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1、5,573,660 1 SCREW CONVEYOR BACKGROUND OF THE INVENTION 螺旋輸送機 ????????? ?本發(fā)明的背景 The present invention relates to a screw conveyor for transporting solid materials and including a feed screw formed, at least partially, as a sha

2、nk less screw of a plurality of substantially band-shaped screw threads extending along an imaginary helical line, a jacket surrounding the feed screw, and a brush cooperating with the inner surface of the jacket. 本發(fā)明涉及一個用于輸送固體材料，并包括進給螺桿形成的螺旋輸送器，至少部分地，作為一個有著多條帶狀延伸螺紋沿的假想螺旋線的shankless螺絲，夾套環(huán)繞在進給絲杠周圍，

3、且一個刷子與外殼的內(nèi)表面相配合。 Screw conveyors of the above mentioned type are well known. These conveyors serve for transporting or conveying of dry, wet, moisturized, pasteurized, sticking, dusty, and/or coarse solid materials. The Jacket envelops the feed screw to a greater or lesser degree. It is also poss

4、ible to completely surround the feed screw to avoid problems associated with transportation of dusty, spreading and odorous materials.The screw and the jacket can be formed of metal, but also of plastic materials. The length of such screw conveyors can reach 40m, with the diameter being in a range o

5、f 20-2000mm. The central axis of the feed screw can be inclined to a horizontal at an angle of from 00 to 350. It has been established in many cases that the amount of the transported solid material very much depends on the inclination angle of the feed screw. In particularly, at an inclination angl

6、e of more than 350, the materials fall through the free space of the shankless screw, and the delivery output of a screw conveyor can be reduced to zero. 上述類型的螺旋輸送機是眾所周知的。這些輸送機用于運輸或輸送干的，濕的，滋潤的，巴氏殺菌，粘的，粉末狀的，和/或粗糙的固體材料。外套在較大或較小的程度上包裹著進給絲杠。它也能夠完全環(huán)繞進給螺桿，以避免變?yōu)榉勰?，傳播擴散以及惡臭物質(zhì)的運輸?shù)膯栴}。螺釘和護套可以由金屬形成，但也可能由塑料材料制

7、成。這樣的螺旋輸送機的長度達到40米，直徑在20-2000毫米范圍內(nèi)。進給螺桿的中心軸線從00傾斜到350的角度傾向于一個水平面。它已經(jīng)在許多情況下成立，所傳送的固體材料量的多少非常依賴于進給螺桿的傾斜角度。尤其是，當傾斜角超過350度時，材料通過shankless螺絲的自由空間，一個螺旋輸送器的交付輸出可能減少到零。 International application WO/90/5100 discloses a screw conveyor having a shankless screw formed of at least two substantially band-shape

8、d screw threads extending along an imaginary helical line. 國際申請WO/90/5100透露一個螺旋輸送器由具有至少兩個沿假想螺旋線的帶狀延伸的螺紋的shankless螺桿形成的。 A particular type of a screw conveyor is designed for discharging solid materials contained in a solid-liquid mixture, which flows through a trough. Here the trough is, a transport

9、ing section for transporting solid-liquid mixtures. 一種特殊類型的螺旋輸送器被設計用于排出包含在固 - 液混合物的固體材料，它流過一個槽。槽在這里，是一個用于輸送固液混合物的輸送部。The known trough can be manufactured from, e.g., cement, steel, stainless steel, aluminum, plastics and other suitable materials. 該已知的槽可以以例如，水泥，鋼，不銹鋼，鋁，塑料和其它合適的材料制造。 In addition, the

10、screw conveyor can be mounted on a container for a solid-liquid mixture. 此外，螺旋輸送器可被安裝在一個盛有固 - 液混合物容器上。The container maybe a receiving tank, an intermediate container, a storage container and the like formed of a suitable mate- rial. 容器可能是一個接收槽，一個中間容器，一存儲容器以及一個合適的材料形成的容器等等。The jacket or sheath of a

11、 such screw conveyor is designed so that it can be penetrated by the flowing fluid and is formed as a sieve jacket extending into the trough at an angle.這樣一個螺旋輸送器的外套或護套的設計，以便它 可以由流動的流體滲透，并形成為以一定角度的槽延伸到的篩套。 The screw conveyor of this type comprises a closed tube in which the solid material is comp

12、ressed, rinsed, if needed, and finally discharged into a collecting tank. For improving the flow characteristics of the feed screws, they, at least, in the region of the trough, are formed as a shankless screw, that is the central region of the screw is empty. This leads to that, at an inclination a

13、ngle of the sieve jacket or the feed screw of more than 350, the transported solid materials falls through the screw empty or free region and are not dis-charged. This leads to that, at different delivery heights, feed screws should have different length, and that substantially increases manufactur

14、ing costs. 這種類型的螺旋輸送器包括一個封閉的管，在其中固體材料被壓縮，漂洗，如果有必要的話，最終還會被排入收集箱。為了提高進給螺桿的流動特性，它們至少在槽的區(qū)域內(nèi)，形成一個shankless螺桿，螺桿的中央?yún)^(qū)域是空的。這將導致，在篩夾克或進給絲桿的傾斜角超過350度時，運輸?shù)墓腆w材料下降穿過螺桿中空的或免費的地區(qū)，并且不顯示費用。這導致，在不同的交付高度，進給螺桿本應具有不同的長度，并且這從根本上增加了制造成本。 Accordingly, an object of the invention is a screw conveyor devoid of the above-

15、mentioned drawback and, in particular, a conveyor which can be used at a more steep installation angle than the conventional screw conveyors. 因此，本發(fā)明的目的是設計一個沒有上述的缺點的螺旋輸送器的輸送機，特別是，一個螺旋輸送器的輸送機，可用于比傳統(tǒng)的螺旋輸送機更陡的安裝角度。 SUMMARY OF THE INVENTION This and other objects of the invention, which w

16、ill become apparent hereinafter, are achieved by arranging the screw threads, when viewed in the transporting direction so that the front screw thread is spaced from the screw central axis a distance smaller than that of a screw thread located behind, with the brush being arranged on the step forme

17、d by two outmost screw threads. 實現(xiàn)本發(fā)明這個和其它目的，下文將變得顯而易見，通過布置螺紋，在傳送方向上觀察時，使前端的螺紋是從螺桿的中心軸的距離小于位于后面的一個螺紋隔開，刷子安放在兩個最外層的螺紋形成的階上。 Separate screw threads form with the screw central or rotational axis an angle of about 900. The screw threads are arranged so that each pair of adjacent screw threads forms a s

18、tep therebetween, with the screw threads being axially downwardly displaced relative to each other. Thus, the steps, when viewed from the central axis, are arranged one beneath the other toward the sieve jacket. This prevent the material, which is transported by the screw, from falling through the f

19、ree space of the shankless screw. By arranging the brush on the step formed by outmost screw threads, it is advantageously achieve that the brush, which has likewise a helical shape, is quasi setback, so that the screw thread closest to the sieve jacket extends, along some portions thereof, adjacent

20、 to the brush. This arrangement insures that the friction resistance of the helical brush,which slows the transportation of the material, is significantly reduced, whereby the sliding of the transported material along screw flanks is substantially facilitated. 獨立的螺紋形成與螺桿中心軸或旋轉軸的角度為約900。螺紋被布置成使得每一對

21、相鄰的螺紋形成其間的階，使螺紋軸向下,相對于彼此移位。因此，這些梯級，從中心軸觀察時，被布置成上下堆積朝向篩外套。這防止由螺絲輸送的材料，通過自由空間的shankless螺桿掉落。在工序形成的最外層的螺紋上安裝刷子，它有利于實現(xiàn)具有同樣的螺旋形狀刷子，是準挫折，使最近的篩夾克的螺紋沿相鄰刷子的某些部分延伸。這樣的安排保證，這會降低該材料的運輸，螺旋刷的摩擦阻力顯著降低，從而使沿螺桿側翼的輸送物料基本上是很便利的。 Advantageously, according to the invention, the front,when viewed in the transportation

22、direction, surface of the brush is aligned with a substantially radially extending, with respect to the screw axis, surface of the screw thread adjacent to the outmost screw thread.根據(jù)本發(fā)明，有利的是，在輸送方向前方觀察時，最外層螺紋邊上的螺紋表面,相對于螺桿軸，表面的刷對齊基本上沿徑向延伸的，。 Thereby it is achieved that the brush and the screw thread

23、adjacent to the outmost screw thread form a continuous smooth surface so that the transported material which slides outwardly under the action of tangential forces and gravity, encounter a minimal resistance. 由此來實現(xiàn)，在電刷和相鄰最外層的螺紋的螺紋形成一個連續(xù)的光滑的表面，從而使所輸送的材料，在切向力和重力的作用下向外滑動，會遇到一個最小的阻力。Transporting charact

24、eristics are substantially improved when the transported material slides smoothly along the brush helices. In the screw conveyor, the friction resistance of the jacket, which surrounds the screw, acts as a resistance force. By forming a smooth transporting surface, it is achieved, that the friction

25、resistance along the inner surface of the jacket is greater than the friction resistance of the transporting surface of the screw. This prevents the transported material from being retained on the screw, without being transported along the jacket in the transportation direction. 當物料靈活的沿著刷螺旋滑下時，傳輸特

26、性從根本上得到改善。在螺旋輸送器中,環(huán)繞在螺絲周圍外殼上的摩擦阻力，作為一個電阻力起作用。通過形成一種光滑的傳送面，它被實現(xiàn)，沿其外套的內(nèi)表面的摩擦阻力大于螺桿的輸送表面的摩擦阻力。這保證輸送材料沒有沿外套輸送的情況下不被保留在螺絲上。 It is further advantageously provided according to the invention, that the width of an innermost screw thread is very small in comparison with a length or height thereof measured

27、 in the screw axial direction. Thereby, the screw weight is reduced, without a need to eliminate a step between the inner-most and the next adjacent screw threads.Again, by forming a relatively long first step, the transport-ing characteristics of the feed screw are improved. Because of its small wi

28、dth, the innermost screw thread does not contribute in any substantial way to the transportation of the material by the screw. This further insures that the solid material, which is transported by the screw, would not fall into the free space provided between the screw threads. 根據(jù)本發(fā)明,進一步有利地證明最內(nèi)螺紋的

29、寬度，與它們在螺桿的軸向方向測量的長度或高度比較下來是非常小的。由此，螺桿的重量減少，而不需要消除最內(nèi)和下一個相鄰的螺紋之間的一個梯級.因此，通過形成一個相對長的第1梯級，進給螺桿的傳輸特性的改善。 由于其寬度小，最里面的螺紋對螺絲材料的運輸沒有任何實質(zhì)性的貢獻。這進一步確保了由螺桿輸送的固體材料，將不會下降到螺紋之間的空處。 It is further advantageously provided that the end face of each screw thread, located further away from the screw central axis, form

30、s a step which, advantageously extends substantially perpendicular to the upper surface of the screw threads and downwardly therefrom. This form of the screw prevents the material, which is transported by the screw, from being pressed against the jacket, which would have led to increased friction fo

31、rces and, on occasion, to a stoppage of the conveyor due to jamming of the material between the screw and the jacket. 進一步有利地證明，位于遠離螺桿中心軸線的每個螺紋的端面，形成了一個梯級，其中，有利的大致垂直延伸到螺紋的上表面，并從其向下。這種形式的螺桿防止由螺桿輸送的材料，被壓進外殼，這將導致摩擦力增加，并且，偶爾，由于螺釘和護套間材料的 干擾導致輸送機的停止 It is further advantageously provided according to t

32、he invention, that the jacket comprises a sieve surface and is used, in this case, for discharging of the solid material contained in a solid-liquid mixture which flows though a trough or stored in a container. 根據(jù)本發(fā)明進一步有利地證明，該外套包括一個篩面，在這種情況下，它將被用于排出固體物質(zhì)，這種物質(zhì)包含在流入一個槽或存儲在一個容器內(nèi)的一個固液混合物中。 The improvem

33、ents according to the present invention permit to mount the conveyor so that the feed screw extends to a horizontal at an angle of more than 350. 根據(jù)裝載輸送機發(fā)明許可證的改善措施，使進給螺桿延伸的水平的角度超過350。 BRIEF DESCRIPTION OF THE DRAWINGS 簡明附圖說明 The objects and features of the present invention will become more

34、apparent, and the invention itself will be best understood from the following detailed description of the preferred embodiment when read with reference to the accompanying drawings, wherein: 本發(fā)明的目的和特征將變得更加顯而易見，并且從下面的詳細描述的優(yōu)選實施例參照附圖來看，本發(fā)明本身將得到最好的理解，其特征在于： FIG. 1 is a schematic side view of a screw

35、 conveyor inserted into a trough; 圖。圖1是插入槽的一個螺旋輸送器的示意性側視圖; FIG. 2 is a side view of a screw used in a screw conveyor of FIG. 1; 圖。圖2是一個用在圖1中螺旋輸送器的一個螺釘?shù)膫纫晥D。 1; FIG. 3 is a cross-sectional view of the screw used in a screw conveyor of FIG. 1; FIG. 4 is a cross-sectional view of another embodi

36、ment of a screw used in a screw conveyor of FIG. 1; FIG. 5 is a cross-sectional view of yet another embodiment of a screw used in a screw conveyor of FIG. 1; FIG. 6 is a cross-sectional view of a further embodiment of a screw used in a screw conveyor of FIG. 1; FIG. 7 is a cross-sectional v

37、iew of a still further embodiment of a screw used in a screw conveyor of FIG. 1; and FIG. 8 is a schematic cross-sectional view of a preferred embodiment of a screw used in a screw conveyor of FIG. 1. 圖。圖3是圖中使用的一個螺旋輸送器的螺桿的剖視圖。 1; ??圖。圖4是圖中所使用的一個螺旋輸送器的螺釘?shù)牧硪粋€實施例的剖視圖。 1; ??圖。圖5是圖中使用的一個螺旋輸送器的螺桿的又

38、一實施例的橫剖視圖。 1; ??圖。圖6是圖中所使用的一個螺旋輸送器的螺釘?shù)牧硪粋€實施例的橫剖視圖。 1; ??圖。圖7是圖中使用的一個螺旋輸送器的螺桿的再一個實施例的橫剖視圖。 1; ???圖。圖8是圖中所使用的一個螺旋輸送器的螺釘?shù)囊粋€優(yōu)選實施例的示意性剖視圖。 1。 DETAILED DESCRiY110N OF THE PREFERRED EMBODIMENTS 具體DESCRiY110N優(yōu)選實例 A screw conveyor according to the present invention can generally be used for transport

39、ing solid material. If the feed screw surrounding sheath is formed, at a least along portion thereof, as a perforated basket, the screw conveyor can be used as a sieve conveyor for carrying away solid material from a solid-liquid mixture filling a trough or a container. Further explanations are made

40、 with reference to a particular embodiment of a screw conveyor mounted on a trough. However, this does not mean that the invention is limited to this particular embodiment of a screw conveyor. 根據(jù)本發(fā)明的螺旋輸送器，一般可以用于輸送固體材料。如果進給螺桿周圍的鞘形成，在至少其沿部分，作為一個帶孔的筐中，螺旋輸送器可以被用來作為一個篩傳送帶從填充槽或容器中的固 - 液混合帶走固體材料。進一步的解釋是參照一

41、個安裝在一個槽上的螺旋輸送器特定的實施例。然而，這并不意味著，本發(fā)明僅限于這種特定的螺旋輸送器實施例。 The screw conveyor 1, shown in FIG. 1, has a feed screw extending into the trough 3 and surrounded about the region thereof, projecting into the trough 3, with a sieve jacket 5.The sieve jacket 5 is cylindrical and is provided, as shown, with a

42、plurality of openings. 螺旋輸送器1，示于圖 1，有著進給絲桿，它攜帶著篩子外套5延伸到槽3和有關它們的區(qū)域周圍，伸入到槽3。篩套5是圓筒狀并提供了如圖所示的多個開口部。The number and cross-section of the openings are selected dependent on the application and operational conditions of the screw conveyor 1. Usually,the openings are circular. However, according to a design

43、ated application, elongate openings or so-called bar sieve plates can be used.所述開口的數(shù)量和橫截面的選擇取決于螺旋輸送器1上的應用程序和操作條件。一般，所述開口是圓形的。然而，根據(jù)一個指定的應用程序，細長開口或所謂的酒吧篩板可以使用。However, the cross-section of the openings does not form part of the present invention, and would not be further discussed. As shown in FIG. 1,

44、 the sieve jacket 5 has a plurality of substantially symmetrically arranged round openings. 但是，開口部的橫截面不構成本發(fā)明的一部分，并且將不再進一步討論。如圖中所示。如圖1所示，篩夾克5具有多個大致對稱地配置的圓形開口。 The sieve jacket 5 can be formed of a substantially cylindrical sheet metal portion or a sieve plate,which is not completely closed but rather

45、 is open, facing in a direction opposite to the direction of a stream flowing through the trough 3, as indicated by an arrow.篩套5可以由大致圓筒狀的金屬板部或篩板形成，篩板是不完全封閉的，而是開放的，所面對的方向是流經(jīng)槽3的水流的相反的方向，如所指示的箭頭。Through the opening in the sieve jacket, the solid-liquid mixture, which flows through the trough 3, can ent

46、er the sieve jacket, with the liquid flowing through the openings in the sieve jacket 65 and the solids being retained there.流經(jīng)槽3的固 - 液混合物，與通過篩夾套65的流動的液體和被保持在那里的固體，可以通過在篩套的開口，進入篩外殼。 The retained solids are carried away from the region of the sieve jacket 5 by a feed screw (not shown in FIG. 1) throu

47、gh a conical tube section into a cylindrical tubular regions. 被保留的固體由（圖1中未示出）一個錐形管部分進入圓筒形的管狀區(qū)域的進給螺桿帶離篩套5的區(qū)域。Therefrom, the solids are carried through a pressure section 10 to an ejector 11 ，which discharges the solids into a container 13. The container 13 is 5 provided outside of the trough 3. The

48、solids, which are carried away from the trough 3 are compressed in the pressure section 10. The squeezed out water is returned to the trough 3 through a drain pipe 15. The screw conveyor is supported in a suitable manner with a mounting la secured outside of the trough 3.從其，固體通過一個壓力部分10進行的噴射器11到一個容器

49、13的固體。該容器13是5以外的槽3提供。在壓力部分10被壓縮的固體物，從槽3的被帶走。擠壓出來的水通過排水配管15返回到輸送槽3。螺旋輸送器以合適的方式與一個安裝拉擔保的槽3外側的支持。 The rotational or central axis 19 of the screw conveyor is inclined with respect to the bottom 21 of the trough. It may be inclined, e.g., at an angle of 45%.螺旋輸送器的旋轉中心軸19的傾斜相對于在槽的底部21。它可能是傾斜的，例如，在4

50、5％的角度。The sieve jacket extends up to the bottom 21. In the region of the jacke 15 opening 23, which faces the stream of the solid-liquid mixture, there are provided guiding plates 25 which extend up to the side limiting walls of the trough 3 and serve to insure that all of the mixture flows through

51、the sieve jacket 20。 A suitable drive 27 is provided on the screw conveyor 1 and which drives, through a gear box 29, the feed screw of the screw conveyor 1.篩套向上延伸到底部21。JACKE15開口23，其面對的固 - 液混合物的流在該區(qū)域中，設置有導向板25，它向上延伸的側限制槽3的壁和服務以確保所有的混合物流經(jīng)篩套20。一個合適的驅(qū)動器27被設置在螺桿式輸送機1和其驅(qū)動，通過一齒輪箱29，螺旋輸送器中的進給螺桿。 FIG. 2

52、 shows a section of the feed screw, which extend inside of the conveyor 1 and, in particular, the section that extends inside of the sieve jacket 5 (FIG. 1). This feed screw section is formed as a screw 31. The screw 31 of the section located in the region of the sieve jacket 5, is formed as a shank

53、less screw.圖2示出了部分的進給螺桿，傳送帶1的內(nèi)部延伸，并且，特別是，篩套5的內(nèi)側延伸的部分（圖1）。此進給螺桿部作為一個螺釘31被形成。位于篩套5區(qū)域內(nèi)的螺桿31，作為shankless螺桿形成。The outer diameter of the screw 31 is so selected that it contacts the inner surface of the sieve jacket 5. The screw 31 have at least two, in the discussed example, four screw threads 33, 35, 37

54、 and 39 each formed as a band. As can be seen in FIG. 2, which shows cross-sections of the upper and lower regions of the screw 31, with the cross- sectional plane passing through the rotational or central axis of the screw conveyor 1, the cross-section of each separate screw thread is substantial

55、ly rectangular. The screw threads 33, 35, 37 and 39 partially overlap each other and form together a stepped surface. The screw threads 33, 35, 37 and 39 are so arranged that each large surface, visible in the cross-section, form with the central axis 19 a substantially rectangular angle. 螺桿31的外直徑是

56、這樣選擇，它接觸篩套5的內(nèi)表面。螺桿31有至少兩個，在所討論的例子中，四個螺紋33，35，37和39分別形成作為一個樂隊。正如在圖中可以看出的。 2，它顯示的螺桿31中，在上部和下部區(qū)域的橫截面的平面穿過的螺桿式輸送機1的旋轉或中心軸的橫截面，每個單獨的螺紋的橫截面基本上是矩形的。螺紋33，35，37和39的各部分彼此重疊，并一起形成臺階表面。螺紋33，35，37和39這樣布置為使得橫截面的每一個大的表面可見，與中心軸19形成一個大致矩形的角度的形式。 The separate screw threads 33, 35, 37 and 39 are arranged along an i

57、maginary helical line 50 that the screw 31 forms the feed screw. The outer diameters of the separate screw threads 33, 35, 37 and 39 are not equal to each other. The screw thread 33 with the smallest outer diameter lies somewhat inward of the adjacent screw thread 35, so that the screw threads 33 an

58、d 35 partially overlap each other. The outer diameter of the screw thread 35 is somewhat larger than the inner diameter of the screw thread 37 so that these two screw threads likewise overlap each other. The outer diameter of the screw thread 37 is correspondingly larger than the inner diameter of t

59、he screw thread 39, and these two screw threads also overlap partially each other. Thus a stepped structure, mentioned above, is formed. 單獨的螺紋33，35，37和39沿假想螺旋線50被布置，螺桿31形成進給螺桿。單獨的螺紋33，35，37和39外直徑彼此不相等。最小外徑的螺紋33位于相鄰的螺紋35的內(nèi)側，從而使螺紋33和35的部分彼此重疊。螺紋35的外徑稍大于螺紋37，使得這兩個螺紋有同樣彼此重疊的內(nèi)徑。相應的螺紋37的外徑大于螺旋螺紋39的內(nèi)徑，這兩個螺

60、紋部分彼此重疊。因此，上面提到的，形成臺階結構。 The outer diameter of separate screw threads 33, 35, 37, 39 remains the same over the entire visible longitudinal extension of the spiral 31, visible in the direction of the central axis 19. 單獨的螺紋33，35，37，39的外徑保持不變，在整個可見光的螺旋31的縱向延伸，在中心軸19的方向可見。Thereby, upon rotation of th

61、e screw 31 about the central axis 15 a cylindrical envelope if formed for each of the screw threads 33, 375, 37 and 39, with the outer diameter of the outmost screw thread 39 being somewhat smaller than the inner diameter of the sieve jacket 5. 由此，圍繞中心軸線15的圓筒狀的包絡線的螺桿31旋轉時，如果形成的螺紋33，375，37和39，為每個與最外螺

62、紋39的外徑稍小于篩套5的內(nèi)徑。When the screw 31 is rotated by the motor 27, the material accumulated in the sieve jacket 5 will be solid transported in the direction indicated by the arrow (FIG. 2). The screw thread 33, which is the frontmost thread seen in the transporting direction, is thus spaced from the cent

63、ral axis a smaller distance then the screw thread 35 located rear of the screw thread 33. The same applies to the screw threads 35 and 37, as well as to screw threads 37 and 39.當螺釘31是由馬達27的旋轉，篩套5中累積的材料，將在由箭頭指示的方向上（圖2）輸送固體。螺紋33，這是在搬送方向看到的最前面的線程，因此，從中心軸的一個較小的距離，然后在位于螺紋33的后部的螺紋35隔開。這同樣適用于螺紋35和37，以及37和3

64、9螺紋。 Because of the substantially rectangular cross-section ofthe separate screw threads 33, 35, 37 and 39, the edges of the screw threads 33, 35, 37 and 39, remote from the axis 19, define steps 41, 43 and 45 having flanks extending perpen- dicular to the surfaces of the contiguous screw threads

65、. 由于基本上矩形橫截面的數(shù)值模擬單獨的螺紋33，35，37和39，螺紋33，35，37和39的邊緣遠離軸線19，定義的邊緣延伸的梯級41，43和45，其具有側翼垂直于表面的連續(xù)螺紋。 Because the outer diameter of each screw thread 33, 35, 37 and 39 is the same along its entire longitudinal extension, as seen along the axis 19, the steps 41, 43, 45 do not generate any outwardly directed,

66、 toward the sieve jacket 5, forces acting on the solid material transported by the screw 31.由于螺紋33，35，37和39沿其整個縱向延伸的外徑是相同的，沿軸線19，梯級41，43，45不產(chǎn)生任何可見向外指向的，朝向篩夾克5 ，產(chǎn)生向螺桿31輸送固體物質(zhì)的作用力。 However, the steps 41, 43 and 45 prevent the solid material from falling into the free middle space of the screw 31, which extends around the axis 19. First of all, the steps 41, 43, 45 prevent the slippage of the materials collected on the screw 31 into the free space of the screw 31. Thus, the inner surface of the si