CN112576574B - Multi-stage wheel release actuator cylinder - Google Patents
Multi-stage wheel release actuator cylinder Download PDFInfo
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- CN112576574B CN112576574B CN202011438996.6A CN202011438996A CN112576574B CN 112576574 B CN112576574 B CN 112576574B CN 202011438996 A CN202011438996 A CN 202011438996A CN 112576574 B CN112576574 B CN 112576574B
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- 230000033001 locomotion Effects 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 230000007246 mechanism Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 5
- 230000001133 acceleration Effects 0.000 claims 1
- 238000007789 sealing Methods 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
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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
- F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic 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
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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
- F15B15/1428—Cylinders
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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
- F15B15/1433—End caps
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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
- F15B15/1457—Piston rods
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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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/26—Locking mechanisms
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The multistage wheel action release actuator disclosed by the invention has a long acting distance, and can sequentially complete multistage sequential release according to a specified sequence. The invention is realized by the following technical scheme: the piston rod is in threaded connection with the lug and the baffle ring of the tail connecting rod assembly, the outer cylinder of the actuating cylinder and the fixed end of at least two stages of telescopic hydraulic cylinders arranged in the outer cylinder of the actuating cylinder, and the locking groove on the tail cylinder locks the piston rod and the same stage of telescopic hydraulic cylinder together, so that the two stages of telescopic hydraulic cylinders, the three stages of telescopic hydraulic cylinders and the piston rod can extend out along the wall of the outer cylinder of the actuating cylinder together; when the tail connecting rod assembly is subjected to hydraulic pressure or external force of the system and is transmitted to the left end or the right end sliding block, pressure oil enters the rod cavity of the piston rod from the oil port on the left side of the end cover, oil pressure acts on the end face of the piston, the piston is forced to move leftwards or rightwards according to the oil inlet direction, and after the piston moves to reach the left or right limit position, the telescopic hydraulic cylinders of all stages are driven to accelerate to extend or retract step by step in order from small to large.
Description
Technical Field
The invention relates to a power conversion device, belongs to the technical field of hydraulic pressure, and can be integrated in a hydraulic mechanical structure such as an actuator cylinder.
Background
The present mechanical structure, such as an actuator cylinder, is widely used in various industries as a linear reciprocating motion executing element. The actuator cylinder is a hydraulic actuator element which is an energy conversion device for converting input hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). When the landing gear is used for realizing reciprocating motion, a speed reducing device can be omitted, a transmission gap is avoided, the motion is stable, and the output force of the hydraulic cylinder is in direct proportion to the effective area of the piston and the pressure difference on two sides of the piston; the hydraulic cylinder basically consists of a cylinder barrel, a cylinder cover, a piston rod, a sealing device, a buffer device and an exhaust device. The actuator cylinder can conveniently perform linear reciprocating motion or can perform reciprocating swing in a certain rule. The actuating cylinder can conveniently obtain great thrust, overcomes external load, and can conveniently obtain various speeds by matching with other elements. When the pressure oil enters the cylinder to drive the moving part to move outwards, but the pressure oil must move by other external force or dead weight when the pressure oil is reversely retracted, the pressure oil must be used in pairs. The cylinder can be divided into a telescopic cylinder or a swinging cylinder, the telescopic cylinder is provided with two or more stages of pistons, the order of the pistons in the telescopic cylinder extends from large to small, and the order of idle load retraction is generally from small to large. The telescopic cylinder can realize a longer stroke and has a shorter length when retracted. Such cylinders are commonly used in construction and agricultural machines. The oscillating hydraulic cylinder is an actuator that outputs torque and performs reciprocating motion, also called an oscillating hydraulic motor. There are two forms of single blade and double blade. The stator block is fixed to the cylinder and the blades and rotor are connected together. According to the oil inlet direction, the blades drive the rotor to do reciprocating swing. The piston with simple single action can only move in one direction under the action of hydraulic pressure, and then returns under the action of a spring. Pressure oil enters from the left oil port, oil pressure acts on the end face of the piston, and the piston is forced to move rightwards; when the piston moves, air in the right spring chamber is discharged through the ventilation small hole, and the spring is pressed; when the oil pressure acting on the piston releases the pressure and is less than the tension of the compression spring, the spring stretches and pushes the piston to move leftwards; because of the left movement of the piston, left Bian Qiangshi oil is forced out of the oil port, while air enters the spring chamber through the vent. The two-way single-rod type actuating cylinder is also called as a two-way unbalanced actuating cylinder, the effective areas (namely the effective working areas) of the left side and the right side of the piston under the hydraulic action are unequal, and when the oil pressure is equal, the transmission force generated by the actuating cylinder along the two directions is unequal. And when the input flow rates at the two ends of the actuator cylinder are the same, the reciprocating movement speeds of the pistons are different, and the extending speed of the pistons is smaller than the retracting speed of the pistons. The bidirectional actuating cylinder can make reciprocating motion by utilizing the oil liquid pushing component. When high-pressure oil enters the actuating cylinder from the left pipeline, the piston moves rightwards under the action of hydraulic pressure, and the oil in the right cavity of the actuating cylinder flows back to the oil tank from the right pipeline; if high-pressure oil enters the actuator cylinder from the right pipeline, the movement direction of the piston with the rod is opposite to that described above. Bidirectional single-rod rams are commonly used where different drive forces are required in two directions. Such forms of rams are commonly employed, for example, in landing gear retraction systems. The sequential control is an open loop control mode for controlling in time sequence or logic sequence, and at present, although parts such as a piston rod and a telescopic hydraulic cylinder in the actuating cylinder can be extended, the actuating cylinder has short acting distance and is easily limited by the change of production working conditions, and the release sequence cannot be ensured.
Disclosure of Invention
The invention aims to solve the technical problem that the prior art cannot be sequentially released when a complex mechanical structure such as an actuator cylinder stretches out. The actuating cylinder with the long acting distance is simple, compact and reliable in structure, convenient to install and capable of sequentially completing multistage sequential release according to a specified sequence, and the problem that the actuating cylinder cannot sequentially release when a complex mechanical structure such as the actuating cylinder stretches out is solved.
In order to solve the technical problems, the technical scheme adopted by the invention comprises the following steps: a multi-stage wheel release actuator comprising: the cylinder comprises a secondary telescopic hydraulic cylinder 2, a tertiary telescopic hydraulic cylinder 3 and a piston rod 4 which linearly moves in the innermost telescopic hydraulic cylinder, which are coaxially assembled in the cylinder body of the cylinder outer cylinder 1 according to the order from small to large and the order of the diameters, and an end cover 6 which is in threaded connection with the fixed end of the cylinder outer cylinder 1, and is characterized in that: a solid cylinder piston 9 which reciprocates in the rod cavity is assembled in the hollow piston rod 4, one end of the piston rod 4 is connected with the lug of the tail rod assembly 5 in a threaded manner, the other end of the piston rod is connected with the baffle ring 10 in a threaded manner, and the piston rod 4 and each stage of telescopic hydraulic sealing are carried out on the fixed ends; the fixed ends of the outer cylinder 1 of the actuating cylinder and at least two stages of telescopic hydraulic cylinders arranged in the outer cylinder are respectively provided with a sliding block 7 which is radially locked in a locking groove, and the locking groove on the tail cylinder locks the piston rod 4 and the telescopic hydraulic cylinder at the same level together, so that the two stages of telescopic hydraulic cylinders 2, the three stages of telescopic hydraulic cylinders 3 and the piston rod 4 can extend out along the cylinder wall of the outer cylinder 1 of the actuating cylinder together; when the tail connecting rod assembly 5 is subjected to hydraulic pressure or external force of a system and is transmitted to the sliding blocks at the left end or the right end, pressure oil enters the rod cavity of the piston rod 4 from the oil through hole at the left side of the end cover 6, oil pressure acts on the end face of the piston 9, the piston 9 is forced to move leftwards or rightwards according to the oil inlet direction, and after the piston moves to reach the left or right limit position, all stages of telescopic hydraulic cylinders are driven to rotate step by step to accelerate to extend or retract in order from small to large.
The invention has the following beneficial effects
The invention is coaxially assembled in the cylinder body of the cylinder outer cylinder 1 of the actuator cylinder from small to large in diameter, the two-stage telescopic hydraulic cylinder 2, the three-stage telescopic hydraulic cylinder 3 and the piston rod 4 which moves linearly in the innermost telescopic hydraulic cylinder can be integrated in other mechanical products or hydraulic systems, one end of the piston rod 4 is screwed on the lug of the tail rod assembly 5, the other end is screwed with the baffle ring 10, the cylinder outer cylinder 1 of the actuator cylinder is screwed with the end cover 6, and the piston rod 4 and each stage of telescopic hydraulic seal is fixed on the fixed end; the invention has the advantages that the structure is simple and compact, the processing is easy, the installation is convenient, the cost is low, the structure is reliable, the locking can be effectively realized, the multistage mechanism can be stretched out step by step and locked according to the sequence from the big inner diameter to the small inner diameter through the design of the mechanical structure and the locking structure, the acting distance is long, the problem that the stretching sequence can not be controlled when the like product stretches out at present is effectively solved, the free end and the tail cylinder of at least two stages of telescopic hydraulic cylinders arranged in the cylinder barrel 1 are respectively provided with a sliding block locked in a locking groove, and the piston rod 4 and the same stage of telescopic hydraulic cylinders are locked together by the locking grooves, so that the cylinder barrel 1, the second stage of telescopic hydraulic cylinder 2 and the third stage of telescopic hydraulic cylinder 3 can stretch out together; when the tail rod assembly 5 is subjected to hydraulic pressure or external force of a system and is transmitted to a left end or a right end sliding block, pressure oil enters a rod cavity of the piston rod 4 from an oil port on the left side of the end cover 6, oil pressure acts on the end face of the piston 9, the piston 9 is forced to move leftwards or rightwards according to the oil inlet direction, if left, the piston 9 moves to the left end face inside the piston rod 4, and after the piston reaches a piston movement limit position, all stages of telescopic hydraulic cylinders are driven to accelerate step by step and stretch out in a sequence from small to large; if the piston moves to the right, the piston moves to the left end face of the baffle ring 10, and after the piston reaches the limit position of movement, the telescopic hydraulic cylinders of all stages are driven to accelerate and retract step by step in the sequence from large to small, so that the whole multi-stage sequential release and retraction process is completed. The multistage wheel action release actuator cylinder is reliable in structure and can be effectively locked, and the problem that complex mechanical structures such as the actuator cylinder cannot be released sequentially when extending is solved.
The invention can be widely applied to various industries, and is a multi-stage wheel action release actuator mechanism which is commonly used for enabling heavy objects with large mass to do high-speed reciprocating motion.
Drawings
FIG. 1 is a cross-sectional view of a multi-stage wheel action release actuator of the present invention;
FIG. 2 is a schematic illustration of the exterior of FIG. 1;
FIG. 3 is a cross-sectional view of the first stage release extension of FIG. 1;
FIG. 4 is a cross-sectional view of the second stage release extension of FIG. 1;
fig. 5 is a sectional view of the multistage sequential release fully extended state of fig. 1.
In the figure: the hydraulic cylinder comprises an outer cylinder of a working cylinder 1, a two-stage telescopic hydraulic cylinder 2, a three-stage telescopic hydraulic cylinder 3, a piston rod 4, a tail connecting rod assembly 5, an end cover 6, a first sliding block 7, a second sliding block 8, a piston 9 and a blocking ring 10.
The invention will be further described with reference to the drawings and examples, without thereby restricting the invention to the scope of the examples. All such concepts should be considered as being generic to the disclosure herein and to the scope of the invention.
Detailed Description
See fig. 1 and 2. In a preferred embodiment described below, a multi-stage wheel action release actuator comprises: the cylinder comprises a secondary telescopic hydraulic cylinder 2, a tertiary telescopic hydraulic cylinder 3 and a piston rod 4 which linearly moves in the innermost telescopic hydraulic cylinder, which are coaxially assembled in the cylinder body of the cylinder outer cylinder 1 according to the order from small to large and the order of the diameters, and an end cover 6 which is in threaded connection with the fixed end of the cylinder outer cylinder 1, and is characterized in that: a solid cylinder piston 9 which reciprocates in the rod cavity is assembled in the hollow piston rod 4, one end of the piston rod 4 is connected with the lug of the tail rod assembly 5 in a threaded manner, the other end of the piston rod is connected with the baffle ring 10 in a threaded manner, and the piston rod 4 and each stage of telescopic hydraulic sealing are carried out on the fixed ends; the fixed ends of the outer cylinder 1 of the actuating cylinder and at least two stages of telescopic hydraulic cylinders arranged in the outer cylinder are respectively provided with a sliding block 7 which is radially locked in a locking groove, and the locking groove on the tail cylinder locks the piston rod 4 and the telescopic hydraulic cylinder at the same level together, so that the two stages of telescopic hydraulic cylinders 2, the three stages of telescopic hydraulic cylinders 3 and the piston rod 4 can extend out along the cylinder wall of the outer cylinder 1 of the actuating cylinder together; when the tail connecting rod assembly 5 is subjected to hydraulic pressure or external force of a system and is transmitted to the sliding blocks at the left end or the right end, pressure oil enters the rod cavity of the piston rod 4 from the oil through hole at the left side of the end cover 6, oil pressure acts on the end face of the piston 9, the piston 9 is forced to move leftwards or rightwards according to the oil inlet direction, and after the piston moves to reach the left or right limit position, all stages of telescopic hydraulic cylinders are driven to accelerate to extend or retract step by step in sequence from small to large.
The fixed end free end of each stage of telescopic hydraulic cylinder and the circumference of the piston rod 4 are provided with guide sealing rings.
The actuating cylinder outer cylinder 1, the secondary telescopic hydraulic cylinder 2 and the tertiary telescopic hydraulic cylinder 3 are cylinders with hollow cavities, and both ends of the cylinders are open ends. The two-stage telescopic hydraulic cylinder 2 and the three-stage telescopic hydraulic cylinder 3 are similar in structure, but the thickness and the diameter of the two sides are different, and locking grooves for locking the first sliding block 7 and the second sliding block 8 are respectively arranged on the two sides. The second-stage telescopic hydraulic cylinder 2 is positioned at the inner side of the outer cylinder 1 of the actuating cylinder and is locked by the first sliding block 7, the third-stage telescopic hydraulic cylinder 3 is positioned at the inner side of the second-stage telescopic hydraulic cylinder 2 and is locked by the second sliding block 8, the piston rod 4 is arranged in the third-stage telescopic hydraulic cylinder 3, one side of the piston rod is connected with the tail rod assembly 5 through threads, when the mechanism does not extend, as the first sliding block 7 and the second sliding block 8 are arranged in the locking grooves of the second-stage telescopic hydraulic cylinder 2 and the third-stage telescopic hydraulic cylinder 3, the two sides of the solid cylinder of the piston 9 which moves linearly in the piston rod are provided with axial grooves, and the second-stage telescopic hydraulic cylinder 2 and the third-stage telescopic hydraulic cylinder 3 can extend along the inner wall of the outer cylinder 1 of the actuating cylinder under the linear motion effect of the piston 9.
A locking groove is formed in one side of the outer cylinder 1 of the actuating cylinder, when a first sliding block 7 positioned in the second-stage telescopic hydraulic cylinder 2 reaches a first limit position, the first sliding block 7 receives upward component force from the third-stage telescopic hydraulic cylinder 3 and enters the locking groove of the outer cylinder 1 of the actuating cylinder, and the first sliding block 7 locks the second-stage telescopic hydraulic cylinder 2 at the first limit position through mechanical structure limiting; similarly, a locking groove is formed in the other side of the secondary telescopic hydraulic cylinder 2, the second sliding block 8 is fixed in the locking groove of the tertiary telescopic hydraulic cylinder 3, and when reaching the second limit position, the second sliding block 8 receives upward component force from a piston rod and enters the locking groove of the secondary telescopic hydraulic cylinder 2, and the locking function is achieved through mechanical structure limiting.
See fig. 3. In the first stage of the release and extension of the multistage wheel action release actuating cylinder, the system hydraulic pressure enters a pressure cavity formed by the end cover 6 and the baffle ring 10 through a nozzle on the end cover 6, enters a piston rod cavity to push a piston to do linear motion in the piston rod cavity, drives the piston rod to extend until reaching a first motion limit position, the piston rod 4 cannot separate from the end of the three-stage telescopic hydraulic cylinder 3 to independently move towards the necking, the piston rod 4 is linked with the three-stage telescopic hydraulic cylinder 3 to separate from the constraint of the first sliding block 7, the second motion limit is reached, the three-stage telescopic hydraulic cylinder 3 cannot separate from the independent motion of the necking of the two-stage telescopic hydraulic cylinder 2 under the constraint of the first sliding block 7, and the first stage of multistage sequential release is completed. Therefore, in the first stage of multistage sequential release of the mechanism, the tail rod assembly 5, the piston rod 4 and the first sliding block 7 driven by the three-stage telescopic hydraulic cylinder 3 are driven by external force to move outwards together, the actuating cylinder outer cylinder 1 screwed by the end cover 6 is fixed, no relative movement exists during extension, the middle process of the stage can be analogous to the extension process of a common actuating cylinder, after the three-stage telescopic hydraulic cylinder 3 receives upward component force from the first sliding block 7 until reaching a first movement limit position, the three-stage telescopic hydraulic cylinder 3 breaks away from the constraint of the first sliding block 7 and enters into an end-to-throat groove of the actuating cylinder outer cylinder 1, the two-stage telescopic hydraulic cylinder 2 is locked at the extension limit position of the three-stage telescopic hydraulic cylinder 3, the piston rod 4 and the piston 9 are not limited by a mechanical structure, the piston 9 is driven by hydraulic force to move to the left side of the piston rod 4 until reaching the inner left end face of the piston rod 4, and the three-stage telescopic hydraulic cylinder 3 is driven to continue extension, so as to finish the first stage of multistage sequential release.
See fig. 4. After the first stage stretching out the three-stage telescopic hydraulic cylinder 3 is finished, the two-stage telescopic hydraulic cylinder 2 is locked at the locking groove of the outer cylinder 1 of the actuator cylinder by the first sliding block 7 and cannot stretch out. The process of the second stage of the multistage sequential release is as follows: the tail rod assembly 5, the piston rod 4 and the three-stage telescopic hydraulic cylinder 3 are pushed by hydraulic pressure to extend outwards continuously until the three-stage telescopic hydraulic cylinder 3 reaches the movement limit, and the second movement limit position is obtained at the moment; similarly to the first stage, when the three-stage telescopic hydraulic cylinder 3 reaches the limit position, the three-stage telescopic hydraulic cylinder 3 is locked in the second-stage telescopic hydraulic cylinder 2, the second sliding block 8 driving the three-stage telescopic hydraulic cylinder 3 to link the second-stage telescopic hydraulic cylinder 2 is separated from the constraint of the locking groove, the second-stage telescopic hydraulic cylinder 2 is driven to continue to extend, and moves towards the left side direction of the piston rod 4 until reaching the third movement limit, the second sliding block 8 locks the three-stage telescopic hydraulic cylinder 3 in the locking groove of the second-stage telescopic hydraulic cylinder 2, the hydraulic pressure pushes the piston 9 to drive the piston rod 4 and the tail rod assembly 5 to continue to extend outwards, so as to finish the second stage of multi-stage sequential release. At the moment, the outer cylinder 1 of the actuating cylinder, the two-stage telescopic hydraulic cylinder 2 and the three-stage telescopic hydraulic cylinder 3 are respectively locked together by the first slide block 7 of the second slide block 8 and the end cover 6, only the piston rod 4 and the tail rod assembly 5 which are connected together through threads and the piston 9 which moves to the left end face of the piston rod 4 are not limited by machinery, and the piston 9 is pushed by hydraulic pressure to drive the piston rod 4 and the tail rod assembly 5 to continue to extend outwards, so that the second stage of multistage sequential release is completed.
See fig. 5. The third stage of the multistage sequential release is simple in process, and only the piston rod 4, parts connected with the piston rod and the piston 9 positioned in the piston rod 4 can continue to extend outwards until the hydraulic pressure drives the piston 9 to push the piston rod 4 to reach the movement limit position, so that the multistage sequential release process of sequentially extending outwards of the two-stage telescopic hydraulic cylinder 2, the three-stage telescopic hydraulic cylinder 3 and the piston rod 4 is completed. During the whole movement, the piston 9 is located in the piston rod 4, moved by the pressure difference of the two chambers, but always inside the piston rod 4.
In the whole multistage sequential release process, radial and axial movements of the first slide block 7 and the second slide block 8 are limited through the design of a mechanical structure, so that falling off is prevented.
The ram retraction process is the same as the extension process described above, and is not repeated here. If the piston 9 moves leftwards, the piston moves to the left end face of the rod cavity of the piston rod 4, and after reaching the movement limit position of the piston, the telescopic hydraulic cylinders at all levels are driven to accelerate step by step and extend out in the order from small to large; if the piston 9 moves rightwards, the piston moves to the left end face of the baffle ring 10, and after the piston moves to the limit position, the telescopic hydraulic cylinders of all stages are driven to accelerate and retract step by step in the sequence from big to small, so that the whole multi-stage sequential release and retraction process is completed.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention. It should be noted that, what is not explicitly described in the present specification is that those skilled in the art can fully implement the present description and the existing hydraulic technology, and therefore, the description is only briefly omitted.
Claims (6)
1. A multi-stage wheel release actuator comprising: the cylinder is characterized in that the cylinder comprises a secondary telescopic hydraulic cylinder (2), a tertiary telescopic hydraulic cylinder (3) and a piston rod (4) which moves linearly in the innermost telescopic hydraulic cylinder, and an end cover (6) which is screwed with the fixed end of the cylinder outer cylinder (1) in a sequential and coaxial manner from large to small according to the diameter and the order of the number of steps: a solid cylinder piston (9) which reciprocates in the rod cavity is assembled in the hollow piston rod (4), one end of the piston rod (4) is connected to the lug of the tail rod assembly (5) in a threaded manner, the other end of the piston rod is connected to the baffle ring (10) in a threaded manner, and the piston rod (4) and the telescopic hydraulic cylinders at all levels are sealed at the fixed ends; the fixed ends of the actuating cylinder outer cylinder (1) and at least two stages of built-in telescopic hydraulic cylinders are respectively provided with a sliding block which is radially locked in a locking groove, and the locking groove and the sliding block on the tail cylinder lock a piston rod (4) and a same stage of telescopic hydraulic cylinder together, so that the two stages of telescopic hydraulic cylinders (2), the three stages of telescopic hydraulic cylinders (3) and the piston rod (4) extend out along the cylinder wall of the actuating cylinder outer cylinder (1); when pressure oil enters a rod cavity of the piston rod (4) from an oil through port at the left side of the end cover (6) or an oil through port at the left end of the piston rod, the oil pressure acts on the end face of the piston (9), the piston (9) is forced to move leftwards or rightwards according to the oil inlet direction, and after the piston moves to reach a left or right limit position, the telescopic hydraulic cylinders at all levels are driven to extend in a gradual rotation acceleration manner in a gradual rotation manner from big to small or retract in a gradual rotation manner from small to big; a lock groove is formed in the inner circle of one side of the upper outer cylinder (1) of the actuating cylinder, when a first sliding block (7) positioned in the second-stage telescopic hydraulic cylinder (2) reaches a first movement limit position, the first sliding block (7) receives upward component force from the third-stage telescopic hydraulic cylinder (3) and enters the lock groove of the outer cylinder (1) of the actuating cylinder, and the first sliding block (7) locks the second-stage telescopic hydraulic cylinder (2) at the first movement limit position through mechanical structure limit; similarly, a locking groove is formed in the inner circle of the other side of the secondary telescopic hydraulic cylinder (2), a second sliding block (8) is fixed in the locking groove of the tertiary telescopic hydraulic cylinder (3), and when the second movement limit position is reached, the second sliding block (8) receives upward component force from a piston rod and enters the locking groove of the secondary telescopic hydraulic cylinder (2), and the locking function is achieved through mechanical structure limiting; in the first stage of the release and extension of the multi-stage wheel action release actuating cylinder, the hydraulic pressure from the system enters a pressure cavity formed by the end cover (6) and the baffle ring (10) through a nozzle on the end cover (6), enters a piston rod cavity to push a piston to do linear motion in the piston rod cavity to drive the piston rod to extend until reaching a first motion limit position, the second-stage telescopic hydraulic cylinder cannot be separated from the outer cylinder end of the actuating cylinder to independently move towards the necking, the piston rod (4) links the third-stage telescopic hydraulic cylinder (3) to be separated from the constraint of the first sliding block (7) and reach a second motion limit position, the third-stage telescopic hydraulic cylinder (3) cannot be separated from the necking of the second-stage telescopic hydraulic cylinder (2) to independently move under the constraint of the second sliding block (8), completing a first stage of multistage sequential release; in the first stage of multistage sequential release of the mechanism, the tail rod assembly (5), the piston rod (4), the three-stage telescopic hydraulic cylinder (3) and the two-stage telescopic hydraulic cylinder (2) are driven by external force, the first sliding block (7) is driven to move outwards together, the end cover (6) and the actuating cylinder outer cylinder (1) which is screwed by the end cover (6) are fixed, no relative movement exists when the tail rod assembly extends, when the tail rod assembly reaches the first movement limit position, the three-stage telescopic hydraulic cylinder (3) is separated from the constraint of the first sliding block (7) and enters the end direction necking groove of the two-stage telescopic hydraulic cylinder (2), the three-stage telescopic hydraulic cylinder (3), the piston rod (4) and the piston (9) are not limited by a mechanical structure, the piston (9) is driven by hydraulic pressure to move towards the left side of the piston rod (4) until reaching the end face of the left side inside the piston rod (4), and drives the three-stage telescopic hydraulic cylinder (3) to extend continuously, so as to finish the first stage of multistage sequential release; after the first-stage stretching out of the three-stage telescopic hydraulic cylinder (3) is finished, the second-stage telescopic hydraulic cylinder (2) is locked at a locking groove of the outer cylinder (1) of the actuating cylinder by a first sliding block (7), the tail rod assembly (5), the piston rod (4) and the three-stage telescopic hydraulic cylinder (3) can not stretch outwards, and are separated from the end cover (6) to be pushed by hydraulic pressure to stretch outwards continuously until the three-stage telescopic hydraulic cylinder (3) reaches the movement limit of the three-stage telescopic hydraulic cylinder, and the second movement limit position is obtained at the moment; when the three-stage telescopic hydraulic cylinder (3) reaches the limit position, the three-stage telescopic hydraulic cylinder (3) is locked in the two-stage telescopic hydraulic cylinder (2), the second sliding block (8) locks the three-stage telescopic hydraulic cylinder (3) in a locking groove of the two-stage telescopic hydraulic cylinder (2), and the process of the multistage sequential release second stage is as follows: the hydraulic pressure promotes the piston (9) to drive the piston rod (4) and the tail rod assembly (5) to continue to extend outwards, so as to complete the second stage of multistage sequential release.
2. The multi-stage wheel action release actuator of claim 1, wherein: the actuating cylinder outer cylinder (1), the secondary telescopic hydraulic cylinder (2) and the tertiary telescopic hydraulic cylinder (3) are cylinders with hollow cavities, and both ends of the cylinders are open ends.
3. The multi-stage wheel action release actuator of claim 1, wherein: the thickness and the diameter of two sides of the two-stage telescopic hydraulic cylinder (2) and the three-stage telescopic hydraulic cylinder (3) are different, the two-stage telescopic hydraulic cylinder (2) is provided with a locking groove for locking the first sliding block (7), and the three-stage telescopic hydraulic cylinder is provided with a locking groove for locking the second sliding block (8).
4. The multi-stage wheel action release actuator of claim 1, wherein: the second-stage telescopic hydraulic cylinder (2) is located at the inner side of the actuating cylinder outer cylinder (1) and is locked by the first sliding block (7), the third-stage telescopic hydraulic cylinder (3) is located at the inner side of the second-stage telescopic hydraulic cylinder (2) and is locked by the second sliding block (8), the piston rod (4) is arranged in the third-stage telescopic hydraulic cylinder (3), one side of the piston rod is connected with the tail rod assembly (5) through threads, and when the mechanism does not extend, the first sliding block (7) and the second sliding block (8) are arranged in locking grooves of the second-stage telescopic hydraulic cylinder (2) and the third-stage telescopic hydraulic cylinder (3).
5. The multi-stage wheel action release actuator of claim 1, wherein: axial grooves are formed in two sides of a solid cylinder of a piston (9) which moves linearly in a piston rod (4), and a secondary telescopic hydraulic cylinder (2) and a tertiary telescopic hydraulic cylinder (3) extend out along the inner wall of an outer cylinder (1) of the actuating cylinder under the action of linear movement of the piston (9).
6. The multi-stage wheel action release actuator of claim 1, wherein: the piston (9) moves leftwards to the left end face of the rod cavity of the piston rod (4), and after reaching the movement limit position of the piston, the piston drives each stage of telescopic hydraulic cylinders to accelerate step by step and stretch out according to the sequence from large to small; if the piston (9) moves rightwards, the piston moves to the left end face of the baffle ring (10), and after the piston moves to the limit position, the telescopic hydraulic cylinders of all stages are driven to accelerate and retract step by step in the order from small to large, so that the whole multistage sequential release and retraction process is completed.
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| CN118757479B (en) * | 2024-09-06 | 2024-11-15 | 浙江阿凡特液压科技有限公司 | Multistage hydraulic cylinder and installation method thereof |
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| GB1030717A (en) * | 1963-09-17 | 1966-05-25 | Decca Ltd | Improvements in or relating to two-stage fluid pressure operated piston and cylinderassemblies |
| GB2259951B (en) * | 1991-09-24 | 1995-09-06 | Quiri & Cie Usines | Hydraulic jack |
| CN102400975B (en) * | 2011-11-24 | 2013-01-09 | 湖南特力液压有限公司 | Secondary stretching and retracting hydraulic cylinder and hydraulic equipment |
| CN108999837B (en) * | 2018-09-30 | 2024-07-02 | 中国船舶重工集团公司第七一九研究所 | Cylinder body oil inlet double-acting multistage hydraulic cylinder |
| CN209414308U (en) * | 2018-12-28 | 2019-09-20 | 山东弘发兴凯实业股份有限公司 | A kind of light-duty anti-crawl agentdefiection dregs fluid cylinder for car |
| CN210240180U (en) * | 2019-06-03 | 2020-04-03 | 江苏恒立液压股份有限公司 | Multi-stage oil cylinder |
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