CN110282159B - Three-stage actuator cylinder with air/liquid inlet and outlet at end part and working method thereof - Google Patents
Three-stage actuator cylinder with air/liquid inlet and outlet at end part and working method thereof Download PDFInfo
- Publication number
- CN110282159B CN110282159B CN201910422678.1A CN201910422678A CN110282159B CN 110282159 B CN110282159 B CN 110282159B CN 201910422678 A CN201910422678 A CN 201910422678A CN 110282159 B CN110282159 B CN 110282159B
- Authority
- CN
- China
- Prior art keywords
- sleeve
- section
- locking
- air
- inner sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000007788 liquid Substances 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 50
- 239000010959 steel Substances 0.000 claims abstract description 50
- 230000007246 mechanism Effects 0.000 claims abstract description 27
- 230000033001 locomotion Effects 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 230000009471 action Effects 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims description 10
- 230000008093 supporting effect Effects 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000001939 inductive effect Effects 0.000 abstract description 2
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
- B64G1/62—Systems for re-entry into the earth's atmosphere; Retarding or landing devices
Landscapes
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Aviation & Aerospace Engineering (AREA)
- Actuator (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention discloses a three-stage actuator cylinder with air inlet and exhaust at the end part and a working method thereof, wherein the three-stage actuator cylinder comprises the following steps: the device comprises an end cover, a first section of sleeve, a second section of sleeve, a third section of sleeve, an inner sleeve, a locking sleeve, a spring, a sliding block, a limiting nut, a support ring, a sealing ring, an annular touch sheet, an inner sleeve contact ring, a steel ball, an air pipe, a motion conversion rod and a button switch. The main technical key points of the mechanism are that the actuator cylinder is driven to move by liquid/air pressure, and the inner sleeve and the sliding block move relatively under the action of the spring, so that the locking and unlocking of the steel ball lock are realized, and finally the functions of unfolding, locking, folding and unlocking of the three-stage actuator cylinder are achieved. The mechanism skillfully utilizes the air pipe, and can ensure that the oil (air) inlet and the oil (air) outlet which are expanded and contracted are all arranged at the end cover, thereby greatly facilitating the arrangement of an external driving system and a hydraulic (air) pressure pipeline. Compared with an inductive travel switch, the mechanical travel switch has the advantages of higher accuracy and higher reliability in reflecting the movement travel of the sleeve.
Description
Technical Field
The invention relates to a three-stage actuator cylinder with an expansion locking function and air/liquid inlet and outlet at the end part and a working method thereof, belonging to the technical field of landing support legs for returning a carrier.
Background
With the launch and recovery success of reusable vehicles, reusable vehicle landing legs have been used, which typically have to be retracted within the housing in order to reduce the additional aerodynamic drag presented by landing legs mounted to the surface of the vehicle, and opened by pneumatic/hydraulic actuation when the vehicle is about to land. Meanwhile, as the carrier can generate larger impact load to the landing support leg in the landing process, in order to ensure that the landing support leg can reliably support the carrier under the action of the load and prevent the carrier from overturning, the landing support leg needs to be reliably locked by the locking device after being completely extended, and after the carrier is landed and recovered, the landing support leg can be unlocked and retracted in an air/hydraulic transmission mode. Therefore, for the landing leg of the reusable carrier, it must have the features of high load bearing, high reliability, long deployment stroke, reusability, etc.
The conventional landing leg retracting and releasing mechanism of the carrier is generally complicated in structure, and is mainly released from an initial locking state through an initiating explosive device, and then is unfolded by using a torsion spring on a hinge of an unfolding bracket, so that the conventional landing leg retracting and releasing mechanism cannot be reused. And for the traditional multistage retractable actuating cylinders, the functions of automatic locking and unlocking are not usually provided, and the requirement of high bearing capacity of landing legs cannot be met. Meanwhile, for the traditional retractable actuating cylinder, the advantage of long unfolding stroke brought by multi-stage unfolding is not achieved.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, an object of the present invention is to provide a three-stage actuator cylinder with air/liquid intake/exhaust at the end and a working method thereof, so as to solve the problems that the conventional multi-stage retractable actuator cylinder in the prior art does not have the functions of automatic locking and unlocking, cannot meet the requirement of high bearing capacity of landing legs, and does not have the long deployment stroke caused by multi-stage deployment.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention relates to a three-stage actuating cylinder with air inlet and exhaust at the end part, which comprises: the locking device comprises an end cover, a first section of sleeve, a second section of sleeve, a third section of sleeve, an upper inner sleeve, a lower inner sleeve, a locking sleeve, an upper spring, an upper sliding block, an upper limiting nut, a support ring, a sealing ring, an upper annular touch piece, an inner sleeve contact ring, a steel ball, an upper air pipe and a lower air pipe, wherein the locking sleeve is arranged among the end cover, the first section of sleeve and the upper inner sleeve and is in clearance fit;
the upper inner sleeve is arranged on the upper locking sleeve, and the outer wall of the lower end of the upper inner sleeve is provided with threads; the upper limiting nut is fixedly connected with the lower end of the upper inner sleeve through the inner wall thread on the upper limiting nut;
the upper sliding block is provided with a circular ring, a plurality of through holes are formed in the circular ring and used for communicating an upper oil chamber with a lower oil chamber of the upper sliding block, so that pressure difference cannot be generated when the upper sliding block and an upper inner sleeve perform axial relative motion, the step of the upper sliding block is used for placing an upper spring, the upper sliding block, the upper inner sleeve and the upper locking sleeve are in clearance fit, a plurality of small circular grooves are formed in the outer portion of the lower end of the upper sliding block, the diameter of each small circular groove is consistent with that of a steel ball, and the small circular grooves are used for supporting the steel ball when the device is in an unlocking state;
the upper spring is arranged on the outer circle of the upper inner sleeve barrel body, a certain gap is reserved between the upper spring and the outer wall of the upper inner sleeve barrel body, the upper spring is in a compressed state in the whole locking and unlocking process, the spring force is used for pushing the upper sliding block to move downwards, and the compression amount of the upper spring in the unlocking state is larger than that of the upper spring in the locking state; the upper limiting nut is used for limiting the upper sliding block, the support ring is arranged at the annular groove on the outer wall of the locking sleeve and used for radially supporting the locking sleeve, and the sealing ring is arranged at the annular groove on the outer wall of the locking sleeve and used for sealing the locking sleeve, the end cover, the locking sleeve and the first section of sleeve;
the upper air pipe is fixedly connected with the end cover and is provided with a sealing ring seal, the lower air pipe slides up and down on the outer surface of the upper air pipe, the lower end of the lower air pipe is provided with a boss, the lower inner sleeve pushes the lower air pipe to slide down through the boss in the locking process, and the sealing ring seal is arranged between the upper air pipe and the lower air pipe; when the device is unfolded and unlocked, air/oil is fed from the right end of the end cover, and air/oil is discharged from the left end; when the device is unlocked and contracted, air/oil is fed from the left end of the end cover, and air/oil is discharged from the right end of the end cover;
the inner sleeve contact ring is fixedly connected with the lower inner sleeve through a screw, and in the unlocking process, the third section of sleeve is pushed to unlock after being unlocked, namely, force is transferred through the contact of the inner sleeve contact ring and the upper inner sleeve, so that the second section of sleeve is pushed to unlock;
the tertiary ram further comprises: the lower end of the lower locking sleeve is provided with an internal thread of a circumferential circle, and the lower locking sleeve is fixedly connected with the third section sleeve through the external thread matching of the internal thread and the external circle at the upper end of the sleeve.
Furthermore, two layers of steps are arranged on the inner wall of the locking sleeve, the upper step is provided with a space for placing the upper spring, and the lower step limits the position of the upper sliding block.
Furthermore, the locking sleeve is annularly provided with a plurality of through holes for placing steel balls and a plurality of threaded through holes, and the locking screw fixedly connects the locking sleeve and the second section of sleeve through the threaded through holes and the through holes radially distributed at the upper end of the second section of sleeve.
Furthermore, a plurality of lightening holes are annularly arranged at the upper end of the upper locking sleeve, so that pressure difference between the upper air chamber and the lower air chamber of the upper inner sleeve is avoided when the upper locking sleeve and the upper inner sleeve move axially relative to each other.
Further, the upper air pipe and the lower air pipe enable the expanded/contracted air inlet/outlet/oil ports to be arranged at the end covers, and additional space is not occupied, so that the arrangement of an external driving system and an air/hydraulic pipeline is facilitated.
Further, the tertiary ram further comprises: and the motion conversion rod converts the downward motion of the upper annular touch sheet into the rightward motion of the motion conversion rod, so that the button switch is triggered, and the button switch transmits a sleeve in-place locking signal outwards through a wire.
Furthermore, a plurality of through holes which are symmetrically distributed are annularly formed in the upper ends of the second section of sleeve and the third section of sleeve and are used for air/liquid circulation.
The invention relates to a working method of a three-stage actuating cylinder with air inlet and outlet/liquid at the end part, which comprises the following steps:
when the landing support leg is unfolded, starting an air/hydraulic system, filling air/liquid into the right side of the upper end of the end cover, pushing the upper inner sleeve to move downwards, namely driving the second section of sleeve, the third section of sleeve and the two-stage steel ball lock mechanism to move downwards completely until the first steel ball slides into the groove in the inner wall of the first section of sleeve, and completing locking of the first-stage steel ball lock until the first section of sleeve and the second section of sleeve are locked; then the gas/hydraulic pressure continues to push the inner sleeve contact ring to move downwards, namely, the third section of sleeve and the second-stage steel ball lock mechanism are driven to move downwards until the second steel ball slides into the groove in the inner wall of the second section of sleeve, and the second-stage steel ball lock completes locking until the first section of sleeve, the second section of sleeve and the third section of sleeve are locked; at the moment, the whole mechanism is unfolded and locked;
when the landing support leg is contracted, starting an air/hydraulic system, filling air/liquid into the left side of the upper end of the end cover, pushing the lower sliding block, the lower limiting nut, the lower inner sleeve and the inner sleeve to contact the ring and move upwards, so that the second steel ball falls off from the groove of the second section of sleeve, and the second-stage steel ball lock mechanism completes unlocking, namely the second section of sleeve and the third section of sleeve are unlocked; then the second-stage steel ball lock mechanism and the third section of sleeve move upwards together until the inner sleeve contact ring touches the upper inner sleeve, so that force is transmitted upwards, the upper sliding block, the upper limiting nut and the upper inner sleeve are pushed to move upwards, the first steel ball falls off from the groove of the first section of sleeve, and the first-stage steel ball lock mechanism completes unlocking, namely the first section of sleeve and the second section of sleeve are unlocked; at this point, the tertiary ram is fully unlocked and eventually moves to a fully retracted state under the continued pneumatic/hydraulic action.
The invention has the beneficial effects that:
the invention combines the steel ball lock mechanism with strong bearing capacity with the multi-stage actuating cylinders, so that the mechanism has the characteristics of high bearing capacity, long actuating cylinder unfolding stroke, high locking and unlocking reliability and reusability, and is suitable for landing legs of reusable carriers. The air pipe can make the oil (air) inlet and outlet at the end cover, which is convenient for the arrangement of the external driving system and the hydraulic (air) pressure pipeline. Compared with an inductive travel switch, the mechanical travel switch has the advantages that the accuracy of reflecting the movement travel of the sleeve is higher, and the reliability is higher. Meanwhile, the mechanism is simple to machine, convenient to assemble, capable of achieving automatic winding and unwinding and long in service life.
Drawings
Fig. 1 is a fully retracted configuration of the three stage ram.
Fig. 2 is a schematic diagram of a fully deployed configuration of the three-stage ram.
Fig. 3 is a schematic view of the air tube structure of the three-stage actuator cylinder.
Fig. 4a is a schematic vertical view of the end cap of the three stage ram.
Fig. 4b is a schematic front view of the end cap of the three stage actuator cylinder.
Fig. 5 is a schematic view of a locking sleeve of the three-stage actuator.
Fig. 6 is a schematic view of the lower lock sleeve of the three-stage actuator.
Fig. 7 is a schematic view of the first section of the sleeve of the three-stage actuator.
Fig. 8 is a schematic view of the second section of the sleeve of the three stage ram.
Fig. 9 is a schematic view of a third joint sleeve of the three-stage actuator.
Fig. 10 is a schematic view of the travel switch of the three-stage actuator.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.
Referring to fig. 1 to 10, the present invention provides a three-stage ram with an intake/exhaust port at an end thereof, comprising: the device comprises an end cover 1, a first section of sleeve 23, a second section of sleeve 24, a third section of sleeve 25, an upper inner sleeve 2, a lower inner sleeve 14, an upper locking sleeve 3, an upper spring 5, a lower spring 17, an upper slider 8, a lower slider 20, an upper limit nut 9, a lower limit nut 21, support rings 4, 18, 28 and 30, seal rings 6, 7, 11, 15, 29 and 31 (each seal ring plays a sealing role on a to-be-sealed piece), an upper annular touch sheet 12, an inner sleeve contact ring 13, steel balls (a first steel ball 10 and a second steel ball 19), an upper air pipe 26, a lower air pipe 27, motion conversion rods 33 and 35 and button switches 34 and 36; wherein the content of the first and second substances,
the upper locking sleeve 3 is arranged between the end cover 1, the first section of sleeve 23 and the upper inner sleeve 2 and is in clearance fit, the inner wall of the upper locking sleeve 3 is provided with two layers of steps, the upper step is used for reducing weight and reserving a space for placing the upper spring 5, the lower step is used for limiting the position of the upper sliding block 8, the upper locking sleeve 3 is annularly provided with 8 through holes for placing the steel ball 10 and a plurality of threaded through holes, a locking screw fixedly connects the upper locking sleeve 3 with the second section of sleeve 24 through the threaded through holes and the through holes radially distributed at the upper end of the second section of sleeve 24, the lower end surface of the upper locking sleeve 3 is annularly provided with a plurality of threaded holes for fixedly connecting with the upper annular contact piece 12, and the outer wall of the upper locking sleeve 3 is provided with 3 annular grooves from top to bottom for placing the support ring 4, reducing weight and placing the seal ring 6 respectively; the holes arranged annularly at the upper end of the upper locking sleeve 3 can reduce weight, and simultaneously, when the upper locking sleeve 3 and the upper inner sleeve 2 move axially relative to each other, pressure difference is not generated between the upper oil cavity and the lower oil cavity of the upper inner sleeve 2.
The upper inner sleeve 2 is arranged on the upper locking sleeve 3 and is a cylinder with a step excircle, the outer wall of the lower end of the upper inner sleeve 2 is provided with threads, an upper limiting nut 9 is fixedly connected with the lower end of the upper inner sleeve 2 through the threads on the inner wall, and an upper spring 5 is arranged on the excircle of the upper inner sleeve 2 and has a certain gap with the outer wall of the upper inner sleeve 2;
the upper sliding block 8 is provided with a step ring, a plurality of through holes are formed in the ring direction of the upper sliding block 8 and used for communicating an upper oil (gas) chamber and a lower oil (gas) chamber of the upper sliding block 8, so that pressure difference cannot be generated when the upper sliding block 8 and the upper inner sleeve 2 move axially relative to each other, the step of the upper sliding block 8 is used for placing the upper spring 5, the upper sliding block 8, the upper inner sleeve 2 and the upper locking sleeve 3 are in clearance fit, the outer part of the lower end of the upper sliding block 8 is provided with 8 small circular grooves, the diameter of the small circular grooves is consistent with that of the first steel ball 10, and the small circular grooves are used for supporting the steel ball 10 when the device is in an unlocking state;
the upper spring 5 is arranged on the outer circle of the cylinder body of the upper inner sleeve 2, is in a compressed state in the whole locking and unlocking process, has a spring force for pushing the upper slide block 8 to move downwards, and has a larger compression amount when in the unlocking state than when in the locking state; the lower spring 17 is arranged on the outer circle of the cylinder body of the lower inner sleeve 14, is in a compressed state in the whole locking and unlocking process, has a spring force for pushing the lower sliding block 20 to move downwards, and has a larger compression amount than the lower spring 17 in the locking state when the lower spring 17 is in the unlocking state; the upper limiting nut 9 is used for limiting the upper sliding block 8, the support ring 4 is arranged at the annular groove on the outer wall of the upper locking sleeve 3 and is used for radially supporting the upper locking sleeve 3, and the seal ring 6 is arranged at the annular groove on the outer wall of the upper locking sleeve 3 and is used for sealing the upper locking sleeve 3, the end cover 1, the upper locking sleeve 3 and the first sleeve 23
The upper air pipe 26 is fixedly connected with the end cover 1 through a screw and is provided with a sealing ring seal, the lower air pipe 27 slides up and down on the outer surface of the upper air pipe 26, the lower end of the lower air pipe 27 is provided with a boss, the lower inner sleeve 14 pushes the lower air pipe 27 to slide down through the boss in the locking process, and the sealing ring seal is arranged between the upper air pipe 26 and the lower air pipe 27; the upper air pipe 26 and the lower air pipe 27 enable the expanded/contracted air inlet/outlet/oil ports to be arranged at the end cover 1 without additionally occupying space, so that the arrangement of an external driving system and a hydraulic (air) pressure pipeline is facilitated; when the device is unfolded and unlocked, oil/gas is discharged from the left end of the air/oil inlet at the right end of the end cover 1, and when the device is unlocked and contracted, the oil/gas is discharged from the right end of the air/oil inlet at the left end of the end cover 1.
It should be noted that the three-stage ram further includes: the lower lock sleeve 16 is different from the upper lock sleeve 3 in that the lower end of the lower lock sleeve 16 is not annularly provided with a plurality of threaded through holes but is provided with an annular ring of internal threads, and the lower lock sleeve 16 is fixedly connected with the external threads of the excircle of the upper end of the third section sleeve 25 through the internal threads.
The inner sleeve contact ring 13 is fixedly connected with the lower inner sleeve 14 through screws, and in the unlocking process, the third section of sleeve 25 is pushed to unlock the second section of sleeve 24 after being unlocked, namely, the force is transferred through the contact between the inner sleeve contact ring 13 and the upper inner sleeve 2, so that the second section of sleeve 24 is pushed to unlock.
The tertiary actuator cylinder further comprises: the motion conversion rods 33 and 35 can convert the downward motion of the upper annular touch piece 12 and the lower annular touch piece 22 into the rightward motion of the motion conversion rods 33 and 35 respectively, so as to trigger the button switches 34 and 36, the button switches 34 and 36 transmit sleeve in-place locking signals outwards through wires, and referring to fig. 10, the stroke switches are sealed through sealing rings and sealing glue. A third section flange 32 may be used to connect this deployment locking device to a possible external bumper or like mechanism. The upper ends of the second section of sleeve 24 and the third section of sleeve 25 are annularly provided with a plurality of through holes which are symmetrically distributed, and the purpose is to facilitate the circulation of air/liquid.
The invention relates to a working method of a three-stage actuating cylinder with air inlet and outlet/liquid at the end part, which comprises the following steps:
when the landing leg is unfolded, starting an air/hydraulic system, filling air/liquid into the right side of the upper end of the end cover 1, pushing the upper inner sleeve 2 to move downwards, namely driving the second section of sleeve 24, the third section of sleeve 25 and the two-stage steel ball lock mechanism to move downwards completely until the first steel ball 10 slides into the groove in the inner wall of the first section of sleeve 23, and completing locking of the first-stage steel ball lock until the first section of sleeve 23 and the second section of sleeve 24 are locked; then the gas/hydraulic pressure continues to push the inner sleeve contact ring 13 to move downwards, namely the third section of sleeve 25 and the second-stage steel ball lock mechanism are driven to move downwards until the second steel ball 19 slides into the groove in the inner wall of the second section of sleeve 24, and the second-stage steel ball lock mechanism completes locking until the first section of sleeve 23, the second section of sleeve 24 and the third section of sleeve 25 are locked; at this point the entire mechanism completes deployment locking.
When the landing support leg is contracted, starting an air/hydraulic system, filling air/liquid into the left side of the upper end of the end cover 1, pushing the lower sliding block 20, the lower limiting nut 21, the lower inner sleeve 14 and the inner sleeve contact ring 13 to move upwards, so that the second steel ball 19 falls off from the groove of the second section of sleeve 24, and the second-stage steel ball lock mechanism finishes unlocking, namely the second section of sleeve 24 and the third section of sleeve 25 are unlocked; then the second-stage steel ball lock mechanism and the third section of sleeve 25 move upwards together until the inner sleeve contact ring 13 touches the upper inner sleeve 2, so that the force is transmitted upwards, the upper slide block 8, the upper limiting nut 9 and the upper inner sleeve 2 are pushed to move upwards, the first steel ball 10 falls off from the groove of the first section of sleeve 23, and the first-stage steel ball lock mechanism completes unlocking, namely the first section of sleeve 23 and the second section of sleeve 24 are unlocked; at this point, the tertiary ram is fully unlocked and eventually moves to a fully retracted state under the continued pneumatic/hydraulic action.
While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. A three-stage actuator cylinder with end intake and exhaust, comprising: an end cover (1), a first section of sleeve (23), a second section of sleeve (24), a third section of sleeve (25), an upper inner sleeve (2), a lower inner sleeve (14), an upper locking sleeve (3), an upper spring (5), an upper slide block (8), an upper limiting nut (9), a support ring (4), a sealing ring (6), an upper annular touch sheet (12), an inner sleeve contact ring (13), a steel ball (10), an upper air pipe (26) and a lower air pipe (27), the locking sleeve (3) is arranged among the end cover (1), the first section of sleeve (23) and the upper inner sleeve (2), and are in clearance fit, the upper locking sleeve (3) is fixedly connected with the second section of sleeve (24), a plurality of threaded holes are annularly distributed on the end surface of the lower part of the upper locking sleeve (3), the locking sleeve is used for being fixedly connected with the upper annular touch sheet (12), and a plurality of annular grooves are formed in the outer wall of the locking sleeve (3) from top to bottom;
the upper inner sleeve (2) is arranged on the upper locking sleeve (3), and the outer wall of the lower end of the upper inner sleeve (2) is provided with threads; the upper limiting nut (9) is fixedly connected with the lower end of the upper inner sleeve (2) through the inner wall thread on the upper limiting nut;
the upper sliding block (8) is provided with a circular ring, a plurality of through holes are formed in the circular ring direction of the upper sliding block (8) and are used for communicating an upper oil chamber with a lower oil chamber with the upper sliding block (8), so that pressure difference cannot be generated when the upper sliding block (8) and the upper inner sleeve (2) move axially relative to each other, the step of the upper sliding block (8) is used for placing an upper spring (5), the upper sliding block (8), the upper inner sleeve (2) and the upper locking sleeve (3) are in clearance fit, a plurality of small circular grooves are formed in the outer portion of the lower end of the upper sliding block (8), the diameter of the small circular grooves is consistent with that of the steel ball (10), and the small circular grooves are used for supporting the steel ball (10) when the device is in an unlocking state;
the upper spring (5) is arranged on the outer circle of the cylinder body of the upper inner sleeve (2) and has a certain gap with the outer wall of the upper inner sleeve (2); the upper limiting nut (9) is used for limiting the upper sliding block (8), the supporting ring (4) is arranged at an annular groove in the outer wall of the locking sleeve (3) and is used for radially supporting the locking sleeve (3), and the sealing ring (6) is arranged at an annular groove in the outer wall of the locking sleeve (3) and is used for sealing the locking sleeve (3), the end cover (1) and the locking sleeve (3) and the first section of sleeve (23);
the upper air pipe (26) is fixedly connected with the end cover (1) and is provided with a sealing ring seal, the lower air pipe (27) slides up and down on the outer surface of the upper air pipe (26), the lower end of the lower air pipe (27) is provided with a boss, the lower inner sleeve (14) pushes the lower air pipe (27) to slide down through the boss in the locking process, and the sealing ring seal is arranged between the upper air pipe (26) and the lower air pipe (27); when the device is unfolded and unlocked, air/oil is fed from the right end of the end cover (1) and air/oil is discharged from the left end; when the device is unlocked and contracted, air/oil is fed from the left end of the end cover (1), and air/oil is discharged from the right end;
the inner sleeve contact ring (13) is fixedly connected with the lower inner sleeve (14) through screws, and in the unlocking process, the third section of sleeve (25) is pushed to unlock the second section of sleeve (24) after being unlocked, namely, force is transferred through the contact between the inner sleeve contact ring (13) and the upper inner sleeve (2), so that the second section of sleeve (24) is pushed to unlock;
the tertiary ram further comprises: the lower end of the lower locking sleeve (16) is provided with a circle of circumferential internal threads, and the lower locking sleeve (16) is matched with the external threads on the excircle at the upper end of the third section sleeve (25) through the internal threads to ensure that the lower locking sleeve and the third section sleeve are fixedly connected;
the tertiary actuator cylinder further comprises: and the motion conversion rods (33, 35) convert the downward motion of the upper annular touch sheet into the rightward motion of the motion conversion rods, further trigger the button switches (34, 36), and the button switches (34, 36) transmit sleeve in-place locking signals outwards through the wires.
2. An end admission/exhaust three-stage actuator cylinder as claimed in claim 1 in which the inner wall of the locking sleeve (3) is provided with two steps, the upper step providing space for the upper spring (5) and the lower step limiting the position of the upper slide (8).
3. The three-stage actuator cylinder with air inlet and outlet at the end part as claimed in claim 1, wherein the locking sleeve (3) is annularly provided with a plurality of through holes for holding the steel balls (10) and a plurality of threaded through holes, and the locking screw fixedly connects the locking sleeve (3) and the second sleeve (24) through the threaded through holes and the through holes radially distributed at the upper end of the second sleeve (24).
4. An end admission/exhaust three stage actuator cylinder as claimed in claim 1 in which the upper end of the lock sleeve (3) has a plurality of lightening holes arranged circumferentially to provide no pressure difference between the upper and lower air/oil chambers of the upper inner sleeve (2) during relative axial movement between the lock sleeve (3) and the upper inner sleeve (2).
5. An end admission/exhaust three stage ram according to claim 1 wherein the upper (26) and lower (27) air tubes allow the deployment/retraction of the admission/exhaust ports at the end cap (1) without additional space requirement to facilitate the deployment of external drive systems and air/hydraulic lines.
6. An end admission/exhaust three stage actuator cylinder according to claim 1 in which the upper end of the second (24) and third (25) section sleeves are circumferentially perforated with a plurality of symmetrically distributed apertures for air/fluid communication.
7. A method of operating an end bleed/exhaust three stage ram as claimed in any one of claims 1 to 6 including the steps of:
when the landing support leg is unfolded, starting an air/hydraulic system, filling air/liquid into the right side of the upper end of the end cover, pushing the upper inner sleeve to move downwards, namely driving the second section of sleeve, the third section of sleeve and the two-stage steel ball lock mechanism to move downwards completely until the first steel ball slides into the groove in the inner wall of the first section of sleeve, and completing locking of the first-stage steel ball lock until the first section of sleeve and the second section of sleeve are locked; then the gas/hydraulic pressure continues to push the inner sleeve contact ring to move downwards, namely, the third section of sleeve and the second-stage steel ball lock mechanism are driven to move downwards until the second steel ball slides into the groove in the inner wall of the second section of sleeve, and the second-stage steel ball lock completes locking until the first section of sleeve, the second section of sleeve and the third section of sleeve are locked; at the moment, the whole mechanism is unfolded and locked;
when the landing support leg is contracted, starting an air/hydraulic system, filling air/liquid into the left side of the upper end of the end cover, pushing the lower sliding block, the lower limiting nut, the lower inner sleeve and the inner sleeve to contact the ring and move upwards, so that the second steel ball falls off from the groove of the second section of sleeve, and the second-stage steel ball lock mechanism completes unlocking, namely the second section of sleeve and the third section of sleeve are unlocked; then the second-stage steel ball lock mechanism and the third section of sleeve move upwards together until the inner sleeve contact ring touches the upper inner sleeve, so that force is transmitted upwards, the upper sliding block, the upper limiting nut and the upper inner sleeve are pushed to move upwards, the first steel ball falls off from the groove of the first section of sleeve, and the first-stage steel ball lock mechanism completes unlocking, namely the first section of sleeve and the second section of sleeve are unlocked; at this point, the tertiary ram is fully unlocked and eventually moves to a fully retracted state under the continued pneumatic/hydraulic action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910422678.1A CN110282159B (en) | 2019-05-21 | 2019-05-21 | Three-stage actuator cylinder with air/liquid inlet and outlet at end part and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910422678.1A CN110282159B (en) | 2019-05-21 | 2019-05-21 | Three-stage actuator cylinder with air/liquid inlet and outlet at end part and working method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110282159A CN110282159A (en) | 2019-09-27 |
| CN110282159B true CN110282159B (en) | 2022-05-03 |
Family
ID=68002014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910422678.1A Active CN110282159B (en) | 2019-05-21 | 2019-05-21 | Three-stage actuator cylinder with air/liquid inlet and outlet at end part and working method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110282159B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112504031A (en) * | 2020-11-27 | 2021-03-16 | 北京宇航系统工程研究所 | Variable-force-line long-stroke actuating device suitable for rotary throwing of fairing |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3664463A (en) * | 1970-11-10 | 1972-05-23 | Martin Marietta Corp | Deployable shock absorber |
| CN102537618B (en) * | 2011-12-14 | 2013-07-24 | 北京航空航天大学 | Self-unlocking sleeve device capable of being unfolded and folded |
| CN102420372B (en) * | 2011-12-29 | 2013-10-23 | 杭州航天电子技术有限公司 | Secondary unlocking separation mechanism for electric connector |
| CN103935525B (en) * | 2014-04-24 | 2016-01-20 | 南京航空航天大学 | The buffering landing leg of Control System for Reusable Launch Vehicle and way to play for time thereof |
| CN106494651A (en) * | 2016-11-21 | 2017-03-15 | 上海航天控制技术研究所 | A kind of non-firer's separator of low impact |
-
2019
- 2019-05-21 CN CN201910422678.1A patent/CN110282159B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110282159A (en) | 2019-09-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103466081A (en) | Electromechanical actuator damping arrangement for ram air turbine | |
| US20150232195A1 (en) | Ram air turbine actuator | |
| US5184465A (en) | Landing gear drag strut actuator having self-contained pressure charge for emergency use | |
| EP1295702A3 (en) | Tire building drum having independently expandable center and end sections | |
| CN110282159B (en) | Three-stage actuator cylinder with air/liquid inlet and outlet at end part and working method thereof | |
| CN109764025B (en) | Carrier rocket and multistage pneumatic support cylinder for recycling carrier rocket | |
| CN103910059B (en) | One can carry pressurized strut | |
| CN106347639A (en) | Electric multistage actuating cylinder retracting and releasing locking device | |
| CN106275392B (en) | A kind of multistage pressurized strut locking device | |
| US9481453B2 (en) | Shrinking system for landing gear | |
| CN110671977A (en) | Reusable carrier rocket landing buffering device | |
| US10533585B2 (en) | Telescopic device and method for operating a telescopic device | |
| US2360535A (en) | Hydraulic locking mechanism | |
| CN112158363B (en) | Carrier vertical recovery landing system, carrier and unfolding method | |
| CN211527213U (en) | Reusable carrier rocket landing buffering device | |
| CN109268342B (en) | Actuator cylinder with two-end steel ball mechanical lock | |
| WO2011124123A1 (en) | Composite oil cylinder and refuse compactor | |
| US2808810A (en) | Locking mechanism for retractable aircraft landing gear | |
| CN114876911A (en) | Three-stage synchronous telescopic hydraulic oil cylinder | |
| US2809721A (en) | Telescopic struts | |
| CN211001920U (en) | Multistage pneumatic telescopic machanism that can repeatedly lock and separate | |
| CN108032997B (en) | Lock mechanism | |
| CN211259205U (en) | Multi-stage tool cylinder and lifting equipment | |
| CN209892546U (en) | Multi-stage pneumatic support cylinder for recovering carrier rocket | |
| CN108423199B (en) | Gunpowder actuator cylinder type interstage cabin |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |