CN103057088B - Tensile deformation strengthening method based on reverse eccentric double thread groove and screw - Google Patents
Tensile deformation strengthening method based on reverse eccentric double thread groove and screw Download PDFInfo
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- CN103057088B CN103057088B CN201210560816.0A CN201210560816A CN103057088B CN 103057088 B CN103057088 B CN 103057088B CN 201210560816 A CN201210560816 A CN 201210560816A CN 103057088 B CN103057088 B CN 103057088B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005728 strengthening Methods 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 abstract description 11
- 239000002861 polymer material Substances 0.000 abstract description 10
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 238000006731 degradation reaction Methods 0.000 abstract description 2
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 230000009471 action Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000930 thermomechanical effect Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/64—Screws with two or more threads
- B29C48/65—Screws with two or more threads neighbouring threads or channels having different configurations, e.g. one thread being lower than its neighbouring thread
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
本发明公开了基于反向偏心双螺纹槽的拉伸形变作用强化方法及螺杆。通过在单螺杆螺纹槽中增设低于主螺棱的副螺棱，将螺纹槽分成反向偏心双螺纹槽，利用螺杆旋转时，双螺纹槽深度以180度相位差周期性由大变小再由小变大，使物料在塑化输运过程中的拉伸形变作用被强化。实现该方法的螺杆由主螺棱，副螺棱和反向偏心的双螺纹槽构成，主螺棱和副螺棱间隔分布，相邻螺纹槽相对于旋转轴线往呈对称偏心排布；螺杆旋转时，物料随螺纹槽与料筒之间的间隙变化被塑化输送，可以强化拉伸形变作用。本发明能实现高分子材料的高效塑化输送，达到降低能耗，减少降解的效果。
The invention discloses a stretching deformation strengthening method based on reverse eccentric double screw grooves and a screw rod. By adding an auxiliary flight lower than the main flight in the single-screw flight groove, the flight groove is divided into reverse eccentric double flight grooves. When the screw is rotated, the depth of the double flight grooves is periodically changed from large to small with a phase difference of 180 degrees. From small to large, the tensile deformation of the material in the process of plasticizing and transporting is strengthened. The screw to realize this method is composed of a main flight, a secondary flight and reverse eccentric double thread grooves, the main flight and the secondary flight are distributed at intervals, and the adjacent thread grooves are arranged symmetrically and eccentrically with respect to the axis of rotation; the screw rotates At this time, the material is plasticized and conveyed with the change of the gap between the thread groove and the barrel, which can strengthen the tensile deformation effect. The invention can realize high-efficiency plasticized transportation of polymer materials, and achieve the effects of reducing energy consumption and degradation.
Description
技术领域technical field
本发明涉及高分子材料塑化加工方法与设备，具体是指一种高分子材料加工用基于反向偏心双螺纹槽的拉伸形变作用强化方法及螺杆。The invention relates to a polymer material plasticizing processing method and equipment, in particular to a tensile deformation strengthening method and a screw rod for polymer material processing based on reverse eccentric double thread grooves.
技术背景technical background
螺杆机械是目前普遍采用的高分子材料输运装备的核心，螺杆机械中螺棱轴线一般与螺槽的轴线同心旋转，物料塑化输运主要靠螺杆旋转时对物料的拖曳作用，固体输送为摩擦拖曳，熔体输送为粘性拖曳，物料的速度梯度与其流动和变形方向垂直，流动与变形主要受剪切应力支配。这种普通单螺杆的输送方式普遍存在塑化能力差，能耗高，物料适应性差等缺陷。因此在螺杆机械中通常采取对料筒的固体输送段开槽以增加与物流的摩擦力、增大螺杆长径比、优化螺杆结构等措施可以在一定程度上解决上述问题，但这些措施又势必造成物料塑化输运所经历的热机械历程加长、设备结构体积大、物料易降解等缺点。The screw machine is the core of the polymer material transportation equipment commonly used at present. The axis of the screw edge in the screw machine generally rotates concentrically with the axis of the screw groove. The plasticizing and transporting of materials mainly depends on the dragging effect on the material when the screw rotates. The solid transport is Frictional drag, melt transport is viscous drag, the velocity gradient of the material is perpendicular to the flow and deformation direction, and the flow and deformation are mainly dominated by shear stress. This ordinary single-screw conveying method generally has defects such as poor plasticizing ability, high energy consumption, and poor material adaptability. Therefore, in the screw machine, measures such as slotting the solid conveying section of the barrel to increase the friction with the material, increasing the length-to-diameter ratio of the screw, and optimizing the screw structure can solve the above problems to a certain extent, but these measures are bound to be This results in the lengthening of the thermomechanical process experienced by the plasticized transportation of the material, the large volume of the equipment structure, and the easy degradation of the material.
基于拉伸形变的高分子材料叶片塑化输运设备解决了上述问题，能实现热机械历程大大缩短，塑化输运能耗降低，输送效率提高、物料适应性广泛等优点，但叶片塑化输运设备零件构成复杂，装拆不方便。The polymer material blade plasticizing transportation equipment based on tensile deformation solves the above problems, and can realize the advantages of greatly shortening the thermomechanical process, reducing the energy consumption of plasticizing transportation, improving the transportation efficiency, and wide adaptability of materials. The components of the transportation equipment are complex in composition and inconvenient to assemble and disassemble.
发明内容Contents of the invention
本发明的目的是针对以上技术与设备中存在的问题，提供一种基于反向偏心双螺纹槽的拉伸形变作用强化方法及螺杆，以解决高分子材料加工过程中的能耗高、设备结构复杂、物料适应性差等问题。The object of the present invention is to solve the problems existing in the above technologies and equipment, and provide a method for strengthening the tensile deformation effect and a screw based on reverse eccentric double thread grooves, so as to solve the problems of high energy consumption and equipment structure in the process of processing polymer materials. Complexity, poor material adaptability and other issues.
本发明的目的通过如下技术方案实现：The purpose of the present invention is achieved through the following technical solutions:
一种基于反向偏心双螺纹槽的拉伸形变作用强化方法：单螺杆旋转时，充满反向偏心第一螺纹槽和第二螺纹槽的物料，随第一螺纹槽和第二螺纹槽与料筒的间隙以180度相位差周期性由大变小再由小变大而向前输送，使物料在塑化输运过程中的拉伸形变作用被强化。A tensile deformation strengthening method based on reverse eccentric double screw grooves: when the single screw rotates, the material filled with the reverse eccentric first screw groove and the second screw groove, along with the first screw groove and the second screw groove and the material The gap of the barrel is periodically changed from large to small and then from small to large with a phase difference of 180 degrees to convey forward, so that the tensile deformation of the material in the process of plasticizing and transporting is strengthened.
一种基于反向偏心双螺纹槽的拉伸形变作用强化螺杆：单螺杆上设有螺旋的主螺棱，主螺棱的螺旋间隔中增设有副螺棱，副螺棱的直径小于主螺棱的直径；从单螺杆的顶端看，形成主螺棱与副螺棱之间的第一螺纹槽，以及副螺棱与主螺棱之间的第二螺纹槽；相对于单螺杆的旋转轴线，第一螺纹槽和第二螺纹槽的偏心量相同而偏心方向相反；偏心量大于0，小于第一螺纹槽和第二螺纹槽的半径与料筒半径之差。A tensile deformation strengthening screw based on reverse eccentric double-thread grooves: a single screw is provided with a helical main flight, and an auxiliary flight is added in the helical interval of the main flight, and the diameter of the auxiliary flight is smaller than that of the main flight diameter; viewed from the top of the single screw, forming the first thread groove between the main flight and the auxiliary flight, and the second flight groove between the auxiliary flight and the main flight; relative to the rotation axis of the single screw, The eccentricity of the first thread groove and the second thread groove is the same but the eccentric direction is opposite; the eccentricity is greater than 0 and smaller than the difference between the radius of the first thread groove and the second thread groove and the radius of the barrel.
优选地偏心量小于第一螺纹槽和第二螺纹槽的半径与料筒半径之差，大于第一螺纹槽和第二螺纹槽的半径与料筒半径之差的五分之一。Preferably, the eccentricity is smaller than the difference between the radius of the first thread groove and the second thread groove and the radius of the barrel, and greater than one-fifth of the difference between the radius of the first thread groove and the second thread groove and the radius of the barrel.
本发明单螺杆螺纹槽中增设低于主螺棱的副螺棱，将螺纹槽分成反向偏心间隔分布的双螺纹槽，相邻螺纹槽相对于旋转轴线呈相对偏心分布，偏心量相同而偏心方向相反，且偏心量e大于0小于螺纹槽半径与料筒半径之差。单螺杆旋转时，双螺纹槽与料筒之间的容积以180度的相位差周期性从大变小再由小变大。纳入双螺纹槽的物料不仅受料筒与单螺杆的摩擦拖曳输送，同时随螺纹槽与料筒间容积变化受拉伸力场塑化挤压，物料在塑化运输中拉伸形变作用得以强化。In the single-screw thread groove of the present invention, an auxiliary flight lower than the main flight is added, and the thread groove is divided into double thread grooves distributed in reverse eccentric intervals. The direction is opposite, and the eccentricity e is greater than 0 and less than the difference between the radius of the thread groove and the radius of the barrel. When the single screw rotates, the volume between the double thread groove and the barrel periodically changes from large to small and then from small to large with a phase difference of 180 degrees. The material incorporated into the double thread groove is not only dragged and transported by the friction between the barrel and the single screw, but also plasticized and extruded by the tensile force field with the volume change between the thread groove and the barrel, and the tensile deformation of the material is strengthened during the plasticizing transportation. .
相对于现有技术，本发明具有如下优点：Compared with the prior art, the present invention has the following advantages:
1、与传统螺杆塑化输运输送设备相比，塑化输运过程的热机械力场变短，塑化输运能耗降低，混合效果好。1. Compared with traditional screw plasticizing transportation equipment, the thermomechanical force field in the plasticizing transportation process is shortened, the energy consumption of plasticizing transportation is reduced, and the mixing effect is good.
2、与叶片塑化输运设备相比，本发明基于反向偏心双螺纹槽的拉伸形变作用强化螺杆装拆方便。2. Compared with the blade plasticizing and transporting equipment, the present invention is based on the tensile deformation effect of the reverse eccentric double-threaded grooves to enhance the convenience of assembly and disassembly of the screw.
附图说明Description of drawings
图1为一种基于反向偏心螺纹槽的拉伸形变作用强化螺杆的结构示意图；Fig. 1 is a structural schematic diagram of a strengthening screw rod based on a tensile deformation effect of a reverse eccentric thread groove;
图2为基于反向偏心双螺纹槽的拉伸形变作用强化螺杆应用于挤出装置的结构示意图；Fig. 2 is a schematic diagram of the structure of the reinforced screw applied to the extrusion device based on the tensile deformation effect of the reverse eccentric double thread groove;
图3为基于反向偏心双螺纹槽的拉伸形变作用强化螺杆应用于注塑装置的结构示意图。Fig. 3 is a structural schematic diagram of the application of the tensile deformation strengthening screw based on the reverse eccentric double thread groove to the injection molding device.
具体实施方式detailed description
下面结合附图和实施例对本发明进行进一步的说明，但本发明要求保护的范围并不局限于实施例表述的范围。The present invention will be further described below in conjunction with the accompanying drawings and examples, but the protection scope of the present invention is not limited to the range expressed in the examples.
如图1所示，一种基于反向偏心双螺纹槽的拉伸形变作用强化螺杆，包括单螺杆8，单螺杆8上设有螺旋的主螺棱1，主螺棱1的螺旋间隔中增设有副螺棱2，副螺棱2的直径小于主螺棱1的直径；从单螺杆8的顶端看，形成主螺棱1与副螺棱2之间的第一螺纹槽3，以及副螺棱2与主螺棱1之间的第二螺纹槽4；相对于单螺杆8的旋转轴线5，第一螺纹槽3和第二螺纹槽4反向偏心，偏心量相同而偏心方向相反；即第一螺纹槽3和第二螺纹槽4的轴线6位于单螺杆8的旋转轴线5的上下两端，且偏心量e相同，偏心量e大于0小于第一螺纹槽3和第二螺纹槽4的半径与料筒9半径之差；偏心量e小于第一螺纹槽3和第二螺纹槽4的半径与料筒9半径之差，大于第一螺纹槽3和第二螺纹槽4的半径与料筒9半径之差的五分之一；单螺杆8旋转时，第一螺纹槽3和第二螺纹槽4形成的双螺纹槽与料筒9之间的容积以180度的相位差周期性从大变小再由小变大。As shown in Figure 1, a tensile deformation strengthening screw based on reverse eccentric double-thread grooves includes a single screw 8, and the single screw 8 is provided with a helical main flight 1, and the helical interval of the main flight 1 is additionally set There is an auxiliary flight 2, the diameter of which is smaller than the diameter of the main flight 1; viewed from the top of the single screw 8, the first thread groove 3 between the main flight 1 and the auxiliary flight 2 is formed, and the auxiliary flight The second thread groove 4 between the edge 2 and the main screw edge 1; relative to the rotation axis 5 of the single screw 8, the first thread groove 3 and the second thread groove 4 are reversely eccentric, the eccentricity is the same and the eccentric direction is opposite; that is The axis 6 of the first thread groove 3 and the second thread groove 4 are located at the upper and lower ends of the rotation axis 5 of the single screw 8, and the eccentricity e is the same, and the eccentricity e is greater than 0 and smaller than the first thread groove 3 and the second thread groove 4 The difference between the radius of the cylinder and the radius of the barrel 9; the eccentricity e is less than the difference between the radius of the first thread groove 3 and the second thread groove 4 and the radius of the barrel 9, and is greater than the difference between the radius of the first thread groove 3 and the second thread groove 4 and One-fifth of the difference between the radius of the barrel 9; when the single screw 8 rotates, the volume between the double thread groove formed by the first thread groove 3 and the second thread groove 4 and the barrel 9 is periodic with a phase difference of 180 degrees From big to small and from small to big.
一种基于反向偏心双螺纹槽的拉伸形变作用强化方法：单螺杆8旋转时，充满反向偏心第一螺纹槽3和第二螺纹槽4的物料，随第一螺纹槽3和第二螺纹槽4与料筒9的间隙以180度相位差周期性由大变小再由小变大而向前输送，使物料在塑化输运过程中的拉伸形变作用被强化。A tensile deformation strengthening method based on reverse eccentric double thread grooves: when the single screw 8 rotates, it is filled with the material of the reverse eccentric first thread groove 3 and the second thread groove 4, along with the first thread groove 3 and the second thread groove The gap between the screw groove 4 and the barrel 9 is transported forward periodically from large to small and then from small to large with a phase difference of 180 degrees, so that the tensile deformation of the material in the process of plasticizing and transporting is strengthened.
实施例1Example 1
如图2所示，单螺杆挤出机包括单螺杆8、料筒9和料斗7。单螺杆8置于料筒9内，料斗7与料筒9通过螺钉连接。单螺杆8上设有螺旋的主螺棱1，主螺棱1的螺旋间隔中增设有副螺棱2，副螺棱2的直径小于主螺棱1的直径；从单螺杆8的顶端看，形成主螺棱1与副螺棱2之间的第一螺纹槽3，以及副螺棱2与主螺棱1之间的第二螺纹槽4；相对于单螺杆8的旋转轴线5，第一螺纹槽3和第二螺纹槽4反向偏心，偏心量相同而偏心方向相反；偏心量e大于0小于第一螺纹槽3和第二螺纹槽4的半径与料筒9半径之差；偏心量e小于第一螺纹槽3和第二螺纹槽4的半径与料筒9半径之差，大于第一螺纹槽3和第二螺纹槽4的半径与料筒9半径之差的五分之一；单螺杆8旋转时，第一螺纹槽3和第二螺纹槽4形成的双螺纹槽与料筒9之间的容积以180度的相位差周期性从大变小再由小变大。As shown in FIG. 2 , the single-screw extruder includes a single screw 8 , a barrel 9 and a hopper 7 . The single screw 8 is placed in the barrel 9, and the hopper 7 and the barrel 9 are connected by screws. The single screw rod 8 is provided with a helical main flight 1, and an auxiliary flight 2 is added in the helical interval of the main flight 1, and the diameter of the auxiliary flight 2 is smaller than the diameter of the main flight 1; viewed from the top of the single screw 8, Form the first thread groove 3 between the main flight 1 and the auxiliary flight 2, and the second thread groove 4 between the auxiliary flight 2 and the main flight 1; relative to the rotation axis 5 of the single screw 8, the first The thread groove 3 and the second thread groove 4 are reversely eccentric, the eccentricity is the same but the eccentric direction is opposite; the eccentricity e is greater than 0 and less than the difference between the radius of the first thread groove 3 and the second thread groove 4 and the radius of the barrel 9; the eccentricity e is less than the difference between the radius of the first thread groove 3 and the second thread groove 4 and the radius of the barrel 9, and greater than one-fifth of the difference between the radius of the first thread groove 3 and the second thread groove 4 and the radius of the barrel 9; When the single screw 8 rotates, the volume between the double thread groove formed by the first thread groove 3 and the second thread groove 4 and the barrel 9 periodically changes from large to small and then from small to large with a phase difference of 180 degrees.
单螺杆挤出机加工高分子材料时，高分子材料从料斗7进入料筒9内，并随着单螺杆8旋转，充满整个单螺杆8与料筒9的间隙，物料在主螺棱1和副螺棱2的推力及料筒9内表面摩擦力的作用下，强制向出口输送。单螺杆8转动时，位于第二螺纹槽4中的物料，随第二螺纹槽4与料筒9的间隙由大到小由小到大变化，物料受单螺杆8与料筒9拖曳剪切形变作用的同时，还受由空间变化引起的体积挤压拉伸形变作用；而位于第一螺纹槽3中的物料，同样随第一螺纹槽3与料筒9之间间隙的变化，使得物料所受拉伸形变作用得到强化。高分子物料在拉伸力场和剪切力场的综合作用下被研磨，压实，排气，并在料筒9外加热的辅助作用下塑化熔融，塑化完成后通过与料筒9联接的外接口模成型制品。When the single-screw extruder processes polymer materials, the polymer materials enter the barrel 9 from the hopper 7 and rotate with the single screw 8 to fill the entire gap between the single screw 8 and the barrel 9. Under the action of the thrust of the auxiliary screw flight 2 and the friction force of the inner surface of the barrel 9, it is forced to be transported to the outlet. When the single screw 8 rotates, the material located in the second thread groove 4 changes from large to small with the gap between the second thread groove 4 and the barrel 9, and the material is dragged and sheared by the single screw 8 and the barrel 9 At the same time as the deformation effect, it is also affected by the volume extrusion and stretching deformation caused by the space change; and the material located in the first thread groove 3 also changes with the gap between the first thread groove 3 and the barrel 9, so that the material The effect of tensile deformation is strengthened. The polymer material is ground, compacted and exhausted under the comprehensive action of the tensile force field and the shear force field, and is plasticized and melted under the auxiliary action of the external heating of the barrel 9. After the plasticization is completed, it passes through the barrel 9 The connected outer interface is a molded article.
实施例2Example 2
如图3所示，注射装置主要由具有拉伸强化作用的单螺杆5、注射油缸4、注射料筒2、喷嘴1、料斗3，合模装置6等零部件组成。料斗3进料端面与料筒2固定连接，注射油缸4与注射单螺杆5紧固连接，单螺杆5置于料筒2内腔。单单螺杆5转动时，从料斗3进入料筒2的物料受料筒2外加热，同时随单螺杆5在剪切力场与强化拉伸力场共同作用下被塑化输送，塑化完成的熔体被储藏在注射料筒2头部的计量室内，同时单螺杆5在计量室内熔体的压力作用下往后退，当在注射料筒2中的储料量达到制品要求后，单螺杆5停止塑化，由注射油缸4释放注射压力推动单螺杆5向前，物料经喷嘴1进入合模装置6冷却成型制品，完成注射，同时进入下一个加工周期。As shown in Figure 3, the injection device is mainly composed of single screw 5 with tensile strengthening effect, injection cylinder 4, injection barrel 2, nozzle 1, hopper 3, mold clamping device 6 and other components. The feeding end surface of the hopper 3 is fixedly connected with the barrel 2, the injection cylinder 4 is tightly connected with the injection single screw 5, and the single screw 5 is placed in the inner cavity of the barrel 2. When the single screw 5 rotates, the material entering the barrel 2 from the hopper 3 is heated by the barrel 2, and at the same time, it is plasticized and transported by the single screw 5 under the combined action of the shear force field and the enhanced tensile force field, and the plasticization is completed. The melt is stored in the metering chamber at the head of the injection barrel 2, and at the same time, the single screw 5 moves backward under the pressure of the melt in the metering chamber. Stop plasticizing, the injection cylinder 4 releases the injection pressure to push the single screw 5 forward, the material enters the mold clamping device 6 through the nozzle 1 to cool the molded product, completes the injection, and enters the next processing cycle at the same time.
高分子材料单螺杆塑化运输拉伸形变作用强化设备应用于该注射装置也是对单螺杆5进行改进，单螺杆5上设有螺旋的主螺棱，主螺棱的螺旋间隔中增设有副螺棱，副螺棱的直径小于主螺棱的直径；从单螺杆5的顶端看，形成主螺棱与副螺棱之间的第一螺纹槽，以及副螺棱与主螺棱之间的第二螺纹槽；相对于单螺杆5的旋转轴线，第一螺纹槽和第二螺纹槽反向偏心，偏心量相同而偏心方向相反；即第一螺纹槽和第二螺纹槽的轴线位于单螺杆的旋转轴线的上下两端，且偏心量相同，偏心量大于0小于第一螺纹槽和第二螺纹槽的半径与料筒半径之差；偏心量e小于第一螺纹槽和第二螺纹槽的半径与料筒半径之差，大于第一螺纹槽和第二螺纹槽的半径与料筒半径之差的五分之一；单螺杆5旋转时，第一螺纹槽和第二螺纹槽形成的双螺纹槽与料筒2之间的容积以180度的相位差周期性从大变小再由小变大。The application of polymer material single-screw plasticizing transportation tensile deformation strengthening equipment to this injection device is also an improvement on the single screw 5. The single screw 5 is equipped with a main flight of the helix, and an auxiliary screw is added in the helical interval of the main flight. The diameter of the secondary flight is smaller than that of the main flight; viewed from the top of the single screw 5, the first thread groove between the main flight and the secondary flight is formed, and the first thread groove between the secondary flight and the main flight is formed. Two thread grooves; relative to the rotation axis of the single screw rod 5, the first thread groove and the second thread groove are reversely eccentric, the eccentricity is the same and the eccentric direction is opposite; that is, the axes of the first thread groove and the second thread groove are located at the center of the single screw. The upper and lower ends of the rotation axis, and the eccentricity is the same, the eccentricity is greater than 0 and less than the difference between the radius of the first thread groove and the second thread groove and the radius of the barrel; the eccentricity e is smaller than the radius of the first thread groove and the second thread groove The difference with the radius of the barrel is greater than one-fifth of the difference between the radius of the first thread groove and the second thread groove and the radius of the barrel; when the single screw 5 rotates, the double threads formed by the first thread groove and the second thread groove The volume between the tank and the barrel 2 periodically changes from large to small and then from small to large with a phase difference of 180 degrees.
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