CN218948333U - Needle valve type nozzle for injection molding machine - Google Patents

Abstract

The needle valve type nozzle for the injection molding machine comprises a main body, a valve needle, a nozzle head, a push rod, a spring assembly and an adapter head, wherein a first radial through channel is arranged in the main body in the vertical direction of the horizontal channel, a second horizontal through hole is further formed in the main body opposite to the horizontal through hole behind the first radial through channel, the push rod is arranged in the second horizontal through hole, the front end of the push rod props against the tail end of the valve needle, the tail end of the push rod props against the rod, the main body further comprises a second radial through channel behind the first radial through channel, the spring assembly comprises a shell, a spring and an annular piece, the spring is sleeved on the shell of the main body, the front end of the spring is provided with the annular piece and limited by the outer ring of the annular piece, the annular piece is sleeved on the shell of the main body and symmetrically provided with grooves, the rod is arranged in the second radial through channel, two ends of the rod are respectively embedded in the grooves, the outer shell is wrapped by the tail end of the spring, the tail end of the spring is limited by the shell or limited by the adapter head, when the nozzle is not used, the spring props against the needle valve to close the nozzle, and when the needle valve is used, the spring is moved to open.

Description

Needle valve type nozzle for injection molding machine

Technical Field

The present utility model relates to nozzles for injection molding machines, and in particular to needle valve nozzles.

Background

The needle valve type nozzle is widely used in injection molding, the existing needle valve type nozzle generally comprises an adapter head, a main body, a needle valve and a nozzle head, the adapter head, the main body and the nozzle head are provided with channels which are communicated in sequence, when the nozzle is arranged on a material pipe of an injection molding machine, the adapter head is communicated with the injection molding material pipe, the needle valve controls the opening and closing of the nozzle, and when the injection molding is performed, a screw rod pushes molten plastics in the injection molding material pipe to enter a mold for molding through the nozzle.

The existing needle valve type nozzle adopts an external spring to control the opening and closing of the nozzle through the needle valve, and the spring is directly exposed in the environment. Since springs are relatively failure-prone parts, in injection molding test environments, springs are susceptible to being covered by molten plastic, requiring cleaning, which would otherwise adversely affect the life of the springs, and plastic seeping from the tail of the nozzle needle into the working space of the springs, which would also adversely affect the same, there is a need for improved nozzle designs.

Disclosure of Invention

The utility model aims to solve the technical problem and provide a needle valve type nozzle for an injection molding machine, which is not easy to pollute and damage a spring.

The technical scheme adopted for solving the technical problems is as follows:

the needle valve type nozzle for the injection molding machine comprises a main body, a valve needle, a nozzle head, a push rod, a spring component and an adapter head, wherein one end of the main body is provided with the nozzle head, the other end of the main body is provided with external threads for installing the adapter head, the main body and the nozzle head are provided with an adapter head channel, a main body channel and a nozzle head channel which are communicated in sequence, a horizontal channel is formed between the front part of the main body channel and the nozzle head channel, the valve needle is arranged in the horizontal channel, the front end of the valve needle is consistent with a feeding hole of the nozzle head, the tail end of the valve needle is arranged in a horizontal through hole of the main body and limited by the side edge of the horizontal through hole, a first radial through channel is arranged in the main body in the vertical direction with the horizontal channel, a second horizontal through hole is also arranged on the main body opposite to the horizontal through hole behind the first radial through channel, the push rod is arranged in the second horizontal through hole, the front end of the push rod props against the tail end of the valve needle, the tail end of the push rod is propped against by the cross rod, the second radial through channel is further arranged behind the first radial through channel, the spring assembly comprises a shell, a spring and an annular piece, the spring is sleeved on the shell of the main body, the front end of the spring is provided with the annular piece and limited by the outer ring of the annular piece, the annular piece is sleeved on the shell of the main body, grooves are symmetrically arranged on the annular piece, the cross rod is arranged in the second radial through channel, the two ends of the cross rod are respectively embedded into the grooves, the shell is wrapped outside the spring, the tail end of the spring is limited by the tail end of the shell or limited by the adapting head, when the nozzle is not used, the spring props against the cross rod, the push rod and the needle valve to close the nozzle, and when the nozzle is used, the needle valve is moved to open the nozzle.

And better, the bushing is arranged between the main body and the valve needle, so that the service life of the sliding pair can be prolonged, and the sliding pair can be conveniently replaced due to abrasion.

And another bushing is arranged between the push rod and the main body, so that the service life of the sliding pair can be prolonged, and the sliding pair can be conveniently replaced due to abrasion.

Preferably, the two bushings are integrated, and a discharge hole is arranged between the tail part of the corresponding needle valve and the push rod.

In order to reduce the probability of foreign matters entering the spring assembly, the diameter of the push rod is smaller than the diameter of the tail part of the needle valve, the push rod is sleeved with an inner bushing, the outer of the inner bushing is sleeved with the same outer bushing of the tail part of the needle valve, and the inner bushing is connected with the outer bushing in a positioning mode through a circlip.

Compared with the prior art, the utility model has the advantages that:

because the outer side of the spring is provided with the shell, the shell and the main body form a closed cavity, and foreign matters such as plastic melt and the like cannot enter the spring, the spring can be well protected, so that faults are reduced, and the service life is prolonged.

And because the push rod is arranged between the first radial through channel and the second radial through channel, the leaked melt is limited and cannot reach the spring, and the spring can be more effectively protected.

The nozzle can be cleaned conveniently through the first radial through passage.

Drawings

Fig. 1 is a schematic view showing a structure of an injection molding machine according to an embodiment of the present utility model in an opened state of a needle valve nozzle.

Fig. 2 is a schematic cross-sectional view showing a flow passage in an opened state of a needle valve nozzle for an injection molding machine according to an embodiment of the present utility model.

Fig. 3 is a schematic cross-sectional view of a push rod setting bush of a needle valve needle of a needle valve nozzle for an injection molding machine according to an embodiment of the present utility model.

Fig. 4 is a perspective view of a needle valve nozzle ring for an injection molding machine according to an embodiment of the present utility model.

Detailed Description

The utility model is further described below with reference to the embodiments of the drawings.

As shown in fig. 1 to 4, the needle valve nozzle for the injection molding machine includes a main body 100, a needle 300, a nozzle head 200, a push rod 500, a spring assembly 600, and an adapter 400.

The main body 100 has an internal thread at one end for installing the nozzle head 200, and an external thread at the other end for installing the adapter 400, and is screwed with one end of the adapter 400.

The adaptor head 400, the main body 100 and the nozzle head 200 are provided with an adaptor head channel 405, a main body channel 105 and a nozzle head channel 205 which are communicated in sequence.

A horizontal channel 102 is formed between the front part of the main body channel 105 and the nozzle head channel 205, the valve needle 300 is arranged in the horizontal channel 102, the front end 301 of the valve needle 300 is consistent with the nozzle head feed inlet 201, and the tail end 302 of the valve needle 300 is arranged in the horizontal through hole 103 of the main body and limited by the side edge of the horizontal through hole 103.

In the main body 100, a first radial through passage 101 is arranged in a direction perpendicular to the horizontal passage 102, so that plastic melt leaking from a gap between the through hole 103 of the main body 100 and the valve needle 300 is discharged, and the first radial through passage 101 is free of a barrier and is easy to clean.

A second horizontal through hole 104 is further provided on the main body opposite to the horizontal through hole 103 behind the radial through channel 101, the push rod 500 is disposed in the second horizontal through hole 104, the front end of the push rod 500 abuts against the tail end of the valve needle 300, and the tail end of the push rod 500 is abutted against the cross rod 604.

The body 100 further provides a second radial through passage 102 behind the radial through passage 101 for mounting the cross bar 604 and limiting the range of movement of the cross bar 604.

The spring assembly 600 includes a housing 601, a spring 602, and a ring 603.

The spring 602 is sleeved on the shell of the main body 100, the front end of the spring 602 is provided with an annular piece 603 and is limited by an outer ring 6032 of the annular piece 603, the annular piece 603 is sleeved on the shell of the main body 100, the annular piece 603 is symmetrically provided with grooves 6031, a cross rod 604 is arranged in the second radial through channel 102, two ends of the cross rod 604 are respectively embedded into the grooves 6031, the outside of the spring 602 is wrapped by a metal shell 601, the tail end of the spring 602 is limited by the tail end of the metal shell 601 or is directly limited by the adapter 400, and the metal shell 601 can prevent foreign matters from falling into the spring 602 to damage the spring 602.

When the nozzle is not in use, the spring 602 pushes the cross bar 604 to drive the push rod 500 and thus the needle valve 300 to close the nozzle.

During injection molding, the plastic melt in the main body pushes the needle valve 300 and the push rod 500 to retreat against the spring force of the spring 602, the front end of the needle valve 300 can leave the nozzle opening, and the nozzle is opened to spray the plastic melt.

During metering and storage, the pressure of the plastic melt in the main body is low enough to overcome the spring force of the spring 602, the front end of the needle valve 300 is propped against the nozzle opening, the nozzle is kept closed, and the plastic melt cannot flow out of the nozzle.

A bushing 400 is further disposed between the main body 100 and the tail end of the needle 300, and another bushing is further disposed between the push rod 500 and the main body 100, so that the service life of the sliding pair can be prolonged, and replacement due to abrasion can be facilitated. In this embodiment, the bushing 400 and the other bushing are integrated, and the bushing 400 is provided with a discharge hole 401 between the corresponding needle valve tail 302 and the push rod 500, so that the plastic little melt leaked is intensively discharged in the first radial through passage 101 without entering the spring.

To reduce the probability of foreign matter entering the spring assembly 600, the diameter of the push rod 500 is smaller than the diameter of the needle valve tail 302, and the same bushing is adopted to increase the processing difficulty because the diameters of the two bushings are different, so that the push rod 500 is nested in the inner bushing 402 by adopting the bushing 400, and the bushing 400 is in positioning connection with the inner bushing 402 by using the circlip 403.

Claims (6)

1. Needle valve type nozzle for injection molding machine, its characterized in that: the needle valve type nozzle for the injection molding machine comprises a main body, a valve needle, a nozzle head, a push rod, a spring component and an adapter head, wherein one end of the main body is provided with the nozzle head, the other end of the main body is provided with external threads for installing the adapter head, the main body and the nozzle head are provided with an adapter head channel, a main body channel and a nozzle head channel which are communicated in sequence, a horizontal channel is formed between the front part of the main body channel and the nozzle head channel, the valve needle is arranged in the horizontal channel, the front end of the valve needle is consistent with a feeding hole of the nozzle head, the tail end of the valve needle is arranged in a horizontal through hole of the main body and limited by the side edge of the horizontal through hole, a first radial through channel is arranged in the main body in the vertical direction with the horizontal channel, a second horizontal through hole is also arranged on the main body opposite to the horizontal through hole behind the first radial through channel, the push rod is arranged in the second horizontal through hole, the front end of the push rod props against the tail end of the valve needle, the tail end of the push rod is propped against by the cross rod, the second radial through channel is further arranged behind the first radial through channel, the spring assembly comprises a shell, a spring and an annular piece, the spring is sleeved on the shell of the main body, the front end of the spring is provided with the annular piece and limited by the outer ring of the annular piece, the annular piece is sleeved on the shell of the main body, grooves are symmetrically arranged on the annular piece, the cross rod is arranged in the second radial through channel, the two ends of the cross rod are respectively embedded into the grooves, the shell is wrapped outside the spring, the tail end of the spring is limited by the tail end of the shell or limited by the adapting head, when the nozzle is not used, the spring props against the cross rod, the push rod and the needle valve to close the nozzle, and when the nozzle is used, the needle valve is moved to open the nozzle.

2. The needle valve nozzle for an injection molding machine according to claim 1, wherein: a bushing is disposed between the body and the valve needle.

3. The needle valve nozzle for an injection molding machine according to claim 1 or 2, characterized in that: another bushing is provided between the push rod and the main body.

4. A needle valve nozzle for an injection molding machine as claimed in claim 3, wherein: the two bushings are integrated, and a discharging hole is arranged between the tail of the corresponding needle valve and the push rod.

5. The needle valve nozzle for an injection molding machine according to claim 1 or 2, characterized in that: the diameter of the push rod is smaller than the diameter of the tail part of the needle valve.

6. The needle valve nozzle for an injection molding machine according to claim 5, wherein: the push rod is sleeved with an inner bushing, the outer of the inner bushing is sleeved with the same outer bushing of the needle valve tail sleeve, and the inner bushing is connected with the outer bushing in a positioning mode through an elastic steel wire check ring.

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