CN116146565A

CN116146565A - Bidirectional adjusting buffer hydraulic cylinder

Info

Publication number: CN116146565A
Application number: CN202211725116.2A
Authority: CN
Inventors: 夏欣; 季勇; 杨成标
Original assignee: Shandong Xingao Hydraulic Machinery Co ltd
Current assignee: Shandong Xingao Hydraulic Machinery Co ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-05-23

Abstract

The invention relates to a bidirectional adjusting buffer hydraulic cylinder, which comprises a cylinder barrel, a piston rod, a buffer pin and a buffer sleeve, wherein a cylinder cover is arranged at one end of the cylinder barrel, a small cavity oil inlet and a large cavity oil inlet are respectively arranged at two ends of the cylinder barrel, the piston rod is arranged in the cylinder barrel in a sliding manner, a piston block is fixedly arranged at one end of the piston rod through a piston nut, a stop ring is connected to one end of the buffer pin, the stop ring is arranged at the bottom end of the piston rod, and a buffer groove is formed in the inner bottom wall of the cylinder barrel; according to the invention, the buffer pin and the buffer sleeve are adopted for bidirectional adjustment buffer, so that the piston rod can be buffered when being retracted and extended, and the damage of parts caused by poor buffer effect is avoided: the large-cavity throttle valve and the small-cavity throttle valve can be regulated or replaced according to actual use conditions, and the buffering effect of the hydraulic oil cylinder is accurately controlled, so that the buffering performance of the oil cylinder is optimal.

Description

Bidirectional adjusting buffer hydraulic cylinder

Technical Field

The invention relates to the technical field of hydraulic cylinders, in particular to a bidirectional adjusting buffer hydraulic cylinder.

Background

The piston movement speed of the hydraulic cylinder of the engineering machinery such as the excavator is higher and higher, the reciprocating frequency and the movement speed are higher and higher, and some hydraulic cylinders are even tens of meters per second, so that the system is ensured to work stably, the transmission parts are prevented from being damaged, the working performance of the system is improved, and the system is required to be buffered before the movement is finished.

In order to further understand the hydraulic cylinder buffer structure in the prior art, the following bulletin numbers are searched: chinese patent CN202867421U discloses a cylinder buffer structure, where the cylinder has a cylinder body and a piston, the bottom of the cylinder body has a choke chamber, and the sidewall of the cylinder body has air holes, and the air holes are communicated with the choke chamber; a step-shaped sealing rod corresponding to the cylinder block air chamber is fixed on the rodless end face of the piston; the air blocking chamber is of a square cavity structure and has a resistance effect on air flow; the sealing rod has three steps, the length and width of which decrease in sequence starting from the piston.

Through exploration and analysis, the patent has the following defects when in actual use: in this patent only the buffering is performed by means of a set of sealing bars and a gas-barrier chamber, so that only the retracted cylinder piston rod can be buffered, but not when the piston rod is extended, so that there is still a risk of damaging the parts.

In summary, the present application provides a bidirectional adjusting buffer hydraulic cylinder to solve the above-mentioned problems.

Disclosure of Invention

The invention aims to provide a bidirectional adjusting buffer hydraulic cylinder, which solves the problem that in the prior art, only a set of sealing rods and a gas blocking chamber are used for buffering, so that only a retracted hydraulic cylinder piston rod can be buffered, but the piston rod cannot be buffered when extending, and the risk of damaging parts still exists.

In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a two-way regulation buffering pneumatic cylinder, includes cylinder, piston rod, buffer pin and cushion collar, the cylinder cap is installed to the one end of cylinder, the both ends of cylinder are equipped with little chamber oil inlet and big chamber oil inlet respectively, the piston rod slides and sets up in the cylinder, piston nut fixed mounting is passed through to the one end of piston rod has the piston block, the one end of buffer pin is connected with the snap ring, the bottom at the piston rod is installed to the snap ring, the interior bottom wall of cylinder is equipped with the dashpot, the outside at the piston rod is established to the cushion collar cover, be equipped with the buffer hole in the cylinder cap.

More preferably, the corresponding buffer groove in the cylinder barrel is provided with a reflux groove, the reflux groove is of an L-shaped structure, and the bottom end of the reflux groove is provided with a threaded hole which is communicated with the outside; the screw plug is arranged in the threaded hole in a threaded manner, the large-cavity throttle valve is fixedly arranged on the screw plug, the spring is fixedly arranged on the large-cavity throttle valve, the cap is fixedly arranged on the spring, and the cap is abutted to the bending part of the reflux groove of the L-shaped structure.

More preferably, an oil drain hole is arranged in the cylinder cover and is communicated with the buffer hole, a through hole is arranged at the bottom end of the oil drain hole, a locking nut is fixedly arranged in the through hole, and a small-cavity throttle valve is fixedly arranged on the locking nut.

More preferably, one end of the buffer pin is provided with three inclined planes.

More preferably, a chamfer is formed at one end of the buffer sleeve to form a conical edge.

More preferably, the ED sealing ring is sleeved outside the screw plug.

More preferably, an O-shaped ring is arranged between the cylinder cover and the cylinder barrel.

More preferably, the buffer pins are slightly movable axially and radially.

The beneficial effects of the invention are as follows:

1. compared with the prior art, the two-way adjusting buffer is carried out by adopting the buffer pin and the buffer sleeve, so that the piston rod can be buffered when being retracted and extended, and the parts are not damaged because of poor buffer effect: the large-cavity throttle valve and the small-cavity throttle valve can be regulated or replaced according to actual use conditions, and the buffering effect of the hydraulic oil cylinder is accurately controlled, so that the buffering performance of the oil cylinder is optimal.

2. Compared with the prior art, the invention also has the function of quick start: when the large cavity is filled with oil, the large cavity throttle valve is pushed open, oil is communicated through the reflux groove, so that the piston block is started quickly, and the starting time is shortened.

Drawings

FIG. 1 is a schematic view of a front cross-sectional structure of the present invention;

FIG. 2 is an enlarged schematic view of the oil inlet area of the small cavity in the invention;

fig. 3 is an enlarged schematic view of the oil inlet area of the large cavity in the present invention.

In the reference numerals: 1. a piston rod; 2. a cylinder cover; 3. a small cavity throttle valve; 4. an O-ring; 5. a lock nut; 6. a buffer sleeve; 7. a piston block; 8. a piston nut; 9. a stop ring; 10. a buffer pin; 11. a cylinder; 12. a large chamber throttle valve; 13. a spring; 14. a cap; 15. ED sealing ring; 16. a screw plug; 17. a small cavity oil inlet; 18. a large cavity oil inlet; 19. a buffer tank; 20. a reflux groove; 21. an oil drain hole; 22. and (5) buffering the holes.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1, 2 and 3, a two-way adjusting buffer hydraulic cylinder comprises a cylinder barrel 11, a piston rod 1, a buffer pin 10 and a buffer sleeve 6.

In this application, install cylinder cap 2 in the one end of cylinder 11, cylinder 11 is used for holding and places piston rod 1, and is equipped with O shape circle 4 between cylinder cap 2 and the cylinder 11 for increase sealing performance, still be equipped with little chamber oil inlet 17 and big chamber oil inlet 18 respectively at the both ends of cylinder 11 simultaneously, be used for getting into high pressure hydraulic oil respectively.

Further, in the present application, the piston rod 1 is slidably disposed in the cylinder 11, one end of the piston rod 1 is fixedly provided with the piston block 7 through the piston nut 8, and the piston block 7 is pushed to slide in the cylinder 11 by hydraulic oil, so that the sliding of the piston rod 1 is realized.

The concrete details are as follows

In this application, be connected with stop ring 9 in the one end of buffer pin 10, the one end of buffer pin 10 is equipped with three inclined planes, stop ring 9 fixed mounting is in the bottom of piston rod 1, the interior bottom wall of cylinder 11 is equipped with buffer groove 19, buffer pin 10 can be axial and radial slightly movable, can set up as follows, if with the spacing flange of side fixed mounting of buffer pin 10, then pass stop ring 9, set up the diameter of buffer pin 10 to slightly less than the diameter of stop ring 9, so alright realization buffer pin 10 can be axially and radial slightly movable, simultaneously, through the effect of spacing flange, can avoid buffer pin 10 to slide out from stop ring 9 and drop.

When the small cavity oil inlet 17 is used for oil feeding, the piston block 7 moves towards the bottom end of the cylinder barrel 11, and the buffer pin 10 floats to enter the buffer groove 19 at the bottom of the cylinder barrel 11, the buffer pin 10 is aligned at a floating angle, and the buffer pin 10 plays a main throttling buffer role through three inclined planes and gaps between the outer circle and the buffer groove 19 at the bottom of the cylinder barrel.

It is obvious that the function of slightly axially and radially movable the buffer pin 10 can also be achieved by other means of connection.

Further describing, the buffer sleeve 6 is sleeved outside the piston rod 1 in a floating way, a buffer hole 22 is arranged in the cylinder cover 2, and one end of the buffer sleeve 6 is provided with a chamfer to form a conical edge; the floating sleeve is arranged in the meaning that the inner wall of the annular sleeve is fixedly connected with an annular sliding bar, the piston rod 1 is provided with an annular sliding groove, the annular sliding bar is slidably arranged on the annular sliding groove, and meanwhile, the size of the annular sliding bar is slightly smaller, so that the buffer sleeve 6 is arranged outside the piston rod 1 in a floating manner.

So when big chamber hydraulic oil promotes piston block 7 to the cylinder cap 2 side and moves, buffer sleeve 6 is about to get into the buffer hole 22 of cylinder cap 2, and hydraulic oil will cushion sleeve 6 through buffer sleeve 6 and the gap of piston rod 1 props up floating state, under the effect of high pressure oil, in the buffer hole 22 that relies on buffer sleeve 6 chamfer and tapering can the automatic alignment to get into cylinder cap 2, when buffer sleeve 6 gets into buffer hole 22, buffer sleeve 6 three even inclined planes and excircle play main throttle cushioning effect with the clearance in cylinder cap 2 buffer hole 22.

Further description;

the corresponding buffer groove 19 in the cylinder 11 is provided with a reflux groove 20, the reflux groove 20 is of an L-shaped structure, the bottom end of the reflux groove 20 is provided with a threaded hole, and the reflux groove is communicated with the outside; the screw plug 16 is arranged in the threaded hole in a threaded manner, the ED sealing ring 15 is sleeved outside the screw plug 16, the large-cavity throttle valve 12 is fixedly arranged on the screw plug 16, the spring 13 is fixedly arranged on the large-cavity throttle valve 12, the cap 14 is fixedly arranged on the spring 13, and the cap 14 is abutted to the bending part of the reflux groove 20 with the L-shaped structure.

When the large cavity oil inlet 18 is filled with oil, the large cavity oil inlet 18 flows in high-pressure hydraulic oil, the thrust of the hydraulic oil is larger than the pressure of the spring 13, the large cavity throttle valve 12 and the cap 14 are retracted, the spring 13 is contracted to the shortest, the hydraulic oil flows into the reflux groove 20 through the gap, then enters the cylinder bottom to push the piston rod 1 to move backwards, the piston rod 1 is helped to extend out rapidly, and the starting time is shortened.

Further refinement

The cylinder cover 2 is internally provided with an oil drain hole 21, the oil drain hole 21 is communicated with the buffer hole 22, the bottom end of the oil drain hole 21 is provided with a through hole, a lock nut 5 is fixedly arranged in the through hole, and a small cavity throttle valve 3 is fixedly arranged on the lock nut 5. When the piston block 7 is pushed to slide by oil inlet of the large cavity oil inlet 18, oil is discharged through the small cavity throttle valve 3, oil return resistance is increased, oil discharge cavity pressure is increased, high-pressure oil flows out of the small cavity oil port through a gap formed by the conical surface of the small cavity throttle valve 3 and the conical surface of the cylinder cover 2, and the piston is braked and decelerated. At the moment, the gap between the hole of the small cavity throttle valve 3 and the cylinder cover 2 can be adjusted, the throttle flow area can be changed, and the oil return flow can be changed, so that the speed of the piston during buffering and decelerating can be changed.

The following operations are specifically referred to:

the buffer pin 10 is fixed on the piston rod 1 by adopting the stop ring 9, the buffer pin 10 can slightly move axially and radially, and the buffer pin 10 adopts three uniform inclined planes to change the throttling buffer area, so that the effect of uniformly buffering the braking force is achieved.

Firstly, when the small cavity oil inlet 17 is used for oil feeding, the piston block 7 moves towards the cylinder bottom end of the cylinder barrel 11, when the buffer pin 10 floats to enter the buffer groove 19 at the cylinder bottom of the cylinder barrel 11, the buffer pin 10 plays a main throttling buffer role through three inclined planes and gaps between the outer circle and the buffer groove 19 at the cylinder bottom, the oil return resistance of the oil cylinder is increased, high pressure is formed in the large cavity, high pressure oil flows through the buffer groove 19 and throttles into the reflux groove 20 through the large cavity throttle valve 12, at the moment, the large cavity throttle valve 12 tightly abuts against the bending surface of the reflux groove 20 at the cylinder bottom through the elasticity of the spring 13 and the buffer pressure of large cavity hydraulic oil, and the buffer hydraulic oil flows out of the large cavity oil inlet 18.

The throttle aperture on the big chamber choke valve 12 plays the regulating action at this moment, and buffering high-pressure oil leads to the outflow, plays one-way throttle effect to effectual regulation buffering effect, because of high-pressure oil resistance effect, piston rod 1 movement speed slows down, has avoided striking cylinder bottom.

When the large cavity oil inlet 18 is filled with oil, the large cavity oil inlet 18 flows in high-pressure hydraulic oil, the thrust of the hydraulic oil is larger than the pressure of the spring 13, the large cavity throttle valve 12 and the cap 14 are retracted, the spring 13 is contracted to the shortest, the hydraulic oil flows into the reflux groove 20 through the gap, then enters the cylinder bottom to push the piston rod 1 to move backwards, the piston rod 1 is helped to extend out rapidly, and the starting time is shortened. The phenomenon of slow and difficult starting caused by insufficient thrust of the piston is avoided;

because the large-cavity throttle valve 12 is a replaceable part, the large-cavity throttle valve can be used for adjusting and selecting the buffering requirements of oil cylinders of different models, and the mounting hole of the large-cavity throttle valve 12 is adjusted to be between 1 and 5mm in common diameter according to the buffering effect.

When large-cavity hydraulic oil pushes the piston block 7 to move towards the cylinder cover 2 side, the buffer sleeve 6 is about to enter the buffer hole 22 of the cylinder cover 2, the buffer sleeve 6 is supported to be in a floating state by the gap between the buffer sleeve 6 and the piston rod 1, under the action of high-pressure oil, the buffer sleeve 6 can be automatically aligned to enter the buffer hole 22 of the cylinder cover 2 by means of chamfering and conicity, when the buffer sleeve 6 enters the buffer hole 22, three uniform inclined planes of the buffer sleeve 6 and gaps between the outer circle and the buffer hole 22 of the cylinder cover 2 play a main throttling buffer role, oil flows out through the three inclined planes, the flow area of the gap is reduced along with the increase of the buffer stroke, so that the buffer pressure in the buffer oil cavity is basically kept uniform and has a parabolic rule, and the high-pressure oil is unloaded by the unloading groove, so that the phenomenon that the buffer sleeve 6 and the inner cavity of the piston rod 1 stroke is trapped in the oil is avoided.

The hydraulic oil is discharged through the small cavity throttle valve 3, the oil return resistance is increased, the pressure of the oil discharge cavity is increased, and the high-pressure oil flows out of the small cavity oil port through a gap formed by the conical surface of the small cavity throttle valve 3 and the conical surface of the cylinder cover 2, so that the piston is braked and decelerated. At the moment, the gap between the hole of the small cavity throttle valve 3 and the cylinder cover 2 can be adjusted, the throttle flow area can be changed, and the oil return flow can be changed, so that the speed of the piston during buffering and decelerating can be changed.

And (3) adjusting the gap between the small cavity throttle valve 3 and the conical surface of the cylinder cover 2, loosening the lock nut 5, finely adjusting the vertical distance of the small cavity throttle valve 3, and tightening the lock nut 5 after the buffer effect is adjusted to be optimal.

Therefore, the buffer pin 10 and the buffer sleeve 6 are adopted for bidirectional adjustment buffer in the invention: the large-cavity throttle valve 12 and the small-cavity throttle valve 3 can be adjusted or replaced according to actual use conditions, and the buffering effect of the hydraulic oil cylinder is accurately controlled, so that the buffering performance of the oil cylinder is optimal.

The device also has the function of quick start: when the large cavity is filled with oil, the large cavity throttle valve 12 is pushed open, oil is introduced through the reflux groove 20, the piston block 7 is started rapidly, and the starting time is shortened.

The universality of the application is strong: through changing the size of the large-cavity throttle valve 12 and the small-cavity throttle valve 3, the universality of the buffer sleeve 6 and the buffer pin 10 is guaranteed, the processing difficulty is reduced, and the material management is convenient.

Standard parts used in the invention can be purchased from the market, special-shaped parts can be customized according to the description of the specification and the drawings, the specific connection modes of all parts adopt conventional means such as mature bolts, rivets and welding in the prior art, the machinery, the parts and the equipment adopt conventional modes in the prior art, and the circuit connection adopts conventional connection modes in the prior art, so that details are not described in detail in the specification, and the invention belongs to the prior art known to the person skilled in the art.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. It will be understood by those of ordinary skill in the art that the specific meaning of the terms described above in this application

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A two-way regulation buffering pneumatic cylinder, its characterized in that: comprising

The cylinder barrel (11), one end of the cylinder barrel (11) is provided with a cylinder cover (2), and two ends of the cylinder barrel (11) are respectively provided with a small cavity oil inlet (17) and a large cavity oil inlet (18);

the piston rod (1) is arranged in the cylinder barrel (11) in a sliding manner, and a piston block (7) is fixedly arranged at one end of the piston rod (1) through a piston nut (8);

the buffer pin (10), one end of the buffer pin (10) is connected with a stop ring (9), the stop ring (9) is arranged at the bottom end of the piston rod (1), and a buffer groove (19) is formed in the inner bottom wall of the cylinder barrel (11);

the buffer sleeve (6) is sleeved outside the piston rod (1), and a buffer hole (22) is formed in the cylinder cover (2);

wherein the buffer pin (10) can slightly move axially and radially.

2. The two-way adjustment buffer hydraulic cylinder according to claim 1, wherein: a reflux groove (20) is arranged at the position of the corresponding buffer groove (19) in the cylinder barrel (11), the reflux groove (20) is of an L-shaped structure, and a threaded hole is arranged at the bottom end of the reflux groove (20) and is communicated with the outside; screw plug (16) is installed to the screw hole internal thread, fixed mounting has big chamber choke valve (12) on screw plug (16), fixed mounting has spring (13) on big chamber choke valve (12), fixed mounting has cap (14) on spring (13), the department of buckling of the reflux slot (20) at L shape structure is contradicted to cap (14).

3. The two-way adjustment buffer hydraulic cylinder according to claim 1, wherein: an oil drain hole (21) is formed in the cylinder cover (2), the oil drain hole (21) is communicated with the buffer hole (22), a through hole is formed in the bottom end of the oil drain hole (21), a lock nut (5) is fixedly installed in the through hole, and a small-cavity throttle valve (3) is fixedly installed on the lock nut (5).

4. The two-way adjustment buffer hydraulic cylinder according to claim 1, wherein: one end of the buffer pin (10) is provided with three inclined planes.

5. The two-way adjustment buffer hydraulic cylinder according to claim 1, wherein: one end of the buffer sleeve (6) is provided with a chamfer to form a conical edge.

6. The two-way adjustment buffer hydraulic cylinder according to claim 1, wherein: and an ED sealing ring (15) is sleeved outside the screw plug (16).

7. The two-way adjustment buffer hydraulic cylinder according to claim 1, wherein: an O-shaped ring (4) is arranged between the cylinder cover (2) and the cylinder barrel (11).