CN212400210U - Hot runner injection mold - Google Patents

Abstract

The utility model provides a hot runner injection mold, each valve needle (2) is arranged on a valve needle push plate (5), and the valve needle push plate (5) is used for driving all the valve needles (2) to linearly extend and retract along the axis direction of the valve needles (2) in a reciprocating manner; be equipped with axial buffer gear between the top of every needle (2) and needle push pedal (5), this axial buffer gear is used for providing axial position adjustment and axial cushion force when closing the injecting glue hole for the needle, or, every needle (2) are equipped with self-adaptation mechanism, this self-adaptation mechanism realizes the self-adaptation adjustment of axial and two radial directions to needle (2) head when being used for the injecting glue hole of needle closure, the advantage is, reduce the mould cost, do benefit to this technical scheme of realization in the engineering, can have very high precision stability in long-term use, the durability has been promoted simultaneously, reliability, can realize longer life-span.

Description

Hot runner injection mold

Technical Field

The utility model relates to a hot runner forming die technical field specifically says to a hot runner injection mold.

Background

At present, a servo needle valve hot runner system is disclosed on the national intellectual property network, which comprises a servo motor, a needle valve fixing plate and a splitter plate, wherein a plurality of hot nozzles are arranged on the splitter plate, a driving shaft of the servo motor is connected with one end of a coupler, the other end of the coupler is connected with a ball screw, the ball screw is supported and installed on a bearing seat and a ball screw nut, the ball screw nut is installed on a main push plate, the driving shaft of the servo motor, the coupler and the axle center of the ball screw are superposed, a screw hole is arranged on the main push plate, the ball screw is matched with the screw hole on the main push plate, two upper push plates are connected on the main push plate, two lower push plates are installed on the needle valve fixing plate, the lower surfaces of the upper push plates and the upper surfaces of the lower push plates are inclined surfaces of 10-60 degrees, grooves are arranged on the inclined surfaces of the lower, the main push plate drives the lower sliding block to slide on the guide rail under the rotation of the ball screw. The lateral part of the valve needle fixing plate is provided with a plurality of U-shaped grooves, and the side sliding block is fixed on the valve needle fixing plate through the side push plate. The side guide rail which moves relative to the side slide block is arranged on the side supporting plate, and the side supporting plate and the cross beam are kept static when the system operates. The side slide block, the side push plate and the valve needle fixing plate precisely move up and down linearly along the side guide rail under the driving of the upper push plate and the lower push plate. The valve needle fixing plate is fixedly provided with a plurality of valve needles which move in the runner holes of the hot nozzle. The surface hardness of the upper guide rail, the upper sliding block, the lower guide rail and the lower sliding block is higher than that of the upper push plate and the lower push plate, and the surface hardness of the side guide rail and the side sliding block is higher than that of the side supporting plate and the valve needle fixing plate. The invention has the beneficial effects that: the needle valve of the hot runner system of the mold can realize simultaneous accurate opening and closing of a single needle and a plurality of needles, the asynchronous problem of the cylinder oil cylinder is avoided, the position and the speed of opening and closing of the needles can be controlled randomly, the function that the cylinder oil cylinder type needle cannot realize is solved, and therefore more accurate control of the hot runner system is realized.

The servo needle valve hot runner system with the structure has the following defects:

1. because the power driving structure for driving the valve needle driving plate comprises parts such as the servo motor, the ball screw, the coupler, the main push plate, the upper guide rail and the like, the number of parts of the driving structure is large, the structure is complex, and the overall appearance volume is increased.

2. During driving, the pushing of the side surface is converted into the up-and-down movement of the front surface, and although the structure can be realized, the mechanical driving efficiency is low, a servo motor with relatively high torque and power needs to be provided, and the cost of the die is increased.

3. When the die is driven, the upper guide rail, the upper sliding block, the lower guide rail and the lower sliding block need to bear larger pulling force and pressure, and under long-term continuous die opening and closing work, parts deform due to large stress and surface-to-surface friction heating, so that the durability of the whole die is poor.

4. On the basis of integrally pushing the valve needle, how to well ensure that each valve needle well closes each glue injection hole is not provided in the prior art, if the problem is not well solved, the structure of integrally pushing the valve needle is greatly restricted, engineering problems such as control of high part processing precision, assembly precision and movement precision are needed, and even if the problem is solved, how to keep high precision stability in long-term use is not solved, because even if the initial precision is good, the precision stability is poor due to frequent die closing and die assembly along with the lengthening of the service time.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a hot runner injection mold, reduce the mould cost, do benefit to this technical scheme of realization in the engineering, can have very high precision stability in permanent use, promoted durability, reliability simultaneously, can realize longer life-span.

The technical scheme of the utility model is that a hot runner injection mold with the following structure is provided, which comprises a plurality of valve needles, a hot runner plate and a plurality of hot nozzles; the head of each valve needle penetrates through the hot runner plate and extends into a corresponding hot nozzle, the hot runner plate further comprises a valve needle push plate and a linear moving unit, each valve needle is mounted on the valve needle push plate, the linear moving unit is used for driving the valve needle push plate to linearly move in a reciprocating manner along the axis direction of each valve needle, and the valve needle push plate is used for driving all the valve needles to linearly extend in a reciprocating manner along the axis direction of each valve needle; an axial buffer mechanism is arranged between the top of each valve needle and the valve needle push plate and used for adjusting the axial position and axially buffering the valve needle when the valve needle closes the glue injection hole, or each valve needle is provided with a self-adaptive mechanism which is used for realizing self-adaptive adjustment of the head part of the valve needle in the axial direction and the radial direction when the valve needle closes the glue injection hole.

After the structure more than adopting, the utility model has the advantages of it is following:

1. the valve needle push plate is directly pushed and pulled through the linear moving unit, so that the number of parts is small, and the structure is simple; in addition, the added linear moving units can be arranged in the four cross beams of the mould, and when the linear moving units are arranged in the four cross beams of the mould, the height of the cross beams is basically not exceeded, so that the overall appearance volume is hardly increased, and the scheme has the capability of realizing smaller volume.

2. The flexible direction of linear movement unit is linear movement with needle push pedal moving direction, makes the drive more direct effective, and mechanical drive is efficient, compares with servo motor, can adopt more miniature linear movement unit to realize, cost greatly reduced.

3. The linear moving unit is directly fixed and driven with the valve needle push plate, namely only two parts can be realized in the process of mold opening and mold closing without stop, so that the whole mold has higher durability.

4. The axial buffer mechanism is used for providing axial position adjustment and axial buffer force when closing the injection hole for the valve needle, which brings great benefits, and can reduce the manufacturing and assembling precision requirements of the moving structure for driving the valve needle to move and the precision requirements of movement to a great extent, thereby, on one hand, being convenient for engineering implementation of the technical scheme of the utility model, on the other hand, the valve needle can have high precision stability in long-term use, meanwhile, the durability and reliability are improved, and longer service life can be realized, in addition, the movement of the valve needle does not need to consider the control of the force of the valve needle top when the valve needle closes the injection hole, but is handed to the buffer mechanism to adjust the force of the valve needle top, for the existing hot runner mold, when closing the mold at each time, the valve needle has certain impact on the injection hole, and is long-lasting, and the influence on the injection hole is great, lead to unable complete closure, make the product produce defects such as overlap, injecting glue hole deformation, product surface quality variation, the solution commonly used of prior art is that the wearability, the impact resistance of improving injecting glue hole material also take the material that improves the needle head simultaneously, and the utility model provides a as above new technical route solves, has apparent progress.

5. To the condition that is equipped with adaptive mechanism, be favorable to realizing many needles (on the basis that can set up more product die cavities, install needle as many as possible on the push pedal of a needle), the needle is more, it is big more to mean that the degree of difficulty that makes the equal good closure of each needle after the compound die is big, utilize this improvement just can realize many needles comparatively easily, reduce the displacement required precision of each removal structure including the needle simultaneously, make the needle homoenergetic well closed injecting glue hole, the embodiment is in effect, just make and embody very high precision stability in using for a long time. The more valve needles, the more products can be injected (one mold) each time, so that the production efficiency is obviously improved, the production cost is reduced, the competitive advantage is brought, the improvement significance is high, and the improvement is obvious.

As the improvement, still include the fixed plate, the fixed plate is installed more than one linear movement unit, and wherein, linear movement unit's body is fixed in the fixed plate, and linear movement unit's pars contractilis passes the fixed plate and fixes with the needle push pedal, and like this, be convenient for assembly and later maintenance mould, the structure is reliable durable, in addition, can reduce the structure complexity of needle push pedal, is convenient for process, reduce cost, in addition, is convenient for arrange linear movement unit and provides drive power, has reduced the degree of difficulty of arranging.

As the improvement, the linear moving unit comprises a cylinder body and a telescopic part, the valve needle push plate is provided with or processed with the cylinder body, one end of the telescopic part is connected with the cylinder body, and the other end of the telescopic part is fixed, or the valve needle push plate is connected with one end of the telescopic part, and the other end of the telescopic part is provided with the cylinder body, so that an additional fixing plate is not needed, and the structure is more compact.

As the improvement, the telescopic part is simultaneously used as a guide rod, so that the guide rod does not need to be additionally arranged, the structure is further compact, and the cost is also reduced.

As an improvement, for the case where the buffer mechanism is provided: the top of every needle is located the second through-hole of needle push pedal, and the locating part is connected with the second through-hole, and the elastic component is located between locating part and the needle, and this elastic component is used for carrying out axial position adjustment and axial buffering to the needle when needle closure injecting glue hole, and like this, simple structure is compact, and the assembly of being convenient for is convenient for adjust valve needle position simultaneously, does benefit to the field debugging, more is favorable to the guarantee to have very high precision stability in permanent the use.

As the improvement, the elastic part adopts a spring, one end of the spring is abutted to the tail part of the limiting part, and the other end of the spring is sleeved on the top of the valve needle and abutted to the axial limiting end of the valve needle, so that the structure is simple and compact, and the assembly and the adjustment are convenient.

As the improvement, the locating part adopts the bolt, the bolt is screwed on the internal thread at the top of the second through hole, spring one end offsets with the afterbody of bolt, and the other end cover is at the needle top and offset on the spacing end of the axial of needle, and like this, the structure is further simplified, more does benefit to the convenience that promotes assembly, regulation.

As an improvement, for the case where an adaptive mechanism is provided: the self-adaptive mechanism comprises an elastic supporting piece which is arranged on the valve needle push plate and can support axial and radial movement of the valve needle, a space capable of moving radially is arranged between each valve needle and the sliding fit holes matched with the valve needle push plate and the hot runner plate, and the head of the valve needle can be adjusted in an axial and radial self-adaptive mode under the support of the elastic supporting piece.

As the improvement, elastic support piece adopts the spring, and is spacing in the second through-hole of needle push pedal through the locating part, and the top of every needle is located the second through-hole of needle push pedal, spring one end offsets with the afterbody of locating part, and other pot head offsets at the needle top, and the second through-hole is equipped with the space that supplies spring radial motion, and like this, the structure is simple compacter, and the assembly of being convenient for more simultaneously is convenient for adjust the valve needle position more, does benefit to the field debugging, more is favorable to the guarantee to have very high precision stability in permanent the use. The structure enables the spring to move axially and radially in the second through hole, so that the top of the valve needle swings, and meanwhile, because a space capable of moving radially is formed between each valve needle and the sliding matching hole matched with the valve needle push plate and the hot runner plate, the top swing can enable the head of the valve needle to swing, namely the position self-adaption adjustment of the head is realized, and the swinging condition of the head is determined by the condition of the matching hole (namely the glue injection hole) of the hot nozzle and the head of the valve needle.

Drawings

Fig. 1 is a schematic sectional view of the hot runner injection mold of the present invention.

Fig. 2 is a schematic perspective view of the hot runner injection mold of the present invention.

Fig. 3 is an exploded view of a set of valve needles according to the present invention.

Fig. 4 is a schematic cross-sectional view of a set of valve needles according to the present invention.

Fig. 5 is a schematic sectional view of the valve needle push plate of the present invention with a cylinder body.

Shown in the figure: 1. the device comprises a fixing plate, 2, a valve needle, 3, a hot runner plate, 4, a hot nozzle, 5, a valve needle push plate, 6, a linear moving unit, 7, a guide rod, 8, a cross beam, 9, a spring, 10, a bolt, 11, a cylinder body, 12 and a telescopic part.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purposes of limitation.

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1-2, the hot runner injection mold of the present invention comprises a plurality of valve needles 2, a hot runner plate 3 and a plurality of hot nozzles 4; each valve needle 2 passes through hot runner plate 3 and stretches into in a corresponding hot mouth 4, and the valve needle 2 of this embodiment has 16, for two rows distribution, and 8 each row, corresponding hot mouth 4 and valve needle 2 position and quantity one-to-one.

For the case where the fixing plate 1 is provided:

the utility model discloses a hot runner injection mold, still include fixed plate 1, needle push pedal 5 and linear movement unit 6, fixed plate 1 is fixed in to linear movement unit 6's body, linear movement unit 6's pars contractilis and 5 fixed connection of needle push pedal, all needle 2 are installed in needle push pedal 5, linear movement unit 6 is used for driving needle push pedal 5 along the reciprocal linear movement of the axis direction of needle 2, needle push pedal 5 is used for driving all needle 2 and stretches out and draws back along the reciprocal straight line of the axis direction of needle 2 together.

Due to the improvement of the scheme, the linear moving unit 6 can adopt an air cylinder, an oil cylinder or an electric cylinder, but is not limited to a certain type, and the following embodiment is exemplified by the oil cylinder. The height of the oil cylinder is lower than that of a cross beam 8 of the die, a piston rod of the oil cylinder 6 penetrates through the fixing plate 1 to be fixed with the valve needle push plate 5, and the piston rod of the oil cylinder 6 can pull the valve needle push plate 5 to slide up and down when stretching. The four cylinders are symmetrically distributed on the fixing plate 1 along the center, and the force for driving the valve needle push plate is more balanced. Four cylinders are provided at the four vertices of a rectangle in order to equalize the needle push plate 5.

The position that valve needle push pedal 5 is close to four corners is equipped with the guide part with guide bar 7 direction complex, as the direction that valve needle push pedal 5 removed, plays the guide effect, more is favorable to the long-term stable and reliable that uses of mould.

As shown in fig. 3-4, the top of the valve needle 2 of the present invention has two embodiments:

example 1:

a buffer mechanism is arranged between the top of each valve needle 2 and the valve needle push plate 5. Buffer gear includes elastic component and locating part, and the top of every needle 2 is located the second through-hole of needle push pedal 5, the locating part is connected with the second through-hole, the elastic component is located between locating part and the needle 2, and this elastic component is used for providing axial position adjustment and axial cushion power for needle 2, and axial position adjustment can produce axial displacement's adjustment, that is to say needle 2 can be at the epaxial self-adjustment of displacement that carries out. The elastic part adopts a spring 9, the limiting part adopts a bolt 10, the bottom end of the bolt 10 is not in contact with the top of the valve needle 2, and a distance is reserved between the bottom end of the bolt and the top of the valve needle. The bolt 10 is screwed on the internal thread at the top of the second through hole, one end of the spring 9 is propped against the tail part of the bolt 10, and the other end of the spring is sleeved on the top of the valve needle 2 and propped against the boss of the valve needle 2. The axial position of the valve needle 2 can be adjusted in the assembling, debugging or maintenance stage through the inward screwing or outward screwing of the bolt 10, which is very convenient. The inward screwing of the bolt 10 will compress the valve needle 2 more, and the outward screwing of the bolt 10 will release the valve needle 2, so that the axial displacement and the axial buffering performance of the valve needle 2 will be different due to different compression degrees of the spring 9.

Example 2:

each valve needle 2 is provided with a self-adaptive mechanism; the self-adaptive mechanism comprises an elastic supporting piece which is arranged on the valve needle push plate 5 and can support the valve needle 2 to move axially and radially, a space capable of moving radially is formed between the sliding matching holes matched with the valve needle push plate 5 and the hot runner plate 3 of each valve needle 2, and the head of the valve needle 2 can be adjusted in an axially and radially self-adaptive mode under the support of the elastic supporting piece.

Elastic support element adopts spring 9, and is spacing in the second through-hole of needle push pedal 5 through the locating part, and the top of every needle 2 is located the second through-hole of needle push pedal 5, spring 9 one end offsets with the afterbody of bolt 10, and other end cover offsets at needle 2 top, and the second through-hole is equipped with the space that supplies spring radial motion. Advantageously, this construction allows the spring to move axially and radially in the second through hole, thereby achieving a rocking motion of the tip portion of the valve needle 2, while the top rocking motion allows the head portion of the valve needle 2 to rock, i.e., achieving a position adaptive adjustment of the head portion, because each valve needle 2 has a space for radial movement between the slide-fit holes that are fitted to the valve needle push plate 5 and the hot runner plate 3, the rocking motion being determined by the condition of the fitting holes of the hot nozzle and the head portion of the valve needle 2.

To simplify the structure, the following arrangement is also possible:

as shown in fig. 5, the linear moving unit 6 includes a cylinder 11 and an expansion part 12, for example, the linear moving unit 6 is an oil cylinder, and the expansion part 12 is a piston rod. The valve needle push plate 5 is provided with or processed with a cylinder 11, one end of the telescopic part 12 is connected with the cylinder 11, the other end is fixed, as shown in the view angle of fig. 5, the lower end of the telescopic part 12 is fixed. Or, the other way around, namely, the valve needle push plate is connected with one end of the telescopic part 12, and the other end is provided with the cylinder 11.

The telescoping section 12 also acts as a guide bar and at the same time also acts as a guide.

The above description is only for the convenience of understanding the present invention, and the exemplary embodiments are included in the scope of the present invention for the equivalent changes or modifications made by the structure, features and principles described in the claims of the present invention.

Claims (10)

1. A hot runner injection mold comprises a plurality of valve needles (2), a hot runner plate (3) and a plurality of hot nozzles (4); the head of the valve needle (2) passes through the hot runner plate (3) and extends into a corresponding hot nozzle (4), and the hot runner nozzle is characterized in that: the needle pushing mechanism is characterized by further comprising a needle pushing plate (5) and a linear moving unit (6), wherein each needle (2) is installed on the needle pushing plate (5), the linear moving unit (6) is used for driving the needle pushing plate (5) to linearly move in a reciprocating mode along the axis direction of the needle (2), and the needle pushing plate (5) is used for driving all the needles (2) to linearly extend in a reciprocating mode along the axis direction of the needles (2); an axial buffer mechanism is arranged between the top of the valve needle (2) and the valve needle push plate (5), and the axial buffer mechanism is used for adjusting the axial position and axially buffering the valve needle (2) when the valve needle (2) closes the glue injection hole, or the valve needle (2) is provided with an adaptive mechanism which is used for realizing adaptive adjustment of the head of the valve needle (2) in two directions, namely the axial direction and the radial direction when the valve needle (2) closes the glue injection hole.

2. The hot runner injection mold of claim 1, wherein: still include fixed plate (1), more than one linear movement unit (6) are installed in fixed plate (1), and wherein, the body of linear movement unit (6) is fixed in fixed plate (1), and telescopic part (12) of linear movement unit (6) pass fixed plate (1) and are fixed with needle push pedal (5).

3. The hot runner injection mold of claim 1, wherein: the linear moving unit (6) comprises a cylinder body (11) and a telescopic part (12), the cylinder body (11) is arranged or processed on the valve needle push plate, one end of the telescopic part (12) is connected with the cylinder body (11), and the other end of the telescopic part is fixed, or the valve needle push plate is connected with one end of the telescopic part (12), and the cylinder body (11) is arranged at the other end of the telescopic part.

4. A hot runner injection mold as claimed in claim 3 wherein: the telescopic part (12) also serves as a guide rod.

5. The hot runner injection mold of claim 1, wherein: for the case where the buffer mechanism is provided: the top of every needle (2) is located the second through-hole of needle push pedal (5), and the locating part is connected with the second through-hole, and the elastic component is located between locating part and needle (2), and this elastic component is used for carrying out axial position adjustment and axial buffering to needle (2) when needle (2) closed the injection hole.

6. The hot runner injection mold of claim 5, wherein: the elastic component adopts spring (9), spring (9) one end offsets with the afterbody of locating part, and the other end cover is at the axial spacing end of needle (2) top and offset at needle (2).

7. The hot runner injection mold of claim 6, wherein: the limiting part adopts a bolt (10), the bolt (10) is screwed on the internal thread at the top of the second through hole, and one end of the spring (9) is propped against the tail part of the bolt (10).

8. The hot runner injection mold of claim 1, wherein: for the case where an adaptive mechanism is provided: the self-adaptive mechanism comprises an elastic supporting piece which is arranged on a valve needle push plate (5) and can support the valve needle (2) to move axially and radially, a space capable of moving radially is arranged between each valve needle (2) and the sliding fit hole matched with the valve needle push plate (5) and the hot runner plate (3), and the head of the valve needle (2) can be adjusted in an axial and radial self-adaptive mode under the support of the elastic supporting piece.

9. The hot runner injection mold of claim 8, wherein: elastic support element adopts spring (9), and is spacing in the second through-hole of needle push pedal (5) through the locating part, and the top of every needle (2) is located the second through-hole of needle push pedal (5), spring (9) one end offsets with the afterbody of locating part, and other pot head offsets at needle (2) top, and the second through-hole is equipped with the space that supplies spring radial motion.

10. The hot runner injection mold of claim 1, wherein: the linear moving unit (6) adopts an air cylinder or an oil cylinder or an electric cylinder.

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