CN109318452B

CN109318452B - In-mold automatic shearing sprue mold structure of plastic pipe fitting

Info

Publication number: CN109318452B
Application number: CN201811385397.5A
Authority: CN
Inventors: 马胜; 孙宽; 褚红波
Original assignee: Linhai Weixing New Building Materials Co Ltd
Current assignee: Linhai Weixing New Building Materials Co Ltd
Priority date: 2018-11-20
Filing date: 2018-11-20
Publication date: 2020-09-11
Anticipated expiration: 2038-11-20
Also published as: CN109318452A

Abstract

The invention relates to the technical field of injection molds, in particular to an in-mold automatic shearing sprue mold structure of a plastic pipe fitting. The in-mold automatic gate shearing mold structure for the plastic pipe fitting comprises a movable mold, a fixed mold, a core pulling A and a core pulling B, wherein the core pulling A and the core pulling B are connected with the movable mold in a sliding manner; and the core pulling B drives the plastic pipe fitting to move towards the blade after the core pulling A and the movable die are separated from the plastic pipe fitting, so that the blade cuts off a sprue connected with the plastic pipe fitting. According to the invention, the in-mold automatic shearing gate mold structure of the plastic pipe fitting is provided with the scraper plate, the scraper plate is used for fixing the blade, the plastic pipe fitting moves to the position of the blade along the core demolding direction under the holding force of the core to cut off the gate, the plastic pipe fitting cannot incline and the like, and the cutting off position is stable and accurate.

Description

In-mold automatic shearing sprue mold structure of plastic pipe fitting

Technical Field

The invention relates to the technical field of injection molds, in particular to an in-mold automatic shearing sprue mold structure of a plastic pipe fitting.

Background

In short, the mold is a tool for manufacturing molded articles, the tool is composed of various parts, different molds are composed of different parts, in the plastic mold manufacturing industry, appearance plastic products are more and more, the requirement of the appearance plastic products is very strict, and the phenomena of joint lines, flow marks, gates and the like can not appear on the surfaces of the products, so that higher requirements are provided for the manufacturing of the plastic mold.

After the product injection moulding in production, still leave the runner on the product, like overlap joint formula runner or side runner, the outside plastic of runner links together with the product, needs to cut the plastic to guarantee the pleasing to the eye of product, and current runner is cuted generally to be the manual shearing, and this kind of mode of shearing manual labor is big, and shearing speed is slow, and the shearing department is not pleasing to the eye enough, influences the quality of product, and work efficiency is low.

Please refer to fig. 1, chinese utility model patent with publication number CN204936092U discloses an automatic shearing side gate mechanism in pipe fitting injection mold mould, is applied to injection mold, and the mould includes mould, lower mould and base, and automatic shearing side gate mechanism includes: cutter, hydro-cylinder link plate and picture peg, the hydro-cylinder link plate sets up the lower mould with the arbitrary one side of base, hydro-cylinder and hydro-cylinder link plate are connected, and the bottom mounting of hydro-cylinder link plate is on the picture peg, picture peg and base sliding connection, and the base top is equipped with faller and lower faller, and lower faller is located the top of picture peg. According to the in-mold automatic shearing side gate mechanism of the pipe fitting injection mold, when the lower needle plate slides leftwards and rightwards on the base through the inserting plate to form an up-and-down motion to eject a product, the cutter bar performs automatic shearing on the gate quickly through the cutter, so that the injection product utilizes mechanical automatic shearing to replace manual shearing, a large amount of manpower and labor intensity of worker production can be saved, and the labor cost of the product is reduced.

This automatic cutout side runner mechanism in pipe fitting injection mold mould needs the thimble to carry out the shearing through cylinder drive cutter with the shaping pipe fitting ejecting back earlier, shears the shaping face that does not target in place and fish tail pipe fitting easily with the intention under the condition that the pipe fitting took place to incline when ejecting, and the position of cylinder still need be installed to the mould, has increased the mould external dimension, needs to select great injection molding machine, has increased the cost.

Disclosure of Invention

The invention aims to provide an in-mold automatic shearing sprue mold structure of a plastic pipe fitting, which has the advantages of stable shearing and difficulty in scratching the molding surface of the pipe fitting.

In order to achieve the advantages, the in-mold automatic shearing sprue mold structure for the plastic pipe fitting comprises a movable mold, a fixed mold, a core pulling A and a core pulling B, wherein the core pulling A and the core pulling B are connected with the movable mold in a sliding mode;

the movable die is fixedly connected with a blade which corresponds to the sprue and is used for cutting the sprue;

and the core pulling B drives the plastic pipe fitting to move towards the blade after the core pulling A and the movable die are separated from the plastic pipe fitting, so that the blade cuts off a sprue connected with the plastic pipe fitting.

In an embodiment of the in-mold automatic gate shearing mold structure of the present invention, the movable mold includes a movable mold core, a first mold plate, and a second mold plate, the movable mold core penetrates through the first mold plate and is fixedly connected to the second mold plate, the first mold plate is slidably connected to the movable mold core, the first mold plate is fixedly connected to a scraper for fixing the movable mold core, and the scraper is further configured to separate the core pulling B from the plastic pipe.

In an embodiment of the in-mold automatic gate shearing mold structure, the in-mold automatic gate shearing mold structure further includes an upper doubling plate, a mold leg, a lower doubling plate and a draw hook, the upper doubling plate is fixedly connected with the fixed mold, the movable mold is fixedly connected with the lower doubling plate through the mold leg, and the draw hook is used for separating the first mold plate from the second mold plate.

In an embodiment of the in-mold automatic shearing gate mold structure of the present invention, the fixed mold is fixed with a first bending pin and a second bending pin for driving the core pulling a and the core pulling B to move between the mold locking position and the mold releasing position respectively.

In an embodiment of the in-mold automatic gate shearing mold structure of the present invention, the core B is provided with a straight surface through groove for matching with the second bent pin, and the straight surface through groove is used for keeping the core B stationary when the core a and the movable mold are separated from the plastic pipe.

In an embodiment of the in-mold automatic gate shearing mold structure, the first template is provided with a limiting elastic block matched with the draw hook, the limiting elastic block is connected with the draw hook in a sliding manner, and the upper surface of the limiting elastic block is provided with an inclined surface;

the draw hook comprises an upper draw hook body and a lower draw hook body, the upper draw hook body is fixedly connected with the fixed die, the lower draw hook body is fixedly connected with the second template, the upper draw hook body and the lower draw hook body are respectively provided with a first matching bulge and a second matching bulge, and the first matching bulge and the second matching bulge are respectively provided with a limiting surface Z1 and a limiting surface Z2, an oblique guide surface X1 and an oblique guide surface X2;

the limiting surface Z1 is used for limiting the limiting elastic block in a matched mode, the first template is separated from the fixed die in a separated mode, the limiting surface Z2 is used for limiting the limiting elastic block in a matched mode, the separated distance between the first template and the second template is separated from the fixed die in a matched mode, the inclined guide surface X1 is used for extruding the inclined surface to enable the limiting elastic block to be removed from being matched with the limiting surface Z2, and the inclined guide surface X2 is used for extruding the inclined surface to enable the limiting elastic block to be removed from being matched with the limiting surface Z1.

In one embodiment of the in-mold automatic shear gate mold structure of the present invention, an elastic element is provided between the retainer spring block and the first mold plate.

In one embodiment of the in-mold auto-shear gating mold structure of the present invention, the resilient member is a spring.

In one embodiment of the in-mold auto-shear runner mold structure of the present invention, the first mold plate is provided with a distance limiting mechanism for limiting a separation distance of the first mold plate and the second mold plate.

In one embodiment of the in-mold auto-shear gating mold structure of the present invention, the distance limiting mechanism is a bolt.

According to the invention, the in-mold automatic shearing gate mold structure of the plastic pipe fitting is provided with the scraper plate, the scraper plate is used for fixing the blade, the plastic pipe fitting moves to the position of the blade along the core demolding direction under the holding force of the core to cut off the gate, the plastic pipe fitting cannot incline and the like, and the cutting off position is stable and accurate.

In the invention, the scraper plate is provided with the through hole allowing the loose core B to pass through, the radial size of the through hole is smaller than the outer diameter of the plastic pipe fitting, the ejection of a thimble is not needed, and the surface of the molded plastic pipe fitting has no thimble mark.

According to the in-mold automatic shearing sprue die structure of the plastic pipe fitting, a cylinder is not required to be arranged to drive a cutter to shear the sprue, the outer dimension of the die is smaller than that of an in-mold automatic shearing side sprue mechanism of an injection die of the pipe fitting in the prior art, the assembly is more labor-saving, and the cost is saved.

Drawings

Fig. 1 is a schematic structural diagram of a conventional in-mold automatic shearing side gate mechanism of a pipe injection mold.

Fig. 2 is a schematic structural diagram of an in-mold automatic shear gating mold structure for a plastic pipe fitting according to a first embodiment of the present invention.

Fig. 3 is a schematic plan view of the in-mold auto-shear gating mold structure of the plastic pipe of fig. 2.

Fig. 4 is a cross-sectional view of the in-mold auto-shear runner mold structure of the plastic pipe of fig. 2.

Figure 5 is a cross-sectional view of the other side of the in-mold auto-shear gate mold structure of the plastic pipe of figure 2.

Fig. 6 is an exploded view of the in-mold auto-shear gating mold structure of the plastic pipe of fig. 2.

Fig. 7 is a schematic top view of a movable mold of the in-mold automatic shear gating mold structure of the plastic pipe fitting of fig. 6.

Fig. 8 is a partial enlarged view of fig. 7 at H.

Fig. 9 is a schematic diagram of a bending pin of the in-mold auto-shear runner mold structure of the plastic pipe of fig. 6.

Fig. 10 is a schematic structural view of a core back a of the in-mold automatic shear gate mold structure of the plastic pipe fitting of fig. 6.

Fig. 11 is a schematic structural view of a core back B of the in-mold automatic shear gate mold structure of the plastic pipe fitting of fig. 6.

Fig. 12 is a schematic view of a wiper plate of the in-mold auto-shear runner mold structure for the plastic pipe of fig. 6.

Fig. 13 is a schematic structural view of a position limiting spring block of the in-mold automatic shear gate mold structure of the plastic pipe fitting of fig. 6.

Fig. 14 is a schematic diagram of a draw hook of the in-mold auto-shearing gating mold structure of the plastic pipe fitting of fig. 6.

Detailed Description

To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be provided with reference to the accompanying drawings and preferred embodiments for describing specific embodiments, structures, features and effects thereof.

Referring to fig. 2 to 6, the in-mold automatic shearing gate mold structure for plastic pipe fittings according to the first embodiment of the present invention includes: the device comprises an upper compound plate 1, a fixed die 2, a movable die 3, a loose core A and a loose core B which are connected with the movable die 3 in a sliding manner, a draw hook 4, a die leg 5 and a lower compound plate 6.

The upper compound plate 1 is fixedly connected with the fixed die 2. The movable mould 3 is connected and fixed with the lower compound plate 6 through a mould foot 5. The fixed die 2 is fixed with a first bent pin 2A and a second bent pin 2B which are respectively used for driving the core pulling A and the core pulling B to move between a die locking position and a die stripping position.

Referring to fig. 9, specifically, the fixed mold 2 includes a fixed mold plate 21 and a fixed mold core 22, and the fixed mold plate 21 is fixedly connected to the fixed mold core 22. The first bending pin 2A and the second bending pin 2B are respectively connected and fixed with the fixed template 21, the first bending pin 2A and the second bending pin 2B are respectively provided with a straight rod C and an inclined rod D, and the inclined rod D extends towards the direction departing from the center of the mold to form an angle beta with the straight rod C. Preferably, the angle β between the straight rod C and the diagonal rod D is 155 °.

A blade 7 for cutting off the gate corresponding to the gate is connected and fixed to the movable mold 3. Further, the movable mold 3 includes a movable mold core 31, a first mold plate 32, and a second mold plate 33. The movable mold core 31 passes through the first mold plate 32 and is connected and fixed with the second mold plate 33. The first mold plate 32 is slidably connected with the movable mold core 31, and the core pulling A and the core pulling B are slidably connected with the first mold plate 32.

The cavity block 22 and the cavity block 31 form a flow passage E and a cavity corresponding to the plastic pipe 100. The core A and the core B are moved from the mold clamping position to the mold releasing position while the movable mold 3 is moved from the mold clamping position to the mold releasing position.

Referring to fig. 10, the core pulling a includes a core a1, a slider a2, and a core fixing plate A3, the core a1 is fixedly connected to the slider a2 through the core fixing plate A3, the slider a2 is slidably connected to the first mold plate 32, and the slider a2 is provided with a guide groove a4 engaged with the inclined rod D of the first bending pin 2A.

Referring to fig. 11, the core B is used to drive the plastic pipe 100 to move towards the blade 7 after the core a and the movable mold 3 are separated from the plastic pipe 100, so that the blade 7 cuts off the gate connected to the plastic pipe 100. The loose core B comprises a core B1, a slide block B2 and a core fixing plate B3, wherein the core B1 is fixedly connected with a slide block B2 through a core fixing plate B3, a slide block B2 is in sliding connection with the first template 32, and the slide block B2 is provided with a straight surface through groove B4 matched with a straight rod C of the second bent pin 2B and a guide groove B5 matched with an inclined rod D of the second bent pin 2B. The straight surface penetrating groove B4 is used for being matched with a straight rod of the core pulling B to keep the core pulling B in a non-core-pulling state before the core pulling A and the movable die 3 are separated from the plastic pipe fitting 100.

Referring to fig. 12, the first template 32 is fixedly connected with a wiper plate 321 for fixing the blade 7. The scraper 321 also serves to detach the core B from the plastic tube 100. The wiper 321 defines a through hole 321a for the core B1 to pass through, and the radial dimension of the through hole 321a is smaller than the outer diameter of the plastic pipe 100.

Referring to fig. 13-14, the draw hook 4 is used to separate the first template 32 from the second template 33. The draw hook 4 comprises an upper draw hook body 41 and a lower draw hook body 42, the upper draw hook body 41 is fixedly connected with the second template 33, and the lower draw hook body 42 is fixedly connected with the fixed die 2. The first template 32 is provided with a limit elastic block 322 matched with the draw hook 4, and an elastic element t is arranged between the limit elastic block 322 and the first template 32. The first die plate 32 is provided with a distance limiting mechanism for limiting the separation distance of the first die plate 32 and the second die plate 33. Preferably, the elastic element t is a spring. The distance limiting mechanism is a bolt.

Specifically, the upper hook body 41 and the lower hook body 42 are respectively provided with a first engaging protrusion 411 and a second engaging protrusion 421, and the first engaging protrusion 411 and the second engaging protrusion 421 are respectively provided with a limiting surface Z1, a limiting surface Z2, an oblique guide surface X1 and an oblique guide surface X2.

The limiting surface Z1 is used for limiting the separation distance between the first template 32 and the fixed mold 2 by matching with the lower surface of the limiting elastic block 322, the limiting surface Z2 is used for limiting the separation distance between the first template 32 and the second template 33 by matching with the lower surface of the limiting elastic block 322, the inclined guide surface X1 is used for releasing the limitation of the limiting surface Z2 on the separation distance between the first template 32 and the second template 33, and the inclined guide surface X2 is used for releasing the limitation of the limiting surface Z1 on the separation distance between the first template 32 and the fixed mold 2.

Further, the position limiting elastic block 322 has a slope 322A matching with the slope guide surfaces X1 and X2. The inclined guide surface X1 presses the inclined surface X1 to release the engagement of the stopper spring 322 with the restricting surface Z2 to release the restriction of the separation distance between the first die plate 32 and the second die plate 33 by the restricting surface Z2, and the inclined guide surface X2 presses the inclined surface 322A to release the engagement of the stopper spring 322 with the restricting surface Z1 to release the restriction of the separation distance between the first die plate 32 and the fixed die plate 21 by the restricting surface Z1.

The lower end part of the upper hook body 41 and the upper end part of the lower hook body 42 are respectively provided with inclined guide surfaces X1 and X2 for pressing the limiting elastic block 322 to make the limiting elastic block 322 move towards the center of the first template 32,

the working principle of the in-mold automatic shearing gate mold structure of the plastic pipe fitting 100 is as follows:

after the injection of the mold is finished, the injection molding machine drives the movable mold 3 to move from the mold closing position to the mold opening position, and in the moving process, the first bent pin 2A drives the core pulling A to move from the mold locking position to the mold releasing position; until the core A1 is demoulded, the limiting surface Z1 of the upper drag hook body 41 is matched with the lower surface of the limiting elastic block 322 to limit the first template 32 to move towards the mould opening direction, and the second template 33 drives the movable mould core 31 to continue to move towards the mould opening direction; when the core pulling B is not released, the second mold plate 33 drives the movable mold core 31 to move continuously toward the mold opening direction, so that the movable mold core 31 is separated from the plastic pipe 100; when the movable die core 31 is separated from the plastic pipe 100, the inclined guide surface X2 of the lower pull hook body 42 is in contact with the inclined surface 322A of the limiting elastic block 322, then the inclined surface 322A is extruded under the driving of the second die plate 33 continuing to move towards the die opening direction, so that the limiting elastic block 322 is compressed towards the interior of the die to remove the matching with the limiting surface Z1, then the second die plate 33 drives the first die plate 32 to move towards the die opening direction under the action of the distance limiting mechanism, and in the moving process, the second bent pin 2B drives the core pulling B to move from the die locking position to the die releasing position; under the holding force of the core B1, the plastic pipe 100 and the sprue connected with the plastic pipe move towards the blade 7 along with the core pulling B, so that the blade 7 cuts the sprue connected with the plastic pipe 100; finally, the plastic pipe 100 abuts against the scraper 321, and the core B1 is demolded under the block of the scraper 321, so that the demolding of the mold is completed.

During mold closing, the injection molding machine drives the movable mold 3 to move from the mold opening position to the mold closing position, and in the moving process, the limiting surface Z2 of the pull-down hook body 42 abuts against the lower surface of the limiting elastic block 322 to enable the second bent pin 2B to drive the core pulling B to complete resetting firstly; then, the inclined guide surface X1 of the upper drag hook body 41 contacts the inclined surface 322A of the limit elastic block 322, and then the inclined surface 322A is extruded to compress the limit elastic block 322 towards the interior of the mold, so that the limit surface Z2 is released to abut against the lower surface of the limit elastic block 322, and the movable mold core 31 is reset; when the movable mould core resets, the first bent pin 2A can drive the core-pulling A to move from the demoulding position to the mould locking position until the core-pulling A resets, and mould closing of the mould is completed.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides an automatic cutout runner mould structure in mould of plastics pipe fitting, include movable mould, cover half, with movable mould sliding connection's the A of loosing core and the B of loosing core, loose core A with the B of loosing core removes the drawing of patterns position from the mode locking position when the movable mould removes the die sinking position from the compound die position, its characterized in that:

the core pulling B drives the plastic pipe fitting to move towards the blade after the core pulling A and the movable die are separated from the plastic pipe fitting, so that the blade cuts off a sprue connected with the plastic pipe fitting; the movable mould comprises a movable mould core, a first mould plate and a second mould plate, the movable mould core penetrates through the first mould plate and is fixedly connected with the second mould plate, the first mould plate is in sliding connection with the movable mould core, the first mould plate is fixedly connected with a scraper for fixing a blade, and the scraper is also used for separating the core pulling B from the plastic pipe fitting; the in-mold automatic gate shearing mold structure further comprises an upper compound plate, mold feet, a lower compound plate and a draw hook, wherein the upper compound plate is fixedly connected with the fixed mold, the movable mold is fixedly connected with the lower compound plate through the mold feet, and the draw hook is used for separating the first template from the second template; the first template is provided with a limiting elastic block matched with the draw hook, the limiting elastic block is connected with the draw hook in a sliding manner, and the upper surface of the limiting elastic block is provided with an inclined plane;

2. The in-mold automatic gate shearing mold structure for the plastic pipe fitting as claimed in claim 1, wherein the fixed mold is fixed with a first bending pin and a second bending pin for driving the core pulling a and the core pulling B to move between the mold locking position and the mold releasing position respectively.

3. The in-mold automatic gate shearing mold structure for the plastic pipe fitting as claimed in claim 2, wherein the core B is provided with a straight through groove for matching with the second bent pin, and the straight through groove is used for keeping the core B still when the core A and the movable mold are separated from the plastic pipe fitting.

4. The in-mold automatic shear gating mold structure of a plastic pipe fitting of claim 3, wherein an elastic element is arranged between the limiting elastic block and the first mold plate.

5. The in-mold auto-shear gating mold structure of a plastic pipe as claimed in claim 4, wherein the resilient member is a spring.

6. An in-mold auto-shear gating mold structure for plastic tubing as claimed in claim 5, wherein the first mold plate is provided with a distance limiting mechanism for limiting a separation distance of the first mold plate and the second mold plate.

7. The in-mold auto-shear gating mold structure of a plastic pipe as claimed in claim 6, wherein the distance limiting mechanism is a bolt.