CN112208068A

CN112208068A - Hot runner system and control unit

Info

Publication number: CN112208068A
Application number: CN202011132666.4A
Authority: CN
Inventors: 李象烈
Original assignee: Langli Suzhou Injection Technology Co ltd
Current assignee: Langli Suzhou Injection Technology Co ltd
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2021-01-12

Abstract

The invention discloses a hot runner system and a control unit, the hot runner system comprises a hot nozzle and a valve needle, the valve needle can be driven to slide, the hot runner system also comprises a control unit, the control unit comprises a driving cylinder, a base which is fixed relative to the driving cylinder, and a rotating beam which is rotatably connected with the base through a rotating shaft, the driving cylinder is provided with a cylinder body and a driving rod which can reciprocate along a straight line, the moving direction of the driving rod is parallel to the sliding direction of the valve needle, the driving rod is fixedly connected with a pull rod which is connected with the rotating beam through a connecting shaft, the valve needle is fixedly provided with a valve needle cap, the valve needle cap is connected with the rotating beam through a valve needle shaft, the control unit also comprises a reinforcing component which is connected with the rotating beam, and, when the rotating beam rotates relative to the base, the reinforcing component moves relative to the base. The invention ensures that the heat of the hot nozzle does not influence the driving cylinder, and the whole structure is more stable and reliable.

Description

Hot runner system and control unit

Technical Field

The invention relates to the field of hot runner molds, in particular to a hot runner system and a control unit.

Background

At present, the injection mold generally adopted in the injection molding industry is a hot runner injection mold, and compared with a common mold, the quality of a plastic product injected by a hot runner system is higher, and the hot runner system has the advantages of saving raw materials, improving the production efficiency, improving the automation degree and the like.

The hot runner system generally includes a hot nozzle having a flow passage, a valve needle disposed in the flow passage, the valve needle being driven by a driving cylinder so that the valve needle can slide back and forth to close or open the flow passage, in order to smoothly inject the plastic material into the cavity, the material must be in a liquid state, and the hot nozzle must be maintained at a certain high temperature so as to maintain the material in the liquid state, and the driving cylinder is located above the hot nozzle, and the high temperature of the hot nozzle raises the temperature around the driving cylinder. In order to cool the driving cylinder, a water circulation system is usually arranged around the driving cylinder to achieve the purpose of cooling. However, the arrangement makes the structure of the whole system very complex and the cost is high.

In order to solve the above problems, the skilled person has studied to arrange the driving cylinder offset with respect to the hot nozzle, and to make the driving cylinder offset from the hot nozzle in the longitudinal direction, so that the problem that the heat of the hot nozzle easily affects the driving cylinder is solved, but the structure is not stable and reliable enough.

Disclosure of Invention

The invention aims to provide a hot runner system and a control unit, so that the heat of a hot nozzle does not influence a driving cylinder, and the whole structure is more stable and reliable.

In order to achieve one of the above objects, an embodiment of the present invention provides a hot runner system, which includes a hot nozzle having a flow passage, a valve needle disposed in the flow passage, the valve needle being drivingly slidable to close or open the flow passage, wherein,

the hot runner system further comprises a control unit, the control unit comprises a driving cylinder, a base which is fixed relative to the driving cylinder, and a rotating beam which is rotatably connected to the base through a rotating shaft, the driving cylinder is provided with a cylinder body and a driving rod which can do linear reciprocating motion relative to the cylinder body, the movement direction of the driving rod is parallel to the sliding direction of the valve needle, a pull rod is fixedly connected to the driving rod and connected with the rotating beam through a connecting shaft, a valve needle cap is fixedly arranged on the valve needle and connected with the rotating beam through a valve needle shaft, the control unit further comprises a reinforcing assembly which is connected to the rotating beam and extends through the base, and when the rotating beam rotates relative to the base, the reinforcing assembly moves relative to the base.

As a further improvement of an embodiment of the present invention, the reinforcing members are provided in two, a first reinforcing member is located closer to the valve needle shaft, a second reinforcing member is located closer to the connecting shaft, and the second reinforcing member is located closer to the rotating shaft than the first reinforcing member.

As a further improvement of an embodiment of the present invention, the reinforcing assembly includes a fastening member passing through the rotating beam, and a sleeve fitted around an outer periphery of the fastening member, the base is provided with a through hole larger than an outer diameter of the sleeve, and the sleeve passes through the through hole.

As a further improvement of an embodiment of the present invention, the two turning beams are provided, and the two turning beams are symmetrically arranged on both sides of the base.

As a further improvement of an embodiment of the present invention, a distance is provided between the base and the cylinder in a moving direction of the driving rod.

As a further improvement of an embodiment of the present invention, a plurality of support pads are spaced between the base and the cylinder.

As a further improvement of an embodiment of the invention, the control unit further comprises a blocking member fixedly arranged with respect to the base.

As a further improvement of an embodiment of the present invention, the stopper includes a fixed portion located between the base and the cylinder and a stopper portion extending from the fixed portion toward a part of an outer periphery of the cylinder.

As a further improvement of an embodiment of the present invention, in a moving direction of the driving rod, the fixing portion is closely attached to the base, and the fixing portion is distant from the cylinder.

In order to achieve one of the above objects, an embodiment of the present invention further provides a control unit for a hot runner system, the control unit being configured to control sliding of a valve needle, wherein the control unit includes a driving cylinder, a base fixed with respect to the driving cylinder, and a rotating beam rotatably connected to the base through a rotating shaft, the driving cylinder has a cylinder body and a driving rod reciprocally movable in a straight line with respect to the cylinder body, a moving direction of the driving rod is parallel to a sliding direction of the valve needle, the driving rod is fixedly connected with a pull rod, the pull rod is connected to the rotating beam through a connecting shaft, the valve needle is fixedly provided with a valve needle cap, the valve needle cap is connected to the rotating beam through a valve needle shaft, the control unit further includes a reinforcing assembly connected to the rotating beam, and the reinforcing assembly extends through the base, when the rotating beam rotates relative to the base, the reinforcing component moves relative to the base.

Compared with the prior art, the invention has the beneficial effects that: the driving rod transmits motion to the valve needle cap through the rotating beam to drive the valve needle to slide in a reciprocating mode, so that the driving cylinder deviates from the hot nozzle, and heat of the hot nozzle cannot affect the driving cylinder. In addition, due to the fact that the reinforcing assembly is arranged, when the driving rod drives the rotating beam to rotate, the reinforcing assembly is fixed relative to the rotating beam, and moves relative to the base, and therefore the rotating beam can rotate more stably and reliably.

Drawings

FIG. 1 is a schematic perspective exploded view of a hot runner system according to an embodiment of the present invention;

FIG. 2 is a front view of the hot runner system of FIG. 1;

FIG. 3 is a top view of the hot runner system of FIG. 1;

fig. 4 is a cross-sectional view of the hot runner system of fig. 3.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.

In the various illustrations of the present application, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for ease of illustration and, thus, are provided to illustrate only the basic structure of the subject matter of the present application.

Terms such as "upper," "above," "lower," "below," and the like, used herein to denote relative spatial positions, are used for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. The spatially relative positional terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1 to 4, the embodiment of the present invention provides a hot runner system, which includes a hot nozzle (not shown) having a flow passage, and a valve needle (not shown) disposed in the flow passage, and the valve needle can be driven to slide to close or open the flow passage.

The hot runner system further comprises a control unit, the control unit comprises a driving cylinder 10, a base 12 fixed relative to the driving cylinder 10, and a rotating beam 16 rotatably connected to the base 12 through a rotating shaft 14, the driving cylinder 10 is provided with a cylinder body 18 and a driving rod 20 capable of reciprocating in a straight line relative to the cylinder body 18, the movement direction of the driving rod 20 is parallel to the sliding direction of a valve needle, a pull rod 22 is fixedly connected to the driving rod 20, the pull rod 22 is connected to the rotating beam 16 through a connecting shaft 24, a valve needle cap 26 is fixedly arranged on the valve needle, the valve needle cap 26 is connected to the rotating beam 16 through a valve needle shaft 28, the control unit further comprises a reinforcing component 30 connected to the rotating beam 16, the reinforcing component 30 extends through the base 12, and when the rotating beam 16 rotates relative to the base 12, the reinforcing component.

In the preferred embodiment, the drive rod 20 transfers motion to the needle cap 26 via the rotating beam 16 to drive the needle to slide reciprocally, so that the drive cylinder 10 is offset from the hot nozzle so that heat from the hot nozzle does not affect the drive cylinder 10. In addition, due to the arrangement of the reinforcing component 30, when the driving rod 20 drives the rotating beam 16 to rotate, the reinforcing component 30 is fixed relative to the rotating beam 16, and the reinforcing component 30 moves relative to the base 12, so that the rotating beam 16 can rotate more stably and reliably.

Preferably, the actuating cylinder 10 is a cylinder. Of course, the drive cylinder 10 may also be provided as a pneumatic cylinder.

Further, the reinforcement assembly 30 may be fixedly disposed relative to the pivot beam 16. Additionally, the reinforcement assembly 30 may also be rotatably disposed relative to the pivot beam 16.

Specifically, the reinforcing members 30 are provided in two, the first reinforcing member 30 is located closer to the valve needle shaft 28, the second reinforcing member 30 is located closer to the connecting shaft 24, and the second reinforcing member 30 is located closer to the rotating shaft 14 than the first reinforcing member 30.

The rotary beams 16 are provided in two, and the two rotary beams 16 are symmetrically arranged on both sides of the base 12. The connecting shaft 24 and the valve needle shaft 28 each extend through both turning beams 16. The base 12 is provided with a first long hole 32 and a second long hole 34, the first long hole 32 and the second long hole 34 both extend lengthwise along the moving direction of the driving rod 20, the connecting shaft 24 passes through the first long hole 32, and the valve needle shaft 28 passes through the second long hole 34.

The reinforcing assembly 30 includes a fastening member 36 passing through the rotating beam 16, a sleeve 38 sleeved on the periphery of the fastening member 36, and a locknut 41 in threaded connection with the fastening member 36, wherein a through hole 40 larger than the outer diameter of the sleeve 38 is formed in the base 12, and the sleeve 38 passes through the through hole 40. Taking the installation of one of the reinforcement assemblies 30 as an example, the fastener 36 passes through one of the rotary beams 16 from one side of the rotary beam 16, is sleeved with the sleeve 58, passes through the through hole 40 of the base 12, passes through the other rotary beam 16, and is coupled with the locknut 41, so as to connect the rotary beams 16 on two sides to the base 12.

In addition, the base 12 is spaced from the cylinder block 18 in the direction of movement of the drive rod 20. This prevents heat from the base 12 from being transferred to the cylinder 18, since the base 12 is closer to the hot tip.

A plurality of support pads 42 are spaced between the base 12 and the cylinder 18. Specifically, the number of the support pads 42 is 4, 4 fixing bolts 44 fix the base 12 and the cylinder 18 together, the support pads 42 are hollow, and four fixing bolts 44 penetrate through the 4 support pads 42.

The control unit further comprises a blocking member 46 fixedly arranged with respect to the base 12. The blocking member 46 serves to block heat of the hot nozzle from being transferred to the driving cylinder 10. Specifically, the stopper 46 includes a fixed portion 48 located between the base 12 and the cylinder block 18, and a stopper portion 50 extending from the fixed portion 48 toward a partial outer periphery of the cylinder block 18. The blocking portion 50 protrudes from the lower end of the cylinder block 18 in the moving direction of the driving rod 20, thereby making the heat insulation effect better.

In the direction of movement of the drive rod 20, the fixed portion 48 abuts the base 12 and the fixed portion 48 is spaced away from the cylinder 18. Specifically, a blocking member 46 is mounted between support pad 42 and base 12. Further, the securing portion 48 is located between the support pad 42 and the base 12. The fixing portion 48 is provided with 4 mounting holes 52, and 4 fixing bolts 44 sequentially pass through the cylinder block 18, the supporting pad 42, the mounting holes 52 and the base 12.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. A hot-runner system comprising a hot nozzle having a flow passage, a valve needle disposed within the flow passage, the valve needle being drivingly slidable to close or open the flow passage,

2. The hot-runner system of claim 1, wherein the reinforcement members are arranged in two, a first reinforcement member being closer to the valve pin shaft, a second reinforcement member being closer to the connecting shaft, and the second reinforcement member being closer to the rotating shaft than the first reinforcement member.

3. The hot-runner system of claim 1, wherein the reinforcement assembly comprises a fastener passing through the turning beam, and a sleeve disposed around the fastener, wherein the base has a through hole formed therein that is larger than an outer diameter of the sleeve, and the sleeve passes through the through hole.

4. The hot-runner system of claim 1, wherein the turning beams are provided in two, and the two turning beams are symmetrically arranged on both sides of the base.

5. The hot-runner system of claim 1, wherein the base is spaced from the cylinder in a direction of movement of the drive rod.

6. The hot-runner system of claim 1, wherein a plurality of support pads are spaced between the base and the cylinder.

7. The hot-runner system of claim 1, wherein the control unit further comprises a barrier fixedly disposed relative to the base.

8. The hot-runner system of claim 7, wherein the barrier comprises a stationary portion between the base and the cylinder and a barrier portion extending from the stationary portion toward a portion of an outer periphery of the cylinder.

9. The hot-runner system of claim 8, wherein the stationary portion is proximate the base and the stationary portion is distal from the cylinder in a direction of movement of the drive rod.

10. A control unit for a hot runner system, the control unit being configured to control sliding of a valve needle, the control unit comprising a driving cylinder, a base fixed with respect to the driving cylinder, and a rotating beam rotatably connected to the base via a rotating shaft, the driving cylinder having a cylinder body and a driving rod reciprocally movable in a straight line with respect to the cylinder body, a moving direction of the driving rod being parallel to a sliding direction of the valve needle, the driving rod being fixedly connected with a pull rod, the pull rod being connected to the rotating beam via a connecting shaft, the valve needle being fixedly provided with a valve needle cap, the valve needle cap being connected to the rotating beam via a valve needle shaft, the control unit further comprising a reinforcing member connected to the rotating beam, the reinforcing member extending through the base, when the rotating beam rotates with respect to the base, the reinforcement assembly is movable relative to the base.