CN102990900A - Single screw extruder for forming propellant with high solid content - Google Patents
Single screw extruder for forming propellant with high solid content Download PDFInfo
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- CN102990900A CN102990900A CN2012104616795A CN201210461679A CN102990900A CN 102990900 A CN102990900 A CN 102990900A CN 2012104616795 A CN2012104616795 A CN 2012104616795A CN 201210461679 A CN201210461679 A CN 201210461679A CN 102990900 A CN102990900 A CN 102990900A
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- screw
- screw rod
- section
- groove depth
- propellant
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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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/53—Screws having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk
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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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a single screw extruder for forming a propellant with a high solid content. The single screw extruder comprises a cylinder, a screw, a feeding hopper and a transmission system, wherein the cylinder is formed by a cylinder body steel sleeve and a groove bushing; a rectangular metal casing defecting design is carried out on the cylinder body steel sleeve in the axial direction and the circumferential direction, i.e. special pressure and explosion relief windows are formed; rectangular through grooves parallel to the axial center line of the cylinder body and evenly distributed around the circumference of the cylinder body are formed on the inner side and the outer side of the groove bushing, so that pressure and explosion relief walls are formed; the screw is an isometric columnar mutation type screw with double heads; a core hole through which heating water passes is formed in the center of the screw; and the screw is composed of a feeding segment with a relatively deep spiral groove, a metering segment and a mutating segment with short length. The single screw extruder provided by the invention can be used for safely, effectively and stably forming the propellant with the high solid content in an extrusion manner.
Description
Technical field
The present invention relates to a kind of extruder of formation solid propellant, especially relate to a kind of single screw extrusion machine for the highly filled propellant of moulding.
Background technology
The existing conical screw extruder that is used for the formation solid propellant of China is to introduce the modified double base propellant that it is only applicable to double base propellant and contains a small amount of RDX, HMX the fifties in last century from the Soviet Union.For highly filled propellant, because it contains the solid constituents such as a large amount of RDX, HMX, so little than common double-base solid propellant of the compressibility of material self, shear strength and coefficient of friction.If process highly filled propellant with existing conical screw extruder, because conical screw self compression ratio is larger, causes that easily the head resistance is excessive, thereby cause material in machine barrel, to come to a halt, even batch turning occurs.The zigzag groove dischargeable capacity that the groove lining inwall of existing conical screw extruder is offered is less, can not tighten well the lower highly filled propellant grain of coefficient of friction, so that the upbuild voltage capacity of feeding section weakens, thereby reduced mass transport efficient, the goods compactness of extruding is bad.The feeding section transfer efficiency is surveyed to reduce and may be caused the reach of material plasticizing section, material transition plasticizing, and then the shear strength of feeding section solid plug is reduced, thus cause the material that embeds machine barrel lining groove to be cut off, make material embrace the screw rod rotation, namely begin to skid.The safety device of existing conical screw extruder is to prevent from blasting owing to head pressure is too high by the venting of dust explosion ring is set between cylindrical shell and head, this venting of dust explosion ring only just plays the effect of pressure release venting of dust explosion at cross-head pressure above under the critical pressure state, to the dangerous phenomenons such as superpressure, the overtemperature that produces in the highly filled propellant process middle cylinder body fires and inoperative.
Summary of the invention
The object of the invention is to, a kind of transfer efficiency height, the safe and reliable single screw extrusion machine of extruding highly filled propellant are provided.
In order to realize above-mentioned task, the present invention is achieved by the following technical solutions:
A kind of single screw extrusion machine for the highly filled propellant of moulding, comprise machine barrel, screw rod, loading hopper and transmission system, it is characterized in that, described machine barrel is comprised of cylindrical shell steel bushing and groove lining, described machine barrel steel bushing is offered special pressure release venting of dust explosion window along the axial and circumferential directions, and the outer wall of groove lining is provided with the formed pressure release venting of dust explosion of the rectangular through slot wall that is parallel to cylindrical shell steel bushing axial line and distributes around even circumferential;
Described screw rod is equidistant double end column saltant screw rod, and the center has the core hole for the heating water circulation, and the draw ratio of screw rod is 3.0～4.0, and compression ratio is 1.5～2.0, and the pitch of screw rod is 35%～45% of screw diameter; Helicla flute on the screw rod is divided into feeding section, sudden change section and metering section; Wherein, the spiral groove depth of feeding section is 16%～25% of screw diameter, the spiral groove depth of metering section is 8%～10% of screw diameter, the groove depth of sudden change section initiating terminal is the groove depth of feeding section, the groove depth that the sudden change section finishes end is the groove depth of metering section, and the length of sudden change section is 20%～40% of screw diameter.
Pressure release venting of dust explosion number of windows on the described machine barrel steel bushing is 3～15, is shaped as rectangle, and the rectangular through slot quantity of groove lining inside and outside wall, width equate and corresponding the setting that the thickness of pressure release venting of dust explosion wall is 4%～8% of screw diameter.
Single screw extrusion machine for the highly filled propellant of moulding of the present invention compared with prior art, has the following advantages:
Owing to be provided with pressure release venting of dust explosion window and the groove lining is provided with pressure release venting of dust explosion wall at the machine barrel steel bushing, when screw extruder course of work middle cylinder body internal pressure surpasses design pressure, destroy lining pressure release venting of dust explosion wall, by the pressure release venting of dust explosion window on the steel bushing compression shock is discharged, guaranteed the safety of system equipment and the person.
The rectangular through slot of groove lining inwall can be good at blocking the lower highly filled propellant grain of coefficient of friction, increased lining inwall and material, material and material bed 's frictional force, thereby so that feeding section pressure increases rapidly, mass transport efficient improves; The spiral groove depth that feeding section and metering section are larger has avoided material to be subject to strong shearing, has reduced the stickiness Heat of Formation; Short draw ratio has guaranteed that temperature of charge raises within effective limit, has avoided because excess Temperature causes the decomposition of material so that material shortened in the time of staying of machine barrel.
Description of drawings
Fig. 1 is cylindrical shell screw stem combined structure figure.
Fig. 2 is screw-rod structure figure.
Fig. 3 is groove lining radial cross-section.
Fig. 4 is the axial cutaway view of groove lining.
Fig. 5 is cylindrical shell steel bushing radial cross-section.
Each mark represents respectively among the figure: 1, groove lining, 2, the lining water jacket, 3, the lining inside groove, 4, cylindrical shell overcoat pressure release venting of dust explosion window, 5, the cylindrical shell steel bushing, 6, screw rod, 7, material, 8, pressure release venting of dust explosion wall.
Below in conjunction with accompanying drawing and implementation technology the present invention is described in further detail.
The specific embodiment
Referring to Fig. 1, present embodiment provides a kind of single screw extrusion machine for the highly filled propellant of moulding, at least include machine barrel, screw rod, loading hopper and transmission system, wherein machine barrel is comprised of cylindrical shell steel bushing 5 and groove lining 1, machine barrel steel bushing 5 carries out the damaged design of rectangular metal housing along the axial and circumferential directions, namely offer special pressure release venting of dust explosion window 4, the outer wall of groove lining 4 is provided with the rectangular through slot that is parallel to cylindrical shell steel bushing 5 axial lines and distributes around even circumferential and forms pressure release venting of dust explosion wall 8.
In the present embodiment, screw rod 6 is equidistant double end column saltant screw rod, and the screw rod center has the core hole for the heating water circulation, and the draw ratio of screw rod 6 is 3.0～4.0, and compression ratio is 1.5～2.0, and the pitch of screw rod 6 is 35%～45% of screw diameter; Helicla flute on the screw rod 6 is divided into the darker feeding section L1 of screw channel, length short sudden change section L2 and metering section L3; Wherein, the spiral groove depth of feeding section L1 (H1) is 16%～25% of screw rod (6) diameter, the spiral groove depth H3 of metering section L3 is 8%～10% of screw rod 6 diameters, the groove depth of sudden change section L2 initiating terminal is the groove depth of feeding section L1, the groove depth that sudden change section L2 finishes end is the groove depth of metering section L3, and the length of sudden change section L2 is that 20%～40%(of screw diameter namely is not more than 0.5 circle screw thread).
The quantity that quick-fried window 4 is rushed down in pressure release on the machine barrel steel bushing 5 is 3～15, is shaped as rectangle, and the rectangular through slot quantity of the outer wall of groove lining 1, width equate and corresponding the setting that the thickness of pressure release venting of dust explosion wall 8 is 4%～8% of screw rod 6 diameters.
It below is the application example of the single screw extrusion machine that is used for the highly filled propellant of moulding of the employing above-described embodiment preparation that provides of inventor.
Embodiment 1:
This is implemented used material formula and forms as shown in table 1ly, and the elementary structure parameter of single screw extrusion machine (hereinafter referred to as single screw extrusion machine) that is used for the highly filled propellant of moulding is as shown in table 2, and the technological temperature parameter is as shown in table 3.
Table 1: material formula forms
Table 2: elementary structure parameter
Table 3: technological temperature parameter
In the present embodiment, the course of work of single screw extrusion machine is: material 7 enters the feeding section L1 of screw rod 6 from loading hopper, material 7 travels forward along the screw channel direction under itself and the 5 inwall shearing friction effects of machine barrel lining, because the great friction coefficient of groove lining 5, so that material 7 is compressed into rapidly solid plug, feeding section L1 pressure also raises rapidly, material 7 begins melting under the effect of shearing and heat, gradually viscous deformation occuring and begins bonding, when material 7 process sudden change section L2, because spiral groove depth is undergone mutation, material 7 is subject to strong shear action and further plasticizing and compacting, sweeps along the gas in material 7 to be discharged by charge door under this strong extruding, when material 7 enters metering section L3, material 7 further meltings, mix, homogenizing enters mould molding at last.
In extrusion, the load variations situation of single screw extrusion machine is as shown in table 4, the highly filled performance of propellant of table 5 for extruding.
When occurring pressure when overload in the single screw extrusion machine course of work, destroy pressure release venting of dust explosion wall 8, pressure release venting of dust explosion window by cylindrical shell steel bushing 54 is released compression shock, has guaranteed the safety of equipment and the person.
Table 4: the load variations situation of single screw extrusion machine in the extrusion
Table 5: the highly filled performance of propellant of extruding
As seen from Table 4, load variations is steady in the single screw extrusion machine course of work, extrude the fluctuation little, each mate of structural parameters of extruder is good.As can be seen from Table 5, the highly filled performance of propellant of extruding is good, and density is larger.From the flaw detection structural analysis, the interiors of products structure is closely knit, pore-free and loose phenomenon.Find in the experimentation that under identical screw speed, output is identical with existing φ 120 conical screw extruders.
Claims (2)
1. single screw extrusion machine that is used for the highly filled propellant of moulding, comprise machine barrel, screw rod (6), loading hopper and transmission system, it is characterized in that, described machine barrel is comprised of cylindrical shell steel bushing (5) and groove lining (1), described machine barrel steel bushing (5) is offered special pressure release venting of dust explosion window (4) along the axial and circumferential directions, and the outer wall of groove lining (1) is provided with the formed pressure release venting of dust explosion of the rectangular through slot wall (8) that is parallel to cylindrical shell steel bushing (5) axial line and distributes around even circumferential;
Described screw rod (6) is equidistant double end column saltant screw rod, and the center has the core hole for the heating water circulation, and the draw ratio of screw rod (6) is 3.0～4.0, and compression ratio is 1.5～2.0, and the pitch of screw rod (6) is 35%～45% of screw diameter; Helicla flute on the screw rod (6) is divided into feeding section (L1), sudden change section (L2) and metering section (L3); Wherein, the spiral groove depth (H1) of feeding section (L1) is 16%～25% of screw rod (6) diameter, the spiral groove depth (H3) of metering section (L3) is 8%～10% of screw rod (6) diameter, the groove depth of sudden change section (L2) initiating terminal is the groove depth of feeding section L1, the groove depth that sudden change section (L2) finishes end is the groove depth of metering section (L3), and the length of sudden change section (L2) is 20%～40% of screw diameter.
2. the single screw extrusion machine for the highly filled propellant of moulding as claimed in claim 1 is characterized in that, pressure release venting of dust explosion window (4) quantity on the described machine barrel steel bushing (5) is 3～15, is shaped as rectangle; The rectangular through slot quantity of described groove lining (1) inside and outside wall, width equate and corresponding the setting that the thickness of pressure release venting of dust explosion wall (8) is 4%～8% of screw diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210461679.5A CN102990900B (en) | 2012-11-15 | 2012-11-15 | Single screw extruder for forming propellant with high solid content |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210461679.5A CN102990900B (en) | 2012-11-15 | 2012-11-15 | Single screw extruder for forming propellant with high solid content |
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| Publication Number | Publication Date |
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| CN102990900A true CN102990900A (en) | 2013-03-27 |
| CN102990900B CN102990900B (en) | 2015-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210461679.5A Active CN102990900B (en) | 2012-11-15 | 2012-11-15 | Single screw extruder for forming propellant with high solid content |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103317701A (en) * | 2013-06-27 | 2013-09-25 | 苏州科茂电子材料科技有限公司 | Urgent compression screw rod for ultrathin coaxial line extruder |
| CN103698227A (en) * | 2013-11-28 | 2014-04-02 | 西安近代化学研究所 | Device for measuring process temperature of screw rod and material in screw extrusion molding process of screw extrusion propellant |
| CN108579978A (en) * | 2018-06-19 | 2018-09-28 | 南宁职业技术学院 | Screw transporter and its screw sleeve |
| CN110142499A (en) * | 2019-04-23 | 2019-08-20 | 南昌航空大学 | One kind rubs extrusion method and device from feed paddle head, from feed paddle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2126515Y (en) * | 1992-07-25 | 1993-01-06 | 北京化工学院 | Wave-like high effective injection screw stem |
| CN102173085A (en) * | 2011-02-11 | 2011-09-07 | 北京理工大学 | Method and device for extrusion molding and explosion-proof relief of sensitive materials |
| CN102213648A (en) * | 2011-04-02 | 2011-10-12 | 北京化工大学 | Online simulation testing machine for screw extrusion solid transportation section and measurement method |
-
2012
- 2012-11-15 CN CN201210461679.5A patent/CN102990900B/en active Active
Patent Citations (3)
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|---|---|---|---|---|
| CN2126515Y (en) * | 1992-07-25 | 1993-01-06 | 北京化工学院 | Wave-like high effective injection screw stem |
| CN102173085A (en) * | 2011-02-11 | 2011-09-07 | 北京理工大学 | Method and device for extrusion molding and explosion-proof relief of sensitive materials |
| CN102213648A (en) * | 2011-04-02 | 2011-10-12 | 北京化工大学 | Online simulation testing machine for screw extrusion solid transportation section and measurement method |
Non-Patent Citations (1)
| Title |
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| 韩民园，等: "螺杆结构对一种改性双基推进剂代用料加工工艺的影响", 《固体火箭技术》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103317701A (en) * | 2013-06-27 | 2013-09-25 | 苏州科茂电子材料科技有限公司 | Urgent compression screw rod for ultrathin coaxial line extruder |
| CN103698227A (en) * | 2013-11-28 | 2014-04-02 | 西安近代化学研究所 | Device for measuring process temperature of screw rod and material in screw extrusion molding process of screw extrusion propellant |
| CN103698227B (en) * | 2013-11-28 | 2015-12-30 | 西安近代化学研究所 | Screw rod and material technological temperature measurement mechanism in the molded process of spiral shell pressure propellant spiral shell |
| CN108579978A (en) * | 2018-06-19 | 2018-09-28 | 南宁职业技术学院 | Screw transporter and its screw sleeve |
| CN108579978B (en) * | 2018-06-19 | 2023-06-02 | 南宁职业技术学院 | Screw conveying device and screw sleeve thereof |
| CN110142499A (en) * | 2019-04-23 | 2019-08-20 | 南昌航空大学 | One kind rubs extrusion method and device from feed paddle head, from feed paddle |
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| Publication number | Publication date |
|---|---|
| CN102990900B (en) | 2015-02-11 |
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