CN117621355B - Plastic injection molding device - Google Patents
Plastic injection molding device Download PDFInfo
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- CN117621355B CN117621355B CN202311863571.3A CN202311863571A CN117621355B CN 117621355 B CN117621355 B CN 117621355B CN 202311863571 A CN202311863571 A CN 202311863571A CN 117621355 B CN117621355 B CN 117621355B
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- 229920003023 plastic Polymers 0.000 title claims abstract description 91
- 239000004033 plastic Substances 0.000 title claims abstract description 91
- 238000001746 injection moulding Methods 0.000 title claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 177
- 239000007924 injection Substances 0.000 claims abstract description 177
- 230000007246 mechanism Effects 0.000 claims abstract description 154
- 238000010438 heat treatment Methods 0.000 claims abstract description 63
- 238000007789 sealing Methods 0.000 claims abstract description 59
- 238000004321 preservation Methods 0.000 claims abstract description 11
- 239000007787 solid Substances 0.000 claims abstract description 4
- 238000009826 distribution Methods 0.000 claims description 39
- 239000002184 metal Substances 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000007711 solidification Methods 0.000 abstract description 3
- 230000008023 solidification Effects 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 52
- 239000002994 raw material Substances 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a plastic injection molding device, which comprises a heating plasticizing mechanism, an injection mechanism and a mold, wherein the heating plasticizing mechanism, the injection mechanism and the mold are arranged on a rack; a sealing baffle is arranged at one end of the charging barrel, which faces the die, the injection tube penetrates through the sealing baffle, and the injection tube and the sealing baffle are in sliding and sealing fit; the feeding end of the injection tube is connected with a solid driving rod, the side wall of the feeding end of the injection tube is provided with a feeding hole, the driving rod penetrates through the piston, and the driving rod is in sliding and sealing fit with the piston; the driving rod is connected with a syringe driving mechanism for driving the syringe to axially move. After injection is completed, the injection tube can be stored in the charging barrel for heat preservation, and the injection tube is prevented from being blocked due to cooling and solidification of residual plastic in the injection tube.
Description
Technical Field
The invention belongs to the field of injection molding equipment, and particularly relates to a plastic injection molding device.
Background
Plastic products are widely applied in various fields, injection molding is a very common processing mode of plastic products, the existing injection molding device generally comprises a mold, a heating plasticizing mechanism, an injection mechanism and the like, plastic raw materials are heated and plasticized by the heating plasticizing mechanism and then are conveyed to the injection mechanism, and the injection mechanism injects molten plastic into the mold through an injection pipe. After each injection, plastic materials remain in the injection tube, the injection tube is generally exposed to air, and the plastic materials in the injection tube can be rapidly cooled and solidified, so that the injection tube is easy to be blocked.
In order to prevent the injection tube from being blocked, CN202311227407.3 discloses a polylactic acid plastic injection molding machine, through setting up the cleaning head at the tip of pushing away material screw rod, clear away and bring back the barrel with the plastics that remain in the nozzle, the cleaning effect to the nozzle is better, can prevent effectively that the solidification of the plastics material that remains in the nozzle from blocking up the nozzle, but the structure of cleaning head is comparatively complicated.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the plastic injection molding device which can prevent the residual plastic material from solidifying to block the injection tube, and has the advantages of simpler structure and low manufacturing difficulty.
In order to solve the problems, the invention adopts the following technical scheme: the plastic injection molding device comprises a heating plasticizing mechanism, an injection mechanism and a mold which are arranged on a frame, wherein the injection mechanism comprises a charging barrel, one end of the charging barrel, which faces the mold, is provided with an injection tube, the heating plasticizing mechanism is communicated with the charging barrel, the outer wall of the charging barrel is provided with a heat preservation mechanism,
A piston is arranged in the charging barrel, and is connected with a piston driving mechanism;
The injection tube penetrates through the sealing baffle plate, and the injection tube and the sealing baffle plate are in sliding and sealing fit; the feeding end of the injection tube is connected with a solid driving rod, the side wall of the feeding end of the injection tube is provided with a feeding hole, the driving rod penetrates through the piston, and the driving rod is in sliding and sealing fit with the piston; the driving rod is connected with a syringe driving mechanism for driving the syringe to axially move.
Further, the sealing baffle is provided with a through hole, a sealing sleeve is arranged in the through hole, one end of the sealing sleeve stretches into the charging barrel, the injection tube is positioned in the sealing sleeve, and the injection tube is in sliding and sealing fit with the sealing sleeve.
Further, one end of the charging barrel far away from the injection tube is hinged to the frame, a telescopic mechanism is hinged between the middle part of the charging barrel and the frame, and the heating plasticizing mechanism is connected with the charging barrel through a metal hose.
Further, the piston driving mechanism and the injection tube driving mechanism are hydraulic cylinders, a mounting plate is arranged at one end of the charging barrel, which is far away from the injection tube, and the cylinder bodies of the piston driving mechanism and the injection tube driving mechanism are fixedly mounted on the mounting plate.
Further, the injection mechanisms are multiple, the charging barrel of each injection mechanism is connected with the heating plasticizing mechanism through a metal hose, the charging barrel of each injection mechanism is hinged to the frame, and a telescopic mechanism is hinged between each charging barrel and the frame;
The die is provided with a plurality of pouring gates, each pouring gate is connected with a plurality of rotary feeding mechanisms, each rotary feeding mechanism comprises a fixed pipe, a fixed sleeve, a rotating body and a rotary pipe, each fixed sleeve is provided with an inner cavity, the side wall of each inner cavity is provided with an inner matching spherical surface, the outer wall of each rotating body is provided with an outer matching spherical surface, the rotating body is provided with a channel penetrating through the rotating body, the outer matching spherical surface of each rotating body is positioned in the fixed sleeve, the outer matching spherical surfaces and the inner matching spherical surfaces are in sliding and sealing fit, one end of each channel is communicated with the inner cavity of each fixed sleeve, and the other end of each channel is fixedly connected with the corresponding rotary pipe; the outer matching spherical surface is provided with a pin shaft which is in running fit with the fixed sleeve; one end of the fixed pipe is connected with the pouring gate of the die, and the other end of the fixed pipe is communicated with the inner cavity of the fixed sleeve; the syringe can extend into the rotation tube.
Further, the number of the injection mechanisms is 4, wherein 3 injection mechanisms are uniformly distributed around the other 1 injection mechanism in a circumferential shape.
Further, the fixed pipe is detachably connected with the gate of the mold.
Further, a lifting support platform is arranged on the frame, lifting press blocks are arranged above the lifting support platform, the die is arranged between the lifting support platform and the lifting press blocks, and translation press blocks are arranged on two sides of the die.
Further, the heating plasticizing mechanism comprises a heating cylinder, the heating cylinder is externally provided with a heating mechanism, a rotating shaft and a cylindrical flow distribution disc are fixedly arranged in the heating cylinder, the rotating shaft penetrates through the flow distribution disc and is in rotating fit with the flow distribution disc, spiral conveying sheets are arranged on the outer walls of the rotating shafts on two sides of the flow distribution disc, and one end of the rotating shaft is connected with a rotation driving mechanism; the flow distribution disc is provided with a plurality of first flow distribution through holes and second flow distribution through holes which axially penetrate through the flow distribution disc along the flow distribution disc, the first flow distribution through holes are communicated with the edge of the first end face of the flow distribution disc and the middle position of the second end face, and the second flow distribution holes are communicated with the middle position of the first end face of the flow distribution disc and the edge of the second end face.
The beneficial effects of the invention are as follows: during injection, the driving rod and the injection tube are pushed by the injection tube driving mechanism to move towards the direction of the mould until the injection tube stretches into the pouring gate of the mould, then the piston driving mechanism is utilized to push the piston to move towards the direction of the mould, and the piston pushes the plastic material inside the charging barrel to enter the injection tube and be injected into the pouring gate. After injection is completed, the syringe drive mechanism pushes the drive rod and syringe in a direction away from the mold until the syringe returns to the interior of the barrel. Under the effect of heat preservation mechanism, the inside higher temperature that has of feed cylinder consequently can keep warm the plastics material in the feed cylinder, ensures that plastics material is in suitable injection molding temperature, also can keep warm the injection syringe simultaneously, prevents that remaining plastics material cooling solidification from leading to blockking up the injection syringe in the injection syringe. The invention has the advantages of relatively simple structure and lower manufacturing difficulty.
Drawings
FIG. 1 is a schematic front view of a first embodiment of the present invention;
FIG. 2 is an enlarged schematic view of portion A of FIG. 1;
FIG. 3 is a schematic front view of a second embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of B-B of FIG. 3;
FIG. 5 is an enlarged schematic view of portion C of FIG. 3;
FIG. 6 is a schematic diagram of the positioning of a mold in embodiment two;
FIG. 7 is a schematic cross-sectional view of the heating plasticizing mechanism of the present invention;
Reference numerals: 1-a heating plasticizing mechanism; 2, a charging barrel; 3, a mold; 4-a syringe; 5-a piston; 6-a piston driving mechanism; 7, a sealing baffle; 8-a driving rod; 9-a feed inlet; 10-syringe drive mechanism; 11-sealing sleeve; 12-a frame; 13-a telescopic mechanism; 14-a metal hose; 15-mounting plate; 16-a fixed tube; 17-a fixed sleeve; 18-a rotor; 19-rotating the tube; 20-channel; 21-a pin shaft; 22-lifting support platform; 23-lifting type pressing blocks; 24-translational briquetting; 25-a diverter tray; 26-a rotating shaft; 27-spiral conveying sheets; 28-a rotation driving mechanism; 29-a first shunt through hole; 30-a second shunt through hole.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Example 1
The plastic injection molding device of this embodiment, as shown in fig. 1 and 2, comprises a heating plasticizing mechanism 1, an injection mechanism and a mold 3 which are arranged on a frame 12, wherein the injection mechanism comprises a charging barrel 2, the charging barrel 2 is provided with an injection tube 4 towards one end of the mold 3, the heating plasticizing mechanism 1 is communicated with the charging barrel 2, and the outer wall of the charging barrel 2 is provided with a heat preservation mechanism.
The heating and plasticizing mechanism 1 is used to heat the plastic raw material to a suitable temperature so that the plastic material is in a molten state to facilitate injection of the plastic material into the mold 3. The mold 3 is used for molding plastic products, and various existing molds are adopted. The injection mechanism is used for injecting plastic materials into the mould 3, after the plastic raw materials are heated to a molten state in the heating plasticizing mechanism 1, the heating plasticizing mechanism 1 conveys the plastic materials into the charging barrel 2, and then the injection pipe 4 injects the plastic materials into the mould 3. The mold 3 has a gate, and the port of the injection tube 4 extends into the gate of the mold 3 when injecting. The heat preservation mechanism is used for carrying out heat preservation to the charging barrel 2, so that plastic materials in the charging barrel 2 are always at proper temperature, and the plastic materials are prevented from being reduced in temperature to cause poor fluidity. The heat preservation mechanism specifically may include a temperature detecting element, a heating element and a heat preservation layer, where the temperature detecting element may be a temperature sensor or a thermocouple, and is used for detecting the temperature of the barrel 2, and the heating element is used for heating the barrel 2, and may be an electric heating element. When the temperature detecting element detects that the temperature of the cartridge 2 is reduced, the heating element starts to operate, and the cartridge 2 is heated, so that the cartridge 2 is always kept in a proper temperature range. The insulating layer covers the cartridge 2, and the temperature detecting element and the heating element are located inside the insulating layer. The heat preservation mechanism is a common structure of injection molding equipment, and is only needed by adopting the prior art, and is not shown in the figure.
A piston 5 is arranged in the charging barrel 2, and the piston 5 is connected with a piston driving mechanism 6; one end of the charging barrel 2 facing the die 3 is provided with a sealing baffle 7, the injection tube 4 penetrates through the sealing baffle 7, and the injection tube 4 is in sliding and sealing fit with the sealing baffle 7; the feeding end of the injection tube 4 is connected with a solid driving rod 8, the side wall of the feeding end of the injection tube 4 is provided with a feeding hole 9, the driving rod 8 penetrates through the piston 5, and the driving rod 8 is in sliding and sealing fit with the piston 5; the driving rod 8 is connected with a syringe driving mechanism 10 for driving the syringe 4 to axially move.
One end of the charging barrel 2 is a discharging end, namely one end of the plastic material is extruded, and the injection tube 4 is arranged at the discharging end of the charging barrel 2. The piston 5 is in sliding fit with the inner wall of the charging barrel 2, and good sealing performance is achieved between the piston 5 and the charging barrel 2. When the piston driving mechanism 6 pushes the piston 5 towards the discharge end, the plastic material can be extruded into the injection tube 4.
The sealing baffle 7 is arranged at the discharge end of the charging barrel 2, the port of the charging barrel 2 is closed, a plastic material storage space is formed between the sealing baffle 7 and the piston 5, and the plastic raw material is extruded into the plastic material storage space after being heated and plasticized by the heating plasticizing mechanism 1. The injection tube 4 and the sealing baffle 7 are in sliding and sealing fit, namely, the injection tube 4 can slide relative to the sealing baffle 7, and good sealing performance is realized between the injection tube 4 and the sealing baffle 7, so that leakage of plastic materials from a fit gap between the injection tube 4 and the sealing baffle 7 is prevented. The drive rod 8 is used to connect the syringe 4 and the syringe drive mechanism 10 such that the syringe drive mechanism 10 is capable of transmitting power to the syringe 4 through the drive rod 8, thereby driving the syringe 4 to move axially.
In the invention, since the injection tube 4 can axially move, when the injection tube 4 is not injected, the injection tube 4 stretches into the injection tube 2, and when the injection tube is injected, the injection tube driving mechanism 10 pushes the injection tube 4 to extend outwards out of the injection tube 2, so that the outer end of the injection tube 4 stretches into a gate of the die 3, the feed inlet 9 is always positioned in the injection tube 2, then the piston 5 is pushed by the piston driving mechanism 6 to move towards the injection tube 4, the plastic material in the injection tube 2 is extruded, the plastic material enters the injection tube 4 through the feed inlet 9, and then is injected into the die 3 through the injection tube 4. After injection is completed, the injection tube driving mechanism 10 drives the injection tube 4 to move towards the inside of the charging barrel 2, so that the injection tube 4 enters the charging barrel 2, the injection tube 4 is prevented from being exposed in the outside air to be rapidly cooled, and the plastic material is insulated while the plastic material is insulated because the temperature in the charging barrel 2 is higher than the outside temperature, so that the residual plastic material in the injection tube 4 is prevented from being cooled and solidified to block the injection tube 4.
The injection tube 4 can be directly in sliding fit with the sealing baffle 7, but after injection is completed, the whole injection tube 4 cannot be received into the charging barrel 2, in order to enable the whole injection tube 4 to completely enter the charging barrel 2, a through hole is formed in the sealing baffle 7, a sealing sleeve 11 is arranged in the through hole, one end of the sealing sleeve 11 extends into the charging barrel 2, the injection tube 4 is positioned in the sealing sleeve 11, and the injection tube 4 is in sliding and sealing fit with the sealing sleeve 11. The sealing sleeve 11 is fixedly arranged on the sealing baffle 7, the sealing sleeve 11 is partially positioned inside the charging barrel 2, the injection tube 4 can slide relative to the sealing sleeve 11, after injection is completed, the injection tube 4 can be driven by the injection tube driving mechanism 10 to completely enter the charging barrel 2, the end part of the injection tube 4 is positioned in the sealing sleeve 11, the whole injection tube 4 can be insulated, and meanwhile, plastic material leakage can be prevented.
In the injection gap, the syringe 4 is in the cartridge 2, and the residual plastic material does not block the syringe 4, but also causes the plastic material in the syringe 4 to have a certain fluidity, and the plastic material may flow out of the syringe 4 and fall down on the lower part, resulting in plastic material waste and inconvenient cleaning of the dropped plastic. Therefore, in this embodiment, the cartridge 2 may be disposed horizontally or vertically, but preferably, the amount of the residual plastic drops is reduced by the horizontal arrangement. Meanwhile, in order to further prevent residual plastic from dripping, one end of the charging barrel 2 far away from the injection tube 4 is hinged to the frame 12, a telescopic mechanism 13 is hinged between the middle part of the charging barrel 2 and the frame 12, and the heating plasticizing mechanism 1 is connected with the charging barrel 2 through a metal hose 14. The telescopic mechanism 13 can adopt hydraulic cylinders and other devices, and when the telescopic mechanism 13 stretches, the telescopic mechanism can drive the charging barrel 2 to rotate, so that the angle between the charging barrel 2 and the horizontal plane can be adjusted. Specifically, during injection, the charging barrel 2 is in a horizontal position, and after injection is completed, the telescopic mechanism 13 drives the charging barrel 2 to rotate upwards by a proper angle, so that the height of the injection end of the injection tube 4 is higher than that of the feeding hole 9, and the residual plastic material in the injection tube 4 can flow back to the charging barrel 2 or stay in the injection tube 4 to prevent the residual plastic material in the injection tube 4 from dripping. The injection end of the injection tube 4 is the end connected with the gate of the die 3, and the injection end and the feeding hole 9 are respectively positioned at two ends of the injection tube 4. During injection, the telescopic mechanism 13 drives the charging barrel 2 to rotate to the horizontal position.
In order to simplify the installation of the piston driving mechanism 6 and the syringe driving mechanism 10, the piston driving mechanism 6 and the syringe driving mechanism 10 are both hydraulic cylinders, one end of the charging barrel 2, which is far away from the syringe 4, is provided with an installation plate 15, and the cylinder bodies of the piston driving mechanism 6 and the syringe driving mechanism 10 are fixedly installed on the installation plate 15. By adopting the mounting mode, the charging barrel 2, the piston driving mechanism 6, the injection tube driving mechanism 10, the injection tube 4 and the like are integrated, and can integrally and synchronously rotate under the drive of the telescopic mechanism 13.
Example two
When the size of the plastic product is large, since the fluidity of the molten plastic is not strong, it is difficult to fully fill the cavity of the mold 3, therefore, when the plastic product with large size is prepared, a plurality of gates are often arranged on the mold 3,2 gates, 3 gates or 4 gates can be arranged on the mold 3 according to the specific shape of the plastic product, the gates are generally uniformly distributed according to a certain rule, for example, when a plastic gear with large size is manufactured, 3 gates can be arranged, and the 3 gates are uniformly distributed around the center of the cavity. During injection, plastic materials are simultaneously injected into all the pouring gates, so that the plastic materials can fill the cavity better and faster. When a plurality of gates are arranged on the mold 3, a plurality of injection mechanisms are required to perform injection simultaneously, and the adopted mold size and gate distribution are different due to different shapes and sizes of different plastic products, so that the nozzle position of the existing injection molding machine cannot be adjusted or is inconvenient to adjust, and the injection of the molds with various gate numbers and gate positions is difficult.
In order to realize injection molding of plastic products of various sizes by using one set of injection equipment, the plastic injection molding device of the embodiment comprises a heating plasticizing mechanism 1, an injection mechanism and a mold 3 which are arranged on a frame 12, wherein the injection mechanism comprises a charging barrel 2, one end of the charging barrel 2, which faces the mold 3, is provided with an injection tube 4, the heating plasticizing mechanism 1 is communicated with the charging barrel 2, and the outer wall of the charging barrel 2 is provided with a heat preservation mechanism. The structure of each injection mechanism is identical to that of the first embodiment, the charging barrel 2 of each injection mechanism is connected with the heating plasticizing mechanism 1 through a metal hose 14, the charging barrel 2 of each injection mechanism is hinged to the frame 12, and a telescopic mechanism 13 is hinged between each charging barrel 2 and the frame 12.
The die 3 is provided with a plurality of pouring gates, each pouring gate is connected with a plurality of rotary feeding mechanisms, each rotary feeding mechanism comprises a fixed pipe 16, a fixed sleeve 17, a rotary body 18 and a rotary pipe 19, the fixed sleeve 17 is provided with an inner cavity, the side wall of the inner cavity is provided with an inner matched spherical surface, the outer wall of the rotary body 18 is provided with an outer matched spherical surface, the rotary body 18 is provided with a channel 20 penetrating the rotary body 18, the outer matched spherical surface of the rotary body 18 is positioned in the fixed sleeve 17, the outer matched spherical surface and the inner matched spherical surface are in sliding and sealing fit, one end of the channel 20 is communicated with the inner cavity of the fixed sleeve 17, and the other end of the channel 20 is fixedly connected with the rotary pipe 19; the pin shaft 21 is arranged on the outer matching spherical surface, and the pin shaft 21 is in rotary fit with the fixed sleeve 17; one end of the fixed pipe 16 is connected with the pouring gate of the die 3, and the other end of the fixed pipe 16 is communicated with the inner cavity of the fixed sleeve 17; the syringe 4 can be inserted into the rotation tube 19.
The fixed sleeve 17 can adopt a 2/3 spherical shell, the rotating body 18 can adopt a 2/3 sphere, the rotating body 18 is matched with the fixed sleeve 17 through a spherical surface, and when the rotating body 18 rotates, the matching surface can be always attached, so that the sealing is kept. The pin shaft 21 is in rotating fit with the fixed sleeve 17, namely, the pin shaft 21 can rotate around the central line of the pin shaft 21, the pin shaft 21 plays a role in positioning, and the position of the rotator 18 is ensured to be stable. Specifically, a circular hole may be provided in the fixed sleeve 17, and the pin 21 is inserted into the circular hole and is engaged with the circular hole in a rotating manner, in which the rotator 18 can rotate only in two directions. In addition, a positioning groove with a certain length can be arranged on the fixed sleeve 17, and the pin shaft 21 is positioned in the positioning groove and is in sliding fit with the positioning groove. By adopting the matching mode, the pin shaft 21 can slide in the positioning groove and rotate around the central line of the pin shaft, namely, the rotation direction of the rotating body 18 can be adjusted, the use is more flexible, and the rotating tube 19 can be aligned with the injection tube 4 more quickly.
The rotary tube 19, the channel 20, the inner cavity of the fixed sleeve 17, the fixed tube 16 and the gate are sequentially communicated, and plastic materials can be injected into the mold 3 as long as the rotary tube 19 is connected with the injection tube 4.
In this embodiment, the telescopic mechanism 13 is used to adjust the angle of the barrel 2 so that the injection tube 4 on the barrel 2 can be aligned with the gate on the mold 3. In order to ensure that the injection tube 4 smoothly injects plastic materials into the pouring gate, the rotary feeding mechanism is further arranged at each pouring gate, the rotary tube 19 of the rotary feeding mechanism can rotate, so that the rotary tube 19 can be aligned with the injection tube 4, after the injection tube 4 is aligned with the rotary tube 19, the injection tube 4 is pushed to extend outwards by using the injection tube driving mechanism 10, the end part of the injection tube 4 extends into the rotary tube 19, then the plastic materials can be extruded into the injection tube 4, and the plastic materials sequentially pass through the injection tube 4, the rotary tube 19, the channel 20, the inner cavity of the fixed sleeve 17, the fixed tube 16 and the pouring gate and then are injected into the die 3.
In this embodiment, the charging barrel 2 is a relatively slender barrel, so that the occupied area is reduced.
The invention adopts a plurality of injection mechanisms, the angle of the injection tube 4 of each injection mechanism can be adjusted, the angle of the rotary tube 19 at each pouring gate can also be adjusted, and the angles of the injection tube 4 and the rotary tube 19 can be flexibly adjusted aiming at moulds 3 with different sizes and different pouring gate positions, so that the injection tube 4 of each injection mechanism is aligned with the rotary tube 19 at one pouring gate, and plastic materials are injected into the moulds 3 at all pouring gates simultaneously.
In this embodiment, one injection device can inject the molds 3 with various sizes and the gates with various positional relationships, and the injection device is flexible in use and wide in application range.
Since the number of gates is generally 2, 3 or 4, and the plurality of gates are uniformly distributed, the injection mechanism is 4, wherein 3 injection mechanisms are uniformly distributed circumferentially around the other 1 injection mechanism, i.e., wherein 1 injection mechanism is located in the middle, and the other 3 injection mechanisms are uniformly distributed around the middle injection mechanism. This distribution of the injection mechanism may be satisfactory for 2, 3 or 4 gate mold 3 injections.
Since plastic material remains in the rotary feed mechanism and is liable to be blocked, the fixed pipe 16 is detachably connected to the gate of the mold 3. After the plastic product is demolded, the rotary feeding mechanism can be disassembled, and residual plastic materials in the rotary feeding mechanism can be cleaned and reused. Specifically, the rotary feed mechanism may be heated so that the residual plastic material is melted, and then blown to the rotary tube 19 or the fixed tube 16 by the blowing tube to blow out the residual plastic. The fixed pipe 16 can be in threaded connection with the pouring gate, is quite convenient to assemble and disassemble, and has good sealing performance after connection.
In order to facilitate adjusting the position of the die 3 so as to align the rotary tube 19 at the pouring gate with the injection tube 4, a lifting support platform 22 is arranged on the frame 12, a lifting press block 23 is arranged above the lifting support platform 22, the die 3 is arranged between the lifting support platform 22 and the lifting press block 23, and translational press blocks 24 are arranged on two sides of the die 3. The lifting support platform 22 can be a lifting support platform, and specifically comprises a lifting mechanism and a support platform, wherein the support platform can be a metal plate, and the lifting mechanism can be a hydraulic cylinder and other devices. Likewise, the elevating press 23 includes an elevating mechanism and a press block, and the translational press block 24 can horizontally move, and a hydraulic cylinder or the like can be used as a moving power. The lifting support platform 22 supports the bottom surface of the die 3, the lifting press block 23 presses the top surface of the die 3, and the translation press block 24 presses two sides of the die 3, so that the die 3 is kept stable. This clamping is suitable for a nearly horizontal mounting of the cartridge 2. The charging barrel 2 can also adopt a nearly vertical installation mode, the lifting type pressing block 23 is not required, only the lifting type supporting platform 22 and the translation type pressing block 24 are required, at this moment, the pouring gate of the die 3 is positioned on the top surface of the die 3, and the plastic material can be more uniformly filled into the die 3 after entering the die 3 through a plurality of pouring gates. After one injection is completed, the plastic material remained in the injection tube 4 is easy to drop downwards, and a receiving tray can be arranged below the injection tube 4 to collect the dropped plastic.
In the first embodiment and the second embodiment, the heating plasticizing mechanism 1 may be adopted in the prior art, since the charging barrel 2 needs to rotate, the heating plasticizing mechanism 1 is kept fixed, and the heating plasticizing mechanism 1 and the charging barrel 2 cannot be connected in a conventional manner, in the invention, the heating plasticizing mechanism 1 is connected with the charging barrel 2 through the metal hose 14, the metal hose 14 is resistant to high temperature and can bend and deform in a moving range, the charging barrel 2 and the heating plasticizing mechanism 1 can be stably connected when the charging barrel 2 rotates, and plastic materials in the heating plasticizing mechanism 1 enter the charging barrel 2 through the metal hose 14.
As shown in fig. 7, the heating plasticizing mechanism 1 of the present invention specifically includes a heating cylinder, and a heating mechanism is disposed outside the heating cylinder, and the heating mechanism is not shown in the drawings. The heating cylinder is internally fixedly provided with a rotating shaft 26 and a cylindrical flow distribution disc 25, the rotating shaft 26 penetrates through the flow distribution disc 25 and is in running fit with the flow distribution disc 25, spiral conveying sheets 27 are arranged on the outer walls of the rotating shaft 26 on two sides of the flow distribution disc 25, and one end of the rotating shaft 26 is connected with a rotation driving mechanism 28. The rotation driving mechanism 28 can be a motor, and drives the rotating shaft 26 and the spiral conveying sheet 27 to rotate, and the spiral conveying sheet 27 can push the plastic material to move along the axial direction of the heating cylinder. The flow distribution disc 25 is provided with a plurality of first flow distribution holes 29 and second flow distribution holes 30 which penetrate through the flow distribution disc 25 along the axial direction of the flow distribution disc 25, the first flow distribution holes 29 and the second flow distribution holes 30 are independent of each other and are not communicated, the first flow distribution holes 29 are communicated with the middle position of the first end face and the middle position of the second end face of the flow distribution disc 25, and the second flow distribution holes 30 are communicated with the middle position of the first end face and the edge of the second end face of the flow distribution disc 25.
The conventional heating and plasticizing mechanisms 1 are all arranged on the outer wall of a heating cylinder, so that the temperature of the wall of the heating cylinder is higher than that of the center of the wall of the heating cylinder, and the heating of plastic raw materials is difficult to be uniformly maintained. In order to solve this problem, the present invention provides the diverter tray 25 in the heating cartridge, and since the diverter tray 25 is cylindrical, it has two end surfaces, respectively, as the first end surface and the second end surface. When the plastic material reaches the distribution plate 25, the plastic material enters the first distribution through hole 29 and the second distribution through hole 30, the plastic material near the wall of the heating cylinder passes through the first distribution through hole 29 and reaches the middle position of the heating cylinder, and the plastic material at the middle position of the heating cylinder passes through the second distribution through hole 30 and reaches the wall of the heating cylinder and is fully heated. The invention can make the positions of the plastic materials inside and outside the heating cylinder interchanged, thereby uniformly heating the plastic and ensuring the injection performance.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a plastics injection molding device, includes heating plasticizing mechanism (1), injection mechanism and mould (3) of setting on frame (12), injection mechanism includes feed cylinder (2), and feed cylinder (2) are provided with injection tube (4) towards the one end of mould (3), heating plasticizing mechanism (1) and feed cylinder (2) intercommunication, the outer wall of feed cylinder (2) is provided with heat preservation mechanism, its characterized in that:
A piston (5) is arranged in the charging barrel (2), and the piston (5) is connected with a piston driving mechanism (6);
One end of the charging barrel (2) facing the die (3) is provided with a sealing baffle (7), the injection tube (4) penetrates through the sealing baffle (7), and the injection tube (4) is in sliding and sealing fit with the sealing baffle (7); the feeding end of the injection tube (4) is connected with a solid driving rod (8), a feeding hole (9) is formed in the side wall of the feeding end of the injection tube (4), the driving rod (8) penetrates through the piston (5), and the driving rod (8) is in sliding and sealing fit with the piston (5); the driving rod (8) is connected with a syringe driving mechanism (10) for driving the syringe (4) to axially move;
The sealing baffle (7) is provided with a through hole, a sealing sleeve (11) is arranged in the through hole, one end of the sealing sleeve (11) stretches into the charging barrel (2), the injection tube (4) is positioned in the sealing sleeve (11), and the injection tube (4) is in sliding and sealing fit with the sealing sleeve (11);
The injection mechanisms are multiple, the charging barrels (2) of each injection mechanism are connected with the heating plasticizing mechanism (1) through metal hoses (14), the charging barrels (2) of each injection mechanism are hinged to the frame (12), and a telescopic mechanism (13) is hinged between each charging barrel (2) and the frame (12);
The die (3) is provided with a plurality of pouring gates, each pouring gate is connected with a plurality of rotary feeding mechanisms, each rotary feeding mechanism comprises a fixed pipe (16), a fixed sleeve (17), a rotary body (18) and a rotary pipe (19), each fixed sleeve (17) is provided with an inner cavity, the side wall of each inner cavity is provided with an inner matching spherical surface, the outer wall of each rotary body (18) is provided with an outer matching spherical surface, a channel (20) penetrating the rotary body (18) is arranged on each rotary body (18), the outer matching spherical surface of each rotary body (18) is positioned inside the corresponding fixed sleeve (17), the outer matching spherical surfaces are in sliding and sealing fit with the inner matching spherical surfaces, one end of each channel (20) is communicated with the inner cavity of the corresponding fixed sleeve (17), and the other end of each channel (20) is fixedly connected with the corresponding rotary pipe (19); a pin shaft (21) is arranged on the outer matching spherical surface, and the pin shaft (21) is in running fit with the fixed sleeve (17); one end of the fixed pipe (16) is connected with a gate of the die (3), and the other end of the fixed pipe (16) is communicated with an inner cavity of the fixed sleeve (17); the injection tube (4) can extend into the rotation tube (19).
2. The plastic injection molding apparatus of claim 1, wherein: the piston driving mechanism (6) and the injection tube driving mechanism (10) are hydraulic cylinders, one end of the charging barrel (2) far away from the injection tube (4) is provided with a mounting plate (15), and the cylinder bodies of the piston driving mechanism (6) and the injection tube driving mechanism (10) are fixedly mounted on the mounting plate (15).
3. The plastic injection molding apparatus of claim 1, wherein: the number of the injection mechanisms is 4, wherein 3 injection mechanisms are uniformly distributed around the other 1 injection mechanism in a circumferential shape.
4. The plastic injection molding apparatus of claim 1, wherein: the fixed pipe (16) is detachably connected with the pouring gate of the die (3).
5. The plastic injection molding apparatus of claim 1, wherein: the lifting type pressing block is characterized in that a lifting type supporting platform (22) is arranged on the frame (12), a lifting type pressing block (23) is arranged above the lifting type supporting platform (22), the die (3) is arranged between the lifting type supporting platform (22) and the lifting type pressing block (23), and translation type pressing blocks (24) are arranged on two sides of the die (3).
6. The plastic injection molding apparatus of claim 1, wherein: the heating plasticizing mechanism (1) comprises a heating cylinder, a heating mechanism is arranged outside the heating cylinder, a rotating shaft (26) and a cylindrical flow distribution disc (25) are fixedly arranged in the heating cylinder, the rotating shaft (26) penetrates through the flow distribution disc (25) and is in rotating fit with the flow distribution disc (25), spiral conveying sheets (27) are arranged on the outer walls of the rotating shaft (26) on two sides of the flow distribution disc (25), and one end of the rotating shaft (26) is connected with a rotating driving mechanism (28); be provided with a plurality of first reposition of redundant personnel through-holes (29) and second reposition of redundant personnel hole (30) that run through reposition of redundant personnel dish (25) along reposition of redundant personnel dish (25) axial on reposition of redundant personnel dish (25), the intermediate position of the edge of first terminal surface and the second terminal surface of first reposition of redundant personnel through-hole (29) intercommunication reposition of redundant personnel dish (25), the edge of intermediate position and the second terminal surface of second reposition of redundant personnel through-hole (30) intercommunication reposition of redundant personnel dish (25).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311863571.3A CN117621355B (en) | 2023-12-29 | 2023-12-29 | Plastic injection molding device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311863571.3A CN117621355B (en) | 2023-12-29 | 2023-12-29 | Plastic injection molding device |
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| CN117621355A CN117621355A (en) | 2024-03-01 |
| CN117621355B true CN117621355B (en) | 2024-05-24 |
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| CN116238105A (en) * | 2023-03-17 | 2023-06-09 | 刘永峰 | Automatic feeding extrusion molding machine for shell mold processing |
| CN219445923U (en) * | 2022-12-19 | 2023-08-01 | 慈溪市贝斯特汽车零部件有限公司 | Injection molding machine nozzle and injection molding machine |
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| US6030203A (en) * | 1997-02-27 | 2000-02-29 | Mitsubishi Heavy Industries, Ltd. | Injection unit for injection molding machine |
| JP2005342750A (en) * | 2004-06-02 | 2005-12-15 | Japan Steel Works Ltd:The | Injection molding apparatus and method |
| CN203438516U (en) * | 2013-07-30 | 2014-02-19 | 浙江华业塑料机械有限公司 | Injection molding device for injection molding machine |
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| CN117621355A (en) | 2024-03-01 |
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