CN115320073A - Plastic suction mold and demolding method thereof - Google Patents
Plastic suction mold and demolding method thereof Download PDFInfo
- Publication number
- CN115320073A CN115320073A CN202211248761.XA CN202211248761A CN115320073A CN 115320073 A CN115320073 A CN 115320073A CN 202211248761 A CN202211248761 A CN 202211248761A CN 115320073 A CN115320073 A CN 115320073A
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- air
- air cavity
- sleeve
- template
- air pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/30—Moulds
- B29C51/36—Moulds specially adapted for vacuum forming, Manufacture thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/10—Forming by pressure difference, e.g. vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/42—Heating or cooling
- B29C51/428—Heating or cooling of moulds or mould parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/44—Removing or ejecting moulded articles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of plastic molding, in particular to a plastic suction mold which is used for plastic suction molding of a plastic plate and comprises a shell, a template, a base, an air pump assembly and an adjusting assembly, wherein the base, the template and the shell define a first air cavity; the plastic plate, the template and the shell define a second air cavity; the template is provided with a through hole for communicating the first air cavity with the second air cavity; the air pump assembly extracts air in the first air cavity to adsorb the plastic plate to be attached to the template; when the air pressure in the first air cavity is reduced to a first preset value, the adjusting assembly pushes the plastic entering the through hole upwards and blocks the through hole, so that the plastic is prevented from being sucked into the through hole to influence the forming quality of a plastic packaging product; the back air pump assembly injects cold air into the first air cavity, the adjusting assembly enables the first air cavity to be communicated with the second air cavity when the air pressure in the first air cavity rises to a second preset value, and the plastic plate is separated from the template under the action of the air pressure in the first air cavity, so that the appearance quality of the plastic packaging product is guaranteed.
Description
Technical Field
The invention relates to the technical field of plastic molding, in particular to a plastic suction mold and a demolding method thereof.
Background
The plastic product processing and forming process comprises extrusion, injection, calendaring, plastic suction and the like, wherein the plastic suction process comprises the steps of heating and softening a flat plastic plate, absorbing the plastic plate on the surface of a mold in a vacuum manner, and forming after cooling, and the process is mainly used for producing some packaging products such as trays, plastic suction boxes and the like.
For example, the invention patent with the publication number of CN113524534B discloses a plastic mold demolding device, which inserts a separation shovel sheet into a joint surface of a plastic plate and a mold, and then drives the mold to rotate under the action of a placing seat; the side wall of the plastic plate is separated from the mold through the separation shovel piece, the demolding mode inevitably contacts the plastic finished product, so that the plastic finished product is damaged, the process is complex, and the demolding efficiency and the demolding effect are influenced.
Disclosure of Invention
The invention provides a plastic suction mould and a demoulding method thereof, which aim to solve the problem of poor demoulding effect of the existing plastic mould.
The invention relates to a plastic suction mould and a demoulding method thereof, which adopt the following technical scheme:
a plastic suction mould is used for plastic suction forming of plastic plates after heating softening and comprises a shell, a template, a base, an air pump assembly and an adjusting assembly, wherein the template is fixed in the shell, the base is positioned below the template and defines a first air cavity with the template and the shell; the plastic plate is positioned above the template, and defines a second air cavity together with the template and the shell; the template is provided with a through hole for communicating the first air cavity with the second air cavity; the adjusting component is arranged in the through hole; the air pump assembly pumps the air in the first air cavity, the through hole and the second air cavity to reduce the internal air pressure, and the plastic plate is adsorbed to be attached to the template; when the air pressure in the first air cavity is reduced to a first preset value, the adjusting assembly pushes the plastic entering the through hole upwards and blocks the through hole; the back air pump assembly injects cold air into the first air cavity to enable the internal air pressure of the first air cavity to be increased, the cold air absorbs heat of the template to enable the internal air pressure of the first air cavity to be further increased, and the adjusting assembly enables the first air cavity to be communicated with the second air cavity when the internal air pressure of the first air cavity is increased to a second preset value, so that the plastic plate is separated from the template under the action of the internal air pressure of the first air cavity.
Further, the through hole comprises a first ring part and a second ring part, the first ring part is positioned above the second ring part, and the inner diameter of the first ring part is smaller than that of the second ring part; an elastic stop block is arranged on the inner wall of the second annular part of the through hole; the adjusting assembly comprises a first sleeve, a second sleeve and a limiting column, the diameter of the first sleeve is equal to the inner diameter of the first ring part, the diameter of the second sleeve is smaller than the inner diameter of the second ring part, the second sleeve is fixed on the base, and the first sleeve is sleeved on the outer part of the second sleeve in a sliding mode and defines a sealed third air cavity with the second sleeve; the limiting column is arranged on the first sleeve in a sliding mode along the radial direction of the first sleeve, the outer end of the limiting column extends out of the first sleeve, and the inner end of the limiting column is located in the third air cavity; in an initial state, the first sleeve and the second sleeve are both positioned below the first annular part, the air pressure in the third air cavity and the air pressure in the first air cavity are both a third preset value, the outer end of the limiting column extends out of the first sleeve and is abutted against the second annular part, and the limiting column is positioned below the elastic stop block; wherein the third preset value is greater than the first preset value; along with the reduction of the air pressure in the first air cavity, the first sleeve moves upwards or has a tendency of moving upwards under the action of the air pressure in the third air cavity until the air pressure in the first air cavity is reduced to a first preset value, and the limiting column crosses the elastic stop block to enable the first sleeve to move upwards to the first ring part under the action of the air pressure in the third air cavity, so that the plastic entering the first ring part is pushed and the through hole is blocked.
Furthermore, an avoiding groove is formed in the upper end of the second annular part, when the first sleeve moves upwards to be matched with the first annular part, the limiting column moves to the upper end of the second annular part along with the first sleeve and moves outwards under the action of air pressure in the first air cavity to be inserted into the avoiding groove, so that the first sleeve is prevented from moving downwards to cause the first annular part of the first sleeve to be disengaged, at the moment, the air pressure in the third air cavity is reduced to a fourth preset value, and the fourth preset value is smaller than the second preset value; along with the increase of the air pressure in the first air cavity, the first sleeve tends to move downwards under the air pressure of the first air cavity, and the limiting column tends to move in the first sleeve under the air pressure of the first air cavity; when the air pressure in the first air cavity rises to a second preset value, the limiting column moves inwards to be separated from the avoiding groove and retract into the first sleeve, the first sleeve is allowed to move downwards under the action of the air pressure in the first air cavity and the pressure of the air between the first sleeve and the plastic plate to be separated from the first ring part, and the limiting column moves to the position below the elastic stop block along with the first sleeve; the perforating hole communicates with the first air cavity and the second air cavity, the plastic plate is separated from the template under the air pressure of the first air cavity, the second air cavity is communicated with the outside, the air pressure of the first air cavity is recovered to a third preset value, and the limiting column extends out of the first sleeve under the air pressure of the third air cavity until the air pressure in the third air cavity rises to the third preset value.
Furthermore, the base can be installed in the shell in a vertically sliding mode, a transmission assembly is arranged between the base and the plastic plate, the transmission assembly enables the base to move up and down along with the change of the thickness of the plastic plate, and further the distance between the base and the template is increased along with the increase of the thickness of the plastic plate; the adjusting assembly further comprises a piston block and a top pressing block, a gas channel for communicating the inside and the outside of the first sleeve is arranged on the peripheral wall of the first sleeve, and the piston block can be installed in the gas channel in a vertically sliding mode and is in sliding sealing with the gas channel; the jacking block is positioned outside the first sleeve and below the limiting column, and moves up and down synchronously along with the piston block; when the air pressure of the piston block in the third air cavity is smaller than the air pressure in the first air cavity, the piston block drives the jacking block to move upwards to enable the jacking block to be abutted against the limiting column, so that the resistance of the limiting column to be separated from the avoiding groove and to be withdrawn into the first sleeve is increased; the thicker the plastic plate is, the larger the distance between the base and the template is, the larger the displacement of the first sleeve from the initial state to the matching state of the limiting column and the avoiding groove is, the smaller the fourth preset value is, the larger the air pressure difference between the third air cavity and the first air cavity is when the air pump assembly fills cold air into the first air cavity, the larger the jacking force of the jacking block on the limiting column is, and further the resetting time of the limiting column is prolonged, so that the heat absorption time of the cold air on the template is prolonged.
Furthermore, the transmission assembly comprises a pressing frame, a first rack, a gear and a second rack, the first rack and the second rack are both vertically arranged, the gear is rotatably arranged on the shell around a horizontal axis, and the gear is positioned between the first rack and the second rack and is respectively meshed with the first rack and the second rack; the edge pressing frame is detachably connected with the first rack and is positioned above the plastic plate; the second rack is fixedly connected with the base, a fixing piece is arranged between the base and the shell, and the base and the shell are fixed through the fixing piece when the base moves up and down to a determined position; the pressing frame drives the first rack to move downwards to the position where the pressing frame is attached to the plastic plate, the base is driven to move upwards through transmission of the gear and the second rack, and the thicker the plastic plate is, the smaller the downward movement displacement of the pressing frame is, and the smaller the upward movement displacement of the base is.
Further, the air pump assembly comprises a suction pump and an air supply pump, and the suction pump is used for pumping air in the first air cavity to reduce the air pressure in the first air cavity; the air supply pump is used for charging cold air into the first air cavity to increase the air pressure in the first air cavity.
Furthermore, the elastic stop block comprises a stop column and a spring, the inner wall of the second annular part is provided with an installation groove, the stop column is installed in the installation groove in a sliding manner along the radial direction of the second annular part, and the stop column extends into the second annular part under the pushing action of the spring so as to block the limiting column from moving upwards; one end of the bumping post extending out of the second ring portion is a ball head, and the bumping post moves in the pushing downward mounting groove of the limiting post moving upward.
A demoulding method, which utilizes the plastic suction mould, comprises the following steps:
s1: placing a plastic plate on the template, moving the edge pressing frame downwards until the edge pressing frame is attached to the plastic plate, fixing the plastic plate, moving the base upwards along with the edge pressing frame to a determined position, and fixing the base and the shell by using a fixing piece;
s2: heating and softening the plastic plate;
s3: starting a suction pump, adsorbing the plastic plate to be attached to the template until the first sleeve is matched with the first ring part and the limiting column is inserted into the avoidance groove, and closing the suction pump;
s4: disassembling the pressing frame;
s5: the air supply pump is started, cold air is filled into the first air cavity, the cold air absorbs heat of the template and expands to enable air pressure in the first air cavity to be increased, and after the first sleeve pipe is separated from the first ring portion, air in the first air cavity pushes the plastic plate from bottom to top through the through hole, so that the plastic plate is separated from the template;
s6: and installing the back pressure frame and loosening the fixing piece.
The invention has the beneficial effects that: the plastic suction mould utilizes the air pump assembly to extract the air in the first air cavity, the through hole and the second air cavity so as to reduce the internal air pressure, thereby adsorbing the plastic plate to be attached to the template; when the air pressure in the first air cavity is reduced to a first preset value, the adjusting assembly pushes the plastic entering the through hole upwards and blocks the through hole, so that the plastic plate is prevented from being sucked into the through hole to influence the forming quality of a plastic product; the rear air pump assembly injects cold air into the first air cavity to increase the internal air pressure of the first air cavity, the cold air absorbs heat of the template to further increase the air pressure in the first air cavity, and the adjusting assembly enables the first air cavity to be communicated with the second air cavity when the air pressure in the first air cavity is increased to a second preset value, so that the plastic plate is separated from the template under the action of the air pressure in the first air cavity; the plastic suction and the demoulding can be finished by pumping and charging air into the first air cavity, other auxiliary tools are not needed, and the working procedure is simplified; the plastic plate is pushed to be separated from the template by utilizing the air pressure in the first air cavity, so that the demolding efficiency is greatly improved; the plastic plate is separated from the template in a non-contact mode, and the appearance quality of the plastic packaging product is guaranteed.
Furthermore, the thicker the plastic plate is, the larger the distance between the base and the template is, the larger the displacement of the first sleeve from the initial state to the matching state of the limiting column and the avoiding groove is, the smaller the fourth preset value is, the larger the air pressure difference between the third air cavity and the first air cavity when the air pump assembly fills cold air into the first air cavity is, the larger the jacking force of the jacking block on the limiting column is, and further the resetting time of the limiting column is prolonged, so that the heat absorption time of the cold air on the template is prolonged, the second preset value is further increased, namely the limiting column can be moved inwards and the first sleeve can be moved downwards when the air pressure in the first air cavity is further increased, the plastic plate is fully cooled, and the pushing force of the air in the first air cavity on demolding of the plastic plate is also increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of the overall structure of a plastic suction mold according to an embodiment of the present invention;
FIG. 2 is a top view of the overall structure of the plastic suction mold according to the embodiment of the present invention;
FIG. 3 isbase:Sub>A sectional view taken along line A-A of FIG. 2;
FIG. 4 is an enlarged view of the point B in FIG. 3;
FIG. 5 is an enlarged view of the point C in FIG. 4;
FIG. 6 is a schematic view of a first sleeve structure in an embodiment of the blister mold of the invention;
FIG. 7 is a schematic diagram of a state in which a limiting column and an avoiding groove are matched in an embodiment of the plastic suction mold of the invention;
in the figure: 100. a housing; 110. a fixing member; 200. a template; 210. a through hole; 211. a first ring portion; 212. a second ring portion; 213. an avoidance groove; 214. mounting grooves; 220. an elastic stopper; 221. a bumping post; 222. a spring; 300. a base; 310. an air intake passage; 400. an air pump assembly; 410. a suction pump; 420. an air supply pump; 500. an adjustment assembly; 510. a first sleeve; 511. a gas channel; 520. a second sleeve; 530. a limiting column; 540. a piston block; 550. pressing the block; 600. a transmission assembly; 610. pressing the frame; 620. a first rack; 630. a gear; 640. a second rack.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
An embodiment of the plastic suction mold of the present invention is used for plastic suction molding of a plastic plate after being heated and softened, as shown in fig. 1 to 7, the plastic suction mold comprises a housing 100, a mold plate 200, a base 300, an air pump assembly 400 and an adjusting assembly 500,
the template 200 is fixed in the housing 100, and the base 300 is positioned below the template 200 and defines a first air cavity with the template 200 and the housing 100;
the plastic plate is positioned above the template 200 and defines a second air cavity together with the template 200 and the shell 100;
the template 200 is provided with a through hole 210 for communicating the first air cavity with the second air cavity;
the adjustment assembly 500 is mounted to the through hole 210;
the air pump assembly 400 pumps the air in the first air chamber, the through hole 210 and the second air chamber to reduce the internal air pressure, and adsorbs the plastic plate to be attached to the template 200; when the air pressure in the first air cavity is reduced to a first preset value, the adjusting assembly 500 pushes the plastic entering the through hole 210 upwards and seals the through hole 210, so that the plastic plate is prevented from being sucked into the through hole 210 to influence the forming quality; the rear air pump assembly 400 injects cold air into the first air cavity to increase the internal air pressure of the first air cavity, the cold air absorbs heat of the template 200 to further increase the internal air pressure of the first air cavity, and the adjusting assembly 500 enables the first air cavity to be communicated with the second air cavity when the internal air pressure of the first air cavity is increased to a second preset value, so that the plastic plate is separated from the template 200 under the action of the internal air pressure of the first air cavity.
In the present embodiment, the through hole 210 includes a first ring portion 211 and a second ring portion 212, the first ring portion 211 is located above the second ring portion 212, and the inner diameter of the first ring portion 211 is smaller than the inner diameter of the second ring portion 212; an elastic stopper 220 is arranged on the inner wall of the second ring part 212 of the through hole 210; the adjusting assembly 500 comprises a first sleeve 510, a second sleeve 520 and a limiting column 530, wherein the diameter of the first sleeve 510 is equal to the inner diameter of the first ring part 211, the diameter of the second sleeve 520 is smaller than the inner diameter of the second ring part 212, the second sleeve 520 is fixed on the base 300, the first sleeve 510 is slidably sleeved on the upper part of the outer part of the second sleeve 520 and defines a sealed third air cavity with the second sleeve 520, specifically, the lower end of the second sleeve 520 is sealed, the upper end of the first sleeve 510 is sealed, the lower end of the first sleeve 510 is slidably sealed with the upper end of the second sleeve 520 and defines the third air cavity in the first sleeve 510; the limit column 530 is arranged on the first sleeve 510 in a sliding manner along the radial direction of the first sleeve 510, the outer end of the limit column 530 extends out of the first sleeve 510, and the inner end of the limit column 530 is positioned in the third air cavity; in an initial state, the first sleeve 510 and the second sleeve 520 are both located below the first ring portion 211, and the air pressure in the third air cavity and the air pressure in the first air cavity are both a third preset value, wherein the third preset value can be an atmospheric pressure value, and the third preset value is greater than the first preset value, the outer end of the limiting column 530 extends out of the first sleeve 510 and abuts against the inner wall of the second ring portion 212, and the limiting column 530 is located below the elastic stop 220; along with the reduction of the air pressure in the first air cavity, the first sleeve 510 moves upward or has a tendency to move upward under the action of the air pressure in the third air cavity until the air pressure in the first air cavity is reduced to a first preset value, and the limit post 530 crosses the elastic stop block 220 to make the first sleeve 510 move upward to the first ring part 211 under the action of the air pressure in the third air cavity, so as to push the plastic entering the first ring part 211 and block the through hole 210.
In this embodiment, the avoiding groove 213 is disposed at the upper end of the second ring portion 212, when the first sleeve 510 moves upward to be matched with the first ring portion 211, the limiting column 530 moves to the upper end of the second ring portion 212 along with the first sleeve 510, and moves outward to be inserted into the avoiding groove 213 under the action of the air pressure in the first air cavity, so as to prevent the first sleeve 510 from moving downward to cause the first sleeve 510 to be disengaged from the first ring portion 211, at this time, the air pressure in the third air cavity is reduced to a fourth preset value, and the fourth preset value is smaller than the second preset value; as the air pressure in the first air cavity increases, the first sleeve 510 tends to move downward under the air pressure of the first air cavity, and the limiting column 530 tends to move inward of the first sleeve 510 under the air pressure of the first air cavity; when the air pressure in the first air cavity rises to a second preset value, the limiting column 530 moves inwards to be separated from the avoiding groove 213 and retract into the first sleeve 510, the first sleeve 510 is allowed to move downwards to be separated from the first ring part 211 under the action of the air pressure in the first air cavity and the pressure of the air between the first sleeve and the plastic plate, and the limiting column 530 moves to the position below the elastic stop 220 along with the first sleeve 510; the through hole 210 is communicated with the first air cavity and the second air cavity, the plastic plate is separated from the template 200 under the air pressure of the first air cavity, the second air cavity is communicated with the outside after the plastic plate is taken down, the air pressure of the first air cavity is recovered to a third preset value, and the limiting column 530 extends out of the first sleeve 510 under the air pressure of the third air cavity until the air pressure in the third air cavity is recovered to the third preset value.
In this embodiment, the base 300 is slidably installed in the housing 100 up and down, and the transmission assembly 600 is disposed between the base 300 and the plastic plate, the transmission assembly 600 enables the base 300 to move up and down along with the thickness change of the plastic plate, so that the distance between the base 300 and the mold plate 200 increases along with the thickness increase of the plastic plate; the adjusting assembly 500 further comprises a piston block 540 and a top pressure block 550, the peripheral wall of the first sleeve 510 is provided with an air passage 511 communicating the inside and the outside of the first sleeve 510, and the piston block 540 is slidably mounted on the air passage 511 up and down and is slidably sealed with the air passage 511; the top pressing block 550 is positioned outside the first sleeve 510 and below the limiting column 530, and the top pressing block 550 moves up and down synchronously along with the piston block 540; when the air pressure in the third air cavity is smaller than the air pressure in the first air cavity, the piston block 540 drives the jacking block 550 to move upwards, so that the jacking block 550 is abutted against the limiting column 530, and the resistance of the limiting column 530 separating from the avoiding groove 213 and withdrawing into the first sleeve 510 is increased. The thicker the plastic plate is, the larger the distance between the base 300 and the mold plate 200 is, the larger the displacement of the first sleeve 510 from the initial state to the state where the limiting column 530 is matched with the avoiding groove 213 is, the smaller the fourth preset value is, the larger the pressure difference between the third air cavity and the first air cavity when the air pump assembly 400 fills cold air into the first air cavity is, the larger the jacking force of the jacking block 550 on the limiting column 530 is, and further the resetting time of the limiting column 530 is prolonged, so that the heat absorption time of the cold air on the mold plate 200 is prolonged, the second preset value is further increased, that is, the limiting column 530 can be moved inwards and the first sleeve 510 can be moved downwards only when the air pressure in the first air cavity is further increased, so that the plastic plate is fully cooled, and the pushing force of the air in the first air cavity on demolding of the plastic plate is also increased. A pressure spring is arranged between the piston block 540 and the first sleeve 510, and the pressure spring is extruded when the piston block 540 moves upwards, and when the air pressures in the third air cavity and the first air cavity both return to a third preset value, the pressure spring and the air pressure in the third air cavity jointly urge the piston block 540 to move downwards to return to the initial position, so that the friction force between the top pressure block 550 and the limiting column 530 is reduced.
In this embodiment, the transmission assembly 600 includes a frame 610, a first rack 620, a gear 630 and a second rack 640, wherein the first rack 620 and the second rack 640 are both vertically disposed, the gear 630 is rotatably mounted to the housing 100 around a horizontal axis, and the gear 630 is located between the first rack 620 and the second rack 640 and is engaged with the first rack 620 and the second rack 640 respectively; the edge pressing frame 610 is detachably connected with the first rack 620, and the edge pressing frame 610 is positioned above the plastic plate; the second rack 640 is fixedly connected with the base 300, the fixing member 110 is arranged between the base 300 and the housing 100, the base 300 is fixed with the housing 100 through the fixing member 110 when the base 300 moves up and down to a certain position, specifically, the fixing member 110 is a bolt assembly, the bolt assembly is installed on the housing 100, and the base 300 is tightly pressed by the bolt assembly to fix the base 300 with the housing 100; the blank pressing frame 610 drives the first rack 620 to move downwards until the blank pressing frame 610 is attached to the plastic plate, the base 300 is driven to move upwards through the transmission of the gear 630 and the second rack 640, and the thicker the plastic plate is, the smaller the downward movement displacement of the blank pressing frame 610 is, and the smaller the upward movement displacement of the base 300 is.
In this embodiment, the air pump assembly 400 includes a suction pump 410 and an air pump 420, the suction pump 410 is used for pumping the air in the first air cavity to reduce the air pressure in the first air cavity; the air pump 420 is used for charging cold air into the first air cavity to increase the air pressure in the first air cavity. An air inlet passage 310 communicating with the first air chamber is provided in the susceptor 300, and the suction pump 410 and the air supply pump 420 are both communicated with the air inlet passage 310.
In this embodiment, the elastic stopper 220 includes a blocking pillar 221 and a spring 222, the inner wall of the second ring portion 212 is provided with a mounting groove 214, the blocking pillar 221 is slidably mounted in the mounting groove 214 along the radial direction of the second ring portion 212, and the blocking pillar 221 extends into the second ring portion 212 under the urging of the spring 222, so as to block the limiting pillar 530 from moving upward; one end of the stop pillar 221 extending out of the second ring portion 212 is a ball head, the stop pillar 221 moves in the mounting groove 214 downward under the pushing action of the upward movement of the limiting pillar 530, and the limiting pillar 530 moves upward under acceleration after passing over the stop pillar 221 so that the first sleeve 510 pushes the plastic plate entering the first ring portion 211 upward quickly.
When the plastic suction mold is used, a plastic plate is placed on the mold plate 200, the pressing frame 610 is moved downwards until the pressing frame 610 is attached to the plastic plate, the plastic plate is fixed, the base 300 moves upwards along with the pressing frame 610 to a determined position, and the base 300 is fixed with the shell 100 by the fixing piece 110; at this time, the first air cavity and the second air cavity are communicated through the through hole 210, the air pressures in the first air cavity and the third air cavity are both a third preset value, one end of the limiting column 530 extending out of the first sleeve 510 abuts against the inner wall of the second annular portion 212, and the limiting column 530 is located below the elastic stopper 220. After the plastic plate is heated and softened, the suction pump 410 is started to pump the gas in the first air cavity, the through hole 210 and the second air cavity, so that the internal air pressure is reduced, and the plastic plate is adsorbed to be attached to the template 200; and along with the reduction of the air pressure in the first air cavity, the first sleeve 510 moves upwards or has a trend of moving upwards under the action of the air pressure in the third air cavity, and the limit column 530 has a trend of moving outwards under the action of the air pressure in the third air cavity until the air pressure in the first air cavity is reduced to a first preset value, the first sleeve 510 drives the limit column 530 to move upwards with acceleration after crossing the elastic stop block 220, the first sleeve 510 moves upwards to the first ring part 211 under the action of the air pressure in the third air cavity, pushes the plastic entering the first ring part 211 and blocks the through hole 210, and meanwhile, the limit column 530 and the avoidance groove 213 cooperate to block the first sleeve 510 from moving downwards. Then, the suction pump 410 is closed, the edge pressing frame 610 is detached, the air supply pump 420 is started, cold air is filled into the first air cavity to enable the air pressure in the first air cavity to be increased, the cold air absorbs heat of the template 200 and then expands to enable the air pressure in the first air cavity to be further increased, the first sleeve 510 tends to move downwards under the air pressure of the first air cavity along with the increase of the air pressure in the first air cavity, and the limiting column 530 tends to move inwards in the first sleeve 510 under the air pressure of the first air cavity; when the air pressure in the first air cavity rises to a second preset value, the limiting column 530 moves inwards to be separated from the avoiding groove 213 and retract into the first sleeve 510, the first sleeve 510 moves downwards under the action of the air pressure in the first air cavity and the pressure of the air between the first sleeve 510 and the plastic plate to be separated from the first ring part 211, and the limiting column 530 moves to the position below the elastic stop block 220 along with the first sleeve 510; at this time, the through hole 210 communicates the first air chamber and the second air chamber, the plastic panel is separated from the mold plate 200 under the air pressure of the first air chamber, the second air chamber is communicated with the outside after the plastic panel is taken down, so that the air pressure of the first air chamber is restored to a third preset value, and the limiting column 530 extends out of the first sleeve 510 under the air pressure of the third air chamber until the air pressure in the third air chamber is restored to the third preset value.
The larger the thickness of the plastic plate is, the smaller the downward movement displacement of the edge pressing frame 610 is, the smaller the upward movement displacement of the base 300 under the transmission of the first rack 620, the gear 630 and the second rack 640 is, the larger the distance between the base 300 and the template 200 is, the larger the displacement of the first sleeve 510 from the initial state to the state where the limiting column 530 is matched with the avoidance groove 213 is, the smaller the fourth preset value is, the larger the pressure difference between the third air cavity and the first air cavity when the air pump assembly 400 fills cold air into the first air cavity is, the larger the top pressure of the top pressing block 550 on the limiting column 530 is, and the longer the resetting time of the limiting column 530 is further extended, so that the heat absorption time of the cold air on the template 200 is further extended, that the second preset value is further increased, that the limit column 530 can be moved inward and the first sleeve 510 can be moved downward only when the air pressure in the first air cavity is further increased, the plastic plate is fully cooled, and the pushing force of the gas in the first air cavity on the plastic plate is also increased.
The invention discloses a demoulding method, which utilizes the plastic suction mould and comprises the following steps:
s1: placing a plastic plate on the template 200, moving the pressing frame 610 downwards until the pressing frame 610 is attached to the plastic plate, fixing the plastic plate, moving the base 300 upwards along with the pressing frame 610 to a determined position, and fixing the base 300 and the shell 100 by using the fixing piece 110;
s2: heating and softening the plastic plate;
s3: starting the suction pump 410, sucking the plastic plate to be attached to the template 200 until the first sleeve 510 is matched with the first ring part 211 and the limiting column 530 is inserted into the avoiding groove 213, and closing the suction pump 410;
s4: removing the press rim 610;
s5: the air supply pump 420 is started, cold air is filled into the first air cavity, the cold air absorbs heat of the template 200 and expands to raise air pressure in the first air cavity, and after the first sleeve 510 is separated from the first ring part 211, the air in the first air cavity pushes the plastic plate from bottom to top through the through hole 210, so that the plastic plate is separated from the template 200;
s6: the frame 610 is pressed back and the fixing member 110 is released.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The utility model provides a plastic suction mould for to the plastic board plastic suction shaping after the heat softening, its characterized in that: the air pump module comprises a shell, a template, a base, an air pump module and an adjusting module, wherein the template is fixed in the shell, and the base is positioned below the template and defines a first air cavity with the template and the shell; the plastic plate is positioned above the template, and defines a second air cavity together with the template and the shell; the template is provided with a through hole for communicating the first air cavity with the second air cavity; the adjusting component is arranged in the through hole; the air pump assembly pumps the air in the first air cavity, the through hole and the second air cavity to reduce the internal air pressure, and adsorbs the plastic plate to be attached to the template; when the air pressure in the first air cavity is reduced to a first preset value, the adjusting assembly pushes the plastic entering the through hole upwards and blocks the through hole; the back air pump assembly injects cold air into the first air cavity to enable the internal air pressure of the first air cavity to be increased, the cold air absorbs heat of the template to enable the air pressure in the first air cavity to be further increased, and the adjusting assembly enables the first air cavity to be communicated with the second air cavity when the air pressure in the first air cavity is increased to a second preset value, so that the plastic plate is separated from the template under the action of the air pressure in the first air cavity.
2. The plastic suction mold of claim 1, wherein: the through hole comprises a first ring part and a second ring part, the first ring part is positioned above the second ring part, and the inner diameter of the first ring part is smaller than that of the second ring part; an elastic stop block is arranged on the inner wall of the second ring part of the through hole; the adjusting assembly comprises a first sleeve, a second sleeve and a limiting column, the diameter of the first sleeve is equal to the inner diameter of the first ring part, the diameter of the second sleeve is smaller than the inner diameter of the second ring part, the second sleeve is fixed on the base, and the first sleeve is sleeved on the outer part of the second sleeve in a sliding mode and defines a sealed third air cavity with the second sleeve; the limiting column is arranged on the first sleeve in a sliding mode along the radial direction of the first sleeve, the outer end of the limiting column extends out of the first sleeve, and the inner end of the limiting column is located in the third air cavity; in an initial state, the first sleeve and the second sleeve are both positioned below the first ring part, the air pressure in the third air cavity and the air pressure in the first air cavity are both a third preset value, the outer end of the limiting column extends out of the first sleeve and is abutted against the second ring part, and the limiting column is positioned below the elastic stop block; wherein the third preset value is greater than the first preset value; along with the reduction of the air pressure in the first air cavity, the first sleeve pipe moves upwards or has the trend of moving upwards under the action of the air pressure in the third air cavity, and when the air pressure in the first air cavity is reduced to a first preset value, the limiting column crosses the elastic stop block to enable the first sleeve pipe to move upwards to the first ring part under the action of the air pressure in the third air cavity, so that the plastic entering the first ring part is pushed and the through hole is blocked.
3. The blister mold according to claim 2, wherein: when the first sleeve moves upwards to be matched with the first ring part, the limiting column moves to the upper end of the second ring part along with the first sleeve and moves outwards under the action of air pressure in the first air cavity to be inserted into the avoiding groove, so that the first sleeve is prevented from moving downwards to cause the first ring part of the first sleeve to be disengaged, at the moment, the air pressure in the third air cavity is reduced to a fourth preset value, and the fourth preset value is smaller than the second preset value; along with the increase of the air pressure in the first air cavity, the first sleeve tends to move downwards under the air pressure of the first air cavity, and the limiting column tends to move in the first sleeve under the air pressure of the first air cavity; when the air pressure in the first air cavity rises to a second preset value, the limiting column moves inwards to be separated from the avoiding groove and retract into the first sleeve, the first sleeve is allowed to move downwards under the action of the air pressure in the first air cavity and the pressure of the air between the first sleeve and the plastic plate to be separated from the first ring part, and the limiting column moves to the position below the elastic stop block along with the first sleeve; the through hole is communicated with the first air cavity and the second air cavity, the plastic plate is separated from the template under the air pressure of the first air cavity, the second air cavity is communicated with the outside, the air pressure of the first air cavity is recovered to a third preset value, and the limiting column extends out of the first sleeve under the air pressure of the third air cavity until the air pressure in the third air cavity rises to the third preset value.
4. The blister mold according to claim 3, wherein: the base can be installed in the shell in a vertically sliding mode, a transmission assembly is arranged between the base and the plastic plate, the transmission assembly enables the base to move up and down along with the change of the thickness of the plastic plate, and further the distance between the base and the template is increased along with the increase of the thickness of the plastic plate; the adjusting assembly further comprises a piston block and a top pressing block, a gas channel for communicating the inside and the outside of the first sleeve is arranged on the peripheral wall of the first sleeve, and the piston block can be installed in the gas channel in a vertically sliding mode and is in sliding sealing with the gas channel; the jacking block is positioned outside the first sleeve and below the limiting column, and moves up and down synchronously along with the piston block; when the air pressure of the piston block in the third air cavity is smaller than the air pressure in the first air cavity, the piston block drives the top pressing block to move upwards so that the top pressing block is abutted against the limiting column, and the resistance of the limiting column which is separated from the avoiding groove and withdraws into the first sleeve is increased; the thicker the plastic plate is, the larger the distance between the base and the template is, the larger the displacement of the first sleeve from the initial state to the matching state of the limiting column and the avoiding groove is, the smaller the fourth preset value is, the larger the air pressure difference between the third air cavity and the first air cavity is when the air pump assembly fills cold air into the first air cavity, the larger the jacking force of the jacking block on the limiting column is, and further the resetting time of the limiting column is prolonged, so that the heat absorption time of the cold air on the template is prolonged.
5. The plastic suction mold of claim 4, wherein: the transmission assembly comprises a frame pressing frame, a first rack, a gear and a second rack, the first rack and the second rack are both vertically arranged, the gear is rotatably arranged on the shell around a horizontal axis, and the gear is positioned between the first rack and the second rack and is respectively meshed with the first rack and the second rack; the edge pressing frame is detachably connected with the first rack and is positioned above the plastic plate; the second rack is fixedly connected with the base, a fixing piece is arranged between the base and the shell, and the base and the shell are fixed through the fixing piece when the base moves up and down to a determined position; the edge pressing frame drives the first rack to move downwards to be attached to the plastic plate, the base is driven to move upwards through the transmission of the gear and the second rack, and the thicker the plastic plate is, the smaller the downward movement displacement of the edge pressing frame is, and the smaller the upward movement displacement of the base is.
6. The plastic suction mold of claim 5, wherein: the air pump assembly comprises a suction pump and an air supply pump, and the suction pump is used for pumping air in the first air cavity to reduce the air pressure in the first air cavity; the air supply pump is used for charging cold air into the first air cavity to increase the air pressure in the first air cavity.
7. The plastic suction mold of claim 2, wherein: the elastic stop block comprises a stop column and a spring, the inner wall of the second annular part is provided with an installation groove, the stop column is installed in the installation groove in a sliding mode along the radial direction of the second annular part, and the stop column extends into the second annular part under the pushing action of the spring so as to block the limiting column from moving upwards; one end of the bumping post extending out of the second ring portion is a ball head, and the bumping post moves in the pushing downward mounting groove of the limiting post moving upward.
8. A mold release method using the plastic suction mold according to claim 6, characterized in that: the method comprises the following steps:
s1: placing a plastic plate on a template, moving the edge pressing frame downwards until the edge pressing frame is attached to the plastic plate, fixing the plastic plate, moving the base upwards to a determined position along with the edge pressing frame, and fixing the base and the shell by using a fixing piece;
s2: heating and softening the plastic plate;
s3: starting a suction pump, adsorbing the plastic plate to be attached to the template until the first sleeve is matched with the first ring part and the limiting column is inserted into the avoidance groove, and closing the suction pump;
s4: disassembling the pressing frame;
s5: the air supply pump is started, cold air is filled into the first air cavity, the cold air absorbs heat of the template and expands to enable air pressure in the first air cavity to be increased, and after the first sleeve pipe is separated from the first ring portion, air in the first air cavity pushes the plastic plate from bottom to top through the through hole, so that the plastic plate is separated from the template;
s6: and installing the back pressure frame and loosening the fixing piece.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211248761.XA CN115320073B (en) | 2022-10-12 | 2022-10-12 | Plastic suction mold and demolding method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211248761.XA CN115320073B (en) | 2022-10-12 | 2022-10-12 | Plastic suction mold and demolding method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103302813A (en) * | 2013-06-20 | 2013-09-18 | 钟灿秋 | Negative pressure injection molding mold of plastic product and method thereof |
| CN106114989A (en) * | 2016-08-05 | 2016-11-16 | 安庆博美塑业有限公司 | A kind of plastic sucking mechanism of plastic packing box system |
| CN206520200U (en) * | 2017-01-13 | 2017-09-26 | 芜湖恒信汽车内饰制造有限公司 | A kind of injection mold mould emptier |
| CN208881154U (en) * | 2018-10-01 | 2019-05-21 | 广州市东荣塑料制品有限公司 | A kind of pressure-vaccum integral type plastics sucking moulding device |
| CN210436605U (en) * | 2019-08-21 | 2020-05-01 | 吴江绿成塑料包装厂 | Plastic sucking disc mould |
-
2022
- 2022-10-12 CN CN202211248761.XA patent/CN115320073B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103302813A (en) * | 2013-06-20 | 2013-09-18 | 钟灿秋 | Negative pressure injection molding mold of plastic product and method thereof |
| CN106114989A (en) * | 2016-08-05 | 2016-11-16 | 安庆博美塑业有限公司 | A kind of plastic sucking mechanism of plastic packing box system |
| CN206520200U (en) * | 2017-01-13 | 2017-09-26 | 芜湖恒信汽车内饰制造有限公司 | A kind of injection mold mould emptier |
| CN208881154U (en) * | 2018-10-01 | 2019-05-21 | 广州市东荣塑料制品有限公司 | A kind of pressure-vaccum integral type plastics sucking moulding device |
| CN210436605U (en) * | 2019-08-21 | 2020-05-01 | 吴江绿成塑料包装厂 | Plastic sucking disc mould |
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| CN115320073B (en) | 2022-12-30 |
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