Needle valve type hot nozzle

Abstract

The utility model provides a needle valve type hot nozzle which comprises a lining, at least one hot runner is arranged in the lining, and an injection head is connected to the lower end of the lining in an embedded mode; an injection channel is arranged in the injection head; a containing groove communicated with the injection channel is further formed in the lining. A valve needle is movably arranged in the injection channel and the containing groove, and a valve head with the caliber matched with that of the containing groove is arranged at the upper end of the valve needle. A pneumatic connector communicated with the containing groove is arranged outside the lining. In the injection molding period, the valve structure is used for controlling the injection molding process, an injection machine does not need to stop, the workpiece forming period is effectively shortened, and the production efficiency is greatly improved; by accurately controlling injection molding, defective products are reduced, and the attractiveness and quality of products are improved; meanwhile, plastic raw materials and labor cost are saved, follow-up procedures are eliminated, production automation is facilitated, the application range of the injection molding technology is expanded, the cost performance of the mold is improved, and then the competitive capacity of enterprises is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection mold, in particular to a needle valve type hot nozzle. BACKGROUND

[0002] Injection molding is a method of producing shapes of industrial products. Products are usually made of rubber injection molding and plastic injection molding. Injection molding machine (referred to as injection machine or injection molding machine) is the main molding equipment for making various shapes of plastic products by using thermoplastic or thermosetting material and plastic molding mold. Injection molding is realized by injection molding machine and mold.

[0003] The current injection mold does not have a switch function when injecting, and can only rely on the start and stop of the injection machine to control, which is low in efficiency, and needs to be restarted to adjust the pressure when the injection machine injects the next mold. In addition, it is not conducive to energy saving, and in the start and stop process, not only the energy consumption is increased, but also the processing progress is slowed down. Therefore, the utility model provides a needle valve type hot nozzle to at least partially solve the problems in the prior art. CONTENT OF THE UTILITY MODEL

[0004] In view of the problems, the present application is proposed to provide a needle valve type hot nozzle to overcome the problems or at least partially solve the problems, comprising:

[0005] A bushing is provided with at least one hot runner inside, and the lower end of the bushing is embedded with an injection head;

[0006] The bushing is also provided with a containing groove in communication with the injection channel;

[0007] The injection channel and the containing groove are movably provided with a valve needle, and the upper end of the valve needle is provided with a valve head with a caliber matched with the containing groove;

[0008] The bushing is provided with a pneumatic interface in communication with the containing groove;

[0009] When the valve needle is located at the first position, the hot runner is in communication with the injection channel; when the valve needle is located at the second position, the hot runner is not in communication with the injection channel.

[0010] Optionally, a heating wire is wound around the injection head;

[0011] The bushing is provided with a wire electrically connected to the heating wire.

[0012] Optionally, the injection head is provided with a spiral groove, and the heating wire is arranged in the spiral groove;

[0013] The wire is externally sleeved with a heat-resistant insulating tube.

[0014] Optionally, the injection head is made of copper.

[0015] Optionally, the upper end of the bushing is provided with a spherical recess, and the bottom of the spherical recess is communicated with the hot runner.

[0016] Optionally, the bushing is made of stainless steel material.

[0017] The present application has the following advantages:

[0018] In the embodiment of the present application, a bushing is provided, at least one hot runner is arranged in the bushing, and an injection head is embedded and connected at the lower end of the bushing; an injection channel is arranged in the injection head; a containing groove communicated with the injection channel is further arranged in the bushing; a valve needle is movably arranged in the injection channel and the containing groove, and a valve head with a caliber matched with the containing groove is arranged at the upper end of the valve needle; a pneumatic interface communicated with the containing groove is arranged outside the bushing; when the valve needle is located at a first position, the hot runner is communicated with the injection channel; when the valve needle is located at a second position, the hot runner is not communicated with the injection channel. In the injection molding cycle, the injection molding process is controlled by using the valve structure, the injection machine does not need to be stopped, the forming cycle of the product is effectively shortened, and the production efficiency is greatly improved; by precisely controlling the injection molding, the generation of defective products is reduced, and the appearance and quality of the product are improved; at the same time, the plastic raw materials and labor costs are saved, the subsequent processes are eliminated, the production automation is beneficial, the application range of the injection molding process is expanded, the cost performance of the mold is improved, and the enterprise competitiveness is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the present application will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and all other embodiments obtained by those skilled in the art without creative labor on the basis of these drawings also belong to the protection scope of the present application.

[0020] Figure 1 is a cross-sectional structure schematic diagram of a needle valve type hot nozzle provided by an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below in combination with the drawings and specific embodiments. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor also belong to the protection scope of the present application.

[0022] REFERENCE Figure 1, shows a needle valve hot nozzle provided by the embodiment of the application, which comprises a bushing 101, at least one hot runner 104 is arranged in the bushing 101, and an injection head 102 is embedded and connected to the lower end of the bushing 101; the injection head 102 is provided with an injection channel 105; the bushing 101 is further provided with a containing groove 103 which is in communication with the injection channel 105; a valve needle 107 is movably arranged in the injection channel 105 and the containing groove 103, and a valve head 106 with a caliber matched with the containing groove 103 is arranged at the upper end of the valve needle 107; the bushing 101 is provided with a pneumatic interface 110 which is in communication with the containing groove 103; when the valve needle 107 is located at a first position, the hot runner 104 is in communication with the injection channel 105; when the valve needle 107 is located at a second position, the hot runner 104 is not in communication with the injection channel 105.

[0023] When working, the valve needle 107 and the valve head 106 form a cylinder structure in the bushing 101, and the injection machine will give an injection signal when injecting plastic, the cylinder will retreat the valve needle, the needle valve hot nozzle (single-hole needle valve hot nozzle) retreats the valve needle to the first position, which is equivalent to opening the needle valve hot nozzle, at this time, the valve needle 107 is opened, and the plastic is injected; when the injection machine completes the injection molding cycle, a stop injection signal is given, the hot nozzle cylinder will push the valve needle 107 forward through the reverse air supply of the pneumatic interface 110, and the valve needle seals the glue outlet, and the valve needle seals the plastic. Through the valve structure of the needle valve hot nozzle (valve gate) in the injection molding cycle, the injection molding process is controlled, the injection machine does not need to stop in the working cycle, which not only shortens the forming cycle of the product, improves the production efficiency, reduces defective products, improves the appearance and quality of the product, saves the cost of plastic raw materials and labor, eliminates the subsequent process, is conducive to production automation, can expand the application range of injection molding process, improve the performance-price ratio of the mold, and improve the competitiveness of the enterprise.

[0024] In the following, one needle valve hot nozzle in the various exemplary embodiments of the application will be further described.

[0025] In the embodiment of the present application, a needle valve hot nozzle is provided, wherein the injection head 102 is provided with a heating wire 108, and the bushing 101 is provided with a wire 111 electrically connected to the heating wire 108. The heating wire 108 can prevent the molten plastic from solidifying or losing fluidity due to temperature drop during injection, thereby affecting the quality of injection. During injection, the needle valve hot nozzle is heated by the heating element (the heating wire 108), the electromagnetic valve (not shown in the figure) is opened, the needle valve 107 is opened by the cylinder, the plastic melt is injected into the mold cavity, until the mold cavity is filled with the plastic melt, the plastic product is completely formed, the pressure in the mold is reduced as the melt is cooled and shrunk, the electromagnetic valve is closed, the needle valve is automatically closed under the action of the cylinder, and the injection of the melt is stopped. The process is repeated for one production cycle. The needle valve hot nozzle can save plastic, shorten the molding cycle, reduce production cost, and improve efficiency during operation.

[0026] Further, the injection head 102 is provided with a spiral groove, and the heating wire 108 is arranged in the spiral groove. The wire 111 is externally provided with a heat-resistant insulating tube.

[0027] As an example, the needle valve hot nozzle is a single-hole needle valve hot nozzle, and the VG type is a needle valve hot nozzle (valve gate) hot nozzle. The injection pressure loss is small, the plastic fluidity is good, and the needle valve hot nozzle is suitable for products of different sizes and plastics containing additives or GF. The needle valve hot nozzle is suitable for plastic factories, has no residual stress problem, has small gate marks between injection points, and has a beautiful appearance. The needle valve hot nozzle can control the use of multiple holes at different times, simultaneously or sequentially. The hot runner of the needle valve hot nozzle can save plastic, shorten the molding cycle, reduce production cost, and improve the efficiency of the system.

[0028] In the embodiment of the present application, the injection head 102 is made of copper. The upper end of the bushing 101 is provided with a spherical recess 109, and the bottom of the spherical recess 109 is in communication with the hot runner 104. The spherical recess 109 can provide a larger contact surface when connected to the injection molding machine, so that the injection molding machine can be better connected to the injection port during injection.

[0029] In the embodiment of the present application, the bushing 101 is made of stainless steel. The needle valve hot nozzle can reduce material loss and easily realize automatic injection processing. The bushing 101 can be processed according to the shape of the mold and the requirements of the product. Various plastic products such as traffic equipment, bumpers, automobile door panels, car lights, computers, electrical appliances, electronic products, household appliances, food containers, and molding require attention to the cooling water path beside the gate to facilitate the control of the mold temperature around the gate. The V-shaped hot nozzle can realize high-efficiency processing. The needle valve hot nozzle can greatly save plastic, shorten the molding cycle, reduce production cost, improve efficiency, improve the cost performance of the mold, and improve the competitiveness of the enterprise.

[0030] Although the preferred embodiments of the application have been described, those skilled in the art will be able to make additional modifications and variations to these embodiments without departing from the scope of the application. Accordingly, it is intended to embrace all such future modifications and variations as fall within the scope of the application.

[0031] Finally, it is to be understood that the phraseology or terminology employed herein, such as "first" and "second", etc., are for descriptive purposes only and should not be construed to connote or otherwise imply any kind of ordering, precedence or relationships between or among the elements or operations so described. Moreover, the terms "comprising", "including", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a... " does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0032] The needle valve type hot nozzle provided by the application is described in detail above, and the principles and implementation manners of the application are described by using specific examples. The above description of the embodiments is only used to help understand the method of the application and its core idea; meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the application. In conclusion, the content of the specification should not be understood as a limitation of the application.

Claims

1. A needle valve type hot nozzle, characterized in that, include: A bushing having at least one hot runner channel inside, with an injection head embedded at its lower end; the injection head having an injection channel inside. The bushing is also provided with a receiving groove that communicates with the injection channel; A valve needle is movably disposed within the injection channel and the receiving groove, and a valve head with a diameter adapted to the receiving groove is provided at the upper end of the valve needle. The bushing is provided with a pneumatic interface that communicates with the receiving groove. Specifically, when the valve needle is in the first position, the hot runner is connected to the injection channel; when the valve needle is in the second position, the hot runner is not connected to the injection channel.

2. The needle valve type hot nozzle according to claim 1, characterized in that, A heating wire is wound around the injection head; The bushing is provided with wires that are electrically connected to the heating wire.

3. The needle valve type hot nozzle according to claim 2, characterized in that, The injection head is provided with a spiral groove, and the heating wire is disposed in the spiral groove; The conductor is covered with a heat-resistant insulating tube.

4. The needle valve type hot nozzle according to claim 2, characterized in that, The injection head is made of copper.

5. The needle valve type hot nozzle according to claim 1, characterized in that, The upper end of the bushing is provided with a spherical recess, and the bottom of the spherical recess is connected to the hot runner.

6. The needle valve type hot nozzle according to claim 1, characterized in that, The bushing is made of stainless steel.

Images