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Lecture 9 ການເລືອກໂສ້ລູກກິ້ງພ້ອມຕົວຢ່າງການຄິດໄລ່ໂສ້.pptx Chain selection Ex1. ຂະບວນການອອກແບບໂສ້
DESIGN PROCEDURE
• ຂະບວນການອອກແບບນີ້ແມ່ນໄດ້ເຮັດຕາມມາດຕາຖານ
BS228:1970. ການອອກແບບການຂັບດ້ວຍໂສ້ແມ່ນເຮັດໄດ້
ໂດຍຂະບວນການດັ່ງຕໍ່ໄປນີ້ ແລະ ອ້າງອີງເຖິງຄູ່ມືການ
ອອກແບບ
• ຄຳນວນອັດຕາການທົດຈາກຄວາມຮອບເພົາຕົວເຂົ້າ ແລະ ເພົາ
ຕົວອອກ. ອັດຕາການທົດສູງສຸດຄວນຢູ່ທີ່ 7/1, ຢ່າງໃດກໍ່ຕາມ
ອັດຕາການທົດທີ່ສູງກ່ວານີ້ກໍ່ອາດມີຄວາມເປັນໄປໄດ້ຖ້າຫາກ
ໃຊ້ສອງຂັ້ນການສົ່ງກຳລັງ
( )
RPM driving machine Number of teeth driven machine
DriveRatio VR
RPM driven machine Number of teeth driving machine
2. ຂະບວນການອອກແບບ
DESIGN PROCEDURE
2. ເລືອກຈຳນວນແຂ້ວໂສ້. ເພື່ອລຸດຜ່ອນຕົ້ນທຶນຈຶ່ງຄວນໃຊ້ຈານ
ໂສ້ມາດຕາຖານ. ຈຳນວນແຂ້ວຈານໂສດຕ່ຳສຸດຄວນຈະເປັນ
17. ຖ້າຫາກຈຳນວນແຂ້ວໂສ້ຕ່ຳ ກ່ວານີ້ການຂັບຈະທຳງານທີ່
ຄວາມໄວຮອບຕ່ຳທີ່ສຸດ (ຕ່ຳກ່ວາ 100rpm)
3. ເທິງຈານໂສ້ຕົວໃຫຍ່, ຈຳນວນແຂ້ວໂສ້ປົກກະຕິແລ້ວຈະບໍ່ເກີນ
120 ແຂ້ວ
4. ເສັ້ນກົ່ງຂອງການສຳຜັດຂອງໂສ້ເທິງຈານໂສ້ຕົວນ້ອຍບໍ່ຄວນ
ນ້ອຍກ່ວາ 120o
5. ຊອກຫາ(ເລືອກ)ຕົວປະກອບການໃຊ້ງານ. ຕົວປະກອບການ
ໃຊ້ງານຈະຖືກພິຈາລະນາພາຍໃຕ້ເງື່ອນໄຂເຊິ່ງການຂັບດ້ວຍໂສ້
ຈະທຳງານ. ແຮງສັ່ນທີ່ສ້າງຂຶ້ນໂດຍເຄື່ອງຈັກໃຊ້ງານ ແລະ
3. ຂັ້ນຕອນການອອກແບບ DESIGN PROCEDURE
6. ຄຳນວນ (ເລືອກ) ກໍາລັງງານອອກແບບ Calculate the
Design (selection) power.
7. ເລືອກຂະໜາດຂອງໂສ້ຈາກເສັ້ນສະແດງກຳລັງງານກຳນົດ.
ກຳລັງງານອອກແບບກຳນົດສຳລັບໂສ້ແຖວດຽວ, ສອງແຖວ
ແລະ ສາມແຖວສະແດງຢູ່ໃນສາມເສົາທາງດ້ານຊ້າຍຂອງເສັ້ນ
ສະແດງ. ທີ່ໃດກໍ່ຕາມທີ່ອາດຈະນຳໃຊ້ໂສ້ແຖວດຽວ, ກຳລັງງານ
ກຳນົດຈະສະແດງຢູ່ແກນຕັ້ງ ແລະ ຄວາມໄວຮອບຂອງຈານໂສ້
ຕົວນ້ອຍສະແດງຢູ່ເທິງແກນນອນ, ເມື່ອຂີດເຂົ້າຫາກັນເພື່ອຈະ
ຊອກຫາຂະໜາດຂອງໂສ້ ແລະ ປະເພດຂອງການຫຼໍ່ມື່ນທີ່
ຕ້ອງການ
( )
d
Design Power P Input Power x Service Factor
9. ຂັ້ນຕອນການອອກແບບ DESIGN PROCEDURE
8. ກວດສອບຮູສວມຂອງຈານໂສ້ເພື່ອໃຫ້ເຂົ້າກັບເພົາຖ້າເຮົາໄດ້ຮູ້ເສັ້ນຜ່າ
ສູນກາງຂອງເພົາມາກ່ອນ. ໃຫ້ລາຍລະອຽດກ່ຽວກັບໝາຍເລກ
(ເບີ)ຂອງໂສ້, ຈານໂສ້ ແລະປອກ.
9. ຄຳນວນໄລຍະຫ່າງລະຫວ່າງສູນກາງທີ່ເໝາະສົມ(ຖ້າຫາກບໍ່ໄດ້ໃຫ້
ມາກ່ອນ). ຕາມການແນະນຳ, ໄລຍະຫ່າງລະຫວ່າງສູນກາງຈະປະມານ
30 ຫາ 50 ເທົ່າຂອງຂໍ້ໂສ້ (ຕາມການແນະນຳ)
10.ຄຳນວນຄວາມຍາວຂອງໂສ້ເປັນຈຳນວນຂໍ້ໂສ້ ໂດຍການປັດໃຫ້ເປັນ
ຈຳນວນຖ້ວນ ແລະ ຈຳນວນເລກຄູ່
L= ຄວາມຍາວຂອງໂສ້ເປັນຈຳນວນຂໍ້
19. • 1) ອາດຈະເລືອກຈໍານວນແຂ້ວ ຄືນໃໝ່ ໂດຍເພີ່ມຈໍາ
ນວນຂຶ້ນ
• 2) ເລືອກເບີໂສ້ໃໝ່ໂດຍເອົາເບີໃຫຍ່ຂຶ້ນ.
• ເລືອກ RS100 p=31.75mm
• ແຂ້ວ
• ຈໍານວນແຂ້ວຂອງຈານໂສ້ຕົວໃຫຍ່(ຕົວອອກ)
• ອັດຕາທົດຕົວຈິງ
• ກໍາລັງງານກໍາໜົດສໍາລັບໂສ້ແຖວດຽວ ແຂ້ວ ຄວາມໄວ
ຮອບ 60.83 rpm ໂດຍການ Interpolation
• ??kW
• 14.1
• ເຫັນວ່າ ສາມາດຕອບສະໜອງໄດ້.
20. or 15 T driving to 30 T on 16 B-1 1" simplex chain -
power rating 0.8 x 3.79 = 3.03 kW
25. ແລະ ສໍາລັບຈານໂສ້ໂຕໃຫຍ່ ແຂ້ວ ເສັ້ນຜ່າສູນກາງ
ພິດຈ໌ , ເສັ້ນຜ່າສູນກາງພາຍນອກ mm, ເສັ້ນຜ່າ
ສູນກາງຮູສວມ(Bore pilot)=33mm ເສັ້ນຜ່າ
ສູນກາງຮູສວມສູງສຸດ (Bore max)=80mm,
• ໄລຍະຫ່າງລະຫວ່າງສູນກາງ: ເລືອກ
• ຄວາມຍາວຂອງໂສ້ຄິດໄລ່ເປັນຂໍ້:
Editor's Notes #1: This design procedure complies with BS 228: 1970.
Chain drive design is done by following this procedure and referring to the DESIGN DATA MANUAL page 77.
Calculate the drive ratio R (velocity ratio) given the input RPM and output RPM. The maximum speed ratio shoud be 7/1, although higher ratio are feasible. Two or more stage of reduction can be used to achieve higher ratio
#2: 1. Select sprocket tooth numbers. In order to reduce costs standard sprockets are used - (Chart 1 p77). The minimum number of teeth in a sprocket shoud be 17 unless the drive is operating at a very low speed, under 100rpm
3. The large sprocket shoud normally no more than 120 teeth
4. The arc of contact of chain on smaller sprocket shoud be no smaller than 120o
#3: Select chain size from the power rating chart. The design power rating for simplex, duplex and triplex chains are shown in the three columns on the left hand side of the chart. Wherever possible simplex chains are used. The design power on the vertical axis is referenced with the speed of the smaller sprocket on the horizontal axis to obtain a chain size and lubrication requirements.
#9: 8. Check the maximum sprocket bores against the required shaft diameters if known. List or tabulate details of stock numbers for chain, sprockets and bushes
9. Determine a suitable centre distance if not given. As mentioned a centre distance 30 to 50 times the chain pitch is recommended.
10. Determine the length of chain in number of pitches.
Round off answer to an even number of pitches.
#10: As the chain must be made up of an even number of
pitches, the actual centre distance must be redetermined
so that it corresponds to the chain length calculated
above.
11. Calculate the actual centre distance CA.
12.Determine the sprocket pitch diameters and other dimensions as required.