Drive pneumatic cylinder

FIELD: piston-type pneumatic drive units, namely designs of pneumatic cylinders.

SUBSTANCE: pneumatic cylinder includes sleeve, rod cavity, piston cavity mutually divided by piston with Г-shaped cross section collars arranged in its turnings; spacing rubber round cross section ring placed in groove of piston and pressing sealing petals of Г-shaped cross section collar to sleeve. Said groove has curvilinear convex base having slopes to sides of lateral walls and ridge formed in middle of groove. Said ridge divides two spacing rubber round cross section rings arranged in said groove and pressing respectively sealing petals of Г-shaped cross section collars to sleeve.

EFFECT: enhanced efficiency and operational reliability of pneumatic cylinder.

3 dwg

 

The invention relates to a pneumatic piston and for the design of pneumatic cylinders.

The efficiency of the pneumatic cylinder, its efficiency depends mainly on the work of rod seals and piston.

Known cylinder presented in the book Timbuktu and other Hydraulics hydraulic machines and hydraulic actuators, Meters: machinery, 1982, str-355, is in containing the sealing sleeve, the piston grooves for installing the rubber cuffs V-shaped section, sealing the junction of the sleeve and piston in both directions.

The disadvantages of this design are as follows:

- low resource rubber seals,

low mechanical efficiency due to the large coefficient of friction rubber on steel,

significant effort at the time of moving of the piston.

Closest to the proposed technical solution is the design of the pneumatic cylinder with the sealing piston in patent No. 922372, IPC F 16 J 9/00, 1982, containing a sleeve, a piston groove in which is installed with a preload in the radial direction of the spacer rubber ring, clamped to the cylinder liner sealing mustache cuff D-shaped section.

This device is a prototype.

The design flaws of this technical solution are as follows.

- When working on zero and mA what's the pressure of compressed air, small sections of rubber spacer rings (2,5...3 mm), a sufficiently high hardness rubber spacer ring sealing effect is achieved solely due to the fact that the spacer rubber ring installed in the groove of the piston with the preliminary compression of its cross section in the radial direction, which is provided by the excess of the section diameter of the spacer ring (free status) over the height of the cavity formed straight (cylindrical) the base of the groove and the sealing petals (mustache) cuffs of a G-shaped cross-section are clamped to the sleeve. However, in operation, the pneumatic cylinder wear of the sealing lobes G-ring seals over time may be such that the sealing effect of the impact spacer rubber ring mounted with pre-compression of its cross section in the radial direction, will be sufficient, i.e. sealing the junction of the sleeve and the piston will not be sealed, there will be partecke from one cavity of the pneumatic cylinder to another, which is unacceptable. Limited quantities of compressed air pressure supplied to the pneumatic cylinder, and more precisely in the cavity of the groove to the spacer ring (the maximum value of the pressure of compressed air supplied from a compressor in the shop network Rmax=0,63 MPa (6,3 kgf/cm2), neznacit is supplemented flax magnitude of the cross-section spacer rubber ring (˜ 2,5...3 mm) and relatively high hardness rubber spacer rings not allow supplying even the maximum pressure of the compressed air (P=0,63 MPa) in the cavity of the groove to have a significant deformation of the cross section of the spacer ring (after it is moved in the direction of the impact pressure on the cylindrical base of the grooves to lock in the side surface of the groove)to compensate for the lack of pressing spacer rubber ring l-shaped cuff to the sleeve in case of wear of the sealing petal (USA) above the cuff.

- Manufacture of rubber spacer rings (GOST 9383) as the inner diameter and the diameter of its cross section is rigidly regulated by the above standards, however, due to the fact that the rubber material can result in significant shrinkage after sintering, the cross-section spacer rubber ring may be considerably lower than its nominal size tolerance (according to the drawing), which directly reduces precompression of its cross section while inserting it into the groove on the piston, and accordingly, the quality of the sealing effect will be low.

The technical problem solved by this invention is to increase the efficiency of the pneumatic cylinder and increase its reliability.

For the technical solution in the cylinder containing Ilisu, rod and piston cavity separated by a piston placed in the grooves cuffs of a G-shaped cross-section with a low coefficient of friction, for example, made of PTFE, spacer rubber ring installed in the groove of the piston and clamped sealing petals l-shaped cuffs to the sleeve, the base of the groove is made of a curved-convex with gradients in the lateral walls, with the formation located in the middle of the groove vertices separating installed in the groove of the two spacer rubber ring of circular cross section. Thus, the claimed object matches the criteria of the invention of "novelty". The comparison of the proposed solutions with other technical solutions in this field of technology is not allowed to reveal in them the features distinguishing the claimed solution to the prototype that allowed us to make a conclusion on compliance decisions inventive step.

1 shows a pneumatic cylinder, a General view.

Figure 2 is a view As in figure 1 without the influence of differential pressure compressed air.

Figure 3 shows a view As in figure 1 under the influence of differential pressure compressed air.

The pneumatic cylinder includes a sleeve 1, the piston 2. The piston 2 has two grooves 3, which are located in cuff 4 G-shaped section with the sealing petals (mustache) 5. The piston 2 so the e is made a groove 6 with a curved-convex base 7 grades 8 and 9 in the lateral walls of the groove 6. Curved-convex base 7 of the groove 6 contains the top 10, which is located at equal distances from the side walls of the groove 6, while the top 10 parts installed in the groove 6 two spacer rubber ring 11 of circular cross section. The pneumatic cylinder piston 2 divides the internal volume of the cartridge 1 on the rod 12 and piston 13 of the cavity. The execution of the base 7 of the groove 6 a curved-convex with slope 8 and 9 in the lateral walls of the grooves 6 allows you to have additional compression section of the spacer ring 11 when it is moved from the effects of pressure (P) on tapering towards the top 10 of the groove 6. Automatic compression in the radial direction cross section of the spacer ring 11 is, for example, as wear of the sealing petal 5 G-shaped cuff 4 (when exposed to a constant pressure P) or to compensate for reduced, compared with the estimated pre-compression of the spacer ring 11 (for example, the section diameter of the spacer ring 11 and the thickness of the sealing petal 5 G-shaped cuff 4 and the curved-convex base 7 of the groove 6 provided at the lower tolerance or, as frequently happens, the cross-sectional diameter rubber spacer ring 11 is made low because of shrinkage when casting rubber compound.

Installation in the groove 6 of the two spacer rings 11 allows them shall be equivalent to the sealing effect while applying pressure in the rod cavity 12 of the cylinder, and in the piston 13.

Pneumatic cylinder operates as follows.

To the supply pressure P, for example, in the piston cavity 13 (see figure 2) tightness of the latter is ensured by pre-compression sections of both rubber spacer rings 11. While applying pressure P in the piston cavity 13 in addition to the existing pre-compression section spacer rings 11 (left and right) there is a force that compresses the cross-section of the left spacer ring 11 due to the fact that under the action of pressure P the latter is moved along a curved-convex base 7 having a slope 9, and further tapering towards the top 10 of the groove 6, jams, ensuring the tightness of the piston cavity 13 of the cylinder by acting on the seal 5 petal (left) in the area with most of its elasticity.

When the supply pressure P in the rod cavity 12 (the drawing is not presented because the impact pressure is the same as in figure 2) in addition to having a place to preliminary compression of the sealing lobes 5 G-ring seals 4 using rubber spacer rings 11 to the sleeve 1 is added to the force on the right spacer ring 11, clutching his C-section due to the fact that under the action of pressure P the latter is moved along a curved-convex base 7 of the groove 6 having a slope of 8, and further suraus is the action scene towards the top of the groove 10 6 - is secure preload seal petals 5 (right l-shaped cuff 4) to the sealing surface of the sleeve 1.

Curved-convex base 7 of the groove 6 can also be done in cross-section in the form of a smooth convex curve with a specific radius, while the sealing effect of the sealing joint of the piston sleeve and presented in the cylinder will be equal.

Presents the design of the pneumatic cylinder with dwuhvalentnam (curved-convex) the base of the groove on the piston (to be installed in her two spacer rubber ring of circular cross section) is quite effective and reliable. The compensation was inadequate compression of the cross section of the spacer ring, for example, due to wear mustache cuff, respectively, and the effort of pressing the sealing petal (USA) G-shaped cuff to the sleeve will be implemented as needed automatically by moving the spacer ring to the top of the curved-convex base of the groove of the piston under pressure.

Thus, the proposed design of the pneumatic cylinder provides an opportunity to increase its reliability and efficiency.

Pneumatic cylinder containing a sleeve, rod and piston cavity separated by a piston placed in the grooves cuffs D-shaped section, spacer rubber ring to what's window section, installed in the groove of the piston and clamped sealing the petals of the G-shaped cuff to the sleeve, characterized in that the base of the groove is made of a curved-convex with gradients in the lateral walls of education located in the middle of the groove vertices separating installed in the groove of the two spacer rubber ring of circular cross section, clamped respectively sealing the petals of the l-shaped cuff to the sleeve.



 

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