CN114017414A - Self-adaptive sealing device of hydraulic cylinder and self-adaptive adjusting method - Google Patents

Self-adaptive sealing device of hydraulic cylinder and self-adaptive adjusting method Download PDF

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Publication number
CN114017414A
CN114017414A CN202111282649.3A CN202111282649A CN114017414A CN 114017414 A CN114017414 A CN 114017414A CN 202111282649 A CN202111282649 A CN 202111282649A CN 114017414 A CN114017414 A CN 114017414A
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China
Prior art keywords
end cover
seal
sealing
piston
cavity
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CN202111282649.3A
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Chinese (zh)
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CN114017414B (en
Inventor
刘永秀
李政
周一松
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WUHAN LIDI HYDRAULIC EQUIPMENT CO Ltd
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WUHAN LIDI HYDRAULIC EQUIPMENT CO Ltd
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Publication of CN114017414A publication Critical patent/CN114017414A/en
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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
    • 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
    • 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
    • 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 adjusting 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 connected with the lower end cover in a sliding and sealing manner, a sealing end cover is also arranged at one end of the lower end cover, a sealed cavity is formed between the lower end cover and the sealing end cover, a piston seal is arranged in the sealed 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 also arranged and used 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 seal to move left to adjust the V-shaped combined seal gap.

Description

Self-adaptive sealing device of hydraulic cylinder and self-adaptive adjusting method
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, a hydraulic cylinder is used as an actuator, a piston rod or a cylinder thereof reciprocates to transmit an acting force, and a V-type combined seal, a Y-type combined seal, a gray ring, an O-ring, or the like is generally used for sealing between moving members with hydraulic oil. However, due to the characteristics of the sealing structure of the sealing element, the wear-resisting property of materials, the admixture of impurities in hydraulic oil, the existence of working conditions such as offset load and the like, the wear of the dynamic sealing element of the hydraulic cylinder is aggravated, and a sealing gap is generated, so that the leakage of the hydraulic oil is caused.
At present, relevant researches are also made on the self-adaptive technology of the dynamic seal of the hydraulic cylinder, wherein firstly, pressure oil enters the bottom of a seal groove by utilizing a guide groove to play a role in extruding a seal piece and achieve the purpose of adjusting a seal gap, such as ' CN201310542667.X ' a self-sealing double-acting hydraulic cylinder '; secondly, a nested sealing structure is adopted, and pressure oil is introduced to deform the plastic sleeve to extrude a sealing element, so that the purpose of adjusting a sealing gap is realized, for example, CN201210398184.2 is a hydraulic cylinder piston self-adaptive sealing device; thirdly, an elastic damping ring is designed, and the tension degree is adjusted through oil pressure, so that the purpose of adjusting the gap of the sealing element is achieved.
In conclusion, the self-adaptive sealing technical scheme of the existing hydraulic cylinder has the following problems: firstly, the scheme of directly extruding a sealing element by utilizing 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 kinetic friction force is overlarge; secondly, the scheme of adjusting the clearance is achieved by means of the compression deformation and extrusion of other parts, the compression deformation of a deformation part is complex, and the deformation is not suitable to be controlled, so that the extrusion of the sealing part is uneven, and the sealing effect is influenced.
Chinese patent 'CN 107605855A' is a V-shaped combined sealing structure in a plunger type oil cylinder, which 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 close 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 opening guide sleeve; and the clearance between the plunger and the cylinder opening guide sleeve is 1-2 mm. The scheme of adjusting the clearance is achieved by means of pressing, deforming and extruding the sealing element by other parts, the deformation of the deformed element is complex in pressing and deformation, and the deformation is not suitable to be controlled, so that the extrusion of the sealing element is uneven, and the sealing effect is influenced.
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 combining cap, wherein the oil cylinder cover and the combining cap are sleeved on the piston rod; a stepped hole is formed in the oil cylinder cover, and a cap is embedded into the stepped hole and is in sliding fit with the stepped 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 means of pressing, deforming and extruding the sealing element by other parts, the deformation of the deformed element is complex in pressing and deformation, and the deformation is not suitable to be controlled, so that the extrusion of the sealing element is uneven, and the sealing effect is influenced.
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 a 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 technical scheme adopted by the invention is as follows: 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 is connected with lower end cover sliding seal, lower end cover one end still is equipped with the end cover, form airtight cavity between lower end cover and the end cover, be equipped with piston seal inside the airtight cavity between end cover and the lower end cover, be equipped with combined seal between piston seal and the lower end cover, piston seal supports and leans on combined seal one end, still be equipped with adjusting device, adjusting device is used for promoting piston seal extrusion combined seal, with the combined seal clearance of adjustment combined seal.
In a 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 to enable the piston seal to extrude the combined seal so as to adjust the combined seal gap of the combined seal.
In the preferred scheme, the piston is sleeved inside the lower end cover in a sealing manner, the end part of the piston is provided with a boss, the end face of the boss abuts against the sealing end cover, the bottom surface of one side of the boss and the sealing end cover form a cavity IV, a pressurizing joint is arranged on a pressurizing hole of the lower end cover and is communicated with the cavity IV.
In the preferred scheme, adjusting device is screw rod adjusting device, and the structure is: the piston sealing device comprises an adjusting screw rod, wherein the adjusting screw rod penetrates through a sealing end cover to be in sealing connection with a piston, and the end part of the adjusting screw rod is abutted against the piston seal or in threaded connection with the piston seal;
and the adjusting screw rod is also provided with an adjusting nut, and the end face of the adjusting nut abuts against the sealing end cover to lock the adjusting screw rod.
In the preferred scheme, a first table top is arranged on the piston seal, a third cavity is formed by the first table top and a first boss surface inside the lower end cover, and a spring is arranged inside the third cavity.
In a preferable scheme, a second table top is further arranged on one side of the first table top, a first cavity is formed between the second table top and a second boss face in the lower end cover, the distance between the second table top and the diameter of the second boss face of the lower end cover is delta, and the delta is 0-4 mm.
In the preferred scheme, an oil hole is formed in the piston seal, an annular groove body is formed in the inner wall of the piston seal, a second cavity is formed by the groove body and the piston rod, the oil hole is communicated with the second cavity, a pressure measuring joint is arranged on the lower end cover, and the pressure measuring joint is communicated with the second cavity through the oil hole.
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, or a Y-shaped combined seal, or a Glae 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;
a plurality of combined sealing grooves are formed in the inner part and the outer wall of the piston seal, and piston rod combined seals are arranged in the combined sealing grooves;
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 formed in 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 sealed cavity is formed between the lower end cover and the sealing end cover, and the piston is hermetically arranged in the sealed cavity;
s2, installing a pressure measuring joint, wherein the pressure measuring joint is communicated with a cavity II 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 is communicated with a pressurizing device;
s4, the detection device measures the pressure inside the cavity II, the pressure inside the cavity II is sealing leakage pressure, data are transmitted to the detection device after the leakage pressure is measured, the detection device controls the pressurization device according to the measured transmission, the pressurization device feeds oil from the pressurization joint through the hydraulic system, and the piston seal is pushed to move left to adjust the V-shaped combined sealing gap;
s5, a spring in the cavity III 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 excessive hydraulic thrust of the sealing end face of the piston is avoided, the combined seal is excessively extruded, and the abrasion of the combined seal is intensified;
the screw adjusting method comprises the following steps:
s6, installing an adjusting screw rod which is in threaded connection with the sealing end cover to enable the end part of the adjusting screw rod to abut against the piston seal or be in threaded connection with the piston seal as in the steps S1-S2;
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, then rotating the adjusting screw rod, and pushing the piston to move left by the pushing of the adjusting screw rod 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 of 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 nonuniform 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 hydraulic cylinder seal leakage on line, namely the V-shaped combined seal abrasion, the PLC control system gives an alarm for prompting, and controls the corresponding hydraulic system to feed oil from the pressure measuring joint to push the sealing piston to move left to adjust the V-shaped combined seal gap.
3. The damping spring is arranged in the accommodating cavity 3 and used for balancing the extrusion force of the V-shaped combined seal and the hydraulic thrust of the end face of the seal piston, so that the extrusion amount of the V-shaped combined seal is adjusted, the phenomenon that the hydraulic thrust of the end face of the seal piston is too large, the V-shaped combined seal is excessively extruded, and the abrasion of the V-shaped combined seal is aggravated is avoided.
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 adjusting 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 view of the piston seal configuration of the present invention;
FIG. 3 is a view showing the construction of the seal mounting position of the piston according to the present invention;
FIG. 4 is an enlarged view of the structure of FIG. 3A of the present invention;
FIG. 5 is a preferred block diagram of the adjusting screw of the present invention;
FIG. 6 is an enlarged, preferred, structural view of the adjusting screw of the present invention;
in the figure: an upper end cover 1; a cylinder body 2; a piston assembly 3; a piston rod 4; a lower end cap 5; a V-shaped combined seal 6; a pressure measuring joint 7; a spring 8; a pressure fitting 9; a piston seal 10; a seal end cap 11; an oil hole 12; an O-shaped seal groove 13; a piston rod combination seal 14; a guide sleeve 15; a detection device 16; a pressurizing device 17; a first cavity 18; a second cavity 19; a cavity III 20; a cavity four 21; a pressure tap 22; an adjusting screw 23; an adjusting nut 24; a first mesa 25; a second mesa 26.
Detailed Description
Example 1
As shown in fig. 1 to 6, an adaptive sealing device for a hydraulic cylinder, an upper end cover 1 and a lower end cover 5 are arranged at two ends of a cylinder body 2, a piston assembly 3 is arranged inside the cylinder body 2, a piston rod 4 penetrates through the lower end cover 5 and is connected with the lower end cover 5 in a sliding sealing manner, a sealing end cover 11 is further arranged at one end of the lower end cover 5, a sealed cavity is formed between the lower end cover 5 and the sealing end cover 11, a piston seal 10 is arranged inside the sealed 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 and used for pushing the piston seal 10 to extrude the combined seal 6 so as to adjust a combined seal gap 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 to adjust the V-shaped combined seal gap. The concentric sealing piston is designed to uniformly extrude and adjust the V-shaped combined sealing gap, so that the phenomenon of nonuniform 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 a 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 to enable the piston seal 10 to extrude the combined seal 6 so as to adjust the combined seal gap of the combined seal 6. And the pressure measuring oil port and the pressurizing oil port of the lower end cover 5 are respectively externally connected with a pressure measuring joint 7, wherein the pressure measuring joint 7 is used for measuring the sealing leakage pressure, and the pressurizing joint is used for introducing pressure oil and pushing the sealing piston to act so as to extrude the V-shaped seal, so that the V-shaped seal gap is adjusted.
In the preferred scheme, the piston seal 10 is sleeved inside the lower end cover 5, the end part of the piston seal 10 is provided with a boss, the end face of the boss abuts against the sealing end cover 11, the bottom surface of one side of the boss and the sealing end cover 11 form a cavity IV 21, a pressurizing joint 9 is arranged on a pressurizing hole of the lower end cover 5, and the pressurizing joint 9 is communicated with the cavity IV 21. The pressurizing connector 9 is used for pressurizing and extruding the V-shaped combined seal for the cavity four 21.
In the preferred scheme, adjusting device is screw rod adjusting device, and the structure is: the piston sealing 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 and is used for locking the adjusting screw rod 23. The adjusting nut 24 is rotated in the first direction, then the adjusting screw 23 is rotated, the adjusting screw 23 pushes the piston seal 10 to move left to adjust the V-shaped combined seal gap, and after the adjustment is finished, the adjusting nut 24 is rotated to lock the adjusting screw 23.
In a preferable scheme, a first table 25 is arranged on the piston seal 10, a third cavity 20 is formed by the first table 25 and a first boss surface inside the lower end cover 5, and a spring 8 is arranged inside 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 adjusted, the hydraulic thrust of the end face of the piston seal 10 is too large, the combined seal 6 is excessively extruded, and the abrasion of the combined seal 6 is aggravated.
In a preferable scheme, a second table surface 26 is further arranged on one side of the first table surface 25, the first cavity 18 is formed between the second table surface 26 and a second boss surface inside the lower end cover 5, the distance between the second table surface 26 and the second boss surface of the lower end cover 5 is delta, and delta is 0-4 mm. The pressurizing connector is matched with a 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 adjusting gap, the first cavity 18 is a seal containing cavity between the lower end cover 5 and the seal piston, and the gap delta is the maximum adjusting 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, the groove body and the piston rod 4 form a second cavity 19, the oil hole 12 is communicated with the second cavity 19, a pressure measuring joint 7 is arranged on the lower end cover 5, and the pressure measuring joint 7 is communicated with the second cavity 19 through the oil hole 12. The second cavity 19 forms an oil storage space for detecting oil pressure, and the oil pressure in the second cavity 19 is conveniently measured to observe the internal sealing condition of the piston rod 4.
In a preferable scheme, the pressure measuring joint 7 is electrically connected with the detection device 16, the detection device 16 is electrically connected with the pressurizing device 17, and the pressurizing device 17 is communicated with the pressurizing joint 9. After the pressure is measured by the pressure measuring joint 7, the pressure is automatically increased by the pressure increasing device 17.
In the preferred scheme, the combined seal 6 is a V-shaped combined seal, or a Y-shaped combined seal, or a Glae ring, or an O-shaped ring, and the V-shaped combined seal is preferred in the scheme.
A plurality of groove bodies are arranged inside the piston seal 10, a guide sleeve 15 is arranged inside each groove body, a plurality of combined seal grooves are arranged inside and on the outer wall of the piston seal 10, and piston rod combined seals 14 are arranged inside the combined seal 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 formed in the outer wall of the piston seal, and the second O-shaped sealing ring is arranged inside the O-shaped sealing groove 13. The guide sleeve 15, the O-shaped sealing ring and the piston rod are combined for sealing, so that the whole piston seal 10 has a better sealing effect.
Example 2
Further described with reference to 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 installing a pressure measuring joint 7, wherein 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 the seal leakage pressure, and the pressure measuring joint 7 is communicated with the detection device 16.
And 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.
The detection device 16 measures the pressure in the cavity II 19, the pressure in the cavity II 19 is sealing leakage pressure, data are transmitted to the detection device 16 after the leakage pressure is measured, the detection device 16 controls the pressurization device 17 according to the measured transmission, the pressurization device 17 feeds oil from the pressurization joint 9 through a hydraulic system, and the piston seal 10 is pushed to move left to adjust the V-shaped combined seal 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 adjusted, the hydraulic thrust of the end face of the piston seal 10 is too large, the combined seal 6 is excessively extruded, and the abrasion of the combined seal 6 is aggravated.
The screw adjusting method comprises the following steps:
and in the same first and second steps, installing an adjusting screw 23, wherein the adjusting screw 23 is in threaded connection with the sealing end cover 11, so that the end part of the adjusting screw 23 abuts against the piston seal 10 or is in threaded connection with the piston seal 10.
The pressure tap 7 is used to measure the seal leakage pressure, which is displayed by the detection means 16.
The adjusting nut 24 is turned in the first direction, and then the adjusting screw 23 is turned, and the adjusting screw 23 pushes the piston seal 10 to move left to adjust the V-shaped combined seal gap.
After the adjustment is finished, the adjusting nut 24 is rotated to lock the adjusting screw 23.
Example 3
Further described with reference to embodiments 1 and 2, as shown in fig. 1 to 6, the hydraulic cylinder 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. Two ends of the cylinder body 2 are respectively connected to 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 to 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 lower end cover 5, its pore wall is equipped with 2 hydraulic fluid ports, 1 be the pressure measurement hydraulic fluid port with the front end oilhole of sealed piston 10 communicates with each other, 1 be the pressure hydraulic fluid port and hold the chamber 4 and communicate with each other, be equipped with O type sealing washer between lower end cover 5 and cylinder body 2, with be equipped with V combination seal between piston rod 4, sealed end cover 11, its with lower end cover 5 is with bolted connection, uses O type circle to seal with lower end cover 5, and is equipped with combination seal and dust ring between piston rod 4, sealed piston 10, its front end orifice wall is equipped with the oilhole, and the oilhole upper end communicates with each other with the pressure measurement hydraulic fluid port, and the oilhole lower extreme communicates with each other with holding two 19 cavitys, be equipped with combination seal and guidance tape between sealed piston 10 and lower end cover 5 and piston rod 4.
Further, a pressure measuring oil port and a pressurizing oil port of the lower end cover 5 are respectively externally connected with a pressure joint, wherein the pressure measuring joint is used for measuring sealing leakage pressure, and the pressurizing joint is used for introducing pressure oil and pushing the sealing piston 10 to act so as to extrude the V-shaped seal, so that the V-shaped seal gap is adjusted.
Further, the end face of the sealing piston 10 is provided with a threaded hole, so that the sealing piston 10 is convenient to assemble.
Further, a spring is arranged in the accommodating cavity 3 and 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 a gap δ of the first cavity is the maximum adjustment length of the V-shaped combined seal.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention is defined by the claims, and equivalents including technical features described in the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.

Claims (10)

1. The utility model provides a pneumatic cylinder self-adaptation sealing device which characterized by: the piston assembly is characterized in that an upper end cover (1) and a lower end cover (5) are arranged at two ends of a cylinder body (2), a piston assembly (3) is arranged inside the cylinder body (2), a piston rod (4) penetrates through the lower end cover (5) and is connected with the lower end cover (5) in a sliding and sealing mode, a sealing end cover (11) is further arranged at one end of the lower end cover (5), a sealed cavity is formed between the lower end cover (5) and the sealing end cover (11), a piston seal (10) is arranged inside the sealed 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) is abutted against one end of the combined seal (6), and an adjusting device is further arranged and used for pushing the piston seal (10) to extrude the combined seal (6) so as to adjust a combined seal gap of the combined seal (6).
2. The adaptive sealing device for the hydraulic cylinder as claimed in claim 1, wherein: 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 to enable the piston seal (10) to press the combined seal (6) so as to adjust the combined seal gap of the combined seal (6).
3. The adaptive sealing device for the hydraulic cylinder as claimed in claim 2, wherein: the piston seal (10) is sleeved inside the lower end cover (5), the end part of the piston seal (10) is provided with a boss, the end face of the boss abuts against the sealing end cover (11), the bottom surface of one side of the boss and the sealing end cover (11) form a cavity four (21), a pressurizing joint (9) is arranged on a pressurizing hole of the lower end cover (5), and the pressurizing joint (9) is communicated with the cavity four (21).
4. The adaptive sealing device for the hydraulic cylinder as claimed in claim 1, wherein: adjusting device is screw rod adjusting device, and the structure is: the piston sealing 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), and 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) and is used for locking the adjusting screw rod (23).
5. The adaptive sealing device for the hydraulic cylinder as claimed in claim 1, wherein: a first table board (25) is arranged on the piston seal (10), a cavity III (20) is formed by the first table board (25) and a first boss surface inside the lower end cover (5), and a spring (8) is arranged inside the cavity III (20).
6. The adaptive sealing device for the hydraulic cylinder as claimed in claim 1, wherein: a second table top (26) is further arranged on one side of the first table top (25), a first cavity (18) is formed between the second table top (26) and a second boss surface in the lower end cover (5), the distance between the second table top (26) and the diameter of the second boss surface of the lower end cover (5) is delta, and delta is 0-4 mm.
7. The adaptive sealing device for the hydraulic cylinder as claimed in claim 1, wherein: 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 second cavity (19) is formed by the groove body and the piston rod (4), the oil hole (12) is communicated with the second cavity (19), a pressure measuring joint (7) is arranged on the lower end cover (5), and the pressure measuring joint (7) is communicated with the second cavity (19) through the oil hole (12).
8. The adaptive sealing device for the hydraulic cylinder as claimed in claim 7, wherein: the pressure measuring joint (7) is electrically connected with the detection device (16), the detection device (16) is electrically connected with the pressurizing device (17), and the pressurizing device (17) is communicated with the pressurizing joint (9).
9. The adaptive sealing device for the hydraulic cylinder as claimed in claim 1, wherein: the combined seal (6) is a V-shaped combined seal, or a Y-shaped combined seal, or a Glare ring, or an O-shaped ring;
a plurality of groove bodies are arranged in the piston seal (10), and guide sleeves (15) are arranged in the groove bodies;
a plurality of combined sealing grooves are formed in the inner part and the outer wall of the piston seal (10), and piston rod combined seals (14) are arranged in the 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 formed in the outer wall of the piston seal, and the second O-shaped sealing ring is arranged inside the O-shaped sealing groove (13).
10. The adaptive adjustment method of the adaptive sealing device of the hydraulic cylinder according to claim 1, characterized in that: the self-adaptive adjusting method comprises the following steps:
s1, a closed cavity is formed between the lower end cover (5) and the sealing end cover (11), and the 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, measuring the pressure inside a second cavity (19) by a detection device (16), wherein the pressure inside the second cavity (19) is sealing leakage pressure, transmitting data to the detection device (16) after the leakage pressure is measured, controlling a pressurizing device (17) by the detection device (16) according to the measured transmission, and allowing the pressurizing device (17) to feed oil from a pressurizing joint (9) through a hydraulic system to push a piston seal (10) to move left to adjust a V-shaped combined seal gap;
s5, a 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 adjusted, the excessive hydraulic thrust of the end face of the piston seal (10) is avoided, the combined seal (6) is excessively extruded, and the abrasion of the combined seal (6) is intensified;
the screw adjusting method comprises the following steps:
s6, installing an adjusting screw rod (23) in the same step as S1-S2, wherein the adjusting screw rod (23) is in threaded connection with the sealing end cover (11), and the end part of the adjusting screw rod (23) is abutted against the piston seal (10) or is in threaded connection with the piston seal (10);
s7, the pressure measuring joint (7) is used for measuring the sealing leakage pressure, and the measured pressure is displayed through the detection device (16);
s8, firstly, rotating the adjusting nut (24) in the direction, then, rotating the adjusting screw rod (23), and pushing the piston seal (10) to move left by the pushing of the adjusting screw rod (23) so as to adjust the V-shaped combined seal gap;
and S9, after the adjustment is finished, rotating the adjusting nut (24) to lock the adjusting screw rod (23).
CN202111282649.3A 2021-11-01 2021-11-01 Hydraulic cylinder self-adaptive sealing device and self-adaptive adjusting method Active CN114017414B (en)

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CN216407346U (en) * 2021-11-01 2022-04-29 武汉力地液压设备有限公司 Self-adaptive sealing device of hydraulic cylinder
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CN108286541A (en) * 2018-02-26 2018-07-17 中钢集团西安重机有限公司 A kind of cylinder piston rod V groups sealing structure unit and its installation method
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