CN111348597B - Gas-liquid double-medium buffer oil cylinder and buffer method thereof - Google Patents
Gas-liquid double-medium buffer oil cylinder and buffer method thereof Download PDFInfo
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- CN111348597B CN111348597B CN202010219834.7A CN202010219834A CN111348597B CN 111348597 B CN111348597 B CN 111348597B CN 202010219834 A CN202010219834 A CN 202010219834A CN 111348597 B CN111348597 B CN 111348597B
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- 239000007788 liquid Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000006835 compression Effects 0.000 claims abstract description 24
- 238000007906 compression Methods 0.000 claims abstract description 24
- 230000003139 buffering effect Effects 0.000 claims description 10
- 230000002265 prevention Effects 0.000 claims description 10
- 230000001502 supplementing effect Effects 0.000 claims description 9
- 238000010992 reflux Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
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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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/204—Control means for piston speed or actuating force without external control, e.g. control valve inside the piston
-
- 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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
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- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a gas-liquid double-medium buffer oil cylinder and a buffer method thereof. The invention fully utilizes the huge compression ratio and high elasticity of the gas in the annular rod cavity of the front cylinder barrel of the system, so that when the buffer oil in the annular rod cavity just begins to work, the rear cylinder of the system is synchronously started, the piston head at one end of the piston rod is not contacted with the cylinder cover, the impact caused by the direct impact of the piston head and the cylinder cover when the front cylinder of the system and the rear cylinder of the system are switched is greatly reduced, and the smooth switching between the front cylinder of the system and the rear cylinder of the system is realized.
Description
Technical Field
The invention relates to the technical field of forklifts, in particular to a gas-liquid double-medium buffer oil cylinder and a buffer method thereof.
Background
At present, the fork truck industry and fork truck market have more and more demands for configuring a full-freedom lifting system, and the market demands are higher and higher, such as a two-stage full-freedom lifting system, a three-stage full-freedom lifting system and even a four-stage full-freedom lifting system.
However, a problem in the forklift industry is not solved well, namely, the problem that the front cylinder and the rear cylinder of the system of the full-free portal generate impact during switching action can cause shaking of the forklift, so that the stability of the forklift is reduced, and the driving comfort of a driver is seriously affected by the shaking of the forklift.
Disclosure of Invention
The invention aims to provide a gas-liquid double-medium buffer oil cylinder and a buffer method thereof, which are used for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the gas-liquid double-medium buffer oil cylinder comprises a cylinder barrel, a cylinder cover, a piston rod and a piston head arranged at one end of the piston rod, wherein the piston rod drives the piston head to move along the axial direction of the cylinder barrel;
the cylinder barrel and the piston rod form an annular rod cavity in which buffer oil is filled;
one end of the piston rod positioned in the cylinder barrel is provided with a mounting hole for mounting a piston head and an oil storage chamber for storing oil in sequence along the axial direction, and the tail end of the mounting hole is communicated with the oil storage chamber;
the piston rod is located one side of the mounting hole and is provided with an orifice and a backflow hole along the radial direction, one end of the orifice is communicated with a throttling oil duct transversely arranged on the piston head, and one end of the backflow hole is communicated with the tail end of the mounting hole or the oil storage chamber.
As a further scheme of the invention: the middle part of the piston head is sequentially provided with a fixing hole for installing a one-way valve and an anti-overflow hole communicated with the tail end of the installing hole from one end of the rodless cavity to one end of the rod cavity;
the overflow prevention pipe is arranged in a section of the overflow prevention hole close to the tail end of the mounting hole, and one end of the overflow prevention pipe extends into the oil storage chamber.
As a further scheme of the invention: the buffer oil enters the oil storage chamber from the rod cavity of the cylinder barrel through the throttle hole, the throttle oil duct and the tail end of the mounting hole in sequence to form a throttle passage;
the buffer oil liquid sequentially passes through the tail end of the mounting hole and the reflux hole from the oil storage chamber and enters the rod cavity of the cylinder barrel to form a reflux channel.
As a further scheme of the invention: threaded holes are formed in one side, close to the rod cavity of the cylinder cover, of the cylinder barrel, and air supplementing screws are arranged in the threaded holes.
The invention also provides the following technical scheme:
a buffer method of a gas-liquid double-medium buffer cylinder, wherein the gas-liquid double-medium buffer cylinder is a front cylinder of a system;
the volume of the oil storage chamber is reasonably designed, and the oil storage chamber is used for storing gas in a rod cavity of the cylinder barrel and the buffer oil; before the buffer oil in the rod cavity of the cylinder barrel works, the gas compression in the rod cavity of the cylinder barrel is utilized to increase the system pressure, so that smooth switching between the front cylinder of the system and the rear cylinder of the system is realized;
the specific calculation steps of the volume value of the oil storage chamber are as follows:
s1, calculating the upper limit of air pressure when the air in the cylinder barrel sealed rod cavity is compressed;
s2, calculating the volume value of the oil storage chamber according to the Boyle gas equation and the volume relation between the compressed air pressure and the oil storage chamber.
As a further scheme of the invention: in the step S1, the upper limit of the air pressure when the air in the rod cavity of the cylinder is compressed is calculated, and the following conditions are satisfied:
in condition 1, the pressure of the compressed gas in the cylinder barrel sealed with the rod cavity can not open the one-way valve, namely
Condition 2, before the compression of the gas in the closed rod cavity of the cylinder barrel is finished, the reaction pressure, the normal working pressure and the along-the-way pressure loss formed in the rodless cavity of the cylinder barrel are equal to the starting pressure of the rear cylinder of the system, namely
Wherein P is Air-conditioner : air pressure at the time of front cylinder gas compression, P Front cylinder : working pressure of front cylinder, P Rear cylinder : working pressure of rear cylinder, P 1-5 : opening pressure of the check valve, Δp: the pressure loss along the way of a communication pipeline between the front cylinder and the rear cylinder of the system; d (D) 1-2 : inner diameter of cylinder barrel D 1-3 : diameter of the piston rod.
As a further scheme of the invention: in the step S2, according to the boyle gas equation, the following formula is obtained from the volume relationship between the compressed air pressure and the oil storage chamber:
wherein P is Atmospheric air : atmospheric pressure, V 1-7 : volume of oil storage chamber, V 1-10 : volume of buffer oil, S: the stroke of the piston rod in the front cylinder of the system;
and further obtaining the volume value V of the oil storage chamber 1-7 。
Compared with the prior art, the invention has the beneficial effects that:
(1) The system front cylinder is set to be the system front cylinder, the huge compression ratio and high elasticity of gas in the annular rod cavity of the cylinder barrel of the system front cylinder are fully utilized, when the annular rod cavity buffer oil just enters a working area close to the cylinder cover, the pressure of the gas compressed in the annular rod cavity just enables the pressure of the system front cylinder to be increased to be close to the starting critical pressure of the system rear cylinder, the pressure of the gas compressed in the annular rod cavity is smaller than the pressure required by opening the check valve, and further, when the annular rod cavity buffer oil just begins to work, the system rear cylinder is synchronously started, the piston head at one end of the piston rod is not contacted with the cylinder cover, the impact caused by the direct impact of the piston head and the cylinder cover when the system front cylinder and the system rear cylinder are switched is greatly reduced, smooth switching between the system front cylinder and the system rear cylinder can be realized, the amplitude of shaking of a forklift is further reduced to a great extent, and the comfort of a driver in the driving process is improved;
(2) The buffer oil in the rod cavity of the cylinder barrel can be effectively prevented from leaking into the rodless cavity of the cylinder barrel from the one-way valve arranged on the piston head through the overflow prevention pipe; if the sealing element in the front cylinder of the system fails, and the buffer oil in the annular rod cavity of the cylinder is too much and the generated pressure is larger, the redundant buffer oil in the annular rod cavity can be discharged into the rodless cavity of the cylinder through the one-way valve;
(3) When the cylinder is used for a period of time, the gas leakage causes that the gas in the rod cavity is too little and the pressure is too small, and the gas supplementing screw arranged on one side of the cylinder barrel is opened, so that the rod cavity is communicated with the atmosphere to supplement gas automatically, and the normal use of the front cylinder of the system is ensured;
(4) By reasonably designing the volume value of the oil storage chamber, when the front cylinder of the system works, the large compression ratio and high elasticity of gas can be utilized to realize smooth switching between the front cylinder of the system and the rear cylinder of the system, so that the problem of 'blow-by' is avoided when the volume design of the space of the oil storage chamber is excessively small, and the volume of the oil storage chamber is excessively small, so that the pressure of the gas in the closed rod cavity of the cylinder barrel after being compressed is excessively large to open the one-way valve, and the gas in the annular rod cavity is discharged into the rodless cavity of the cylinder barrel through the one-way valve to lose effect; the hydraulic shock switching device has the advantages that when the space volume of the oil storage chamber is designed to be too large, the front cylinder of the system can only completely rely on the buffer oil in the annular rod cavity of the cylinder barrel of the front cylinder of the system, the switching hydraulic shock between the front cylinder of the system and the rear cylinder of the system is generated, the shaking of the door frame is caused, the comfort of a driver is affected, and meanwhile, the processing cost of the whole system is also improved, and the use effect of the whole system is affected.
Drawings
FIG. 1 is a schematic diagram of a gas-liquid double-medium buffer cylinder without a gas supplementing screw;
fig. 2 is a schematic diagram of a gas-liquid double-medium buffer cylinder structure provided with a gas supplementing screw.
In the figure:
1-1 parts of cylinder cover, 1-2 parts of cylinder barrel, 1-3 parts of piston rod, 1-4 parts of piston head, 1-5 parts of one-way valve, 1-6 parts of overflow-proof pipe, 1-7 parts of oil storage chamber, 1-8 parts of backflow hole, 1-9 parts of throttle hole, 1-10 parts of buffer oil, 1-11 parts of air supplementing screw, 1-12 parts of throttle oil duct, 1-13 parts of mounting hole.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a gas-liquid dual-medium buffer cylinder comprises a cylinder barrel 1-2, a cylinder cover 1-1, a piston rod 1-3 and a piston head 1-4 arranged at one end of the piston rod, wherein the piston rod 1-3 drives the piston head 1-4 to move along the axial direction of the cylinder barrel 1-2; the annular rod cavity formed by the cylinder barrel 1-2 and the piston rod 1-3 is filled with buffer oil liquid 1-10; one end of the piston rod 1-3 positioned in the cylinder barrel 1-2 is provided with a mounting hole 1-13 for mounting a piston head and an oil storage chamber 1-7 for storing oil in turn along the axial direction, and the tail end of the mounting hole 1-13 is communicated with the oil storage chamber 1-7; the piston rod 1-3 is located at one side of the mounting hole 1-13, an orifice 1-9 and a backflow hole 1-8 are formed along the radial direction, one end of the orifice 1-9 is communicated with a throttle oil duct 1-12 formed transversely on the piston head 1-4, and one end of the backflow hole 1-8 is communicated with the tail end of the mounting hole 1-13 or the oil storage chamber 1-7.
The annular rod cavity of the oil cylinder is a closed space, and a closed gas environment with atmospheric pressure exists in the closed rod cavity of the oil cylinder. When the piston head 1-4 is close to the cylinder cover 1-1 at high speed, the gas compression in the closed annular rod cavity generates gas pressure, namely, when the annular rod cavity buffer oil 1-10 just enters a working area close to the cylinder cover 1-1, the gas pressure in the annular rod cavity after the gas compression just enables the pressure of the front cylinder to be increased to be close to the starting critical pressure of the rear cylinder of the system, the gas pressure after the gas compression in the annular rod cavity is smaller than the pressure required by opening the one-way valve 1-5, the rear cylinder of the system is synchronously started when the annular rod cavity buffer oil 1-10 just begins to work, and the piston head 1-4 at one end of the piston rod 1-3 is not contacted with the cylinder cover 1-1, so that the smooth switching between the front cylinder of the system and the rear cylinder of the system can be realized due to the impact caused by the direct impact of the piston head 1-4 and the rear cylinder of the system when the front cylinder of the system is switched, the driver's comfort in the driving process of a forklift is greatly reduced, and the driving comfort in the driving process is greatly improved.
When the cylinder barrel 1-2 is longitudinally placed and the front system cylinder does not work, the liquid level of the buffer oil liquid 1-10 in the rod cavity of the cylinder barrel 1-2 is lower than the backflow hole 1-8 and higher than the throttle hole 1-9; when the gas in the annular rod cavity is liquefied after being compressed or gas leakage occurs, auxiliary buffering can be performed through the buffer oil 1-10 liquid, and impact caused by collision between the piston head 1-4 and the cylinder cover 1-1 can be reduced to a certain extent.
Referring to fig. 1 and 2, a fixing hole for installing the one-way valve 1-5 and an anti-overflow hole communicated with the tail end of the installation hole 1-13 are sequentially formed in the middle of the piston head 1-4 from one end of the rodless cavity to one end of the rod cavity; the overflow prevention pipe 1-6 is arranged in a section of the overflow prevention hole close to the tail end of the mounting hole 1-13, and one end of the overflow prevention pipe 1-6 extends into the oil storage chamber 1-7.
The buffer oil liquid 1-10 sequentially enters the oil storage chamber 1-7 from the rod cavity of the cylinder barrel 1-2 through the throttle hole 1-9, the throttle oil duct 1-12 and the tail end of the mounting hole 1-13 to form a throttle passage; the buffer oil liquid 1-10 sequentially enters the rod cavity of the cylinder barrel 1-2 from the oil storage chamber 1-7 through the tail end of the mounting hole 1-13 and the reflux hole 1-8 to form a reflux channel.
When the piston head 1-4 approaches the cylinder head 1-1, the backflow hole 1-8 formed on the piston rod 1-3 enters the cylinder head 1-1, and at this time, the buffer oil 1-10 in the annular rod cavity of the cylinder barrel 1-2 sequentially enters the oil storage chamber 1-7 from the throttling hole 1-9 formed on the piston rod 1-3, the throttling oil duct 1-12 and the tail end of the mounting hole 1-13, namely, the buffer oil 1-10 in the annular rod cavity of the cylinder barrel 1-2, pressure difference is generated due to throttling in the process, damping pressure is formed in the rod cavity of the cylinder barrel 1-2, and the pressure of the front cylinder of the system is further improved.
The buffer oil 1-10 in the rod cavity of the cylinder barrel 1-2 can be effectively prevented from leaking into the rodless cavity of the cylinder barrel 1-2 from the one-way valve 1-5 arranged on the piston head 1-4 through the overflow preventing pipe 1-6; if the sealing element in the front cylinder of the system fails, the buffer oil 1-10 in the rodless cavity of the cylinder barrel 1-2 can leak inwards into the annular rod cavity of the cylinder barrel 1-2, and when the buffer oil 1-10 accumulated in the annular rod cavity of the cylinder barrel 1-2 is excessive and the generated pressure is large, the arranged one-way valve 1-5 can be opened in time, so that the redundant buffer oil 1-10 in the annular rod cavity is discharged into the rodless cavity of the cylinder barrel 1-2 through the one-way valve 1-5.
Referring to fig. 2, a threaded hole is formed in a side of the cylinder 1-2, which is close to the rod cavity of the cylinder cover 1-1, and an air supplementing screw 1-11 is installed in the threaded hole.
During normal use, the air supplementing screw 1-11 arranged on one side of the cylinder barrel 1-2 does not need to be opened, so that the rod cavity of the cylinder barrel 1-2 is a closed annular space. When the cylinder barrel 1-2 is used for a period of time, the air leakage causes too little air in the rod cavity and too little pressure, the air supplementing screw 1-11 arranged on one side of the cylinder barrel 1-2 can be opened, so that the rod cavity is communicated with the atmosphere to supplement air automatically, and the normal use of the front cylinder of the system is ensured.
Referring to fig. 1, a buffering method of a gas-liquid dual-medium buffering oil cylinder is disclosed, wherein the gas-liquid dual-medium buffering oil cylinder is a front system cylinder; the volume of the oil storage chamber is reasonably designed, and the oil storage chamber is used for storing gas in a rod cavity of the cylinder barrel and the buffer oil; before the buffer oil in the rod cavity of the cylinder barrel works, the gas compression in the rod cavity of the cylinder barrel is utilized to increase the system pressure, and the gas in the rod cavity enters the oil storage chamber through the backflow hole after being compressed, so that smooth switching between the front cylinder of the system and the rear cylinder of the system is realized.
In order to ensure that the gas pressure generated after the gas in the closed annular rod cavity is compressed is close to the starting critical pressure of the rear cylinder of the system, and the gas pressure after the gas in the annular rod cavity is smaller than the pressure required by opening the one-way valve, the volume of the oil storage chamber arranged in the piston rod needs to be reasonably designed, namely, the oil storage chamber is ensured to have a proper gas storage space during the gas compression, and further, the proper damping pressure is always ensured after the gas compression.
The specific calculation steps of the volume value of the oil storage chamber are as follows:
s1, calculating the upper limit of air pressure when the air in the cylinder barrel sealed rod cavity is compressed;
in the step S1, the upper limit of the air pressure when the air in the rod cavity of the cylinder is compressed is calculated, and the following conditions are satisfied:
in condition 1, the pressure of the compressed gas in the cylinder barrel sealed with the rod cavity can not open the one-way valve, namely
Condition 2, before the compression of the gas in the closed rod cavity of the cylinder barrel is finished, the reaction pressure, the normal working pressure and the along-the-way pressure loss formed in the rodless cavity of the cylinder barrel are equal to the starting pressure of the rear cylinder of the system, namely
Wherein P is Air-conditioner : air pressure at the time of front cylinder gas compression, P Front cylinder : working pressure of front cylinder, P Rear cylinder : working pressure of rear cylinder, P 1-5 : opening pressure of the check valve, Δp: the pressure loss along the way of a communication pipeline between the front cylinder and the rear cylinder of the system; d (D) 1-2 : inner diameter of cylinder barrel D 1-3 : diameter of the piston rod.
Obtaining the upper pressure limit after gas compression according to the formula (1) obtained in the condition 1 and the formula (2) obtained in the condition 2, namely, obtaining the upper pressure limit after gas compression as the minimum pressure value calculated by the formula (1) and the formula (2), namely, obtaining the pressure P after gas compression Air-conditioner The following should be satisfied at the same time:
and->
S2, calculating the volume value of the oil storage chamber according to the Boyle gas equation and the volume relation between the compressed air pressure and the oil storage chamber.
In the step S2, according to the boyle gas equation, the following formula is obtained from the volume relationship between the compressed air pressure and the oil storage chamber:
wherein P is Atmospheric air : atmospheric pressure, V 1-7 : volume of oil storage chamber, V 1-10 : volume of buffer oil, S: the stroke of the piston rod in the front cylinder of the system;
and further obtaining the volume value V of the oil storage chamber 1-7 。
For example: current cylinder operating pressure P Front cylinder Is 1.2MPa and the working pressure P of the rear cylinder Rear cylinder The pressure loss delta P along the way of a communication pipeline between a front cylinder and a rear cylinder of the system is 2MPa, and the pressure loss delta P along the way is 0.5MPa, and the opening pressure P of a one-way valve is 1-5 1.0MPa, atmospheric pressure P Atmospheric air 0.1MPa;
inner diameter D of cylinder barrel 1-2 Diameter D of 75mm and piston rod 1-3 55mm;
volume V of oil storage chamber 1-7 Is 339254.5mm 3 Volume V of buffer oil 1-10 51000mm 3 ；
The stroke S of the piston rod in the front cylinder of the system is 800mm.
S1, calculating the upper limit of the air pressure during the air compression in the cylinder closed rod cavity, and obtaining the air pressure P during the air compression of the front cylinder according to the condition 1 Air-conditioner 4.090909MPa or less and the air pressure P at the time of compressing the front cylinder gas obtained according to the condition 2 Air-conditioner 0.649038MPa; finally, the upper limit of the air pressure when the air in the cylinder barrel sealed rod cavity is compressed is obtained to be P Air-conditioner ＝0.649038MPa。
S2, according to the Boyle gas equation and the volume relation between the compressed air pressure and the oil storage chamber,
calculating the volume V of the oil storage chamber 1-7 ＝339254.5mm 3 。
Calculating the volume V of the oil storage chamber through the steps S1 and S2 1-7 When the piston head is close to the cylinder cover at high speed, the gas in the closed annular rod cavity is compressed to generate gas pressure, the compressed gas pressure just enables the pressure of the front cylinder of the system to be increased to be close to the starting critical pressure of the rear cylinder of the system, and the gas pressure of the annular rod cavity after the gas compression is smaller than the pressure required by opening the one-way valve.
When the volume of the oil storage chamber is designed to be too small, namely the air in the annular rod cavity is not completely compressed, a part of the piston rod of the front cylinder of the system extends outwards, the rear cylinder of the system begins to work, and the problem of 'blow-by' can occur; and if the volume of the oil storage chamber is too small, the pressure of the compressed gas in the closed rod cavity of the cylinder barrel is too large to open the one-way valve, and the gas in the annular rod cavity can be discharged into the rodless cavity of the cylinder barrel through the one-way valve, so that the cylinder barrel is disabled.
When the space volume of the oil storage chamber is designed to be too large, the gas pressure after gas compression is far smaller than the starting critical pressure of the rear cylinder of the system, namely the front cylinder of the system can only completely rely on the buffer oil in the annular rod cavity of the cylinder barrel of the front cylinder of the system; when the piston head is close to the cylinder cover at high speed, the buffer oil can be instantaneously collided with the cylinder cover and can be regarded as rigid collision, then a backflow hole formed in the piston rod enters the cylinder cover, the buffer oil in the annular rod cavity can only enter the oil storage chamber from the throttle hole through the throttle channel to generate damping effect, the process needs too short, the establishment process of the pressure of the rear cylinder of the system is also very short, and the two processes almost synchronously act, so that switching hydraulic impact between the front cylinder of the system and the rear cylinder of the system can be generated at the moment, portal shaking is caused, the comfortableness of a driver is influenced, and meanwhile, the processing cost of the whole system is also improved, and the use effect of the whole system is influenced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (6)
1. The buffer method based on the gas-liquid double-medium buffer cylinder comprises a system front cylinder and a system rear cylinder, wherein the system front cylinder is the gas-liquid double-medium buffer cylinder; the method is characterized in that:
the gas-liquid double-medium buffer oil cylinder comprises a cylinder barrel (1-2), a cylinder cover (1-1), a piston rod (1-3) and a piston head (1-4) arranged at one end of the piston rod, wherein the piston rod (1-3) drives the piston head (1-4) to move along the axial direction of the cylinder barrel (1-2); a buffer oil liquid (1-10) is filled in an annular rod cavity formed by the cylinder barrel (1-2) and the piston rod (1-3);
one end of the piston rod (1-3) positioned in the cylinder barrel (1-2) is provided with a mounting hole (1-13) for mounting a piston head and an oil storage chamber (1-7) for storing oil in sequence along the axial direction, and the tail end of the mounting hole (1-13) is communicated with the oil storage chamber (1-7);
an orifice (1-9) and a backflow hole (1-8) are formed in one side of the mounting hole (1-13) along the radial direction, one end of the orifice (1-9) is communicated with a throttling oil duct (1-12) transversely formed in the piston head (1-4), and one end of the backflow hole (1-8) is communicated with the tail end of the mounting hole (1-13) or the oil storage chamber (1-7);
the buffering method comprises the following steps:
the volume of the oil storage chambers (1-7) is reasonably designed, and the oil storage chambers are used for storing gas in the rod cavities of the cylinder barrel and the buffer oil; before the buffer oil in the rod cavity of the cylinder barrel works, the gas compression in the rod cavity of the cylinder barrel is utilized to increase the pressure of the system, so that smooth switching between the front cylinder and the rear cylinder of the system is realized;
the specific calculation steps of the volume value of the oil storage chamber are as follows:
s1, calculating the upper limit of air pressure when the air in the cylinder barrel sealed rod cavity is compressed;
s2, calculating the volume value of the oil storage chamber according to the Boyle gas equation and the volume relation between the compressed air pressure and the oil storage chamber.
2. The buffering method according to claim 1, wherein: the middle part of the piston head (1-4) is sequentially provided with a fixing hole for installing the one-way valve (1-5) and an anti-overflow hole communicated with the tail end of the installing hole (1-13) from one end of the rodless cavity to one end of the rod cavity;
the overflow prevention pipe (1-6) is arranged in a section of the overflow prevention hole close to the tail end of the mounting hole (1-13), and one end of the overflow prevention pipe (1-6) extends into the oil storage chamber (1-7).
3. The buffering method according to claim 2, characterized in that: the buffer oil (1-10) sequentially enters the oil storage chamber (1-7) from the rod cavity of the cylinder barrel (1-2) through the throttle hole (1-9), the throttle oil duct (1-12) and the tail end of the mounting hole (1-13) to form a throttle channel;
the buffer oil (1-10) sequentially passes through the tail end of the mounting hole (1-13) and the reflux hole (1-8) from the oil storage chamber (1-7) to enter the rod cavity of the cylinder barrel (1-2) to form a reflux channel.
4. A buffering method according to claim 3, characterized in that: threaded holes are formed in one side, close to the rod cavity of the cylinder cover (1-1), of the cylinder barrel (1-2), and air supplementing screws (1-11) are arranged in the threaded holes.
5. The buffering method according to claim 1, wherein: in the step S1, the upper limit of the air pressure when the air in the rod cavity of the cylinder is compressed is calculated, and the following conditions are satisfied:
in condition 1, the pressure of the compressed gas in the cylinder barrel sealed with the rod cavity can not open the one-way valve, namely
Condition 2, before the compression of the gas in the closed rod cavity of the cylinder barrel is finished, the reaction pressure, the normal working pressure and the along-the-way pressure loss formed in the rodless cavity of the cylinder barrel are equal to the starting pressure of the rear cylinder of the system, namely
Wherein P is Air-conditioner : air pressure, P, during gas compression of the front cylinder of the system Front cylinder : working pressure of front cylinder of system, P Rear cylinder : working pressure of rear cylinder of system, P 1-5 : opening pressure of the check valve, Δp: the pressure loss along the way of a communication pipeline between the front cylinder and the rear cylinder of the system; d (D) 1-2 : inner diameter of cylinder barrel D 1-3 : diameter of the piston rod.
6. The buffering method of claim 5, wherein: in the step S2, according to the boyle gas equation, the following formula is obtained from the volume relationship between the compressed air pressure and the oil storage chamber:
wherein P is Atmospheric air : atmospheric pressure, V 1-7 : volume of oil storage chamber, V 1-10 : volume of buffer oil, S: the stroke of the piston rod in the front cylinder of the system;
and further obtaining the volume value V of the oil storage chamber 1-7 。
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