CN214092552U - Locking/unlocking device capable of actively controlling full-stroke free movement of actuating cylinder - Google Patents

Abstract

The utility model discloses a locking/unlocking device that can active control actuator cylinder full stroke free motion, it is simple and convenient controllable, the initiative inefficacy realizes full stroke free motion and the initiative resumes to lock. The utility model discloses a following technical scheme realizes: in the reciprocating motion of the piston rod, the mechanical lock provides locking force through a spring sleeve connected with a spring to realize locking or unlocking; when the hydraulic/pneumatic oil circuit system supplies pressure to the actuating cylinder cavity, the piston rod reciprocates to carry out logic cycle locking and unlocking along the mechanical lock → unlocking → piston rod motion → locking → unlocking … piston rod motion. The unlocking pipeline is decompressed, the liquid/gas pressure supply system supplies pressure to the unlocking pipeline, the unlocking push rod moves towards the end face of the spring sleeve to push the spring sleeve to be away from the locking position of the mechanical lock, and the mechanical lock is in an unlocking state, so that the piston rod can freely move in the full stroke of the actuating cylinder without locking; after the pressure of the unlocking pipeline is relieved, the actuating cylinder is recovered to be randomly locked and unlocked in a serial logic circulation stroke.

Description

Locking/unlocking device capable of actively controlling full-stroke free movement of actuating cylinder

Technical Field

The utility model relates to a hydraulic pressure actuates the system, the inside mechanical lock structure in hydraulic pressure and the pneumatic single pole of field, single piston, reciprocating motion pressurized strut. In particular to a locking/unlocking device which can actively control the full stroke free movement of the actuating cylinder.

Background

Along with the retraction and the extension of the landing gear in the taking-off and landing process of the airplane, the locking mechanism can complete locking and positioning so as to ensure safe taking-off and landing. However, in the using process, abrasion is gradually generated in the unlocking and locking processes, and the service life of the lock is seriously influenced. If the lock is in a normal wear range, the lock can keep a normal working state, but once a certain upper wear limit is exceeded, the unlocking axial force of the lock is increased sharply, so that the landing gear is failed to retract. Thus, proper operation of the lock mechanism is directly related to the safety of the aircraft in takeoff and landing. The ram is a typical motion drive unit that is capable of driving the device in a reciprocating motion. On the basis of reciprocating motion of the actuating cylinder with the lock, the actuating cylinder can be locked at a specific position, so that the device stops at a specific position and bears a certain load.

At present, most of actuating cylinders applied to a retraction part of an aircraft hydraulic system are locked by adopting hydraulic/pneumatic actuating cylinders, and mechanical locks of mechanical locking devices are arranged in the actuating cylinders. And a hydraulic lock is additionally arranged outside the actuating cylinder, and the hydraulic lock also plays a role when the mechanical lock fails. Hydraulic cylinder mechanical locking devices can be broadly classified into ball locks, snap locks, collet locks, and friction locks. The steel ball lock consists of steel balls, a lock ring and a conical ring, wherein the conical ring and the conical apex angle of the inclined plane of the lock ring are both 90 degrees and work in cooperation with the shell, the piston rod and the spring of the actuating cylinder. When the piston moves rightwards under the action of hydraulic pressure, the piston drives the piston rod to move rightwards together, when 9-12 steel balls (9-12 steel balls) touch the locking ring, the piston is blocked to stop moving, the piston rod drives the piston rod to move rightwards under the action of oil pressure on the cross section, the steel balls are retracted inwards under the action of the resultant force of the locking ring and the piston, and when the steel balls cross the locking ring, the piston pushes the steel balls to be scattered outwards along the conical ring under the action of spring tension to be locked. When high-pressure oil reversely enters (retracts), the oil force pushes the piston to compress the spring to move left, so that the steel ball is retracted inwards to unlock the lock. The steel ball is in point contact with the contact surface, so that the steel ball is easy to wear.

The clamping ring lock consists of a clamping ring, a conical piston, a spring and a locking groove, wherein the clamping ring is open, when the piston rod is in the retracted position, the clamping ring is limited by the outer cylinder wall to be in a compressed state, and the spring is compressed to enable the conical piston to abut against the clamping ring. When the movable cylinder is put down, the joint is communicated with oil, when the upper joint is closed, the piston rod is pushed out, when the snap ring moves to the position of the lock groove, the diameter of the snap ring expands and is clamped in the lock groove, meanwhile, the conical piston is inserted into the inner ring of the snap ring under the action of the spring and oil pressure, so that the snap ring cannot contract and is locked, and the piston rod is locked at the extreme position of putting down. When the actuating cylinder is used for drawing up the connector to supply oil, and the connector is put down to supply oil, the oil is used for pushing the conical piston compression spring to move inwards and withdraw from the clamping ring, the diameter of the clamping ring is reduced under the action of the flange of the piston rod and the inclined surface of the locking groove, the clamping ring is separated from the locking groove to unlock, and the piston rod of the actuating cylinder is drawn up (namely moved leftwards). The snap ring lock is characterized by large contact area, stable force receiving and large bearing force (generally used for an actuating cylinder bearing larger external force).

The collet chuck of the collet chuck lock is an integral steel cylinder with a bulge D at the cylinder end, 16 grooves are cut along the axial direction, and the collet chuck can be opened in the locking process. The piston rod is provided with a boss E and a bevel A, C. And (3) locking: when the piston rod is pushed to move to the right to be in contact with the collet chuck, the collet chuck is opened along the inclined surface A and slides the upper boss E, the piston moves leftwards for a certain distance under the action of the end surface of the collet chuck, the collet chuck is automatically closed after the flange D of the collet chuck falls into the inclined surface C, the piston moves rightwards under the action of the spring to return to the original position and is pressed on the collet chuck, and the piston rod is locked. Unlocking process: when high-pressure oil enters from the right, the piston moves leftwards firstly, the piston rod is pulled out of the collet chuck, the lock is opened, large lateral load can be borne, the movable clearance of the lock is smaller than that of a steel ball lock, and the lock is mainly used for a force bearing actuating cylinder of a heavy airplane.

The piston rod of the friction lock is provided with 8-12 inclined plane grooves, each groove is embedded with a steel ball and blocked by a spring piece, and the piston between the two inclined planes can move in a certain gap. When the piston rod stays at any position and has no hydraulic action, under the action of external force, if the piston rod has a left movement trend, the steel ball on the left side is clamped with the cylinder wall, otherwise, the steel ball on the right side is clamped with the cylinder wall, and therefore the piston is in a locking state. When oil comes from the left side of the piston, the piston is pushed to move to the right by hydraulic pressure, the piston rod jacks the steel ball on the right side, so that the steel ball slides down along the groove and is separated from the cylinder wall, and the steel ball on the left side automatically slides down along the groove while the piston rod moves to the right, namely the unlocking state is realized. The friction lock is designed on the chute, and the inclination ensures that the steel ball can automatically slide down and can be clamped with the wall of the chute. Meanwhile, the sliding range of the steel ball is not suitable to be too large, otherwise, the locking is invalid. The friction lock has a simple structure, can be self-locked at any position, can only bear smaller external load, and otherwise can abrade the cylinder wall.

The 4 kinds of mechanical locks are common airplane hydraulic actuator cylinder mechanical lock devices, and after being locked, the locks are not required to be automatically unlocked.

The mechanical lock mostly adopts a form of 'floating piston + steel ball', when the mechanical lock is in the upper locking state, the position of the steel ball is limited by the armature, and the piston is limited by the steel ball and cannot be ejected, so that the upper locking is realized. When the unlocking is carried out, the electromagnet is electrified to suck the armature, the steel ball is loosened, and the piston is popped up. Similarly, the lower locking is achieved by a spring, a floating piston sink and a steel ball. The disadvantage of this locking technique is that the locking force is small; the required unlocking force is large; the steel ball and the armature are easy to be stuck, and the reliability is not high.

Therefore, the working principle of the mechanical lock inside the actuating cylinder is generally as follows: the system oil (gas) circuit supplies pressure to a cavity of the actuating cylinder, and the pressure acts on the moving piston to drive the piston rod to move. When the piston rod moves to a specific position (generally an extension/retraction limit position), the mechanical lock inside the actuator cylinder is triggered to be locked, so that the piston rod cannot move continuously, and the actuator cylinder is locked. When the movement is to be restarted, pressure must be supplied through a system oil (gas) path to unlock the internal lock, and the piston rod can start to move. According to the above working principle, the logical relationship between the locking and unlocking of the mechanical lock inside the actuator cylinder and the reciprocating motion of the piston rod is a cyclic series, i.e., piston rod motion → mechanical lock locking → mechanical lock unlocking → piston rod motion → mechanical lock locking → … …. This is both a feature and advantage of the lock actuator, as the mechanical lock actuator is not free to move over full travel, but becomes a limitation and disadvantage of the lock actuator as the demand for fine control by the system increases. However, if the ram is used directly without an internal mechanical lock to meet the full stroke free motion, it is not possible to lock the ram in a particular position and take the load. Therefore, how to design a new actuator cylinder which not only has the locking function of the actuator cylinder with a lock, but also can freely move in the full stroke becomes a problem to be solved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at taking the lock pressurized strut to need the problem at full stroke free motion, provide one kind simple and convenient, controllable, circulated, no number of times restriction, can initiatively become invalid and initiatively resume the operation, can make the inside mechanical lock of taking the lock pressurized strut can initiatively become invalid as required, let take the lock pressurized strut to be in no lock state, thereby can be at full stroke free motion, also can initiatively resume as required simultaneously, let take the lock pressurized strut to resume and take the lock state, thereby can be in the locking of particular position, can initiatively, the inside mechanical lock of flexible control hydraulic pressure pressurized strut became invalid's release mechanism.

The utility model provides a technical scheme that technical problem adopted is: a locking/unlocking device capable of actively controlling the full-stroke free movement of an actuating cylinder comprises: the actuating cylinder is internally provided with a hollow piston rod which reciprocates, a hollow piston which is integrally connected with the hollow piston rod, springs 6 which are restrained at two ends of a cavity of the hollow piston and limited in degree of freedom by a spring sleeve 5 and an opposite-end step spring seat, a mechanical lock 4 which is assembled on the circumference of the free end of the piston, and an end cover 3 which is sealed at the tail end of the actuating cylinder through a circumferential bolt, and the actuating cylinder is characterized in that: the bottom of the end cover 3 is provided with a second-order stepped hole cover cavity matched with the locking barrel cover 1 through threads, an unlocking pipeline 7 communicated with the stepped hole cover cavity, and an unlocking push rod 2 assembled in the stepped hole cover cavity and capable of freely moving; in the reciprocating motion of the piston rod, the mechanical lock 4 provides locking force through a spring sleeve 5 connected with a spring 6 to realize locking or unlocking; when the hydraulic/pneumatic oil circuit system supplies pressure to the actuator cylinder cavity, the piston rod reciprocates to circularly lock and unlock according to the serial logic of locking of the mechanical lock → unlocking → piston rod movement → locking → unlocking … piston rod movement, at the moment, the unlocking pipeline 7 releases pressure, the unlocking push rod 2 retracts into the cavity of the cover cavity of the lock-resisting cylinder cover 1, and no axial acting force is generated on the spring sleeve 5; when the actuating cylinder with the lock freely moves in the full stroke, the liquid/gas pressure supply system supplies pressure to the unlocking pipeline 7, the unlocking push rod 2 moves towards the end face of the spring sleeve 5 under the action of liquid/gas pressure to push the spring sleeve 5 and push away from the locking position of the mechanical lock 4, so that the mechanical lock 4 is always in an unlocking state, and the piston rod freely moves in the full stroke of the actuating cylinder without locking; after the pressure of the unlocking pipeline 7 is relieved, the unlocking push rod 2 retracts into the cover cavity of the locking cylinder cover 1 under the action of the motion of the hollow piston, the actuating cylinder can reciprocate in the retraction pipeline 8 under the action of pressure or external load by recovering the piston rod, and the serial logic circulation stroke of locking and unlocking can be arbitrarily retracted.

The utility model discloses compare and have following beneficial effect in prior art:

the utility model discloses restrain at cavity both ends of cavity, by spring sleeve 5 and the spring 6 of the restriction degree of freedom of opposite end step spring holder, assemble the mechanical lock 4 on the circumference of free end of piston, through the end cover 3 of circumference bolt seal at the pressurized cylinder tail end, through the second order step hole lid chamber of end cover 3 bottom complex lock cover 1 and the unblock pipeline 7 that communicates this step hole lid chamber, and assemble the unblock push rod of free motion in the step hole lid chamber; the internal mechanical lock with the lock actuator cylinder can be actively disabled and actively recovered to supply pressure to the actuator cylinder cavity through a hydraulic/pneumatic oil circuit system, the reciprocating motion of the piston rod follows the serial logic circular locking and unlocking of the mechanical lock → unlocking → piston rod motion → locking → unlocking … piston rod motion, and the operation is simple, convenient, controllable, recyclable and free of time limitation. The problem that the locking function and the full-stroke free motion of the actuating cylinder with the lock in the prior art cannot coexist is solved.

The utility model discloses an in piston rod reciprocating motion, mechanical lock 4 provides the locking power through spring sleeve 5 that spring 6 links to each other, realizes locking or unblanking, can realize locking the locking flexibility in the specific position.

The operation is simple and controllable. The utility model discloses supply to push down to the actuator cylinder chamber at liquid/atmospheric pressure oil piping system, piston rod reciprocating motion follows mechanical lock and locks → unblock → piston rod motion → lock → unblock … piston rod motion's serial logic circulation locks and unblock, and at this moment, unblock pipeline 7 pressure release, unblock push rod 2 withdraws in the cavity in blocking lock cover 1 lid chamber, does not produce axial effort to spring sleeve 5; the internal mechanical lock with lock ram can be actively disabled and actively restored. The utility model arranges the mechanical lock near the hollow piston in the actuating cylinder with lock, and pushes the spring sleeve 5 to push away the locking position of the mechanical lock 4 by actively supplying pressure to the unlocking pipeline, so that the mechanical lock 4 is always in the unlocking state, and the free movement of the piston rod in the full stroke of the actuating cylinder without locking is realized; the internal mechanical lock can not complete locking, namely, the internal mechanical lock fails actively. The unlocking pipeline is actively decompressed, so that the internal mechanical lock can be locked, namely, the locking is actively recovered. Control through the unblock pipeline, only need supply to the unblock pipeline and press or the pressure release can accomplish whole functions to can change each item parameter (such as pressure, flow, velocity of flow etc.) of the energy of supplying at any time as required, consequently have easy and simple to handle, controllable characteristics.

The operation can be circulated without limitation. The utility model discloses after 7 pressure releases in unblock pipeline, unblock push rod 2 contracts under the cavity piston motion and contracts to blocking 1 lid intracavity of lock cover, does not produce axial effort to spring sleeve 5, resumes the piston rod under pressure or external load effect, and the actuator cylinder can receive and release in pipeline 8 reciprocating motion, receive wantonly to lock and in the serial logic circulation stroke of unblock. When the unlocking pipeline 7 is decompressed, the unlocking push rod 2 is retracted into a cavity of a cover cavity of the lock-resisting cylinder cover 1, the hydraulic (pneumatic) mechanism belongs to a hydraulic (pneumatic) mechanism, a control pipeline of the hydraulic (pneumatic) mechanism is reversible, and the damage or destruction process does not exist, so that the hydraulic (pneumatic) mechanism has the characteristics of being recyclable in operation and free of time limitation.

The utility model discloses a set up the release mechanism near the inside mechanical lock of area lock pressurized strut, when needs area lock pressurized strut is in full stroke free motion, liquid/gas pressure supply system supplies pressure to unblock pipeline 7, unblock push rod 2 is to 5 terminal surface movements of spring sleeve under the effect of liquid/gas pressure, promote spring sleeve 5, push away from the locking position of mechanical lock 4, make mechanical lock 4 be in the unblock state all the time, realize the piston rod in the full stroke free motion of the pressurized strut that does not have the locking; effectively solves the problem of full-stroke free motion of the actuating cylinder with the lock. Test results prove that the internal mechanical lock of the actuating cylinder with the lock can be actively disabled as required, the actuating cylinder with the lock is in a lock-free state and can freely move in a full stroke, and meanwhile, the mechanical lock recovery function can be actively recovered as required, the actuating cylinder with the lock is recovered to be in a lock-containing state after the actuating cylinder does not need to freely move in the full stroke, and the actuating cylinder is locked at a specific position. The operation mode is simple, convenient, controllable, recyclable and free of frequency limitation, and the designed actuator cylinder with the lock can well meet the actual use requirement.

Drawings

Fig. 1 is a schematic partial sectional view of a locking/unlocking device capable of actively controlling the full-stroke free movement of an actuator cylinder according to the present invention;

in the figure: 1 block lock cylinder cover, 2 unlock push rod, 3 end cover, 4 mechanical lock, 5 spring sleeve, 6 spring, 7 unlock pipeline, 8 receive and release pipeline, 9 actuating cylinder, 10 hollow piston rod

The invention is further described with reference to the following figures and examples.

Detailed Description

See fig. 1. In a preferred embodiment described below, a locking/unlocking device capable of actively controlling the free movement of a full stroke of a ram comprises: the actuating cylinder comprises a hollow piston rod which reciprocates in the actuating cylinder, a hollow piston which is integrally connected with the hollow piston rod, springs 6 which are restrained at two ends of a cavity of the hollow piston and limited in degree of freedom by a spring sleeve 5 and a spring seat with a step at the opposite end, a mechanical lock 4 which is assembled on the circumference of the free end of the piston, and an end cover 3 which is sealed at the tail end of the actuating cylinder through a circumferential bolt. The bottom of the end cover 3 is provided with a second-order stepped hole cover cavity matched with the locking barrel cover 1 through threads, an unlocking pipeline 7 communicated with the stepped hole cover cavity, and an unlocking push rod 2 assembled in the stepped hole cover cavity and capable of freely moving; in the reciprocating motion of the piston rod, the mechanical lock 4 provides locking force through a spring sleeve 5 connected with a spring 6 to realize locking or unlocking; when the hydraulic/pneumatic oil circuit system supplies pressure to the actuator cylinder cavity, the piston rod reciprocates to circularly lock and unlock according to the serial logic of locking of the mechanical lock → unlocking → piston rod movement → locking → unlocking … piston rod movement, at the moment, the unlocking pipeline 7 releases pressure, the unlocking push rod 2 retracts into the cavity of the cover cavity of the lock-resisting cylinder cover 1, and no axial acting force is generated on the spring sleeve 5; when the actuating cylinder with the lock freely moves in the full stroke, the liquid/gas pressure supply system supplies pressure to the unlocking pipeline 7, the unlocking push rod 2 moves towards the end face of the spring sleeve 5 under the action of liquid/gas pressure to push the spring sleeve 5 and push away from the locking position of the mechanical lock 4, so that the mechanical lock 4 is always in an unlocking state, and the piston rod freely moves in the full stroke of the actuating cylinder without locking; after the pressure of the unlocking pipeline 7 is relieved, the unlocking push rod 2 retracts into the cover cavity of the locking cylinder cover 1 under the action of the motion of the hollow piston, the actuating cylinder can reciprocate in the retraction pipeline 8 under the action of pressure or external load by recovering the piston rod, and the serial logic circulation stroke of locking and unlocking can be arbitrarily retracted.

Sealing structures sealed by sealing rings are arranged on the circumferences between the end cover 3 and the locking cylinder cover 1 and between the locking cylinder cover 1 and the unlocking push rod 2.

If the unlocking mechanism parts of the unlocking pipeline 7, the locking cylinder cover 1, the unlocking push rod 2 and two sealing structures between the locking cylinder cover 1 and the end cover 3 and between the locking push rod 2 in the figure 1 are removed and solid bodies are used for filling, the general locking actuating cylinder is obtained.

For a common actuating cylinder with a lock, a system controls a piston rod to reciprocate through a retraction pipeline, when the piston rod moves to a locking position, a spring sleeve 5 pushes an internal mechanical lock 4 to the locking position under the action of a spring 6, the mechanical lock 4 is locked, the piston rod cannot move continuously at the moment, the spring force of the spring 6 must be overcome to push the spring sleeve 5 away, the mechanical lock 4 is pushed to an upper locking surface of an inner cavity of the actuating cylinder 9, the mechanical lock 4 is locked, the piston rod cannot move continuously, the spring force of the spring 6 must be overcome to push the spring sleeve 5 away, and after the mechanical lock 4 is unlocked, the piston rod can move continuously.

Increase in the area lock pressurized strut the utility model discloses a behind the release mechanism, an unblock pipeline has additionally been increased outside receiving and releasing the pipeline. When the locking function of the actuating cylinder with the lock needs to be used, the pressure of the unlocking pipeline is relieved, the unlocking push rod 2 can be retracted into the cavity of the lock-resisting cylinder cover 1, no acting force is applied to the spring sleeve 5, the actuating cylinder is the same as the common actuating cylinder with the lock at the moment, and the actuating cylinder can be locked through the internal mechanical lock 4 after the piston rod moves to the locking position.

When the actuating cylinder 9 with the lock needs to move freely in the full stroke, pressure is supplied to the unlocking pipeline, the unlocking push rod 2 moves rightwards for a certain distance under the action of liquid (gas) pressure, then the spring sleeve 5 is pushed away from the upper locking surface of the actuating cylinder 9, and the mechanical lock 4 in the actuating cylinder 9 cannot be locked. Because the internal mechanical lock can not be locked, the actuating cylinder is the same as the actuating cylinder without the internal mechanical lock, and the piston rod can freely move in the full stroke and can not be locked at a specific position.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (7)

1. A locking/unlocking device capable of actively controlling the full-stroke free movement of an actuating cylinder comprises: the actuating cylinder is internally provided with a hollow piston rod which reciprocates, a hollow piston which is integrally connected with the hollow piston rod is constrained at two ends of a cavity of the hollow piston, a spring (6) which limits the degree of freedom by a spring sleeve (5) and an opposite-end step spring seat, a mechanical lock (4) which is assembled on the circumference of the free end of the piston, and an end cover (3) which is sealed at the tail end of the actuating cylinder (9) through a circumferential bolt, and the actuating cylinder is characterized in that: the bottom of the end cover (3) is provided with a second-order stepped hole cover cavity matched with the locking barrel cover (1) through threads, an unlocking pipeline (7) communicated with the stepped hole cover cavity, and an unlocking push rod (2) assembled in the stepped hole cover cavity and capable of moving freely; the mechanical lock (4) provides locking force through a spring sleeve (5) connected with a spring (6) to realize locking or unlocking of the reciprocating motion of the piston rod, and the reciprocating motion of the piston rod under the pressure supplied to the actuating cylinder cavity by a hydraulic/pneumatic oil circuit system follows the serial logic circulation locking and unlocking of the mechanical lock → unlocking → piston rod motion → locking → unlocking … piston rod motion to realize free motion of the piston rod in the full stroke of the actuating cylinder without locking.

2. A locking/unlocking device capable of actively controlling the free movement of the actuator cylinder in the full stroke as claimed in claim 1, wherein: the unlocking pipeline (7) is decompressed, and the unlocking push rod (2) is retracted in a cavity of a cover cavity of the lock-resisting cylinder cover (1) and does not generate axial acting force on the spring sleeve (5).

3. A locking/unlocking device capable of actively controlling the free movement of the actuator cylinder in the full stroke as claimed in claim 1, wherein: in the full-stroke free movement of the actuating cylinder (9) with the lock, the hydraulic/pneumatic pressure supply system supplies pressure to the unlocking pipeline (7), the unlocking push rod (2) moves to the end face of the spring sleeve (5), the spring sleeve (5) is pushed, the locking position of the mechanical lock (4) is pushed away, and the mechanical lock (4) is always in an unlocking state.

4. A locking/unlocking device capable of actively controlling the free movement of the actuator cylinder in the full stroke as claimed in claim 1, wherein: after the pressure of the unlocking pipeline (7) is relieved, the unlocking push rod (2) retracts into the cover cavity of the lock-resisting cylinder cover (1) under the action of the motion of the hollow piston, the piston rod is recovered, and the actuating cylinder (9) reciprocates in the retraction pipeline (8) under the action of pressure or external load.

5. A locking/unlocking device capable of actively controlling the free movement of the actuator cylinder in the full stroke as claimed in claim 1, wherein: sealing structures sealed by sealing rings are arranged on the circumferences between the end cover (3) and the lock blocking cylinder cover (1) and between the lock blocking cylinder cover (1) and the unlocking push rod (2).

6. A locking/unlocking device capable of actively controlling the free movement of the actuator cylinder in the full stroke as claimed in claim 1, wherein: when the piston rod moves to the locking position, the mechanical lock (4) pushes the locking surface on the inner cavity of the actuating cylinder (9), and the mechanical lock (4) is locked.

7. A locking/unlocking device capable of actively controlling the free movement of the actuator cylinder in the full stroke as claimed in claim 1, wherein: when the actuating cylinder (9) moves freely in the full stroke, the unlocking pipeline (7) supplies pressure, the unlocking push rod (2) moves rightwards, the spring sleeve (5) pushes away from the upper locking surface of the actuating cylinder (9), the mechanical lock (4) in the actuating cylinder (9) is locked and loses efficacy, and the piston rod moves freely in the full stroke.

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