A filter device for a nozzle of an injection molding machine

Abstract

This utility model relates to the field of injection molding nozzle technology and discloses a filter device for injection molding machine nozzles, including an injection tube and an injection nozzle. A connecting seat is fixedly installed on the outer edge of the injection tube at the end away from the injection nozzle. An external thread is formed on the outer edge of the injection tube at the end away from the injection nozzle. A limiting groove is formed on the inner wall of the injection tube away from the connecting seat. A filter assembly is set on the injection tube through the limiting groove. The filter assembly includes a filter sleeve, and a through groove and a filter groove are formed on the outer edge of the filter sleeve. This filter device for injection molding machine nozzles, through the design of a sliding ring, can be driven to reciprocate by the pressure. Subsequently, a connecting rod can drive a scraper to reciprocate along the inner wall of the filter sleeve. Utilizing the adhesion characteristics of the scraper to the inner wall of the filter sleeve, impurities attached to the vicinity of the filter groove are scraped off in time, preventing the filter groove from clogging. This avoids the need for additional motors and mechanical seals, which would easily lead to higher costs and be inconvenient for widespread use.

Description

Technical Field

[0001] This utility model relates to the field of injection nozzle technology, specifically to a filter device for injection nozzles of injection molding machines. Background Technology

[0002] Injection molding machines are the main molding equipment that uses plastic molds to make various shapes of plastic products from thermoplastic or thermosetting plastics. Injection molding is the process of injecting pre-plasticized molten plastic into a closed mold cavity by means of the thrust of a screw or plunger. After solidification and shaping, the product is obtained. During the injection molding process, the molten plastic enters the injection molding machine and is then injected through the nozzle. In order to avoid clogging, it needs to be filtered.

[0003] Chinese Utility Model Patent Publication No. CN213919350U discloses an injection molding machine nozzle filtering device. This device includes a motor, a filter tube, a scraper, and a filter plate. The scraper and brush rotate to wipe the inner wall of the filter tube, cleaning out particles that clog the filter holes. This allows the injection material to be continuously pushed forward, preventing blockage inside the injection nozzle, improving injection efficiency, reducing operating costs, and facilitating worker operation. However, while this injection molding machine nozzle filtering device can effectively clean the nozzle, the addition of a motor can easily lead to leakage at the connection between the material and the motor shaft. Furthermore, the motor increases the overall production cost, making it difficult to promote its widespread use. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a filter device for injection molding machine nozzles. It can effectively solve the problem that in the prior art, although it can play a cleaning role, the addition of a motor to rotate it can easily cause leakage at the connection of the motor shaft and the high production cost of the overall structure, thus making it inconvenient to promote its use.

[0005] The technical solution adopted by this utility model is: a filter device for injection nozzle of injection molding machine, including injection tube and injection nozzle, wherein a connecting seat is fixedly installed on the outer edge of the injection tube away from the injection nozzle, an external thread is provided on the outer edge of the injection tube away from the injection nozzle, a limiting groove is provided on the inner wall of the injection tube away from the connecting seat, and a filter component is provided on the injection tube through the limiting groove.

[0006] The filter assembly includes a filter sleeve, with a through groove and a filter channel formed on the outer edge of the filter sleeve. A slide rod is fixedly installed on the inner surface of the filter sleeve, and a sliding ring is slidably connected to the outer edge of the slide rod.

[0007] Preferably, a limiting seat is fixedly installed at the outer edge of the filter sleeve, the diameter of the limiting seat is larger than the diameter of the filter sleeve, and the diameter of the limiting seat is the same as that of the limiting groove.

[0008] With the above technical solution, when installing the filter assembly, the limiting seat and the limiting groove can form a snap-fit ​​structure, thereby preventing the filter sleeve from moving axially inside the injection tube. Then, the entire nozzle is installed at the injection molding machine, and the injection molding machine can limit the limiting seat. At the same time, when changing the nozzle, it is also convenient to quickly replace the filter assembly.

[0009] Preferably, a limiting cover is fixedly installed at the end of the slide rod away from the filter sleeve, and the diameter of the limiting cover is larger than the diameter of the slide rod.

[0010] The above technical solution, through the design of the limiting cover, can prevent the sliding ring from falling off the end of the slide rod, allowing the sliding ring to slide up and down on the slide rod, which facilitates the subsequent sliding ring to drive the scraper to clean impurities on the inner wall of the filter sleeve, thus playing a limiting role.

[0011] Preferably, two connecting rods are fixedly installed at the end of the sliding ring away from the sliding ring, and scrapers are fixedly installed at the ends of the two connecting rods away from the sliding ring. The diameter of the scrapers is the same as that of the inner wall of the filter sleeve.

[0012] Through the above technical solution, the sliding ring is designed so that the pressure can drive the sliding ring to reciprocate. Then, the connecting rod can drive the scraper to move back and forth along the inner wall of the filter sleeve. By utilizing the adhesion characteristics between the scraper and the inner wall of the filter sleeve, impurities attached to the filter tank can be scraped off in time to prevent the filter tank from clogging.

[0013] Preferably, the filter tank has a circular cross-section, and multiple identical filter tanks are provided, which are distributed in a ring about the center line of the filter sleeve.

[0014] Through the above technical solutions, the circular cross-section filter tank can reduce the resistance when materials pass through, while the annular distribution of multiple filter tanks can increase the filtration area, thereby improving the material flow efficiency while ensuring filtration accuracy.

[0015] Preferably, the injection molding tube has a first groove at the end away from the external thread, and a second groove at the end of the injection molding tube close to the external thread.

[0016] Through the above technical solution, groove one and groove two can be used to embed sealing rings. When the injection-molded tube is connected to other components, the sealing ring is squeezed and deformed in the groove, filling the gap at the connection, thereby enhancing the overall sealing of the device and preventing material leakage at the connection.

[0017] Preferably, the connecting seat is located directly above the external thread, and the injection nozzle has an injection port at the end away from the injection tube, and the injection tube and the injection nozzle are interconnected.

[0018] The above technical solution features a corresponding design between the connector and the external thread, which facilitates the fixing of the injection tube to the injection molding machine using bolts and other connecting parts. The interconnected structure between the injection port and the injection tube allows the filtered molten material to be smoothly ejected from the injection nozzle.

[0019] Compared with the prior art, the present invention provides a filter device for injection molding machine nozzles, which has the following beneficial effects:

[0020] 1. This injection molding machine nozzle filter device, through the design of the sliding ring, can be driven to reciprocate by the pressure. Then, the connecting rod can drive the scraper to reciprocate along the inner wall of the filter sleeve. By utilizing the adhesion characteristics between the scraper and the inner wall of the filter sleeve, impurities attached to the filter tank can be scraped off in time to prevent the filter tank from being blocked. This avoids the need to add an extra motor and mechanical seal, which would easily lead to higher costs and make it inconvenient to promote its use.

[0021] 2. This injection molding machine nozzle filter device features a circular cross-section filter groove that reduces resistance when materials pass through. The annular distribution of multiple filter grooves increases the filtration area, improving material flow efficiency while ensuring filtration accuracy. The limiting seat and limiting groove form a snap-fit ​​structure, preventing axial movement of the filter sleeve within the injection tube. Subsequently, the entire nozzle is installed onto the injection molding machine, where the limiting seat is positioned by the injection molding machine. This also facilitates quick replacement of the filter assembly when changing the nozzle. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the installation structure of the injection-molded pipe and filter assembly of this utility model;

[0025] Figure 4 This is a schematic cross-sectional view of the present invention.

[0026] Figure 5 This is a schematic diagram of the disassembled structure of this utility model;

[0027] Figure 6 This is a schematic diagram of the disassembled structure of the filter component of this utility model;

[0028] Figure 7 This is a cross-sectional structural diagram of the filter assembly of this utility model.

[0029] The components are: 1. Injection tube; 2. Connecting seat; 3. External thread; 4. Groove one; 5. Groove two; 6. Limiting groove; 7. Filter assembly; 701. Filter sleeve; 702. Through groove; 703. Filter groove; 704. Limiting seat; 705. Slide rod; 706. Limiting cover; 707. Sliding ring; 708. Connecting rod; 709. Scraper; 8. Injection nozzle; 9. Injection port. Detailed Implementation

[0030] 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.

[0031] Example 1: As Figure 1-7 As shown, the present invention provides a filter device for injection molding machine nozzles, including an injection tube 1 and an injection nozzle 8. A connecting seat 2 is fixedly installed on the outer edge of the injection tube 1 away from the injection nozzle 8. An external thread 3 is provided on the outer edge of the injection tube 1 away from the injection nozzle 8. A limiting groove 6 is provided on the inner wall of the injection tube 1 away from the connecting seat 2. A filter assembly 7 is provided on the injection tube 1 through the limiting groove 6.

[0032] The filter assembly 7 includes a filter sleeve 701. A through groove 702 and a filter groove 703 are provided on the outer edge of the filter sleeve 701. A slide rod 705 is fixedly installed on the inner surface of the filter sleeve 701. A sliding ring 707 is slidably connected to the outer edge of the slide rod 705.

[0033] Specifically, a limiting seat 704 is fixedly installed on the outer edge of the filter sleeve 701. The diameter of the limiting seat 704 is larger than that of the filter sleeve 701. The limiting seat 704 and the limiting groove 6 have the same diameter. The advantage is that when installing the filter assembly 7, the limiting seat 704 and the limiting groove 6 can form a snap-fit ​​structure, thereby preventing the filter sleeve 701 from moving axially in the injection tube 1. Then, the entire nozzle is installed at the injection molding machine, and the limiting seat 704 can be limited by the injection molding machine. At the same time, when changing the nozzle, it is also convenient to quickly replace the filter assembly 7.

[0034] Specifically, a limiting cover 706 is fixedly installed at the end of the slide rod 705 away from the filter sleeve 701. The diameter of the limiting cover 706 is larger than the diameter of the slide rod 705. The advantage is that the design of the limiting cover 706 can prevent the sliding ring 707 from falling off the end of the slide rod 705, so that the sliding ring 707 can slide up and down on the slide rod 705. This facilitates the subsequent movement of the sliding ring 707 to drive the scraper 709 to clean the impurities on the inner wall of the filter sleeve 701, thus playing a limiting role.

[0035] Specifically, two connecting rods 708 are fixedly installed at the end of the sliding ring 707 away from the sliding ring 707. A scraper 709 is fixedly installed at the end of the two connecting rods 708 away from the sliding ring 707. The scraper 709 has the same diameter as the inner wall of the filter sleeve 701. The advantage is that, through the design of the sliding ring 707, the sliding ring 707 can be driven to reciprocate by the pressure. Then, the connecting rods 708 can drive the scraper 709 to reciprocate along the inner wall of the filter sleeve 701. By utilizing the adhesion characteristics between the scraper 709 and the inner wall of the filter sleeve 701, impurities attached to the vicinity of the filter groove 703 can be scraped off in time to prevent the filter groove 703 from becoming clogged.

[0036] Example 2: Figure 2-7 As shown, this is an improvement on the previous embodiment.

[0037] Specifically, the filter tank 703 has a circular cross-section. Multiple filter tanks 703 are provided, and the multiple filter tanks 703 are arranged in a ring about the center line of the filter sleeve 701. The advantage is that the circular cross-section of the filter tank 703 can reduce the resistance when the material passes through, and the ring arrangement of multiple filter tanks 703 can increase the filtration area, thereby improving the material flow efficiency while ensuring filtration accuracy.

[0038] Specifically, the injection tube 1 has a groove 4 at the end away from the external thread 3, and a groove 5 at the end of the injection tube 1 close to the external thread 3. The advantage is that the groove 4 and the groove 5 can be used to embed a sealing ring. When the injection tube 1 is connected to other components, the sealing ring is squeezed and deformed in the groove, filling the gap at the connection, thereby enhancing the overall sealing of the device and preventing material leakage at the connection.

[0039] Specifically, the connecting seat 2 is located directly above the external thread 3, and the injection nozzle 8 has an injection port 9 at the end away from the injection tube 1. The injection tube 1 and the injection nozzle 8 are interconnected. The advantage is that the corresponding design of the connecting seat 2 and the external thread 3 makes it easy to fix the injection tube 1 on the injection molding machine with bolts or other connecting parts. Then, the interconnection structure between the injection port 9 and the injection tube 1 allows the filtered molten material to be smoothly injected from the injection nozzle 8.

[0040] Working Principle: During use, when installing the filter assembly 7, the limiting seat 704 and the limiting groove 6 form a snap-fit ​​structure, thereby preventing the filter sleeve 701 from moving axially within the injection tube 1. Subsequently, the integral nozzle is installed onto the injection molding machine, where the limiting seat 704 is positioned. This also facilitates quick replacement of the filter assembly 7 when changing the nozzle. The limiting cover 706 prevents the sliding ring 707 from detaching from the end of the slide rod 705, allowing the sliding ring 707 to slide up and down on the slide rod 705. This facilitates the subsequent cleaning of the filter sleeve 701's inner wall by the scraper 709 driven by the sliding ring 707, thus providing a limiting function. The sliding ring 707's design allows for reciprocating motion based on pressure, subsequently driving the scraper 709 along the inner wall of the filter sleeve 701 via the connecting rod 708. The scraper 709 and the inner wall of the filter sleeve 701 are used to scrape away impurities attached to the filter tank 703 in time, preventing the filter tank 703 from clogging. The circular cross-section of the filter tank 703 can reduce the resistance when the material passes through, and the ring distribution of multiple filter tanks 703 can increase the filtration area, improving the material flow efficiency while ensuring filtration accuracy. Groove 1 4 and Groove 2 5 can be used to embed sealing rings. When the injection tube 1 is connected to other components, the sealing ring is squeezed and deformed in the groove, filling the gap at the connection, thereby enhancing the overall sealing of the device and preventing material leakage at the connection. The corresponding design of the connecting seat 2 and the external thread 3 makes it easy to fix the injection tube 1 to the injection molding machine with bolts and other connecting parts. Then, the interconnection structure between the injection port 9 and the injection tube 1 allows the filtered molten material to be smoothly injected from the injection nozzle 8.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A filter device for injection nozzles of an injection molding machine, comprising an injection tube (1) and an injection nozzle (8), characterized in that: A connecting seat (2) is fixedly installed on the outer edge of the injection tube (1) away from the injection nozzle (8). An external thread (3) is provided on the outer edge of the injection tube (1) away from the injection nozzle (8). A limiting groove (6) is provided on the inner wall of the injection tube (1) away from the connecting seat (2). A filter assembly (7) is provided on the injection tube (1) through the limiting groove (6). The filter assembly (7) includes a filter sleeve (701), a through groove (702) and a filter groove (703) are provided on the outer edge of the filter sleeve (701), a slide rod (705) is fixedly installed on the inner surface of the filter sleeve (701), and a sliding ring (707) is slidably connected to the outer edge of the slide rod (705).

2. A filter device for a nozzle of an injection molding machine according to claim 1, characterized in that: A limiting seat (704) is fixedly installed at the outer edge of the filter sleeve (701). The diameter of the limiting seat (704) is larger than the diameter of the filter sleeve (701). The diameter of the limiting seat (704) is the same as that of the limiting groove (6).

3. A filter device for a nozzle of an injection molding machine according to claim 1, characterized in that: A limiting cover (706) is fixedly installed at the end of the slide rod (705) away from the filter sleeve (701), and the diameter of the limiting cover (706) is larger than the diameter of the slide rod (705).

4. A filter assembly for a nozzle of an injection molding machine as defined in claim 1, wherein: Two connecting rods (708) are fixedly installed at one end of the sliding ring (707) away from the sliding ring (707), and scrapers (709) are fixedly installed at one end of the two connecting rods (708) away from the sliding ring (707). The scrapers (709) have the same diameter as the inner wall of the filter sleeve (701).

5. A filter for a nozzle of an injection molding machine according to claim 1, wherein: The filter tank (703) has a circular cross-section. Multiple filter tanks (703) are provided, and the multiple filter tanks (703) are distributed in a ring about the center line of the filter sleeve (701).

6. A filter for a nozzle of an injection molding machine according to claim 1, wherein: The injection tube (1) has a groove 1 (4) at the end away from the external thread (3) and a groove 2 (5) at the end of the injection tube (1) close to the external thread (3).

7. A filter for a nozzle of an injection molding machine according to claim 1, wherein: The connecting seat (2) is located directly above the external thread (3), and the injection nozzle (8) has an injection port (9) at one end away from the injection tube (1). The injection tube (1) and the injection nozzle (8) are interconnected.

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