CN100528527C - Plastic injecting mold for casting system with low power consumption - Google Patents

Abstract

The plastic injecting mold for casting system with low power consumption includes a mold frame and forming part; and a casting system possessing a two-purpose sprue cover to shorten the main flow channel as possible, a protecting cover between the front sprue cover and the material discharging plate to reduce friction and prolong the service life of mold, a cold material discharger on the material discharging plate, a spring to push the piston for the material to leave from the sprue pushing plate, a wear resistant sprue crochet hook cover to reduce friction, ox horn-shaped insert blocks inside the female mold to improve appearance and with ox horn-shapedrunning channel communicated with the sprue and forming cavity in the female mold.

Description

A plastic injection mold with an energy-saving and consumption-reducing pouring system

technical field

The invention relates to a plastic mold, in particular to a plastic injection mold with an energy-saving and consumption-reducing pouring system.

Background technique

The current three-plate plastic mold generally includes a mold base composed of upper and lower templates, mold feet, stripper plates, ejector members, guide posts, and guide sleeves. The cavity A plate and cavity B plate are installed in the cavity. Forming parts composed of female and male molds in plate A and cavity B, and pouring system. The function of the gating system is to fill the cavity with the plastic in the molten state smoothly and smoothly, so that the gas in the cavity can be discharged smoothly, and in the process of filling and solidification, the pressure can be transmitted to various parts of the plastic part, so as to Obtain tightly organized plastic parts.

The existing gating system generally consists of a sprue sleeve, a runner, a sprue hook, and a gate. As an important part of the gating system, the main functions of the sprue sleeve are: 1. Matching with the nozzle of the machine tool, the injection machine material The plastic in the barrel transitions into the mold. 2. As the positioning of molds and injection molding machines. 3. As the main channel of the gating system. In the existing three-plate injection mold, the length of the main channel is usually determined by the thickness of the upper template of the mold base and the thickness of the stripper plate. Due to the strength problem considered in the design process, the upper template is generally 30mm and increases with the increase of the mold base. Large and thick, coupled with the stripper plate, makes the sprue in the sprue sleeve relatively long, generally between 60-100mm. The excessively long main channel causes the loss of pressure and heat, which increases the recovery of cold material. In addition, the friction part between the sprue sleeve and the stripper plate has no demoulding slope, is easy to rub, and is easy to produce batch fronts, etc., resulting in increased demoulding force and increased power consumption of the equipment, which is not conducive to energy saving and time saving. In addition, there is no gate sleeve sheath on the stripper plate, which is not conducive to the maintenance and replacement of the mold. It is not convenient to add sprue material in the sprue sleeve.

In the existing plastic mold pouring system, the spout hooks are generally installed on the upper formwork and slidably fit with the stripper plate. Although the spout hooks and the stripper plate are slidingly fitted, there is still friction between the two. The hardness of the crochet needles of the upper nozzle is higher than that of the stripper plate. Over time, the stripper plate wears out quickly and needs to be replaced frequently, which reduces production efficiency and increases the manufacturing cost of plastic parts.

In the existing plastic mould, the nozzle material in the plastic mold flow channel is often easily stuck to the stripper plate after being separated from the nozzle hook. Therefore it must be picked manually or by manipulators, which increases the operator's potential safety hazard, prolongs the molding time, and reduces production efficiency.

The gates in existing injection molds usually use latent gates, side gates, point gates, etc. These gates have the disadvantages of damaging the appearance of the product or requiring processing after the product is molded, resulting in high production costs. Fits part molds.

Contents of the invention

The object of the present invention is to provide an energy-saving and consumption-reducing pouring system with short main channel, automatic drop-off of nozzle material, no damage to product appearance at the gate position, no need for reprocessing after molding, reinforced mold movable parts and easy replacement and maintenance. Plastic injection molds to solve the problems in the existing plastic injection mold gating system that the main channel is too long, the nozzle material is difficult to fall off automatically, the crochet needle at the nozzle is easy to move, the gate damages the product appearance or the gate position needs to be reprocessed, Mold maintenance is difficult and the cycle is long.

The purpose of the present invention can be achieved through the following technical solutions:

A plastic injection mold with an energy-saving and consumption-reducing pouring system, comprising:

Formwork consisting of upper and lower templates, mold feet, stripper plates, ejector components, guide posts, and guide sleeves;

A molded part consisting of a cavity A plate and a cavity B plate, and a female and a male mold installed in the cavity A plate and the cavity B plate;

Gating system;

Among them, the cavity B plate is connected with the lower formwork through mold feet and fasteners, and the guide column is installed on the upper formwork, and passes through the guide sleeve arranged on the stripper plate and the cavity A plate to make the upper formwork and the stripper plate, The cavity A plate is connected; the stripper plate is also equipped with a tie rod to separate the cavity A and B plates; the mold frame also includes a push plate and a nozzle thimble, and the nozzle thimble is fixed on the push plate, and the upper end passes through the cavity The thimble hole on the B plate; the mold clamping guide post and the male mold are installed on the cavity B plate, the female mold and the mold clamping guide sleeve are arranged on the cavity A plate, and the mold clamping guide post is inserted into the mold clamping guide sleeve. The female and male molds can be accurately closed; molding cavities are set on the female mold and the male mold; the pouring system includes the sprue sleeve, the runner set on the cavity A plate, the sprue crochet and the mold set on the female mold. The sprue sleeve is installed on the upper template and communicates with the runner through the center hole in the center of the stripper plate. The runner is arranged on the upper surface of the cavity A plate and is connected with the spot pouring The mouth is connected, and the crochet hooks of the nozzle are fixed on the upper formwork and pass through the crochet holes on the stripper plate. It is characterized in that:

The sprue sleeve is a dual-purpose sprue sleeve installed in the sprue sleeve installation hole in the center of the upper formwork, and there is a nozzle jack in the dual-purpose sprue sleeve; the bottom surface of the nozzle jack is flat, There is a nozzle positioning groove at the center of the bottom surface of the nozzle socket; the front end face of the sprue bushing is a plane, and a conical protrusion is arranged at the center of the front end face; There is an annular groove for the crochet function of the sprue; the nozzle socket in the sprue sleeve, the nozzle positioning groove and the main channel are located on the same axis.

In the dual-purpose sprue sleeve, sprue hooks and side positioning pins are also arranged.

In order to solve the shortened service life of the sprue sleeve and the stripper plate due to friction between the sprue sleeve and the stripper plate, and to solve the problem of convenient assembly and maintenance between the sprue sleeve and the mold, the center of the stripper plate A sheath is installed in the hole to facilitate assembly and maintenance between the sprue sleeve and the stripper plate.

The sprue bushing installation hole in the center of the upper formwork is a stepped hole, so as to facilitate the installation and positioning of the dual-purpose sprue bushing, and the upper half of the dual-purpose sprue bushing is located in the sprue bushing installation hole. A groove capable of accommodating the entry of the lower half of the dual-purpose sprue sleeve is also provided at the center of the stripper plate, and the groove is concentric with the central hole. The purpose of doing this can make the dual-purpose sprue sleeve coincide with the upper template and the stripper plate, and can move flexibly.

During installation, the sheath is fixed in the center hole of the stripper plate and moves together with the stripper plate, and the dual-purpose sprue sleeve is fixed on the bottom plate. Since part of the sprue sleeve is located in the upper mold plate and the other part is located in the stripper plate, and there is also a nozzle socket in the sprue sleeve, so that the mouth of the extended nozzle on the injection machine can be as close as possible to the flow channel, and the The sprue is shortened to the most ideal length, so the sprue sleeve of the present invention saves 80% of raw materials compared with the common sprue sleeve. In addition, the shortening of the sprue also reduces the loss of pressure and heat, and reduces the weld line. The bottom surface of the nozzle socket in the sprue bushing is plane, which can conveniently add spout hooks, and can also be positioned with side positioning pins. The front end of the dual-purpose sprue sleeve adopts an annular groove, which solves the problem that the sprue cannot be separated from the cavity due to the inability to add sprue hooks to the center point sprue. The center of the front end of the sprue sleeve adopts the design style of the cone, and the sheath is put on, which makes the sprue sleeve easy to assemble with the mold, easy to replace, and reduces repeated friction with the stripper plate, thereby improving the service life of the mold and reducing The maintenance cost of the mold is reduced.

In order to solve the problem that the nozzle material often sticks to the stripping plate after it leaves the nozzle crochet needle, it needs to be picked manually or by a robot, which increases the safety hazard of the operator, prolongs the molding time and reduces the production efficiency. The stripping plate is equipped with a cold material shedding device to automatically separate the nozzle material from the stripping plate.

The cold material shedding device includes an outer cylinder, a piston, and a spring. The piston moves in the piston chamber of the outer cylinder and compresses the spring in the piston chamber, and a positioning pin is arranged on the piston. The piston is a hollow cylinder structure with the bottom of the cylinder facing outwards. The cylinder port of the outer cylinder is a necking, and the necking is matched with the piston clearance.

In order to install the cold material dropper on the stripping plate of the three-plate injection mold, a threaded hole is opened in the center of the bottom of the outer cylinder.

When installing the cold material dropper, open an installation blind hole and a bolt hole matching the outer diameter of the outer cylinder at an appropriate position on the stripper plate of the three-plate injection mold, press the cold material dropper into the installation blind hole, and use A bolt passes through the bolt hole and is screwed into the threaded hole on the bottom of the outer cylinder and tightened so that the cold material stripper can be installed on the stripper plate.

When demolding, the cold material dropper of the utility model can use the elastic deformation of the spring to push the piston to bounce the nozzle material off the stripping plate at the moment when the nozzle material is separated from the nozzle hook needle, so that the nozzle material will fall off automatically without manual or Picking by manipulator ensures safe production, shortens molding time and improves production efficiency.

In order to solve the problem that the stripping plate is worn and needs to be repaired due to the friction between the stripping needle and the stripping plate, and the maintenance cost increases, the present invention installs a wear-resistant spout hook sleeve in the hook hole of the stripping plate, through which the spout hook can wear Over-wearing spout crochet cover. The shape of the wear-resistant nozzle crochet needle cover is a cone, and the two ends are planes. The wear-resistant nozzle crochet needle cover is fixed on the stripper plate and moves together with the stripper plate. After adding the wear-resistant spout hook cover, the direct friction between the crochet needle and the stripper plate is avoided. When the spout hook and the wear-resistant spout hook set are worn out due to frequent movement under the impact of high temperature and high pressure of the material flow, they can be replaced at any time without the need for stripping The plate is repaired, which reduces the maintenance cost of the mold and improves the production efficiency.

In order to solve the disadvantages of existing latent gates, side gates, point gates, etc. that damage the appearance of the product and require processing after the product is formed, resulting in high production costs, the present invention has several horn-shaped inlays in the male mold. Assembled inserts, several ox-horn-shaped inlaid inserts are part of the male mold, assembled with other parts of the male mold and installed in the cavity B plate, the horn-shaped inlaid inserts are provided with sprues, The runner communicates with the point gate on the female mold and the molding cavity.

The sprue in the horn-shaped mosaic insert is in the shape of a horn, wherein the tip of the horn communicates with the molding cavity, and the heel of the horn communicates with the point gate arranged on the male mold.

The horn-shaped mosaic insert is composed of left and right parts that are mirror-image symmetric. The left and right parts are connected by positioning pins. Each part is provided with a horn-shaped groove, and the horn-shaped two parts form a sprue. The two-half design scheme makes it easy to process the horn-shaped mosaic-type inserts, accurately position the left and right sides, and facilitate assembly and replacement. After injection molding, the gate does not need to be post-processed and does not damage the appearance of the product. It can be placed at any position and angle on the mold, which solves the difficulty of traditional gate processing, difficult maintenance, damage to the appearance of the product, and reprocessing of the gate after product molding. Position problem, improve production efficiency and reduce production cost.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a structural schematic diagram of the cold material shedding device described in the invention.

Fig. 3 is a structural schematic diagram of the dual-purpose sprue sleeve described in the invention.

Fig. 4 is a structural schematic diagram of the wear-resistant spout crochet sheath of the invention.

Fig. 5 is a schematic structural view of the horn-shaped mosaic inlay of the present invention.

Fig. 6 is a structural schematic diagram of the left part of the horn-shaped mosaic-style inlay.

Fig. 7 is a structural schematic diagram of the right part of the horn-shaped mosaic-style inlay.

Detailed ways

Referring to Fig. 1, a plastic injection mold with an energy-saving and consumption-reducing pouring system includes an upper template 11, a lower template 12, a mold foot 13, a stripper plate 14, an ejector member 15, a guide post 16, and guide sleeves 17a, 17b Formwork formed; molding parts composed of cavity A plate 21 and cavity B plate 22 and male and female molds 23 and 24 installed in cavity A plate 21 and cavity B plate 22; pouring system.

The cavity B plate 22 is fixedly connected with the lower formwork 12 through the die foot 13 and fasteners, and the guide post 16 is fixedly installed on the upper formwork 11, and passes through the guide sleeve arranged on the stripping plate 14 and the cavity A plate 21 17a and 17b connect the upper template 11 with the stripping plate 14 and the cavity A plate 21; the stripping plate 14 and the cavity A plate 21 can slide on the guide post 16.

Also installed on the stripping plate 14 are the pull bars 18 that make the mold cavity A, B plates 21, 22 split; on the cavity B plate 22, there are also holes 221, 222 that can accommodate the guide post 16 and the pull rod 18, which are combined. During molding, the redundant guide posts 16 and tie rods 18 can be accommodated in the holes 221 and 222 respectively.

Also comprise the ejector device 15 that is made of push plate 151 and nozzle thimble 152 in the whole formwork, nozzle thimble 152 is fixed on the push plate 151, and the upper end passes through the thimble hole 223 on the mold cavity B plate 22; The push rod on the injection machine pushes the push plate 151 to move forward, and the push plate 151 pushes the runner thimble 152 to eject the workpiece.

Clamping guide post 224 and female mold 24 are housed in cavity B plate 22, and male mold 23 and clamping guide sleeve 211 are arranged on cavity A plate 21, and clamping guide post 224 is inserted in the clamping guide sleeve 211, makes The female and male molds 24, 23 can be matched accurately.

Forming cavities 231 and 241 are provided on the male mold 23 and the female mold 24 .

The pouring system includes a sprue bushing 31 , a runner 212 arranged on the cavity A plate 21 , a runner hook 32 and a point gate 242 arranged on the female mold 24 .

Referring to Fig. 3, the sprue bushing 31 is a dual-purpose sprue bushing installed in the sprue bushing installation hole 111 in the center of the upper template 11, and there is a nozzle jack 311 in the dual-purpose sprue bushing; the bottom surface of the nozzle jack 311 312 is a plane, and there is a nozzle positioning groove 313 at the center of the bottom surface of the nozzle jack 311; There is a main channel 316 in the center and an annular groove 317 for the function of sprue crochet at the front end of the cone protrusion 315; the nozzle insertion hole 311, the nozzle positioning groove 313 and the main channel 316 in the dual-purpose sprue sleeve are located on the same axis .

Referring to FIG. 1 , a sheath 142 is installed in the center hole 141 of the stripper plate 14 to facilitate assembly and maintenance between the dual-purpose sprue sleeve 31 and the stripper plate 14 . The central hole 141 of the stripper plate 14 is a stepped hole, so as to facilitate the installation and fixing of the sheath 142 .

The sprue sleeve installation hole 111 in the center of the upper template 11 is a stepped hole, so as to facilitate the installation and positioning of the dual-purpose sprue sleeve.

The upper part of the sprue bushing 31 has a stepped shape and is located in the sprue bushing installation hole 111 .

In the dual-purpose sprue bushing, sprue crochet needle 318 and side positioning needle 319 are also housed.

A groove 143 capable of accommodating the lower half of the dual-purpose sprue sleeve is also provided at the center of the stripper plate 14 , and the groove 143 is concentric with the center hole 141 . The purpose of doing like this can make the dual-purpose sprue sleeve coincide with the upper template 11 and the stripper plate 14, and can move flexibly.

Referring to Fig. 1, during installation, the sheath 142 is fixed in the central hole 141 of the stripper plate 14 and moves together with the stripper plate 14, the dual-purpose sprue sleeve is fixed on the upper formwork 11, and the sprue 316 on it is arranged with the The runner 212 of the cavity A plate 21 is connected, and the runner 212 is communicated with the point gate 242 on the female mold 24 again.

Referring to Fig. 1 and Fig. 4, a wear-resistant nozzle crochet needle cover 33 is housed in the hook hole 144 of the stripper plate 14 and moves together with the stripper plate 14. The profile of wear-resisting spout crochet needle cover 33 is a cone, and the two end faces are planes. Nozzle crochet needles 32 are fixed on the upper template 11 and pass through the wear-resistant nozzle crochet needle cover 33 on the stripper plate 14. After increasing the wear-resistant nozzle crochet needle cover 33, the direct friction between the crochet needles 32 and the stripper plate 14 is avoided.

Referring to Fig. 1, the cold material shedding device 4 that makes the outlet material break away from the stripping plate automatically is installed on the stripping plate 14.

Referring to FIG. 3 , the cold material shedding device 4 includes an outer cylinder 41 , a piston 42 , and a spring 43 . The piston 42 is a hollow cylinder, and a positioning hole 421 is opened on the outer ring wall of the piston 42 . The cylinder mouth of the outer cylinder 41 is a shrinkage 411, and a threaded hole 412 is opened at the center of the cylinder bottom.

The piston 42 moves in the piston chamber 412 of the outer cylinder 41, and the bottom of the cylinder faces outwards, and the spring 43 is compressed in the piston chamber 412, and the bottom of the cylinder faces outwards. The constriction 411 is in clearance fit with the piston 42 .

A positioning pin 422 is fixed in the positioning hole 421 . In order to facilitate the installation of the positioning pin 422 , a radial mounting hole 4121 is opened on the cylinder wall 412 of the outer cylinder 41 , and the positioning pin 421 is inserted from the mounting hole 4121 and driven into the positioning hole 421 on the piston 42 .

When the piston 42 rises to the limit position, the positioning pin 422 is restricted by the constriction 411 on the outer cylinder 41, so that the piston 42 no longer rises.

When the cold material stripper 4 is installed, a blind installation hole 144 and a bolt hole 145 matching the outer diameter of the outer cylinder 41 are opened at an appropriate position on the stripper plate 14, and the cold material stripper 4 is pressed into the installation blind hole 144 In the process, pass the bolt hole 145 with a bolt 146 and screw in the threaded hole 412 on the bottom of the outer cylinder 41 and tighten to make the cold material shedding device 4 installed on the stripping plate 14.

When demoulding, the cold material dropper can use the elastic deformation of the spring 43 to push the piston 42 to bounce the nozzle material 5 away from the stripping plate 14 at the moment when the nozzle material 5 is separated from the nozzle hook 32, so that the nozzle material 5 will automatically fall off without having to Picking with manual or mechanical hands ensures safe production, shortens molding time and improves production efficiency.

During re-molding, the cavity A plate 21 is pushed, and the piston 42 is pressed back into the outer cylinder 41 again, waiting for the next action.

Referring to Fig. 1, in order to solve the existing latent gates, side gates, point gates, etc. that damage the appearance of the product, it is necessary to process the product after molding, resulting in high production costs. Horn-type mosaic type insert 6, several ox-horn type mosaic type inserts 6 belong to a part of male mold 23, are installed in the cavity B plate 22 after assembling with other parts of male mold 23.

Referring to Fig. 5, Fig. 6 and Fig. 7, the two parts 61, 62, which are mirror-symmetrical, of the horn-shaped mosaic insert 6 are combined together by positioning pins 63, and horns are arranged on each part 61, 62. Type grooves 61a and 62a, two parts of horn-shaped grooves 61a and 62a constitute a runner 64 in the shape of horns. The tip of the horn-shaped runner 64 communicates with the molding cavity 231 , and the corner heel communicates with the point gate 242 provided on the female mold 24 . Adopting such a structure, the horn-shaped mosaic insert 6 is convenient to process, the left and right positioning is accurate, and the assembly and replacement are convenient. After injection molding, the gate does not need to be post-processed and does not damage the appearance of the product. It can be placed at any position and angle on the mold, which solves the difficulty of traditional gate processing, difficult maintenance, damage to the appearance of the product, and reprocessing of the gate after product molding. Position problem, improve production efficiency and reduce production cost.

Certainly, those skilled in the art can make various changes on the basis of the above-mentioned embodiments without spending creative efforts, and the purpose of the present invention can also be achieved. However, the above-mentioned various changes should obviously be within the protection scope of the claims of the present invention.

Claims (10)

1, a kind of plastic injecting mold with energy-saving and cost-reducing running gate system comprises:

The mould bases that constitutes by upper and lower template, mould pin, stripper plate, liftout component and guide pillar, guide pin bushing;

By die cavity A plate and die cavity B plate and be installed in die cavity A plate and die cavity B plate in the profiled part that constitutes of yin, yang mould;

Running gate system;

Wherein die cavity B plate links to each other with lower bolster by mould pin and securing member, and guide pillar is installed on the cope match-plate pattern, and passes and be arranged on stripper plate and with guide pin bushing on the die cavity A plate cope match-plate pattern linked to each other with stripper plate, die cavity A plate; The pull bar that makes die cavity A, B plate divide mould also is installed on stripper plate; Also comprise push pedal and mouth of a river thimble in the mould bases, mouth of a river thimble is fixed in the push pedal, and the centre hole on the die cavity B plate is passed in the upper end; On die cavity B plate matched moulds guide pillar and formpiston are installed, die cavity A plate is provided with former and matched moulds guide pin bushing, and the matched moulds guide pillar inserts in the matched moulds guide pin bushing, makes yin, yang mould matched moulds exactly; Former and formpiston are provided with the moulding die cavity; Running gate system comprises sprue bush, be arranged on runner, the mouth of a river crochet hook on the die cavity A plate and be arranged on some cast gate on the former, sprue bush is installed on the cope match-plate pattern and in the centre bore through the stripper plate center and communicates with described sprue, runner is arranged in the upper surface of die cavity A plate and is communicated with some cast gate on the former, mouth of a river crochet hook is fixed on the cope match-plate pattern and passes the crochet hook hole that is opened on the stripper plate, it is characterized in that:

Described sprue bush is one to be installed in the dual-purpose sprue bush in the sprue bush installing hole at cope match-plate pattern center, in described dual-purpose sprue bush a nozzle receptacle is arranged; The bottom surface of described nozzle receptacle is the plane, and a nozzle detent is arranged at the center of nozzle receptacle bottom surface; The front end face of described dual-purpose sprue bush is a plane, and be provided with an awl at the center of front end face protruding; Have a sprue at the protruding center of awl and have the annular groove of mouth of a river crochet hook effect together at the protruding front end of awl; Nozzle receptacle, nozzle detent and sprue in the dual-purpose sprue bush are positioned on the same axis.

2, a kind of plastic injecting mold with energy-saving and cost-reducing running gate system as claimed in claim 1 is characterized in that: be equipped with one and be convenient to assembling and the sheath that keeps in repair between dual-purpose sprue bush and the stripper plate in the centre bore of described stripper plate.

3, a kind of plastic injecting mold as claimed in claim 1 with energy-saving and cost-reducing running gate system, it is characterized in that: the sprue bush installing hole at described cope match-plate pattern center is a stepped hole, described dual-purpose sprue bush the first half is positioned at this sprue bush installing hole; Also be provided with a groove that can hold dual-purpose sprue bush the latter half at the center of stripper plate, groove is concentric with described centre bore.

4, a kind of plastic injecting mold with energy-saving and cost-reducing running gate system as claimed in claim 1 or 2 is characterized in that: the cold burden that makes mouth of a river material the break away from stripper plate automatically device that comes off is installed on described stripper plate.

5, a kind of plastic injecting mold as claimed in claim 4 with energy-saving and cost-reducing running gate system, it is characterized in that: the described cold burden device that comes off comprises outer shell, piston, spring, piston is active in the plunger shaft of outer shell and with spring and is compressed in this plunger shaft, is provided with alignment pin on piston.

6, a kind of plastic injecting mold with energy-saving and cost-reducing running gate system as claimed in claim 5, it is characterized in that: the cylinder bottom center at outer shell has a screwed hole.

7, a kind of plastic injecting mold with energy-saving and cost-reducing running gate system as claimed in claim 1 or 2 is characterized in that: a wear-resisting mouth of a river crochet hook cover is housed in the crochet hook hole of described stripper plate, and mouth of a river crochet hook passes wear-resisting mouth of a river crochet hook cover.

8, a kind of plastic injecting mold as claimed in claim 1 or 2 with energy-saving and cost-reducing running gate system, it is characterized in that: in described formpiston, be inlaid with some ox horn type inlaid types and insert, some ox horn type inlaid types are inserted and are belonged to the part of formpiston, be installed in the die cavity B plate after piecing together with the other parts of formpiston, described ox horn type inlaid type is provided with running channel in inserting, and described running channel is communicated with some cast gate and moulding die cavity on the former.

9, a kind of plastic injecting mold as claimed in claim 8 with energy-saving and cost-reducing running gate system, it is characterized in that: the running channel in described ox horn type inlaid type is inserted is an ox horn shape, wherein the top of the horn is communicated with the moulding die cavity, and the angle is followed with the described some cast gate that is arranged on the former and is communicated with.

10, a kind of plastic injecting mold as claimed in claim 9 with energy-saving and cost-reducing running gate system, it is characterized in that: described ox horn type inlaid type is inserted and is combined by the left and right sides two parts that become the mirror image symmetry, left and right sides two parts connect by alignment pin, each part is provided with ox horn type groove again, and two-part ox horn type constitutes running channel.

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