CN114017414B - Hydraulic cylinder self-adaptive sealing device and self-adaptive adjusting method - Google Patents
Hydraulic cylinder self-adaptive sealing device and self-adaptive adjusting method Download PDFInfo
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- CN114017414B CN114017414B CN202111282649.3A CN202111282649A CN114017414B CN 114017414 B CN114017414 B CN 114017414B CN 202111282649 A CN202111282649 A CN 202111282649A CN 114017414 B CN114017414 B CN 114017414B
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- 238000007789 sealing Methods 0.000 title claims abstract description 154
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000001125 extrusion Methods 0.000 claims description 15
- 238000005299 abrasion Methods 0.000 claims description 7
- 230000003044 adaptive effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 29
- 238000009530 blood pressure measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000013016 damping Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 210000005056 cell body Anatomy 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1438—Cylinder to end cap assemblies
- F15B15/1442—End cap sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sealing Devices (AREA)
Abstract
The invention provides a self-adaptive sealing device and a self-adaptive finishing method for a hydraulic cylinder, wherein an upper end cover and a lower end cover are arranged at two ends of a cylinder body, a piston assembly is arranged in the cylinder body, a piston rod penetrates through the lower end cover and is in sliding sealing connection with the lower end cover, a sealing end cover is further arranged at one end of the lower end cover, a closed cavity is formed between the lower end cover and the sealing end cover, a piston seal is arranged in the closed cavity between the sealing end cover and the lower end cover, a combined seal is arranged between the piston seal and the lower end cover, the piston seal abuts against one end of the combined seal, and an adjusting device is further arranged for pushing the piston seal to extrude the combined seal so as to adjust a combined seal gap of the combined seal. The detection device controls the pressurizing device according to the measured conveying, and the adjusting device pushes the piston to move left so as to adjust the V-shaped combined sealing gap.
Description
Technical Field
The invention relates to the field of hydraulic sealing, in particular to a self-adaptive sealing device and a self-adaptive adjusting method for a hydraulic cylinder.
Background
In engineering technology, a hydraulic cylinder is used as an actuator, a piston rod or a cylinder tube of the hydraulic cylinder reciprocates to transmit an acting force, and a V-shaped combined seal, a Y-shaped combined seal, a gurley ring, an O-ring or the like is generally used for sealing between moving members. However, due to the characteristics of the sealing structure of the sealing member and the existence of working conditions such as wear resistance of materials, doping impurities of hydraulic oil, unbalanced load and the like, the abrasion of the dynamic sealing member of the hydraulic cylinder is increased, and a sealing gap is generated, so that the hydraulic oil leaks.
At present, related researches are also carried out on the self-adaptive technology of dynamic sealing of the hydraulic cylinder, firstly, pressure oil is enabled to enter the bottom of the sealing groove by utilizing the diversion trench, the effect of extruding a sealing piece is achieved, and the purpose of adjusting a sealing gap is achieved, such as a self-sealing double-acting hydraulic cylinder of a type of CN201310542667. X; secondly, a nested sealing structure is adopted, and pressure oil is introduced to deform the plastic sleeve to squeeze the sealing element, so that the aim of adjusting a sealing gap is fulfilled, for example, a self-adaptive sealing device for a hydraulic cylinder piston is disclosed as CN 201210398184.2; thirdly, design elastic damping ring, adjust the rate of tension through the oil pressure, reach the purpose of adjusting sealing member clearance.
In summary, the following problems exist in the existing hydraulic cylinder self-adaptive sealing technical scheme: firstly, the scheme of directly extruding the sealing element by using pressure oil to adjust the gap is only suitable for special sealing such as U-shaped sealing, and the extrusion force of the sealing element is constant and cannot be adjusted, so that the movement friction force is overlarge; secondly, the scheme that the gap is adjusted by extruding the sealing element by means of the compression deformation of other parts is realized, the deformation element is complex in compression deformation, the deformation amount is not easy to control, and therefore the sealing element is unevenly extruded, and the sealing effect is affected.
The Chinese patent CN 107605855A is a V-shaped combined sealing structure in a plunger type oil cylinder, and comprises a plunger, a guide belt, a pressing ring and a cylinder opening guide sleeve; the structure also comprises a V-shaped cloth-clamping rubber combined sealing ring, and the guide belt is closely adjacent to the lip surface and the back surface of the V-shaped cloth-clamping rubber combined sealing ring; a pressing ring is additionally arranged on the cylinder port guide sleeve; the clearance between the plunger and the cylinder opening guide sleeve is 1-2mm. The scheme of adjusting the clearance is achieved by pressing, deforming and extruding the sealing element by other parts, the deformation element is complex in pressing deformation, and the deformation amount is not easy to control, so that the sealing element is unevenly extruded, and the sealing effect is affected.
The Chinese patent CN 211423068U is a sealing protection structure for prolonging the service life of an oil cylinder, which comprises a piston rod, an oil cylinder cover and a cap, wherein the oil cylinder cover and the cap are sleeved on the piston rod; the oil cylinder cover is internally provided with a step hole, and the cap is embedded into the step hole and is in sliding fit with the step hole; the bottom surface of the step hole is provided with a plurality of threaded holes, and the cap is provided with through holes corresponding to the threaded holes. The scheme of adjusting the clearance is achieved by pressing, deforming and extruding the sealing element by other parts, the deformation element is complex in pressing deformation, and the deformation amount is not easy to control, so that the sealing element is unevenly extruded, and the sealing effect is affected.
Disclosure of Invention
The invention mainly aims to provide a self-adaptive sealing device and a self-adaptive adjusting method for a hydraulic cylinder, and aims to provide the self-adaptive dynamic sealing device for the hydraulic cylinder, which can monitor sealing leakage in real time, automatically adjust the extrusion force of a sealing element and adjust a sealing gap.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a pneumatic cylinder self-adaptation sealing device, cylinder body both ends are equipped with upper end cover and lower end cover, piston assembly establishes inside the cylinder body, the piston rod passes the lower end cover and with lower end cover sliding seal connection, lower end cover one end still is equipped with the seal end cover, form airtight cavity between lower end cover and the seal end cover, airtight cavity inside between seal end cover and the lower end cover is equipped with the piston seal, be equipped with the combination seal between piston seal and the lower end cover, the piston seal supports and leans on combination seal one end, still be equipped with adjusting device, adjusting device is used for promoting the sealed extrusion combination seal of piston, with the sealed combination seal clearance of adjustment combination.
In the preferred scheme, the adjusting device is a self-adaptive adjusting device, and the structure is as follows: a cavity is arranged between the piston seal and the lower end cover, a pressurizing hole is arranged on the lower end cover, and the pressurizing device is communicated with the cavity through the pressurizing hole;
The pressurizing device pressurizes the piston seal to press the combined seal so as to adjust the combined seal clearance of the combined seal.
In the preferred scheme, the piston seal sleeve is arranged in the lower end cover, a boss is arranged at the sealing end part of the piston, the end face of the boss abuts against the sealing end cover, a cavity IV is formed by the bottom face of one side of the boss and the sealing end cover, a pressurizing connector is arranged on a pressurizing hole of the lower end cover, and the pressurizing connector is communicated with the cavity IV.
In the preferred scheme, the adjusting device is a screw adjusting device and has the structure that: the device comprises an adjusting screw rod, wherein the adjusting screw rod passes through a sealing end cover and is in sealing connection with a piston, and the end part of the adjusting screw rod is abutted against the piston seal or is in sealing threaded connection with the piston;
And an adjusting nut is further arranged on the adjusting screw, and the end face of the adjusting nut is abutted against the sealing end cover for locking the adjusting screw.
In the preferred scheme, a first table top is arranged on the piston seal, a third cavity is formed between the first table top and a first boss surface in the lower end cover, and a spring is arranged in the third cavity.
In the preferred scheme, one side of the first table top is also provided with a second table top, a first cavity is formed between the second table top and a second boss surface in the lower end cover, and the distance between the second table top and the second boss surface of the lower end cover is delta, wherein delta is 0-4mm.
In the preferred scheme, the piston seal is last to be equipped with the oilhole, and piston seal inner wall is equipped with annular cell body, and cell body and piston rod form cavity two, oilhole and cavity two intercommunication are equipped with the pressure measurement joint on the lower extreme cover, and the pressure measurement connects through oilhole and cavity two intercommunication.
In the preferred scheme, the pressure measuring joint is electrically connected with the detection device, the detection device is electrically connected with the pressurizing device, and the pressurizing device is communicated with the pressurizing joint.
In the preferred scheme, the combined seal is a V-shaped combined seal, a Y-shaped combined seal, a Griley ring or an O-shaped ring;
A plurality of groove bodies are arranged in the piston seal, and guide sleeves are arranged in the groove bodies;
The inner part and the outer wall of the piston seal are provided with a plurality of combined seal grooves, and the inner parts of the combined seal grooves are provided with piston rod combined seals;
a first O-shaped sealing ring is arranged between the sealing end cover and the lower end cover;
a second O-shaped sealing ring is also arranged between the piston seal and the lower end cover, an O-shaped sealing groove is arranged on the outer wall of the piston seal, and the second O-shaped sealing ring is arranged inside the O-shaped sealing groove.
The self-adaptive adjusting method comprises the following steps:
s1, a closed cavity is formed between a lower end cover and a sealing end cover, and a piston is arranged in the closed cavity in a sealing way;
S2, installing a pressure measuring joint, wherein the pressure measuring joint is communicated with a second cavity in the piston seal, the pressure measuring joint is used for measuring seal leakage pressure, and the pressure measuring joint is communicated with a detection device;
s3, installing a pressurizing connector, wherein the pressurizing connector is communicated with the cavity IV, and the pressurizing connector is communicated with a pressurizing device;
s4, the detecting device measures the pressure in the second cavity, the pressure in the second cavity is the sealing leakage pressure, data are transmitted to the detecting device after the leakage pressure is measured, the detecting device controls the pressurizing device according to the measured transmission, the pressurizing device feeds oil from the pressurizing connector through the hydraulic system, and the piston is pushed to move left in a sealing mode to adjust the V-shaped combined sealing gap;
S5, the spring in the cavity is used for balancing the combined sealing extrusion force and the hydraulic thrust of the sealing end face of the piston, so that the extrusion amount of the combined seal is adjusted, the combined seal is prevented from being excessively extruded excessively due to the fact that the hydraulic thrust of the sealing end face of the piston is excessively large, and the combined seal is increased in abrasion;
The screw adjusting method comprises the following steps:
s6, installing an adjusting screw rod, wherein the adjusting screw rod is in threaded connection with the sealing end cover, so that the end part of the adjusting screw rod is abutted against the piston seal or in threaded connection with the piston seal;
S7, the pressure measuring joint is used for measuring the sealing leakage pressure, and the measured pressure is displayed through the detection device;
s8, firstly rotating the adjusting nut in the direction, and then rotating the adjusting screw, wherein the adjusting screw pushes the pushing piston to move left in a sealing way so as to adjust the V-shaped combined sealing gap;
And S9, after the adjustment is finished, rotating the adjusting nut to lock the adjusting screw.
The invention provides a self-adaptive sealing device and a self-adaptive adjusting method for a hydraulic cylinder, and compared with the prior art, the self-adaptive sealing device has the following advantages:
1. The concentric sealing piston is designed to uniformly extrude and adjust the V-shaped combined sealing gap, so that the phenomenon of uneven extrusion stress of the V-shaped combined sealing is effectively avoided, excessive friction damage of the V-shaped combined seal is reduced, and the service life of the V-shaped combined seal is prolonged.
2. The pressure measuring joint is arranged to monitor the sealing leakage of the hydraulic cylinder on line, namely the abrasion of the V-shaped combined seal, the PLC control system gives an alarm and prompts, and controls the corresponding hydraulic system to feed oil from the pressure measuring joint so as to push the sealing piston to move left to adjust the clearance of the V-shaped combined seal.
3. And a damping spring is arranged in the cavity III and used for balancing the V-shaped combined sealing extrusion force and the hydraulic thrust of the end face of the sealing piston, so that the extrusion amount of the V-shaped combined sealing is regulated, the excessive hydraulic thrust of the end face of the sealing piston is avoided, the V-shaped combined sealing is excessively extruded, and the abrasion of the V-shaped combined sealing is aggravated.
4. The pressurizing connector is matched with the damping spring for use, and the axial compression amount of the V-shaped combined seal can be controlled in real time within the range of 0-delta of the seal adjustment gap.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a general block diagram of the present invention;
FIG. 2 is a diagram of the piston seal of the present invention;
FIG. 3 is a block diagram of the piston seal installation position of the present invention;
FIG. 4 is an enlarged view of the structure of FIG. 3A in accordance with the present invention;
FIG. 5 is a preferred block diagram of the adjusting screw of the present invention;
FIG. 6 is a preferred enlarged block diagram of the adjusting screw of the present invention;
In the figure: an upper end cap 1; a cylinder 2; a piston assembly 3; a piston rod 4; a lower end cap 5; v-shaped combined seal 6; a pressure measuring joint 7; a spring 8; a pressurizing joint 9; a piston seal 10; a seal end cap 11; an oil hole 12; an O-ring seal 13; a piston rod combination seal 14; a guide sleeve 15; a detection device 16; a pressurizing device 17; cavity one 18; a second cavity 19; cavity three 20; cavity four 21; a pressure measurement hole 22; an adjusting screw 23; an adjustment nut 24; a first mesa 25; a second mesa 26.
Detailed Description
Example 1
As shown in fig. 1-6, an adaptive sealing device for a hydraulic cylinder is provided with an upper end cover 1 and a lower end cover 5 at two ends of a cylinder body 2, a piston assembly 3 is arranged inside the cylinder body 2, a piston rod 4 passes through the lower end cover 5 and is in sliding sealing connection with the lower end cover 5, a sealing end cover 11 is further arranged at one end of the lower end cover 5, a sealing cavity is formed between the lower end cover 5 and the sealing end cover 11, a piston seal 10 is arranged inside the sealing cavity between the sealing end cover 11 and the lower end cover 5, a combined seal 6 is arranged between the piston seal 10 and the lower end cover 5, the piston seal 10 abuts against one end of the combined seal 6, and an adjusting device is further arranged for pushing the piston seal 10 to squeeze the combined seal 6 so as to adjust a combined seal clearance of the combined seal 6. The combined seal 6 is a V-shaped combined seal, and the adjusting device pushes the sealing piston to move left so as to adjust the clearance of the V-shaped combined seal. The concentric sealing piston is designed to uniformly extrude and adjust the V-shaped combined sealing gap, so that the phenomenon of uneven extrusion stress of the V-shaped combined sealing is effectively avoided, excessive friction damage of the V-shaped combined seal is reduced, and the service life of the V-shaped combined seal is prolonged.
In the preferred scheme, the adjusting device is a self-adaptive adjusting device, and the structure is as follows: a cavity is arranged between the piston seal 10 and the lower end cover 5, a pressurizing hole is arranged on the lower end cover 5, a pressurizing device 17 is communicated with the cavity through the pressurizing hole, and the pressurizing device 17 pressurizes the piston seal 10 to extrude the combined seal 6 so as to adjust the combined seal clearance of the combined seal 6. The pressure measuring connector 7 is used for measuring sealing leakage pressure, the pressure measuring connector 7 is used for communicating pressure oil and pushing the sealing piston to act so as to squeeze the V-shaped seal, and the V-shaped seal gap is adjusted.
In the preferred scheme, a piston seal 10 is sleeved inside a lower end cover 5, a boss is arranged at the end part of the piston seal 10, the end face of the boss is abutted against a seal end cover 11, a cavity IV 21 is formed by the bottom face of one side of the boss and the seal end cover 11, a pressurizing connector 9 is arranged on a pressurizing hole of the lower end cover 5, and the pressurizing connector 9 is communicated with the cavity IV 21. The pressurizing joint 9 pressurizes and extrudes the V-shaped combined seal of the cavity IV 21.
In the preferred scheme, the adjusting device is a screw adjusting device and has the structure that: the device comprises an adjusting screw rod 23, wherein the adjusting screw rod 23 penetrates through a sealing end cover 11 to be connected with a piston seal 10, the end part of the adjusting screw rod 23 abuts against the piston seal 10 or is in threaded connection with the piston seal 10, an adjusting nut 24 is further arranged on the adjusting screw rod 23, and the end face of the adjusting nut 24 abuts against the sealing end cover 11 to be used for locking the adjusting screw rod 23. The adjusting nut 24 is rotated in the direction first, then the adjusting screw rod 23 is rotated, the adjusting screw rod 23 pushes the pushing piston seal 10 to move left to adjust the V-shaped combined sealing gap, and after the adjustment is finished, the adjusting screw rod 23 is locked by rotating the adjusting nut 24.
In the preferred scheme, a first table top 25 is arranged on the piston seal 10, a third cavity 20 is formed by the first table top 25 and the first table top surface in the lower end cover 5, and a spring 8 is arranged in the third cavity 20. The spring 8 in the cavity III 20 is used for balancing the extrusion force of the combined seal 6 and the hydraulic thrust of the end face of the piston seal 10, so that the extrusion amount of the combined seal 6 is regulated, the combined seal 6 is prevented from being excessively extruded due to the fact that the hydraulic thrust of the end face of the piston seal 10 is excessively large, and abrasion of the combined seal 6 is aggravated.
In a preferred scheme, one side of the first table top 25 is also provided with a second table top 26, the second table top 26 and a second boss surface inside the lower end cover 5 form a cavity I18, and the distance between the second table top 26 and the second boss surface diameter of the lower end cover 5 is delta, wherein delta is 0-4mm. The pressurizing connector is matched with the damping spring for use, the axial compression amount of the V-shaped combined seal can be controlled in real time within the range of 0-delta of the seal adjustment gap, the first cavity 18 is a seal containing cavity between the lower end cover 5 and the seal piston, and the delta of the gap is the maximum adjustment length of the V-shaped combined seal.
In the preferred scheme, an oil hole 12 is formed in the piston seal 10, an annular groove body is formed in the inner wall of the piston seal 10, a cavity II 19 is formed between the groove body and the piston rod 4, the oil hole 12 is communicated with the cavity II 19, a pressure measuring joint 7 is arranged on the lower end cover 5, and the pressure measuring joint 7 is communicated with the cavity II 19 through the oil hole 12. The second cavity 19 forms an oil storage space for detecting oil pressure, so that the oil pressure in the second cavity 19 is conveniently measured to observe the sealing condition in the piston rod 4.
In a preferred embodiment, the pressure measuring joint 7 is electrically connected to the detecting device 16, the detecting device 16 is electrically connected to the pressurizing device 17, and the pressurizing device 17 is in communication with the pressurizing joint 9. After the pressure measurement of the pressure measurement joint 7, the pressure is automatically applied by the pressure application device 17.
In a preferred embodiment, the combined seal 6 is a V-shaped combined seal, or a Y-shaped combined seal, or a gurley ring, or an O-ring, and in this embodiment, the V-shaped combined seal is preferred.
The piston seal 10 is internally provided with a plurality of groove bodies, the inside of the groove bodies is provided with a guide sleeve 15, the inside and the outer wall of the piston seal 10 are provided with a plurality of combined seal grooves, and the inside of the combined seal grooves is provided with a piston rod combined seal 14; a first O-shaped sealing ring is arranged between the sealing end cover 11 and the lower end cover 5, a second O-shaped sealing ring is also arranged between the piston seal 10 and the lower end cover 5, an O-shaped sealing groove 13 is arranged on the outer wall of the piston seal 10, and the second O-shaped sealing ring is arranged inside the O-shaped sealing groove 13. The combined seal of the guide sleeve 15, the O-shaped seal ring and the piston rod is that the whole piston seal 10 has better sealing effect.
Example 2
Further describing in conjunction with embodiment 1, as shown in fig. 1 to 6, the adaptive adjustment method includes:
A closed cavity is formed between the end cover 5 and the sealing end cover 11, and the piston seal 10 is arranged in the closed cavity.
And a pressure measuring joint 7 is arranged, the pressure measuring joint 7 is communicated with a second cavity 19 inside the piston seal 10, the pressure measuring joint 7 is used for measuring seal leakage pressure, and the pressure measuring joint 7 is communicated with a detection device 16.
A pressurizing joint 9 is installed, the pressurizing joint 9 is communicated with the cavity IV21, and the pressurizing joint 9 is communicated with the pressurizing device 17.
The detection device 16 measures the pressure in the second cavity 19, the pressure in the second cavity 19 is the sealing leakage pressure, data are transmitted to the detection device 16 after the leakage pressure is measured, the detection device 16 controls the pressurizing device 17 according to the measured transmission, the pressurizing device 17 feeds oil from the pressurizing connector 9 through a hydraulic system, and the piston seal 10 is pushed to move left to adjust the V-shaped combined sealing gap.
The spring 8 in the cavity III 20 is used for balancing the extrusion force of the combined seal 6 and the hydraulic thrust of the end face of the piston seal 10, so that the extrusion amount of the combined seal 6 is regulated, the combined seal 6 is prevented from being excessively extruded due to the fact that the hydraulic thrust of the end face of the piston seal 10 is excessively large, and abrasion of the combined seal 6 is aggravated.
The screw adjusting method comprises the following steps:
In the same way as in the first and second steps, the adjusting screw 23 is installed, and the adjusting screw 23 is screwed with the seal end cap 11, so that the end of the adjusting screw 23 abuts against the piston seal 10 or is screwed with the piston seal 10.
The pressure tap 7 is used to measure the seal leakage pressure, the measured pressure being displayed by the detection means 16.
The adjusting nut 24 is rotated in the direction first, then the adjusting screw 23 is rotated, and the adjusting screw 23 pushes the pushing piston seal 10 to move left so as to adjust the V-shaped combined sealing gap.
After the adjustment is completed, the adjusting nut 24 is rotated again to lock the adjusting screw 23.
Example 3
As further described with reference to embodiments 1 and 2, as shown in fig. 1 to 6, the hydraulic cylinder self-adaptive dynamic sealing device includes a cylinder body 2, an upper end cover 1, a piston assembly 3, a piston rod 4, a lower end cover 5, a sealing end cover 11, and a sealing piston 10. The two ends of the cylinder body 2 are respectively connected with the upper end cover 1 and the lower end cover 5, the piston assembly 3 is fixedly arranged at one end of the piston rod 4 and moves inside the cylinder body 2, the sealing end cover 11 is connected with the lower end cover 5, and the sealing piston 10 is arranged between the lower end cover 5 and the sealing end cover 11.
The wall of the lower end cover 5 is provided with 2 oil ports, 1 pressure measuring oil port is communicated with an oil hole at the front end of the sealing piston 10, 1 pressure measuring oil port is communicated with a cavity IV 21, an O-shaped sealing ring is arranged between the lower end cover 5 and the cylinder body 2, a V combined seal is arranged between the lower end cover 5 and the piston rod 4, the sealing end cover 11 is connected with the lower end cover 5 through screws, the sealing end cover 5 is sealed with the lower end cover 5 through the O-shaped sealing ring, a combined seal and dust ring is arranged between the sealing end cover and the piston rod 4, the sealing piston 10 is provided with an oil hole at the front end hole wall, the upper end of the oil hole is communicated with the pressure measuring oil port, the lower end of the oil hole is communicated with a cavity IV 19, and a combined seal and guide belt are arranged between the sealing piston 10 and the lower end cover 5 and the piston rod 4.
Further, the pressure measuring port and the pressurizing port of the lower end cover 5 are respectively connected with a pressure connector in an external mode, wherein the pressure measuring connector is used for measuring sealing leakage pressure, the pressurizing connector is used for communicating pressure oil and pushing the sealing piston 10 to act so as to squeeze the V-shaped seal, and the V-shaped seal gap is adjusted.
Further, a threaded hole is formed in the end face of the sealing piston 10, and assembly of the sealing piston 10 is facilitated.
Further, a spring is arranged in the third cavity 20 and is used for adjusting a friction gap between the V-shaped combined seal and the piston rod 4.
Further, the first cavity 18 is a sealed cavity between the lower end cover 5 and the sealing piston 10, and the gap delta is the maximum adjustment length of the V-shaped combined seal.
The above embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention should be defined by the claims, including the equivalents of the technical features in the claims. I.e., equivalent replacement modifications within the scope of this invention are also within the scope of the invention.
Claims (3)
1. A hydraulic cylinder self-adaptive sealing device is characterized in that: the two ends of the cylinder body (2) are provided with an upper end cover (1) and a lower end cover (5), the piston assembly (3) is arranged inside the cylinder body (2), the piston rod (4) passes through the lower end cover (5) and is in sliding sealing connection with the lower end cover (5), one end of the lower end cover (5) is also provided with a sealing end cover (11), a sealing cavity is formed between the lower end cover (5) and the sealing end cover (11), a piston seal (10) is arranged inside the sealing cavity between the sealing end cover (11) and the lower end cover (5), a combined seal (6) is arranged between the piston seal (10) and the lower end cover (5), the piston seal (10) abuts against one end of the combined seal (6), and an adjusting device is further arranged for pushing the piston seal (10) to squeeze the combined seal (6) so as to adjust the combined seal clearance of the combined seal (6);
The adjusting device is a self-adaptive adjusting device and has the structure that: a cavity is arranged between the piston seal (10) and the lower end cover (5), a pressurizing hole is arranged on the lower end cover (5), and the pressurizing device (17) is communicated with the cavity through the pressurizing hole;
the pressurizing device (17) pressurizes the piston seal (10) to press the combined seal (6) so as to adjust the combined seal clearance of the combined seal (6);
The piston seal (10) is sleeved inside the lower end cover (5), a boss is arranged at the end part of the piston seal (10), the end face of the boss is abutted against the seal end cover (11), a cavity IV (21) is formed by the bottom surface of one side of the boss and the seal end cover (11), a pressurizing connector (9) is arranged on a pressurizing hole of the lower end cover (5), and the pressurizing connector (9) is communicated with the cavity IV (21);
a first table top (25) is arranged on the piston seal (10), the first table top (25) and a first boss surface inside the lower end cover (5) form a cavity III (20), and a spring (8) is arranged inside the cavity III (20);
A second table top (26) is further arranged on one side of the first table top (25), the second table top (26) and a second boss surface inside the lower end cover (5) form a first cavity (18), and the distance between the second table top (26) and the second boss surface diameter of the lower end cover (5) is delta, wherein delta is 0-4mm;
An oil hole (12) is formed in the piston seal (10), an annular groove body is formed in the inner wall of the piston seal (10), a cavity II (19) is formed between the groove body and the piston rod (4), the oil hole (12) is communicated with the cavity II (19), a pressure measuring joint (7) is arranged on the lower end cover (5), and the pressure measuring joint (7) is communicated with the cavity II (19) through the oil hole (12);
the pressure measuring joint (7) is electrically connected with the detecting device (16), the detecting device (16) is electrically connected with the pressurizing device (17), and the pressurizing device (17) is communicated with the pressurizing joint (9).
2. The hydraulic cylinder self-adaptive sealing device according to claim 1, wherein: the combined seal (6) is a V-shaped combined seal, a Y-shaped combined seal, a Griley ring or an O-shaped ring;
a plurality of groove bodies are arranged in the piston seal (10), and a guide sleeve (15) is arranged in each groove body;
A plurality of combined sealing grooves are formed in the inner part and the outer wall of the piston seal (10), and a piston rod combined seal (14) is arranged in the plurality of combined sealing grooves;
A first O-shaped sealing ring is arranged between the sealing end cover (11) and the lower end cover (5);
A second O-shaped sealing ring is also arranged between the piston seal (10) and the lower end cover (5), an O-shaped sealing groove (13) is arranged on the outer wall of the piston seal, and the second O-shaped sealing ring is arranged inside the O-shaped sealing groove (13).
3. The method for adaptively adjusting the adaptive sealing device of the hydraulic cylinder according to claim 1, wherein the method comprises the following steps: the self-adaptive adjusting method comprises the following steps:
S1, a closed cavity is formed between a lower end cover (5) and a sealing end cover (11), and a piston seal (10) is arranged in the closed cavity;
s2, installing a pressure measuring joint (7), wherein the pressure measuring joint (7) is communicated with a cavity II (19) in the piston seal (10), the pressure measuring joint (7) is used for measuring seal leakage pressure, and the pressure measuring joint (7) is communicated with a detection device (16);
S3, installing a pressurizing connector (9), wherein the pressurizing connector (9) is communicated with the cavity IV (21), and the pressurizing connector (9) is communicated with a pressurizing device (17);
s4, the detecting device (16) measures the pressure in the cavity II (19), the pressure in the cavity II (19) is the sealing leakage pressure, data are transmitted to the detecting device (16) after the leakage pressure is measured, the detecting device (16) controls the pressurizing device (17) according to the measured transmission, the pressurizing device (17) feeds oil from the pressurizing connector (9) through a hydraulic system, and the piston seal (10) is pushed to move left to adjust the V-shaped combined sealing gap;
s5, a spring (8) in the cavity III (20) is used for balancing extrusion force of the combined seal (6) and hydraulic thrust of the end face of the piston seal (10), so that extrusion amount of the combined seal (6) is adjusted, the excessive hydraulic thrust of the end face of the piston seal (10) is avoided, the combined seal (6) is extruded excessively, and abrasion of the combined seal (6) is increased.
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