CN111608987A

CN111608987A - Main jacking oil cylinder

Info

Publication number: CN111608987A
Application number: CN202010371585.3A
Authority: CN
Inventors: 杨雪松; 胡成
Original assignee: Yangzhou Earth Dragon Machinery Co ltd
Current assignee: Yangzhou Earth Dragon Machinery Co ltd
Priority date: 2020-05-06
Filing date: 2020-05-06
Publication date: 2020-09-01

Abstract

The invention provides a main top oil cylinder, which relates to the technical field of hydraulic pressure and comprises a cylinder body, wherein a tail cover is arranged at the bottom end of the cylinder body, a core column is coaxially arranged in the cylinder body, a primary inner cylinder sleeve and a secondary inner cylinder sleeve are sequentially sleeved outside the core column, and a ball head is further arranged at the top end of the core column. According to the main jacking oil cylinder, the oil ways are connected in series among the cylinder sleeves in the oil cylinder, so that the main jacking oil cylinder is easy to manufacture and disassemble, and can adapt to application environments with narrow space, compact structure and limitation on the stroke and the installation distance.

Description

Main jacking oil cylinder

Technical Field

The invention relates to the technical field of hydraulic pressure, in particular to a main jacking oil cylinder.

Background

The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has simple structure and reliable operation. When it is used to implement reciprocating movement, it can remove speed-reducing device, and has no transmission gap, and its movement is stable, and the hydraulic oil cylinder is used as a power device, so that it can be extensively used in hydraulic systems of various machines.

The action principle of the hydraulic oil avoiding cylinder is as follows: the effective acting area (mm2) of the piston is the pressure (MPa) of the hydraulic medium, namely the output force (N) of the oil cylinder, and when the output force of the oil cylinder is larger than the load force, the piston rod extends out; when the output force of the oil cylinder is smaller than the load force, the piston rod is static; when the multistage hydraulic cylinder works, because the load force is constant, the effective action areas of pistons at each stage are different, so that piston rods extend out, the pressure of a hydraulic system required by each stage of action is also different, the effective action area of the piston at the first stage is the largest, the piston rod can extend out when the pressure of the hydraulic system is lower, the effective action area of the piston at the smallest stage is the smallest, and the piston rod can extend out only when the pressure of the hydraulic system is the largest; when the hydraulic system works, the pressure is gradually increased from low to high, so that the extension sequence of the multi-stage hydraulic oil cylinder is first-stage first-out, second-stage second-order and the smallest stage extends last; due to the structural characteristics of the multistage hydraulic oil cylinder, the area ratio of a rodless cavity to a rod cavity of the multistage hydraulic oil cylinder is usually 5-8, and the area ratio of the rodless cavity to the rod cavity of the multistage hydraulic oil cylinder is even more than 10 in some cases; if the multistage hydraulic cylinder can not sequentially discharge the piston rods, when the next stage piston passes through the rod cavity oil return hole of the previous stage, the rod cavity oil return channel of the previous stage is blocked, so that the oil liquid in the rod cavity of the previous stage can not be discharged, at the moment, because of the force balance principle, the output force of the rod cavity side and the output force of the rodless cavity side are different, the oil pressure is different because of the different area ratios of the two cavities, and the area ratio is the pressurization ratio, the cylinder expansion condition is caused, the hydraulic cylinder is scrapped, and the multistage hydraulic cylinder is damaged because of the pressurization generated by messy cylinders, therefore, the multistage hydraulic cylinder which has the advantages of simple structure, difficult deformation and cylinder expansion prevention is necessary.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a main jacking oil cylinder.

In order to achieve the above objects and other related objects, the present invention provides the following technical solutions: a main jacking cylinder is characterized by comprising:

the core column comprises an inner core and an outer core, the inner core and the outer core are both cylindrical structures, the inner diameter of the outer core is larger than the outer diameter of the inner core, the outer core is sleeved on the inner core, the inner wall of the top end of the outer core is fixedly connected with the outer wall of the top end of the inner core through a connecting part, a first oil path communicated with the head and the tail is arranged in the inner core, a first oil hole is formed in the outer core, an annular oil groove is formed between the outer wall of the inner core and the inner wall of the outer core, and the first oil hole and the annular oil groove form a second oil path;

the ball head is positioned at the top end of the core column, a first piston ring is fixedly and hermetically mounted at one end of the ball head close to the core column, and the inner wall of the first piston ring is in sliding connection with the outer wall of the upper section of the outer core;

the primary inner cylinder sleeve is sleeved on the periphery of the core column, the inner wall of the upper end of the primary inner cylinder sleeve is in sliding connection with the outer wall of the first piston ring, the inner wall of the lower end of the primary inner cylinder sleeve is fixedly and hermetically provided with a second piston ring, and the inner wall of the second piston ring is in sliding connection with the outer wall of the lower section of the outer core;

the second-stage inner cylinder sleeve is sleeved on the periphery of the first-stage inner cylinder sleeve, the inner wall of the second-stage inner cylinder sleeve is in sliding connection with the outer wall of the first-stage inner cylinder sleeve, the outer wall of the second-stage inner cylinder sleeve comprises a first outer wall section and a second outer wall section, the outer diameter of the first outer wall section is smaller than that of the second outer wall section, and a second oil hole which is communicated with the first outer wall section and the inner wall of the second-stage inner cylinder sleeve is formed in the second-stage inner cylinder sleeve at the joint of the first outer wall section and the second outer wall section;

the bottom sleeve is fixedly and hermetically arranged on the inner wall of the bottom end of the secondary inner cylinder sleeve, the inner wall of the bottom sleeve is sleeved on the outer wall of the inner core, an annular stepped groove is formed in the top end of the bottom sleeve and comprises a first groove part, a second groove part and a third groove part which are diffused outwards from the middle and become shallow in sequence, the second groove part is matched and abutted with the bottom end of the outer core, the second oil way is communicated with the first groove part, a third oil hole communicated with the first groove part and the outer wall of the bottom sleeve is formed in the bottom sleeve, the third oil hole corresponds to the second oil hole in position and forms a third oil way, and a fourth oil hole communicated with the top end and the bottom end of the bottom sleeve is further formed in the bottom sleeve;

the cylinder body is sleeved on the periphery of the secondary inner cylinder sleeve, the inner wall of the cylinder body comprises a first inner wall section and a second inner wall section, the first inner wall section is in sliding connection with the first outer wall section, the second inner wall section is in sliding connection with the second outer wall section, and a tail cover is fixedly and hermetically mounted at the bottom end of the cylinder body;

in a sleeve cavity formed by the outer core and the primary inner cylinder sleeve, the top end of the second piston ring and the bottom end of the first piston ring form a first oil cavity, in a sleeve cavity formed by the secondary inner cylinder sleeve and the outer core, the bottom end of the second piston ring and the top end of the bottom sleeve form a second oil cavity, the inner wall of the cylinder body and the outer wall of the secondary inner cylinder sleeve form a third oil cavity, a fourth oil cavity is formed between the bottom sleeve and the tail cover, and a fifth oil cavity is formed between the ball head and the core column and between the first piston ring and the core column;

the first oil path is communicated with the fourth oil chamber and the fifth oil chamber, the second oil path and the third oil path are communicated with the first oil chamber and the third oil chamber, and the fourth oil hole is communicated with the second oil chamber and the fourth oil chamber;

and a first oil nozzle and a second oil nozzle are arranged on the cylinder body, the first oil nozzle is communicated with the fourth oil cavity, and the second oil nozzle is communicated with the third oil cavity.

Due to the application of the technical scheme, the invention has the beneficial effects that:

the main jacking oil cylinder provided by the invention adopts a mode of connecting oil ways in series, so that the product is easy to manufacture and disassemble, and can adapt to an application environment with narrow space, compact structure and limited stroke and installation distance.

Drawings

FIG. 1 is a cross-sectional view of the present invention in a compressed state.

In the above figures, 1, an inner core; 2. an outer core; 3. a connecting portion; 4. a first oil passage; 5. a first oil hole; 6. an annular oil groove; 7. a ball head; 8. a first piston ring; 9. a primary inner cylinder liner; 10. a second piston ring; 11. a first outer wall section; 12. a second outer wall section; 13. a second oil hole; 14. a bottom cover; 15. a first groove portion; 16. a second groove portion; 17. a third groove portion; 18. a third oil hole; 19. a fourth oil hole; 20. a secondary inner cylinder sleeve; 21. a first inner wall section; 22. a second inner wall section; 23. a tail cover; 24. a first oil chamber; 25. a second oil chamber; 26. a third oil chamber; 27. a fourth oil chamber; 28. a fifth oil chamber; 29. a first oil nipple; 30. a second oil nozzle; 31. a cylinder body.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

Please refer to fig. 1. It should be understood that in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which the product of the present invention is usually placed in when used, which is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. The terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should be further noted that, unless otherwise specifically stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, and a communication between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

as shown in fig. 1, a master ram. The cylinder comprises a cylinder body 31, wherein a core column, a primary inner cylinder sleeve 9, a secondary inner cylinder sleeve 20 and a bottom sleeve 14 are coaxially arranged in the cylinder body 31.

Wherein, the stem includes inner core 1 and outer core 2, and inner core 1 and outer core 2 are cylindric structure, and the internal diameter of outer core 2 is greater than the external diameter of inner core 1, and the length of outer core 2 is less than the length of inner core 1, and outer core 2 is located the periphery of inner core 1 and the top inner wall of outer core 2 and the top outer wall of inner core 1 passes through connecting portion 3 fixed sealing connection. A first oil path 4 communicated with the head end and the tail end is arranged in the inner core 1. A first oil hole 5 is formed in the outer core 2, and the first oil hole 5 and an annular oil groove 6 formed between the outer core 2 and the inner core 1 jointly form a second oil path for communicating the outer wall of the outer core 2 and the bottom end of the outer core 2.

The cylinder liner 9 in the one-level is equipped with to the peripheral cover of stem, and fixed seal installs second piston ring 10 on the bottom inner wall of cylinder liner 9 in the one-level, and the inner wall of second piston ring 10 and the hypomere outer wall sliding connection of outer core 2. Be provided with first piston ring 8 between the top inner wall of cylinder liner 9 in the one-level and the upper segment outer wall of outer core 2, the inner wall sliding connection of cylinder liner 9 in the outer wall of first piston ring 8 and the one-level, the inner wall of first piston ring 8 and the outer wall sliding connection of outer core 2. The top end of the first piston ring 8 is fixedly and hermetically provided with a ball head 7. The ball head 7 is provided with a limiting part (not shown in the figure), and the limiting part is abutted against the top end of the first-stage inner cylinder sleeve 9.

The periphery of the first-stage inner cylinder sleeve 9 is sleeved with a second-stage inner cylinder sleeve 20, and the inner wall of the second-stage inner cylinder sleeve 20 is connected with the outer wall of the first-stage inner cylinder sleeve 9 in a sliding mode. The outer wall of the second-stage inner cylinder sleeve 20 comprises a first outer wall section 11 and a second outer wall section 12, the outer diameter of the first outer wall section 11 is smaller than that of the second outer wall section 12, and a second oil hole 13 which is communicated with the outer wall of the first outer wall section 11 and the inner wall of the second-stage inner cylinder sleeve 9 is formed in the second-stage inner cylinder sleeve 9 at the joint of the first outer wall section 11 and the second outer wall section 12.

And a bottom sleeve 14 is fixedly and hermetically arranged on the inner wall of the bottom end of the secondary inner cylinder sleeve 9. The end cover 14 is cylindric structure, and central point puts and is provided with the through-hole that is used for inserting the inner core 1, is provided with cyclic annular ladder groove on the top of end cover 14, and cyclic annular ladder groove includes from inside to outside and from first slot portion 15, second slot portion 16 and the third slot portion 17 of depth shallowness. Two oil holes are arranged in the bottom sleeve 14, wherein one oil hole is a third oil hole 18 for communicating the first groove part 15 with the outer wall of the bottom sleeve 14, and the third oil hole 18 and the second oil hole 13 correspondingly form a third oil path. The other oil hole is a fourth oil hole 19 communicating the top end and the bottom end of the bottom sleeve 14. In the mounting state, the inner core 1 of the core column is inserted into the through hole at the center of the bottom sleeve 14, the bottom end of the outer core 2 is matched and abutted with the second groove part 16, and the second oil path is communicated with the first groove part 15.

The cylinder body 31 is sleeved on the periphery of the second-stage inner cylinder sleeve 20, and the inner wall of the cylinder body 31 comprises a first inner wall section 21 in sliding connection with the first outer wall section 11 and a second inner wall section 22 in sliding connection with the second outer wall section 12. The tail cover 23 is fixedly and hermetically mounted at the bottom end of the cylinder body 31.

Further, in the jacket cavity formed by the outer core 2 and the primary inner cylinder liner 9, the top end of the second piston ring 10 and the bottom end of the first piston ring 8 form a first oil chamber 24. In the sleeve cavity formed by the secondary inner cylinder sleeve 20 and the outer core 2, the bottom end of the second piston ring 10 and the top end of the bottom sleeve 14 form a second oil chamber 25. A third oil chamber 26 is formed between the outer wall of the secondary inner cylinder liner 20 and the inner wall of the cylinder block 31. A fourth oil chamber 27 is formed between the bottom cover 14 and the tail cover 23. A fifth oil chamber 28 is formed between the ball head 7 and the first piston ring 8 and the top end of the core column.

After the mounting is completed, the first oil passage 4 communicates with the fourth oil chamber 27 and the fifth oil chamber 28, the second oil passage and the third oil passage communicate with the first oil chamber 24 and the third oil chamber 26, and the fourth oil hole 19 communicates with the second oil chamber 25 and the fourth oil chamber 27.

Further, a first oil nipple 29 and a second oil nipple 30 are provided on the cylinder block 31, the first oil nipple 29 and the fourth oil chamber 27 communicate, and the second oil nipple 30 and the third oil chamber 26 communicate.

It should be noted that: the bottom of the first piston ring 8 is provided with an oil groove to avoid blocking the first oil hole 5. In the mounted state of the second piston ring 10, the bottom end thereof and the bottom end of the first-stage inner cylinder liner 9 constitute oil grooves to prevent the fourth oil holes 19 from being blocked. Further, the third oil chamber 26, the fourth oil chamber 27, and the fifth oil chamber 28 do not block the corresponding oil holes in the limit state of compression, to prevent the oil passages from being blocked.

The working principle is as follows:

when the oil cylinder is in a compression process, the effective acting area of the bottom surface of the bottom sleeve 14 is the largest, the bottom sleeve 14 and the secondary inner cylinder sleeve 20 are fixedly and hermetically mounted, so that the secondary inner cylinder sleeve 20 is driven to push inwards to the bottommost end together with the bottom sleeve, and hydraulic oil in the fourth oil chamber 27 is discharged from the first oil nozzle 29. The effective action area of the bottom surface of the second piston ring 10 is the second, the second piston ring 10 and the first-stage inner cylinder sleeve 9 are fixedly and hermetically mounted, so that the first-stage inner cylinder sleeve 9 is driven to be pushed to the bottommost end, and the hydraulic oil in the second oil chamber 25 is discharged into a gap between the tail cover 23 and the bottom sleeve 14 from the fourth oil hole 19 and then discharged by the first oil nozzle 29. The effective acting area of the inner side of the ball head 7 is the smallest, and finally, the ball head 7 is pressed down, and the hydraulic oil in the fifth oil chamber 28 is discharged into the gap between the tail cover 23 and the bottom sleeve 14 from the first oil path 4 and then is discharged by the first oil nozzle 29. In this process, the first oil chamber 24 and the third oil chamber 26 become large, and the hydraulic oil enters the third oil chamber 26 and the first oil chamber 24 through the second oil nipple 30. In this state, the first oil chamber 24 and the third oil chamber 26 are filled with hydraulic oil, and the second oil chamber 25, the fourth oil chamber 27, and the fifth oil chamber 28 are not filled with hydraulic oil.

When the oil cylinder is in an extending process, hydraulic oil is filled into the fourth oil cavity 27 from the first oil nozzle 29, and internal pressure is formed, because the effective acting area of the bottom surface of the bottom sleeve 14 is the largest, the bottom sleeve 14 and the secondary inner cylinder sleeve 20 fixedly and hermetically mounted with the bottom sleeve are firstly pushed to the outermost side by the internal pressure. The bottom surface of the second piston ring 10 has the second effective acting area, the internal pressure pushes the hydraulic oil from the first oil hole 19 into the second oil chamber 25, and the internal pressure is formed to push the first-stage inner cylinder sleeve 9 to the outermost side. Finally, the hydraulic oil is squeezed into the fifth oil chamber 28 by the internal pressure, and the ball head 7 is pushed to the outermost side by the internal pressure. In the process, the hydraulic oil in the first oil chamber 24 is pushed by the second piston ring 10 to be squeezed into the third oil chamber 26 along the second oil path and the third oil path and discharged through the second oil nozzle 30; the hydraulic oil in the third oil chamber 26 is pushed by the second-stage inner cylinder liner 20 and is also discharged through the second oil nozzle 30. In this state, the first oil chamber 24 and the third oil chamber 26 are not filled with hydraulic oil, and the second oil chamber 25, the fourth oil chamber 27, and the fifth oil chamber 28 are filled with hydraulic oil.

Therefore, the invention has the following advantages:

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A main jacking cylinder is characterized by comprising: