CN201317097Y - Screw bolt for squeezing halogen-free, low-smoke, fire retardant cable plastic - Google Patents
Screw bolt for squeezing halogen-free, low-smoke, fire retardant cable plastic Download PDFInfo
- Publication number
- CN201317097Y CN201317097Y CNU2008202310869U CN200820231086U CN201317097Y CN 201317097 Y CN201317097 Y CN 201317097Y CN U2008202310869 U CNU2008202310869 U CN U2008202310869U CN 200820231086 U CN200820231086 U CN 200820231086U CN 201317097 Y CN201317097 Y CN 201317097Y
- Authority
- CN
- China
- Prior art keywords
- screw rod
- section
- screw bolt
- length
- compression
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The utility model relates to a screw bolt for squeezing halogen-free, low-smoke, fire retardant cable plastic, which is characterized in that the length-diameter ratio (L :D) of the screw bolt is 20-25:1, the length (L1) of a charging section is 35-45% of the total length (L) of the working part of the screw bolt, the length (L2) of a compression section is 30-40% of the total length (L) of the working part of the screw bolt, the depth (h3) of a screwed groove of aequalizing section (L3) of the screw bolt is 0.08-0.12 of the external diameter (D) of the screw bolt, the compression ratio epsilon of the compression section is 1.2-1.4, the head of the screw bolt is in a bias-cutting truncated cone structure, the cone-apex angle alpha is 60-120 degrees, the included angle theta of the bias-cutting section and the cross section of the screw bolt is 10-12 degrees, an axial deep hole for charging cooling water is processed on the center of the screw bolt, the axial deep hole extends inward from the rear end, and is stopped at the joint between the compression section and the equalizing section.
Description
Technical field
The utility model relates to a kind of common plastics extruder screw rod structure that is used for, and relates to a kind of plastic extruder that is used for specifically and extrudes the insulation of halide-free low-smoke fireproof cable and the screw rod of sheath.
Background technology
Compare with traditional flame-retardant polyvinyl chloride cable, the smog that halide-free low-smoke fireproof cable discharges when burning is less, the gas toxicity that discharges is little, acid little, is mainly used in the narrow and small place of dense population areas and space and some key areas such as skyscraper, market, subway, tunnel.Simultaneously, halide-free low-smoke fireproof cable meets the RoHS of European Union command request, is a kind of Green Product, therefore progressively is subjected to people's favor in recent years, and the market share is progressively soaring.
Because environmental protection requirement, the insulation and the sheath of halide-free low-smoke fireproof cable are generally polyolefine material.Because the fire resistance of polyolefine material is relatively poor, can reach necessary fire resistance in order to make cable, often in polyolefine material, add a large amount of inorganic combustion inhibitor Al (OH)
3Powder, addition makes viscosity, the hardness of CABLE MATERIALS become big, mobile variation more than 50% so usually.There are the following problems when extruding for high halide-free low-smoke fireproof cable material of filling:
When (1) common screw was extruded, the shear action that CABLE MATERIALS is subjected to was bigger, and the load of extruder is bigger, or the extruder electric current surpasses the specified limit, equipment downtime; Extrusion screw rod low-speed running or locking can not ordinary production.
(2) because CABLE MATERIALS produces strong friction with screw rod and machine barrel in extruder, make CABLE MATERIALS heat up rapidly.Extrusion temperature is difficult to control, when temperature reaches 200 ℃, and Al (OH)
3Can decompose, emit the crystallization water and cause the CABLE MATERIALS foaming, both influence cable outward appearance and mechanical performance index, also lose the fire resistance of cable.
More specifically say: (referring to Fig. 1) is used for the prior art screw rod that cable insulation and sheath extrude and generally is divided into feeding section L1, compression section L2 (or claiming melting section) and three parts of homogenizing zone L3, its segmentation scales is about 3: 5: 2, the length L 1 that is feeding section is 10～25%L, the length L 2 of compression section is 50～60%L, and the degree of depth h3 of its homogenizing zone screw channel is (0.02～0.06) D, and screw head is hemispherical or taper.Plastics are graininess at feeding section, when plastic pellet is advanced to the feeding section end, along with the rising of temperature begins to melt.Plastics enter the compression section and are in molten condition substantially, along with the continuation of temperature raise and with the friction of screw rod, machine barrel, plastics reach good plasticizing and stir uniformly.At homogenizing zone, because the passage between screw rod and the machine barrel is narrow and small, make the plastics of molten condition under more stable pressure, enter head, reach the extruded velocity effect of uniform.When plastics are in graininess, be equivalent between particle and screw rod and machine barrel, particle and the particle contact, its frictional force and frictional heat are very little; When plastics were in molten condition, frictional force between plastics and screw rod and the machine barrel and frictional heat can increase sharply.The size of frictional force has determined the size of machine utilization, the temperature that how much influences plastics of frictional heat.Viscosity is low after the common plastics fusion, good fluidity, so the screw rod rotating load is less.Because frictional heat is few, only depends on frictional heat can not make plastics reach good molten condition, must heat to plastics in the electrically heated mode of machine barrel external application, and it is plastified well.And halide-free low-smoke fireproof cable material viscosity height still when molten condition is mobile poor, produces very big frictional resistance, causes the screw rod increasing of loading.Because the frictional heat height, even without external heat, the temperature of himself giving birth to heat just can surpass the temperature of material breakdown.
Common people adopt the low compression ratio screw rod, and (the common screw compression ratio is 2.5～3.0, the low compression ratio screw rod is about 1.2～1.3) can alleviate the influence of the problems referred to above, but, can not fundamentally solve because common extruder screw length is grown the influence of factors such as (draw ratio of screw rod is 20 or 25) and machine barrel air cooling effect difference.
Studies have shown that, solve the halide-free low-smoke fireproof cable material and extrude the best method of problem and be to use draw ratio little (draw ratio is meant the length of screw rod working portion and the ratio of screw rod external diameter), compression ratio little (compression ratio is meant the volume of first screw channel of screw rod feeding section and the ratio of the volume of last screw channel of homogenizing zone), special-purpose extruder that power of motor is big.For example: draw ratio below 16 times, compression ratio about 1.3.But at cable industry, require an extruder promptly to want to squeeze the halide-free low-smoke fireproof cable material, can squeeze common plastics again, to guarantee effective utilization of equipment.Special-purpose extruder is extruded common CABLE MATERIALS can produce problems such as the plastics plasticizing is bad again, so both are difficult to compatible.
Summary of the invention
The purpose of this utility model provides a kind of screw rod that the halide-free low-smoke fireproof cable plastics are extruded that is used at existing weak point in the above-mentioned prior art just.
The purpose of this utility model mainly is by the feeding section that adds long bolt and shortens the spiral groove depth that compression is short, deepen homogenizing zone, reduce the compression ratio of compression section, and screw head changed into cutting sth. askew truncated cone structure and processing the technical measures such as axial deep hole that can insert cooling water pipe control temperature at the screw rod center realize:
Say that more specifically the draw ratio of screw rod of the present utility model is 20～25: 1, the length of feeding section is 35～45% of screw rod working portion total length, and the length of compression section is 30～40% of screw rod working portion total length; The spiral groove depth of screw rod homogenizing zone is 0.08～0.12 of a screw rod external diameter; The compression ratio ε of compression section is that 1.2～1.4 (compression ratio of compression section is meant the volume of last screw channel of screw rod feeding section and the ratio of the volume of first screw channel of homogenizing zone; And the compression ratio of screw rod is meant the volume of first screw channel of screw rod feeding section and the ratio of the volume of last screw channel of homogenizing zone, because the general spiral groove depth such as employing respectively of feeding section and homogenizing zone, so in fact the compression ratio of compression section is exactly the compression ratio of screw rod); Screw head is the truncated cone structure of cutting sth. askew, its cone-apex angle α: 60 °～120 °, the angle theta of cut sth. askew cross section and screw rod cross section: 10 °～20 °; The screw rod center is processed with the axial deep hole that is used for logical cooling water, and this axial deep hole is extended internally by the rear end, terminates in the intersection of compression section and homogenizing zone.
Operation principle of the present utility model and beneficial effect are as follows:
According to extruding theory, CABLE MATERIALS is molten condition in the compression section, and it is that face contacts with machine barrel, and when screw rod rotated, the shear action that CABLE MATERIALS is subjected to was bigger, CABLE MATERIALS and machine barrel friction and the heat that produces is also bigger.And at feeding section, CABLE MATERIALS is a particle state, and it contacts for point with machine barrel, and when screw rod rotated, the shear action that CABLE MATERIALS is subjected to was less, CABLE MATERIALS and machine barrel friction and the heat that produces is also less.Therefore suitably reduce the screw compression segment length and suitably increase screw rod feeding section length, can effectively reduce CABLE MATERIALS owing to rubbing and shearing the heat that produces.
Increase the spiral groove depth of screw rod homogenizing zone, also can reduce the shear action of screw rod CABLE MATERIALS; The compression ratio that reduces screw rod then can reduce the pressure of material in the machine barrel, thereby reduces the load of extruder.The employing truncated cone screw head of cutting sth. askew can make its end form an elliptic cone cambered surface, and when screw rod rotated, it can play the effect of stirring CABLE MATERIALS, makes that CABLE MATERIALS is difficult to produce decomposition because of stagnation.Logical cooling water can reduce effectively that material is sheared and the heat that produces in the screw rod.
The utility model can be under the condition of using common extruder, be equipped with a common screw and can realize two kinds of materials once the bolt special of basic utility model---be the purpose that halide-free low-smoke fireproof cable material and common plastics all can be extruded, not only improve usage ratio of equipment, also reduced unnecessary equipment input simultaneously.
Accompanying drawing and explanation
Fig. 1 is prior art (common) screw-rod structure schematic diagram.
Symbol description among Fig. 1: D---screw rod external diameter, L---screw rod working portion length, L1---feeding section length, L2---compression section length, L3---homogenizing zone length, h1---feeding section spiral groove depth, h3---homogenizing zone spiral groove depth, S---thread pitch, e---spiral shell rib width, screw rod major parameter: screw slenderness ratio L: D:20～25: 1, thread pitch S: generally equal D, screw compression is than ε: 2.5～3.0, and lead angle φ: 17 °～20 °, feeding section length L 1:(10～25) %L, spiral groove depth h3:(0.02～0.06) D, compression section length L 2:(50～60) %L, spiral groove depth h1: according to D, the value of ε and h3 is calculated, homogenizing zone length L 3:(20～25) %L, spiral shell rib width e: (0.08～0.12) D.
Fig. 2 is the structural representation of this use new screw.
Symbol description among Fig. 2: screw slenderness ratio L: D:20～25: 1, thread pitch S: generally equal D, screw compression is than ε: 1.2～1.4, lead angle φ: 17 °～20 °, feeding section length L 1:(35～45) %L, spiral groove depth h3:(0.08～0.12) D, compression section length L 2:(30～45) %L, spiral groove depth h1: according to D, the value of ε and h3 is calculated, homogenizing zone length L 3:(20～25) %L, spiral shell rib width e: (0.08～0.12) D, screw head cone angle: 60 °～120, screw head angle of chamfer θ: 10 °～20 °, cooling water hole diameter d: decide according to screw rod external diameter size.
The specific embodiment
The utility model does a description below with reference to embodiment (accompanying drawing):
(L: be 20～25: 1 D), the length L 1 of feeding section is 35～45% of a screw rod working portion total length L to the draw ratio of the screw rod of screw rod of the present utility model, and the length L 2 of compression section is 30～40% of a screw rod working portion total length L; The spiral groove depth h3 of screw rod homogenizing zone L3 is 0.08～0.12 of a screw rod outer diameter D; The pitch S of screw rod generally equals the screw rod outer diameter D; Spiral shell rib width e is 0.08～0.12 of a screw rod outer diameter D; The compression ratio ε of compression section is that 1.2～1.4 (compression ratio of compression section is meant the volume of last screw channel of screw rod feeding section and the ratio of the volume of first screw channel of homogenizing zone; And the compression ratio of screw rod is meant the volume of first screw channel of screw rod feeding section and the ratio of the volume of last screw channel of homogenizing zone, because the general spiral groove depth such as employing respectively of feeding section and homogenizing zone, so in fact the compression ratio of compression section is exactly the compression ratio of screw rod); Screw head is the truncated cone structure of cutting sth. askew, its cone-apex angle α: 60 °～120 °, the angle theta of cut sth. askew cross section and screw rod cross section: 10 °～20 °; The screw rod center is processed with the axial deep hole (cooling water hole) that is used for logical cooling water, and this axial deep hole is extended internally by the rear end, terminates in the intersection of compression section and homogenizing zone.
Embodiment 1
The screw rod key dimension:
Screw rod outer diameter D: 120mm, screw rod working portion length L: 2400mm, screw rod feeding section length L 1:960mm, screw compression segment length L2:840mm, screw rod homogenizing zone length L 3:600mm, the screw head cone angle: 60 °, screw head angle of chamfer θ: 15 °, thread pitch S:120mm, lead angle φ: 17 ° 42 ', homogenizing zone spiral groove depth h3:12mm, feeding section spiral groove depth h1:16mm, spiral shell rib width e: 12mm, cooling water hole diameter d: 30mm.
Claims (1)
1, a kind ofly is used for the screw rod that the halide-free low-smoke fireproof cable plastics are extruded, it is characterized in that: the draw ratio of screw rod (L: be 20～25: 1 D), the length of feeding section (L1) is 35～45% of screw rod working portion total length (L), and the length of compression section (L2) is 30～40% of screw rod working portion total length (L); The spiral groove depth (h3) of screw rod homogenizing zone (L3) is 0.08～0.12 of a screw rod external diameter (D); The compression ratio ε of compression section is 1.2～1.4; Screw head is the truncated cone structure of cutting sth. askew, its cone-apex angle α: 60 °～120 °, the angle theta of cut sth. askew cross section and screw rod cross section: 10 °～20 °; The screw rod center is processed with the axial deep hole that is used for logical cooling water, and this axial deep hole is extended internally by the rear end, terminates in the intersection of compression section and homogenizing zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202310869U CN201317097Y (en) | 2008-12-24 | 2008-12-24 | Screw bolt for squeezing halogen-free, low-smoke, fire retardant cable plastic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202310869U CN201317097Y (en) | 2008-12-24 | 2008-12-24 | Screw bolt for squeezing halogen-free, low-smoke, fire retardant cable plastic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201317097Y true CN201317097Y (en) | 2009-09-30 |
Family
ID=41195867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202310869U Expired - Fee Related CN201317097Y (en) | 2008-12-24 | 2008-12-24 | Screw bolt for squeezing halogen-free, low-smoke, fire retardant cable plastic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201317097Y (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101898411A (en) * | 2010-04-27 | 2010-12-01 | 昆山科信橡塑机械有限公司 | Screw special for low-smoke halogen-free material |
| CN102744861A (en) * | 2012-07-30 | 2012-10-24 | 安徽普瑞斯塑料机械制造有限公司 | Special screw for extruding electro-conductive plastic cable material |
| CN104129058A (en) * | 2014-07-30 | 2014-11-05 | 安庆钰龙橡塑机械制造有限公司 | Rubber extruding machine screw |
| CN104139512A (en) * | 2014-07-18 | 2014-11-12 | 江苏绿艳高分子材料有限公司 | Feeding screw for TPU production |
| CN105590669A (en) * | 2016-03-02 | 2016-05-18 | 江苏远方电缆厂有限公司 | Anti-retraction cross-linked polyethylene insulated environmental cable and preparation method thereof |
| CN104515631B (en) * | 2013-09-26 | 2016-08-17 | 纳米新能源（唐山）有限责任公司 | Franklinic electricity pressure induction cable |
| CN110239059A (en) * | 2019-08-01 | 2019-09-17 | 安徽普瑞斯电工机械有限公司 | High-flame-retardance low-smoke halogen-free cable material squeezes out bolt special |
| CN110561708A (en) * | 2019-09-29 | 2019-12-13 | 江苏中煤电缆有限公司 | Low-smoke halogen-free rubber sheath extruder for coal mine |
| CN111430085A (en) * | 2020-04-28 | 2020-07-17 | 河南乐山电缆有限公司 | Method for improving thermal shrinkage performance of overhead insulated cable |
| CN113134959A (en) * | 2021-05-10 | 2021-07-20 | 安庆市九羊电工机械设备有限公司 | Efficient energy-saving screw and extruder |
| CN114038633A (en) * | 2021-12-22 | 2022-02-11 | 中天科技海缆股份有限公司 | Plastic extruding machine and manufacturing method of polypropylene insulated cable |
-
2008
- 2008-12-24 CN CNU2008202310869U patent/CN201317097Y/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101898411A (en) * | 2010-04-27 | 2010-12-01 | 昆山科信橡塑机械有限公司 | Screw special for low-smoke halogen-free material |
| CN102744861A (en) * | 2012-07-30 | 2012-10-24 | 安徽普瑞斯塑料机械制造有限公司 | Special screw for extruding electro-conductive plastic cable material |
| CN102744861B (en) * | 2012-07-30 | 2014-08-06 | 安徽普瑞斯塑料机械制造有限公司 | Special screw for extruding electro-conductive plastic cable material |
| CN104515631B (en) * | 2013-09-26 | 2016-08-17 | 纳米新能源（唐山）有限责任公司 | Franklinic electricity pressure induction cable |
| CN104139512A (en) * | 2014-07-18 | 2014-11-12 | 江苏绿艳高分子材料有限公司 | Feeding screw for TPU production |
| CN104129058A (en) * | 2014-07-30 | 2014-11-05 | 安庆钰龙橡塑机械制造有限公司 | Rubber extruding machine screw |
| CN105590669A (en) * | 2016-03-02 | 2016-05-18 | 江苏远方电缆厂有限公司 | Anti-retraction cross-linked polyethylene insulated environmental cable and preparation method thereof |
| CN110239059A (en) * | 2019-08-01 | 2019-09-17 | 安徽普瑞斯电工机械有限公司 | High-flame-retardance low-smoke halogen-free cable material squeezes out bolt special |
| CN110239059B (en) * | 2019-08-01 | 2023-10-13 | 安徽普瑞斯电工机械有限公司 | Special screw rod for extruding high-flame-retardant low-smoke halogen-free cable material |
| CN110561708A (en) * | 2019-09-29 | 2019-12-13 | 江苏中煤电缆有限公司 | Low-smoke halogen-free rubber sheath extruder for coal mine |
| CN110561708B (en) * | 2019-09-29 | 2024-06-07 | 江苏中煤电缆有限公司 | Low-smoke halogen-free rubber sheath extruder for coal mine |
| CN111430085A (en) * | 2020-04-28 | 2020-07-17 | 河南乐山电缆有限公司 | Method for improving thermal shrinkage performance of overhead insulated cable |
| CN113134959A (en) * | 2021-05-10 | 2021-07-20 | 安庆市九羊电工机械设备有限公司 | Efficient energy-saving screw and extruder |
| CN114038633A (en) * | 2021-12-22 | 2022-02-11 | 中天科技海缆股份有限公司 | Plastic extruding machine and manufacturing method of polypropylene insulated cable |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201317097Y (en) | Screw bolt for squeezing halogen-free, low-smoke, fire retardant cable plastic | |
| CN103524950A (en) | PVC extrusion grade particulate material and preparation method thereof, and preparation method of extrusion product | |
| CN101774269A (en) | High-speed PB tube single screw | |
| CN111571987A (en) | Energy-saving combined screw for PET bottle flake material | |
| CN104589618B (en) | Special two-section BM type screw rod for wire and cable extruder | |
| CN203198215U (en) | Extrusion forming device based on hard PVC (Polyvinyl Chloride) door-window profiled bar | |
| CN203557672U (en) | Forced material pushing type rubber extruding machine screw rod | |
| CN106633176B (en) | Continuous recovery machine and recovery process for waste rubber | |
| CN202623253U (en) | Plastic extrusion machine | |
| CN210336822U (en) | Special screw for extruding high-flame-retardant low-smoke halogen-free cable material | |
| CN204526092U (en) | The special two sections of BM formula screw rods of electric wire extruder | |
| CN104607883A (en) | Insert core manufacturing process for industrial plugs | |
| CN205097492U (en) | Promote extruder of PVC section bar rerum natura | |
| CN204505776U (en) | A kind of extruder | |
| CN220946598U (en) | Special screw rod of fire-retardant sheath cable extrusion of low smoke and zero halogen | |
| CN203093022U (en) | Screw for double-screw extruder for producing antiseptic powder coating | |
| CN210880808U (en) | Screw rod for low-temperature foaming material extrusion molding | |
| CN217834660U (en) | Special extrusion screw for low-smoke halogen-free flame-retardant cable material | |
| CN220946597U (en) | Special screw rod of high-efficient polyvinyl chloride sheath cable extrusion | |
| CN202623243U (en) | Plastic extruding machine with conical screw | |
| CN202540682U (en) | Extruder with separating-type screw | |
| CN205853328U (en) | A kind of extruder screw for lazy flow plastic processing | |
| CN103587100A (en) | Screw rod of forced material pushing type rubber extruding machine | |
| CN212331507U (en) | Production equipment for foaming polypropylene master batch | |
| CN219789222U (en) | Building heat insulation material extrusion super wear-resistant threaded block |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20091016 Address after: No. two, 108 North Road, Zhengzhou economic and Technological Development Zone, Henan, Zhengzhou Province: 450016 Co-patentee after: China-Kinwa High Technology Co., Ltd. Patentee after: Zhengzhou Cable Co., Ltd. Address before: No. two, 108 North Road, Zhengzhou economic and Technological Development Zone, Henan, Zhengzhou Province: 450016 Patentee before: Zhengzhou Cable Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090930 Termination date: 20111224 |