Bài giảng Kỹ thuật nâng & vận chuyển - Chương 2: Các thiết bị mang vật (load handling attachment)

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Bài giảng Kỹ thuật nâng & vận chuyển - Chương 2: Các thiết bị mang vật (load handling attachment). Những nội dung chính trong chương này gồm có: Công dụng của các thiết bị mang vật, phân loại thiết bị mang vật, bộ phận mang vạn năng, bộ phận mang chuyên dùng,... Mời các bạn cùng tham khảo.

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Nội dung Text: Bài giảng Kỹ thuật nâng & vận chuyển - Chương 2: Các thiết bị mang vật (load handling attachment)

KYÕ THUAÄT NAÂNG - VAÄN CHUYEÅN CHÖÔNG 2 CAÙC THIEÁT BÒ MANG VAÄT (Load handling attachment) Chapter II 1 CuuDuongThanCong.com https://fb.com/tailieudientucntt
COÂNG DUÏNG  Duøng ñeå treo, mang vaø di chuyeån vaät  Purpose Hook are multi-purpose handling attachment widely use in hoisting installation. The load is suspended from the hook by means of slings made of hemp ropes or chain. Alternatively, the load can be picked up by a grab suspended from the hook Chapter II 2 CuuDuongThanCong.com https://fb.com/tailieudientucntt
PHAÂN LOAÏI  Boä phaän mang vaïn naêng: moùc ñôn, moùc keùp,voøng treo.(Hooks)  Boä phaän mang chuyeân duøng: 1. Gaàu ngoaïm: cho than, caùt ñaù. 2. Gaàu, thuøng:vaät lieäu loûng. 3. Kìm:theùp taám, theùp ñuùc, thuøng goã coù cuøng kích thöôùc 4. Nam chaâm ñieän:vaät lieäu baèng kim loaïi (tongues, grabs, ladles and buckets, lifting magnets, and grab buckets, handling attachments serve the purpose of picking up the load handled) Chapter II 3 CuuDuongThanCong.com https://fb.com/tailieudientucntt
-Moùc ñôn (Ordinary-pattern hooks) 1. MOÙC -Moùc keùp (Ramshorn hook) Chapter II 4 CuuDuongThanCong.com https://fb.com/tailieudientucntt
1. MOÙC Moùc taám gheùp:( Laminated hooks) -Moùc taám ñôn. (Ordinary) -Moùc taám keùp ( Ramshorn) Popular in high capacity application of load between the laminations, special mild- steel half-bushings are provide for a saving in weight compared with forged counterparts and require no powerful presses for manufacture Chapter II 5 CuuDuongThanCong.com https://fb.com/tailieudientucntt
1. MOÙC (TT) Coâng duïng, vaät lieäu,cheá taïo  Naâng vaät töø traêm ñeán haøng traêm taán  Vaät lieäu theùp ít caùc bon ( theùp 20)  Cheá taïo : reøn, daäp (ñuùc ít söû duïng – caàn kieåm tra khuyeát taät)  Cheá taïo töø caùc theùp taám (Ct3 hoaëc Ct20)- thay theá töøng taám khi hoûng  ( Crane hooks forged or drop-forged from 0,2% C low- alloy steel or 0,2% manganese steel. High carbon steel and cast iron are unsuitable because of a danger of sudden failure of a hook due their brittle behavior ) Chapter II 6 CuuDuongThanCong.com https://fb.com/tailieudientucntt
1. MOÙC (TT) Yeâu caàu  Yeâu caàu kích thöôùc troïng löôïng nhoû nhaát , ñaûm baûo beàn ñeàu ôû moïi thieát dieän  Caùc moùc bò nöùt caàn loaïi boû, khoâng ñöôïc haøn ñaép  Sau khi cheát taïo caàn thöû taûi: 25%Q -10 phuùt  ( Every hook is tested by the manufacturer, using a test load which is 1.25 times the rated capacity. The period of load application is ten minutes and on removing the load the hook should be free from cracks, lacerations or distortion. Wilding up of flaws or other reconditioning of defective hook should not be permitted ) Chapter II 7 CuuDuongThanCong.com https://fb.com/tailieudientucntt
1. MOÙC (tt ): •Tính toaùn moùc Kieåm tra caùc thieát dieän nguy hieåm -Cuoáng moùc: A-A -Thaân moùc: B-B C-C Chapter II 8 CuuDuongThanCong.com https://fb.com/tailieudientucntt
1. MOÙC (tt ):  Cuoáng moùc: A-A - ÖÙng suaát: keùo Q k 2 k .d 1 / 4 daãn ñoäng tay: k =80 N/mm2 daãn ñoäng maùy: k =70 N/mm2(Nh, TB) k =50 N/mm 2 (N,RN) -Chieâuø daøi phaàn ren cuoáng moùc H 4 Qt 2 2 .( d 0 d 1 )[ d ] d =30-50 N/mm2 Chapter II 9 CuuDuongThanCong.com https://fb.com/tailieudientucntt
1. MOÙC (tt ):  Thaân moùc: B – B (Khoâng keå ñoä cong). max Q M u 1 F W1 u k max Q M u 2 F W 2 max d J J M u Q( l1 ) W 2 W1 2 l2 l1  Ñeå: 1 2 W1 W 2 l1 l2 => t.d hình thang. l l b 2 ,5 b1 1,5 1 b d  Keå ñeán ñoä cong. Q M u M u y k u . F Fr K . Fr r y Chapter II 10 CuuDuongThanCong.com https://fb.com/tailieudientucntt
2. KHUNG TREO MOÙC (Hook blocks) Standard head room type Chapter II Short head room type 11 CuuDuongThanCong.com https://fb.com/tailieudientucntt
2. KHUNG TREO MOÙC (tt): Ngaén Daøi  Truïc moùc vaø puly rieâng bieät.  Truïc moùc vaø puly ñoäc laäp:  Soá puly ñoäng chaün (caân baèng). Chapter II 12 CuuDuongThanCong.com https://fb.com/tailieudientucntt
2. KHUNG TREO MOÙC (tt):  Vaät lieäu cheá taïo truïc: Theùp CT4, theùp 15, theùp 20. Chapter II 13 CuuDuongThanCong.com https://fb.com/tailieudientucntt
3. BOÄ PHAÄN MANG CHUYEÂN DUØNG cho haøng ñôn chieác (Grabs and clamps) Chapter II 14 CuuDuongThanCong.com https://fb.com/tailieudientucntt
3. BOÄ PHAÄN MANG CHUYEÂN DUØNG (tt): Kìm (graps) Muïc ñích: -Giaûm thôøi gian buoäc vaø thaùo vaät -Taêng naêng suaát laøm vieäc Graps Crane grabs may be divided in two group: -One for containerized or packed unit loads - The other for unpacked unit load Chapter II 15 CuuDuongThanCong.com https://fb.com/tailieudientucntt
BOÄ PHAÄN MANG CHUYEÂN DUØNG –kìm (tt):  Tongs -type grabs are designed on the assumption that the friction between the gripping surfaces and the load when it is being lifted cause the tongs to exert a squeezing action Chapter II 16 CuuDuongThanCong.com https://fb.com/tailieudientucntt
3. BOÄ PHAÄN MANG CHUYEÂN DUØNG –kìm (tt):  Giöõ vaät baèng ma saùt. F Q Q F 2 fN N 2 f M 0 0 Q a M 0 Nb ( ) S .c 0 2 2  Ñieàu kieän naâng: b a c 0 f 2 cos  Ñieàu kieän an toaøn: F .Q c : f .c : a cos (b f . ) f : 2 b Chapter II 17 CuuDuongThanCong.com https://fb.com/tailieudientucntt
3. BOÄ PHAÄN MANG CHUYEÂN DUØNG CHO VAÄT LIEÄU THEÅ KHOÁI (tt): Chapter II 18 CuuDuongThanCong.com https://fb.com/tailieudientucntt
3. BOÄ PHAÄN MANG CHUYEÂN DUØNG CHO VAÄT LIEÄU THEÅ KHOÁI (tt): Chapter II 19 CuuDuongThanCong.com https://fb.com/tailieudientucntt
4. BOÄ PHAÄN MANG CHUYEÂN DUØNG cho vaät lieäu rôøi Gaøu ngoaïm (grab bucket) Chapter II 20 CuuDuongThanCong.com https://fb.com/tailieudientucntt