Cong nghipp rdng
^ THIET KE C A N G NGO AM LAP TREN MAY KEO DT75 DE VAN XUAT GO
Le Van Thai
PGS.TS. Truang Dai hpc Ldm nghiep
T O M T A T
V^n xuat go rimg tv nhien la c6ng viec rat n3ng nhoc vk ton nhieu cong siic nen can thiet Ip dyng ca gioi vao khau cong viec nky. Tren co so kfit qua khao sat thirc te san xuit khai thac riing ty nhien vk tham khao cac t^i li?u chuySn m6n lign quan, bii bfio trinh biy k£t qua l\ra chgn phirong kn thiSt ke c&ng ngogm go 15p tren miy keo DT75 de van xuat gfi theo phuong ph^p V.60 niia let cung nhu vi§c sii dung phan mem Autocad vk phuang phSp tfnh toSn ly thuyit da thiSt k£ duijrc cic bg ph?n chfnh ciia ngo^m van xuat g6, bao g6m: RSng ngoam, can treo ngogm, khung do, bu 16ng, chot lap rdp vk cac xilanh thuy lire dong mo ngoam va nang hg can treo ngoam.
Tfr khofi; Keo nun lit, Idwi tiidc gd, mdy Iceo DT75, ngogm kpp go, rung tp- nhiSn, v^n xuat go.
I. DAT VAN DE
Go rung l\r nhifin cd dac difim lfi kich thudc, lr(?ng lugfng rieng ldn nen cfic cdng viec trong khai thac gd rfit nang nhoc, tdn nhieu cdng sue dfic biet lfi khau van xufit gd.
Ci nudc ta, viec ca gidi hda khfiu van xuat go trudc day da nhap mot sd logi may mdc chuyen dilng tir nudc ngofii nhu TDT55A, TT4 cua Lidn Xd (cu), LKT80 cua Ti^p Khfic vfi VOLVO cua Thuy Didn... Qua thuc td sii dyng cho thfiy, cac thidt bi dd dfi khfing djnh khfi nfing lfim viec tin c|iy vfi cho nang suat cao. Nhung ddn nay do nhi^u ly do khfic nhau dan den sd lugng may mdc chuydn dung nhap ngoai hoat ddng phyc vu khai thfic rirng ty nhidn d cfic tinh mien Bac nudc ta cdn rfit It. Trong khi do, viec khai thac rirng ty nhidn phfit sinh nhung d|lc thh mdi nhu:
Quy md sfin xufit nhd, hidn tnidng khu khai thfic cfich xa khu dfin cu, dia hinh khd khan, g6 khai thfic phan tfin trgn mot di?n rong, sfin lu<?ng thfip, d^c bi^t lfi khai thfic chon nhfim sii dyng ben viing ngudn tfii nguyen rung nen khdng thd dfiu tu mua sfim cfic thiet bi chuyen dyng dfit tien phyc vy co gidi khfiu van xufit go nhu dfi timg lfim trudc day.
Dd nang cao hi?u qua sir dyng thidt bi theo hudng da chuc nfing vfi phfit huy toi da nfing lyc cua mfiy mdc sfin cd tai mot ca sd sfin xufit, vi?c nghidn cuu thiet ke cac bd phlin
chuyen diing Ifip vdi may keo de mgt m§t nd van thuc hi?n chuc nfing dac thii vfi ngoai ra cdn cd kha nfing ca gidi hda khfiu van xufit gd gdp phan cfii thien dieu kien lam viec cho cdng nhfin, tfing nfing sufit vfi gifim gia thanh sfin pham cung nhu giam thieu tfie ddng xau den mdi trudng lfi hdt siic cfin thiet vfi cd ^ nghTa thuc te cao.
IL PHUONG PHAP NGHIEN CUU 2.1. Phuvng ph^p ke thira tai li^u
Thu thgp, suu tfim cfic tfii lieu chuyen mdn lien quan de xay dung, lua chpn phuang an thiet ke hap ly.
2.2. Phirong phap nghiSn cihi ly thuyet Sir dung phan mem thiet ke co khf Autocad de vg vfi md phdng qufi trinh lfim vi?c cua lien hgp may, lfim ca sd cho viec xfic dinh cac thdng so phyc vu thidt ke. Van dyng if thuyet CO hgc, CO sd thiet ke mfiy de tinh tofin thidt ke cfic chi tiet chinh cua cfing ngoam Ifip tren mfiy kgo DT75 phyc vu van xuat gd.
IIL KET QUA VA T H A O LUAN 3.1. Xay dung phirong an thiet ke
Tim hieu mpt so kdt cfiu cua ngogm Ifip trdn mfiy keo trdn the gdi vfi trong nudc, tren ca sd dd da xay dung mgt sd phuang fin thiet ke. Sau khi phan tich vfi so sanh uu nhupc didm cua timg phuang fin de lua chgn ra phuang an hpp ly nhat (hinh 01). Cau tao ciia phuang an nay TAP CHI KHOA HQC VA C 6 N G NGHf LAM NGHIfP S 6 4-2014 101
mm^
Cong nghipp rirng _ ^ _ ^ = ^ nhu sau: Khung chinh gfi Ifip cfing ngoam (2)
dupc Ifip chat vdi mfiy keo ca sd bdi cfic buldng. Cfing ngoam (8) dupc Ifip tren dau cfin treo (5) vfi cfin treo dupc Ifip bfin Id trdn khung (11). V i ^ ddng md cac rfing ngogm vfi nfing hg
can treo ngogm nhd cac xilanh thiiy luc. Khung dd (11) dupc lien ket ehfit vdi khung chinh (2) bfing cfic buldng, nhd thd mfi ngoam van xuSt gd dupc treo sau mfiy keo (hinh 01).
Hinh 01. Sff^ cau tpo cua liin hpp tndy DT75 vdi cdng ngopm go J. mdy keo casa: 2. khung chinh: 3. hop gidm ldc; 4. dpng ca thuy luc;
5. cdn Ireo ngoam; 6. khdp noi; 7. Idnmg ngopm; 8. cang ngogm;
9. xilanh ndng hp cdn; 10. mid d& cap: 11. khung da cdn 3.2. Thiet ke, tinh toan ngostm v^n xudt gS
3.2.1. Lifa chpn kit cdu ngoam van xuat go Ngo^m van xufit gd Ifip trdn mfiy k^o cd nhi^m vy kep ch§l mpt dau cfiy gd (hoge bo g5) rdi nfing len d dp cao can thiet de vgn xuat theo phuang phfip kdo niia let. Sau khi da tim hieu cfic loai ngogm cung nhu phuang fin ddng md ngogm, tren ca sd so sfinh uu nhupc diem
cua timg logi, tac gifi chpn loai ngoam vdi hai xilanh thuy lire bo tri ddi xiing nam ngang de thidt kd (hinh 02). Ket cfiu cua ngoam van xuat go gdm cd cfic rang ngogm (3) Ifip ban le tr8n khung (1) bfing cfic chdt (4) (hinh 02). Vi?c dong md ngoam nhd hai xilanh thuy luc bd tri doi xumg (2). Ngogm van xufit dupc treo tren dfiu can (5) nhu d hinh 01.
102
Hinh 02. Ket cau ngopm gd thiet ki 1. Khung chinh; 2. Xilanh thdy luc;
3. Rang ngoam; 4,5. Choi
TAP CHi KHOA HQC VA C 6 N G NGHE L A M NGHIEP SO 4-2014
Cong nghipp rirng 3.2.2. Thiit ki rdng ngopm
a. Xdc dfnh tdi trpng tinh todn khi van xudt bdng cdng ngoam
Sii dyng cfing ngoam de nang dfiu gd len khdi mat dfit roi keo niia let, md hinh tinh toan tai trpng tinh toan khi vgn xuat gd (hinh 03).
Hinh 03 Trong dd:
a - gdc ddc mgi dudng van xuat;
y - gdc nghieng cua cay gd vdi mat dudng;
Q - trpng lupng ciia cfiy gd van xufit;
KQ - phan trupng lupng cay go dfit trdn cfing ngogm;
(l-k)Q - phfin trpng lupng cay go let trdn mat dat;
k : h§ sd phfin bd tfii trgng ldn mfiy;
Fms - l^c ma sfit gifta dfiu gd let vdi mat dat;
Fk- luc keo gd ciia mfiy keo nghidng mdt gdc p so mgt dudng xufit;
Pj - lyc qufin tinh ciia cfiy gd khi van xuat.
Tinh tofin cho trudng hpp nguy hiem nhat, may kdo van xufit go ngupe ddc vdi dg ddc dpc tdi da chpn a = 20", mpt dfiu bd gd ldt tren mat dfit, mpt dfiu dgt tren ngoam, tryc ddi xiing cda bd gd tao vdi mgt dudng mpt gdc ;'. Luc keo gd ciia cfing ngogm cd phuang Ifch so vdi phuang mfit dudng van xuat mdt gdc p, Irudng hop nguy hidm nh^t chgn p = 45".
Lgp phuang trinh cfin bfing cfic lyc tfie dyng ldn cfiy gd theo phuang OX, tii dd xay dyng dupc phuang trinh tuang quan giua tfii trpng tinh tofin vdi lyc kdo can thiet nhu sau:
i=;. COS/9 k.sina+{\-k).sma+(l~k\f.cosa
= 24915,25(N) (1) b. Xdc dfnh dp Itfc phdp tuyen giira rdng
ngoam vd go khi van xudt
Trong qufi tiinh lam vi?c, rang cang ngoam phfii tao ra fip luc du ldn dd gift dfiu cfiy gd van xuat de khdng bi tupt khdi ngogm. Mudn vgy thi luc ma sfit gifta cfic rfing ngoam vdi go phfii thang dupc tdng cfic lyc cfin sau:
- Luc cfin do do ddc ciia trgng lupng cac cfiy gd van xufit gfiy ra;
- Luc qufin tfnh ciia cfiy gd van xufit do chuyen dpng cd gia tdc;
- Luc ma sfit gifia cfiy go mat dudng vgn xufit.
Luc ma sfit dupc tao ra do fip l\rc gifia rang cfing ngogm vdi go (hinh 04). Vfin dd cfin giai quyet tiep theo la xac dmh fip lire can thiet dd gd khdng bi tupt khi vgn xufit?
Gpi ap lyc do cac rang ngoam lac dyng ldn cfiy gd tgi cfic diem A,B,C tuang ung lfi Ni,N2 vfi N3 va phan trpng lupng ciia cfiy gd dgt trdn cfing ngogm lfi k.Q, cfic lyc c6 phuang chidu nhu d hinh 04.
T4JP CHI KHOA HQC VA CONG NGHE LAM NGHIEP SO 4-2014 103
Cong nghiep ritiig
Lire ma sdt giua rang cang ngoam va g6 du(?c xdc dinh nhu sau:
F... = Y.''..='~N,+N,+N,)f, (2) O dSy: fl 1& he s6 ma sat giita g6 va cang
ngoam, fi= 0,2 - 0,45 \ky h = 0,45
Khi v|n xuat, dieu Ici?n d l cSy g6 Ichong bj tupt kh6i cang ngoam &:
F,„=>F^±Fi±P, ( 3 ) Trong d6: F„rf Id lyic ma sdt giiJa ddu cay g6 t^ ™:
let trSn mdt duong vd dugc xdc dinh:
F^=(\-k).Q.a3sa.f. (4) Trong d6:
lc: h? so phan bd tai trong Ign mdy, phdn g6c d|t len mdy k = 0,4 -=• 0,6 ldy k = 0,6;
Q: tai trpng chuySn(N),Q = 24915,25 (N);
f2: h | so ma sdt giua g6 va mat duong van xudt f; = 0,4-r 0,6, ebon Idy fj = 0 , 6 ;
PJ: l\rc qudn ti'nb cua cay go kbi van xudt, Z', = 0 (5) do toe do ciia may keo van xudt g6 nbo (khodng 5 km/b);
so phuong mdt duong vgn xudt mot g6cj', kk bop cac cflng thtic (4), (5) vd (6) ta c6:
F „ , . c o s ; ' > [ ( l - « : ) . e . / , ± e . s i n « ] (6) Tbay F „ tit cflng thiic (2) vdo cong thiic (6) ta dugc:
(Af, +/V, +A^,)./,.cos;'> [(l-k)Q.f^ +asin«] (7) Do k6t cdu ngoam dfli xiing (Ni = Na) nen
^ _ Q K I - 1 ) . / ; + s i n g + <:./,.cosy]
2(l + s i n p ) / i . c o s ) '
= 12120 (N) (8) c. Thiet ke rdng ngogm
Sg do phdn tfcb Iuc tdc dung tren rdng ngoam khi ldm viec (hinh 05), gflm c6:
- Luc tdc d\mg ciia xilanh thiiy luc dS diing mo ngoam (F^,);
- Phdn luc tai ehflt Oz (Fi);
- Ap luc ciia go len rdng ngoam (Ni).
Lap phuong trinb can bdng mfl men ciia cdc Fj: luc can do do dflc dpc cua trong lugng luc dfli diSm O2, tir do suy ra luc cdn thilt ciia
" ^°- ^ ' = ± e - ' i " « . <«> xilanh thliy luc dflng mo ngoam:
_ Luc ma sdt thdnh phan giOa cdng ngoam vgi
gfl se cfl pbuong theo true cdy gg nen nfl lech F„ = l^,.coS(f.753tN,.siiB(!25
200 = 26849 (N) (9)
104 TAP CHl KHOA HQC v A CONG NGHE LAM NGHIFIP SO 4-2014
Cong nghiip rirng
N l sJn3C
Hinh 05 Tir sa dd phfin tich luc (hinh 05) ta xfic dinh dupc tidt didn nguy hiem nhdt cua rang ngoam la tai tam ciia chdt O2.
Di?n tich tiet di?n nguy hidm dupc tinh theo cdng thuc (10):
^ma. = ^ ^ ^ ^ ± — ^ [ ( ^ I (10)
ma. ^ ^ I i V ;
Trong dd:
Mmax. Wu- md men udn vfi chdng udn tgi tiet di?n nguy hidm;
N- luc keo (nen) tgi tiet di?n nguy hiem;
F - di?n tich tiet didn nguy hidm;
[<j]„ - ung sufit udn cho phdp ciia thep 45.
Hinh 06. K& cau cdng ngopm 3.2.3. Thiet ki cdn ndng Chpn trudc be dfiy rfing ngoam tgi tiet di?n
nguy hiem, b = 70 mm. Thay cfic sd lieu tinh tofin dupc d trdn vao cdng thiic (ID) dupc kich thudc be r^ng ciia rang ngoam (a) tgi tiet di?n nguy hiem lfi:a> 177,94(mm). Cfin cii vfio kich thudc tiet dien nguy hidm, cfic kich thudc khfic ciia rang ngoam dupc xfic dinh theo nguydn tfie chdp hinh tu kich thudc cda rang ngogm trdn mfiy CAT4. Su dyng phan mem Autocad dd ve bien dgng ciia rang ngogm thiet kd (hinh 06).
TAP CHI KHOA HQC VA C 6 N G N G H | : LAM NGHIEP SO 4-2014 ngopm Sa dd phfin tich luc vfi bidu dd md men ciia cfic luc tfie dyng ldn can treo ngoam khi lfim vi|c (hinh 07), bao gom:
- Lyc kdo nua let go trdn mfit dudng van xufit: Fk=F„cos45''= 21000 N (11)
Vdi Fn lfi luc kdo tidp tuyen cua mfiy keo;
- Phan trpng lupng ciia bd gd dat ldn ngogm lfi: kQ= 0,6.24915,25 N
105
Cong nghipp rimg
- Lyc tfie dyng cua xi lanh thuy luc nang ha Chpn vat lidu lfim can la thdp CTS, cfin treo ngogm Fxi2. (7.2) [1], ta cd [al, = 58 (N/mm^)
1
F.sin45
F-"F,=C)s15
K6t cau vd kfch thuoc ciia cdn treo ngo^m dugc xdc dinh theo pbuong phdp sau: Can cii vdo so do phdn ti'ch cdc luc tdc dyng len cdn treo ngoam (hinb 07), dua vdo Hnh dang va kfch thudc tflng the cua cdng ngoam, ta chon kit cau cua can theo dang ddm bin diu vdi tilt dien Id Mnh bgp chtt nhdt rang co cdc kich thuoc nhu sau:
- Tai dau treo ngosim chpn:
a = 100 mm ; b = 150mm;
ai= 60 mm; b | = 110 mm.
- Tai try d& chpn:
a = 200 mm; b = 300 mm;
ai= I 6 0 m m ; b | =260 mm.
- Tai dilm ldp xilanh thuy lyc ndng ha cdn treo ngo^m chgn:
a = 150 mm; b = 200 mm;
ai= 110 mm; bi = 160 mm;
Sau kbi dd chpn xong kit cdu vd kfch thuoc ciia cdng treo ngoam, tiln hdnh kilm tra bin cho tilt difn nguy hilm tbeo cong tbiic:
Hinh 07 Trong do:
Mmax - mfl men u6n ldn nhdt tai tilt dijn nguy hilm:
M „ , = 38543,7.10'(Nmm) W„ - mfl men ehflng u6n tji tilt di$n nguy
hiem:
W. - ^ = 1 1 8 4 . 1 0 ' (13) 6 6
N- luc n6n tai tilt dien nguy hilm:
A' = F„.sin20°-A',.sin30° =7713(N) F - tiet dipn nguy hilm:
F = a.b-aib| = 18400 mm^
(14) (15) ltT\ - irng suat ufln cho phep,
[cr].= 50 (N/mm-)
Tbay cdc sd lipu tren vdo cflng thiie (12) ta _385437.1Ci' 7713
1184.16 18400"
W„ r ^ M . (12)
=3297<50(N/mni^) (16)
Tit (16) ta thdy tilt dipn lua cbpn nhu v|y Id thoa man dieu kien bin vdi hp sfl an todn Id: n
= 1,5165. Sau khi tfnh chpn dupc kfch thudc tai cdc tilt dien ciia cin, tiln bdnh xdy d\nlg ban v5 cbi tao cdn treo ngoam (hinh 08).
106 TAP CHI KHOA HQC v A CONG N G H ? LAM NGHIEP SO 4-2014
Cong nghipp rirng
B —
B - 1 - 1
5
\ —
\ «
^—•
K^
^ c —
,„
H
A ^ ( 1 : 10)
M
B-B (1:10) C-C ( 1 : 1 0 )
Hinh 08.
3.2.4. Thiet ki chot
Vfit li?u lfim chdt lfi thep 45; tra bfing (7.21) [5]tac6: [r], =120 N/mm^
Chieu dai chdt dupc chgn theo kich thudc cfing ngogm thiet kelfi:15 (cm). Dudng kinh ciia chdt dupc tinh theo dieu kien ben cfit:
- Tinh cho chot Oj (chot xi lanh vdi cdn ireo cdng ngoam)
A > F^
Chpn del = 35 mm (17) Trong dd: Fxi2 - luc ctia xi lanh tdc dung cdt ehflt, Fj2 = 58577 N
- TCnh cho chot O2 (chot cang ngogm)
= 29,28 mm.
J,, > A.N,
3,14.[T], = 24,57 mm.
Cdn treo ngopm
Chpn d t 2 = 3 0 m m (18) Trong dd: N2 - Tong hgp cac luc tdc dung cdt ehflt
- Tinh cho chot O3 (chot cdn vdi trif da)
2.0,1..?, 2 . . . &
4 Gifii phuang trinh (19) ta dupc:
rf^3 > 56 mm.
Chpn dc3=60mm 3.2.5. Thiit ki khung d&
Can cu ket cau cua may keo ca sd, kich thudc cua cfic bp phfin Ifip tren khung, tac gifi lua chgn vfit lieu chd tao khung dd lfi thep 45.
Sau khi tfnh tofin bdn da xay dyng bfin ve ehe tgo khung da (hinh 09).
T ; ^ CHI KHOA HQC VA C 6 N G NGHE L A M NGHIEP SO 4-2014 107
Cong nghifp rimg
•15
a ^
3.2.6.Thiel ke bu long
So dfl tfnh todn nhdm bu iflng ldp khung dg chfnh 16n may keo DT75 dugc the bipn nhu binb 10. Bdng phugng phdp phdn tfch, tflng hgp cac luc tdc d\mg len tung bu Iflng, sau do so sanh da lim dugc nbflm bulflng sd 2 vd 3 chju l\ic ldn nhdt: T2
= T3 = 81282 (N)
+ Tmh todn chpn logi buldng:
Tai vi tri so 2 bo tn 4 chiec bulflng do dd moi chiec buldng chiu mgt lye Id:
Tbi T\_ _ 81282 = 20320 (N) (20) 4 ~ 4
Chpn vat lipu chi tao buldng Id th6p CT3, [o-]k = 220N/mm^
Dudng kfnh buldng dugc xdc dinh tbeo siic ben k^o:
d > 4.7-„.l,3
:12,37 mm (21)
4cri
Vdy chpn buldng cd ky hieu M16 x2
mnh 10
108 T ^ CHI KHOA HQC VA CONG NGHfi LAM NGHIEP SO 4-2014
Cdng nghi^ rung 3.3. Ly^ chc^n xilanh thuy luc
3.3.1. Xi lanh thuy Iffc ddng m&ngoam - Xdc dinh hdnh trtnh ldm viec cua xi lanh dong ma ngopm
Cfin cu vfio tfii trpng chuyen ldn nhfit vfi nhd nhat va kich thudc go van xual de xfiy dung ket cau ciia ngoam dang lfim vide khi md ldn nhat vfi nhd nhat nhu hinh (11) Su dung phfin mem
AutoCAD ve vfi xac dinh dupc hanh trinh ifim vi?c cita xilanh la S| = 300 mm.
- Chpn xilanh
Can cii vfio gifi tri lyc cfin thiet cua xilanh thiiy lyc Fxi (9) vfi hfinh trinh lfim vide cua xilanh (Si), ta chpn xilanh thuy lyc ddng md ngogm la ^63^300 [14] vdi thdng sd ky thugt d bfing 01.
Hinh 11
Bfing 01. Cdc thong so cua xilanh thuy luc dong md ngopm Dirdng kinh 4>
(nun)
di^n tich (cm ) Ap suat (kg/cm ) 140
63 31,2 24,1 21,6 4343 3374
3.3.2. Xilanh thuy Ipec ndng hp cdn treo ngopm - Xdc dinh hdnh trinh ldm viec cua xilanh ndng hg cdn treo ngoam
Dd xfic djnh dupc hfinh trinh lfim vi$c cua xilanh nang hg ngoam, ta khao sfit can nang ngoam d hai vi tri: Vi tri thu nhat can treo ngoam cd the ha xudng thap dd ngoam khiic gd nfim sfiu each mat dfit mgt khofing ifi 600 mm;
Vi tri thii hai la khi can nang khiic gd len cao khi vgn suat (hinh 12). Sir dyng phfin mdm AutoCAD ta xfic dinh dupc hanh tiinh lfim vi?c cua xilanh thity lyc nang ha cfin treo ngoam lfi S2 = 450 mm.
- Xdc dfnh luc cdn thiet ndng ha cdn treo ngoam
Sa do phfin tich luc tfie dyng vfi bidu dd md men cua cfic lyc tfie dyng len cfin nhu (hinh 07).Viet phuang trinh cfin bfing md men cua cfic luc ddi vdi tam chdt gifia can treo ngogm va khung dd ta dupc:
^F..cos4^.130(^..a.l30Q^^^^^^ ^^^ ^^^^
' " cosl^.40{>fsinl5".150
Chpn hai xilanh nen lyc can thiet nang ha can ngoam ciia moi xi lanh se lfi: 43986 (N).
Can cu vao lyc can thidt (F,,;) vfi hfinh trinh lfim vide ciia xilanh thiiy lyc nang hg cfin treo ngogm (S2) ta chpn xilanh thuy luc nfing ha can ngogm la ^80.r450 [14] vdi thdng so ky thugt d bang 02.
TAP C H i KHOA H Q C VA C 6 N G NGHE L A M NGHIFIP SO 4-2014 109
Cong nghipp rirng
Hinh 12. Stf do xdc Sinh hdnh trinh xilanh nang kp ngopm vd lpc tdc dpng tren cSn Bang 02. Thong s6 cua xi lanh thuy Ipv ndng hp can treo ngopm vpn xuat
Dirtmg kinh 4>
(nun)
Di^n tich (cm^) A p suat (kg/cm ) 140
50,3 40,6
IV. KET LUAN
Tham khao tai lieu ket cau ciia cfic loai ngogm Ifip vdi mfiy keo van xuat go trdn thd gidi vfi trong nudc de xfiy dyng mgt s6 phuong fin thiet ke, trdn ca sd dd da lua chpn dupc phuang fin thidt kd hop ly.
Bfing tinh tofin ly thuydt da xfic dinh dupc tfii trgng chuyen ldn nhfit khi van xuat go bfing lidn hpp mfiy kdo DT75 vdi cang ngoam theo phuang phfip kdo mia ldt la Q = 24934 N.
Bfing phuang phap ca hpc ly thuydt da xfic dinh dupc fip lyc can thiet gjiia rfing ngoam vdi go, luc cfin thidt cita cfic xilanh thuy lyc. Kdt qufi dd lam ca sd cho vide thiet ke ngoam van xuat go vfi cfic xilanh thiiy lyc ddng md, nfing ha ngoam.
Bfing phuong phfip ly thuydt thidt kd mfiy dd tinh tofin chpn va kiem tra bdn cfic chi tidt chinh cua ngogm van xufit nhu kdt cfiu vfi kich thudc ciia ngoam, can treo ngogm, khung dd, buldng vfi chdt Ifip ghdp.
Sii dyng phan mem Autocad vfi phucmg phfip CO hgc de xac dinh dupc hfinh ttinh lfim vide va dudng kinh ciia cfic xilanh thuy lyc ddng md
no
ngogm vfi nang ha cfin treo ngogm, cu the la:
Xilanh ddng md ngoam cd dudng kinh 63 mm hfitih trinh 300 mm, xilanh nfing ha ngoam c6 dudng kinh 80 mm vfi hfinh trinh 450 mm.
Ket qufi tinh toan lfi ca sd cho vi$c ehe tao, Ifip rap vfi thu nghiem thidt bi phyc vy ca gidi hda khfiu vgn xuat gd rung tu nhien.
T A I L I | U THAM K H A O
1 -Trinh Chat, Le Van UySn (2002). Tinh todn thiet ke h4 thong ddn dgng ca kltf. Nhk xuk ban giSo d\ic, Ha Npi.
2. Nguyin Nh|t Chieu (1999). Xdc djnh l^rc cdng ngh4 tdc dung ISn mdy keo khi van xudt go theo phuang phdp keo mm let. Ket qua nghien cihi khoa hpc 1995 • 1999. Nha xuat ban Nong nghiep - Uk Npi.
3. Nguyin Trpng Hi?p, Nguyin VSn l i m (1999).
Thiet ke chi tiet mdy. Nhk xuit ban gido dye - HS N^i.
4. Nguyen Van Nam (2006). Tbiet ke ngogm lap tren mdy keo bdnh hai de vdn xudt gd. LuSn vSn lot nghi?p - D^i hpc lam nghidp.
5. Le Van ThSi (2008). Thiit ki. chi tgo ccr cdu k?p go lap tren mdy kio. Chuyen de de tki cap B^: " N ^ 8 n cuu c6ng nghe, cai tiln, thiet kl, chi tao mpt so thiet bj phuc vu khai thdc chpn rung t\r nhien..." nSm 2009.
6. Cataloge camel Hydraulic Cylinder.
TAP CHI KHOA H p c v A CONG NGHE L A M N G H l f P SO 4-2014
Cong nghipp rdng
DESIGN OF THE LOGGING GRAPPLE IMOUNTED ON CLAWER DT75
Le Van Thai
SUMMARY
Log hauling in natural forest is hard work that requires lots of labor forces, so applying mechanization on log hauling is very necessary. Based on results of investigation on logging harvest in natural forest and relevant professional references . The article has presented a solution, a grapple mounted clawer DT75 is designed to skid logs as well as using AutoCAD software and the others mechanical design methods, the article has presented results of design calculations of main components for the hauling system, they are: Crapping teeth, suspension arms, frame, bolt, pin and hydraulic cylinders closing and opening grapple, dropping and lifting suspension arms.
Keywords: Clawer DT75, design, natural forest, log hauling, log skidding, log grapple, logging harvest.
Ngudi phfin bifn Ngfiy nhan bai Ngfiy phfin bi^n Ngay quyet dinh dfing
TS. Pham Minh Due 24/7/2014 20/8/2014 20/10/2014
TAP CHI KHOA HQC VA C 6 N G NGHE L A M NGHIEP SO 4-2014 111