Feeding mechanism of injection molding machine

Abstract

The utility model provides a feeding mechanism of an injection molding machine, which comprises a feeding hopper, the upper part of the feeding hopper is communicated with a charging mechanism, the lower end of the feeding hopper is communicated with a downwards arranged material melting pipe, the lower end of the material melting pipe is communicated with a horizontally arranged injection molding pipe, a plurality of first electric heating rings are sleeved outside the material melting pipe, and a plurality of second electric heating rings are sleeved outside the injection molding pipe. A driving motor is mounted at the upper end of the feeding hopper, a power output shaft of the driving motor is downwards connected with a rotating shaft extending into the melting pipe, and a spiral conveying blade is arranged on the outer side of the rotating shaft; a hydraulic telescopic rod is arranged at the end, away from the conical injection molding end, of the injection molding pipe, an injection molding push shaft connected with the hydraulic telescopic rod is slidably connected into the injection molding pipe, a sliding shaft is arranged at the end, away from the hydraulic telescopic rod, of the injection molding push shaft and slidably connected with a piston ring, a plurality of through holes are formed in the piston ring, and a push head is arranged at the end, away from the injection molding push shaft, of the sliding shaft. The whole length of the injection molding machine is effectively shortened, the occupied area is reduced, and the manufacturing cost is further reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to injection molding machine field relates to a kind of injection molding machine feeding mechanism. BACKGROUND

[0002] With the wide application of plastic products in daily life and industrial production, injection molding technology as an important process method for manufacturing plastic products has received more and more attention. As the key equipment for realizing this process, the injection molding machine injects the molten thermoplastic or thermosetting plastic raw material into the mold under certain pressure to form the product of the required shape. Among them, the feeding mechanism of the injection molding machine undertakes the important task of converting from raw materials to melt and subsequent conveying.

[0003] The traditional injection molding machine feeding system mainly includes feeding hopper, screw, heating cylinder and other components. When working, the plastic particles are first sent into the feeding hopper, and then enter the screw area below by gravity. In this process, with the help of heat provided by external heating device, combined with the shear heat generated by screw rotation, the plastic gradually changes from solid to liquid, i.e. the preliminary melting process is completed. Then, the molten material moves forward along the screw advancing direction until it reaches the nozzle, and finally is shot out in the form of high pressure to fill the pre-prepared mold cavity to complete the molding work.

[0004] However, one of the main problems in the existing design is that in order to ensure that the plastic particles can be fully and uniformly melted, a relatively long heating channel is usually needed to provide sufficient residence time and temperature conditions. This results in an increase in the length of the entire feeding mechanism, making the size of the entire injection molding machine become large, occupying a large installation space. In addition, the too long feeding part also increases the requirement for structural stability, and thus more supporting parts have to be used to ensure its normal operation, which undoubtedly increases the manufacturing cost of the equipment. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a kind of injection molding machine feeding mechanism, melt and extrusion of injection molding machine feeding mechanism are divided into two segments of vertical communication, so that the length of feeding mechanism is shorter, effectively shortens the overall length of injection molding machine, reduces floor area, and further reduces manufacturing cost.

[0006] The utility model provides a kind of injection molding machine feed mechanism to solve above-mentioned technical problems, including feed hopper, the upper portion of the feed hopper is connected with feeding mechanism, the lower end of the feed hopper is connected with the downwardly arranged melt pipe, the lower end of the melt pipe is connected with the horizontally arranged injection pipe, one end of the injection pipe is connected with the lower end of the melt pipe, the end of the injection pipe away from the melt pipe is provided with conical injection end, the tip of the conical injection end is provided with injection hole communicated with the injection pipe, the melt pipe is provided with a plurality of first electric heating rings distributed along its height direction, the injection pipe is provided with a plurality of second electric heating rings arranged along its length direction, the upper end of the feed hopper is provided with driving motor, the power output shaft of the driving motor is connected with the shaft that extends into the melt pipe, the shaft is provided with helical conveying blade at the lower part position of the melt pipe and the feed hopper;

[0007] The end of the injection pipe away from the conical injection end is provided with hydraulic telescopic rod mounted on injection molding machine, the end of the injection pipe towards the hydraulic telescopic rod is provided with telescopic hole, the injection push shaft is slidably connected in the injection pipe, the inner diameter of the injection push shaft is less than the inner diameter of the injection pipe, one end of the injection push shaft extends from the telescopic hole and is connected with the telescopic shaft of the hydraulic telescopic rod, the end of the injection push shaft away from the hydraulic telescopic rod is provided with slide shaft, the inner diameter of the slide shaft is less than the inner diameter of the injection push shaft, the slide shaft is slidably connected with piston ring that cannot rotate relative to it, the outer diameter of the piston ring is equal to the inner diameter of the injection pipe, the length of the piston ring is less than the length of the slide shaft, a plurality of through holes are formed along the length direction through the piston ring, the end of the injection push shaft close to the piston ring is provided with a plurality of blocking strips that are one-to-one corresponding to be used for blocking the through holes, the end of the slide shaft away from the injection push shaft is provided with push head, the outer diameter of the push head is less than the inner diameter of the injection pipe, the push head is provided with a plurality of through grooves that are one-to-one corresponding to be communicated with the through holes.

[0008] By adopting the above technical scheme, after the plastic particles are sent into the feeding mechanism by the feeding mechanism, the driving motor drives the shaft to rotate, the plastic particles are slowly brought into the melt pipe and slowly move downward by the helical conveying blade, the air between the particles is gradually heated into molten state by the first electric heating ring during the downward movement, and the air is discharged into the feeding hopper upward by the extrusion of the molten material, then the molten material enters the injection pipe, when the injection pipe is filled with molten material; when injection is needed, the hydraulic telescopic rod is elongated to push the injection push shaft to move forward, due to the resistance of the molten material, the piston ring moves backward and contacts with the blocking strip to block the through hole, at this time, the molten material can be pushed forward by the piston ring and pushed out from the injection hole to the mold; after the injection is completed, the hydraulic telescopic rod is shortened to pull the injection push shaft to move backward, under the push of the molten material, the piston ring slides forward to contact with the push head, so that the plastic molten material can enter the other side of the piston ring through the through hole, and the plastic molten material is continuously transported into the injection pipe during the rotation of the shaft.

[0009] The utility model further sets up, the upper portion of feeding hopper outward is provided with negative pressure cylinder, the dust filter cartridge is provided in negative pressure cylinder, the feeding mechanism includes the negative pressure pump of installing in the negative pressure cylinder outside, the vacuum feeding pipe that is connected with feeding hopper upper portion one side and communicates, the inlet end of negative pressure pump communicates with dust filter cartridge.

[0010] The utility model further sets up, the push head is the taper head that cooperates with the inner wall of taper injection end.

[0011] The utility model further sets up, each plug strip is provided with the plug shaft that cooperates with corresponding through -hole, when the piston ring is contacted with push head, each plug shaft does not plug corresponding through -hole.

[0012] The utility model further sets up, the slide axle is square shaft, and the inner ring of piston ring is the square hole that cooperates with slide axle.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] First, the melting and extrusion of the feeding mechanism of the injection molding machine are divided into two segments of vertical communication, the longer melting segment is vertically arranged, so that the length of the feeding mechanism is shorter, the overall length of the injection molding machine is effectively shortened, the floor area is reduced, while the length of the feeding mechanism is shortened, the use of supporting components is reduced, and the manufacturing cost is further reduced.

[0015] Second, the vertically arranged melting segment enables the air between the particles to be automatically discharged upward into the feeding hopper when the plastic particles are melted, so that the air is not easily discharged due to horizontal arrangement, and the injection molding part has no bubbles, effectively avoiding the generation of bubbles in the injection molding part. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the overall structure schematic view of the utility model;

[0017] Fig. 2 It is the sectional view of the utility model;

[0018] Fig. 3 It is used to show the connection of the piston ring, the injection molding push shaft and the slide shaft.

[0019] Wherein, 1, feed hopper; 2, negative pressure cylinder; 3, dust filter cartridge; 4, negative pressure pump; 5, vacuum feeding pipe; 6, melting pipe; 7, injection pipe; 8, conical injection end; 9, injection hole; 10, first electric heating ring; 11, second electric heating ring; 12, drive motor; 13, rotating shaft; 14, spiral conveying blade; 15, hydraulic telescopic rod; 16, injection push shaft; 17, sliding shaft; 18, piston ring; 19, through hole; 20, plug; 21, push head; 22, through slot; 23, plug shaft. DETAILED DESCRIPTION

[0020] The injection molding machine feeding mechanism according to the present application will be further described below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present application will be more apparent from the following description. It should be noted that the accompanying drawings are all very simplified and use non-precise proportions, only for the purpose of facilitating and clarifying the description of the embodiments of the present application. The same or similar reference signs in the drawings represent the same or similar parts.

[0021] EMBODIMENT, REFERENCE Figs. 1-3 An injection molding machine feeding mechanism, comprising a feed hopper 1, a feeding mechanism is communicated with the upper part of the feed hopper 1, and a negative pressure cylinder 2 is arranged outwardly on the upper part of the feed hopper 1, a dust filter cartridge 3 is arranged in the negative pressure cylinder 2, the feeding mechanism comprises a negative pressure pump 4 installed outside the negative pressure cylinder 2, a vacuum feeding pipe 5 connected with one side of the upper part of the feed hopper 1 and communicated therewith, the inlet end of the negative pressure pump 4 is communicated with the dust filter cartridge 3, and the negative pressure pump 4 can generate negative pressure to suck plastic particles into the feed hopper 1 through the vacuum feeding pipe 5 when working. The lower end of the feed hopper 1 is communicated with a melting pipe 6 arranged downwardly, the lower end of the melting pipe 6 is communicated with an injection pipe 7 arranged horizontally, one end of the injection pipe 7 is connected with the lower end of the melting pipe 6, the end of the injection pipe 7 away from the melting pipe 6 is provided with a conical injection end 8, the conical injection end 8 is connected with a mold part of the injection molding machine, an injection hole 9 communicated with the injection pipe 7 is formed in the tip of the conical injection end 8, the injection hole 9 is also communicated with a feeding channel of the mold, a plurality of first electric heating rings 10 are arranged on the melting pipe 6 in the height direction, a plurality of second electric heating rings 11 are arranged on the injection pipe 7 in the length direction, a drive motor 12 is installed on the upper end of the feed hopper 1, a rotating shaft 13 extending into the melting pipe 6 is connected downwardly with the power output shaft of the drive motor 12, and a spiral conveying blade 14 is arranged on the rotating shaft 13 at the lower part position of the melting pipe 6 and the feed hopper 1.

[0022] The one end of the injection tube 7 away from the tapered injection end 8 is provided with a hydraulic telescopic rod 15 mounted on an injection molding machine, the one end of the injection tube 7 towards the hydraulic telescopic rod 15 is provided with a telescopic hole (not shown), the injection tube 7 is slidably connected with an injection push shaft 16, the inner diameter of the injection push shaft 16 is smaller than the inner diameter of the injection tube 7, the gap between the two is used for entering the plastic melt, the one end of the injection push shaft 16 extends from the telescopic hole and is connected with the telescopic shaft of the hydraulic telescopic rod 15, the one end of the injection push shaft 16 away from the hydraulic telescopic rod 15 is provided with a slide shaft 17, the inner diameter of the slide shaft 17 is smaller than the inner diameter of the injection push shaft 16, the slide shaft 17 is slidably connected with a piston ring 18, the slide shaft 17 is a square shaft, the inner circle of the piston ring 18 is a square hole matched with the slide shaft 17, so that the piston ring 18 cannot rotate relative to the slide shaft 17, the outer diameter of the piston ring 18 is equal to the inner diameter of the injection tube 7, the length of the piston ring 18 is smaller than the length of the slide shaft 17, so that the piston ring 18 can slide relative to the slide shaft 17. Four through holes 19 are provided through the piston ring 18 along the length direction, the plastic melt flows into the one end of the tapered injection end 8 through the through holes 19, the one end of the injection push shaft 16 close to the piston ring 18 is provided with four blocking strips 20 used for blocking the through holes 19 one by one, the one end of the slide shaft 17 away from the injection push shaft 16 is provided with a push head 21, the push head 21 is a tapered head matched with the inner wall of the tapered injection end 8, the outer diameter of the push head 21 is smaller than the inner diameter of the injection tube 7, the push head 21 is provided with four through grooves 22 communicated with the through holes 19 one by one, the one side of each blocking strip 20 towards the slide shaft 17 is provided with a blocking shaft 23 matched with the corresponding through hole 19, the plastic melt is further prevented from flowing reversely through the through holes 19 during injection, when the piston ring 18 contacts with the push head 21, each blocking shaft 23 does not block the corresponding through hole 19.

[0023] Working principle: after the plastic particles are sent into the feeding hopper through the feeding mechanism, the driving motor 12 drives the rotating shaft 13 to rotate, the plastic particles are slowly sent into the melting tube 6 and slowly move downward through the spiral feeding blade 14, the air between the particles is discharged upward into the feeding hopper through the extrusion of the melt during the downward movement, and then the melt enters the injection tube 7, when the injection tube 7 is filled with the melt, the hydraulic telescopic rod 15 is elongated to push the injection push shaft 16 to move forward, due to the resistance of the melt, the piston ring 18 moves backward and contacts with the blocking strip to block the through hole 19, at this time, the melt can be pushed forward through the piston ring 18 and pushed out from the injection hole 9 into the mold; after the injection is completed, the hydraulic telescopic rod 15 is shortened to pull the injection push shaft 16 to move backward, the piston ring 18 slides forward to contact with the push head 21 under the push of the melt, so that the plastic melt can enter the other side of the piston ring 18 through the through hole 19, in the process, the plastic melt is continuously sent into the injection tube 7 through the rotation of the rotating shaft 13.

[0024] It should be noted that the various embodiments described in the specification are progressive, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between embodiments can be mutually referred to.

[0025] The above description is only a description of the preferred embodiments of the utility model, and does not limit the scope of the utility model in any way, and any modification or modification of the above disclosure by a person skilled in the art belongs to the protection scope of the claims.

Claims

1. A feeding mechanism for an injection molding machine comprising a hopper (1), characterized in that, The upper part of the feeding hopper (1) is communicated with a feeding mechanism, the lower end of the feeding hopper (1) is communicated with a downwardly arranged melting pipe (6), the lower end of the melting pipe (6) is communicated with a horizontally arranged injection pipe (7), one end of the injection pipe (7) is connected with the lower end of the melting pipe (6), the end of the injection pipe (7) away from the melting pipe (6) is provided with a tapered injection end (8), the tip of the tapered injection end (8) is provided with an injection hole (9) communicated with the injection pipe (7), the melting pipe (6) is sleeved with a plurality of first electric heating rings (10) distributed along the height direction thereof, the injection pipe (7) is sleeved with a plurality of second electric heating rings (11) arranged along the length direction thereof, the upper end of the feeding hopper (1) is installed with a driving motor (12), the power output shaft of the driving motor (12) is connected downwardly with a rotating shaft (13) extending into the melting pipe (6), the rotating shaft (13) is provided with a spiral conveying blade (14) at the lower part position of the melting pipe (6) and the feeding hopper (1). The end of the injection pipe (7) away from the tapered injection end (8) is provided with a hydraulic telescopic rod (15) mounted on an injection molding machine, the end of the injection pipe (7) towards the hydraulic telescopic rod (15) is provided with a telescopic hole, the injection pipe (7) is slidably connected with an injection pushing shaft (16), the inner diameter of the injection pushing shaft (16) is smaller than the inner diameter of the injection pipe (7), one end of the injection pushing shaft (16) extends out of the telescopic hole and is connected with the telescopic shaft of the hydraulic telescopic rod (15), the end of the injection pushing shaft (16) away from the hydraulic telescopic rod (15) is provided with a sliding shaft (17), the inner diameter of the sliding shaft (17) is smaller than the inner diameter of the injection pushing shaft (16), the sliding shaft (17) is slidably connected with a piston ring (18) which cannot rotate relative to the sliding shaft (17), the outer diameter of the piston ring (18) is equal to the inner diameter of the injection pipe (7), the length of the piston ring (18) is smaller than the length of the sliding shaft (17), a plurality of through holes (19) are formed along the length direction through the piston ring (18), the end of the injection pushing shaft (16) close to the piston ring (18) is provided with a plurality of blocking strips (20) which are one-to-one corresponded with the through holes (19) for blocking the through holes (19), the end of the sliding shaft (17) away from the injection pushing shaft (16) is provided with a pushing head (21), the outer diameter of the pushing head (21) is smaller than the inner diameter of the injection pipe (7), the pushing head (21) is provided with a plurality of through grooves (22) communicated with the through holes (19) one-to-one.

2. An injection molding machine material delivery mechanism as claimed in claim 1 wherein, The upper part of the feeding hopper (1) is provided outwardly with a negative pressure cylinder (2), the negative pressure cylinder (2) is provided with a dust filter cylinder (3) therein, the feeding mechanism comprises a negative pressure pump (4) mounted outside the negative pressure cylinder (2), a vacuum feeding pipe (5) connected with and communicated with one side of the upper part of the feeding hopper (1), the inlet end of the negative pressure pump (4) is communicated with the dust filter cylinder (3).

3. An injection molding machine material delivery mechanism as defined in claim 1, wherein, The pushing head (21) is a tapered head matched with the inner wall of the tapered injection end (8).

4. An injection molding machine material delivery mechanism as described in claim 1 wherein, Each of the plugs (20) is provided with a plug shaft (23) matched with the corresponding through hole (19), and each of the plug shafts (23) does not plug the corresponding through hole (19) when the piston ring (18) is in contact with the push head (21).

5. An injection molding machine material delivery mechanism as described in claim 1 wherein, The slide shaft (17) is a square shaft, and the inner ring of the piston ring (18) is a square hole matched with the slide shaft (17).

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