Multi-stage driving device and hot runner system applying same

Abstract

The utility model relates to the field of injection molding equipment, in particular to a multi-stage driving device and a hot runner system applying the same. The multi-stage driving device comprises an outer cylinder body, an outer piston, an inner cylinder body and an inner piston; a first cavity is formed in the outer cylinder body; a second cavity is formed in the outer cylinder body; the outer piston is arranged in the first cavity in a sliding mode, and the inner piston is arranged in the second cavity in a sliding mode. And a two-stage telescopic driving structure is arranged in the multi-stage driving device, so that the multi-stage driving device can drive the valve needle to move quickly and accurately, and glue injection outlets in different positions of the thermal resistor are opened or closed according to the requirements of the injection molding industry. According to the hot runner system, efficient injection molding of bottle blanks with single colors can be achieved, and accurate injection molding of bottle blanks with two colors can also be achieved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding equipment, and in particular to a multi-stage drive device and a hot runner system using the same. Background Technology

[0002] The production of plastic packaging bottles mainly includes two processes: injection molding to obtain bottle preforms and blow molding the bottle preforms into finished plastic bottles. Injection molding involves injecting plastic into a mold and then cooling it to form the preform. With changing product packaging needs, the market demand for plastic packaging bottles in multiple colors is increasing. Therefore, how to injection mold preforms in multiple colors has become crucial for the production of multi-colored plastic packaging bottles.

[0003] The existing technology still widely uses single-color plastic bottle injection molding and blow molding technology because the hot runner system in the existing plastic preform injection molding equipment is still a single runner, and the drive device used for injection molding has a simple structure and only has a single fixed drive mode. Therefore, it is not conducive to the installation and application in a compact hot runner system. At the same time, it is difficult to install and has low precision when equipped with multiple existing drive devices for separate control, and it is also difficult to realize the structure of the hot runner. Utility Model Content

[0004] To address the aforementioned shortcomings, the purpose of this invention is to propose a multi-stage drive device that can be driven according to injection molding needs, thereby enabling the valve needle to accurately open or close the corresponding injection port.

[0005] Another objective of this invention is to propose a hot runner system with a compact and ingenious structure that can precisely achieve injection molding of multi-colored plastic bottle preforms.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A multi-stage drive device for driving the movement of a valve needle in a hot runner system includes: an outer cylinder, an outer piston, an inner cylinder, and an inner piston; the outer cylinder has a first cavity, the top space of which is connected to an external compression device via a pipe; the outer cylinder has a second cavity, the top space of which is connected to the external compression device via a pipe; the outer piston is disposed in the first cavity and, under the control of the external compression device, can slide up and down against the inner wall of the first cavity, thereby driving the inner cylinder to slide up and down; the inner piston is disposed in the second cavity and, under the control of the external compression device, can slide up and down against the inner wall of the second cavity.

[0008] Preferably, the outer piston and the inner cylinder are integrally formed, and the outer wall of the inner cylinder slides closely against the interior of the first cavity.

[0009] Preferably, the external compression device injects or extracts gas or liquid into or from the first cavity or the second cavity through a pipe.

[0010] Preferably, both the outer piston and the inner piston have annular grooves on their outer walls, and a sealing ring is provided in the annular groove.

[0011] Preferably, the lower end of the outer cylinder is provided with a sealing plate, and the middle part of the sealing plate is provided with a sliding hole that allows the valve needle to pass through; the outside of the sealing plate is also provided with a guide member that allows the valve needle to pass through, and the guide member is provided with a guide hole.

[0012] A hot runner system includes: a dispensing device, a flow divider, a valve needle, a hot nozzle, and a multi-stage drive device as described above; the flow divider has a first inlet and a second inlet on its upper end face, and a plurality of first outlets and a plurality of second outlets on its lower end face; the flow divider has a first channel and a second channel inside; the first inlet and the first outlet are connected through the first channel, and the second inlet and the second outlet are connected through the second channel; the dispensing device has a dispensing port, which is connected to the first inlet and the second inlet respectively; the dispensing device is used to store adhesive flow and control adhesive flow rate; the hot nozzle is tubular, with a sliding cavity extending through both ends in its middle along the axial direction; the tube wall of the hot nozzle has a first dispensing channel and a second dispensing channel; the upper end of the first dispensing channel is connected to the first outlet. The lower end of the first glue injection channel is provided with a first glue injection outlet; the upper end of the second glue injection channel is connected to the second glue outlet, and the lower end of the second glue injection channel is provided with a second glue injection outlet; both the first glue injection outlet and the second glue injection outlet are disposed on the inner wall of the sliding cavity, and the first glue injection outlet is located above the second glue injection outlet; the multi-stage drive device is installed above the flow divider, the upper end of the valve needle is connected to the inner piston of the drive device, the lower end of the valve needle passes through the flow divider and the hot nozzle in sequence, and under the drive of the multi-stage drive device, the valve needle slides up and down in the sliding cavity. When the valve needle slides to the first glue injection outlet or the second glue injection outlet, the first glue injection outlet or the second glue injection outlet is closed; when the valve needle leaves the first glue injection outlet or the second glue injection outlet, the first glue injection outlet or the second glue injection outlet is opened.

[0013] Preferably, both the flow divider and the hot nozzle are made of metal, and the hot nozzle is rigidly connected to the flow divider. The flow divider is provided with a heating structure. The first and second injection channels are both spiral pipes, which are coiled inside the pipe wall of the hot nozzle.

[0014] Preferably, the diversion device includes a first flow channel and a second flow channel distributed vertically within the diversion device.

[0015] Preferably, the angle between the connection point of the first flow channel and the second flow channel within the flow distribution device is 90 degrees, and the corner of the connection point is provided with an arc surface structure.

[0016] Preferably, it further includes a mounting bracket; the multi-stage drive device is nested and installed on the top of the bracket, and the outer cylinder body and the mounting bracket are integrally formed; the guide, the flow divider and the hot nozzle are all located below the multi-stage drive device and are installed on the mounting bracket from top to bottom; the upper end of the valve needle is connected to the multi-stage drive device for transmission, and its lower end passes through the guide, the flow divider and the hot nozzle in sequence.

[0017] The beneficial effects of the embodiments of this utility model are as follows: The multi-stage drive device has two-stage telescopic drive structures inside, and each stage of the telescopic drive structure can move independently under the control of an external compression device. This allows the multi-stage drive device to drive the valve needle to move quickly and accurately, and to open or close the injection outlet at different thermal resistance positions according to the needs of the injection molding industry. The hot runner system can achieve efficient injection molding of preforms of a single color, and can also achieve precise injection molding of preforms of two colors. Attached Figure Description

[0018] Figure 1 This is an exploded cross-sectional view of a portion of the hot runner system in one embodiment of this utility model;

[0019] Figure 2 This is an exploded structural diagram of a portion of the hot runner system in one embodiment of this utility model;

[0020] Figure 3 This is a cross-sectional schematic diagram of a portion of the structure of the hot runner system in one embodiment of this utility model;

[0021] Figure 4 This is a cross-sectional view of the diversion device in one embodiment of the present invention.

[0022] The components include: a multi-stage drive device 100, an outer cylinder 110, a first cavity 111, a sealing plate 112, a guide 113, an outer piston 120, an annular groove 121, an inner cylinder 130, a second cavity 131, an inner piston 140, a flow divider 200, a first flow channel 210, a second flow channel 220, a valve needle 230, a hot nozzle 300, a first glue injection channel 310, a first glue injection outlet 311, a second glue injection channel 320, a second glue injection outlet 321, and a mounting bracket 400. Detailed Implementation

[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] One embodiment of this application, such as Figures 1 to 4 As shown, a hot runner system includes: a dispensing device, a flow divider 200, a valve needle 230, a hot nozzle 300, and a multi-stage drive device 100; the multi-stage drive device 100 is used to drive the movement of the valve needle 230 in the hot runner system; it includes: an outer cylinder 110, an outer piston 120, an inner cylinder 130, and an inner piston 140; the outer cylinder 110 has a first cavity 111, the top space of the first cavity 111 being connected to an external compression device through a pipe; the outer cylinder 110... A second cavity 131 is provided, and the top space of the second cavity 131 is connected to an external compression device through a pipe. The outer piston 120 is disposed in the first cavity 111 and, under the control of the external compression device, can slide up and down against the inner wall of the first cavity 111, thereby driving the inner cylinder 130 to slide up and down. The inner piston 140 is disposed in the second cavity 131 and, under the control of the external compression device, can slide up and down against the inner wall of the second cavity 131. The multi-stage drive device 100 has two-stage telescopic drive structures inside, and each stage of telescopic drive structure can move independently under the control of the external compression device, so that the multi-stage drive device 100 can drive the valve needle 230 to achieve rapid and precise movement, and realize the opening or closing of the injection outlet at different thermal resistance positions according to the needs of the injection molding industry.

[0025] The flow distribution device 200 has a first glue inlet and a second glue inlet on its upper end face, and a plurality of first glue outlets and a plurality of second glue outlets on its lower end face. The flow distribution device 200 has a first flow channel 210 and a second flow channel 220 inside. The first glue inlet and the first glue outlet are connected through the first flow channel 210, and the second glue inlet and the second glue outlet are connected through the second flow channel 220. The glue injection device has a glue injection port. The glue inlet is connected to the first glue inlet and the second glue inlet, respectively; the glue dispensing device is used to store glue flow and control glue flow rate; the hot nozzle 300 is tubular, with a sliding cavity extending through both ends in its middle along the axial direction; the tube wall of the hot nozzle 300 is provided with a first glue dispensing channel 310 and a second glue dispensing channel 320; the upper end of the first glue dispensing channel 310 is connected to the first glue outlet, and the lower end of the first glue dispensing channel 310 is provided with a first glue dispensing outlet 311; the upper end of the second glue dispensing channel 320 is connected to the first glue outlet. The two glue outlets are connected, and the lower end of the second glue channel 320 is provided with a second glue outlet 321; the first glue outlet 311 and the second glue outlet 321 are both provided on the inner wall of the sliding cavity, and the first glue outlet 311 is located above the second glue outlet 321; the multi-stage drive device 100 is installed above the diversion device 200, the upper end of the valve needle 230 is connected to the inner piston 140 of the drive device, the lower end of the valve needle 230 passes through the diversion device 200 and the hot nozzle 300 in sequence, and under the drive of the multi-stage drive device 100, the valve needle 230 slides up and down in the sliding cavity. When the valve needle 230 slides to the first glue outlet 311 or the second glue outlet 321, the first glue outlet or the second glue outlet 321 is closed; when the valve needle 230 leaves the first glue outlet 311 or the second glue outlet 321, the first glue outlet 311 or the second glue outlet 321 is opened.

[0026] Specifically, the outer piston 120 and the inner cylinder 130 are integrally formed, and the outer wall of the inner cylinder 130 slides closely against the interior of the first cavity 111. This makes the structure of the multi-stage drive device 100 more compact and reduces production costs.

[0027] Specifically, the external compression device injects or extracts gas or liquid into the first cavity 111 or the second cavity 131 through a pipe. That is, the multi-stage drive device 100 can be a telescopic cylinder or a hydraulic telescopic device.

[0028] Specifically, both the outer piston 120 and the inner piston 140 have annular grooves 121 on their outer walls, and sealing rings are provided in the annular grooves 121. The sealing rings enable the first cavity 111 and the second cavity 131 to achieve a better sealing structure, resulting in higher driving accuracy of the multi-stage drive device 100.

[0029] Specifically, the lower end of the outer cylinder 110 is provided with a sealing plate 112, and the middle of the sealing plate 112 is provided with a sliding hole through which the valve needle 230 can pass; the outside of the sealing plate 112 is also provided with a guide member 113 through which the valve needle 230 can pass, and the guide member 113 is provided with a guide hole. Because the valve needle 230 needs to move up and down under the drive of the multi-stage drive device 100, the sealing plate 112 and the guide member 113 can provide sliding support for the valve needle 230, making the movement of the valve needle 230 more precise during the up and down movement, and preventing the valve needle 230 from swaying left and right.

[0030] Specifically, both the flow divider 200 and the heating nozzle 300 are made of metal, and the heating nozzle 300 is rigidly connected to the flow divider 200. The flow divider 200 is equipped with a heating structure. The first injection channel 310 and the second injection channel are both spiral pipes, coiled inside the wall of the heating nozzle 300. This ensures that the temperature of the injection-molded plastic remains stable within a set range as it flows through the flow divider 200 and the heating nozzle 300, which helps improve the quality of the finished preform.

[0031] Specifically, the flow divider 200 includes a first flow channel 210 and a second flow channel 220 distributed vertically within the flow divider 200. The flow divider 200 can be a single integrated structure or it can be formed by stacking two flow dividers vertically. The two flow channels within the flow divider 200 are arranged in vertical layers, which makes the injection plastic in the two flow channels more uniform and stable in heating, and also facilitates the production and processing of the flow divider 200.

[0032] Specifically, the angle between the first flow channel 210 and the second flow channel 220 at their connection point within the flow distribution device 200 is 90 degrees, and the corners at the connection point are provided with arc-shaped structures. This allows the injection molding material to flow more smoothly within the flow distribution device 200, preventing accumulation at the connection point.

[0033] Specifically, it also includes a mounting bracket 400; the multi-stage drive device is nested and installed on the top of the bracket, and the outer cylinder 110 and the mounting bracket 400 are integrally formed; the guide 113, the flow divider 200 and the hot nozzle 300 are all located below the multi-stage drive device 100 and are installed on the mounting bracket 400 from top to bottom; the upper end of the valve needle 230 is connected to the multi-stage drive device 100 for transmission, and its lower end passes through the guide 113, the flow divider 200 and the hot nozzle 300 in sequence.

[0034] In the hot runner system, the first injection outlet 311 is located above the second injection outlet 321 because the multi-stage drive device 100 can achieve two different stroke extension / retraction drives according to different needs. When only one cylinder in the multi-stage drive device 100 is fully retracted, the valve needle 230 moves upward with a smaller stroke, at which time the second injection outlet 321 will open, while the first injection outlet 311 is still closed by the valve needle 230, and injection molding can only be performed from the second injection outlet 321. When both the first cavity 111 and the second cavity 131 of the multi-stage drive device 100 are in a retracted state, both the first injection outlet 311 and the second injection outlet 321 are open, and injection molding can be performed from any one or both injection outlets as needed.

[0035] The hot runner system enables efficient injection molding of preforms of a single color, as well as precise injection molding of preforms of two colors.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0038] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0039] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A multi-stage driving device for driving the movement of a valve needle in a hot runner system; characterized in that The multi-stage driving device comprises an outer cylinder, an outer piston, an inner cylinder and an inner piston; The outer cylinder is provided with a first cavity, and the top space of the first cavity is communicated with an external compression device through a pipeline; The outer cylinder is provided with a second cavity, and the top space of the second cavity is communicated with an external compression device through a pipeline; The outer piston is arranged in the first cavity and can slide up and down along the inner wall of the first cavity under the control of the external compression device, thereby driving the inner cylinder to slide up and down; the inner piston is arranged in the second cavity and can slide up and down along the inner wall of the second cavity under the control of the external compression device.

2. A multi-stage drive as claimed in claim 1, characterized in that The outer piston and the inner cylinder are integrally formed, and the outer wall of the inner cylinder slides along the inner wall of the first cavity.

3. A multi-stage drive as claimed in claim 1, wherein The external compression device blows or extracts gas or liquid into or out of the first cavity or the second cavity through a pipeline.

4. A multi-stage drive as claimed in claim 1, wherein, The outer wall of the outer piston and the inner piston is provided with an annular groove, and a sealing ring is arranged in the annular groove.

5. A multi-stage drive as claimed in claim 1, wherein, The lower end of the outer cylinder is provided with a blocking plate, and the middle part of the blocking plate is provided with a sliding hole through which the valve needle passes; the outer part of the blocking plate is further provided with a guide part through which the valve needle passes, and the guide part is provided with a guide hole.

6. A hot runner system characterized by, It comprises: a glue injection device, a flow distribution device, a valve needle, a hot nozzle and the multi-stage driving device according to any one of claims 1 to 5; The upper end surface of the flow distribution device is provided with a first glue inlet and a second glue inlet, the lower end surface of the flow distribution device is provided with a plurality of first glue outlets and a plurality of second glue outlets, the inside of the flow distribution device is provided with a first flow channel and a second flow channel, the first glue inlet is communicated with the first glue outlet through the first flow channel, and the second glue inlet is communicated with the second glue outlet through the second flow channel; The glue injection device is provided with a glue injection port, and the glue injection port of the glue injection device is communicated with the first glue inlet and the second glue inlet respectively; the glue injection device is used for storing glue flow and controlling glue flow rate; The hot nozzle is tubular, and a sliding cavity penetrating through both ends is arranged in the middle part in the axial direction, and the pipe wall of the hot nozzle is provided with a first glue injection channel and a second glue injection channel; the upper end of the first glue injection channel is communicated with the first glue outlet, and the lower end of the first glue injection channel is provided with a first glue injection outlet; the upper end of the second glue injection channel is communicated with the second glue outlet, and the lower end of the second glue injection channel is provided with a second glue injection outlet; the first glue injection outlet and the second glue injection outlet are arranged on the inner wall of the sliding cavity, and the first glue injection outlet is located above the second glue injection outlet; The multi-stage driving device is installed above the flow distribution device, the upper end of the valve needle is in transmission connection with the inner piston of the driving device, the lower end of the valve needle passes through the flow distribution device and the hot nozzle in sequence, and the valve needle slides up and down in the sliding cavity under the driving of the multi-stage driving device; when the valve needle slides to the first glue injection outlet or the second glue injection outlet, the first glue injection outlet or the second glue injection outlet is closed; when the valve needle leaves the first glue injection outlet or the second glue injection outlet, the first glue injection outlet or the second glue injection outlet is opened.

7. The hot-duct system of claim 6, wherein The flow distribution device and the hot nozzle are both made of metal material, the hot nozzle is in rigid connection with the flow distribution device, the flow distribution device is provided with a heating structure, the first glue injection channel and the second glue injection channel are both spiral pipelines and are spirally arranged in the pipe wall of the hot nozzle.

8. The hot-duct system of claim 6, wherein, The flow distribution device comprises the first flow channel and the second flow channel arranged in the flow distribution device.

9. The hot-duct system of claim 6, wherein, The angle of the mutual connection of the first flow channel and the second flow channel in the flow distribution device is 90 degrees, and the corner of the mutual connection is provided with an arc surface structure.

10. The hot-duct system of claim 6, wherein, The installation support is further provided, the multi-stage driving device is nested and installed on the top of the installation support, the outer cylinder body is integrally formed with the installation support, the guide piece, the flow distribution device and the hot nozzle are all located below the multi-stage driving device and are sequentially installed on the installation support from top to bottom, the upper end of the valve needle is in transmission connection with the multi-stage driving device, and the lower end of the valve needle sequentially passes through the guide piece, the flow distribution device and the hot nozzle.

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