CN111469351A - Injection molding system and injection molding process for anti-interference set top box shell - Google Patents
Injection molding system and injection molding process for anti-interference set top box shell Download PDFInfo
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- CN111469351A CN111469351A CN202010323531.XA CN202010323531A CN111469351A CN 111469351 A CN111469351 A CN 111469351A CN 202010323531 A CN202010323531 A CN 202010323531A CN 111469351 A CN111469351 A CN 111469351A
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- heat
- cylinder
- hopper
- heat insulation
- ring
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
- B29B13/022—Melting the material to be shaped
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
- B29B13/065—Conditioning or physical treatment of the material to be shaped by drying of powder or pellets
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/74—Heating or cooling of the injection unit
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C2045/0096—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor drying the moulding material before injection, e.g. by heating
Abstract
The invention relates to the technical field of injection molding of set top box shells, in particular to an injection molding system and an injection molding process of an anti-interference set top box shell, wherein the injection molding system comprises a feeding device, a heating device, an injection device and a mold closing device, the heating device comprises an inner charging barrel, an outer charging barrel, a heating block and a heat insulation barrel, and the heating block is arranged between the inner charging barrel and the outer charging barrel; the heat insulation cylinder is sleeved outside the outer charging cylinder, two ends of the heat insulation cylinder are respectively provided with an annular sealing plate connected with the outer charging cylinder, and the heat insulation cylinder, the outer charging cylinder and the two annular sealing plates form a sealed heat insulation cavity; the feeding device comprises a hopper and a feeding pipe, the upper end of the feeding pipe is communicated with the lower end of the hopper, and the other end of the feeding pipe is communicated with the inner material cylinder; and a heat transfer mechanism is arranged between the heat insulation cylinder and the hopper and used for transferring hot gas in the heat insulation cavity into the hopper. This injection molding system can realize the good utilization of energy among the heating device to reduce the risk of scalding the people.
Description
Technical Field
The invention relates to the technical field of injection molding of set top box shells, in particular to an injection molding system and an injection molding process of an anti-interference set top box shell.
Background
With the development of broadband networks, the application of the internet is more and more extensive, and the set top box traditionally used for the digital television auxiliary equipment is also gradually developed into an IPTV set top box capable of supporting the service functions of video on demand including digital televisions, time-shifting televisions, network browsing, information services, remote teaching and medical treatment, interactive games, and the like. At present, the shell of the set-top box is usually made of plastic, and is mainly injection molded by adopting an injection molding system.
An injection molding system, also known as an injection molding machine or an injection molding machine, is a primary molding apparatus for molding thermoplastic or thermosetting plastic into plastic products of various shapes using a plastic molding die. The injection molding system mainly comprises a feeding device, a heating device, an injection device and a mold closing device; the feeding device is used for providing plastic particles for the injection molding machine, after the feeding device supplies the plastic particles to the heating device, the heating device heats the plastic particles to a molten state, the injection device applies pressure to the molten plastic, the plastic is injected into the mold closing device, and finally the finished product is obtained through cooling and molding.
At present, a heating device in an injection molding system generally heats plastic particles to a molten state by using an electromagnetic heating mode, and chinese patent publication No. CN208576159U discloses a heating device of an injection molding system (i.e., an injection molding machine heating system for plastic particles described in the document) comprising a charging barrel, a heating block, a control module, a temperature sensor and a relay, wherein the charging barrel comprises an inner charging barrel and an outer charging barrel, and the inner charging barrel is used for containing the plastic particles; the heating block is arranged between the inner material cylinder and the outer material cylinder, and the temperature sensor, the control module, the relay and the heating block form a closed-loop real-time temperature control system. The on-off time of the heating block is controlled through the relay, and the accurate and stable control of the temperature of the charging barrel is achieved.
The above prior art solutions have the following drawbacks: the heating block among the heating device sets up between inner cylinder and outer cylinder, and the heat that the heating block produced can transmit to outer cylinder with being difficult to avoid, has the waste of energy, and the condition of scalding the people can also appear in the temperature rise of outer cylinder.
Disclosure of Invention
A first object of the present invention is to provide an injection molding system for an anti-jamming set-top box housing, which enables a good utilization of the energy in the heating device and reduces the risk of scalding people.
The above object of the present invention is achieved by the following technical solutions: an injection molding system of an anti-interference set top box shell comprises a feeding device, a heating device, an injection device and a mold closing device, wherein the heating device comprises an inner charging barrel, an outer charging barrel, a heating block and a heat insulation barrel, and the heating block is arranged between the inner charging barrel and the outer charging barrel; the heat insulation cylinder is sleeved outside the outer charging cylinder, two ends of the heat insulation cylinder are respectively provided with an annular sealing plate connected with the outer charging cylinder, and the heat insulation cylinder, the outer charging cylinder and the two annular sealing plates form a sealed heat insulation cavity; the feeding device comprises a hopper and a feeding pipe, the upper end of the feeding pipe is communicated with the lower end of the hopper, and the other end of the feeding pipe is communicated with the inner barrel; and a heat transfer mechanism is arranged between the heat insulation cylinder and the hopper and used for transferring hot gas in the heat insulation cavity into the hopper.
By adopting the technical scheme, when the heating block heats the plastic particles in the inner material cylinder, heat is transferred to the heat insulation cavity between the heat insulation cylinder and the outer material cylinder through the transmission of the outer material cylinder, the heat insulation cavity can achieve a good heat insulation effect, and meanwhile, the heat transfer mechanism is used for transferring hot air in the heat insulation cavity, so that the condition that the outer wall of the heating device is too high in temperature and scalds a person is reduced; on the other hand, heat transfer mechanism shifts steam to the hopper in, utilize steam to carry out certain preheating to the plastic granules in the hopper, treat after plastic granules gets into the feed cylinder, can corresponding reduction heat absorption get into the required absorptive heat of molten state, realize the make full use of heat energy, in addition, use steam to the in-process that plastic granules preheated in the hopper, also can promote plastic granules's degree of dryness to a certain extent, mix moisture and the condition of producing the bubble in the melting process in the reduction plastic granules.
Preferably, the heat transfer mechanism comprises a heat extraction assembly and a heat supply assembly; the heat extraction assembly comprises an exhaust fan and a heat extraction pipe, one end of the heat extraction pipe is connected to the exhaust end of the exhaust fan, and the other end of the heat extraction pipe is connected to one end of the heat insulation cylinder in the length direction and communicated with the heat insulation cavity; an air return pipe communicated with the heat insulation cavity is arranged at one end of the heat insulation cylinder, which is far away from the heat extraction pipe; the heat supply assembly comprises a heat supply piece and a heat supply pipe, the heat supply piece is arranged on the outer side wall of the hopper, a heat supply cavity is formed by the heat supply piece and the hopper, and a heat supply hole communicated with the heat supply cavity is formed in the side wall of the hopper; one end of the heat supply pipe is connected to the air outlet end of the exhaust fan, and the other end of the heat supply pipe is communicated with the heat supply cavity.
By adopting the technical scheme, hot air in the heat insulation cavity is pumped away by the exhaust fan through the heat pumping pipe, normal-temperature air is sucked from the air return pipe under the action of negative pressure in the heat insulation cavity, and heat transferred from the heat insulation cavity is continuously transferred; simultaneously, the air exhauster transmits steam to heat supply spare department through the heat supply pipe to in the heat supply hole through the hopper lateral wall with steam drum income hopper, carry out drying and preheating to the plastic granules in the hopper.
Preferably, the heat extraction assembly further comprises a heat extraction ring pipe with a hollow inner part, and the heat extraction ring pipe is connected to one end of the heat extraction pipe, which is far away from the exhaust fan, and is sleeved on the outer wall of the outer charging barrel; the heat extraction ring pipe is provided with a plurality of heat extraction holes which are evenly distributed along the circumferential direction of the heat extraction ring pipe.
Through adopting above-mentioned technical scheme, circumference sets up the heat extraction ring canal of taking out the hot hole, can promote thermal-insulated intracavity hot-air discharge efficiency, also enables thermal-insulated intracavity hot-air's discharge more evenly simultaneously.
Preferably, the heat supply piece is an annular heat supply ring, the heat supply ring is arranged on the outer side wall of the hopper in a surrounding manner, and an annular heat supply cavity is formed by the heat supply ring and the hopper; the plurality of heat supply holes are uniformly distributed on the side wall of the hopper along the annular direction of the heat supply ring.
Through adopting above-mentioned technical scheme, the annular heat supply chamber that heat supply ring and hopper lateral wall formed can supply with hot-blastly for the circumference lateral wall of hopper to through the heat supply hole air-out of evenly arranging in the hopper lateral wall, keep the good steam supply effect to hopper inner wall top plastic granules.
Preferably, the heat insulation cylinder comprises a first half cylinder and a second half cylinder which are spliced with each other, connecting plates are arranged on the opposite side edges of the first half cylinder and the second half cylinder, and the connecting plates between the first half cylinder and the second half cylinder are connected through bolts; the annular sealing plate comprises a first half ring and a second half ring which are spliced with each other, the outer annular wall of the first half ring is welded on the first half cylinder, and the outer annular wall of the second half ring is welded on the second half cylinder; the inner ring walls of the first half ring and the second half ring abut against the outer wall of the outer charging barrel, and limiting assemblies are arranged between the first half ring and the outer charging barrel and between the second half ring and the outer charging barrel and used for limiting the first half ring and the second half ring to move along the axis direction of the outer charging barrel.
By adopting the technical scheme, the first half cylinder and the second half cylinder are spliced to form the heat insulation cylinder, and are relatively fixed through the bolts, so that the heat insulation cylinder and the charging cylinder are conveniently installed; meanwhile, the first half ring and the second half ring are limited to move along the axis direction of the outer charging barrel by utilizing the limiting assemblies between the first half ring and the outer charging barrel and between the second half ring and the outer charging barrel, so that the connection stability of the heat insulation barrel and the outer charging barrel is kept.
Preferably, the inner annular walls of the first half ring and the second half ring are provided with arc abutting plates, and the arc abutting plates are abutted and matched with the outer wall of the outer charging barrel; the limiting assembly comprises a limiting convex edge, the limiting convex edge is arranged on the outer wall of the outer charging barrel along the circumferential direction of the outer charging barrel, and the arc-shaped butt plate is provided with a limiting groove matched with the limiting convex edge in an inserting mode.
By adopting the technical scheme, the arrangement of the arc abutting plate can increase the abutting area of the first half ring and the second half ring on the outer wall of the outer charging barrel, and can form good support for the installed heat insulation barrel; meanwhile, the first half ring and the second half ring are limited to move along the axial direction of the outer charging barrel by the insertion fit between the limiting convex edge and the limiting groove, and the effect of keeping the connection stability of the heat insulation barrel and the outer charging barrel is achieved.
Preferably, the outer wall of the heat insulation cylinder is coated with aerogel felt heat insulation cloth.
Through adopting above-mentioned technical scheme, aerogel felt heat-insulating cloth has good thermal-insulated effect, can reduce during heat transmits to operational environment's air from thermal-insulated section of thick bamboo to reduce the circumstances that operational environment air temperature rises.
A second object of the invention is to provide an injection molding process for an anti-jamming set-top box housing, which enables a good utilization of the energy in the heating device.
The above object of the present invention is achieved by the following technical solutions: an injection molding process of an anti-interference set top box shell comprises the following steps:
s1, preheating the inner charging barrel by using the heating block, and simultaneously starting the heat transfer mechanism to transfer heat transferred to the heat insulation cavity in the heating process into the hopper;
s2, after the temperature in the charging barrel reaches the preset temperature, feeding plastic particles into the inner charging barrel through the hopper, and heating the inner charging barrel to enable the plastic particles to be in a molten state;
and S3, injecting the molten plastic into the mold of the mold closing device by using an injection device, cooling the mold to mold the product, and taking out the product when the temperature of the mold is reduced to 40-60 ℃.
Through adopting above-mentioned technical scheme, heat transfer mechanism transfers the heat transfer in with the heating process to the thermal-insulated intracavity to the hopper, utilizes steam to carry out drying and preheating to the plastic granules in the hopper, realizes the make full use of heat energy.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the hot gas in the heat insulation cavity is transferred into the hopper by using the heat transfer mechanism, so that the condition that the temperature of the outer wall of the heating device is overhigh and scalds people is reduced, and the hot gas is used for drying and preheating the plastic particles in the hopper, so that the full utilization of heat energy is realized;
2. the heat extraction ring pipe with the heat extraction holes in the circumferential direction can improve the heat air discharge efficiency in the heat insulation cavity and ensure that the heat air in the heat insulation cavity is discharged more uniformly;
3. the heat insulation cylinder and the annular sealing plate are of two-half structures, so that the heat insulation cylinder and the annular sealing plate can be conveniently arranged on the outer charging cylinder.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.
Fig. 2 is a schematic view of an assembly structure of a feeding device, a heating device and a heat transfer mechanism in an embodiment of the invention.
Fig. 3 is a schematic horizontal sectional view of a heating apparatus in an embodiment of the present invention.
FIG. 4 is a schematic view showing an assembly structure of the heat insulating cylinder and the outer cylinder in the embodiment of the present invention.
Fig. 5 is a schematic vertical section of a feeding device according to an embodiment of the invention.
Reference numerals: 1. a feeding device; 11. a hopper; 11a, a heat supply hole; 12. a feed pipe; 2. a heating device; 21. an inner barrel; 22. an outer barrel; 22a, a limit convex edge; 23. a heating block; 24. a heat insulating cylinder; 241. a first half cylinder; 242. a second half cartridge; 243. a connecting plate; 25. an annular seal plate; 251. a first half ring; 252. a second half ring; 253. an arc abutting plate; 253a and a limit groove; 26. a thermally insulating cavity; 26a, an air return pipe; 3. an injection device; 4. a mold clamping device; 5. a heat transfer mechanism; 51. a heat extraction assembly; 511. a heat pumping ring pipe; 511a and heat extraction holes; 512. a heat pumping pipe; 513. an exhaust fan; 52. a heat supply assembly; 521. a heat supply ring; 521a, a heat supply cavity; 522. a heat supply pipe.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
referring to fig. 1, the injection molding system for the anti-interference set top box shell disclosed by the invention comprises a feeding device 1, a heating device 2, an injection device 3 and a mold closing device 4, wherein the feeding device 1 is used for providing plastic particles for the heating device 2, and the heating device 2 is used for heating the plastic particles to a molten state; referring to fig. 2, the heating device 2 and the feeding device 1 are further provided with a heat transfer mechanism 5 for transferring heat dissipated from the heating device 2 to the feeding device 1 to dry and preheat the plastic particles in the heating device 2.
Referring to fig. 2, the feeding device 1 includes a hopper 11 and a feeding pipe 12, wherein the upper end of the hopper 11 is cylindrical and the lower end is a circular hopper with a horizontal section gradually decreasing downward; feed pipe 12 is vertical pipe, and the upper end of feed pipe 12 is connected with the lower extreme of hopper 11.
Referring to fig. 2 and 3, the heating device 2 includes an inner cylinder 21, an outer cylinder 22, a heating block 23, and an insulation cylinder 24, wherein the outer cylinder 22 is installed outside the inner cylinder 21, and the centerline axis of the outer cylinder 22 is the same as that of the inner cylinder 21. Meanwhile, a cavity is formed between the outer material cylinder 22 and the inner material cylinder 21, and the heating block 23 is arranged in the cavity between the inner material cylinder 21 and the outer material cylinder 22; specifically, the heating block 23 is fixedly sleeved on the outer side wall of the inner cylinder 21, and a gap is formed between one side of the heating block 23, which is far away from the inner cylinder 21, and the inner side wall of the outer cylinder 22, so that the situation that the heating block 23 directly transfers heat from the outer cylinder 22 to the outside can be reduced.
Referring to fig. 3, the heat insulation cylinder 24 is sleeved outside the outer cylinder 22, and an inner wall of the heat insulation cylinder 24 and an outer wall of the outer cylinder 22 have a gap; meanwhile, the two ends of the heat insulation cylinder 24 are both provided with the annular sealing plates 25, the heat insulation cylinder 24 is connected with the outer charging cylinder 22 through the annular sealing plates 25, and the heat insulation cylinder 24, the outer charging cylinder 22 and the two annular sealing plates 25 can also form a heat insulation cavity 26 for reducing heat transfer. In addition, the outer wall of the heat insulation cylinder 24 may be covered with a layer of aerogel felt heat insulation cloth (not shown in the figure) for reducing the heat transfer from the heat insulation cylinder 24 to the outside.
Referring to fig. 4, in order to facilitate installation between the heat insulation cylinder 24 and the outer material cylinder 22, specifically, the heat insulation cylinder 24 includes a first half cylinder 241 and a second half cylinder 242 which are mutually spliced, connecting plates 243 are welded to opposite side edges of the first half cylinder 241 and the second half cylinder 242, and the connecting plates 243 of the first half cylinder 241 and the second half cylinder 242 are connected by bolts. Meanwhile, the annular sealing plate 25 includes a first half ring 251 and a second half ring 252 which are spliced with each other, wherein the outer annular wall of the first half ring 251 is welded to the first half cylinder 241, and the outer annular wall of the second half ring 252 is welded to the second half cylinder 242; moreover, arc abutting plates 253 are fixedly installed on the inner annular walls of the first half ring 251 and the second half ring 252, and the two arc abutting plates 253 are spliced together to form a circular ring matched with the outer wall of the outer cylinder 22.
Referring to fig. 4, the inner arc surfaces of the two arc abutting plates 253 are both provided with a limiting groove 253a, and correspondingly, the outer wall of the outer material cylinder 22 is circumferentially provided with an annular limiting convex edge 22 a; when the arc abutting plate 253 abuts against the outer wall of the outer barrel 22, the limiting convex edge 22a is inserted into the limiting groove 253 a. Meanwhile, a sealing rubber strip (not shown in the figure) is further bonded to the bottom of the limiting groove 253a and used for improving the sealing performance of the annular sealing ring after the annular sealing ring is connected with the outer charging barrel 22. In addition, in order to maintain the sealing performance between the heat insulation cylinder 24 and the outer cylinder 22, elastic sealing gaskets (not shown) may be installed between the two connecting plates 243 connected to each other and between the abutting ends of the first half ring 251 and the second half ring 252.
Referring to fig. 2 and 3, the heat transfer mechanism 5 is installed between the heat insulation cylinder 24 and the hopper 11, and specifically, the heat transfer mechanism 5 includes a heat extraction assembly 51 and a heat supply assembly 52. Wherein, the heat extraction assembly 51 is used for extracting hot air from the heat insulation cylinder 24, referring to fig. 3 and 4, the heat extraction assembly 51 comprises a heat extraction loop 511, a heat extraction pipe 512 and a suction fan 513; the heat extraction ring pipe 511 is a hollow ring pipe, the heat extraction ring pipe 511 is sleeved at one end of the outer material cylinder 22 in the length direction, and the heat extraction ring pipe 511 is provided with a plurality of heat extraction holes 511a along the circumferential direction of the heat extraction ring pipe 511. Correspondingly, an air return pipe 26a is communicated with the side wall of one end of the heat insulation cylinder 24 far away from the heat extraction annular pipe 511. One end of the heat-pumping pipe 512 is connected to the heat-pumping annular pipe 511, and the other end thereof penetrates through the side wall of the heat-insulating cylinder 24; the exhaust end of the exhaust fan 513 is connected to the end of the heat extraction pipe 512 far away from the heat extraction loop 511, and the hot air in the insulating cavity 26 is extracted by the exhaust fan 513.
Referring to fig. 2 and 5, the heating assembly 52 is for supplying hot gas extracted by the exhaust fan 513 into the hopper 11, and in particular, the heating assembly 52 includes a heating member and a heating pipe 522; wherein, the heat supply member is an annular heat supply ring 521, the heat supply ring 521 is fixedly installed on the outer side wall of the lower end of the hopper 11, and an annular heat supply cavity 521a is formed between the heat supply ring 521 and the side wall of the hopper 11. Correspondingly, a plurality of heat supply holes 11a are uniformly formed in the side wall of the hopper 11 along the annular direction of the heat supply ring 521, and the heat supply holes 11a are communicated with the heat supply cavity 521 a. One end of the heat supply pipe 522 is connected to the air outlet end of the exhaust fan 513, and the other end is communicated with the heat supply chamber 521 a. The heat is transferred to the heat supply chamber 521a of the heat supply ring 521 through the heat supply pipe 522 by the exhaust fan 513, and then the hot air is supplied into the hopper 11 through the heat supply hole 11a on the sidewall of the hopper 11, so as to dry and preheat the plastic particles in the hopper 11.
Referring to fig. 1, after the heating mechanism heats the plastic particles to a molten state, the injection mechanism applies pressure to the molten plastic, the plastic is injected into the mold clamping mechanism, and finally, the plastic is cooled and molded to obtain a finished product. In this embodiment, the heating mechanism, the injection mechanism and the mold clamping mechanism are all the prior art, and are not described herein again.
The implementation principle of the embodiment is as follows: when the heating block 23 heats the plastic particles in the inner charging barrel 21, the heat is transferred to the heat insulation cavity 26 between the heat insulation barrel 24 and the outer charging barrel 22 through the outer charging barrel 22, the heat insulation cavity 26 can achieve a good heat insulation effect, and meanwhile, the heat transfer mechanism 5 is used for transferring the hot air in the heat insulation cavity 26, so that the situation that the outer wall of the heating device 2 is too high in temperature and scalds people is reduced; on the other hand, heat transfer mechanism 5 shifts steam to in hopper 11, utilize steam to carry out certain preheating to the plastic granules in the hopper 11, treat after plastic granules gets into the feed cylinder, can corresponding reduction heat absorption get into the required absorptive heat of molten state, realize the make full use of heat energy, in addition, use the in-process that steam preheats plastic granules in to hopper 11, also can promote plastic granules's degree of dryness to a certain extent, mix moisture and the condition of producing the bubble in the melting process in the reduction plastic granules.
Example two.
The invention discloses an injection molding process of an anti-interference set top box shell, which comprises the following steps:
s1, preheating the inner material barrel 21 by using the heating block 23, and simultaneously starting the heat transfer mechanism 5 to transfer heat transferred to the heat insulation cavity 26 in the heating process into the hopper 11;
s2, after the temperature in the charging barrel reaches the preset temperature, feeding plastic particles into the inner charging barrel 21 through the hopper 11, and heating the inner charging barrel 21 to enable the plastic particles to be in a molten state;
and S3, injecting the molten plastic into the mold of the mold closing device 4 by using the injection device 3, cooling the mold to mold the product, and taking out the product when the temperature of the mold is reduced to 40-60 ℃.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. The utility model provides an injection molding system of anti-interference STB shell, includes feedway (1), heating device (2), injection unit (3) and MOLD CLAMPING APPARATUS (4), its characterized in that: the heating device (2) comprises an inner charging barrel (21), an outer charging barrel (22), a heating block (23) and a heat insulation barrel (24), wherein the heating block (23) is arranged between the inner charging barrel (21) and the outer charging barrel (22);
the heat insulation cylinder (24) is sleeved outside the outer charging cylinder (22), two ends of the heat insulation cylinder (24) are respectively provided with an annular sealing plate (25) connected with the outer charging cylinder (22), and a sealed heat insulation cavity (26) is formed by the heat insulation cylinder (24), the outer charging cylinder (22) and the two annular sealing plates (25);
the feeding device (1) comprises a hopper (11) and a feeding pipe (12), the upper end of the feeding pipe (12) is communicated with the lower end of the hopper (11), and the other end of the feeding pipe is communicated with the inner barrel (21);
and a heat transfer mechanism (5) is arranged between the heat insulation cylinder (24) and the hopper (11) and is used for transferring hot gas in the heat insulation cavity (26) into the hopper (11).
2. The injection molding system of the anti-tamper set-top box housing of claim 1, wherein: the heat transfer mechanism (5) comprises a heat extraction assembly (51) and a heat supply assembly (52);
the heat extraction assembly (51) comprises an exhaust fan (513) and a heat extraction pipe (512), one end of the heat extraction pipe (512) is connected to the air extraction end of the exhaust fan (513), and the other end of the heat extraction pipe (512) is connected to one end of the heat insulation cylinder (24) in the length direction and communicated with the heat insulation cavity (26);
an air return pipe (26a) communicated with the heat insulation cavity (26) is arranged at one end, far away from the heat extraction pipe (512), of the heat insulation cylinder (24);
the heat supply assembly (52) comprises a heat supply piece and a heat supply pipe (522), the heat supply piece is arranged on the outer side wall of the hopper (11), a heat supply cavity (521a) is formed by the heat supply piece and the hopper (11), and a heat supply hole (11a) communicated with the heat supply cavity (521a) is formed in the side wall of the hopper (11);
one end of the heat supply pipe (522) is connected with the air outlet end of the exhaust fan (513), and the other end of the heat supply pipe is communicated with the heat supply cavity (521 a).
3. The injection molding system of the anti-tamper set-top box housing of claim 2, wherein: the heat extraction component (51) further comprises a heat extraction ring pipe (511) with a hollow interior, and the heat extraction ring pipe (511) is connected to one end, away from the exhaust fan (513), of the heat extraction pipe (512) and sleeved on the outer wall of the outer charging barrel (22);
the heat extraction ring pipe (511) is provided with a plurality of heat extraction holes (511a), and the heat extraction holes (511a) are uniformly distributed along the circumferential direction of the heat extraction ring pipe (511).
4. An injection molding system for a tamper resistant set top box housing according to claim 2 or 3, wherein: the heat supply part is an annular heat supply ring (521), the heat supply ring (521) is arranged on the outer side wall of the hopper (11) in an enclosing manner, and an annular heat supply cavity (521a) is formed by the heat supply ring and the hopper (11);
the plurality of heat supply holes (11a) are uniformly distributed on the side wall of the hopper (11) along the annular direction of the heat supply ring (521).
5. The injection molding system of the anti-tamper set-top box housing of claim 1, wherein: the heat insulation cylinder (24) comprises a first half cylinder (241) and a second half cylinder (242) which are spliced with each other, connecting plates (243) are arranged on the opposite side edges of the first half cylinder (241) and the second half cylinder (242), and the connecting plates (243) between the first half cylinder (241) and the second half cylinder (242) are connected through bolts;
the annular sealing plate (25) comprises a first half ring (251) and a second half ring (252) which are spliced with each other, the outer annular wall of the first half ring (251) is welded on the first half cylinder (241), and the outer annular wall of the second half ring (252) is welded on the second half cylinder (242);
the inner ring walls of the first half ring (251) and the second half ring (252) are abutted to the outer wall of the outer charging barrel (22), and limiting components are arranged between the first half ring (251) and the outer charging barrel (22) and between the second half ring (252) and the outer charging barrel (22) and used for limiting the first half ring (251) and the second half ring (252) to move along the axis direction of the outer charging barrel (22).
6. The injection molding system of the anti-tamper set-top box housing of claim 5, wherein: the inner annular walls of the first half ring (251) and the second half ring (252) are respectively provided with an arc abutting plate (253), and the arc abutting plates (253) are abutted and matched with the outer wall of the outer charging barrel (22);
the spacing subassembly includes spacing protruding edge (22a), the outer wall of outer feed cylinder (22) is located along outer feed cylinder (22) circumferencial direction along spacing protruding edge (22a), arc butt joint board (253) are equipped with spacing protruding edge (22a) grafting complex spacing recess (253 a).
7. The injection molding system of the anti-tamper set-top box housing of claim 1, wherein: the outer wall of the heat insulation cylinder (24) is coated with aerogel felt heat insulation cloth.
8. An injection molding process of an anti-interference set top box shell is characterized in that: the method comprises the following steps:
s1, preheating the inner material barrel (21) by using the heating block (23), starting the heat transfer mechanism (5) at the same time, and transferring the heat transferred to the heat insulation cavity (26) in the heating process into the hopper (11);
s2, after the temperature in the charging barrel reaches the preset temperature, feeding plastic particles into the inner charging barrel (21) through the hopper (11), and heating the inner charging barrel (21) to enable the plastic particles to be in a molten state;
and S3, injecting the molten plastic into the mold of the mold closing device (4) by using the injection device (3), cooling the mold to mold the product, and taking out the product when the temperature of the mold is reduced to 40-60 ℃.
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