CN210715371U - Multi-stage oil cylinder and engineering machinery with same - Google Patents

Abstract

The utility model discloses a multistage cylinder and engineering machine tool that has it, multistage cylinder includes: a cylinder barrel defining a chamber therein extending axially therealong, the chamber having an open end; the piston assembly is arranged at intervals along the axial direction of the cavity and comprises a first piston assembly to an Nth piston assembly which are sequentially nested from outside to inside, wherein N is an integer larger than or equal to 2, the first piston assembly is provided with a first rod cavity and a first rodless cavity, the Nth piston assembly is provided with an Nth rod cavity and an Nth rodless cavity, a piston rod of the Nth-1 piston assembly is provided with a plurality of oil holes which are distributed at intervals along the axial direction of the piston rod, and each oil hole can enable the Nth rodless cavity to be communicated with an oil circuit in the Nth-1 rod cavity; and the sealing elements are arranged on the piston of the Nth piston assembly and are distributed at intervals along the axial direction of the piston. The multistage oil cylinder has the advantages of simple structure, simplicity in assembly, excellent sealing structure performance and the like.

Description

Multi-stage oil cylinder and engineering machinery with same

Technical Field

The utility model belongs to the technical field of engineering machine tool, especially, relate to a multistage cylinder and engineering machine tool who has it.

Background

In the existing environment, the reverse-erection action of equipment needs to be completed through a special vehicle, which needs the special vehicles to operate by using double-acting multi-stage erection cylinders, but because the multi-stage cylinders are limited by installation size, appearance space and total weight, the sealing performance of the erection cylinders needs to be fully considered in the construction process, and the existing sealing scheme adopts the design of using sealing ring through-hole type in the multi-stage cylinders.

However, in the actual use process, when the sealing ring through hole type design is used for pressure maintaining at the sealing ring through hole, the risk of internal leakage exists due to poor sealing performance caused by superposition of the oil hole and the sealing ring, and meanwhile, the requirements of the existing engineering project on the processability, reliability and maintainability of the multi-stage oil cylinder are higher and higher, so that the multi-stage oil cylinder with excellent sealing performance needs to be designed to meet the requirements of the existing engineering machinery on the multi-stage oil cylinder.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least.

In view of this, the utility model provides a multistage cylinder, this multistage cylinder structure is simple and easy, and the assembly is simple and seal structure performance is excellent.

The utility model also provides an engineering machine tool with multi-stage cylinder, this engineering machine tool convenient to use, small and stable performance.

According to the utility model discloses multistage hydro-cylinder of first aspect embodiment, include: a cylinder defining a chamber therein extending axially therealong, the chamber having an open end; the piston assembly is arranged along the axial direction of the cavity and comprises a first piston assembly to an Nth piston assembly which are sequentially nested from outside to inside, wherein N is an integer larger than or equal to 2, the first piston assembly is provided with a first rod cavity and a first rodless cavity, the first rod cavity is matched with the first rodless cavity so that a piston rod of the first piston assembly extends out of or retracts into the opening end, the Nth piston assembly is provided with an Nth rod cavity and an Nth rodless cavity, the Nth rod cavity is matched with the Nth rodless cavity so that a piston rod of the Nth piston assembly extends out of or retracts into the opening end, a plurality of oil holes are distributed on the piston rod of the Nth piston assembly at intervals along the axial direction of the piston rod, and each oil hole can enable the Nth rodless cavity to be communicated with an oil path in the Nth-1 rod cavity; and the sealing elements are arranged on the piston of the Nth piston assembly and are distributed at intervals along the axial direction of the piston.

According to the utility model discloses multistage oil cylinder is through being provided with a plurality of sealing members on the piston of N piston assembly, is equipped with a plurality of oilholes on N-1 piston assembly's piston rod, cooperatees through a plurality of sealing members and a plurality of oilholes, makes multistage oil cylinder in the use, at the position pressurize during operation of sealing member and oilhole coincidence, reduces the risk of the internal leakage that it exists.

According to the utility model discloses multistage hydro-cylinder can also have following additional technical characterstic:

according to the utility model discloses an embodiment, the sealing member is located for the cover sealing washer on the piston of N piston assembly.

According to the utility model discloses an embodiment, the quantity of oilhole be two, the quantity of sealing washer is two, two minimum distance between the oilhole is greater than two maximum distance between the sealing washer.

According to an embodiment of the present invention, an aperture of an end of the oil hole adjacent to the N-1 th rodless chamber is larger than an aperture of an end of the oil hole adjacent to the N-1 th rodless chamber.

According to the utility model discloses an embodiment, the oilhole is the shoulder hole.

According to the utility model discloses an embodiment, be equipped with on the piston of Nth piston assembly: the mounting groove is an annular groove extending inwards along the peripheral surface of the piston, and the sealing ring is sleeved in the mounting groove.

According to the utility model discloses an embodiment, the sealing washer is followed the axial thickness of cylinder is greater than the oilhole with the radial dimension of the relative one end that sets up of sealing washer.

According to the utility model discloses an embodiment, the sealing washer material is elastic rubber spare.

According to an embodiment of the invention, the sealing ring is a gray ring.

According to the utility model discloses engineering machine tool of second aspect embodiment includes the multistage hydro-cylinder of any one of above-mentioned embodiment.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a cross-sectional view of a prior art multi-stage cylinder;

FIG. 2 is a cross-sectional view of another multi-stage cylinder of the prior art;

FIG. 3 is an enlarged view of area B of FIG. 2;

fig. 4 is a cross-sectional view of an extended configuration of a multi-stage cylinder according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of a multi-stage cylinder according to an embodiment of the present invention in a contracted configuration;

fig. 6 is an enlarged schematic view of the area a in fig. 4.

Reference numerals:

a multi-stage cylinder 100;

a cylinder barrel 10;

a piston assembly 20;

a seal member 30; a seal ring 31; a mounting groove 32;

an Nth piston assembly 40; the Nth rod chamber 41; the nth rodless cavity 42;

an N-1 piston assembly 50; the N-1 th rod chamber 51;

and oil holes 60.

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 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 drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The multi-stage cylinder 100 according to the embodiment of the present invention is an invention made by the inventor of the present application based on the following facts.

As shown in fig. 1, fig. 1 shows an existing erecting oil cylinder, which protects the sealing performance of materials by adopting a sandwich structure in the using process, but in the actual using process, the erecting oil cylinder of the structure has the disadvantages of large outer diameter, heavy weight, complex structure, large number of processed parts, high tolerance requirement, more fit size and higher assembly requirement, and in the actual using process, the erecting oil cylinder of the structure has higher use failure rate and higher maintenance difficulty and cannot meet the use requirement of the erecting oil cylinder of the structure in the existing environment, so that the erecting oil cylinder of the structure shown in fig. 2 and 3 is developed, the single-ring sealing ring is arranged on a multi-stage piston assembly of the erecting oil cylinder of the structure, a sealing structure can be formed inside the multi-stage oil cylinder, but in the actual using process, because the structure adopts the single-ring sealing ring, when a piston rod of the piston assembly extends out, the position where the sealing ring coincides with the oil hole is subjected to pressure maintaining operation, the sealing ring can be embedded into the oil hole under the action of extrusion, so that the multi-stage oil cylinder is subjected to internal leakage, and therefore an oil cylinder structure with good pressure maintaining performance and high reliability needs to be found under the condition that the appearance and the stroke of the oil cylinder are not changed.

The multi-stage cylinder 100 according to the embodiment of the present invention will be described first.

As shown in fig. 4 to 6, the multi-stage cylinder 100 according to the embodiment of the present invention includes a cylinder tube 10, a piston assembly 20, and a plurality of sealing members 30.

Specifically, a chamber extending along an axial direction of the cylinder 10 is defined in the cylinder 10, the chamber has an open end, the piston assembly 20 is disposed along the axial direction of the chamber and includes a first piston assembly to an nth piston assembly 40 nested in sequence from outside to inside, where N is an integer greater than or equal to 2, the first piston assembly is provided with a first rod chamber and a first rodless chamber, the first rod chamber is matched with the first rodless chamber to extend or retract a piston rod of the first piston assembly to the open end, the nth piston assembly 40 is provided with an nth rod chamber 41 and an nth rodless chamber 42, the nth rod chamber 41 is matched with the nth rodless chamber 42 to extend or retract the piston rod of the nth piston assembly 40 to the open end, the piston rod of the nth-1 piston assembly 50 is provided with a plurality of oil holes 60 distributed at intervals along the axial direction thereof, each oil hole 60 can enable the nth rodless chamber 42 to communicate with an oil path in the nth-1 rod chamber 51, a plurality of seals 30 are provided on the piston of the nth piston assembly 40 and are spaced axially therealong.

In other words, according to the utility model discloses multistage hydro-cylinder 100 mainly comprises cylinder 10, piston assembly 20 and a plurality of sealing member 30, is equipped with first piston assembly to nth piston assembly 40 inside cylinder 10, and N is greater than or equal to 2. The first piston assembly to the Nth piston assembly 40 are sequentially arranged from the inner wall surface of the cylinder barrel 10 to the inner wall surface, the first piston assembly is sleeved on the periphery of the second piston assembly, the rest is done, and the Nth-1 piston assembly 50 is sleeved on the periphery of the Nth piston assembly 40. When N is equal to 2, as shown in fig. 4 and 5, the first piston assembly is sleeved on the outer periphery of the second piston assembly. A plurality of oil holes 60 are distributed on the piston rod of the first piston assembly at intervals, the plurality of oil holes 60 are distributed at intervals along the axial direction of the piston rod of the first piston assembly, a plurality of sealing elements 30 are distributed on the piston of the second piston assembly at intervals, and the plurality of sealing elements 30 are also distributed at intervals along the axial direction of the piston of the second piston assembly. By providing the oil hole 60, the oil passages in the first rod chamber and the second rodless chamber can be communicated, and the piston rod of the second piston assembly can be extended or retracted. By distributing the sealing elements 30 on the piston of the second piston assembly, at least one sealing element can separate the rodless cavity from the rod cavity in any position in the extending process of the piston rod of the second piston assembly, so that the pressure maintaining reliability of the rodless cavity is improved.

From this, according to the utility model discloses multistage cylinder 100 adopts cylinder 10, piston assembly 20 and a plurality of sealing member 30 to combine together, through be provided with a plurality of sealing members 30 on the piston of N piston assembly 40, be equipped with a plurality of oilholes 60 on the piston rod of N-1 piston assembly 50, cooperate through a plurality of sealing members 30 and a plurality of oilholes 60, make multistage cylinder 100 in the use, even when sealing member 30 and oilhole 60 coincide, multistage cylinder 100 also can pressurize work, reduce the risk of the internal leakage that multistage cylinder 100 exists.

As shown in fig. 4 and 5, according to an embodiment of the present invention, the sealing member 30 is a sealing ring 31 sleeved on the piston of the nth piston assembly 40, wherein the sealing member 30 includes a sealing ring 31 and a mounting groove 32, and the sealing member 30 can preferably be the sealing ring 31 as a sealing structure in the nth piston assembly 40, and meanwhile, the sealing ring 31 can be used for facilitating installation and detachment in actual production and use, and has a wide source and reduced production and processing costs.

The utility model discloses an among some embodiments, the quantity of oilhole 60 is two, and the quantity of sealing washer 31 is two, and minimum distance between two oilholes 60 is greater than the maximum distance between two sealing washers 31. On one hand, the two oil holes 60 are designed on the piston rod, so that the stable performance of oil supply and discharge can be regulated and controlled when the oil cylinder is used for supplying and discharging oil; in another aspect, the two oil holes 60 are matched with the two sealing rings 31, and by designing the distance between the two oil holes 60 and the distance difference between the two sealing rings 31, when any sealing ring 31 coincides with one oil hole, the other sealing ring 31 and the other oil hole 60 can be effectively staggered in the process of extending the piston rod of the nth piston assembly. For example, even if the first sealing ring 31 and the first oil hole are subjected to internal leakage when being superposed for the first time, the second sealing ring 31 can still be staggered with the two oil holes 60, so that effective sealing is formed inside the multistage oil cylinder 100; when the second seal ring 31 is overlapped with the second oil hole, the first seal ring 31 and the first oil hole are staggered to form effective seal; and finally, when the piston rod of the Nth piston assembly extends out completely, the two sealing rings 31 are positioned between the two oil holes, so that the sealing performance of the piston assembly is more excellent.

Further, the bore diameter of the end of the oil hole 60 adjacent to the N-1 th rodless chamber 51 is larger than the bore diameter of the end of the oil hole 60 adjacent to the N-1 th rodless chamber 42.

The utility model discloses an among some embodiments, oilhole 60 is the shoulder hole, and the design that adopts the shoulder hole can make multistage cylinder 100 increase the fluid latus rectum when using, and then through the stair structure buffering oil speed, improves multistage cylinder 100's use stability ability.

Optionally, a mounting groove 32 is formed in the piston of the nth piston assembly 40, the mounting groove 32 is an annular groove extending inwards along the outer peripheral surface of the piston, the sealing ring 31 is sleeved in the mounting groove 32, the mounting groove 32 can effectively limit and fix the position of the sealing ring 31, and therefore the problem that the sealing ring 31 leaks inwards due to sliding when the multistage oil cylinder 100 is used is prevented, installation is facilitated, and sealing performance during assembly and use is improved.

According to the utility model discloses an embodiment, sealing washer 31 is greater than the radial dimension of the relative one end that sets up of oilhole 60 and sealing washer 31 along the axial thickness of cylinder 10, and through injecing oilhole 60 size and sealing washer 31 size, prevent that sealing washer 31 from blocking in oilhole 60 in multistage oil cylinder 100 motion process, leading to the not good problem of its sealing performance.

Further, the material of the seal ring 31 is an elastic rubber member, and the sealing performance of the multi-stage oil cylinder 100 is further improved by the elastic rubber member.

The utility model discloses an among some embodiments, sealing washer 31 is the glary circle, through the glary circle that sets up inside and outside structure, in the use of multi-stage cylinder 100, the inlayer sealing washer can be realized effectively fixedly through frictional force with the piston rod, and outer square seal circle can mutually support with the circular shape inlayer sealing washer simultaneously, improves the holistic sealing performance of sealing washer 31.

The following specifically describes the working process of the multi-stage oil cylinder 100 according to the embodiment of the present invention:

as shown in fig. 4 to 6, when the oil holes 60 start to be filled with oil, the piston rod of the first piston assembly and the piston rod of the second piston assembly extend to the bottom step by step, and in the process of extending the piston rods, when the first sealing ring 31 overlaps with the first oil hole, the second sealing ring 31 and the two oil holes can be effectively staggered; when the second seal ring 31 is overlapped with the oil hole 60, the first seal ring 31 and the first oil hole are staggered with each other, so that effective sealing is formed; and finally, when the oil cylinder is completely extended out, the two sealing rings 31 are positioned between the two oil holes 60, so that the multistage oil cylinder 100 is effectively sealed.

To sum up, according to the utility model discloses multistage cylinder 100, through set up a plurality of sealing members 30 on multistage piston assembly 20, make through a plurality of sealing members 30 and have forming effectual sealed system between pole chamber and the rodless chamber, improve the sealing performance between multistage cylinder 100, make in the use of multistage cylinder 100, there is not the phenomenon of direct coincidence between sealing washer 31 and the oilhole 60, thereby there is the risk of internal leakage when avoiding one sealed via hole, increase its use reliability in making the use of multistage cylinder 100.

According to the utility model discloses engineering machine tool, because according to the utility model discloses multistage cylinder 100 of embodiment has above-mentioned technological effect, consequently, according to the utility model discloses engineering machine tool also has above-mentioned technological effect, promptly in the use, can effectively seal the hydro-cylinder, prevents to let out in the hydro-cylinder, improves the holistic stability in use performance of engineering machine tool, and the structure is simple and easy simultaneously, is convenient for production and installation.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A multi-stage cylinder, comprising:

a cylinder defining a chamber therein extending axially therealong, the chamber having an open end;

the piston assembly is arranged along the axial direction of the cavity and comprises a first piston assembly to an Nth piston assembly which are sequentially nested from outside to inside, wherein N is an integer larger than or equal to 2, the first piston assembly is provided with a first rod cavity and a first rodless cavity, the first rod cavity is matched with the first rodless cavity so that a piston rod of the first piston assembly extends out of or retracts into the opening end, the Nth piston assembly is provided with an Nth rod cavity and an Nth rodless cavity, the Nth rod cavity is matched with the Nth rodless cavity so that a piston rod of the Nth piston assembly extends out of or retracts into the opening end, a plurality of oil holes are distributed on the piston rod of the Nth piston assembly at intervals along the axial direction of the piston rod, and each oil hole can enable the Nth rodless cavity to be communicated with an oil path in the Nth-1 rod cavity;

and the sealing elements are arranged on the piston of the Nth piston assembly and are distributed at intervals along the axial direction of the piston.

2. The multi-stage cylinder according to claim 1, wherein the sealing member is a sealing ring sleeved on the piston of the nth piston assembly.

3. The multistage cylinder according to claim 2, wherein the number of the oil holes is two, the number of the seal rings is two, and a minimum distance between the two oil holes is greater than a maximum distance between the two seal rings.

4. The multistage cylinder according to claim 1, wherein an aperture of an end of the oil hole adjacent to the N-1 st rod chamber is larger than an aperture of an end of the oil hole adjacent to the N-1 st rodless chamber.

5. The multi-stage cylinder according to claim 4, wherein the oil hole is a stepped hole.

6. The multi-stage cylinder according to claim 2, wherein the piston of the nth piston assembly is provided with:

the mounting groove is an annular groove extending inwards along the peripheral surface of the piston, and the sealing ring is sleeved in the mounting groove.

7. The multi-stage cylinder according to claim 2, wherein a thickness of the seal ring in an axial direction of the cylinder tube is larger than a radial dimension of an end of the oil hole disposed opposite to the seal ring.

8. The multi-stage cylinder according to claim 2, wherein the seal ring is made of an elastic rubber member.

9. The multi-stage cylinder of claim 8, wherein the seal ring is a gray ring.

10. A working machine comprising a multi-stage cylinder according to any one of claims 1 to 9.

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