Multi-acupoint suction head injection molding mold

Abstract

The utility model relates to a kind of multi-acupoint suction head injection molding mould, including mould body, hot filling unit and injection unit being installed in mould body;Mould body from top to bottom sequentially includes upper support plate, injection cavity plate, injection guide plate, injection part upper fixed plate, injection part upper guide plate, injection part lower guide plate, injection part lower fixed plate and lower support plate being stacked and installed together;Injection unit includes several injection parts, and injection part from top to bottom sequentially includes injection upper feed pipe, injection upper pipeline and injection lower pipeline.The utility model is through the shunt design of 8 hot filling flow guide tubes and 8 injection parts per pipe, realizes 64 acupoints synchronous processing, single cycle time is shortened, compared with prior art efficiency greatly improves, meets large-scale batch production demand.

Description

Technical Field

[0001] This utility model relates to the technical field of medical product mold processing, and in particular to a multi-acupoint suction head injection molding mold. Background Technology

[0002] Pipe tips are mostly disposable consumables used in any molecular biology and genetics research application. They effectively form a protective structure between the pipette and the sample, ensuring the safety of sample aspiration and dispensing. Pipe tips are also frequently used as medical devices, and existing medical pipette tips are generally injection molded using a two-color mold, with the main body made of rigid plastic material.

[0003] In existing technologies, the processing mold, from top to bottom, includes a heat insulation plate, an upper fixed base, a hot runner plate, a fixed mold pad, and a mother mold plate, etc. (the suction head is formed through the fixed mold assembly, and the hot filling guide tube assists in the return of raw materials). Although this can meet the basic suction head processing requirements, it has the following significant shortcomings in actual mass production: Limited number of acupoints to be processed and low production efficiency: The fixed mold components in the existing technology are generally a decentralized design of a single pipe + a single cavity. The number of suction heads that can be processed by a single mold is only a single number. Moreover, there is no centralized flow distribution structure between the fixed mold components, which makes it impossible to realize the synchronous processing of multiple acupoints from a single source and multiple flow, and it is difficult to meet the efficiency requirements of large-scale production.

[0004] Poor mold assembly precision and insufficient molding stability: Existing technologies generally use only a single-specification guide post to position each layer plate, and the locking frame is only installed at two locations: the hot runner plate and the moving mold support plate, and the fixed mold pad plate and the moving mold support plate. During injection molding, the wall thickness of the suction head is prone to deviation due to cavity misalignment, which does not meet the precision requirements of medical-grade suction heads.

[0005] In view of the above-mentioned shortcomings, the designer actively researched and innovated in order to create a multi-cavity suction head injection molding mold, which 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 a multi-cavity suction head injection molding mold.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A multi-cavity suction head injection molding mold includes a mold body, a hot water filling unit and an injection molding unit installed inside the mold body; The mold body, from top to bottom, includes an upper support plate, an injection cavity plate, an injection guide plate, an upper fixing plate for the injection part, an upper guide plate for the injection part, a lower guide plate for the injection part, a lower fixing plate for the injection part, and a lower support plate, all stacked together. The hot irrigation unit includes a hot irrigation body, a hot irrigation nozzle installed at the top center of the hot irrigation body, and several hot irrigation guide pipes installed at the bottom of the hot irrigation body. The injection unit includes several injection parts, which, from top to bottom, include an upper injection feed pipe, an upper injection pipe, and a lower injection pipe. The lower injection pipe is installed inside the injection support pipe, and an injection support frame is installed on the top of the injection support pipe. The hot water nozzle is installed in the middle of the upper support plate. The hot water body is located in the hot water receiving cavity opened on the top inner side of the injection molding cavity plate. The hot water guide pipe is connected to the injection lower pipe of several injection parts through multiple connecting pipes. The injection upper feed pipe is located in the upper fixed plate of the injection part. The injection upper pipe and the injection lower pipe are both located in the upper guide plate of the injection part. The injection support frame and the injection support pipe are both located in the lower guide plate of the injection part. The bottom of the injection support pipe is installed on the lower fixed plate of the injection part below.

[0008] As a further improvement of this utility model, a number of injection support rods are installed at the bottom of the injection support frame, and the bottom of the injection support rods is installed on the lower fixing plate of the injection molded part below.

[0009] As a further improvement of this utility model, the upper support plate, injection cavity plate, injection guide plate, upper fixing plate of injection molded part, upper guide plate of injection molded part and lower guide plate of injection molded part are installed together after being guided by a number of first mounting guide posts.

[0010] As a further improvement of this utility model, the upper fixing plate, upper guide plate, lower guide plate, lower fixing plate and lower support plate of the injection molded part are installed together after being guided by a number of second mounting guide posts.

[0011] As a further improvement of this utility model, the number of hot water diversion tubes is eight, and the bottom of any one of the hot water diversion tubes is connected to the injection pipes of eight injection molded parts through a multi-way connecting pipe.

[0012] As a further improvement of this utility model, the portion of the multi-connecting pipe located in the injection molding lower pipe is mounted on the injection molding support frame.

[0013] As a further improvement of this utility model, a locking frame is installed between the injection molding guide plate, the upper fixing plate of the injection molding part, the upper guide plate of the injection molding part, the lower guide plate of the injection molding part, and the lower fixing plate of the injection molding part.

[0014] As a further improvement of this utility model, both the upper support plate and the injection molding cavity plate are heat-insulating materials.

[0015] By means of the above solution, this utility model has at least the following advantages: This invention utilizes a diversion design with 8 hot water diversion tubes and 8 injection molded parts per tube to achieve simultaneous processing of 64 acupoints, shortening the single cycle time and greatly improving efficiency compared to existing technologies, thus meeting the needs of large-scale mass production.

[0016] This utility model adopts a design with double-set guide columns and multi-position locking frame, which reduces the coaxiality error of the mold, improves the product qualification rate, and meets the precision requirements of medical grade.

[0017] This utility model's hot water diversion pipe is equipped with a heat tracing device (to prevent raw material clumping), and multiple interconnected pipes shorten the return path. With the help of negative pressure assisted return, the raw material utilization rate is increased, saving raw materials.

[0018] 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

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the structure of a multi-cavity suction head injection molding die according to the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure after removing the upper support plate; Figure 3 yes Figure 1 A schematic diagram of the structure after removing the injection molding cavity plate; Figure 4 yes Figure 1 A schematic diagram of the structure after removing the injection molding guide plate; Figure 5 yes Figure 1 A schematic diagram of the structure after removing the fixing plate from the plastic part; Figure 6 yes Figure 1 A schematic diagram of the structure after removing the guide plate from the injection molded part; Figure 7 yes Figure 1 A schematic diagram of the structure after removing the lower guide plate of the injection molded part; Figure 8 yes Figure 1 A schematic diagram of the structure after removing the lower fixing plate of the injection molded part; Figure 9 yes Figure 8 Schematic diagram of the structure of the heat pump unit and the injection molding unit; Figure 10 yes Figure 9 Schematic diagram of the middle injection molding unit; Figure 11 yes Figure 10 A schematic diagram of the structure of one of the injection molded parts.

[0021] The meanings of the labels in the figures are as follows.

[0022] 1. Upper support plate; 2. Injection cavity plate; 3. Injection guide plate; 4. Upper fixing plate of injection molded part; 5. Upper guide plate of injection molded part; 6. Lower guide plate of injection molded part; 7. Lower fixing plate of injection molded part; 8. Lower support plate; 9. Hot filling cavity; 10. Hot filling body; 11. Hot filling nozzle; 12. Hot filling guide tube; 13. First mounting guide post; 14. Injection molded part; 15. Second mounting guide post; 16. Multi-way connecting pipe; 17. Upper feed pipe of injection molded part; 18. Upper pipe of injection molded part; 19. Lower pipe of injection molded part; 20. Injection support frame; 21. Injection support tube; 22. Injection support rod. Detailed Implementation

[0023] The specific embodiments of this utility model will be further described in 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 the scope of this utility model.

[0024] 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.

[0025] The first embodiment of this utility model: like Figures 1-11 As shown, this embodiment of a multi-cavity suction head injection molding mold includes a mold body, a hot water filling unit and an injection molding unit installed in the mold body.

[0026] 1. Mold body: The mold body, from top to bottom, includes an upper support plate 1, an injection cavity plate 2, an injection guide plate 3, an upper fixing plate for the injection part 4, an upper guide plate for the injection part 5, a lower guide plate for the injection part 6, a lower fixing plate for the injection part 7, and a lower support plate 8, all stacked together.

[0027] The upper support plate 1, injection cavity plate 2, injection guide plate 3, upper fixing plate 4 of injection part, upper guide plate 5 of injection part, and lower guide plate 6 of injection part are installed together after being guided by several first mounting guide posts 13.

[0028] The upper fixing plate 4, upper guide plate 5, lower guide plate 6, lower fixing plate 7, and lower support plate 8 of the injection molded part are installed together after being guided by several second mounting guide posts 15.

[0029] Both the upper support plate 1 and the injection molding cavity plate 2 are heat-insulating materials (alumina ceramic heat-insulating materials (heat insulation coefficient ≤0.1W / (m·K)) to prevent heat loss when the molten raw material flows through).

[0030] A locking frame is installed between the injection guide plate 3, the upper fixing plate 4 of the injection part, the upper guide plate 5 of the injection part, the lower guide plate 6 of the injection part, and the lower fixing plate 7 of the injection part to ensure that each layer of plate fits tightly without loosening.

[0031] 2. Heat injection unit: The hot irrigation unit includes a hot irrigation body 10, a hot irrigation nozzle 11 installed at the top center of the hot irrigation body 10, and several hot irrigation guide pipes 12 installed at the bottom of the hot irrigation body 10.

[0032] The hot water nozzle 11 (made of heat-resistant alloy) is installed in the middle of the upper support plate 1, and its top is sealed to the raw material delivery pipe of the injection molding machine (the sealing gasket is made of fluororubber and is heat-resistant to 250°C or higher). The hot water body 10 (with built-in electric heating wire heating device, power 100W, temperature control accuracy ±2℃) is located in the hot water receiving cavity 9 opened on the top inner side of the injection molded cavity plate 2 (the receiving cavity volume is 500mL, and the inner wall is polished with Ra≤0.4μm). Eight hot water guide tubes 12 (temperature resistant PPS material) are evenly distributed at the bottom of the hot water body 10. Each hot water guide tube 12 is wrapped with an electric heating wire heat tracing layer (power 50W / tube, temperature control 190±5℃). The top is connected to the hot water body 10, and the bottom is connected to the injection molding unit through a multi-way connecting pipe 16.

[0033] 3. Injection Molding Unit: The injection unit includes several injection molded parts 14. The injection molded parts 14 include, from top to bottom, an upper injection feed pipe 17, an upper injection pipe 18, and a lower injection pipe 19. The lower injection pipe 19 is installed inside the injection support pipe 21, and an injection support frame 20 is installed on the top of the injection support pipe 21.

[0034] The upper feed pipe 17 of the injection molding part is located inside the upper fixing plate 4 of the injection molding part. Its top is connected to the upper pipe 18 of the injection molding part, and its bottom corresponds to the suction port cavity of the suction head. Both the upper injection pipe 18 and the lower injection pipe 19 are located inside the upper guide plate 5 of the injection molded part. They are coaxially connected and together form the main cavity of the suction head. The injection-molded lower pipe 19 is installed inside the injection-molded support pipe 21 (stainless steel material), and the top of the injection-molded support pipe 21 is welded with an injection-molded support frame 20 (ABS material, with pipe slots). Four injection support rods 22 (made of 304 stainless steel) are welded to the bottom of the injection support frame 20. The bottom of the support rods is fixed to the lower fixing plate 7 of the injection part by threaded connection. One end of the multi-way connecting pipe 16 (temperature resistant PPSU material) is sealed to the bottom of the hot water diversion pipe 12, and the other end branches into 8 interfaces, which are respectively connected to the injection lower pipes 19 of the 8 injection molded parts 14. The connection section between the multi-way connecting pipe 16 and the injection lower pipe 19 is fixed in the slot of the injection support frame 20 by a buckle (the buckle gap is 0.1mm to prevent the pipe from shaking).

[0035] The component's mounting structure includes: The hot water nozzle 11 is installed in the middle of the upper support plate 1. The hot water body 10 is located in the hot water receiving cavity 9 opened on the top inner side of the injection molding cavity plate 2. The hot water guide pipe 12 is connected to the injection lower pipe 19 of several injection molded parts 14 through the multi-way connecting pipe 16. The injection upper feed pipe 17 is located in the upper fixing plate 4 of the injection molded part. The injection upper pipe 18 and the injection lower pipe 19 are both located in the upper guide plate 5 of the injection molded part. The injection support frame 20 and the injection support pipe 21 are both located in the lower guide plate 6 of the injection molded part. The bottom of the injection support pipe 21 is installed on the lower fixing plate 7 of the injection molded part below.

[0036] Several injection support rods 22 are installed at the bottom of the injection support frame 20, and the bottom of the injection support rods 22 is installed on the lower fixing plate 7 of the injection part below.

[0037] There are eight hot water inlet pipes 12, and the bottom of any one of the hot water inlet pipes 12 is connected to the injection lower pipes 19 of the eight injection molded parts 14 respectively through a multi-way connecting pipe 16. The portion of the multi-way connecting pipe 16 located on the injection lower pipe 19 is mounted on the injection support frame 20.

[0038] The second embodiment of this utility model: A brief description of the working process of this embodiment: The working process of the multi-cavity suction head injection molding mold in this embodiment is divided into 5 stages, as follows: 1. Mold pre-assembly stage The lower support plate 8 is horizontally fixed on the worktable of the injection molding machine (flatness ≤ 0.02mm). The lower fixing plate 7, the lower guide plate 6, the upper guide plate 5, and the upper fixing plate 4 of the injection molded part are sequentially installed through the second installation guide post 15, ensuring that the gap between the guide hole and the guide post of each plate is ≤ 0.02mm. Install the injection support tube 21 inside the lower guide plate 6 of the injection molded part, fix the injection support frame 20 and the injection support rod 22, and make the lower injection pipe 19 coaxially pass into the injection support tube 21. The injection guide plate 3, injection cavity plate 2, and upper support plate 1 are sequentially inserted through the first installation guide post 13. The hot filling body 10 is placed into the hot filling cavity 9 of the injection cavity plate 2. The hot filling nozzle 11 passes through the upper support plate 1 and is sealed and connected to the raw material pipe of the injection molding machine. Install 6 locking brackets, tighten the M8 bolts, and complete the overall assembly of the mold. At this point, the coaxiality error of the mold is ≤0.03mm.

[0039] 2. Raw material preheating and injection stage Start the temperature control system of the injection molding machine and the mold, raise the temperature of the hot water body 10 to 190°C, the temperature of the heat tracing layer of the hot water guide pipe 12 to 185°C, and the temperature of the injection cavity area (upper injection pipe 18 and lower injection pipe 19) to 170°C, and keep it warm for 10 minutes. The molten medical-grade PP raw material (melt index 15g / 10min, temperature 195℃) is injected into the hot filling cavity 9 through the hot filling nozzle 11. The raw material injection volume is 300mL (to meet the injection requirements of 64 suction heads in a single operation).

[0040] 3. Multi-point diversion injection molding stage Under the action of 0.8MPa injection pressure, the raw material in the hot water body 10 flows evenly into 8 hot water guide tubes 12, and the flow rate of the raw material in each guide tube is controlled by a solenoid valve to be 37.5mL. The raw material flows into the multi-way connecting pipe 16 through the hot water diversion pipe 12, and is simultaneously distributed to the injection pipe 19 of the eight injection parts 14 through the eight branch interfaces; The raw material flows upward along the lower injection pipe 19, successively filling the upper injection pipe 18 and the upper injection feed pipe 17, and finally filling the entire suction head cavity. The injection holding time is 3 seconds (holding pressure 0.5 MPa).

[0041] 4. Excess raw material recirculation stage After the injection molding pressure holding is completed, the micro negative pressure pump (negative pressure value -0.02MPa) at the top of the hot water body 10 is started. The excess material (about 15mL) that has not completely entered the cavity flows back to the hot water receiving cavity 9 through the multi-way connecting pipe 16 and the hot water guide pipe 12. During the reflux process, the heat tracing layer of the hot water diversion pipe 12 is kept at 185°C to prevent the raw materials from solidifying and clumping. The reflux time is ≤2s, and the raw material utilization rate can reach more than 95%.

[0042] 5. Cooling and demolding stage Start the cooling water circuit in the mold (cooling water temperature 25℃, flow rate 10L / min) to cool the injection cavity for 6 seconds, so that the suction head temperature drops from 170℃ to below 60℃; Turn off the temperature control system and negative pressure pump, remove the 6 locking brackets, and separate the upper support plate 1, injection cavity plate 2, and injection guide plate 3 in sequence along the first and second installation guide columns; Start the ejection mechanism of the lower fixing plate 7 of the injection molded part (ejection force 500N) to eject 64 molding suction heads simultaneously and complete one processing cycle.

[0043] 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.

[0044] 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.

[0045] 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 multi-cavity suction head injection molding mold, comprising a mold body, a hot water filling unit and an injection molding unit installed within the mold body; Its features are: The mold body, from top to bottom, includes an upper support plate (1), an injection cavity plate (2), an injection guide plate (3), an upper fixing plate for injection molded parts (4), an upper guide plate for injection molded parts (5), a lower guide plate for injection molded parts (6), a lower fixing plate for injection molded parts (7), and a lower support plate (8). The hot water unit includes a hot water body (10), a hot water nozzle (11) installed at the top center of the hot water body (10), and several hot water guide pipes (12) installed at the bottom of the hot water body (10). The injection unit includes several injection parts (14). The injection parts (14) include an upper injection feed pipe (17), an upper injection pipe (18), and a lower injection pipe (19) from top to bottom. The lower injection pipe (19) is installed inside the injection support pipe (21), and an injection support frame (20) is installed on the top of the injection support pipe (21). The hot water nozzle (11) is installed in the middle of the upper support plate (1). The hot water body (10) is located in the hot water receiving cavity (9) opened on the inner side of the top of the injection molding cavity plate (2). The hot water guide pipe (12) is connected to the injection lower pipe (19) of several injection molded parts (14) through a multi-way connecting pipe (16). The injection upper feed pipe (17) is located in the upper fixing plate (4) of the injection molded part. The injection upper pipe (18) and the injection lower pipe (19) are both located in the upper guide plate (5) of the injection molded part. The injection support frame (20) and the injection support pipe (21) are both located in the lower guide plate (6) of the injection molded part. The bottom of the injection support pipe (21) is installed on the lower fixing plate (7) of the injection molded part below.

2. The multi-cavity suction head injection molding die as described in claim 1, characterized in that, Several injection support rods (22) are installed at the bottom of the injection support frame (20), and the bottom of the injection support rods (22) is installed on the lower fixing plate (7) of the injection part below.

3. The multi-cavity suction head injection molding die as described in claim 1, characterized in that, The upper support plate (1), injection cavity plate (2), injection guide plate (3), upper fixing plate (4), upper guide plate (5) and lower guide plate (6) of the injection part are installed together after being guided by a number of first mounting guide posts (13).

4. The multi-cavity suction head injection molding die as described in claim 1, characterized in that, The upper fixing plate (4), upper guide plate (5), lower guide plate (6), lower fixing plate (7), and lower support plate (8) of the injection molded part are installed together after being guided by a number of second mounting guide posts (15).

5. The multi-cavity suction head injection molding die as described in claim 1, characterized in that, The number of hot water diversion pipes (12) is eight, and the bottom of any one of the hot water diversion pipes (12) is connected to the injection lower pipes (19) of eight injection molded parts (14) respectively through a multi-way connecting pipe (16).

6. The multi-cavity suction head injection molding die as described in claim 5, characterized in that, The portion of the multi-connecting pipe (16) located in the injection molding lower pipe (19) is mounted on the injection molding support frame (20).

7. The injection molding mold for a multi-cavity suction head as described in claim 1, characterized in that, A locking bracket is installed between the injection guide plate (3), the upper fixing plate (4) of the injection part, the upper guide plate (5) of the injection part, the lower guide plate (6) of the injection part and the lower fixing plate (7) of the injection part.

8. The injection molding mold for a multi-cavity suction head as described in claim 1, characterized in that, Both the upper support plate (1) and the injection molded cavity plate (2) are heat-insulating materials.

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