CN210453726U - Thermal forming die with novel cooling structure - Google Patents

Abstract

A thermal forming die with a novel cooling structure comprises an upper die and a lower die; the upper die comprises an upper die plate and an upper shearing die plate, a plurality of upper shearing dies are arranged on the upper shearing die plate, and each upper shearing die is provided with a cavity; the lower mould includes lower bolster, lower mould body, lower shear mold board and a plurality of moulded die, is equipped with a plurality of shear mold down, characterized by on the shear mold board down: the lower die body is provided with a cooling connecting channel, and each forming die is provided with a forming die internal cooling channel; the cooling channel in the forming die is provided with a water inlet end and a water outlet end, and the water inlet end and the water outlet end of the cooling channel in the forming die are respectively communicated with the cooling connecting channel; the cooling medium in the cooling connecting channel enters the in-forming die cooling channel through the in-forming die cooling channel water inlet end, flows through the in-forming die cooling channel and then flows back to the cooling connecting channel through the in-forming die cooling channel water outlet end. The utility model discloses a thermoforming mould can realize the quick cooling of moulded die, is favorable to improving production speed and plastic products quality.

Description

Thermal forming die with novel cooling structure

Technical Field

The utility model relates to a thermoforming equipment, specifically speaking relates to a thermoforming mould with novel cooling structure.

Background

The existing thermal forming die for manufacturing plastic containers (such as plastic cups, plastic boxes, plastic basins and the like) can complete forming and shearing actions. The hot forming die comprises an upper die and a lower die; the upper die comprises an upper die plate, an upper shear die mounting plate and a plurality of upper shear dies, the upper shear die mounting plate is mounted on the upper die plate, a plurality of upper shear die containing cavities are formed in the upper shear die mounting plate, the number of the upper shear dies is the same as that of the upper shear die containing cavities, the upper shear dies correspond to the upper shear die containing cavities one by one, the upper shear dies are arranged in the upper shear die containing cavities, and each upper shear die is provided with a cavity; the lower die comprises a lower die plate, a lower die body, a lower shear die mounting plate, an ejector rod mounting plate, a plurality of lower shear dies, a plurality of forming dies and a plurality of ejector rods, wherein the lower die body is mounted on the lower die plate and is positioned above the lower die plate, the lower shear die mounting plate is mounted on the lower die body and is positioned above the lower die body, the number of the lower shear dies is the same as that of the upper shear dies and is in one-to-one correspondence with the upper shear dies (generally, the inner edge of the lower end of the upper shear die is an upper shear blade, the outer edge of the upper end of the lower shear die is a lower shear blade, and the lower shear blade is matched with the upper shear blade), the lower shear die mounting plate is provided with a plurality of lower shear die accommodating cavities, the number of the lower shear dies is the same as that of the lower shear dies and is in one-to-one correspondence with the forming dies, the lower shear dies are arranged in the lower shear die accommodating cavities, each forming die comprises, the movable bottom die is connected with the upper end of the corresponding ejector rod, the ejector rod mounting plate is arranged below the lower die plate, and the lower end of each ejector rod extends to the lower portion of the lower die plate and is connected with the ejector rod mounting plate.

The upper die usually further comprises a plurality of pressing rings, the number of the pressing rings is the same as that of the upper shearing die, the pressing rings correspond to the upper shearing die one by one, the pressing rings are arranged in a cavity of the upper shearing die and can move up and down in the cavity of the upper shearing die, and the pressing rings press the sheet material onto the lower die during die assembly. The upper die usually further comprises a plurality of stretching heads, a plurality of stretching rods, a stretching rod mounting plate and a stretching rod mounting plate lifting control mechanism, the number of the stretching heads is the same as that of the upper shear dies, the stretching heads are in one-to-one correspondence with the upper shear dies, the number of the stretching rods is the same as that of the stretching heads, the stretching heads are arranged in cavities of the upper shear dies, the lower ends of the stretching rods are connected with the stretching heads, the upper ends of the stretching rods are connected with the stretching rod mounting plate, and the stretching rod mounting plate is connected with the stretching. And under the condition that the material pressing ring is arranged in the cavity of the upper shearing die, the stretching head is positioned in the cavity of the material pressing ring.

In the thermoforming mold, the forming mold, the lower shear mold, the ejector rod, the upper shear mold, the material pressing ring and the stretching head form a forming unit, and one forming unit can form a plastic container. The side die is used for forming the side wall and the edge part of the plastic container; the movable bottom die is used for forming the bottom of the plastic container. Generally, a plurality of molding units in a thermoforming mold are arranged in a plurality of rows and columns.

When the plastic container is manufactured, firstly, the plastic sheet is heated to enable the plastic sheet to reach the molding temperature; the heated plastic sheet passes through a forming area, at the moment, a thermoforming mold is closed, and under the drive of a stretching rod, each stretching head moves downwards in a cavity of an upper shearing mold to pre-stretch the plastic sheet, so that the shape and the size of the plastic sheet are close to those of a product; then, the plastic sheet is tightly attached to the forming die through positive pressure thermoforming (or negative pressure thermoforming); the formed sheet material is sheared by an upper shearing blade of an upper shearing die and a lower shearing blade of a lower shearing die, and the plastic container is sheared from the formed sheet material to obtain a single plastic container; then the ejector rod mounting plate drives each ejector rod and each movable bottom die to ascend relative to the lower die plate, and the plastic container is ejected out of the forming die, so that the plastic container is separated from the forming die; air is then blown into the plastic container to blow the plastic container away from the thermoforming mold.

In order to shorten the molding cycle, the thermoforming mold is usually further provided with a cooling water path to cool the molding mold so as to accelerate the cooling and shaping of the plastic container. At present, the cooling water route sets up in the shear die outside down usually, and the cooling water route lets in the cooling water and cools off shear die down, and the moulded die then transmits its heat for shear die down and realize the cooling through heat-conduction, and this kind of mode cooling rate is slower, is unfavorable for timely, the abundant cooling of moulded die, can influence the quality of plastic container, and is unfavorable for the improvement of production speed.

Disclosure of Invention

The utility model aims to solve the technical problem that a thermoforming mould with novel cooling structure is provided, this kind of thermoforming mould can realize the quick cooling of moulded die, is favorable to improving production speed and plastic products quality. The technical scheme is as follows:

a thermal forming die with a novel cooling structure comprises an upper die and a lower die; the upper die comprises an upper die plate and an upper shearing die plate, the upper shearing die plate is arranged on the upper die plate and is positioned below the upper die plate, a plurality of upper shearing dies are arranged on the upper shearing die plate, and each upper shearing die is provided with a cavity; the lower mould includes the lower bolster, the lower mould body, lower shear template and a plurality of moulded die, the lower mould body is installed on the lower bolster and is located in the lower bolster top, lower shear template is installed on the lower mould body and is in lower mould body top, be equipped with a plurality of shear modes down on the shear template down, lower shear mode is the same with last shear mode quantity and one-to-one, the moulded die is the same with lower shear mode quantity and one-to-one, the moulded die is installed on the lower mould body and is in the inboard of the lower shear mode of correspondence, characterized by: the lower die body is provided with a cooling connecting channel, and each forming die is provided with a forming die internal cooling channel; the cooling channel in the forming die is provided with a water inlet end and a water outlet end, and the water inlet end and the water outlet end of the cooling channel in the forming die are respectively communicated with the cooling connecting channel; the cooling medium in the cooling connecting channel enters the in-forming die cooling channel through the in-forming die cooling channel water inlet end, flows through the in-forming die cooling channel and then flows back to the cooling connecting channel through the in-forming die cooling channel water outlet end.

The thermoforming mould is provided with in-mould cooling channels in each forming mould, cooling medium (such as cooling water) is conveyed to the in-mould cooling channels through the cooling connecting channel arranged in the lower mould body, the cooling medium takes away heat on the forming mould when flowing through the in-mould cooling channels, and cools the forming mould and the plastic sheet tightly attached to the forming mould, so that the cooling efficiency is high, the production efficiency is improved, and the quality of plastic products is improved.

The cooling connecting channel has at least one water inlet and at least one water outlet. Typically, the water inlet and outlet are provided in pairs. In the case of a plurality of water inlets, the water inlets can be combined by a pipeline to a water inlet pipe connection, from which the cooling medium is supplied and distributed to the water inlets. Under the condition that a plurality of water outlets are arranged, all the water outlets can be gathered to a water outlet pipe joint through pipelines, and cooling media flowing out of all the water outlets are gathered to the water outlet pipe joint and then discharged. The cooling medium enters the cooling connecting channel from the water inlet pipe joint and each water inlet, flows through the cooling channel in each forming die, and flows out of the thermal forming die from each water outlet and the water outlet pipe joint after cooling each forming die.

In a specific embodiment, the cooling connection channel has a water inlet and a water outlet, and the water inlet and the water outlet are respectively disposed at two ends of the cooling connection channel. A water inlet pipe joint can be arranged at the water inlet, and a water outlet pipe joint can be arranged at the water outlet. Under the condition, cooling channels in the forming dies of all the forming dies are connected in series through cooling connecting channels to form a required cooling water path; the cooling medium enters the cooling connecting channel from the water inlet pipe joint and the water inlet, sequentially flows through the cooling channels in the forming dies, and flows out from the water outlet and the water outlet pipe joint after cooling the forming dies.

In a preferred scheme, a plurality of pairs of water supply outlets and water return inlets are arranged on the cooling connecting channel, and one pair of water supply outlets and water return inlets correspond to one cooling channel in the forming die; and in the same pair of water supply outlet and water return inlet, the water supply outlet is communicated with the water inlet end of the corresponding cooling channel in the forming die, the water return inlet is communicated with the water outlet end of the corresponding cooling channel in the forming die, and a middle plug is arranged in the part of the cooling connecting channel between the same pair of water supply outlet and water return inlet. The middle plugs in the parts between the water supply outlet and the return water inlet are used for changing the flow direction of the cooling medium, so that the cooling medium in the cooling connecting channel can enter the cooling channel in the forming die through the water supply outlet and the water inlet end of the cooling channel in the forming die, and flows through the cooling channel in the forming die and then flows back to the cooling connecting channel through the water outlet end of the cooling channel in the forming die and the return water inlet.

The cooling connecting channel can be formed on the lower die body by adopting machining modes such as drilling and the like, and a middle plug or an end plug can be arranged at a necessary position. The water supply outlet and the water return inlet can be formed on the lower die body by adopting machining modes such as drilling and the like. The cooling channel in the forming die can be formed on the forming die by adopting a machining mode such as drilling and the like, and an intermediate plug or an end plug can be arranged at a necessary position.

In a more preferable scheme, the water supply outlet and the water return inlet are arranged on the upper surface of the lower die body, and correspondingly, the water inlet end and the water outlet end of the cooling channel in the forming die are arranged on the lower surface of the forming die. When the forming die is arranged on the lower die body, the water inlet end and the water outlet end of the cooling channel in the forming die respectively correspond to the positions of the corresponding water supply outlet and the water return inlet.

In a specific embodiment, the upper cutting dies and the upper cutting die plate are integrally formed. In another specific scheme, a plurality of upper shear mold cavities are arranged on the upper shear mold plate, the upper shear molds and the upper shear mold cavities are in the same number and are in one-to-one correspondence, and the upper shear molds are arranged in the upper shear mold cavities.

In a specific embodiment, the lower cutting dies and the lower cutting die plate are integrally formed. In another specific scheme, a plurality of lower shear mold cavities are arranged on the lower shear template, the lower shear molds and the lower shear mold cavities are in the same number and are in one-to-one correspondence, and the lower shear molds are arranged in the lower shear mold cavities.

In a preferred scheme, the thermal forming die further comprises a thimble mounting plate, a thimble mounting plate accommodating cavity is formed in the lower die body, and the thimble mounting plate is arranged in the thimble mounting plate accommodating cavity; each forming die is provided with at least one thimble through hole in the vertical direction, the upper end of the thimble through hole is opened on the inner wall of the die cavity of the forming die, and the lower end of the thimble through hole is opened on the lower surface of the forming die; the thimble through hole is internally provided with a thimble, and the lower end of each thimble is connected with the thimble mounting plate; the lower die further comprises an ejector rod mounting plate and an ejector rod, the ejector rod mounting plate is arranged below the lower die plate, the upper end of the ejector rod is connected with the ejector pin mounting plate, and the lower end of the ejector rod is connected with the ejector rod mounting plate. The thimble can move up and down along the thimble through hole. The thimble descends and shrinks into the thimble through hole during molding; after the forming and shearing are finished, the ejector rod mounting plate drives the ejector pins to ascend relative to the lower template through the ejector rods and the ejector pin mounting plate, the ejector pins extend out of the upper ends of the ejector pin through holes, and the plastic product is ejected out of the forming die, so that the plastic container is separated from the forming die.

In another preferred scheme, the thermoforming mold further comprises a thimble mounting plate and a thimble lifting driving mechanism, wherein a thimble mounting plate accommodating cavity is formed in the lower mold body, and the thimble mounting plate is arranged in the thimble mounting plate accommodating cavity; each forming die is provided with at least one thimble through hole in the vertical direction, the upper end of the thimble through hole is opened on the inner wall of the die cavity of the forming die, and the lower end of the thimble through hole is opened on the lower surface of the forming die; the thimble through hole is internally provided with a thimble, and the lower end of each thimble is connected with the thimble mounting plate; the thimble mounting plate is connected with the thimble lifting driving mechanism. The thimble lifting driving mechanism has the following functions: when demoulding, the thimble mounting plate and each thimble are driven to rise, so that the upper end of the thimble extends out of the upper end of the thimble through hole and pushes the plastic product, and the plastic product is separated from the forming die; after demolding is completed, the thimble mounting plate and the thimbles are driven to descend, and the thimbles are made to return to positions required by molding. The thimble lifting driving mechanism can adopt an air cylinder, the cylinder body of the air cylinder is fixedly arranged on the lower template, the piston rod of the air cylinder is connected with the thimble mounting plate, and the piston rod of the air cylinder can face upwards or downwards.

In order to enable the thimble mounting plate and the thimble to lift more stably, a guide post in the vertical direction is preferably arranged in the cavity of the thimble mounting plate, the guide post is fixedly connected with the lower die body, a thimble mounting plate guide hole or a thimble mounting plate guide sleeve is arranged on the thimble mounting plate, and the thimble mounting plate is sleeved on the guide post through the thimble mounting plate guide hole or the thimble mounting plate guide sleeve and is in sliding fit with the guide post.

In order to make the stress of the plastic product uniform, each forming die is respectively provided with a plurality of thimble through holes, and correspondingly, each forming die corresponds to a plurality of thimbles. The position of each thimble through hole can be set according to the concrete shape of the forming die cavity.

In general, the positions of the thimble through holes in the forming dies are identical, so that the positions of the thimbles do not need to be adjusted when the forming dies need to be replaced. The molding dies may be all the same or different in cavity shape (for example, three different cavities may be provided) in the same thermoforming die.

Generally, the shape and size of the cross section of the thimble through hole are matched with those of the thimble, and the inner wall of the thimble through hole plays a role in guiding the lifting of the thimble. For convenience of processing, the cross section shapes of the thimble through hole and the thimble are generally circular.

In an optimized scheme, the upper die further comprises a plurality of material pressing rings, the material pressing rings correspond to the upper shearing dies in the same number one by one, the material pressing rings are arranged in cavities of the upper shearing dies, and the lower end faces of the material pressing rings are matched with the upper end faces of the lower shearing dies and correspond to the upper end faces of the lower shearing dies in position. The material pressing ring can move up and down in the cavity of the upper shearing die, and the material pressing ring presses the sheet material on the lower die during die assembly.

Usually, the inner edge of the lower end of the upper shear die is an upper shear blade, the outer edge of the upper end of the lower shear die is a lower shear blade, and the lower shear blade is matched with the upper shear blade.

During molding, the upper die can be fixed on the frame, and the lower die can be lifted relative to the upper die; the lower die can also be fixed on the frame, and the upper die can be lifted relative to the lower die.

The utility model discloses set up in each moulded die in-mould cooling channel, cooling medium is carried for each moulded die internal cooling channel through the cooling connecting channel who locates in the die body down, and the heat on the moulded die is taken away to cooling medium when flowing through in-mould cooling channel, cools off the moulded die and the plastic sheet of hugging closely the moulded die, and cooling efficiency is high, fast to improve production efficiency, and be favorable to improving plastic products's quality.

Drawings

Fig. 1 is a schematic structural view (mold clamping state) of a preferred embodiment of the present invention;

fig. 2 is a top view of a lower mold body according to a preferred embodiment of the present invention.

Detailed Description

Example 1

As shown in fig. 1, the thermoforming mold having the novel cooling structure includes an upper mold 1 and a lower mold 2.

The upper die 1 includes an upper die plate 11 and an upper shear die plate 12, the upper shear die plate 12 is mounted on the upper die plate 11 and located below the upper die plate 11, the upper shear die plate 12 is provided with a plurality of upper shear dies 13 (in this embodiment, each upper shear die 13 is integrated with the upper shear die plate 12), and the upper shear dies 13 have a cavity.

The upper die 1 further comprises a plurality of material pressing rings 14, the material pressing rings 14 are the same in number and correspond to the upper shear dies 13 one by one, the material pressing rings 14 are arranged in the cavities of the upper shear dies 13, and the lower end faces of the material pressing rings 14 are matched with the upper end faces of the lower shear dies 25 and correspond in position. The material pressing ring 14 can move up and down in the cavity of the upper shearing die 13, and the material pressing ring 14 presses the plastic sheet on the lower die 2 during die assembly. In this embodiment, a compression spring 15 is installed between the pressing ring 14 and the upper mold plate 11, and when the compression spring 15 contracts, the pressing ring 14 can apply a certain pressure to the plastic sheet to be molded.

The upper die 1 further comprises a stretching mechanism, the stretching mechanism comprises a plurality of stretching heads 16, a plurality of stretching rods 17, a stretching rod mounting plate 18 and a stretching rod mounting plate lifting control mechanism, the number of the stretching heads 16 is the same as that of the upper shear die 13, the number of the stretching rods 17 is the same as that of the stretching heads 16, the stretching heads 16 are arranged in a cavity of the upper shear die 13 (the stretching heads 16 are arranged in a cavity of the material pressing ring 14), the lower ends of the stretching rods 17 are connected with the stretching heads 16, the upper ends of the stretching rods 17 extend out of the upper portion of the upper die plate 11 and are connected with the stretching rod. The lifting control mechanism of the stretching rod mounting plate can be arranged on the upper template; the lifting control mechanism of the stretching rod mounting plate can also be arranged on the frame under the condition that the upper die is fixed on the frame. The stretching rod mounting plate lifting control mechanism is used for driving the stretching rod 17 to move up and down; the stretching head 16 is movable up and down in the cavity of the upper shear die 13 by the driving of the stretching rod 17. When the stretching rod mounting plate lifting control mechanism drives the stretching rod mounting plate 18 to lift, the stretching rod mounting plate 18, the stretching rods 17 and the stretching heads 16 lift together, and when the stretching heads 16 descend, the sheet to be molded is prestretched. The stretching rod mounting plate lifting control mechanism can comprise a stretching cylinder, and the stretching rod mounting plate is connected with a piston rod of the stretching cylinder; the cylinder body of the stretching cylinder can be arranged on the upper template; the cylinder body of the stretching cylinder can also be arranged on the frame under the condition that the upper die is fixed on the frame.

The upper template 11 is provided with a stretching rod guide sleeve 19 which runs up and down, and the stretching rod 17 is positioned in the stretching rod guide sleeve 19 and is in sliding fit with the stretching rod guide sleeve 19.

The lower die 2 includes a lower die plate 21, a lower die body 22, a lower shear die plate 23 and a plurality of forming dies 24, the lower die body 22 is mounted on the lower die plate 21 and located above the lower die plate 21, the lower shear die plate 23 is mounted on the lower die body 22 and located above the lower die body 22, the lower shear die plate 23 is provided with a plurality of lower shear dies 25 (in this embodiment, each lower shear die 25 and the lower shear die plate 23 are integrally formed), the lower shear dies 25 are the same in number and correspond to the upper shear dies 13 one by one, the forming dies 24 are the same in number and correspond to the lower shear dies 25 one by one, and the forming dies 24 are mounted on the lower die body 22 and located inside the corresponding lower shear dies 25.

The lower die body 22 is provided with a cooling connecting channel 26, and each forming die 24 is provided with a forming die internal cooling channel 27; the in-mold cooling channel 27 has a water inlet end 271 and a water outlet end 272, and the water inlet end 271 and the water outlet end 272 of the in-mold cooling channel 27 are respectively communicated with the cooling connecting channel 26; the cooling medium in the cooling connecting channel 26 enters the in-mold cooling channel 27 through the in-mold cooling channel water inlet end 271, and flows through the in-mold cooling channel 27 and then flows back into the cooling connecting channel 26 through the in-mold cooling channel water outlet end 272.

Referring to fig. 2, in the present embodiment, the cooling connection passage 26 has a water inlet 261 and a water outlet 262, and the water inlet 261 and the water outlet 262 are respectively provided at both ends of the cooling connection passage 26. An inlet pipe connector 28 is mounted at the inlet 261 and an outlet pipe connector 29 is mounted at the outlet 262. The cooling connecting channel 26 is provided with a plurality of pairs of water supply outlets 263 and water return inlets 264, and the pair of water supply outlets 263 and water return inlets 264 correspond to one in-mold cooling channel 27; in the same pair of the water supply outlet 263 and the water return inlet 264, the water supply outlet 263 is communicated with the water inlet end 271 of the corresponding in-mold cooling passage 27, the water return inlet 264 is communicated with the water outlet end 272 of the corresponding in-mold cooling passage 27, and an intermediate plug 265 is provided in a portion of the cooling connecting passage 26 between the same pair of the water supply outlet 263 and the water return inlet 264. The intermediate plugs 265 in the portions between the water supply outlet 263 and the water return inlet 264 of the same pair are used to change the flow direction of the cooling medium, so that the cooling medium in the cooling connecting channel 26 can enter the in-mold cooling channel 27 through the water supply outlet 263 and the in-mold cooling channel water inlet 271, and after flowing through the in-mold cooling channel 27, flow back into the cooling connecting channel 26 through the in-mold cooling channel water outlet 272 and the water return inlet 264.

In this embodiment, the water supply outlet 263 and the water return inlet 264 are provided on the upper surface of the lower mold body 22, and correspondingly, the water inlet end 271 and the water outlet end 272 of the cooling passage 27 in the molding die are provided on the lower surface of the molding die 24. When the forming die 24 is mounted on the lower die body 22, the water inlet end 271 and the water outlet end 272 of the cooling channel 27 in the forming die correspond to the corresponding positions of the water supply outlet 263 and the water return inlet 264, respectively.

The cooling connecting passage 26 is formed in the lower mold block 22 by machining such as drilling, and an intermediate plug 265 or an end plug 266 may be provided where necessary. The water supply outlet 263 and the water return inlet 264 are formed in the lower mold body 22 by machining such as drilling. The cooling channel 27 is formed in the forming die 24 by drilling or other machining means, and an intermediate plug or an end plug (e.g., end plug 273) may be provided at a desired position.

The thermoforming mold of the present embodiment further includes a thimble mounting plate 210, a thimble mounting plate accommodating cavity 211 is provided in the lower mold body 22, and the thimble mounting plate 210 is provided in the thimble mounting plate accommodating cavity 211; each forming die 24 is provided with a plurality of pin through holes 212 running up and down, the upper ends of the pin through holes 212 are opened on the inner wall of the die cavity of the forming die 24, and the lower ends of the pin through holes 212 are opened on the lower surface of the forming die 24; the thimble through holes 212 are provided with thimbles 213, and the lower ends of the thimbles 213 are connected with the thimble mounting plate 210 (the positions of the lower die body 22 corresponding to the thimble through holes 212 are respectively provided with a through hole 224, and the thimble 213 passes through the through hole 224); the lower die 2 further comprises an ejector rod mounting plate 214 and an ejector rod 215, the ejector rod mounting plate 214 is arranged below the lower die plate 21, the upper end of the ejector rod 215 is connected with the ejector pin mounting plate 210, and the lower end of the ejector rod 215 is connected with the ejector rod mounting plate 214. The thimble 213 is movable up and down along the thimble through hole 212.

A tube positive guide post 216 which runs up and down is arranged on the lower template 21, the upper end of the tube positive guide post 216 is connected with the lower template 21, a tube positive guide sleeve 217 is arranged on the ejector rod mounting plate 214, and the tube positive guide post 216 is positioned in the tube positive guide sleeve 217; when the ejector pin mounting plate 214 is lifted relative to the lower die plate 21, the tube guide 217 slides along the tube guide post 216, and guides the ejector pin mounting plate 214, the ejector pin 215, the ejector pin mounting plate 210, and the ejector pin 213 to be lifted more smoothly.

An upper limiting washer 218 is arranged at the lower part of the ejector rod 215, and the lower end surface of the upper limiting washer 218 is tightly contacted with the upper surface of the ejector rod mounting plate 214; during the raising of the ejector rod mounting plate 214, when the upper end surface of the upper limit washer 218 contacts the lower surface of the lower die plate 21, the ejector rod mounting plate 214 is no longer raised.

A limiting shaft 219 moving up and down is arranged on the lower template 21, a limiting through hole 220 is arranged on the ejector rod mounting plate 214, the limiting shaft 219 is positioned in the limiting through hole 220, a lower limiting washer 221 is arranged at the lower end of the limiting shaft 219, and the lower limiting washer 221 is positioned below the ejector rod mounting plate 214; when the lower surface of the knock-out bar mounting plate 214 contacts the upper end surface of the lower limit washer 221 during the descent of the knock-out bar mounting plate 214, the knock-out bar mounting plate 214 does not descend any more.

A vertically-moving guide post 222 is arranged in the needle mounting plate accommodating cavity 211, the guide post 222 is fixedly connected with the lower mold body 22, a needle mounting plate guide sleeve 223 is arranged on the needle mounting plate 210, and the needle mounting plate 210 is sleeved on the guide post 222 through the needle mounting plate guide sleeve 223 and is in sliding fit with the guide post 222.

Each forming die 24 is provided with a plurality of thimble through holes 212, and correspondingly, each forming die 24 corresponds to a plurality of thimbles 213. The position of each ejector pin through hole 212 may be set according to the specific shape of the molding die cavity.

The positions of the thimble through holes 212 in the forming dies 24 are matched, so that the positions of the thimbles 213 do not need to be adjusted when the forming dies 24 need to be replaced. The molding dies 24 may be all the same or different in cavity shape (for example, three different cavities may be provided) in the same thermoforming die.

The shape and size of the cross section of the thimble through hole 212 is matched with the shape and size of the cross section of the thimble 213, and the inner wall of the thimble through hole 212 plays a role in guiding the lift of the thimble 213. The cross-sectional shapes of the spike through hole 212 and the spike 213 are generally circular.

The inner edge of the lower end of the upper shear die 13 is an upper shear blade, the outer edge of the upper end of the lower shear die 25 is a lower shear blade, and the lower shear blade is matched with the upper shear blade.

In the thermoforming mold, a forming mold 24, a lower shear mold 25, an upper shear mold 13, a material pressing ring 14 and a stretching head 16 form forming units, and one forming unit can form a plastic container.

The working principle of the thermoforming mold is briefly described as follows:

during molding, the upper die 1 is fixed on the frame, and the lower die 2 is lifted relative to the upper die 1.

When the plastic container is manufactured, firstly, the plastic sheet is heated to enable the plastic sheet to reach the molding temperature; the heated plastic sheet passes through a molding area, the thermoforming mold is closed at the moment, the compression spring 15 applies downward thrust to the pressing ring 14, so that the pressing ring 14 presses the plastic sheet on the upper end surface of the lower shear mold 25, and a molding air chamber is formed between the plastic sheet and the cavity of the upper shear mold 13; then the stretching rod mounting plate lifting control mechanism drives the stretching rod mounting plate 18 to descend, and the stretching rod mounting plate 18, the stretching rods 17 and the stretching heads 16 descend together; the stretching head 16 prestretches the plastic sheet; then the compressed air enters the molding air chamber, the plastic sheet is tightly attached to the molding die 24 (the thimble 212 descends and shrinks into the thimble through hole 213 during molding) under the action of the compressed air, so that the plastic sheet is molded, and cooling water is introduced into the cooling channel 27 in the molding die to cool the molding die 24, so that the molded sheet is shaped; then the stretching rod mounting plate lifting control mechanism drives the stretching rod mounting plate 18, the stretching rods 17 and the stretching heads 16 to lift together, and the stretching heads 16 return to the cavity of the upper shear die 13; then the lower die 2 further rises, the lower shearing blade at the outer edge of the upper end of the lower shearing die 25 is matched with the upper shearing blade at the inner edge of the lower end of the upper shearing die 13, the shaped formed sheet is sheared, and the plastic container is sheared from the formed sheet; the lower die 2 is then lowered, the edge of the plastic container leaving the presser ring 14; then the ejector rod mounting plate 214 drives each ejector pin 213 to ascend relative to the lower template 21 through the ejector rod 215 and the ejector pin mounting plate 210, each ejector pin 213 extends out of the upper end of the ejector pin through hole 212, and the plastic product is ejected from the forming die 24, so that the plastic container is separated from the forming die 24; air may then be blown into the plastic container to blow the plastic container away from the thermoforming mold, thereby completing the one-shot thermoforming process. The ejector rod mounting plate 214, the ejector rod 215, the ejector pin mounting plate 210, and the ejector pins 213 are then lowered to drive the movable bottom molds 232 to be lowered to the desired positions for molding, and are ready for the next thermal molding process.

The cooling principle for the forming die 24 is: the cooling connecting channel 26 connects the in-mold cooling channels 27 of the molding molds 24 in series to form a required cooling water path; cooling water enters the cooling connecting channel 26 from the water inlet pipe joint 28 and the water inlet 261, sequentially flows through the cooling channels 27 in each forming die, cools each forming die 24, and then flows out from the water outlet 262 and the water outlet pipe joint 29; the cooling water carries heat away from the molding die 24 when flowing through the in-die cooling passage 27, and cools the molding die 24 and the plastic sheet adhered to the molding die 24.

In other embodiments, the structure for realizing the demoulding of the plastic product by the thermal forming mould also can comprise a thimble mounting plate and a thimble lifting driving mechanism, wherein a thimble mounting plate accommodating cavity is arranged in the lower mould body, and the thimble mounting plate is arranged in the thimble mounting plate accommodating cavity; each forming die is provided with at least one thimble through hole in the vertical direction, the upper end of the thimble through hole is opened on the inner wall of the die cavity of the forming die, and the lower end of the thimble through hole is opened on the lower surface of the forming die; the thimble through hole is internally provided with a thimble, and the lower end of each thimble is connected with the thimble mounting plate; the thimble mounting plate is connected with the thimble lifting driving mechanism. The thimble lifting driving mechanism has the following functions: when demoulding, the thimble mounting plate and each thimble are driven to rise, so that the upper end of the thimble extends out of the upper end of the thimble through hole and pushes the plastic product, and the plastic product is separated from the forming die; after demolding is completed, the thimble mounting plate and the thimbles are driven to descend, and the thimbles are made to return to positions required by molding. The thimble lifting driving mechanism can adopt an air cylinder, the cylinder body of the air cylinder is fixedly arranged on the lower template, the piston rod of the air cylinder is connected with the thimble mounting plate, and the piston rod of the air cylinder can face upwards or downwards.

In other embodiments, the cooling connecting channel may also have a plurality of water inlets and a plurality of water outlets. The water inlet and the water outlet are arranged in pairs. In the case of a plurality of water inlets, the water inlets can be combined by a pipeline to a water inlet pipe connection, from which the cooling medium is supplied and distributed to the water inlets. Under the condition that a plurality of water outlets are arranged, all the water outlets can be gathered to a water outlet pipe joint through pipelines, and cooling media flowing out of all the water outlets are gathered to the water outlet pipe joint and then discharged. The cooling medium enters the cooling connecting channel from the water inlet pipe joint and each water inlet, flows through the cooling channel in each forming die, and flows out of the thermal forming die from each water outlet and the water outlet pipe joint after cooling each forming die.

In other embodiments, the upper shear die may be arranged in the following manner: a plurality of upper shear die containing cavities are formed in the upper shear template, the upper shear dies and the upper shear die containing cavities are identical in number and correspond to each other one by one, and the upper shear dies are arranged in the upper shear die containing cavities. The setting mode of the lower shear die can also be as follows: the lower shear die is provided with a plurality of lower shear die containing cavities, the lower shear die and the lower shear die containing cavities are same in number and are in one-to-one correspondence, and the lower shear die is arranged in the lower shear die containing cavities.

Claims (8)

1. A thermal forming die with a novel cooling structure comprises an upper die and a lower die; the upper die comprises an upper die plate and an upper shearing die plate, the upper shearing die plate is arranged on the upper die plate and is positioned below the upper die plate, a plurality of upper shearing dies are arranged on the upper shearing die plate, and each upper shearing die is provided with a cavity; the lower mould includes the lower bolster, the lower mould body, lower shear template and a plurality of moulded die, the lower mould body is installed on the lower bolster and is located in the lower bolster top, lower shear template is installed on the lower mould body and is in lower mould body top, be equipped with a plurality of shear modes down on the shear template down, lower shear mode is the same with last shear mode quantity and one-to-one, the moulded die is the same with lower shear mode quantity and one-to-one, the moulded die is installed on the lower mould body and is in the inboard of the lower shear mode of correspondence, characterized by: the lower die body is provided with a cooling connecting channel, and each forming die is provided with a forming die internal cooling channel; the cooling channel in the forming die is provided with a water inlet end and a water outlet end, and the water inlet end and the water outlet end of the cooling channel in the forming die are respectively communicated with the cooling connecting channel; the cooling medium in the cooling connecting channel enters the in-forming die cooling channel through the in-forming die cooling channel water inlet end, flows through the in-forming die cooling channel and then flows back to the cooling connecting channel through the in-forming die cooling channel water outlet end.

2. The thermoforming mold with the novel cooling structure as claimed in claim 1, wherein: the cooling connecting channel is provided with a plurality of pairs of water supply outlets and water return inlets, and the pair of water supply outlets and the water return inlets correspond to one cooling channel in the forming die; and in the same pair of water supply outlet and water return inlet, the water supply outlet is communicated with the water inlet end of the corresponding cooling channel in the forming die, the water return inlet is communicated with the water outlet end of the corresponding cooling channel in the forming die, and a middle plug is arranged in the part of the cooling connecting channel between the same pair of water supply outlet and water return inlet.

3. The thermoforming mold with the novel cooling structure as claimed in claim 2, wherein: the water supply outlet and the water return inlet are arranged on the upper surface of the lower die body; the water inlet end and the water outlet end of the cooling channel in the forming die are arranged on the lower surface of the forming die.

4. The thermoforming mold with the novel cooling structure as claimed in claim 1, wherein: the thermal forming die also comprises a thimble mounting plate, a thimble mounting plate accommodating cavity is arranged in the lower die body, and the thimble mounting plate is arranged in the thimble mounting plate accommodating cavity; each forming die is provided with at least one thimble through hole in the vertical direction, the upper end of the thimble through hole is opened on the inner wall of the die cavity of the forming die, and the lower end of the thimble through hole is opened on the lower surface of the forming die; the thimble through hole is internally provided with a thimble, and the lower end of each thimble is connected with the thimble mounting plate; the lower die further comprises an ejector rod mounting plate and an ejector rod, the ejector rod mounting plate is arranged below the lower die plate, the upper end of the ejector rod is connected with the ejector pin mounting plate, and the lower end of the ejector rod is connected with the ejector rod mounting plate.

5. The thermoforming mold with the novel cooling structure as claimed in claim 1, wherein: the thermal forming die also comprises a thimble mounting plate and a thimble lifting driving mechanism, wherein a thimble mounting plate accommodating cavity is formed in the lower die body, and the thimble mounting plate is arranged in the thimble mounting plate accommodating cavity; each forming die is provided with at least one thimble through hole in the vertical direction, the upper end of the thimble through hole is opened on the inner wall of the die cavity of the forming die, and the lower end of the thimble through hole is opened on the lower surface of the forming die; the thimble through hole is internally provided with a thimble, and the lower end of each thimble is connected with the thimble mounting plate; the thimble mounting plate is connected with the thimble lifting driving mechanism.

6. The thermoforming mold with the novel cooling structure as claimed in claim 5, wherein: the thimble lifting driving mechanism adopts an air cylinder, the cylinder body of the air cylinder is fixedly installed on the lower template, the piston rod of the air cylinder is connected with the thimble installation plate, and the piston rod of the air cylinder faces upwards or downwards.

7. The thermoforming mold with the novel cooling structure as claimed in any of claims 4 to 6, wherein: the thimble mounting plate is provided with a guide post moving up and down in the cavity, the guide post is fixedly connected with the lower die body, a thimble mounting plate guide hole or a thimble mounting plate guide sleeve is arranged on the thimble mounting plate, and the thimble mounting plate is sleeved on the guide post through the thimble mounting plate guide hole or the thimble mounting plate guide sleeve and is in sliding fit with the guide post.

8. The thermoforming mold with the novel cooling structure as claimed in any of claims 4 to 6, wherein: the arrangement positions of the thimble through holes on each forming die are consistent; the shape and the size of the cross section of the thimble through hole are matched with those of the thimble.

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