CN111300781A

CN111300781A - Plastic injection molding device with controllable melt injection pressure

Info

Publication number: CN111300781A
Application number: CN202010206900.7A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2020-06-19

Abstract

The invention discloses a plastic injection molding device with controllable melt injection pressure, which relates to the technical field of plastic production and comprises a machine base, wherein an injection molding cavity side plate is arranged on one side of the upper end of the machine base, a charging barrel is arranged on one side, close to the injection molding cavity side plate, of the upper end of the machine base, a heat preservation barrel is wrapped on the outer side surface of the charging barrel, and a pressure control mechanism is arranged on one side, close to a feeding hopper, of the upper end of the charging barrel. The invention controls and adjusts the melt injection pressure through the pressure control mechanism, realizes the real-time control of the melt injection pressure, avoids the problem of overlarge internal pressure, can recycle heat by adopting the circulating pipe and the heat release pipe to match with the action of cooling liquid and a pressure delivery pump, uses the recycled heat at the outer side of the charging barrel, avoids the problem of loss of internal melt temperature caused by too low temperature at the outer side of the charging barrel, realizes the recycling of heat, reduces the waste of energy and saves resources.

Description

Plastic injection molding device with controllable melt injection pressure

Technical Field

The invention relates to the technical field of plastic production, in particular to a plastic injection molding device with controllable melt injection pressure.

Background

The plastic is a high molecular compound which is polymerized by addition polymerization or polycondensation reaction and is prepared from synthetic resin, filler, plasticizer, stabilizer, lubricant, pigment and other additives, a plurality of devices are needed in the production process of plastic products, a plastic injection device is an indispensable device in the production process of the plastic, the plastic injection device is a main molding device which is used for manufacturing thermoplastic plastics or thermosetting materials into plastic products with various shapes by using a plastic molding die, the plastic injection device is used for melting the plastic before injection molding, then the melted melt is injected into the injection die by an injection device, and the corresponding products are obtained after cooling molding.

But current injection moulding device when the fuse-element enters into injection moulding device's feed cylinder, because feed cylinder outside temperature is great with inside temperature difference in temperature, and then when the fuse-element enters into the feed cylinder, receive the temperature difference reason can make the temperature of fuse-element cause the loss, thereby influence the effect of moulding plastics, and after injection mold was injected to the fuse-element, the inside fuse-element pressure control of feed cylinder is perfect inadequately, thereby influence the fuse-element and inject the effect, consequently, technical personnel in the field provide a controllable plastics injection moulding device of fuse-element injection pressure, in order to solve the problem that proposes in the above-mentioned background art.

Disclosure of Invention

The present invention is directed to a plastic injection molding apparatus with controllable melt injection pressure, which solves the above-mentioned problems of the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a controllable plastics of fuse-element injection pressure device of moulding plastics, includes the frame, upper end one side of frame is provided with the chamber curb plate of moulding plastics, and the upper end of frame is close to one side of moulding plastics the chamber curb plate and is provided with the feed cylinder, the inside one end that corresponds the feed cylinder of the chamber curb plate of moulding plastics is provided with injection mold, one side that the outside one end of feed cylinder is close to the chamber curb plate of moulding plastics is provided with the mount, and the lateral surface parcel of feed cylinder has a heat preservation section of thick bamboo, the other end of feed cylinder is connected with the feeding motor, and the other end of feed cylinder is close to feeding motor output end position department and is provided with the feeder hopper, one side that the upper end of feed cylinder is close to the feeder hopper is.

As a further scheme of the invention: the front side of frame is provided with controls the panel, the inside of feed cylinder is provided with the feeding screw rod, the one end of feeding screw rod is run through the feed cylinder and is connected with the output of pay-off motor.

As a still further scheme of the invention: the heat preservation cylinder is of a cylindrical structure, the inner diameter of the heat preservation cylinder is matched with the outer diameter of the charging cylinder, the heat release pipe is arranged in the heat preservation cylinder in a surrounding mode, one end of the heat release pipe is communicated with the loop pipe, and the other end of the heat release pipe is communicated with the conveying pipe.

As a still further scheme of the invention: the lower extreme of a heat preservation section of thick bamboo is provided with the base, and a heat preservation section of thick bamboo passes through base fixed connection with the frame, feed cylinder one end passes through mount fixed connection with the frame, and the other end of feed cylinder is fixed mutually through a heat preservation section of thick bamboo and base.

As a still further scheme of the invention: the injection molding cavity side plates are four in number and distributed in a rectangular mode, the upper end of the machine base is surrounded into an injection molding cavity, a circulating pipe is arranged inside each injection molding cavity side plate and penetrates through each injection molding cavity side plate, one end of each circulating pipe is communicated with the conveying pipe, and the other end of each circulating pipe is communicated with the loop pipe through a pressure conveying pump.

As a still further scheme of the invention: the pressure control mechanism is including being located the pressure section of thick bamboo that the feed cylinder upper end runs through the heat preservation section of thick bamboo, the front surface of pressure section of thick bamboo is provided with the terminal box, the inside top of pressure section of thick bamboo is provided with pressure sensor, and the inside of pressure section of thick bamboo is located the pressure sensor lower extreme and is provided with the piston, the last surface connection of going up the piston has the ejector pin, the inside lower extreme that is located the piston of pressure section of thick bamboo is provided with down the piston, it has hydraulic oil to fill between piston and the lower piston.

As a still further scheme of the invention: the inside of pressure cylinder is hollow structure, the external diameter of piston and last piston all with the internal diameter looks adaptation of pressure cylinder down, and piston and last piston are the component of a rubber material down, the lower surface middle part of piston is provided with the ejector pin pole down, the one end of ejector pin pole extends to the inside of feed cylinder.

As a still further scheme of the invention: the inboard of feeder hopper is provided with interior fill, and the inside of feeder hopper is provided with the heating chamber, the inside lateral wall that is located interior fill in the heating chamber distributes and has a plurality of heater strips, the one end of heater strip is connected with the control panel through the wire.

Compared with the prior art, the invention has the beneficial effects that: the plastic injection molding device with controllable melt injection pressure designed by the invention has the advantages that during the actual operation, the melt injection pressure in the material cylinder is conveniently controlled and adjusted through the pressure control mechanism, the pressure maintaining is conveniently carried out in the material cylinder after the injection mold is filled, the real-time control on the melt injection pressure is also realized, the problem of overlarge internal pressure is avoided, the automatic operation is realized, the time and the labor are saved, in addition, the circulating pipe and the heat release pipe are adopted to be matched with the action of cooling liquid and the pressure conveying pump, the heat generated during the cooling and molding of the melt in the injection mold can be recycled, the recycled heat is used at the outer side of the material cylinder, the outer side of the material cylinder is kept at a certain temperature, the problem of loss of the internal melt temperature caused by the overlow temperature at the outer side of the material cylinder is avoided, the energy saving and utilization are realized, the, meanwhile, the heat generated during melt injection molding is recycled, so that the energy waste is reduced, and the resources are saved.

Drawings

FIG. 1 is a schematic view of a plastic injection molding apparatus with controllable melt injection pressure;

FIG. 2 is a schematic structural diagram of a heat-insulating cylinder in a plastic injection molding device with controllable melt injection pressure;

FIG. 3 is a schematic view showing the connection between a circulation pipe and a heat release pipe in a plastic injection molding apparatus in which the melt injection pressure is controlled;

FIG. 4 is a schematic diagram of a pressure control mechanism in a plastic injection molding apparatus with controllable melt injection pressure;

FIG. 5 is a schematic view of a feed hopper of a plastic injection molding apparatus with controllable melt injection pressure.

In the figure: 1. a machine base; 2. injection molding a cavity side plate; 3. injection molding a mold; 4. a charging barrel; 5. a fixed mount; 6. a heat-preserving cylinder; 7. a pressure control mechanism; 8. a feed hopper; 9. a loop pipe; 10. a delivery pipe; 11. a pressure delivery pump; 12. a control panel; 13. a feeding motor; 14. a feed screw; 15. a heat releasing pipe; 16. a junction box; 17. a base; 18. a circulation pipe; 71. a pressure cylinder; 72. a pressure sensor; 73. an upper piston; 74. hydraulic oil; 75. a lower piston; 76. a top rod; 81. a heating cavity; 82. heating wires; 83. an inner bucket.

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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 5, in the embodiment of the present invention, a plastic injection molding device with controllable melt injection pressure comprises a machine base 1, an injection molding cavity side plate 2 is arranged on one side of the upper end of the machine base 1, a charging barrel 4 is arranged on one side of the upper end of the machine base 1 close to the injection molding cavity side plate 2, an injection mold 3 is arranged inside the injection molding cavity side plate 2 and corresponding to one end of the charging barrel 4, a fixing frame 5 is arranged on one side of one end of the outer side of the charging barrel 4 close to the injection molding cavity side plate 2, a heat preservation barrel 6 is wrapped on the outer side surface of the charging barrel 4, a feeding motor 13 is connected to the other end of the charging barrel 4, a feeding hopper 8 is arranged at the position of the other end of the charging barrel 4 close to the output end of the feeding motor 13, a pressure control mechanism 7 is arranged on one side of the upper end, the front side of frame 1 is provided with controls panel 12, and the inside of feed cylinder 4 is provided with feeding screw 14, and feeding screw 14's one end is run through feed cylinder 4 and is connected with the output of feeding motor 13, and the one end of feed cylinder 4 is provided with the nozzle, and the nozzle of feed cylinder 4 one end runs through injection molding chamber curb plate 2 and is linked together with injection mold 3, conveniently with the melt of moulding plastics through the nozzle injection in injection mold 3.

The heat preservation cylinder 6 is a cylindrical structure, the inner diameter of the heat preservation cylinder 6 is matched with the outer diameter of the material cylinder 4, the heat release pipe 15 is arranged in the heat preservation cylinder 6 in a surrounding mode, one end of the heat release pipe 15 is communicated with the loop pipe 9, the other end of the heat release pipe 15 is communicated with the conveying pipe 10, the lower end of the heat preservation cylinder 6 is provided with a base 17, the heat preservation cylinder 6 is fixedly connected with the base 1 through the base 17, one end of the material cylinder 4 is fixedly connected with the base 1 through a fixing frame 5, the other end of the material cylinder 4 is fixed with the base 17 through the heat preservation cylinder 6, the injection molding cavity side plates 2 are provided with four injection molding cavity side plates 2 which are distributed in a rectangular mode and surround the upper end of the base 1 to form an injection molding cavity, the circulating pipes 18 are arranged inside the injection molding cavity side plates 2, the circulating pipes 18 penetrate through each injection molding cavity side plate 2, the circulating pipe 18 and the heat release pipe 15 are filled with cooling liquid, during operation, the melt in the material cylinder 4 is injected into the injection mold 3, and is cooled and formed through the injection mold 3, and when the melt is cooled and formed, a large amount of heat is generated to be dispersed into the injection cavity, and then heat exchange can be carried out on the large amount of heat in the injection cavity through the circulating pipe 18, heat exchange is carried out on high-temperature heat through the low-temperature high-pressure cooling liquid in the circulating pipe 18, so that the liquid cooling liquid after absorbing heat can be heated to become high-pressure gas cooling liquid, and then is conveyed into the heat release pipe 15 through the conveying pipe 10, the high-temperature high-pressure gas cooling liquid is matched with the heat release pipe 15 in the heat insulation cylinder 6 for liquefaction and heat release, so that the temperature in the heat insulation cylinder 6 can be raised, and the high-temperature high-pressure gas cooling liquid is liquefied to become low-temperature liquid, make liquid cooling liquid become high-pressure low-temperature cooling liquid and flow back again in circulating pipe 18, carry out recycling once more, on the one hand can carry out recycle to the heat that produces when injection mold 3 cooling forming in the injection cavity, and on the other hand can keep warm to feed cylinder 4, thereby avoids high-temperature melt when the feed cylinder 4, thereby the phenomenon that the heat runs off and influence the fuse-element temperature appears.

The pressure control mechanism 7 comprises a pressure cylinder 71 which is positioned at the upper end of the material cylinder 4 and penetrates through the heat preservation cylinder 6, a junction box 16 is arranged on the front surface of the pressure cylinder 71, a pressure sensor 72 is arranged at the top end of the interior of the pressure cylinder 71, an upper piston 73 is arranged at the lower end of the pressure sensor 72 in the interior of the pressure cylinder 71, a push rod 76 is connected to the upper surface of the upper piston 73, a lower piston 75 is arranged at the lower end of the upper piston 73 in the interior of the pressure cylinder 71, hydraulic oil 74 is filled between the upper piston 73 and the lower piston 75, the interior of the pressure cylinder 71 is of a hollow structure, the outer diameters of the lower piston 75 and the upper piston 73 are matched with the inner diameter of the pressure cylinder 71, the lower piston 75 and the upper piston 73 are both made of rubber materials, a push rod is arranged in the middle of the lower surface of the lower piston 75, one end of the push rod extends into the interior of the material cylinder 4, when the, the pressure in the material cylinder 4 is increased by the continuous conveying, at this time, the plunger rod moves upward under the influence of the pressure in the material cylinder 4, the plunger rod pushes the lower piston 75 to move upward, then the hydraulic oil 74 is pushed to move upward, further, the movement of the hydraulic oil 74 pushes the upper piston 73 to drive the ejector rod 76 to move upward, at this time, the ejector rod 76 pushes the pressure sensor 72, so that the pressure sensor 72 transmits a signal to the control panel 12, the control panel 12 controls the feeding motor 13 to stop rotating, so that the melt does not flow into the material cylinder 4 again, so that the melt injection pressure in the material cylinder 4 remains unchanged, after the melt in the injection mold 3 is cooled and formed (i.e. after a preset certain time), the control panel 12 automatically controls the feeding motor 13 to be positive, so that the melt pressure in the material cylinder 4 decreases, so that the plunger rod moves downward, so that the ejector rod 76 at the top end inside the pressure cylinder 71 moves downward to separate from the pressure, further, the pressure sensor 72 will transmit a signal to the control panel 12, and the control panel 12 controls the feeding motor 13 to continue to rotate forward, thereby realizing the re-circulation injection of the melt.

Hopper 83 in the inboard of feeder hopper 8 is provided with, and the inside of feeder hopper 8 is provided with heating chamber 81, and the inside lateral wall that hopper 83 was located in heating chamber 81 distributes and has a plurality of heater strips 82, and the one end of heater strip 82 is connected with control panel 12 through the wire, through the work of control heater strip 82 for the temperature in the feeder hopper 8 uprises, avoids the fuse-element when entering into feed cylinder 4 through feeder hopper 8, the problem that the fuse-element temperature runs off appears.

The working principle of the invention is as follows: in the actual working process of the invention, the temperature in the feed hopper 8 is raised by controlling the working of the heating wire 82, so that the problem of melt temperature loss when the melt enters the charging barrel 4 through the feed hopper 8 is avoided, then the high-temperature melt enters the charging barrel 4 through the feed hopper 8, the melt in the charging barrel 4 is injected into the injection mold 3 under the action of the feed screw 14, and is cooled and molded through the injection mold 3, and when the melt is cooled and molded, a large amount of heat is generated and dispersed into an injection cavity, so that the high-temperature heat is absorbed through the matching of cooling liquid in the circulating pipe 18 and is conveyed into the heat release pipe 15 through the conveying pipe 10, and the temperature in the heat preservation barrel 6 is raised through the matching of the heat release pipe 15 in the heat preservation barrel 6, on one hand, the heat preservation can be carried out on the charging barrel 4, so that the high-temperature melt is prevented from, the phenomenon that the temperature of the melt is affected due to heat loss occurs, and on the other hand, the heat generated when the injection mold 3 in the injection cavity is cooled and formed can be recycled;

when the melt is injected through the material cylinder 4, after the injection mold 3 is filled with the melt, the pressure in the material cylinder 4 is increased by continuously conveying the melt, at this time, the pressure control mechanism 7 is influenced by the pressure in the material cylinder 4 and transmits a signal to the control panel 12, the control panel 12 controls the feeding motor 13 to stop rotating, so that the melt does not flow into the material cylinder 4 again, the melt injection pressure in the material cylinder 4 is kept unchanged, after the melt in the injection mold 3 is cooled and formed, the control panel 12 automatically controls the feeding motor 13 to be inverted, and further the melt pressure in the material cylinder 4 is reduced, so the plunger rod in the pressure control mechanism 7 moves downwards, thereby the plunger rod 76 at the top end in the pressure cylinder 71 moves downwards to be separated from the pressure sensor 72, further, the pressure sensor 72 transmits a signal to the control panel 12, and the control panel 12 controls the feeding motor 13 to continue to rotate forwards, therefore, the invention realizes the recycling injection of the melt, has simple and convenient operation, controls the injection pressure of the melt in the charging barrel 4 in real time, avoids the problem of overlarge internal pressure, is automatic to operate, saves time and labor, and can recycle the heat generated when the melt in the injection mold 3 is cooled and molded by adopting the matching use of the circulating pipe 18 and the heat release pipe 15 with devices such as cooling liquid and the like, and use the recycled heat at the outer side of the charging barrel 4, so that the outer side of the charging barrel 4 keeps a certain temperature, avoids the problem of loss of the internal melt temperature caused by the overlow external temperature of the charging barrel 4, and realizes the saving and utilization of energy.

It should be noted that the feed motor 13 is of the type MCA17N23-RS0B0, and the pressure-feed pump 11 is a circulation pump of the type RS25-6, so as to prevent the pressure of the coolant in the pipeline from dropping.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A plastic injection molding device with controllable melt injection pressure comprises a machine base (1) and is characterized in that an injection molding cavity side plate (2) is arranged on one side of the upper end of the machine base (1), a material cylinder (4) is arranged on one side, close to the injection molding cavity side plate (2), of the upper end of the machine base (1), an injection mold (3) is arranged at one end, corresponding to the material cylinder (4), of the inner portion of the injection molding cavity side plate (2), a fixing frame (5) is arranged on one side, close to the injection molding cavity side plate (2), of one end of the outer side of the material cylinder (4), a heat-insulating cylinder (6) is wrapped on the outer side face of the material cylinder (4), a feeding motor (13) is connected to the other end of the material cylinder (4), a feeding hopper (8) is arranged at the position, close to the output end of the feeding motor (13), and a pressure, one end of the heat-insulating cylinder (6) is communicated with a loop pipe (9) and a conveying pipe (10) side by side, and one end of the loop pipe (9) is communicated with a pressure conveying pump (11).

2. A plastic injection molding apparatus with controllable melt injection pressure according to claim 1, wherein the front side of the base (1) is provided with a control panel (12), the feed screw (14) is disposed inside the barrel (4), and one end of the feed screw (14) penetrates through the barrel (4) and is connected to the output end of the feed motor (13).

3. A plastic injection molding apparatus with controllable melt injection pressure according to claim 1, wherein the thermal insulation cylinder (6) is of a cylindrical structure, the inner diameter of the thermal insulation cylinder (6) is adapted to the outer diameter of the material cylinder (4), the thermal insulation cylinder (6) is surrounded by a heat release pipe (15), one end of the heat release pipe (15) is connected to the loop pipe (9), and the other end of the heat release pipe (15) is connected to the delivery pipe (10).

4. A plastic injection molding apparatus with controllable melt injection pressure according to claim 1, wherein the lower end of the thermal insulation cylinder (6) is provided with a base (17), the thermal insulation cylinder (6) is fixedly connected with the base (1) through the base (17), one end of the charging barrel (4) is fixedly connected with the base (1) through the fixing frame (5), and the other end of the charging barrel (4) is fixed with the base (17) through the thermal insulation cylinder (6).

5. The plastic injection molding device with controllable melt injection pressure according to claim 1, wherein the injection molding cavity side plates (2) are provided with four injection molding cavity side plates which are distributed in a rectangular shape at the upper end of the machine base (1) to surround an injection molding cavity, the injection molding cavity side plates (2) are internally provided with circulating pipes (18), the circulating pipes (18) penetrate through each injection molding cavity side plate (2), one ends of the circulating pipes (18) are communicated with the conveying pipe (10), and the other ends of the circulating pipes (18) are communicated with the loop pipe (9) through a pressure conveying pump (11).

6. The plastic injection molding device with controllable melt injection pressure according to claim 1, wherein the pressure control mechanism (7) comprises a pressure cylinder (71) located at the upper end of the material cylinder (4) and penetrating through the heat preservation cylinder (6), the front surface of the pressure cylinder (71) is provided with a junction box (16), the top end of the inside of the pressure cylinder (71) is provided with a pressure sensor (72), the inside of the pressure cylinder (71) located at the lower end of the pressure sensor (72) is provided with an upper piston (73), the upper surface of the upper piston (73) is connected with a top rod (76), the inside of the pressure cylinder (71) located at the lower end of the upper piston (73) is provided with a lower piston (75), and hydraulic oil (74) is filled between the upper piston (73) and the lower piston (75).

7. A plastic injection molding apparatus with controllable melt injection pressure according to claim 5, wherein the pressure cylinder (71) has a hollow interior, the lower piston (75) and the upper piston (73) have outer diameters adapted to the inner diameter of the pressure cylinder (71), the lower piston (75) and the upper piston (73) are both made of rubber, the lower piston (75) has a plunger rod disposed at a middle portion of a lower surface thereof, and one end of the plunger rod extends to the interior of the barrel (4).

8. A plastic injection molding apparatus with controllable melt injection pressure according to claim 2, wherein an inner hopper (83) is disposed inside the feeding hopper (8), a heating cavity (81) is disposed inside the feeding hopper (8), a plurality of heating wires (82) are distributed inside the heating cavity (81) and located on the outer sidewall of the inner hopper (83), and one end of each heating wire (82) is connected to the control panel (12) through a wire.