Blowing needle for blow molding machine

Abstract

The utility model relates to a blowing needle for a blow molding machine, which comprises a blowing needle inner core which is of a hollow tube structure extending along an axial lead, an air inlet path tail section is formed on the blowing needle inner core, and the air inlet path tail section is exposed out of the head of the blowing needle; the blowing needle outer core is of a hollow pipe body structure and is arranged on the outer side of the blowing needle inner core in a sleeving mode, and the blowing needle outer core and the blowing needle inner core jointly define an exhaust path middle section; the blowing needle head is arranged at the head of the blowing needle and defines an exhaust path head section together with the blowing needle inner core, and the exhaust path head section is exposed out of the head of the blowing needle; the outer pipe body is arranged on the outer side of the blowing needle outer core in a sleeving mode, the blowing needle head is fixedly connected to the outer pipe body, and at least part of the liquid cooling path is formed between the outer pipe body and the blowing needle outer core; an exhaust path tail section is formed on the outer pipe body; the sealing cover is fixedly mounted at the end part of one side, far away from the blowing needle head, of the outer pipe body, and an air inlet path head section for cooling air to enter the blowing needle is formed on the sealing cover.

Description

Technical Field

[0001] This utility model relates to the field of blow molding technology, and in particular to a blow needle for a blow molding machine. Background Technology

[0002] A blow molding die is a tool used in the plastic blow molding process. In the blow molding process, the thermoplastic preform extruded from the extruder is first placed into the blow molding die, and then compressed air is introduced into the blow molding die to expand the preform. The preform deforms along the die cavity, thereby blowing it into a hollow product with a specific shape and size.

[0003] The blow needle is a core component used in the blow molding process. It extends into the inside of the plastic part to inject gas into it. One type of blow needle has an air inlet path for cooling air to enter the blow mold, an exhaust path for hot air to exit the blow mold, and a liquid cooling path for coolant flow. This cools the plastic part during the gas injection process, thereby increasing the blow molding speed.

[0004] However, existing blow needles with multiple fluid paths generally employ a deep blind hole integrated structure. This involves machining a relatively deep hole on a single workpiece that does not penetrate the entire workpiece. These holes typically have a high aspect ratio (depth to diameter ratio) and require high precision and surface quality during machining. This type of structure is difficult to manufacture, cumbersome to install, and prone to damaging the seal during installation, leading to water and air leaks. This, to some extent, reduces the yield rate of blow needles. Utility Model Content

[0005] In view of the above-mentioned technical problems, the purpose of this utility model is to provide a blow needle for a blow molding machine, which does not have a deep blind hole structure.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a blow needle for a blow molding machine, wherein the blow molding machine has an installation port for mounting the blow needle, and the blow needle forms an air intake path for cooling air to enter the blow molding machine, an exhaust path for high-temperature air to exit the blow molding machine, and a liquid cooling path for coolant flow. The blow needle includes: an inner core, which is a hollow tube structure extending along a central axis, and the inner core forms the end section of the air intake path, which protrudes from the head of the blow needle; an outer core, which is a hollow tube structure and sleeved on the outside of the inner core, and the outer core and the inner core together define the middle section of the exhaust path; and a blow needle head, disposed at the head of the blow needle and connected to the inner core. The blow needle core and the blow needle tip together define an exhaust path first section, which is exposed to the outside from the head of the blow needle; an outer tube body is sleeved on the outside of the blow needle core, and the blow needle head is fixedly connected to the outer tube body, at least part of the liquid cooling path is formed between the outer tube body and the blow needle core; an exhaust path last section is formed on the outer tube body, and the exhaust path first section, exhaust path middle section and exhaust path last section are sequentially fluidly connected and constitute the exhaust path; and a cap is fixedly installed on the end of the outer tube body away from the blow needle head, and an air intake path first section is formed on the cap to allow cooling air to enter the blow needle, and the air intake path first section and air intake path last section are fluidly connected and constitute the air intake path.

[0007] In the above technical solution, preferably, the inner core of the blow needle protrudes outward relative to the blow needle head.

[0008] In the above technical solution, preferably, the blow needle further includes a blow needle core rod, the inner core of the blow needle is installed on the blow needle core rod, and the blow needle core rod is fixedly installed on the inner side of the outer tube.

[0009] In the above preferred embodiment, it is further preferred that the blow needle core rod is pressed against the upper and lower sides by the cap and the blow needle outer core, respectively.

[0010] In the above preferred embodiment, even more preferably, a plurality of sealing rings are disposed between the blow needle core rod and the outer tube body.

[0011] In the above technical solution, preferably, the blow molding machine has a mounting port for installing the blow needle, and the outer wall surface of the blow needle head is configured to connect to the mounting port. More preferably, the blow needle head and the outer tube together form an outer step, which can contact the upper end face of the mounting port when the blow needle is installed thereon, thereby limiting the position of the blow needle.

[0012] In the above technical solution, the outer core of the blow needle is fixedly connected to the inside of the blow needle head. The outer core and the blow needle head together define a middle section of the liquid cooling path, which constitutes part of the liquid cooling path. The outer core and the outer tube together form a first section and a last section of the liquid cooling path located on both sides of the axis, respectively. The first section, the middle section, and the last section of the liquid cooling path are sequentially fluidly connected and constitute the liquid cooling path.

[0013] In the technical solution provided by this utility model, both the inner core and outer core of the blow needle are hollow tube structures. The inner core and outer tube form an air intake path through a cap, while the outer core, inner core, and outer tube together form an exhaust path. This blow needle avoids the use of a deep blind hole integrated structure, making it easy to install and manufacture. Attached Figure Description

[0014] Figure 1 A perspective view of the blow needle provided by this utility model;

[0015] Figure 2 for Figure 1 A cross-sectional view of the blow needle shown;

[0016] Figure 3 for Figure 2 A partial enlargement of the sectional view shown. Figure 1 ;

[0017] Figure 4 for Figure 2 A partial enlargement of the sectional view shown. Figure 2 ;

[0018] Figure 5 for Figure 1 The diagram shows the usage of the blow needle.

[0019] The image is labeled as follows:

[0020] 100. Blow needle; 10. Blow molding machine; 20. Mounting port;

[0021] 1. Inner core of the blow needle; 11. End of the air intake path; 12. Blow needle core rod;

[0022] 2. Outer core of the blow needle; 22. Middle section of the exhaust path;

[0023] 3. Blow needle; 31. Mounting part; 32. Connecting part; 33. First section of exhaust path; 34. Middle section of liquid cooling path;

[0024] 4. Outer tube body; 41. Exhaust connector; 42. End of exhaust path; 43. Liquid inlet connector; 44. Liquid outlet connector; 45. Beginning of liquid cooling path; 46. End of liquid cooling path;

[0025] 5. Cap; 51. Handling part; 52. Intake connector; 53. First section of intake path;

[0026] Y, axis. Detailed Implementation

[0027] To explain in detail the technical content, structural features, achieved objectives and effects of this application, the technical solutions in the embodiments of this application will be described below with reference to the accompanying drawings.

[0028] In this application, spatial relative terms such as “below,” “under,” “below,” “down,” “above,” “above,” “higher,” and “side” (e.g., as in a “sidewall”) are used to describe the relationship between one element and another element as shown in the accompanying drawings. Spatial relative terms are intended to include different orientations of the device in use, operation, and / or manufacture other than those depicted in the drawings. For example, if the device in the drawings is flipped, an element described as “below” or “under” another element or feature would then be positioned “above” said other element or feature. Thus, the exemplary term “below” can include both above and below orientations. Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or in other orientations), thus interpreting the spatial relative descriptive terms used herein accordingly.

[0029] In this embodiment, the term "sleeve" means that all or part of a tubular object is inserted (or sleeved) axially into the inside (or outside) of another tubular object.

[0030] In this embodiment, the term "hollow tube" refers to a tube having an internal channel that runs through it along the axial direction, and the hollow tube is annular in radial cross-section.

[0031] Figure 1 The present invention provides a blow needle 100 that can be inserted into a blow molding machine 10 (see Figure 10). Figure 5 The system provides an air intake path for cooling air to enter the blow molding machine, an exhaust path for high-temperature air to exit the blow molding machine 10, and a liquid cooling path for coolant flow. The blow molding machine 10 has a mounting port 20 suitable for connecting the blow needle 100.

[0032] Specifically, see Figure 2-4 The blow needle 100 includes a blow needle inner core 1 defined by a central axis Y, a blow needle outer core 2 sleeved outside the blow needle inner core 1, a blow needle head 3 disposed at the head of the blow needle 100, an outer tube body 4 sleeved outside the blow needle outer core 2, and a cap 5 disposed on the side of the blow needle 100 away from the head.

[0033] The inner core 1 of the blow needle is a hollow tube structure, which defines an air intake path end section 11 for cooling air flow. The air intake path end section 11 protrudes from the head of the blow needle 100 to connect with the interior of the blow molding machine 10 when the blow needle 100 is inserted into the blow molding machine 10.

[0034] The cover 5 is fixedly connected to the outer tube 4 by a number of fastening bolts (not shown in the figure). The cover 5 has a handle 51 for the operator to hold and an air inlet connector 52 for connecting to an external pipe (not shown in the figure) to provide cooling air. The interior of the cover 5 forms the first section 53 of the air inlet path for the flow of cooling air. The first section 53 of the air inlet path is in fluid communication with the last section 11 of the air inlet path of the blow needle core 1. Together, they form the main body of the aforementioned air inlet path.

[0035] The inner core 1 of the blow needle is fixedly installed inside the outer tube 4 via a blow needle rod 12. Specifically, the inner core 1 is fixedly connected to the blow needle rod 12. The outer circumferential surface of the blow needle rod 12 is fixedly connected to the inner wall surface of the end of the outer tube 4 away from the blow needle head 3. The connection between the two can be achieved through threaded connection, snap-fit, interference fit, etc. Several sealing rings are provided between the blow needle rod 12 and the outer tube 4 to seal the gap between them.

[0036] Furthermore, the blow needle core rod 12 is pressed against the cap 5 and the outer core 2 of the blow needle from the upper and lower sides respectively to prevent the blow needle core rod 12 from shifting. Several sealing rings are disposed between the blow needle core rod 12 and the cap 5 to seal the gap between them.

[0037] The outer core 2 of the blow needle is also a hollow tube structure, which is coaxially arranged with the inner core 1 of the blow needle. The inner wall surface of the outer core 2 and the outer wall surface of the inner core 1 of the blow needle together define the middle section 22 of the exhaust path for high-temperature airflow.

[0038] The blow needle head 3 is also a hollow tube structure, including a mounting portion 31 adapted to connect to the mounting port 20 and a connecting portion 32 adapted to connect to the outer tube body 4. The lower end of the blow needle outer core 2 extends into the interior of the connecting portion 32 and is fixedly connected to the inner wall surface of the blow needle head 3. Similarly, the connection between the two can be achieved through threaded connection, snap-fit, interference fit, etc. Several sealing rings are provided between the blow needle outer core 2 and the blow needle head 3 to seal the gap between them.

[0039] The inner core 1 of the blow needle passes through the interior of the blow needle head 3. The inner wall surface of the blow needle head 3 and the outer wall surface of the inner core 1 together define the first section 33 of the exhaust path, which is exposed to the outside from the head of the blow needle 100. The outer tube body 4 is provided with an exhaust connector 41 for connecting to an external pipe for discharging high-temperature air, and the exhaust connector 41 defines the last section 42 of the exhaust path. The first section 33, the middle section 22, and the last section 42 of the exhaust path are sequentially fluidly connected and constitute the exhaust path described above.

[0040] Furthermore, the inner core 1 of the blow needle is exposed to the outside relative to the blow needle head 3, thereby avoiding the low flow efficiency caused by the interference between the cooling air output from the inner core 1 and the high-temperature air entering the first section 33 of the exhaust path.

[0041] Furthermore, combined Figure 5 The mounting portion 31 of the blow needle 3 forms an outer step (not shown in the figure) with the lower end of the outer tube 4. When the blow needle 100 is installed on the blow molding machine 10, the outer wall surface of the mounting portion 31 is fixedly connected to the inner wall surface of the mounting port 20, and the outer step contacts the upper surface of the mounting port 20 to limit the blow needle 100.

[0042] The outer tube 4 is equipped with an inlet connector 43 for connecting to an external pipe for inputting coolant and an outlet connector 44 for connecting to an external pipe for outputting coolant. The inner wall surface of the outer tube 4 and the outer wall surface of the blow needle core 2 together define a liquid cooling path section 45 and a liquid cooling path section 46. The liquid cooling path section 45 and the liquid cooling path section 46 are arranged opposite each other with respect to the axis Y. The internal channels of the inlet connector 43 and the outlet connector 44 respectively constitute a part of the liquid cooling path section 45 and the liquid cooling path section 46.

[0043] The mounting part 31 of the blow needle 3 extends into the interior of the outer tube body 4. The inner wall surface of the mounting part 31 and the outer wall surface of the blow needle outer core 2 together define the middle section 34 of the liquid cooling path for the flow of coolant. The first section 45 of the liquid cooling path, the middle section 34 of the liquid cooling path and the last section 46 of the liquid cooling path are sequentially fluidly connected and constitute the above-mentioned liquid cooling path.

[0044] like Figure 5 As described above, when the blow needle 100 is inserted into the blow molding machine 10, external cooling air enters the interior of the blow molding machine 10 through the air intake path inside the blow needle 100, so that the plastic material inside the blow molding machine 10 fits into the inner cavity of the blow molding machine 10; the high-temperature air inside the blow molding machine 10 leaves through the exhaust path inside the blow needle 100; and the coolant cools the high-temperature air inside the blow needle 100 through the liquid cooling path of the blow needle 100.

[0045] The above embodiments are only for illustrating the technical concept and features of this application, and are intended to enable those skilled in the art to understand the content of this application and implement it accordingly. They should not be construed as limiting the scope of protection of this application. All equivalent changes or modifications made in accordance with the spirit of this application should be included within the scope of protection of this application.

Claims

1. A blow needle for a blow molding machine, said blow needle having an air inlet path for cooling air to enter the blow molding machine, an exhaust path for high-temperature air to exit the blow molding machine, and a liquid cooling path for coolant flow, characterized in that, The blow needle includes: The blow needle inner core is a hollow tube structure extending along a central axis. The blow needle inner core forms an air intake path end section, which is exposed to the outside from the head of the blow needle. The outer core of the blow needle is a hollow tube structure and is sleeved on the outside of the inner core of the blow needle. The outer core of the blow needle and the inner core of the blow needle together define the middle section of the exhaust path. A blow needle head is disposed at the head of the blow needle and together with the inner core of the blow needle, defines the first section of the exhaust path, which is exposed to the outside from the head of the blow needle. An outer tube body is sleeved on the outside of the outer core of the blow needle, and the blow needle head is fixedly connected to the outer tube body. At least a portion of the liquid cooling path is formed between the outer tube body and the outer core of the blow needle. An exhaust path terminal section is formed on the outer tube body, and the exhaust path terminal section, the exhaust path head section, and the exhaust path head section are sequentially fluidly connected and constitute the exhaust path. A cap is fixedly installed on the end of the outer tube away from the blow needle head. The cap has a first section of an air intake path for cooling air to enter the blow needle. The first section of the air intake path is in fluid communication with the last section of the air intake path and constitutes the air intake path.

2. The blow needle according to claim 1, characterized in that, The inner core of the blow needle protrudes outward relative to the blow needle head.

3. The blow needle according to claim 1, characterized in that, It also includes a blow needle core rod, the blow needle inner core is mounted on the blow needle core rod, and the blow needle core rod is fixedly mounted on the inside of the outer tube.

4. The blow needle according to claim 3, characterized in that, The blow needle core rod is pressed against the cap and the blow needle outer core from the top and bottom sides respectively.

5. The blow needle according to claim 3, characterized in that, Several sealing rings are provided between the blow needle core rod and the outer tube body.

6. The blow needle according to claim 1, characterized in that, The blow molding machine has a mounting port for mounting the blow needle, and the outer wall surface of the blow needle head is configured to connect to the mounting port.

7. The blow needle according to claim 6, characterized in that, The blow needle head and the outer tube body together form an outer step, which can contact the upper surface of the mounting port when the blow needle is installed in the mounting port, thereby limiting the blow needle.

8. The blow needle according to claim 1, characterized in that, The outer core of the blow needle is fixedly connected to the inside of the blow needle head. The outer core of the blow needle and the blow needle head together define the middle section of the liquid cooling path, which constitutes part of the liquid cooling path.

9. The blow needle according to claim 8, characterized in that, The blow needle outer core and the outer tube body together form a liquid cooling path first section and a liquid cooling path last section located on both sides of the axis. The liquid cooling path first section, liquid cooling path middle section and liquid cooling path last section are sequentially fluidly connected and constitute the liquid cooling path.

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