CN214331052U - Buffer structure of oil cylinder - Google Patents

Abstract

The utility model discloses a buffer structure of hydro-cylinder, including the cylinder, install front cover and back lid and the movable mounting piston and the piston rod in the cylinder at cylinder both ends, the buffer column is installed along the axial to the rear end of piston rod, and the inside of back lid has with buffer column complex buffer hole, the buffer hole upper end is connected with the buffer hole, go up the rodless chamber intercommunication in the other end of buffer hole and the cylinder, go up the interior dismantlement formula of buffer hole and install first throttle case, clearance fit forms the throttle clearance between the buffer column and the gentle punching a hole, the axial orifice that has on the buffer column and communicate with the buffer hole, still be equipped with a plurality of radial orifices along radially seting up on the buffer column, radial orifice and axial orifice intercommunication, radial orifice dismantlement formula is installed second throttle case in the hole. In this way, the utility model discloses buffer structure of hydro-cylinder can adjust buffering effect and gentle punching force, simple structure, and work long service life, stability is strong.

Description

Buffer structure of oil cylinder

Technical Field

The utility model relates to a hydro-cylinder field especially relates to a buffer structure of hydro-cylinder.

Background

When the excavator oil cylinder is designed and buffered, the comfort of a manipulator when operating the excavator is further ensured on the premise of considering the structural stability and the safety of the buffer, the cost of buffering spare parts is reduced, and the working efficiency during debugging and buffering is improved. The existing rear buffer structure of the large-digging oil cylinder has several defects:

1. when the existing buffer column is used for buffer debugging, only a new buffer column can be replaced when the size of the throttling hole needs to be adjusted, and the cost is too high.

2. The buffer column needs to be frequently replaced when the buffer pressure and the effect at different positions in the buffer stroke are adjusted, and the piston is difficult to detach for replacing the buffer column under the condition of no professional torque machine. The workload of repeatedly replacing the buffer column is huge, and the working efficiency is influenced.

3. The existing buffer column has no gradual change of the oil passing area at the initial stage of the buffer stroke, namely the buffer gap is a fixed value, and the operation feeling of the buffer column when the buffer column just enters the buffer is influenced.

Disclosure of Invention

The utility model discloses the main technical problem who solves provides a buffer structure of hydro-cylinder, can adjust buffering effect and gentle punching force, simple structure, work long service life, stability is strong.

In order to solve the technical problem, the utility model discloses a technical scheme be: provides a buffer structure of an oil cylinder, which comprises a cylinder barrel, a front cover and a rear cover which are arranged at two ends of the cylinder barrel, and a piston rod which are movably arranged in the cylinder barrel, the rear end of the piston rod is axially provided with a buffer column, the inside of the rear cover is provided with a buffer hole matched with the buffer column, the lower end of the buffer hole is communicated with the oil port of the big cavity on the rear cover, the upper end of the buffer hole is connected with an upper buffer hole, the other end of the upper buffer hole is communicated with a rodless cavity in the cylinder barrel, a first throttling valve core is detachably arranged in the upper buffer hole, the buffer column and the buffer hole are in clearance fit to form a throttling clearance, the buffer column is provided with an axial throttling hole communicated with the buffer hole, the buffer column is also provided with a plurality of radial throttling holes which are arranged along the radial direction, the radial throttling holes are communicated with the axial throttling holes, and second throttling valve cores are detachably arranged in the radial throttling holes.

In a preferred embodiment of the present invention, the lower end of the upper buffer hole communicates with the buffer hole, the left end communicates with the rodless chamber of the cylinder, the upper end communicates with the outside, and the upper end of the upper buffer hole is provided with a plug.

In a preferred embodiment of the present invention, the first throttle valve core is movably installed at a middle portion of the upper buffering hole.

In a preferred embodiment of the present invention, the first throttle valve core is connected to the plug by a spring.

In a preferred embodiment of the present invention, the second throttle valve body is mounted at a mouth of the radial throttle hole.

In a preferred embodiment of the present invention, the front end of the buffer post is symmetrically provided with flat wires.

In a preferred embodiment of the present invention, the rear end of the piston rod has a mounting hole, the inner wall of the mounting hole and the rear end of the cushion post have corresponding positioning grooves, and positioning members are disposed in the positioning grooves to fixedly mount the cushion post in the mounting hole.

In a preferred embodiment of the present invention, the front cover is provided with a small chamber oil port communicated with the rod chamber of the cylinder, and the rear cover is provided with a large chamber oil port communicated with the rodless chamber of the cylinder.

The utility model has the advantages that: the utility model discloses buffer structure of hydro-cylinder can adjust buffering effect and gentle pressure, simple structure, and work long service life, stability is strong.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:

fig. 1 is a schematic structural view of a preferred embodiment of a buffer structure of an oil cylinder of the present invention;

FIG. 2 is a schematic view of a portion of the structure of FIG. 1;

FIG. 3 is a schematic view of the structure of a buffer column;

FIG. 4 is an external structural view of FIG. 3;

the parts in the drawings are numbered as follows: 1. the hydraulic damper comprises a cylinder barrel, 11, a rodless cavity, 12, a rod cavity, 13, a large cavity oil port, 2, a front cover, 3, a rear cover, 31 buffer holes, 32, an upper buffer hole, 33, a first throttling valve core, 34, a plug, 35, a spring, 4, a piston, 5, a piston rod, 51, a mounting hole, 6, a buffer column, 61, an axial throttling hole, 62, a radial throttling hole, 63, a second throttling valve core, 64, a flat wire, 65 and a positioning groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1 to 4, a cushion structure of an oil cylinder includes a cylinder barrel 1, install the protecgulum 2 and the back lid 3 and the movable mounting piston 4 and the piston rod 5 in cylinder 1 at the both ends of cylinder 1, buffer column 6 is installed along the axial to the rear end of piston rod 5, the inside of back lid 3 has the buffer hole 31 with buffer column 6 complex, buffer hole 32 is connected with to the buffer hole 31 upper end, the other end of going up buffer hole 32 communicates with no pole chamber 11 in the cylinder 1, go up buffer hole 32 and in the dismantlement formula install first throttle valve core 33, clearance fit forms the throttle clearance between buffer column 6 and the buffer hole 31, the last axial orifice 61 that communicates with buffer hole 31 that has of buffer column 6, still be equipped with a plurality of radial orifice 62 of radially seting up on the buffer column 6, radial orifice 62 communicates with axial orifice 61, radial orifice 62 in the dismantlement formula install second throttle valve core 63. If buffer pressure and buffering effect need be adjusted, can be through dismantling end cap 34, take out end cap 34 and change first throttle valve core 33 after, the accessible is dismantled the protecgulum and is extracted the piston rod, changes second throttle valve core 62 to adjust buffer pressure and effect.

In addition, the lower end of the upper buffer hole 32 is communicated with the buffer hole 31, the left end is communicated with the rodless chamber 11 of the cylinder 1, the upper end is communicated with the outside, and the upper end of the upper buffer hole 32 is provided with a plug 34. A first throttle valve spool 33 is movably mounted in the middle of the upper relief bore 32. The first throttle valve 33 is connected to the plug 34 by a spring 35. The stopper 34 closes the upper end of the upper buffer hole 32.

Further, a second throttle valve body 63 is attached to the mouth of the radial throttle hole 62. The flat wires 64 with symmetrical positions and the same angle are milled outside the front end of the buffer column 6, and the flat wires 64 are used for adjusting the throttling gap, so that the impact feeling of the buffer column can be optimized. The rear end of the piston rod 5 is provided with a mounting hole 51, the inner wall of the mounting hole 51 and the rear end of the cushion column 6 are provided with corresponding positioning grooves 65, and positioning pieces are arranged in the positioning grooves 65 to fixedly mount the cushion column 6 in the mounting hole 51. The buffer column 6 is directly fixed on the piston rod 5, and the buffer effect and the buffer pressure can be adjusted by replacing the second throttle valve core 63 without disassembling the piston 4.

In addition, a small cavity oil port (not shown in the figure) communicated with the rod cavity 12 of the cylinder barrel 1 is arranged on the front cover 2, and a large cavity oil port 13 communicated with the rodless cavity of the cylinder barrel 1 is arranged on the rear cover 3.

The utility model discloses a concrete theory of operation of buffer structure of hydro-cylinder as follows: the oil is fed from the small cavity oil port, the oil pushes the piston rod 5 to move rightwards, the piston rod 5 continuously moves rightwards until the buffer column 6 enters the buffer hole 31, because the rodless cavity 11 is ultrahigh pressure in the buffering process, the large cavity oil port 13 is low pressure, a first part of high-pressure oil in the rodless cavity 11 enters the buffering hole through the annular throttling gap between the buffering column 6 and the buffering hole 31 and then flows out of the large cavity oil port, a second part of oil passes through the second throttling valve core 63 and the radial throttling hole 62 and then flows to the large cavity oil port 13 from the buffering hole 31 through the axial throttling hole 61, and a third part of oil enters from the left end of the upper buffering hole, then flows from the lower end of the upper buffer hole to the rear big cavity oil port of the buffer hole to flow out through the first throttle valve core, at the moment, the pressure of the rodless cavity 11 is increased, thereby hindering the piston rod 5 from moving to the right, and at the same time, the piston moving speed begins to slow down, and the buffering effect of the piston is realized through three different flow directions (the flow directions are shown in fig. 2) of the oil liquid.

Be different from prior art, the utility model discloses buffer structure of hydro-cylinder can adjust buffering effect and gentle punching force, simple structure, and work long service life, stability is strong.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all of which utilize the equivalent structure or equivalent flow transformation made by the content of the specification of the present invention, or directly or indirectly applied to other related technical fields, all included in the same way in the patent protection scope of the present invention.

Claims (8)

1. A buffer structure of an oil cylinder comprises a cylinder barrel, a front cover and a rear cover which are arranged at two ends of the cylinder barrel, and a piston rod which are movably arranged in the cylinder barrel, the rear end of the piston rod is axially provided with a buffer column, the inside of the rear cover is provided with a buffer hole matched with the buffer column, the lower end of the buffer hole is communicated with a large cavity oil port on the rear cover, it is characterized in that the upper end of the buffer hole is connected with an upper buffer hole, the other end of the upper buffer hole is communicated with a rodless cavity in the cylinder barrel, a first throttle valve core is detachably arranged in the upper buffer hole, a throttle gap is formed by clearance fit between the buffer column and the buffer hole, the buffer column is provided with an axial throttle hole communicated with the buffer hole, the buffer column is also provided with a plurality of radial throttle holes which are arranged along the radial direction, the radial throttling hole is communicated with the axial throttling hole, and a second throttling valve core is detachably mounted in the radial throttling hole.

2. The cushion structure of the oil cylinder according to claim 1, wherein the lower end of the upper cushion hole is communicated with the cushion hole, the left end is communicated with the rodless chamber of the oil cylinder, the upper end is communicated with the outside, and a plug is installed at the upper end of the upper cushion hole.

3. The cushion structure of the oil cylinder according to claim 2, wherein the first throttle valve core is movably installed at the middle part of the upper cushion hole.

4. The buffer structure of the oil cylinder according to claim 3, wherein the first throttle valve core is connected with the plug through a spring.

5. The cushion structure of the oil cylinder according to claim 1, wherein the second throttle valve body is mounted at a mouth portion of a radial throttle hole.

6. The buffer structure of the oil cylinder as claimed in claim 5, wherein the front end of the buffer column is symmetrically provided with flat wires at the outer part.

7. The buffering structure of the oil cylinder as claimed in claim 6, wherein the rear end of the piston rod has a mounting hole, the inner wall of the mounting hole and the rear end of the buffering column have corresponding positioning grooves, and positioning members are disposed in the positioning grooves to fixedly mount the buffering column in the mounting hole.

8. The cushion structure of the oil cylinder according to any one of claims 1 to 7, wherein a small cavity oil port communicated with the rod cavity of the cylinder barrel is provided on the front cover.

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