CN117605733A - Multistage telescopic erection hydraulic cylinder with core pipe structure - Google Patents
Multistage telescopic erection hydraulic cylinder with core pipe structure Download PDFInfo
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- CN117605733A CN117605733A CN202410085585.5A CN202410085585A CN117605733A CN 117605733 A CN117605733 A CN 117605733A CN 202410085585 A CN202410085585 A CN 202410085585A CN 117605733 A CN117605733 A CN 117605733A
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- 239000003921 oil Substances 0.000 claims abstract description 101
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 10
- 230000009471 action Effects 0.000 abstract description 5
- 238000004891 communication Methods 0.000 abstract description 5
- 230000009172 bursting Effects 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 description 20
- 230000001276 controlling effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000008602 contraction Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Abstract
The invention discloses a multi-stage telescopic erection hydraulic cylinder with a core pipe structure, which relates to the technical field of hydraulic cylinders and comprises the following components: the first oil hole and the second oil hole are arranged on the outer cylinder barrel and are used for providing space for the flow of hydraulic oil inside and outside the outer cylinder barrel; the mounting cavity is arranged in the outer cylinder barrel, and the mounting cavity is connected with a primary piston in a sliding manner. The advantages are that: the hydraulic cylinder can effectively realize multi-stage liquid return communication between the piston rods when in operation, oil holes are not required to be formed in the cylinder wall of the piston rods, the strength of the cylinder barrel is effectively ensured, the cylinder wall is not easy to deform when the hydraulic cylinder bears impact load, the bursting risk is reduced, the thickness of the cylinder wall is not required to be increased for increasing the strength of the cylinder barrel, the structure size of the launching frame is not influenced, in addition, the structure is not only limited to a secondary structure and a tertiary structure, the multi-stage structure can be realized, and meanwhile, the sequential action of the cylinder can be realized by controlling the areas of a rodless cavity and a rod cavity of each stage.
Description
Technical Field
The invention relates to the technical field of hydraulic cylinders, in particular to a core tube structure multi-stage telescopic erection hydraulic cylinder.
Background
In the erection system of the rocket launcher, a multi-stage telescopic erection hydraulic cylinder is a key component, the multi-stage telescopic erection hydraulic cylinder is required to finish erection and leveling of the launcher, and the success or failure of rocket launching can be directly affected.
For the telescopic and erect hydraulic cylinder, vibration and impact are often generated in the two-stage cylinder barrel due to abrupt change of the acting area at the stage changing moment of extension and recovery. Through retrieval, patent document with the Chinese patent application number of CN201710857291.X discloses a multi-stage erection hydraulic cylinder and a buffering method thereof in 2019-03-15, wherein the multi-stage erection hydraulic cylinder comprises a hollow piston rod and a multi-stage cylinder barrel sleeved on the outer side of the piston rod in sequence, the cylinder barrel on the outermost layer is a primary cylinder barrel, and the inner side of the primary cylinder barrel is sleeved with a secondary cylinder barrel.
The multistage erection hydraulic cylinder has the following defects:
1. the oil return communication between the multi-stage piston rods is realized by arranging oil return channels on the primary piston rod and the secondary piston rod, so that the strength of the cylinder barrel is reduced, the cylinder barrel is easy to deform when bearing impact load, and even the risk of bursting exists;
2. on the premise that oil passing channels are formed in the first-stage piston rod and the second-stage piston rod, in order to meet the strength requirement, the thickness of the cylinder wall is required to be increased, the radial size of the oil cylinder is increased, and the structural size of the transmitting frame is directly influenced.
Therefore, a multi-stage telescopic erection hydraulic cylinder with a core tube structure needs to be designed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a multi-stage telescopic erection hydraulic cylinder with a core pipe structure, which solves the problem that the strength of a cylinder barrel is reduced due to the fact that an oil passage is formed in a piston rod in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a multi-stage telescopic erection hydraulic cylinder of a core tube structure, comprising:
the first oil hole and the second oil hole are arranged on the outer cylinder barrel and are used for providing space for the flow of hydraulic oil inside and outside the outer cylinder barrel;
the device comprises an outer cylinder barrel, a first-stage piston, a first-stage rod body, a first oil hole and a second oil hole, wherein the outer cylinder barrel is provided with a mounting cavity in the outer cylinder barrel, the mounting cavity is internally connected with the first-stage piston in a sliding manner, the first-stage rod body is fixedly arranged on the first-stage piston, and the left side wall of the first-stage piston is provided with the first oil hole;
a conveyance regulating section; the conveying and adjusting part is used for conveying the hydraulic oil and adjusting the flow, and comprises an oil conveying tank;
a first-stage guide part; the primary guide part is used for guiding the movement of the primary rod body and comprises a primary guide sleeve;
the first-stage sliding cavity is arranged in the first-stage rod body, a second-stage piston is connected in a sliding manner in the first-stage sliding cavity, a second-stage rod body is fixedly arranged on the second-stage piston, and a second oil through hole is formed in the left side wall of the second-stage piston;
a secondary guide part; the secondary guide part is used for guiding the movement of the secondary rod body and comprises a secondary guide sleeve;
the secondary sliding cavity is arranged in the secondary rod body, a tertiary piston is connected in a sliding manner in the secondary sliding cavity, and a tertiary rod body is fixedly arranged on the tertiary piston;
a three-stage guide part; the three-level guide part is used for guiding the movement of the three-level rod body and comprises a three-level guide sleeve;
a core tube liquid return part; the core pipe liquid return part is used for realizing three-stage liquid return in the hydraulic cylinder, and comprises a first-stage core pipe which is connected with a second-stage piston in a sliding way.
Further, the oil transportation tank is fixedly connected with the outer cylinder through the fixing seat, a first pressure regulating seat is communicated with the first oil hole, a second pressure regulating seat is communicated with the second oil hole, and oil transportation pipes are communicated between the oil transportation tank and the first pressure regulating seat as well as between the oil transportation tank and the second pressure regulating seat.
Further, the right side wall of the primary piston is provided with a primary connecting cavity matched with the primary rod body, the left side wall of the primary connecting cavity is provided with a first groove, the diameter of the first groove is smaller than that of the secondary piston, and the first groove is communicated with the first oil through hole.
Further, the right side wall of the secondary piston is provided with a secondary connecting cavity matched with the secondary rod body, the left side wall of the secondary connecting cavity is provided with a second groove, the diameter of the second groove is smaller than that of the tertiary piston, the second groove is communicated with the second oil through hole, and the right side wall of the tertiary piston is provided with a tertiary connecting cavity matched with the tertiary rod body.
Further, a first connecting cavity is formed at the right side port of the mounting cavity, the primary guide sleeve is fixedly mounted in the first connecting cavity, a primary convex ring is integrally formed on the right side wall of the primary piston, and an alignment ring corresponding to the primary convex ring in position is integrally formed on the side wall of the primary guide sleeve.
Further, a second connecting cavity is formed at the right side port of the first-stage sliding cavity, the second-stage guide sleeve is fixedly arranged in the second connecting cavity, and a second-stage convex ring is integrally formed on the right side wall of the second-stage piston.
Further, a third connecting cavity is formed at the right side port of the second-stage sliding cavity, the third-stage guide sleeve is fixedly arranged in the third connecting cavity, and the right side wall of the third-stage piston is integrally formed with a third-stage convex ring.
Further, a connecting groove matched with the primary core pipe is formed in the side wall of the first groove, a screw hole is formed in the left side wall of the primary piston, a screw plug is arranged in the screw hole, a screw seat matched with the screw plug is integrally formed in the left side of the primary core pipe, and the primary piston is provided with a first oil passing hole which is communicated with the primary core pipe.
Further, a second-stage core pipe is sleeved on the outer wall of the first-stage core pipe in a sliding manner, a sliding groove is formed in the side wall of the third-stage connecting cavity, a second guide seat is fixedly arranged in the sliding groove and is in sliding connection with the second-stage core pipe, an end cover hole II is formed in the side wall of the sliding groove, and an end cover Kong Erna is provided with an end cover II matched with the guide seat;
the side wall of the second groove is provided with a through groove, the through groove is internally and fixedly provided with a first guide seat which is in sliding connection with the primary core pipe, the side wall of the through groove is provided with a first end cover hole, the end cover Kong Yina is provided with a first end cover matched with the first guide seat, and the secondary piston is provided with a second oil passing hole communicated with the secondary core pipe.
Further, the left side wall fixed mounting of outer cylinder has left journal stirrup, rotate on the left journal stirrup and be connected with solid fixed ring one, fixed mounting has right journal stirrup on the right side wall of tertiary body of rod, rotate on the right journal stirrup and be connected with solid fixed ring two.
Compared with the prior art, the invention has the advantages that:
1: when the erection hydraulic cylinder operates, stable expansion and contraction between the multistage piston rods can be orderly realized, an oil hole is not required to be formed in the wall of the piston rod, the wall of the piston rod is not easy to deform when the piston rod bears impact load, the burst risk is reduced, and the multistage liquid return communication among the primary rod body, the secondary rod body and the tertiary can be effectively realized through the design of the core pipe liquid return part.
2: when the erection hydraulic cylinder operates, the movement of the multistage piston rod can be effectively and stably guided, the sealing effect between the multistage piston rods is ensured, and the stable movement and the sealing performance of the primary rod body, the secondary rod body and the tertiary rod body can be ensured through the cooperation of the primary guide part, the secondary guide part and the tertiary guide part.
3: the hydraulic cylinder is free from oil holes on the cylinder wall of the piston rod, so that the strength of the cylinder barrel can be effectively ensured, the thickness of the cylinder wall is free from being increased, and the structural size of the transmitting frame is not affected.
4: the core pipe liquid return part adopted by the erection hydraulic cylinder is not only limited to a secondary structure and a tertiary structure, but also can be realized in a multistage structure, the application range is wider, and the sequential action of the oil cylinder can be realized by controlling the areas of a rodless cavity and a rod cavity of each stage.
In summary, the hydraulic cylinder can effectively realize multi-stage liquid return communication between the piston rods during operation, oil holes are not required to be formed in the cylinder walls of the piston rods, the strength of the cylinder barrel is effectively ensured, the cylinder walls are not easy to deform when the hydraulic cylinder bears impact load, the bursting risk is reduced, the thickness of the cylinder walls is not required to be increased for increasing the strength of the cylinder barrel, the structure size of the launching frame is not influenced, in addition, the structure is not limited to a secondary structure and a tertiary structure, the multi-stage structure can be realized, and meanwhile, sequential action of the cylinder can be realized by controlling the area of each stage of rodless cavity and rod cavity.
Drawings
FIG. 1 is a schematic diagram of a multi-stage telescopic erection hydraulic cylinder with a core tube structure;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a schematic view of the outer cylinder and its upper assembly of FIG. 1;
FIG. 4 is a cross-sectional view of FIG. 3;
FIG. 5 is an exploded view of the structure of FIG. 3;
FIG. 6 is an enlarged exploded view of the primary guide sleeve and its upper assembly of FIG. 5 after being deflected to the right by a certain angle;
FIG. 7 is an enlarged schematic view of the primary rod and its upper assembly shown in FIG. 1;
FIG. 8 is a cross-sectional view of FIG. 7;
FIG. 9 is an exploded view of the structure of FIG. 8;
FIG. 10 is an enlarged exploded view of the secondary guide sleeve and its upper assembly of FIG. 9 after being deflected to the right by a certain angle;
FIG. 11 is an enlarged schematic view of the secondary rod and its upper assembly shown in FIG. 1;
FIG. 12 is a cross-sectional view of FIG. 11;
FIG. 13 is an exploded view of the structure of FIG. 11;
FIG. 14 is an enlarged exploded view of the three-stage guide sleeve and its upper assembly of FIG. 13 after being deflected to the right by a certain angle;
FIG. 15 is an enlarged schematic view of the tertiary lever and its upper assembly of FIG. 1;
FIG. 16 is a cross-sectional view of FIG. 15;
FIG. 17 is an exploded view of the structure of FIG. 15;
FIG. 18 is an enlarged schematic view of the primary piston of FIG. 2;
FIG. 19 is an enlarged schematic view of the secondary piston of FIG. 2;
fig. 20 is an enlarged schematic view of the three stage piston of fig. 2.
In the figure: 1 outer cylinder, 2 mounting cavities, 3 fixing seats, 4 oil delivery tanks, 5 first oil holes, 6 second oil holes, 7 first pressure regulating seats, 8 second pressure regulating seats, 9 oil delivery pipes, 10 first-stage pistons, 11 first-stage connecting cavities, 12 first-stage rod bodies, 13 first oil holes, 14 first grooves, 15 first-stage connecting cavities, 16 first-stage guide sleeves, 17 first-stage convex rings, 18 alignment rings, 19 outer annular grooves, 20 outer seal rings, 21 inner annular grooves, 22 inner seal rings, 23 first-stage sliding cavities, 24 second-stage pistons, 25 second-stage connecting cavities, 26 second-stage rod bodies, 27 second oil holes, 28 second grooves, 29 second-stage connecting cavities, 30 second-stage guide sleeves, 31 second-stage convex rings, 32 inner embedded rings, 33 second outer seal rings, 33 inner annular grooves, 36 inner seal rings the device comprises a 37 second-level sliding cavity, a 38 third-level piston, a 39 third-level connecting cavity, a 40 third-level rod body, a 41 inner hole, a 42 connecting groove, a 43 first-level core tube, a 44 through groove, a 45 sliding groove, a 46 screw hole, a 47 screw plug, a 48 fixing ring II, a 49 screw seat, a 50 oil passing hole I, a 51 second-level core tube, a 52 oil passing hole II, a 53 end cover hole I, a 54 guide seat I, a 55 screw connecting ring I, a 56 end cover I, a 57 guide seat II, a 58 end cover II, a 59 third connecting cavity, a 60 third-level guide sleeve, a 61 third-level convex ring, a 62 connecting ring II, a 63 outer annular groove III, a 64 outer sealing ring III, a 65 inner annular groove III, a 66 inner sealing ring III, a 67 left lug, a 68 inner embedding ring I, a 70 connecting ring I, a 71 fixing ring I, a 72 right supporting lug, a 73 shaft hole II and a 74 embedding groove II.
Detailed Description
Referring to fig. 1 to 17, a multi-stage telescopic erection hydraulic cylinder of a core tube structure includes:
the first oil hole 5 and the second oil hole 6 are formed in the outer cylinder barrel 1, the first oil hole 5 and the second oil hole 6 are used for providing space for hydraulic oil to flow inside and outside the outer cylinder barrel 1, the installation cavity 2 is formed in the outer cylinder barrel 1, and the first oil hole 5 and the second oil hole 6 are communicated with the installation cavity 2;
the conveying and adjusting part is used for conveying hydraulic oil and adjusting flow, the conveying and adjusting part comprises an oil conveying tank 4, the oil conveying tank 4 is fixedly connected with an outer cylinder barrel 1 through a fixed seat 3, a first pressure adjusting seat 7 is communicated with a first oil hole 5, a second pressure adjusting seat 8 is communicated with a second oil hole 6, oil conveying pipes 9 are communicated between the oil conveying tank 4 and the first pressure adjusting seat 7 and between the oil conveying tank 4 and the second pressure adjusting seat 8, the oil conveying tank 4 is an existing tank body used for conveying oil to a hydraulic cylinder and storing the hydraulic oil, the first pressure adjusting seat 7 and the second pressure adjusting seat 8 are all connecting seats internally provided with throttle valves and used for accurately controlling the flow of the hydraulic oil input into the installation cavity 2, the oil conveying tank 4, the first pressure adjusting seat 7 and the second pressure adjusting seat 8 are all existing products, the working principle and specific structure of the hydraulic oil conveying tank are not described herein, and the hydraulic oil can be input into the installation cavity 2 through the first pressure adjusting seat 7 and the second pressure adjusting seat 8 in a specified flow rate when the hydraulic cylinder is operated, and the hydraulic cylinder is used for controlling expansion and contraction;
the installation cavity 2 is internally and slidably connected with a primary piston 10, a primary rod body 12 is fixedly installed on the primary piston 10, a primary connecting cavity 11 matched with the primary rod body 12 is formed in the right side wall of the primary piston 10, the design of the connecting cavity 11 is used for improving the connection stability between the primary piston 10 and the primary rod body 12, a first groove 14 is formed in the left side wall of the primary connecting cavity 11, the diameter of the first groove 14 is smaller than that of a secondary piston 24, a certain space is reserved between the primary piston 10 and the secondary piston 24 due to the design of the first groove 14, a first oil through hole 13 is formed in the left side wall of the primary piston 10, and the first groove 14 is communicated with the first oil through hole 13;
a first-stage sliding cavity 23 arranged in the first-stage rod body 12, a second-stage piston 24 is connected in the first-stage sliding cavity 23 in a sliding way, a second-stage rod body 26 is fixedly arranged on the second-stage piston 24, a second-stage connecting cavity 25 matched with the second-stage rod body 26 is arranged on the right side wall of the second-stage piston 10, a second groove 28 is arranged on the left side wall of the second-stage connecting cavity 25, the diameter of the second groove 28 is smaller than that of the third-stage piston 38, a second oil through hole 27 is arranged on the left side wall of the second-stage piston 24, and the second groove 28 is communicated with the second oil through hole 27;
a secondary sliding cavity 37 arranged in the secondary rod body 26, a tertiary piston 38 is connected in a sliding manner in the secondary sliding cavity 37, a tertiary rod body 40 is fixedly arranged on the tertiary piston 38, and a tertiary connecting cavity 39 matched with the tertiary rod body 40 is arranged on the right side wall of the tertiary piston 38;
through the cooperation of the first oil through hole 13 and the second oil through hole 27, when hydraulic oil is input into the mounting cavity 2 from the first oil through hole 5, the primary piston 10 drives the primary rod body 12, the secondary rod body 26 and the tertiary rod body 40 to extend outwards simultaneously, when the primary rod body 12 moves in place, the hydraulic oil enters the first groove 14 through the first oil through hole 13, then the secondary piston 24 pushes the secondary rod body 26 and the tertiary rod body 40 to extend outwards continuously, and when the secondary rod body 26 moves in place, the hydraulic oil enters the second groove 28 through the second oil through hole 27, so that the tertiary piston 38 pushes the tertiary rod body 40 to extend outwards continuously;
the first-stage guide part is used for guiding the movement of the first-stage rod body 12, and comprises a first-stage guide sleeve 16, a first connecting cavity 15 is formed at the right side port of the mounting cavity 2, the first-stage guide sleeve 16 is fixedly arranged in the first connecting cavity 15, a first-stage convex ring 17 is integrally formed on the right side wall of the first-stage piston 10, an alignment ring 18 corresponding to the position of the first-stage convex ring 17 is integrally formed on the side wall of the first-stage guide sleeve 16, the movement of the first-stage rod body 12 can be stably guided under the cooperation of the first-stage guide sleeve 16, meanwhile, when the first-stage piston 10 moves in place, the first-stage convex ring 17 is in contact with the end face of the alignment ring 18, a space is provided for the flow of hydraulic oil, an external annular groove I19 is formed on the outer wall of the first-stage guide sleeve 16, an external sealing ring I20 is fixedly arranged in the external annular groove I19, an internal annular groove I21 is formed on the inner wall of the first-stage guide sleeve 16, an internal sealing ring I22 is fixedly arranged in the internal annular groove I21, and the sealing effect between the first-stage rod body 12 and the first-stage guide sleeve 16 can be ensured under the cooperation of the external sealing ring I20 and the internal sealing ring I22;
the second-stage guide part is used for guiding the movement of the second-stage rod body 26, and comprises a second-stage guide sleeve 30, a second connecting cavity 29 is formed at the right side port of the first-stage sliding cavity 23, the second-stage guide sleeve 30 is fixedly arranged in the second connecting cavity 29, a second-stage convex ring 31 is integrally formed on the right side wall of the second-stage piston 24, the second-stage convex ring 31 can provide a flow space for conveying and extracting hydraulic oil when the second-stage piston 24 moves in place, an outer annular groove II 33 is formed on the outer wall of the second-stage guide sleeve 30, an outer sealing ring II 34 is fixedly arranged in the outer annular groove II 33, an inner annular groove II 35 is formed on the inner wall of the second-stage guide sleeve 30, an inner sealing ring II 36 is fixedly arranged in the inner annular groove II 35, and effective sealing between the second-stage rod body 26 and the first-stage rod body 12 can be kept under the cooperation of the second-stage guide sleeve 30, the outer sealing ring II 34 and the inner sealing ring II 36;
the third guide part is used for guiding the movement of the third rod body 40, and comprises a third guide sleeve 60, a third connecting cavity 59 is formed at the right side port of the second sliding cavity 37, the third guide sleeve 60 is fixedly arranged in the third connecting cavity 59, a third convex ring 61 is integrally formed on the right side wall of the third piston 38, the third convex ring 61 can also provide a flowing space for conveying and extracting hydraulic oil when the third piston 38 moves in place, an outer annular groove three 63 is formed on the outer wall of the third guide sleeve 60, an outer sealing ring three 64 is fixedly arranged in the outer annular groove three 63, an inner annular groove three 65 is formed on the inner wall of the third guide sleeve 60, an inner sealing ring three 66 is fixedly arranged in the inner annular groove three 65, and the third rod body 40 is enabled to slide and move stably and keep a sealing effect relative to the second rod body 26 under the cooperation of the third guide sleeve 60, the outer sealing ring three 64 and the inner sealing ring three 66;
referring to fig. 1 to 5, 7 to 9, 11 to 13, and 15 to 20, a multi-stage telescopic erection hydraulic cylinder of a core tube structure further includes:
the core tube liquid return part is used for realizing three-stage liquid return in the hydraulic cylinder, the core tube liquid return part comprises a first-stage core tube 43 which is connected to the second-stage piston 24 in a sliding way, a connecting groove 42 matched with the first-stage core tube 43 is formed in the side wall of the first groove 14, a screw hole 46 is formed in the left side wall of the first-stage piston 10, a screw plug 47 is arranged in the screw hole 46, a screw seat 49 matched with the screw plug 47 is integrally formed in the left side of the first-stage core tube 43, and the fixing effect between the first-stage core tube 43 and the first-stage piston 10 can be ensured through the cooperation of the screw seat 49 and the screw plug 47;
the side wall of the second groove 28 is provided with a through groove 44, a guide seat I54 which is in sliding connection with the primary core pipe 43 is fixedly arranged in the through groove 44, the side wall of the through groove 44 is provided with an end cover hole I53, the end cover I53 is internally provided with an end cover I56 which is matched with the guide seat I54, the side wall of the guide seat I54 is provided with a threaded connecting groove I, the threaded connecting groove I is internally and spirally connected with a threaded connecting ring I55, the threaded connecting ring I55 is fixedly connected with the end cover I56, and under the design of the guide seat I54, the connection tightness between the two pistons 24 can be ensured when sliding relative to the primary core pipe 43;
the outer wall sliding sleeve of the primary core tube 43 is provided with a secondary core tube 51, the right side of the first guide seat 54 is fixedly connected with the left side of the secondary core tube 51, the side wall of the tertiary connecting cavity 39 is provided with a sliding groove 45, the sliding groove 45 is internally fixedly provided with a second guide seat 57, the second guide seat 57 is in sliding connection with the secondary core tube 51, the side wall of the sliding groove 45 is provided with a second end cover hole, the end cover Kong Erna is provided with a second end cover 58 matched with the second guide seat 57, the side wall of the second guide seat 57 is provided with a second threaded connecting groove, the second threaded connecting groove is internally and in threaded connection with a second threaded connecting ring, the second threaded connecting ring is fixedly connected with the second end cover 57, and the second guide seat 57 and the first guide seat 54 are matched, so that the secondary core tube 24 can stably move relative to the tertiary piston 38 and ensure the tightness between the second core tube 24 and the second piston 24, and the fixing effect between the first core tube 43 and the second core tube 51 are in sliding sealing connection;
the three-stage rod body 40 is provided with an inner hole 41, the inner hole 41 is in sliding connection with the second-stage core tube 51, the first-stage piston 10 is provided with an oil passing hole I50, the oil passing hole I50 is communicated with the first-stage core tube 43, the second-stage piston 24 is provided with an oil passing hole II 52 communicated with the second-stage core tube 51, the first oil passing hole 13 and the second oil passing hole 27 both play a role in communicating an oil way without a rod cavity, and the oil passing hole I50 and the oil passing hole II 52 both play a role in communicating an oil way with a rod cavity;
under the cooperation of the first oil passing hole 50 and the second oil passing hole 52, multistage liquid return communication between piston rods can be effectively realized, oil passing holes are not required to be formed in the cylinder walls of the piston rods, the strength of the cylinder barrel is effectively ensured, deformation of the cylinder walls is not easy to occur when the cylinder barrel bears impact load, the bursting risk is reduced, the thickness of the cylinder walls is not required to be increased for increasing the strength of the cylinder barrel, the structure size of the launching frame is not influenced, in addition, the structure is not limited to a secondary structure and a tertiary structure, the multistage structure can be realized, and meanwhile, the sequential action of the oil cylinders can be realized by controlling the areas of a rodless cavity and a rod cavity of each stage under the condition that the flow rate of hydraulic oil input is unchanged;
the left side wall of the outer cylinder barrel 1 is fixedly provided with a left support lug 67, the left support lug 67 is rotationally connected with a first fixing ring 71, the left support lug 67 is provided with a first shaft hole, the side wall of the first shaft hole is provided with a first embedded groove 68, the first embedded groove 68 is rotationally connected with a first embedded ring 69, and a first connecting ring 70 is fixedly arranged between the first embedded ring 69 and the first fixing ring 71;
the right side wall of the three-stage rod body 40 is fixedly provided with a right support lug 72, the right support lug 72 is rotationally connected with a second fixing ring 48, the right support lug 72 is provided with a second shaft hole 73, the side wall of the second shaft hole 73 is provided with a second embedded groove 74, the second embedded groove 74 is rotationally connected with a second embedded ring 32, and a second connecting ring 62 is fixedly arranged between the second embedded ring 32 and the second fixing ring 48.
The invention discloses a working principle of a core tube structure multistage telescopic erection hydraulic cylinder, which comprises the following steps:
the hydraulic oil is input into the installation cavity 2 through the first oil hole 5, the primary piston 10 drives the primary rod body 12, the secondary rod body 26 and the tertiary rod body 40 to extend outwards simultaneously in an initial input stage, when the primary rod body 12 moves in place, the primary convex ring 17 on the primary piston 10 is in contact with the end face of the alignment ring 18 on the primary guide sleeve 16, at the moment, the primary piston 10 stops running, the hydraulic oil enters the first groove 14 through the first oil hole 13, then the secondary piston 24 pushes the secondary rod body 26 and the tertiary rod body 40 to extend outwards continuously, and when the secondary rod body 26 moves in place, the hydraulic oil enters the second groove 28 through the second oil hole 27, so that the tertiary piston 38 pushes the tertiary rod body 40 to extend outwards continuously;
when the hydraulic cylinder is required to be contracted, hydraulic oil is input into the installation cavity 2 through the second oil hole 6, the hydraulic oil on the left side of the installation cavity 2 is pumped back through the first oil hole 5, at the moment, the oil pressure in the rod cavity is increased under the action of the hydraulic oil input by the second oil hole 6, so that the pressure difference is generated between the rod cavity and the rodless cavity, the three-stage rod body 40 is reset in advance under the cooperation of the first-stage core tube 43 and the second-stage core tube 51, the second-stage rod body 26 is reset under the cooperation of the second oil hole 52 and the second-stage core tube 51, and the reset of the last-stage rod body 10 is completed again, so that the whole telescopic process is orderly carried out.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a multistage flexible erection pneumatic cylinder of core tube structure which characterized in that includes:
the first oil hole (5) and the second oil hole (6) are formed in the outer cylinder (1), and the first oil hole (5) and the second oil hole (6) are used for providing space for hydraulic oil to flow inside and outside the outer cylinder (1);
the device comprises an installation cavity (2) arranged in an outer cylinder (1), wherein a primary piston (10) is connected in a sliding manner in the installation cavity (2), a primary rod body (12) is fixedly arranged on the primary piston (10), and a first oil through hole (13) is formed in the left side wall of the primary piston (10);
a conveyance regulating section; the conveying and adjusting part is used for conveying and adjusting the flow of the hydraulic oil and comprises an oil conveying tank (4);
a first-stage guide part; the primary guide part is used for guiding the movement of the primary rod body (12), and comprises a primary guide sleeve (16);
a first-stage sliding cavity (23) arranged in the first-stage rod body (12), a second-stage piston (24) is connected in the first-stage sliding cavity (23) in a sliding manner, a second-stage rod body (26) is fixedly arranged on the second-stage piston (24), and a second oil through hole (27) is formed in the left side wall of the second-stage piston (24);
a secondary guide part; the secondary guide part is used for guiding the movement of the secondary rod body (26), and comprises a secondary guide sleeve (30);
a secondary sliding cavity (37) arranged in the secondary rod body (26), wherein a tertiary piston (38) is connected in a sliding manner in the secondary sliding cavity (37), and a tertiary rod body (40) is fixedly arranged on the tertiary piston (38);
a three-stage guide part; the three-stage guide part is used for guiding the movement of the three-stage rod body (40), and comprises a three-stage guide sleeve (60);
a core tube liquid return part; the core tube liquid return part is used for realizing three-stage liquid return in the hydraulic cylinder and comprises a first-stage core tube (43) which is connected to the second-stage piston (24) in a sliding way.
2. The multi-stage telescopic erection hydraulic cylinder with the core tube structure according to claim 1, wherein the oil delivery tank (4) is fixedly connected with the outer cylinder (1) through a fixed seat (3), a first pressure regulating seat (7) is communicated with the first oil hole (5), a second pressure regulating seat (8) is communicated with the second oil hole (6), and oil delivery pipes (9) are respectively communicated between the oil delivery tank (4) and the first pressure regulating seat (7) and between the oil delivery tank and the second pressure regulating seat (8).
3. The multi-stage telescopic erection hydraulic cylinder with the core tube structure according to claim 1, wherein a first-stage connecting cavity (11) matched with a first-stage rod body (12) is formed in the right side wall of the first-stage piston (10), a first groove (14) is formed in the left side wall of the first-stage connecting cavity (11), the diameter of the first groove (14) is smaller than that of the second-stage piston (24), and the first groove (14) is communicated with the first oil through hole (13).
4. A multistage flexible erection pneumatic cylinder of core tube structure according to claim 3, characterized in that, second connecting chamber (25) with second pole body (26) matched with is seted up to the right side wall of second pole (10), second recess (28) have been seted up to the left side wall of second connecting chamber (25), and the diameter of second recess (28) is less than the diameter of tertiary piston (38), second recess (28) and second oil through hole (27) intercommunication, tertiary connecting chamber (39) with tertiary pole body (40) matched with is seted up to the right side wall of tertiary piston (38).
5. The multi-stage telescopic erection hydraulic cylinder with the core tube structure according to claim 1, wherein a first connecting cavity (15) is formed at a right side port of the mounting cavity (2), the primary guide sleeve (16) is fixedly mounted in the first connecting cavity (15), a primary convex ring (17) is integrally formed on the right side wall of the primary piston (10), and an alignment ring (18) corresponding to the primary convex ring (17) in position is integrally formed on the side wall of the primary guide sleeve (16).
6. The multi-stage telescopic erection hydraulic cylinder with the core tube structure according to claim 1, wherein a second connecting cavity (29) is formed at a right side port of the first-stage sliding cavity (23), the second-stage guide sleeve (30) is fixedly arranged in the second connecting cavity (29), and a second-stage convex ring (31) is integrally formed on the right side wall of the second-stage piston (24).
7. The multi-stage telescopic erection hydraulic cylinder with the core tube structure according to claim 1, wherein a third connecting cavity (59) is formed at a right side port of the secondary sliding cavity (37), the tertiary guide sleeve (60) is fixedly arranged in the third connecting cavity (59), and a tertiary convex ring (61) is integrally formed on the right side wall of the tertiary piston (38).
8. The multi-stage telescopic erection hydraulic cylinder with the core tube structure according to claim 4, wherein a connecting groove (42) matched with a primary core tube (43) is formed in the side wall of the first groove (14), a screw hole (46) is formed in the left side wall of the primary piston (10), a screw plug (47) is arranged in the screw hole (46), a screw seat (49) matched with the screw plug (47) is integrally formed in the left side of the primary core tube (43), an oil passing hole I (50) is formed in the primary piston (10), and the oil passing hole I (50) is communicated with the primary core tube (43).
9. The multi-stage telescopic erection hydraulic cylinder with the core pipe structure according to claim 8, wherein a second-stage core pipe (51) is sleeved on the outer wall of the first-stage core pipe (43) in a sliding manner, a sliding groove (45) is formed in the side wall of the third-stage connecting cavity (39), a second guide seat (57) is fixedly arranged in the sliding groove (45), the second guide seat (57) is in sliding connection with the second-stage core pipe (51), an end cover hole II is formed in the side wall of the sliding groove (45), and an end cover II (58) matched with the second guide seat (57) is arranged on the end cover Kong Erna;
the side wall of the second groove (28) is provided with a through groove (44), a first guide seat (54) which is in sliding connection with the first-stage core tube (43) is fixedly arranged in the through groove (44), the side wall of the through groove (44) is provided with a first end cover hole (53), the first end cover hole (53) is internally provided with a first end cover (56) which is matched with the first guide seat (54), and the second piston (24) is provided with a second oil passing hole (52) which is communicated with the second-stage core tube (51).
10. The multi-stage telescopic erection hydraulic cylinder with the core tube structure according to claim 1, wherein a left support lug (67) is fixedly arranged on the left side wall of the outer cylinder (1), a first fixing ring (71) is rotationally connected to the left support lug (67), a second fixing ring (72) is fixedly arranged on the right side wall of the three-stage rod body (40), and a second fixing ring (77) is rotationally connected to the right support lug (72).
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