CEB Press/Research Development/Hydraulic Design - Revision history

ChuckH at 01:04, 29 December 2011

2011-12-29T01:04:16Z

← Older revision		Revision as of 01:04, 29 December 2011
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	==== Overall ====		==== Overall ====
	There doesn't seem to be an overall relief valve in the system; can we rely on the powercube to have pressure limiting relief? Otherwise pressures could soar when pistons reach end of travel (except at end of drawer advance, where the flow control's internal relief acts). Perhaps use Daman AD05S033S/C manifold with C-10-2 cartridge relief valve.		There doesn't seem to be an overall relief valve in the system; can we rely on the powercube to have pressure limiting relief? Otherwise pressures could soar when pistons reach end of travel (except at end of drawer advance, where the flow control's internal relief acts). Perhaps use Daman AD05S033S/C manifold with C-10-2 cartridge relief valve.
	~~[[Category:CEB]]~~
	~~[[Category:Hydraulics]]~~

	== Design computations ==		== Design computations ==
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	Main cylinder net area (rod side) = A1 - A2 = 19.6in^2 - 3.1in^2 = 13.5in^2<br>		Main cylinder net area (rod side) = A1 - A2 = 19.6in^2 - 3.1in^2 = 13.5in^2<br>
	Main cylinder descent speed = Q/A = 24gpm * 231in^3/gal / 13.5in^2 = 410 in/min = 6.8in/sec<br>		Main cylinder descent speed = Q/A = 24gpm * 231in^3/gal / 13.5in^2 = 410 in/min = 6.8in/sec<br>

			[[Category:CEB_Press]]
			[[Category:Hydraulics]]

ChuckH: /* Overview */

2011-12-28T21:30:45Z

Overview

← Older revision		Revision as of 21:30, 28 December 2011
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	The circuits are arranged in an open-center, series configuration: when no circuits are active, the hydraulic fluid flows freely through the three "open centers" of the valves and returns to the power unit. If a valve is actuated, the fluid flows to that actuator and returns to the power unit.		The circuits are arranged in an open-center, series configuration: when no circuits are active, the hydraulic fluid flows freely through the three "open centers" of the valves and returns to the power unit. If a valve is actuated, the fluid flows to that actuator and returns to the power unit.

	It is also possible to actuate two valves at the same time (e.g. Main Cylinder and Secondary Cylinder); in this situation the fluid leaving the Main Cylinder runs "in series" to the Secondary Cylinder circuit, and both pistons move simultaneously.		It is also possible to actuate two valves at the same time (e.g. for Main Cylinder and Secondary Cylinder); in this situation the fluid leaving the Main Cylinder runs "in series" to the Secondary Cylinder circuit, and both pistons move simultaneously.

	== Circuit Diagram ==		== Circuit Diagram ==

ChuckH: /* Overview */

2011-12-28T21:29:32Z

Overview

← Older revision		Revision as of 21:29, 28 December 2011
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	* '''Shaker Motor''', which vibrates the hopper<br>This circuit is controlled by a 4-way solenoid valve, however only the A coil is used in this design; when energized the motor rotates.		* '''Shaker Motor''', which vibrates the hopper<br>This circuit is controlled by a 4-way solenoid valve, however only the A coil is used in this design; when energized the motor rotates.

	The circuits are arranged in an open-center, series configuration~~. Only one circuit is activated at a time. When~~ no circuits are active, the hydraulic fluid flows freely through the three "open centers" of the valves and returns to the power unit.		The circuits are arranged in an open-center, series configuration: when no circuits are active, the hydraulic fluid flows freely through the three "open centers" of the valves and returns to the power unit. If a valve is actuated, the fluid flows to that actuator and returns to the power unit.

			It is also possible to actuate two valves at the same time (e.g. Main Cylinder and Secondary Cylinder); in this situation the fluid leaving the Main Cylinder runs "in series" to the Secondary Cylinder circuit, and both pistons move simultaneously.

	== Circuit Diagram ==		== Circuit Diagram ==

ChuckH at 19:00, 28 December 2011

2011-12-28T19:00:26Z

← Older revision		Revision as of 19:00, 28 December 2011
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	[[Category:Hydraulics]]		[[Category:Hydraulics]]

	== Design ~~parameters~~ ==		== Design computations ==
	TBD: Pressures, forces, flowrates, power consumption, etc.		TBD: Pressures, forces, flowrates, power consumption, etc.
	Similar to earlier version ([[CEB_Design]])		Similar to earlier version ([[CEB_Design]])

ChuckH: /* Design parameters */

2011-12-28T18:59:35Z

Design parameters

← Older revision		Revision as of 18:59, 28 December 2011
Line 42:		Line 42:
	TBD: Pressures, forces, flowrates, power consumption, etc.		TBD: Pressures, forces, flowrates, power consumption, etc.
	Similar to earlier version ([[CEB_Design]])		Similar to earlier version ([[CEB_Design]])
			----
			From [http://opensourceecology.org/wiki/File:Fullspecs2.jpg Liberator v1.0 spec sheet]
			* Supply pressure: 2300psi operating
			* Supply flow: 24gpm rated, 28gpm max
			* Main cylinder: 5in dia bore, 2in dia rod, 8in full stroke
			* Secondary cylinder: 2.5in dia bore, 1.25in dia rod, 14 in full stroke

			Main cylinder piston area = π/4 * d^2 = π/4 * (5in)^2 = 19.6in^2<br>
			Brick compression force = PA = 2300psi 19.6in^2 = 45080lbf<br>
			Brick compression chamber pressure = F/A = 45080lbf/(6in * 12in) = 626psi<br>

			Main cylinder rising speed = Q/A = 24gpm * 231in^3/gal / 19.6in^2 = 283in/min = 4.7in/sec<br>

			Main cylinder rod area = π/4 * d^2 = π/4 * (2in)^2 = 3.1in^2<br>
			Main cylinder net area (rod side) = A1 - A2 = 19.6in^2 - 3.1in^2 = 13.5in^2<br>
			Main cylinder descent speed = Q/A = 24gpm * 231in^3/gal / 13.5in^2 = 410 in/min = 6.8in/sec<br>

ChuckH: /* Overall */

2011-12-27T22:48:42Z

Overall

← Older revision		Revision as of 22:48, 27 December 2011
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	* Placing the needle valve in the return line causes the return pressure to be high during operation, which is stressful to the shaft seal. Consider moving the needle valve to the inlet side of the motor.		* Placing the needle valve in the return line causes the return pressure to be high during operation, which is stressful to the shaft seal. Consider moving the needle valve to the inlet side of the motor.
	==== Overall ====		==== Overall ====
	There doesn't seem to be an overall relief valve in the system; can we rely on the powercube to have pressure limiting relief? Otherwise pressures could soar when pistons reach end of travel (except at end of drawer advance, where the flow control's internal relief acts).		There doesn't seem to be an overall relief valve in the system; can we rely on the powercube to have pressure limiting relief? Otherwise pressures could soar when pistons reach end of travel (except at end of drawer advance, where the flow control's internal relief acts). Perhaps use Daman AD05S033S/C manifold with C-10-2 cartridge relief valve.
	[[Category:CEB]]		[[Category:CEB]]
	[[Category:Hydraulics]]		[[Category:Hydraulics]]

ChuckH: /* Design parameters */

2011-12-27T22:39:44Z

Design parameters

← Older revision		Revision as of 22:39, 27 December 2011
Line 41:		Line 41:
	== Design parameters ==		== Design parameters ==
	TBD: Pressures, forces, flowrates, power consumption, etc.		TBD: Pressures, forces, flowrates, power consumption, etc.
			Similar to earlier version ([[CEB_Design]])

ChuckH: /* Circuit Description */

2011-12-27T22:38:01Z

Circuit Description

← Older revision		Revision as of 22:38, 27 December 2011
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	The motor case drain port is tee'd into the return line going to valve port B.		The motor case drain port is tee'd into the return line going to valve port B.

	''Design comments~~:''~~		=== Design comments ===
			==== Shaker Motor Circuit ====
	* The case drain connection is unnecessary, as the motor has internal check valves which route case drain to whichever main port is at lower pressure.		* The case drain connection is unnecessary, as the motor has internal check valves which route case drain to whichever main port is at lower pressure.
	* Placing the needle valve in the return line causes the return pressure to be high during operation, which is stressful to the shaft seal. Consider moving the needle valve to the inlet side of the motor.		* Placing the needle valve in the return line causes the return pressure to be high during operation, which is stressful to the shaft seal. Consider moving the needle valve to the inlet side of the motor.
			==== Overall ====
			There doesn't seem to be an overall relief valve in the system; can we rely on the powercube to have pressure limiting relief? Otherwise pressures could soar when pistons reach end of travel (except at end of drawer advance, where the flow control's internal relief acts).
	[[Category:CEB]]		[[Category:CEB]]
	[[Category:Hydraulics]]		[[Category:Hydraulics]]

	== Design parameters ==		== Design parameters ==
	TBD: Pressures, forces, flowrates, power consumption, etc.		TBD: Pressures, forces, flowrates, power consumption, etc.

ChuckH at 21:05, 27 December 2011

2011-12-27T21:05:14Z

← Older revision		Revision as of 21:05, 27 December 2011
Line 35:		Line 35:
	[[Category:CEB]]		[[Category:CEB]]
	[[Category:Hydraulics]]		[[Category:Hydraulics]]
			== Design parameters ==
			TBD: Pressures, forces, flowrates, power consumption, etc.

ChuckH at 21:02, 27 December 2011

2011-12-27T21:02:06Z

← Older revision		Revision as of 21:02, 27 December 2011
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	[[File:CEB_Hydraulic.png\|border]]		[[File:CEB_Hydraulic.png\|border]]

	(Source file: [[File:CEB_Hydraulic.ppt]])		(Source file: [[File:CEB_Hydraulic.ppt]],using [[Hydraulic_Symbol_Library]])
	== Circuit Description ==		== Circuit Description ==
	=== Main Cylinder Circuit ===		=== Main Cylinder Circuit ===