CN215621905U - Landing leg locking device and engineering machinery - Google Patents

Abstract

The utility model provides a supporting leg locking device and an engineering machine, wherein the supporting leg locking device comprises a frame and a swinging supporting leg which is rotatably connected to the frame, the swinging supporting leg comprises a swinging arm and a telescopic arm, the swinging arm is rotatably connected with the frame, the telescopic arm can be slidably nested in the swinging arm, the supporting leg locking device also comprises a locking assembly, the locking assembly is connected to the frame or the telescopic arm, and when the swinging supporting leg is in a folded state, the locking assembly prevents the telescopic arm from extending out of the swinging arm. This embodiment is through setting up the locking subassembly on frame or flexible arm, in flexible arm retraction swing arm, and when the swing arm was in the state of drawing in, the locking subassembly can prevent flexible arm and stretch out from the swing arm, this kind of simple structure, convenient operation, and can avoid the operator to stretch out from the swing arm because of unexpected operation or emergency braking makes flexible arm follow the swing arm and collide with the driver's cabin and cause the damage, and then improve the security.

Description

Landing leg locking device and engineering machinery

Technical Field

The utility model relates to the technical field of engineering machinery, in particular to a supporting leg locking device and engineering machinery.

Background

In order to meet the requirements of engineering operation, the engineering machinery is provided with a supporting device, and the supporting device is used for stably supporting the whole machine when the engineering machinery is in an operating state. Wherein strutting arrangement is equipped with the swing landing leg, is equipped with flexible landing leg in the swing landing leg, and in the use, the swing landing leg outwards swings and opens corresponding position, and then flexible landing leg stretches out from the swing landing leg in, and after the use, then control flexible landing leg earlier and withdraw to in the swing landing leg, then control the swing landing leg and return the pendulum to be fixed in the both sides of frame.

Among the prior art, the preceding pendulum landing leg is mostly multistage flexible, in the use, if the operator directly carries out telescopic operation when the landing leg in the front does not fully expand, can make preceding landing leg and driver's cabin collide, causes the problem of the damage of driver's cabin and landing leg.

SUMMERY OF THE UTILITY MODEL

The utility model provides a supporting leg locking device and engineering machinery, which are used for solving the problem that in the prior art, an operator can not fully expand and directly extend a supporting leg to cause damage to a cab and the supporting leg.

The utility model provides a supporting leg locking device which comprises a frame and a swinging supporting leg rotatably connected to the frame, wherein the swinging supporting leg comprises a swinging arm and a telescopic arm, the swinging arm is rotatably connected with the frame, the telescopic arm can be slidably nested in the swinging arm, the supporting leg locking device also comprises a locking assembly, the locking assembly is connected to the frame or the telescopic arm, and the locking assembly prevents the telescopic arm from extending out of the swinging arm when the swinging supporting leg is in a folded state.

According to the supporting leg locking device provided by the utility model, when the swinging arm is unfolded by a preset angle, the swinging supporting leg or the frame is separated from the locking assembly.

According to the supporting leg locking device provided by the utility model, the locking assembly is connected to the frame, the swing arm and the telescopic arm are respectively provided with the limiting holes, and when the telescopic arm retracts into the swing arm, the limiting hole on the swing arm and the limiting hole on the telescopic arm are coaxial; when the swing supporting leg is in a folded state, the locking assembly is sequentially inserted into the limiting holes and used for limiting the telescopic arm to extend forwards.

According to the supporting leg locking device provided by the utility model, the swing arm and the telescopic arm are respectively provided with the limiting holes at one side close to the locking assembly; or the swing arm and the telescopic arm are respectively provided with the limiting holes on two sides correspondingly.

According to the supporting leg locking device provided by the utility model, the locking assembly comprises a limiting pin, and the limiting pin sequentially penetrates through a limiting hole in the swing arm and a limiting hole in the telescopic arm and is used for limiting the telescopic arm to extend out.

According to the supporting leg locking device provided by the utility model, the axis of the limiting pin is vertical to the length direction of the frame.

According to the supporting leg locking device provided by the utility model, one end of the limiting pin, which faces the swing supporting leg, is provided with a gradual change section, and the sectional dimension of the gradual change section is gradually reduced along the direction which faces the swing supporting leg.

According to the supporting leg locking device provided by the utility model, the locking assembly further comprises a supporting seat, the supporting seat is detachably connected to the frame, and the limiting pin is connected to the upper part of the supporting seat.

According to the supporting leg locking device provided by the utility model, the swing arm is provided with a first limiting hole, the locking assembly is connected with the telescopic arm and comprises a limiting pin, the frame is provided with a second limiting hole, and the limiting pin penetrates through the first limiting hole and enters the second limiting hole to limit the telescopic arm to extend forwards when the swing supporting leg is in a folded state.

The utility model also provides engineering machinery comprising any one of the supporting leg locking devices, wherein the frame comprises a fixed rotating tower, the swinging supporting leg is rotatably connected to the fixed rotating tower, and the supporting leg locking device is arranged corresponding to the swinging supporting leg.

According to the supporting leg locking device and the engineering machinery, the locking assembly is arranged on the frame or the telescopic arm, the telescopic arm retracts into the swing arm, and when the swing arm is in a folded state, the locking assembly can prevent the telescopic arm from extending out of the swing arm.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic cross-sectional view of a leg locking device provided by the present invention;

FIG. 2 is one of the schematic structural views of a turret provided by the present invention;

FIG. 3 is a second schematic diagram of the turret structure provided by the present invention;

reference numerals:

1: a frame; 2: a limiting hole; 3: swinging the support legs;

4: a swing arm; 5: a telescopic arm; 6: a spacing pin;

7: a supporting seat; 8: the turret is fixed.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The following describes a leg locking device and a construction machine provided by the utility model with reference to fig. 1 to 3.

The utility model provides a supporting leg locking device which is used for automatically locking a supporting leg in a furled state and automatically unlocking the supporting leg after the supporting leg is unfolded at a certain angle without manual operation.

The embodiment provides a landing leg locking device, including frame 1 and swing landing leg 3 of rotation connection on the frame, swing landing leg 3 includes swing arm 4 and telescopic arm 5, and swing arm 4 rotates with frame 1 to be connected, and telescopic arm 5 can slide and nest in swing arm 4, and landing leg locking device still includes the locking subassembly, and the locking subassembly is connected in frame 1 or telescopic arm 5, and the locking subassembly prevents telescopic arm 5 from stretching out from swing arm 4 when swing landing leg 3 is in the state of drawing in.

Referring to fig. 1, the leg locking device includes a frame 1 and a swing leg 3, and the swing leg 3 is rotatably connected to the frame 1 such that the swing leg 3 can rotate along the frame 1 by a certain angle; specifically, the swing leg 3 comprises a swing arm 4 and a telescopic arm 5, wherein the swing arm 4 is rotatably connected to the frame 1, and the telescopic arm 5 can be slidably nested in the swing arm 4, that is, the telescopic arm 5 can extend and retract in the swing arm 4; further, when the telescopic arm 5 retracts into the swing arm 4, and the outer side wall of the swing arm 4 is flush with the outer side wall of the same side of the frame 1 or is located inside the outer side wall of the same side of the frame 1, or the outer side wall of the swing arm 4 is flush with the outer side wall of the same side of the cab or is located inside the outer side wall of the same side of the cab, that is, the swing leg 3 is in the folded state, as shown in fig. 2.

The landing leg locking means that this embodiment provided still includes the locking subassembly, and the locking subassembly is connected in frame 1 or telescopic boom 5, and when swing landing leg 3 was in the state of drawing in, the locking subassembly was arranged in preventing telescopic boom 5 to stretch out from swing arm 4, avoids swing landing leg 3 and driver's cabin to bump and causes the damage.

The landing leg locking means that this embodiment provided, through set up the locking subassembly on frame or flexible arm, in flexible arm retraction swing arm, and the swing arm is when the folded state, the locking subassembly can prevent flexible arm to stretch out from the swing arm, this kind of simple structure, convenient operation, and can avoid the operator to stretch out from the swing arm because of unexpected operation or emergency braking makes flexible arm follow the swing arm and collide with the driver's cabin and cause the damage, and then improve the security.

Further, referring to fig. 3, when the swing arm 4 is unfolded by a predetermined angle, the swing leg 3 or the frame 1 is separated from the locking assembly. Specifically, the locking assembly is connected to the frame 1, when the swing arm 4 is unfolded outwards for a certain angle, namely the swing leg 3 can avoid a cab, the swing leg 3 is separated from the locking assembly, and a user can extend the telescopic arm 5 out of the swing arm 4 according to requirements; the locking assembly is connected to telescopic arm 5, and swing arm 4 outwards expands certain angle, and when keeping away from the driver's cabin, frame 1 and locking assembly separation.

In a preferred embodiment the swing arm 4 is flared 3-10 deg. out, i.e. 3 deg., 5 deg., 7 deg., 10 deg., etc., to avoid the cab.

In this embodiment, the preset angle for separating the swing leg 3 from the locking assembly by the preset outward expansion angle of the swing arm 4 is not specifically limited, and may be completely expanded or expanded by a certain angle, so that the collision between the swing leg 3 and the cab can be avoided.

On the basis of the above embodiment, the locking assembly is connected to the frame 1, the swing arm 4 and the telescopic arm 5 are respectively provided with the limiting hole 2, and when the telescopic arm 5 retracts into the swing arm 4, the limiting hole 2 on the swing arm 4 and the limiting hole 2 on the telescopic arm 5 are coaxial; when the swing supporting leg 3 is in a folded state, the locking assembly is sequentially inserted into the limiting holes 2 to limit the telescopic arm 5 to extend forwards.

In one embodiment, the swing leg 3 comprises a swing arm 4 and a telescopic arm 5 arranged inside the swing arm 4, wherein the telescopic arm 5 may be multi-stage, i.e. a multi-stage telescopic arm may be retracted into the swing arm 4 or extended from the swing arm 4. Referring to fig. 1 and 3, the swing leg 3 adopts two-stage telescoping, that is, the swing leg 3 includes a swing arm 4, a first-stage telescopic arm and a second-stage telescopic arm, wherein the first-stage telescopic arm and the second-stage telescopic arm are nested in the swing arm 4, when the swing leg 3 is folded, the second-stage telescopic arm is retracted to the inner side of the first-stage telescopic arm, and the first-stage telescopic arm is retracted to the inner side of the swing arm 4; when the swing supporting legs 3 are unfolded outwards for a certain angle, the primary telescopic arm can be extended out of the swing arms 4 according to the requirement, and then the secondary telescopic arm is extended out of the primary telescopic arm; or the extension of the secondary telescopic arm from the primary telescopic arm and the extension of the primary telescopic arm from the swing arm 4 are carried out simultaneously.

Further, the locking subassembly is connected in frame 1, the swing arm 4, first order telescopic boom and second grade telescopic boom are equipped with spacing hole 2 respectively, when first order telescopic boom and second grade telescopic boom retract to swing arm 4 in, spacing hole 2 on swing arm 4, spacing hole 2 on the first order telescopic boom and the central axis coincidence in spacing hole 2 on the second grade telescopic boom, make the locking subassembly can match with a plurality of spacing hole 2, when swing landing leg 3 is in the folded state promptly, the locking subassembly can plant the spacing hole on swing arm 4 and the telescopic boom 5 in proper order, realize the locking, prevent that first order telescopic boom and second grade telescopic boom from stretching out to collide with the driver's cabin and cause the damage.

In this embodiment, the swing leg is not limited, and may be a swing leg that realizes secondary expansion and contraction, or a swing leg that realizes tertiary expansion and contraction, and may be set according to actual requirements.

Compared with an X-shaped supporting leg, the swinging supporting leg in the embodiment does not need to be crossed in the height direction, so that the height of a box body of the swinging supporting leg can be very high, the rigidity of the swinging supporting leg is improved, and the stability of the whole vehicle is improved.

Based on the above embodiment, the swing arm 4 and the telescopic arm 5 are respectively provided with a limiting hole 2 at one side close to the locking assembly; or, the swing arm 4 and the telescopic arm 5 are respectively provided with the limiting holes 2 at two sides correspondingly.

In one embodiment, the locking assembly is connected to the vehicle frame 1, the swing arm 4 and the telescopic arm 5 are respectively provided with a limiting hole 2 at one side close to the locking assembly, when the swing leg 3 is in a folded state, central axes of the limiting holes 2 on the swing arm 4 and the telescopic arm 5 coincide, the locking assembly sequentially penetrates through the limiting hole 2 on the swing arm 4 and the limiting hole 2 on the telescopic arm 5 to be arranged in the innermost telescopic arm 5, so that the telescopic arm 5 is limited, and when the swing leg 3 is in the folded state, the telescopic arm 5 is prevented from being extended to collide with a cab and be damaged.

In a preferred embodiment, the locking assembly is connected to the vehicle frame 1, two sides of the swing arm 4 and two sides of the telescopic arm 5 are provided with limiting holes 2, when the telescopic arm 5 retracts into the swing arm 4, the swing leg 3 is in a folded state, central axes of the limiting holes 2 on two sides of the swing arm 4 and the limiting holes 2 on two sides of the telescopic arm 5 coincide, the locking assembly can sequentially penetrate through a first side of the swing arm 4, a first side of the telescopic arm 5, a second side of the telescopic arm 5 and a second side of the swing arm 4 and then be placed outside the second side of the swing arm 4, limiting of the telescopic arm 5 is achieved, and the telescopic arm 5 is prevented from being extended out to collide with a cab to cause damage. Wherein the first side of the oscillating arm 4 and the first side of the telescopic arm 5 are the sides close to the locking assembly; the second side of the oscillating arm 4 is arranged opposite to the first side of the oscillating arm 4; the second side of the telescopic arm 5 is arranged opposite to the first side of the telescopic arm 5.

Further, the locking subassembly includes spacer pin 6, and spacer pin 6 passes spacing hole 2 on swing arm 4 and the spacing hole 2 on the telescopic arm 5 in proper order for the telescopic arm 5 of restriction stretches out.

Based on above-mentioned embodiment, the locking subassembly is connected in frame 1, and the locking subassembly includes spacer pin 6, and when swing arm 4 and flexible arm 5 were equipped with spacing hole 2 respectively in the one side that is close to the locking subassembly, swing landing leg 3 was in when drawing in the state, and spacing hole 2 on the swing arm 4 and the flexible arm 5 of spacing hole 2 were located the inside of the flexible arm 5 of the most inboard in proper order passed to the one end of spacer pin 6 for the flexible arm 5 of restriction stretches out. For example, when the swing leg 3 is two-stage telescopic, one end of the limit pin 6 passes through the limit hole 2 of the swing arm 4, the limit hole 2 of the first-stage telescopic arm and the limit hole 2 of the second-stage telescopic arm and is arranged in the second-stage telescopic arm, so as to prevent the multi-stage telescopic arm from extending out.

In a preferred embodiment, the locking subassembly is connected to frame 1, the locking subassembly includes spacing pin 6, both sides at swing arm 4 and the both sides of telescopic arm 5 all are equipped with spacing hole 2, when swing leg 3 is in the folded state, spacing hole 2 on the first side of swing arm 4, spacing hole 2 of telescopic arm 5 first side, spacing hole 2 of telescopic arm 5 second side and spacing hole 2 of swing arm 4 second side are placed in the outside of swing arm 4 second side in proper order to the one end of spacing pin 6, realize spacing to telescopic arm 5, prevent that telescopic arm 5 from stretching out and the driver's cabin bumps and appearing the damage.

Furthermore, the axis of the limit pin 6 is perpendicular to the length direction of the frame 1, that is, the axis of the limit pin 6 is perpendicular to the swing leg 3 when the swing leg 3 is in the folded state, which is helpful for the limit pin 6 to be inserted into the limit hole 2 on the swing leg 3 to limit the telescopic arm 5 to extend out of the swing arm 4 to avoid collision with the cab, thereby improving the safety.

Further, the stop pin 6 is equipped with the transition towards the one end of swing landing leg 3, and the cross sectional dimension of transition reduces along the direction towards swing landing leg 3 gradually, helps the one end of stop pin 6 to pass spacing hole 2 on swing arm 4 and the spacing hole 2 on the telescopic boom 5 in proper order, realizes spacing to telescopic boom 5.

On the basis of the above embodiment, the locking assembly further comprises a supporting seat 7, the supporting seat 7 is detachably connected to the frame 1, and the limit pin 6 is connected to the upper portion of the supporting seat 7. Specifically, the bottom of supporting seat 7 can be dismantled and connect in frame 1, and the upper portion of supporting seat 7 is connected with spacer pin 6, and the axis of spacer pin 6 is perpendicular with the length direction of frame 1, and the one end of spacer pin 6 passes spacing hole 2 on the swing landing leg 3 and is located the inside of telescopic boom 5 or is located the outside realization of the second side of swing arm 4 to telescopic boom 5 spacing.

Further, the bottom of the support seat 7 is rectangular, and the area of the upper portion of the support seat 7 is gradually reduced upward.

In a preferred embodiment, the limit pin 6 is plugged in and matched to the lower part of the swing leg 3. Specifically, the bottom of supporting seat 7 can be dismantled and connect in frame 1, and the upper portion of supporting seat 7 is connected with spacer pin 6, and spacer pin 6 corresponds the below position that sets up at swing landing leg 3, can effectively reduce the height of supporting seat 7, makes things convenient for spacer pin 6 to plant spacing hole 2 on the swing landing leg 3, and the reducible interference to other parts on frame 1 in addition.

In this embodiment, the structure of the supporting seat 7 and the arrangement position of the limit pin 6 are not particularly limited, and the telescopic arm 5 can be effectively prevented from being damaged due to collision with the cab.

In one embodiment, a limit pin 6 is installed on the frame 1, and a limit hole 2 is formed in the swing supporting leg 3, so that the swing supporting leg 3 is just clamped on the limit pin 6 when being in a folded state. When the swing supporting leg 3 is not unfolded to a certain angle (i.e. not separated from the limit pin 6), the telescopic arm 5 in the swing supporting leg cannot extend out, so that the cab is protected. If misoperation, do not expand swing landing leg 3 a certain angle, and directly carry out flexible operation, spacer pin 6 can prevent telescopic boom 5 to stretch out and avoid the damage of driver's cabin and swing landing leg 3 itself.

In one embodiment, because the swing arm 4 at the outermost layer only performs the rotation movement and does not stretch, the stress of the limiting pin 6 mainly comes from the shearing action between the swing arm 4 and the telescopic arm 5, and does not suffer from large bending moment, the stress is good, and the performance of the whole support leg is improved.

On the basis of the above embodiment, be equipped with first spacing hole on the swing arm 4, the locking subassembly is connected in telescopic boom 5, and the locking subassembly includes the spacer pin, is equipped with the spacing hole of second on frame 1, and the spacer pin passes first spacing hole and gets into the spacing hole of second and be used for restricting telescopic boom 5 and stretch out forward when swing landing leg 3 is in the state of drawing in.

In a specific embodiment, the swing leg 3 includes a swing arm 4 and a primary telescopic arm, the locking assembly is connected to the primary telescopic arm, the swing arm 4 is provided with a first limiting hole, wherein the first limiting hole may be a long hole, the first limiting hole is arranged along the length direction of the swing arm 4, the locking assembly includes a limiting pin, and the limiting pin passes through the first limiting hole and can move along the first limiting hole; a second limiting hole is correspondingly formed in the frame 1, when the primary telescopic arm retracts into the swing arm 4 and the swing support leg 3 is in a folded state, a limiting pin on the primary telescopic arm penetrates through the first limiting hole in the swing arm 4 and is inserted into the second limiting hole in the frame 1 to limit the primary telescopic arm, and the primary telescopic arm is prevented from extending out of the swing arm 4 and colliding with a cab; when the swing supporting leg 3 is unfolded outwards for a certain angle to avoid a cab, the limiting pin is separated from the second limiting hole in the frame 1, and the limiting pin on the first-stage telescopic arm moves along the first limiting hole in the swing arm 4 and further extends out of the swing arm 4.

In another embodiment, the locking assembly is connected to the telescopic arm 5, the locking assembly includes a limit pin, the limit pin on the telescopic arm 5 is an elastic limit pin, when the telescopic arm 5 retracts into the swing arm 4, and the swing leg 3 is in the folded state, the limit pin pops out to sequentially pass through the first limit hole and the second limit hole to limit the telescopic arm 5; when the swing arm 4 needs to be unfolded outwards for a certain angle to avoid the cab, the limiting pin 6 can be retracted into the swing supporting leg 3 from the second limiting hole and the first limiting hole, and then unlocking is achieved.

The embodiment also provides an engineering machine, which comprises the support leg locking device of any one of the above embodiments, the frame 1 comprises a fixed turret 8, the swing support leg 3 is rotatably connected to the fixed turret 8, and the support leg locking device is arranged corresponding to the swing support leg 3. One of the engineering machines can be a pump truck, the pump truck comprises a truck frame 1, a fixed turret 8 is arranged on the truck frame 1, and when the pump truck works, a swing supporting leg 3 connected to the fixed turret 8 swings outwards for a certain angle to avoid a cab, a telescopic arm 5 extends outwards to realize support as required; when accomplishing the operation or not opening the operation, flexible arm 5 retracts in swing arm 4, and swing landing leg 3 is in the state of drawing in, and the spacing hole 2 on swing landing leg 3 is arranged in to the locking subassembly is inserted, realizes spacingly, and flexible arm 5 outwards stretches out when preventing the maloperation and causes swing landing leg 3 and driver's cabin damage, and then improves the security.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides a landing leg locking means, includes the frame and rotates the swing landing leg of connection on the frame, its characterized in that, the swing landing leg includes swing arm and telescopic boom, the swing arm with the frame is rotated and is connected, telescopic boom slidable nest in the swing arm, landing leg locking means still includes the locking subassembly, the locking subassembly connect in the frame or telescopic boom, when the swing landing leg is in folded state the locking subassembly stops telescopic boom follows the swing arm stretches out.

2. The leg lock of claim 1, wherein the swing leg or the frame is disengaged from the lock assembly when the swing arm is deployed at a predetermined angle.

3. The leg locking device according to any one of claims 1 or 2, wherein the locking assembly is connected to the frame, the swing arm and the telescopic arm are respectively provided with a limiting hole, and when the telescopic arm is retracted into the swing arm, the limiting hole on the swing arm and the limiting hole on the telescopic arm are coaxial; when the swing supporting leg is in a folded state, the locking assembly is sequentially inserted into the limiting holes and used for limiting the telescopic arm to extend forwards.

4. The leg lock according to claim 3, wherein the swing arm and the telescopic arm are respectively provided with the stopper hole at a side close to the lock assembly; or the swing arm and the telescopic arm are respectively provided with the limiting holes on two sides correspondingly.

5. The leg locking device of claim 3, wherein the locking assembly comprises a limiting pin, and the limiting pin sequentially passes through a limiting hole on the swing arm and a limiting hole on the telescopic arm to limit the telescopic arm from extending out.

6. The leg locking device of claim 5 wherein the axis of the restraint pin is perpendicular to the length of the frame.

7. The leg locking device according to claim 5, wherein the end of the stopper pin facing the swing leg is provided with a gradually changing section, and the gradually changing section has a gradually decreasing cross-sectional dimension in a direction toward the leg.

8. The leg locking device of claim 5 wherein the locking assembly further comprises a support base removably attached to the frame, the stop pin being attached to an upper portion of the support base.

9. The leg locking device according to any one of claims 1 or 2, wherein the swing arm is provided with a first limiting hole, the locking assembly is connected to the telescopic arm, the locking assembly comprises a limiting pin, the frame is provided with a second limiting hole, and the limiting pin penetrates through the first limiting hole and enters the second limiting hole to limit the telescopic arm from extending forwards when the swing leg is in the folded state.

10. A construction machine comprising the leg lock device as claimed in any one of claims 1 to 9, wherein the frame comprises a fixed turret, the swing leg is pivotally connected to the fixed turret, and the leg lock device is provided corresponding to the swing leg.

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