CN215634634U - Buffer oil cylinder and operation machine - Google Patents
Buffer oil cylinder and operation machine Download PDFInfo
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- CN215634634U CN215634634U CN202120518792.7U CN202120518792U CN215634634U CN 215634634 U CN215634634 U CN 215634634U CN 202120518792 U CN202120518792 U CN 202120518792U CN 215634634 U CN215634634 U CN 215634634U
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Abstract
The utility model provides a buffer oil cylinder and an operation machine, wherein the buffer oil cylinder comprises a piston assembly, a buffer sleeve and an axial positioning structure; the piston assembly comprises a piston and a piston rod, the piston rod comprises a first rod body section and a second rod body section, the first rod body section is connected with the second rod body section, and the piston is arranged on the first rod body section; the buffer sleeve is movably sleeved on the second rod body section, and one end of the buffer sleeve, facing the first rod body section, can be abutted against the piston; the axial positioning structure comprises a first structure and a second structure, the first structure is arranged on the inner side surface of the buffer sleeve, the second structure is arranged on the side surface of the second rod body section, and the first structure is matched with the second structure to stop the buffer sleeve from moving towards one side departing from the first rod body section. The utility model ensures that the buffer sleeve is reliably limited on the piston rod, overcomes the problem that the effective sectional area of the step surface between the second rod body section and the third rod body section on the existing piston rod is reduced and the buffer sleeve cannot be effectively limited, and ensures the operation reliability of the buffer oil cylinder.
Description
Technical Field
The utility model relates to the technical field of hydraulic oil cylinders, in particular to a buffer oil cylinder and an operation machine.
Background
Hydraulic cylinders are widely used in work machines. In the working process of the hydraulic oil cylinder, a piston and a piston rod of the hydraulic oil cylinder can reciprocate relative to a cylinder body of the hydraulic oil cylinder, the piston can generate large impact on two ends of the cylinder body and cause impact vibration and noise, and the hydraulic oil cylinder can be damaged due to long-term continuous reciprocating impact. Thus, a damping sleeve is typically provided in the hydraulic ram to effect a damping restriction.
In the practical application, the mechanical design strength requirement of the piston rod and the requirement of effective limiting on the buffer sleeve cannot be well considered, so that the buffer sleeve is easy to fall off from the piston rod, the hydraulic oil cylinder has internal faults, and the piston rod of the hydraulic oil cylinder cannot obtain the buffer effect during ejection operation.
SUMMERY OF THE UTILITY MODEL
The utility model provides a buffer oil cylinder and an operating machine, which are used for solving the problem that a buffer sleeve in the existing hydraulic oil cylinder cannot be effectively limited on a piston rod.
The utility model provides a buffer oil cylinder, comprising: the piston assembly, the buffer sleeve and the axial positioning structure; the piston assembly comprises a piston and a piston rod, the piston rod comprises a first rod body section and a second rod body section, the first rod body section is connected with the second rod body section, and the piston is mounted on the first rod body section; the buffer sleeve is movably sleeved on the second rod body section, and one end, facing the first rod body section, of the buffer sleeve can be abutted against the piston; the axial positioning structure comprises a first structure and a second structure, the first structure is arranged on the inner side surface of the buffer sleeve, the second structure is arranged on the side surface of the second rod body section, and the first structure and the second structure are matched to stop the buffer sleeve from moving towards one side departing from the first rod body section.
According to the buffering oil cylinder provided by the utility model, the first structure comprises a first step structure, and the step surface of the first step structure faces to the side away from the first rod body section; the second structure comprises a second stepped structure, the step face of the second stepped structure facing the first rod section; the step surface of the first step structure is abutted against the step surface of the second step structure.
According to the buffer oil cylinder provided by the utility model, the piston rod comprises a third rod body section; one end of the second rod body section, which is far away from the first rod body section, is connected with one end of the third rod body section; a third step structure is formed between the second rod body section and the third rod body section; the diameter of the first rod section, the diameter of the second rod section, and the diameter of the third rod section increase in sequence; the buffer sleeve is limited between the piston and the step surface of the third step structure.
According to the buffer oil cylinder provided by the utility model, the outer side surface of the buffer sleeve is provided with an oil passing surface, the oil passing surface extends along the axial direction of the piston rod, the first end of the oil passing surface is formed in the middle of the buffer sleeve, and the second end of the oil passing surface is formed at one end of the buffer sleeve, which is far away from the first rod body section; the radius of the first end relative to the central axis of the buffer sleeve is larger than that of the second end relative to the central axis of the buffer sleeve.
According to the buffer oil cylinder provided by the utility model, the oil passing surface comprises an arc-shaped surface, a plane and a combined surface formed by the arc-shaped surface and the plane; under the condition that the oil passing surface is a plane, an included angle alpha formed by the oil passing surface and the central axis of the buffer sleeve is an acute angle.
According to the buffering oil cylinder provided by the utility model, the oil passing surfaces comprise a plurality of oil passing surfaces which are uniformly distributed in a circumferential manner relative to the central axis of the buffering sleeve.
According to the buffer oil cylinder provided by the utility model, the side surface of the second rod body section is also provided with a groove, and the notch of the groove faces to the inner side surface of the buffer sleeve.
According to the buffer oil cylinder provided by the utility model, the grooves are annular, and the grooves are sequentially and coaxially arranged along the axial direction of the piston rod.
According to the utility model, the buffer oil cylinder further comprises: the cylinder body, the cylinder bottom cover and the guide sleeve; the cylinder bottom cover is arranged at one end of the cylinder body, and the guide sleeve is arranged at the other end of the cylinder body; a first oil return channel communicated with the inner cavity of the cylinder body is formed in the cylinder bottom cover, and a second oil return channel communicated with the inner cavity of the cylinder body is formed in the guide sleeve; the piston is slidably arranged in the cylinder body, and one end of the piston rod, which is far away from the piston, penetrates through the guide hole of the guide sleeve; when the piston moves to a position close to the guide sleeve, the buffer sleeve extends into the guide hole of the guide sleeve, and a buffer gap is formed between the outer side surface of the buffer sleeve and the hole wall of the guide hole.
The utility model also provides a working machine which comprises the buffer oil cylinder.
According to the buffer cylinder and the operation machine provided by the utility model, when the buffer sleeve is sleeved on the second rod body section, the piston forms a stop for one end of the buffer sleeve facing the first rod body section, and the axial positioning structure also limits the buffer sleeve to move towards one side away from the first rod body section, so that the buffer sleeve is reliably limited on the piston rod, the problem that the effective sectional area of a step surface between the second rod body section and the third rod body section on the existing piston rod is reduced and the buffer sleeve cannot be effectively limited is effectively solved, and the operation reliability of the buffer cylinder is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a cushion cylinder provided by the present invention when a piston moves to a position close to a cylinder bottom cover;
FIG. 2 is a schematic structural diagram of a cushion cylinder provided by the present invention when a piston moves to a position close to a guide sleeve;
FIG. 3 is a schematic diagram of the present invention showing a partial enlarged structure at K in FIG. 2;
FIG. 4 is a schematic view of the installation structure of the buffer sleeve provided by the present invention on the piston rod;
FIG. 5 is a schematic structural view of a cushion collar provided in the present invention;
FIG. 6 is a schematic cross-sectional view of a cushion collar provided in accordance with the present invention;
reference numerals:
1: a cylinder body; 2: a guide sleeve; 3: a cylinder bottom cover;
4: a piston; 5: a piston rod; 6: a buffer sleeve;
7: a first oil return passage; 8: a second oil return passage; 9: a rod cavity;
10: a rodless cavity; 61: a first step structure; 62: oil surface treatment;
51: a first rod segment; 52: a second rod segment; 53: a third rod segment;
54: a second step structure; 55: a third step structure; 56: a groove;
11: a buffer gap; 12: and an axial positioning structure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A cushion cylinder and a work machine according to the present invention will be described with reference to fig. 1 to 6.
As shown in fig. 1 to 4, the present embodiment provides a cushion cylinder, including: the piston assembly, the buffer sleeve 6 and the axial positioning structure 12; the piston assembly comprises a piston 4 and a piston rod 5, the piston rod 5 comprises a first rod body segment 51 and a second rod body segment 52, the first rod body segment 51 is connected with the second rod body segment 52, and the piston 4 is mounted on the first rod body segment 51 and is in threaded connection with the first rod body segment 51; the buffer sleeve 6 is movably sleeved on the second rod body section 52, and one end of the buffer sleeve 6 facing the first rod body section 51 can be abutted with the piston 4; the axial positioning structure 12 comprises a first structure and a second structure, wherein the first structure is configured on the inner side surface of the buffer sleeve 6, the second structure is configured on the side surface of the second rod body section 52, and the first structure and the second structure are matched to stop the buffer sleeve 6 from moving towards the side away from the first rod body section 51.
Specifically, when the cushion sleeve 6 is sleeved on the second rod body segment 52, since the piston 4 forms a stop for one end of the cushion sleeve 6 facing the first rod body segment 51, the axial positioning structure 12 limits the cushion sleeve 6 to move towards the side away from the first rod body segment 51, so that the cushion sleeve 6 is reliably limited on the piston rod 5, the problem that the effective sectional area of the step surface between the second rod body segment 52 and the third rod body segment 53 on the existing piston rod 5 is reduced and the cushion sleeve 6 cannot be effectively limited is effectively solved, and the operation reliability of the cushion cylinder is ensured.
It should be noted that the axial positioning structure 12 shown in the present embodiment may be a positioning structure formed by a protrusion and a groove respectively disposed on the buffer sleeve 6 and the second rod segment 52, or a positioning structure formed by a male end and a female end respectively disposed on the buffer sleeve 6 and the second rod segment 52, which is not specifically limited herein, as long as the buffer sleeve 6 is limited to move toward the side away from the first rod segment 51. And under the condition that the first structure is a protrusion, the second structure is a groove matched with the protrusion. Accordingly, where the first structure is a male tang, the second structure is a female tang that mates with the male tang.
As shown in fig. 1, 2 and 4, in a preferred embodiment, the first structure shown in this embodiment includes a first step structure 61, and a step surface of the first step structure 61 faces a side away from the first rod body segment 51. The second structure comprises a second step structure 54, the step of the second step structure 54 facing the first rod segment 51. Therefore, when the step surface of the first step structure 61 abuts against the step surface of the second step structure 54, the cushion collar 6 does not move on the second rod body segment 52 toward the side away from the first rod body segment 51 due to the mutual engagement between the first step structure 61 and the second step structure 54.
As shown in fig. 1, 2 and 4, the piston rod 5 of the present embodiment further includes a third rod segment 53. The end of the second rod segment 52 remote from the first rod segment 51 is connected to one end of a third rod segment 53; a third step structure 55 is formed between the second rod segment 52 and the third rod segment 53; the diameter of the first rod segment 51, the diameter of the second rod segment 52 and the diameter of the third rod segment 53 increase in order; the cushion collar 6 is limited between the piston 4 and the step surface of the third step structure 55.
Since the axial positioning structure 12 shown in the above-described embodiment is capable of effectively restricting the movement of the damping sleeve 6 toward the side away from the first rod segment 51, the present embodiment does not have an excessive requirement for the difference in diameter between the second rod segment 52 and the third rod segment 53. In the case that practical conditions allow, the present embodiment may still provide the third step structure 55 between the second rod segment 52 and the third rod segment 53 to limit the two ends of the buffer sleeve 6 based on the step surfaces of the piston 4 and the third step structure 55, so as to further prevent the buffer sleeve 6 from being detached from the second rod segment 52.
As shown in fig. 1 and 2, the cushion cylinder of the present embodiment includes: the cylinder body 1, the cylinder bottom cover 3 and the guide sleeve 2; the cylinder bottom cover 3 is arranged at one end of the cylinder body 1, and the guide sleeve 2 is arranged at the other end of the cylinder body 1; a first oil return channel 7 communicated with the inner cavity of the cylinder body 1 is formed on the cylinder bottom cover 3, and a second oil return channel 8 communicated with the inner cavity of the cylinder body 1 is formed on the guide sleeve 2; the piston 4 is slidably installed in the cylinder 1 to divide the inner cavity of the cylinder 1 into a rod chamber 9 and a rod-less chamber 10, and one end of the piston rod 5 remote from the piston 4 passes through the guide hole of the guide sleeve 2, i.e., the third rod body section 53 on the piston rod 5 passes through the guide hole of the guide sleeve 2.
As shown in fig. 1, when the piston 4 moves toward the cylinder bottom cover 3, the piston 4 compresses the space in which the rodless chamber 10 is located, so that the hydraulic oil in the rodless chamber 10 is returned along the first oil return passage 7.
As shown in fig. 2 to 3, when the piston 4 moves toward the guide sleeve 2, the piston 4 compresses the space in which the rod chamber 9 is located, so that the hydraulic oil in the rod chamber 9 is returned along the second oil return passage 8. When the piston 4 moves to a position close to the guide sleeve 2, the buffer sleeve 6 extends into the guide hole of the guide sleeve 2, and a buffer gap 11 is arranged between the outer side surface of the buffer sleeve 6 and the hole wall of the guide hole. Based on the throttling action of the buffer gap 11, the flow rate of the hydraulic oil flowing back from the rod chamber 9 is gradually reduced, the return resistance of the hydraulic oil is increased, the oil pressure of the hydraulic oil in the rod chamber 9 is increased, so that the moving speed of the piston 4 is reduced, and the buffer action is generated.
As shown in fig. 5 to 6, the outer side surface of the damping sleeve 6 shown in the present embodiment is configured with an oil passing surface 62, the oil passing surface 62 extends along the axial direction of the piston rod 5, a first end of the oil passing surface 62 is formed at the middle of the damping sleeve 6, and a second end is formed at an end of the damping sleeve 6 facing away from the first rod body section 51; the radius of the first end relative to the center axis of the damping sleeve 6 is greater than the radius of the second end relative to the center axis of the damping sleeve 6.
Specifically, this embodiment is based on the design of crossing oil level 62, can make buffer sleeve 6 in the in-process that stretches into in the guide hole to uide bushing 2, hydraulic oil in having the pole chamber 9 earlier through buffering clearance 11 and cross oil level 62 and flow into second oil return passage 8 to carry out the oil return, and when buffer sleeve 6 stretches into the guide hole of uide bushing 2 completely, hydraulic oil in having the pole chamber 9 can only flow into second oil return passage 8 through buffering clearance 11, in order to carry out the oil return, thereby guaranteed the throttle effect, strengthened the cushioning effect to the piston.
It should be noted that the oil passing surface 62 shown in the present embodiment includes an arc surface, a flat surface, and a combination surface of the arc surface and the flat surface. Wherein, arcwall face and plane all extend to the second end from first end on the lateral wall of cushion collar 6, and the combined surface both can be formed by connecting gradually a plurality of arcwall faces, also can be formed by connecting gradually a plurality of planes, can also be formed by connecting gradually a plurality of arcwall faces and a plurality of planes, and the combined surface also extends to the second end from first end on the lateral wall of cushion collar 6. The structural form of the oil level 62 is not particularly limited, so long as oil return of the hydraulic oil in the rod chamber 9 can be performed through the oil level 62.
As shown in fig. 6, when the oil level 62 is a plane, an included angle α formed by the oil level 62 and the central axis of the cushion sleeve 6 is an acute angle, where the size of α may be 3 °, 5 °, 10 °, and the like, and is not limited in detail.
Meanwhile, the oil passing surface 62 shown in the present embodiment includes a plurality of surfaces, and is circumferentially and uniformly distributed with respect to the central axis of the cushion collar 6. Specifically, three oil level surfaces 62 may be provided in the present embodiment.
Further, as shown in fig. 1, in order to ensure that the damping sleeve 6 is automatically centered under the pressure of the hydraulic oil, i.e. to ensure that the damping sleeve 6 and the piston rod 5 are coaxial, and to avoid the eccentricity caused by the fixed connection of the damping sleeve 6 to the piston rod 5, the side surface of the second rod body section 52 shown in this embodiment is further configured with a groove 56, and the notch of the groove 56 faces the inner side surface of the damping sleeve 6.
In order to ensure the coaxial effect between the cushion sleeve 6 and the piston rod 5, the grooves 56 shown in this embodiment are annular, and a plurality of grooves 56 are sequentially and coaxially arranged along the axial direction of the piston rod 5.
Preferably, the embodiment further provides a working machine, which comprises the buffer oil cylinder. The working machine shown in this embodiment specifically includes a crane, a concrete pump truck, a fire truck, an aerial boom truck, and the like, and is not specifically limited herein.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A cushion cylinder, its characterized in that includes:
the piston assembly comprises a piston and a piston rod, the piston rod comprises a first rod body section and a second rod body section, the first rod body section is connected with the second rod body section, and the piston is installed on the first rod body section;
the buffer sleeve is movably sleeved on the second rod body section, and one end, facing the first rod body section, of the buffer sleeve can be abutted against the piston;
the axial positioning structure comprises a first structure and a second structure, the first structure is arranged on the inner side surface of the buffer sleeve, the second structure is arranged on the side surface of the second rod body section, and the first structure and the second structure are matched to stop the buffer sleeve from moving towards one side departing from the first rod body section.
2. The cushion cylinder as claimed in claim 1, wherein the first structure comprises a first step structure having a step face facing a side facing away from the first rod section; the second structure comprises a second stepped structure, the step face of the second stepped structure facing the first rod section; the step surface of the first step structure is abutted against the step surface of the second step structure.
3. The cushion cylinder of claim 1, wherein the piston rod includes a third rod segment; one end of the second rod body section, which is far away from the first rod body section, is connected with one end of the third rod body section; a third step structure is formed between the second rod body section and the third rod body section; the diameter of the first rod section, the diameter of the second rod section, and the diameter of the third rod section increase in sequence; the buffer sleeve is limited between the piston and the step surface of the third step structure.
4. The cushion cylinder according to claim 1, wherein an outer side surface of the cushion sleeve is configured with an oil passing surface extending in an axial direction of the piston rod, a first end of the oil passing surface being formed at a middle portion of the cushion sleeve, and a second end being formed at an end of the cushion sleeve facing away from the first rod body section; the radius of the first end relative to the central axis of the buffer sleeve is larger than that of the second end relative to the central axis of the buffer sleeve.
5. The cushion cylinder of claim 4, wherein the oil passing surface comprises an arc surface, a plane and a combined surface formed by the arc surface and the plane; under the condition that the oil passing surface is a plane, an included angle alpha formed by the oil passing surface and the central axis of the buffer sleeve is an acute angle.
6. The cushion cylinder of claim 4, wherein the oil passing surface comprises a plurality of oil passing surfaces which are circumferentially and uniformly distributed relative to a central axis of the cushion sleeve.
7. The cushion cylinder as claimed in claim 1, wherein the side of the second rod body segment is further configured with a groove, the notch of the groove facing the inner side of the cushion collar.
8. The cushion cylinder according to claim 7, wherein the grooves are circular, and the grooves are sequentially and coaxially arranged along the axial direction of the piston rod.
9. The cushion cylinder of any one of claims 1 to 8, further comprising: the cylinder body, the cylinder bottom cover and the guide sleeve;
the cylinder bottom cover is arranged at one end of the cylinder body, and the guide sleeve is arranged at the other end of the cylinder body; a first oil return channel communicated with the inner cavity of the cylinder body is formed in the cylinder bottom cover, and a second oil return channel communicated with the inner cavity of the cylinder body is formed in the guide sleeve;
the piston is slidably arranged in the cylinder body, and one end of the piston rod, which is far away from the piston, penetrates through the guide hole of the guide sleeve;
when the piston moves to a position close to the guide sleeve, the buffer sleeve extends into the guide hole of the guide sleeve, and a buffer gap is formed between the outer side surface of the buffer sleeve and the hole wall of the guide hole.
10. A work machine comprising a cushion cylinder according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120518792.7U CN215634634U (en) | 2021-03-11 | 2021-03-11 | Buffer oil cylinder and operation machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120518792.7U CN215634634U (en) | 2021-03-11 | 2021-03-11 | Buffer oil cylinder and operation machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215634634U true CN215634634U (en) | 2022-01-25 |
Family
ID=79913294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120518792.7U Active CN215634634U (en) | 2021-03-11 | 2021-03-11 | Buffer oil cylinder and operation machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215634634U (en) |
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2021
- 2021-03-11 CN CN202120518792.7U patent/CN215634634U/en active Active
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