DE2036299C - Pressure center actuated cylinder - Google Patents

Description

connected to the nal 12, which together with an adjusting slow advance movement of the piston rod screw 13 forms a controllable throttle valve 12, 13 in the andet. The partition 2 also has an opening at the end of the advance movement 14, in which an axially freely moving working chamber d of the piston 3 of the üoppeuco ^ dies double shut-off valve 15, 16 is arranged, 5 bens3,4 with compressed air ^ on ^ agt d ^ ™ * J «whose closing effect optionally by means of a locking Piston rod 5 in the opposite. Direction from member 17 either in the direction of action of the driven. Now, the ^ ^aul ™ valve member 15 or the valve member 16 decreases canceled damping chamber 8, while the ^Dam P ^do g is respectively: the Schließwirkunj "increases in both Ventilglie- chamber 9, but with the Unterscmea the 15 and 16 as shown in FIG 1 Dargestritan Ne * - ~ that the central position of the locking member 17 from the Sperrghed ^ f ^ S ^ uSS is ensured. The 15 of the double shut-off valve IS i,% 6 the ungenm locking member 17 wekT ^ this purpose an eccentric passage of the. ^^ Ϊ ^ ΚπιΤγ 9 ruffles approach 18, which in the damping chamber8 shown in Figure 2 in the steam ^u ngsk.ammery ge position the left Ventügüed O of the double-Ab- In this way the throttle valve, check valve 15, 16 remains in the open position, while x ₅ 13 more or less ineffective so that the right Ventügüed 16 unhindered in the Closing movement of the piston rod S position can be moved. ^{The central attachment 18 is activated} by turning the intermediate positions of the '^ tns locking member 17 by means of a screwdriver. The valve body 15' ^^^^^ 3 ^ 50 acts ^w ^ ⁿ ^ ^r f ^r ™ ' ™ des 17 provided with a slot 19 The locking member that the return movement of the piston rod 5 17 is sealed in the wall of the cylinder can be influenced within certain limits häusesl or the partition 2 is guided and out of the intended the movement of the piston rod ^ S in both the provided with an annular groove 20, in which one of the directions are slowed down, then we externally actuated locking screw 21 engages> 5 locking screw 21 loosened and the > * P * ^T ? & ^ie £ "which on the one hand that Locking member 17 rotated axially in such a way that the eccentric pin 18 he ^^^^^^ SÄ

The operation of the feed unit 30 fol- double piston in 3.4 dei \ Μ ^ * ^ constricting: Referring ^, that the locking member 17, the working chamber 7 and characterized as in F i g. 2 is shown, the valve member 15 of the fene pressure increase in J * "^^ double shut-off valve 15, 16 in the open position or 9 causes in both cases stops If now in the working chamber 7, the piston 4 is now in both directions ^f ^ _B 2S_ the double piston acted 3.4 with compressed air 35 pel valve 15 16 in the. l ^e ^ gen be au then the piston rod 5 is retracted. Due to the supply direction «» «piston rod 5" that was present movement of the piston rod 5 decreases the and Return of the piston rod 5 is damped by the throttle damping channel 9 of the hydraulic part of the valve 12, 13. _F

Feed unit, with the other damping It should also be mentioned that the hrlinching ^ mcM au

chamber 8 by the same amount increases the pressure * o the illustrated embodiment of a Vonchubem increase in the damping chamber 9 causes is integrated limited, but also for ^ eredenk further freely movable in the weft direction VEN bare modifications applicable ^So k ° ^{n "th} ^ »Valve body 16 of the double shut-off valve 15, 16 is pressed against the working chambers 6 7" Jg its seat. The from the damping with a Hydrauhkm.ttel . _t kammer9 vlrdrängte liquid flows through the switch 45 could continue to ^d '% ^A J ^bt adjustable throttle valve 12, 13 in the other damping chamber 6.8 or 7.9 Fung kammers so that the are according to the setting or S 'Jl ^ J ^ throttle valve 12, 13 a more or less arranged in a separate housing below

1 sheet of drawings

Claims (4)

two directions of action of the Dopjje.'kolbens claims: lockable or unlocked in both directions of action. , is lockable 1. Pressure medium-actuated cylinder, in particular this training, has the advantage that the Bewedere hydropneumatic feed unit, with 5 movement of the actuating piston of the cylinder, depending on a special application acting in two directions of action, either in the bar double piston, the two pressure medium-one or the other actuation direction filled damping chambers are assigned, which is attenuated, that is, the adjustable throttle valve when the double piston is acted upon by the piston speed working medium for the desired reduced speed via an adjustable throttle valve is decisive in the other actuation as well as via a shut-off valve If the double shut-off valve is in operative connection, the shut-off element is kept open so that the piston indicates that the shut-off valve is designed as a double-action, undamped, high-speed EPE shut-off valve (15, 16), which follows D In addition, in the neutral position of the externally actuated mechanical locking element, the locking function of the double locking locking element (17) is guaranteed in each of the two locking valves, both in one and the other operating directions of the double piston - (3, 4) lockable or in both directions of action so that gene can be unlocked in this special application. the feed movement and the return movement 2. Working unit according to claim 1, characterized in that 20 of the double piston take place attenuated. Who denotes that the locking member (17) is a torsion-oriented cylinder without constructional verbar is arranged and an eccentric locking changes can be used in a variety of ways, on the one hand has pin (18). Assembly errors are excluded and on the other hand 3. Working unit according to claims 1, a type restriction is achieved, from which a or 2, characterized in that the locking device 25 and simplified storage of the link (17) with a radial annular groove (20) result. hen is into which a locking screw (21) is force- In an advantageous embodiment of the invention and engages positively. tion, the locking member is rotatably arranged and 4. Working unit according to one of claims 1 has an eccentric locking pin. These offer3, characterized in that the blocking 30 order allows space-saving accommodation member (17) with an actuating slot (19) ver the locking member, the eccentric pin also so see is. can be adjusted that the respective opening cross-section of the double shut-off valve is more or is less throttled, whereby the return flow 35 speed of the actuating piston also changed can be. The invention relates to a pressure medium-actuated expediently, the locking member with a The cylinder, in particular the hydropneumatic feed, is provided with a radial annular groove, into which a securing unit engages in a force-fitting and form-fitting manner with a screw that is screwed in two directions of action. on impactable double piston, the two pressure medium 40 this way the locking member is against both self-inflating Damping chambers are assigned, the rotation at term as well as against axial displacement Acting on the double piston with the working in the housing secured. means via a gjn adjustable throttle valve as well as via Further details of the invention will be discussed Check valve reciprocally working with one another in more detail on the basis of an exemplary embodiment commitment. . 45 described. It shows Such actuation and control devices F i g. 1 the longitudinal section through a hydropneu- should axial back and forth movements with sub-matic feed unit and allow different speeds, as shown in FIG. 2 details according to F i g. 1 in another- For example, when supporting a tool, the actuating position of the locking element
machine are common, with the support usually 50. The feed unit has a cylinder housing 1, a slow feed movement and a cutting, which is divided by a partition 2. Performs inner return stroke. half of the cylinder housing 1 is a double piston A well-known feed unit of ben3,4 is arranged, whose common piston above-mentioned type has for this purpose a '' rod 5 penetrates the partition 2 in a sealed manner, simple spring-loaded non-return valve which 55 The free end of the piston rod, which is sealed out of the cylinder housing 1 to slow down the feed speed S can be kept closed by hydraulic pressure and connected to a device to be operated, for example the support of a machine tool opened to increase the return speed. Arrangements of this kind are only for
to use a special purpose. 60 With the double piston 3, 4 the cylinder The invention is based on the object of providing a housing 1 in four chambers 6, 7, 8, 9 on cylinders to create that can be used in many ways divided, of which the outer working chambers 6.7 and independently of the respective flow or return direction via feed lines 10, 11 to a compressed air source can be mounted. are closed, while the internal damping According to the invention, this object is achieved by virtue of the fact that the check valve is connected to the pressure medium source as a double shut-off valve.
is formed, which is actuated from the outside by means of an- The two damping chambers 8, 9 are through mechanical locking member in each of the one of the partition wall 2 penetrating flow channels