The invention relates to an actuating valve pneumatic cylinder comprising two pressure chambers separated from one another by a piston connected on a piston rod, which actuating valve comprises two 3/2 port directional control valves as relay valves connectable to a compressed air source and further comprises a valve system connected between these directional control valves and the pneumatic cylinder by which upon actuation of one of the two relay valves one of the pressure chambers can be loaded with compressed air and the other pressure chamber can be relieved of pressure via a venting throttle, respectively.
It is required in connection with such an actuating valve that after release of the respectively actuated relay valve, the pneumatic cylinder or its piston remains loaded with compressed air on both ends, that upon release of the previously actuated valve no further venting or pressure relief of both pressure chambers occurs, but that instead a positional locking of the pneumatic cylinder is effected, i.e., a bidirectional pneumatic cylinder should be moved by means of preferably manually actuated relay valves into its respective end positions and, upon cancellation of actuation, should be directly stoppable in its advancing movement.
This basic task is solved, for example, by a conventional cylinder control by means of a 5/3 port sliding valve that is controllable by two relay valves and has downstream thereof a venting throttle. The relay valves are usually 3/2 port sliding valves. In particular, when employing a 5/3 port sliding valve, this causes sealing problems between the individual valve channels as a result of the significant number of required lip seals.
The invention has the object to provide an actuating valve which does not have the disadvantages which are caused, in particular, by employing a 5/3 port sliding valve.
For solving this object, according to the invention a valve system is provided that comprises two 3/2 port directional control valves arranged immediately upstream of the pneumatic cylinder as well as two check valves which are positioned individually in branch lines connecting one of the relay valves with one of the two 3/2 port directional control valves, wherein a control line extending to the other one of the two 3/2 port directional control valves is connected to the branch line, respectively, wherein by means of the control line the two 3/2 port directional control valves can be moved between their compressed air through positions and their pressure relief positions such that—a) for relay valves that are not actuated the 3/2 port directional control valves are in their compressed air through positions while the relay valves are in a position venting the branch lines; while—b) upon actuation of one of the two relay valves, respectively, it assumes a compressed air through position relative to the branch line connected thereto.
According to another embodiment, the actuating valve comprises two compressed air connecting channels connectable to a bidirectional pneumatic cylinder comprising two pressure chambers, as well as two externally actuatable relay valves for alternating connection of one of the two compressed air connecting channels to a compressed air source, respectively, and for a simultaneous venting action controlled by a venting throttle of the corresponding other compressed air connecting channel, wherein each connecting channel has arranged upstream thereof a valve unit which is comprised of two valve bodies, respectively, provided with sealing rings, which valve bodies are coaxially arranged relative to one another in valve chambers embodied as stepped bores and between which a restoring spring is provided which loads both valve bodies into their closed positions.
A basic principle of the invention resides in that two 3/2 port directional control valves are employed in place of the previously employed 5/3 port sliding valve so that the sealing problems are significantly reduced.
According to a further embodiment of the invention, it is proposed that, overall, slide valves are no longer employed for any of the valve units and, instead, so-called seat valves are used. An actuating valve according to the second embodiment is characterized in particular by its compact configuration thus facilitating its manipulation.
For reasons of simplification with respect to reference numerals, in the claims reference is being had partially only to one valve system, for example, in
According to the invention, the actuating valve according to the invention is preferably employed in connection with a bobbin creel for textile machines as set forth herein.
a shows a basic connection diagram of the actuating valve in the rest position.
b shows the connection diagram in one of the two operating positions.
a shows an enlarged illustration of a part of the valve housing in section.
b shows two of the valve bodies outside of the valve housing.
a shows the actuating valve 23 in the rest position;
According to
When actuating the relay valve L1 by means of the actuating element or key button L9 in the direction of arrow f2, the connection between the line L2 and the branch line L3 is realized so that the check valve L4 is opened and the compressed air can flow via the line L6 into the pressure chamber 8.3. At the same time, via the control line L7 branching off the branch line L3, the 3/2 port directional control valve R5 is adjusted in the direction of arrow f3 into the venting position in which the pressure chamber 8.4 is vented via the line R6 and a venting throttle R10.
Release of the key button L9 causes the relay valve L1 to be returned by the restoring spring L11 into the rest and venting position illustrated in
The actuating valve according to the invention thus combines, when viewed schematically, four separate 3/2 port directional control valves as well as two check valves which are preferably embodied as seat valves and are connected with one another such that, for example, in the case of manual actuation of one of the two relay valves L1, R1, compressed air can flow into one of the two pressure chambers of the pneumatic cylinder while the other pressure chamber is vented in a defined way by means of a venting throttle so that, upon release of the previously actuated relay valve, the pneumatic cylinder remains loaded on both ends with compressed air and, in this way, a positional locking of the pneumatic cylinder or of its piston is realized.
Upon actuation of the relay valve R1 by means of the key button L9, the pressure chamber 8.4 is loaded with compressed air while the pressure chamber 8.3 is vented via the throttle L10 correlated with the 3/2 port directional control valve L5.
The actuating valve 23 illustrated in a preferred configurational embodiment in
According to
The valve body 31 is supported by means of a valve shaft 31.1 with formation of an annular gap in a bore 25.1 of the valve module bottom part 25 such that the section of the bore 25.1 positioned above the valve shaft 31.1 is open toward the surroundings, as illustrated in
A bore section 25.4 and a valve chamber 25.2 adjoin the bore 25.1; a sealing ring 31.2 of the valve body 31 supported on both sides is sealingly guided in the valve chamber upon actuation of the key button R9. The diameter of the bore section 25.4 is greater than the diameter of the valve chamber 25.2 such that the sealing ring, when the relay valve is not actuated, is arranged such in the bore section 25.4 that laterally past this sealing ring 31.2 a connection between the channel 35 and the surroundings is established. The valve chamber 25.2 opens, while forming a valve seat 25.3, into the distribution chamber 28. A channel 35 adjoins laterally the valve chamber 25.2 above the sealing ring 31.2.
A sealing ring 31.4 of the valve body 31 is pressed in the rest position by the spring 33 against the valve seat 25.3, as illustrated in
A stepped bore adjoins the channel 35 according to
The valve body 36 has a valve shaft 36.1 guided in the guide bore 39 which has about its circumference several axial slots 36.2. On the topside of the valve shaft 36.1 a sealing ring 36.3 is provided which in the rest position is forced by the restoring spring 36.4, supported between the lower and upper valve bodies 36, 38, against the valve seat 40.
The valve body 38 has a valve shaft 38.1 guided in the valve chamber 41 which is essentially configured as a hollow cylinder with lateral wall openings 38.2 and whose interior is in communication with the valve chamber 41. This valve body 38 supports a first lower sealing ring 38.3 for cooperation with the valve seat 42 as well as a second upper sealing ring 38.4 for cooperation with the valve seat 44. The valve body 38 is also provided with a piston 38.5 which is sealingly guided in the valve chamber 45.
The actuating valve contains, in addition to the valve unit explained in connection with the valve bodies 31, 36, and 38, a second valve unit which is configured symmetrically thereto whose details are illustrated to the left in FIG. 3 and have the same reference numerals as the valve unit illustrated to the right in
The two valve units are connected to one another in accordance with the control lines L7, R7 of
By pressing down the key button R9, the valve unit to the right in
In order to be able to move the piston 8.2 of the pneumatic cylinder unit 8, it is required to vent the other pressure chamber 8.3. This is realized in such a way that compressed air can flow into the valve chamber 45′ above the valve body 38′ via the control channel 47, the connecting channel 47.1 adjoining it, and the mouth 47.2 so that the valve body 38′ is pressed downwardly causing the sealing ring 38.4′ to be pushed away from its valve seat 44′. In this way, via the connecting lines L6 and 50′ a connection between the pressure chamber 8.3 and the section of the valve chamber 45′ positioned underneath the sealing piston 38.5′ is produced so that the pressure chamber 8.3 is vented by the venting channel 46′ connected to the valve chamber 45′.
In order to prevent a sudden pressure loss in the pressure chamber 8.3, a venting throttle (not illustrated) corresponding to the throttle L10 of
After releasing the key button L9, the lower valve body 36 is pushed downwardly by the restoring spring 36.4 so that the sealing ring 36.3 is pressed against the valve seat 40.
Since after releasing the key button R9 the compressed air supply, supplied via the venting channel system 47, 47.1 and 47.2 to the valve chamber 45′ above the valve body 38′, is canceled, this valve body 38′ is again moved upwardly by the restoring spring 36.4′ so that the sealing ring 38.4′ is pressed against the valve seat 44′.
In this way, the positional locking of the pneumatic cylinder 8, described above in connection with
In order to be able to move, on the one hand, the valve body 36 of the valve unit illustrated to the right and thus the sealing ring 36.3 against the valve seat 30 and, on the other hand, to move the valve body 38′ of the valve unit illustrated to the left in the upward direction and thus move the valve seal 38.4′ into a contact position against the valve seat 44′, it is necessary to relieve the compressed air cushion which is present within the channel system 35, 47, 47.1, and 47.2. For this purpose, the venting system between the channel 35 and the environment is provided which has been described above in connection with the key button L9 in the rest position.
The textile machine 1 only schematically illustrated in
According to
For reasons of stability, the holder 4 forming the stationary member of the four-bar linkage is comprised of two frame parts 4.1 positioned at a spacing to one another. Between them, an upper axle 4.2 and a lower axle 4.3 are supported. The four-bar linkage member 7 is box-shaped with two opposed sidewalls 7.1 which are connected to one another by an end wall 7.4 and between which an upper axle 7.2 and a lower axle 7.3, illustrated in dashed lines, are supported.
On the two upper axles 4.2 and 7.2, the four-bar linkage member 5 is pivotably supported. The four-bar linkage member 6 that is supported on the lower axles 4.3 and 7.3 has the shape of a box profile for reasons of stability.
In the embodiment according to
Each pneumatic piston 8 is preferably controlled by an actuating valve of the above described kind.
According to
Each pneumatic cylinder 8 is a so-called bidirectional pneumatic cylinder loaded at both ends with compressed air; it contains two compressed air chambers which are separated from one another by a piston and can be supplied alternatingly with compressed air.
According to
On the front side of each center stay 11, an actuating valve is provided which is connected by compressed air lines (not illustrated), on the one hand, to a compressed air source and, on the other hand, to the two compressed air chambers of the pneumatic cylinder 8.
For the purpose of pivoting the bobbin creel downwardly into the lower position illustrated in
After completion of the loading or supply process, the piston rod 8.1 is again moved out of the cylinder by means of a corresponding valve actuation so that the bobbin creel 2, assisted by the pneumatic spring 9, is pivoted into its upper position.
While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.
Number | Date | Country | Kind |
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102 18 589 | Apr 2002 | DE | national |
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Number | Date | Country |
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2794136 | May 1999 | FR |
Number | Date | Country | |
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20030201355 A1 | Oct 2003 | US |