CN201273370Y - Split type piston for hydraulic cylinder - Google Patents

Abstract

The utility model relates to a split piston used for a hydraulic cylinder, and the technical scheme is that a piston ring (6) opened with a balancing groove is fixedly installed on a cylinder (11) on the end portion of a piston rod (13), two sides of the assembled piston ring (6) opened with a balancing groove and two sides of the cylinder (11) are respectively located on the same plane on the right and left sides, and the left and right planes are respectively provided with a left and a right annular clamping plates (3,9), the middle positions contacting with the cylinder (11) on the left and the right annular clamping plates (3,9) are respectively provided with a second seal ring (4) and a fourth seal ring (8), the middle positions contacting with the piston ring (6) opened with a balancing groove on the left and the right annular clamping plates (3,9) are respectively provided with a first seal ring (5) and a third seal ring (7), and the outer sides of the left and the right annular clamping plates (3,9) are fastened with a second gasket (10) and a second nut (12) through a first gasket (2) and a second nut (1). The split piston has the characteristics of convenient disassembly and assembly, good sealing performances, low changing cost and long service life.

Description

The split type piston of a kind of oil hydraulic cylinder

Technical field

The utility model belongs to the oil hydraulic cylinder technical field.Be specifically related to a kind of oil hydraulic cylinder with split type piston technical field.

Background technique

For adopting clearance seal and having the oil hydraulic cylinder of compensating groove piston, its balanced seal link realizes with a lot of compensating grooves, compensating groove is the part of piston, the high pressure oil of the oil hydraulic cylinder of this form is by the compensating groove of multiple tracks, its clearance pressure and leakage rate repeatedly are how much numerical value and reduce, and cylinder barrel and piston have concentricity precision height, good seal performance, little, the characteristic of simple structure of frictional force.But for the very high oil hydraulic cylinder of ask for something frequency response, then the wearing and tearing of the outer surface of piston are very fast, and for the oil hydraulic cylinder of this form, very little wearing and tearing also can cause its sealing effect to reduce greatly, so need often to change whole piston; But for some large-scale oil hydraulic cylinders, then cost is very high if will change whole piston.

Therefore, for adopting compensating groove as for the high large hydraulic cylinder of seal means, frequency response, very fast because of its outer surface of piston wearing and tearing, then cost is higher or therefore whole oil hydraulic cylinder is scrapped that then cost is higher if will change piston.

Summary of the invention

The utility model is intended to overcome above-mentioned technological deficiency, and purpose provides a kind of easy accessibility, good seal performance, the split type piston of replacement cost oil hydraulic cylinder low, long service life.

For achieving the above object, the technical solution adopted in the utility model is: the piston ring that will have compensating groove is fixedly mounted on the cylindrical body of piston rod end, the both sides of the piston ring that has compensating groove after the installation and cylindrical both sides lay respectively at the same plane of left and right sides, and this left and right sides plane is respectively arranged with left and right ring-type pressing plate; On left and right ring-type pressing plate, locate to be provided with respectively second seal ring and the 4th seal ring with the neutral position of cylindrical body surface of contact, locate to be provided with respectively first seal ring and the 3rd seal ring with the neutral position of the piston ring surface of contact that has compensating groove; The outside of left and right ring-type pressing plate is undertaken fastening by first packing ring, first nut and second packing ring, second nut respectively.Wherein:

The external diameter of left and right ring-type pressing plate is slightly less than the external diameter of the piston ring that has compensating groove, and the internal diameter of left and right ring-type pressing plate is slightly larger than the piston rod thread external diameter; The cylindrical axial dimension that has the piston ring of compensating groove and piston rod end is equal fully; The diameter that is piston rod is less than major diameter of thread, and major diameter of thread is less than cylindrical diameter; The technical parameter of cylindrical body both sides screw thread is identical; The piston ring and the cylindrical body that have compensating groove are dismountable.

Owing to adopt technique scheme, the utlity model has that easy accessibility, good seal performance, replacement cost are low, the characteristics of hydraulic cylinder piston long service life.Be in particular in:

1, the utility model adopts piston ring and the piston separated structures form have compensating groove, so only need change the piston ring that has compensating groove during replacing, does not need to change whole piston.Therefore, the utility model easy accessibility, replacement cost are low, can prolong the working life of piston and whole oil hydraulic cylinder.

2, the utility model adopts seal ring is contained in structure on the ring-type pressing plate, can be to entering piston and the comprehensive sealing of hydraulic oil that has the piston ring of compensating groove, so good seal performance.

Description of drawings

Fig. 1 is a kind of structural representation of the present utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model being further described, is not the restriction to protection domain.

The split type piston of a kind of oil hydraulic cylinder, as shown in Figure 1, the piston ring 6 that has compensating groove is fixedly mounted on the cylindrical body 11 of piston rod 13 ends, the both sides of the piston ring that has compensating groove 6 after the installation and the both sides of cylindrical body 11 lay respectively at the same plane of left and right sides, and this left and right sides plane is respectively arranged with left and right ring-type pressing plate 3,9; On left and right ring- type pressing plate 3,9, locate to be provided with respectively second seal ring 4 and the 4th seal ring 8 with the neutral position of cylindrical body 11 surface of contact, locate to be provided with respectively first seal ring 5 and the 3rd seal ring 7 with the neutral position of piston ring 6 surface of contact that have compensating groove; The outside of left and right ring- type pressing plate 3,9 is undertaken fastening by first packing ring 2, first nut 1 and second packing ring 10, second nut 12 respectively, first seal ring 5, second seal ring 4, the 3rd seal ring 7, the 4th seal ring 8 have big impacting force, do not leak when guaranteeing work.

Wherein: the external diameter of left and right ring-type pressing plate 3,9 is slightly less than the external diameter of the piston ring 6 that has compensating groove, and the internal diameter of left and right ring-type pressing plate 3,9 is slightly larger than piston rod 13 major diameter of threads; The axial dimension of cylindrical body 11 that has the piston ring 6 of compensating groove and piston rod 13 ends is equal fully; Piston rod 13 ends are step-like, and promptly the diameter of piston rod 13 is less than major diameter of thread, and major diameter of thread is less than the diameter of cylindrical body 11; The technical parameter of cylindrical body 11 both sides screw threads is identical; The described piston ring 6 that has compensating groove is dismountable when it weares and teares with cylindrical body 11, changes easily, saves the cost of changing piston.

This embodiment has that easy accessibility, good seal performance, replacement cost are low, the characteristics of hydraulic cylinder piston long service life.

Claims (5)

1, the split type piston of a kind of oil hydraulic cylinder, the piston ring (6) that it is characterized in that having compensating groove is fixedly mounted on the cylindrical body (11) of piston rod (13) end, the both sides of the piston ring that has compensating groove (6) after the installation and the both sides of cylindrical body (11) lay respectively at the same plane of left and right sides, and this left and right sides plane is respectively arranged with left and right ring-type pressing plate (3,9); On left and right ring-type pressing plate (3,9), be provided with second seal ring (4) and the 4th seal ring (8) respectively with the place, neutral position of cylindrical body (11) surface of contact, locate to be provided with respectively first seal ring (5) and the 3rd seal ring (7) with the neutral position of the piston ring that has compensating groove (6) surface of contact; The outside of left and right ring-type pressing plate (3,9) is undertaken fastening by first packing ring (2), first nut (1) and second packing ring (10), second nut (12) respectively.

2, the split type piston of oil hydraulic cylinder according to claim 1, it is characterized in that the external diameter of described left and right ring-type pressing plate (3,9) is slightly less than the external diameter of the piston ring (6) that has compensating groove, the internal diameter of left and right ring-type pressing plate (3,9) is slightly larger than piston rod (13) major diameter of thread.

3, the split type piston of oil hydraulic cylinder according to claim 1 is characterized in that the axial dimension of cylindrical body (11) of described piston ring (6) that has a compensating groove and piston rod (13) end is equal fully.

4, the split type piston of oil hydraulic cylinder according to claim 1 is characterized in that described piston rod (13) end is step-like, and promptly the diameter of piston rod (13) is less than major diameter of thread, and major diameter of thread is less than the diameter of cylindrical body (11); The technical parameter of cylindrical body (11) both sides screw thread is identical.

5, the split type piston of oil hydraulic cylinder according to claim 1 is characterized in that the described piston ring (6) that has compensating groove is dismountable with cylindrical body (11).

Images