CN113927876A - Plastic blow molding machine with uniform thickness of finished product and plastic blow molding method - Google Patents
Plastic blow molding machine with uniform thickness of finished product and plastic blow molding method Download PDFInfo
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- CN113927876A CN113927876A CN202111206217.4A CN202111206217A CN113927876A CN 113927876 A CN113927876 A CN 113927876A CN 202111206217 A CN202111206217 A CN 202111206217A CN 113927876 A CN113927876 A CN 113927876A
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- 239000004033 plastic Substances 0.000 title claims abstract description 50
- 229920003023 plastic Polymers 0.000 title claims abstract description 50
- 238000000071 blow moulding Methods 0.000 title claims abstract description 44
- 239000007788 liquid Substances 0.000 claims abstract description 67
- 238000007664 blowing Methods 0.000 claims abstract description 49
- 238000001816 cooling Methods 0.000 claims abstract description 49
- 238000001125 extrusion Methods 0.000 claims abstract description 24
- 239000000110 cooling liquid Substances 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims abstract description 6
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 238000004891 communication Methods 0.000 claims description 60
- 238000000034 method Methods 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 description 6
- 239000002826 coolant Substances 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 3
- 239000012809 cooling fluid Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/28—Blow-moulding apparatus
- B29C49/30—Blow-moulding apparatus having movable moulds or mould parts
- B29C49/36—Blow-moulding apparatus having movable moulds or mould parts rotatable about one axis
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention provides a plastic blow molding machine with uniform thickness of finished products and a plastic blow molding method, which relate to the technical field of plastic blow molding equipment and aim to solve the technical problem of non-uniform wall thickness of the existing blow molding products; the plastic blow molding machine comprises a base, an extrusion assembly, a blowing assembly and a molding assembly, wherein the extrusion assembly, the blowing assembly and the molding assembly are arranged on the base; the die units are arranged on the mounting rack at intervals and can move to the lower parts of the extrusion assembly and the air blowing assembly in sequence along with the rotation of the mounting rack; the cooling assembly comprises a pump body and a connecting block; the connecting block is fixedly arranged on the base and is abutted against the central body; and a cooling channel is arranged between the connecting block and each mould unit, the cooling channel is provided with a liquid inlet and a liquid outlet, and the pump body is used for pumping cooling liquid from the liquid inlet to the liquid outlet. The wall thickness of the finished product of the plastic blow molding machine is uniform.
Description
Technical Field
The invention relates to the technical field of plastic blow molding equipment, in particular to a plastic blow molding machine with uniform thickness of finished products and a plastic blow molding method.
Background
In the plastic blow molding, after liquid plastic is extruded by equipment, a plastic body is blown to a mold cavity with a certain shape by utilizing the wind power blown out by a machine, so that a product is manufactured.
The existing plastic blow molding process generally comprises extruding a tubular parison by an extruder, putting the parison into a mold while the parison is hot, introducing compressed air for inflation to enable the parison to reach a mold cavity shape, and cooling and shaping to obtain a finished product.
However, the current plastic blow molding machine has poor shaping effect, resulting in uneven thickness of the finished product.
Disclosure of Invention
Therefore, the invention provides a plastic blow molding machine with uniform finished product thickness and a plastic blow molding method, which aim to solve the technical problem of non-uniform finished product thickness of the existing plastic blow molding.
The technical scheme of the invention is as follows:
in a first aspect, the invention provides a plastic blow molding machine with uniform thickness of finished products, which comprises a base, an extrusion assembly and a blowing assembly, wherein the extrusion assembly and the blowing assembly are respectively arranged on the base;
the mounting frame comprises a central body, a ring-shaped piece and a plurality of connecting rods, wherein the ring-shaped piece is sleeved on the central body, and each connecting rod is connected between the central body and the ring-shaped piece;
the driving device is connected with the central body and can drive the central body to rotate;
the die units are arranged on the mounting rack at intervals and can move to the positions below the extrusion assembly and the air blowing assembly in sequence along with the rotation of the mounting rack;
the cooling assembly comprises a pump body and a connecting block; the connecting block is fixedly arranged on the base and is abutted against the central body;
and a cooling channel is arranged between the connecting block and each mould unit, the cooling channel is provided with a liquid inlet and a liquid outlet, and the pump body is used for pumping cooling liquid from the liquid inlet to the liquid outlet.
Furthermore, a liquid inlet hole and a liquid outlet hole are formed in the connecting block, and the liquid inlet hole and the liquid outlet hole penetrate through the connecting block; the liquid inlet is formed by the liquid inlet hole, the liquid outlet is formed by the liquid outlet hole, and the output end of the pump body is communicated with the liquid inlet.
Furthermore, a first annular groove and a second annular groove are arranged on the side face, abutted against the connecting block, of the central body, the first annular groove and the second annular groove are arranged at intervals, the first annular groove is opposite to the liquid inlet hole, and the second annular groove is opposite to the liquid outlet hole.
Further, the cooling passage includes a first communication hole, a second communication hole, a third communication hole, a fourth communication hole, and a fifth communication hole;
the first communicating hole is arranged on the central body and communicated with the first annular groove;
the second communication hole is arranged on one of the connecting rods and is communicated with the first communication hole;
the third communication holes are formed in the annular piece and are arranged at intervals, and the third communication holes at the head end are communicated with the second communication holes;
the fourth communication hole is formed in the die unit and is communicated with two adjacent third communication holes;
the fifth communication hole is formed in the other of the connecting rods, one end of the fifth communication hole is communicated with the third communication hole at the tail end, and the other end of the fifth communication hole is communicated with the second annular groove.
Further, the mold unit comprises a base, and a first mold and a second mold which are respectively slidably arranged on the base;
the fourth communication hole comprises an input section arranged on the base, cooling cavities respectively arranged on the first die and the second die, and an output section arranged on the base;
the input end of each cooling cavity is connected with the input section through a corrugated pipe, and the output end of each cooling cavity is connected with the output section through a corrugated pipe.
Furthermore, the connecting rods correspond to the die units one by one; the cooling channel comprises a liquid inlet channel from the connecting block to the die unit through the connecting rod, and a liquid discharge channel from the die unit to the connecting block through the same connecting rod.
Further, the air blowing assembly comprises an air blowing pipe, and the air blowing pipe is provided with an air blowing end capable of extending into the mold unit;
the air blowing device is characterized in that an air equalizing unit is arranged on the air blowing end, a mounting blind hole is formed in the air equalizing unit, the mounting blind hole comprises a sleeving section sleeved on the air blowing end and an air equalizing section which is connected in series with the sleeving section and located below the air blowing pipe, and a plurality of air holes are formed in the bottom surface of the mounting blind hole and the side surface of the air equalizing section respectively.
Further, the gas equalizing unit comprises a body and a buffer piece, and the buffer piece is sleeved on the body;
each air hole comprises a straight hole section and an inclined hole section, the straight hole section is arranged on the body, and the inclined hole section is arranged on the buffer piece and connected with the straight hole section.
Furthermore, the air holes are arranged in pairs, and the inclined hole sections of the two air holes in each pair are arranged oppositely.
In a second aspect, the present invention provides a method for blow molding plastic with uniform thickness of finished product, which applies the plastic blow molding machine with uniform thickness of finished product, and comprises the following steps:
starting a driving device, driving the central body and the mounting frame to rotate by the driving device, and sequentially moving each die unit to the lower parts of the extrusion assembly and the blowing assembly;
forming the product in a die unit by an extrusion assembly and a blowing assembly;
and detecting the temperature of the die unit, and if the temperature of the die unit is greater than a preset temperature threshold value, starting the pump body and inputting cooling liquid into the liquid inlet from the pump body.
The working principle and the beneficial effects of the invention are as follows:
the plastic blow molding machine and the plastic blow molding method with uniform thickness of finished products provided by the invention have the advantages that the mounting frames driven by the driving device to rotate are arranged, the mold units are arranged on the mounting frames, and each mold unit is driven by the mounting frame to move below the extrusion assembly and the blowing assembly in sequence; after one finished product is formed, the next finished product can be produced by moving the other die to the position below the extrusion assembly and the air blowing assembly without waiting for the cooling and shaping of the current finished product, so that the production efficiency is higher; and through setting up cooling unit, cool off for each mould unit by the coolant liquid, can shorten the time of finished product cooling design to can reduce the plastics flow in the cooling design time and the finished product thickness that leads to is uneven.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a front view of a plastic blow molding machine according to one embodiment of the present invention;
fig. 2 is a top view of a mounting frame according to an embodiment of the present invention;
FIG. 3 is a schematic view of the connection block and the central body according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a front view of a mold unit provided in accordance with one embodiment of the present invention;
FIG. 5 is a top view of a mold unit according to one embodiment of the present invention;
FIG. 6 is a schematic diagram of the combination of the air equalizing unit and the air blowing pipe according to the first embodiment of the present invention;
fig. 7 is a partial enlarged view of a portion a in fig. 6.
In the figure: 100-extrusion component, 200-blowing component, 210-blowing pipe, 220-gas homogenizing unit, 221-body, 222-buffer component, 223-gas hole, 2231-straight hole segment, 2232-inclined hole segment, 300-forming component, 310-driving device, 320-mounting frame, 321-central body, 3211-first annular groove, 3212-second annular groove, 322-annular piece, 323-connecting rod, 330-die unit, 331-base, 332-first die, 333-second die, 410-pump body, 420-connecting block, 421-liquid inlet hole, 422-liquid outlet hole, 510-first connecting hole, 520-second connecting hole, 530-third connecting hole, 541-input end and 542-output end, 543-bellows, 544-via, 550-fifth communication hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 derived by a person skilled in the art from the embodiments given herein without making any inventive step, are intended to be within the scope of the present invention.
Example one
The present embodiment provides a plastic blow molding machine having a uniform finished product thickness, as shown in fig. 1 to 4, including a base, an extrusion assembly 100, a blowing assembly 200, and a molding assembly 300. Wherein, the extrusion assembly 100 and the blowing assembly 200 are respectively disposed on the base, and the molding assembly 300 includes a driving device 310, a mounting frame 320, a cooling assembly and a plurality of mold units 330.
The mounting frame 320 includes a central body 321, a ring member 322, and a plurality of connecting rods 323; the central body 321 is rotatably arranged on the base, the ring-shaped member 322 is sleeved on the central body 321, and each connecting rod 323 is connected between the central body 321 and the ring-shaped member 322; the driving device 310 is connected to the central body 321 and can drive the central body 321 to rotate; the die units 330 are arranged on the mounting rack 320 at intervals and can move to the lower parts of the extrusion assembly 100 and the blowing assembly 200 in sequence along with the rotation of the mounting rack 320; the cooling assembly includes a pump body 410 and a connecting block 420; the connecting block 420 is fixed on the base and is abutted with the central body 321; a cooling channel is arranged between the connecting block 420 and each mold unit 330, the cooling channel has a liquid inlet and a liquid outlet, and the pump body 410 is used for pumping cooling liquid from the liquid inlet to the liquid outlet.
That is, the mounting frame 320 of the embodiment includes a central body 321 and a ring member 322 that are nested inside and outside and are fixedly connected to each other, when the driving device 310 drives the central body 321 to rotate, the ring member 322 can also rotate, and the rotation of the ring member 322 drives the mold units 330 on the ring member 322 to sequentially move to the lower portions of the extrusion assembly 100 and the blowing assembly 200, so that the extrusion assembly 100 and the blowing assembly 200 can perform the forming of the finished product in the mold units 330 below.
The fixed connecting block 420, the rotating central body 321, the annular member 322, and the mold unit 330 on the annular member 322 are connected to each other by a cooling channel, so that the cooling fluid can be supplied from the external pump body 410 to the cooling channel to cool the mold unit 330 by the cooling fluid.
In the plastic blow molding machine provided by the present embodiment, on one hand, by providing the mounting rack 320 driven by the driving device 310 to rotate, and the mold units 330 are provided in a plurality on the mounting rack 320, each mold unit 330 is driven by the mounting rack 320 to be sequentially movable to the lower side of the extrusion assembly 100 and the blowing assembly 200; after one finished product is formed, the next finished product can be produced by moving the other die to the position below the extrusion assembly 100 and the air blowing assembly 200 without waiting for the cooling and shaping of the current finished product, so that the production efficiency is higher; and through setting up cooling unit, cool off for each mould unit 330 by the coolant liquid, can shorten the time that the finished product cooled off the design to can reduce the plastics flow in the cooling design time, thereby improve the homogeneity of plastics finished product thickness.
In a specific structure, referring to fig. 3, in this embodiment, a liquid inlet hole 421 and a liquid outlet hole 422 are provided on the connecting block 420, and the liquid inlet hole 421 and the liquid outlet hole 422 penetrate through the connecting block 420; the liquid inlet hole 421 constitutes a liquid inlet, the liquid outlet hole 422 constitutes a liquid outlet, and the output end 542 of the pump body 410 is communicated with the liquid inlet.
Referring to fig. 3, a first annular groove 3211 and a second annular groove 3212 are provided on a side surface of the central body 321 abutting against the connecting block 420, the first annular groove 3211 and the second annular groove 3212 are arranged at intervals, the first annular groove 3211 is opposite to the liquid inlet hole 421, and the second annular groove 3212 is opposite to the liquid outlet hole 422. Wherein, the first annular grooves 3211 are opposite to the liquid inlet hole 421, that is, when the central body 321 rotates to any position, the first annular grooves 3211 are communicated with the liquid inlet hole 421; the second annular groove 3212 is opposite the drainage aperture 422, meaning that the second annular groove 3212 communicates with the drainage aperture 422 when the central body 321 is rotated to either position. In this embodiment, the second annular groove 3212 is sleeved on the first annular groove 3211, and a depth of the second annular groove 3212 is smaller than a depth of the first annular groove 3211.
Referring to fig. 2 to 5, the above-described cooling passage includes a first communication hole 510, a second communication hole 520, a third communication hole 530, a fourth communication hole, and a fifth communication hole 550; wherein, the first communicating hole 510 is disposed on the central body 321 and communicates with the first annular groove 3211; the second communication hole 520 is provided on one of the connection rods 323 and communicates with the first communication hole 510; the third communication holes 530 are arranged on the annular member 322, the third communication holes 530 are arranged at intervals, and the first end third communication hole 530 is communicated with the second communication hole 520; the fourth communication hole is provided in the die unit 330 and communicates with two adjacent third communication holes 530; the fifth communication hole 550 is provided on the central body 321 and the other of the connecting rods 323, and one end of the fifth communication hole 550 communicates with the final third communication hole 530 and the other end of the fifth communication hole 550 communicates with the second annular groove 3212.
Therefore, as shown in fig. 2 to 5, the coolant fed into the pump body 410 through the liquid inlet hole 421 can enter the first annular groove 3211, and then sequentially flows out through the first communicating hole 510, the second communicating hole 520, the third communicating holes 530, the fourth communicating holes, the fifth communicating hole 550, the second annular groove 3212, and the liquid outlet hole 422, that is, the coolant can take away heat of each mold unit 330, thereby reducing the temperature of the mold units 330, shortening the time of cooling and shaping the finished product, reducing plastic flow during cooling and shaping the finished product, and improving the uniformity of the wall thickness of the finished product.
In this embodiment, referring to fig. 2, 4 and 5, the mold unit 330 includes a base 331, and a first mold 332 and a second mold 333 slidably disposed on the base 331, respectively; the fourth communication hole includes an input section provided on the base 331, cooling cavities provided on the first die 332 and the second die 333, respectively, and an output section provided on the base 331; the input end 541 and the input section of each cooling chamber are connected by a bellows 543, and the output end 542 and the output section of each cooling chamber are connected by a bellows 543.
Specifically, when a finished product is produced, a tubular parison is extruded by an extrusion unit, moved toward each other by a first die 332 and a second die 333 to pick up the parison, and blown into the parison by a blow unit to expand the parison so as to abut against the wall surfaces of the first die 332 and the second die 333.
The present embodiment provides a structure capable of maintaining the communication of the fourth communication hole when the first mold 332 slides, and specifically, as shown in fig. 4 and 5, the input stage is provided on the base 331, the input stage is communicated with the third communication hole 530, and the base 331 is provided with a through hole 544 communicated with the third communication hole 530 and penetrating the base 331 upward; one end of the cooling chamber is connected to the through hole 544 through the bellows 543, so that the communication between the input stage and the cooling chamber is maintained when the first die 332 and the second die 333 slide by the expansion and contraction of the bellows 543 itself. The communication between the cooling chamber and the output section can be performed in the same way and will not be described further.
In some embodiments, the connecting rods 323 correspond one-to-one with each mold unit 330; the cooling channel includes a liquid inlet channel from the connection block 420 to the die unit 330 via the connection rod 323, and a liquid discharge channel from the die unit 330 to the connection block 420 via the same connection rod 323.
That is, in this embodiment, the cooling channels are provided in plurality one by one with each mold unit 330, and the plurality of cooling channels are provided in parallel, so that the temperature of each mold unit 330 can be adjusted to maintain each mold unit 330 at the optimum temperature, and thus the plastic blow molding machine can be used more effectively, compared to the case where one cooling channel is provided and a plurality of cooling channels are provided in parallel in this embodiment.
The connection between the connecting block 420 and the central body 321 can refer to the connection structure between the connecting block 420 and the central body 321, and the cooling channel includes a first passage, a second passage, a third passage, a fourth passage, a fifth passage and a sixth passage; the first passage is disposed on the central body 321 and communicated with a side wall of the first annular groove 3211, the second passage is disposed on the connecting rod 323 and communicated with the first passage, the third passage is disposed on the annular member 322 and communicated with the second passage, the fourth passage is disposed on the mold unit 330 and communicated with the third passage, the fifth passage is disposed on the same connecting rod 323 and communicated with the fourth passage, and the sixth passage is disposed on the central body 321 and communicated with the fifth passage and the second annular groove 3212. Which has the same principle as the structure of the present embodiment described above, and which is not shown in the drawings of the present embodiment.
In this embodiment, referring to fig. 1, the driving device 310 is a motor, and a motor shaft of the motor passes through the connecting hole and is connected to the central body 321, so that the central body 321 can be driven to rotate by the rotation of the motor shaft.
On the basis of the above structure, the present embodiment further provides a structure capable of improving the uniformity of the wall thickness of the finished product of the plastic blow molding machine, and specifically, referring to fig. 6, the blowing assembly 200 includes a blowing pipe 210, and the blowing pipe 210 has a blowing end capable of extending into the mold unit 330;
the air blowing end is provided with an air equalizing unit 220, the air equalizing unit 220 is provided with a mounting blind hole, the mounting blind hole comprises a sleeving section sleeved on the air blowing end and an air equalizing section which is connected in series with the sleeving section and is positioned below the air blowing pipe 210, and the bottom surface of the mounting blind hole and the side surface of the air equalizing section are respectively provided with a plurality of air holes 223.
In the prior art, gas is directly blown into the inner cavity of the finished product through the gas blowing pipe 210, and the inner wall of the finished product, which is opposite to the gas blowing pipe 210, has larger bearing pressure, so that the plastic at the position flows towards the peripheral side before the product is cooled and shaped, and the wall thickness at the position is thinner. Compared with the prior art, in the scheme of the embodiment, before the external air enters the inner cavity of the finished product, the air is firstly dispersed through the air holes 223, so that the air pressure is prevented from being concentrated together, and the local thinness of the finished product can be avoided.
On the basis of the above structure, the present embodiment further improves the structure that enables the gas-equalizing unit 220 to have a better use effect, specifically, referring to fig. 6 and 7, the gas-equalizing unit 220 of the present embodiment includes a body 221 and a buffer 222, and the buffer 222 is sleeved on the body 221; each air hole 223 includes a straight hole section 2231 and an inclined hole section 2232, the straight hole section 2231 is disposed on the body 221, and the inclined hole section 2232 is disposed on the buffer member 222 and connected to the straight hole section 2231.
Specifically, after the gas in the gas blowing pipe 210 is dispersed through the gas holes 223, the side wall of the finished product opposite to the gas holes 223 may still be affected by the gas outlet of the gas holes 223, and the thickness of the finished product is uneven, in this embodiment, each gas hole 223 is configured to include a straight hole section 2231 and an inclined hole section 2232, and after the gas collides with the inner wall of the inclined hole section 2232 through the straight hole section 2231, the kinetic potential energy of the gas is reduced, so that the influence of the gas outlet of the gas holes 223 on the wall thickness of the finished product can be reduced, and the wall thickness of the finished product is uniform.
On the basis of the above structure, the present embodiment further provides a better way to arrange each ventilation hole 223, and specifically, referring to fig. 7, each ventilation hole 223 is arranged in pairs, and the inclined hole sections 2232 of the two ventilation holes 223 in each pair are oppositely arranged. The inclined hole sections 2232 of the two air holes 223 are arranged oppositely, which means that the inclined directions of the inclined hole sections 2232 of the two air holes 223 are opposite, or the air outlets of the two inclined sections arranged oppositely can intersect or collide with each other. Therefore, the power of the airflow can be further reduced, the influence on the wall thickness of the finished product can be further reduced, and the uniformity of the wall thickness of the finished product is improved.
Example two
On the basis of the plastic blow molding machine with uniform thickness of the finished product provided by the first embodiment, the present embodiment provides a plastic blow molding method with uniform thickness of the finished product, which is applied to the plastic blow molding machine with uniform thickness of the finished product provided by the first embodiment, and the plastic blow molding method includes the following steps:
starting the driving device 310, driving the central body 321 and the mounting frame 320 to rotate by the driving device 310, so that each mold unit 330 moves to the lower part of the extrusion assembly 100 and the blowing assembly 200 in sequence;
the product is molded in the die unit 330 by the extrusion assembly 100 and the blowing assembly 200;
and detecting the temperature of the mold unit 330, and if the temperature of the mold unit 330 is greater than a preset temperature threshold, starting the pump body 410, and inputting cooling liquid into the liquid inlet through the pump body 410.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The plastic blow molding machine is characterized by further comprising a molding assembly (300), wherein the molding assembly (300) comprises a driving device (310), a mounting frame (320), a cooling assembly and a plurality of mold units (330);
the mounting rack (320) comprises a central body (321), a ring piece (322) and a plurality of connecting rods (323), wherein the ring piece (322) is sleeved on the central body (321), and each connecting rod (323) is connected between the central body (321) and the ring piece (322);
the driving device (310) is connected with the central body (321) and can drive the central body (321) to rotate;
the die units (330) are arranged on the mounting rack (320) at intervals and can move to the lower parts of the extrusion assembly (100) and the blowing assembly (200) in sequence along with the rotation of the mounting rack (320);
the cooling assembly comprises a pump body (410) and a connecting block (420); the connecting block (420) is fixedly arranged on the base and is abutted against the central body (321); and a cooling channel is arranged between the connecting block (420) and each mould unit (330), the cooling channel is provided with a liquid inlet and a liquid outlet, and the pump body (410) is used for pumping cooling liquid from the liquid inlet to the liquid outlet.
2. A plastic blow molding machine of uniform finished thickness as claimed in claim 1 wherein: a liquid inlet hole (421) and a liquid outlet hole (422) are formed in the connecting block (420), and the liquid inlet hole (421) and the liquid outlet hole (422) penetrate through the connecting block (420); the liquid inlet hole (421) forms the liquid inlet, the liquid discharge hole (422) forms the liquid discharge port, and the output end (542) of the pump body (410) is communicated with the liquid inlet.
3. A plastic blow molding machine of uniform finished thickness as claimed in claim 2 wherein: the side surface of the central body (321) abutted to the connecting block (420) is provided with a first annular groove (3211) and a second annular groove (3212), the first annular groove (3211) and the second annular groove (3212) are arranged at intervals, the first annular groove (3211) is opposite to the liquid inlet hole (421), and the second annular groove (3212) is opposite to the liquid outlet hole (422).
4. A plastic blow molding machine of uniform finished thickness as claimed in claim 3 wherein: the cooling channel includes a first communication hole (510), a second communication hole (520), a third communication hole (530), a fourth communication hole, and a fifth communication hole (550);
the first communicating hole (510) is arranged on the central body (321) and communicated with the first annular groove (3211);
the second communication hole (520) is provided in one of the connection rods (323) and communicates with the first communication hole (510);
the third communication holes (530) are formed in the annular piece (322), the third communication holes (530) are arranged at intervals, and the first end third communication hole (530) is communicated with the second communication hole (520);
the fourth communication hole is formed in the die unit (330) and communicates with two adjacent third communication holes (530);
the fifth communication hole (550) is provided in the other of the connecting rods (323), one end of the fifth communication hole (550) communicates with the third communication hole (530) at the end, and the other end of the fifth communication hole (550) communicates with the second annular groove (3212).
5. A plastic blow molding machine of uniform finished thickness as claimed in claim 4 wherein: the mould unit (330) comprises a base (331), and a first mould (332) and a second mould (333) which are respectively arranged on the base (331) in a sliding way;
the fourth communication hole comprises an input section arranged on the base (331), cooling cavities respectively arranged on the first die (332) and the second die (333), and an output section arranged on the base (331);
the input end (541) of each cooling cavity is connected with the input section through a corrugated pipe (543), and the output end (542) of each cooling cavity is connected with the output section through the corrugated pipe (543).
6. A plastic blow molding machine of uniform finished thickness as claimed in claim 1 wherein: the connecting rods (323) correspond to the die units (330) one by one; the cooling channel includes a liquid inlet channel from the connecting block (420) to the die unit (330) via the connecting rod (323), and a liquid discharge channel from the die unit (330) to the connecting block (420) via the same connecting rod (323).
7. A plastic blow molding machine of uniform finished thickness according to any of claims 1 to 6 characterized by: the blowing assembly (200) comprises a blowing pipe (210), and the blowing pipe (210) is provided with a blowing end capable of extending into the mold unit (330);
the air blowing end is provided with an air equalizing unit (220), the air equalizing unit (220) is provided with a mounting blind hole, the mounting blind hole comprises a sleeving section sleeved on the air blowing end and an air equalizing section which is connected in series with the sleeving section and located below the air blowing pipe (210), and the bottom surface of the mounting blind hole and the side surface of the air equalizing section are respectively provided with a plurality of air holes (223).
8. A plastic blow molding machine of uniform finished thickness as claimed in claim 7 wherein: the gas-homogenizing unit (220) comprises a body (221) and a buffer piece (222), wherein the buffer piece (222) is sleeved on the body (221);
each air hole (223) comprises a straight hole section (2231) and an inclined hole section (2232), the straight hole section (2231) is arranged on the body (221), and the inclined hole section (2232) is arranged on the buffer piece (222) and connected with the straight hole section (2231).
9. A plastic blow molding machine of uniform finished thickness as claimed in claim 8 wherein: the air holes (223) are arranged in pairs, and the inclined hole sections (2232) of the two air holes (223) in each pair are arranged oppositely.
10. A method for blow moulding plastics with a uniform finished thickness, using a machine for blow moulding plastics with a uniform finished thickness according to any one of claims 1 to 9, characterized in that it comprises the following steps:
starting a driving device (310), driving the central body (321) and the mounting rack (320) to rotate by the driving device (310), and enabling each mould unit (330) to move below the extrusion assembly (100) and the blowing assembly (200) in sequence;
forming the product in a die unit (330) by an extrusion assembly (100) and a blow assembly (200);
and detecting the temperature of the die unit (330), starting the pump body (410) if the temperature of the die unit (330) is greater than a preset temperature threshold value, and inputting cooling liquid into the liquid inlet through the pump body (410).
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| CN113927876B (en) | 2024-05-17 |
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