CN111186098A

CN111186098A - Spring push pipe sequential double-demolding mechanism

Info

Publication number: CN111186098A
Application number: CN201811388561.8A
Authority: CN
Inventors: 牟维军
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-11-15
Filing date: 2018-11-15
Publication date: 2020-05-22

Abstract

The spring push pipe sequential double-demolding mechanism consists of a fixed mold part and a movable mold part, wherein the fixed mold part comprises a fixed mold base plate, a fixed mold plate, a spring and a fixed mold base plate; a spring is arranged between the fixed die base plate and the fixed die plate, when the die is opened, the spring loses pressure to bounce and push the fixed die plate to remove the upper end of a product from the fixed die core, and the movable die part comprises a push pipe, a movable die core and a thimble fixing plate; and when the ejector pin is pushed out, the ejector pin slides upwards along the movable mold core to push the cavity of the driven mold plate and the movable mold core out of the mold.

Description

Spring push pipe sequential double-demolding mechanism

Technical Field

The invention relates to the field of mold manufacturing, in particular to a spring push pipe sequential double demolding mechanism.

Background

Because the structure or shape of the product is special, the product may be retained on one side of the movable mold or one side of the fixed mold during mold opening, in this case, the movable mold and the fixed mold have equivalent resistance, and in order to retain the product on one side of the movable mold and achieve the purpose of simplifying the mold mechanism, the mold releasing mechanisms are arranged on both sides of the movable mold and the fixed mold, so the mold releasing mechanism is called as a double mold releasing mechanism. Through search, the chinese patent CN202336970U discloses a spring sequential demolding mechanism for an injection mold, which adopts the return elastic force of a compression spring to open the mold for the second time, so as to break the product and a material handle, and leave the product on a core for smooth demolding. Chinese patent CN102358013A discloses injection mold guide pillar order demoulding mechanism, when it is moulding plastics, the arc pellet shot from a slingshot inlays in the arc recess, the injection molding machine power drives the core board die sinking downstream, the core guide pillar follows the motion, after the cavity board follows and moves certain distance, the distance pin in the cavity board opposite side contacts with the distance groove lower wall on the cavity guide pillar, make the compression spring of arc pellet shot from a slingshot force the compressed inner-contracting, the core board downstream separates with the cavity board, the product is deviate from the cavity and stays on the core, then push away the product out of the mould by the scraping wings. Chinese patent CN102357993A discloses a hook sequential demoulding mechanism of an injection mould, which utilizes the hook lever principle to open the mould for the second time, and the product is smoothly separated from a material handle and a cavity. Chinese patent CN204019901U discloses a sequential demolding composite slide mechanism, which utilizes the lower end of an inclined guide post capable of moving up and down to be inserted on a first slide assembly and a second slide assembly, so that the product is not adhered to a mold during core pulling, and the product is prevented from being pulled or deformed during core pulling. In summary, in the prior art, the mold is opened for the second time by the return elastic force of the compression spring, and the product and the material handle are pulled apart to leave the product on the mold core for releasing. Although the spring is embedded in the arc groove, the compression spring is forced to be compressed, the core plate moves downwards to be separated from the cavity plate, the product is left on the core, and then the product is pushed out of the die by the material pushing plate. Although the drag hook lever principle is utilized, the mold is opened for the second time, and the product is smoothly separated from the material handle and the cavity. And meanwhile, the lower end of the inclined guide post moves up and down to be inserted into the slide component, so that the slide component is not stuck to the mold during core pulling. However, the shapes of the two ends of the product of the plastic injection mold and the metal die-casting mold are not special, when the product is molded, the product is required to be molded on the two sides of the movable mold and the fixed mold, then a part of the product is released by the fixed mold releasing mechanism, finally the product is pulled to the side of the movable mold, and the product is released out of the double demolding mechanism outside the mold by the movable mold releasing mechanism.

Disclosure of Invention

The invention provides a spring push pipe sequential double demoulding mechanism. The die casting mold is special in structural shape of metal die castings and plastic injection parts, and after the mold is opened, whether a product is left in a fixed mold or a movable mold cannot be determined. The principle of selecting the parting surface is that after the mold is opened, a product is left on the movable mold, so that the structure of the mold can be greatly simplified. The spring push tube sequence double demoulding mechanism of the invention considers the special structure shape of the product, so the product is left on the side of the movable mould after the mould is opened, and then the product is pushed out of the mould by the push mechanism of the movable mould, thereby achieving the purpose of simplifying the mould structure. As shown in the figure, because the inner sides and the outer sides of the two ends of the product are provided with the same inclined surfaces, and the sizes of the inclined surfaces of the inner sides and the outer sides of the two ends of the product are the same, if the conventional die mechanism is adopted to complete the casting molding, the molded product can be left on the movable die side or the fixed die side, and in order to ensure that the molded product is left on the movable die side after the die is opened, the spring push tube sequential double demolding mechanism is adopted to complete the demolding of the product. The technical scheme is as follows: the spring is arranged between the fixed die base plate and the fixed die plate, the push pipe is arranged on the movable die, when the die is opened, the fixed die plate is pushed towards the movable die due to the spring bouncing caused by the pressure loss of the spring, so a product wrapped on the fixed die core is pushed out by the pushing force of the fixed die plate, when the product is separated from the fixed die core, the limiting screw arranged on the fixed die side limits the fixed die plate to not move towards the movable die, the outer side surface of the upper end of the product is also adhered to the side wall of the cavity of the fixed die plate, the movable die moves backwards continuously, the outer side surface of the lower end of the product is adhered to the side wall of the cavity of the movable die plate, the inner side of the lower end of the product is wrapped on the movable die core, the outer side of the lower end of the product is also adhered to the side wall of the cavity of the movable die, therefore, the wrapping, the reverse buckling part of the material pulling rod hooks the poured and solidified material. In the process of continuously opening the die, the resistance of the lower end of the product is far greater than that of the upper end of the product, so that the upper end of the product is smoothly separated from the cavity of the fixed die plate. After the product is separated from the cavity of the fixed die plate, the product is left on the movable die side, and at the moment, a push pipe arranged on the movable die side pushes the product out of the die from the core of the movable die under the action of an ejector plate.

The spring push pipe sequence double demolding mechanism solves the problems that the product is special in structure shape and cannot be determined to be left on one side of a movable mold or one side of a fixed mold.

Spring ejector pin is two demoulding mechanism in proper order, and its beneficial effect is: the fixed die plate is simple in structure, the die is compact in structure and firm and reliable in action, the fixed die plate is made to be firstly separated from the fixed die core by the aid of elastic force of the spring, and then the product is pushed out from the circumferential surface of the lower end face of the product by the aid of the push pipe. The pushing force is large, and meanwhile, the pushing is realized by using the pushing pipe, so that no pushing trace is left on the product, and the appearance quality of the product is good; the die is convenient to manufacture and low in manufacturing cost.

Spring ejector sleeve order pair demoulding mechanism, characterized by: the device comprises a fixed die part and a movable die part; the fixed mold part and the movable mold part are communicated by a guide post 215 arranged on the movable mold part and extending into a connecting hole m arranged on the lower plane of the fixed mold plate 175 in a sliding way. The fixed mold part comprises: the fixed die base plate 115, the first screw 125, the positioning ring 135, the sprue bush 145, the fixed die backing plate 155, the fixed die plate 175, the spring 185, the fixed die core 165 and the limit screw 195; the fixed mold base plate 115 is tightly connected with the fixed mold base plate 155 through a first screw 125, the sprue bush 145 is installed in a stepped hole of the fixed mold base plate 115, after a small end of the sprue bush 145 passes through holes of the fixed mold base plate 115 and the fixed mold plate 175, the lower end surface of the sprue bush 145 is on the same horizontal plane with the lower plane of the fixed mold plate 175, the large end of a main runner inclined hole in the sprue bush 145 is communicated with a branch runner k arranged on the lower plane of the fixed mold plate 175, the branch runner k extends towards the left and right sides and is communicated with a cavity p in the fixed mold plate 175, the positioning ring 135 is tightly connected in a hole in the center of the upper plane of the fixed mold base plate 115 through screws, two stepped holes are symmetrically distributed at the left and right sides of the fixed mold base plate 155, fixed mold cores 165 are installed in the stepped holes, four through holes are symmetrically distributed at four corners of the fixed mold base plate 155, the, the big end of the fixed mold core 165 is positioned in a stepped hole of the fixed mold backing plate 155, the upper plane of the big end of the fixed mold core 165 is tightly attached to the lower plane of the fixed mold base plate 115, the conical part of the fixed mold core 165 extends into the cavity p of the fixed mold plate 175, the gap formed by the combination of the fixed mold core 165 and the fixed mold plate 175 is a molding position at the upper end of a product, the lower part of the fixed mold core 165 is provided with a conical boss t, during mold closing, the conical boss t is inserted into a conical groove h formed at the upper end of the movable mold core 205 to ensure the concentricity of the product, four blind holes are arranged on the upper plane of the fixed mold plate 175 in a tetragonal symmetrical distribution manner, the lower end of the spring 185 is propped against the bottom of the blind hole, the upper end of the spring 185 passes through the fixed mold backing plate 155, the upper end face of the spring is propped against the lower plane of the fixed mold base plate 115, the size of four blind holes formed in the upper plane of the fixed template 175 is the same, four step holes are symmetrically formed in the lower plane of the fixed template 175 in a distributed mode, after the limit screws 195 slide through the step holes formed in the lower plane of the fixed template 175, the upper portions of the limit screws 195 are in threaded fastening connection with the fixed template base plate 155, four limit screws 195 are arranged, the size and the connection relation of the four limit screws 195 are the same, when the fixed template is assembled, the limit screws 195 float in the holes in the lower plane of the fixed template 175, when the fixed template is disassembled, the upper plane of the heads of the limit screws 195 is in contact with the bottom of the holes formed in the lower plane of the fixed template 175, the fixed template 175 is limited to continue moving towards the moving mold, four connecting holes m are symmetrically formed in the lower plane of the fixed template 175, and when the fixed template is assembled, the connecting holes m are in sliding guiding fit with.

The movable mould part comprises: the ejector pin mold comprises a movable mold plate 225, a movable mold carrier plate 235, a mold leg 245, a base plate 335, a movable mold base plate 255, an ejector pin plate 265, an ejector pin fixing plate 275, a push pipe 285, a pulling rod 295, a return rod 315, a second screw 305, a third screw 325, a movable mold core 205 and a guide post 215, wherein the movable mold plate 225, the movable mold carrier plate 235, the mold leg 245, the base plate 335 and the movable mold base plate 255 are fastened and connected by the second screw 305, two step holes are symmetrically distributed on the left side and the right side of the base plate 335, the movable mold core 205 is installed in the step hole of the base plate 335, the ejector pin plate 265 and the ejector pin fixing plate 275 are arranged in a cavity formed by the movable mold carrier plate 235, the mold leg 245 and the base plate 335, the ejector pin plate 265 and the ejector pin fixing plate 275 are fastened and connected by the third screw 325, the step hole is formed in the lower plane of the ejector pin fixing plate 275, the return rods 315 slide through the through holes of the movable die carrier plate 235 and the movable die plate 225, the upper end surfaces of the return rods 315 are contacted with the lower plane of the fixed die plate 175 when the die is assembled, four return rods 315 are symmetrically distributed, the shape and the size of the four return rods 315 are the same, after the pulling rods 295 slide through the holes of the movable die carrier plate 235 and the movable die plate 225, the Z-shaped upside-down buckles at the upper ends of the pulling rods 295 are buckled with pouring congeals, after the push tubes 285 slide through the holes of the movable die carrier plate 235, the front ends of the push tubes 285 slide and are inserted into the holes at the lower part of the movable die plate 225, after the push tubes 285 are inserted into the holes at the lower part of the movable die plate 225, the circumferential surface at the upper ends of the push tubes 285 are contacted with the circumferential surface at the lower end surface of a product, after the movable die core 205 slides through the holes of the push tubes 265, the conical part of the movable die core 205 extends into the cavity of the movable die plate 225, and, the clearance formed between the movable mold core and the cavity of the movable mold plate 225 is a molding position at the lower end of a product, a conical groove h is formed in the center of the upper end surface of the movable mold core 205, during mold closing, a conical boss mounted on the fixed mold core 165 of the fixed mold part is inserted into the conical groove h, the lower end surface of the movable mold core 205 is tightly attached to the upper plane of the movable mold base plate 255, four guide pillar mounting holes are symmetrically distributed in four corners of the movable mold plate 225, the guide pillars 215 are tightly mounted in the guide pillar mounting holes, and after the upper parts of the guide pillars 215 pass through the movable mold plate 225, the upper parts of the guide pillars are slidably inserted into the holes m in the lower plane of the fixed mold plate.

Drawings

The invention is further described below with reference to the accompanying drawings.

Shown in the figure:

FIG. 1 is a schematic sectional view of a spring push tube sequence double demolding mechanism during mold closing and pouring.

Fig. 2 is a schematic cross-sectional view of the spring 185 when it is lifted by the spring 185 to push the stationary platen 175 to push the product off the stationary mold core 165 during the spring push tube sequence double stripper opening.

FIG. 3 is a sectional view of the spring push tube sequence double stripper mechanism, after the fixed mold part is stripped from the product, the connection of the components is opened.

FIG. 4 is a schematic sectional view of a spring push tube sequential double ejector mechanism with a product left on the movable mold side.

FIG. 5 is a schematic sectional view of a spring push tube sequential double ejector mechanism after the product is pushed out by a movable die.

Fig. 6 is a schematic cross-sectional view of a spring push-tube sequential double ejector mechanism after a product is pushed out and ready for mold clamping.

Fig. 7 is a schematic view of the structure of the movable mold core 205 of the spring push-tube sequential double ejector mechanism.

Fig. 8 is a schematic view of a spring push tube sequential double stripper mechanism, stationary mold core 165.

Fig. 9 is a schematic structural diagram of a spring push tube sequential double stripper, push tube 285.

Fig. 10 is a schematic view of the spring push-tube sequential double mold release mechanism, the stationary mold core 165 and the movable mold core 205 being joined together when the molds are closed.

Fig. 11 is a schematic diagram of a spring push tube sequential double stripper mechanism with a moving mold core 205 nested with a push tube 285.

In the drawings, the numerical numbers respectively indicate:

115-fixed die base plate 125-first screw 135-positioning ring

145-sprue bush 155-fixed die backing plate 165-fixed die core

175-fixed mould plate 185-spring 195-limit screw

205-moving die core 215-guide post 225-moving die plate

235-movable die carrier plate 245-die leg 255-movable die base plate

265-thimble plate 275-thimble fixing plate 285-push tube

295-Material pulling rod 305-second screw 315-Return rod

325-third screw 335-backing plate 345-article

p-represents a cavity in the stationary platen 175.

t-represents a conical boss at the lower end of the stationary mold core 165.

m-represents the attachment hole of the lower plane of the stationary platen 175.

h-represents a conical hole in the upper end of the movable core 205.

d-represents a cavity in the moving platen 225.

The specific implementation mode is as follows:

as shown in the figure, the spring push tube sequence double demoulding mechanism is adopted, when the mould is opened, the spring 185 loses pressure to bounce and pushes the fixed mould plate 175 to move towards the moving mould direction, at this time, the pushing force of the fixed mould plate 175 releases a product 345 from the fixed mould core 165, when the mould is opened continuously, when the bottom of a hole in the fixed mould plate 175 is contacted with the upper plane of the head part of the limiting screw 195, the fixed mould plate 175 is limited by the limiting screw 195 and does not move towards the moving mould direction any more. At this time, although the inner side surface of the upper end of the product 345 is separated from the fixed mold core 165, the outer side surface of the product 345 is stuck to the wall of the cavity p of the fixed mold plate 175, the mold opening is continued, at this time, the fixed mold part stops moving, the movable mold part continues moving backward by the injection machine or the die casting machine, at this time, the inner side surface of the lower end of the product 345 is wrapped with the movable mold core 205, the outer side surface of the lower end of the product 345 is stuck to the wall of the cavity d of the movable mold plate 225, and the "z" shape reverse buckle mounted on the upper portion of the pulling rod 295 on the movable mold side is buckled with the casting condensate, at this time, the wrapping force of the lower end of the product 345 is larger than. When the product 345 is pulled to the movable mold side, the ejector mechanism of the mold pushes the push pipe 285 to slide upward along the movable mold core 205 to push the circumference of the lower end surface of the product 345 to eject the product 345 from the sidewall of the cavity d of the movable mold plate 225 and the movable mold core 205.

The construction and connection relationships and the operation principle thereof will be described in detail with reference to the accompanying drawings.

Firstly, constructing a connection relation: the spring push pipe sequential double-demoulding mechanism comprises a fixed mould part and a movable mould part; the fixed mold part and the movable mold part are communicated by a guide post 215 arranged on the movable mold part and extending into a connecting hole m arranged on the lower plane of the fixed mold plate 175 in a sliding way. The fixed mold part comprises: the fixed die base plate 115, the first screw 125, the positioning ring 135, the sprue bush 145, the fixed die backing plate 155, the fixed die plate 175, the spring 185, the fixed die core 165 and the limit screw 195; the fixed mold base plate 115 is tightly connected with the fixed mold base plate 155 through a first screw 125, the sprue bush 145 is installed in a stepped hole of the fixed mold base plate 115, after a small end of the sprue bush 145 passes through holes of the fixed mold base plate 115 and the fixed mold plate 175, the lower end surface of the sprue bush 145 is on the same horizontal plane with the lower plane of the fixed mold plate 175, the large end of a main runner inclined hole in the sprue bush 145 is communicated with a branch runner k arranged on the lower plane of the fixed mold plate 175, the branch runner k extends towards the left and right sides and is communicated with a cavity p in the fixed mold plate 175, the positioning ring 135 is tightly connected in a hole in the center of the upper plane of the fixed mold base plate 115 through screws, two stepped holes are symmetrically distributed at the left and right sides of the fixed mold base plate 155, fixed mold cores 165 are installed in the stepped holes, four through holes are symmetrically distributed at four corners of the fixed mold base plate 155, the, the big end of the fixed mold core 165 is positioned in a stepped hole of the fixed mold backing plate 155, the upper plane of the big end of the fixed mold core 165 is tightly attached to the lower plane of the fixed mold base plate 115, the conical part of the fixed mold core 165 extends into the cavity p of the fixed mold plate 175, the gap formed by the combination of the fixed mold core 165 and the fixed mold plate 175 is a molding position at the upper end of a product, the lower part of the fixed mold core 165 is provided with a conical boss t, during mold closing, the conical boss t is inserted into a conical groove h formed at the upper end of the movable mold core 205 to ensure the concentricity of the product, four blind holes are arranged on the upper plane of the fixed mold plate 175 in a tetragonal symmetrical distribution manner, the lower end of the spring 185 is propped against the bottom of the blind hole, the upper end of the spring 185 passes through the fixed mold backing plate 155, the upper end face of the spring is propped against the lower plane of the fixed mold base plate 115, the size of four blind holes formed in the upper plane of the fixed template 175 is the same, four step holes are symmetrically formed in the lower plane of the fixed template 175 in a distributed mode, after the limit screws 195 slide through the step holes formed in the lower plane of the fixed template 175, the upper portions of the limit screws 195 are in threaded fastening connection with the fixed template base plate 155, four limit screws 195 are arranged, the size and the connection relation of the four limit screws 195 are the same, when the fixed template is assembled, the limit screws 195 float in the holes in the lower plane of the fixed template 175, when the fixed template is disassembled, the upper plane of the heads of the limit screws 195 is in contact with the bottom of the holes formed in the lower plane of the fixed template 175, the fixed template 175 is limited to continue moving towards the moving mold, four connecting holes m are symmetrically formed in the lower plane of the fixed template 175, and when the fixed template is assembled, the connecting holes m are in sliding guiding fit with.

II, the working principle is as follows:

when a product is required to be cast, firstly, the fixed die part of the die is arranged on the side where the injection machine or the die-casting machine cannot move, the movable die part of the die is arranged on the side where the injection machine or the die-casting machine can move, after the die closing and opening conditions and the pushing-out stroke of the fixed die and the movable die are debugged, then the movable die part approaches to the fixed die part for die closing, casting molding, pressure maintaining and feeding are carried out, after cooling and shaping, the injection machine or the die-casting machine drives the movable die part to move backwards, in the action, the fixed die base plate 115 and the fixed die base plate 155 and the fixed die core 165 are stationary because the fixed die base plate 115 and the fixed die base plate. The spring 185 loses pressure during the backward movement of the movable mold part with the injection or die casting machine, so that the spring 185 springs up, the fixed mold plate 175 is pushed by the spring force of the spring 185 to move with the movable mold part, the fixed mold plate 175 pushes the upper end of the article 345 to be detached from the fixed mold core 165 as the fixed mold plate 175 moves toward the movable mold part, the outer surface of the upper end of the article 345 is adhered to the side wall of the cavity p in the fixed mold plate 175, the movable mold part is driven by the injection or die casting machine to move backward, and the fixed mold plate 175 moves to the point that the bottom of the hole in the fixed mold plate 175 collides with the upper plane of the head of the stopper screw 195 under the spring force of the spring 185, and the stopper screw 195 forces the fixed mold plate 175 not to move toward the movable mold. The movable mold part is moved backward further, at this time, the inner surface of the lower end of the product 345 is fitted with the movable mold core 205, the outer surface of the lower end of the product 345 is adhered to the side wall of the cavity p in the movable mold plate 225, and since the "z" shaped reverse of the upper part of the drawing rod 295 installed on the movable mold side is fastened with the pouring condensate, the mold release resistance of the lower end of the product 345 is larger than that of the upper end of the product 345, and during the further backward movement of the movable mold part with the injection or die casting machine, the upper end of the product 345 is released from the side wall of the cavity p in the fixed mold plate 175, and the product 345 is pulled to the movable. And the injection machine or the die-casting machine continuously drives the movable mold part to move backwards, and when the mold opening distance between the movable mold part and the fixed mold part is larger than the height of the product 345 and the pouring condensate height, and the product 345 does not fall out of the mold, the movable mold part stops acting along with the injection machine or the die-casting machine. Meanwhile, the ejector pin 355 of the injection machine or the die casting machine starts to work, the ejector pin 355 of the injection machine or the die casting machine penetrates through the central holes of the driven die holder plate 255 and the backing plate 335, and the ejector pin 355 of the injection machine or the die casting machine pushes the ejector pin plate 265 to drive the return rod 315, the push pipe 285 and the pulling rod 295 which are arranged in the ejector pin fixing plate 275 to move upwards. At this time, the push pipe 285 slides upward along the movable die core 205, and since the circumference of the upper end surface of the push pipe 285 contacts with the circumference of the lower end surface of the product 345, the push pipe 285 pushes the circumference of the lower end surface of the product 345 during the upward movement to detach the product 345 from the side wall of the cavity d of the movable die plate 225 and the movable die core 205, and when the product 345 is detached from the side wall of the cavity d of the movable die plate 225 and the movable die core 205, the product 345 falls out of the die from the lifter 295 by its own weight and the shaking force of the injection or die casting machine. After the primary casting molding, when the mold is reset, the injection machine or the die casting machine drives the movable mold part of the mold to approach the fixed mold part (injection: at this time, the ejector rod 355 of the injection machine or the die casting machine returns to the initial condition) when the movable mold part approaches the fixed mold part, the upper end surface of the return rod 315 installed on the movable mold side contacts with the lower plane of the fixed mold plate 175, when the mold closing is continued, the reverse thrust of the fixed mold plate 175 pushes the return rod 315 to move backwards, then the return rod 315 pushes the ejector pin plate 265 to drive the push pipe 285 and the pull rod 295 installed in the ejector pin fixing plate 275 to return to the initial condition of mold opening, and the upper plane of the movable mold plate 225 contacts with the lower plane of the fixed mold plate 175 in the process of mold closing, so that the pressure of the movable mold plate 225 forces the fixed mold plate 175 and the spring 185 to return to the. After each opening part is completely closed, the injection machine or the die-casting machine carries out the casting molding of the next period to the die.

The above embodiments are not intended to limit the scope of the present invention, and all equivalent structural and equivalent process changes made by using the contents of the present invention are included in the scope of the present invention.

Claims

1. Spring ejector sleeve order pair demoulding mechanism, characterized by: the device consists of a fixed die part and a movable die part; the fixed mold part and the movable mold part are communicated by a guide post 215 arranged on the movable mold part and extending into a connecting hole m arranged on the lower plane of the fixed mold plate 175 in a sliding manner.

2. The spring push tube sequential double stripper mechanism of claim 1, wherein: the fixed mold part comprises: the fixed die base plate (115), a first screw (125), a positioning ring (135), a sprue bush (145), a fixed die base plate (155), a fixed die plate (175), a spring (185), a fixed die core (165) and a limit screw (195); the fixed die base plate (115) is fixedly connected with a fixed die base plate (155) through a first screw (125), the sprue bush (145) is installed in a step hole of the fixed die base plate (115), after the small end of the sprue bush (145) penetrates through via holes of the fixed die base plate (115) and the fixed die plate (175), the lower end face of the sprue bush (145) is on the same horizontal plane with the lower plane of the fixed die plate (175), the large end of a main runner inclined hole in the sprue bush (145) is communicated with a branch runner k arranged on the lower plane of the fixed die plate (175), the branch runner k extends towards the left side and the right side and is communicated with a cavity p in the fixed die plate (175), the positioning ring (135) is fixedly connected in a hole in the center of the upper plane of the fixed die base plate (115) through screws, two step holes are symmetrically distributed at the left side and the right side of the fixed die base plate (155), a fixed die core (165) is installed in the step hole, and four through holes are symmetrically distributed at the four corners of the fixed, the fixed mold core (165) is in a four-stage step shape, the large end of the fixed mold core (165) is located in a step hole of a fixed mold base plate (155), the upper plane of the large end of the fixed mold core (165) is tightly attached to the lower plane of a fixed mold base plate (115), the conical part of the fixed mold core (165) extends into a cavity p of a fixed mold plate (175), a gap formed after the fixed mold core (165) and the fixed mold plate (175) are combined is a forming position at the upper end of a product, the lower part of the fixed mold core (165) is provided with a conical boss t, the conical boss t is inserted into a conical groove h formed in the upper end of a movable mold core (205) during mold closing so as to ensure the concentricity of the product, four blind holes are symmetrically distributed in four directions on the upper plane of the fixed mold plate (175), the lower end of a spring (185) is propped against the bottom of the blind hole, the upper end of the spring (185) penetrates through the fixed mold base plate, the spring (185) is a rectangular spring with good rigidity and strength, the spring (185) is provided with four springs, the four springs (185) are the same in size, four blind holes formed in the upper plane of the fixed template (175) are the same in size, four step holes are symmetrically distributed and upwards formed in the lower plane of the fixed template (175), after the limit screw (195) penetrates through the step hole formed in the lower plane of the fixed template (175) in a sliding mode, the upper part of the limit screw (195) is in threaded fastening connection with the fixed template backing plate (155), the limit screw (195) is provided with four limit screws (195) which are the same in size and connection relation, when the die is closed, the limit screw (195) floats in the hole in the lower plane of the fixed template (175), when the die is opened, the upper plane at the head of the limit screw (195) is in contact with the bottom of the hole formed in the lower plane of the fixed template (175) to limit the fixed template (175) to move towards the movable die continuously, the lower plane of the fixed die plate (175) is also symmetrically provided with four connecting holes m, and when the die is closed, the connecting holes m are in sliding guide fit with a guide post (215) fixedly arranged on one side of the movable die.

3. The spring push tube sequential double stripper mechanism of claim 1, wherein: the movable mold part comprises: the ejector pin die comprises a movable die plate (225), a movable die bearing plate (235), a die pin (245), a base plate (335), a movable die base plate (255), an ejector pin plate (265), an ejector pin fixing plate (275), a push pipe (285), a material pulling rod (295), a return rod (315), a second screw (305), a third screw (325), a movable die core (205) and a guide post (215), wherein the movable die plate (225), the movable die bearing plate (235), the die pin (245), the base plate (335) and the movable die base plate (255) are fixedly connected by the second screw (305), two step holes are symmetrically distributed on the left side and the right side of the base plate (335), the movable die core (205) is arranged in the step hole of the base plate (335), the ejector pin plate (265) and the ejector pin fixing plate (275) are arranged in a cavity formed by the movable die bearing plate (235), the die pin (245) and the base plate (335), the ejector pin fixing plate (275) is fixedly connected by, the thimble fixing plate (275) is provided with a stepped hole from bottom to top on the lower plane, the stepped hole is respectively provided with a return rod (315), a push pipe (285) and a pulling rod (295), the return rod (315) slides through the through holes of the movable mold carrier plate (235) and the movable mold plate (225), the upper end surface of the return rod (315) contacts with the lower plane of the fixed mold plate (175) when the upper end surface of the return rod is matched, the return rod (315) is symmetrically provided with four return rods, the four return rods (315) have the same shape and size, after the pulling rod (295) slides through the holes of the movable mold carrier plate (235) and the movable mold plate (225), the Z-shaped reverse buckle at the upper end of the pulling rod (295) is buckled with pouring congeals, after the push pipe (285) slides through the hole of the movable mold carrier plate (235), the front end of the push pipe (285) slides and is inserted into the hole at the lower part of the movable mold plate (225), and after the push pipe (285) is inserted into the hole, the circumferential surface of the upper end of a push pipe (285) is contacted with the circumferential surface of the lower end surface of a product, after the movable mold core (205) slides through holes of an ejector plate (265) and the push pipe (285), the conical part of the upper end of the movable mold core (205) extends into a cavity of a movable mold plate (225), after the conical part of the upper end of the movable mold core (205) extends into the cavity of the movable mold plate (225), a gap formed by the conical part and the cavity of the movable mold plate (225) is a molding position of the lower end of the product, a conical groove h is formed in the center of the upper end surface of the movable mold core (205), when the mold is closed, a conical boss arranged on a fixed mold core (165) of the fixed mold part is inserted into the conical groove h, the lower end surface of the movable mold core (205) is tightly attached to the upper plane of a movable mold base plate (255), four guide post mounting holes are symmetrically distributed on four corners of the movable mold plate (, after the upper part of the guide post (215) passes through the movable mould plate (225), the upper part is inserted into a hole m of the lower plane of the fixed mould plate (175) in a sliding way to form a guide connecting mechanism of the movable mould part and the fixed mould part.