A mold facilitating injection molding of a multi-cavity mold

Abstract

The application discloses a mold convenient for injection molding of a multi-hole mold, and belongs to the technical field of molds. The mold comprises, from top to bottom, an upper mold assembly, a middle mold assembly and a lower mold assembly. The centers of the upper mold assembly and the middle mold assembly are correspondingly provided with an injection molding channel. The lower mold assembly is provided with a liquid storage cavity corresponding to the injection molding channel. The inner side of the middle mold assembly is provided with a plurality of mold cavities in communication with the liquid storage cavity. A scraper rod assembly, an upper mold core and a lower mold core are coaxially arranged on the inner side of the middle mold assembly from top to bottom and correspond to the mold cavities. A core rod is arranged on the inner side of the upper mold assembly. The middle part of the core rod is in sliding fit with the center hole of the scraper rod assembly. The lower end of the core rod extends into the lower mold core after passing through the upper mold core. A scraper head is arranged on the lower end of the scraper rod assembly. The mold cavities are formed between the core rod, the scraper head, the upper mold core and the center hole walls of the lower mold core. The mold can reduce the problem that a single hole is easily blocked, thereby improving the precision of products and prolonging the service life of the device.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of molds, and particularly relates to a mold facilitating injection molding of a multi-cavity mold. BACKGROUND

[0002] Unlike traditional single-cavity or few-cavity molds, a multi-cavity mold is designed to contain multiple independent cavity spaces, the entrances of which are connected to the flow channels of the injection molding system. Just like a honeycomb board, the small cells in the honeycomb are similar to the cavities of the mold, and the plastic melt will be injected into these cells to form individual plastic products after cooling and solidification. The presence of multiple cavities allows the injection molding machine to produce multiple identical or different specifications of plastic products simultaneously in one complete injection molding cycle. Compared with traditional single-cavity molds, the efficiency of injection molding production is greatly improved, especially suitable for large-scale production of plastic products with large demand and relatively fixed specifications. If the plastic raw material used for injection molding contains impurities, such as water vapor formed by insufficiently dried moisture, dust particles mixed in, or foreign matter generated by contamination of the raw material during storage and transportation, the melt flowing through the flow channel into the cavity is prone to block a single hole. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a mold facilitating injection molding of a multi-cavity mold, which can reduce the problem of single holes being easily blocked, thereby improving the precision of the product and increasing the service life of the device.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0005] The mold disclosed by the present application facilitates injection molding of a multi-cavity mold, which comprises an upper mold assembly, a middle mold assembly, and a lower mold assembly arranged in sequence from top to bottom, the centers of the upper mold assembly and the middle mold assembly correspondingly form an injection molding channel, the lower mold assembly is provided with a liquid storage cavity corresponding to the injection molding channel, and the inner side of the middle mold assembly is formed with a plurality of cavity spaces in communication with the liquid storage cavity; a scraper rod assembly, an upper mold core, and a lower mold core are coaxially arranged in sequence on the inner side of the middle mold assembly corresponding to the cavity spaces from top to bottom, a core rod is installed on the inner side of the upper mold assembly, the middle part of the core rod is slidingly fitted with the center hole of the scraper rod assembly, the lower end of the core rod extends into the lower mold core after passing through the upper mold core, a scraper head is installed at the lower end of the scraper rod assembly, and the cavity spaces are formed between the center hole walls of the core rod, the scraper head, the upper mold core, and the lower mold core; the outer peripheral wall of the scraper head is matched with the inner wall of the upper mold core.

[0006] Further, the scraper rod assembly comprises an upper scraper rod, a sleeve, a lower scraper rod, a first spring, a rack, a gear and a gear brake, the upper end of the upper scraper rod is slidingly installed on the upper mold assembly, the lower end of the upper scraper rod is threadedly connected with the upper end of the sleeve, the upper end of the lower scraper rod is threadedly connected with the lower end of the sleeve, the screw rotation directions of the upper scraper rod and the lower scraper rod are opposite, the upper scraper rod and the lower scraper rod are connected through the first spring, the outer side of the sleeve is fixed with the rack, the rack is engaged with the gear, and the gear is connected with the gear brake; the upper scraper rods of two adjacent scraper rod assemblies are connected with a push rod assembly, and the scraper head is installed on the lower scraper rod.

[0007] Further, the push rod assembly comprises a push rod, a pressure sensor and a second spring, the push rod is provided with a limiting hole corresponding to the upper scraper rod, the pressure sensor is installed between the upper scraper rod and the push rod, and the second spring is installed between the upper scraper rod and the upper mold assembly.

[0008] Further, the upper mold assembly and the middle mold assembly are spaced apart to form an operation cavity, and at least part of the upper scraper rod is located in the operation cavity.

[0009] Further, the lower end of the lower scraper rod is integrally formed with at least two scraper heads on the outer side, and a containing groove is formed between two adjacent scraper heads.

[0010] Further, the lower end of the lower end of the lower mold core is detachably installed with an inner mold core, and the center of the inner mold core is formed with a liquid inlet communicated with the cavity.

[0011] Further, the core rod is threadedly connected with the upper mold assembly, and the depth of the core rod extending into the lower mold core can be adjusted by rotating the core rod.

[0012] Further, the outer side of the upper mold core is provided with a first heating wire, and the center of the core rod is provided with a second heating wire.

[0013] Further, the inner side of the middle mold assembly is provided with a cooling channel, and the cooling channel is adjacent to the upper mold core.

[0014] The beneficial effects of the present application are as follows:

[0015] The mold disclosed by the present application is convenient for multi-hole mold injection, when the inner wall of the cavity is blocked by cooled injection material or impurities, the scraper rod assembly arranged above the cavity can be moved vertically to scrape off the impurities, the problem that a single hole is easily blocked can be reduced, the precision of products is improved, and the service life of the device is prolonged.

[0016] The mold discloses a mold, the cavity is formed by the combination of the upper mold core and the lower mold core, the inner wall of the upper mold core is smooth, the material of the upper mold core is different from that of the middle mold assembly, the cost is saved, the inner wall of the upper mold core is closer to the scraper head, the residual of the injection material is reduced, and the production precision of the product is improved.

[0017] Other advantages, objects, and features of the present application will be apparent to those skilled in the art from the following specification, and it is intended to cover any alternatives, modifications, or equivalents included within the scope of the present application. The present application can be better understood by reference to the following description. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to make the objects, technical solutions and beneficial effects of the present application clearer, the present application provides the following drawings for description:

[0019] Figure 1 The structure of the mold of the present application is shown in the figure;

[0020] Figure 2 The structure of the scraper rod assembly of the present application is shown in the figure;

[0021] Figure 3 The structure of the scraper rod assembly of the present application is shown in the figure; Figure 2 The enlarged view at A;

[0022] Figure 4 The enlarged view at B; Figure 2 The enlarged view at B;

[0023] Figure 5 The enlarged view at C. Figure 2 The enlarged view at C.

[0024] In the drawings, the following marks are used: upper mold assembly 1, middle mold assembly 2, lower mold assembly 3, injection channel 4, liquid storage cavity 5, cavity 6, scraper rod assembly 7, upper mold core 8, lower mold core 9, core rod 10, scraper head 11, upper scraper rod 12, sleeve 13, lower scraper rod 14, first spring 15, rack 16, gear 17, gear brake 18, push rod 19, pressure sensor 20, second spring 21, operation cavity 22, containing groove 23, inner mold core 24, liquid inlet 25, first heating wire 26, second heating wire 27, cooling channel 28. DETAILED DESCRIPTION

[0025] As Figures 1-5As shown, the mold for facilitating injection molding of a multi-hole mold disclosed by the application comprises an upper mold assembly 1, a middle mold assembly 2 and a lower mold assembly 3 arranged in sequence from top to bottom, the upper mold assembly 1 is stacked by multiple plates, which can facilitate mold removal and impurity cleaning. A support rod is installed between the upper mold assembly 1 and the middle mold assembly 2, and the operation cavity 22 is supported by the support rod. Unlike the middle mold assembly 2 and the lower mold assembly 3, the upper mold assembly 1 is far away from the cavity 6, so it does not need to bear too much heat, and therefore a relatively inexpensive material can be used.

[0026] The center of the upper mold assembly 1 and the middle mold assembly 2 corresponds to form an injection channel 4, the upper end of the injection channel 4 forms an injection port for adding injection material, the lower mold assembly 3 is provided with a liquid storage cavity 5 corresponding to the injection channel 4, and the inner side of the middle mold assembly 2 is formed with a plurality of cavities 6 communicating with the liquid storage cavity 5; the injection material enters the liquid storage cavity 5 through the injection channel 4, and then flows into each cavity 6 through the internal flow channel.

[0027] In some other embodiments, the upper mold assembly 1 and the middle mold assembly 2 are correspondingly provided with two groups, which are symmetrically arranged on the upper and lower sides of the lower mold assembly 3, and the two groups of liquid storage cavities 5 provided on the lower mold assembly 3 correspond to the two groups of middle mold assemblies 2, which can adapt to more injection molding work of the cavities 6 and improve the injection molding efficiency.

[0028] Corresponding to the cavity 6, a scraper assembly 7, an upper mold core 8 and a lower mold core 9 are coaxially arranged in sequence from top to bottom on the inner side of the middle mold assembly 2, the scraper assembly 7 is in the shape of a long cylinder, the upper mold core 8 and the lower mold core 9 are both in the shape of a cylinder, a core rod 10 is installed on the inner side of the upper mold assembly 1, the middle part of the core rod 10 is in sliding fit with the center hole of the scraper assembly 7, the lower end of the core rod 10 extends into the lower mold core 9 after passing through the upper mold core 8, a scraper head 11 is installed at the lower end of the scraper assembly 7, and the center hole wall of the core rod 10, the scraper head 11, the upper mold core 8 and the lower mold core 9 forms the cavity 6; the outer peripheral wall of the scraper head 11 cooperates with the inner wall of the upper mold core 8. By arranging the scraper assembly 7 above the cavity 6, when the scraper assembly 7 moves vertically, impurities can be removed, reducing the problem of easy blockage of single holes.

[0029] In the embodiment, the scraper assembly 7 comprises an upper scraper 12, a sleeve 13, a lower scraper 14, a first spring 15, a rack 16, a gear 17 and a gear brake 18, the upper end of the upper scraper 12 forms a head, which can be used to limit the downward movement of the scraper assembly 7, the upper end of the upper scraper 12 is slidingly installed on the upper mold assembly 1, the lower end of the upper scraper 12 is threadedly connected with the upper end of the sleeve 13, the upper end of the lower scraper 14 is threadedly connected with the lower end of the sleeve 13, the threads of the upper scraper 12 and the lower scraper 14 are opposite in direction, the upper scraper 12 and the lower scraper 14 are connected through the first spring 15, the first spring 15 is used to provide an elastic pre-tension to drive the upper scraper 12 and the lower scraper to return to the original position, the outer side of the sleeve 13 is fixed with the rack 16, the rack 16 is engaged with the gear 17, the gear 17 is connected with the gear brake 18, the upper scrapers 12 of two adjacent scraper assemblies 7 are connected through a push rod 19 assembly, and the scraper head 11 is installed on the lower scraper 14.

[0030] In the device, the scraper assembly 7 is arranged, under the action of its own gravity and the pre-tension of the second spring 21, to increase the pre-tension of the product, ensure the quality of the product and reduce the generation of bubbles.

[0031] In the embodiment, the push rod 19 assembly comprises a push rod 19, a pressure sensor 20 and a second spring 21, the push rod 19 is provided with a limiting hole corresponding to each upper scraper 12, the pressure sensor 20 is installed between the upper scraper 12 and the push rod 19, and the second spring 21 is installed between the upper scraper 12 and the upper mold assembly 1. The gear brake 18 comprises a brake motor

[0032] The working principle and process of the device are as follows:

[0033] 1. When there is no blockage, the injection liquid below pushes the scraper assembly 7 to move upward, each upper scraper 12 drives the push rod 19 to move upward synchronously, the pressure sensor 20 is not stressed, and under the action of its own friction and the spring tension, the two shafts and the threaded sleeve 13 will not move relatively, the brake motor of the control gear 17 is not loaded, and will not hinder the gear 17.

[0034] 2. When there is blockage, the upper scraper 12 of the single-hole blockage does not move, the other normally moving upper scrapers 12 act on the upper scraper 12 that does not move, the pressure sensor 20 is stressed and sends a signal, the controller controls the gear brake 18 to brake the gear 17, the rack 16 does not move, and the upper scraper 12 and the lower scraper 14 move in opposite directions, when the upper scraper 12 moves upward under the drive of the push rod 19, the lower scraper 14 moves downward to scrape off impurities.

[0035] In the embodiment, the upper die assembly 1 and the middle die assembly 2 are spaced apart to form an operation cavity 22, and the upper scraping rod 12 is at least partially located in the operation cavity 22. By arranging the operation cavity 22, manual operation of the upper scraping rod 12 can be realized, and the use is more stable.

[0036] In the embodiment, the lower end of the lower scraping rod 14 is integrally formed with at least two scraping heads 11, and a containing groove 23 is formed between the adjacent two scraping heads 11. By arranging the containing groove 23, impurities can be contained to prevent the impurities from affecting the product quality. The plurality of scraping heads 11 can also make the cleaning of the inner wall of the injection molding more thorough.

[0037] In the embodiment, the lower end of the lower scraping rod 14 is integrally formed with at least two scraping heads 11, and a containing groove 23 is formed between the adjacent two scraping heads 11. By arranging the containing groove 23, impurities can be contained to prevent the impurities from affecting the product quality. The plurality of scraping heads 11 can also make the cleaning of the inner wall of the injection molding more thorough.

[0038] In the embodiment, the core rod 10 is threadedly connected with the upper die assembly 1, and by rotating the core rod 10, the depth of the core rod 10 extending into the lower die core 9 can be adjusted, and the thickness of the lower end of the cavity 6 can be controlled.

[0039] In the embodiment, the outer side of the upper die core 8 is provided with a first heating wire 26, and the center of the core rod 10 is provided with a second heating wire 27. By combining the two heating wires inside and outside, the problem of blockage caused by too fast cooling of a single hole can be avoided. The inner side of the middle die assembly 2 is provided with a cooling channel 28 adjacent to the upper die core 8, so that the temperature can be controlled.

[0040] Finally, it should be pointed out that the above preferred embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application.

Claims

1. A mold facilitating injection molding of a multiwell mold, characterized by: The injection molding machine comprises an upper mold assembly, a middle mold assembly and a lower mold assembly arranged in sequence from top to bottom, a center of the upper mold assembly and the middle mold assembly correspondingly forms an injection channel, the lower mold assembly is provided with a liquid storage cavity corresponding to the injection channel, the inner side of the middle mold assembly is formed with a plurality of mold cavities in communication with the liquid storage cavity; a scraper rod assembly, an upper mold core and a lower mold core are coaxially arranged in sequence on the inner side of the middle mold assembly from top to bottom corresponding to the mold cavities, a core rod is installed on the inner side of the upper mold assembly, the middle part of the core rod is slidingly matched with the center hole of the scraper rod assembly, the lower end of the core rod extends into the lower mold core after passing through the upper mold core, a scraper head is installed on the lower end of the scraper rod assembly, the center hole walls of the core rod, the scraper head, the upper mold core and the lower mold core form the mold cavities; the outer peripheral wall of the scraper head is matched with the inner wall of the upper mold core, the scraper rod assembly comprises an upper scraper rod, a sleeve, a lower scraper rod, a first spring, a rack, a gear and a gear brake, the upper end of the upper scraper rod is slidingly installed on the upper mold assembly, the lower end of the upper scraper rod is threadedly connected with the upper end of the sleeve, the upper end of the lower scraper rod is threadedly connected with the lower end of the sleeve, the screw rotation directions of the upper scraper rod and the lower scraper rod are opposite, the upper scraper rod and the lower scraper rod are connected through the first spring, the rack is fixed on the outer side of the sleeve, the rack is engaged with the gear, the gear is connected with the gear brake; the upper scraper rods of two adjacent scraper rod assemblies are connected with a push rod assembly, and the scraper head is installed on the lower scraper rod.

2. A mold for facilitating injection molding of a multi-well mold according to claim 1, wherein: The push rod assembly comprises a push rod, a pressure sensor and a second spring, the push rod is provided with a limiting hole corresponding to the upper scraper rod, the pressure sensor is installed between the upper scraper rod and the push rod, and the second spring is installed between the upper scraper rod and the upper mold assembly.

3. A mold for facilitating injection molding of a multi-well mold according to claim 2, wherein: The upper scraper rod is at least partially located in an operation cavity formed between the upper mold assembly and the middle mold assembly.

4. A mold for facilitating injection molding of a multi-well mold according to claim 3, wherein: The lower end of the lower scraper rod is integrally formed with at least two scraper heads, and a containing groove is formed between the adjacent two scraper heads.

5. A mold for facilitating injection molding of a multi-well mold according to claim 4, wherein: The lower end of the lower mold core is detachably installed with an inner mold core, and the center of the inner mold core is formed with a liquid inlet in communication with the mold cavities.

6. A mold for facilitating injection molding of a multi-well mold according to claim 5, wherein: The core rod is threadedly connected with the upper mold assembly, and the depth of the core rod extending into the lower mold core can be adjusted by rotating the core rod.

7. A mold for facilitating injection molding of a multi-well mold according to any one of claims 1-6, wherein: The outer side of the upper mold core is provided with a first heating wire, and the center of the core rod is provided with a second heating wire.

8. A mold for facilitating injection molding of a multi-well mold according to claim 7, wherein: The inner side of the middle mold assembly is provided with a cooling channel, and the cooling channel is adjacent to the upper mold core.

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