Return self-sealing type spring nozzle

Abstract

The utility model relates to a return self-sealing type spring nozzle which comprises a flange connecting body, a piston rod, a piston rod, a piston rod, a piston rod, a piston rod, a piston rod, a piston rod and a piston rod, the middle body is coaxially fixed at the front end of the flange connecting body; the tail end of the valve needle is inserted into the middle body and the flange connecting body, a glue passing channel is formed in the axis of the front end of the valve needle, a glue inlet channel communicated with the glue passing channel is formed in the middle of the valve needle, and a glue sealing face is arranged between the tail end of the valve needle and the middle body; the sub-nozzle is fixedly arranged at the top end of the valve needle, and an injection channel communicated with the glue passing channel in the valve needle is arranged at the axis of the sub-nozzle; and the spring is arranged outside the valve needle in a sleeving manner, the front end of the spring abuts against the tail end of the sub-nozzle, and the tail end of the spring abuts against the front end of the middle body. The device does not need to be externally connected with any power source and signal source, can control the salivation phenomenon of the nozzle only by utilizing the advancing and retreating actions of the nozzle of the injection molding machine, is high in practicability, low in failure rate and low in price, and is a high-quality choice for solving the glue leakage phenomenon of the nozzle.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, in particular to a return self-sealing spring nozzle. Background Art

[0002] Injection molding is a vital part of modern industry. To improve production efficiency and shorten cycle time, simultaneous mold opening and melt operation is sometimes employed. This involves melting the material while the mold is opening. During material melting, the injection molding machine utilizes back pressure to expel air and compact the material. However, once the mold is opened, the mold inlet and nozzle are connected. This creates back pressure as the material melts in the material pipe, causing plastic to flow out of the nozzle into the front mold, resulting in cold material. This can lead to product defects such as cold material marks, silver streaks, and water marks.

[0003] Therefore, there is a need in the art for a nozzle that can prevent drooling and solve the problem of drooling of plastic during synchronous melt molding. Utility Model Content

[0004] The purpose of the present invention is to provide a return self-sealing spring nozzle in order to overcome the defects of the prior art.

[0005] In order to achieve the purpose of the present invention, the present application provides the following technical solutions.

[0006] In a first aspect, the present application provides a return self-sealing spring nozzle, the spring nozzle comprising:

[0007] Flange connector: Its rear end is coaxially fixed to the front end of the material pipe and is connected to the material pipe;

[0008] Middle body: coaxially fixed to the front end of the flange connection body;

[0009] Valve needle: Its tail end is inserted into the middle body and the flange connection body. A glue passage is provided at the front axis of the valve needle. A glue inlet channel connected to the glue passage is provided in the middle of the valve needle. A glue sealing surface is provided between the tail end of the valve needle and the middle body.

[0010] Sub-nozzle: fixedly arranged at the top end of the valve needle, and an injection channel that is mutually connected with the glue passage in the valve needle is provided at the axis of the sub-nozzle;

[0011] Spring: sleeved on the outside of the valve needle, with the front end of the spring abutting against the rear end of the sub-nozzle, and the rear end of the spring abutting against the front end of the middle body.

[0012] When the flange connector moves forward under the action of external force (the external force comes from the material pipe), it drives the middle body forward together. Since the front end of the sub-nozzle is against the mold glue inlet and cannot move, the spring between the middle body and the sub-nozzle is gradually compressed. At the same time, since the valve needle and the sub-nozzle are fixed and remain motionless, the forward movement of the middle body will cause the glue sealing surface between the middle body and the valve needle to open, so that the molten glue can enter the glue feed channel, the glue channel and the injection channel in the sub-nozzle in turn to start injection molding. After the injection molding is completed, the main part of the nozzle retreats, the sub-nozzle separates from the mold glue inlet, the spring pushes the sub-nozzle and the valve needle forward, and the middle body remains motionless until the two glue sealing surfaces fit together and the feed channel is re-sealed, and glue leakage will not occur.

[0013] In one embodiment of the first aspect, an external thread is provided on the outer side of the tail end of the middle body, and a sliding hole and a wedge-shaped channel are provided at the axis center of the middle body. The sliding hole is located at the front end of the wedge-shaped channel, the inner diameter of the sliding hole is fixed, and the inner diameter of the wedge-shaped channel gradually expands from the front end to the tail end.

[0014] In one embodiment of the first aspect, the valve needle includes an integrally formed sliding portion and a sealing portion, wherein:

[0015] A glue passage is provided at the axis center of the front end of the sliding part along its axial direction, and a plurality of glue feed channels are provided in the middle part of the sliding part. All the glue feed channels are connected through the glue channel and the outside of the sliding part. The outer diameter of the sliding part is the same as the inner diameter of the sliding hole. The so-called same here means that the outer diameter of the sliding part and the sliding hole are ground together, that is, the two can move relative to each other, but the colloid cannot leak between the two, and the tolerance between the two is required to be very small.

[0016] A sealing surface matching the wedge-shaped channel is provided at a position where the front end of the sealing portion contacts the sliding portion.

[0017] In one embodiment of the first aspect, a connecting screw thread is provided on the front end outer wall of the sliding portion, and the sliding portion is fixed to the rear end axis position of the sub-nozzle through the connecting screw thread.

[0018] In one implementation of the first aspect, the middle body is coaxially fixed to the axial center position of the front end of the flange connection body through connecting threads.

[0019] In one embodiment of the first aspect, a heating ring is provided on the outer sides of the sub-nozzle and the flange connection body to keep the colloid in a molten state and prevent it from cooling and solidifying while waiting for injection.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] (1) Through the setting of the spring, the seat moves backward to support the valve needle, so that the sealing surface fits, achieving the anti-drooling function; when working, the seat moves forward to make the nozzle contact with the mold, press the nozzle to push the valve needle backward, open the sealing surface, and let the colloid enter the mold smoothly.

[0022] (2) The utility model does not require any external power source or signal source, and can control the occurrence of nozzle drooling by only utilizing the nozzle advance and retreat movement of the injection molding machine itself.

[0023] (3) It is highly practical, has a low failure rate, and is cheap, making it a good choice for solving the problem of nozzle leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the state of the nozzle during sealing in Example 1;

[0025] Figure 2 Schematic diagram of the structure of the valve needle in Example 1;

[0026] Figure 3 Schematic diagram of the structure of the flange connection body in Example 1;

[0027] Figure 4 Schematic diagram of the structure of the middle body in Example 1;

[0028] Figure 5 This is a schematic structural diagram of the neutron nozzle in Example 1;

[0029] Figure 6 This is a schematic diagram of the nozzle during injection molding in Example 1.

[0030] In the accompanying drawings, 1 is a heating ring, 2 is a middle body, 3 is a sealing surface, 4 is a valve needle, 5 is a spring, 6 is a sub-nozzle, 7 is a flange connector, 8 is a glue passage, 9 is a glue feed passage, 10 is an injection passage, 11 is a connecting screw, 12 is a first chamber, 13 is a second chamber, 14 is a third chamber, 15 is a connecting screw, 16 is a wedge-shaped channel, 17 is a sliding hole, 18 is a connecting screw, 19 is a sliding part, and 20 is a sealing part. DETAILED DESCRIPTION

[0031] Unless otherwise defined, technical or scientific terms used in this specification and claims shall have the ordinary meanings understood by persons having ordinary skill in the art to which this invention belongs. All numerical values ​​listed herein, from the lowest value to the highest value, refer to all numerical values ​​obtained by incrementing the lowest value to the highest value by one unit when the difference between the lowest value and the highest value is two units or more.

[0032] The following describes specific embodiments of the present invention. It should be noted that, in the context of describing these embodiments, for the sake of brevity and clarity, this specification does not exhaustively describe all features of the actual embodiments. Those skilled in the art may modify and replace the embodiments of the present invention without departing from the spirit and scope of the present invention, and the resulting embodiments are also within the scope of protection of the present invention.

[0033] Example

[0034] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. However, the protection scope of the present invention is not limited to the following embodiment.

[0035] Example 1

[0036] A return self-sealing spring nozzle, its structure is as follows Figure 1 As shown, it includes flange connector 7, middle body 2, valve needle 4, nozzle 6, spring 5 and heating coil 1. The specific structure of each component is as follows:

[0037] The structure of the valve needle 4 is as follows Figure 2 As shown, it comprises a sliding portion 19 with a cylindrical front end and a gyro-shaped sealing portion 20 with a gyro-shaped rear end. A glue passage 8 is provided along the axial direction at the axis center of the front end of the sliding portion 19. A plurality of glue feed channels 9 are provided in the middle of the sliding portion 19. All glue feed channels 9 connect the glue channel 8 and the outer side of the sliding portion 19. A wedge-shaped sealing surface 3 is provided at the contact position between the front end of the sealing portion 20 and the sliding portion 19. A connecting thread 11 is provided on the outer wall of the top end of the valve needle 4.

[0038] The structure of the flange connector 7 is as follows Figure 3 As shown, the side wall of the rear end of the flange connector 7 is provided with a connecting thread 15 for fixing to the front end of the material pipe. Of course, a flange connection method can also be used to fix to the front end of the material pipe, which is not given as an example in this embodiment. The axis of the flange connector 7 is provided with a first chamber 12, a second chamber 13 and a third chamber 14 from back to front. Among them, the first chamber 12 and the channel at the axis of the material pipe are connected to each other. The second chamber 13 is mainly used for glue passing and accommodating the sealing part 20. The third chamber 14 is mainly used to fix the middle body 2, so the inner wall of the third chamber 14 is provided with a thread.

[0039] The structure of midbody 2 is as follows Figure 4As shown, a connecting screw thread 18 (i.e., an external thread) is provided on the outer side of the tail end of the middle body 2, and a sliding hole 17 and a wedge-shaped channel 16 are provided at the axis of the middle body 2 from front to back. The inner diameter of the sliding hole 17 is fixed and matches the outer diameter of the sliding part 19. The inner diameter of the wedge-shaped channel 16 gradually expands from the front end to the tail end into a wedge shape, and can fit tightly with the sealing surface 3 of the sealing part 20.

[0040] The structure of the sub-nozzle 6 is as follows Figure 5 As shown, an injection channel 10 is provided at its axis, which is interconnected with the glue passage 8 in the valve needle 4. The tail end of the sub-nozzle 6 is fixedly arranged on the top of the valve needle 4, and the two are connected by screw threads.

[0041] The spring 5 is sleeved on the outside of the valve needle 4, and the two ends of the spring 5 are respectively in contact with the sub-nozzle 6 and the middle body 2. A heating ring 1 is provided on the outer wall of the sub-nozzle 6 and the flange connection body 7.

[0042] The working principle of the return self-sealing spring nozzle is as follows:

[0043] When there is no glue injection or the glue injection interval is in progress, the structure is as follows Figure 1 As shown, at this time, the spring 5 is in its natural state. The inner wall of the wedge-shaped channel 16 of the middle body 2 is in close contact with the sealing surface 3 of the valve needle 4, forming a sealing structure. After the colloid enters the first chamber 12 and the second chamber 13 of the flange connection body 7 from the material pipe, it can no longer flow forward.

[0044] When glue injection is required, the flange connector 7 moves forward under the action of external force (external force comes from the material pipe), driving the middle body 2 to move forward together. Since the front end of the sub-nozzle 6 is against the glue inlet of the mold and cannot move, the spring 5 located between the middle body 2 and the sub-nozzle 6 is gradually compressed. At the same time, since the valve needle 4 and the sub-nozzle 6 are fixed and remain motionless, the forward movement of the middle body 2 will open the glue sealing surface 3 between the middle body 2 and the valve needle 4, so that the molten glue can enter the first chamber 12, the second chamber 13, the glue feeding channel 9, the glue passing channel 8 and the injection channel 10 in the sub-nozzle 6 in sequence, as shown in FIG. Figure 6 As shown, start injection molding.

[0045] The above description of the embodiments is intended to facilitate understanding and application of the present application by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without expending any creative effort. Therefore, the present application is not limited to the embodiments described herein, and improvements and modifications made by those skilled in the art based on the disclosure of this application without departing from the scope and spirit of this application are within the scope of this application.

Claims

1. A return self-sealing spring nozzle, characterized in that: The spring nozzle comprises: Flange connector: Its rear end is coaxially fixed to the front end of the material pipe and is connected to the material pipe; Middle body: coaxially fixed to the front end of the flange connection body; Valve needle: Its tail end is inserted into the middle body and the flange connection body. A glue passage is provided at the front axis of the valve needle. A glue inlet channel connected to the glue passage is provided in the middle of the valve needle. A glue sealing surface is provided between the tail end of the valve needle and the middle body. Sub-nozzle: fixedly arranged at the top end of the valve needle, and an injection channel that is mutually connected with the glue passage in the valve needle is provided at the axis of the sub-nozzle; Spring: sleeved on the outside of the valve needle, with the front end of the spring abutting against the rear end of the sub-nozzle, and the rear end of the spring abutting against the front end of the middle body.

2. The return self-sealing spring nozzle according to claim 1, characterized in that: An external thread is provided on the outer side of the tail end of the middle body, and a sliding hole and a wedge-shaped channel are provided at the axis of the middle body. The sliding hole is located at the front end of the wedge-shaped channel, the inner diameter of the sliding hole is fixed, and the inner diameter of the wedge-shaped channel gradually expands from the front end to the tail end.

3. The return self-sealing spring nozzle according to claim 2, characterized in that: The valve needle includes an integrally formed sliding portion and a sealing portion, wherein: A glue passage is provided at the axis center of the front end of the sliding part along its axial direction, and a plurality of glue feed passages are provided in the middle of the sliding part. All the glue feed passages are connected to the glue passage and the outer side of the sliding part. The outer diameter of the sliding part is precisely ground to the inner diameter of the sliding hole. A sealing surface matching the wedge-shaped channel is provided at a position where the front end of the sealing portion contacts the sliding portion.

4. The return self-sealing spring nozzle according to claim 3, characterized in that: The front end outer wall of the sliding part is provided with a connecting screw thread, and the sliding part is fixed to the rear end axis position of the sub-nozzle through the connecting screw thread.

5. The return self-sealing spring nozzle according to claim 1, characterized in that: The middle body is coaxially fixed to the axial center position of the front end of the flange connection body through connecting screw threads.

6. The return self-sealing spring nozzle according to claim 1, characterized in that: A heating ring is provided on the outer sides of the sub-nozzle and the flange connection body.

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