CN204805216U

CN204805216U - Direction buffer , hydraulic cylinder and excavator

Info

Publication number: CN204805216U
Application number: CN201520329896.8U
Authority: CN
Inventors: 刘美英; 杨涛; 孙辉
Original assignee: Construction Machinery Branch of XCMG
Current assignee: Construction Machinery Branch of XCMG
Priority date: 2015-05-20
Filing date: 2015-05-20
Publication date: 2015-11-25
Anticipated expiration: 2025-05-20

Abstract

The utility model relates to a direction buffer, hydraulic cylinder and excavator, wherein, it includes cylinder, uide bushing, piston and piston rod direction buffer, and the uide bushing setting is on the cylinder, and the piston setting is in the cylinder, and the piston is connected to the one end of piston rod, and the uide bushing is worn out to the other end of piston rod, and the chamber at cylinder inner piston pole place is provided with the hydro -cylinder export for there being the pole chamber on the uide bushing, and the hydro -cylinder export is used for the intercommunication to have a pole chamber, its characterized in that: be provided with at least one buffer module on the uide bushing, the buffer module includes the casing, is provided with buffer beam and springiness cushioning spare in the casing, at the in -process that the piston rod stretches out to the uide bushing orientation, the buffer beam pushes springiness cushioning spare at the piston with having under the effect of pole chamber oil pressure, the speed of stretching out that the elastic force through springiness cushioning spare and the oil pressure that has the pole chamber slow down the piston rod. The utility model discloses can further cushion piston rod terminus speed, reduce and hit the jar risk.

Description

Guiding damping device, hydraulic jack and excavator

Technical field

The utility model relates to engineering machinery field, particularly relates to a kind of guiding damping device, hydraulic jack and excavator.

Background technique

Because inertia can cause extreme shock to end cap and may cause the damage of oil cylinder when excavator oil cylinder reaches limit position, therefore need to arrange corresponding buffer structure at oil cylinder ante-chamber, this buffer structure has throttling action to the fluid flowing between rod chamber to oil cylinder outlet, pressure in rod chamber is raised, slow down tip speed when piston rod stretches out, avoid causing damage to oil cylinder.

As shown in Figure 1, be a kind of ante-chamber buffer structure of the prior art, it cushion collar 3 ' comprising guide sleeve 1 ', cylinder barrel 2 ', piston rod 5 ', piston 4 ' and be sleeved on piston rod 5 '.Guide sleeve 1 ' is arranged on cylinder barrel 2 ', piston 4 ' is arranged in cylinder barrel 2 ', and one end of piston rod 5 ' connects piston 4 ', and the other end of piston rod 5 ' passes guide sleeve 1 ', the chamber at cylinder barrel 2 ' inner piston rod 5 ' place is rod chamber 7 ', guide sleeve 1 ' is provided with oil cylinder outlet 6 '.There is very wide arc gap between guide sleeve 1 ' and piston rod 5 ', the pressure oil in rod chamber 7 ' enters oil cylinder outlet 6 ' by this gap, and this oil circuit is the working connection of rod chamber 7 ' to oil cylinder outlet 6 '.When piston rod 5 ' stretches out, cushion collar 3 ' inserts in guide sleeve 1 ', closed by the working connection of rod chamber 7 ' to oil cylinder outlet 6 ', guide sleeve 1 ' forms throttling oil circuit with the matching gap of cushion collar 3 ', and the fluid in rod chamber 7 ' flows to oil cylinder outlet 6 ' by throttling oil circuit.Under the damping function of throttling oil circuit, the speed of stretching out of piston rod 5 ' reduces, pressure simultaneously in rod chamber 7 ' raises, piston 4 ' is the closer to guide sleeve 1 ', rod chamber 7 ' is longer to oil cylinder outlet 6 ' throttling oil circuit, the damping function of throttling oil circuit is more obvious, and the speed of stretching out of piston rod 4 ' is less, until stretch out completely.

Above-mentioned ante-chamber buffer structure, matching gap is formed between cushion collar and guide sleeve, between rod chamber and oil cylinder outlet, less flow area is formed by matching gap, fluid in rod chamber flows to oil cylinder outlet by matching gap, by the throttling action of matching gap, cavity pressure before improving, realizes piston rod retarded motion, realizes cushioning effect.This structure is widely used, but also there are some defects, as follows:

1) this ante-chamber buffer structure, by buffer gap to the throttling of rod chamber fluid, reduces piston movement speed, but cannot guarantee buffering end speed, exist and hit cylinder risk.

2) if the matching gap value of guide sleeve and cushion collar choose reasonable not, piston and guide sleeve is very easily caused to occur to clash into or overpressure in rod chamber, and current ante-chamber buffer structure is to suppress surge pressure in buffering course, effectively cannot control the pressure in buffering end rod chamber, buffering end overpressure will cause oil cylinder stroke tip speed fluctuation in excavator using process, directly affect overall efficiency and operation comfort.

Also have in prior art on the basis of above-mentioned ante-chamber buffer structure, runner is offered at piston rod or guide sleeve position, such as on guide sleeve, offer throttle orifice, or be provided with the throttling groove that multiple flow area changes with buffering on the piston rod, these two kinds of modes can form liquid flow channel for oil between rod chamber and oil cylinder outlet, thus realize reducing the pressure maximum in buffering course rod chamber.But offer throttle orifice on guide sleeve or cylinder piston rod, though can improve cushioning effect, reduce buffering surge pressure, cannot guarantee to meet buffer requirements, and piston rod offers throttle orifice difficulty of processing greatly, cost is high.Further, buffering end speed, buffering end pressure, buffering surge pressure, three design objectives are interrelated, reach designing requirement comparatively large by current structure optimizing difficulty simultaneously, cannot obtain optimized buffer effect.

Model utility content

The purpose of this utility model proposes a kind of guiding damping device, hydraulic jack and excavator, and it can damper piston bar tip speed further, and cylinder risk is hit in reduction.

For achieving the above object, the utility model provides a kind of guiding damping device, it comprises cylinder barrel, guide sleeve, piston and piston rod, described guide sleeve is arranged on described cylinder barrel, described piston is arranged in described cylinder barrel, one end of described piston rod connects described piston, the other end of described piston rod passes described guide sleeve, in described cylinder barrel, the chamber at described piston rod place is rod chamber, described guide sleeve is provided with oil cylinder outlet, described guide sleeve is provided with at least one buffer module, described buffer module comprises housing, buffer bar and resilient snubber is provided with in described housing, in the process that described piston rod stretches out to described guide sleeve direction, described buffer bar extrudes described resilient snubber under the effect of described piston and described rod chamber oil pressure, and that slows down described piston rod by the elastic force of described resilient snubber and the oil pressure of described rod chamber stretches out speed.

One preferably or in embodiment, all corresponding throttle orifice be arranged on described guide sleeve of each described buffer module, described throttle orifice is communicated with described buffer module corresponding to it and the outlet of described oil cylinder.

One preferably or in embodiment, described buffer module comprises buffering end slowdown module, described housing comprises the first housing, described buffer bar comprises buffer deceleration bar, described resilient snubber comprises the first elastic component, described throttle orifice comprises first segment discharge orifice, described buffering end slowdown module also comprises one-way valve, the first through hole is provided with in described first housing, described one-way valve and described first elastic component are all arranged in described first through hole, one end of described buffer deceleration bar is positioned at described first through hole, the other end of described buffer deceleration bar is positioned at described rod chamber, described buffer deceleration bar can to-and-fro motion compress or discharge described first elastic component in described first through hole, described buffer deceleration bar the position of described first through hole can and the inwall of described first through hole between form sealed cavity, described buffer deceleration bar is provided with the oil circuit for being communicated with described sealed cavity and described one-way valve oil outlet, the filler opening of described one-way valve is communicated with described first through hole, described first through hole is also communicated with described first segment discharge orifice.

Preferably or in embodiment, described one-way valve is also provided with one-way valve throttle orifice one, described one-way valve throttle orifice is communicated with spring chamber in described one-way valve and described first through hole.

One preferably or in embodiment, described first through hole comprises the first through hole and the first small through hole that aperture reduces successively, described buffer deceleration bar comprises the first deceleration bar section that bar footpath reduces successively, second deceleration bar section and the 3rd deceleration bar section, described first deceleration bar section, described second deceleration bar section and described first elastic component are all positioned at described first through hole, described buffer deceleration bar is in described first through hole under reciprocating state, one end of described 3rd deceleration bar section is positioned at described first through hole or is positioned at described first small through hole, the other end of described 3rd deceleration bar section passes described first small through hole and is positioned at described rod chamber, the bar footpath of described first deceleration bar section is suitable with the aperture of described first through hole, the bar footpath of described second deceleration bar section is less than the aperture of described first through hole, be greater than the aperture of described first small through hole, the bar footpath of described 3rd deceleration bar section is suitable with the aperture of described first small through hole, described buffer deceleration bar is in described first through hole under reciprocating state, described second deceleration bar section can and described first through hole between form described sealed cavity, or form described sealed cavity between described second deceleration bar section and the common and described first through hole of the described 3rd deceleration bar section of part.

One preferably or in embodiment, the first axial bore is provided with in described first deceleration bar section, the oil outlet of described one-way valve is arranged in described first axial bore, second deceleration bar section is provided with at least one the 5th radial hole, described 5th radial hole is communicated with the oil outlet of described one-way valve and described sealed cavity.

One preferably or in embodiment, described buffer module comprises buffering end pressure-reduction module, described housing comprises the second housing, described buffer bar comprises hollow stem, described resilient snubber comprises the second elastic component, described throttle orifice comprises second section discharge orifice, the 3rd axial bore is provided with in described second housing, described second elastic component is arranged in described 3rd axial bore, one end of described hollow stem is positioned at described 3rd axial bore, the other end of described hollow stem is positioned at described rod chamber, described hollow stem can to-and-fro motion compress or discharge described second elastic component in described 3rd axial bore, annular chamber is formed between described second housing and described guide sleeve, described annular chamber fluid is communicated with described second section discharge orifice, described hollow stem is provided with the hollow stem oil circuit for being communicated with described rod chamber and described 3rd axial bore, described second housing is provided with the 3rd radial hole for being communicated with described hollow stem oil circuit and described annular chamber, under the state of described second elastic component of described hollow stem compression, described rod chamber fluid is communicated with described hollow stem oil circuit, described 3rd radial hole and described annular chamber.

One preferably or in embodiment, described hollow stem oil circuit comprises the second through hole be arranged in described hollow stem, also comprise the first radial hole being arranged on described hollow stem one end, with the second radial hole being arranged on the described hollow stem the other end, described first radial hole is communicated with described rod chamber and described second through hole, described second radial hole is communicated with described second through hole, and under the state of described second elastic component of described hollow stem compression, described second radial hole can also be communicated with described 3rd radial hole.

One preferably or in embodiment, the second axial bore is also provided with in described second housing, described annular chamber is communicated with described second section discharge orifice by described second axial bore fluid, the 3rd elastic component and throttling rod is provided with in described second axial bore, described throttling rod can to-and-fro motion compress or discharge described 3rd elastic component in described second axial bore, when oil pressure in described annular chamber reaches setting value, described 3rd elastic component of described throttling rod compression, described annular chamber, described second axial bore and described second section flow communication, when oil pressure in described annular chamber is less than setting value, described throttling rod is under the effect of described 3rd elastic component, oil circuit between described annular chamber and described second axial bore is closed.

One preferably or in embodiment, described second axial bore comprises the second largest axial bore and the second little axial bore that aperture reduces successively, described throttling rod and described 3rd elastic component are arranged in described second largest axial bore, the bar footpath of described throttling rod is suitable with the aperture of described second largest axial bore, the bar footpath of described throttling rod is greater than the aperture of described second little axial bore, the circumference of described second largest axial bore is provided with at least one the first axial notches, the first flow channels is formed between described throttling rod and described first axial notch, described first flow channels is communicated with described second section discharge orifice, during described 3rd elastic component of described throttling rod compression, described annular chamber, described second little axial bore is communicated with described first flow channels fluid, when described 3rd elastic component of described throttling rod release is to described second little axial bore direction motion, bar footpath due to described throttling rod is greater than the aperture of described second little axial bore, described second little axial bore can be closed with being communicated with between described first flow channels by described throttling rod.

One preferably or in embodiment, be also provided with block in described annular chamber, described annular chamber is divided into the first annular chamber and the second annular chamber by described block, described block is provided with the block through hole being communicated with described first annular chamber and described second annular chamber.

One preferably or in embodiment, described buffer module comprises buffering surge pressure adjustment module, described housing comprises the 3rd housing, described buffer bar comprises pressure adjusting lever, described resilient snubber comprises the 4th elastic component, described throttle orifice comprises the 3rd throttle orifice, third through-hole is provided with in described 3rd housing, described 4th elastic component and described pressure adjusting lever are arranged in described third through-hole, described third through-hole is communicated with described 3rd throttle orifice, described pressure adjusting lever can to-and-fro motion compress or discharge described 4th elastic component in described third through-hole, under the state of described 4th elastic component of described pressure adjusting lever compression, described rod chamber, described third through-hole is communicated with described 3rd throttle orifice fluid, described 4th elastic component of described pressure adjusting lever release, under the effect of described 4th elastic component, described rod chamber is closed to the oil circuit in described third through-hole by described pressure adjusting lever.

One preferably or in embodiment, described third through-hole comprises the third-largest through hole and the 3rd small through hole that aperture reduces successively, described 4th elastic component and described pressure adjusting lever are all arranged in described the third-largest through hole, described the third-largest through hole is communicated with described 3rd throttle orifice, described 3rd small through hole is communicated with described rod chamber, the bar footpath of described pressure adjusting lever is suitable with the aperture of described the third-largest through hole, the bar footpath of described pressure adjusting lever is greater than the aperture of described 3rd small through hole, the circumference of described the third-largest through hole is provided with at least one the second axial notches, the second flow channels is formed between described pressure adjusting lever and described second axial notch, during described 4th elastic component of described pressure adjusting lever compression, described rod chamber, described 3rd small through hole, described second flow channels is communicated with described 3rd throttle orifice, described 4th elastic component of described pressure adjusting lever release is to described 3rd small through hole direction motion, oil circuit between described 3rd small through hole and described second flow channels can be closed by described pressure adjusting lever.

For achieving the above object, the utility model additionally provides a kind of hydraulic jack, and it comprises the guiding damping device in above-mentioned any embodiment.

For achieving the above object, the utility model additionally provides a kind of excavator, and it comprises the hydraulic jack in above-mentioned any embodiment.

Based on technique scheme, the utility model at least has following beneficial effect:

The utility model is provided with at least one buffer module on guide sleeve, buffer module comprises buffer bar and resilient snubber, in the process that piston rod stretches out to guide sleeve direction, buffer bar extrudes resilient snubber under the effect of the oil pressure of piston and rod chamber, the end being slowed down piston rod by the elastic force of resilient snubber and the oil pressure of rod chamber further stretches out speed, reduce and hit cylinder risk, and, be provided with the guide sleeve of buffer module, the requirement to matching gap value between cushion collar and guide sleeve can be reduced further, reduce the machining accuracy of cushion collar and guide sleeve further simultaneously, improve the reliability of oil cylinder.

Accompanying drawing explanation

Accompanying drawing described herein is used to provide further understanding of the present utility model, and form a application's part, schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:

Fig. 1 is the schematic diagram of a kind of ante-chamber buffer structure in prior art;

First cross-sectional schematic of the guiding damping device that Fig. 2 provides for the utility model;

Second cross-sectional schematic of the guiding damping device that Fig. 3 provides for the utility model;

Fig. 4 is arranged on the cross-sectional schematic on guide sleeve for buffering end slowdown module that the utility model provides;

The cross-sectional schematic of the buffering end slowdown module that Fig. 5 provides for the utility model;

Fig. 6 is for looking schematic diagram in a left side for the buffering end slowdown module that the utility model provides;

Fig. 7 is for looking schematic diagram in the right side of the buffering end slowdown module that the utility model provides;

Fig. 8 is arranged on the cross-sectional schematic on guide sleeve for buffering end pressure-reduction module that the utility model provides;

The cross-sectional schematic of the buffering end pressure-reduction module that Fig. 9 provides for the utility model;

Figure 10 is for looking schematic diagram in a left side for the buffering end pressure-reduction module that the utility model provides;

Figure 11 is for looking schematic diagram in the right side of the buffering end pressure-reduction module that the utility model provides;

Figure 12 is arranged on the cross-sectional schematic on guide sleeve for buffering surge pressure adjustment module that the utility model provides;

The cross-sectional schematic of the buffering surge pressure adjustment module that Figure 13 provides for the utility model;

Figure 14 is the A-A schematic cross-section of Figure 13;

Figure 15 is for looking schematic diagram in the right side of the buffering surge pressure adjustment module that the utility model provides.

Attached number in the figure:

1 '-guide sleeve; 2 '-cylinder barrel; 3 '-cushion collar; 4 '-piston; 5 '-piston rod; 6 '-oil cylinder exports; 7 '-rod chamber;

1-guide sleeve; 2-cylinder barrel; 3-cushion collar; 4-piston; 5-piston rod; 6-oil cylinder exports; 7-rod chamber; 8-rodless cavity;

10-buffering end slowdown module; 101-first housing; 102-buffer deceleration bar; 103-first elastic component; 104-first segment discharge orifice; 105-one-way valve; 106-sealed cavity; 107-the 5th radial hole; 108-one-way valve throttle orifice;

20-buffering end pressure-reduction module; 201-second housing; 202-hollow stem; 203-second elastic component; 204-second section discharge orifice; 205-end cap; 206-annular chamber; 207-first radial hole; 208-second radial hole; 209-the 3rd radial hole; 210-the 3rd elastic component; 211-throttling rod; 212-first flow channels; 213-pressure regulating cavity; 214-the 4th radial hole; 215-block through hole 215;

30-cushions surge pressure adjustment module; 301-the 3rd housing; 302-pressure adjusting lever; 303-the 4th elastic component; 304-the 3rd throttle orifice; 305-second flow channels; 306-third through-hole.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technological scheme in embodiment is clearly and completely described.Obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiments.Based on embodiment of the present 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.

In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore the restriction to the utility model protection domain can not be interpreted as.

Current hydraulic jack, when piston rod reaches limit position, because inertia can cause extreme shock to cylinder cover and may cause the damage of oil cylinder, therefore, need to arrange corresponding buffer structure at the rod chamber 7 of hydraulic jack, reduce the speed that piston rod stretches out end of travel.

As shown in Figure 2 and Figure 3, be the illustrative examples of the guiding damping device that the utility model provides, in this illustrative examples, guiding damping device comprises guide sleeve 1, cylinder barrel 2, cushion collar 3, piston 4 and piston rod 5.One end of cylinder barrel 2 is closed, the other end is provided with guide sleeve 1, piston 4 is arranged in cylinder barrel 2, one end of piston rod 5 is positioned at cylinder barrel 2 and connects piston 4, the other end of piston rod 5 passes guide sleeve 1, cushion collar 3 is arranged on piston rod 5, and the chamber at cylinder barrel 2 inner piston rod 5 place is rod chamber 7, and another chamber in cylinder barrel 2 is rodless cavity 8.There is very wide arc gap between guide sleeve 1 and piston rod 5, the pressure oil in rod chamber 7 enters oil cylinder outlet 6 by this gap, and this oil circuit is the working connection of rod chamber 7 to oil cylinder outlet 6.When piston rod 5 moves to guide sleeve 1 direction, cushion collar 3 can insert in guide sleeve 1, the working connection of rod chamber 7 to oil cylinder outlet 6 is closed, matching gap between guide sleeve 1 and cushion collar 3 forms throttling oil circuit, fluid in rod chamber 7 flows to oil cylinder outlet 6 by throttling oil circuit, under the damping function of throttling oil circuit, piston rod 5 stretches out speed to be reduced, pressure simultaneously in rod chamber 7 raises, piston 4 is the closer to guide sleeve 1, it is longer that rod chamber 7 exports 6 throttling oil circuits to oil cylinder, the damping function of throttling oil circuit is more obvious, the speed of stretching out of piston rod 5 is less, until stretch out completely.

Be Spielpassung between the guide sleeve 1 of above-mentioned buffer structure and cushion collar 3, after entering buffer area, fluid flows to oil cylinder by matching gap by rod chamber 7 and exports 6, and in rod chamber 7, pressure raises, and piston rod 5 speed of stretching out starts to reduce.On the basis of above-mentioned buffer structure, in the guiding damping device that the utility model provides, guide sleeve 1 is also provided with at least one buffer module, and buffer module comprises housing, is provided with buffer bar and resilient snubber in housing; In the process that piston rod 5 stretches out to guide sleeve 1 direction, buffer bar extrudes resilient snubber under the effect of the oil pressure of piston 4 and rod chamber 7, the end being slowed down piston rod 5 by the elastic force of resilient snubber and the oil pressure of rod chamber 7 further stretches out speed, reduce and hit cylinder risk, and, be provided with the guide sleeve 1 of buffer module, the requirement to matching gap value between cushion collar 3 and guide sleeve 1 can be reduced further, reduce the machining accuracy of cushion collar 3 and guide sleeve 1 simultaneously further, improve the reliability of oil cylinder.

In illustrative examples in above-mentioned guiding damping device, each buffer module all can a corresponding throttle orifice be arranged on guide sleeve 1, and throttle orifice is communicated with buffer module corresponding to it and oil cylinder outlet 6.By arranging throttle orifice, the hydraulic oil suck-back that oil cylinder can be exported 6 enters buffer module, the end reducing piston rod 5 stretches out speed, or the hydraulic oil in rod chamber 7 can be made to enter oil cylinder outlet 6 by buffer module, throttle orifice, reduce the pressure of rod chamber 7 end of travel, and then reduce the speed fluctuation of piston rod 5 end of travel, improve overall efficiency and operation comfort.

As shown in figs. 4-7, in order to provide resistance by mechanical mechanism to piston 4 at buffering end, reduce piston 4 movement velocity of buffering end, reducing speed avoids reverse impact while impacting, the buffer module that the utility model provides comprises buffering end slowdown module 10, housing in buffering end slowdown module 10 is the first housing 101, buffer bar is buffer deceleration bar 102, resilient snubber is the first elastic component 103, throttle orifice is first segment discharge orifice 104, and buffering end slowdown module 10 also comprises one-way valve 105.

Guide sleeve 1 offers the first tapped hole, the first housing 101 is provided with outside thread, the first housing 101 is threaded connection and is arranged in the first tapped hole, and then is fixed on guide sleeve 1 by whole buffering end slowdown module 10.

The first through hole is provided with in first housing 101, one-way valve 105 and the first elastic component 103 are all arranged in the first through hole, one end of buffer deceleration bar 102 is positioned at the first through hole, the other end of buffer deceleration bar 102 is positioned at rod chamber 7, buffer deceleration bar 102 can compress or release the first elastic component 103 in the first through hole in to-and-fro motion, buffer deceleration bar 102 can form sealed cavity 106 between the position of the first through hole and the inwall of the first through hole, buffer deceleration bar 102 is provided with the oil circuit for being communicated with sealed cavity 106 and one-way valve 105 oil outlet, the filler opening of one-way valve 105 is communicated with the first through hole, first through hole is also communicated with first segment discharge orifice 104.

When piston rod 5 moves to guide sleeve 1 direction, when piston 5 and buffer deceleration bar 102 touch, buffer deceleration bar 102 starts to compress the first elastic component 103, the volume of sealed cavity 102 increases gradually, pressure reduces gradually, the pressure oil of oil cylinder outlet 6 enters sealed cavity 106 by the oil circuit on first segment discharge orifice 104, first through hole, the filler opening of one-way valve 105, the oil outlet of one-way valve 105 and buffer deceleration bar 102, by the active force of the first elastic component 103, and damper piston 5 movement velocity.

Alternatively, the first through hole comprises first through hole and the first small through hole, and the aperture of first through hole is greater than the aperture of the first small through hole, and the joint of first through hole and the first small through hole forms shoulder, the first small through hole relative to first through hole near rod chamber 7.

Buffer deceleration bar 102 comprises the first deceleration bar section, the second deceleration bar section and the 3rd deceleration bar section, and the bar footpath of the first deceleration bar section is greater than the bar footpath of the second deceleration bar section, and the bar footpath of the second deceleration bar section is greater than the bar footpath of the 3rd deceleration bar section,

First deceleration bar section, the second deceleration bar section and the first elastic component 103 are all positioned at first through hole, and the to-and-fro motion in first through hole of deceleration buffer bar can extrude the first elastic component 103 or discharge.

Buffer deceleration bar 102 is in the first through hole under reciprocating state, and one end of the 3rd deceleration bar section is positioned at first through hole or is positioned at the first small through hole, and the other end of the 3rd deceleration bar section passes the first small through hole and is positioned at rod chamber 7; The bar footpath of the first deceleration bar section and the aperture of first through hole are quite (equal or almost equal), the bar footpath of the second deceleration bar section is less than the aperture of first through hole, be greater than the aperture of the first small through hole, the bar footpath of the 3rd deceleration bar section and the aperture of the first small through hole are quite (equal or almost equal), buffer deceleration bar 102 is in the first through hole under reciprocating state, second deceleration bar section can and first through hole between form sealed cavity 106, or the second deceleration bar section and part the 3rd deceleration bar section is common and form sealed cavity 106 between first through hole.

Bar footpath due to the second deceleration bar section is greater than the aperture of the first small through hole, and the second deceleration bar section and the shoulder formed between first through hole and the first small through hole cooperatively interact, the slippage from the first through hole of restriction deceleration buffer bar.

The first axial bore is provided with in first deceleration bar section, the oil outlet of one-way valve 105 is arranged in the first axial bore, second deceleration bar section is provided with the oil outlet that at least one the 5th radial hole the 107, five radial hole 107 is communicated with the first axial bore internal check valve 105, is also communicated with sealed cavity 106.Due to the bar footpath of the first deceleration bar section and the aperture suitable (equal or almost equal) of first through hole, at least one seal ring is provided with between the first deceleration bar section and first through hole, the aperture of the 3rd deceleration bar section and the first small through hole quite (equal or almost equal), at least one seal ring is provided with between the 3rd deceleration bar section and the first small through hole, therefore, it is possible to make the better tightness of sealed cavity 106.

The part-structure of one-way valve 105 is arranged in the first axial bore, and other structures of one-way valve 105 are positioned at first through hole, and the end that one-way valve 105 is positioned at first through hole is filler opening, and the end being positioned at the first axial bore is oil outlet.

Alternatively, the position that one-way valve 105 is positioned at first through hole is also provided with one-way valve throttle orifice 108, and one-way valve throttle orifice 108 is communicated with the spring chamber of one-way valve 105 and first through hole.One-way valve 105 promotes buffer deceleration bar 102 at piston 4 and compresses unlatching when the first elastic component 103 moves, and when piston rod 5 is retracted, one-way valve 105 is closed.When one-way valve 105 is closed, only have the spring chamber of sealed cavity 106, the 5th radial hole 107, one-way valve 105, one-way valve throttle orifice 108 to first through hole formation throttling oil circuit.When one-way valve 105 is opened, the filler opening of first through hole, one-way valve 105 and oil outlet, the 5th radial hole 107 also can form oil circuit to sealed cavity 106.

First segment discharge orifice 104 is arranged on the first tapped hole one end away from rod chamber 7, and the aperture of first segment discharge orifice 104 is less than the external diameter of the first elastic component 103, and first segment discharge orifice 104 is communicated with oil cylinder outlet 6 and first through hole.

The working procedure of buffering end slowdown module 10 is as follows:

Buffer deceleration bar 102 extends in rod chamber 7, and when piston 4 moves to buffer deceleration bar 102 position, promotion buffer deceleration bar 102 compresses the first elastic component 103 and moves, and buffering end slowdown module 10 starts action.

When piston 4 move to contact with buffer deceleration bar 102 time, buffer deceleration bar 102 is under the oil liquid pressure acting in conjunction of the first elastic component 103, oil cylinder outlet 6, to piston 4 one opposition, along with the motion of piston 4, buffer deceleration bar 102 continues compression first elastic component 103, to the first elastic component 103 direction motion.

Guide sleeve 1 is provided with first segment discharge orifice 104, the pressure oil of oil cylinder outlet 6 enters first through hole through first segment discharge orifice 104, along with buffer deceleration bar 102 continues to the first elastic component 103 direction motion, sealed cavity 106 volume increases gradually, sealed cavity 106 internal pressure is caused to reduce, one-way valve 105 internal pressure be communicated with sealed cavity 106 by the 5th radial hole 107 is reduced, one-way valve 105 is under the oil liquid pressure acting in conjunction in the oil liquid pressure and one-way valve 105 of oil cylinder outlet 6, be in opening state, the fluid of oil cylinder outlet 6 is successively through first segment discharge orifice 104, first through hole, one-way valve 105, 5th radial hole 107 enters in sealed cavity 106, buffer deceleration bar 102 can be continued to the first elastic component 103 direction motion.Along with buffer deceleration bar 102 continues to the first elastic component 103 direction motion, the reverse drag effect of the first elastic component 103 pairs of pistons 4 increases gradually, effectively can control buffering end piston rod 5 movement velocity lower than required value.

Buffering terminates, during piston rod 5 retraction movement, buffer deceleration bar 102 starts to move to the direction away from the first elastic component 103, sealed cavity 106 volume reduces gradually, one-way valve 105 internal pressure be communicated with sealed cavity 106 by the 5th radial hole 107 is raised, one-way valve 105 is under the oil liquid pressure acting in conjunction in the oil liquid pressure and one-way valve 105 of oil cylinder outlet 6, be in closed condition, fluid in sealed cavity 106 is successively through the 5th radial hole 107, the spring chamber of one-way valve 105, one-way valve throttle orifice 108 flows to first through hole with limited speed, then oil cylinder outlet 6 is flowed to through first segment discharge orifice 104, due to the throttling action of first segment discharge orifice 104 and the effect of sealed cavity 106, the reversing motion speed of buffer deceleration bar 102 can be controlled, avoid the reverse impact to piston 4.

In the various embodiments described above, buffering end slowdown module 10 is for reducing the buffer speed of buffering end, buffer deceleration bar 102 extends in rod chamber 7, when piston 4 moves to buffer deceleration bar 102 position, buffering end slowdown module 10 starts action, first elastic component 103 provides resistance by 102 pairs of piston 4 motions of buffer deceleration bar, and the first elastic component 103 can adopt spring, or the elastomer of other spring-like also can be adopted to substitute spring; Be provided with several seal ring in buffering end slowdown module 10 and (in such as Fig. 5, between the first deceleration bar section and first through hole, two seal rings be set, a seal ring is set between the 3rd deceleration bar section and the first small through hole), be beneficial to form sealed cavity 106, for realizing the keying of one-way valve 105, sealing can be formed by the seal form of cooperation or other types; One-way valve 105 is provided with in buffering end slowdown module 10, one-way valve 105 offers one-way valve throttle orifice 108, for during to avoid piston rod 5 retraction movement, buffer deceleration bar 102 pairs of pistons 4 form reverse impact, and the position of one-way valve throttle orifice 108 can be opened on the spool of one-way valve 105.

As illustrated in figs. 8-11, according to the terminal pressure requirement of rod chamber 7, the buffer module that the utility model provides comprises buffering end pressure-reduction module 20, by regulating enable possition and the cracking pressure of buffering end pressure-reduction module 20, control buffering end maximum pressure, prevent oil cylinder tip speed to fluctuate.Wherein, regulate the housing in buffering end pressure-reduction module 20 to be the second housing 201, buffer bar is hollow stem 202, and resilient snubber is the second elastic component 203, and throttle orifice is second section discharge orifice 204.Buffering end pressure-reduction module 20 also comprises end cap 205.

Guide sleeve 1 offers the second tapped hole, second tapped hole comprises second largest tapped hole and second orifice, the aperture of second largest tapped hole is greater than the aperture of second orifice, and second largest tapped hole relative to second orifice near rod chamber 7, the aperture of second orifice and the external diameter of the second housing 201 are quite (equal or almost equal), a part for second housing 201 is positioned at second orifice, other parts of second housing 201 are positioned at second largest tapped hole, end cap 205 is arranged in second largest tapped hole, and end cap 205 is provided with outside thread, end cap 205 is threaded connection and is arranged in second largest tapped hole, and then whole buffering end pressure-reduction module 20 is fixed in the second tapped hole of guide sleeve 1.

Second housing 201 is provided with the 3rd axial bore near one end of rod chamber 7, and the second elastic component 203 is arranged in the 3rd axial bore, and one end of hollow stem 202 is arranged in the 3rd axial bore, and the other end of hollow stem 202 is positioned at rod chamber 7 through end cap 205.The end that hollow stem 202 is positioned at the 3rd axial bore is provided with outward extending first step, 3rd axial bore is provided with the second step extended internally near the end of rod chamber 7, first step and second step cooperatively interact, and restriction hollow stem 202 is from the 3rd axial bore landing.Hollow stem 202 can compress or release the second elastic component 203 in the 3rd axial bore in to-and-fro motion.

Annular chamber 206 is formed between the second housing 201 in second largest tapped hole and guide sleeve 1, annular chamber 206 is for being communicated with second section discharge orifice 204, hollow stem 202 is provided with the hollow stem oil circuit that fluid is communicated with rod chamber 7 and the 3rd axial bore, on second housing 201, on it, the position of second step is provided with the 3rd radial hole 209, 3rd radial hole 209 is for being communicated with hollow stem oil circuit in the 3rd axial bore and annular chamber 206, under the state that hollow stem 202 compresses the second elastic component 203, rod chamber 7 fluid is communicated with hollow stem oil circuit, 3rd radial hole 209 and annular chamber 206.

Hollow stem oil circuit comprises the second through hole be arranged on vertically in hollow stem 202, one end that hollow stem 202 is positioned at rod chamber 7 is provided with at least one first radial hole 207, hollow stem 202 position of first step on it is provided with at least one second radial hole 208, first radial hole 207 is communicated with rod chamber 7 and the second through hole, second radial hole 208 is communicated with the second through hole, under the state that hollow stem 202 compresses the second elastic component 203, the second radial hole 208 can also be communicated with the 3rd radial hole 209.

Because hollow stem 202 is hollow-core construction, fluid in rod chamber 7 through hollow stem oil circuit and the second elastic component 203 acting in conjunction on hollow stem 202, be squeezed on the second step of end cap 205, second radial hole 208 was cut off with being communicated with of annular chamber 206,3rd radial hole 209 is cut off with hollow stem oil circuit, when promotion hollow stem 202, when making hollow stem 202 compress the second elastic component 203 to left movement, the second through hole in hollow stem 202 can be made to be communicated with the 3rd radial hole 209 by the second radial hole 208.

Second housing 201 is also provided with the second axial bore away from one end of rod chamber 7, annular chamber 206 is communicated with second section discharge orifice 204 by the second axial bore fluid, the 3rd elastic component 210 and throttling rod 211 is provided with in second axial bore, throttling rod 211 can compress or release the 3rd elastic component 210 in the second axial bore in to-and-fro motion, when oil pressure in annular chamber 206 reaches setting value, throttling rod 211 compresses the 3rd elastic component 210, annular chamber 206, second axial bore is communicated with second section discharge orifice 204 fluid, when oil pressure in annular chamber 206 is less than setting value, throttling rod 211 is under the effect of the 3rd elastic component 210, oil circuit between annular chamber 206 and the second axial bore is closed.

Alternatively, second axial bore is shoulder hole, second axial bore comprises second largest axial bore and the second little axial bore, the aperture of second largest axial bore is greater than the aperture of the second little axial bore, second largest axial bore and the joint of the second little axial bore adopt the first inclined-plane throat structure transition to be connected, the second little axial bore relative to second largest axial bore near rod chamber 7.

Throttling rod 211 and the 3rd elastic component 210 are arranged in second largest axial bore, the bar footpath of throttling rod 211 and the aperture of second largest axial bore are quite (equal or almost equal), the bar footpath of throttling rod 211 is greater than the aperture of the second little axial bore, the circumference of second largest axial bore is provided with at least one the first axial notches, form the first flow channels 212, first flow channels 212 between throttling rod 211 and the first axial notch and be communicated with second section discharge orifice 204.

Second little axial bore is provided with at least one the 4th radial hole the 214, four radial hole 214 and is communicated with the second little axial bore near one end of rod chamber 7, be also communicated with annular chamber 206.When throttling rod 211 compresses the 3rd elastic component 210, annular chamber 206, 4th radial hole 214, second little axial bore is communicated with the first flow channels 212 fluid, when throttling rod 211 discharges the 3rd elastic component 210 to the second little axial bore direction motion, bar footpath due to throttling rod 211 is greater than the aperture of the second little axial bore, being communicated with between the second little axial bore with the first flow channels 212 can be closed by throttling rod 211, and mineralization pressure regulates chamber 213 between throttling rod 211 and the first inclined-plane throat structure, fluid in second little axial bore is not communicated with the fluid in the first flow channels 212 with second largest axial bore.

Further, the 3rd elastic component 210 can adopt the 3rd spring, and the external diameter of the 3rd spring is not more than the bar footpath of throttling rod 211.

In above-mentioned illustrative examples, second section discharge orifice 204 is arranged on the second tapped hole one end away from rod chamber 7 of guide sleeve 1, the aperture of second section discharge orifice 204 is less than the external diameter of the 3rd elastic component 210, and second section discharge orifice 204 is communicated with oil cylinder outlet 6 and second largest axial bore that guide sleeve 1 is arranged.

Alternatively, also block is provided with in annular chamber 206, the position of block specifically on the outer wall of the second housing 201 between the 3rd axial bore and the second axial bore, the external diameter of block and the external diameter of second largest tapped hole are quite (equal or almost equal), annular chamber 206 is divided into the first annular chamber and the second annular chamber by block, first annular chamber is positioned at the side of the 3rd axial bore, and the second annular chamber is positioned at the side of the second axial bore.Block is provided with at least one block through hole 215, block through hole 215 is communicated with the first annular chamber and the second annular chamber.

The working procedure of buffering end pressure-reduction module 20 is as follows:

Hollow stem 202 extends in rod chamber 7, when piston 4 extend out to hollow stem 202 position, promote hollow stem 202 and compress the second elastic component 203, buffering end pressure-reduction module 20 starts action, now, by the first radial hole 207 on hollow stem 202, the second through hole in hollow stem 202, the second radial hole 208 on hollow stem 202, 3rd axial bore, 3rd radial hole 209, the first annular chamber between second housing 201 and second largest tapped hole, block through hole 215, the second annular chamber between second housing 201 and second largest tapped hole, 4th radial hole 214, second axial aperture is communicated with successively, form the oil circuit between rod chamber 7 to pressure regulating cavity 213, in rod chamber 7, fluid can act on throttling rod 211.

The second tapped hole that guide sleeve 1 is arranged is provided with second section discharge orifice 204 away from one end of rod chamber 7, the aperture of second section discharge orifice 204 is less than the external diameter of the 3rd elastic component 210, and second section discharge orifice 204 is communicated with oil cylinder outlet 6 and second largest axial bore that guide sleeve 1 is arranged.

Buffering end pressure-reduction module 20 and oil cylinder are provided with second section discharge orifice 204 between exporting 6, when (orientation shown in Fig. 9) motion left under the oil liquid pressure effect of throttling rod 211 in rod chamber 7, when compressing the 3rd elastic component 210, fluid in rod chamber 7 enters second largest axial bore from pressure regulating cavity 213, and flows to oil cylinder outlet 6 by second section discharge orifice 204.

In sum, buffering end pressure-reduction module 20 in its natural state, be pressed on the second step of the second housing 201 under the acting in conjunction of the oil liquid pressure of hollow stem 202 in rod chamber 7 and the second elastic component 203, the oil circuit of the second radial hole 208 to the three radial hole 209 is cut off.Fluid in oil cylinder outlet 6 acts on throttling rod 211 through second section discharge orifice 204, under the acting in conjunction of the oil liquid pressure of throttling rod 211 in oil cylinder outlet 6 and the 3rd elastic component 210, oil cylinder outlet 6 is cut off to the oil circuit of annular chamber 206.

When piston 4 move to contact with hollow stem 202 time, piston 4 promotes hollow stem 202 and moves to the second elastic component 203 direction, piston 4 is fitted with the end face of hollow stem 202 simultaneously, fluid in rod chamber 7 is successively through the first radial hole 207, second radial hole 208, 3rd radial hole 209, block through hole 215, 4th radial hole 214, pressure regulating cavity 213 acts on throttling rod 211, if the oil liquid pressure in rod chamber 7 is greater than limit value, then oil liquid pressure promotion throttling rod 211 compresses the 3rd elastic component 210, fluid is successively through the first flow channels 212, second section discharge orifice 204 flows to oil cylinder outlet 6, oil liquid pressure in rod chamber 7 reduces.

In the various embodiments described above, buffering end pressure-reduction module 20, for controlling the compensator or trimmer pressure of buffering end, is fixed in guide sleeve 1 by end cap 205 or other devices; Be provided with the hollow stem 202 controlling buffering end pressure-reduction module 20 operating position in buffering end pressure-reduction module 20, hollow stem 202, second housing 202 offers multiple hole, form the runner between rod chamber 7 to oil cylinder outlet 6; Hollow stem 202 is pressed on the shoulder position of the second housing 202 right-hand member by elastic force and oil liquid pressure, form sealing, cut off the runner between rod chamber 7 to oil cylinder outlet 6, second elastic component 203 and the 3rd elastic component 210 all can adopt spring, or the elastomer of other spring-like also can be adopted to substitute spring.

As shown in figs. 12-15, according to the highest compensator or trimmer pressure designing requirement, the buffer module that the utility model provides comprises buffering surge pressure adjustment module 30, by arranging the cracking pressure of buffering surge pressure adjustment module 30, the most high shock pressure of buffer stage rod chamber 7 is effectively controlled under designing requirement pressure.Wherein, the housing in buffering surge pressure adjustment module 30 is the 3rd housing 301, and buffer bar is pressure adjusting lever 302, and resilient snubber is the 4th elastic component 303, and throttle orifice is the 3rd throttle orifice 304.

Guide sleeve 1 offers the 3rd tapped hole, the 3rd housing 301 is provided with outside thread, the 3rd housing 301 is threaded connection and is arranged in the 3rd tapped hole, and then whole buffering surge pressure adjustment module 30 is fixed in guide sleeve 1.

Third through-hole 306 is provided with vertically in 3rd housing 301, 4th elastic component 303 and pressure adjusting lever 302 are arranged in third through-hole 306, third through-hole 306 is communicated with the 3rd throttle orifice 304, pressure adjusting lever 302 can compress or release the 4th elastic component 303 in third through-hole 306 in to-and-fro motion, under the state that pressure adjusting lever 302 compresses the 4th elastic component 303, rod chamber 7, third through-hole 306 is communicated with the 3rd throttle orifice 304 fluid, pressure adjusting lever 302 discharges the 4th elastic component 303, under the effect of the 4th elastic component 303, rod chamber 7 is closed to the oil circuit in third through-hole 306 by pressure adjusting lever 302.

Alternatively, third through-hole 306 is shoulder hole, comprises the third-largest through hole and the 3rd small through hole, and the aperture of the third-largest through hole is greater than the aperture of the 3rd small through hole.3rd small through hole relative to the third-largest through hole near rod chamber 7.The third-largest through hole and the joint of the 3rd small through hole adopt the second inclined-plane throat structure transition to be connected.

4th elastic component 303 and pressure adjusting lever 302 are all arranged in the third-largest through hole, and the third-largest through hole is communicated with the 3rd throttle orifice the 304, three small through hole and is communicated with rod chamber 7,

The bar footpath of pressure adjusting lever 302 and the aperture of the third-largest through hole are quite (equal or almost equal), the bar footpath of pressure adjusting lever 302 is greater than the aperture of the 3rd small through hole, the circumference of the third-largest through hole is provided with at least one the second axial notches, the second flow channels 305 is formed between pressure adjusting lever 302 and the second axial notch, when pressure adjusting lever 302 compresses the 4th elastic component 303, rod chamber 7, 3rd small through hole, second flow channels 305 is communicated with the 3rd throttle orifice 304 fluid, pressure adjusting lever 302 discharges the 4th elastic component 303 and moves to the 3rd small through hole direction, bar footpath due to pressure adjusting lever 302 is greater than the aperture of the 3rd small through hole, oil circuit between 3rd small through hole and the second flow channels 305 can be closed by pressure adjusting lever 302, fluid in 3rd small through hole is not communicated with the fluid in the second flow channels 305 with the third-largest through hole.

Further, the 4th elastic component 303 can adopt the 4th spring, and the external diameter of the 4th spring is not more than the bar footpath of pressure adjusting lever 302.

In above-described embodiment, 3rd throttle orifice 304 to be arranged on guide sleeve 1 the 3rd tapped hole away from one end of piston 4, the aperture of the 3rd throttle orifice 304 is less than the external diameter of the 4th elastic component 303, and the 3rd throttle orifice 304 is communicated with oil cylinder outlet 6 and the third-largest through hole that guide sleeve 1 is arranged.

The working procedure of buffering surge pressure adjustment module 30 is as follows:

Buffering surge pressure adjustment module 30 and oil cylinder are provided with the 3rd throttle orifice 304 between exporting 6, when under the oil liquid pressure effect of pressure adjusting lever 302 in rod chamber 7, compression the 4th elastic component 303 moves, the fluid in rod chamber 7 flows to oil cylinder outlet 6 by the 3rd throttle orifice 304.

Before piston rod 5 stretches out, fluid in rod chamber 7 to act on the left side of pressure adjusting lever 302 through the 3rd small through hole fluid acted in the right side of pressure adjusting lever 302, oil cylinder outlet 6 through the 3rd throttle orifice 304, under the 4th elastic component 303 preset pressure effect, pressure adjusting lever 302 is pressed on the second inclined-plane throat structure in the 3rd housing 301, and form throttleng surface with coordinating between the second inclined-plane throat structure, close between the 3rd small through hole and the third-largest through hole, therefore, the second flow channels 305 is closed.

Piston rod 5 stretches out in process, when the oil liquid pressure in rod chamber 7 is higher than compensator or trimmer pressure limits value, the 4th elastic component 303 is compressed under the oil liquid pressure effect of pressure adjusting lever 302 in rod chamber 7, pressure adjusting lever 302 leaves the second inclined-plane throat structure, 3rd small through hole is communicated with the third-largest through hole, second flow channels 305 is opened in short-term, fluid in rod chamber 7 is through the 3rd small through hole, the third-largest through hole, the second flow channels 305, the 3rd throttle orifice 304, flow to oil cylinder outlet 6, buffering peak impact pressure.

In the various embodiments described above, buffering surge pressure adjustment module 30, for regulating the surge pressure in buffering course, is fixed in guide sleeve 1 by scyewed joint or other forms; Pressure adjusting lever 302 in buffering surge pressure adjustment module 30 and the 3rd housing 301 internal engagement form throttleng surface, can adopt linear sealing or surface seal structure when this throttleng surface is in closed condition; Buffering surge pressure adjustment module 30 and oil cylinder offer the 3rd throttle orifice the 304, three throttle orifice 304 aperture between exporting 6 can be arranged according to buffer requirements.

In the illustrative examples of the guiding damping device that above-mentioned the utility model provides, according to different compensator or trimmer pressures and buffer speed requirement, different buffer modules can be selected to carry out function combination, therefore, buffer module can comprise the one in buffering end slowdown module 10, buffering end pressure-reduction module 20, buffering surge pressure adjustment module 30, or comprise the combination of wherein two kinds, or comprise the combination of three kinds.Each function module both can work separately, also can combination in any, optimized buffer structure.The quantity of buffering end pressure-reduction module 20, buffering surge pressure adjustment module 30 and buffering end slowdown module 10 can adjust according to buffer requirements.

One preferably or in embodiment, buffering surge pressure adjustment module 30, buffering end pressure-reduction module 20 and two buffering end slowdown modules 10 can be integrated with in the guide sleeve 1 of guiding damping device, two buffering end slowdown modules 10 are symmetrical, and each module all can be fixed in guide sleeve 1 respectively by being threaded.Buffering end slowdown module 10 is distributed on guide sleeve 1, and its quantity can be arranged according to different buffer requirements, and for avoiding unbalance loading, the guide sleeve 1 in the present embodiment is symmetrical arranged two buffering end slowdown modules 10.

One preferably or in embodiment, integrated buffering surge pressure adjustment module 30, buffering end pressure-reduction module 20 and buffering end slowdown module 10 in guide sleeve 1, resolve buffer surge pressure, buffering end pressure, buffering end speed three design objectives are large by current structure optimizing difficulty, cannot obtain the problem of optimized buffer performance.Simultaneously by integrated three kinds of shock-absorbing capacity controlling devices, reduce cushion collar 3 and coordinate requirement with the buffer gap between guide sleeve 1, improve the reliability of oil cylinder.

The utility model additionally provides a kind of hydraulic jack, and it comprises the guiding damping device in above-mentioned any embodiment.

The utility model additionally provides a kind of excavator, and it comprises the hydraulic jack in above-mentioned any embodiment.

By the description of each embodiment above-mentioned, the utility model can be derived and at least have the following advantages:

1) the utility model integrated buffering end slowdown module 10 in guide sleeve 1, effectively can reduce buffering end piston rod 5 movement velocity, avoids piston 4 and guide sleeve 1 to collide.

2) the buffering end slowdown module 10 that provides of the utility model, when piston 4 slows down, one-way valve 105 is opened, and fluid, by one-way valve 105 repairing, realizes deceleration; Piston 4 slows down after stopping, and one-way valve 105 is closed, and fluid, by throttle orifice throttling, controls deceleration bar reversing motion speed, avoids reverse impact.

3) the utility model integrated buffering end pressure-reduction module 20 in guide sleeve 1, can effectively control buffering end pressure, avoid the tip speed fluctuation of oil cylinder under complete machine service condition, realize the robust motion of oil cylinder, improve operation comfort and the working efficiency of complete machine.

4) be provided with pressure adjusting spring in the buffering end pressure-reduction module 20 that the utility model provides, can preset the cracking pressure of buffering end pressure-reduction module 20, adapt under different buffer conditions terminal pressure requirement.

5) the buffering end pressure-reduction module 20 that provides of the utility model is by the initial control position of hollow stem 202 length setting buffering end pressure, avoids oil cylinder working-pressure and to decline suddenly the impact and noise that cause at end of travel.

6) the buffering end decompressor 20 that the utility model provides sets decompressor control position by hollow stem 202, and two stage pressures achieving buffering surge pressure and buffering end pressure regulate.

7) the buffering end pressure-reduction module 20 that the utility model provides is provided with throttle orifice between oil cylinder outlet 6, limits, effectively control maximum reducing speed to maximum through-current capacity.

8) the utility model integrated buffering surge pressure adjustment module 30 in guide sleeve 1, controls peak impact pressure, avoids the too high damage caused oil cylinder of compensator or trimmer pressure.

9) be provided with pressure adjusting spring in the buffering surge pressure adjustment module 30 that the utility model provides, can preset the cracking pressure of buffering surge pressure adjustment module 30, adapt to different buffering surge pressure requirements.

10) the buffering surge pressure adjustment module 30 that the utility model provides is provided with throttle orifice between oil cylinder outlet 6, limits maximum through-current capacity, while guarantee maximum cushioning pressure, can avoid oil cylinder velocity jump.

11) guide sleeve 1 that the utility model provides adopts modular design, inner integrated buffering surge pressure adjustment module 30, buffering end pressure-reduction module 20 and buffering end slowdown module 10, three kinds of devices all adopt scyewed joint, are easy to change adjustment, reduce debugging and maintenance difficulties.

12) each function module that the utility model provides both can work separately, also any function combination can be carried out according to design needs, binding buffer gap effectively balances buffering surge pressure, buffering end pressure and buffer speed three Technique performance parameter, optimizes buffer structure further.

Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although be described in detail the utility model with reference to preferred embodiment, those of ordinary skill in the field have been to be understood that: still can modify to embodiment of the present utility model or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technological scheme scope of the utility model request protection.

Claims

1. a guiding damping device, comprise cylinder barrel (2), guide sleeve (1), piston (4) and piston rod (5), described guide sleeve (1) is arranged on described cylinder barrel (2), described piston (4) is arranged in described cylinder barrel (2), one end of described piston rod (5) connects described piston (4), the other end of described piston rod (5) passes described guide sleeve (1), in described cylinder barrel (2), the chamber at described piston rod (5) place is rod chamber (7), described guide sleeve (1) is provided with oil cylinder outlet (6), it is characterized in that: (1) is provided with at least one buffer module with described guide sleeve, described buffer module comprises housing, buffer bar and resilient snubber is provided with in described housing, in the process that described piston rod (5) stretches out to described guide sleeve (1) direction, described buffer bar extrudes described resilient snubber under the effect of described piston (4) and described rod chamber (7) oil pressure, and that slows down described piston rod (5) by the elastic force of described resilient snubber and the oil pressure of described rod chamber (7) stretches out speed.

2. lead damping device as claimed in claim 1, it is characterized in that: all corresponding throttle orifice be arranged on described guide sleeve (1) of each described buffer module, described throttle orifice is communicated with described buffer module corresponding to it and described oil cylinder outlet (6).

3. lead damping device as claimed in claim 2, it is characterized in that: described buffer module comprises buffering end slowdown module (10), described housing comprises the first housing (101), described buffer bar comprises buffer deceleration bar (102), described resilient snubber comprises the first elastic component (103), described throttle orifice comprises first segment discharge orifice (104), described buffering end slowdown module (10) also comprises one-way valve (105), the first through hole is provided with in described first housing (101), described one-way valve (105) and described first elastic component (103) are all arranged in described first through hole, one end of described buffer deceleration bar (102) is positioned at described first through hole, the other end of described buffer deceleration bar (102) is positioned at described rod chamber (7), described buffer deceleration bar (102) can to-and-fro motion be compressed or discharge described first elastic component (103) in described first through hole, described buffer deceleration bar (102) the position of described first through hole can and the inwall of described first through hole between form sealed cavity (106), described buffer deceleration bar (102) is provided with the oil circuit for being communicated with described sealed cavity (106) and described one-way valve (105) oil outlet, the filler opening of described one-way valve (105) is communicated with described first through hole, described first through hole is also communicated with described first segment discharge orifice (104).

4. lead damping device as claimed in claim 3, it is characterized in that: described one-way valve (105) is also provided with one-way valve throttle orifice (108), described one-way valve throttle orifice (108) is communicated with spring chamber in described one-way valve (105) and described first through hole.

5. lead damping device as claimed in claim 3, it is characterized in that: described first through hole comprises the first through hole and the first small through hole that aperture reduces successively, described buffer deceleration bar (102) comprises the first deceleration bar section that bar footpath reduces successively, second deceleration bar section and the 3rd deceleration bar section, described first deceleration bar section, described second deceleration bar section and described first elastic component (103) are all positioned at described first through hole, described buffer deceleration bar (102) is in described first through hole under reciprocating state, one end of described 3rd deceleration bar section is positioned at described first through hole or is positioned at described first small through hole, the other end of described 3rd deceleration bar section passes described first small through hole and is positioned at described rod chamber (7), the bar footpath of described first deceleration bar section is suitable with the aperture of described first through hole, the bar footpath of described second deceleration bar section is less than the aperture of described first through hole, be greater than the aperture of described first small through hole, the bar footpath of described 3rd deceleration bar section is suitable with the aperture of described first small through hole, described buffer deceleration bar (102) is in described first through hole under reciprocating state, described second deceleration bar section can and described first through hole between form described sealed cavity (106), or form described sealed cavity (106) between described second deceleration bar section and the common and described first through hole of the described 3rd deceleration bar section of part.

6. lead damping device as claimed in claim 5, it is characterized in that: in described first deceleration bar section, be provided with the first axial bore, the oil outlet of described one-way valve (105) is arranged in described first axial bore, second deceleration bar section is provided with at least one the 5th radial hole (107), described 5th radial hole (107) is communicated with oil outlet and the described sealed cavity (106) of described one-way valve (105).

7. lead damping device as claimed in claim 2, it is characterized in that: described buffer module comprises buffering end pressure-reduction module (20), described housing comprises the second housing (201), described buffer bar comprises hollow stem (202), described resilient snubber comprises the second elastic component (203), described throttle orifice comprises second section discharge orifice (204), the 3rd axial bore is provided with in described second housing (201), described second elastic component (203) is arranged in described 3rd axial bore, one end of described hollow stem (202) is positioned at described 3rd axial bore, the other end of described hollow stem (202) is positioned at described rod chamber (7), described hollow stem (202) can to-and-fro motion compress or discharge described second elastic component (203) in described 3rd axial bore, annular chamber (206) is formed between described second housing (201) and described guide sleeve (1), described annular chamber (206) is for being communicated with described second section discharge orifice (204), described hollow stem (202) is provided with the hollow stem oil circuit for being communicated with described rod chamber (7) and described 3rd axial bore, described second housing (201) is provided with the 3rd radial hole (209) for being communicated with described hollow stem oil circuit and described annular chamber (206), under the state that described hollow stem (202) compresses described second elastic component (203), described rod chamber (7) fluid is communicated with described hollow stem oil circuit, described 3rd radial hole (209) and described annular chamber (206).

8. lead damping device as claimed in claim 7, it is characterized in that: described hollow stem oil circuit comprises the second through hole be arranged in described hollow stem (202), also comprise the first radial hole (207) being arranged on described hollow stem (202) one end, with the second radial hole (208) being arranged on described hollow stem (202) the other end, described first radial hole (207) is communicated with described rod chamber (7) and described second through hole, described second radial hole (208) is communicated with described second through hole, under the state that described hollow stem (202) compresses described second elastic component (203), described second radial hole (208) can also be communicated with described 3rd radial hole (209).

9. lead damping device as claimed in claim 7, it is characterized in that: in described second housing (201), be also provided with the second axial bore, described annular chamber (206) is communicated with described second section discharge orifice (204) by described second axial bore, the 3rd elastic component (210) and throttling rod (211) is provided with in described second axial bore, described throttling rod (211) can to-and-fro motion compress or discharge described 3rd elastic component (210) in described second axial bore, when oil pressure in described annular chamber (206) reaches setting value, described throttling rod (211) compresses described 3rd elastic component (210), described annular chamber (206), described second axial bore is communicated with described second section discharge orifice (204) fluid, when oil pressure in described annular chamber (206) is less than setting value, described throttling rod (211) is under the effect of described 3rd elastic component (210), oil circuit between described annular chamber (206) and described second axial bore is closed.

10. lead damping device as claimed in claim 9, it is characterized in that: described second axial bore comprises the second largest axial bore and the second little axial bore that aperture reduces successively, described throttling rod (211) and described 3rd elastic component (210) are arranged in described second largest axial bore, the bar footpath of described throttling rod (211) is suitable with the aperture of described second largest axial bore, the bar footpath of described throttling rod (211) is greater than the aperture of described second little axial bore, the circumference of described second largest axial bore is provided with at least one the first axial notches, the first flow channels (212) is formed between described throttling rod (211) and described first axial notch, described first flow channels (212) is communicated with described second section discharge orifice (204), when described throttling rod (211) compresses described 3rd elastic component (210), described annular chamber (206), described second little axial bore is communicated with described first flow channels (212) fluid, when described throttling rod (211) discharges described 3rd elastic component (210) to described second little axial bore direction motion, bar footpath due to described throttling rod (211) is greater than the aperture of described second little axial bore, being communicated with between described second little axial bore with described first flow channels (212) can be closed by described throttling rod (211).

11. lead damping device as claimed in claim 7, it is characterized in that: described annular chamber is also provided with block in (206), described annular chamber (206) is divided into the first annular chamber and the second annular chamber by described block, described block is provided with the block through hole (215) being communicated with described first annular chamber and described second annular chamber.

12. lead damping device as claimed in claim 2, it is characterized in that: described buffer module comprises buffering surge pressure adjustment module (30), described housing comprises the 3rd housing (301), described buffer bar comprises pressure adjusting lever (302), described resilient snubber comprises the 4th elastic component (303), described throttle orifice comprises the 3rd throttle orifice (304), third through-hole (306) is provided with in described 3rd housing (301), described 4th elastic component (303) and described pressure adjusting lever (302) are arranged in described third through-hole (306), described third through-hole (306) is communicated with described 3rd throttle orifice (304), described pressure adjusting lever (302) can to-and-fro motion compress or discharge described 4th elastic component (303) in described third through-hole (306), under the state that described pressure adjusting lever (302) compresses described 4th elastic component (303), described rod chamber (7), described third through-hole (306) is communicated with described 3rd throttle orifice (304) fluid, described pressure adjusting lever (302) discharges described 4th elastic component (303), under the effect of described 4th elastic component (303), described rod chamber (7) is closed to the oil circuit in described third through-hole (306) by described pressure adjusting lever (302).

13. as the guiding damping device of claim 12, it is characterized in that: described third through-hole (306) comprises the third-largest through hole and the 3rd small through hole that aperture reduces successively, described 4th elastic component (303) and described pressure adjusting lever (302) are all arranged in described the third-largest through hole, described the third-largest through hole is communicated with described 3rd throttle orifice (304), described 3rd small through hole is communicated with described rod chamber (7), the bar footpath of described pressure adjusting lever (302) is suitable with the aperture of described the third-largest through hole, the bar footpath of described pressure adjusting lever (302) is greater than the aperture of described 3rd small through hole, the circumference of described the third-largest through hole is provided with at least one the second axial notches, the second flow channels (305) is formed between described pressure adjusting lever (302) and described second axial notch, when described pressure adjusting lever (302) compresses described 4th elastic component (303), described rod chamber (7), described 3rd small through hole, described second flow channels (305) is communicated with described 3rd throttle orifice (304) fluid, described pressure adjusting lever (302) discharges described 4th elastic component (303) to described 3rd small through hole direction motion, oil circuit between described 3rd small through hole and described second flow channels (305) can be closed by described pressure adjusting lever (302).

14. 1 kinds of hydraulic jacks, is characterized in that: comprise the guiding damping device as described in any one of claim 1-13.

15. 1 kinds of excavators, is characterized in that: comprise hydraulic jack as claimed in claim 14.