CN218207310U - Long-stroke disorder-prevention two-stage hydraulic cylinder - Google Patents

Abstract

The utility model discloses a long-stroke disorder-preventing secondary hydraulic cylinder, which comprises an outer cylinder barrel, a cylinder bottom, a rodless cavity oil port, a rod cavity oil port, a primary guide sleeve, a primary piston rod, a primary piston, a secondary guide sleeve, a secondary piston rod and a secondary piston; an oil passing cover is fixedly arranged in an inner hole of the primary piston rod, the secondary piston rod is positioned in front of the oil passing cover, a secondary cavity extending oil way communicated with the front end face and the rear end face of the secondary piston rod is arranged in the oil passing cover, an oil passing guide sleeve is fixedly connected in an inner hole at the rear end of the secondary piston rod, the oil passing piston rod passes through the oil passing guide sleeve in a sliding manner, a plug is connected at the rear end of the oil passing piston rod and fixedly connected with the oil passing cover, a secondary cavity contracting oil way connected with the primary piston rod, the oil passing cover and the oil passing piston rod are arranged in the primary piston rod, the secondary piston rod is provided with an oil passing hole communicated with the excircle and the inner hole of the secondary piston rod, and a rod head is fixedly connected at the front end of the secondary piston rod; the utility model discloses its flexible stationarity is good, can realize that the long stroke is not in disorder level, not shake, guarantees the hydro-cylinder steady operation, improves the security.

Description

Long-stroke disorder-prevention two-stage hydraulic cylinder

Technical Field

The utility model relates to a second grade pneumatic cylinder, especially a indiscriminate level second grade pneumatic cylinder is prevented to long stroke.

Background

The existing two-stage cylinder has different requirements under different working conditions, but the same requirement means that the expansion sequence of the two multi-stage cylinders cannot generate the phenomenon of disorder, namely that the expansion of piston rods of all stages needs to act in sequence. However, due to the complicated working conditions, especially when the cylinder is used as a two-stage cylinder for erecting, the push-pull force changes, and the disorder condition occasionally occurs, so that the mechanism action is unstable, and hidden troubles are caused.

Disclosure of Invention

The utility model aims at the above-mentioned not enough of prior art, provide a indiscriminate level second grade pneumatic cylinder is prevented to long stroke, its flexible stationarity is good, can realize the indiscriminate level of long stroke, not shake, guarantees hydro-cylinder steady operation, improves the security.

In order to achieve the purpose, the long-stroke disorder-preventing secondary hydraulic cylinder comprises an outer cylinder barrel, a cylinder bottom, a rodless cavity oil port, a rod cavity oil port, a primary guide sleeve, a primary piston rod, a primary piston, a secondary guide sleeve, a secondary piston rod and a secondary piston, wherein both the two piston rods are provided with inner holes; the novel oil-passing piston rod structure is characterized in that an oil passing cover is fixedly arranged in an inner hole at the rear end of a primary piston rod, a secondary piston rod is positioned in front of the oil passing cover, a secondary cavity-extending oil way communicated with the front end face and the rear end face of the secondary piston rod is arranged in the oil passing cover, an oil passing guide sleeve is fixedly connected in the inner hole at the rear end of the secondary piston rod, the oil passing piston rod with an inner hole slides to pass through the oil passing guide sleeve, a plug is connected at the rear end of the oil passing piston rod and is fixedly connected with the oil passing cover, a secondary cavity-contracting oil way connected with the primary piston rod and the oil passing piston rod is arranged in the primary piston rod, the oil passing cover and the oil passing piston rod, the secondary cavity-contracting oil way is communicated with the excircle of the primary piston rod and the inner hole of the secondary piston rod, and a rod head is fixedly connected at the front end of the secondary piston rod; the sum of the cross section area of the annular cavity between the primary piston rod and the secondary piston rod and the cross section area of the annular cavity between the secondary piston rod and the oil passing piston rod is larger than the sum of the cross section area of the annular cavity between the outer cylinder barrel and the primary piston rod and the outer circle cross section area of the oil passing piston rod;

the utility model discloses the during operation: the initial state is a state that the primary piston rod and the secondary piston rod are completely retracted, when the oil inlet of the oil port of the rodless cavity is filled, the secondary piston rod is arranged in the primary piston rod in front of the oil through cover, the pressure area of the primary piston rod is larger than that of the secondary piston rod, the primary piston rod extends out firstly, and after the stroke is finished, the secondary piston rod is pushed through the oil way of the secondary cavity extending, so that the primary piston rod and the secondary piston rod are extended out sequentially; when an oil inlet is formed in the oil port of the rod cavity, hydraulic oil enters the inner hole of the oil passing piston rod through the oil passage of the secondary contraction cavity, and because the sum of the cross section area of the annular cavity between the primary piston rod and the secondary piston rod and the cross section area of the annular cavity between the secondary piston rod and the oil passing piston rod is larger than the sum of the cross section area of the annular cavity between the outer cylinder barrel and the primary piston rod and the outer circle cross section area of the oil passing piston rod, the secondary piston rod is started to retract first and then the primary piston rod retracts all the time, so that the sequential retraction state and the disorder level of the hydraulic cylinder are achieved, and the oil passing piston rod and the oil passing guide sleeve can ensure that the retraction stability is good during long stroke, and the safety is improved;

as a further improvement of the utility model, the front end of the outer cylinder barrel is provided with a primary exhaust hole, the rod head is internally provided with a secondary exhaust hole, and the two exhaust holes are internally provided with screw plugs; after the primary piston rod and the secondary piston rod extend out, the plug is loosened, air in the cylinder can be exhausted, shaking is prevented, and stable operation of the oil cylinder is realized;

as a further improvement of the utility model, the rear end of the oil through cover is provided with a stepped hole, the excircle of the end cap is provided with an annular groove, a retainer ring is arranged in the annular groove and the stepped hole, and the stepped hole at the rear part of the retainer ring is provided with a positioning ring which is connected with the oil through cover through threads; the structure can realize the fixed connection of the plug and the oil through cover, and is convenient to assemble and disassemble;

to sum up, the utility model discloses a flexible stationarity is good, can realize that long stroke is not in disorder level, not shake, guarantees the hydro-cylinder steady operation, improves the security.

Drawings

Fig. 1 is a front view of the embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, the long-stroke disorder-preventing two-stage hydraulic cylinder of the embodiment includes an outer cylinder barrel 1, a cylinder bottom 2, a rodless cavity oil port 3, a rod cavity oil port 4, a first-stage guide sleeve 5, a first-stage piston rod 6, a first-stage piston 7, a second-stage guide sleeve 8, a second-stage piston rod 9 and a second-stage piston 10, wherein both the two piston rods 6 and 9 are provided with inner holes, the front end of the outer cylinder barrel 1 is provided with a first-stage exhaust hole, and a plug 23 is arranged in the first-stage exhaust hole; an oil passing cover 11 is fixedly arranged in an inner hole at the rear end of the primary piston rod 6 through threads and a set screw, the secondary piston rod 9 is positioned in front of the oil passing cover 11, a secondary cavity extending oil circuit 12 communicated with the front end surface and the rear end surface of the oil passing cover 11 is arranged in the oil passing cover 11, an oil passing guide sleeve 13 is fixedly connected in the inner hole at the rear end of the secondary piston rod 9 through threads, an oil passing piston rod 14 with an inner hole penetrates through the oil passing guide sleeve 13 in a sliding manner, a plug head 15 is welded and connected at the rear end of the oil passing piston rod 14, a stepped hole is arranged at the rear end of the oil passing cover 11, an annular groove is arranged on the excircle of the plug head 15, a retainer ring 16 is arranged in the annular groove and the stepped hole, a plug head positioning ring 17 connected with the oil passing cover 11 through threads is arranged in the stepped hole behind the retainer ring 16, and the plug head 15 and the oil passing cover 11 are fixedly connected through the structure; a second-stage cavity-contracting oil way 18 connected with the first-stage piston rod 6, the oil-passing cover 11 and the oil-passing piston rod 14 is arranged in the first-stage piston rod, the second-stage cavity-contracting oil way 18 is communicated with the excircle of the first-stage piston rod and the inner hole of the oil-passing piston rod 14, a second-stage piston rod 9 in front of the second-stage piston 10 is provided with an oil-passing hole 19 communicated with the excircle and the inner hole of the second-stage piston rod, the front end of the second-stage piston rod 9 is fixedly connected with a rod head 20, a second-stage exhaust hole 21 is arranged in the rod head 20, and screw plugs 22 are arranged in the second-stage exhaust holes 21; the sum of the cross section area of the annular cavity 24 between the primary piston rod 6 and the secondary piston rod 9 and the cross section area of the annular cavity 25 between the secondary piston rod 9 and the oil passing piston rod 14 is larger than the sum of the cross section area of the annular cavity 26 between the outer cylinder barrel 1 and the primary piston rod 6 and the outer circle cross section area of the oil passing piston rod 14;

the utility model discloses the during operation: the initial state is a state that the primary piston rod 6 and the secondary piston rod 9 are completely retracted, when the rodless cavity oil port 3 is filled with oil, the compression area of the primary piston rod 6 comprises the cross sectional areas of the primary piston rod 6, the primary piston 7, the oil through cover 11, the positioning ring 17 and the plug 15, the compression area of the primary piston rod 6 is far larger than that of the secondary piston rod 9 because the secondary piston rod 9 is arranged in the primary piston rod 6 in front of the oil through cover 11, the primary piston rod 6 extends out firstly, after the stroke is finished, the secondary piston rod 9 is pushed by oil through the secondary cavity oil way 12, and the extending sequence of the primary piston rod and the secondary piston rod is achieved; when a rod cavity oil port 4 is used for feeding oil, hydraulic oil enters an annular cavity 26 and enters an inner hole of an oil passing piston rod 14, the annular cavity 24 and an annular cavity 25 through a secondary cavity contracting oil way 18 and an oil passing hole 19, the sum of the cross section area of the annular cavity 24 between a primary piston rod 6 and a secondary piston rod 9 and the cross section area of the annular cavity 25 between the secondary piston rod 9 and the oil passing piston rod 14 is larger than the sum of the cross section area of the annular cavity 26 between an outer cylinder barrel 1 and the primary piston rod 6 and the outer circle cross section area of the oil passing piston rod 14, the secondary piston rod 9 is started to retract all the time, the primary piston rod 6 retracts, and the hydraulic cylinder is set to be in a sequential retraction state and not in disorder, the oil passing piston rod 14 and the oil passing guide sleeve 13 can ensure the retraction stability in a long stroke, and after the primary piston rod 6 and the secondary piston rod 9 extend out, two screws 23 and 22 are loosened, air in the cylinder can be discharged, the shaking is prevented, the stable operation of the oil cylinder is realized, and the safety is improved; the plug 15 and the oil through cover 11 are fixedly connected through the retainer ring 16 and the positioning ring 17, so that the assembly and disassembly are convenient.

Claims (3)

1. A long-stroke disorder-prevention two-stage hydraulic cylinder comprises an outer cylinder barrel, a cylinder bottom, a rodless cavity oil port, a rod cavity oil port, a first-stage guide sleeve, a first-stage piston rod, a first-stage piston, a second-stage guide sleeve, a second-stage piston rod and a second-stage piston, wherein both the two piston rods are provided with inner holes; the device is characterized in that an oil passing cover is fixedly arranged in an inner hole at the rear end of a primary piston rod, a secondary piston rod is positioned in front of the oil passing cover, a secondary cavity extending oil way communicated with the front end face and the rear end face of the oil passing cover is arranged in the oil passing cover, an oil passing guide sleeve is fixedly connected in the inner hole at the rear end of the secondary piston rod, the oil passing piston rod with an inner hole slidably passes through the oil passing guide sleeve, a plug is connected at the rear end of the oil passing piston rod and is fixedly connected with the oil passing cover, a secondary cavity contracting oil way connected with the primary piston rod, the oil passing cover and the oil passing piston rod is arranged in the inner hole, an oil passing hole communicated with the outer circle and the inner hole of the secondary piston rod is arranged on the secondary piston rod in front of the secondary piston rod, and a rod head is fixedly connected at the front end of the secondary piston rod; the sum of the cross section area of the annular cavity between the first-stage piston rod and the second-stage piston rod and the cross section area of the annular cavity between the second-stage piston rod and the oil passing piston rod is larger than the sum of the cross section area of the annular cavity between the outer cylinder barrel and the first-stage piston rod and the outer circle cross section area of the oil passing piston rod.

2. The long stroke anti-random stage two-stage hydraulic cylinder of claim 1, wherein: the front end of the outer cylinder barrel is provided with a first-level exhaust hole, the rod head is internally provided with a second-level exhaust hole, and the two exhaust holes are internally provided with screw plugs.

3. The long stroke anti-random stage two-stage hydraulic cylinder of claim 1 or 2, wherein: the rear end of the oil through cover is provided with a stepped hole, the outer circle of the plug is provided with an annular groove, a check ring is arranged in the annular groove and the stepped hole, and a positioning ring which is connected with the oil through cover through threads is arranged in the stepped hole behind the check ring.

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