【導(dǎo)讀】率，對于確保草產(chǎn)業(yè)豐收極為重要。切割器是各種牧草收割機械的重要工作部件，目前，各種牧草收割機械普遍采用的切割器有往復(fù)式和回轉(zhuǎn)式兩種。機屬無支承切割，不產(chǎn)生堵塞現(xiàn)象，更換刀片簡易。適應(yīng)于稠密、倒伏和纏連的牧草，工作平穩(wěn)，生產(chǎn)率高。設(shè)計的雙圓盤割草機有。機構(gòu)組成，設(shè)計簡單，結(jié)構(gòu)緊湊;提升拉桿，完成機具的水平升降;輪處在同一個平面內(nèi)，結(jié)構(gòu)更緊湊;面成一定角度，且脫落或飛出時不致傷人，安全可靠。本次設(shè)計主要完成了圓盤式割草機的總體方案的選型，切割器的總體設(shè)計，傳動系統(tǒng)的設(shè)計，主要零部件的設(shè)計與校核。

　　

【正文】 the billhook while the twine end is retained in a jaw of the billhook to plete the formation of a wine knot. In one embodiment, the wiper has slots formed therein and is adjustably mounted on the arm and relative to the billhook by screws inserted through the slots and the readably mounted in the arm. In a second embodiment, the wiper has first and second portions joined together at a right angle and are adjustably mounted relative to the arm and to the billhook of the knitter by the insertion and removal of shims 本科機械畢業(yè)設(shè)計論文 CAD 圖紙 401339828 32 between the second portion of the wiper and the arm. 2 Brief description of the drawings FIG. 1 is a fragmentary perspective view of a twine knitter in accordance with a preferred embodiment of this invention. FIG. 2 is an exploded view of a wiper arm of the knottier shown in FIG. 3 is a view of the knitter of taken along line 3— 3. FIG. 4 is a fragmentary perspective view of a knitter wiper arm in accordance with a second embodiment of this invention. FIG. 59 are fragmentary perspective views puff a knitter of showing progressive stages of knot tying. Description of the preferred embodiments — 3 show in fragmentary form a knitter 1 in accordance with the preferred embodiment of this invention. Knitters of this general type are well known in the art and are widely used mercially, such as in the John Deere 466 Series balers sole by John Deere Company, a corporation of Delaware. Such balers are used for the baling of hay or straw into a rectangular parallelepiped shaped bale. Knitter 1 prises a billhook 13 including (1) a center shaft 3on which billhook 13 is rotatable mounted in a knitter frame 5 and (2) a jaw 14 around which a loop of twine is formed as rotated and for retaining the twine end during knot formation. On one said of billhook 13 a twine disk 15 and a twine holder 16 are provided for holding a segment of twine 19. On the opposite side and below billhook 13, a wiper arm 17 is provided. Wiper arm 17 (, 2) includes a twine guiding fork 20 preferably of cast ironman knife blade 24 bolted to fork 20 cutting the twine and a wiper 21 for removing a loop of twine 19 from billhook 20 consists of a pair of fingers 22, 23 between which twine 19 is received and guided and a vertex 25 at which fingers 22, 23 are joined. One side of cortex 25 has a boss 25 with a pair of threaded apertures 29, 31 and the wiper 21 is adjustably mounted. Fork 20 may be formed either by casting or fing and therefore is a strong, rigid ponent. Wiper 21, preferably of case hardened steel, is plate like and has a pair of slots 33, 35 corresponding in spacing to the threaded apertures 29, 31 of boss 25. The profile of wiper 21 is conventional and has an actuate recess or ledge 37. Wiper 21 is detachably mounted to fork 20 by a pair of screws 39,41 which pass through slots 33,35 and thread ably engage apertures 29,31 so that fork 20 and wiper 21 are held tightly tighter. Wiper 21 is adjustable relative to fork 20 by moving wiper 21 back and forth in a plane parallel to the major planes of wiper 21 and in a direction parallel to the direction of elongation of slots 33, 35 when screws 39, 41 are loosened. Referring now to FIG. 3, wiper 21 is positioned closely to billhook 13 which ledge or recess 37 centered in relation to an outer surface or heel 43 of jaw 14. The maximum remended clearance between a first portion 43 of jaw 14 and ledge 37 is ... At the closest distance which jaw portion 45 approaches during rotation of billhook 13 during the formation of a twine knot? In contrast to the conventional integral wiper arm described in the Background of 本科機械畢業(yè)設(shè)計論文 CAD 圖紙 401339828 33 the Invention which requires modeling or bending of the wiper arm at positions corresponding to positions A,B and C shown in FIG. 2 in order to adjust the wiper with respect to the billhook for proper stripping of a twine loop from the billhook, the present embodiment of the invention achieves alignment simply and easily by adjustment of wiper 21 by loosening of screws 39,41 and sliding plate like wiper 21 back and forth. This permits fork 20 and wiper 21 to be deformable in use. In accordance with the features of a second embodiment of this invention, FIG. 4 shows a vertex 51 of a wiper arm 53 identical to wiper arm 17 except for the portion shown and described in FIG. 4. Shows a vertex 51 of a wiper arm 53 identical to wiper arm 17 except for the portion shown and described in FIG. 4. Wiper arm 53 portion shown and described in FIG. 4. Wper arm 53includes a wiper 55 having first and second portions 57, 59 joined together at a right 55 is adjustably mounted to a major surface 61 of vertex 51 by an attachment means 63,here shown as a pair of bolts(only one of which— bolt 65— is visible in )inserted through aperture 67, 69 in wiper 55 and vertex 51, respectively. Adjustment pof the height of a ledge 71 of wiper 55 above surface 61 is acplished by the insertion and removal of shim means 73 inserted on bolt 65 between surface 61 and second portion 59 of wiper 55. Shim means 73 is here shown as a plurality of washers. The functionng of knotter 1 for tying twine around a bale of hay is conventional and will be described herein only briefly. Particular reference is made to and — 9 which show the progressive stages of knot formation. shows the condition when a needle 75 (showm in ) is threaded with twine 10 stored in a twine box (not shown) and from a prior cycle, one end of twine 19 is held in twine disk 15 by twine holder 16. Twine 19 is threaded through fork 20 between fingers 22,23 and ocer the top of bale 77. As bale 77 is formed and moves against twine 19,twine 19 is extended across the outer surface of bale 77 by pulling more twine from the twine box. As shown in ,when bale 77 reaches a predetermined length, a