CN102990900B - 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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- CN102990900B CN102990900B CN201210461679.5A CN201210461679A CN102990900B CN 102990900 B CN102990900 B CN 102990900B CN 201210461679 A CN201210461679 A CN 201210461679A CN 102990900 B CN102990900 B CN 102990900B
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- screw
- screw rod
- propellant
- solid content
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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
- 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
-
- 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 shaping propellant with high solid content.
Background technology
The existing conical screw extruder for formation solid propellant of China, be introduce from the Soviet Union fifties in last century, it is only applicable to double base propellant and the modified double base propellant containing a small amount of RDX, HMX.For propellant with high solid content, contain the solid constituents such as a large amount of RDX, HMX due to it, therefore little than common double-base solid propellant of the compressibility of material self, shear strength and coefficient of friction.If by existing conical screw extruder processing propellant with high solid content, because conical screw self compression ratio is comparatively large, easily causes head resistance excessive, thus cause material to come to a halt in machine barrel, even occur batch turning.The zigzag groove dischargeable capacity that the groove lining inwall of existing conical screw extruder is offered is less, the propellant with high solid content particle that coefficient of friction is lower can not be clamped well, the upbuild voltage capacity of feeding section is weakened, thus reducing mass transport efficiency, the goods compactness extruded is bad.Feeding section transfer efficiency is surveyed reduction and material plasticizing section may be caused to move forward, and material transition plastifies, and then the shear strength of feeding section solid plug is reduced, thus causes the material embedding barrel liner groove to be cut off, and makes material embrace screw rod and rotates, namely start to skid.The safety device of existing conical screw extruder prevents because head pressure is too high and blast by arranging venting of dust explosion ring between cylindrical shell and head, this venting of dust explosion ring only just plays the effect of pressure release venting of dust explosion under cross-head pressure exceedes critical pressure state, inoperative to dangerous phenomenons such as the superpressure produced in propellant with high solid content process middle cylinder body, overtemperature fire.
Summary of the invention
The object of the invention is to, provide a kind of transfer efficiency high, the safe and reliable single screw extrusion machine extruding propellant with high solid content.
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 shaping propellant with high solid content, comprise machine barrel, screw rod, loading hopper and transmission system, it is characterized in that, described machine barrel is made up of cylindrical shell steel bushing and groove lining, special pressure release venting of dust explosion window offered along the axial and circumferential directions by described machine barrel steel bushing, and the outer wall of groove lining is provided with and is parallel to cylindrical shell steel bushing axial line and the circumferentially pressure release venting of dust explosion wall that formed of equally distributed rectangular through slot;
Described screw rod is equidistant double end column saltant type screw rod, and center has the core bore for 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 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 sudden change section terminates to hold 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 described machine barrel steel bushing is 3 ~ 15, and shape is rectangle, and the equal and corresponding setting of the rectangular through slot quantity of groove lining inside and outside wall, width, the thickness of pressure release venting of dust explosion wall is 4% ~ 8% of screw diameter.
Single screw extrusion machine for shaping propellant with high solid content of the present invention, compared with prior art, has the following advantages:
Pressure release venting of dust explosion wall is provided with owing to being provided with on machine barrel steel bushing on pressure release venting of dust explosion window and groove lining, when in screw extruder course of work middle cylinder body, pressure exceedes design pressure, destroy lining pressure release venting of dust explosion wall, by the pressure release venting of dust explosion window on steel bushing, compression shock is discharged, ensure that the safety of system equipment and the person.
The rectangular through slot of groove lining inwall can be good at blocking the lower propellant with high solid content particle of coefficient of friction, add lining inwall and material, material and material bed between frictional force, thus feeding section pressure is increased rapidly, mass transport efficiency improves; Feeding section and the larger spiral groove depth of metering section avoid material and are subject to strong shearing, reduce stickiness Heat of Formation; Shorter draw ratio makes material at the shorter residence time of machine barrel, ensure that temperature of charge raises within effective limit, avoids the decomposition causing material because temperature is too high.
Accompanying drawing explanation
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 sectional view of groove lining.
Fig. 5 is cylindrical shell steel bushing radial cross-section.
In figure, each mark represents respectively: 1, groove lining, 2, lining water jacket, 3, lining inside groove, 4, cylindrical shell overcoat pressure release venting of dust explosion window, 5, cylindrical shell steel bushing, 6, screw rod, 7, material, 8, pressure release venting of dust explosion wall.
Below in conjunction with accompanying drawing and concrete enforcement technology, the present invention is described in further detail.
Detailed description of the invention
See Fig. 1, the present embodiment provides a kind of single screw extrusion machine for shaping propellant with high solid content, at least include machine barrel, screw rod, loading hopper and transmission system, wherein machine barrel is made up of cylindrical shell steel bushing 5 and groove lining 1, machine barrel steel bushing 5 carries out the design of rectangular metal case defect 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 and is parallel to cylindrical shell steel bushing 5 axial line and circumferentially equally distributed rectangular through slot forms pressure release venting of dust explosion wall 8.
In the present embodiment, screw rod 6 is equidistant double end column saltant type screw rod, and pitch has the core bore for 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; The sudden change section L2 that the feeding section L1 that helicla flute on screw rod 6 is divided into screw channel darker, length are shorter 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 terminates to hold is the groove depth of metering section L3, and the length of sudden change section L2 is that namely 20% ~ 40%(of screw diameter is not more than 0.5 circle screw thread).
The quantity that quick-fried window 4 is rushed down in pressure release on machine barrel steel bushing 5 is 3 ~ 15, and shape is rectangle, and the equal and corresponding setting of the rectangular through slot quantity of the outer wall of groove lining 1, width, the thickness of pressure release venting of dust explosion wall 8 is 4% ~ 8% of screw rod 6 diameter.
It is below the application example of the single screw extrusion machine for shaping propellant with high solid content prepared by employing above-described embodiment that inventor provides.
Embodiment 1:
It is as shown in table 1 that this implements material formula used composition, and the elementary structure parameter for the single screw extrusion machine (hereinafter referred to as single screw extrusion machine) of shaping propellant with high solid content is as shown in table 2, and 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 screw channel direction under itself and the effect of barrel liner 5 inwall shearing friction, due to the great friction coefficient of groove lining 5, material 7 is made to be compressed into solid plug rapidly, feeding section L1 pressure also raises rapidly, material 7 is being sheared and is being started melting under hot effect, there is viscous deformation gradually and start bonding, when material 7 is through sudden change section L2, because spiral groove depth is undergone mutation, material 7 is subject to strong shear action and plastifies further and compacting, the gas in material 7 is swept along to be discharged by charge door under this by force extruding, when material 7 enters metering section L3, material 7 melting further, mixing, homogenizing, finally enter mould molding.
In extrusion, the load variations situation of single screw extrusion machine is as shown in table 4, the propellant with high solid content performance of table 5 for extruding.
When there is pressure overload in the single screw extrusion machine course of work, destroying pressure release venting of dust explosion wall 8, by the pressure release venting of dust explosion window 4 of cylindrical shell steel bushing 5, compression shock being released, ensure that the safety of equipment and the person.
Table 4: the load variations situation of single screw extrusion machine in extrusion
Table 5: the propellant with high solid content performance extruded
As seen from Table 4, in the single screw extrusion machine course of work, load variations is steady, and it is little to extrude fluctuation, and each mate of structural parameters of extruder is good.As can be seen from Table 5, the propellant with high solid content extruded is functional, and density is larger.From flaw detection structural analysis, interiors of products structure is closely knit, pore-free and loose phenomenon.Find in experimentation, under identical screw speed, output is identical with existing φ 120 conical screw extruder.
Claims (2)
1. the single screw extrusion machine for shaping propellant with high solid content, comprise machine barrel, screw rod (6), loading hopper and transmission system, it is characterized in that, described machine barrel is made up of cylindrical shell steel bushing (5) and groove lining (1), described cylindrical shell steel bushing (5) offers 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 and is parallel to cylindrical shell steel bushing (5) axial line and the circumferentially pressure release venting of dust explosion wall (8) that formed of equally distributed rectangular through slot;
Described screw rod (6) is equidistant double end column saltant type screw rod, center has the core bore for heating water circulation, 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 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) terminates to hold is the groove depth of metering section (L3), and the length of sudden change section (L2) is 20% ~ 40% of screw diameter.
2., as claimed in claim 1 for the single screw extrusion machine of shaping propellant with high solid content, it is characterized in that, pressure release venting of dust explosion window (4) quantity on described cylindrical shell steel bushing (5) is 3 ~ 15, and shape is rectangle; Equal and the corresponding setting of the rectangular through slot quantity of described groove lining (1) inside and outside wall, width, 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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| CN102990900A CN102990900A (en) | 2013-03-27 |
| CN102990900B true CN102990900B (en) | 2015-02-11 |
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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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Families Citing this family (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 |
| 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 |
| CN108579978B (en) * | 2018-06-19 | 2023-06-02 | 南宁职业技术学院 | Screw conveying device and screw sleeve thereof |
| CN110142499B (en) * | 2019-04-23 | 2022-07-22 | 南昌航空大学 | Self-feeding stirring head, self-feeding stirring friction extrusion method and device |
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)
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 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》.2011,第34卷(第5期),第632-634、647页. * |
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| CN102990900A (en) | 2013-03-27 |
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