CN111633944B

CN111633944B - Die head structure with adjustable radial wall thickness of molten blank

Info

Publication number: CN111633944B
Application number: CN202010617877.0A
Authority: CN
Inventors: 林一波; 徐文良; 肖志林; 孙晓东
Original assignee: Suzhou Tongda Machinery Co Ltd
Current assignee: Suzhou Tongda Machinery Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2024-07-23
Anticipated expiration: 2040-06-30
Also published as: CN111633944A

Abstract

A die head structure with adjustable radial wall thickness of a molten blank comprises a lower pressing plate, a lower pressing plate and a die head forming part, wherein the lower pressing plate is provided with a die accommodating cavity; the upper pressing disc is overlapped on the lower pressing disc and is provided with an upper pressing disc material guiding cavity; the upper portion of outer bush is visited the entry mould and is held the intracavity and support and extend the below of lower pressure disk in upper portion, lower part of lower pressure disk, and interior bush is located outer bush, and upper portion and dabber cover's lower part cooperation, lower part extend the below of lower pressure disk, constitute the fuse-element between the outer wall of core sleeve and the upper portion inner wall of outer bush and carry the chamber, and the space between the outer wall of interior bush and the lower part inner wall of outer bush constitutes and melts the base runner, characteristics: the inner die deformation-preventing support mechanism is fixed with the bottom of the core shaft sleeve, the inner die deformation-preventing support mechanism is fixed with the outer wall of the lower pressing disc, and the inner die cover is sleeved outside the inner die deformation-preventing support mechanism. Good supporting conditions are provided for the inner die; meets the radial change regulation requirement of the wall thickness of the molten billet.

Description

Die head structure with adjustable radial wall thickness of molten blank

Technical Field

The invention belongs to the technical field of plastic product forming machinery, and particularly relates to a die head structure with an adjustable radial wall thickness of a molten blank.

Background

The aforementioned die structure is an important component of the structural system of a blow molding machine for blowing hollow plastic articles such as various types of cans, galen barrels, palletizing barrels, water tanks, trays for palletizing goods, various pipes such as air pipes for vehicles, and the like. As known in the art, if a preform (i.e., a plastic melt preform or a molten plastic preform, hereinafter referred to as "molten preform") having a varying radial wall thickness at a certain location is to be obtained, it is necessary to adjust the gap between the inner die and the outer die of the structural system of the die mechanism, specifically, to adjust the width of the preform flow path between the inner die and the outer die through which the preform passes according to the process requirements, so that the radial wall thickness of the preform from the flow path outlet (i.e., the preform outlet) between the inner die and the outer die meets the desired hollow plastic product requirements.

Conventional die structures and their utility can be found in, but are not limited to, the following patent documents: CN2837051Y (blow molding machine annular die apparatus), CN102114702B (blow molding machine die structure), CN102152472B (structurally improved plastic blow molding machine die mechanism), CN102145540B (plastic blow molding machine die mechanism), CN202825606U (a blow molding machine die mechanism), CN203305506U (hollow blow molding machine die), CN203472117U (a multipurpose die for blow molding equipment) and CN205185287U (hollow plastic blow molding machine die structure), and the like.

Technical information relating to the wall thickness of the melt strand is likewise known from the published patent literature, such as, for example, "extrusion blow molding die gap electric adjustment device and its implementation method and application" as recommended by CN101960750B, "die gap electric adjustment device of blow molding machine" as provided by CN106827463a, "an extrusion blow molding die gap electric adjustment device" as described in US 585578, etc. A typical "parison radial wall thickness control device of a blow molding machine die mechanism" is disclosed in CN108724673 a. However, since the CN108724673a is directed to an air duct of an automobile having a relatively special shape and an S-shape, the melt is led out from between the outer wall of the mold core and the inner wall of an inner die as an inner die (referred to as "die" in the patent), and the upper outer wall of the die is screwed with the die holder, and the die holder is fixed to the die holder sleeve, the inner die, i.e., the die, is not abnormally elastically deformed. However, for the die head mechanism with the melt flow passage between the outer wall of the taper sleeve-shaped inner die and the inner wall of the outer die, in the actual use process, the inner die tends to be elastically deformed, and the elastic deformation of the inner die can cause abnormal and irregular change of the gap of the melt flow passage, and the product is scrapped when serious; since the adjustment of the radial wall thickness control device is realized by indirect adjustment, the indirect adjustment is realized by changing the position of the die fixing seat sleeve to change the positions of the die fixing seat and the die, thereby realizing the change of the clearance between the inner wall of the die and the outer wall of the die core, the adjustment of the outer die has no enlightenment effect, because the clearance adjustment between the inner die and the outer die can only be realized by the adjustment of the outer die; the patent sets the radial wall thickness control device on the fixed sleeve of the mouth shape, but has no reference meaning for how to set on the cylindric pressure disk. In view of the foregoing, and not by way of limitation, there is a need for reasonable improvement, and the technical solutions described below are created in this context.

Disclosure of Invention

The invention aims to provide a die head structure with adjustable radial wall thickness of a molten billet, which is beneficial to providing good supporting conditions for an inner die to avoid abnormal elastic deformation, is beneficial to directly adjusting an outer die to change a gap of a molten billet flow channel between the inner die and the outer die according to needs, is beneficial to conveniently and reliably arranging a radial wall thickness adjusting mechanism of the molten billet on a lower pressure plate, realizes good connection with the outer die to ensure the adjusting effect of radial width change of the molten billet flow channel between the inner die and the outer die, and is convenient to make stress of the outer die uniform at all adjusting positions to ensure ideal adjusting effect.

The invention is based on the object of providing a die head structure with adjustable radial wall thickness of a melt blank, comprising a lower pressing plate, wherein the lower pressing plate is provided with a die accommodating cavity which penetrates from the upper part to the lower part of the lower pressing plate; an upper platen which is superposed on the lower platen at a position corresponding to the upper part of the lower platen and is fixed with the lower platen, the upper platen is provided with an upper platen material guiding cavity which penetrates from the upper part to the lower part of the upper platen, and the upper platen material guiding cavity corresponds to and is communicated with the die accommodating cavity; the inner die is positioned in the outer die, the upper part of the inner die is matched with the lower part of the core shaft sleeve, the lower part of the inner die is also stretched to the lower part of the lower pressure plate and is flush with the lower part of the outer die, the space between the outer wall of the core shaft sleeve and the upper inner wall of the outer die is formed into a melt-guiding cavity, the space between the outer wall of the inner die and the lower inner wall of the outer die forms a melt-billet runner, and the gap between the lower edge of the inner die and the lower edge of the outer die is formed into a melt-billet outlet, and the inner die is characterized by further comprising an inner die deformation-preventing supporting mechanism and a plurality of melt-billet radial wall thickness adjusting mechanisms with the same interval distance with each other.

In a specific embodiment of the invention, a fixed bracket matching groove which is sunken on the outer wall of the lower pressing plate and has the same number as the radial wall thickness adjusting mechanism of the melting blank is formed at the position corresponding to the connecting shaft abdication hole, an outer die expansion flange edge supporting groove is formed at the periphery of the upper surface of the lower pressing plate and at the position corresponding to the upper part of the outer die, an outer die expansion flange edge is formed on the outer wall of the upper part of the outer die and surrounds the periphery of the outer die, the outer die expansion flange edge is supported on the outer die expansion flange edge supporting groove, and the outer die expansion flange edge is limited by the bottom surface of the upper pressing plate to the upper side surface; an inner die step ring is formed on the upper portion of the inner die and surrounds the periphery of the inner die, a mandrel sleeve step cavity is formed on the lower portion of the mandrel sleeve and surrounds the periphery of the mandrel sleeve, the inner die step ring is matched with the mandrel sleeve step cavity and one side of the inner die step ring facing downwards is sleeved on the inner die deformation prevention supporting mechanism.

In another specific embodiment of the present invention, the inner die deformation-preventing supporting mechanism includes an end cover and a set of inner die adjusting supporting screws, the end cover forms an end cover cavity, an end cover lifting actuating rod hole is formed in the center of the top wall of the end cover cavity, a stack ring is formed at the peripheral edge of the side of the top wall of the end cover cavity facing upwards, a set of inner die adjusting supporting screws are arranged on the end cover around the periphery of the lower part of the end cover at intervals, the outer wall of the inner die protruding out of the end cover by the set of inner die adjusting supporting screws is contacted with the inner wall of the inner die, the inner die step ring cover of the inner die is sleeved on the stack ring, and the peripheral inner wall of the inner die is contacted with the peripheral outer wall of the end cover; the lower part of the core shaft sleeve is fixed with one side of the top wall of the end cover cavity upwards in the stack ring through a core shaft sleeve fixing screw, and the core shaft sleeve cavity of the core shaft sleeve corresponds to and is communicated with the end cover lifting actuating rod hole.

In another specific embodiment of the invention, a mandrel sleeve limiting block is fixed at the central position of one side of the top wall of the end cover cavity, which faces upwards, through a mandrel sleeve limiting block fixing screw, and the outer wall of the mandrel sleeve limiting block is matched with the inner wall of the lower part of the mandrel sleeve cavity of the mandrel sleeve; the end cover is bell-shaped.

In a further specific embodiment of the invention, upper platen set screw holes are arranged on the lower platen and are spaced around the periphery of the lower platen, upper platen set screws are arranged in the upper platen set screw holes, upper platen screw holes are arranged on the upper platen and at positions corresponding to the upper platen set screws, and the upper platen set screws are screwed into the upper platen screw holes; a lower platen heater is provided on the outer wall of the lower platen, and an upper platen heater is provided on the outer wall of the upper platen.

In still another specific embodiment of the present invention, an outer die connecting seat is formed on the outer wall of the lower portion of the outer die and at a position corresponding to the connecting shaft relief hole, the preform radial wall thickness adjusting mechanism fixed to the outer wall of the lower platen in a horizontal cantilever state at a position corresponding to the connecting shaft relief hole and the fixing bracket fitting groove is connected to the outer die connecting seat, and the number of the preform radial wall thickness adjusting mechanisms is two, three or four, which are arranged at equal intervals around the periphery of the lower platen.

In a further specific embodiment of the invention, the inner and outer dies are made of spring steel, which is 50CrVA spring steel.

In a further specific embodiment of the invention, the radial wall thickness adjusting mechanism for a molten metal blank comprises an oil cylinder body, a first end cap I, a second end cap II, a hysteresis displacement sensor, a support shaft plate, a fork member connecting block, a pair of fixing brackets and a connecting shaft, wherein the connecting shaft is horizontally arranged on the lower pressure plate at a position corresponding to the yielding hole of the connecting shaft, one end of the connecting shaft facing the connecting seat of the outer die is connected with the connecting seat of the outer die, one end of the connecting shaft far away from the connecting seat of the outer die is connected with one end of the fork member connecting block facing the lower pressure plate, one end of the pair of fixing brackets corresponding to each other and facing the lower pressure plate is respectively fixed with the lower pressure plate at a position corresponding to the matching groove of the fixing brackets through fixing bracket screws, one end of the pair of fixing brackets far away from the lower pressure plate is formed as a horizontal cantilever end, and a fixing bracket connecting plate is fixed between the upper part and the lower part through the fixing bracket screws, a tip yielding hole is respectively formed at the middle part of the pair of fixing brackets and at a position corresponding to each tip yielding hole, one end of the fork member is formed between the pair of fixing brackets, one end of the fork members is arranged at a position corresponding to each tip yielding hole, one end of the fork member is far away from the outer die connecting seat is connected with one end of the fork member connecting seat facing the lower pressure plate, one end of the fork member is formed by a pair of the fork member is formed into a cavity, and is formed by a fork member and a fork member is formed into a hole, the oil cylinder is characterized in that one end of the tip screw, which faces the fork member, is locked on two sides of the fork member connecting block in the fork member cavity, the support shaft plate is fixed between one ends of the pair of fixing brackets, which face the first end cover I, through the support shaft plate fixing screw, the first end cover I is fixed with the oil cylinder body through the first end cover screw I, an oil cylinder piston is arranged in the oil cylinder body, an oil cylinder first oil cavity I and an oil cylinder second oil cavity II are separated in the oil cylinder body by the oil cylinder piston, the oil cylinder first oil cavity I is communicated with a first oil inlet and return hole I formed on the oil cylinder body, the oil cylinder second oil cavity II is communicated with a second oil inlet and return hole II formed on the oil cylinder body, a piston rod extends from the central position of one side of the oil cylinder piston, which faces the first end cover I, the piston rod is connected with the oil cylinder body through the second end cover fixing screw II, which faces the oil cylinder body back to one side of the first end cover I, the second end cover II is fixed with one side of the oil cylinder body through the second end cover fixing screw, the second end cover II is corresponding to the hysteresis sensor of the first end cover I, the hysteresis sensor is connected with the second end cover II, and the sensor is sequentially displaced from the central sensor head II is positioned at the central sensor II of the position of the oil cylinder.

In a still further specific embodiment of the invention, a wrench operated hexagonal milling plane is formed on the shaft body of the connecting shaft, and a connecting shaft head is formed at one end of the connecting shaft facing the outer die connecting seat, and a connecting shaft head external thread is formed on the outer wall of the connecting shaft head and is connected with an outer die connecting seat internal thread formed on the outer die connecting seat.

In yet another specific embodiment of the present invention, a fork piston rod connecting hole is formed in the fork member and at a position corresponding to the piston rod, a tensioning groove is further formed in one end of the fork member facing the piston rod, the piston rod is inserted into the fork member piston rod connecting hole and is defined by a pair of clamping screws respectively corresponding to two sides of the piston rod, which are arranged on the fork member, and the positions of the clamping screws on the fork member are located at the positions of the tensioning groove; a piston rod sealing ring is arranged at the central position of the first end cover I, and the piston rod is in sealing fit with the piston rod sealing ring.

According to one of the technical effects of the technical scheme provided by the invention, the inner die anti-deformation supporting mechanism is additionally arranged, and the inner die cover is sleeved outside the inner die anti-deformation supporting mechanism, so that good supporting conditions are provided for the inner die, and abnormal elastic deformation is avoided; secondly, the outer die is regulated by a blank melting radial wall thickness regulating mechanism which is arranged outside the lower pressing plate and connected with the outer die, so that the width of a blank melting flow passage between the inner die and the outer die can be changed as required, and the radial change regulating requirement on the blank melting wall thickness is met; thirdly, as the radial wall thickness adjusting mechanism of the molten billet can be conveniently arranged on the lower pressure plate and is connected with the outer die at the position of the yielding hole of the connecting shaft, the radial adjusting effect on the wall thickness of the molten billet passing between the inner die and the outer die can be fully ensured; fourth, because the radial wall thickness regulating mechanism of the molten billet is reasonable in structure, and the radial wall thickness regulating mechanisms of the molten billet are all good in controllability, the stress of the outer die at the regulating part is ensured to be consistent, and the radial wall thickness quality of the molten billet is stable and reliable.

Drawings

FIG. 1 is a block diagram of an embodiment of the present invention.

Fig. 2 is a schematic front side view of fig. 1.

Fig. 3 is a detailed structural view of the preform radial wall thickness adjustment mechanism illustrated in fig. 1 and 2.

Fig. 4 is an external schematic view of the assembled fig. 1.

Detailed Description

In order to make the technical spirit and advantages of the present invention more clearly understood, the applicant will now make a detailed description by way of example, but the description of the examples is not intended to limit the scope of the invention, and any equivalent transformation made merely in form, not essentially, according to the inventive concept should be regarded as the scope of the technical solution of the present invention.

In the following description, all concepts related to the directions or azimuths of up, down, left, right, front and rear are directed to the position state of fig. 1, and thus, the present invention is not to be construed as being limited to the embodiments provided by the present invention.

Referring to fig. 1 and 2, there is shown a lower platen 1, the lower platen 1 having a die receiving chamber 11 penetrating from an upper portion to a lower portion thereof; an upper platen 2 is shown, which is superposed on the lower platen 1 at a position corresponding to the upper side of the lower platen 1 and fixed to the lower platen 1, the upper platen 2 having an upper platen-guiding chamber 21 penetrating from the upper side to the lower side of the upper platen 2, the upper platen-guiding chamber 21 corresponding to and communicating with the die receiving chamber 11, and being an inverted circular-table chamber, i.e., a horn-shaped chamber, due to the upper-platen-guiding chamber 21 having a large upper-lower diameter; an inner die 3, an outer die 4 and a core sleeve 5 are shown, the upper part of the outer die 4 is inserted into the die accommodating chamber 11 and supported on the upper part of the lower platen 1, the lower part of the outer die 4 is extended below the lower platen 1, the inner die 3 is positioned in the outer die 4, the upper part of the inner die 3 is matched with the lower part of the core sleeve 5, the lower part of the inner die 3 is extended below the lower platen 1 and is flush with the lower part, i.e., the lower edge, of the outer die 4, the space between the outer wall of the core sleeve 5 and the upper inner wall of the outer die 4 is formed as a melt-feeding chamber 9a, the space between the outer wall of the inner die 3 and the lower inner wall of the outer die 4 is formed as a melt-billet runner 9b, and the gap between the lower edge of the inner die 3 and the lower edge of the outer die 4 is formed as a melt-billet-extracting port 9c.

The technical key points of the technical scheme provided by the invention are as follows: the die head structure system with adjustable radial wall thickness of the molten blank further comprises an inner die deformation preventing supporting mechanism 6 and a plurality of molten blank radial wall thickness adjusting mechanisms 7 with the same interval distance, wherein the inner die deformation preventing supporting mechanism 6 is fixed with the bottom of the core shaft sleeve 5, the molten blank radial wall thickness adjusting mechanisms 7 are fixed with the outer wall of the lower pressure plate 1 in a horizontal suspension wall state, and extend to the lower part of the outer die 4 in the die accommodating cavity 11 at the position corresponding to a connecting shaft abdicating hole 12 which is arranged on the lower pressure plate 1 and communicated with the die accommodating cavity 11, and the inner die 3 is sleeved outside the inner die deformation preventing supporting mechanism 6.

In the present embodiment, the applicant exemplifies a case where the number of the preform radial wall thickness adjustment mechanisms 7 is two, the two preform radial wall thickness adjustment mechanisms 7 being disposed in a face-to-face positional relationship around the periphery of the aforementioned lower platen 1 at 180 ° intervals, and if three or four preform radial wall thickness adjustment mechanisms 7 are employed, they are disposed at 120 ° or 90 ° intervals, respectively, in the circumferential direction of the lower platen 1. From the foregoing, it is clear that the present invention cannot be limited by the number change of the preform radial wall thickness adjustment mechanism 7.

With continued reference to fig. 1 and 2, on the outer wall of the lower platen 1 and in a position corresponding to the connecting shaft relief hole 12, there are formed in a paired manner, i.e., in two, fixing bracket fitting grooves 13 recessed in the outer wall surface of the lower platen 1 in the same number as, i.e., equal to, the above-mentioned preform radial wall thickness adjusting mechanism 7, specifically, two fixing bracket fitting grooves 13 are formed corresponding to one preform radial wall thickness adjusting mechanism 7, an outer die expansion flange side supporting groove 14 is formed around the upper surface of the lower platen 1 and in a position corresponding to the upper portion of the above-mentioned outer die 4, an outer die expansion flange side 41 is formed around the upper outer wall of the outer die 4, the outer die expansion flange side 41 is supported on the outer die expansion flange side supporting groove 14, and one side surface of the outer die expansion flange side 41 facing upward is defined by the bottom surface (bottom surface) of the above-mentioned upper platen 2; an inner die step ring 31 is formed around the inner die 3 at the upper part of the inner die 3, and a mandrel sleeve step cavity 51 is formed around the core sleeve 5 at the lower part of the core sleeve 5, and the inner die step ring 31 is matched with the mandrel sleeve step cavity 51, and the side of the inner die step ring 31 facing downwards is also covered on the inner die deformation preventing support mechanism 6.

Still referring to fig. 1 and 2, the inner die deformation preventing support mechanism 6 includes an end cap 61 and a set of inner die adjusting support screws 62, the end cap 61 is formed with an end cap cavity 611, an end cap lifting actuating rod hole 61111 is formed at the central position of an end cap cavity top wall 6111 of the end cap cavity 611, a stack ring 61112 is formed at the peripheral edge part of one side of the end cap cavity top wall 6111 facing upwards, the set of inner die adjusting support screws 62 are arranged on the end cap 61 at intervals around the periphery of the lower part of the end cap 61, and the set of inner die adjusting support screws 62 protrude out of the outer wall of the end cap 61 and contact with the inner wall of the inner die 3, a fixing nut 621 is arranged at one end of each of the inner die adjusting support screws 62 facing the end cap cavity 611, after the inner die adjusting support screws 62 are adjusted, the inner die step ring 31 of the inner die 3 is sleeved on the stack ring 61112 immediately, and the periphery of the inner die 3 contacts with the periphery of the end cap 61; the lower part of the core sleeve 5 is fixed to the side of the top wall 6111 of the end cover cavity facing upwards in the stack ring 61112 through the core sleeve fixing screw 52 and the position corresponding to the core sleeve fixing screw hole 521 arranged at the bottom of the core sleeve fixing screw, and the core sleeve cavity 53 of the core sleeve 5 corresponds to and is communicated with the end cover lifting actuating rod hole 61111.

In the blow molding process, specifically, there is a relationship in the blow ratio between the preform, i.e., the melt and the product when the product is molded, and in the case of a round barrel product, the blow ratio at the same cross section of the round barrel and the round preform is theoretically uniform, and the gap between the melt flow path 9b of the inner die 3 and the outer die 4 is uniform. However, when the blow-up ratio is not uniform, for example, when the container is a square barrel, the clearance between the inner die 3 and the outer die 4 in the melt-base flow path 9b is adjusted, and in this case, the clearance between the inner die and the outer die is adjusted by the inner die adjusting support screw 62 to ensure the clearance relation in the same section, and the corresponding inner die adjusting support screw 62 is locked by the fixing nut 621 after the adjustment is completed.

A mandrel sleeve limiting block 63 is fixed at the central position of one side of the upper wall 6111 of the end cover cavity, which faces upwards, through a mandrel sleeve limiting block fixing screw 631, and the outer wall of the mandrel sleeve limiting block 63 is matched with the inner wall of the lower part of the mandrel sleeve cavity 53 of the mandrel sleeve 5; the end cap 61 has a bell shape. Also shown in fig. 1 and 2 is a mandrel sleeve stopper hole 632 centered on the mandrel sleeve stopper 63, the mandrel sleeve stopper hole 632 corresponding to and having the same diameter as the end cap lift actuator rod hole 61111 described above.

An upper platen set screw hole 15 is provided on the lower platen 1 at intervals around the periphery of the lower platen 1, an upper platen set screw 151 is provided in the upper platen set screw hole 15, an upper platen screw hole 22 is provided on the upper platen 2 at a position corresponding to the upper platen set screw 151, and the upper platen set screw 151 is screwed into the upper platen screw hole 22; a lower platen heater 16 is provided on the outer wall of the lower platen 1, and an upper platen heater 23 is provided on the outer wall of the upper platen 2.

Still referring to fig. 1 and 2, an outer die connecting seat 42 is formed on the outer wall of the lower portion of the outer die 4 at a position corresponding to the connecting shaft relief hole 12, the preform radial wall thickness adjusting mechanism 7 fixed to the outer wall of the lower platen 1 in a horizontally cantilevered state at a position corresponding to the connecting shaft relief hole 12 and the fixing bracket fitting groove 13 is connected to the outer die connecting seat 42, and the number of the preform radial wall thickness adjusting mechanisms 7 is two which are disposed at equal intervals around the periphery of the lower platen 1, namely, 180 ° apart and are formed in a face-to-face positional relationship.

In this embodiment, the inner die 3 and the outer die 4 are made of spring steel, which is 50CrVA spring steel.

According to the common general knowledge, the end cover 61 is lifted up and reset down by an end cover lifting actuating rod which is connected with the top wall 6111 of the end cover cavity from top to bottom through the core sleeve cavity 53, the core sleeve limiting block hole 632 and the end cover lifting actuating rod hole 61111, which are not shown in the figure. Since the inner die 3 is fitted over the end cap 61, the above-described preform outlet 9c is closed when the end cap 61 is lifted up by the end cap actuating lever, and vice versa. Before the melt-out port 9c is closed, a melt is cut by a melt-cutting mechanism and introduced into a mold of a structural system of a blow molding machine, and blow-molded by a blow pin of a blow molding mechanism.

Referring to fig. 3 and 4 in combination with fig. 1 to 2, the aforementioned melt-blank radial wall thickness adjusting mechanism 7 includes an oil cylinder 71, a first end cap i 72, a second end cap ii 73, a hysteresis displacement sensor 74, a support shaft plate 75, a fork 76, a fork connecting block 77, a pair of fixing brackets 78, and a connecting shaft 79, the connecting shaft 79 being provided on the aforementioned lower platen 1 so as to be horizontally movable at a position corresponding to the aforementioned connecting shaft relief hole 12 and one end of the connecting shaft 79 facing the aforementioned outer die connecting seat 42 being connected to the outer die connecting seat 42, and one end of the connecting shaft 79 facing away from the outer die connecting seat 42 being connected to one end of the fork connecting block 77 facing the aforementioned lower platen 1, a pair of fixing brackets 78 are corresponded to each other and one ends of the pair of fixing brackets 78 facing the lower platen 1 are each fixed to the lower platen 1 by fixing bracket screws 781 at positions corresponding to the aforementioned fixing bracket fitting grooves 13 (a pair), while one ends of the pair of fixing brackets 78 remote from the lower platen 1 are constituted as horizontal cantilever ends and are each fixed with a fixing bracket connecting plate 782 between upper and lower portions by fixing bracket connecting plate screws 7821, a tip screw adjustment relief hole 783 is provided at the middle portion of the pair of fixing brackets 78 and at positions corresponding to each other, a space between the pair of fixing brackets 78 is constituted as a fork receiving chamber 784, The fork 76 is disposed in the fork receiving chamber 784, a tip screw seat 7611 is formed on the outer walls of a pair of fork arms 761 of the fork 76 and at positions corresponding to each other, a tip screw 76111 is screwed on the tip screw seat 7611, the tip screw 76111 is inserted into the tip screw adjustment relief hole 783 toward one end of the pair of fixing brackets 78, the tip screw 76111 is inserted into the fork chamber 762 of the fork 76 toward one end of the fork 76, the fork connecting block 77 is extended into the fork chamber 762 toward one end of the fork 76, The tip screw 76111 is locked toward one end of the fork 76 to both sides of the fork connection block 77 in the fork chamber 762, the support shaft plate 75 is fixed between one ends of the pair of fixing brackets 78 toward the first end cap i 72 by the support shaft plate fixing screw 751, and the first end cap i 72 is fixed to the cylinder block 71 by the first end cap screw i 721 at a position between the support shaft plate 75 and the cylinder block 71, a cylinder piston 711 is provided in the cylinder block 71, a cylinder block first oil chamber i 7111 and a cylinder block second oil chamber ii 7112 are separated by the cylinder piston 711 in the cylinder block 71, The first oil chamber I7111 of the oil cylinder body is communicated with a first oil inlet and return hole I712 formed on the oil cylinder body 71, the second oil chamber II 7112 of the oil cylinder body is communicated with a second oil inlet and return hole II 713 formed on the oil cylinder body 71, a piston rod 7113 is extended at the center position of one side of the oil cylinder piston 711 toward the first end cap I72, the piston rod 7113 is connected with the fork 76 after passing through the first end cap I72 and the supporting shaft plate 75 in turn, the second end cap II 73 is fixed with one side of the oil cylinder body 71 opposite to the first end cap I72 through a second end cap fixing screw II 731, and the position of the second end cap II 73 corresponds to the position of the first end cap I72, The hysteresis displacement sensor 74 is fixed to the center of the second end cap ii 73 in a horizontal position, and the sensor head 741 of the hysteresis displacement sensor 74 is connected to the cylinder piston 711 after passing through the sensor head relief hole 732 in the center of the second end cap ii 73 and the cylinder second oil chamber ii 7112 in this order.

As shown in fig. 2 and 3, a wrench-operated hexagonal milling plane 791 is formed on the shaft body of the connection shaft 79, a connection shaft head 792 is formed at one end of the connection shaft 79 facing the outer die connection seat 42, a connection shaft head external thread 7921 is formed on the outer wall of the connection shaft head 792, and the connection shaft head external thread 7921 is connected with an outer die connection seat internal thread formed on the outer die connection seat 42.

Preferably, a fork piston rod connection hole 763 is formed in the fork 76 and at a position corresponding to the piston rod 7113, a tensioning slot 764 is formed in one end of the fork 76 facing the piston rod 7113, the piston rod 7113 is inserted into the fork piston rod connection hole 763 and is limited by a pair of clamping screws 765 which are respectively corresponding to two sides of the piston rod 7113 and are arranged on the fork 76, and the positions of the pair of clamping screws 765 on the fork 76 are positioned at the positions of the tensioning slot 764; a piston rod sealing ring 722 is disposed at the center of the first end cap i 72, and the piston rod 7113 is in sealing engagement with the piston rod sealing ring 722.

Because of the structural relationship of the mold, the blow-up of the molded product such as the mouth and bottom of the can is required, the blow-up ratio in the mold closing line direction is small, the blow-up ratio of the cavity is large, and the micro adjustment by the inner die adjusting support screw 62 corresponding to the position of the can is insufficient, that is, the adjustment by the inner die adjusting support screw 62 alone is insufficient, and thus, the adjustment by the preform radial wall thickness adjusting mechanism 7 is required.

The applicant describes the working process of the radial wall thickness adjusting mechanism of the molten metal blank with reference to fig. 1 to 4, when the gap between the part or area corresponding to the outer die connecting seat 42 of the outer die 4 is to be increased, the first oil inlet and return hole i 712 is used for oil feeding, the oil liquid entering the first oil cavity i 7111 of the oil cylinder body displaces the oil cylinder piston 7113 towards the second oil cavity ii 7112 of the oil cylinder body, the piston rod 7113 drives the fork 76 to correspondingly displace, i.e. to co-displace, the fork 76 drives the connecting block 77 to correspondingly displace, i.e. to co-displace, by the pair of tip screws 76111, the connecting block 77 drives the connecting shaft 79 to correspondingly displace, thereby the connecting shaft head 792 of the connecting shaft 79 drives the outer die connecting seat 42, and the outer die 4 is driven by the outer die connecting seat 42 to displace in the direction away from the inner die 3, the width of the part (the part or area corresponding to the outer die connecting seat 42 of the outer die 4) of the molten metal blank is widened, and vice versa. In the foregoing process, when the cylinder piston 711 is displaced in the direction of the cylinder second oil chamber ii 7112, the second oil intake and return hole ii 713 returns oil, and at the same time, the sensor head 741 of the hysteresis displacement sensor 74 collects a signal and the hysteresis sensor 74 feeds back the signal to the electric controller of the blow molding machine, and when the outer die 4 reaches the displacement amount, that is, the melt-blank flow passage 9b reaches the set width, the first oil intake and return hole i 712 of the cylinder 71 stops the oil intake. The advantage of this form of construction of the invention is that: the system control is carried out on the mandrel modification from the original, so that secondary processing is reduced, and the accuracy of radial wall thickness is improved; in the prior art, under different states of the same die head, the requirement can be met by carrying out different shaping on the core mold, but the invention can directly regulate the wall thickness of the molten billet through a plurality of molten billet radial wall thickness regulating mechanisms 7, thereby reducing the complex work of workers, and directly regulating the wall thickness of the molten billet according to the technological requirement through system control modification, namely directly regulating the wall thickness of the molten billet by the molten billet radial wall thickness regulating mechanisms 7.

In summary, the technical scheme provided by the invention overcomes the defects in the prior art, successfully completes the task of the invention, and faithfully honors the technical effects carried by the applicant in the technical effect column above.

Claims

1. The die head structure with adjustable radial wall thickness of the melt blank comprises a lower pressing disc (1), wherein the lower pressing disc (1) is provided with a die accommodating cavity (11) penetrating from the upper part to the lower part of the lower pressing disc; an upper platen (2) which is superposed on the lower platen (1) at a position corresponding to the upper side of the lower platen (1) and is fixed to the lower platen (1), the upper platen (2) having an upper platen-guiding chamber (21) penetrating from the upper side to the lower side of the upper platen (2), the upper platen-guiding chamber (21) corresponding to and communicating with the die-receiving chamber (11); An inner die (3), an outer die (4) and a core sleeve (5), the upper part of the outer die (4) is inserted into the die accommodating cavity (11) and supported on the upper part of the lower pressing plate (1), the lower part of the outer die (4) extends below the lower pressing plate (1), the inner die (3) is positioned in the outer die (4), the upper part of the inner die (3) is matched with the lower part of the core sleeve (5), the lower part of the inner die (3) also extends below the lower pressing plate (1) and is level with the lower part of the outer die (4), the space between the outer wall of the core sleeve (5) and the upper inner wall of the outer die (4) is formed into a melt guiding cavity (9 a), The space between the outer wall of the inner die (3) and the lower inner wall of the outer die (4) forms a blank melting runner (9 b), and a gap between the lower edge of the inner die (3) and the lower edge of the outer die (4) forms a blank melting outlet (9 c), characterized by further comprising an inner die deformation-preventing supporting mechanism (6) and a plurality of blank melting radial wall thickness adjusting mechanisms (7) with the same interval distance, wherein the inner die deformation-preventing supporting mechanism (6) is fixed with the bottom of the mandrel sleeve (5), the blank melting radial wall thickness adjusting mechanism (7) is fixed with the outer wall of the lower pressure plate (1) in a horizontal suspension state and extends into the die accommodating cavity (11) to be connected with the lower part of the outer die (4) at a position corresponding to a connecting shaft abdicating hole (12) which is arranged on the lower pressure plate (1) and communicated with the die accommodating cavity (11), the inner die (3) is sleeved outside the inner die deformation-preventing supporting mechanism (6); A fixed bracket matching groove (13) which is recessed on the outer wall of the lower pressing plate (1) and has the same number as that of the fused blank radial wall thickness adjusting mechanism (7) is formed on the outer wall of the lower pressing plate (1) at the position corresponding to the connecting shaft yielding hole (12), an outer die expansion flange edge supporting groove (14) is formed on the periphery of the upper surface of the lower pressing plate (1) and at the position corresponding to the upper part of the outer die (4), an outer die expansion flange edge (41) is formed on the outer wall of the upper part of the outer die (4) and surrounds the periphery of the outer die (4), the outer die expansion flange edge (41) is supported on the outer die expansion flange edge supporting groove (14), And the bottom surface of the upper pressure plate (2) limits one side surface of the outer die expansion flange edge (41) facing upwards; An inner die step ring (31) is formed at the upper part of the inner die (3) and surrounds the periphery of the inner die (3), a mandrel sleeve step cavity (51) is formed at the lower part of the mandrel sleeve (5) and surrounds the periphery of the mandrel sleeve (5), the inner die step ring (31) is matched with the mandrel sleeve step cavity (51) and the inner die step ring (31) is sleeved on the inner die deformation prevention supporting mechanism (6) at one side facing downwards; an outer die connecting seat (42) is formed on the outer wall of the lower part of the outer die (4) and at the position corresponding to the connecting shaft abdication hole (12), the melt blank radial wall thickness adjusting mechanism (7) fixed with the outer wall of the lower pressure plate (1) in a horizontal cantilever state at the position corresponding to the connecting shaft abdication hole (12) and the fixed bracket matching groove (13) is connected with the outer die connecting seat (42), and the number of the melt blank radial wall thickness adjusting mechanisms (7) is two, three or four which are arranged at equal intervals around the periphery of the lower pressure plate (1); The melt blank radial wall thickness adjusting mechanism (7) comprises an oil cylinder body (71), a first end cover I (72), a second end cover II (73), a hysteresis displacement sensor (74), a supporting shaft plate (75), a fork-shaped member (76), a fork-shaped member connecting block (77), a pair of fixed brackets (78) and a connecting shaft (79), wherein the connecting shaft (79) is horizontally arranged on the lower pressure plate (1) at a position corresponding to the connecting shaft abdicating hole (12) in a moving way, one end of the connecting shaft (79) facing the outer die connecting seat (42) is connected with the outer die connecting seat (42), one end of the connecting shaft (79) far away from the outer die connecting seat (42) is connected with one end of the fork-shaped member connecting block (77) facing the lower pressure plate (1), one end of the pair of fixing brackets (78) facing the lower pressure plate (1) is respectively fixed with the lower pressure plate (1) through fixing bracket screws (781) at positions corresponding to the fixing bracket matching grooves (13), one end of the pair of fixing brackets (78) far away from the lower pressure plate (1) is formed into a horizontal cantilever end, a fixing bracket connecting plate (782) is respectively fixed between the upper part and the lower part through fixing bracket connecting plate screws (7821), a center screw adjusting yielding hole (783) is respectively formed at the middle part of the pair of fixing brackets (78) and at the positions corresponding to each other, The space between the pair of fixing brackets (78) is formed as a fork accommodating cavity (784), the fork (76) is arranged in the fork accommodating cavity (784), a tip screw seat (7611) is respectively formed on the outer walls of the pair of fork arms (761) of the fork (76) and at mutually corresponding positions, a tip screw (76111) is screwed on the tip screw seat (7611), the tip screw (76111) is inserted into the tip screw adjusting yielding hole (783) towards one end of the pair of fixing brackets (78), the tip screw (76111) is inserted into the fork cavity (762) of the fork (76) towards one end of the fork (76), the fork connection block (77) extends into the fork cavity (762) toward one end of the fork (76), the tip screw (76111) locks both sides of the fork connection block (77) in the fork cavity (762) toward one end of the fork (76), the support shaft plate (75) is fixed between one ends of the pair of fixing brackets (78) toward the first end cap I (72) through the support shaft plate fixing screw (751), and the first end cap I (72) is fixed with the oil cylinder body (71) through the first end cap screw I (721) at a position between the support shaft plate (75) and the oil cylinder body (71), An oil cylinder piston (711) is arranged in the oil cylinder body (71), a first oil cavity I (7111) of the oil cylinder body and a second oil cavity II (7112) of the oil cylinder body are separated in the oil cylinder body (71) by the oil cylinder piston (711), the first oil cavity I (7111) of the oil cylinder body is communicated with a first oil inlet and return hole I (712) formed on the oil cylinder body (71), the second oil cavity II (7112) of the oil cylinder body is communicated with a second oil inlet and return hole II (713) formed on the oil cylinder body (71), a piston rod (7113) extends at the central position of one side of the oil cylinder piston (711) facing the first end cover I (72), The piston rod (7113) is connected with the fork-shaped member (76) after sequentially passing through the first end cover I (72) and the supporting shaft plate (75), the second end cover II (73) is fixed with one side of the oil cylinder body (71) opposite to the first end cover I (72) through the second end cover fixing screw II (731), the position of the second end cover II (73) corresponds to the position of the first end cover I (72), the hysteresis displacement sensor (74) is fixed with the central position of the second end cover II (73) in a horizontal state, and the sensor head (741) of the hysteresis displacement sensor (74) is connected with the oil cylinder piston (711) after sequentially passing through the sensor head abdicating hole (732) in the central position of the second end cover II (73) and the second oil cavity II (7112) of the oil cylinder body.

2. The die head structure with adjustable radial wall thickness of the molten blank according to claim 1, characterized in that the inner die deformation-preventing supporting mechanism (6) comprises an end cover (61) and a group of inner die adjustment supporting screws (62), the end cover (61) is provided with an end cover cavity (611), an end cover lifting actuating rod hole (61111) is formed in the center position of an end cover cavity top wall (6111) of the end cover cavity (611), a stack ring (61112) is formed at the peripheral edge part of one side of the end cover cavity top wall (6111) facing upwards, a group of inner die adjustment supporting screws (62) are arranged on the end cover (61) at intervals around the periphery of the lower part of the end cover (61), the outer wall of the group of inner die adjustment supporting screws (62) protruding out of the end cover (61) is contacted with the inner wall of the inner die (3), the inner die step ring (31) of the inner die (3) is sleeved on the stack ring (61112), and the periphery of the inner die (3) is contacted with the outer wall of the end cover (61); the lower part of the mandrel sleeve (5) is fixed with one side of the top wall (6111) of the end cover cavity upwards in the stack ring (61112) through a mandrel sleeve fixing screw (52), and a mandrel sleeve cavity (53) of the mandrel sleeve (5) corresponds to and is communicated with the end cover lifting actuating rod hole (61111).

3. The die head structure with adjustable radial wall thickness of the molten billet according to claim 2, characterized in that a mandrel sleeve limiting block (63) is fixed at the central position of one side of the top wall (6111) of the end cover cavity, which faces upwards, through a mandrel sleeve limiting block fixing screw (631), and the outer wall of the mandrel sleeve limiting block (63) is matched with the inner wall of the lower part of the mandrel sleeve cavity (53) of the mandrel sleeve (5); the end cap (61) is bell-shaped.

4. The die head structure with adjustable radial wall thickness of the molten blank according to claim 1, characterized in that upper platen fixing screw holes (15) are arranged on the lower platen (1) and are spaced around the lower platen (1), upper platen fixing screws (151) are arranged in the upper platen fixing screw holes (15), upper platen screw holes (22) are arranged on the upper platen (2) and at positions corresponding to the upper platen fixing screws (151), and the upper platen fixing screws (151) are screwed into the upper platen screw holes (22); a lower platen heater (16) is provided on the outer wall of the lower platen (1), and an upper platen heater (23) is provided on the outer wall of the upper platen (2).

5. The die structure with adjustable radial wall thickness of the molten billet according to claim 1, characterized in that the inner die (3) and the outer die (4) are made of spring steel, which is 50CrVA spring steel.

6. The die head structure with adjustable radial wall thickness of the molten billet according to claim 1, characterized in that a wrench operated hexagonal milling plane (791) is formed on the shaft body of the connecting shaft (79), and one end of the connecting shaft (79) facing the outer die connecting seat (42) is formed with a connecting shaft head (792), a connecting shaft head external thread (7921) is formed on the outer wall of the connecting shaft head (792), and the connecting shaft head external thread (7921) is connected with an inner thread of the outer die connecting seat formed on the outer die connecting seat (42).

7. The die head structure with adjustable radial wall thickness of the melt blank according to claim 1, characterized in that a fork member piston rod connecting hole (763) is formed in the fork member (76) and at a position corresponding to the piston rod (7113), a tensioning groove (764) is formed in one end of the fork member (76) facing the piston rod (7113), the piston rod (7113) is inserted into the fork member piston rod connecting hole (763) and is limited by a pair of clamping screws (765) which are arranged on the fork member (76) and respectively correspond to two sides of the piston rod (7113), and the positions of the pair of clamping screws (765) on the fork member (76) are located at the positions of the tensioning groove (764); a piston rod sealing ring (722) is arranged at the central position of the first end cover I (72), and the piston rod (7113) is in sealing fit with the piston rod sealing ring (722).