A hot runner ring-type glue feeding driving mechanism

Abstract

The utility model relates to a hot runner annular glue feeding driving mechanism, including cylinder, piston and valve needle, the cylinder includes cylinder body and cylinder cover, the cylinder body top is opened and is hollow in the inside, the cylinder cover is installed in the cylinder body top and forms the chamber in turn, the piston sliding installation is in the chamber, the cylinder body is equipped with upper air inlet and lower air inlet, its characterized in that: the piston includes seat body and stem, the stem detachable installation is in the bottom of seat body, the valve needle sets up in the stem, the cylinder body bottom is equipped with guide hole, the stem and valve needle pass through the guide hole, the stem slides in the guide hole. Solve the problem that big diameter valve needle pre -tightening force is insufficient, and the difficult problem of disassembly.

Description

Technical Field

[0001] This utility model relates to the field of hot runner technology, and in particular to a hot runner annular glue inlet drive mechanism. Background Technology

[0002] In hot runner injection molding, the valve needle, as a key actuator, often has a significantly larger diameter depending on the actual working conditions, in order to meet greater flow control or withstand higher loads. However, with the increase in valve needle diameter, its physical weight and volume also increase significantly and proportionally. This makes the operation difficulty and complexity of its assembly, disassembly and subsequent maintenance in the cylinder drive system increase dramatically, far beyond what small-diameter valve needles can achieve.

[0003] To ensure high reliability of the connection between the large-diameter valve needle and the drive mechanism, the connection structure is required to have higher preload and more complex anti-loosening design. This, in turn, increases the complexity of the special tools and operating procedures required for disassembly and assembly. Therefore, the existing cylinder drive system for large-diameter valve needles generally suffers from prominent defects such as low efficiency, difficult operation, high safety risks, and high maintenance costs. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a hot runner annular glue inlet drive mechanism to solve the problems of insufficient pre-tightening force of large-diameter valve needles and high disassembly difficulty.

[0005] To solve the above technical problems, a hot runner annular glue inlet drive mechanism is provided, including a cylinder, a piston, and a valve needle. The cylinder includes a cylinder body and a cylinder head. The top of the cylinder body is open and hollow inside. The cylinder head is installed on the top of the cylinder body to form a chamber. The piston is slidably installed in the chamber. The cylinder body has an upper air port and a lower air port. The piston includes a seat and a rod. The rod is detachably installed at the bottom of the seat. The valve needle is disposed in the rod. The bottom of the cylinder body has a guide hole. The rod and the valve needle pass through the guide hole, and the rod slides in the guide hole.

[0006] In current technology, standard small-diameter valve needle systems typically employ a method to accurately position the valve needle and prevent displacement during use. This involves hollowing out the piston from top to bottom, installing the valve needle inside, and then securing the valve needle with a plug. At least two screws are used to fix the plug to the top of the piston for positioning and fixation. However, this design suffers from insufficient valve needle tightening force in large-diameter valve needle systems, and the piston's excessive size and weight lead to inconvenient disassembly and assembly, failing to meet usage standards. A new solution addresses this by disassembling the piston into a seat and a rod. The valve needle is pre-fixed in the rod and then installed onto the seat. This piston, with its quick-release structure, maintains the valve needle's pre-tightening force, improving the system's accuracy, and allows for rapid disassembly and assembly, thus increasing maintenance efficiency.

[0007] Preferably, the top of the rod has a circumferentially circumferentially engaged protrusion, and the bottom of the base has a hook-on portion and a notch. The engaged protrusion rotates from the notch into the hook-on portion. The connection between the rod and the base is a rotary engagement, which is simple and stable, improving the quick-release performance of the valve needle system.

[0008] Preferably, a retaining ring is also included, with a retaining ring groove on the outer side of the hook-on portion, and the retaining ring is disposed in the retaining ring groove. The retaining ring is made of elastic material, further improving the quick-release performance of the valve needle system.

[0009] Furthermore, the retaining ring includes an outer retaining part and an inner retaining part. The outer retaining part is located in the retaining groove, and the inner retaining part is located in the notch and contacts the rod body. The valve needle system experiences vibration during operation, which can affect the reliability of the rod body mounted on the seat. This retaining ring design effectively restricts the rotation of the rod body, reduces the probability of the valve needle falling off and being damaged, and improves the reliability of the drive mechanism.

[0010] Preferably, the device also includes a push pin assembly. The top of the rod has a mounting cavity, and the bottom has a through-hole. The valve needle passes through the mounting cavity and the hole sequentially, but the head of the valve needle cannot pass through the hole. The push pin assembly is fixed in the mounting cavity, securing the head of the valve needle to the bottom of the cavity. This design pre-locks the valve needle in the rod. When the rod is installed on the seat, the top of the push pin assembly contacts the seat, creating a secondary abutment and preventing valve needle displacement and damage, further improving the reliability of the drive mechanism.

[0011] Preferably, an adjustment step is provided at the bottom of the chamber, and the bottom of the hook part contacts the adjustment step. The annular injection structure has high requirements for the injection volume per unit time of the injection molding machine. The performance of injection molding machines of different customers is different, and fine-tuning may be required during after-sales service. The adjustment step can be ground off to increase the sinking of the valve needle, thereby increasing the injection volume. This design allows customers to adjust it themselves and reduce after-sales costs.

[0012] Preferably, a Gladridge ring is also included. The Gladridge ring is mounted on the seat and slides against the inner wall of the chamber. The Gladridge ring has a two-way air-locking function. When mounted on the seat, it ensures that the piston is stably pushed and there will be no air leakage, which could lead to problems such as the valve needle not moving properly.

[0013] Preferably, a step seal is also included, which is fixed in the guide hole, and the rod slides on the step seal. As a commonly used component for one-way airlocking, the step seal has its airlocking side facing the seat body, ensuring sufficient airlocking during piston lifting, improving the cutting action of the annular gate, and enhancing the stability of the drive mechanism.

[0014] Preferably, the system also includes a housing, which has a receiving cavity, a first air passage, and a second air passage. The cylinder is fixedly installed in the receiving cavity. The first air passage communicates with the upper air port, and the second air passage communicates with the lower air port. Pneumatic connectors can be installed in the first and second air passages for easy connection of air pipes.

[0015] Preferably, a sealing ring is also included. The sealing ring is attached to the receiving cavity and the outer wall of the cylinder. Sealing rings are also provided between the top of the outer shell and the first air passage, between the first air passage and the second air passage, and between the second air passage and the bottom of the outer shell. Two sealed air chambers are formed in the receiving cavity, which improves the utilization rate of compressed gas and ensures the reliability of piston movement.

[0016] In summary, this hot runner annular glue inlet drive mechanism, with its piston featuring a quick-release structure, enables rapid assembly and disassembly, improving maintenance efficiency while maintaining the preload of the valve needle and enhancing the accuracy of the valve needle system. Attached Figure Description

[0017] Figure 1 This is a front sectional view of the driving structure in this implementation scheme;

[0018] Figure 2 This is the implementation method of this solution. Figure 1 Enlarged structural diagram of label A;

[0019] Figure 3 This is a schematic diagram of the piston structure in the implementation of this solution;

[0020] Figure 4 This is a schematic diagram of the piston seat structure in this embodiment of the solution;

[0021] Figure 5 This is a schematic diagram of the piston rod structure in the implementation of this solution;

[0022] Figure 6 This is a schematic diagram of the cylinder block structure in the implementation of this solution;

[0023] Figure 7 This is a cross-sectional schematic diagram of the valve pin fastening structure in the embodiment of this solution;

[0024] Among them, cylinder-1, cylinder body-11, cylinder head-12, chamber-13, upper air port-14, lower air port-15, guide hole-16, adjusting step-17, piston-2, seat-21, rod-22, hook-23, notch-24, retaining ring groove-25, retaining protrusion-26, mounting cavity-27, pin hole-28, valve needle-3, retaining ring-4, outer retaining part-41, inner retaining part-42, ejector pin-5, Glyd ring-6, Step seal-7, outer shell-8, receiving cavity-81, first air passage-82, second air passage-83, sealing ring-9. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0026] A hot runner annular glue inlet drive mechanism includes a cylinder 1, a piston 2, and a valve needle 3. The cylinder 1 includes a cylinder body 11 and a cylinder head 12. The top of the cylinder body 11 is open and hollow inside. The cylinder head 12 is installed on the top of the cylinder body 11 to form a chamber 13. The piston 2 is slidably installed in the chamber 13. The cylinder body 11 is provided with an upper air port 14 and a lower air port 15. The piston 2 includes a seat 21 and a rod 22. The rod 22 is detachably installed at the bottom of the seat 21. The valve needle 3 is disposed in the rod 22. The bottom of the cylinder body 11 is provided with a guide hole 16. The rod 22 and the valve needle 3 pass through the guide hole 16, and the rod 22 slides in the guide hole 16.

[0027] In current technology, standard small-diameter valve needle 3 systems typically employ a method to accurately position the valve needle 3 and prevent displacement during use. This involves hollowing out the piston 2 from top to bottom, installing the valve needle 3 inside the piston 2, and then using a plug to tighten the valve needle 3. At least two screws are used to secure the plug to the top of the piston 2, thus achieving valve needle 3 positioning and fixation. However, this design suffers from insufficient tightening force for the valve needle 3 in large-diameter valve needle 3 systems, and the piston 2's excessive size and weight lead to inconvenient disassembly and assembly, failing to meet usage standards. A new solution addresses this by disassembling the piston 2 into a seat 21 and a rod 22. The valve needle 3 is pre-fixed in the rod 22 and then installed onto the seat 21. This quick-release piston 2 maintains the pre-tightening force of the valve needle 3, improving the accuracy of the valve needle 3 system, and enabling rapid disassembly and assembly of the valve needle 3, thereby improving maintenance efficiency.

[0028] Preferably, the top of the rod 22 is provided with a snap-fit ​​protrusion 26, and the bottom of the seat 21 is provided with a hook-fit part 23 and a notch part 24. The snap-fit ​​protrusion 26 rotates from the notch part 24 into the hook-fit part 23. The connection between the rod 22 and the seat 21 adopts a rotation snap-fit ​​method. This snap-fit ​​method is simple and stable, and improves the quick-release performance of the valve needle 3 system.

[0029] Preferably, a retaining ring 4 is also included, with a retaining ring groove 25 on the outer side of the hook part 23, and the retaining ring 4 is disposed in the retaining ring groove 25. The retaining ring 4 is made of elastic material, which further improves the quick-release performance of the valve needle 3 system.

[0030] Furthermore, the retaining ring 4 includes an outer retaining part 41 and an inner retaining part 42. The outer retaining part 41 is disposed in the retaining groove, and the inner retaining part 42 is disposed in the notch 24 and contacts the rod 22. The valve needle 3 system experiences vibration during operation, which can affect the reliability of the rod 22 mounted on the seat 21. This design of the retaining ring 4 effectively restricts the rotation of the rod 22, reduces the probability of the valve needle 3 falling off and being damaged, and improves the reliability of the drive mechanism.

[0031] Preferably, the mechanism also includes a push pin 5. The top of the rod 22 has a mounting cavity 27, and the bottom of the rod 22 has a through-hole 28. The valve needle 3 passes through the mounting cavity 27 and the hole 28 sequentially. The head of the valve needle 3 cannot pass through the hole 28. The push pin 5 is fixed in the mounting cavity 27, securing the head of the valve needle 3 to the bottom of the mounting cavity 27. This design allows the valve needle 3 to be pre-locked in the rod 22. When the rod 22 is installed on the seat 21, the top of the push pin 5 contacts the seat 21, forming a secondary abutment, preventing the valve needle 3 from shifting and becoming loose, thus further improving the reliability of the drive mechanism.

[0032] Specifically, the bottom of the chamber 13 is provided with an adjusting step 17, and the bottom of the hook part 23 contacts the adjusting step 17. The annular injection structure has high requirements for the injection volume per unit time of the injection molding machine. The performance of injection molding machines of different customers is different, and fine-tuning may be required during after-sales service. The adjusting step 17 can be ground off to increase the sinking of the valve needle 3, thereby increasing the injection volume. This design allows customers to adjust it themselves and reduce after-sales costs.

[0033] Preferably, a Gladley ring 6 is also included. The Gladley ring 6 is mounted on the seat 21 and slides on the inner wall of the chamber 13. The Gladley ring 6 has a two-way air-locking function. When mounted on the seat 21, it ensures that the piston 2 is stably pushed and there will be no air leakage, which would cause the valve needle 3 to fail to move properly.

[0034] Preferably, a step seal 7 is also included, which is fixed in the guide hole 16, and the rod 22 slides on the step seal 7. As a commonly used component for one-way airlocking, the step seal 7 has its airlocking side facing the seat 21, ensuring sufficient airlocking during the lifting of the piston 2, improving the completion of the annular gate cutting action, and enhancing the stability of the drive mechanism.

[0035] Preferably, the system also includes a housing 8, which has a receiving cavity 81, a first air passage 82, and a second air passage 83. The cylinder 1 is fixedly installed in the receiving cavity 81. The first air passage 82 communicates with the upper air port 14, and the second air passage 83 communicates with the lower air port 15. Pneumatic connectors can be installed on the first air passage 82 and the second air passage 83 for easy connection of air pipes.

[0036] Preferably, a sealing ring 9 is also included. The sealing ring 9 is attached to the receiving cavity 81 and the outer wall of the cylinder 1. Sealing rings 9 are provided between the top of the outer shell 8 and the first air passage 82, between the first air passage 82 and the second air passage 83, and between the second air passage 83 and the bottom of the outer shell 8. Two sealed air chambers are formed in the receiving cavity 81, which improves the utilization rate of compressed gas and ensures the reliability of piston 2 movement.

[0037] In summary, this hot runner annular glue inlet drive mechanism, with its piston featuring a quick-release structure, enables rapid assembly and disassembly, improving maintenance efficiency while maintaining the preload of the valve needle and enhancing the accuracy of the valve needle system.

[0038] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hot runner annular glue inlet drive mechanism, comprising a cylinder, a piston, and a valve needle, wherein the cylinder comprises a cylinder body and a cylinder head, the cylinder body is open at the top and hollow inside, the cylinder head is mounted on the top of the cylinder body to form a chamber, the piston is slidably mounted in the chamber, and the cylinder body is provided with an upper air port and a lower air port, characterized in that: The piston includes a seat and a rod. The rod is detachably mounted on the bottom of the seat, and the valve needle is disposed in the rod. The bottom of the cylinder is provided with a guide hole, through which the rod and the valve needle pass, and the rod slides in the guide hole.

2. The hot runner annular glue inlet drive mechanism according to claim 1, characterized in that: The top of the rod is provided with a snap-fit ​​protrusion, and the bottom of the base is provided with a hook-fitting part and a notch. The snap-fit ​​protrusion rotates from the notch and snaps into the hook-fitting part.

3. The hot runner annular glue inlet drive mechanism according to claim 2, characterized in that: It also includes a retaining ring, and the outer side of the hook part is provided with a retaining ring groove, and the retaining ring is disposed in the retaining ring groove.

4. The hot runner annular glue inlet drive mechanism according to claim 3, characterized in that: The retaining ring includes an outer retaining part and an inner retaining part. The outer retaining part is disposed in the retaining groove, and the inner retaining part is disposed in the notch and contacts the rod body.

5. The hot runner annular glue inlet drive mechanism according to claim 4, characterized in that: It also includes a pin assembly, wherein the top of the rod body is provided with a mounting cavity, the bottom of the rod body is provided with a through-hole, the valve needle passes through the mounting cavity and the hole in sequence, the head of the valve needle cannot pass through the hole, the pin assembly is fixed in the mounting cavity, and the pin assembly fixes the head of the valve needle to the bottom of the mounting cavity.

6. The hot runner annular glue inlet drive mechanism according to any one of claims 2-5, characterized in that: The bottom of the chamber is provided with an adjustment step, and the bottom of the hook part is in contact with the adjustment step.

7. The hot runner annular glue inlet drive mechanism according to claim 6, characterized in that: It also includes a Gladley ring, which is mounted on the seat and slides on the inner wall of the cavity.

8. The hot runner annular glue inlet drive mechanism according to claim 7, characterized in that: It also includes a step seal, which is fixed in a guide hole, and the rod slides on the step seal.

9. The hot runner annular glue inlet drive mechanism according to claim 8, characterized in that: It also includes a housing, which has a receiving cavity, a first air passage and a second air passage. The cylinder is fixedly installed in the receiving cavity. The first air passage is connected to the upper air port and the second air passage is connected to the lower air port.

10. The hot runner annular glue inlet drive mechanism according to claim 9, characterized in that: It also includes a sealing ring, which is attached to the receiving cavity and the outer wall of the cylinder. Sealing rings are provided between the top of the outer shell and the first air passage, between the first air passage and the second air passage, and between the second air passage and the bottom of the outer shell.

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