Square valve needle glue sealing hot nozzle structure for injection mold

Abstract

The utility model discloses a square valve needle glue sealing hot nozzle structure for an injection mold, which comprises an air cylinder, the output end of the air cylinder is fixedly connected with a valve needle, one end of the valve needle far away from the air cylinder is provided with a square valve needle head, the outer surface of the square valve needle head is inserted with a nozzle core, and the square valve needle head extends out of one end of the nozzle core; according to the utility model, after the glue injection of the plastic mold is finished, the air cylinder starts to operate, the valve needle starts to do up-and-down linear motion under the driving of the air cylinder, and meanwhile, the square valve needle head is driven to stretch out and draw back in the nozzle core; the stability and the accuracy of vertical movement of the square valve needle head are ensured, the square valve needle head closes a sprue for glue sealing at the moment, so that glue injection of a plastic mold is completed, meanwhile, the square valve needle head can better meet the product injection molding requirement, traces at the sprue are reduced as much as possible, the appearance of an injection molding product is more attractive, and the attractiveness of the product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hot runners, in particular to a square valve needle sealing hot nozzle structure for an injection mold. Background Art

[0002] The valve needle is a key component in the needle valve hot runner system, which is mainly used to control the flow of plastic melt in the mold.

[0003] The main popular valve needle sealing methods on the market are slope sealing and vertical sealing. However, the slope sealing and vertical sealing ports are round, which sometimes cannot meet the sealing requirements well, especially for some plastic products with high requirements on size and appearance, and the glue entry point is on the surface or bone of long strip products. Square valve needles can better meet the production requirements of products.

[0004] Therefore, we provide a square valve needle sealing hot nozzle structure for an injection mold. Utility Model Content

[0005] The purpose of the utility model is to provide a square valve needle sealing hot nozzle structure for an injection mold to achieve the effects of aesthetics and practicality in view of the above-mentioned technical problems.

[0006] In view of this, the utility model provides a square valve needle sealing hot nozzle structure for an injection mold, comprising a cylinder, a valve needle is fixedly connected to the output end of the cylinder, a square valve needle head is installed at one end of the valve needle away from the cylinder, a nozzle core is inserted into the outer surface of the square valve needle head, and the square valve needle head extends out of one end of the nozzle core.

[0007] Preferably, a plurality of return grooves are provided on the outer surface of one end of the valve needle close to the square valve needle head, and the return grooves are evenly distributed at corresponding positions.

[0008] Preferably, the inner end surface of the cylinder is fixedly connected to a limiting column, the cylinder output end is inserted into the limiting column, and the valve needle slides and extends out of the limiting column, at least two sliding limiting grooves are opened inside the limiting column, and the two sliding limiting grooves are distributed in corresponding positions.

[0009] Preferably, at least two limit blocks are installed on the outer surface of the valve needle, and the two limit blocks slide inside the sliding limit groove.

[0010] Preferably, a diverter plate is installed at one end of the limiting column away from the cylinder, and the limiting column extends to the inside of the diverter plate.

[0011] Preferably, the diverter plate is plugged with a hot nozzle, the hot nozzle extends into the interior of the diverter plate, and one end of the hot nozzle is screwed and connected to the nozzle core.

[0012] Preferably, a mold core is installed at one end of the hot nozzle, and a diverter groove is opened inside the mold core.

[0013] Compared with the prior art, the utility model provides a square valve needle sealing hot nozzle structure for injection molds, which has the following beneficial effects:

[0014] 1. In the utility model, when the square valve needle moves to the opening position of the nozzle core, the valve needle and the nozzle core are closely fitted to ensure the stability and accuracy of the up and down movement of the square valve needle head. At this time, the square valve needle head will close the gate to seal the glue, thereby completing the injection of the plastic mold. At the same time, the square valve needle head can better meet the product injection requirements, minimize the marks at the gate, make the appearance of the injection molded product more beautiful, and improve the aesthetics of the product.

[0015] 2. In the utility model, when the square valve needle closes the gate, the return groove provides a channel so that part of the residual material can be returned to the flow channel through the return groove, thereby avoiding the accumulation of residual material at the gate and ensuring the smooth progress of the injection molding process.

[0016] 3. In the utility model, when the valve needle moves up and down, the stability of the valve needle's up and down movement is ensured under the guidance and limitation of the limit block and the sliding limit groove, thereby limiting the square valve needle head and ensuring that the square valve needle head will not deviate during movement.

[0017] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. The utility model has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a square valve needle sealing hot nozzle structure for an injection mold proposed by the utility model;

[0019] Figure 2 A schematic diagram of a valve needle limiting structure of a square valve needle sealing hot nozzle structure for an injection mold proposed by the utility model;

[0020] Figure 3 This is a schematic diagram of the return trough structure of a square valve needle sealing hot nozzle structure for an injection mold proposed by the utility model;

[0021] Figure 4 The utility model discloses a square valve needle head sealing structure of a square valve needle sealing hot nozzle structure for an injection mold.

[0022] Figure 5 The utility model provides a schematic diagram of the large-scale structure of a square valve needle head with a square valve needle sealing hot nozzle structure for an injection mold.

[0023] In the figure: 1. Cylinder; 2. Diverter plate; 3. Hot nozzle; 4. Valve needle; 5. Mold core; 6. Nozzle core; 7. Square valve needle head; 8. Limit block; 9. Return trough; 12. Limit column; 13. Sliding limit groove; 14. Diverter groove. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0026] Embodiment 1: A square valve needle sealing hot nozzle structure for an injection mold, such as Figure 1-Figure 5 As shown, it includes a cylinder 1, a valve needle 4 is fixedly connected to the output end of the cylinder 1, a square valve needle head 7 is installed at the end of the valve needle 4 away from the cylinder 1, a nozzle core 6 is inserted into the outer surface of the square valve needle head 7, and the square valve needle head 7 extends out of one end of the nozzle core 6.

[0027] When the plastic mold is injected with glue, the cylinder 1 starts to run. Driven by the cylinder 1, the valve needle 4 starts to make a straight line movement up and down, and at the same time drives the square valve needle head 7 to expand and contract inside the nozzle core 6. When the square valve needle head 7 moves to the opening position of the nozzle core 6, based on the close fit between the valve needle 4 and the nozzle core 6, the stability and accuracy of the up and down movement of the square valve needle head 7 are guaranteed. At this time, the square valve needle head 7 will close the gate for sealing, thereby completing the plastic mold injection. At the same time, the square valve needle head 7 can better meet the product injection requirements, minimize the marks at the gate, make the appearance of the injection molded product more beautiful, and improve the aesthetics of the product.

[0028] like Figure 1-Figure 5 As shown, a plurality of return grooves 9 are provided on the outer surface of one end of the valve needle 4 close to the square valve needle head 7, and the return grooves 9 are evenly distributed at corresponding positions.

[0029] When the square valve needle head 7 closes the gate, the return groove 9 provides a channel so that part of the residual material can be returned to the runner through the return groove, avoiding the accumulation of residual material at the gate and ensuring the smooth progress of the injection molding process. At the same time, the return groove can help the plastic melt to better fill the sealing area when the valve needle closes the gate, thereby improving the sealing performance.

[0030] like Figure 1-Figure 5 As shown, the inner end surface of the cylinder 1 is fixedly connected to a limiting column 12, the output end of the cylinder 1 is inserted into the limiting column 12, and the valve needle 4 slides and extends out of the limiting column 12. At least two sliding limiting grooves 13 are opened inside the limiting column 12, and the two sliding limiting grooves 13 are distributed in corresponding positions.

[0031] At least two limit blocks 8 are installed on the outer surface of the valve needle 4 , and the two limit blocks 8 slide inside the sliding limit groove 13 .

[0032] When the valve needle 4 moves up and down, the stability of the up and down movement of the valve needle 4 is ensured under the guidance and limitation of the limit block 8 and the sliding limit groove 13, thereby limiting the square valve needle head 7 and ensuring that the square valve needle head 7 does not deviate during movement.

[0033] Embodiment 2: A square valve needle sealing hot nozzle structure for an injection mold, such as Figure 1-Figure 5 As shown, a splitter plate 2 is installed at one end of the limiting column 12 away from the cylinder 1 , and the limiting column 12 extends to the inside of the splitter plate 2 .

[0034] The manifold plate 2 is plugged with a hot nozzle 3, which extends into the interior of the manifold plate 2, and one end of the hot nozzle 3 is screwed and connected to the nozzle core 6.

[0035] A mold core 5 is installed at one end of the hot nozzle 3, and a diverter groove 14 is opened inside the mold core 5.

[0036] When the device is running, the plastic flows into the hot nozzle 3 through the diverter plate 2. During the continuous heating process of the hot nozzle 3, the fluidity of the plastic is guaranteed. Then the heated plastic flows into the mold core 5 through the nozzle core 6. The plastic in the mold core 5 is injected to both sides along the diverter groove 14 at the same time, which can better fill the mold. The hot nozzle 3 is threadedly connected to the nozzle core 6, which is convenient for later replacement.

[0037] Working principle: When the device is running, the plastic flows into the hot nozzle 3 through the diverter plate 2. During the continuous heating process of the hot nozzle 3, the fluidity of the plastic is guaranteed. Then the heated plastic will flow into the mold core 5 through the nozzle core 6. The plastic will be injected to both sides of the mold core 5 along the diverter groove 14. When the injection of the plastic mold is completed, the cylinder 1 starts to run. Driven by the cylinder 1, the valve needle 4 starts to move up and down in a straight line, and at the same time drives the square valve needle head 7 to retract and contract inside the nozzle core 6. When the square valve needle head 7 moves to the opening position of the nozzle core 6, the square valve needle head 7 will close the gate for sealing, thereby completing the injection of the plastic mold. At this time, the square valve needle head 7 will close the gate for sealing, thereby completing the injection of the plastic mold.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A square valve needle sealing hot nozzle structure for an injection mold, comprising a cylinder (1), characterized in that: The output end of the cylinder (1) is fixedly connected to a valve needle (4), and the end of the valve needle (4) away from the cylinder (1) is equipped with a square valve needle head (7), the outer surface of the square valve needle head (7) is plugged with a nozzle core (6), and the square valve needle head (7) extends out of one end of the nozzle core (6).

2. A square valve needle sealing hot nozzle structure for injection mold according to claim 1, characterized in that: A plurality of return grooves (9) are provided on the outer surface of one end of the valve needle (4) close to the square valve needle head (7), and the return grooves (9) are evenly distributed at corresponding positions.

3. The square valve needle sealing hot nozzle structure for injection mold according to claim 1, characterized in that: The inner end surface of the cylinder (1) is fixedly connected to a limit column (12), the output end of the cylinder (1) is inserted into the interior of the limit column (12), and the valve needle (4) slides and extends out of the interior of the limit column (12), and at least two sliding limit grooves (13) are provided inside the limit column (12), and the two sliding limit grooves (13) are distributed at corresponding positions.

4. A square valve needle sealing hot nozzle structure for injection mold according to claim 3, characterized in that: At least two limit blocks (8) are installed on the outer surface of the valve needle (4), and the two limit blocks (8) slide inside the sliding limit groove (13).

5. The square valve needle sealing hot nozzle structure for injection mold according to claim 3, characterized in that: A flow dividing plate (2) is installed at one end of the limiting column (12) away from the cylinder (1), and the limiting column (12) extends into the interior of the flow dividing plate (2).

6. A square valve needle sealing hot nozzle structure for injection mold according to claim 5, characterized in that: The diverter plate (2) is plugged with a hot nozzle (3), the hot nozzle (3) extends into the interior of the diverter plate (2), and one end of the hot nozzle (3) is threadedly screwed to the nozzle core (6).

7. A square valve needle sealing hot nozzle structure for injection mold according to claim 6, characterized in that: A mold core (5) is installed at one end of the hot nozzle (3), and a diversion groove (14) is opened inside the mold core (5).

Images