CN104527013A - Waste heat recovering and utilizing system and method of plastic pipe production line - Google Patents
Waste heat recovering and utilizing system and method of plastic pipe production line Download PDFInfo
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- CN104527013A CN104527013A CN201410761646.1A CN201410761646A CN104527013A CN 104527013 A CN104527013 A CN 104527013A CN 201410761646 A CN201410761646 A CN 201410761646A CN 104527013 A CN104527013 A CN 104527013A
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- 239000004033 plastic Substances 0.000 title claims abstract description 111
- 229920003023 plastic Polymers 0.000 title claims abstract description 111
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 47
- 239000002918 waste heat Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 37
- 238000001816 cooling Methods 0.000 claims abstract description 23
- 230000001105 regulatory effect Effects 0.000 claims abstract description 3
- 238000011084 recovery Methods 0.000 claims description 17
- 238000004064 recycling Methods 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000001125 extrusion Methods 0.000 abstract description 3
- 239000003000 extruded plastic Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 239000004568 cement Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/275—Recovery or reuse of energy or materials
- B29C48/276—Recovery or reuse of energy or materials of energy
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92209—Temperature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a waste heat recovering and utilizing system and method of a plastic pipe production line. The waste heat recovering and utilizing system comprises a heat recovering device arranged at an extrusion molding core mould, wherein the heat recovering device is connected with a raw material preheating bin; the heat recovering device comprises a heat recovering hole connected in from the core mould and connected with the center of an extruded plastic pipe. The waste heat recovering and utilizing method disclosed by the invention comprises the following steps: obtaining the temperature of the center of the plastic pipe of the extrusion core mould; sucking the heat by adopting a negative pressure fan; conveying the heat to the raw material preheating bin and other heat utilizing occasions; detecting the temperature in the core mould in real time, regulating a working parameter of the negative pressure fan; and detecting the temperature in the raw material preheating bin in real time so as to regulate inlet air heat. According to the waste heat recovering and utilizing system and method, high-temperature air is sucked from the interior of the plastic pipe and the sucked heat is used in production. Because the inner wall of the plastic pipe is effectively cooled, the difference of the temperatures inside and outside the plastic pipe is balanced, and no cracks are easily formed. Because the cooling speed of the plastic pipe is relatively high, the delivery speed of the pipe is high, and the yield is increased. Meanwhile, heat energy is recycled, so that the energy consumption is reduced.
Description
Technical field
Relate to the waste heat recycling system on a kind of plastic pipe production line and method.
Background technology
Plastic pipe range of application is very wide, and current topmost application is mainly supplies water and supplies combustion gas.The pipeline comprising urban pipe network is all mainly plastic cement pipeline, and national annual plastic cement pipeline output is very large.
The industrialization line flow procedure of plastic pipe is as follows.A plastic cement material is carried out preheating in raw material cabin, and its preheat temperature about 80 degree, in order to discharge the moisture content may carried secretly in plastic grains.Plastic grains after preheating puts into mould, and by its fusing of applied at elevated temperature, and extrude core continuously by screw rod, plastic pipe is shaped.Plastic pipe after shaping enters into immediately in vacuum tank and carries out cold water spray, lowers the temperature to plastic pipe surface.Reducing temperature twice is carried out through cooler bin again after cooling.Plastic pipe after repeatedly lowering the temperature cuts off at the tail end of production line, rolls off the production line.
On plastic pipe production line, a plastics material is made to have plasticity mainly through high temperature, then at high temperature just plastic by extruding.The extrusion die temperature of general plastic cement pipeline is 160 to 180 degree, and this means that the plastic pipe temperature squeezed out in core is not less than 160 degree, central temperature is at 160 degree to 180 degree.Cooling work in vacuum tank mainly cools the surface of plastic pipe, water spray cannot reach in the middle part of plastic pipe, and due to the non-constant of thermal conductivity of plastic pipe, so after surface temperature is cooled to suitable temperature, center still remains high temperature, and it is unfavorable that this produces plastic pipe.About the cooling of plastic pipe, in addition, also there are following some shortcomings in plastic pipe production line.
1, because spraying cooling can only cool for plastic pipe surface, and plastic pipe core have accumulated a large amount of heats, cause tubing center and the outside temperature difference very large, under the so high temperature difference, form the outside quick refrigeration of tubing to shrink, and internal high temperature is supported to cause in external contracting by swollen rising swollen, tube surfaces stretches, and forms crackle.And pipe material inner wall pressure is compressed by appearance, material is intensive, and the inside and outside material of final formation is uneven.
2, plastic tube body inwall is without cooling, and inner wall temperature is high, and body cooling and shaping is slow, and cause cooling effect not good, the plastic pipe failing to reach cooling effect cannot roll off the production line, and only has prolongation cool time, delays downtime, to reach required cooling effect.Cause the production line speed of response slow, in the unit interval, output efficiency is low.
3, the plastic pipe after rolling off the production line, to interior and exosmosis residual temperature, forms residual stress, and tubing easily causes distortion under residual stress, has influence on the linearity of tubing and ovality and tubing.Generally, the plastic pipe after rolling off the production line, under a large amount of amount of residual heat will, is easily out of shape.
4, core is made up of the core bar in sleeve and sleeve, the outside that sleeve completes plastic pipe is shaping, core bar completes the inner wall forming of plastic pipe, because core is inner, with high temperature, the plastics that against core bar easily separate out small molecule material, form buildup, buildup is graininess, plastic pipe is from after core bar is extruded, and granular buildup can form cut at plastic pipe inwall, have influence on the fineness of table in plastic pipe.
5, heat dissipation in a large amount of plastic pipes, forms thermal waste, affects environment simultaneously.
Summary of the invention
In order to solve the problem, the invention provides a kind of plastic pipe production line waste heat recycling system and method, core and the plastic pipe extruded central temperature can be reclaimed, and successfully the temperature of recovery being used plastic pipe workshop.
Plastic pipe production line waste heat recycling system provided by the present invention comprises extruding machine core 4, vacuum cooling tank 6, raw material preheating storehouse 1; It is characterized in that, described core is provided with heat reclaim unit, for reclaiming the high temperature extruding plastic pipe 5 heart portion in extruding machine core.
Heat reclaim unit is connected with raw material preheating storehouse 1; For heat is supplied to raw material preheating storehouse, preheating is carried out to raw material in raw material preheating storehouse.
Described heat reclaim unit comprises heat recovery hole 8, and heat recovery hole penetrates from core 4 sidewall, passes to center, core front end, is connected with the plastic pipe center of extruding.
Be provided with negative-pressure air fan 3 between described heat reclaim unit and raw material preheating storehouse, core is provided with temperature-detecting device 7, temperature-detecting device is connected with negative-pressure air fan by temperature controller.
A kind of plastic pipe production line waste heat recycling system as above, further illustrate into, described negative-pressure air fan is transducer drive blower fan, and frequency converter is connected with temperature controller, controls frequency converter by temperature controller.
A kind of plastic pipe production line waste heat recycling system as above, further illustrate for, described negative-pressure air fan is connected with recovery house steward, reclaims on house steward and is provided with arm connection raw material preheating storehouse, reclaim on house steward and be also provided with arm for outside quantity of heat given up.
Be provided with the second temperature-detecting device in raw material preheating storehouse, arm be provided with the second blower fan 2, second temperature-detecting device and be connected with the second blower fan.
Plastic pipe production line waste heat recycle method of the present invention, its working method is as follows:
1, plastic pipe 5 central temperature extruding core is obtained by temperature-detecting device 7.
2, transducer drive negative-pressure air fan 3, begins through heat recovery hole 8 and extract heat in plastic pipe.
3, by the heat be drawn into by reclaiming house steward and arm is transported to raw material preheating storehouse 1 and other uses thermal field institute.
4, the real temperature detected in core during temperature-detecting device, to regulate the running parameter of negative-pressure air fan 3 by frequency converter.
5, the second temperature-detecting device detects the temperature in raw material preheating storehouse in real time, to regulate the second blower fan 2 running parameter.
A kind of plastic pipe production line waste heat recycle method as above, further illustrate into, according to the temperature range that best chilling temperature value setting plastic cement center, plastic pipe center controls; Open negative-pressure air fan, discharge heat from plastic pipe center; Constant in temperature range by controlling negative-pressure air fan exhaust air rate control plastic pipe central temperature.
A kind of plastic pipe production line waste heat recycle method as above, further illustrate into, described best chilling temperature value is determined by the quality and production efficiency having influence on plastic tube.
A kind of plastic pipe production line waste heat recycle method as above, further illustrate into, the hot blast temperature be transported in raw material preheating storehouse is 75 ~ 85 DEG C.
the beneficial effect of the technology of the present invention:
The present invention arranges heat recovery hole in core, by extracting high-temperature gas out from plastic pipe inside, the plastic pipe inside of just extruding core being cooled, and the heat of extraction is carried out Commercial cultivation.
1, because carrying out effective temperature-reducing to plastic pipe inwall, balancing plastic pipe internal-external temperature difference, using inside and outside plastic pipe homogeneous, not easily forming crackle.
2, cool inside and outside plastic tube body, make body cooling and shaping fast, under tubing, linear velocity is fast, improves the output of wall scroll pipe production line simultaneously.By result of the test measuring and calculating, every bar production line production capacity every day improves 30% ~ 34% because of under same power consumption state, can increase production capacity 30%, so convert, be equivalent to increase part and can save energy consumption (electricity consumption) 300,000.
3, the plastic pipe after rolling off the production line is to inside and outside without residual stress, and tubing can not be out of shape, and improves the ovality of tubing and the linearity of tubing.
4, the timely heat extraction of the core bar of core, avoids core bar buildup, improves the fineness of table in plastic pipe.
5, the present invention is by having discharged production line waste heat gives effective utilization originally, reach energy-saving effect, eliminate the electrical heating energy consumption in raw material preheating storehouse, calculate by existing electrical heating preheating method, can power saving 30% in the production line unit interval, calculate by 60 yuan of power consumptions per ton, meter annual output 20000 tons of plastic pipes, year power cost saving about 1,200,000 yuan.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
The present invention implements in the following manner:
Offer heat recovery hole, heat recovery hole to offer mode various, plan by the concrete structure of core, as long as can from the sidewall of core open into, output from the front end of core bar, just can be connected with heat recovery hole by plastic pipe, size, the length in hole can not limit, yes when not affecting core extruding, heat recovery hole open comparatively large as well.The present embodiment is opened into heat recovery hole from the sidewall of core, downwards through inner collar, and vertical duction again on cover ring wall, forward end is deep, is transitioned into core bar center, passes from core bar center, is communicated with the plastic pipe center of just having extruded.
The a large amount of heat of the plastic pipe inner band just extruded, about 170 degree, but, in the continuous process extruded from core, in plastic pipe side-wall hole discharges heat, can not can only change hole route from core, the structure of core is also uncomplicated, there is multiple heat recovery holes track route can select, so do not limit at this.
In heat recovering process, after plastic pipe is extruded in core, experience vacuum water spraying cooling box respectively, then to spray cooling case below, repeatedly lower the temperature for one section one section, temperature-fall period plastic cement pipeline is by walking about 50 meters.After covering cooling line, carry out cutting section, roll off the production line.The gas sucked in heat recovery hole, it is the normal temperature air sucked from plastic pipe cut place, always along plastic pipe center, arrive core part, again from core sucking-off, just transform in order to high-temperature gas, be with the high temperature played in plastic bottle pipe, effective cooling is carried out to the center of plastic pipe, accelerates plastic pipe overall cool time.
Raw material preheating storehouse of the present invention was electrical heating type pre-heating cabin originally, heats, and arrange thermal-insulation coat by pre-heating cabin body case is wound around electrical heating wire.Its heating effect from the progressive heating in export-oriented plastic material center, poor effect.Raw material preheating storehouse of the present invention is owing to adopting gas-heated, and gas directly can be accessed bottom raw material preheating storehouse, heat gas passes through from raw material hole, and discharge at the bottom of top, raw material preheating storehouse, its process is that whole raw material is heated simultaneously, and homogeneous heating is effective.When the second detected temperatures detects that the gas temperature passed into is too high, control the air quantity of the second blower fan, close entering of few heat gas, to reduce the temperature in raw material preheating storehouse, to be heated caking to avoid the raw material in raw material preheating storehouse.Pass into gas temperature in raw material preheating storehouse for being not more than 80 degree.Temperature is too high, can fill into outside normal temperature air, to reduce temperature by the second blower fan.So, at the air inlet of the second blower fan, can conversion valve be set, in the high temperature air sucked in extraneous normal temperature air and heat recovering process, carries out adjustment conversion, to keep not overtemperature.
The real temperature detected in core during temperature-detecting device, to be regulated the running parameter of negative-pressure air fan 3 by frequency converter, according to the temperature range that best chilling temperature value setting plastic cement center, plastic pipe center controls; Open negative-pressure air fan, discharge heat from plastic pipe center; Constant in temperature range by controlling negative-pressure air fan exhaust air rate control plastic pipe central temperature.The type of cooling due to plastic pipe center is air-cooled (by siphoning away heat), and outside is shower water cooling, certainly, shower water is than the air-cooled cooling effect of having more, so the temperature of plastic pipe inside all the time can be higher than plastic pipe surface, so the inhomogeneous cooling weighing apparatus situation that the too low meeting of plastic cement central temperature causes can not be considered, but in concrete implementation process, still will control plastic pipe central temperature can not be too low, because the too low meeting of temperature causes the plastic pipe internal pressure just extruded to reduce, too low internal pressure may cause body to be out of shape, so, the running parameter of negative-pressure air fan must be controlled, cannot exhausting amount too large, keep the temperature of extracting out and the temperature equalization just having extruded core just can (as: 168 ~ 175 DEG C), if the temperature of extracting out is too low, show that exhausting amount is excessive, the exhausting amount of blower fan must be reduced.
The reduction of the present invention to the raising and energy consumption that improve plastic pipe production line output has the effect of highly significant.Below by some statistics drawn in the trial production stage in factory with explanation.
The energy consumption service condition of the technology of the present invention:
Economic benefit of the present invention is considerable, calculates by improvement of manufacturing line expense, the improvement expenses of an average production line less than 300,000 yuan, the average electricity charge of saving for three months and recoverable cost.
The Qualified Products Rate situation of the technology of the present invention:
Due to inside and outside interior time cool, use eliminate product roll off the production line after thermal stress, after product rolls off the production line, unlikely distortion, does not crack, and improves product quality and qualification rate.
Core inside is cooled, and core does not produce high temperature ramming material particle, improves product inwall fineness.
The increase of above-mentioned qualification rate, also corresponding reduction product rejection rate, directly improve product yield and reduce costs.
The output condition of the technology of the present invention:
| Average every bar production line one hour per unit area yield | Annual output | Volume increase | |
| Only appearance spraying cooling | 500kg | 3600 tons | / |
| Inside and outside cool simultaneously | 650kg | 4680 tons | 1080 tons |
Because cooling velocity is faster, the effect of increasing production of product is obvious, and increase is all carry out increasing production on the basis not increasing extra cost, does not increase cost of labor, does not increase consuming time, do not increase energy cost.
Claims (8)
1. a plastic pipe production line waste heat recycling system, comprises extruding machine core (4), vacuum cooling tank (6), raw material preheating storehouse (1); It is characterized in that, described core is provided with heat reclaim unit, for reclaiming the high temperature extruding plastic pipe (5) heart portion in extruding machine core;
Heat reclaim unit is connected with raw material preheating storehouse (1); For heat is supplied to raw material preheating storehouse, preheating is carried out to raw material in raw material preheating storehouse;
Described heat reclaim unit comprises heat recovery hole (8), and heat recovery hole penetrates from core (4) sidewall, passes to center, core front end, is connected with the plastic pipe center of extruding;
Be provided with negative-pressure air fan (3) between described heat reclaim unit and raw material preheating storehouse, core is provided with temperature-detecting device (7), temperature-detecting device is connected with negative-pressure air fan by temperature controller.
2. a kind of plastic pipe production line waste heat recycling system as claimed in claim 1, it is characterized in that, described negative-pressure air fan is transducer drive blower fan, and frequency converter is connected with temperature controller, controls frequency converter by temperature controller.
3. a kind of plastic pipe production line waste heat recycling system as claimed in claim 1, it is characterized in that, described negative-pressure air fan is connected with recovery house steward, reclaims on house steward and is provided with arm connection raw material preheating storehouse, reclaim on house steward and be also provided with arm for outside quantity of heat given up.
4. be provided with the second temperature-detecting device in the raw material preheating storehouse described in, arm is provided with the second blower fan (2), the second temperature-detecting device is connected with the second blower fan.
5. a plastic pipe production line waste heat recycle method, is characterized in that,
(1) plastic pipe (5) central temperature extruding core, is obtained by temperature-detecting device (7);
(2), transducer drive negative-pressure air fan (3), begin through heat recovery hole (8) and extract heat in plastic pipe;
(3), by the heat be drawn into by reclaiming house steward and arm is transported to raw material preheating storehouse (1) and other uses thermal field institute;
(4), temperature-detecting device time the real temperature detected in core, to be regulated the running parameter of negative-pressure air fan (3) by frequency converter;
(5), the second temperature-detecting device detects temperature in raw material preheating storehouse, in real time to regulate the second blower fan (2) running parameter.
6. a kind of plastic pipe production line waste heat recycle method as claimed in claim 6, is characterized in that, according to the temperature range that best chilling temperature value setting plastic cement center, plastic pipe center controls; Open negative-pressure air fan, discharge heat from plastic pipe center; Constant in temperature range by controlling negative-pressure air fan exhaust air rate control plastic pipe central temperature.
7. a kind of plastic pipe production line waste heat recycle method as claimed in claim 7, is characterized in that, described best chilling temperature value is determined by the quality and production efficiency having influence on plastic tube.
8. a kind of plastic pipe production line waste heat recycle method as claimed in claim 6, is characterized in that, the hot blast temperature be transported in raw material preheating storehouse is 75 ~ 85 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410761646.1A CN104527013A (en) | 2014-12-13 | 2014-12-13 | Waste heat recovering and utilizing system and method of plastic pipe production line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410761646.1A CN104527013A (en) | 2014-12-13 | 2014-12-13 | Waste heat recovering and utilizing system and method of plastic pipe production line |
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| CN104527013A true CN104527013A (en) | 2015-04-22 |
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| CN201410761646.1A Pending CN104527013A (en) | 2014-12-13 | 2014-12-13 | Waste heat recovering and utilizing system and method of plastic pipe production line |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108790107A (en) * | 2018-08-08 | 2018-11-13 | 新疆登煌管业有限公司 | A kind of heavy caliber PE pipes cooling and shaping device and method |
| CN108859055A (en) * | 2018-05-29 | 2018-11-23 | 联塑科技发展(贵阳)有限公司 | A kind of PPR pipe mold heat-energy recovering apparatus |
| CN106335169B (en) * | 2016-08-23 | 2019-03-26 | 浙江双林机械股份有限公司 | Plastic tube extrusion equipment heat exchange circulation system and its application method |
| CN109624261A (en) * | 2019-02-21 | 2019-04-16 | 上海金纬管道设备制造有限公司 | Heat-energy recovering apparatus, extrusion equipment and the heat energy recovering method of extrusion equipment |
| CN111300706A (en) * | 2019-12-28 | 2020-06-19 | 贵州金田新材料科技有限公司 | Waste heat recovery utilizes system in BOPP membrane manufacturing process |
| CN115773651A (en) * | 2022-12-02 | 2023-03-10 | 江苏亨通电力电缆有限公司 | A negative pressure and circulation drying composite device and a rodent-proof cable manufacturing process |
| CN119458829A (en) * | 2024-12-17 | 2025-02-18 | 临沂利方塑胶制品有限公司 | Injection molding machine for processing plastic products |
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