Injection nozzle assembly, injection molding machine

Abstract

The present invention specifically relates to an injection nozzle assembly and an injection molding machine. The injection nozzle assembly, the injection nozzle and a plurality of injection nozzle heads. The plurality of injection nozzle heads include an injection inlet, a plurality of first flow channels respectively connected to the injection inlet; the plurality of injection nozzle heads are respectively fixed to the bottom of the injection nozzle along the axial direction of the aforementioned first flow channels, and the plurality of injection nozzle heads respectively include a second flow channel connected to the aforementioned first flow channel and a gate connected to the second flow channel. The present invention provides an injection inlet formed by the injection nozzle, a plurality of first flow channels respectively connected to the injection inlet, and a second flow channel formed by the injection nozzle head, so that the injection nozzle assembly can be configured with multiple gates in a small installation space to meet the injection requirements of injection machines that are small in size, require multiple gates, and have a close distance between adjacent gates. The products injected by the injection nozzle assembly on a small molding machine have the advantages of good injection molding effect, beautiful gates, and high product yield.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds, in particular to an injection nozzle assembly and an injection molding machine. Background Art

[0002] Injection molding machine (abbreviated as injection machine or injection molding machine) is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting materials.

[0003] Currently, the injection mechanism used by injection molding machines for injecting thermoplastics typically consists of an injection inlet and a corresponding nozzle. For small, precision products requiring high injection accuracy, such as small, precision medical devices, existing injection mechanisms cannot meet these precision requirements. They also cannot meet the injection requirements of injection machines with small installation volumes and close gate distances. Products injected using existing injection mechanisms in small molding machines suffer from poor injection quality, unsightly gates, and low product yields. Therefore, it is necessary to develop an injection nozzle assembly and injection molding machine to address these issues. Summary of the Invention

[0004] The present invention aims to provide an injection nozzle assembly with good injection molding effect, beautiful gate and high product yield.

[0005] In order to achieve the above objectives, one embodiment of the present invention provides an injection nozzle assembly, comprising:

[0006] An injection nozzle, comprising an injection inlet and a plurality of first flow channels respectively connected to the injection inlet;

[0007] A plurality of injection nozzle heads are respectively fixed to the bottom of the injection nozzle along the axial direction of the aforementioned first flow channel, and the plurality of injection nozzle heads respectively include a second flow channel connected to the aforementioned first flow channel and a gate connected to the second flow channel.

[0008] As a further improvement of one embodiment of the present invention, it also includes a driving cylinder mounted on the outer wall of the injection nozzle and a plurality of valve needles extending from the aforementioned first flow channel to the second flow channel, wherein the driving cylinder drives the plurality of aforementioned valve needles to perform linear reciprocating motion simultaneously, and the valve needles are configured to open or close the corresponding gates.

[0009] As a further improvement of one embodiment of the present invention, the driving cylinder includes a cylinder body and a piston arranged in the cylinder body, and the cylinder body and the piston jointly define a through cavity for installing the injection nozzle, wherein the outer wall of the injection nozzle is adapted to match the inner wall of the through cavity, and the injection nozzle also includes a positioning and mounting portion for positioning and mounting the cylinder body in a vertical direction.

[0010] As a further improvement of one embodiment of the present invention, the piston includes a movable part movably arranged up and down on the inner wall of the cylinder body, and a connecting part formed by axially extending the movable part and fixedly installed with the valve needle, wherein the connecting part is arranged parallel to the top wall of the cylinder body.

[0011] As a further improvement of one embodiment of the present invention, the injection nozzle includes a first injection nozzle body extending downward from the top of the cylinder body, and a second injection nozzle body fixed to the bottom of the first injection nozzle body along the axial direction of the first injection nozzle body. The top surface of the first injection nozzle body is provided with the injection inlet, and the first injection nozzle body and the second injection nozzle body jointly define a plurality of the aforementioned first flow channels.

[0012] As a further improvement of one embodiment of the present invention, the positioning and mounting portion includes a first limiting boss portion extending outward from the first injection nozzle body to form a limiting abutment against the inner top wall of the cylinder body, and a second limiting boss portion extending outward from the second injection nozzle body to form a limiting abutment against the inner bottom wall of the cylinder body, wherein the second injection nozzle body is arranged below the connecting portion and extends out of the through cavity, and a movable space for the connecting portion to move up and down is defined between the first injection nozzle body and the second injection nozzle body.

[0013] As a further improvement of one embodiment of the present invention, the cylinder body includes a top cover, a cylinder sleeve, and a base from top to bottom; wherein, the top cover, the cylinder sleeve, and the base jointly define the aforementioned through cavity, the top cover forms the aforementioned first limiting boss portion, and the base forms the aforementioned second limiting boss portion.

[0014] As a further improvement of one embodiment of the present invention, the center line of the injection inlet coincides with the center line of the through cavity, and the plurality of first flow channels are arranged in a circular array with the center line of the through cavity as the midline axis.

[0015] As a further improvement of one embodiment of the present invention, the plurality of injection nozzle heads are respectively threadedly connected to the bottom of the injection nozzle, wherein the bottom of the injection nozzle is recessed upward to form a thread groove threadedly connected to the injection nozzle head.

[0016] In order to solve the above problems, the present invention also provides an injection molding machine with good injection molding effect, beautiful gate and high product yield.

[0017] An injection molding machine comprises the injection nozzle assembly as described above.

[0018] Compared with the prior art, the present invention has the following advantages: the injection nozzle assembly and injection molding machine provided by the present invention utilize an injection nozzle and multiple nozzle tips connected to the bottom of the injection nozzle to complete the pouring process of molten plastic. Furthermore, the injection inlet formed by the injection nozzle, multiple first flow channels connected to the injection inlet, and second flow channels formed by the nozzle tip allow the injection nozzle assembly to be configured with multiple gates within a small installation space, thereby meeting the injection requirements of injection molding machines that are small in size, require multiple gates, and have close distances between adjacent gates. The products injected by the injection nozzle assembly on small molding machines have the advantages of good injection molding effect, beautiful gates, and high product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of the injection nozzle assembly of the present invention;

[0020] Figure 2 Schematic diagram of the structure of the injection nozzle assembly of the present invention when viewed from above;

[0021] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure in the AA direction;

[0022] Figure 4 This is a schematic diagram of the structure of the injection nozzle assembly of the present invention when viewed from above;

[0023] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure in the BB direction;

[0024] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure in the CC direction.

[0025] In the figure: 1. Injection nozzle; 11. Injection inlet; 12. First flow channel; 13. First injection nozzle body; 14. Second injection nozzle body; 15. Active space; 16. Positioning and mounting portion; 161. First limiting boss portion; 162. Second limiting boss portion; 17. Threaded groove; 2. Injection nozzle head; 21. Second flow channel; 22. Gate; 3. Valve needle; 4. Driving cylinder; 41. Cylinder body; 411. Top cover; 412. Cylinder sleeve; 413. Base; 42. Piston; 421. Active portion; 422. Connecting portion; 43. Through-hole; 51. First heating element; 52. Second heating element. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0027] Combine Figure 1 As shown, the present invention primarily relates to an injection nozzle assembly comprising an injection nozzle 1 and a plurality of nozzle tips 2 connected to the bottom of the injection nozzle 1. There are at least two nozzle tips 2. By heating and temperature-controlling the injection plastic, the molten plastic is sequentially poured through the injection nozzle 1 and the nozzle tips 2 into the mold cavity of the mold assembly.

[0028] Combine Figures 2 to 5 As shown, in this embodiment, the injection nozzle 1 includes an injection inlet 11 and multiple first runners 12 respectively connected to the injection inlet 11. Multiple injection nozzle heads 2 are fixed to the bottom of the injection nozzle 1 along the axial direction of the first runner 12. The multiple injection nozzle heads 2 respectively include a second runner 21 connected to the first runner 12 and a gate 22 connected to the second runner 21. The injection nozzle head 2 is arranged at the bottom of the injection nozzle 1, and the second runner 21 is coaxial with the bottom of the first runner 12.

[0029] The number of the injection nozzles 2 is the same as the number of the first runners 12 , and each injection nozzle 2 has a second runner 21 and a gate 22 disposed at the bottom of the second runner 21 . The number of the second runners 21 is the same as the number of the first runners 12 .

[0030] Among them, the molten plastic flows in from the injection inlet 11, flows into multiple first runners 12 respectively, and then flows out through the second runners 21 and gates 22 corresponding to the first runners 12 respectively, and is poured into the cavity of the mold assembly at the same time to meet the injection requirements of the injection molding machine with a small volume, multiple gates, and a close distance between adjacent gates.

[0031] Furthermore, the gate 22 can be selectively opened or closed. Preferably, multiple gates 22 are opened or closed simultaneously.

[0032] Furthermore, the injection nozzle assembly further includes a driving cylinder 4 sleeved on the outer wall of the injection nozzle 1, and a plurality of valve needles 3 extending from the first flow channel 12 to the second flow channel 21. The valve needles 3 can move up and down to open or close the valve needles 3.

[0033] The driving cylinder 4 drives multiple valve needles 3 to simultaneously perform linear reciprocating motion, thereby simultaneously opening or closing multiple gates 22. The valve needles 3 are configured to open or close their corresponding gates 22. This solves the problem of small injection molding machines being unable to simultaneously control the opening and closing of multiple gates using valve needles, making the injection process more controllable, with higher injection precision and better injection results.

[0034] Furthermore, the driving cylinder 4 includes a cylinder body 41 and a piston 42 disposed within the cylinder body 41. The cylinder body 41 and the piston 42 together define a through-hole 43 for mounting the injection nozzle 1. The through-hole 43 is vertically extending, and the injection nozzle 1 extends downward from the injection inlet 11 and is disposed within the through-hole 43.

[0035] Furthermore, the outer wall of the injection nozzle 1 is adapted to fit within the inner wall of the through-hole 43. The injection nozzle 1 also includes a positioning and mounting portion 16 for vertically positioning and mounting the cylinder body 41. The injection nozzle 1 passes through the through-hole 43 and is positioned and mounted on the cylinder body 41 via the positioning and mounting portion 16, thereby improving the stability of the connection between the injection nozzle 1 and the cylinder body 41.

[0036] The piston 42 further comprises a movable portion 421 that is movably mounted on the inner wall of the cylinder body 41, and a connecting portion 422 that extends axially from the movable portion 421 and is fixedly mounted to the valve needle 3. The connecting portion 422 is arranged parallel to the top wall of the cylinder body 41. The upper and lower portions of the inner wall of the cylinder body 41 are respectively provided with movable stoppers that engage with the movable portion 421. The movable portion 421 and the connecting portion 422 move up and down together, driving the valve needle 3 in this upward and downward motion.

[0037] Furthermore, the injection nozzle 1 includes a first injection nozzle body 13 extending downward from the top of the cylinder body 41 and a second injection nozzle body 14 fixed to the bottom of the first injection nozzle body 13 along the axial direction of the first injection nozzle body 13 .

[0038] The injection inlet 11 is provided in the middle of the top surface of the first nozzle body 13. The first nozzle body 13 and the second nozzle body 14 together define a plurality of first flow channels 12. The first nozzle body 13 forms a portion of the first flow channels 12, and the second nozzle body 14 forms another portion of the first flow channels 12. The other portion of the first flow channels 12 is coaxially arranged with the second flow channels 21.

[0039] To provide space for the connection portion 422, a portion of the first flow channel 12 extends downward from the injection inlet 11 at an angle from the center. Another portion of the first flow channel 12 extends vertically downward to ensure smooth downward flow of the molten plastic.

[0040] Preferably, the first nozzle body 13 is threadedly connected to the top of the second nozzle body 14 through the connecting portion 422 .

[0041] Furthermore, the second nozzle body 14 is disposed below the connecting portion 422 and extends out of the through cavity 43 . A movable space 15 for the connecting portion 422 to move up and down is defined between the first nozzle body 13 and the second nozzle body 14 .

[0042] Specifically, when the piston 42 moves downward until the lower surface of the connecting portion 422 contacts the top surface of the second injection nozzle body 14, the gate 22 is in a closed state;

[0043] When the piston 42 moves upward until the lower surface of the connecting portion 422 is away from the top end surface of the second injection nozzle body 14 , the gate 22 is in an open state.

[0044] Preferably, the height of the first injection nozzle body 13 in the axial direction is smaller than the height of the second injection nozzle body 14 in the axial direction.

[0045] Furthermore, the positioning and mounting portion 16 includes a first limiting boss portion 161 extending outward from the first injection nozzle body 13 to form a limiting abutment against the inner top wall of the cylinder body 41, and a second limiting boss portion 162 extending outward from the second injection nozzle body 14 to form a limiting abutment against the inner bottom wall of the cylinder body 41.

[0046] Furthermore, the cylinder body 41 includes, from top to bottom, a top cover 411, a cylinder sleeve 412, and a base 413. The top cover 411 is connected to the top opening of the cylinder sleeve 412, and the base 413 is connected to the bottom opening of the cylinder sleeve 412. The top cover 411, the cylinder sleeve 412, and the base 413 collectively define a through cavity 43 with upper and lower openings.

[0047] Furthermore, the top cover 411 and the first limiting boss portion 161 are positioned in a limiting manner, and the base 413 and the second limiting boss portion 162 are positioned in a limiting manner.

[0048] Furthermore, the center line of the injection inlet 11 coincides with the center line of the through-cavity 43, and the plurality of first flow channels 12 are arranged in a circular array with the center line of the through-cavity 43 as the centerline axis, so that the distance between the injection inlet 11 and the plurality of first flow channels 12 is the same, and the molten plastic can be poured into the cavity of the mold assembly at the same time.

[0049] Furthermore, multiple nozzle tips 2 are threadedly connected to the bottom of the injection nozzle 1. The bottom of the injection nozzle 1 is recessed upward to form a thread groove 17 that is threadedly connected to the nozzle tips 2. This threaded connection allows different nozzle tips 2 to be installed in conjunction with the injection nozzle 1, thereby meeting the installation requirements of different injection machines.

[0050] Combine Figure 6As shown, the injection nozzle 1 also includes a first heating element 51 spirally mounted on the outer wall of the first nozzle body 13 and a second heating element 52 spirally mounted on the outer wall of the second nozzle body 14. The first heating element 51 and the second heating element 52 are used together to heat the molten plastic in the first flow channel 12 to ensure smooth flow of the molten plastic. The first heating element 51 is mounted on the inner side of the cylinder body 41. The second heating element 52 is partially mounted on the inner side of the cylinder body 41, and the other part of the second heating element 52 extends out of the cylinder body 41.

[0051] In order to solve the above problems, the present invention also provides an injection molding machine.

[0052] An injection molding machine comprises the injection nozzle assembly as described above.

[0053] Compared to the prior art, the injection nozzle assembly and injection molding machine provided by the present invention utilize an injection nozzle 1 and multiple injection nozzle heads 2 connected to the bottom of the injection nozzle 1 to complete the pouring process of molten plastic. Furthermore, the injection inlet 11 formed by the injection nozzle 1, multiple first flow channels 12 respectively connected to the injection inlet 11, and the second flow channel 21 formed by the injection nozzle head 2 enable the injection nozzle assembly to be configured with multiple gates 22 within a small installation space, thereby meeting the injection requirements of injection molding machines that are small in size, require multiple gates, and have a close distance between adjacent gates. The products injected by the injection nozzle assembly on small molding machines have the advantages of good injection molding effect, beautiful gates 22, and high product yield.

[0054] In this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance, unless otherwise expressly specified or limited. The terms "mounted," "connected," and "connected" should be interpreted broadly. For example, "connected" can refer to a fixed connection, a detachable connection, or an integral connection; and can be directly connected or indirectly connected through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention 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 invention.

Claims

1. An injection nozzle assembly, characterized in that: include: An injection nozzle, comprising an injection inlet and a plurality of first flow channels respectively connected to the injection inlet; A plurality of injection nozzles, each of which is fixed to the bottom of the injection nozzle along the axial direction of the first runner, and each of which includes a second runner communicated with the first runner and a gate communicated with the second runner; The injection nozzle assembly further includes a drive cylinder sleeved on the outer wall of the injection nozzle, and a plurality of valve needles extending from the first flow channel to the second flow channel, wherein the drive cylinder drives the plurality of valve needles to simultaneously perform linear reciprocating motion, and the valve needles are configured to open or close the corresponding gates; The driving cylinder includes a cylinder body and a piston disposed in the cylinder body, wherein the cylinder body and the piston together define a through-hole for mounting the injection nozzle, wherein the outer wall of the injection nozzle is adapted to fit the inner wall of the through-hole, and the injection nozzle further includes a positioning and mounting portion for positioning and mounting the cylinder body in a vertical direction; The piston includes a movable portion movably arranged on the inner wall of the cylinder body, and a connecting portion formed by the movable portion extending axially and fixedly mounted to the valve needle, wherein the connecting portion is arranged parallel to the top wall of the cylinder body; The injection nozzle includes a first injection nozzle body extending downward from the top of the cylinder body, and a second injection nozzle body fixed to the bottom of the first injection nozzle body along the axial direction of the first injection nozzle body. The top surface of the first injection nozzle body is provided with the injection inlet. The first injection nozzle body and the second injection nozzle body jointly define the plurality of the aforementioned first flow channels. The plurality of injection nozzle heads are respectively threadedly connected to the bottom of the injection nozzle, wherein the bottom of the injection nozzle is recessed upward to form a thread groove threadedly connected to the injection nozzle head.

2. The injection nozzle assembly according to claim 1, characterized in that: The positioning and mounting portion includes a first limiting boss portion extending outward from the first injection nozzle body to form a limiting abutment against the inner top wall of the cylinder body, and a second limiting boss portion extending outward from the second injection nozzle body to form a limiting abutment against the inner bottom wall of the cylinder body, wherein the second injection nozzle body is arranged below the connecting portion and extends out of the through cavity, and a movable space for the connecting portion to move up and down is defined between the first injection nozzle body and the second injection nozzle body.

3. The injection nozzle assembly according to claim 2, characterized in that: The cylinder body includes a top cover, a cylinder sleeve, and a base from top to bottom; wherein the top cover, the cylinder sleeve, and the base jointly define the aforementioned through cavity, the top cover forms the aforementioned first limiting boss portion, and the base forms the aforementioned second limiting boss portion.

4. The injection nozzle assembly according to claim 1, characterized in that: The center line of the injection inlet coincides with the center line of the through cavity, and the plurality of first flow channels are arranged in a circular array with the center line of the through cavity as the center axis.

5. An injection molding machine, characterized in that: An injection nozzle assembly comprising the injection nozzle assembly according to any one of claims 1 to 4.

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