Return self-sealing type spring nozzle

Abstract

The invention 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 injection nozzle does not need to be externally connected with any power source or signal source, the salivation phenomenon of the injection nozzle can be controlled only through advancing and retreating actions of the injection nozzle of the injection molding machine, and the injection nozzle 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 injection nozzle.

Description

Technical Field

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

[0002] Injection molding is an important part of modern industry. In injection molding production, sometimes in order to improve production efficiency and shorten cycle time, the operation of simultaneous melting of the mold while opening the mold is adopted, that is, the process of melting the glue while opening the mold is adopted. When the injection molding machine is unloading and melting the glue, back pressure is used to expel the air and compact the material. However, after the mold is opened, the mold inlet and the nozzle will be connected. When the glue is melted in the material tube, back pressure will be generated, which will cause the plastic to flow out of the nozzle into the front mold, resulting in cold material phenomenon, resulting in product defects such as cold material marks, silver wires, and water marks.

[0003] Therefore, there is a need in the art for a nozzle that can prevent drooling to solve the problem of drooling of plastic during synchronous melting of mold opening. Summary of the invention

[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, this 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 connected to the material pipe;

[0008] Middle body: coaxially fixed at 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 passage connected to the glue passage is provided in the middle of the valve needle, and 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 of the valve needle, and an injection channel which is interlinked with the glue passage in the valve needle is arranged 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 (external force comes from the material pipe), the middle body is driven to move 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 feeding channel, the glue passing 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 is separated from the mold glue inlet, the spring pushes the sub-nozzle and the valve needle to move forward, and the middle body remains motionless until the two sealing surfaces fit together and the feed channel is blocked again, 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 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 increases from the front end to the tail end.

[0014] In an implementation 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 inlet channels are provided in the middle part of the sliding part, all of the glue inlet channels are connected through the glue passage and the outer side of the sliding part, and 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 grinded together, that is, relative movement can occur between the two, but the colloid cannot leak from 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 an implementation of the first aspect, a front end outer wall of the sliding portion is provided with a connecting screw thread, and the sliding portion is fixed to the rear end axial center position of the sub-nozzle through the connecting screw thread.

[0018] In an implementation manner 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 a connecting thread.

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

[0020] Compared with the prior art, the present invention has the following beneficial effects:

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

[0022] (2) The present invention 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 sealing in Example 1;

[0025] Figure 2 is a schematic diagram of the structure of the valve needle in Example 1;

[0026] Figure 3 is a schematic structural diagram of the flange connection body in Example 1;

[0027] Figure 4 is a schematic diagram of the structure of the middle body in Example 1;

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

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

[0030] In the accompanying drawings, 1 is a heating coil, 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 thread, 12 is a first chamber, 13 is a second chamber, 14 is a third chamber, 15 is a connecting screw thread, 16 is a wedge-shaped channel, 17 is a sliding hole, 18 is a connecting screw thread, 19 is a sliding portion, and 20 is a sealing portion. DETAILED DESCRIPTION

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

[0032] The specific embodiments of the present invention will be described below. It should be noted that in the specific description of these embodiments, for the sake of concise description, it is impossible for this specification to describe all the features of the actual embodiments in detail. Without departing from the spirit and scope of the present invention, those skilled in the art may modify and replace the embodiments of the present invention, and the resulting embodiments are also within the scope of protection of the present invention.

[0033] Example

[0034] The embodiments of the present invention will be described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0035] Example 1

[0036] A return self-sealing spring nozzle, the structure of which is as follows Figure 1 As shown, it includes flange connection body 7, middle body 2, valve needle 4, sub-nozzle 6, spring 5 and heating coil 1, and 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 part 19 with a cylindrical front end and a sealing part 20 with a gyro shape at the rear end, wherein a glue passage 8 is provided at the axis center of the front end of the sliding part 19 along its axial direction, and a plurality of glue inlet channels 9 are provided in the middle of the sliding part 19, and all the glue inlet channels 9 are connected to the glue passage 8 and the outer side of the sliding part 19, and a wedge-shaped sealing surface 3 is provided at the contact position between the front end of the sealing part 20 and the sliding part 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 connection body 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 with the front end of the material tube. Of course, the flange connection method can also be used to fix with the front end of the material tube, 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, wherein the first chamber 12 and the channel at the axis of the material tube are connected to each other, the second chamber 13 is mainly used for glue and accommodating the sealing part 20, and 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 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 in sequence. The inner diameter of the sliding hole 17 is fixed and matches the outer diameter of the sliding part 19, and the inner diameter of the wedge-shaped channel 16 gradually expands from the front end to the tail end to form a wedge shape, and can fit tightly with the sealing surface 3 of the sealing part 20.

[0040] The structure of the sub-shooting nozzle 6 is as follows Figure 5 As shown, an injection channel 10 is provided at its axis, which is interlinked with the glue passage 8 in the valve needle 4. The tail end of the sub-injection 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. The outer walls of the sub-nozzle 6 and the flange connection body 7 are both provided with a heating ring 1.

[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 a 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 to form 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 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 inlet channel 9, the glue passage 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 to facilitate those of ordinary skill in the art to understand and apply the present application. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without having to pay creative labor. Therefore, the present application is not limited to the embodiments herein, and improvements and modifications made by those skilled in the art based on the contents disclosed in the present application without departing from the scope and spirit of the present application are within the scope of the present 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 connected to the material pipe; Middle body: coaxially fixed at 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 passage connected to the glue passage is provided in the middle of the valve needle, and 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 of the valve needle, and an injection channel which is interlinked with the glue passage in the valve needle is arranged 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 increases 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 feeding passages are provided in the middle of the sliding part, and all the glue feeding passages are connected to the glue passage and the outer side of the sliding part, and 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 connecting screw teeth, and the sliding part is fixed on the rear end axis position of the sub-nozzle through the connecting screw teeth.

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 threads.

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

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