DE1967046U - PNEUMATIC DRIVE WITH DAMPING IN THE END POSITIONS. - Google Patents

Description

VEB Vakutronik

Scientific industrial company

Dresden

8021 Dresden

Dornblüthstrasse

ΐΑ.292 327 * 29.5.6 /

__2; g in_the_ end-of-travel positions

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The innovation concerns a pneumatic drive with damping

^v in the end positions for the drive of a movement device with which, for example, a measuring device can be moved from the rest position quickly but without jerks into the working position, or vice versa, soir; ^J

They are used to drive motion devices with linear Movement in both directions, the most diverse designs known on an electrical, hydraulic and pneumatic basis, depending on the requirements in terms of Conditions of use and requirements one or the other

other system allows an optimal solution of the taskV

i. In the case of pneumatic drives, the well-known principle is the cylinder used with piston and piston rod, the piston rod, for example, by means of a stuffing box, round rings, Lip seals or the like is sealed to the cylinder.

The attenuation in the limit positions is achieved, for example, by controlling with the piston rod or to the driven means of their movement by means of stops or linkage means, for example valves, which in turn ^ the air flow in the pneumatic control of the exhaust duct bzwV ·

There are also known versions in which the working piston after covering a certain distance the opening of a control line releases so that the flowing in there Air moves a membrane, which in turn drives devices such as valves, which. control the exhaust duct '.'

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These arrangements have the disadvantage that they are extended when Piston rod occupy a length that composes it from twice the usable path length and the length required to seal the supply lines and to Fixing is necessary '»'. ,. - -

Also the effort required for construction, connection and Fastening elements for controlling the damping very large>

The purpose of the innovation is to create a pneumatic drive for a movement device to, on the one hand, the Carry out the movement process remotely and automatically on the other hand when used for nuclear physics Purposes to achieve a higher level of radiation protection by eliminating the operating personnel at the measuring device »Furthermore should by eliminating the large overall length and the high expenditure, a greater range of applications can be achieved · '

The innovation is based on the task of creating a simple, cheap pneumatic drive, its overall length does not significantly exceed the stroke of the piston and without great effort just before reaching the indposition its movement is braked and slowly moves to the respective end position ".

The task is accomplished with a pneumatic drive consisting of a Cylinder, in which a piston moves, exists and is dampened in the end positions, according to the invention solved in that on both sides of the piston an endless rope as a power transmission element attached is '*.' This rope is from the piston on both sides through a chamber-like multiple seal, the consists of seals and supports and is arranged on the end wall of the cylinder, guided, "Outside the cylinder there is a pulley on each end wall, over which closes the endless rope "» ~

Parallel to the axis of the cylinder, there is a bore and an overflow channel in the wall of the cylinder at each end. A channel is located opposite this hole,

between the and the bore on the one hand and the overflow channel on the other hand there is a control slide chamber ·: In A spring and a valve are arranged in the control slide chamber. This valve, which is at rest by the spring presses against the opening of the overflow channel and closes it, when compressed air is let into the overflow channel pushed by the compressed air in front of the bore that connects the control slide chamber with the cylinder, so that the Exhaust air is prevented from flowing out there and it only escapes slowly via the chamber-like multiple seal can. The offset channel, the control slide chamber connects to the compressed air supply or exhaust line, the control slide is - regardless of its position located - not covered by this ".

The first seal of the chamber-like multiple seal simultaneously seals the cylinder with the receiving element of the chamber-like multiple seal from "" The arrangement of two or several pulleys for the cable pull allows the force application point to be chosen arbitrarily "; '

The advantages achieved are that - by replacing the piston rod with a rope, the overall length is small is achieved and by using pulleys the direction of movement of the piston to the required movement of the moving object can be any * The chamber-like multiple seal used to seal the rope, the similar to a labyrinth seal, it is tight for rapid pressure changes, but is still permeable for slow changes, Permitted due to their properties - at the same time in interaction with the control slide and the one assigned to it Holes for the air flow, one in the end positions. Damping, which saves additional assemblies V.

The innovation will be explained in more detail below using an exemplary embodiment. In the associated drawing

the arrangement of the drive shown after the innovation, '

At a sealed with (pot cuffs 1 piston 2, a rope on both sides attached 3 and guided via deflection rollers. 4, the moving means, not shown, is fastened to a holding piece 5 '', the piston 2 · is in a shown in broken line position 6 'through a channel 7 Compressed air flows into a control slide chamber 8 past a spring 9 through a bore 10 offset in relation to the channel 7 into a cylinder 11 and pushes the piston 2 to the right When the piston 2 has reached a position 12- shown in dashed lines, compressed air also flows into an overflow channel 13 'and there presses a control slide 14' in front of the bore 10 'so that no more air can escape there. " The remaining air to the right of piston 2 is compressed until it has reached the same pressure as the incoming compressed air * 'The piston 2 would then be closed At rest, if the chamber-like multiple seal, which consists of seals 15 and supports 16, slowly a pressure equalization would take place, whereby the piston slowly moves into an end position 17 shown in dashed lines Stop.limited, ¹ If the compressed air is ^{let into channel 7 1} , then the process proceeds accordingly in the other direction * By offsetting channel 7 or '7 ^f with hole 10 or ^1. ' 10 'is achieved that in the event of a rapid switching sequence, when there is still residual compressed air in the "overflow channel 13 or" 13 ", the control slide 14 or 14" the bore 10 or "10" is still closed, the in the channel 7 or; ^f '7 ^f incoming compressed air paves the way itself by moving the control slide 14 or Wi ^J to the right bzY / ». pressed left

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Claims (1)

2Ϊ2 327 * 5/29/67 Protection claims: Pneumatic drive with damping in the end positions, consisting from a cylinder in which a piston is moved to and fro, characterized in that on both sides of the piston (2) an endless rope (3) is attached as a power transmission element in such a way that the rope (3) is on both sides from the piston (2) each through a chamber-like multiple seal, consisting of seals (15) and supports (16) provided in the end wall of the cylinder (11) is, and that outside of the cylinder (11) at each Front wall a guide roller (4) is arranged over the das.endlose rope closes outside the cylinder (11). Pneumatic drive according to Claim 1, characterized in that one at each end in the wall of the cylinder (11) parallel to the cylinder axis. Bore (1Oj 10 ') and an overflow channel (13l 13 ^f ) are provided and offset to the bore (10 $. 10') a channel (7; 7 ') is arranged and between the channel (7> 7 *) and the bore (iOj 10 ') on the one hand and overflow channel (13-13') on the other hand "there is a control slide chamber (8; 8 ^f ), in which a spring (9s 9 ') and a control slide (1 * 4-; 14-') as a valve is arranged V "*."".""· Pneumatic drive according to Claim 1, characterized in that the first seal (15) is the. chamber-like multiple seal at the same time the cylinder (11) with the receiving member the chamber-like multiple seal * ' 4- ^; Pneumatic drive according to claim. 1, characterized in that the force application point can be selected at will by using two or more pulleys - (4-) for the cable pull »'