CN213684772U - Oil cylinder with built-in buffer device - Google Patents
Oil cylinder with built-in buffer device Download PDFInfo
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- CN213684772U CN213684772U CN202022357181.7U CN202022357181U CN213684772U CN 213684772 U CN213684772 U CN 213684772U CN 202022357181 U CN202022357181 U CN 202022357181U CN 213684772 U CN213684772 U CN 213684772U
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- 238000007789 sealing Methods 0.000 claims abstract description 78
- 239000012530 fluid Substances 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 29
- 230000003139 buffering effect Effects 0.000 description 14
- 238000000034 method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 5
- 238000007667 floating Methods 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009193 crawling Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The utility model discloses a built-in buffer's hydro-cylinder. The piston rod comprises a cylinder bottom, a cylinder barrel and an end cover which are connected in sequence, wherein a piston which is matched with the cylinder barrel to slide is fixedly arranged at the rear end of the piston rod, and the front end of the piston rod can extend out of the end cover when the piston rod moves; the piston divides the cylinder barrel into a rod cavity and a rodless cavity; a rod cavity oil port is formed in one side, located in a rod cavity, of the cylinder barrel, a rodless cavity oil port is formed in one side, located in a rodless cavity, of the cylinder barrel, at least one axial through hole is formed in the piston, and a buffer rod is arranged in each axial through hole. The buffer rod comprises a middle working section, a left sealing section and a right sealing section at two ends of the working section, the working section can slide along the axial through hole, and the right sealing section and the left sealing section are respectively sealed with a right port and a left port of the axial through hole when the buffer rod moves leftwards or rightwards to the tail end of a stroke; at least one throttling opening is arranged on the working section, and a throttling hole is formed between the throttling opening and the axial through hole. The utility model discloses only increase a spare part of buffer beam, simplified the buffer structure of hydro-cylinder, it is with low costs.
Description
Technical Field
The utility model belongs to the technical field of the hydraulic cylinder technique and specifically relates to a hydraulic cylinder with buffer function.
Background
The oil cylinder is an actuating element of a hydraulic system and comprises a cylinder barrel, a piston and a piston rod, wherein the piston moves at a high speed in the oil cylinder under the driving of hydraulic pressure. The rear end of the cylinder barrel is provided with a cylinder bottom, when a piston rod reaches the rear end of the oil cylinder in the process of rapid movement of the hydraulic oil cylinder, strong impact, noise and even mechanical collision can be generated at a stroke terminal, and particularly under the condition of high pressure, the influence is more obvious, and the service life of the oil cylinder is seriously influenced.
In order to reduce the impact of the piston on the cylinder bottom, especially when the working pressure of the oil cylinder is greater than 25MPa and the moving parts have large mass, in order to prevent the piston from mechanically colliding with the cylinder bottom at the end of the stroke to cause noise and impact, even damage to the parts of the oil cylinder, a buffer structure needs to be arranged on the cylinder bottom of the oil cylinder, and proper braking and buffering are performed before the movement is finished to relieve the impact of the piston on the cylinder bottom and ensure the service life of the system and the oil cylinder.
There are basically two methods of buffering at present: one is external control of the hydraulic cylinder, a throttle valve or other flow control devices are arranged on a loop for controlling the hydraulic cylinder for buffering, and the general structure is more complicated; the other is internal control of the hydraulic cylinder, a buffer device is designed in the hydraulic cylinder to realize buffer, for example, the Chinese patent application 'hydraulic cylinder with improved buffer effect' (application publication No. CN101936318A, application publication date: 2011 1 month and 5 days), the structure of the hydraulic cylinder is characterized in that a cylindrical buffer sleeve is sleeved on a piston rod, the length of the cylindrical buffer sleeve is less than that of the corresponding installation section of the piston rod, the inner wall of the buffer sleeve is in clearance fit with the outer wall of the installation section of the buffer sleeve, a buffer hole is arranged on a cylinder cover of the hydraulic cylinder, a rod cavity of the hydraulic cylinder is communicated with an oil return port through the buffer hole, the outer wall of the cylindrical buffer sleeve is in clearance fit with the inner wall of the buffer hole, when the piston rod approaches to a terminal, the cylindrical buffer sleeve slides into the buffer hole to gradually block the oil return port, the internal buffer device has simple structure and small volume, and does not, therefore, the buffering mode is an ideal buffering mode, but the floating buffering principle is the process of firstly utilizing end face sealing constant throttling and then returning oil through a floating gap of the buffering sleeve, the buffering effect is good at the beginning in the whole buffering process, the effect is poor when the buffering is finished, and the following defects exist: 1. the length of the buffer sleeve is smaller than the length of the buffer sleeve mounting section, the buffer sleeve can incline in the movement process, and the buffer sleeve is easy to block when entering a buffer hole of a cylinder cover; 2. the starting process has the phenomena of shaking and crawling; 3. a great pressure impact exists in the buffering process; 4. the structure is relatively complex, the manufacturing cost is high, and the maintenance is inconvenient; 5. the starting pressure at the start of starting is large.
Disclosure of Invention
The utility model aims at providing a built-in buffer's hydro-cylinder can simplify hydro-cylinder buffer structure, and the action is smooth and easy, stable, and buffering effect is good, long service life, with low costs.
The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is:
an oil cylinder with a built-in buffer device comprises a cylinder bottom, a cylinder barrel and an end cover which are connected in sequence, wherein a piston which is matched with the cylinder barrel to slide is fixedly arranged at the rear end of a piston rod, and the front end of the piston rod can extend out of the end cover when the piston rod moves; the piston divides the cylinder barrel into a rod cavity and a rodless cavity; one side that is located there is the pole chamber on the cylinder is provided with pole chamber hydraulic fluid port, and one side that is located no pole chamber on the cylinder sets up no pole chamber hydraulic fluid port, its characterized in that: the piston is provided with at least one axial through hole, and a buffer rod is arranged in the axial through hole.
In the oil cylinder with the built-in buffer device, an orifice is arranged between the buffer rod and the axial through hole.
In the oil cylinder with the built-in buffer device, the buffer rod comprises a middle working section, a left sealing section and a right sealing section at two ends of the working section, the working section can slide along the axial through hole, the left sealing section is sealed with a left port of the axial through hole when the buffer rod moves to the tail end of a stroke rightwards, and the right sealing section is sealed with a right port of the axial through hole when the buffer rod moves to the tail end of the stroke leftwards; the working section is provided with at least one throttling opening, a throttling hole is formed between the throttling opening and the axial through hole, and the length of the throttling opening is larger than that of the axial through hole.
In the oil cylinder with the built-in buffer device, the diameters of the left sealing section and the right sealing section are larger than the diameter of the working section.
Furthermore, a left round table with the same upper bottom diameter as the working section and the same lower bottom diameter as the left sealing section is arranged between the left sealing section and the working section, and the outer side surface of the left round table is sealed with the left port of the axial through hole when the buffer rod moves to the tail end of the stroke rightwards; and a right round table with the same upper bottom diameter as the working section and the same lower bottom diameter as the right sealing section is arranged between the right sealing section and the working section, and the outer side surface of the right round table is sealed with the right port of the axial through hole when the buffer rod moves leftwards to the tail end of the stroke.
In the oil cylinder with the built-in buffer device, the throttling opening is arranged in the middle of the working section along the axial direction of the buffer rod, and the throttling opening is a notch obtained by removing a part of a cylinder with a minor arc-shaped cross section on the working section of the buffer rod.
Furthermore, the number of the throttling openings is 3, and the throttling openings are uniformly arranged on the outer cylindrical surface of the working section of the buffer rod along the circumferential direction.
In the oil cylinder with the built-in buffer device, when the buffer rod moves rightwards to the tail end of the stroke, the distance between the left end of the buffer rod and the cylinder bottom is greater than the distance between the left end of the piston rod and the cylinder bottom; when the buffer rod moves to the tail end of the stroke leftwards, the distance between the right end of the buffer rod and the end cover is larger than the distance between the right end of the piston and the end cover.
Has the advantages that:
compared with the prior art, the utility model provides a pair of built-in buffer's hydro-cylinder sets up the axial through-hole on the piston, is provided with the buffer beam among the axial through-hole, is equipped with the choke on the working section of buffer beam, forms the orifice between choke and the axial through-hole, has simplified the buffer structure of hydro-cylinder, only increases spare part of buffer beam, and is with low costs.
Drawings
Fig. 1 is a schematic overall sectional view of the present invention (piston rod and piston are retracted backward to the end of stroke).
Fig. 2 is a schematic view of the piston rod and the piston extending forward and away from the cylinder bottom according to the present invention.
Fig. 3 is a schematic diagram of the middle piston rod and the piston extending forward to the position close to the end cap and the right end of the buffer rod touching the end cap.
Fig. 4 is a schematic diagram of the buffering process of the present invention in which the piston rod and the piston are extended forward to the throttle hole to connect the rod chamber and the rodless chamber.
Fig. 5 is a schematic diagram of the piston rod and the piston extending forward to the end of the stroke according to the present invention.
Fig. 6 is a schematic view of the piston rod and the piston of the present invention retracting backward and leaving the end cap.
Fig. 7 is a schematic diagram of the piston rod and the piston moving backward to the position close to the cylinder bottom when the left end of the buffer rod touches the cylinder bottom.
Fig. 8 is a schematic diagram of the buffering process of the present invention in which the piston rod and the piston move backward to the throttle hole to connect the rod chamber and the rodless chamber.
FIG. 9 is a schematic view of the bumper bar engaging an axial through bore in the piston.
FIG. 10 is a schematic view of a bumper beam.
FIG. 11 is a schematic cross-sectional view of a working section of the buffer rod.
FIG. 12 is a schematic view showing the buffer rod and the axial through hole of the piston according to the second embodiment.
FIG. 13 is a schematic view showing the buffer rod of the third embodiment engaged with the axial through hole of the piston.
In the figure: the hydraulic cylinder comprises a cylinder bottom 1, a cylinder barrel 2, a rodless cavity oil port 2-1, a rod cavity oil port 2-2, a piston 3, an axial through hole 3-1, a conical hole 3-2, a round chamfer 3-3, a counter bore 3-4, a piston rod 4, an end cover 5, a rodless cavity 6, a rod cavity 7, a lock nut 8, a buffer rod 9, a right sealing section 9-1, a right circular truncated cone 9-2, a working section 9-3, a choke 9-4, a left circular truncated cone 9-5, a left sealing section 9-6 and a nut 9-7.
Detailed Description
In order to clearly illustrate the technical features of the present invention, the present invention is further described below by way of non-limiting examples in combination with the accompanying drawings.
The front, back, left and right directions of the utility model are described according to the front, back, left and right directions shown in the attached drawings. For ease of illustration, only the portions relevant to the embodiments of the present invention are shown.
The first embodiment is as follows:
referring to fig. 1 to 11, the extending direction of the piston rod 4 is set to be the front, and the opposite direction is set to be the rear, the oil cylinder with the built-in buffer device of the present embodiment includes a cylinder bottom 1, a cylinder barrel 2 and an end cover 5 which are sequentially connected from back to front (from left to right in the figure), the cylinder barrel 2 is a tubular cylinder with an inner hole which is precisely processed, the rear end of the cylinder barrel 2 is welded on the cylinder bottom 1, the inner hole at the front end of the cylinder barrel 2 is processed with a threaded hole, the diameter of the threaded hole is larger than that of the inner hole of the cylinder barrel, the end cover 5 is connected to the threaded hole in a threaded manner, the outer side surface at the front end of the end cover 5 extends in a direction away from the axis center, and the outer convex ring of the; the outer cylindrical surface at the rear end of the end cover 5 is matched with the inner hole of the cylinder barrel and is provided with a seal; the rear end of the piston rod 4 is fixedly provided with a piston 3 which is matched with and slides in an inner hole of the cylinder barrel, specifically, the rear end of the piston rod 4 penetrates through a central hole of the piston 3, and the piston 3 is fastened at the rear end of the piston rod 4 through a locking nut 8; a sealing component is arranged between the cylinder barrel 2 and the piston 3, the front end of the piston rod 4 can extend out of the end cover 5 when moving, and the sealing component is arranged between the piston rod 4 and the end cover 5; the piston 3 divides the cylinder barrel 2 into a rod cavity 7 and a rodless cavity 6; a rod cavity oil port 2-2 is arranged on one side of the cylinder barrel 2, which is positioned with the rod cavity 7, and a rodless cavity oil port 2-1 is arranged on one side of the cylinder barrel 2, which is positioned with the rodless cavity 6.
1 axial through hole is arranged on the piston 3 and between the front end surface and the rear end surface of the piston 3, and 1 buffer rod 9 is arranged in the axial through hole; referring to fig. 9 to 11, the buffer rod 9 includes a middle working section 9-3, a left sealing section 9-6 and a right sealing section 9-1 at two ends of the working section 9-3, the diameters of the left sealing section 9-6 and the right sealing section 9-1 are larger than the diameter of the working section 9-3, the working section 9-3 is matched with the axial through hole and can slide along the axial through hole, and the matching gap is small, for example, controlled at H8/d 8; a left round table 9-5 with the same upper bottom diameter as the working section 9-3 and the same lower bottom diameter as the left sealing section 9-6 is arranged between the left sealing section 9-6 and the working section 9-3, when the buffer rod 9 moves to the tail end of the stroke rightwards, the outer side surface of the left round table 9-5 presses against a left port of the axial through hole to form sealing, specifically, the left port of the axial through hole is provided with a tapered hole 3-2 with the same taper as that of the outer side surface of the left round table 9-5, and the outer side surface of the left round table 9-5 presses against the tapered hole 3-2 to form surface sealing; and the distance between the left end of the buffer rod 9 and the cylinder bottom is greater than the distance between the left end of the piston/piston rod and the cylinder bottom; for this purpose, the rear end of the piston rod 4 passes through the central hole of the piston 3 and protrudes out of the left end surface of the piston 3, and the piston 3 is fastened to the rear end of the piston rod 4 through a lock nut 8; if the piston 3 and the piston rod 4 are connected in the following way: the left end face of the piston 3 is provided with a counter bore which is communicated with the central hole, coaxial and larger than the outer diameter of the locking nut 8 in diameter, the depth of the counter bore is larger than the thickness of the locking nut 8, the rear end of the piston rod 4 penetrates through the central hole of the piston 3, the piston 3 is fastened at the rear end of the piston rod 4 through the locking nut 8, and then the problem is solved by adopting a method that the counter bore or an annular groove communicated with the axial through hole is arranged on the left end face of the piston 3 (refer to the matching mode of the right end of the next section of the buffer rod and the right.
A right round table 9-2 with the same upper bottom diameter as the working section 9-3 and the same lower bottom diameter as the right sealing section 9-1 is arranged between the right sealing section 9-1 and the working section 9-3, when the buffer rod 9 moves leftwards to the stroke end, the outer side surface of the right round table 9-2 is pressed against the right end opening of the axial through hole to form sealing, similarly, the right end opening of the axial through hole is provided with a tapered hole 3-2 with the same taper as the outer side surface of the right round table 9-2, and the outer side surface of the right round table 9-2 is pressed against the tapered hole 3-2 to form surface sealing; the distance between the right end of the buffer rod 9 and the end cover is larger than the distance between the right end of the piston 3 and the end cover; therefore, a counter bore 3-4 which is communicated with the axial through hole and is coaxial with the axial through hole and has the diameter larger than that of the right sealing section 9-1 is required to be arranged on the right end face of the piston 3, the depth of the counter bore 3-4 is larger than the lengths of the right sealing section 9-1 and the right round platform 9-2, and the right sealing section 9-1 and the right round platform 9-2 on the right end of the buffer rod 9 are positioned in the counter bore 3-4; or an annular groove with the depth larger than the lengths of the right sealing section 9-1 and the right round platform 9-2 and the width larger than the diameter of the right sealing section 9-1 is arranged on the right end face of the piston 3, so that the right sealing section 9-1 and the right round platform 9-2 at the right end of the buffer rod 9 are positioned in the groove.
3 throttling mouths 9-4 which are uniformly arranged on the outer cylindrical surface along the circumferential direction are arranged on the working section 9-3, a throttling hole is formed between the throttling mouth 9-4 and the axial through hole, and the length L2 of the throttling mouth 9-4 is greater than the length L1 of the axial through hole and less than the length of the working section 9-3; the throttling opening 9-4 is arranged on the working section 9-3 in the center along the axial direction of the buffer rod 9, and in the embodiment, the throttling opening 9-4 is a notch obtained by removing a part of a cylinder with a minor arc-shaped cross section on the working section 9-3 of the buffer rod 9.
For convenience of assembly, in the embodiment, the buffer rod 9 is of a split structure, the left sealing section 9-6 and the left circular truncated cone 9-5 are integrated, an axial central through hole is formed in the middle, the right sealing section 9-1, the right circular truncated cone 9-2 and the working section 9-3 are integrated, a connecting part extends from the left end of the working section 9-3, the connecting part comprises a cylindrical section and a threaded connecting section which are matched with the central through hole, the left sealing section 9-6, the left circular truncated cone 9-5 and the nut 9-7 are sequentially sleeved on the connecting part, and the nut 9-7 is fastened to enable the buffer rod 9 to be integrated.
The working process is as follows:
referring to fig. 1, when an oil inlet 2-1 of the rodless cavity is filled with oil, because the pressure of the rodless cavity is greater than that of the rod cavity, the buffer rod 9 moves rightwards to the tail end of the stroke, the outer side surface of the left circular truncated cone 9-5 of the buffer rod is attached to and sealed with the left port of the axial through hole in the piston 3, and referring to fig. 2, the oil in the rodless cavity 6 pushes the piston 3 and the piston rod 4 to move forwards rapidly together; when the piston rod 4 and the piston 3 extend forwards to move to approach the stroke end, please see fig. 3, the right end of the buffer rod 9 touches the end cover 5, the piston rod 4 and the piston 3 continue to extend forwards, the buffer rod 9 moves leftwards relative to the piston 3, the orifice is communicated, see fig. 4, so that a rod cavity 7 generates a large back pressure, the piston 3 slowly decelerates, the piston 3 and the piston rod 4 can only move forwards slowly until the end surface of the piston 3 is attached to the end cover 5 (please see fig. 5), and soft landing of the extending end part of the piston is realized; at this time, the buffer rod 9 is in a floating state with respect to the axial through hole in the piston 3.
Similarly, when the piston rod 4 retracts, please see fig. 5, when the oil port 2-2 of the rod cavity is filled with oil, because the pressure of the rod cavity is greater than that of the rodless cavity, the buffer rod 9 moves leftwards to the tail end of the stroke, the outer side surface of the right round platform 9-2 of the buffer rod is attached to and sealed with the right port of the axial through hole on the piston 3, please see fig. 6, the oil in the right rod cavity 7 pushes the piston 3 and the piston rod 4 to move backwards quickly; when the piston rod 4 and the piston 3 retract and move backwards to approach the stroke end, the left end of the buffer rod 9 touches the cylinder bottom, see fig. 7, the piston rod 4 and the piston 3 continue to retract and move backwards, the buffer rod 9 moves rightwards relative to the piston 3, the throttle hole is communicated, see fig. 8, so that the rod cavity 6 generates a large back pressure, the piston 3 slowly decelerates, the piston 3 and the piston rod 4 can only move backwards slowly until the left end surface of the piston rod 4 is attached to the cylinder bottom (see fig. 1), soft landing of the retracting end of the piston is realized, and at the moment, the buffer rod 9 is in a floating state relative to an axial through hole in the piston 3.
Example two:
referring to fig. 12, 1 axial through hole is formed in the piston 3 between the front end surface and the rear end surface of the piston 3, and 1 buffer rod 9 is disposed in the axial through hole; the buffer rod 9 comprises a middle working section 9-3, a left sealing section 9-6 and a right sealing section 9-1 at two ends of the working section 9-3, the diameters of the left sealing section 9-6 and the right sealing section 9-1 are larger than that of the working section 9-3, the working section 9-3 is matched with the axial through hole and can slide along the axial through hole, and the matching clearance is small, such as H8/d 8; a left round table 9-5 with the same upper bottom diameter as the working section 9-3 and the same lower bottom diameter as the left sealing section 9-6 is arranged between the left sealing section 9-6 and the working section 9-3, when the buffer rod 9 moves rightwards to the stroke end, the outer side surface of the left round table 9-5 presses against a left port of the axial through hole to form sealing, specifically, a round chamfer 3-3 is arranged at the left port of the axial through hole, and the outer side surface of the left round table 9-5 presses against the round chamfer 3-3 to form linear sealing;
a right round table 9-2 with the same upper bottom diameter as the working section 9-3 and the same lower bottom diameter as the right sealing section 9-1 is arranged between the right sealing section 9-1 and the working section 9-3, when the buffer rod 9 moves leftwards to the stroke end, the outer side surface of the right round table 9-2 presses against the right port of the axial through hole to form sealing, similarly, the right port of the axial through hole is provided with a circular chamfer 3-3, and the outer side surface of the right round table 9-2 presses against the circular chamfer 3-3 to form linear sealing;
the sealing structure is a line sealing structure, and the sealing effect is better than that of the first embodiment.
The rest of the structure is the same as the first embodiment.
Example three:
referring to fig. 13, 1 axial through hole is formed in the piston 3 between the front end surface and the rear end surface of the piston 3, and 1 buffer rod 9 is disposed in the axial through hole; the buffer rods 9 respectively comprise a middle working section 9-3, a left sealing section 9-6 and a right sealing section 9-1 at two ends of the working section 9-3, the diameters of the left sealing section 9-6 and the right sealing section 9-1 are larger than that of the working section 9-3, the working section 9-3 is matched with the axial through hole and can slide along the axial through hole, and the matching clearance is small, such as H8/d 8; when the buffer rod 9 moves to the tail end of the stroke rightwards, the right end face of the left sealing section 9-6 presses against the left end face of the piston 3 around the left port of the axial through hole to form sealing, and when the buffer rod 9 moves to the tail end of the stroke leftwards, the left end face of the right sealing section 9-1 presses against the right end face of the piston 3 around the right port of the axial through hole to form sealing; 3 throttling mouths 9-4 which are uniformly arranged on the outer cylindrical surface along the circumferential direction are arranged on the working section 9-3, a throttling hole is formed between the throttling mouth 9-4 and the axial through hole, and the length of the throttling mouth 9-4 is greater than that of the axial through hole and less than that of the working section 9-3; the throttling opening 9-4 is arranged on the working section 9-3 in the center along the axial direction of the buffer rod 9, and in the embodiment, the throttling opening 9-4 is a notch obtained by removing a part of a cylinder with a minor arc-shaped cross section on the working section 9-3 of the buffer rod 9.
For convenience of assembly, the buffer rod 9 in this embodiment also adopts a split structure, the left sealing section 9-6 is separately integrated, an axial central through hole is arranged in the middle, the right sealing section 9-1 and the working section 9-3 are integrated, a connecting part extends from the left end of the working section 9-3, the connecting part comprises a cylindrical section and a threaded connecting section which are matched with the central through hole, the left sealing section 9-6 and the nut 9-7 are sequentially sleeved on the connecting part, and the nut 9-7 is fastened to enable the buffer rod 9 to be integrated.
The working process of the embodiment is basically the same as that of the second embodiment, except that when the buffer rod 9 moves to the right to the stroke end, the right end face of the left sealing section 9-6 presses against the left end face of the piston 3 around the left port of the axial through hole to form a seal, and when the buffer rod 9 moves to the left to the stroke end, the left end face of the right sealing section 9-1 presses against the right end face of the piston 3 around the right port of the axial through hole to form a seal.
The rest of the structure is the same as the second embodiment.
In the description of the present invention, it should be noted that the terms "left", "right", "front", "back", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and the above terms are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition to the technical features described in the specification, the technology is known to those skilled in the art.
The above-mentioned embodiments are only for understanding the present invention, and are not intended to limit the technical solutions of the present invention, and those skilled in the relevant art can make various changes or modifications based on the technical solutions described in the claims, and all equivalent changes or modifications should be covered by the scope of the claims of the present invention.
Claims (8)
1. An oil cylinder with a built-in buffer device comprises a cylinder bottom, a cylinder barrel and an end cover which are connected in sequence, wherein a piston which is matched with the cylinder barrel to slide is fixedly arranged at the rear end of a piston rod, and the front end of the piston rod can extend out of the end cover when the piston rod moves; the piston divides the cylinder barrel into a rod cavity and a rodless cavity; one side that is located there is the pole chamber on the cylinder is provided with pole chamber hydraulic fluid port, and one side that is located no pole chamber on the cylinder sets up no pole chamber hydraulic fluid port, its characterized in that: the piston is provided with at least one axial through hole, and a buffer rod is arranged in the axial through hole.
2. The oil cylinder with the built-in buffer device as claimed in claim 1, wherein: and an orifice is arranged between the buffer rod and the axial through hole.
3. The oil cylinder with the built-in buffer device as claimed in claim 2, wherein: the buffer rod comprises a middle working section, a left sealing section and a right sealing section at two ends of the working section, the working section can slide along the axial through hole, the left sealing section is sealed with a left port of the axial through hole when the buffer rod moves to the tail end of a stroke rightwards, and the right sealing section is sealed with a right port of the axial through hole when the buffer rod moves to the tail end of the stroke leftwards; the working section is provided with at least one throttling opening, a throttling hole is formed between the throttling opening and the axial through hole, and the length of the throttling opening is larger than that of the axial through hole.
4. The oil cylinder with the built-in buffer device as claimed in claim 3, wherein: the diameters of the left sealing section and the right sealing section are larger than that of the working section.
5. The oil cylinder with the built-in buffer device as claimed in claim 4, wherein: a left round table with the upper bottom diameter being the same as that of the working section and the lower bottom diameter being the same as that of the left sealing section is arranged between the left sealing section and the working section, and the outer side surface of the left round table is sealed with the left port of the axial through hole when the buffer rod moves to the tail end of the stroke rightwards; and a right round table with the same upper bottom diameter as the working section and the same lower bottom diameter as the right sealing section is arranged between the right sealing section and the working section, and the outer side surface of the right round table is sealed with the right port of the axial through hole when the buffer rod moves leftwards to the tail end of the stroke.
6. The oil cylinder with the built-in buffer device as claimed in claim 3, wherein: the throttling opening is arranged in the middle of the working section along the axial direction of the buffer rod, and the throttling opening is a notch obtained by removing a part of a cylinder with a minor arc-shaped cross section on the working section of the buffer rod.
7. The cylinder with the built-in buffer device as claimed in claim 3, 4, 5 or 6, wherein: the number of the throttling openings is 3, and the throttling openings are uniformly arranged on the outer cylindrical surface of the working section of the buffer rod along the circumferential direction.
8. The oil cylinder with the built-in buffer device as claimed in claim 3, wherein: when the buffer rod moves to the tail end of the stroke rightwards, the distance between the left end of the buffer rod and the cylinder bottom is larger than the distance between the left end of the piston rod and the cylinder bottom; when the buffer rod moves to the tail end of the stroke leftwards, the distance between the right end of the buffer rod and the end cover is larger than the distance between the right end of the piston and the end cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022357181.7U CN213684772U (en) | 2020-10-21 | 2020-10-21 | Oil cylinder with built-in buffer device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022357181.7U CN213684772U (en) | 2020-10-21 | 2020-10-21 | Oil cylinder with built-in buffer device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213684772U true CN213684772U (en) | 2021-07-13 |
Family
ID=76758939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022357181.7U Active CN213684772U (en) | 2020-10-21 | 2020-10-21 | Oil cylinder with built-in buffer device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213684772U (en) |
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2020
- 2020-10-21 CN CN202022357181.7U patent/CN213684772U/en active Active
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Effective date of registration: 20231211 Address after: 017200 A01-1 Factory Building, Precision Manufacturing Industrial Park, Airport Logistics Park, Ejin Horo Banner, Ordos City, Inner Mongolia Autonomous Region Patentee after: Inner Mongolia Huachen Intelligent Equipment Manufacturing Co.,Ltd. Address before: 250101 2-603, Xinsheng building, 1299 Xinluo street, high tech Zone, Jinan City, Shandong Province Patentee before: Jinan Huachen Industrial Co.,Ltd. |