Injection molding device and processing method of kit

Abstract

The invention relates to the technical field of intelligent manufacturing of kits, and discloses an injection molding device and a processing method of a kit. The injection pressure supply mechanism provides pressure to filter a plastic melt provided by the melt output unit through the melt filter unit to obtain the plastic melt which cannot block a runner in the pressing top mold, so that the circulation effect of the melt is ensured, the melt is injected into each forming cavity from the injection channel, and the forming efficiency is improved. The needed injection molding parts can be subjected to injection molding in the multiple molding cavities after mold closing, so that the molding mold in the injection molding process can be effectively protected through the molding shade, potential safety hazards are reduced, meanwhile, the use amount of plastic melt can be effectively saved through selective pressure supply of the injection pressure supply mechanism, and the production efficiency is improved. And the yield of injection molding parts formed in the forming mold can be effectively ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent manufacturing of reagent kits, and particularly to an injection molding device and a processing method for reagent kits. Background Art

[0002] As an efficient and high-precision plastic processing method, injection molding technology is widely used in fields such as medical devices, consumer electronics, and automotive parts. Its core principle is to melt thermoplastic or thermosetting materials through high temperature and then inject them into the mold cavity under high pressure. After cooling and solidification, products with complex geometric shapes are formed. In the field of medical testing, the manufacturing of precision reagent kits places extremely high requirements on the molding process. For example, structures such as microfluidic chips, reaction chambers, and sample channels need to meet strict indicators such as dimensional accuracy, surface finish, and biocompatibility.

[0003] However, when traditional injection molding devices are dealing with such highly complex products, defects such as sink marks, flash, or internal stress concentration often occur in the products due to problems such as mold design defects, unstable temperature control, or uneven material flow. When manufacturing a microfluidic reagent kit for sperm motility detection, the process of the reagent kit is complex, and it is difficult for conventional processes to achieve complete filling of the structure, thus affecting the accuracy of sperm motility trajectory analysis. In addition, the high melt viscosity characteristics of medical-grade materials further exacerbate the flow resistance, making it difficult to stably control the molding effect of traditional processes.

[0004] Traditional injection molding devices mostly adopt straight-through cold runner or open hot runner designs. When processing high-fill materials or viscous biological materials, shear heat accumulation is likely to occur in the runner, and deposits are easily formed at the runner bends, forcing production to be interrupted for manual cleaning, resulting in a decrease in the production efficiency of the equipment. At the same time, runner blockage will cause fluctuations in injection pressure, resulting in uneven wall thickness and uneven structural thickness of the reagent kit, directly affecting the effectiveness of reagent kit detection. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides an injection molding device and a processing method for reagent kits.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: An injection molding device, comprising an installation base, a molding mask and a melt supply mechanism are respectively arranged at the top end of the installation base, a molding die is arranged inside the molding mask, an injection pressure supply mechanism is arranged on one side of the melt supply mechanism away from the molding mask, and the molding mask can shield and open a communication path between the molding die and the outside of the molding mask; the melt supply mechanism includes a melt output unit, an injection channel and a melt filtration unit, the molding die includes a sliding bottom die and a pressing top die, one end of the injection channel is communicated with the melt output unit through the melt filtration unit, the other end of the injection channel can extend into the pressing top die, and after the sliding bottom die and the pressing top die are clamped, there are a plurality of molding cavities, and a plurality of injection molded parts can be molded inside each molding cavity; only when the molding mask completely shields the molding die and after the sliding bottom die and the pressing top die are clamped, the injection pressure supply mechanism can provide pressure to inject the plastic melt provided by the melt output unit into each molding cavity through the melt filtration unit after filtration.

[0007] Preferably, the injection pressure supply mechanism includes a pressure supply pipe, a pressure supply piston and a hydraulic pressure supply rod, the movable end of the hydraulic pressure supply rod is coaxially fixed with the pressure supply piston, the pressure supply piston is hermetically connected with the inner wall of the pressure supply pipe, one end of the pressure supply pipe is communicated with the injection channel through the melt filtration unit, and the melt output pipe of the melt output unit is communicated with the top end of the pressure supply pipe; when the hydraulic pressure supply rod extends, it can drive the pressure supply piston to first block the communication between the melt output pipe and the injection channel, and then squeeze and inject the plastic melt in the injection channel into each molding cavity; when the hydraulic pressure supply rod shortens, it can generate negative pressure inside the injection channel to suck the excess plastic melt into one end of the injection channel away from the pressing top die.

[0008] Preferably, the melt output unit further includes a raw material storage tank and a heating runner, both ends of the heating runner are respectively communicated with the bottom end of the raw material storage tank and the top end of the melt output pipe; under the action of gravity, the melt raw material particles stored in the raw material storage tank can fall into the heating runner, the melt raw material particles are heated to form plastic melt inside the heating runner, and the plastic melt flows into the melt output pipe under the action of gravity.

[0009] Preferably, the melt filtration unit includes a plurality of melt filtration orifice plates, and along the direction of the injection channel close to the pressing top die, the filtration pore diameters of the melt filtration orifice plates gradually decrease; heating elements are arranged on the inner wall of the injection channel, the inner wall of the pressure supply pipe close to the injection channel, the inner wall of the melt output pipe and inside each melt filtration orifice plate, and the heating elements are used to maintain the fluidity of the passing plastic melt.

[0010] Preferably, the sliding bottom mold includes a plurality of bottom mold cavities which are independent of each other. A plurality of bottom mold grooves are formed inside each bottom mold cavity, and the bottom mold grooves are independent of each other. The bottom mold grooves are used for forming the exposed surface of the injection molded part. The pressing top mold includes a plurality of top mold cavities. A plurality of top mold grooves are formed inside each top mold cavity. The top mold grooves are used for forming the fastening surface of the injection molded part. Each of the top mold cavities can be respectively combined with each of the bottom mold cavities, and at the same time, each of the bottom mold grooves is combined with each of the top mold grooves.

[0011] Preferably, a liquid inlet groove is arranged on one side of the pressing top mold close to the injection channel. After the injection channel extends into the liquid inlet groove, the injection channel is sealed with the inner wall of the liquid inlet groove. A plurality of main liquid injection channels and a plurality of branch liquid injection channels are further arranged inside the pressing top mold. Each main liquid injection channel corresponds to one top mold cavity. One end of each main liquid injection channel is communicated with the liquid inlet groove, and the other end of each main liquid injection channel is communicated with a plurality of branch liquid injection channels.

[0012] Preferably, one end of each branch liquid injection channel far away from the corresponding main liquid injection channel respectively leads to the inner wall of each top mold groove, and the number of branch liquid injection channels communicated with each top mold groove is equal. The opening positions of the branch liquid injection channels communicated with each top mold groove correspond to the positions of the clamping columns of the injection molded part, and the number of clamping columns of each injection molded part is not less than the number of branch liquid injection channels communicated with the corresponding top mold groove.

[0013] Preferably, heating elements are arranged on the inner walls of each main liquid injection channel and each branch liquid injection channel. The heating elements are used to maintain the fluidity of the passing plastic melt. A fusing heating ring is arranged at one end of each branch liquid injection channel close to the top mold groove. The fusing heating ring is used to fuse the connection points between the plastic melt inside each branch liquid injection channel and the plastic parts formed by the bottom mold groove and the top mold groove, and cooperate with the negative pressure provided by the injection pressure supply mechanism to suck the redundant plastic melt back to the injection channel.

[0014] Preferably, a driving and guiding mechanism is further arranged inside the forming mask. The driving and guiding mechanism includes a plurality of guiding and limiting rods, a driving cylinder and a plurality of mold closing buffer rods. Each of the guiding and limiting rods respectively penetrates through the sliding bottom mold and the pressing top mold. The movable end of the driving cylinder is fixed to the sliding bottom mold. Each of the mold closing buffer rods is arranged on one side of the pressing top mold far away from the sliding bottom mold.

[0015] A processing method for a kit uses the above injection molding device to injection mold kit parts, including the following steps: Pre-store a sufficient amount of injection molding raw material particles inside the melt production unit, and heat the injection molding raw material particles into plastic melt through the melt production unit; Completely shield the molding die with the forming mask, drive the sliding bottom die and the pressing top die to close the mold, and under the pressure provided by the injection pressure supply mechanism, filter the plastic melt through the melt filtration unit and inject it into each molding cavity through the injection channel, and mold a batch of kit parts inside each molding cavity; The sliding bottom die and the pressing top die are separated. After removing the injection molded parts from each molding cavity, injection molding of the next batch of kit parts is carried out.

[0016] Compared with the prior art, the present invention provides an injection molding device and a processing method for a kit, having the following beneficial effects: 1. For this injection molding device, after the injection pressure supply mechanism provides pressure to filter the plastic melt provided by the melt production unit through the melt filtration unit, a plastic melt that will not block the flow channel inside the pressing top die is obtained, thereby ensuring the flow effect of the melt, injecting it into each molding cavity through the injection channel, and being able to injection mold the required injection molded parts inside several molding cavities after closing the mold. Thus, the forming mask can effectively protect the molding die during the injection molding process, reduce potential safety hazards, and at the same time, through the selective pressure supply of the injection pressure supply mechanism, effectively save the amount of plastic melt used and effectively ensure the yield of the injection molded parts inside the molding die.

[0017] 2. For this injection molding device, when the injection pressure supply mechanism performs an injection operation, the hydraulic pressure supply rod extends to drive the pressure supply piston to first block the connection between the melt output pipe and the injection channel, thereby preventing the generated driving force from pushing the melt back to the raw material storage tank from the melt output pipe, ensuring the flow direction of the plastic melt and extruding the plastic melt in the injection channel into each molding cavity. During this injection process, through the setting of each melt filtration orifice plate, the filtration aperture diameters of each melt filtration orifice plate decrease in sequence, and can block the incompletely melted plastic raw material particles contained in the melt, preventing the incompletely melted plastic raw material particles from continuing to move along the flow direction of the melt, and being able to avoid the incompletely melted plastic raw material particles from blocking the injection channel and the melt flow channel inside the molding die, and being able to effectively ensure the flow effect of the plastic melt and the molding effect of the injection molded parts inside the molding die.

[0018] 3. This injection molding device is provided with heating elements inside the inner wall of the injection channel, the inner wall of the end of the pressure supply pipe close to the injection channel, the inner wall of the melt output pipe, and inside each melt filter orifice plate. While maintaining the fluidity of the plastic melt inside the flow path, it can also heat and melt the uncompletely melted plastic raw material particles, ensuring the amount of melt supplied to the inside of the molding die and guaranteeing the molding effect of the injection molded part.

[0019] 4. In this injection molding device, each bottom die groove is independent of each other. The bottom die groove is used to form the outer visible surface of the injection molded part, and the top die groove is used to form the engaging surface of the injection molded part. Since the ends of each branch liquid injection flow path far from the corresponding main liquid injection flow path respectively lead to the inner walls of each top die groove, the opening positions of the branch liquid injection flow paths connected to each top die groove correspond to the positions of the clamping posts of the injection molded part, and the number of clamping posts of each injection molded part is not less than the number of branch liquid injection flow paths connected to the corresponding top die groove. It can form the positions of each branch liquid injection flow path corresponding to the positions of the clamping posts of the injection molded part, avoid the gate position from being formed at the outer visible position of the injection molded part, and while effectively molding the injection molded part, guarantee the molding aesthetics of the injection molded part.

[0020] 5. This injection molding device is provided with heating elements inside the inner walls of each main liquid injection flow path and each branch liquid injection flow path to maintain the fluidity of the passing plastic melt. And through the fusing heating rings provided at the ends of each branch liquid injection flow path close to the top die groove, after the injection molding is completed, through the heating of the fusing heating rings, the remaining part of the plastic melt at the contact positions between the formed injection molded part and each branch liquid injection flow path can be kept in a flowing state. It can cooperate with the hydraulic pressure supply rod to shorten the negative pressure generated inside the injection channel, completely extract the extra plastic melt from the inside of the molding die, ensure the separation between the plastic melt and the injection molded part, and improve the demolding effect of the injection molded part and the injection molding efficiency of the injection molded part. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional structural schematic diagram of an injection molding device of the present invention; Figure 2 is a structural schematic diagram of an injection molding device of the present invention with the molding mask removed; Figure 3 is a three-dimensional structural schematic diagram of the melt supply mechanism and the injection pressure supply mechanism of an injection molding device of the present invention; Figure 4 is a cross-sectional schematic diagram of the melt supply mechanism and the injection pressure supply mechanism of an injection molding device of the present invention; Figure 5 is one of the three-dimensional structural schematic diagrams of the molding die and the drive guiding mechanism of an injection molding device of the present invention; Figure 6This is the second three-dimensional structure schematic diagram of the molding die and the driving and guiding mechanism of an injection molding device according to the present invention; Figure 7 This is the partial structure schematic diagram of the pressing and ejecting die of an injection molding device according to the present invention; Figure 8 This is the present invention Figure 7 Enlarged view of part A; Figure 9 This is the internal structure schematic diagram of the pressing and ejecting die of an injection molding device according to the present invention; Figure 10 This is the present invention Figure 9 Enlarged view of part B.

[0022] In the figure: 1, mounting base; 2, molding mask; 3, melt supply mechanism; 31, melt production unit; 311, melt output pipe; 312, raw material storage tank; 313, heating runner; 32, injection channel; 33, melt filtering unit; 331, melt filtering orifice plate; 4, molding die; 41, sliding bottom die; 411, bottom die cavity; 412, bottom die groove; 42, pressing and ejecting die; 421, top die cavity; 422, top die groove; 423, liquid inlet groove; 424, main injection liquid flow channel; 425, branch injection liquid flow channel; 426, fusing heating ring; 5, injection pressure supply mechanism; 51, pressure supply pipe; 52, pressure supply piston; 53, hydraulic pressure supply rod; 6, driving and guiding mechanism; 61, guiding and limiting rod; 62, driving cylinder; 63, mold closing buffer rod. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0024] As introduced in the background art, there are deficiencies in the prior art. To solve the above technical problems, the present application proposes a processing method for an injection molding device and a kit.

[0025] Embodiment 1

[0026] Please refer to Figures 1 - 10, an injection molding device, comprising a mounting base 1, a molding mask 2 and a melt supply mechanism 3 are respectively arranged at the top end of the mounting base 1, a molding die 4 is arranged inside the molding mask 2, and an injection pressure supply mechanism 5 is arranged on the side of the melt supply mechanism 3 away from the molding mask 2. The molding mask 2 can shield and open the communication path between the molding die 4 and the outside of the molding mask 2; the melt supply mechanism 3 includes a melt output unit 31, an injection channel 32 and a melt filtration unit 33, the molding die 4 includes a sliding bottom die 41 and a pressing top die 42. One end of the injection channel 32 is communicated with the melt output unit 31 through the melt filtration unit 33, and the other end of the injection channel 32 can extend into the pressing top die 42. After the sliding bottom die 41 and the pressing top die 42 are closed, there are a number of molding cavities, and a number of injection molded parts can be molded inside each molding cavity; only when the molding mask 2 completely shields the molding die 4 and the sliding bottom die 41 and the pressing top die 42 are closed, the injection pressure supply mechanism 5 can provide pressure to filter the plastic melt provided by the melt output unit 31 through the melt filtration unit 33 and inject it into each molding cavity through the injection channel 32.

[0027] During specific use, first store a sufficient amount of injection molding raw material particles inside the melt output unit 31, and then heat the injection molding raw material particles through the melt output unit 31 to obtain plastic melt (a flowing melt). When performing the injection molding operation, when the molding mask 2 completely shields the molding die 4 and the sliding bottom die 41 and the pressing top die 42 are closed (inductive switches can be arranged inside the molding mask 2 and the molding die 4, and a signal can be output after both are completely closed. After this signal is output, the injection pressure supply mechanism 5 can perform the operation), the injection pressure supply mechanism 5 provides pressure to filter the plastic melt provided by the melt output unit 31 through the melt filtration unit 33 to obtain plastic melt that will not block the flow channels inside the pressing top die 42, thereby ensuring the flow effect of the melt, injecting it into each molding cavity through the injection channel 32, and being able to inject and mold the required injection molded parts inside the several molding cavities after closing the mold. Thus, the molding die 4 during the injection molding process can be effectively protected by the molding mask 2, reducing potential safety hazards. At the same time, through the selective pressure supply of the injection pressure supply mechanism 5, the consumption of plastic melt can be effectively saved, and the yield of the injection molded parts molded inside the molding die 4 can be effectively guaranteed.

[0028] Embodiment Two

[0029] Please refer to Figures 1 - 10, different from the above embodiments, the injection pressure supply mechanism 5 includes a pressure supply pipe 51, a pressure supply piston 52, and a hydraulic pressure supply rod 53. The movable end of the hydraulic pressure supply rod 53 is coaxially fixed to the pressure supply piston 52. The pressure supply piston 52 is sealingly connected to the inner wall of the pressure supply pipe 51. One end of the pressure supply pipe 51 is communicated with the injection channel 32 through the melt filtering unit 33. The melt output pipe 311 of the melt production unit 31 is communicated with the top end of the pressure supply pipe 51. When the hydraulic pressure supply rod 53 extends, it can drive the pressure supply piston 52 to first block the communication between the melt output pipe 311 and the injection channel 32, and then extrude and inject the plastic melt in the injection channel 32 into each molding cavity. When the hydraulic pressure supply rod 53 shortens, it can generate negative pressure inside the injection channel 32 to suck the excess plastic melt into the end of the injection channel 32 away from the pressing top mold 42.

[0030] The melt production unit 31 further includes a raw material storage tank 312 and a heating runner 313. The two ends of the heating runner 313 are respectively communicated with the bottom end of the raw material storage tank 312 and the top end of the melt output pipe 311. Under the action of gravity, the melt raw material particles stored inside the raw material storage tank 312 can fall into the heating runner 313, and the melt raw material particles are heated to form plastic melt inside the heating runner 313. The plastic melt flows into the melt output pipe 311 under the action of gravity.

[0031] The melt filtering unit 33 includes a plurality of melt filtering orifice plates 331. Along the direction of the injection channel 32 close to the pressing top mold 42, the filtering pore diameters of the melt filtering orifice plates 331 gradually decrease. Heating elements are provided on the inner wall of the injection channel 32, the inner wall of the pressure supply pipe 51 close to the injection channel 32, the inner wall of the melt output pipe 311, and inside each melt filtering orifice plate 331. The heating elements are used to maintain the fluidity of the passing plastic melt.

[0032] During use, the molten raw material particles stored inside the raw material storage tank 312 fall into the heating runner 313 under the action of gravity, and the molten raw material particles inside the heating runner 313 are heated to form a plastic melt. The plastic melt flows into the melt output pipe 311 under the action of gravity and continues to flow into the injection channel 32 to gradually fill the injection channel 32. When the injection pressure supply mechanism 5 performs an injection operation, the hydraulic pressure supply rod 53 extends to drive the pressure supply piston 52 to first block the connection between the melt output pipe 311 and the injection channel 32, thereby preventing the generated driving force from pushing the melt to return from the melt output pipe 311 to the raw material storage tank 312, ensuring the flow direction of the plastic melt, and squeezing the plastic melt in the injection channel 32 into each molding cavity. During this injection process, through the setting of each melt filter orifice plate 331, the filter pore diameters of each melt filter orifice plate 331 gradually decrease, so as to block the incompletely melted plastic raw material particles contained in the melt, prevent the incompletely melted plastic raw material particles from continuing to move along the flow direction of the melt, and avoid the incompletely melted plastic raw material particles from blocking the melt flow channels inside the injection channel 32 and the molding die 4, effectively ensuring the flow effect of the plastic melt and the molding effect of the injection molded parts inside the molding die 4. Heating elements are provided on the inner wall of the injection channel 32, the inner wall of the pressure supply pipe 51 near the injection channel 32, the inner wall of the melt output pipe 311, and inside each melt filter orifice plate 331. While maintaining the fluidity of the plastic melt inside the flow path, it can also heat and melt the incompletely melted plastic raw material particles, ensuring the amount of melt provided to the inside of the molding die 4 and guaranteeing the molding effect of the injection molded parts.

[0033] After the injection molding is completed, the hydraulic pressure supply rod 53 shortens to generate a negative pressure inside the injection channel 32, sucking the excess plastic melt into the end of the injection channel 32 away from the pressing top die 42, and being able to extract the extra plastic melt from the inside of the molding die 4 (the injection molded parts after the molding die 4 is molded do not have fluidity), ensuring the separation between the plastic melt and the injection molded parts, improving the demolding effect of the injection molded parts, and improving the injection molding efficiency of the injection molded parts.

[0034] Embodiment III

[0035] Please refer to Figures 1 - 10, different from the above embodiments, the sliding bottom mold 41 includes a plurality of bottom mold cavities 411 which are independent of each other. A plurality of bottom mold grooves 412 are formed inside each bottom mold cavity 411, and the bottom mold grooves 412 are independent of each other. The bottom mold grooves 412 are used for forming the exposed surface of the injection molded part; the pressing top mold 42 includes a plurality of top mold cavities 421. A plurality of top mold grooves 422 are formed inside each top mold cavity 421, and the top mold grooves 422 are used for forming the engaging surface of the injection molded part; each top mold cavity 421 can be respectively closed with each bottom mold cavity 411, and at the same time, each bottom mold groove 412 is closed with each top mold groove 422.

[0036] A liquid inlet groove 423 is arranged on one side of the pressing top mold 42 close to the injection channel 32. After the injection channel 32 extends into the liquid inlet groove 423, the injection channel 32 is sealed with the inner wall of the liquid inlet groove 423; a plurality of main liquid injection channels 424 and a plurality of branch liquid injection channels 425 are further arranged inside the pressing top mold 42. Each main liquid injection channel 424 corresponds to one top mold cavity 421. One end of each main liquid injection channel 424 is communicated with the liquid inlet groove 423, and the other end of each main liquid injection channel 424 is communicated with a plurality of branch liquid injection channels 425.

[0037] One end of each branch liquid injection channel 425 far from the corresponding main liquid injection channel 424 respectively leads to the inner wall of each top mold groove 422, and the number of branch liquid injection channels 425 communicated with each top mold groove 422 is equal; the opening positions of the branch liquid injection channels 425 communicated with each top mold groove 422 correspond to the positions of the clamping columns of the injection molded part, and the number of clamping columns of each injection molded part is not less than the number of branch liquid injection channels 425 communicated with the corresponding top mold groove 422.

[0038] Heating elements are arranged on the inner walls of each main liquid injection channel 424 and each branch liquid injection channel 425, and the heating elements are used to maintain the fluidity of the plastic melt passing through; a fusing heating ring 426 is arranged at one end of each branch liquid injection channel 425 close to the top mold groove 422. The fusing heating ring 426 is used to fuse the connection points between the plastic melt inside each branch liquid injection channel 425 and the plastic parts formed by the bottom mold groove 412 and the top mold groove 422, and cooperate with the negative pressure provided by the injection pressure supply mechanism 5 to suck the redundant plastic melt back to the injection channel 32.

[0039] In specific use, each bottom mold groove 412 is independent of each other. The bottom mold groove 412 is used to form the exposed surface of the injection molded part, and the top mold groove 422 is used to form the engaging surface of the injection molded part. Since the ends of each branch liquid injection runner 425 far from the corresponding main liquid injection runner 424 respectively lead to the inner walls of each top mold groove 422, the opening positions of the branch liquid injection runners 425 connected to each top mold groove 422 correspond to the positions of the clamping posts of the injection molded part. The number of clamping posts of each injection molded part is not less than the number of branch liquid injection runners 425 connected to the corresponding top mold groove 422, so that the positions formed by each branch liquid injection runner 425 can correspond to the positions of the clamping posts of the injection molded part, avoiding the sprue position from being formed at the exposed position of the injection molded part, and effectively forming the injection molded part while ensuring the molding aesthetics of the injection molded part.

[0040] In specific use, heating elements are arranged on the inner walls of each main liquid injection runner 424 and each branch liquid injection runner 425 to maintain the fluidity of the passing plastic melt. And a fusing heating ring 426 is arranged at one end of each branch liquid injection runner 425 close to the top mold groove 422. After the injection molding is completed, through the heating of the fusing heating ring 426, the remaining part of the plastic melt at the contact position between the formed injection molded part and each branch liquid injection runner 425 can be kept in a flowing state. And by cooperating with the hydraulic pressure rod 53 to shorten the negative pressure generated inside the injection channel 32, the extra plastic melt can be completely extracted from the inside of the molding die 4 to ensure the separation between the plastic melt and the injection molded part, thereby improving the demolding effect of the injection molded part and the injection molding efficiency of the injection molded part.

[0041] A driving and guiding mechanism 6 is further arranged inside the molding mask 2. The driving and guiding mechanism 6 includes a plurality of guiding and limiting rods 61, a driving cylinder 62 and a plurality of mold closing buffer rods 63; each guiding and limiting rod 61 respectively penetrates through the sliding bottom mold 41 and the pressing top mold 42, the movable end of the driving cylinder 62 is fixed to the sliding bottom mold 41, and each mold closing buffer rod 63 is arranged on the side of the pressing top mold 42 far from the sliding bottom mold 41.

[0042] In use, the sliding directions of the sliding bottom mold 41 and the pressing top mold 42 are restricted by each guiding and limiting rod 61, and the collision intensity during the mold closing process of the sliding bottom mold 41 and the pressing top mold 42 is reduced by each mold closing buffer rod 63 to ensure the mold closing effect of the sliding bottom mold 41 and the pressing top mold 42.

[0043] Example 4

[0044] A processing method of a kit, which uses the injection molding device described in any one of Examples 1 - 3 to injection mold and produce kit parts, includes the following steps: Pre-store a sufficient amount of injection molding raw material particles inside the melt production unit 31, and heat the injection molding raw material particles into a plastic melt through the melt production unit 31; Completely shield the molding die 4 through the molding mask 2, drive the sliding bottom die 41 and the pressing top die 42 to close the mold, and filter the plastic melt through the melt filtration unit 33 under the pressure provided by the injection pressure supply mechanism 5, and inject it into each molding cavity through the injection channel 32, and mold a batch of kit parts inside each molding cavity; The sliding bottom die 41 and the pressing top die 42 are separated, and after the injection molded parts are removed from each molding cavity, the injection molding of the kit parts in the next batch is carried out.

[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An injection molding device, comprising a mounting base, wherein a molding mask and a melt supply mechanism are respectively arranged at the top end of the mounting base, and it is characterized in that: Inside the forming mask, a forming mold is provided. On one side of the melt supply mechanism away from the forming mask, an injection pressure supply mechanism is provided. The forming mask can shield and open the communication path between the forming mold and the outside of the forming mask. The melt supply mechanism includes a melt production unit, an injection channel, and a melt filtration unit. The forming mold includes a sliding bottom mold and a pressing top mold. One end of the injection channel communicates with the melt production unit through the melt filtration unit, and the other end of the injection channel can extend into the inside of the pressing top mold. After the sliding bottom mold and the pressing top mold are closed, there are several forming cavities, and several injection molded parts can be formed inside each forming cavity. Only when the forming mask completely shields the forming mold and the sliding bottom mold and the pressing top mold are closed, the injection pressure supply mechanism can provide pressure to inject the plastic melt provided by the melt production unit into each forming cavity after being filtered by the melt filtration unit through the injection channel.

2. An injection molding device according to claim 1, characterized in that: The injection pressure supply mechanism includes a pressure supply pipe, a pressure supply piston, and a hydraulic pressure supply rod. The movable end of the hydraulic pressure supply rod is coaxially fixed to the pressure supply piston. The pressure supply piston is sealingly connected to the inner wall of the pressure supply pipe. One end of the pressure supply pipe communicates with the injection channel through the melt filtration unit, and the melt output pipe of the melt production unit communicates with the top end of the pressure supply pipe. When the hydraulic pressure supply rod extends, it can drive the pressure supply piston to first block the communication between the melt output pipe and the injection channel, and then squeeze and inject the plastic melt in the injection channel into each forming cavity. When the hydraulic pressure supply rod shortens, it can generate negative pressure inside the injection channel to suck the excess plastic melt into one end of the injection channel away from the pressing top mold.

3. An injection molding device according to claim 2, characterized in that: The melt production unit further includes a raw material storage tank and a heating runner. The two ends of the heating runner communicate with the bottom end of the raw material storage tank and the top end of the melt output pipe respectively. Under the action of gravity, the melt raw material particles stored inside the raw material storage tank can fall into the heating runner, and the melt raw material particles are heated to form plastic melt inside the heating runner. The plastic melt flows into the melt output pipe under the action of gravity.

4. An injection molding device according to claim 3, characterized in that: The melt filtration unit includes several melt filtration orifice plates. Along the direction of the injection channel close to the pressing top mold, the filtration pore diameters of each melt filtration orifice plate decrease in sequence. Heating elements are provided on the inner wall of the injection channel, the inner wall of the pressure supply pipe close to the injection channel, the inner wall of the melt output pipe, and inside each melt filtration orifice plate. The heating elements are used to maintain the fluidity of the passing plastic melt.

5. An injection molding device according to claim 1, characterized in that: The sliding bottom mold includes several bottom mold cavities, and each bottom mold cavity is independent of each other. Several bottom mold grooves are opened inside each bottom mold cavity, and each bottom mold groove is independent of each other. The bottom mold grooves are used to form the external appearance surface of the injection molded part. The pressing top mold includes several top mold cavities, and several top mold grooves are opened inside each top mold cavity. The top mold grooves are used to form the fastening surface of the injection molded part. Each of the top mold cavities can be clamped with each of the bottom mold cavities respectively, and at the same time, each of the bottom mold grooves is clamped with each of the top mold grooves.

6. The injection molding device according to claim 5, characterized in that: A liquid inlet groove is provided on one side of the pressing top mold close to the injection channel. After the injection channel extends into the interior of the liquid inlet groove, the injection channel is sealed with the inner wall of the liquid inlet groove. A number of main liquid injection channels and a number of branch liquid injection channels are further provided inside the pressing top mold. Each of the main liquid injection channels corresponds to one of the top mold cavities. One end of each main liquid injection channel is communicated with the liquid inlet groove, and the other end of each main liquid injection channel is communicated with a number of the branch liquid injection channels.

7. An injection molding device according to claim 6, characterized in that: One end of each of the branch liquid injection channels away from the corresponding main liquid injection channel leads to the inner wall of each of the top mold grooves respectively, and the number of the branch liquid injection channels communicated with each top mold groove is equal. The opening positions of the branch liquid injection channels communicated with each top mold groove correspond to the positions of the clamping posts of the injection molded part, and the number of the clamping posts of each injection molded part is not less than the number of the branch liquid injection channels communicated with the corresponding top mold groove.

8. An injection molding device according to claim 7, characterized in that: Heating elements are provided on the inner walls of each of the main liquid injection channels and each of the branch liquid injection channels. The heating elements are used to maintain the fluidity of the plastic melt passing through. A fusing heating ring is provided at one end of each of the branch liquid injection channels close to the top mold groove. The fusing heating ring is used to fuse the connection points between the plastic melt inside each of the branch liquid injection channels and the plastic parts formed by the bottom mold groove and the top mold groove, and cooperate with the negative pressure provided by the injection pressure supply mechanism to suck the excess plastic melt back to the injection channel.

9. An injection molding device according to claim 1, characterized in that: A driving and guiding mechanism is further provided inside the forming mask. The driving and guiding mechanism includes a number of guiding and limiting rods, a driving cylinder and a number of mold clamping buffer rods. Each of the guiding and limiting rods penetrates through the sliding bottom mold and the pressing top mold respectively. The movable end of the driving cylinder is fixed to the sliding bottom mold, and each of the mold clamping buffer rods is arranged on the side of the pressing top mold away from the sliding bottom mold.

10. A processing method of a kit, characterized in that, Using an injection molding device as described in any one of claims 1-9 to injection mold kit parts, includes the following steps: Pre-storing a sufficient amount of injection molding raw material particles inside the melt production unit, and heating the injection molding raw material particles into plastic melt by the melt production unit. Completely shielding the molding die by the forming mask, driving the sliding bottom mold and the pressing top mold to be clamped together, filtering the plastic melt through the melt filtering unit by the pressure provided by the injection pressure supply mechanism, and injecting the plastic melt into each forming cavity through the injection channel, and forming a batch of kit parts inside each forming cavity. The sliding bottom mold and the pressing top mold are separated, and after the injection molded parts are removed from each forming cavity, the injection molding of the next batch of kit parts is carried out.

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