CN210501381U - Thermoforming mould with ejection rod quick adjustment limit structure - Google Patents

Abstract

A thermal forming die with a rapid adjusting and limiting structure of an ejector rod comprises an upper die and a lower die; the upper die comprises an upper template, an upper die body and an upper shearing die; the lower die comprises a lower die plate, a lower die body, a lower shearing die, a forming die and an ejector rod, the forming die comprises a side die and a movable bottom die, the movable bottom die is connected with the upper end of the ejector rod, and the lower end of the ejector rod extends to the lower part of the lower die plate and is connected with an ejector rod mounting plate; be equipped with the spacing axle of upper and lower trend on the lower bolster, spacing axle lower extreme has cup jointed down spacing packing ring, and lower spacing packing ring is in ejector pin mounting panel below, characterized by: the hot forming die is provided with a plurality of side dies; the hot forming die also comprises at least one adjusting gasket which can be selectively arranged on the limiting shaft; the adjusting gasket is arranged between the ejector rod mounting plate and the lower limiting washer when being arranged on the limiting shaft. The utility model discloses when the side forms of different specifications need to be changed, through change, install additional or lift adjusting shim off, can make ejector pin mounting panel, ejector pin and activity die block be in required high position.

Description

Thermoforming mould with ejection rod quick adjustment limit structure

Technical Field

The utility model relates to a thermoforming equipment, concretely relates to thermoforming mould with ejector pin quick adjustment limit structure.

Background

The existing thermoforming mould for manufacturing plastic products (such as plastic cups, plastic boxes, plastic covers and the like) can complete the forming and shearing actions. The hot forming die comprises an upper die and a lower die; the upper die generally comprises an upper die plate, an upper die body, an upper shear die and a material pressing ring, wherein the upper die body is arranged on the upper die plate and is positioned below the upper die plate, the upper shear die is arranged on the upper die body and is positioned below the upper die body, the upper shear die is provided with a cavity, the inner edge of the lower end of the upper shear die is an upper shear blade, the material pressing ring can move up and down in the cavity of the upper shear die, and the material pressing ring presses the sheet material onto the lower die when the die is closed; the lower die comprises a lower die plate, a lower die body, a lower shearing die, a forming die and an ejector rod, wherein the lower die body is arranged on the lower die plate and is positioned above the lower die plate, the lower shearing die is arranged on the lower die body and is positioned above the lower die body, the outer edge of the upper end of the lower shearing die is a lower shearing cutting edge generally, the lower shearing cutting edge is matched with the upper shearing cutting edge (the upper shearing cutting edge and the lower shearing cutting edge are both annular cutting edges), the forming die comprises a side die and a movable bottom die, the side die is arranged on the lower die body and is positioned at the inner side of the lower shearing die, the movable bottom die is arranged at the inner side of the side die and is connected with the upper end of the ejector rod, and the lower end.

When the plastic product 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, the thermal forming die is closed, and the plastic sheet is tightly attached to the forming die through positive pressure thermal forming or negative pressure thermal forming; the formed sheet material is sheared by an upper shearing blade and a lower shearing blade, and the plastic product is sheared from the formed sheet material to obtain a single plastic product; then the ejector rod mounting plate, the ejector rod and the movable bottom die are lifted relative to the lower die plate, and the plastic product is ejected from the forming die, so that the plastic product is separated from the forming die; then blowing air to the plastic product to blow the plastic product away from the thermal forming die to complete the one-step forming process.

After the one-time forming process is finished, the ejector rod mounting plate, the ejector rod and the movable bottom die are descended relative to the lower die plate, and the movable bottom die is returned to the position required by forming to prepare for the next one-time thermal forming process. In order to allow the movable bottom mold to return to the position required for molding accurately, the following stopper structures are provided on the thermoforming mold (for example, the present applicant has been filed with No. CN206254488U, a prior application entitled "a thermoforming mold for manufacturing plastic containers with annular legs", and has been filed with No. CN207607102U, a prior application entitled "a thermoforming mold with knurling function"): the lower template is provided with a limit shaft moving up and down, the ejector rod mounting plate is provided with a limit through hole, the limit shaft is positioned in the limit through hole, the lower end of the limit shaft is sleeved with a lower limit gasket, and the lower limit gasket is positioned below the ejector rod mounting plate. Like this, ejector pin mounting panel, ejector pin and activity die block are at the decline in-process, and when the lower surface of ejector pin mounting panel contacted the up end of lower spacing packing ring, the ejector pin mounting panel no longer descends, and the activity die block returns to the required position of shaping this moment.

In order to save equipment cost, in the design of the thermoforming mold, one mold is multipurpose by replacing side molds, namely, one set of thermoforming mold is provided with a plurality of side molds with different specifications for producing plastic products with different specifications (for example, the shapes and the sizes of the cup bottom and the cup mouth are the same, and the heights of the plastic cups are different). When a plastic product with another specification needs to be produced, the original side die is disassembled, and then another side die is installed, so that the die is modified. However, since the heights of the side forms with different specifications are often different, after the replacement of the side forms is completed, the limiting shafts with corresponding lengths need to be replaced, and the height positions of the ejector rod mounting plate, the ejector rod and the movable bottom die are adjusted and calibrated again, so that the process is complicated, long time is needed, and the normal operation of production is influenced.

Disclosure of Invention

The utility model aims to solve the technical problem that a thermoforming mould with ejector pin quick adjustment limit structure is provided, this kind of thermoforming mould can conveniently adjust the high position of ejector pin mounting panel, ejector pin and activity die block fast when changing the side forms of different specifications, saves time. The technical scheme is as follows:

a thermal forming die with a rapid adjusting and limiting structure of an ejector rod comprises an upper die and a lower die; the upper die comprises an upper die plate, an upper die body and an upper shear die, the upper die body is arranged on the upper die plate and is positioned below the upper die plate, and the upper shear die is arranged on the upper die body and is positioned below the upper die body; the lower die comprises a lower die plate, a lower die body, a lower shear die, a forming die and an ejector rod, the lower die body is arranged on the lower die plate and is positioned above the lower die plate, the lower shear die is arranged on the lower die body and is positioned above the lower die body, the forming die comprises a side die and a movable bottom die, the side die is arranged on the lower die body and is positioned at the inner side of the lower shear die, the movable bottom die is arranged at the inner side of the side die and is connected with the upper end of the ejector rod, and the lower end of the ejector rod extends out of the lower part of the lower die plate and is connected with an ejector; be equipped with the spacing axle of upper and lower trend on the lower bolster, be equipped with spacing through-hole on the ejector pin mounting panel, spacing axle is in spacing through-hole, and spacing axle lower extreme has cup jointed down spacing packing ring, and spacing packing ring is in ejector pin mounting panel below, characterized by down: the hot forming die is provided with a plurality of side dies; the hot forming die also comprises at least one adjusting gasket which can be selectively arranged on the limiting shaft; the adjusting gasket is arranged between the ejector rod mounting plate and the lower limiting washer when mounted on the limiting shaft, and the lower surface of the adjusting gasket is in contact with the upper surface of the lower limiting washer.

Generally, the side molds of the thermoforming mold have different heights; the various shims associated with the thermoforming mold have different thicknesses (i.e., heights). The smaller the height of the side die (which means the height of the portion of the side die that constitutes the molding cavity), the greater the thickness of the corresponding regulating shim. The number of the adjusting gaskets matched with the hot forming die is usually one less than that of the side dies (the side die with the largest height does not need to be matched with the adjusting gaskets). When supporting side forms and adjusting the gasket, the side forms correspond with adjusting the gasket and are in groups, can place the side forms of group and adjusting the gasket together (still can make the mark on side forms and adjusting the gasket for the discernment) so that operating personnel accurately takes.

When the thermal forming die is used for producing plastic products with the maximum height, the adjusting gasket does not need to be installed on the limiting shaft generally, and the ejector rod installing plate, the ejector rod and the movable bottom die are located at the lowest height position after reset. When a plastic product with a smaller height needs to be produced, the adjusting gasket with corresponding thickness is installed after the side die with the smaller height is replaced, so that the movable bottom die can be located at a higher position after descending and resetting relative to the lower template, and the requirement on the position of the movable bottom die during the forming of a new plastic product is met.

The hot forming die is matched with a plurality of side dies with different specifications, the multi-purpose die is realized by replacing the side dies, and the side dies and the movable bottom die form the forming die with corresponding specifications for producing plastic products with different specifications (such as plastic cups with the same shapes and sizes of cup bottoms and cup mouths and different heights). When a plastic product with another specification needs to be produced, the original side die is detached, and then another side die is installed; and then, according to actual conditions, replacing, additionally installing or detaching the adjusting gasket to enable the ejector rod mounting plate, the ejector rod and the movable bottom die to be positioned at required height positions so as to complete the refitting of the die (when the thermoforming die is provided with a stretching head, the stretching head corresponding to the side die is usually required to be replaced). Because every side forms all has corresponding adjusting shim, adjusting shim is processed to required thickness in advance, consequently, change, install additional or lift off adjusting shim after, need not to adjust again and calibrate, spacing axle also need not to change, can accomplish the repacking of mould fast.

In a preferred scheme, two notches are arranged in the middle of the limiting shaft, the two notches are positioned at the same height position and are respectively positioned at two sides of the limiting shaft, and the part, positioned between the two notches, on the limiting shaft forms a plugging part; the central part of adjusting shim is equipped with the hole of cup jointing, cup joints the shape and the size and the spacing axle phase-match in hole, and adjusting shim one side is equipped with the plug mouth, plug mouth and cup joint the hole intercommunication, and the width of plug mouth and the width phase-match of plug portion, adjusting shim can cup joint on spacing epaxially (during cup jointing the spacing axle is in cup jointing the hole). The width of the plugging part refers to the distance between the bottoms of the two notches. The width of the plugging opening is usually slightly larger than that of the plugging part and smaller than the size of the rest part of the limiting shaft. When the adjusting gasket needs to be installed, the ejector rod mounting plate is lifted (at the moment, the ejector rod and the movable bottom die rise along with the lifting), so that the ejector rod mounting plate is higher than the plugging part; then, two sides of the plugging and unplugging opening of the adjusting gasket are respectively aligned to the two notches, and the adjusting gasket is transversely moved to enable the plugging and unplugging part to enter the sleeving hole; then, the adjusting gasket descends along the limiting shaft until the lower surface of the adjusting gasket is contacted with the upper surface of the lower limiting washer; and then, the ejector rod mounting plate is lowered until the ejector rod mounting plate contacts the upper surface of the adjusting gasket, and at the moment, the movable bottom die is lowered to a position required by forming. When the adjusting gasket needs to be dismounted, the ejector rod mounting plate is lifted (at the moment, the ejector rod and the movable bottom die rise along with the lifting), so that the ejector rod mounting plate is higher than the plugging part; then, the adjusting gasket rises to a position corresponding to the plugging part along the limiting shaft; and then, two sides of the plugging and unplugging opening of the adjusting gasket are respectively aligned to the two notches, the adjusting gasket is transversely moved, the plugging and unplugging part is separated from the sleeve hole, and the adjusting gasket can be taken down from the limiting shaft.

Usually, the position that plug portion located is higher than the height that the ejector pin mounting panel can reach during normal production, and like this, adjusting shim can not reach plug portion position during normal production to avoid adjusting shim pine to take off.

In a more preferable scheme, the cross section of the limiting shaft is circular, and the bottoms of the two notches are both flat and parallel to each other; the adjusting gasket is C-shaped, the sleeving hole is circular, and the width of the plugging port is smaller than the diameter of the sleeving hole. Thus, the adjusting washer can rotate around the limiting shaft.

In a specific scheme, the forming die comprises a side die and a movable bottom die, wherein a supporting leg side surface forming copper sleeve and a supporting leg bottom surface forming copper sleeve are fixedly mounted on the inner side of the lower portion of the side die, the supporting leg side surface forming copper sleeve is superposed on the upper end surface of the supporting leg bottom surface forming copper sleeve, and the movable bottom die is located in a cavity of the supporting leg bottom surface forming copper sleeve. The inner side surface of the supporting leg side forming copper sleeve and the annular part of the upper end surface of the supporting leg bottom forming copper sleeve, which is positioned at the inner side of the supporting leg side forming copper sleeve, form a part of the forming die cavity. Such a mold can be used to produce containers having feet at the bottom. When in molding, the plastic sheet is tightly attached to the inner side surface of the upper part of the side die, the inner side surface of the supporting leg side molding copper sleeve, the upper end surface of the supporting leg bottom surface molding copper sleeve is positioned at the annular part of the inner side of the supporting leg side molding copper sleeve, and the upper surface of the movable bottom die; when the movable bottom die rises, the sheet attached to the upper surface of the movable bottom die is pushed to rise, and the sheet is overlapped and bonded with the sheet tightly attached to the inner side surface of the forming copper sleeve on the side surface of the support leg to form the support leg.

In another specific embodiment, the forming mold includes a side mold, a leg folding/shaping mold, and a movable bottom mold, the side mold, the leg mold, and the leg folding/shaping mold are all annular, the leg folding/shaping mold is disposed inside the leg mold, the side mold is mounted on the lower mold body and is superposed above the leg mold, and the movable bottom mold is disposed inside the leg folding/shaping mold (the specific structure can refer to publication No. CN206254488U, entitled "a thermoforming mold for manufacturing a plastic container with annular legs"). In the thermoforming mold, the side molds are used for forming the side walls and the edge parts of the plastic container, the movable bottom mold is used for forming the bottom of the plastic container, and the supporting foot mold and the supporting foot folding and shaping mold are jointly used for forming the annular supporting foot. In the scheme, the lower die body and the lower shear die mounting plate are detachably mounted and can be provided with a plurality of side dies and lower die bodies (the height of the lower die body is matched with that of the corresponding side die), and each side die corresponds to one plastic container; the movable bottom die, the supporting foot die and the supporting foot folding and shaping die only need to be configured in one set and can be matched with each side die. When the hot forming die needs to be modified, the side die and the lower die body are replaced, and the adjusting gasket is correspondingly replaced, additionally installed or detached, so that the modification of the die can be quickly and conveniently completed, and the required plastic container can be produced. Such thermoforming molds may be used in the production of a variety of plastic containers (e.g., plastic cups, plastic bowls, plastic trays, etc., which typically have a uniform shape and size of the outer rim, a uniform shape and size of the container bottom and annular leg, and a different shape of the height and sidewall).

In another specific scheme, the forming die only comprises a side die and a movable bottom die. The lower mold may further include a lower embossing mechanism (the specific structure may be referred to as "a thermoforming mold having an embossing function" under publication No. CN 207607102U).

In a specific scheme, the upper die further comprises an upper shear template, the upper shear template is installed on the upper die body and located below the upper die body, an upper shear die accommodating cavity is formed in the upper shear template, and the upper shear die is arranged in the upper shear die accommodating cavity.

In a specific scheme, the lower die further comprises a lower shear template, the lower shear template is mounted on the lower die body and located above the lower die body, a lower shear die accommodating cavity is formed in the lower shear template, and the lower shear die is arranged in the lower shear die accommodating cavity.

In a preferred scheme, the upper die further comprises a material pressing ring, the upper shearing die is provided with a cavity, 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.

In a preferable scheme, the upper die further comprises a stretching mechanism, the stretching mechanism comprises a stretching head, and the stretching head can move up and down in a cavity of the upper shearing die. The thermoforming mould may be provided with a plurality of stretching heads, and after the side mould is replaced, the corresponding stretching heads may be replaced as required.

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 upper shear blade and the lower shear blade are both annular blades).

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 a dispose a plurality of side forms and with the supporting adjusting shim who uses of side form, the thickness and the side form phase-match of each adjusting shim, when the side form of different specifications needs to be changed, through changing, install additional or lift adjusting shim off, can make ejector pin mounting panel, ejector pin and activity die block be in required high position, can conveniently adjust the high position of ejector pin mounting panel, ejector pin and activity die block fast, save time, can reduce operating personnel's intensity of labour, ensure going on smoothly of production.

Drawings

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

FIG. 2 is a schematic view of a retrofit of the thermoforming mold of FIG. 1;

FIG. 3 is a schematic structural view of a post-retrofit thermoforming mold;

FIG. 4 is a top view of the adjustment pad;

FIG. 5 is a cross-sectional view A-A of the spacing shaft of FIG. 1.

Detailed Description

As shown in fig. 1 and 3, the thermoforming mold having the novel punching structure includes an upper mold 1 and a lower mold 2. The thermoforming mold of this embodiment is used to make plastic cups.

The upper die 1 comprises an upper die plate 11, an upper die body 12 and an upper shear die 13, wherein the upper die body 12 is mounted on the upper die plate 11 and is positioned below the upper die plate 11, and the upper shear die 13 is mounted on the upper die body 13 and is positioned below the upper die body 12. In this embodiment, the upper die 1 further includes an upper shear plate 14, the upper shear plate 14 is mounted on the upper die body 12 and located below the upper die body 12, an upper shear cavity 15 is provided on the upper shear plate 14, and the upper shear die 13 is disposed in the upper shear cavity 15.

The upper die 1 further comprises a material pressing ring 16, the upper shear die 13 is provided with a cavity, the material pressing ring 16 is arranged in the cavity of the upper shear die 13, and the lower end surface of the material pressing ring 14 is matched with the upper end surface of the lower shear die 23 and corresponds to the upper end surface of the lower shear die in position. The material pressing ring 16 can move up and down in the cavity of the upper shearing die 13, and the material pressing ring 16 presses the plastic sheet on the lower die 2 during die assembly. A compression spring 17 is arranged between the material pressing ring 16 and the upper template 11, and when the compression spring 17 contracts, the material pressing ring 16 can apply certain pressure on the plastic sheet to be formed.

The upper die 1 further comprises a stretching mechanism, the stretching mechanism comprises a stretching head 18, a stretching rod 19, a stretching rod mounting plate 110 and a stretching rod mounting plate lifting control mechanism, the stretching head 18 is arranged in a cavity of the upper shear die 13 (the stretching head 18 is arranged in a cavity of the material pressing ring 16), the lower end of the stretching rod 19 is connected with the stretching head 18, the upper end of the stretching rod 19 extends out of the upper portion of the upper die plate 11 and is connected with the stretching rod mounting plate 110, and the stretching rod mounting plate 110 is connected with the stretching rod mounting plate lifting control mechanism. 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 19 to move up and down; the stretching head 18 is movable up and down in the cavity of the upper shear die 13 by the driving of the stretching rod 19. When the stretching rod mounting plate elevation control mechanism drives the stretching rod mounting plate 110 to be elevated, the stretching rod mounting plate 110, the stretching rods 19, and the stretching heads 18 are elevated together, and the sheet to be formed is prestretched when the stretching heads 18 are lowered. 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 mold plate 11 is provided with a vertically extending stretching rod guide sleeve 111, and the stretching rod 19 is disposed in the stretching rod guide sleeve 111 and slidably engaged with the stretching rod guide sleeve 111.

The lower die 2 comprises a lower die plate 21, a lower die body 22, a lower shear die 23, a forming die 24 and an ejector rod 25, the lower die body 22 is mounted on the lower die plate 21 and is positioned above the lower die plate 21, the lower shear die 23 is mounted on the lower die body 22 and is positioned above the lower die body 22, the forming die 24 comprises a side die 241 and a movable bottom die 242, the side die 241 is mounted on the lower die body 22 and is positioned at the inner side of the lower shear die 23, the movable bottom die 242 is arranged at the inner side of the side die 241, the movable bottom die 242 is connected with the upper end of the ejector rod 25, and the lower end of the ejector rod 25 extends out of the lower die plate 21 and is connected with an ejector rod; the lower template 21 is provided with a limiting shaft 27 moving up and down, the ejector rod mounting plate 26 is provided with a limiting through hole 28, the limiting shaft 27 is positioned in the limiting through hole 28, the lower end of the limiting shaft 27 is sleeved with a lower limiting washer 29, and the lower limiting washer 29 is positioned below the ejector rod mounting plate 26. The thermoforming mold of the present embodiment is configured with a plurality of side molds 241. The thermoforming mold of the embodiment further comprises at least one adjusting shim 210 selectively mounted on the limiting shaft 27; referring to fig. 3, the adjusting shim 210 is mounted on the stopper shaft 27 between the ejector rod mounting plate 26 and the lower stopper washer 29, and the lower surface of the adjusting shim 210 is in contact with the upper surface of the lower stopper washer 29.

Referring to fig. 1, 3 and 5, two notches 211 are formed in the middle of the limiting shaft 27, the two notches 211 are located at the same height position and are respectively located at two sides of the limiting shaft 27, and a portion of the limiting shaft 27 located between the two notches 211 forms a plug-in portion 212; referring to fig. 4, the central portion of the adjusting shim 210 is provided with a sleeve hole 213, the shape and size of the sleeve hole 213 are matched with the limiting shaft 27, one side of the adjusting shim 210 is provided with a plug port 214, the plug port 214 is communicated with the sleeve hole 213, the width of the plug port 214 is matched with the width of the plug portion 212, and the adjusting shim 210 can be sleeved on the limiting shaft 27 (the limiting shaft 27 is located in the sleeve hole 213 during sleeve). The width of the plug portion 212 refers to the distance between the two notch bottoms 215. The width of the insertion opening 214 is generally slightly larger than the width of the insertion portion 212 and smaller than the size of the rest of the limiting shaft 27. The position of the plugging portion 212 is higher than the height that the ejector rod mounting plate 26 can reach during normal production, so that the adjusting gasket 210 does not reach the position of the plugging portion 212 during normal production, and the adjusting gasket is prevented from loosening.

In this embodiment, the cross section of the limiting shaft 27 is circular, and the bottoms 215 of the two notches are both planar and parallel to each other; the adjusting shim 210 is C-shaped, the engaging hole 213 is circular, and the width of the inserting/extracting opening 214 is smaller than the diameter of the engaging hole 213. The adjustment washer 210 is rotatable about the stopper shaft 27.

The lower die 2 further comprises a lower shear template 216, the lower shear template 216 is mounted on the lower die body 22 and located above the lower die body 22, a lower shear die cavity 217 is formed in the lower shear template 216, and the lower shear die 23 is arranged in the lower shear die cavity 217.

In this embodiment, a leg-side forming copper sleeve 243 and a leg-bottom forming copper sleeve 244 are fixedly mounted on the inner side of the lower portion of the side mold 241, the leg-side forming copper sleeve 243 is stacked on the upper end surface of the leg-bottom forming copper sleeve 244, and the movable bottom mold 242 is located in the cavity of the leg-bottom forming copper sleeve 244. The inner side surface of the leg-side molding copper bush 243 and the annular portion of the upper end surface of the leg-bottom molding copper bush 244 located inside the leg-side molding copper bush 243 constitute a part of the molding cavity. Such a forming die 24 can be used to produce a container having feet at the bottom. The plastic sheet is tightly adhered to the inner side surface of the upper part of the side die 241 during molding, the inner side surface of the leg side molding copper sleeve 243, the annular part of the upper end surface of the leg bottom surface molding copper sleeve 244 at the inner side of the leg side molding copper sleeve 243, and the upper surface of the movable bottom die 242. When the movable bottom die 242 is lifted, the sheet attached to the upper surface of the movable bottom die is pushed to lift, and the sheet is overlapped and bonded with the sheet attached to the inner side surface of the leg side surface forming copper sleeve 243 to form the leg.

The leg-side-surface-forming copper bush 243 and the leg-bottom-surface-forming copper bush 244 are fixedly connected to the side form 241, and the leg-side-surface-forming copper bush 243 and the leg-bottom-surface-forming copper bush 244 are replaced together when the side form 241 is replaced.

The side molds 21 matched with the thermal forming mold have different heights; the respective shims 210 associated with the thermoforming mold have different thicknesses (i.e., heights). The number of shims 210 associated with the thermoforming mold is one less than the number of side forms 241 (the side form with the greatest height does not require an associated shim, as shown in FIG. 1). When supporting side forms and adjusting the gasket, the side forms correspond with adjusting the gasket and are in groups, can place the side forms of group and adjusting the gasket together (still can make the mark on side forms and adjusting the gasket for the discernment) so that operating personnel accurately takes.

When a plastic product with another specification needs to be produced, the original side die 241 is detached, and then another side die 241 is installed; and then, according to actual conditions, the adjusting gasket 210 is replaced, added or removed, so that the ejector rod mounting plate 26, the ejector rod 25 and the movable bottom die 242 can be positioned at the required height positions, and the die is modified.

The thermoforming mold of the present embodiment is provided with a plurality of stretching heads 18, each stretching head 18 is paired with a side mold 241, the shape and size of the stretching head 18 correspond to the corresponding side mold 21, and after the side mold 21 is replaced, the corresponding stretching head 18 can be replaced as needed. The stretching heads and corresponding sideforms may be placed together (and may also be marked on the sideforms and the adjustment pads for identification) for accurate access by the operator.

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 23 is a lower shear blade, and the lower shear blade is matched with the upper shear blade (the upper shear blade and the lower shear blade are both annular blades).

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 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 product 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, the lower die 2 rises at the moment, the thermoforming die is closed, the compression spring 17 applies downward thrust to the pressing ring 16, so that the pressing ring 16 presses the plastic sheet on the upper surface of the lower shearing die plate 23, and a forming air chamber is formed between the plastic sheet and the pressing ring 16; then introducing compressed gas into the forming air chamber, enabling the plastic sheet to be tightly attached to the forming die 24 under the action of the compressed air, and cooling and shaping the formed sheet; then the lower die 2 is further lifted (namely the upper die is further lowered relative to the lower die), the upper shear die 13 is matched with the lower shear die 23 to complete the punching action, and the plastic product is cut from the formed sheet material to obtain a single plastic product; then the lower die 2 descends, and the lower die 2 is separated from the upper die 1; subsequently, the ejector rod mounting plate 26 drives the ejector rod 25 and the movable bottom die 242 to ascend relative to the lower template 21, so as to eject the plastic product; then blowing air to the plastic product to blow the plastic product away from the thermoforming mold, thereby completing the one-time thermoforming process. Then, the lower mold 2 is raised, the movable bottom mold 242 is returned to a position required for molding (in the process that the ejector rod mounting plate 26 is lowered relative to the lower mold plate 21, when the lower surface of the ejector rod mounting plate 26 contacts the upper end surface of the lower limiting washer 29, the ejector rod mounting plate 26 is not lowered any more; in the process that the ejector rod mounting plate 26 is lowered relative to the lower mold plate 21 when the limiting shaft 27 is provided with the adjusting washer 210, when the lower surface of the ejector rod mounting plate 26 contacts the upper end surface of the adjusting washer 210, the ejector rod mounting plate 26 is not lowered any more), and the next thermal molding process is prepared.

Referring to fig. 1 and 3, in order to convert the thermoforming mold shown in fig. 1 into the thermoforming mold shown in fig. 1, the side mold 241-1 in fig. 1 is removed and then the side mold 241-2 in fig. 3 is installed, and the stretching head 18-1 in fig. 1 is removed and then the stretching head 18-2 in fig. 3 is installed, and the adjustment pad 210 is installed.

Referring to fig. 2, when the adjusting shim 210 needs to be installed, the ejector rod mounting plate 26 is lifted (at this time, the ejector rod 25 and the movable bottom die 242 are lifted along with the lifting), so that the ejector rod mounting plate 26 is higher than the inserting and extracting portion 212; then, two sides of the plugging port 214 of the adjusting gasket 210 are respectively aligned to the two notches 211, and the adjusting gasket 210 is moved transversely, so that the plugging part 212 enters the sleeving hole 213; then, the adjusting shim 210 is lowered along the limiting shaft 27 until the lower surface of the adjusting shim 210 contacts with the upper surface of the lower limiting washer 29; the ejector rod mounting plate 26 is then lowered until the ejector rod mounting plate 26 contacts the upper surface of the adjustment pad 210, at which time the movable die 242 is lowered to the position required for molding.

Referring to fig. 2, when the adjusting pad 210 needs to be removed, the ejector rod mounting plate 26 is lifted (at this time, the ejector rod 25 and the movable bottom die 242 are lifted along with the lifting), so that the ejector rod mounting plate 26 is higher than the inserting and extracting portion 212; then, the adjusting pad 210 is lifted to a position corresponding to the inserting and pulling part 212 along the limiting shaft 27; then, two sides of the inserting and pulling opening 214 of the adjusting gasket 210 are aligned to the two notches 211 respectively, and the adjusting gasket 210 is moved transversely to separate the inserting and pulling portion 212 from the sleeve hole 213, so that the adjusting gasket 210 can be taken down from the limit shaft 27.

In other embodiments, the forming mold includes a side mold, a leg folding jig and a movable bottom mold, the side mold, the leg mold and the leg folding jig are all in a ring shape, the leg folding jig is disposed inside the leg mold, the side mold is mounted on the lower mold body and is superposed above the leg mold, and the movable bottom mold is disposed inside the leg folding jig (the specific structure can refer to publication No. CN206254488U, entitled "a thermoforming mold for manufacturing a plastic container with ring-shaped legs"). In the thermoforming mold, the side molds are used for forming the side walls and the edge parts of the plastic container, the movable bottom mold is used for forming the bottom of the plastic container, and the supporting foot mold and the supporting foot folding and shaping mold are jointly used for forming the annular supporting foot. In the scheme, the lower die body and the lower shear die mounting plate are detachably mounted and can be provided with a plurality of side dies and lower die bodies (the height of the lower die body is matched with that of the corresponding side die), and each side die corresponds to one plastic container; the movable bottom die, the supporting foot die and the supporting foot folding and shaping die only need to be configured in one set and can be matched with each side die. When the hot forming die needs to be modified, the side die and the lower die body are replaced, and the adjusting gasket is correspondingly replaced, additionally installed or detached, so that the modification of the die can be quickly and conveniently completed, and the required plastic container can be produced. Such thermoforming molds may be used in the production of a variety of plastic containers (e.g., plastic cups, plastic bowls, plastic trays, etc., which typically have a uniform shape and size of the outer rim, a uniform shape and size of the container bottom and annular leg, and a different shape of the height and sidewall).

In other embodiments, the forming die includes only a sideform and a movable base die. The lower mold may further include a lower embossing mechanism (the specific structure may be referred to as "a thermoforming mold having an embossing function" under publication No. CN 207607102U).

Claims (6)

1. A thermal forming die with a rapid adjusting and limiting structure of an ejector rod comprises an upper die and a lower die; the upper die comprises an upper die plate, an upper die body and an upper shear die, the upper die body is arranged on the upper die plate and is positioned below the upper die plate, and the upper shear die is arranged on the upper die body and is positioned below the upper die body; the lower die comprises a lower die plate, a lower die body, a lower shear die, a forming die and an ejector rod, the lower die body is arranged on the lower die plate and is positioned above the lower die plate, the lower shear die is arranged on the lower die body and is positioned above the lower die body, the forming die comprises a side die and a movable bottom die, the side die is arranged on the lower die body and is positioned at the inner side of the lower shear die, the movable bottom die is arranged at the inner side of the side die and is connected with the upper end of the ejector rod, and the lower end of the ejector rod extends out of the lower part of the lower die plate and is connected with an ejector; be equipped with the spacing axle of upper and lower trend on the lower bolster, be equipped with spacing through-hole on the ejector pin mounting panel, spacing axle is in spacing through-hole, and spacing axle lower extreme has cup jointed down spacing packing ring, and spacing packing ring is in ejector pin mounting panel below, characterized by down: the hot forming die is provided with a plurality of side dies; the hot forming die also comprises at least one adjusting gasket which can be selectively arranged on the limiting shaft; the adjusting gasket is arranged between the ejector rod mounting plate and the lower limiting washer when mounted on the limiting shaft, and the lower surface of the adjusting gasket is in contact with the upper surface of the lower limiting washer.

2. The thermoforming mold of claim 1, wherein: the middle part of the limiting shaft is provided with two notches which are positioned at the same height position and are respectively positioned at two sides of the limiting shaft, and the part of the limiting shaft positioned between the two notches forms a plugging part; the central point of adjusting shim is equipped with the hole of cup jointing, cup joints the shape and the size and the spacing axle phase-match in hole, and adjusting shim one side is equipped with the plug mouth, the plug mouth with cup joint the hole intercommunication, the width of plug mouth and the width phase-match of plug portion, adjusting shim can cup joint at spacing epaxially.

3. The thermoforming mold of claim 2, wherein: the cross section of the limiting shaft is circular, and the bottoms of the two notches are both flat and parallel to each other; the adjusting gasket is C-shaped, the sleeving hole is circular, and the width of the plugging port is smaller than the diameter of the sleeving hole.

4. A thermoforming mould as claimed in any of claims 1 to 3, wherein: the upper die further comprises an upper shear template, the upper shear template is installed on the upper die body and located below the upper die body, an upper shear die accommodating cavity is formed in the upper shear template, and the upper shear die is arranged in the upper shear die accommodating cavity.

5. A thermoforming mould as claimed in any of claims 1 to 3, wherein: the lower die further comprises a lower shear template, the lower shear template is installed on the lower die body and located above the lower die body, a lower shear die containing cavity is formed in the lower shear template, and the lower shear die is arranged in the lower shear die containing cavity.

6. A thermoforming mould as claimed in any of claims 1 to 3, wherein: 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.

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