.

[0005] Among them, the bottom cover is made on the same mold to ensure that the molding process parameters of each mold are similar, the shrinkage rate is close, and the dimensional stability is good. When a set of culture dish bottom covers is assembled and packaged later, the fully automatic packaging can achieve the same quantity and no extra batching action is required. It is preferred to have four external ejection cylinders, and each stack mold can achieve synchronous oil supply and ejection by setting 8X2 inlet / outlet oil lines to ensure the balance of the ejection action of the high-cavity stack mold, and the product will not stick to the mold or be scratched. This is especially important for culture dishes with high finish.

[0006] Preferably, a cylinder mounting groove is provided on the outer side surface of the core fixing plate, the ejection cylinder is connected to the cylinder mounting groove on the outer side surface of the core fixing plate by screws, the ejection cylinder piston rod penetrates into the push plate, and the push plate is provided with a stepped hole corresponding to the position of the ejection cylinder, a positioning block is provided in the stepped hole, and the positioning block is connected to the end surface of the piston rod of the ejection cylinder by screws so that a stable detachable fixed connection is formed between the ejection cylinder piston rod and the push plate.

[0007] Preferably, an external connecting fixing block is used to fix the ejector push plate to the cavity before opening the mold. When the mold is opened within an appropriate opening distance range, the ejector push plate can be disengaged from the core, exposing the stacked mold core for easy inspection and maintenance, especially polishing the core, solving the scratch defects on the inner wall of the high-finish culture dish, and realizing daily maintenance of the upper and lower molds of the large stacked mold on the mold and rapid mold repair.

[0008] Preferably, interconnected positioning grooves are provided on the sides of the core fixing plate, the push plate and the cavity plate, the positioning groove of the core fixing plate is connected with a first guide positioning block, the positioning groove of the push plate is connected with a second guide positioning block, and the positioning groove of the cavity plate is connected with a third guide positioning block, the rear ends of the first guide positioning block and the second guide positioning block are both provided with groove portions, the front ends of the second guide positioning block and the third guide positioning block are both provided with protrusions inserted into the groove portions, the first guide positioning block, the second guide positioning block and the third guide positioning block are engaged with each other through the protrusions and groove portions therebetween, so that the core fixing plate, the push plate and the cavity plate are kept precisely positioned when the mold is opened and closed.

[0009] Preferably, it also includes large guide pillars, and the number of the large guide pillars is four, which are distributed at four corner points. In the mold closing state, one end of the large guide pillar is located in the fixed mold base plate, and the other end passes through the core fixing plate, the push plate, the cavity plate, the hot runner fixing plate, the hot runner main plate, the hot runner fixing plate, the cavity plate, the push plate and the core fixing plate and is located in the movable mold base plate, wherein the two large guide pillars located on the diagonals are connected to the movable mold base plate by screws, and the other two large guide pillars located on the diagonals are connected to the fixed mold base plate by screws.

[0010] Preferably, assembly guide pillars are arranged between the cavity plate, push plate, core fixing plate and movable mold base plate, and the assembly guide pillars are inserted from the countersunk position on one side of the movable mold base plate and sequentially pass through the core fixing plate, push plate and cavity plate, and guide sleeves are arranged at corresponding assembly guide pillars in the core fixing plate, push plate and cavity plate, and assembly guide pillars are arranged between the cavity plate, push plate, core fixing plate and fixed mold base plate, and the assembly guide pillars are inserted from the countersunk position on one side of the fixed mold base plate and sequentially pass through the core fixing plate, push plate and cavity plate, and guide sleeves are arranged at corresponding assembly guide pillars in the core fixing plate, push plate and cavity plate.

[0011] Preferably, a pre-positioning block is connected to the middle position of the lower surface of the hot runner main board and the hot runner fixed plate, a longitudinal bottom supporting beam is arranged below the pre-positioning block, sliders are connected to the lower surfaces of both ends of the bottom supporting beam, and the sliders are installed on two horizontal linear rails on the injection molding machine, and a positioning groove is opened on the lower surface of the pre-positioning block, and the top of the bottom supporting beam is inserted into the positioning groove to play a lateral limiting role.

[0012] Preferably, the mold hot runner system optimizes the needle valve hot runner nozzle and gate size, shape, and distribution position used for the bottom cover according to the data obtained from mold flow analysis and actual test results, ensuring the synchronization and balance of pouring and filling of the bottom cover stack mold.

[0013] Preferably, the top and bottom surfaces of the hot runner main board are connected to a gear rack, a freely rotatable gear is installed in the middle position of the gear rack, the top and bottom surfaces of the fixed and movable mold base plates are laterally connected to racks, one gear is correspondingly connected to two racks, the two racks are respectively located on both sides of the gear and are synchronously meshed with the gears, one end of the two racks is connected to the fixed mold base plate, and the other end is connected to the movable mold base plate, and the remaining suspended length of the rack after passing through the gear rack is greater than the mold opening distance when the mold is opened.

[0014] Preferably, the upper and lower surfaces of the movable mold base plate, the fixed mold base plate, the hot runner fixed plate and the cavity plate are all provided with pads of the same height for the entire mold to be placed flat, and the height of the pads is higher than that of the gear rack.

[0015] Preferably, the core fixing plate is provided with an oil inlet, an oil inlet oil circuit, an oil outlet and an oil outlet oil circuit, the oil inlet is connected to the oil inlet hole of the ejector oil cylinder through the oil inlet oil circuit, and the oil outlet is connected to the oil outlet hole of the ejector oil cylinder through the oil outlet oil circuit. The specially designed oil circuit structure ensures the balance of the oil pressure flow rate and flow rate of the four groups (8X2 oil circuits / sub-stack mold) inlet / outlet oil circuits for oil supply (oil inlet) and unloading return oil (oil outlet), thereby ensuring the synchronization of the actions of the two ejector oil cylinders on both sides.

[0016] Preferably, both the movable mold base plate and the fixed mold base plate are provided with positioning rings for positioning when connected to the injection molding machine.

[0017] The present invention has high injection molding efficiency, and can injection mold a plurality of products with two different structures by opening and closing the mold at one time, and is particularly suitable for series of plastic products that are used in conjunction with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the present invention after the top lifting ring is removed;

[0020] Figure 3 for Figure 2 A schematic diagram of the structure from another perspective;

[0021] Figure 4 for Figure 3 The main view of

[0022] Figure 5 for Figure 4 Cross-sectional view along CC direction;

[0023] Figure 6 for Figure 4 Cross-sectional view along AA direction;

[0024] Figure 7 for Figure 4 Cross-sectional view along direction BB;

[0025] Figure 8 It is a structural schematic diagram of the positions of the large guide pillar and the assembly guide pillar in the present invention;

[0026] Fig. 9 It is a schematic diagram of the structure of the hot runner main board, the diverter plate, the feed rod and the hot runner fixing plate in the present invention;

[0027] Fig.10 for Fig. 9 A schematic diagram of the structure from another perspective;

[0028] Fig.11 for Fig. 9 Schematic diagram of the structure after adding another hot runner fixing plate;

[0029] Fig.12 It is a schematic diagram of the connection structure between the hot runner main plate, the movable mold base plate, the fixed mold base plate and the gear rack in the present invention;

[0030] Fig.13 It is a schematic diagram of the structure between the core fixing plate and the ejection cylinder;

[0031] Fig.14 for Fig.13 Side view of

[0032] Fig.15 for Fig.14 Cross-sectional view along DD direction;

[0033] Fig.16 for Fig.14 Cross-sectional view along EE direction;

[0034] Among them: 1—hot runner main board; 2—hot runner fixed plate; 3—cavity plate; 4—push plate; 5—core fixed plate; 6—movable mold base plate; 7—fixed mold base plate; 8—manifold plate; 9—feed rod; 10—hot runner main channel; 11—product cavity; 12—manifold; 13—ejection cylinder; 14—stepped hole; 15—positioning block; 16—first guide positioning block; 17—second guide positioning block; 18—third guide positioning block; 19—large guide column; 20—assembly guide column; 21—pre-positioning block; 22—bottom support beam; 23—slider; 24—linear track; 25—positioning groove; 26—gear rack; 27—gear; 28—rack; 29—pad; 30—oil inlet; 31—oil inlet oil circuit; 32—oil outlet; 33—oil outlet oil circuit; 34—positioning ring. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0036] like Figures 1 to 7 , Figures 9 to 11As shown, the present invention provides a culture dish stack injection mold with a bottom cover that matches each other, including a hot runner main board 1 located in the middle, the hot runner main board 1 is sequentially arranged with a hot runner fixed plate 2, a cavity plate 3, a push plate 4, a core fixed plate 5 and a movable mold seat plate 6 to the left, the hot runner main board 1 is sequentially arranged with a hot runner fixed plate 2, a cavity plate 3, a push plate 4, a core fixed plate 5 and a fixed mold seat plate 7 to the right, the fixed mold seat plate 7 is connected to the fixed mold of the injection molding machine, the movable mold seat plate 6 is connected to the movable mold of the injection molding machine, the hot runner main board 1 and the hot runner fixed plate 2, the hot runner fixed plate 2 and the cavity plate 3 are fixed by threaded connection, the hot runner main board 1 is provided with a diverter plate 8, the diverter plate 8 is connected with a feed rod 9, and the feed rod 9 is provided with a hot runner main plate along its length. Channel 10, the other end of the feed rod 9 passes through the fixed mold base plate 7 and is connected to the injection molding machine nozzle, a plurality of product cavities 11 are arranged between the cavity plate 3, the push plate 4 and the core fixed plate 5, a diverter 12 is arranged on the hot runner fixed plate 2 corresponding to each product cavity 11, the diverter plate 8 diverts the molten material and passes through the left and right hot runner fixed plates 2 and then enters the respective product cavities 11 on the left and right sides through the diverter 12 for filling and injection molding, the fixed mold base plate 7 and the core fixed plate 5, and the movable mold base plate 6 and the core fixed plate 5 are fixed by threaded connection, and an ejection cylinder 13 is arranged on the core fixed plate 5, and the piston rod of the ejection cylinder 13 is detachably fixedly connected to the push plate 4, and the ejection cylinder 13 is controlled to push the push plate 4 to eject the product after the mold is opened.

[0037] Preferably, Figure 7 As shown, the outer side of the core fixing plate 5 is provided with a cylinder mounting groove, the ejection oil cylinder 13 is connected to the cylinder mounting groove on the outer side of the core fixing plate 5 by screws, the piston rod of the ejection oil cylinder 13 penetrates into the push plate 4, the push plate 4 is provided with a stepped hole 14 corresponding to the position of the ejection oil cylinder, a positioning block 15 is arranged in the stepped hole 14, and the positioning block 15 is connected to the end face of the piston rod of the ejection oil cylinder 13 by screws so that a stable detachable fixed connection is formed between the piston rod of the ejection oil cylinder 13 and the push plate 4. The shape of the stepped hole 14 can be the shape of a T-slot.

[0038] Preferably, Figure 1 and Figure 2As shown, interconnected positioning grooves are provided on the sides of the core fixing plate 5, the push plate 4 and the cavity plate 3, the positioning groove of the core fixing plate 5 is connected with a first guide positioning block 16, the positioning groove of the push plate 4 is connected with a second guide positioning block 17, the positioning groove of the cavity plate 3 is connected with a third guide positioning block 18, the rear ends of the first guide positioning block 16 and the second guide positioning block 17 are both provided with groove portions, the front ends of the second guide positioning block 17 and the third guide positioning block 18 are both provided with protrusions inserted into the groove portions, the first guide positioning block 16, the second guide positioning block 17 and the third guide positioning block 18 are engaged through the protrusions and groove portions therebetween so that the core fixing plate 5, the push plate 4 and the cavity plate 3 are kept precisely positioned when the mold is closed.

[0039] Preferably, Figure 7 and Figure 8 As shown, it also includes large guide pillars 19, the number of which is four and distributed at four corner points. In the mold closing state, one end of the large guide pillars 19 is located in the fixed mold base plate 7, and the other end passes through the core fixing plate 5, the push plate 4, the cavity plate 3, the hot runner fixing plate 2, the hot runner main plate 1, the hot runner fixing plate 2, the cavity plate 3, the push plate 4 and the core fixing plate 5 and is located in the movable mold base plate 6, wherein the two large guide pillars 19 located on the diagonal are connected to the movable mold base plate 6 by screws, and the other two large guide pillars 19 on the diagonal are connected to the fixed mold base plate 7 by screws. When the mold is opened, the large guide pillars 19 are relied on to ensure the concentricity and stability of the stack mold, and all moving plates will move along the large guide pillars 19. In addition, the sides of the push plate 4, the cavity plate 3 and the hot runner fixing plate 2 are provided with rectangular correction grooves connected in a straight line, and the mold closing accuracy of the stack mold is checked by a feeler gauge when the mold is closed.

[0040] Preferably, Figure 8 As shown, an assembly guide column 20 is arranged between the cavity plate 3, the push plate 4, the core fixing plate 5 and the movable mold base plate 6. The assembly guide column 20 is inserted from the countersunk position on one side of the movable mold base plate 6 and passes through the core fixing plate 5, the push plate 4 and the cavity plate 3 in sequence. Guide sleeves are arranged at the corresponding assembly guide column 20 in the core fixing plate 5, the push plate 4 and the cavity plate 3. An assembly guide column 20 is arranged between the cavity plate 3, the push plate 4, the core fixing plate 5 and the fixed mold base plate 7. The assembly guide column 20 is inserted from the countersunk position on one side of the fixed mold base plate 7 and passes through the core fixing plate 5, the push plate 4 and the cavity plate 3 in sequence. Guide sleeves are arranged at the corresponding assembly guide column 20 in the core fixing plate 5, the push plate 4 and the cavity plate 3. The setting of the assembly guide column 20 ensures that the cavity plate 3, the push plate 4, the core fixing plate 5 and the movable mold base plate 6 have better concentricity during assembly, which facilitates the smooth assembly of the four plates, and also facilitates the smooth assembly of the cavity plate 3, the push plate 4, the core fixing plate 5 and the fixed mold base plate 7.

[0041] Preferably, Figure 3 , 5 As shown in , 6 and 7, a pre-positioning block 21 is connected to the middle of the lower surface of the hot runner main board 1 and the hot runner fixed plate 2, and a longitudinal bottom support beam 22 is arranged below the pre-positioning block 21. Sliders 23 are connected to the lower surfaces of both ends of the bottom support beam 22. The slides 23 are installed on two horizontal linear rails 24 on the injection molding machine. A positioning groove 25 is provided on the lower surface of the pre-positioning block 21. The top of the bottom support beam 22 is inserted into the positioning groove 25 to play a lateral limiting role. The positioning groove 25 and the edge position of the bottom support beam 22 are both provided with chamfered parts for easy insertion. Since the weight of the mold is large, in order to offset the poor movement stability caused by the gravity of the mold, this kind of bridge-type bottom support is provided, and the two ends are supported on the linear rails added to the injection molding machine, and the middle part supports the mold body.

[0042] Preferably, Figure 2 , 3As shown in 12, the top and bottom surfaces of the hot runner main board 1 are connected to a gear rack 26, and a freely rotatable gear 27 is installed in the middle position of the gear rack 26. The top and bottom surfaces of the fixed and movable mold base plates 7, 6 are transversely connected to racks 28. One gear 27 is correspondingly connected to two racks 28, and the two racks 28 are respectively located on both sides of the gear 27 and are synchronously meshed with the gear 27. One end of the two racks 28 is connected to the fixed mold base plate 7, and the other end is connected to the movable mold base plate 6. The remaining suspended length of the rack 28 after passing through the gear rack 26 is greater than the mold opening distance when the mold is opened. The existence of the gear 27 and the rack 28 makes the mold movement on the left and right sides symmetrical when the mold is opened and closed. When the mold is opened, the movable mold part of the injection molding machine opens to drive the movable mold base plate 6 to move, while the fixed mold base plate 7 is connected to the fixed mold side of the injection molding machine and is fixed. Through the structure of gear and rack matching, the movable mold base plate 6 drives the cavity plate 3 on the fixed mold side to move to the left when it moves. At the same time, the movable mold base plate 6 itself drives the core fixing plate 5 on the movable mold side connected to it to move to the left synchronously, and the core fixing plate 5 on the movable mold side is connected to the push plate 4 on the movable mold side through the piston rod of the ejection cylinder 13, so the push plate 4 also moves to the left together. Therefore, after the mold is opened, all the plates from left to right are divided into three parts, as follows: the first part includes the adjacent movable mold base plate 6, the core fixing plate 5 , push plate 4 are located together on the far left; the second part includes cavity plate 3, hot runner fixing plate 2, hot runner main plate 1, hot runner fixing plate 2, and cavity plate 3, which are located together in the middle; the third part includes push plate 4, core fixing plate 5, and fixed mold base plate 7, which are located together on the right; the weight of the second part is supported by the bottom supporting beam 22, and the bottom supporting beam 22 slides freely on the linear track 24 following the mold opening action; then in the demolding stage, the piston rod of the ejection cylinder 13 ejects and drives the two push plates 4 on the left and right sides to eject the products in the product cavities on the left and right sides, and the products will fall automatically; after the ejection cylinder 13 is retracted, the injection molding machine mold will return to the inward movement, the principle is the same as above, and no further description will be given; all plates will return to the mold closing state, waiting for the next injection molding.

[0043] Preferably, Figures 1 to 4 As shown, the upper and lower surfaces of the movable mold base plate 6, the fixed mold base plate 7, the hot runner fixed plate 2 and the cavity plate 3 are all provided with pads 29 of the same height for the entire mold to be placed flat, and the height of the pads 29 is higher than the height of the gear frame 26. The existence of the pads 29 allows the entire mold to be placed horizontally and stably, and also protects the gear frame 26 and the rack 28 from being hit by some large-area hard objects.

[0044] Preferably, Figures 13 to 16As shown, the core fixing plate 5 is provided with an oil inlet 30, an oil inlet oil passage 31, an oil outlet 32 ​​and an oil outlet oil passage 33. The oil inlet 30 is connected to the oil inlet hole of the ejection oil cylinder 13 through the oil inlet oil passage 31, and the oil outlet 32 ​​is connected to the oil outlet hole of the ejection oil cylinder 13 through the oil outlet oil passage 33. Thus, multiple ejection oil cylinders 13 can be uniformly controlled through the same oil inlet pipe and the same oil outlet pipe.

[0045] Preferably, Figures 1 to 3 As shown, the movable mold base plate 6 and the fixed mold base plate 7 are both provided with a positioning ring 34 for positioning when connected to the injection molding machine, so as to ensure that the mold is concentric with the injection molding machine during installation and operation.

[0046] When in use, the movable mold base plate 6 is fixed on the movable mold of the injection molding machine, and the fixed mold base plate 7 is fixed on the fixed mold of the injection molding machine. After the mold is closed, the injection molding machine injects the molten plastic into the diverter plate 8 in the hot runner main board 1 through the hot runner main channel 10 of the feed rod 9, and then injects it into the product cavity through the diverter 12 for injection molding. After the injection molding is completed, the mold is opened, and the synchronous mold opening action of the product cavities on both sides is realized through the gear rack structure. When demolding, the product is ejected by the ejection cylinder 13. After the product automatically falls off, the mold is closed. After the mold is closed, injection molding is carried out, and the cycle is repeated. Finally, a threaded hole for connecting the lifting plate is set at the center of the top of each plate. When lifting is required, it is connected to each plate through the connecting plate with screws, and then connected to the center of the connecting plate with a lifting ring threaded on it to lift the entire mold, such as Figure 1 Shown in top position.

[0047] The above description is only a preferred embodiment of the present invention and does not impose any form of limitation on the invention. Any simple modification, equivalent change or modification made to the above embodiments based on the technical principle of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A stacked injection mold for a culture dish with a bottom cover matching each other, characterized in that: The hot runner main board (1) is located in the middle, and the hot runner main board (1) is arranged with a hot runner fixed plate (2), a cavity plate (3), a push plate (4), a core fixed plate (5) and a movable mold seat plate (6) in sequence to the left; the hot runner main board (1) is arranged with a hot runner fixed plate (2), a cavity plate (3), a push plate (4), a core fixed plate (5) and a fixed mold seat plate (7) in sequence to the right, the fixed mold seat plate (7) is connected to the fixed mold of the injection molding machine, the movable mold seat plate (6) is connected to the movable mold of the injection molding machine, and the hot runner main board (1) and the hot runner fixed plate (2) are connected to the fixed mold of the injection molding machine. ), and the hot runner fixed plate (2) and the cavity plate (3) are all fixed by threaded connection. A diverter plate (8) is arranged inside the hot runner main plate (1), and a feed rod (9) is connected to the diverter plate (8). A hot runner main channel (10) is arranged in the feed rod (9) along its length direction. The other end of the feed rod (9) passes through the fixed mold base plate (7) and is connected to the injection molding machine nozzle. A plurality of product cavities (11) are arranged between the cavity plate (3), the push plate (4) and the core fixed plate (5). A flow channel (12) is provided at each product cavity (11), and the flow channel (8) flows the molten material through the two hot runner fixing plates (2) on the left and right sides, and then enters each product cavity (11) on the left and right sides through the flow channel (12) for filling and injection molding. The fixed mold base plate (7) and the core fixing plate (5), and the movable mold base plate (6) and the core fixing plate (5) are fixed by threaded connection. The core fixing plate (5) is provided with an ejector cylinder (13), and the piston rod of the ejector cylinder (13) is detachably fixedly connected to the push plate (4). ), after the mold is opened, the ejection oil cylinder (13) is controlled to push the push plate (4) to eject the product; an oil inlet (30), an oil inlet oil circuit (31), an oil outlet (32) and an oil outlet oil circuit (33) are provided in the core fixing plate (5); the oil inlet (30) is communicated with the oil inlet hole of the ejection oil cylinder (13) through the oil inlet oil circuit (31), and the oil outlet (32) is communicated with the oil outlet hole of the ejection oil cylinder (13) through the oil outlet oil circuit (33); the movable mold base plate (6) and the fixed mold base plate (7) are both provided with positioning rings (34) for positioning when connected to the injection molding machine.

2. The stacked mold injection mold for a culture dish with a bottom cover matching each other according to claim 1, characterized in that: The outer side surface of the core fixing plate (5) is provided with a cylinder mounting groove, the ejection cylinder (13) is connected to the cylinder mounting groove on the outer side surface of the core fixing plate (5) by screws, the piston rod of the ejection cylinder (13) penetrates into the push plate (4), the push plate (4) is provided with a stepped hole (14) corresponding to the position of the ejection cylinder, a positioning block (15) is arranged in the stepped hole (14), and the positioning block (15) is connected to the end surface of the piston rod of the ejection cylinder (13) by screws, so that a stable detachable fixed connection is formed between the piston rod of the ejection cylinder (13) and the push plate (4).

3. The stacked mold injection mold for a culture dish with a bottom cover matching each other according to claim 1, characterized in that: The side surfaces of the core fixing plate (5), the push plate (4) and the cavity plate (3) are provided with interconnected positioning grooves; a first guide positioning block (16) is connected to the positioning groove of the core fixing plate (5); a second guide positioning block (17) is connected to the positioning groove of the push plate (4); and a third guide positioning block (18) is connected to the positioning groove of the cavity plate (3); the first guide positioning block (16) and the second guide positioning block (17) are provided with groove portions at their rear ends; the second guide positioning block (17) and the third guide positioning block (18) are provided with protrusions inserted into the groove portions at their front ends; the first guide positioning block (16), the second guide positioning block (17) and the third guide positioning block (18) are engaged with each other through the protrusions and the groove portions between the three, so that the three plates, namely the core fixing plate (5), the push plate (4) and the cavity plate (3), are precisely positioned when the mold is closed.

4. The stacked injection mold for a culture dish with a bottom cover matching each other according to claim 1 or 3, characterized in that: It also includes large guide pillars (19), the number of which is four and which are distributed at four corner points. In the mold closing state, one end of the large guide pillar (19) is located in the fixed mold base plate (7), and the other end passes through the core fixing plate (5), the push plate (4), the cavity plate (3), the hot runner fixing plate (2), the hot runner main plate (1), the hot runner fixing plate (2), the cavity plate (3), the push plate (4) and the core fixing plate (5) and is located in the movable mold base plate (6), wherein two large guide pillars (19) located at opposite corners are connected to the movable mold base plate (6) by screws, and the other two large guide pillars (19) located at opposite corners are connected to the fixed mold base plate (7) by screws.

5. The culture dish stack injection mold with a bottom cover matching each other according to claim 1, characterized in that: An assembly guide column (20) is provided between the cavity plate (3), the push plate (4), the core fixing plate (5) and the movable mold base plate (6); the assembly guide column (20) is inserted from a countersunk position on one side of the movable mold base plate (6) and passes through the core fixing plate (5), the push plate (4) and the cavity plate (3) in sequence; guide sleeves are provided in the core fixing plate (5), the push plate (4) and the cavity plate (3) on one side of the movable mold base plate (6) at locations corresponding to the assembly guide column (20); An assembly guide column (20) is provided between the cavity plate (3), the push plate (4), the core fixing plate (5) and the fixed die seat plate (7); the assembly guide column (20) is inserted from a countersunk hole position on one side of the fixed die seat plate (7) and passes through the core fixing plate (5), the push plate (4) and the cavity plate (3) in sequence; and a guide sleeve is provided in the core fixing plate (5), the push plate (4) and the cavity plate (3) on one side of the fixed die seat plate (7) at a position corresponding to the assembly guide column (20).

6. The stacked mold for a culture dish with a bottom cover matching each other according to claim 1, characterized in that: A pre-positioning block (21) is connected to the middle of the lower surface of the hot runner main plate (1) and the hot runner fixing plate (2); a longitudinal bottom supporting beam (22) is arranged below the pre-positioning block (21); sliders (23) are connected to the lower surfaces of both ends of the bottom supporting beam (22); the sliders (23) are mounted on two transverse linear rails (24) on the injection molding machine; a positioning groove (25) is provided on the lower surface of the pre-positioning block (21); the top of the bottom supporting beam (22) is inserted into the positioning groove (25) to play a lateral limiting role.

7. The stacked mold injection mold for a culture dish with a bottom cover matching each other according to claim 1, characterized in that: The top and bottom surfaces of the hot runner main board (1) are both connected to a gear rack (26); a freely rotatable gear (27) is installed in the middle of the gear rack (26); the top and bottom surfaces of the fixed and movable mold base plates (7, 6) are both laterally connected to racks (28); one gear (27) is correspondingly connected to two racks (28); the two racks (28) are respectively located on both sides of the gear (27) and are synchronously meshed with the gear (27); one end of the two racks (28) is connected to the fixed mold base plate (7), and the other end is connected to the movable mold base plate (6); and the remaining suspended length of the rack (28) after passing through the gear rack (26) is greater than the mold opening distance when the mold is opened.

8. The stacked injection mold for a culture dish with a bottom cover matching each other according to claim 7, characterized in that: The upper and lower surfaces of the movable mold base plate (6), the fixed mold base plate (7), the hot runner fixed plate (2) and the cavity plate (3) are all provided with cushion blocks (29) of the same height for the entire mold to be placed flat, and the height of the cushion blocks (29) is higher than the height of the gear rack (26).

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