CN105291396A - Gas treatment device for producing optical fiber protection empty pipe and die assembly - Google Patents
Gas treatment device for producing optical fiber protection empty pipe and die assembly Download PDFInfo
- Publication number
- CN105291396A CN105291396A CN201510652606.8A CN201510652606A CN105291396A CN 105291396 A CN105291396 A CN 105291396A CN 201510652606 A CN201510652606 A CN 201510652606A CN 105291396 A CN105291396 A CN 105291396A
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- gas
- pipe
- core rod
- fiber optic
- gas outlet
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
-
- 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
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- 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
- B29C48/30—Extrusion nozzles or dies
-
- 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
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
Abstract
The invention relates to a gas treatment device for producing an optical fiber protection empty pipe, and belongs to the field of optical cables. The device comprises a pressure regulating valve, a first gas storing tank, a second gas storing tank, a first precision filter, a second precision filter, a precision pressure regulating valve and a precision flowmeter, wherein a gas inlet of the pressure regulating valve is connected with a gas feeding pipe while a gas outlet of the pressure regulating valve is connected with the gas inlet of the first gas storing tank; the gas outlet of the first gas storing tank is connected with the gas inlet of the second gas storing tank; the gas outlet of the second gas storing tank is connected with a gas feeding end of the first precision filter; a gas discharging end of the first precision filter is connected with the gas feeding end of the second precision filter; the gas discharging end of the second precision filter is connected with the gas feeding end of the precision pressure regulating valve; the gas discharging end of the precision pressure regulating valve is connected with the gas inlet of the precision flowmeter, and the gas outlet of the precision flowmeter is connected with a gas discharging pipe. The invention further discloses a die assembly. The gas treatment device for producing the optical fiber protection empty pipe has the main beneficial effects that the equipment is simple, the production is easy, the use is easy, the cost is low, and the produced finished product of the optical fiber protection empty pipe is high in percent of pass, stable and reliable in quality, and low in cost.
Description
The application is the applying date is that 2014 04 month 03 day, is called: manufacture method, the application number of fiber optic protection blank pipe are: the divisional application of the patent of invention of 201410132890.1.
Technical field
The invention belongs to technical field of electric wires and cables, especially relate to the manufacture method of fiber optic protection blank pipe.
Background technology
Along with the fast development of the communications industry, the demand of optical fiber is increasing, and the Main Ingredients and Appearance due to optical fiber is highly purified silica, and silica is the main component of soil, and therefore, optical fiber is relative to metal material, and resource is abundanter.On the other hand, in optical fiber not containing metal element, lightweight, loss is little, long transmission distance, without electromagnetic interference etc., therefore, in field of signal transmissions, " light entering and copper back " becomes the trend of development, especially in indoor signal transmission, between machinery equipment in high speed transmission of signals, the use of optical fiber is more and more frequent.When indoor use; normally adopt inside cable to connect, but existing cable length does not often meet the requirement of use sometimes; therefore; user can adopt bare fibre or colored optical fiber to add the mode of wearing fiber optic protection blank pipe usually, realize need connection, due to bare fibre or colored optical fiber more fragile; very easily rupture when not adding protection; therefore for protection optical fiber, connection in this case, fiber optic protection blank pipe is of crucial importance.The diameter of bare fibre or colored optical fiber is generally no more than 260 μm; the diameter of the fiber optic protection blank pipe that the joints of optical fibre allow is generally Φ 900 ± 50 μm; therefore; the internal diameter of fiber optic protection blank pipe is generally between Φ 400 ± 50 μm; for internal diameter thin like this, need more accurate equipment or more advanced technique and mould during manufacture, however; the qualification rate of the manufacture of domestic and international fiber optic protection blank pipe is lower, therefore makes the price of fiber optic protection blank pipe be in a high position.
Summary of the invention
For solving the problem, the present invention discloses a kind of manufacture method of fiber optic protection blank pipe, and the finished product that it greatly can improve fiber optic protection blank pipe makes qualification rate, and reduce the cost of fiber optic protection blank pipe, it realizes by the following technical solutions.
The manufacture method of fiber optic protection blank pipe, is characterized in that it comprises following steps:
The first step, melts fiber optic protection blank pipe material, nylon or Kynoar is put into extruding machine and melts;
Second step, install and adjustments of gas treating apparatus: described gas treatment equipment it comprise pressure regulator valve, the first air accumulator, the second air accumulator, the first accurate filter, the second accurate filter, precise pressure regulating valve, delicate flow meter, the air inlet of pressure regulator valve is connected with air inlet pipe, the gas outlet of pressure regulator valve connects the air inlet of the first air accumulator by pipeline, the gas outlet of the first air accumulator connects the air inlet of the second air accumulator by pipeline, the gas outlet of the second air accumulator connects the inlet end of the first accurate filter by pipeline, the outlet side of the first accurate filter connects the inlet end of the second accurate filter by pipeline, the outlet side of the second accurate filter connects the inlet end of precise pressure regulating valve by pipeline, the outlet side of precise pressure regulating valve connects the air inlet of delicate flow meter by pipeline, the gas outlet of delicate flow meter is connected with escape pipe, be that 0.7-0.76MPa Compressed Gas sends into pressure regulator valve 1 by air inlet pipe 11 by pressure, the outlet pressure of pressure regulator valve 1 is adjusted to 0.5-0.6MPa, the pressure making the second air accumulator gas outlet place is 0.5-0.6MPa, the pressure of the second accurate filter outlet side is made to be 0.3-0.4MPa, the gas output of the gas outlet 13 of adjustment precision flowmeter is at 12-14L,
3rd step, installation mold assembly: core rod and die sleeve are arranged on extrusion head, core rod 9 inside and the inside of holding path portion 93 be all hollow, the path portion 93 that holds of core rod is arranged in the die sleeve chamber 89 of die sleeve 8, that holds path portion has a perforate 94 foremost, and the rear end face of core rod 9 has a through hole, is provided with and leads fine pipe 92 in this through hole, the both ends of leading fine pipe are hollow, the inside of leading fine pipe be hollow lead fine chamber 921; The inwall of leading fine pipe and core rod is discontiguous and leads the front end of fine pipe and holding between path portion of core rod has gap; The escape pipe 13 of the gas outlet of delicate flow meter is connected to the inlet end 95 of core rod unit 9;
4th step, opens the extruding part of extruding machine: the blank pipe material of melting enters die sleeve chamber 89 from extrusion head, flows to the front end in die sleeve chamber, and forms fiber optic protection blank pipe 10 from holding the die sleeve chamber 89 that formed between path portion 93 and die sleeve front end to extrude; Compressed Gas from escape pipe 13 enters inlet end 95, and enters and hold path portion 93 and blow out from perforate 94, from the compressed air that the wall body holding path portion is reflected back, enters and leads leading in fine chamber 921 and being discharged to core rod outside of fine pin 92;
5th step, traction, cooling, coiled fiber protection blank pipe.
The manufacture method of fiber optic protection blank pipe described above, is characterized in that between the second accurate filter and precise pressure regulating valve, be provided with the 3rd air accumulator.
The manufacture method of fiber optic protection blank pipe described above, is characterized in that the delicate flow meter described in second step is digital display type.
The present invention has following main beneficial effect: manufacture method simply, is easily grasped, and the fiber optic protection blank pipe product qualified rate of production is high, steady quality is reliable, cost is low.
Accompanying drawing explanation
Fig. 1 is the perspective view of the gas treatment equipment used in the inventive method.
Fig. 2 is the schematic diagram of the Making mold fiber optic protection blank pipe used in the inventive method.
Fig. 3 is the cross-sectional structure schematic diagram of the fiber optic protection blank pipe that the inventive method manufactures.
Detailed description of the invention
embodiment
For making the personnel of art can understand the application more accurately, now elaborate by reference to the accompanying drawings.
Ask for an interview Fig. 1 to Fig. 3, the manufacture method of fiber optic protection blank pipe, it is characterized in that it comprises following steps:
The first step, melts fiber optic protection blank pipe material, nylon or Kynoar is put into extruding machine and melts;
Second step, install and adjustments of gas treating apparatus: described gas treatment equipment it comprise pressure regulator valve 1, first air accumulator 2, second air accumulator 3, first accurate filter 4, second accurate filter 5, precise pressure regulating valve 6, delicate flow meter 7, the air inlet of pressure regulator valve 1 is connected with air inlet pipe 11, the gas outlet of pressure regulator valve 1 connects the air inlet of the first air accumulator by pipeline, the gas outlet of the first air accumulator connects the air inlet of the second air accumulator by pipeline, the gas outlet of the second air accumulator connects the inlet end of the first accurate filter by pipeline 12, the outlet side of the first accurate filter connects the inlet end of the second accurate filter by pipeline, the outlet side of the second accurate filter connects the inlet end of precise pressure regulating valve 6 by pipeline, the outlet side of precise pressure regulating valve 6 connects the air inlet of delicate flow meter by pipeline, the gas outlet of delicate flow meter 7 is connected with escape pipe 13, be that 0.7-0.76MPa Compressed Gas sends into pressure regulator valve 1 by air inlet pipe 11 by pressure, the outlet pressure of pressure regulator valve 1 is adjusted to 0.5-0.6MPa, the pressure making the second air accumulator gas outlet place is 0.5-0.6MPa, the pressure of the second accurate filter outlet side is made to be 0.3-0.4MPa, the pressure of the gas outlet 13 of adjustment precision flowmeter is 0.01MPa, and flow is 0-25L/min, and the gas output of the gas outlet 13 of delicate flow meter is at 12-14L, ,
3rd step, installation mold assembly: core rod and die sleeve are arranged on extrusion head, core rod 9 inside and the inside of holding path portion 93 be all hollow, the path portion 93 that holds of core rod is arranged in the die sleeve chamber 89 of die sleeve 8, that holds path portion has a perforate 94 foremost, and the rear end face of core rod 9 has a through hole, is provided with and leads fine pipe 92 in this through hole, the both ends of leading fine pipe are hollow, the inside of leading fine pipe be hollow lead fine chamber 921; The inwall of leading fine pipe and core rod is discontiguous and leads the front end of fine pipe and holding between path portion of core rod has gap; The escape pipe 13 of the gas outlet of delicate flow meter is connected to the inlet end 95 of core rod unit 9;
4th step, opens the extruding part of extruding machine: the blank pipe material of melting enters die sleeve chamber 89 from extrusion head, flows to the front end in die sleeve chamber, and forms fiber optic protection blank pipe 10 from holding the die sleeve chamber 89 that formed between path portion 93 and die sleeve front end to extrude; Compressed Gas from escape pipe 13 enters inlet end 95, and enters and hold path portion 93 and blow out from perforate 94, from the compressed air that the wall body holding path portion is reflected back, enters and leads leading in fine chamber 921 and being discharged to core rod outside of fine pin 92;
5th step, traction, cooling, coiled fiber protection blank pipe.
The manufacture method of fiber optic protection blank pipe described above, is characterized in that the delicate flow meter described in second step is digital display type.
Certainly, as further improvement, 3rd air accumulator of one suitable storage amount can be installed between the second accurate filter 5 and precise pressure regulating valve 6 again, in this case, when continuous seepage, first accurate filter 4 and the second accurate filter 5 can individually be replaced online, and do not affect continuous seepage.
Manufacturing theory of the present invention is such: pressure is that 0.7-0.76MPa compressed air or compressed nitrogen (hereinafter summary is Compressed Gas) send into pressure regulator valve 1 by air inlet pipe 11, pressure regulator valve 1 has pressure adjustment knob, outlet pressure is adjusted to 0.5-0.6MPa, owing to having the impurity such as oil, moisture content in Compressed Gas, therefore, if itself and fiber optic protection blank pipe contact internal walls, fiber optic protection blank pipe can be blocked, also can protect fiber optic protection blank pipe in forming process, occur the phenomenon such as pore, bubble, for this reason, oil and moisture content must be removed; After compressed air first and second air accumulator by mutual serial connection, because air accumulator can not only stores compression gas, reduce the pressure fluctuation due to the discontinuous generation of compressor air-discharging, reduce the frequent starting of compressor, extend the life-span of compressor, realize air feed and the balance with gas, and the temperature of Compressed Gas can be reduced, reduce the load of filter for molten and drier; Adopt two air accumulators not only can function as described above, the volume of whole device can also be made greatly to reduce, be convenient to transport and preserve and installation and debugging; Therefore two-stage air accumulator greatly stabilizes the pressure of Compressed Gas, and the pressure at the second air accumulator gas outlet place is 0.5-0.6MPa; Compressed Gas is after voltage stabilizing, enter first and second accurate filter, oil in Compressed Gas and moisture content are removed, obtain purer Compressed Gas, pure Compressed Gas enters precise pressure regulating valve, pass through fine adjustment, the pressure of its outlet side is made to be 0.3-0.4MPa, then delicate flow meter is entered, according to size and the speed of production of produced fiber optic protection blank pipe, the flow of suitable adjustment Compressed Gas, make the pressure of the gas outlet of delicate flow meter be 0.01MPa, the gas output of the gas outlet 13 of adjustment precision flowmeter is at 12-14L; Range of flow regulates between 0-25L/min according to technological requirement.
Be connected to the inlet end 95 of core rod unit 9 in escape pipe 13 connection layout 2 of the gas outlet of delicate flow meter, the mode of squeezing pipe is adopted to produce fiber optic protection blank pipe, core rod unit 9 inside and the inside of holding path portion 93 be all hollow, the path portion 93 that holds of core rod is arranged in the die sleeve chamber 89 of die sleeve 8, that holds path portion has a perforate 94 foremost, the rear end face of core rod unit 9 has a through hole, be provided with in this through hole and lead fine pipe 92, the both ends of leading fine pipe are hollow, the inside of leading fine pipe be hollow lead fine chamber 921, the inwall of leading fine pipe and core rod is discontiguous and leads the front end of fine pipe and holding between path portion of core rod has gap, when producing fiber optic protection blank pipe, the blank pipe material of melting enters die sleeve chamber 89 from extrusion head along the large direction of arrow, relation due to pressure flows to the front end in die sleeve chamber, and form fiber optic protection blank pipe 10 from holding the die sleeve chamber 89 that formed between path portion 93 and die sleeve front end to extrude, pure from escape pipe 13, after the Compressed Gas of pressure and stability of flow enters inlet end 95, due to the relation of pressure, compressed air enters and holds path portion 93 and blow out from perforate 94, the compressed air of blowout makes fiber optic protection blank pipe rounding more, tube wall can not be bondd mutually when cooling, make the cooling of pipeline quicker, when not adopting the method, when fiber optic protection blank pipe cools in the sink, outside heat gathers rapidly toward interior, after adopting this method, internal heat is taken away fast, therefore faster crystalline forming.Certainly, compressed air is reflected back from the wall body holding path portion on the other hand, enter and lead leading in fine chamber 921 and being discharged to core rod outside of fine pin 92, inside due to core rod has higher temperature, the gas be reflected back has taken away heat, make the temperature in core rod more stable, produce fiber optic protection blank pipe external diameter evenly, wear fine more excellent performance, the geometric identity of blank pipe is better, through production repeatedly and the test of applicant, after adopting device of the present invention and mould and method to produce, the product qualified rate manufacturing fiber optic protection blank pipe has increased substantially 99.3%-99.8% by common 25%-35%, therefore, greatly increase efficiency, make that product quality is more stable, reliable, cost is lower.
In Fig. 3, fiber optic protection blank pipe 10 is made up of the hole 102 of pipe wall body 101 and hollow.
Prototype part in the gas treatment equipment used in the present invention commercially can be purchased; Gas treatment equipment, by simple measure, mainly serves and makes the effect that the purity of Compressed Gas is higher, pressure is more stable.
Central inventive feature of the present invention has two: one for gas treatment equipment; Two is the structure of core rod unit, and core rod unit has inlet end 95, the rear end face of core rod unit 9 has a through hole, is provided with and leads fine pipe 92 in this through hole, and the both ends of leading fine pipe are hollow, the inside of leading fine pipe be hollow lead fine chamber 921; The inwall of leading fine pipe and core rod is discontiguous and leads the front end of fine pipe and holding between path portion of core rod has gap; Said structure makes the hole that the Compressed Gas stable, purity is high can be adopted in the present invention to carry out the hollow compressing fiber optic protection blank pipe make it not block and cooling tube wall body, and in prior art, due to produce optical cable or the outside diameter of cable thicker, adopt the mode vacuumized sometimes on the contrary, namely adopt the mode vacuumized in the rear end of core rod unit, make plastics be close on cable core; Leading fine pin hole discharge hot gas in the present invention makes the production of fiber optic protection blank pipe more stable.
Certainly, the existence leading fine pin hole in the present invention can also be used to penetrate optical fiber, manufactures tightly packaged fiber, now, does not need to pass into compressed air in core rod.
Adopt the fiber optic protection blank pipe that this method is produced, continuous seepage 2000 kilometers, every 2 kilometers is general, and often coil two ends inspection, its external diameter is stabilized in Φ 880 ± 10 μm, and internal diameter is stabilized in Φ 390 ± 10 μm; And none blocking on continuous length, there is no the appearance of bulge and depression, therefore, reach ideal technique effect; Use through user, user is satisfaction very.
The present invention has following main beneficial effect: manufacture method simply, is easily grasped, and the fiber optic protection blank pipe product qualified rate of production is high, steady quality is reliable, cost is low.
The present invention can be applied in other conceivable occasion, also belongs to the protection domain of the application in the application of other occasion.
The present invention is not limited to above-mentioned preferred forms, and should be appreciated that design of the present invention can be implemented to use by other various forms, they drop in protection scope of the present invention equally.
Claims (4)
1., for the production of the gas treatment equipment of fiber optic protection blank pipe, it is characterized in that it comprises pressure regulator valve, the first air accumulator, the second air accumulator, the first accurate filter, the second accurate filter, precise pressure regulating valve, delicate flow meter, the air inlet of pressure regulator valve is connected with air inlet pipe, the gas outlet of pressure regulator valve connects the air inlet of the first air accumulator by pipeline, the gas outlet of the first air accumulator connects the air inlet of the second air accumulator by pipeline, the gas outlet of the second air accumulator connects the inlet end of the first accurate filter by pipeline, the outlet side of the first accurate filter connects the inlet end of the second accurate filter by pipeline, the outlet side of the second accurate filter connects the inlet end of precise pressure regulating valve by pipeline, the outlet side of precise pressure regulating valve connects the air inlet of delicate flow meter by pipeline, the gas outlet of delicate flow meter is connected with escape pipe, during duty, pressure is that 0.7-0.76MPa Compressed Gas sends into pressure regulator valve by air inlet pipe, and the outlet pressure of pressure regulator valve is adjusted to 0.5-0.6MPa, the pressure of the second air accumulator gas outlet place is 0.5-0.6MPa, the pressure of the second accurate filter outlet side is 0.3-0.4MPa, the gas output of the gas outlet of adjustment precision flowmeter is at 12-14L.
2. the gas treatment equipment for the production of fiber optic protection blank pipe according to claim 1, is characterized in that being provided with the 3rd air accumulator between described second accurate filter and precise pressure regulating valve.
3. the gas treatment equipment for the production of fiber optic protection blank pipe according to claim 2, is characterized in that described delicate flow meter is digital display type.
4. for the production of the die assembly of fiber optic protection blank pipe, it is characterized in that it includes and be arranged on core rod on extrusion head and die sleeve, core rod inside and the inside of holding path portion be all hollow, the path portion that holds of core rod is arranged in the die sleeve chamber of die sleeve, that holds path portion has a perforate foremost, and the rear end face of core rod has a through hole, is provided with and leads fine pipe in this through hole, the both ends of leading fine pipe are hollow, the inside of leading fine pipe be hollow lead fine chamber; The inwall of leading fine pipe and core rod is discontiguous and leads the front end of fine pipe and holding between path portion of core rod has gap; The inlet end of core rod unit can connect for the escape pipe of the gas outlet of delicate flow meter; During extrusion molding fiber optic protection blank pipe, the blank pipe material of melting enters die sleeve chamber from extrusion head, flows to the front end in die sleeve chamber, and forms fiber optic protection blank pipe from holding the die sleeve chamber that formed between path portion and die sleeve front end to extrude; Compressed Gas from escape pipe enters inlet end, and enters and hold path portion and blow out from perforate, from the compressed air that the wall body holding path portion is reflected back, enters and leads leading in fine chamber and being discharged to core rod outside of fine pin; Described gas outlet is the gas outlet of claim 1 or claim 2 or the delicate flow meter described in claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510652606.8A CN105291396B (en) | 2014-04-03 | 2014-04-03 | Gas treatment equipment and die assembly for producing fiber optic protection blank pipe |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510652606.8A CN105291396B (en) | 2014-04-03 | 2014-04-03 | Gas treatment equipment and die assembly for producing fiber optic protection blank pipe |
| CN201410132890.1A CN103963257B (en) | 2014-04-03 | 2014-04-03 | Method for manufacturing optical fiber protection hollow tube |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201410132890.1A Division CN103963257B (en) | 2014-04-03 | 2014-04-03 | Method for manufacturing optical fiber protection hollow tube |
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| CN105291396A true CN105291396A (en) | 2016-02-03 |
| CN105291396B CN105291396B (en) | 2017-08-11 |
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| CN201510652606.8A Active CN105291396B (en) | 2014-04-03 | 2014-04-03 | Gas treatment equipment and die assembly for producing fiber optic protection blank pipe |
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| CN105954848A (en) * | 2016-07-10 | 2016-09-21 | 南京华信藤仓光通信有限公司 | Pre-stalled directly buried pipeline optical cable and production method thereof |
| CN108274721A (en) * | 2018-03-30 | 2018-07-13 | 漳州杰安塑料有限公司 | A kind of three hole stirring rod molding dies |
| CN108501346A (en) * | 2018-05-22 | 2018-09-07 | 湖南高速铁路职业技术学院 | The special air pressure regulator of sealing strip extrusion molding |
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| US20050092183A1 (en) * | 2003-11-03 | 2005-05-05 | Koslow Evan E. | Pressure limiting and/or flow regulating valve for use with POU/POE filter system |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103963257A (en) | 2014-08-06 |
| CN103963257B (en) | 2015-12-30 |
| CN105291396B (en) | 2017-08-11 |
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