SU939850A1

SU939850A1 - Pneumatic cylinder

Info

Publication number: SU939850A1
Application number: SU802929312A
Authority: SU
Inventors: Христиан Филиппович Рамхен; Владимир Александрович Выгловский; Николай Владимирович Васильев
Priority date: 1980-05-23
Filing date: 1980-05-23
Publication date: 1982-06-30

Description

(54) ПНЕВМОЦИЛИНДР(54) PNEUMOCYLINDER

1one

Изобретение относитс к машиностроению, в частности ic силовому приводу и может быть использовано, например в транспорте или строительстве.The invention relates to mechanical engineering, in particular ic power drive and can be used, for example, in transport or construction.

Известен пневмоцилиндр, содержащий корпус , в котором с образованием полостей установлен поршень с полым што-ком , устройство дл фиксации поршн в различных положени х, выполненное в виде самотормоз шейс пары винт-гайка, гайка которой жестко св зана с поршнем, а винт, введенный в полость штока и опирающийс на установленный в ней подшипник, св зан с приводом вращени 1 .A pneumatic cylinder is known, comprising a housing in which, with the formation of cavities, a piston with a hollow rod is installed, a device for fixing the piston in various positions, made in the form of a self-braking screw-nut pair, the nut of which is rigidly connected to the piston, and the screw inserted into the cavity of the rod and supported by the bearing installed in it, which is connected with the rotational drive 1.

Недостатком известного пневмоцилиндра вл етс сложность конструкции и отсутствие проточной смазки трущихс пар, что снижает надежность пневмоцилиндра.A disadvantage of the known pneumatic cylinder is the complexity of the design and the absence of flow lubrication of the rubbing pairs, which reduces the reliability of the pneumatic cylinder.

Цель изобретени - упрощение конструкции и повышение надежности пневмоцилиндра.The purpose of the invention is to simplify the design and increase the reliability of the pneumatic cylinder.

Указанна цель достигаетс тем, что цилиндр снабжен дополнительным поршнем, установленным на подшипнике винта и размещенным в полости штока с образованиемThis goal is achieved by the fact that the cylinder is equipped with an additional piston mounted on the screw bearing and placed in the cavity of the rod to form

рабочей ПОЛОСТИ, а винт выполнен полым с радиальными каналами.working CAVITY, and the screw is made hollow with radial channels.

На фиг. 1 показан продольный разрез предлагаемого пневмоцилиндра; на фиг. 2 узел контакта резьбы гайки с винтом; на фиг. 3 - место дл смазки трущейс пары шток - дополнительный порщень и подшипника .FIG. 1 shows a longitudinal section of the proposed pneumatic cylinder; in fig. 2 screw thread screw contact; in fig. 3 - place for lubrication of the rubbing rod pair - additional piston and bearing.

Пневмоцилиндр состоит из корпуса 1, поршн 2 с полым иггоком 3, образующим рабочую полость 4 и штоковую полость 5. Устройство дл фиксации поршн 2 в разных положени х выполнено в виде гайки 6, жестко соединенной с поршнем 2 и охватывающей полый винт 7, введенный в штоковую полость 5 и опирающийс на установленный в ней подшипник 8. На подшипнике 8 винта 7 установлен дополнительный поршень 9, который образует в штоковой полости 5 рабочую полость 10.The pneumatic cylinder consists of a housing 1, a piston 2 with a hollow arm 3, forming a working cavity 4 and a rod cavity 5. The device for fixing the piston 2 in different positions is made in the form of a nut 6 rigidly connected to the piston 2 and covering the hollow screw 7 inserted into a rod cavity 5 and a bearing 8 mounted therein. An additional piston 9 is mounted on the bearing 8 of the screw 7, which forms in the rod cavity 5 a working cavity 10.

Claims

The screw has radial holes 11 for supplying oil to the points of contact of nut 6 with screw 7 (Fig. 2) and into cavity 5 for lubricating rubbing rod 3 - do39 pair additional piston 9 and nofluninHHKa 8. Oil is supplied through channel 12 through radial holes 13 into the cavity 14 of the screw 7, from which it is ejected through the radial holes 11 under the action of centrifugal force. It delivers just enough oil so that it has time to be drained by gravity through the holes 15 of the nut 6 and further along the channel 16 in m; air collector (not shown) into cavity 10 is carried out through under A movable tube 17 serving at the same time as guiding the nut 6 from turning. The screw 7 is rotated by the electric motor 18. The pneumatic cylinder operates as follows. Depending on the direction of movement chosen, one of the working cavities 4 or 10 is pressurized with air, and the second is connected to the atmosphere. The result is an axial force applied to the hollow rod 3 with the piston 2 and the nut 6 rigidly connected to it, under the action of which the nut 6 chooses play in the direction of the upcoming movement and presses its thread to the screw thread 7. piston 2 in the presence of excess axial force is impossible due to the effect of self-braking screw. The forward movement of the nut 6 and with it the hollow rod 3 with the piston 2 takes place only when the screw 7 is rotated by the electric motor 18. The screw 7 is rotated in the direction in which the movement of the nut 6 coincides with the direction of the axial force applied to the nut 6 and the hollow rod 3 with piston 2. This reduces the power of the electric motor 18 and reduces the weight and size of the pneumatic cylinder. In the process of movement, the nut 6 with its thread is constantly pressed to the thread of the screw 7 and performs with respect to the full rod 3 with the piston 2, with which it is rigidly connected, as if to play a stop, the position of which continuously and smoothly changes with the rotation of the screw 7 By adjusting the speed of rotation of the screw 7 by means of the electric motor 18, we continuously and smoothly adjust the same parameters of the translational movement of the hollow rod 3 with the bite 2. Thus, the neof divergence in the rigid adjustable stops is eliminated and blows are prevented during operation. core, which results in an increase in its reliability. The switching of the working cavities 4 and 10 takes place only when the direction of movement is changed at the moment when the speed of rotation of the shaft of the electric motor 18 is equal to or close to zero. The absence of switching of working cavities 4 and 10 in the process of moving in one direction allows for smooth speed control and uniformity of movement of the hollow brush 3 with the piston 2. The optimum ratio of parameters of self-braking transmission, the use of appropriate lubricant and materials allows to obtain a small and fairly stable the value of the difference between the friction angles and the inclination of the helix in the self-braking transmission, which significantly reduces the load on the electric motor 18 and, consequently, reduces its power t, weight and envelope. Additionally, it is possible to unload the electric motor 18 due to the optimal ratio of friction forces in the guides of the progressively moving parts of the pneumatic cylinder and the force developed by the hollow rod 3 with porous

2. Invention A pneumatic cylinder comprising a body in which, with the formation of working cavities, a piston with a hollow rod is installed, a device for fixing the piston in various positions, made in the form of a self-braking screw-nut pair, the nut of which is rigidly connected to the piston, and a screw inserted into the cavity of the brush and resting on the bearing installed in it, is associated with a rotational drive, characterized in that, in order to simplify the design and increase reliability, it is equipped with an additional piston mounted on the screw bearing and placed in the cavity of the ring to form the working cavity, and the screw is hollow in the radial channels. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 693674, cl. F 15 B 15/26, 1977.