CN101474855B - Liquid phase heating constant temperature system of injection mould device - Google Patents
Liquid phase heating constant temperature system of injection mould device Download PDFInfo
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- CN101474855B CN101474855B CN2008101207259A CN200810120725A CN101474855B CN 101474855 B CN101474855 B CN 101474855B CN 2008101207259 A CN2008101207259 A CN 2008101207259A CN 200810120725 A CN200810120725 A CN 200810120725A CN 101474855 B CN101474855 B CN 101474855B
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- oil
- constant temperature
- temperature
- injection moulding
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- 238000002347 injection Methods 0.000 title claims abstract description 37
- 239000007924 injection Substances 0.000 title claims abstract description 37
- 238000010438 heat treatment Methods 0.000 title claims abstract description 13
- 239000007791 liquid phase Substances 0.000 title claims description 11
- 239000003921 oil Substances 0.000 claims abstract description 95
- 238000001746 injection moulding Methods 0.000 claims abstract description 42
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 17
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 17
- 239000010703 silicon Substances 0.000 claims abstract description 17
- 229920002545 silicone oil Polymers 0.000 claims description 10
- 125000003003 spiro group Chemical group 0.000 claims description 4
- 239000012774 insulation material Substances 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 239000011344 liquid material Substances 0.000 abstract 1
- 239000012778 molding material Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 23
- 238000001816 cooling Methods 0.000 description 6
- 238000009413 insulation Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000002277 temperature effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 239000010724 circulating oil Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 235000013569 fruit product Nutrition 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000010734 process oil Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
- 230000028016 temperature homeostasis Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2737—Heating or cooling means therefor
- B29C45/2738—Heating or cooling means therefor specially adapted for manifolds
Abstract
The invention relates to a heating thermostatical system for an injection molding device, in particular to a system for thermostatical and temperature control through liquid material of heat conducting silicon oil in a material cylinder of injection molding equipment and a hot flow passage pouring gate of an injection mold. The system comprises a heat conducting silicon oil pool, a temperature control system, and an injection molding device, wherein silicon oil in the heat conducting silicon oil pool forms a hydraulic loop via an oil pump and oil passage thermostatic apparatuses in various sections in the injection molding device; the temperature control system controls the oil temperature of the hydraulic loop according to the temperature requirements of each section in the injection molding device; and the circumferences of an injection molding material cylinder, an injection molding head, a mold pouring gate and the like are provided with certain silicon oil passages, so that the temperature of a pouring gate area reaches a required temperature and material blockage is completely avoided. The system has the advantages of low power loss of the oil passages, good heat conductivity and constant temperature.
Description
Technical field
The present invention relates to heating and constant temperature system in a kind of injection moulding apparatus; Especially in a kind of heat flow passage sprue of barrel, the injection mold in injection-moulding device, adopt the liquid of heat conduction silicone oil to carry out the liquid phase heating and the constant temperature system of constant temperature and temperature controlled a kind of injection moulding apparatus.
Background technology
In injection machine equipment, the used mold heated hot flow path device of the barrel of injection machine and injection moulding adopts heating wire or coil heats more at present, during the electrically-heated coil heating, because of electrode exposes easy electric shock; Gently then tripping operation, heavy then cause personnel's accident, there is contact gap in electrically-heated coil because of the barrel outer wall again; Poor thermal efficiency causes energy waste, and has many structural obstructs between electrically-heated coil and the barrel; It is slow and inhomogeneous that heat is transmitted, and also has around the electric heating coil structures shape barrel inevitable complicatedly and take up space greatlyyer, is difficult to reach delicate structure; When electrically-heated coil burnt out, maintain and replace bothered more, and whole winding is scrapped together with mould gate often.Different industries adopts electrically-heated coil and fluent material heats and the mode of thermostatic effect is various.
It like the patent No. 200520036378.3 rubber injection machine constant temperature system; Respectively be provided with heater extruding unit and injecting unit, the cooling medium pipe of cooling system inserts Unit two simultaneously, on Unit two, thermo detector is housed; What heater adopted is electrically-heated coil, and what cooling system was used is water; Like the patent No. is 200580048969.5 to relate to a kind of system that regulates the printer part temperature by means of cooling device; Cooling device is at first output; For first of constant temperature agent is supplied with constant temperature agent that closed circuit provides the preferred temperature level to the parts that need carry out constant temperature; Wherein cooling device has first cooling procedure that has the liquid circulation; The design of this liquid circulation is the temperature levels that a kind of constant temperature agent is cooled to below environment temperature or room temperature, and this is that a kind of liquid that utilizes cools off the work design with heat exchange.
And for example the patent No. is that 200410073945.2 invention provides a kind of constant temperature liquid crculating apparatus; Realize through the insulation that is housed in the isothermal liquid in the container after the adjustment and the adjustment of liquid level in the identical space that this constant temperature liquid crculating apparatus utilizes around container to form; Can remove heat-barrier material from container; Make the whole miniaturization and of device; The integral body of primary tank of accommodating the isothermal liquid of being crossed by the thermoregulation mechanism adjustment is so that exist the mode as the space of thermal insulation layer to be bearing in the secondary container around it; In primary tank, supply with between the space in the secondary container and the discharge isothermal liquid with being formed on simultaneously by level adjusting mechanism; Thus, utilize the insulation and liquid level adjustment of the isothermal liquid that identical space in the secondary container realizes accommodating in the primary tank, this invention has certain effect to the insulation adjusting of the isothermal liquid of accommodating in the container.
The patent No. is the liquid constant temperature equipment that 02228990.9 utility model belongs to the precision finishing machine adapted for another example, is provided with refrigeration machine, electrothermal tube, oil pump, pipeline, liquid sucting port, liquid outlet and electrical apparatus control circuit in its casing, is provided with unitized exchanger in the casing; It is two-layer inside and outside heat exchanger has; Electrothermal tube is arranged on internal layer, and the evaporation tube of refrigeration machine is arranged on skin, is the close passage of liquid flow in the heat exchanger; Its purpose is to make liquid keep constant temperature; Guarantee the machining accuracy of precision machine tool, its shortcoming just is that electrothermal tube is arranged on internal layer, to safeguarding and change the electrothermal tube inconvenience.
Also be 96201414.1 1 kinds and in the casket body, heater be housed just like the patent No.; The general liquid thermostat that temperature controller and magnet pump constituted; Be temperature-sensing probe to be housed and to pass through lead to link to each other with temperature controller on heater, magnet pump links to each other with heater through pipeline, and liquid in-out pipe front end is equipped with filter; It can carry out constant temperature to various liquid, is worth really quoting as a heated at constant temperature system.
Summary of the invention
The objective of the invention is in order to solve in the injection moulding industry; The cast gate in the injection moulding process mould and the thermostat of auxiliary equipment cause electric leakage, poor thermal efficiency, the big complicacy of structure, maintenance and repair not only inconvenience but also wasting problem because of adopting electrical bar or coil heats; Provide a kind of safe and reliable, the thermal efficiency is high, the heat flow passage sprue of compact conformation, easy to maintenance, the barrel in injection-moulding device, injection mold; Adopt the liquid of heat conduction silicone oil to carry out constant temperature and control, and in injection-molded item, mould the liquid phase heating constant temperature system that the cast gate place does not produce the injection moulding apparatus of cast gate with temperature.
The technical solution adopted for the present invention to solve the technical problems is: this device comprises thermal conductive silicon oil sump, temperature control system, injection moulding apparatus, and each section oil circuit thermostat that the silicone oil in the thermal conductive silicon oil sump is provided with in oil pump, injection moulding apparatus is formed hydraulic circuit, and temperature control system is by the oil temperature of each its hydraulic circuit of zone temperatures requirement control in the injection moulding apparatus; There is the several segments temperature requirement can establish several temperature control branch systems, in injection moulding process, the temperature required difference of material different; Also have any different in that segments of different is temperature required with a kind of material, the oil circuit temperature is controlled 100～300 ℃ of range regulation, and each components and parts, oil pipe design temperature all will be more than temperature required; To guarantee service life; The barrel of injection moulding, mould gate are that emphasis of the present invention solves the place of stopping up clout, adopt the low silicone oil of surface tension, have antiseized, wetting, levelling, characteristics that spreadability is good; Make the mobile power attenuation of oil circuit of native system low; Thermal conductivity is good, and keeps temperature constant relatively, so in liquid circulating apparatus; We are around injection moulding barrel, injection head, mould gate etc.; Be arranged to certain silicone oil passage, reach temperature required, avoid stifled buildup fully to realize the gate area temperature.
As preferably, described injection moulding apparatus comprises barrel district, injection Head Section, mould district, and these three regional general appearances are made as round shape; Be right after each other, the front end in barrel district is connected with an end of injection Head Section, and the other end of injection Head Section is connected with the mould district; Material begins to be heated in the barrel district, and promptly plasticizing process is got into injection head then; Injection head injects mould, is dispensed in each product mould by mould inside material road.
As preferably, the middle part in described barrel district is a feeding spiro rod, also can be the pay-off form of other form; The afterbody in barrel district connects charging aperture, and according to operational characteristic, barrel is distinguished into three constant temperature zones; Preceding constant temperature zone is provided with leading portion oil-in, leading portion oil return opening, forms a leading portion oil circuit, and middle constant temperature zone is provided with stage casing oil-in and stage casing oil return opening; Form a stage casing oil circuit, same, back constant temperature zone is provided with back segment oil-in, back segment oil return opening; Become the back segment oil circuit, three zones can respectively be provided with a thermostatic control system, and each circulating oil path can be processed helical form, back-shaped shape etc. to oil pipe along each profile; It is outside to be wrapped in the barrel district, or is sequentially arranged in the outside in barrel district, the auxilliary again heat-insulation layer of establishing in outside.
As preferably, described injection Head Section is provided with oil-in No. 4, and No. 4 oil return openings form a silicone oil loop, and the spiral or back-shaped shape of oil line pipe twines the auxilliary outside that is located at injection head, the auxilliary again dress insulation material of also available other auxilliary equipment, method, skin.
As preferably, described mould district is provided with oil-in No. 9, No. 9 oil return openings; By its temperature required temperature control branch system of establishing separately, be provided with the oil pipe road along the material passing tube road in the mould district, when being particularly suitable in the same mould a plurality of product, this mode makes; Oil-in and oil return opening can be made into same standard; When making different product, exchange with different mould interface, if the single-piece injection moulding, or the single product pipelining; This mould district can not establish the oil circuit constant temperature system, and material is directly injected in the mould by injection head and is moulded product.
As preferably, be provided with the switch door between described injection Head Section and the mould district, this device of design is also arranged in the prior art; Different is that electrical bar heated constant temperature effect is relatively poor, and discharging opening often carries a small amount of clout and gathers, and keeping away in the product unavoidably has the clout cast gate to produce; And the constant temperature effect of silicone oil is good, and injection head and mould mouth do not have buildup, and the switch door can adopt Numeric Control Technology fully; And with barrel in squeezer control system interlock, can not produce the clout cast gate on the product.
As preferably; Being provided with several minutes oil sump in the described thermal conductive silicon oil sump, mainly is the different temperatures requirement according to oil piping system, and its oil circuit number confirms to divide the number of oil sump; The quantity of heater, Wen Xianyi, fuel contents gauge, oil pump sets with dividing oil sump; As needing 270 ℃, 290 ℃ two kinds of temperature carry out constant temperature work simultaneously in the oil circuit zones of different, then establish the oil pump, heater of two oil circuits etc., the oil temperature in the thermal conductive silicon oil sump is regulated control by temperature control system is unified.
As preferably, the gauge tap of described temperature control system, oil pump, Wen Xianyi, switch door etc. concentrates on console, for easy to operate, is convenient to management, and whole system can adopt computer control system.
Shortcoming of the present invention is though the pressure of hydraulic system is very little, certain temperature to be arranged, components and parts such as each oil circuit joint and pipeline requirement temperature tolerance, sealing height.
Therefore, the present invention is a reasonable in design, and is easy to operate, and the thermal efficiency is high, and is easy to maintenance, do not produce cast gate in the injection-molded item, the liquid phase heating constant temperature system of the injection moulding apparatus that integrated cost is low.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is a system architecture sketch map of the present invention.
Fig. 2 is an injection moulding apparatus barrel injection head structural representation of the present invention.
Fig. 3 is an injection moulding apparatus mould structure sketch map of the present invention.
Among the figure: 1. thermal conductive silicon oil sump, 2. temperature control system, 21. heaters, 3. injection moulding apparatus, 4. injection Head Section, No. 41.4 oil-ins, No. 42.4 oil return openings; 5. switch door, 6. product, 7. barrel district, 71. leading portion oil-ins, 72. leading portion oil return openings, 73. stage casing oil-ins; 74. the stage casing oil return opening, 75. back segment oil-ins, 76. back segment oil return openings, 8. charging aperture, 9. mould district, No. 91.9 oil-ins; 92.9 number oil return opening, 93. oil pipe roads, 94. material passing tube roads, 95. single-piece moulds, 10. feeding spiro rod, 11. oil pumps.
The specific embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically technical scheme of the present invention.
Embodiment one: in Fig. 1, Fig. 2, Fig. 3, during 5 identical products 6 of injection moulding, make one pair of mould district 9; In establish a cylindrical material passage 94, and be divided into 5 injection port to products 6, around material channel 94, process oil pipe road 93; Attention is arranged at the oil duct of each oil circuit joint and elbow; Guarantee that mould district 9 interior material channels 94 can both be heated and evenly, mould district 9 establishes 91, No. 9 oil return openings 92 of one No. 9 oil-ins on every side.
The charging aperture in mould district 9 with the injection Head Section 4 join, between establish an electric-controlled switch door 5.
The profile of injection Head Section 4 is set as cylindrical, conduit under fluid pressure on columniform outside the winding, and curl is established 41, No. 4 oil return opening 42, two hydraulic fluid ports of one No. 4 oil-ins and is joined with hydraulic system respectively.
The barrel district was set as three parts in 7 minutes; Establish a leading portion oil-in 71 and leading portion oil return opening 72 with the leading portion that joins of injection Head Section 4, interlude is established a stage casing oil-in 73 and stage casing oil return opening 74, establishes a back segment oil-in 75 and back segment oil return opening 76 with charging aperture 8 end that joins; Each hydraulic fluid port links with corresponding hydraulic system interface respectively; The barrel district center is the feeding spiro rod 10 in the injection-moulding device, and material melting heat wherein just comes in the silicone oil conduit under fluid pressure, and three zones in barrel district 7 are controlled separately.
Be set as five branch oil sumps in the thermal conductive silicon oil sump 1; Its three zones, back in mould district 9, injection Head Section 4, barrel district 7 preceding; Fixing heater 21, oily temperature display instrument and an oil pump 11 in each oil sump, heater 21 adopts heating rod, and the two poles of the earth of each heating rod are connected with the operating desk electric-controlled switch respectively; Assembling oil ga(u)ge, filter etc. in each oil sump; Each minute in the thermal conductive silicon oil sump 1, the oil temperature in the oil sump recorded data through oily temperature display instrument, and when temperature is lower than temperature requiredly, heating rod heats automatically.
When work, be PET like material, the temperature in mould district 9 is controlled at 290 ℃ ± 3 ℃; Temperature at injection Head Section 4 is controlled at 280 ℃ ± 3 ℃; The front-end temperature in barrel district 7 is controlled at 290 ℃ ± 3 ℃, and the stage casing regional temperature is 280 ℃ ± 3 ℃, and the back segment temperature is 270 ℃ ± 3 ℃.
Silicone oil select for use XHG-378 (DC-5211, silwet-77), surface tension < 21mN/>m.
During temperature control system 2 designs, establish Wen Xianyi, oil pressure appearance etc. at main temperature control point, data centralization comes into plain view, so that the control system at master operating station.
Embodiment two: the single products pipelining, and as shown in Figure 4, directly join product mold with the injection head of injecting Head Section 4; Establish a switch door 5 between them; Single-piece mould 95 adopts automatic folding to unload the finished product structure, and the hydraulic pressure heated at constant temperature system in injection Head Section 4 and barrel district 7 is identical with embodiment one, need not to change; Like the fruit product injection temperature at 150 ℃, as long as control to injection a Head Section 4, the leading portion in barrel district 7, stage casing, the trizonal adjustment of back segment identical.
Because the pressure of the hydraulic system oil circuit hydraulic pressure among the present invention is little,, in the injection moulding industry, has practical significance so be heatproof what mainly consider aspect the hydraulic pressure components and parts.
The foregoing description is to explanation of the present invention, is not to qualification of the present invention, any structure after the simple transformation of the present invention is all belonged to protection scope of the present invention.
Claims (6)
1. the liquid phase of an injection moulding apparatus heats and constant temperature system; Comprise thermal conductive silicon oil sump (1), temperature control system (2), injection moulding apparatus (3); It is characterized in that each section oil circuit thermostat composition hydraulic circuit that the silicone oil in the described thermal conductive silicon oil sump (1) is provided with in oil pump (11), injection moulding apparatus (3), temperature control system (2) is by the oil temperature of each its hydraulic circuit of zone temperatures requirement control in the injection moulding apparatus (3), and injection moulding apparatus (3) comprises barrel district (7), injection Head Section (4), mould district (9); Mould district (9) is provided with No. 9 oil-ins (91); Be provided with oil pipe road (93) along material passing tube road (94) in No. 9 oil return openings (92), mould district (9), be provided with switch door (5) between injection Head Section (4) and mould district (9); The thermal conductive silicon oil sump is provided with several minutes oil sump in (1), the number that the oil circuit number that requires according to the different temperatures of oil piping system confirms to divide oil sump.
2. the liquid phase of injection moulding apparatus according to claim 1 heats and constant temperature system; It is characterized in that barrel district (7), injection Head Section (4), mould district (9) that described injection moulding apparatus (3) is provided with; Three zones respectively are provided with the constant temperature circulatory system; The front end in barrel district (7) is connected with an end of injection Head Section (4), and the other end of injection Head Section (4) is connected with mould district (9).
3. the liquid phase of injection moulding apparatus according to claim 1 and 2 heats and constant temperature system; It is characterized in that middle part, described barrel district (7) is feeding spiro rod (10); Afterbody connects charging aperture (8), and three constant temperature zones are divided in barrel district (7), and preceding constant temperature zone is provided with leading portion oil-in (71), leading portion oil return opening (72); Middle constant temperature zone is provided with stage casing oil-in (73), stage casing oil return opening (74); Back constant temperature zone is provided with back segment oil-in (75), back segment oil return opening (76), and the oil line pipe of each constant temperature zone is set as spiral or back-shaped shape and twines the auxilliary barrel outside that is located at, auxilliary again dress insulation material.
4. the liquid phase of injection moulding apparatus according to claim 1 and 2 heats and constant temperature system; It is characterized in that described injection Head Section (4) is provided with No. 4 oil-ins (41); No. 4 oil return openings (42), the spiral or back-shaped shape of oil line pipe twines the auxilliary outside that is located at injection head, auxilliary again dress insulation material.
5. the liquid phase of injection moulding apparatus according to claim 1 heats and constant temperature system; It is characterized in that being provided with several minutes oil sump in the described thermal conductive silicon oil sump (1); The quantity of heater (21), Wen Xianyi, oil pump (11) sets with dividing oil sump, and the oil temperature in the thermal conductive silicon oil sump (1) is controlled by temperature control system (2).
6. heating of the liquid phase of injection moulding apparatus according to claim 5 and constant temperature system is characterized in that the gauge tap of described temperature control system (2), oil pump (11), Wen Xianyi, switch door (5) concentrates on console.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101207259A CN101474855B (en) | 2008-09-02 | 2008-09-02 | Liquid phase heating constant temperature system of injection mould device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101207259A CN101474855B (en) | 2008-09-02 | 2008-09-02 | Liquid phase heating constant temperature system of injection mould device |
Publications (2)
| Publication Number | Publication Date |
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| CN101474855A CN101474855A (en) | 2009-07-08 |
| CN101474855B true CN101474855B (en) | 2012-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008101207259A Expired - Fee Related CN101474855B (en) | 2008-09-02 | 2008-09-02 | Liquid phase heating constant temperature system of injection mould device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101797634B (en) * | 2010-03-25 | 2012-07-04 | 清华大学 | Die-casting mold multi-point precise temperature control system and method |
| CN103522510A (en) * | 2013-10-11 | 2014-01-22 | 昆山市华浦塑业有限公司 | Constant temperature heating injection molding machine |
| CN108050132A (en) * | 2017-12-07 | 2018-05-18 | 海天塑机集团有限公司 | The oil temperature keeping method and system of a kind of electric-hydraulic combined injection molding machine |
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