CN111456981B - Built-in bidirectional pressure relief oil cylinder - Google Patents
Built-in bidirectional pressure relief oil cylinder Download PDFInfo
- Publication number
- CN111456981B CN111456981B CN202010443189.7A CN202010443189A CN111456981B CN 111456981 B CN111456981 B CN 111456981B CN 202010443189 A CN202010443189 A CN 202010443189A CN 111456981 B CN111456981 B CN 111456981B
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- hole
- valve core
- oil
- piston rod
- cylinder
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- 230000002457 bidirectional effect Effects 0.000 title claims description 11
- 238000007906 compression Methods 0.000 claims abstract description 13
- 230000006835 compression Effects 0.000 claims abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract description 5
- 238000005192 partition Methods 0.000 claims abstract 2
- 238000007789 sealing Methods 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 108
- 239000010720 hydraulic oil Substances 0.000 abstract description 17
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2215/00—Fluid-actuated devices for displacing a member from one position to another
- F15B2215/30—Constructional details thereof
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The utility model provides a built-in two-way release hydro-cylinder, relate to hydro-cylinder technical field, it includes the cylinder, the piston and the piston rod of connecting the piston, the piston rod can stretch out from the left end of cylinder, the piston becomes left oil pocket and right oil pocket with the cylinder internal partition, left oil pocket is equipped with left hydraulic fluid port, right oil pocket is equipped with right hydraulic fluid port, the valve opening has been seted up along the axial to the right terminal surface of piston rod, the through-hole has been seted up along radial to the piston rod, the left end and the through-hole intercommunication of valve opening are equipped with mobilizable left case and right case in the valve opening, be connected with compression spring between left case and the right case, fixedly on the inner wall of valve opening be provided with left stop collar and right stop collar, the interval is provided with a plurality of left archs on the outer wall of left case, the interval is provided with a plurality of right archs on the outer wall of right case. The invention can timely release pressure after the piston moves to the limit position, avoid the phenomenon of hydraulic oil cylinder expansion and ensure the stability of the oil cylinder during operation.
Description
Technical Field
The invention relates to the technical field of oil cylinders, in particular to a built-in bidirectional pressure relief oil cylinder.
Background
The oil cylinder comprises a cylinder barrel, a piston rod and a piston connected with the piston rod, the interior of the cylinder barrel is generally divided into two mutually independent cavities by the piston, oil ports are respectively arranged in the two cavities, and hydraulic oil is filled into one of the oil ports to enable the piston to move in the cylinder barrel so as to drive the piston rod to operate, so that the oil cylinder does work on the outside.
The existing oil cylinder is not provided with a pressure relief structure generally, after the piston moves to the limit position of one end of the cylinder barrel, if the cylinder barrel is continuously filled with hydraulic oil, the phenomenon of cylinder expansion is found, the hydraulic oil is heated due to compression, so that the working stability of the oil cylinder is affected, the service life of the oil cylinder is shortened, and even damage is possibly caused.
Disclosure of Invention
The invention aims to provide a built-in bidirectional pressure relief oil cylinder, which can timely relieve pressure after a piston moves to a limit position, avoid the phenomenon of hydraulic oil cylinder expansion and ensure the stability of the oil cylinder during operation.
In order to solve the technical problems, the invention adopts the following technical scheme: the built-in bidirectional pressure relief oil cylinder comprises a cylinder barrel, a piston and a piston rod connected with the piston, wherein the piston rod can extend out of the left end of the cylinder barrel, the piston divides the interior of the cylinder barrel into a left oil cavity and a right oil cavity, the left oil cavity is provided with a left oil port, and the right oil cavity is provided with a right oil port.
The piston rod is provided with a valve hole for communicating a right oil cavity along the axial direction, the piston rod is provided with a through hole for communicating a left oil cavity along the radial direction, the left end of the valve hole is communicated with the through hole, a movable left valve core and a movable right valve core are arranged in the valve hole, a compression spring is connected between the left valve core and the right valve core, a left limit sleeve and a right limit sleeve are fixedly arranged on the inner wall of the valve hole, a plurality of left bulges are arranged on the outer wall surface of the left valve core at intervals, a plurality of right bulges are arranged on the outer wall surface of the right valve core at intervals, the left end surface of the left valve core is provided with a left oil hole capable of communicating the through hole, the side surface of the left valve core is provided with a left through hole for communicating a right oil cavity, the side surface of the right valve core is provided with a right through hole for communicating the right oil hole, and the left bulge can lean against the left limit sleeve to the left side and the right limit sleeve to the right side under the elastic action of the compression spring.
The piston rod of the left oil cavity is sleeved with a ring body, the inner diameter of the ring body is larger than the outer diameter of the piston rod, a pin penetrates through the through hole and the diameter of the pin is smaller than the inner diameter of the through hole, the pin penetrates through the left valve core, two ends of the pin extend out of the through hole and are connected with the ring body, the pin and the left oil hole do not interfere with each other, an oil limiting hole which is communicated with the through hole and can allow the left end of the left valve core to extend in is formed in the piston rod, a stop block used for propping against the ring body is arranged on the inner wall of the left oil cavity, a lug used for propping against the right valve core is arranged on the right end face of the right oil cavity, and the lug and the right oil hole do not interfere with each other.
When the piston rod moves leftwards until the ring body abuts against the stop block, the ring body and the piston rod can generate relative displacement so as to drive the pin to move rightwards, so that the pin abuts against the inner wall of the through hole rightwards, and meanwhile, the pin can drive the left valve core to move rightwards until the left end face of the left valve core is withdrawn from the oil limiting hole, so that the left oil hole is communicated with the through hole, and the left through hole is withdrawn from the left limiting sleeve at the moment; when the piston rod moves to the right until the right valve core abuts against the convex block, the right valve core can move to the left relative to the valve hole, so that the right through hole is withdrawn from the right limiting sleeve.
Preferably, the left valve core and the right valve core are both in cylindrical structures.
More preferably, the right end face of the left valve core and the left end face of the right valve core are respectively provided with a guide block which stretches into the compression spring.
More preferably, the right end of the left oil hole is connected with the left through hole through a section of left horn hole with gradually enlarged diameter; the left end of the right oil hole is connected with the right through hole through a section of right horn hole with gradually enlarged diameter.
More preferably, the left through hole penetrates the left valve core in a radial direction of the left valve core; the right through hole penetrates through the right valve core along the radial direction of the right valve core.
More preferably, the left end of the left oil hole is positioned at an eccentric position of the end face of the left valve core; the right end of the right oil hole is positioned at the eccentric position of the end face of the right valve core.
More preferably, the right end face of the right valve core is an arc face with a raised middle part.
More preferably, the outer wall surface of the left limit sleeve and the outer wall surface of the right limit sleeve are both clamped with sealing rings.
The invention has the beneficial effects that: when the piston rod stretches out to the extreme position to the left, valve opening inside switches on and makes left oil pocket and right oil pocket intercommunication, last to the right side in the hydraulic oil that the oil pocket fills just can get into left oil pocket and carry out the oil drainage from left hydraulic fluid port, and the same reason, when the piston rod was to the right back to extreme position, valve opening inside also can switch on and make right oil pocket and left oil pocket intercommunication, last to the left side in the hydraulic oil of oil pocket in part just can get into right oil pocket and carry out the oil drainage from right oil port, through reaching the purpose of pressure release at above-mentioned oil drainage, can effectively avoid the phenomenon of jar that rises, guarantee the stability of hydro-cylinder during operation.
Drawings
FIG. 1 is a schematic cross-sectional view of an overall structure in an embodiment of the invention;
FIG. 2 is a schematic top view of the overall structure of an embodiment of the present invention;
FIG. 3 is an enlarged schematic view of the structure A in FIG. 1 (where the valve opening is open and oil is drained from the right port);
fig. 4 is a schematic view of the internal structure of the embodiment when the valve hole is opened and oil is drained from the left oil port;
Fig. 5 is a schematic diagram of the structure of the embodiment assuming that the left spool and the right spool are both in the closed state when there is no hydraulic oil force.
The reference numerals are:
1-cylinder barrel 2-piston 3-piston rod
4-Left oil port 5-right oil port 6-valve hole
7-Through hole 8-left valve core 8 a-left protrusion
8 B-left oil hole 8 c-Zuo Guankong-right valve core
9 A-right bulge 9 b-right oil hole 9 c-right through hole
10-Compression spring 11 a-left limit sleeve 11 b-right limit sleeve
11 C-seal ring 12-ring body 13-pin
14-Oil limiting hole 15-stop block 16-bump.
Detailed Description
The invention will be further described with reference to examples and drawings, to which reference is made, but which are not intended to limit the scope of the invention.
It should be noted in advance that, in the present invention, unless explicitly specified and limited otherwise, terms such as "mounted," "connected," "fixed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, in the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" on a second feature may include both the first and second features being in direct contact, or may include both the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature. The terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
As shown in fig. 1-4, the built-in bidirectional pressure relief oil cylinder comprises a cylinder barrel 1, a piston 2 and a piston rod 3 connected with the piston 2, wherein the piston rod 3 can extend out from the left end of the cylinder barrel 1, the piston 2 divides the interior of the cylinder barrel 1 into a left oil cavity and a right oil cavity, the left oil cavity is provided with a left oil port 4, and the right oil cavity is provided with a right oil port 5.
The right end face of the piston rod 3 is axially provided with a valve hole 6 communicated with a right oil cavity, the piston rod 3 is radially provided with a through hole 7 communicated with a left oil cavity, the left end of the valve hole 6 is communicated with the through hole 7, a movable left valve core 8 and a right valve core 9 are arranged in the valve hole 6, a compression spring 10 is connected between the left valve core 8 and the right valve core 9, the inner wall of the valve hole 6 is fixedly provided with a left limit sleeve 11a and a right limit sleeve 11b, the outer wall surface of the left valve core 8 is provided with a plurality of left bulges 8a at intervals, the outer wall surface of the right valve core 9 is provided with a plurality of right bulges 9a at intervals, the left end face of the left valve core 8 is provided with a left oil hole 8b communicated with the through hole 7, the side face of the left valve core 8 is provided with a left through hole 8c communicated with the left oil hole 8b, the right end face of the right valve core 9 is provided with a right oil hole 9b communicated with the right oil cavity, the side face of the right valve core 9 is provided with a right through hole 9c communicated with the right oil cavity, and under the elastic force of the compression spring 10, the left bulges 8a can lean against the left limit sleeve 11a and enable the left bulges 11a to lean against the left limit sleeve 11a and the right limit sleeve 11b to seal the left through hole 11a and the right through hole 11b as shown in the figure 5 b.
The piston rod 3 positioned in the left oil cavity is sleeved with a ring body 12, the inner diameter of the ring body 12 is larger than the outer diameter of the piston rod 3, a pin 13 is arranged in the through hole 7 in a penetrating manner, the diameter of the pin 13 is smaller than that of the through hole 7, the pin 13 penetrates through the left valve core 8, two ends of the pin 13 extend out of the through hole 7 and are connected with the ring body 12, the pin 13 and the left oil hole 8b are not interfered with each other, an oil limiting hole 14 which is communicated with the through hole 7 and can allow the left end of the left valve core 8 to extend in is arranged in the piston rod 3, a stop 15 for supporting the ring body 12 is arranged on the inner wall of the left oil cavity, a lug 16 for supporting the right valve core 9 is arranged on the right end face of the right oil cavity, and the lug 16 and the right oil hole 9b are not interfered with each other.
The working principle of the built-in bidirectional pressure relief oil cylinder provided by the embodiment is as follows: in the process that the piston rod 3 stretches out leftwards, hydraulic oil enters the right oil cavity through the right oil port 5 to push the piston 2 to move leftwards, at the moment, the right valve core 9 moves leftwards due to thrust force to enable the right through hole 9c to withdraw from the right limiting sleeve 11b and keep the state, so that a passage is formed among the right oil cavity, the right oil hole 9b, the right through hole 9c and the two valve cores, the right valve core 9 is kept in an open state, hydraulic oil can enter between the two valve cores, at the moment, the left valve core 8 also receives leftwards thrust force to enable the left bulge 8a to abut against the left limiting sleeve 11a leftwards, namely, at the moment, the left through hole 11a is blocked by the left limiting sleeve 11a (and at the moment, the left end face of the left valve core 8 also stretches into the oil limiting hole 14), in this state, hydraulic oil can smoothly push the piston 2 to move left, when the piston rod 4 extends to the left to the limit position, the ring body 12 can prop against the stop block 15 and generate relative displacement with the piston rod 3 so as to drive the pin 13 to move right, so that the pin 13 is propped against the inner wall of the through hole 7, and meanwhile, the pin 13 can drive the left valve core 8 to move right until the left end face of the left valve core 8 withdraws from the oil limiting hole 14, so that the left oil hole 8b is communicated with the through hole 7, and at the moment, the left through hole 8c withdraws from the left limiting sleeve 11a, at this moment, hydraulic oil between the two valve cores can enter from the left through hole 8c, enter into the left oil cavity after passing through the left oil hole 8b and the through hole 7, and finally be discharged from the left oil hole 4 to realize pressure relief, and the specific pressure relief flow direction of the hydraulic oil is shown in fig. 3.
During the rightward retraction of the piston rod 3, hydraulic oil enters the left oil cavity through the left oil port 4, the ring body 12 is pushed to move rightward, so that the pin 13 abuts against the inner wall of the 7 rightward, and the pin 13 drives the left valve core to move rightward until the left through hole 8c is retracted from the left limit sleeve 11a, that is, the left valve core 8 is kept in an open state (and the left end face of the left valve core 8 is also retracted from the oil limiting hole 14), hydraulic oil can enter a region between the two valve cores through the left oil cavity, and at the moment, since the right valve core 9 is also subjected to rightward thrust, the right through hole 8c is in a state of being blocked by the right limit sleeve 11b, the hydraulic oil can smoothly push the piston 2 to move rightward until the right valve core 9 abuts against the bump 16, the piston rod 3 can continue to advance for a small distance, and then the right valve core 9 moves leftward for a distance relative to the valve hole 6, so that the right through hole 9c is retracted from the right limit sleeve 11b, and the region between the two valve cores can be communicated, and the hydraulic oil in the region can enter the region through the right through hole 9c, and the right oil cavity 9b is discharged from the right oil cavity to the specific pressure relief direction as shown in fig. 2.
Preferably, the left valve core 8 and the right valve core 9 are both in cylindrical structures, and the right end face of the left valve core 8 and the left end face of the right valve core 9 are respectively provided with a guide block extending into the compression spring 10, so that the compression spring 10 has better stability through the arrangement of the guide blocks.
More preferably, the right end of the left oil hole 8b is connected to the left through hole 8c through a left flared hole with a gradually enlarged diameter, and the diameter of the left through hole 8c is larger than that of the left oil hole 8b, the left end of the right oil hole 9b is connected to the right through hole 9c through a right flared hole with a gradually enlarged diameter, and the diameter of the right through hole 9c is larger than that of the right oil hole 9b, so that oil can smoothly flow by providing the flared hole, and pressure fluctuation of the oil can be reduced.
More preferably, the left through hole 8c penetrates the left valve core 8 along the radial direction of the left valve core 8, the right through hole 9c penetrates the right valve core 9 along the radial direction of the right valve core 9, the left end of the left oil hole 8b is located at the eccentric position of the end surface of the left valve core 8, interference between the left oil hole 8b and the pin 13 can be effectively avoided, the right end of the right oil hole 9b is located at the eccentric position of the end surface of the right valve core 9, interference between the right oil hole 9b and the protruding block 16 can be effectively avoided, and the left end of the protruding block 16 is blocked by the protruding block 16, and of course, the area of the left end of the protruding block 16 is far smaller than the area of the right end surface of the right valve core 9.
More preferably, the right end surface of the right valve core 9 is an arc surface with a raised middle part, and accordingly, the middle part of the arc surface can contact the bump 16.
In addition, in this embodiment, the outer wall surface of the left stop collar 11a and the outer wall surface of the right stop collar 11b are both clamped with sealing rings 11c, so as to improve the sealing effect of the two valve cores.
The foregoing embodiments are preferred embodiments of the present invention, and in addition, the present invention may be implemented in other ways, and any obvious substitution is within the scope of the present invention without departing from the concept of the present invention.
In order to facilitate understanding of the improvements of the present application over the prior art, some of the figures and descriptions of the present application have been simplified and some other elements have been omitted for clarity, as will be appreciated by those of ordinary skill in the art.
Claims (8)
1. The utility model provides a built-in two-way release hydro-cylinder, includes cylinder (1), piston (2) and connects piston (2) piston rod (3), piston rod (3) can stretch out from the left end of cylinder (1), piston (2) become left oil pocket and right oil pocket with cylinder (1) internal partition, left oil pocket is equipped with left hydraulic fluid port (4) right oil pocket is equipped with right hydraulic fluid port (5), its characterized in that:
the piston rod (3) is provided with a valve hole (6) communicated with a right oil cavity along the axial direction, the piston rod (3) is provided with a through hole (7) communicated with a left oil cavity along the radial direction, the left end of the valve hole (6) is communicated with the through hole (7), the valve hole (6) is internally provided with a movable left valve core (8) and a right valve core (9), a compression spring (10) is connected between the left valve core (8) and the right valve core (9), the inner wall of the valve hole (6) is fixedly provided with a left limit sleeve (11 a) and a right limit sleeve (11 b), the outer wall surface of the left valve core (8) is provided with a plurality of left bulges (8 a), the outer wall surface of the right valve core (9) is provided with a plurality of right bulges (9 a), the left end surface of the left valve core (8) is provided with a left oil hole (8 b) capable of being communicated with the through hole (7), the side surface of the left valve core (8) is provided with a left through hole (8 c) communicated with the left oil cavity (8 b), the right end surface of the right valve core (9) is provided with a right end surface of the valve core (9) is fixedly provided with a left through hole (9 b), the side surface of the right valve core (9) is provided with an elastic force of the compression spring (9 b) is provided with the lower valve core, the left bulge (8 a) can be propped against the left limit sleeve (11 a) to the left, so that the left limit sleeve (11 a) seals the left through hole (8 c), the right bulge (9 a) can be propped against the right limit sleeve (11 b) to the right, and the right limit sleeve (11 b) seals the right through hole (9 c);
The piston rod (3) of the left oil cavity is sleeved with a ring body (12), the inner diameter of the ring body (12) is larger than the outer diameter of the piston rod (3), a pin (13) is arranged on the through hole (7) in a penetrating mode, the diameter of the pin (13) is smaller than the inner diameter of the through hole (7), the pin (13) penetrates through the left valve core (8) and two ends of the pin extend out of the through hole (7) and are connected with the ring body (12), the pin (13) and the left oil hole (8 b) are not interfered with each other, an oil limiting hole (14) which is communicated with the through hole (7) and can allow the left end of the left valve core (8) to extend in is arranged in the piston rod (3), a stop block (15) used for propping against the ring body (12) is arranged on the inner wall of the left oil cavity, a lug (16) used for propping against the right valve core (9) is arranged on the right end face of the right oil cavity, and the lug (16) and the right oil hole (9 b) are not interfered with each other;
When the piston rod (3) moves leftwards until the ring body (12) abuts against the stop block (15), the ring body (12) can generate relative displacement with the piston rod (3) so as to drive the pin (13) to move rightwards, so that the pin (13) abuts against the inner wall of the through hole (7) rightwards, and meanwhile, the pin (13) can drive the left valve core (8) to move rightwards until the left end face of the left valve core (8) withdraws from the oil limiting hole (14), so that the left oil hole (8 b) is communicated with the through hole (7), and the left through hole (8 c) withdraws from the left limiting sleeve (11 a);
When the piston rod (3) moves to the right until the right valve core (9) abuts against the protruding block (16), the right valve core (9) can move to the left relative to the valve hole (6), so that the right through hole (9 c) is withdrawn from the right limiting sleeve (11 b).
2. The built-in bidirectional pressure relief cylinder as set forth in claim 1, wherein: the left valve core (8) and the right valve core (9) are both in cylinder structures.
3. The built-in bidirectional pressure relief cylinder as set forth in claim 2, wherein: the right end face of the left valve core (8) and the left end face of the right valve core (9) are respectively provided with a guide block which stretches into the compression spring (10).
4. The built-in bi-directional pressure relief cylinder as set forth in claim 3 wherein: the right end of the left oil hole (8 b) is connected with the left through hole (8 c) through a section of left horn hole with gradually enlarged diameter; the left end of the right oil hole (9 b) is connected with the right through hole (9 c) through a section of right horn hole with gradually enlarged diameter.
5. The built-in bi-directional pressure relief cylinder as set forth in claim 4, wherein: the left through hole (8 c) penetrates through the left valve core (8) along the radial direction of the left valve core (8); the right through hole (9 c) penetrates through the right valve core (9) along the radial direction of the right valve core (9).
6. The built-in bi-directional pressure relief cylinder as set forth in claim 5, wherein: the left end of the left oil hole (8 b) is positioned at the eccentric position of the end face of the left valve core (8); the right end of the right oil hole (9 b) is positioned at the eccentric position of the end face of the right valve core (9).
7. The built-in bidirectional pressure relief cylinder as set forth in claim 1, wherein: the right end face of the right valve core (9) is an arc face with a raised middle part.
8. The built-in bidirectional pressure relief cylinder as set forth in claim 1, wherein: the outer wall surface of the left limit sleeve (11 a) and the outer wall surface of the right limit sleeve (11 b) are respectively provided with a sealing ring (11 c).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010443189.7A CN111456981B (en) | 2020-05-22 | 2020-05-22 | Built-in bidirectional pressure relief oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010443189.7A CN111456981B (en) | 2020-05-22 | 2020-05-22 | Built-in bidirectional pressure relief oil cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111456981A CN111456981A (en) | 2020-07-28 |
| CN111456981B true CN111456981B (en) | 2024-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010443189.7A Active CN111456981B (en) | 2020-05-22 | 2020-05-22 | Built-in bidirectional pressure relief oil cylinder |
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| Country | Link |
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| CN (1) | CN111456981B (en) |
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| US6408871B1 (en) * | 2000-09-06 | 2002-06-25 | The United States Of America As Represented By The Secretary Of The Navy | Two way pressure relief valve |
| CN106050776A (en) * | 2016-06-30 | 2016-10-26 | 江苏金荣森制冷科技有限公司 | Hydraulic bypass with adjustable piston type bidirectional pressure relief valve |
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| WO2017219876A1 (en) * | 2016-06-25 | 2017-12-28 | 玉环县现代工具有限公司 | Differential pressure unloading safety valve |
| CN108278237A (en) * | 2018-01-25 | 2018-07-13 | 陈艳艳 | Two-way level 2 buffering valve |
| CN212202699U (en) * | 2020-05-22 | 2020-12-22 | 湖南特达液压有限公司 | Built-in bidirectional pressure relief oil cylinder |
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2020
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| US6408871B1 (en) * | 2000-09-06 | 2002-06-25 | The United States Of America As Represented By The Secretary Of The Navy | Two way pressure relief valve |
| CN205715713U (en) * | 2016-06-02 | 2016-11-23 | 珠海市思卡净化技术有限公司 | Compressed air purifier firm cylinder piston mechanism guide valve is two-way unloads laminated structure |
| WO2017219876A1 (en) * | 2016-06-25 | 2017-12-28 | 玉环县现代工具有限公司 | Differential pressure unloading safety valve |
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| CN108278237A (en) * | 2018-01-25 | 2018-07-13 | 陈艳艳 | Two-way level 2 buffering valve |
| CN212202699U (en) * | 2020-05-22 | 2020-12-22 | 湖南特达液压有限公司 | Built-in bidirectional pressure relief oil cylinder |
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| CN111456981A (en) | 2020-07-28 |
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