1. The utility model provides an automatic cutout side runner mechanism in mould that is suitable for injection mold, includes mould and lower mould, the inside of going up the mould is equipped with the die cavity, the inside of lower mould is equipped with down die cavity and takes the shaping lug of cooling water course, its characterized in that: the inside of going up the mould is equipped with the sprue way, the top of sprue way is equipped with the runner piece, be connected with two at least side sprue ways between the bottom of sprue way and the last die cavity, the top of every side sprue way has driven hydraulic chamber through the cut-off groove intercommunication, the inside of going up the mould is equipped with initiative hydraulic chamber, every driven hydraulic chamber communicates with the initiative hydraulic chamber through an oil circuit, be equipped with gliding slave piston in the slave hydraulic chamber, slave piston's bottom mounting has the cutter arbor of slip restriction in the cut-off groove, be equipped with initiative push rod and gliding initiative piston in the initiative hydraulic chamber, the expansion end fixed connection of initiative piston and initiative push rod.

2. The in-mold automatic cutout side gate mechanism for an injection mold according to claim 1, wherein: the upper die cavity and the lower die cavity jointly form a die cavity, and the ratio of the length value to the width value of the die cavity is 3-8.

3. The in-mold automatic cutout side gate mechanism for an injection mold according to claim 1, wherein: the channel of the side sprue channel close to the upper cavity is a horizontal channel with a rectangular cross section, the cutting groove is communicated with the upper side of the horizontal channel, and the width value of the cutting groove is equal to that of the horizontal channel.

4. The in-mold automatic cutout side gate mechanism for an injection mold according to claim 1, wherein: the included angle between the cutting groove and the vertical surface is 0-60 degrees.

5. The in-mold automatic cutout side gate mechanism for an injection mold according to claim 1, wherein: grooves are formed in the circumferential directions of the driven piston and the driving piston, sealing rings are arranged in the grooves, and the sealing rings are extruded and deformed by the matching of the inner side wall of the hydraulic chamber and the piston, so that the sealing rings are tightly attached to the driven piston and the driving piston respectively.

6. The in-mold automatic cutout side gate mechanism for an injection mold according to claim 1, wherein: a compression spring is sleeved on the outer side of the rod body of the cutter rod positioned in the driven hydraulic chamber; the front end of the cutter bar is provided with a cutting edge, and the matching relationship between the rod body of the cutter bar and the cutting groove is transition matching.

7. The in-mold automatic cutout side gate mechanism for an injection mold according to claim 1, wherein: the upper die is located on the molded surface and inwards provided with a plurality of positioning grooves, the lower die is located on the molded surface and provided with a plurality of positioning protrusions protruding outwards, and the positioning grooves correspond to the positioning protrusions in position and shape one to one.

8. An in-mold automatic shut-off side-gating mechanism for an injection mold according to any one of claims 1 to 7, wherein: the cross section areas of the driven hydraulic chambers are equal, the cross section area of the driving hydraulic chamber is N times of the cross section area of the driven hydraulic chamber, and N is the quantity value of the driven hydraulic chamber.

9. An in-mold automatic shut-off side-gating mechanism for an injection mold according to any one of claims 1 to 7, wherein: the cross section areas of the driven hydraulic chambers are different, and the cross section area of the driving hydraulic chamber is the sum of the cross section areas of all the driven hydraulic chambers.

Background

An injection mold is a tool for producing plastic products; the sprue is a section of channel from the runner to a mold cavity in the injection mold, and common sprue comprises a direct sprue, a side sprue and a spot sprue; the existing injection mold cannot well cut off the side gate, so that scars can be left on the injection product, the chamfering structure of the injection product is damaged, the attractiveness and the qualification rate of the injection product are affected, and the use requirements of people cannot be better met. How to cut off a side gate of an injection mold well is a technical problem which needs to be solved urgently at present.

For this reason, disclose an injection mold side runner shutdown mechanism in the patent specification of publication No. CN210733156U, including cover half and movable mould, and the cover half is located the top of movable mould, the shaping groove has been seted up between cover half and the movable mould, the feed inlet has been seted up at the top of cover half, the bottom of feed inlet extends to the inside of cover half, the side runner has been seted up to the bottom of feed inlet and the inside that is located the cover half, and the one end that the feed inlet was kept away from to the side runner extends to a side top of shaping groove and with shaping groove UNICOM, the side runner is kept away from the top of feed inlet one end and is located the inside of cover half and has seted up the cutting groove, the mounting groove has been seted up at the top of cutting groove, and the top of mounting groove extends to the top of cover half, the internally mounted of mounting groove has the movable rod, the connecting axle is installed to the bottom of movable rod. The side gate can be cut by the interaction of the movable rod and the cutting piece and the interaction of the tooth groove and the toothed ring.

However, the injection mold side gate cutting mechanism has the disadvantages that firstly, the in-mold cutting cannot be realized, and the cutting operation is complex; secondly, the injection mold is only suitable for the condition of a single-side sprue, the required cavity volume is large for large-size injection molding parts with large length-width ratios, a plurality of side sprues are required to be arranged for filling in due time, and the existing injection mold side sprue cutting mechanism cannot simultaneously cut off a multi-side sprue runner.

Disclosure of Invention

The present invention has been made to overcome the above problems occurring in the prior art, and an object of the present invention is to provide an in-mold automatic cutting side gate mechanism suitable for an injection mold.

In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:

an in-mold automatic cutting side gate mechanism suitable for an injection mold comprises an upper mold and a lower mold, wherein an upper cavity is arranged inside the upper mold, a lower cavity and a forming lug with a cooling water channel are arranged in the lower die, a direct sprue channel is arranged in the upper die, the top end of the straight sprue channel is provided with a sprue block, at least two side sprue channels are connected between the bottom end of the straight sprue channel and the upper cavity, the upper part of each side sprue channel is communicated with a driven hydraulic chamber through a cutting groove, the interior of the upper die is provided with a driving hydraulic chamber, each driven hydraulic chamber is communicated with the driving hydraulic chamber through an oil way, a sliding driven piston is arranged in the driven hydraulic chamber, a cutter bar which is limited in the cutting groove in a sliding manner is fixed at the bottom end of the driven piston, the driving hydraulic chamber is internally provided with a driving push rod and a driving piston capable of sliding, and the driving piston is fixedly connected with the movable end of the driving push rod.

Further, in the in-mold automatic cutting side gate mechanism suitable for the injection mold, the upper mold cavity and the lower mold cavity jointly form a mold cavity, and the ratio of the length value to the width value of the mold cavity is 3-8.

Further, in the in-mold automatic cutting side gate mechanism suitable for the injection mold, a channel of the side gate close to the upper cavity is a horizontal channel with a rectangular cross section, the cutting groove is communicated with the upper side of the horizontal channel, and the width of the cutting groove is equal to that of the horizontal channel.

Further, in the in-mold automatic cutting side gate mechanism suitable for the injection mold, an included angle between the cutting groove and the vertical surface is 0-60 degrees.

Further, in the in-mold automatic cutting side gate mechanism suitable for the injection mold, grooves are formed in the respective circumferences of the driven piston and the driving piston, sealing rings are arranged in the grooves, and the sealing rings are extruded and deformed by the matching of the inner side wall of the hydraulic chamber and the piston, so that the sealing rings are respectively tightly attached to the inner side wall and the piston.

Further, in the in-mold automatic cutting side gate mechanism suitable for the injection mold, a compression spring is sleeved on the outer side of the rod body of the cutter bar in the driven hydraulic chamber; the front end of the cutter bar is provided with a cutting edge, and the matching relationship between the rod body of the cutter bar and the cutting groove is transition matching.

Further, in the above-mentioned automatic cutout side runner mechanism in mould that is suitable for injection mold, go up the mould and be located profile department and inwards seted up a plurality of positioning groove, the lower mould is located profile department and is equipped with a plurality of outside convex location archs, positioning groove and the bellied position in location and shape one-to-one.

In a preferred embodiment of the present invention, the cross-sectional areas of the driven hydraulic chambers are equal, the cross-sectional area of the driving hydraulic chamber is N times the cross-sectional area of the driven hydraulic chamber, and N is a quantity value of the driven hydraulic chambers.

In another preferable aspect of the present invention, the cross-sectional area of each of the slave hydraulic chambers is different, and the cross-sectional area of the master hydraulic chamber is the sum of the cross-sectional areas of all the slave hydraulic chambers.

The invention has the beneficial effects that:

the multi-side sprue runner structure is reasonable in structural design, a plurality of side sprue runners are designed for large-size injection molding parts with large length-width ratios, driven hydraulic chambers with the same or different specifications and cutting grooves with the same or different gradients are arranged above each side sprue runner, when cutting operation is needed, a driving piston is driven by a driving push rod to move, a cutter bar is driven by oil to act, simultaneous in-mold cutting of the multi-side sprue runners is achieved, and the operation is convenient.

Of course, it is not necessary for any one product that embodies the invention to achieve all of the above advantages simultaneously.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention as a whole;

FIG. 2 is a schematic view of the internal structure of the upper mold of the present invention;

FIG. 3 is a schematic view of the internal structure of the lower mold of the present invention;

FIG. 4 is an enlarged view of a portion of the structure of FIG. 1;

in the drawings, the components represented by the respective reference numerals are listed below:

1-upper die, 2-lower die, 3-upper die cavity, 4-lower die cavity, 5-forming lug, 6-sprue block, 7-straight sprue channel, 8-side sprue channel, 9-cutting groove, 10-driven hydraulic chamber, 11-driving hydraulic chamber, 12-oil path, 13-driven piston, 14-cutter bar, 15-compression spring, 16-driving piston, 17-driving push rod and 18-cooling water channel.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

Referring to fig. 1-4, the present embodiment is an in-mold automatic cutting side gate mechanism for an injection mold, including an upper mold 1 and a lower mold 2, wherein an upper cavity 3 is disposed inside the upper mold 1, and a lower cavity 4 and a forming protrusion 5 with a cooling water channel 18 are disposed inside the lower mold 2. The upper cavity and the lower cavity jointly form a cavity, and the ratio of the length value to the width value of the cavity is 3-8. The upper die 1 is internally provided with a plurality of positioning grooves at the molded surface, the lower die 2 is provided with a plurality of positioning bulges protruding outwards at the molded surface, and the positioning grooves correspond to the positioning bulges in position and shape one to one.

In this embodiment, the upper die 1 is provided with a straight sprue channel 7 inside, the top end of the straight sprue channel 7 is provided with a sprue block 6, and two side sprue channels 8 are connected between the bottom end of the straight sprue channel 7 and the upper cavity 3. A driven hydraulic chamber 10 is communicated above each side sprue channel 8 through a cutting groove 9, a driving hydraulic chamber 11 is arranged inside the upper die 1, and each driven hydraulic chamber 10 is communicated with the driving hydraulic chamber 11 through an oil path 12.

In this embodiment, a slidable slave piston 13 is provided in the slave hydraulic chamber 10, and a cutter bar 14 slidably restricted in the cutting groove 9 is fixed to the bottom end of the slave piston 13. The front end of cutter arbor 14 is equipped with the cutting edge, and the body of rod and the cut-off groove cooperation relation of cutter arbor 14 are transition fit, can carry out the pressure release of certain degree and mend the pressure.

In this embodiment, an active push rod 17 and an active piston 16 capable of sliding are disposed in the active hydraulic chamber 11, and the active piston 16 is fixedly connected to a movable end of the active push rod 17. The driving push rod 17 is a hydraulic push rod, and an oil inlet and an oil return port of the hydraulic push rod are arranged at the side end of the upper die 1.

In this embodiment, the channel of the side sprue channel 8 near the upper cavity 3 is a horizontal channel with a rectangular cross section, the cutting groove 9 is communicated with the upper side of the horizontal channel, and the width of the cutting groove 9 is equal to that of the horizontal channel. The length directions of the two cutting grooves 9 are parallel to the vertical plane.

In this embodiment, grooves are formed in the circumferential direction of each of the driven piston 13 and the driving piston 16, sealing rings are installed in the grooves, and the sealing rings are extruded and deformed by the cooperation of the inner side wall of the hydraulic chamber and the piston, so that the sealing rings are respectively tightly attached to the two.

In this embodiment, the cross-sectional areas of the slave hydraulic chambers 10 are equal to each other, the cross-sectional area of the master hydraulic chamber 11 is N times the cross-sectional area of the slave hydraulic chamber 10, and N is the number of the slave hydraulic chambers 10.

One specific application of this embodiment is: two side sprue runners 8 are designed aiming at large-size injection molding parts with large length-width ratios, driven hydraulic chambers 10 with the same specification and cutting grooves 9 with the same gradient are arranged above the two side sprue runners 8, when cutting operation is needed, a driving push rod 17 is utilized to drive a driving piston 16 to displace, two cutter bars 14 are driven to move through oil, simultaneous in-mold cutting of the multi-side sprue runners is realized, and the operation is convenient.

Example two

Referring to fig. 1-4, the present embodiment is an in-mold automatic cutting side gate mechanism for an injection mold, including an upper mold 1 and a lower mold 2, wherein an upper cavity 3 is disposed inside the upper mold 1, and a lower cavity 4 and a forming protrusion 5 with a cooling water channel 18 are disposed inside the lower mold 2. The upper cavity and the lower cavity jointly form a cavity, and the ratio of the length value to the width value of the cavity is 3-8. The upper die 1 is internally provided with a plurality of positioning grooves at the molded surface, the lower die 2 is provided with a plurality of positioning bulges protruding outwards at the molded surface, and the positioning grooves correspond to the positioning bulges in position and shape one to one.

In this embodiment, the upper die 1 is provided with a straight sprue channel 7 inside, the top end of the straight sprue channel 7 is provided with a sprue block 6, and two side sprue channels 8 are connected between the bottom end of the straight sprue channel 7 and the upper cavity 3. A driven hydraulic chamber 10 is communicated above each side sprue channel 8 through a cutting groove 9, a driving hydraulic chamber 11 is arranged inside the upper die 1, and each driven hydraulic chamber 10 is communicated with the driving hydraulic chamber 11 through an oil path 12.

In this embodiment, a slidable slave piston 13 is provided in the slave hydraulic chamber 10, and a cutter bar 14 slidably restricted in the cutting groove 9 is fixed to the bottom end of the slave piston 13. The front end of cutter arbor 14 is equipped with the cutting edge, and the body of rod and the cut-off groove cooperation relation of cutter arbor 14 are transition fit, can carry out the pressure release of certain degree and mend the pressure. The body of rod outside cover that cutter arbor 14 is located the driven hydraulic chamber 10 in place is equipped with compression spring 15, and compression spring 15's design can ensure that the reseing of cutter arbor 14 goes on smoothly.

In this embodiment, an active push rod 17 and an active piston 16 capable of sliding are disposed in the active hydraulic chamber 11, and the active piston 16 is fixedly connected to a movable end of the active push rod 17. The driving push rod 17 is a hydraulic push rod, and an oil inlet and an oil return port of the hydraulic push rod are arranged at the side end of the upper die 1.

In this embodiment, the channel of the side sprue channel 8 near the upper cavity 3 is a horizontal channel with a rectangular cross section, the cutting groove 9 is communicated with the upper side of the horizontal channel, and the width of the cutting groove 9 is equal to that of the horizontal channel. The included angles between the two cutting grooves 9 and the vertical surface are respectively 30 degrees and 60 degrees.

In this embodiment, grooves are formed in the circumferential direction of each of the driven piston 13 and the driving piston 16, sealing rings are installed in the grooves, and the sealing rings are extruded and deformed by the cooperation of the inner side wall of the hydraulic chamber and the piston, so that the sealing rings are respectively tightly attached to the two.

In the present embodiment, the cross-sectional area of each of the slave hydraulic chambers 10 is not equal, and the cross-sectional area of the master hydraulic chamber 11 is the sum of the cross-sectional areas of all the slave hydraulic chambers.

One specific application of this embodiment is: two side sprue runners 8 are designed aiming at large-size injection molding parts with large length-width ratios, driven hydraulic chambers 10 with different specifications and cutting grooves 9 with different gradients are arranged above the two side sprue runners 8, when cutting operation is needed, a driving push rod 17 is utilized to drive a driving piston 16 to displace, two cutter rods 14 are driven to move through oil, the multi-side sprue runners are cut off in a mold simultaneously, and the operation is convenient.

The preferred embodiments of the present invention disclosed above are intended to facilitate the explanation of the present invention only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.