Anti-blocking nozzle structure for injection molding

Abstract

The utility model discloses an anti-blocking nozzle structure for injection molding, which belongs to the technical field of injection molding nozzles, is mounted on a charging barrel and comprises a fixed seat, a nozzle main body, a nozzle head and a valve needle, the nozzle main body is sleeved on the fixed seat, the nozzle head is fixedly mounted at the front end of the nozzle main body, and a channel is arranged in the nozzle main body. According to the utility model, the cleaning component is designed, the relative axial movement of the nozzle main body and the valve needle in the injection molding process is used as a driving source, the inner wall of the outlet of the nozzle head is automatically scraped and cleaned, and the inner wall of the outlet of the nozzle head can be automatically cleaned through the structural design of the spiral scraper, so that the nozzle head can be conveniently cleaned. By means of the technical scheme, solidified plastic attached to the inner wall can be effectively scraped away, the problem that residual plastic is accumulated to block a channel is solved, the air outlet holes are further designed, high-pressure air can be guided in to thoroughly blow a scraped area, a double-cleaning mechanism combining mechanical scraping and airflow blowing is achieved, and the cleaning effect is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding nozzle technology, and specifically provides an anti-clogging nozzle structure for injection molding. Background Technology

[0002] In the field of injection molding technology, the nozzle, as a key component connecting the injection molding machine barrel and the mold, directly affects production efficiency and product quality due to its stable working condition. Currently, common injection nozzles mainly consist of basic components such as a fixed base, nozzle body, nozzle head, and valve needle. The axial movement of the valve needle controls the opening and closing of the molten plastic channel.

[0003] However, existing injection nozzles have significant drawbacks in practical use. During injection intervals or when injection work stops, the molten plastic remaining at the nozzle head, especially at the exit, easily cools and solidifies due to heat dissipation, gradually accumulating on the inner wall surface of the nozzle head exit. This continuous accumulation of solidified plastic eventually leads to nozzle channel blockage, causing injection work interruptions. Traditional solutions mainly rely on manual disassembly and cleaning or the use of external heating devices to prevent cooling, but these methods have significant shortcomings: manual cleaning requires machine shutdown, severely impacting production efficiency and is cumbersome; while external heating is not only energy-intensive but may also lead to localized overheating, causing thermal degradation of the plastic and accelerating internal nozzle contamination.

[0004] Therefore, an anti-clogging nozzle structure for injection molding is needed. Utility Model Content

[0005] To solve the above problems, this utility model provides an anti-clogging nozzle structure for injection molding.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: an anti-clogging nozzle structure for injection molding, installed on a barrel, including a fixed base, a nozzle body, a nozzle head, and a valve needle. The nozzle body is sleeved on the fixed base, and an external tension spring is installed between the nozzle body and the fixed base. The nozzle head is fixedly installed at the front end of the nozzle body. A channel is opened inside the nozzle body, and the valve needle is movably assembled in the channel. The valve needle is fixedly installed on a fixing screw inside the barrel. A cleaning component is assembled at the front end of the valve needle, and the cleaning component is used to clean the outlet of the nozzle head.

[0007] The cleaning assembly includes an air guide tube and a spiral scraper. The air guide tube is fixedly installed at the front end of the valve needle. Support rods are symmetrically fixedly installed on the outer wall of the air guide tube. The inner end of the spiral scraper is fixedly installed on the support rod, and the outer end of the spiral scraper is fixedly installed on the outer end of the inner wall of the nozzle head outlet.

[0008] The front end of the valve needle is configured as a spherical blocking block, the front end of the blocking block is provided with a threaded hole, and the air guide tube is screwed into the threaded hole. The valve needle is provided with an air guide channel communicating with the threaded hole. The outer surface of the air guide tube is provided with an air outlet at an angle. The outer end of the air guide tube is equipped with a cover assembly, and the cover assembly is used to block the air outlet.

[0009] Furthermore, the channel is tapered, and the diameter of the blocking block is larger than the diameter of the small hole end of the channel.

[0010] Furthermore, the inner surface of the spiral scraper is uniformly fixed with segmented scrapers, the spiral scraper is blade-shaped on the side facing the valve needle, and the spiral scraper is convex on the side away from the valve needle.

[0011] Furthermore, an auxiliary support rod is fixedly installed between the support rod and the air guide pipe.

[0012] Furthermore, the cover assembly includes a cover and a fixed threaded block, and the cover is sleeved on the outer end of the air duct. The outer surface of the cover is symmetrically provided with sliding grooves, and the support rod is located in the sliding groove. The inner wall of the air duct is provided with threads, and the fixed threaded block is screwed into the air duct. An inner tension spring is fixedly installed between the inner wall of the cover and the fixed threaded block.

[0013] Furthermore, the fixed threaded block is provided with a vent hole, and the inner wall of the fixed threaded block is symmetrically provided with grooves.

[0014] The beneficial effects of using this utility model are:

[0015] This invention designs a cleaning component that uses the relative axial movement of the nozzle body and valve needle during injection molding as a driving source to achieve automatic scraping and cleaning of the inner wall of the nozzle head outlet. Through the spiral scraper structure design, it can effectively scrape off the solidified plastic adhering to the inner wall, solving the problem of residual plastic accumulation clogging the channel.

[0016] This invention also features an air outlet that allows high-pressure gas to be introduced to thoroughly clean the scraped area, achieving a dual cleaning mechanism that combines mechanical scraping with airflow cleaning, thus greatly improving the cleaning effect.

[0017] This invention achieves an online self-cleaning function, eliminating the need for frequent machine shutdowns to disassemble and clean the nozzles, greatly reducing production downtime, improving equipment utilization and production efficiency. At the same time, the stable nozzle working condition ensures the consistency of injection molded product quality, reduces scrap rate, and improves economic benefits. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0019] Figure 2 This is the front sectional view of the present invention.

[0020] Figure 3 This utility model Figure 2 A magnified view of part a in the middle.

[0021] Figure 4 This is one of the three-dimensional schematic diagrams of the cleaning component of this utility model.

[0022] Figure 5 This is the second perspective view of the cleaning component of this utility model.

[0023] Figure 6 This is a cross-sectional view of the spiral scraper of this utility model.

[0024] Figure 7 This is a three-dimensional schematic diagram of the cover assembly of this utility model.

[0025] The reference numerals in the attached drawings include: 1. Fixing base; 2. Nozzle body; 21. Channel; 22. External tension spring; 3. Nozzle head; 4. Valve needle; 41. Blocking block; 5. Cleaning assembly; 51. Air guide tube; 52. Support rod; 53. Spiral scraper; 54. Dividing scraper; 55. Air outlet; 56. Auxiliary support rod; 6. Cover assembly; 61. Cover; 62. Internal tension spring; 63. Fixing threaded block. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Reference Figure 1 and Figure 2 An anti-clogging nozzle structure for injection molding is installed on a barrel and includes a fixed base 1, a nozzle body 2, a nozzle head 3, and a valve needle 4. The nozzle body 2 is sleeved on the fixed base 1, and an external tension spring 22 is installed between the nozzle body 2 and the fixed base 1. The nozzle head 3 is fixedly installed at the front end of the nozzle body 2. A channel 21 is opened inside the nozzle body 2, and the valve needle 4 is movably assembled in the channel 21. The valve needle 4 is fixedly installed on a fixing screw inside the barrel. A cleaning component 5 is assembled at the front end of the valve needle 4, and the cleaning component 5 is used to clean the outlet of the nozzle head 3.

[0028] The fixed base 1, nozzle body 2, nozzle head 3, valve needle 4, and external tension spring 22 are the conventional structure of an injection molding nozzle, so their specific structure will not be described. The specific working process is as follows: When injection molding is performed, the plastic liquid flows into the channel, which will exert pressure on the nozzle body 2, causing it to overcome the tension of the external tension spring 22 and move outward, so that the valve needle 4 will no longer block the channel 21, and the plastic liquid will then flow out through the outlet of the nozzle head 3; when injection molding stops, the nozzle body 2 will be reset under the elastic force of the external tension spring 22, and at the same time the valve needle 4 will block the channel 21.

[0029] like Figures 3 to 5 As shown, the cleaning assembly 5 includes an air guide tube 51 and a spiral scraper 53. The air guide tube 51 is fixedly installed on the front end of the valve needle 4. Support rods 52 are symmetrically fixedly installed on the outer wall of the air guide tube 51. The inner end of the spiral scraper 53 is fixedly installed on the support rod 52, and the outer end of the spiral scraper 53 is fixedly installed on the outer end of the inner wall of the nozzle head 3 outlet.

[0030] The spiral scraper 53 is made of elastic metal and has a spring-like tensile capacity. One end of the spiral scraper 53 is fixed to the front end of the valve needle 4 by the support rod 52 and the air guide tube 51, and the other end is fixed to the outer end of the inner wall of the nozzle head 3 outlet by welding or other means. Therefore, when the injection molding is performed, the nozzle head 3 will pull the spiral scraper 53 open when it moves outward with the nozzle body 2. After the injection molding is completed, the nozzle head 3 will reset and drive the spiral scraper 53 to reset simultaneously. At this time, the movement of the spiral scraper 53 will scrape the plastic attached to the inner wall of the nozzle head 3 outlet, avoiding blockage after long-term accumulation.

[0031] In addition, by repeatedly moving the fixed screw connected to the valve needle 4, the valve needle 4 and the air guide tube 51 can be moved repeatedly to scrape off the plastic accumulated in the nozzle head 3 outlet.

[0032] Specifically, the front end of the valve needle 4 is configured as a spherical blocking block 41, the front end of the blocking block 41 is provided with a threaded hole, and the air guide tube 51 is screwed into the threaded hole. The valve needle 4 is provided with an air guide channel communicating with the threaded hole. The outer surface of the air guide tube 51 is provided with an air outlet 55 at an angle. The outer end of the air guide tube 51 is equipped with a cover assembly 6, and the cover assembly 6 is used to cover the air outlet 55.

[0033] The outer end of the air guide channel can be connected to a pipeline and an external air pump. The external air pump is used to fill in high-pressure airflow. The high-pressure airflow finally flows out from the inclined air outlet 55, which can blow out the plastic hanging in the nozzle head 3 outlet and ensure the permeability of the space inside the nozzle head 3 outlet.

[0034] Specifically, channel 21 is tapered, and the diameter of the blocking block 41 is larger than the diameter of the small hole end of channel 21.

[0035] Specifically, such as Figure 6 As shown, the inner surface of the spiral scraper 53 is uniformly fixed with dividing scrapers 54. The spiral scraper 53 is blade-shaped on the side facing the valve needle 4, and the spiral scraper 53 is convex on the side away from the valve needle 4.

[0036] While the spiral scraper 53 scrapes the plastic from the inner wall of the nozzle head 3 outlet, the dividing scraper 54 can separate the plastic, making it easier for the scraped plastic to fall off.

[0037] The shape of the spiral scraper 53 is defined, with one blade-shaped end used to scrape the plastic from the inner wall of the nozzle head 3 outlet, and the protruding end guiding the scraped plastic to bend inward, making the plastic easier to remove.

[0038] The width, thickness, and number of turns of the spiral scraper 53 can be adjusted according to the actual application to better scrape and remove the plastic. It is necessary to ensure that when the nozzle head 3 moves to the outermost position during the injection molding process, the support rod 52 will not contact the nozzle body 2 and the nozzle head 3 to avoid damage due to excessive pressure.

[0039] Specifically, an auxiliary support rod 56 is fixedly installed between the support rod 52 and the air duct 51 to increase the support strength.

[0040] Specifically, such as Figure 7 As shown, the cover assembly 6 includes a cover 61 and a fixing threaded block 63. The cover 61 is sleeved on the outer end of the air duct 51. The outer surface of the cover 61 is symmetrically provided with sliding grooves, and the support rod 52 is located in the sliding groove. The inner wall of the air duct 51 is provided with threads, and the fixing threaded block 63 is screwed into the air duct 51. An inner tension spring 62 is fixedly installed between the inner wall of the cover 61 and the fixing threaded block 63.

[0041] A shielding plate is welded to the inner end surface of the cover 61. When the cover 61 is fitted onto the air duct 51, the shielding plate is inserted into the inner side of the air duct 51 and fits against the inner wall of the air duct 51 to prevent gas from leaking out of the groove when the cover assembly 6 moves outward.

[0042] Normally, the cover 61 blocks the air outlet 55 to prevent plastic from flowing into the air outlet 55 during the injection molding process. When high-pressure gas is injected through the air guide channel, the high-pressure gas pushes the cover 61 to move outward against the inner tension spring 62 and exposes the air outlet 55 to blow off the plastic. When the high-pressure gas is stronger, it will cause the cover 61 to move a further distance, causing the blocking plate to move out of the air guide tube 51. At this time, air can also be discharged from the outside of the air guide tube 51 to enhance the effect of blowing off the plastic.

[0043] When installing the cover assembly 6, first weld one end of the inner tension spring 62 to the surface of the fixing threaded block 63, then screw the fixing threaded block 63 into the air duct 51, and then pull out the inner tension spring 62 to complete the welding with the cover 61.

[0044] Specifically, the fixed threaded block 63 has a vent hole, and the inner wall of the fixed threaded block 63 has symmetrical grooves. The grooves facilitate the application of force to the fixed threaded block 63 for rotation, thereby facilitating the installation of the fixed threaded block 63 in the air duct 51.

[0045] The above content is only a preferred embodiment of this utility model. For those skilled in the art, many changes can be made in the specific implementation and application scope based on the concept of this utility model. As long as these changes do not depart from the concept of this utility model, they all fall within the protection scope of this utility model.

Claims

1. A clog-resistant nozzle structure for injection molding, mounted on a barrel, characterized in that: The device includes a fixed base, a nozzle body, a nozzle head, and a valve needle. The nozzle body is sleeved on the fixed base, and an external tension spring is installed between the nozzle body and the fixed base. The nozzle head is fixedly installed at the front end of the nozzle body. The nozzle body has an internal channel, and the valve needle is movably assembled in the channel. The valve needle is fixedly installed on a fixing screw inside the material cylinder. A cleaning component is assembled at the front end of the valve needle, and the cleaning component is used to clean the outlet of the nozzle head. The cleaning assembly includes an air guide tube and a spiral scraper. The air guide tube is fixedly installed at the front end of the valve needle. Support rods are symmetrically fixedly installed on the outer wall of the air guide tube. The inner end of the spiral scraper is fixedly installed on the support rod, and the outer end of the spiral scraper is fixedly installed on the outer end of the inner wall of the nozzle head outlet.

2. The anti-clogging nozzle structure for injection molding according to claim 1, characterized in that: The front end of the valve needle is configured as a spherical blocking block, the front end of the blocking block is provided with a threaded hole, and the air guide tube is screwed into the threaded hole. The valve needle is provided with an air guide channel communicating with the threaded hole. The outer surface of the air guide tube is provided with an air outlet at an angle. The outer end of the air guide tube is equipped with a cover assembly, and the cover assembly is used to block the air outlet.

3. The anti-clogging nozzle structure for injection molding according to claim 2, characterized in that: The channel is tapered, and the diameter of the blocking block is larger than the diameter of the small hole end of the channel.

4. The anti-clogging nozzle structure for injection molding according to claim 1, characterized in that: The inner surface of the spiral scraper is uniformly fixed with segmented scrapers. The spiral scraper is blade-shaped on the side facing the valve needle, and protrudes on the side away from the valve needle.

5. The anti-clogging nozzle structure for injection molding according to claim 1, characterized in that: An auxiliary support rod is fixedly installed between the support rod and the air guide tube.

6. The anti-clogging nozzle structure for injection molding according to claim 2, characterized in that: The cover assembly includes a cover and a fixed threaded block. The cover is sleeved on the outer end of the air duct. The outer surface of the cover is symmetrically provided with grooves, and the support rod is located in the groove. The inner wall of the air duct is provided with threads, and the fixed threaded block is screwed into the air duct. An inner tension spring is fixedly installed between the inner wall of the cover and the fixed threaded block.

7. The anti-clogging nozzle structure for injection molding according to claim 6, characterized in that: The fixed threaded block has a vent hole, and the inner wall of the fixed threaded block has symmetrical grooves.

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