pinion sizing, rack, motor and motor

[meccanicamg]

at this point you can think of mounting counterweights and motors much smaller, type these orientelmotor.
are engines of some ten watts to 4 poles with attached front reducer.
someone has the negative electric brake.
you can deepen and look for the complete catalog to make the right combinations. then if it was also stagnated it would be better, since it is in the rain.

 

[Cadinpiedi]

clearly academic exercise, in the real world if the gate was outdoors would last six months before being seized by meteoric waters and sludge. imagine only the maintainer forced to descend into a dark and cramped cockpit... rather than the racks would be worth using two coupled screw jacks. with adequate choice of translation speeds would also be irreversible, but still hand-operated.

 

[TETRASTORE]

in the real world if the gate was outdoors would last six months before being seized by meteoric waters and sludge. imagine only the maintainer forced to descend into a dark and cramped cockpit. . .

are existing applications; you can see some solutions on youtube by typing: "Red gates disappearing." it is not necessary a well for a oppressor who should do maintenance, it is sufficient a little wide and long enough to contain only the gate; motorizations are in columns outside the ground or slightly underground. Then I don't know how to behave the gate when it is in the underground position under the flooding effect from rain and mud.
I don't think it's possible to use jacks as to have a speed of at least 10 m/min a screw with 5 mm pitch should turn to 2000 rpm, or at lower speeds significantly increasing the step but, in this case, the screw would no longer be irreversible.

Perhaps I did not understand; I ask: do these safety devices intervene in case of blackout? When the power is missing, they arrest the axis, right?

Exactly, if not fed, they block the axis. for return in case of loads higher than a certain predetermined value, sensitive bars with load cells that detect this condition and transmit the signal to the card.

 

[wert]

Exactly, if not fed, they block the axis. for return in case of loads higher than a certain predetermined value, sensitive bars with load cells that detect this condition and transmit the signal to the card.

but then you can't unlock the gate.
is just in case of blackout that becomes necessary to unlock the gate in case of emergency

Different automations, equipped with continuous current motor, can detect the obstacle and reverse automatically, so as to respect the impact curves imposed by the norm without the need for sensitive edges. the electronic card is designed for this function.
In case of alternating current engine instead, yes, sensitive edges are necessary.

 

[zano777⁶]

Good evening, I apologize for the absence in the last days but I have had health problems for which I am putting myself back now, I thank you also for the numerous answers you have given and for the attention you are giving to the project, thank you. returning to the project of the gate, so the engine and the respective gearbox would be better to adopt a single system of the same company?
I had placed the same doubt about blackout, and from what I read in the various answers the best solution would be both in the choice of the engine and in the use of a counterweight associated with oleodynamic "window". in the various answers it was taken into account the use of a lever placed on the motor to release it from the system and thanks to the counterweight contain the inertia of the movement of the gate if done in manual. The problem that arises now is how I do in case I am thinking where the engines are two? to release and move the gate become necessary two people anyway?
also the size of the counterweight how can I make it?
thanks for the courteous attention

 

[meccanicamg]

Good evening, I apologize for the absence in the last days but I have had health problems for which I am putting myself back now, I thank you also for the numerous answers you have given and for the attention you are giving to the project, thank you. returning to the project of the gate, so the engine and the respective gearbox would be better to adopt a single system of the same company?
I had placed the same doubt about blackout, and from what I read in the various answers the best solution would be both in the choice of the engine and in the use of a counterweight associated with oleodynamic "window". in the various answers it was taken into account the use of a lever placed on the motor to release it from the system and thanks to the counterweight contain the inertia of the movement of the gate if done in manual. The problem that arises now is how I do in case I am thinking where the engines are two? to release and move the gate become necessary two people anyway?
also the size of the counterweight how can I make it?
thanks for the courteous attention

the counterweight you calculate almost like the weight of the gate.
If you put a motor only solve the problem.

 

[zano777⁶]

the use of two engines therefore it is to be excluded completely?
using a single engine I have to go for so long to resize the pinion, and also to realize a transmission system?

 

[TETRASTORE]

but then you can't unlock the gate.
is just in case of blackout that becomes necessary to unlock the gate in case of emergency

In this case it would generally take a buffer battery for unlocking but it is a little practical solution and I think no one uses it.

the use of two engines therefore it is to be excluded completely?

for this type of application yes; @ pietro2002 in his post #2 explained what is necessary to have the synchronism of the two engines and is a fairly honest and delicate solution for the environment in which it operates.

using a single engine I have to go for so long to resize the pinion, and also to realize a transmission system?

Yes.
for report knowledge This link that shows you a solution (patented) of a concealed gate that wraps like a blind so it requires a much smaller dig and the water collection is easier.

 

[wert]

In this case it would generally take a buffer battery for unlocking but it is a little practical solution and I think no one uses it.

in reality it is used (or at least the companies producing it as an accessory in their lists) but only for automations with continuous current motor. and in the case of study, since it has gone to a solution balanced by counterweights, the handling with a relatively small cc motor would be possible. I am not sure, however, that the adoption of buffer batteries, at the regulatory level, can exclude the presence of a manual unlocking system.

 

[zano777⁶]

Good morning, I would have a further question regarding the engine and its braking function, as it must be able to sustain and maintain the gate throughout its time. If the engine has a brake force of 3.5 nm, is it enough to hold it? Does the reducer affect it?

 

[zano777⁶]

in reality it is used (or at least the companies producing it as an accessory in their lists) but only for automations with continuous current motor. and in the case of study, since it has gone to a solution balanced by counterweights, the handling with a relatively small cc motor would be possible. I am not sure, however, that the adoption of buffer batteries, at the regulatory level, can exclude the presence of a manual unlocking system.

So we talk about using an ups?
I'm sorry if I'm unfurnished with electronics.

 

[meccanicamg]

Good morning, I would have a further question regarding the engine and its braking function, as it must be able to sustain and maintain the gate throughout its time. If the engine has a brake force of 3.5 nm, is it enough to hold it? Does the reducer affect it?

I have to do the calculations because we went from your model to ours with counterweight.
the braking couple once reached the position is that of the electric parking brake placed in the rear of the motor. the detainment in descent will be made by the motor in couple regulated by inverter because the reality is necessary to get down the gate, let it rise with a low pair, so he drops in difference of torque.

 

[wert]

So we talk about using an ups?
I'm sorry if I'm unfurnished with electronics.

Yeah, some kind of ups. the companies producing automations for gates realize it with a battery pack to connect to the proprietary card that in turn provides the battery charge, when the power supply is present, while it automatically becomes the source of energy when there is a blackout. the system works the same way and you do not notice the difference. Obviously if the blackout is prolonged and the gate has a high frequency of utility, you may download the battery. for this I think the mechanical unlocking is however necessary.

 

[zano777⁶]

If you want to restart the effort on two vertical racks, you can use a motor and a parallel bar, on which the two pinions are mounted.
you must check that the twist bar does not twist too much to avoid phase loss. I do it daily to sync the axes moved by two hydraulic cylinders.

use security factor 1 would say that it is not enough due to dirt, additional accidental loads, the babbeo sitting above.. .
I agree that the engine must have the gearbox. normally you try to turn the engines to 50hz on the nominal turns and the reducer increases the pair and lowers the number of turns to go to as much as you need.

of trade the pinions m=4 are 40mm wide and are in c43 or down there. there are hardened versions but basic are not.
on serious catalogs find the strength that is allowed.
according to the literature to verify a lazy system and rack can be transformed into two gears where the rack becomes a wheel with at least 300 teeth.
you should know that a gear with 14 teeth under cut:View attachment 71264then we find the base of the tooth narrower and therefore weaker. the alternatives are: number of teeth greater...17...18.... or see with shift of positive profile at least with x=0,2.
I chose m=4, z=14, x=+0,2, b=40 because I am accustomed to making profile shifts and I build gears from a specialized company, in this way increase by about 30% the tooth capacity.
View attachment 71263pinion and rack have a bending safety factor on 5000 hours of more than 8 for the pinion and more than 14 for the rack but wear on the pinion is very accentuated and for this it is recommended the surface tempering of 54/56hrc.
also with the free online computer khk gear you get rough the same results with the jis rules.
Obviously dirt, humidity and bad lubrication significantly shorten life.
you can possibly simplify the account using lewiss and make the calculation to wear according to the hardness.

Good morning, I apologize if I disturb you again, I wanted to ask you if you could explain to me how to do bending verification on a pinion with profile shift. if possible if you could also explain to me how this profile shift resulted from interference. Thank you. I'm still sorry.

 

[meccanicamg]

it is necessary that you recover the three volumes of niemann in order to begin to understand the topic gears and then to quizze or borrow from the university the norms iso6336 the whole series.

I'll do it soon. for the interference you have to know that there is a minimum number of teeth that would go respect and at school tell you that under that number you do not go. this because you have a weakening of the base due to the creator who cuts the base.
the profile shift does nothing but bring the primitive diameter of real rolling out with x>0.

to avoid undercut need:[math](\alpha_n)[/math]with zv number virtual teeth and x profile shift coefficient. alpha enne is the normal pressure angle.

 

[meccanicamg]

for the design and verification speech there are these discussions:
- qui
- qui
- qui- geometrically and flex and duration assessment with Japanese legislation similar to agma with all explanations of khk gear qui and the chapter 10.

if you register for free on khk gears you can use the calculator to do the checks.

You can also decide, if you're passionate about it, to make you a nice excel sheet to check.

 

[zano777⁶]

Thank you very much, now I will try to inform me better. Good day