CN215805508U

CN215805508U - Supporting leg oil cylinder

Info

Publication number: CN215805508U
Application number: CN202121715354.6U
Authority: CN
Inventors: 田丰; 田圣佳
Original assignee: Changzhou Trillion Hydraulic And Pneumatic Technology Co ltd
Current assignee: Changzhou Trillion Hydraulic And Pneumatic Technology Co ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2022-02-11
Anticipated expiration: 2031-07-27

Abstract

The utility model discloses a supporting leg oil cylinder which comprises a secondary cylinder barrel, a secondary piston and a primary oil cylinder, wherein the secondary piston and the primary oil cylinder are positioned in the secondary cylinder barrel, and a first oil inlet communicated with a secondary rod cavity and a second oil inlet communicated with a secondary rodless cavity are formed in the secondary cylinder barrel. The primary oil cylinder comprises a primary cylinder barrel with two axial ends communicated and a primary piston assembly positioned in the primary cylinder barrel, and the secondary piston is axially communicated and fixed on the periphery of the primary cylinder barrel; and an oil inlet channel for communicating the first oil inlet with the first-stage rod cavity is arranged on the side wall of the first-stage cylinder barrel. The traditional single-stage supporting leg oil cylinder is improved into an internally and externally sleeved two-stage oil cylinder, the first-stage oil cylinder and the second-stage oil cylinder share a rodless cavity through the first-stage cylinder barrel with two axially through ends, and an internal circulation oil path is formed through the oil inlet channel, so that the number of oil ports connected with an air source is reduced, the stroke of the oil cylinder is improved, and the structure of the oil cylinder is simplified.

Description

Supporting leg oil cylinder

Technical Field

The utility model relates to the technical field of hydraulic oil cylinders, in particular to a supporting leg oil cylinder.

Background

Landing leg hydro-cylinder among the prior art only has the support function, and when subway deep basal pit crane operation, to short distance machine removal can pass through hydraulic motor drive, but to long distance machine transition, then need use car traction head to pull the machine transition, the equipment that needs during the transition is more, and the cost of transition is lower to use car traction head to pull the machine and can produce the vibration of certain degree, influence the quality of machine.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems that the cost is high and the quality of a machine is influenced when the machine is transferred in the prior art, the utility model provides a support leg oil cylinder to solve the problems.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the supporting leg oil cylinder comprises a second-stage cylinder barrel, a second-stage piston and a first-stage oil cylinder, wherein the second-stage piston and the first-stage oil cylinder are located in the second-stage cylinder barrel, the second-stage piston and the first-stage oil cylinder divide the second-stage cylinder barrel into a second-stage rod cavity and a second-stage rodless cavity which are not communicated with each other, and a first oil inlet communicated with the second-stage rod cavity and a second oil inlet communicated with the second-stage rodless cavity are formed in the second-stage cylinder barrel.

The primary oil cylinder comprises a primary cylinder barrel with two axial ends communicated and a primary piston assembly positioned in the primary cylinder barrel, the secondary piston axially penetrates through and is fixed on the periphery of the primary cylinder barrel, and the primary piston assembly and the primary cylinder barrel enclose a primary rod cavity which is not communicated with the secondary rodless cavity; and an oil inlet channel for communicating the first oil inlet with the first-stage rod cavity is arranged on the side wall of the first-stage cylinder barrel.

Furthermore, the first-stage piston assembly comprises a first-stage piston and a first-stage piston rod which are fixedly connected, and the first-stage piston is connected to the circumferential inner side of the first-stage cylinder barrel in a sliding mode.

Furthermore, the primary piston is of a cylindrical structure, and a groove suitable for inserting one end of the primary piston rod is formed in one end, facing upwards, of the primary piston.

Furthermore, the oil inlet channel comprises an axial channel extending along the axial direction of the primary cylinder barrel, an internal oil inlet communicating the axial channel with the primary rod cavity, and a middle oil port communicating the axial channel with the secondary rod cavity, the internal oil inlet is located at the tail end of the primary cylinder barrel, and the middle oil port is close to the secondary piston.

Furthermore, the axial channel extends to one end, facing the second-stage rodless cavity, of the first-stage cylinder barrel, and a plug is mounted at the end of the axial channel.

Furthermore, a first sealing ring is arranged between the circumferential contact surface of the secondary piston and the circumferential contact surface of the secondary cylinder barrel.

Furthermore, a second sealing ring is arranged between the circumferential contact surface of the primary piston and the circumferential contact surface of the primary cylinder barrel, and a third sealing ring is arranged between the circumferential contact surface of the primary piston and the circumferential contact surface of the primary piston rod.

Furthermore, the secondary piston is of a circular ring-shaped structure, and one axial end, close to the primary cylinder barrel, of the secondary piston is fixed.

The utility model has the beneficial effects that:

(1) the traditional single-stage supporting leg oil cylinder is improved into an internally and externally sleeved two-stage oil cylinder, the first-stage oil cylinder and the second-stage oil cylinder share a rodless cavity through the first-stage cylinder barrel with two axially through ends, and an internal circulation oil path is formed through the oil inlet channel, so that the number of oil ports connected with an air source is reduced, the stroke of the oil cylinder is improved, and the structure of the oil cylinder is simplified.

(2) After the support leg oil cylinder supporting device is used, the supporting effect of the support leg oil cylinder is not influenced, the equipment and transition cost is reduced, the working efficiency is high, the labor time is saved, the equipment requirement is reduced, the workpiece quality is stable, and the support leg oil cylinder supporting device can be widely used for hydraulic support legs of subway deep foundation pit cranes and automatic transition loading.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic view of a leg cylinder of the present invention in a retracted state;

FIG. 2 is an enlarged view taken at a in FIG. 1;

FIG. 3 is an enlarged view of FIG. 1 at b;

FIG. 4 is a schematic view of the leg cylinder of the present invention in an extended condition;

FIG. 5 is an enlarged view at c of FIG. 4;

fig. 6 is an enlarged view at d in fig. 4.

In the figure, 1, a second-stage cylinder barrel, 101, a second-stage rod cavity, 102, a second-stage rodless cavity, 2, a second-stage piston, 3, a first-stage oil cylinder, 301, a first-stage cylinder barrel, 302, a first-stage piston, 3021, a groove, 303, a first-stage piston rod, 4, a first oil inlet, 5, a second oil inlet, 6, an oil inlet channel, 601, an axial channel, 602, an internal oil inlet, 603, a middle oil port, 7, a first-stage rod cavity, 8, a third sealing ring, 9, a second sealing ring, 10, a first sealing ring, 11 and a plug.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In a specific embodiment of the present invention, as shown in fig. 1-6, a leg cylinder includes a secondary cylinder barrel 1, and a secondary piston 2 and a primary cylinder 3 located in the secondary cylinder barrel 1, the secondary piston 2 and the primary cylinder 3 divide the secondary cylinder barrel 1 into a secondary rod cavity 101 and a secondary rodless cavity 102 that are not communicated with each other, and the secondary cylinder barrel 1 is provided with a first oil inlet 4 communicated with the secondary rod cavity 101 and a second oil inlet 5 communicated with the secondary rodless cavity 102. The first-stage oil cylinder 3 is equivalent to a piston rod of the second-stage oil cylinder, when the first oil inlet 4 is filled with oil, the first-stage oil cylinder 3 retracts into the second-stage cylinder barrel 1, and when the second oil inlet 5 is filled with oil, the first-stage oil cylinder 3 extends out of the second-stage cylinder barrel 1.

The primary oil cylinder 3 comprises a primary cylinder barrel 301 with two axial ends communicated and a primary piston assembly positioned in the primary cylinder barrel 301, the secondary piston 2 is axially communicated and fixed on the periphery of the primary cylinder barrel 301, and the primary piston assembly and the primary cylinder barrel 301 enclose a primary rod cavity 7 which is not communicated with the secondary rodless cavity 102; an oil inlet channel 6 for communicating the first oil inlet 4 and the first-stage rod cavity 7 is arranged on the side wall of the first-stage cylinder barrel 301. The equal axial of one-level cylinder 301 and second grade piston 2 link up to make the rodless chamber of one-level hydro-cylinder 3 and second grade hydro-cylinder sharing, second grade rodless chamber 102 is the rodless chamber of one-level hydro-cylinder 3 promptly, all through 5 oil feed of second oil inlet, and the one-level has pole chamber 7 then through the 6 oil feeds of oil feed passageway with first oil inlet 4 intercommunication, need not to set up the hydraulic fluid port with outside intercommunication on one-level cylinder 301, reduce the quantity of hydraulic fluid port, only need two air supplies can realize the function of two-stage hydro-cylinder.

The main working principle is as follows: when the supporting leg oil cylinder needs to be jacked, the second oil inlet 5 is filled with oil, the first oil inlet 4 returns oil, the pressure in the second rodless cavity is larger than the pressure in the first rod cavity and the second rod cavity, the hydraulic oil in the second rodless cavity is firstly contacted with the end face of the first-stage piston assembly to push out the first-stage piston assembly, after the first-stage piston assembly completely extends out, the hydraulic oil is continuously filled to the end faces of the second-stage piston 2 and the first-stage cylinder barrel 301, and the second-stage piston 2 and the first-stage cylinder barrel 301 are pushed out (as shown in fig. 4). When the supporting leg oil cylinder needs to be retracted, the first oil inlet 4 feeds oil, the second oil inlet 5 feeds oil, hydraulic oil firstly enters the first rod cavity through the oil inlet channel 6, the primary piston assembly retracts into the primary cylinder barrel 301, and then the secondary piston 2 and the primary oil cylinder 3 retract into the secondary cylinder barrel 1 together (as shown in fig. 1).

The primary piston assembly generally comprises a fixedly connected primary piston 302 and a primary piston rod 303, the primary piston 302 being slidably connected to the circumferentially inner side of the primary cylinder barrel 301. The radial clearance between the primary piston rod 303 and the primary cylinder barrel 301 forms a primary rod cavity 7. In a specific embodiment of the present invention, the primary piston 302 is a cylindrical structure, the primary piston 302 has a groove 3021 into which one end of the primary piston rod 303 is inserted toward one end of the primary piston rod 303, the primary piston rod 303 can be screwed or welded to the primary piston 302, and a third sealing ring 8 is disposed between the circumferential contact surfaces of the primary piston 302 and the primary piston rod 303 to seal the contact surfaces and prevent hydraulic oil from entering between the end surfaces of the primary piston 302 and the primary piston rod 303, and similarly, a second sealing ring 9 is disposed between the circumferential contact surfaces of the primary piston 302 and the primary cylinder 301 to isolate the second rodless chamber from the first rod-containing chamber (as shown in fig. 2).

Because the first-stage rod cavity 7 needs to feed oil and return oil through the first oil inlet 4, when the first-stage oil cylinder 3 extends out of the second-stage cylinder barrel 1 (at the moment, the contact part between the first-stage cylinder barrel 301 and the second-stage rod cavity 101 is the least), the oil feeding channel 6 still needs to be communicated with the second-stage rod cavity 101, and when the first-stage piston rod 303 extends out of the first-stage cylinder barrel 301 (at the moment, the contact part between the first-stage cylinder barrel 301 and the first-stage rod cavity 7 is the least), the oil feeding channel 6 still needs to be communicated with the first-stage rod cavity 7. Preferably, the oil inlet channel 6 includes an axial channel 601 extending along the axial direction of the primary cylinder 301, an internal oil inlet 602 communicating the axial channel 601 with the primary rod chamber 7, and an intermediate oil port 603 communicating the axial channel 601 with the secondary rod chamber 101, the internal oil inlet 602 is located at the end of the primary cylinder 301, the end is the end of the primary cylinder 301 facing the extending direction of the primary piston rod 303, and the intermediate oil port 603 is located near the secondary piston 2. That is, the middle oil port 603 and the inner oil inlet 602 are respectively arranged near the head and the tail ends of the first-stage cylinder barrel 301, the middle oil port 603 leads to the outer periphery of the first-stage cylinder barrel 301, the inner oil inlet 602 leads to the inner periphery of the first-stage cylinder barrel 301, and the middle oil port 603 needs to be located at the rear end of the second-stage piston 2, so that the middle oil port 603 and the second-stage piston 2 at the rear end are communicated with the rod cavity 101. Preferably, a first sealing ring 10 is arranged between circumferential contact surfaces of the secondary piston 2 and the secondary cylinder barrel 1.

Since the axial channel 601 is located in the side wall of the primary cylinder 301, a specific mold is often required to manufacture the primary cylinder 301 with the cavity hidden therein, which increases the processing difficulty, and for this reason, in another embodiment of the present invention, the axial channel 601 extends to an end of the primary cylinder 301 facing the secondary rodless cavity 102, and a plug 11 is installed at an end of the axial channel 601 (as shown in fig. 2 and 5). In a normal state, the end part of the axial channel 601 is plugged by the plug 11 to separate the oil inlet channel 6 from the second-stage rodless cavity 102, and during processing, only the deeper axial channel 601 needs to be drilled at the end part of the conventional first-stage cylinder barrel 301 structure, and then the internal oil inlet 602 and the middle oil port 603 are drilled from the inner side wall and the outer side wall.

The support leg oil cylinder is applied to a crane of a subway deep foundation pit, when long-distance transition is needed, a flat car can be used for conveying a machine to a transition place, the machine is jacked up by the support leg oil cylinder with the lengthened stroke, the machine leaves the surface of the flat car, and then the support leg oil cylinder is retracted after the flat car backs up, so that transition work is completed.

In the description of the present invention, it is to be understood that the terms "inside", "outside", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In this specification, the schematic representations of the terms are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations can be made by the worker in the light of the above teachings without departing from the spirit of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A landing leg hydro-cylinder, its characterized in that: the oil cylinder comprises a secondary cylinder barrel (1), and a secondary piston (2) and a primary oil cylinder (3) which are positioned in the secondary cylinder barrel (1), wherein the secondary piston (2) and the primary oil cylinder (3) divide the secondary cylinder barrel (1) into a secondary rod cavity (101) and a secondary rodless cavity (102) which are not communicated with each other, and a first oil inlet (4) communicated with the secondary rod cavity (101) and a second oil inlet (5) communicated with the secondary rodless cavity (102) are formed in the secondary cylinder barrel (1);

the primary oil cylinder (3) comprises a primary cylinder barrel (301) with two axially-communicated ends and a primary piston assembly positioned in the primary cylinder barrel (301), the secondary piston (2) is axially communicated and fixed on the periphery of the primary cylinder barrel (301), and the primary piston assembly and the primary cylinder barrel (301) enclose a primary rod cavity (7) which is not communicated with the secondary rodless cavity (102);

and an oil inlet channel (6) for communicating the first oil inlet (4) with the first-stage rod cavity (7) is arranged on the side wall of the first-stage cylinder barrel (301).

2. The leg cylinder according to claim 1, characterized in that: the primary piston assembly comprises a primary piston (302) and a primary piston rod (303) which are fixedly connected, and the primary piston (302) is connected to the circumferential inner side of the primary cylinder barrel (301) in a sliding mode.

3. The leg cylinder according to claim 2, wherein: the primary piston (302) is of a cylindrical structure, and one end, facing the upper-stage piston rod (303), of the primary piston (302) is provided with a groove (3021) suitable for inserting one end of the primary piston rod (303).

4. The leg cylinder according to claim 1, characterized in that: the oil inlet channel (6) comprises an axial channel (601) extending along the axial direction of the first-stage cylinder barrel (301), an internal oil inlet (602) communicated with the axial channel (601) and the first-stage rod cavity (7), and an intermediate oil port (603) communicated with the axial channel (601) and the second-stage rod cavity (101), wherein the internal oil inlet (602) is located at the tail end of the first-stage cylinder barrel (301), and the intermediate oil port (603) is close to the second-stage piston (2).

5. The leg cylinder according to claim 4, wherein: the axial channel (601) extends to one end, facing the secondary rodless cavity (102), of the primary cylinder barrel (301), and a plug (11) is mounted at the end of the axial channel (601).

6. The leg cylinder according to claim 1, characterized in that: and a first sealing ring (10) is arranged between the circumferential contact surfaces of the secondary piston (2) and the secondary cylinder barrel (1).

7. The leg cylinder according to claim 2, wherein: and a second sealing ring (9) is arranged between the circumferential contact surface of the primary piston (302) and the circumferential contact surface of the primary cylinder barrel (301), and a third sealing ring (8) is arranged between the circumferential contact surface of the primary piston (302) and the circumferential contact surface of the primary piston rod (303).

8. The leg cylinder according to claim 1, characterized in that: the secondary piston (2) is of a circular ring structure, and one axial end, close to the primary cylinder barrel (301), of the secondary piston (2) is fixed.