CN205001279U - Pneumatic cylinder and have engineering machinery of this pneumatic cylinder - Google Patents
Pneumatic cylinder and have engineering machinery of this pneumatic cylinder Download PDFInfo
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- CN205001279U CN205001279U CN201520508550.4U CN201520508550U CN205001279U CN 205001279 U CN205001279 U CN 205001279U CN 201520508550 U CN201520508550 U CN 201520508550U CN 205001279 U CN205001279 U CN 205001279U
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Abstract
The utility model discloses a pneumatic cylinder and have engineering machinery of this pneumatic cylinder. The utility model discloses a pneumatic cylinder, its include the oil pocket, with the business turn over hydraulic fluid port and the main buffering portion of oil pocket intercommunication, main buffering portion is used for slowing down when setting for buffer area the velocity of movement of piston at the piston motion of pneumatic cylinder, it is still including buffering pressure control mechanism, buffering pressure control mechanism includes a pressure control valve, a pressure control valve was opened in order to feed through the oil pocket through a pressure control valve and to pass in and out the hydraulic fluid port when pressure in the oil pocket was more than or equal to first buffering pressure setting value. Based on the utility model discloses a when pneumatic cylinder, pressure in the oil pocket were more than or equal to first buffering pressure setting value, a pressure control valve opened for the hydraulic oil that is sealed in the oil pocket can flow out through a pressure control valve, and so as to effectively reduces the pressure value in the oil pocket, makes the pneumatic cylinder have higher buffering reliability, avoids the high -pressure harm that leads to the fact the pneumatic cylinder structure.
Description
Technical field
The utility model relates to oil hydraulic cylinder buffer technology field, particularly a kind of oil hydraulic cylinder and have the engineering machinery of this oil hydraulic cylinder.
Background technique
The workpiece run-of-the-mill that the oil hydraulic cylinder of engineering machinery drives is comparatively large, movement velocity is very fast, when piston movement has higher speed usually to during limit position, due to effect of inertia, piston can cause greater impact to cylinder bottom or cylinder bottom, affect operating accuracy, even may damage oil hydraulic cylinder.In order to solve this shock problem, generally buffer structure is set in oil hydraulic cylinder.
The working principle of buffer structure is: when piston runs to terminal distance the last period (cushion stroke), all or part of hydraulic oil shutoff in oil-discharging cavity (buffer cavity) can be got up by buffer structure, hydraulic oil is forced to flow out from gap or throttling pore, thus increase the oil extraction resistance (compensator or trimmer pressure) of hydraulic oil, offset with the inertial force of piston, to slow down the movement velocity of piston.
Existing buffer structure is divided into rod chamber buffer structure and the large class of rodless cavity buffer structure two, and it is all realize buffering by throttle chink usually.For rod chamber buffer structure, current a kind of conventional structural type reaches buffering object by the matching gap between cushion collar and guide sleeve, this matching gap forms the oil duct with less flow area between cylinder rod chamber and the corresponding oil inlet and outlet of oil cylinder, under the damping function in this gap, piston rod stretches out speed to be reduced, and the pressure simultaneously in cylinder rod chamber raises.And in order to reduce the pressure maximum (compensator or trimmer pressure peak value) in buffering course in cylinder rod chamber, usually on guide sleeve, offer throttle orifice at present simultaneously, or the throttling groove that multiple flow area changes with buffering is set on the piston rod, thus liquid flow channel for oil is formed between cylinder rod chamber and oil cylinder outlet, to improve cushioning effect, reduce compensator or trimmer pressure peak value.And rodless cavity buffer structure, its conventional a kind of structural type is the speed that the throttle chink formed by the gap between buffer plunger and cylinder bottom center hole reduces piston when piston rod is retracted, and realizes buffering object.
Above-mentioned buffer structure is widely used, and has certain buffer function, but it easily causes the compensator or trimmer pressure in oil hydraulic cylinder too high, namely causes occurring larger compensator or trimmer pressure peak value in oil hydraulic cylinder, buffering poor reliability.Although at present offer throttle orifice on guide sleeve or piston rod or throttling groove can reduce compensator or trimmer pressure peak value to a certain extent, but its effect is unsatisfactory, especially, when there is instantaneous high pressure or continuous high-pressure in oil-discharging cavity, it still cannot guarantee to meet shock-absorbing capacity requirement.And offer throttle orifice on the piston rod, difficulty of processing is large, and cost is high, poor for large-tonnage engineering machinery hydraulic cylinder applicability.
And, realize for the above-mentioned throttle chink utilizing matching gap to be formed the buffer structure cushioning object, it has higher requirement to the precision of matching gap, and this adds difficulty of processing on the one hand, on the other hand also very easily because matching gap value is chosen not rationally, and cause potential safety hazard.For above-mentioned rod chamber buffer structure, it reaches buffering object by the matching gap between guide sleeve and cushion collar, therefore, require very high to the machining accuracy of cushion collar and guide sleeve and quality of fit thereof, this considerably increases difficulty of processing, especially for large-scale engineering machinery (such as large excavator), due to its cushion collar and guide sleeve structure size larger, in part processing precision with the guarantee of buffering matching gap precision, difficulty is larger, very easily occur that buffer gap does not reach designing requirement, the situation of shock-absorbing capacity cannot be ensured; And the buffer gap of high quality of fit very easily occurs that cushion collar cannot enter the damping mechanism fault of guide sleeve, in addition, if it is reasonable not that above-mentioned matching gap value is chosen, very easily cause in cylinder rod chamber and occur instantaneous high pressure or continuous high-pressure, cylinder structure is caused damage, reduce oil cylinder working life, and there is potential safety hazard.
In addition, the volume of large-tonnage Cylinders of Construction Machinery, weight, mounting torque are all comparatively large, dismantle inconvenience after installation, change component difficulty.And based on existing buffer structure, if its cushioning effect is undesirable, can only change, and cannot at the enterprising Row sum-equal matrix of original structure, very flexible, simultaneously, large-tonnage Cylinders of Construction Machinery cost of production is high, and output is little, and the dismounting of component will cause larger economic loss with replacing.
Model utility content
A technical problem to be solved in the utility model is: the buffer structure of existing oil hydraulic cylinder cannot effectively control compensator or trimmer pressure peak value, buffering poor reliability.
In order to solve the problems of the technologies described above, the utility model provides a kind of oil hydraulic cylinder and has the engineering machinery of this oil hydraulic cylinder.
Oil hydraulic cylinder provided by the utility model, it comprises oil pocket, the oil inlet and outlet be communicated with oil pocket and host buffer portion, host buffer portion is used for slowing down the movement velocity of piston at the piston movement of oil hydraulic cylinder to when setting buffer area, it also comprises compensator or trimmer pressure control mechanism, compensator or trimmer pressure control mechanism comprises the first pressure controlled valve, and when the pressure in oil pocket is more than or equal to the first compensator or trimmer pressure setting value, the first pressure controlled valve opens to be communicated with oil pocket and oil inlet and outlet by the first pressure controlled valve.
Alternatively, first oil outlet of the first pressure controlled valve is communicated with oil inlet and outlet, first filler opening of the first pressure controlled valve is communicated with oil pocket, and whether the first spool of the first pressure controlled valve is communicated with the first oil outlet for controlling the first filler opening, and the first oil outlet is multiple first oil throughs.
Alternatively, first pressure controlled valve interior separation is the first valve pocket and the second valve pocket by the first spool of the first pressure controlled valve, first valve pocket is communicated with oil inlet and outlet by the first oil outlet of the first pressure controlled valve, whether the first spool is communicated with the first filler opening of the first pressure controlled valve for controlling the second valve pocket, first filler opening is communicated with oil pocket, and the first valve pocket is communicated with by through-flow oil duct with the second valve pocket.
Alternatively, the first pressure controlled valve comprises the first valve body, and the first spool of the first pressure controlled valve is arranged in the first valve body, and through-flow oil duct is arranged on the first spool and/or the first valve body.
Alternatively, compensator or trimmer pressure control mechanism also comprises the second pressure controlled valve, this second pressure controlled valve is set to: when the pressure after the first pressure controlled valve is opened in oil pocket still continues to be more than or equal to the first compensator or trimmer pressure setting value, and the second pressure controlled valve opens to be communicated with oil pocket and oil inlet and outlet by the second pressure controlled valve; Or when the pressure in oil pocket is more than or equal to the second compensator or trimmer pressure setting value, the second pressure controlled valve opens to be communicated with oil pocket and oil inlet and outlet by the second pressure controlled valve, and the second compensator or trimmer pressure setting value is greater than the first compensator or trimmer pressure setting value.
Alternatively, second pressure controlled valve and the first pressure controlled valve are combined to form type pilot pressure controlled valve, first pressure controlled valve is used as the pilot valve of the second pressure controlled valve, when pressure after the first pressure controlled valve is opened in oil pocket still continues to be more than or equal to the first compensator or trimmer pressure setting value, the second pressure controlled valve is opened.
Alternatively, second pressure controlled valve interior separation is the 3rd valve pocket and the 4th valve pocket by the second spool of the second pressure controlled valve, described 4th valve pocket is communicated with oil inlet and outlet by the second oil outlet of the second pressure controlled valve, whether the second spool is communicated with the second filler opening of the second pressure controlled valve for controlling the 4th valve pocket, second filler opening is communicated with oil pocket, 3rd valve pocket is communicated with the first filler opening of the first pressure controlled valve, and the first filler opening is communicated with oil pocket by the first damping unit.
Alternatively, the first damping unit is throttle orifice or throttling groove.
Alternatively, the second oil outlet is multiple second oil throughs.
Alternatively, the first pressure controlled valve is relief valve, and/or the second pressure controlled valve is relief valve.
Alternatively, oil pocket is rod chamber and/or rodless cavity.
Alternatively, oil pocket is rod chamber, and host buffer portion comprises the guide sleeve coordinated with the piston rod of oil hydraulic cylinder, and compensator or trimmer pressure control mechanism is removably disposed on guide sleeve; And/or oil pocket is rodless cavity, compensator or trimmer pressure control mechanism is removably disposed on the cylinder bottom of oil hydraulic cylinder.
Alternatively, oil hydraulic cylinder also comprises throttling oil duct, and throttling oil duct is communicated with oil pocket and oil inlet and outlet.
Alternatively, throttling oil duct is throttle orifice or throttling groove.
Engineering machinery provided by the utility model, it comprises as above arbitrary oil hydraulic cylinder.
Based on the oil hydraulic cylinder that the utility model provides, its compensator or trimmer pressure control mechanism comprises the first pressure controlled valve, this first pressure controlled valve can be opened when being more than or equal to the first compensator or trimmer pressure setting value by the pressure in oil pocket, the hydraulic oil be closed in oil pocket can be flowed out by this first pressure controlled valve, thus the force value that can effectively reduce in oil pocket, make oil hydraulic cylinder of the present utility model have higher buffering reliability, the infringement that high pressure causes hydraulic cylinder structure can be avoided.
Meanwhile, compensator or trimmer pressure control mechanism of the present utility model is applied to the oil hydraulic cylinder utilizing throttle clearance to realize buffering object, its requirement to throttle clearance value precision can also be reduced, reduce difficulty of processing, improve its buffering reliability further.
In addition, the utility model adopts integrated modular design, inner integrated first pressure controlled valve and/or the second pressure controlled valve, can carry out adjusting to the first pressure controlled valve and/or the second pressure controlled valve easily according to different buffer requirements and set like this, to reach more desirable cushioning effect, flexibility is higher, and is convenient to change, and can effectively reduce costs.
By referring to the detailed description of accompanying drawing to exemplary embodiment of the present utility model, further feature of the present utility model and advantage thereof will become clear.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 illustrates the structure sectional view of the utility model first embodiment.
Fig. 2 illustrates the I partial enlarged drawing of Fig. 1.
Fig. 3 A, Fig. 3 B illustrate plan view and the left view of the first relief valve spool structure in Fig. 1.
Fig. 4 illustrates the structure sectional view of the utility model second embodiment.
Fig. 5 shows the II partial enlarged drawing of Fig. 4.
In figure:
1, guide sleeve; 101, the first damping unit; 102, the first oil duct; 103, the second plug; 104, the second oil duct; 106, the 3rd plug;
2, the first pressure controlled valve; 201, the first plug; 202, the first elastic member; 203, the first valve pocket; 204, the first valve body; 205, through-flow oil duct; 206, the first spool; 207, the second valve pocket; P1, the first filler opening; T1, the first oil outlet;
3, the second pressure controlled valve; 301, end cap; 302, the second elastic member; 303, the 3rd valve pocket; 304, the second valve body; 305, the 3rd oil duct; 306, the second spool; 307, the 4th valve pocket; 308, end cap oil duct; P2, the second filler opening; T2, the second oil outlet;
4, throttling oil duct; 5, rod chamber; 6, cylinder barrel; 7, cushion collar; 8, piston; 9, piston rod; 10, oil inlet and outlet; 11, rodless cavity; 12, cylinder bottom; 13, buffer plunger.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technological scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in the appropriate case, described technology, method and apparatus should be regarded as a part of authorizing specification.
In description of the present utility model, it will be appreciated that, the noun of locality is as " front, after, on, under, left, right ", " laterally, vertically, vertically, level " and " top, the end " etc. indicated orientation or position relationship normally based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, when not doing contrary explanation, these nouns of locality do not indicate and imply the device of indication or element must have specific orientation or with specific azimuth configuration and operation, therefore the restriction to the utility model protection domain can not be interpreted as, the noun of locality " inside and outside " refers to inside and outside the profile relative to each parts itself.
In description of the present utility model; it will be appreciated that; the word such as " first ", " second " is used to limit component; be only used to be convenient to distinguish corresponding component; as there is no Stated otherwise; above-mentioned word does not have particular meaning, therefore can not be interpreted as the restriction to the utility model protection domain.
Fig. 1 illustrates the structure sectional view of the utility model first embodiment.Fig. 2 illustrates the I partial enlarged drawing of Fig. 1.Fig. 3 A, Fig. 3 B illustrate plan view and the left view of the first relief valve spool structure in Fig. 1.Fig. 4 illustrates the structure sectional view of the utility model second embodiment.Fig. 5 shows the II partial enlarged drawing of Fig. 4.
With reference to Fig. 1, oil hydraulic cylinder provided by the utility model, it comprises oil pocket, the oil inlet and outlet 10 be communicated with oil pocket and host buffer portion, and this host buffer portion is used for the movement velocity slowing down piston 8 when the piston 8 of oil hydraulic cylinder moves to setting buffer area; This oil hydraulic cylinder also comprises compensator or trimmer pressure control mechanism, this compensator or trimmer pressure control mechanism comprises the first pressure controlled valve 2, and when the pressure in oil pocket is more than or equal to the first compensator or trimmer pressure setting value, this first pressure controlled valve 2 opens to be communicated with oil pocket and oil inlet and outlet 10 by this first pressure controlled valve 2.
Oil hydraulic cylinder provided by the utility model, be provided with the compensator or trimmer pressure control mechanism comprising the first pressure controlled valve 2, like this in buffering course, when the pressure in oil pocket is more than or equal to the first compensator or trimmer pressure setting value, first pressure controlled valve 2 is opened, so the hydraulic oil be closed in oil pocket can flow to oil inlet and outlet 10 by this first pressure controlled valve 2, make under Pressure Drop to the first compensator or trimmer pressure value in oil pocket, thus effectively suppress the compensator or trimmer pressure peak value in oil pocket, therefore, oil hydraulic cylinder of the present utility model has higher buffering reliability, its infringement that compensator or trimmer pressure peak value too high in oil pocket can be avoided to cause hydraulic cylinder structure, to extend the working life of oil hydraulic cylinder, reduce potential safety hazard.First compensator or trimmer pressure setting value of the present utility model is the oil pocket force value determined according to the highest compensator or trimmer pressure designing requirement, this compensator or trimmer pressure setting value is not usually higher than the maximum cushioning pressure that oil hydraulic cylinder can bear, generally be set smaller than this maximum cushioning pressure, to guarantee that oil hydraulic cylinder can normally, safely work.
Those skilled in the art are understood that; host buffer portion of the present utility model; can utilize throttle chink to realize buffering object, other structural types such as throttle orifice of the prior art, peripheral hardware throttle valve also can be utilized to realize cushioning object, and these are all within protection domain of the present utility model.Next will be described the utility model in conjunction with utilizing throttle chink to realize buffering object two embodiments.
Fig. 1 shows the structural representation of the utility model first embodiment.In this embodiment, oil hydraulic cylinder comprises cylinder barrel 6, piston rod 9 and piston 8, and cylinder barrel 6 is divided into two chambeies by piston 8, wherein has one end of piston rod 9 to be called rod chamber 5, one end of piston-rodless 9 is called rodless cavity 11, and rod chamber 5 and rodless cavity 11 have oil inlet and outlet 10 respectively.
In this embodiment, host buffer portion realizes rod chamber buffering by throttle chink, and it comprises guide sleeve 1 and cushion collar 7.As shown in Figure 1, the piston rod 9 that guide sleeve 1 is arranged at rod chamber 5 stretches out one end, guide sleeve 1 is provided with center hole, this center hole coordinates with piston rod 9, when when piston rod 9 is protruding, piston 8 not yet moves to buffer area, the hydraulic oil in rod chamber 5 flows to the oil inlet and outlet 10 be communicated with rod chamber 5 via the center hole on guide sleeve 1; Cushion collar 7 is arranged on piston rod 9, it is Spielpassung between the center hole of cushion collar 7 and guide sleeve 1, like this when piston rod 9 is protruding and piston 8 moves to setting buffer area, cushion collar 7 inserts in the center hole of guide sleeve 1, hydraulic oil in rod chamber 5 flows to oil inlet and outlet 10 from the matching gap between guide sleeve 1 and cushion collar 7, therefore, cushion collar 7 reduces flow area, damping function is defined to hydraulic oil, pressure in rod chamber 5 raises, the speed of piston rod 9 reduces, and realizes buffering object.
In this embodiment, the first pressure controlled valve 2 is arranged on guide sleeve 1, to make structure of the present utility model simpler, compact.As shown in Figure 2, first pressure controlled valve 2 comprises the first oil inlet P 1, first oil outlet T1 and the first spool 206, wherein the first oil outlet T1 is communicated with the first pressure controlled valve 2 and oil inlet and outlet 10, first oil inlet P 1 is communicated with rod chamber 5, so the hydraulic oil in rod chamber 5 is acted on the first spool 206 by this first oil inlet P 1.
First pressure controlled valve 2 of the present utility model can comprise the first valve body 204, and now the first oil inlet P 1 and the first oil outlet T1 are arranged on this first valve body 204, and the first pressure controlled valve 2 is wholy set in the corresponding mounting hole of guide sleeve 1; Or this first pressure controlled valve 2 also can not comprise the first valve body 204, and the valve body using the mounting hole on guide sleeve 1 as this first pressure controlled valve 2, now the first oil inlet P 1 and the first oil outlet T1 are arranged on the hole wall of this mounting hole.
See figures.1.and.2, as a kind of mode of execution of the first pressure controlled valve 2, first pressure controlled valve 2 comprises the first valve body 204, first spool 206 and the first elastic member 202 (such as spring), first valve body 204 inner chamber is divided into the first valve pocket 203 and the second valve pocket 207 by the first spool 206, wherein the first elastic member 202 is arranged in the first valve pocket 203, the pressure of the first elastic member 202 is set to open when making the pressure of the first pressure controlled valve 2 in rod chamber 5 be more than or equal to the first compensator or trimmer pressure setting value, first oil inlet P 1 is communicated with rod chamber 5, so the hydraulic oil in rod chamber 5 acts on the first spool 206, whether the first spool 206 is communicated with the second valve pocket 207 for controlling the first oil inlet P 1, when the pressure in rod chamber 5 is lower than the first compensator or trimmer pressure setting value, under the effect of the first elastic member 202 preset pressure, first spool 206 is pressed on the first valve body 204, first pressure controlled valve 2 is in closed condition, and when the pressure in rod chamber 5 is more than or equal to the first compensator or trimmer pressure setting value, the hydraulic fluid pressure acted on the first spool 206 can overcome the preset pressure of the first elastic member 202, so the first spool 206 compresses the first elastic member 202 under the pressure effect of rod chamber 5, first pressure controlled valve 2 is opened, so the hydraulic oil in rod chamber 5 can flow to oil inlet and outlet 10 by the first oil outlet T1, thus the pressure that can effectively reduce in rod chamber 5, suppress compensator or trimmer pressure peak value.
By arranging the first pressure controlled valve 2, effectively can reduce the compensator or trimmer pressure peak value of oil hydraulic cylinder of the present utility model in buffering course, avoid the structure damaging oil hydraulic cylinder because there is high pressure, simultaneously, regulated by the first pressure controlled valve 2 pairs of compensator or trimmer pressures, the required precision to matching gap between cushion collar 7 and guide sleeve 1 can also be reduced, reduce difficulty of processing, avoid in prior art and unreasonable caused cannot meet shock-absorbing capacity requirement because matching gap value is chosen, cushion collar 7 cannot enter the problems such as guide sleeve 1, improve the buffering reliability of oil hydraulic cylinder, especially for the oil hydraulic cylinder of large-tonnage engineering machinery, can significantly cut down finished cost.
First oil outlet T1 is communicated with the first pressure controlled valve 2 and oil inlet and outlet 10, it can for being arranged on one or more first oil throughs on the first valve body 204, in the present embodiment, be provided with multiple first oil through as the first oil outlet T1, be arranged on benefit to be like this, can limit maximum through-flow flow, avoid the speed of piston 8 to undergo mutation, even if the first valve body 204 rotates, still can ensure that the first oil outlet T1 is communicated with oil inlet and outlet 10.
In the present embodiment, as shown in Figure 2, the first oil outlet T1 for being communicated with the first valve pocket 203 and oil inlet and outlet 10, but it should be noted that, the first oil outlet T1 also can be designed as being communicated with the second valve pocket 207 and oil inlet and outlet 10.When the first oil outlet T1 is for being communicated with the first valve pocket 203 with oil inlet and outlet 10, between the first valve pocket 203 and the second valve pocket 207, through-flow oil duct 205 can be set to realize the connection of the two, this is through-flow, and oil duct 205 can be arranged on the first spool 206, also can be arranged on the first valve body 204, or be arranged on the first spool 206 and the first valve body 204 simultaneously, such as, through-flow oil duct 205 is for being arranged on the groove on the first spool 206, the quantity of groove can be one or more, in the present embodiment, with reference to shown in Fig. 3 A and Fig. 3 B, 4 grooves are circumferentially arranged on the first spool 206 evenly and at intervals, like this when the first pressure controlled valve 2 is opened, hydraulic oil in second valve pocket 207 can flow in the first valve pocket 203 by these grooves, and then flow to oil inlet and outlet 10 from the first oil outlet T1, this just make the first pressure controlled valve 2 have comparatively small guide vane time, namely hydraulic oil flow to oil inlet and outlet 10 by the first pressure controlled valve 2, thus the compensator or trimmer pressure that can reduce more timely and effectively in rod chamber 5.
Cannot in the problem of the enterprising Row sum-equal matrix of original structure, very flexible in order to solve existing buffer structure, the first pressure controlled valve 2 of the present utility model can be removable installed on guide sleeve 1.As depicted in figs. 1 and 2, first pressure controlled valve 2 comprises the first plug 201, this first plug 201 is arranged on first valve pocket 203 one end and forms shutoff to the first valve pocket 203, first plug 201 is provided with outside thread, guide sleeve 1 is provided with the tapped hole matched with the first plug 201 outside thread, so removably connecting of the first pressure controlled valve 2 and guide sleeve 1 can be realized by this first plug 201, dismounting can be carried out easily to the first pressure controlled valve 2, reduce debugging and the difficulty safeguarded, and be convenient to change the first elastic member 202 according to different buffer requirements, the component such as the first spool 206 and the first valve body 204, it is made to adapt to the shock-absorbing capacity requirement of various working neatly.Be understandable that; first pressure controlled valve 2 also can be realized by other structural types with removably connecting of guide sleeve 1; such as screw is fixed or is connected and fixed, as long as can realize the two removably connect all in protection domain of the present utility model.
In the further embodiment of the utility model, compensator or trimmer pressure control structure of the present utility model also comprises the second pressure controlled valve 3, this second pressure controlled valve 3 is set to: when the pressure after the first pressure controlled valve 2 is opened in oil pocket still continues to be more than or equal to the first compensator or trimmer pressure setting value, and the second pressure controlled valve 3 opens to be communicated with oil pocket and oil inlet and outlet 10 by this second pressure controlled valve 3; Or when the pressure in oil pocket is more than or equal to the second compensator or trimmer pressure setting value, this second pressure controlled valve 3 opens to be communicated with oil pocket by this second pressure controlled valve 3 and oil inlet and outlet 10, second compensator or trimmer pressure setting value is greater than the first compensator or trimmer pressure setting value.
Based on this further embodiment, the instantaneous appearance of oil pocket internal pressure one be more than or equal to there is continuous high-pressure in the extremely high value of the second compensator or trimmer pressure setting value or oil pocket time, first pressure controlled valve 2 and the second pressure controlled valve 3 can act synergistically to suppress compensator or trimmer pressure peak value, pressure in oil pocket is down under the first compensator or trimmer pressure setting value quickly or more reposefully, thus improves buffering reliability of the present utility model further.
As a kind of embodiment of this embodiment, second pressure controlled valve 3 can be arranged independent of the first pressure controlled valve 2, open when the pressure of the second pressure controlled valve 3 in oil pocket is more than or equal to the second compensator or trimmer pressure setting value, namely the cracking pressure of the second pressure controlled valve 3 is set as the cracking pressure higher than the first pressure controlled valve 2, compensator or trimmer pressure like this in oil pocket is instantaneous reaches an extremely high value (being more than or equal to the second compensator or trimmer pressure setting value), when first pressure controlled valve 2 independent role can not effectively suppress the pressure in oil pocket in time, second pressure controlled valve 3 can be opened with the first pressure controlled valve 2 simultaneously, increase through-flow flow, comparatively rapidly by below Pressure Drop to the first compensator or trimmer pressure setting value in oil pocket.
As the another kind of embodiment of this embodiment, see figures.1.and.2, second pressure controlled valve 3 and the first pressure controlled valve 2 are combined to form type pilot pressure controlled valve, wherein the first pressure controlled valve 2 is used as the pilot valve of the second pressure controlled valve 3, when pressure after the first pressure controlled valve 2 is opened in oil pocket still continues to be more than or equal to the first compensator or trimmer pressure setting value, this second pressure controlled valve 3 is opened.In oil pocket, there is continuous high-pressure like this, the first pressure controlled valve 2 to open after a period of time still cannot by below Pressure Drop to the first compensator or trimmer pressure setting value in oil pocket time, the second pressure controlled valve 3 is opened, and the two acting in conjunction reduces the force value in oil pocket.Detailed process is still described for rod chamber throttle chink buffering:
Second pressure controlled valve 3 of the present utility model can comprise the second valve body 304, second spool 306, second elastic member 302 (such as spring), second oil inlet P 2 and the second oil outlet T2, second valve body 304 inner chamber is divided into the 3rd valve pocket 303 and the 4th valve pocket 307 by the second spool 306, second elastic member 302 is arranged in the 3rd valve pocket 303, second oil inlet P 2 and the second oil outlet T2 are arranged on the second valve body 304, wherein the second oil outlet T2 is communicated with the 3rd valve pocket 303 and oil inlet and outlet 10, second oil inlet P 2 is communicated with rod chamber 5 to make the hydraulic oil in rod chamber 5 act on the second spool 306, whether the second spool 306 is communicated with the second oil inlet P 2 for controlling the 4th valve pocket 307, when the second pressure valve 3 is opened, the 4th valve pocket 307 can be communicated with rod chamber 5 by this second oil inlet P 1 like this.
As shown in Figure 2, as a kind of mode of execution of type pilot pressure controlled valve, second pressure controlled valve 3 is also arranged on guide sleeve 1, and its 3rd valve pocket 303 is communicated with the first oil inlet P 1 of the first pressure controlled valve 2, and this first oil inlet P 1 is then communicated with rod chamber 5 by the first damping unit 101.
Based on this embodiment, when the pressure in rod chamber 5 is lower than the first compensator or trimmer pressure setting value, when first pressure controlled valve 2 cuts out, hydraulic oil in rod chamber 5 acts on the first spool 206, enter the 3rd valve pocket 303 acts on the second spool 306 simultaneously, now owing to there is no running of hydraulic power oil in the first damping unit 101, the hydraulic oil pressure force value at the first damping unit 101 two ends is equal, force value in 3rd valve pocket 303 is equal with the force value in rod chamber 5, so under the effect of the second elastic member 302 pre set force, second spool 306 is pressed on the second valve body 304, second pressure controlled valve 3 is in closed condition equally, and when the pressure in rod chamber 5 is more than or equal to the first compensator or trimmer pressure setting value, when first pressure controlled valve 2 is opened, hydraulic oil in rod chamber 5 is by the first damping unit 101, first pressure controlled valve 2 flows to oil inlet and outlet 10, first damping unit 101 pairs hydraulic oil produces damping function, the hydraulic oil at the first damping unit 101 two ends is made to produce pressure difference, thus cause pressure in the 3rd valve pocket 303 lower than the pressure in rod chamber 5, so when the pressure durations in rod chamber 5 is higher than the first compensator or trimmer pressure setting value, along with the hydraulic oil in rod chamber 5 constantly enters the second oil inlet P 2, hydraulic oil is squeezed, the pressure at the second oil inlet P 2 place increases thereupon, the pressure difference acting on the second spool 306 two ends also increases thereupon, when this pressure difference is large enough to the pre set force that can overcome the second elastic member 302, hydraulic oil in rod chamber 5 promotes the second spool 306 and compresses the second elastic member 302 and move, second pressure controlled valve 3 is opened, hydraulic oil in rod chamber 5 flows to oil inlet and outlet 10 by the second pressure controlled valve 3, reduce the force value in rod chamber 5, thus realize effectively suppressing the continuous high-pressure in rod chamber 5.
First damping unit 101 of the present utility model can be throttle orifice, damping hole or throttling groove etc., as long as it can produce damping function when hydraulic oil therefrom flows to hydraulic oil.In the embodiment shown in Figure 2, the first damping unit 101 is throttle orifice, and the 3rd valve pocket 303 is communicated with this throttle orifice by the 3rd oil duct 305 be arranged on guide sleeve 1.
Second oil outlet T2 is communicated with the 4th valve pocket 307 and the oil inlet and outlet 10 of the second pressure controlled valve 3, it can for being arranged on one or more second oil throughs on the second valve body 304, in the present embodiment, be provided with multiple second oil through as the second oil outlet T2, the benefit of such setting is, maximum through-flow flow under continuous high-pressure condition can be limited, while control piston 8 speed, the maximum pressure drop speed of effective control oil pocket, ensure that it realizes steadily buffering, even if the second valve body 304 rotates, still can ensure that this second oil outlet T2 is communicated with oil inlet and outlet 10.
Cannot in the problem of the enterprising Row sum-equal matrix of original structure, very flexible in order to solve existing buffer structure, the second pressure controlled valve 3 of the present utility model can be removable installed on guide sleeve 1.As depicted in figs. 1 and 2, second pressure controlled valve 3 comprises end cap 301, this end cap 301 is arranged on the 4th valve pocket 307 one end, this end cap 301 is provided with outside thread, guide sleeve 1 is provided with the tapped hole matched with this end cap 301 outside thread, so removably connecting of the second pressure controlled valve 3 and guide sleeve 1 can be realized by this end cap 301, be convenient to carry out dismounting to the second pressure controlled valve 3, reduce debugging and the difficulty safeguarded, and be convenient to change the second elastic member 302 according to different buffer requirements, the component such as the second spool 306 and the second valve body 304, it is made to adapt to the shock-absorbing capacity requirement of various working neatly.Be understandable that; second pressure controlled valve 3 also can be realized by other structural types with removably connecting of guide sleeve 1; such as screw is fixed or is connected and fixed, as long as can realize the two removably connect all in protection domain of the present utility model.As shown in Figure 2, in order to realize being communicated with of the second oil inlet P 2 and rod chamber 5, end cap 301 is provided with end cap oil duct 308.
As shown in Figure 2, first pressure controlled valve 2 of the present utility model is arranged along the radial direction of guide sleeve 1, the axis of the second pressure controlled valve 3 along guide sleeve 1 is arranged, but those skilled in the art are understood that, the set-up mode of the first pressure controlled valve 2 and the second pressure controlled valve 3 is not limited thereto, and certainly, arranges according to shown in Fig. 2, be convenient to install two pressure controlled valves and dismantle on the one hand, also make structure of the present utility model more simply compact on the other hand.
Based on the set-up mode of Fig. 2, guide sleeve 1 is provided with the first oil duct 102 and the second oil duct 104, wherein: the first oil duct 104 is for being communicated with the first oil outlet T1 and oil inlet and outlet 10, first oil duct 102 is communicated with to realize being communicated with of the second oil outlet T2 and oil inlet and outlet 10 with the second oil duct 104, such oil circuit is arranged so that structure of the present utility model is compacter, oil circuit is simpler.
In order to make the processing of above-mentioned oil duct convenient, the second oil duct 104 is the through hole axially arranged along guide sleeve 1, and one end that itself and cylinder barrel 6 lean is provided with the second plug 103 and reveals to prevent hydraulic oil; First oil duct 102 is arranged along guide sleeve 1 radial direction, its bottom is communicated with the second oil outlet T2 of the second pressure controlled valve 3, its top is then positioned on the radial end face of guide sleeve 1, second oil duct 104 divides the connection of both crossing realizations therebetween with the first oil duct 102, be provided with the 3rd plug 106 on the top of the first oil duct 102 to reveal to prevent hydraulic oil, the 3rd plug 106 removably (such as can be threaded) and be fixed on guide sleeve 1.
Second pressure controlled valve 3 of the present utility model and the first pressure controlled valve 2 form type pilot pressure controlled valve, like this when oil pocket instantaneous pressure is more than or equal to the first compensator or trimmer pressure setting value, the first pressure controlled valve 2 as pilot valve is opened, and suppresses compensator or trimmer pressure peak value; And when oil pocket is in continuous high-pressure operating mode; the first pressure controlled valve 2 as pilot valve and the second pressure controlled valve 3 as main valve are opened jointly; suppress compensator or trimmer pressure peak value; hydraulic cylinder structure can not only be protected; and the required precision that reduce further matching gap value; reduce difficulty of processing, improve the buffering reliability of oil hydraulic cylinder.In addition, the utility model adopts integrated modular design, can carry out adjusting to the first pressure controlled valve 2 and the second pressure controlled valve 3 easily according to different buffer requirements and set, to reach more desirable cushioning effect.
Further, in the various embodiments described above, oil hydraulic cylinder can also comprise throttling oil duct 4, and this throttling oil duct 4 is communicated with rod chamber 5 and oil inlet and outlet 10, and this throttling oil duct 4 can reduce the pressure in rod chamber 5.By arranging this throttling oil duct 4, when pressure in rod chamber 5 cannot be opened lower than the first compensator or trimmer pressure setting value, the first pressure controlled valve 2 and/or the second pressure controlled valve 3, hydraulic oil in rod chamber 5 can flow to oil inlet and outlet 10 by this throttling oil duct 4, thus realizes the suppression to compensator or trimmer pressure under this operating mode by throttling oil duct 4.
As the embodiment of throttling oil duct 4, it can be throttle orifice or throttling groove, the throttling groove being such as arranged on the throttle orifice on guide sleeve 1 or being arranged on piston rod 9, but is understood that, the mode of execution of throttling oil duct 4 is not limited thereto.
First pressure controlled valve 2 of the present utility model and the second pressure controlled valve 3 can be relief valve.
As depicted in figs. 1 and 2, in an embodiment of the present utility model, compensator or trimmer pressure control mechanism comprises the first pressure controlled valve 2, second pressure controlled valve 3 and throttling oil duct 4, wherein the first pressure controlled valve 2 and the second pressure controlled valve 3 form pilot-type relief valve, first pressure controlled valve 2 is used as pilot valve, second pressure controlled valve 3 is used as main valve, and throttling oil duct 4 is for being arranged on the throttle orifice on guide sleeve 1, and throttling oil duct 4 is arranged along the axis of guide sleeve 1, the benefit that throttling oil duct 4 is arranged like this is, difficulty of processing is less, cost is lower, be not only applicable to the oil hydraulic cylinder of little tonnage, also be applicable to large-tonnage oil hydraulic cylinder simultaneously.
Based on this embodiment, in buffering course, when compensator or trimmer pressure meets design requirement lower than the first compensator or trimmer pressure setting value, compensator or trimmer pressure, pilot-type relief valve is not opened, hydraulic oil in rod chamber 5 can flow to oil inlet and outlet 10 by throttling oil duct 4, plays the effect reducing compensator or trimmer pressure in rod chamber 5; When the pressure in rod chamber 5 instantaneous higher than the first compensator or trimmer pressure setting value time, the first pressure controlled valve 2 as pilot valve is opened, hydraulic oil in rod chamber 5 can flow to oil inlet and outlet 10 through throttling oil duct 4 and the first pressure controlled valve 2, reduces instantaneous high pressure, suppresses compensator or trimmer pressure peak value; And when the compensator or trimmer pressure in rod chamber 5 continues higher than the first compensator or trimmer pressure setting value; the first pressure controlled valve 2 as pilot valve and the second pressure controlled valve 3 as main valve are all opened; hydraulic oil in rod chamber 5 can flow to oil inlet and outlet 10 through throttling oil duct 4, first pressure controlled valve 2 and the second pressure controlled valve 3, realizes the object suppressing continuous high-pressure, protection oil hydraulic cylinder.
In the various embodiments described above, host buffer portion and compensator or trimmer pressure control mechanism are all be arranged in the rod chamber 5 of single-piston-rod hydraulic cylinder, the movement velocity of piston 8 can be slowed down like this when piston rod 9 stretches out, suppress compensator or trimmer pressure peak value, and in fact, host buffer portion of the present utility model and compensator or trimmer pressure control mechanism also can be arranged in the rodless cavity 11 of single-piston-rod hydraulic cylinder, the movement velocity of piston 8 can be slowed down like this when piston rod 9 is retracted, suppress compensator or trimmer pressure peak value, in addition, can also be arranged in rod chamber 5 and rodless cavity 11 simultaneously, to stretch out and in two moving direction of retracting at piston rod 9 like this, the movement velocity of piston 8 can be slowed down, suppress compensator or trimmer pressure peak value, and for hydraulic cylinder with double piston rods, the utility model is also applicable, host buffer portion and compensator or trimmer pressure control mechanism can be arranged in two rod chambers 5 simultaneously, or also can be arranged on wherein in any one rod chamber 5.
Fig. 4 shows the structural drawing of the utility model second embodiment.Fig. 5 shows the II partial enlarged drawing of Fig. 4.In this embodiment, compensator or trimmer pressure control mechanism is arranged in rodless cavity 11.As shown in Figure 4 and Figure 5, compensator or trimmer pressure control mechanism is arranged on cylinder bottom 12, and cylinder bottom 12 is positioned at rodless cavity 11 one end, and wherein the first pressure controlled valve 2 and/or the second pressure controlled valve 3 are removably disposed on cylinder bottom 12.
Based on this second embodiment, the movement velocity of piston 8 can slow down in host buffer portion when piston rod 9 is retracted, avoid it to impact cylinder bottom 12, damages oil hydraulic cylinder; And compensator or trimmer pressure control mechanism can suppress the compensator or trimmer pressure peak value in rodless cavity 11 in this buffering course, its working principle is similar to suppressing the working principle of compensator or trimmer pressure peak value in rod chamber 5 in foregoing embodiments, repeats no more herein.
As shown in Figure 4, in this second embodiment, host buffer portion remains and utilizes throttle chink to realize buffering object, wherein, throttle chink is center hole on cylinder bottom 12 and the matching gap between buffer plunger 13, and this is a kind of common structure form that rodless cavity 11 cushions, and is no longer described in detail herein, certainly, the utility model can also adopt the host buffer portion of other structural types to realize the buffering of rodless cavity 11.
In addition, it should be noted that, in each embodiment of the present utility model, between first spool 206 of the first pressure controlled valve 2 and the first valve body 204, between the second spool 306 of the second pressure controlled valve 3 and the second valve body 304, the sealing configuration such as face seal or linear sealing can be set, reveal impact on the performance of oil hydraulic cylinder to avoid hydraulic oil.
Oil hydraulic cylinder provided by the utility model, is applicable to the various engineering machinery such as hoist and excavator, is particularly useful for large-tonnage engineering machinery.Because oil hydraulic cylinder of the present utility model has above-mentioned beneficial effect, therefore, the engineering machinery comprising this oil hydraulic cylinder also has corresponding technique effect.
The foregoing is only exemplary embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (15)
1. an oil hydraulic cylinder, comprise oil pocket, the oil inlet and outlet (10) be communicated with described oil pocket and host buffer portion, described host buffer portion is used for the movement velocity slowing down described piston (8) when the piston (8) of described oil hydraulic cylinder moves to setting buffer area, it is characterized in that, described oil hydraulic cylinder also comprises compensator or trimmer pressure control mechanism, described compensator or trimmer pressure control mechanism comprises the first pressure controlled valve (2), first pressure controlled valve (2) described in when pressure in described oil pocket is more than or equal to the first compensator or trimmer pressure setting value opens to be communicated with described oil pocket and described oil inlet and outlet (10) by described first pressure controlled valve (2).
2. oil hydraulic cylinder according to claim 1, it is characterized in that, first oil outlet (T1) of described first pressure controlled valve (2) is communicated with described oil inlet and outlet (10), first filler opening (P1) of described first pressure controlled valve (2) is communicated with described oil pocket, whether first spool (206) of described first pressure controlled valve (2) is communicated with described first oil outlet (T1) for controlling described first filler opening (P1), and described first oil outlet (T1) is multiple first oil through.
3. oil hydraulic cylinder according to claim 1, it is characterized in that, first pressure controlled valve (2) interior separation is the first valve pocket (203) and the second valve pocket (207) by first spool (206) of described first pressure controlled valve (2), described first valve pocket (203) is communicated with described oil inlet and outlet (10) by first oil outlet (T1) of described first pressure controlled valve (2), whether described first spool (206) is communicated with first filler opening (P1) of described first pressure controlled valve (2) for controlling described second valve pocket (207), described first filler opening (P1) is communicated with described oil pocket, described first valve pocket (203) is communicated with by through-flow oil duct (205) with described second valve pocket (207).
4. oil hydraulic cylinder according to claim 3, it is characterized in that, described first pressure controlled valve (2) comprises the first valve body (204), first spool (206) of described first pressure controlled valve (2) is arranged in described first valve body (204), and described through-flow oil duct (205) is arranged on described first spool (206) and/or described first valve body (204).
5. oil hydraulic cylinder according to any one of claim 1 to 4, is characterized in that, described compensator or trimmer pressure control mechanism also comprises the second pressure controlled valve (3), and described second pressure controlled valve (3) is set to:
When pressure after described first pressure controlled valve (2) is opened in described oil pocket still continues to be more than or equal to described first compensator or trimmer pressure setting value, described second pressure controlled valve (3) opens to be communicated with described oil pocket and described oil inlet and outlet (10) by described second pressure controlled valve (3); Or,
When pressure in described oil pocket is more than or equal to the second compensator or trimmer pressure setting value, described second pressure controlled valve (3) opens to be communicated with described oil pocket and described oil inlet and outlet (10) by described second pressure controlled valve (3), and described second compensator or trimmer pressure setting value is greater than described first compensator or trimmer pressure setting value.
6. oil hydraulic cylinder according to claim 5, it is characterized in that, described second pressure controlled valve (3) and described first pressure controlled valve (2) are combined to form type pilot pressure controlled valve, described first pressure controlled valve (2) is as the pilot valve of described second pressure controlled valve (3), when pressure after described first pressure controlled valve (2) is opened in described oil pocket still continues to be more than or equal to described first compensator or trimmer pressure setting value, described second pressure controlled valve (3) is opened.
7. oil hydraulic cylinder according to claim 6, it is characterized in that, described second pressure controlled valve (3) interior separation is the 3rd valve pocket (303) and the 4th valve pocket (307) by second spool (306) of described second pressure controlled valve (3), described 4th valve pocket (307) is communicated with described oil inlet and outlet (10) by second oil outlet (T2) of described second pressure controlled valve (3), whether described second spool (306) is communicated with second filler opening (P2) of described second pressure controlled valve (3) for controlling described 4th valve pocket (307), described second filler opening (P2) is communicated with described oil pocket, described 3rd valve pocket (303) is communicated with first filler opening (P1) of described first pressure controlled valve (2), described first filler opening (P1) is communicated with described oil pocket by the first damping unit (101).
8. oil hydraulic cylinder according to claim 7, is characterized in that, described first damping unit (101) is throttle orifice or throttling groove.
9. oil hydraulic cylinder according to claim 7, is characterized in that, described second oil outlet (T2) is multiple second oil through.
10. oil hydraulic cylinder according to claim 5, is characterized in that, described first pressure controlled valve (2) is relief valve, and/or described second pressure controlled valve (3) is relief valve.
11. oil hydraulic cylinders according to claim 1, is characterized in that, described oil pocket is rod chamber (5) and/or rodless cavity (11).
12. oil hydraulic cylinders according to claim 1, is characterized in that,
Described oil pocket is rod chamber (5), described host buffer portion comprises the guide sleeve (1) coordinated with the piston rod of described oil hydraulic cylinder (9), and described compensator or trimmer pressure control mechanism is removably disposed on described guide sleeve (1); And/or
Described oil pocket is rodless cavity (11), and described compensator or trimmer pressure control mechanism is removably disposed on the cylinder bottom (12) of described oil hydraulic cylinder.
13. oil hydraulic cylinders according to claim 1, is characterized in that, described oil hydraulic cylinder also comprises throttling oil duct (4), and described throttling oil duct (4) is communicated with described oil pocket and described oil inlet and outlet (10).
14. oil hydraulic cylinders according to claim 13, is characterized in that, described throttling oil duct (4) is throttle orifice or throttling groove.
15. 1 kinds of engineering machinery, is characterized in that, comprise the oil hydraulic cylinder according to any one of claim 1 to 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520508550.4U CN205001279U (en) | 2015-07-14 | 2015-07-14 | Pneumatic cylinder and have engineering machinery of this pneumatic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520508550.4U CN205001279U (en) | 2015-07-14 | 2015-07-14 | Pneumatic cylinder and have engineering machinery of this pneumatic cylinder |
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| Publication Number | Publication Date |
|---|---|
| CN205001279U true CN205001279U (en) | 2016-01-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520508550.4U Expired - Fee Related CN205001279U (en) | 2015-07-14 | 2015-07-14 | Pneumatic cylinder and have engineering machinery of this pneumatic cylinder |
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| Country | Link |
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| CN (1) | CN205001279U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106704288A (en) * | 2015-07-14 | 2017-05-24 | 徐工集团工程机械股份有限公司 | Hydraulic cylinder buffering structure and engineering machine with hydraulic cylinder buffering structure |
-
2015
- 2015-07-14 CN CN201520508550.4U patent/CN205001279U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106704288A (en) * | 2015-07-14 | 2017-05-24 | 徐工集团工程机械股份有限公司 | Hydraulic cylinder buffering structure and engineering machine with hydraulic cylinder buffering structure |
| CN106704288B (en) * | 2015-07-14 | 2018-09-04 | 徐工集团工程机械股份有限公司 | Hydraulic cylinder and engineering machinery with the hydraulic cylinder |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160127 Termination date: 20200714 |