Open type multi-mold-cavity hot runner system

Abstract

The utility model discloses an open type multi-mold-cavity hot runner system which comprises an upper pan head and a one-way material guide structure detachably installed at the center position in the upper pan head, and a middle material injection pipe is installed at the center position of the bottom end of the upper pan head. A cross-shaped multi-cavity material injection structure used for conveying molten materials in the front, back, left and right directions is installed at the opening position of the end, away from the upper pan head, of the middle material injection pipe, a conical cavity is formed in the middle material injection pipe, and a horn-shaped material receiving nozzle is integrally formed at the top end of the conical cavity. According to the utility model, molten plastic materials generated by an external injection molding machine are fed into the middle injection pipe by utilizing the one-way guide structure, and the middle injection pipe enables the materials to be supplied to each hot nozzle of the multi-mold-cavity hot runner through the cross-shaped multi-cavity injection structure, so that the molten plastic can be uniformly distributed to each hot nozzle; therefore, the feeding time of each hot nozzle is almost the same, and the problem of non-uniform filling caused by feeding time difference is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an open multi-cavity hot runner system. Background Art

[0002] For example, the open multi-cavity hot runner system disclosed in the authorization announcement number CN214773692U includes an upper fixed plate, a lower fixed plate, an injection nozzle, a diverter plate, multiple hot nozzles, heating wires and multiple wiring terminals. The upper fixed plate is arranged at the upper end of the upper fixed plate, and the inner side walls of the upper fixed plate and the lower fixed plate are respectively recessed with a first accommodating groove and a second accommodating groove. The diverter plates are respectively embedded in the first accommodating groove and the second accommodating groove. The hot nozzles are respectively arranged on the lower end wall of the diverter plate, the injection nozzle is arranged on the upper end wall of the diverter plate, and the wiring terminals are arranged on the side walls of the upper fixed plate and the lower fixed plate. The outer peripheral wall of the hot nozzle is provided with a sleeve-type heater. It adopts an open hot runner hot nozzle, has a large glue feeding amount, is easy to install, has no cold material port, and the material The effective utilization rate is high, and there is no need to reuse the old ones. The hot nozzle glue port is extremely small, and the glue outlet is point-shaped, which can effectively increase the shear rate of the plastic melt. However, in the use of the above technical solution, the molten plastic material entering the injection nozzle is directly diverted to each hot nozzle. Since the injection nozzle is at the center position of the top of the upper mold, the hot nozzle far away from the injection nozzle needs to wait for a long time to obtain the molten plastic material, resulting in a large difference in the feeding time of each hot nozzle. That is, the cavity filled earlier may form irregular molding edges or short shots because the plastic begins to cool in the cavity. In the cavity filled last, due to the long waiting time, the plastic may have been partially solidified when entering, resulting in molding defects. In severe cases, normal molding cannot even be achieved. Utility Model Content

[0003] The purpose of the present utility model is to provide an open multi-cavity hot runner system, in which an upper disc head is installed at the center position of the top of the upper mold, and a one-way material guide structure is detachably installed in the upper disc head. The one-way material guide structure feeds the molten plastic material produced by an external injection molding machine into a central injection pipe, and the central injection pipe allows the material to be supplied to each hot nozzle of the multi-cavity hot runner through the cross-shaped multi-cavity injection structure, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an open multi-cavity hot runner system, comprising an upper disc head and a one-way material guide structure detachably installed at the center position inside the upper disc head, a central injection pipe is installed at the center position of the bottom end of the upper disc head, and a cross-shaped multi-cavity injection structure for conveying molten material in four directions of front, back, left and right is installed at the opening position of one end of the central injection pipe away from the upper disc head, a conical cavity is installed inside the central injection pipe, and a trumpet-shaped material receiving nozzle is integrally formed at the top end of the conical cavity, and the trumpet-shaped material receiving nozzle is used to introduce the molten material in the one-way material guide structure into the conical cavity.

[0005] Preferably, an internally threaded steel sleeve is fixed at the center of the top of the upper disc head, and the one-way material guide structure is installed inside the internally threaded steel sleeve.

[0006] Preferably, the one-way material guide structure includes an externally threaded column sleeve threadedly assembled inside the internally threaded steel sleeve, an annular bottom sleeve fixed at the bottom end of the externally threaded column sleeve, and a plugging head elastically installed at one end inside the externally threaded column sleeve. A feed port is provided at the top of the externally threaded column sleeve, and the diameter of the feed port is smaller than the outer diameter of the plugging head.

[0007] Preferably, a coil spring is installed at the center position of the top end of the annular bottom sleeve, and the top end of the coil spring is fixedly connected to the bottom end of the plugging head.

[0008] Preferably, the cross-shaped multi-cavity injection structure includes a hollow cross tube installed at the bottom end of the central injection tube and a vertical injection tube at the top corner of the hollow cross tube for vertically conveying the molten material downward.

[0009] Preferably, the vertical injection pipe includes a solid vertical pipe fixed at the top corner of the hollow cross pipe and a tapered injection pipe installed at the bottom end of the solid vertical pipe, and the top end of the tapered injection pipe is provided with a through hole interconnected with the hollow cross pipe.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: the open multi-cavity hot runner system is provided with a one-way material guide structure, a cross-shaped multi-cavity injection structure and other structures that cooperate with each other. The one-way material guide structure feeds the molten plastic material produced by the external injection molding machine into the central injection pipe, and the central injection pipe allows the material to be supplied to each hot nozzle of the multi-cavity hot runner through the cross-shaped multi-cavity injection structure. It can evenly distribute the molten plastic to each hot nozzle, so that the feeding time of each hot nozzle is almost the same, reducing the problem of uneven filling caused by the difference in feeding time, and shortening the feeding time difference between the hot nozzles, which can ensure that the temperature and flow state of the molten plastic in each cavity are consistent, thereby reducing the appearance defects and structural problems caused by inconsistent cooling time of different cavities. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1This is a schematic diagram of the main structure of the utility model;

[0012] Figure 2 The three-dimensional structural diagram of the utility model is as follows;

[0013] Figure 3 This is a schematic diagram of the three-dimensional structure of the utility model Figure 2 ;

[0014] Figure 4 This is a schematic diagram of the top structure of the utility model;

[0015] Figure 5 It is a schematic diagram of the three-dimensional cross-sectional structure of the utility model.

[0016] In the figure: 1. Upper disk head; 2. Center-mounted injection pipe; 201. Conical cavity; 202. Trumpet-shaped nozzle; 3. Cross-shaped multi-cavity injection structure; 301. Hollow cross tube; 302. Vertical injection pipe; 3021. Solid vertical tube; 3022. Conical-mouth injection pipe; 4. Internally threaded steel sleeve; 5. One-way material guide structure; 501. Externally threaded column sleeve; 502. Annular bottom sleeve; 503. Coil spring; 504. Blocking head; 505. Feed port. DETAILED DESCRIPTION

[0017] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-5 The utility model provides an embodiment of an open multi-cavity hot runner system, comprising an upper disc head 1 and a one-way material guide structure 5 detachably installed at the center position inside the upper disc head 1, a central injection pipe 2 is installed at the center position of the bottom end of the upper disc head 1, and a cross-shaped multi-cavity injection structure 3 for conveying molten material in four directions of front, back, left and right is installed at the opening position of one end of the central injection pipe 2 away from the upper disc head 1, a cone cavity 201 is installed inside the central injection pipe 2, and a trumpet-shaped material receiving nozzle 202 is integrally formed at the top of the cone cavity 201, and the trumpet-shaped material receiving nozzle 202 is used to introduce the molten material in the one-way material guide structure 5 into the cone cavity 201;

[0019] An internally threaded steel sleeve 4 is fixed at the center position of the top of the upper disc head 1, and a one-way material guide structure 5 is installed inside the internally threaded steel sleeve 4. The one-way material guide structure 5 includes an externally threaded column sleeve 501 threadedly assembled inside the internally threaded steel sleeve 4, an annular bottom sleeve 502 fixed at the bottom end of the externally threaded column sleeve 501, and a plugging head 504 elastically installed at one end inside the externally threaded column sleeve 501. A feed port 505 is provided at the top of the externally threaded column sleeve 501. The diameter of the feed port 505 is smaller than the outer diameter of the plugging head 504. A coil spring 503 is installed at the center position of the top of the annular bottom sleeve 502. The top of the coil spring 503 is fixedly connected to the bottom end of the plugging head 504.

[0020] When the molten material enters the one-way material guide structure 5 through the injection molding machine, the molten material flows downward and generates downward pressure on the plugging head 504 and the coil spring 503, so that the plugging head 504 moves downward for a distance, allowing the molten material to enter the interior of the external threaded column sleeve 501 through the feed port 505 and continue to enter the central injection pipe 2 through the annular bottom sleeve 502, which ensures that the molten plastic flows in only one direction, preventing the backflow and retention of the material and enabling it to quickly reach the downstream components; when the feed amount gradually decreases, the elastic force of the coil spring 503 will gradually force the plugging head 504 to move upward until the feed port 505 is blocked;

[0021] The cross-shaped multi-cavity injection structure 3 includes a hollow cross tube 301 installed at the bottom end of the central injection tube 2 and a vertical injection tube 302 at the top corner of the hollow cross tube 301 for vertically conveying molten material downward. The vertical injection tube 302 includes a solid vertical tube 3021 fixed at the top corner of the hollow cross tube 301 and a tapered injection tube 3022 installed at the bottom end of the solid vertical tube 3021. The top of the tapered injection tube 3022 is provided with a through hole interconnected with the hollow cross tube 301. The solid vertical tube 3021 is used to improve the structural strength of the tapered injection tube 3022, so that the tapered injection tube 3022 remains stable in the mold.

[0022] The molten plastic in the conical cavity 201 enters the hollow cross tube 301, so that the molten plastic flows in four directions until the molten plastic flows to the end of the hollow cross tube 301 and enters the conical injection tube 3022. The conical injection tube 3022 feeds the molten material into the hot nozzle of the multi-cavity hot runner to evenly distribute the molten plastic to multiple cavities and reduce the injection time difference between different hot nozzles.

[0023] When the embodiment of the present application is in use, the plastic particles are first fed into the barrel of the injection molding machine through the hopper. Under the action of heating and screw rotation, the plastic particles are heated to a molten state to form molten plastic. At this time, the molten plastic passes through the injection system of the injection machine and is ready to enter the mold. The upper disc head 1 is located at the top of the mold and is responsible for evenly distributing the molten plastic to the one-way material guide structure 5. The structural design of the upper disc head 1 and the one-way material guide structure 5 ensures that the molten plastic can flow smoothly in one direction, reduces material retention and blockage, and prevents the backflow of the molten material during the transportation process. After the one-way material guide structure 5 guides the molten plastic to the center injection tube 2, the center injection tube 2 is responsible for further conveying the molten plastic to the cross-shaped multi-cavity injection structure 3. The design of the center injection tube 2 enables the molten plastic to maintain a certain pressure during the flow process. and temperature to ensure that the material does not cool or become sticky during the subsequent injection process. There is a trumpet-shaped material receiving nozzle 202 between the one-way material guide structure 5 and the central injection tube 2. The design of the trumpet-shaped material receiving nozzle 202 can effectively reduce the flow resistance of the molten plastic when it enters the conical cavity 201, and make the fluid flow more uniform. The conical cavity 201 further concentrates the molten plastic to ensure stable pressure and smooth flow during injection. The molten plastic is then diverted through the cross-shaped multi-cavity injection structure 3 and supplied to each hot nozzle of the multi-cavity hot runner of the mold. Due to the design of the cross-shaped structure, the molten plastic can flow rapidly in four directions of front, back, left and right, ensuring that each hot nozzle in the four directional areas can obtain the same amount of plastic in the same time, reducing the feeding time difference between the hot nozzles, and ensuring the uniformity of the molding process.

Claims

1. Open multi-cavity hot runner system, characterized by: The invention comprises an upper disk head (1) and a one-way material guide structure (5) detachably installed at the center position inside the upper disk head (1); a central injection pipe (2) is installed at the center position of the bottom end of the upper disk head (1); a cross-shaped multi-cavity injection structure (3) for conveying molten material in four directions, front, back, left, and right, is installed at the opening position of one end of the central injection pipe (2) away from the upper disk head (1); a cone cavity (201) is installed inside the central injection pipe (2), and a trumpet-shaped material receiving nozzle (202) is integrally formed at the top end of the cone cavity (201); the trumpet-shaped material receiving nozzle (202) is used to introduce the molten material in the one-way material guide structure (5) into the cone cavity (201).

2. The open multi-cavity hot runner system according to claim 1, characterized in that: An internally threaded steel sleeve (4) is fixed at the center of the top of the upper disc head (1), and the one-way material guide structure (5) is installed inside the internally threaded steel sleeve (4).

3. The open multi-cavity hot runner system according to claim 2, characterized in that: The one-way material guide structure (5) comprises an external threaded column sleeve (501) threadedly assembled inside the internal threaded steel sleeve (4), an annular bottom sleeve (502) fixed at the bottom end of the external threaded column sleeve (501), and a plugging head (504) elastically mounted at one end inside the external threaded column sleeve (501), and a feed port (505) is provided at the top end of the external threaded column sleeve (501), and the diameter of the feed port (505) is smaller than the outer diameter of the plugging head (504).

4. The open multi-cavity hot runner system according to claim 3, characterized in that: A coil spring (503) is installed at the center of the top end of the annular bottom sleeve (502), and the top end of the coil spring (503) is fixedly connected to the bottom end of the plugging head (504).

5. The open multi-cavity hot runner system according to claim 1, characterized in that: The cross-shaped multi-cavity injection structure (3) comprises a hollow cross tube (301) installed at the bottom end of the central injection tube (2) and a vertical injection tube (302) at the top corner of the hollow cross tube (301) for vertically conveying molten material downward.

6. The open multi-cavity hot runner system according to claim 5, characterized in that: The vertical injection pipe (302) comprises a solid vertical pipe (3021) fixed at a corner position at the top end of the hollow cross pipe (301) and a tapered injection pipe (3022) installed at the bottom end of the solid vertical pipe (3021); the top end of the tapered injection pipe (3022) is provided with a through hole that communicates with the hollow cross pipe (301).

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