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3. TRẢ LỜI:
Một hệ thống thủy lực là một phương tiện dùng áp suất
của lưu chất để truyền năng lượng giữa nơi này đến nơi
hoặc đến một điểm khác
CÂU HỎI:
Thế nào là một hệ thống điều khiển thủy lực ?
132. 1 sec - 9.81 m/sec
0 sec - 0 m/sec
1 kg
TRỌNG LỰC
133. 1 sec - 9.81 m/sec
2 sec - 19.62 m/sec
0 sec - 0 m/sec
1 kg
TRỌNG LỰC
134. 1 kg
1 sec - 9.81 m/sec
2 sec - 19.62 m/sec
3 giây - 29.43 m/giây
0 sec - 0 m/sec
( 0 - 60 mph in less than 3 sec )
GIA TỐC TRỌNG TRƯỜNG
= 9.81 mét / giây 2
GIA TỐC TRỌNG TRƯỜNG
= 9.81 mét / giây 2
TRỌNG LỰC
135. Định luật 2 Newton
Lực = Khối lượg x Gia tốc
1 Newton = 1 kilogam x 1 mét/giây 2
9.81 N = 1 kg x 9.81 m/s2
1 kgKhối lượng của :
9.81 NTrọng lượng
ĐỊNH LẬT 2 NEWTON
136. ( 1 N ≈ 0.1 kg )
1m
ét
1 mét
1 mét2
1 newton trên 1 mét vuông = 1 pascal (Pa)
1 kilo Pascal = 1 000 Pa
1 mega Pascal = 1 000 000 Pa
1 bar = 100 000 Pa
1 bar = 1 kg / cm2
(gần bằng)
1 newton
ĐƠN VỊ ÁP SUẤT
137. ÁP SUẤT (Pa) =
LỰC (N)
DIỆN TÍCH (m2
)
ÁP SUẤT (bar) =
LỰC (N) x 10
DIỆNTÍCH (mm2
)
ÁP SUẤT (bar) =
LỰC (N)
DIỆN TÍCH (cm2
) x 10
TÍNH TOÁN ÁP SUẤT
145. P1 P2
Q Q
P1 - P2 = ∆ P
∆ P ≈ A x Q2
A
Nghĩa là : yêu cầu gấp đôi lưu lượng,
áp suất thay đổi đến 4 lần
ÁP SUẤT TĂNG BẰNG ViỆC GiẢM LƯU LƯỢNG
146. ÁP SUẤT = TRỌNG LƯỢNG ÷ DIỆN TÍCH
ÁP SUẤT = (D.TÍCH x CH.CAO) x TỶ TRỌNG ÷ D.TÍCH
THỂ TÍCH x TỶ TRỌNG
DIỆN TÍCH x CHIỀU CAO
ÁP SUÂT = CHIỀU CAO x TỶ TRỌNG
DIỆNTÍCH
TRỌNG
LƯỢNG
TRỌNG
LƯỢNG
ÁP SUẤT
CH.CAO
Đối với dầu thô (khoáng) ∆P ≈ 0.1 bar / mét
TĂNG ÁP SUẤT BẰNG CỘT ÁP CHẤT LỎNG
151. CÔNG CƠ KHÍ (VÀO)
CÔNG THỦY LỰC (RA)
CÔNG THỦY LỰC = LƯU LƯỢNG x ÁP SUẤT
CÔNG SUẤT ( kW ) =
ÁP SUẤT ( bar ) x LƯU LƯỢNG ( l/min )
600
CÔNG SUẤT
152. P1 P2
Q Q
CÔNG VÀO = P1 x Q CÔNG RA = P2 x Q
NẾU P2 < P1 THÌ (CÔNG RA) < (CÔNG VÀO)
ĐỘ CHÊNH CÔNG SUẤT = NHIỆT
Đối với dầu thô (khoáng) - 1ºC trên 17.5 bar ∆P
CÔNG SUẤT
161. NƯỚC
NƯỚC / DẦU
DẦU KHOÁNG
DẦU THỰC VẬT
DẦU TỔNG HỢP
SỰ BÔI TRƠN
DẦU THỦY LỰC
DẦU THỦY
LỰC
162. NƯỚC
NƯỚC / DẦU
DẦU KHOÁNG
DẦU THỰC VẬT
DẦU TỔNG HỢP
DÃY NHIỆT ĐỘ
DẦU THỦY LỰC
DẦU THỦY
LỰC
163. NƯỚC
NƯỚC / DẦU
DẦU KHOÁNG
DẦU THỰC VẬT
DẦU TỔNG HỢP
KHÔNG ĂN MÒN
DẦU THỦY LỰC
DẦU THỦY
LỰC
164. NƯỚC
NƯỚC / DẦU
DẦU KHOÁNG
DẦU THỰC VẬT
DẦU TỔNG HỢP
TÍNH DỄ BỐC CHÁY
DẦU THỦY LỰC
DẦU THỦY
LỰC
165. NƯỚC
NƯỚC / DẦU
DẦU KHOÁNG
DẦU THỰC VẬT
DẦU TỔNG HỢP
PHƯƠNG DiỆN MÔI TRƯỜNG THÂN THIỆN
DẦU THỦY LỰC
DẦU THỦY
LỰC
166. NƯỚC
NƯỚC / DẦU
DẦU KHOÁNG
DẦU THỰC VẬT
DẦU TỔNG HỢP
GIÁ THÀNH
DẦU THỦY LỰC
DẦU THỦY
LỰC
167. NƯỚC
NƯỚC / DẦU
DẦU KHOÁNG
DẦU THỰC VẬT
DẦU TỔNG HỢP
Bôitrơn
Dãynhiệtđộ
Tínhănmòn
Tínhdễbốccháy
Sinhtháihọc
Giáthành
DẦU THỦY LỰC
DẦU THỦY
LỰC
Notes Hydraulic actuation includes both linear motion (cylinders) for the movement of an excavator bucket, arm and boom together with rotary motion (motors) used for swing and travel.
Notes Double-acting cylinders mean that machine components can be powered in both directions.
Notes Double-acting cylinders mean that machine components can be powered in both directions.
Notes Double-acting cylinders mean that machine components can be powered in both directions.
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Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.
Notes In order to retract the cylinder once it has completed its stroke, a directional control valve is required to switch the fluid to either end of the cylinder (or to block it when no movement is required). Directional valves are most often sliding spool valves.