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How can I automate a manual hydraulic machine?
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(Mechanical)
(OP)
19 Jan 16 12:48can you guys help me, giving some ideas on how to automate a manual hydraulic machine that uses a hydraulic jack, or we can use other type of component to press any object.Here the structure so far:I would really appreciate if any of you guys could share any ideas, that would be awesome :)
(Mechanical)
19 Jan 16 13:53automate how?
actuator to replace the human pumping the handle? motor on the release screw?
replace with other hydraulic/servo press?
you don't give any details on its function/forces involved/budget/cycle times/etc.. so an alternate suggestion is impossible.
If you are looking for more details, kindly visit automated hydraulic press.
(Mechanical)
19 Jan 16 14:18Replace the bottle jack with a normal hydraulic cylinder actuated by directional valves and a hydraulic power pack.
Be very careful. A mechanism like this is potentially subject to safety standards that apply to power presses. Due to the significant potential of someone having fingers, hands, or arms flattened, these standards are very stringent. If you don't have experience with this sort of thing, it is likely time to call in the experts - there are plenty of companies that specialise in power presses and would know what needs to be done.
(Mechanical)
19 Jan 16 14:45How much force is really needed? Maybe a motorized screw could be substituted?
(Mechanical)
19 Jan 16 16:32Check Enerpac cylinders. Control with standard solenoid valves, flow controls, and switches to achieve the motion desired. DO NOT ignore BrianPeterson's advice above! Be aware of all safety requirements (OSHA, etc).
(Aerospace)
20 Jan 16 02:56It would likely be cheaper and less hassle to purchase a hydraulic press that already has the control capabilities you require.
When using a hydraulic press with high force capability, you need to be careful. It is very easy to damage parts being assembled when applying several tons of force. A manually operated hydraulic cylinder is actually a good idea in one respect, since it allows some feedback when cycling the pump lever.
(Chemical)
20 Jan 16 12:58If all you want to do is to reduce the amount of manual pumping required, you can buy a pneumatically driven manual jack for very little money.
If you truly want to automate it, you will need to do a lot of work or a little, depending on what the intended purpose is.
(Mechanical)
21 Jan 16 04:39Using a pneumatic cylinder or bellows loses the displacement control inherent in a hydraulic system due to compressibility of the working fluid. I shudder at the thought of using a pneumatic actuator to press a bearing out of a housing!Of course pneumatic over hydraulic is another story.
je suis charlie
(Chemical)
21 Jan 16 13:00 If you read my post, what I suggested was pretty clear:If you read my post, what I suggested was pretty clear:Such a device is, in every meaningful way, STILL a hydraulic jack, with no significant worries due to the compressibility of the working fluid since it is merely used to operate the jack pump mechanism.The term "air over hydraulic" does not properly describe the device I suggested in my opinion.
(Mechanical)
25 Jan 16 03:44True, I didn't read your post carefully enough - apologies!Great photo - havent seen one of those before - gets a star.
je suis charlie
(Mechanical)
25 Jan 16 16:24The jack shown in the first post has a problem as shown. The guide rod blocks access to the bleed screw.
(Mechanical)
26 Jan 16 01:24Enerpac has literature on single and dual stroke hydraulic jacks. In your case you have to figure out if the threaded fittings which one is apparent in your pictures will lend to hose connections to the hydraulic pump which Enerpac also sales. Make sure that the jack maximum allowable working pressure is compatible with the hydraulic pump maximum delivery pressure.
(Mechanical)
26 Jan 16 21:54The jack layout shown in the first post, could possibly be improved by placing the springs on the same axis as the guide rods because at the moment if the sring tension is uneven it might cause the platform to tilt slightly and possibly jamming on the guide rods when retracting.
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My take on the question is that you want an inline air cylinder to do the "pumping" action that the jack handle would normally do.So i sketched up this air logic, apologies for hacking the ANSI symbology....It relies on 2 pneumatic limit switches and a double-detented spool valve. Sometimes they call this 5 port 2 position, but the detent is very important.So how this is supposed to work, the spool valve has two pilots (the little triangle at top and bottom) which control direction of the spool and produce the resultant 2 conditions in the port connections. The detent keeps the spool in a position until its sent to the other position.So each limit switch changes the spool at its end of the travel. The actuator bar on the cylinder rod might need to be a sort of short "cam" so there's enough contact time for the spool to fully switch directions.Two flow controls are going to be required to keep the cylinder from slamming. I assume max pressure will probably be used to get enough force....and I can't size the cylinder for you here without more info. But something in a 1-3" bore is probably enough.It would be a good idea to delve into the air logic/air controls section of Numatics, Festo, SMC, Humphrey(?) and there are certainly others. Just pick a brand and buy used components from ebay would be my recommendation.And...there's no stopping this. So somehow the A-1 main air needs to have some start stop control.
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