Valve needle structure

Abstract

The utility model is suitable for the technical field of injection molding processing, and provides a valve needle structure which comprises a valve needle body, the valve needle body is composed of a bottom support and a needle tube, the bottom surface of the needle tube is matched with the top surface of the bottom support, a concave cavity is formed in the bottom support, first material guide cavities located on the outer side of the concave cavity are symmetrically formed in the bottom support, and an oil cylinder is arranged in the concave cavity. According to the device, the problem that a valve needle hole is damaged due to the fact that the valve needle is used for a long time and the movement track of the valve needle deviates is solved, it is guaranteed that the needle body moves in the vertical direction all the time through the arranged positioning block, deviation of the needle body is avoided, and the service life of the needle body is prolonged. And the original sliding friction between the positioning block and the needle body is converted into rolling friction through the balls arranged on the positioning block, so that the abrasion of the positioning block to the needle body is reduced, and the effect of prolonging the service life of the needle body is achieved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, and more specifically, to a valve needle structure. Background Technology

[0002] When using a hot nozzle to inject plastic fluid into the mold cavity, a valve needle structure is usually required to close or open the gate. The valve needle structure includes a valve needle sleeve and a valve needle fitted inside the valve needle sleeve. The valve needle sleeve is used to fix the valve needle and guide its movement.

[0003] Currently, when the valve needle reciprocates within the valve needle sleeve, the valve needle lacks a positioning component in the middle. This causes the valve needle's movement trajectory to deviate over long-term use, resulting in damage to the valve needle hole and consequently, damage to the valve needle sleeve. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a valve needle structure that, through the setting of a positioning block, ensures that the needle body always moves in a vertical direction, preventing the needle body from shifting and causing damage to the needle hole on the needle tube, thereby damaging the valve needle body. In addition, the ball bearings on the positioning block change the original sliding friction between the positioning block and the needle body into rolling friction, reducing the wear of the positioning block on the needle body and thus improving the service life of the needle body.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A valve needle structure includes a valve needle body, which is composed of a base and a needle tube. The bottom surface of the needle tube mates with the top surface of the base. A concave cavity is formed inside the base. A first material guide cavity located outside the concave cavity is symmetrically formed inside the base. A hydraulic cylinder is disposed inside the concave cavity. A confluence cavity communicating with the two second material guide cavities is formed inside the needle tube. An interface is provided on the bottom surface of the base. A needle hole matching the needle body is formed at the top of the needle tube. A positioning block that slides in contact with the outer wall of the needle body is symmetrically fixed to the inner wall of the confluence cavity.

[0007] The present invention is further configured such that both of the two guide cavities, the first guide cavity and the second guide cavity, are arranged in an arc-shaped V-shape.

[0008] The present invention is further configured such that the lower ends of the two material guiding cavities converge and are connected to the interface.

[0009] The present invention is further configured such that: a plurality of smooth keyways are uniformly formed on the outer side wall of the top end of the needle body.

[0010] The present invention is further configured such that the opposite sidewalls of the two positioning blocks are both arc-shaped.

[0011] The present invention is further configured such that each of the two positioning blocks has a plurality of rotatable balls on one side wall opposite to each other.

[0012] The present invention is further configured such that multiple through holes are provided on the top surface of both positioning blocks.

[0013] The advantages of this utility model are:

[0014] 1. By using the combined use of guide chamber one and guide chamber two, the flow rate of molten material is increased, the flow speed of molten material is accelerated, and the heat loss of molten material is reduced, thereby improving the quality of injection molding. The positioning block ensures that the needle body always moves in a vertical direction, avoiding the needle body from deviating, which would damage the needle hole on the needle tube and thus damage the valve needle body.

[0015] 2. By opening multiple through holes on the positioning block, the molten material in the needle tube flows more smoothly. The setting of the ball bearings transforms the original sliding friction between the positioning block and the needle body into rolling friction, reducing the wear of the positioning block on the needle body and thus improving the service life of the needle body. Attached Figure Description

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0017] Figure 2 This is a cross-sectional three-dimensional structural diagram of the present invention.

[0018] Figure 3 for Figure 2 A schematic diagram of the frontal planar structure.

[0019] Figure 4 for Figure 2 Enlarged view of point A in the middle.

[0020] Figure 5 This is a schematic diagram of the structure of this utility model.

[0021] In the diagram: 1. Valve needle body; 2. Base support; 3. Needle tube; 4. Needle body; 5. Cavity; 6. Oil cylinder; 7. Needle hole; 8. Guide chamber one; 9. Guide chamber two; 10. Merging chamber; 11. Interface; 12. Keyway; 13. Positioning block; 14. Through hole; 15. Ball bearing. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0024] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0025] Example 1

[0026] Please see Figure 1-5 The present invention provides the following technical solution:

[0027] Specifically, it refers to a valve needle structure: including a valve needle body 1, which is composed of a base 2 and a needle tube 3. The bottom surface of the needle tube 3 is fitted with the top surface of the base 2. A cavity 5 is provided inside the base 2. A guide cavity 8 located outside the cavity 5 is symmetrically provided inside the base 2. A hydraulic cylinder 6 is provided inside the cavity 5. A needle body 4 extending into the needle tube 3 is provided at the output end of the hydraulic cylinder 6. A guide cavity 9 located outside the needle body 4 and connected to the guide cavity 8 is symmetrically provided inside the needle tube 3. Both guide cavities 8 and 9 are arranged in an arc-shaped V-shape. A confluence cavity 10 connected to the two guide cavities 9 is provided inside the needle tube 3. An interface 11 is provided on the bottom surface of the base 2. The lower ends of the two guide cavities 8 converge and are connected to the interface 11. A needle hole 7 matching the needle body 4 is provided at the top of the needle tube 3. A positioning block 13 that slides in contact with the outer wall of the needle body 4 is symmetrically fixed to the inner wall of the confluence cavity 10.

[0028] The specific application of this embodiment is as follows: When the valve needle body 1 is injected with molten material from the interface 11, the molten material is diverted from the first guide chamber 8 and the second guide chamber 9 to the confluence chamber 10 and then merged. Through the coordinated use of the first guide chamber 8 and the second guide chamber 9, the flow rate of the molten material is increased, the flow speed of the molten material is accelerated, and the heat loss of the molten material is reduced, thereby improving the quality of injection molding. The cylinder 6 drives the needle body 4 to move up or down to seal and open the needle hole 7 on the needle tube 3, thereby controlling the state of the molten material being ejected or closed from the needle tube 3. The positioning block 13 set on the inner wall of the mixing chamber 10 ensures that the needle body 4 always moves in a vertical direction, avoiding the needle body 4 from deviating, which would cause damage to the needle hole 7 on the needle tube 3, thereby causing damage to the valve needle body 1.

[0029] Example 2

[0030] Please see Figure 1-5This embodiment 2 is an improvement on the first embodiment as follows: Specifically, the outer side wall of the top end of the needle body 4 is evenly provided with a plurality of smooth keyways 12, the opposite side walls of the two positioning blocks 13 are both arc-shaped, the opposite side walls of the positioning blocks 13 are provided with a plurality of rotatable balls 15, and the top surface of the two positioning blocks 13 is provided with a plurality of through holes 14.

[0031] One specific application of this embodiment is as follows: the keyway 12 on the needle body 4 increases the distance between the outer wall of the needle body 4 near the top and the confluence cavity 10 during the downward movement of the needle body 4, thereby increasing the amount of molten material ejected and improving the injection molding effect; the arc-shaped positioning block 13 makes the positioning block 13 fit better with the needle body 4; the multiple through holes 14 make the molten material flow more smoothly in the needle tube 3; and the ball bearings 15 change the sliding friction between the positioning block 13 and the needle body 4 into rolling friction, reducing the wear of the positioning block 13 on the needle body 4 and thus improving the service life of the needle body 4.

[0032] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0033] 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.

[0034] 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.

[0035] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0036] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A valve needle structure, characterized in that: Includes a valve needle body (1), which is composed of a base (2) and a needle tube (3). The bottom surface of the needle tube (3) fits with the top surface of the base (2). A cavity (5) is provided inside the base (2). A guide cavity (8) located outside the cavity (5) is symmetrically provided inside the base (2). A hydraulic cylinder (6) is provided inside the cavity (5). A needle body (4) extending into the needle tube (3) is provided at the output end of the hydraulic cylinder (6). 3) The needle tube (3) has a symmetrically arranged guide cavity 2 (9) located outside the needle body (4) and connected to the guide cavity 1 (8). The needle tube (3) has a confluence cavity (10) connected to the two guide cavities 2 (9). The bottom surface of the base (2) is provided with an interface (11). The top of the needle tube (3) is provided with a needle hole (7) that matches the needle body (4). The inner wall of the confluence cavity (10) is symmetrically fixedly connected with a positioning block (13) that slides in contact with the outer wall of the needle body (4).

2. The valve needle structure according to claim 1, characterized in that: Both of the material guide chambers 1 (8) and 2 (9) are arranged in an arc-shaped V-shape.

3. The valve needle structure according to claim 1, characterized in that: The lower ends of the two feed chambers (8) converge and are connected to the interface (11).

4. The valve needle structure according to claim 1, characterized in that: The outer side wall of the top end of the needle body (4) is uniformly provided with multiple smooth keyways (12).

5. A valve needle structure according to claim 1, characterized in that: The opposite sidewalls of the two positioning blocks (13) are both arc-shaped.

6. The valve needle structure according to claim 1, characterized in that: Each of the two positioning blocks (13) has a plurality of rotatable balls (15) on one of their opposite sidewalls.

7. A valve needle structure according to claim 1, characterized in that: Multiple through holes (14) are provided on the top surface of both positioning blocks (13).

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