CN113003455A - Locking device of lifting system and lifting system - Google Patents

Abstract

The invention discloses a locking device of a lifting system, the lifting system comprises a mounting rack and a movable pulley device connected to the mounting rack, the movable pulley device can move along the vertical direction, the locking device comprises: the locking plate is arranged on the mounting frame; the driving mechanism is connected with the locking plate and used for driving the locking plate to enable an included angle between the locking plate and the vertical direction to be switched between a first angle and a second angle; when the included angle between the locking plate and the vertical direction is a first angle, the locking plate locks the movable pulley device; when the locking plate and the vertical direction form a second angle, the movable pulley device can move along the vertical direction. The movable pulley device can be quickly and effectively switched between the working position and the maintenance position. The invention also provides a lifting system.

Description

Locking device of lifting system and lifting system

Technical Field

The invention relates to the field of lifting systems, in particular to a locking device of a lifting system and the lifting system.

Background

A dock ship lift is a mechanical device for lifting ships, mainly comprising a platform and a lifting system for driving the platform to lift and operate, wherein when a ship enters a dock, the ship is lifted out of the water surface through the lifting system so as to carry out rust removal coating and maintenance operation on the ship; wherein, the hoisting system is the core equipment of ship lift. The lifting system mainly comprises a lifting winch, a movable pulley device and a fixed pulley device, wherein the lifting winch is connected with the movable pulley device and the platform, and the platform is driven to be converted between a working position and a maintenance position through the movable pulley device.

Disclosure of Invention

The invention aims to realize the quick and effective switching of a movable pulley device between a working position and a maintenance position. The invention provides a locking device of a lifting system, which can quickly and effectively convert a movable pulley device between a working position and a maintenance position.

In order to solve the above technical problem, an embodiment of the present invention discloses a locking device of a hoisting system, the hoisting system includes a mounting bracket and a movable pulley device connected to the mounting bracket, the movable pulley device is capable of moving in a vertical direction, the locking device includes:

the locking plate is arranged on the mounting frame;

the driving mechanism is connected with the locking plate and used for driving the locking plate to enable an included angle between the locking plate and the vertical direction to be switched between a first angle and a second angle; wherein the content of the first and second substances,

when the included angle between the locking plate and the vertical direction is a first angle, the locking plate locks the movable pulley device;

when the locking plate and the vertical direction form a second angle, the movable pulley device can move along the vertical direction.

By adopting the technical scheme, the locking plate is controlled by the driving mechanism of the locking device, when the locking plate and the included angle in the vertical direction are the second angle, the movable pulley device is pulled to the working position or the maintenance position, and then the driving mechanism is controlled to enable the locking plate and the included angle in the vertical direction to be the first angle, so that the movable pulley device is locked at the working position or the maintenance position, and the movable pulley device can be quickly and effectively locked.

Optionally, the locking device further comprises a locking plate limiting mechanism which is installed on the installation frame and is arranged opposite to one side, away from the driving mechanism, of the locking plate, the locking plate limiting mechanism and the locking plate are provided with a first gap, and when the locking plate and the vertical included angle are in a second angle, the locking plate abuts against the locking plate limiting mechanism.

Optionally, the locking plate limiting mechanism comprises:

the bending piece is arranged below the mounting frame;

the abutting piece is arranged on one side, facing the locking plate, of the bending piece and used for abutting against the locking plate when the included angle between the locking plate and the vertical direction is a second angle.

Optionally, the bending piece has a first side connected to the mounting frame and a second side provided with the abutting piece, and an included angle between the first side and the second side is smaller than 90 degrees.

Optionally, the second side edge is further provided with a first limit sensor, and the first limit sensor is arranged below the abutting part and used for determining whether an included angle between the locking plate and the vertical direction reaches a second angle.

Optionally, the locking device further includes a driving limiting mechanism, which is installed on one side of the driving end of the driving mechanism and used for determining whether an included angle between the locking plate and the vertical direction reaches a first angle.

Optionally, the drive limiting mechanism comprises:

the limiting block is arranged on the driving end of the driving mechanism;

and the second limiting sensor is arranged on the driving mechanism and used for detecting whether the limiting block reaches a preset position so as to confirm whether the included angle between the locking plate and the vertical direction reaches a first angle.

Optionally, the locking plate comprises, in order:

the mounting hole is penetrated with a lock pin so as to connect the locking plate with the mounting frame;

and the locking hole is used for sleeving the movable pulley device in the locking hole to lock the movable pulley device when the included angle between the locking plate and the vertical direction is a first angle.

Optionally, the mounting hole and/or the locking hole is a kidney-shaped hole extending in a vertical direction.

Optionally, the mounting bracket has a first connecting portion and a second connecting portion connected to the locking plate, and the first connecting portion and the second connecting portion are respectively located on two sides of the locking plate, and a second gap is formed between the first connecting portion and the second connecting portion, and the second gap is larger than the thickness of the locking plate.

Optionally, the first connecting portion is provided with an arc-shaped protrusion abutting against the locking plate.

Optionally, the number of the locking plates is two, the two locking plates are respectively and symmetrically arranged on two sides of the movable pulley device, the movable pulley device moves between the locking plates along the vertical direction, and two ends of the driving mechanism are respectively connected with the two locking plates.

Optionally, the included angle between the second angle and the first angle is 0-6 degrees.

Optionally, the drive mechanism is a hydraulic cylinder.

The embodiment of the invention also discloses a lifting system which comprises the locking device.

The locking device of the lifting system provided by the invention has the following advantages:

(1) only one driving mechanism is adopted to drive the locking plate to move, so that the cost can be reduced;

(2) by actuating mechanism drive locking plate rotation, when the contained angle of locking plate and vertical direction is the second angle, draw the operating position or maintenance position with the movable pulley device, then actuating mechanism drive locking plate is so that its contained angle with vertical direction is first angle, thereby lock the movable pulley device at operating position or maintenance position, consequently, the one end and the mounting bracket of locking plate in this application are fixed connection, need not to realize reciprocating of locking plate through the plug lockpin, the life of locking plate has been improved, and the position that can accurately lock the movable pulley device.

Drawings

Fig. 1 is a schematic structural diagram of a lifting system and a locking device mounted on the lifting system according to an embodiment of the present invention;

FIG. 2 shows a right side view of FIG. 1;

FIG. 3 is a schematic view of the drive limiting mechanism and the lock plate limiting mechanism;

FIG. 4 shows a partial enlarged view of portion A of FIG. 1;

FIG. 5 shows a schematic structural view of the locking plate;

fig. 6 shows a schematic structural view of the drive limiting mechanism.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to these embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

In the description of the present embodiment, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed when used, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiment of the invention discloses a locking device of a lifting system, and as shown in fig. 1 and fig. 2, the lifting system comprises a mounting frame 1, a fixed pulley device 2 fixed on the mounting frame, a movable pulley device 3 which is connected with the fixed pulley device 2 through a steel wire rope and can move along the vertical direction, a lifting winch (not shown) which is connected below the movable pulley device 3 and drives a platform to lift, and a locking device which locks the movable pulley device 3 at a working position or a maintenance position. Specifically, as shown in fig. 2, the hoisting system further includes a winding drum 8, the movable pulley device 3 is connected to the winding drum 8 through a steel wire rope, and the rotation of the winding drum 8 drives the movable pulley device 3 to move in the vertical direction (as shown in the Y direction in fig. 1).

As shown in fig. 1 and 2, the movable pulley means 3 shown by solid lines represents the movable pulley means in the maintenance position, and the movable pulley means 3 shown by broken lines represents the movable pulley means in the working position, i.e., the movable pulley means 3 can be switched between the working position and the maintenance position in the vertical direction. As shown, the service position is above the working position.

The locking device comprises a locking plate 4 and a driving mechanism 5, wherein the locking plate 4 is arranged on the mounting frame 1; the driving mechanism 5 is connected with the locking plate 4 and used for driving the locking plate 4 to enable an included angle between the locking plate 4 and the vertical direction to be switched between a first angle and a second angle; when the included angle between the locking plate 4 and the vertical direction is a first angle, the locking plate 4 locks the movable pulley device 3, namely the movable pulley device 3 is fixed by the locking plate 4 and cannot move in the vertical direction; when the included angle between the locking plate 4 and the vertical direction is the second angle, the movable pulley device 3 can move along the vertical direction, that is, the movable pulley device 3 can move from the working position to the maintenance position or from the maintenance position to the working position along the vertical direction.

Among the prior art, the locking plate is connected with the lockpin of mounting bracket, it is not fixed, but fixed locking plate when inserting the lockpin, when extracting the lockpin, the locking plate reciprocates, when fixing the locking plate next time, the lockpin just can be fixed in the pore pair of needs locking plate, the degree of difficulty is aimed at to this kind of mode is big, and when inserting the lockpin, there is wearing and tearing to the hole of locking plate, can make the lockpin inaccurate with the alignment in hole after using for a long time, and the position of movable pulley device also can take place the deviation. In the locking device, when the lifting system works normally, the included angle between the locking plate 4 and the vertical direction is in a first angle to lock the movable pulley device 3, so that the lifting winch can run normally; when the position of movable pulley device 3 needs to be switched, the angle of locking plate 4 is adjusted to the position of the second angle relative to the vertical direction through driving mechanism 5, so that movable pulley device 3 can freely move to a proper position along the vertical direction, and then driving locking plate 4 to the first angle relative to the vertical direction through driving mechanism 5, so that locking plate 4 locks movable pulley device 3, and the lifting system continues subsequent operation.

By adopting the technical scheme, the locking plate 4 is controlled by the driving mechanism 5 of the locking device, when the locking plate 4 and the vertical direction form a second angle, the movable pulley device 3 is pulled to the working position or the maintenance position, the driving mechanism 5 is controlled to enable the locking plate 4 and the vertical direction form a first angle, and the movable pulley device 3 is locked at the working position or the maintenance position, so that the movable pulley device 3 can be quickly and effectively locked.

Further, two locking plates 4 are symmetrically arranged on two sides of the fixed pulley device 2 and the movable pulley device 3 respectively, namely the movable pulley device 3 is arranged between the two locking plates 4 and moves along the vertical direction, the driving mechanism 5 is arranged between the two locking plates 4, and two ends of the driving mechanism 5 are connected with the two locking plates 4 respectively.

Specifically, the drive mechanism 5 is connected to a control system that controls the length of extension and retraction of the drive mechanism 5. As shown in fig. 1, 3 and 4, when the locking plate 4 is at the position shown by the solid line in the figure, the driving mechanism 5 is in the contracted state, the angle between the locking plate 4 and the vertical direction is a first angle, for example, 0 °, and at this time, the locking plate 4 locks the movable pulley device 3; when the driving mechanism 5 extends outwards to control the locking plate 4 to rotate outwards and the locking plate 4 is at the position shown by the dotted line in the figure, the driving mechanism 5 stops driving, the locking plate 4 stops at the position with the second angle relative to the vertical direction, and at the moment, the movable pulley device 3 can move in the vertical direction.

Further, the difference between the second angle and the first angle is 0-6 degrees.

Further, locking device still includes locking plate stop gear 6, installs on mounting bracket 1, and keeps away from actuating mechanism 5 with locking plate 4 one side relative setting, and when movable pulley device 3 was in the locking state (locking plate 4 was first angle with the contained angle of vertical direction promptly), locking plate stop gear 6 had first clearance with locking plate 4, and when locking plate 4 was the second angle with the contained angle of vertical direction, locking plate 4 offseted with locking plate stop gear 6. That is, the driving mechanism 5 drives the locking plate 4 to rotate to the second angle so as to move the movable pulley device 3 in the vertical direction, so that the first gap provides a space for rotation when the locking plate 4 rotates to the second angle, and when the locking plate 4 abuts against the locking plate limiting mechanism 6, that is, the locking plate 4 rotates to the position, the locking plate 4 stops at the position.

Further, as shown in fig. 3, in the present embodiment, the lock plate stopper mechanism 6 includes:

the bending piece 61 is arranged below the mounting frame 1 and is fixed on the mounting frame 1 through bolts;

and the abutting piece 62 is arranged on one side of the bending piece 61 facing the locking plate 4 and used for abutting against the locking plate 4 when the included angle between the locking plate 4 and the vertical direction is a second angle, for example, the abutting piece 62 is a bolt, and the locking plate 4 abuts against the outer side surface of the bolt so as to prevent the locking plate 4 from further moving towards the direction larger than the second angle.

Further, the bending member 61 has a first side edge 611 connected to the mounting frame 1 and a second side edge 612 provided with an abutting member, and an included angle θ between the first side edge 611 and the second side edge 612 is smaller than 90 degrees. Because the locking plate 4 rotates to the second angle, an angle exists between the locking plate and the vertical direction, the included angle θ between the first side edge 611 and the second side edge 612 is smaller than 90 degrees, an avoidance space is provided, paint falling of the collision part or damage to the locking plate 4 due to collision between the locking plate 4 and the abutting part 62 is prevented, and the service life of the locking plate 4 is prolonged.

Further, the second side 612 is further provided with a first limit sensor 63, and the first limit sensor 63 is arranged below the abutting part 62, and is used for confirming whether an included angle between the locking plate 4 and the vertical direction reaches a second angle. Since the abutting piece 62 is disposed above the first limit sensor 63 and the abutting piece 62 protrudes from the second side 612, when the locking plate 4 reaches the second angle, the first limit sensor 63 can be protected from being damaged, and when the locking plate 4 reaches the second angle and abuts against the abutting piece 62, the first limit sensor 63 detects the locking plate 4, the first limit sensor 63 sends the in-place signal to the control system, and the control system controls the driving mechanism 5 to stop driving the locking plate 4 to move, so that the locking plate 4 stops at the position.

Further, as shown in fig. 3, in this embodiment, the locking device further includes a driving limiting mechanism 7, which is installed on one side of the driving end 51 of the driving mechanism 5, and is used for confirming whether an included angle between the locking plate 4 and the vertical direction reaches a first angle. When the driving mechanism 5 drives the locking plate 4 to move to the first angle from the second angle which is the included angle with the vertical direction, the limiting mechanism 7 is driven, so that the position of the locking plate 4 reaching the first angle can be determined.

Specifically, the portion of the lock plate 4 connected to the drive mechanism 5 has a connecting lug 45. The driving mechanism 5 comprises a driving end 51 and a fixed end 52, wherein the driving end 51 is connected with the connecting lug plate 45 of the locking plate 4 at one side through a U-shaped connecting piece 73 in a pin joint mode, and the fixed end 52 is connected with the connecting lug plate 45 of the locking plate 4 at the other side in a pin joint mode.

Further, as shown in fig. 6, in the present embodiment, the drive limit mechanism 7 includes:

a stopper 71 provided on the driving end 51 of the driving mechanism 5;

and the second limit sensor 72 is arranged on the driving mechanism 5 and used for detecting whether the limit block 71 reaches a preset position so as to confirm whether the included angle between the locking plate 4 and the vertical direction reaches a first angle.

Specifically, the stopper 71 is fixedly attached to the U-shaped link 73 by a fastener such as a bolt, and the stopper 71 can be moved away from or close to the fixed end 52 as the driving end 51 is moved to be extended and retracted. The drive limiting mechanism 7 further includes a bracket 74, and the bracket 74 is disposed at the fixed end 52 and near the drive end 51. The second limit sensor 72 is fixed to the bracket 74 by a fastener such as a bolt to detect the limit block 71. When the driving end 51 of the driving mechanism 5 extends out, the limiting block 71 is driven to be away from the second limiting sensor 72; when the driving end 51 is retracted, the stopper 71 is brought close to the second stopper sensor 72. When the limiting block 71 reaches a preset position, that is, when the locking plate 4 reaches a first angle relative to the vertical direction, the second limiting sensor 72 detects the limiting block 71 and sends the in-place signal to the control system, the driving end 51 does not retract, that is, the driving mechanism 5 stops driving the locking plate 4 to move.

Further, as shown in fig. 5, in the present embodiment, the locking plate 4 includes a mounting hole 41 and a locking hole which are provided in this order in the vertical direction. Wherein, the mounting hole 41 is provided with a lock pin 14 in a penetrating way so as to connect the locking plate 4 with the mounting frame 1; the locking hole is used for locking the movable pulley device by sleeving the movable pulley device 3 in the locking hole when the included angle between the locking plate 4 and the vertical direction is a first angle. Specifically, the locking holes include a maintenance position locking hole 42 and a working position locking hole 43 for locking the movable pulley device 3 when the movable pulley device 3 is moved to the maintenance position and locking the movable pulley device 3 when moved to the working position, respectively. In addition, the locking plate 4 further includes a lifting hole 44 for lifting the locking plate 4 through the lifting hole 44 by a rope when the locking plate 4 is mounted to the mounting bracket 1, so that the locking plate 4 is placed at a designated position of the mounting bracket 1. Specifically, as shown in fig. 1, the movable pulley device 3 includes a movable pulley 31 and a movable pulley holder 32, wherein the movable pulley 31 includes a plurality of movable pulleys 31 that rotate in the axial direction of the movable pulley holder 32. Two ends of the movable pulley bracket 32 are respectively sleeved in the locking holes. More specifically, when the movable sheave apparatus 3 is moved to the maintenance position, the driving mechanism 5 is retracted to move the locking plate 4 in a direction at a first angle from the vertical direction, and when the locking plate 4 reaches the position at the first angle, the movable sheave bracket 32 is fitted in the maintenance position locking hole 42, thereby locking the movable sheave apparatus 3 at the maintenance position. Similarly, when the movable sheave apparatus 3 is moved to the working position, the movable sheave bracket 32 is fitted in the working position locking hole 43, thereby locking the movable sheave apparatus 3 at the working position.

Further, the mounting hole and/or the locking hole are waist-shaped holes extending in the vertical direction. The mounting hole 41 is a kidney-shaped hole to allow a space for rotation of the locking plate 4 when rotating between the first angle and the second angle. The locking hole is a waist-shaped hole, so that a movable space exists in the vertical direction, and the movable pulley device 3 can be conveniently sleeved in the locking hole.

Further, as shown in fig. 4, in the present embodiment, the mounting bracket 1 has a first connecting portion 11 and a second connecting portion 12 connected to the locking plate 4, which are respectively located at two sides of the locking plate 4, and a second gap is formed between the first connecting portion 11 and the second connecting portion 12, which is greater than the thickness of the locking plate 4, so that a rotating space can be provided when the locking plate 4 rotates from a first angle to a second angle with the vertical direction.

Further, the first connecting portion 11 is provided with an arc-shaped projection 13 which abuts against the lock plate 4. The locking plate 4 abuts against the arc-shaped protrusion 13 when moving from the first angle to the second angle to the vertical, rotating around the surface of the arc-shaped protrusion 13, thereby providing support for the locking plate 4. In addition, this arc arch 13 makes locking plate 4 and first connecting portion 11 have a certain distance, consequently when locking plate 4 rotated to be the second angle with vertical direction, prevents that locking plate 4 from colliding with the upper end of first connecting portion 11, protects the finish and the structural integrity of mounting bracket 1 and locking plate 4.

Further, the driving mechanism 5 is a hydraulic cylinder.

The working principle of the locking device of the lifting system provided by the invention is as follows: when the locking plate 4 is located at a first angle relative to the vertical direction, the locking plate 4 locks the movable pulley device 3, and the movable pulley device 3 cannot move in the vertical direction. When the position of the pulley device 3 needs to be changed, for example, the pulley device is moved to a maintenance position or a working position, the driving mechanism 5 drives the locking plate 4 to move until an included angle between the locking plate 4 and the vertical direction is a second angle, the locking plate 4 abuts against the abutting part 62 of the locking plate limiting mechanism 6, the first limiting sensor 63 sends an in-place signal to the control system after detecting the locking plate 4, the control system controls the driving mechanism 5 to stop driving, the locking plate 4 stops at the position, and at the moment, the pulley device 3 can move in the vertical direction. When the movable pulley device 3 stops at the working position or the maintenance position, the driving mechanism 5 drives the locking plate 4 to move until the included angle between the driving mechanism 5 and the vertical direction is a first angle, the second limit sensor 72 of the driving limiting mechanism 7 detects the limit block 71 and sends an in-place signal to the control system, the control system controls the driving mechanism 5 to stop driving, the locking plate 4 stops at the position, and at the moment, the movable pulley device 3 is locked at the working position or the maintenance position.

According to the locking device of the lifting system, the locking work of the movable pulley device 3 can be completed only by driving the locking plate 4 to move by the driving mechanism 5, and the locking device is quick and efficient.

The invention also provides a lifting system comprising any one of the locking devices described above.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, taken in conjunction with the specific embodiments thereof, and that no limitation of the invention is intended thereby. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (14)

1. A locking device for a hoisting system, the hoisting system comprising a mounting frame and a movable pulley device connected to the mounting frame, the movable pulley device being movable in a vertical direction, characterized in that the locking device comprises:

the locking plate is arranged on the mounting frame;

the driving mechanism is connected with the locking plate and used for driving the locking plate to enable an included angle between the locking plate and the vertical direction to be switched between a first angle and a second angle; wherein the content of the first and second substances,

when the included angle between the locking plate and the vertical direction is the first angle, the locking plate locks the movable pulley device;

when the locking plate and the included angle in the vertical direction are the second angle, the movable pulley device can move in the vertical direction.

2. The locking device according to claim 1, further comprising a locking plate limiting mechanism mounted on the mounting frame and disposed opposite to a side of the locking plate away from the driving mechanism, wherein the locking plate limiting mechanism and the locking plate have a first gap, and when the locking plate and the vertical direction form the second angle, the locking plate abuts against the locking plate limiting mechanism.

3. The locking device of claim 2, wherein the locking plate retention mechanism comprises:

the bending piece is arranged below the mounting frame;

and the abutting piece is arranged on one side of the bending piece facing the locking plate and used for abutting against the locking plate when the included angle between the locking plate and the vertical direction is the second angle.

4. The locking device according to claim 3, wherein the bending member has a first side connected to the mounting frame and a second side provided with the abutting member, and an included angle between the first side and the second side is smaller than 90 degrees.

5. The locking device according to claim 4, wherein the second side is further provided with a first limit sensor, and the first limit sensor is arranged below the abutting member and used for confirming whether the included angle between the locking plate and the vertical direction reaches the second angle.

6. The locking device according to claim 1, further comprising a driving limiting mechanism installed at one side of a driving end of the driving mechanism for confirming whether an included angle between the locking plate and the vertical direction reaches the first angle.

7. The locking device of claim 6, wherein the actuation limiting mechanism comprises:

the limiting block is arranged on the driving end of the driving mechanism;

and the second limiting sensor is arranged on the driving mechanism and used for detecting whether the limiting block reaches a preset position so as to confirm whether the locking plate and the included angle in the vertical direction reach the first angle.

8. Locking device according to claim 1, characterized in that said locking plate comprises, in succession:

the mounting hole is penetrated with a lock pin so as to connect the locking plate with the mounting frame;

and the locking hole is used for sleeving the movable pulley device in the locking hole to lock the movable pulley device when the locking plate and the included angle in the vertical direction are the first angle.

9. Locking device according to claim 8, characterized in that the mounting hole and/or the locking hole is a kidney-shaped hole, extending in a vertical direction.

10. The locking device of claim 1, wherein the mounting bracket has a first connecting portion and a second connecting portion connected to the locking plate, the first connecting portion and the second connecting portion being located on opposite sides of the locking plate, respectively, and a second gap is provided between the first connecting portion and the second connecting portion, the second gap being greater than a thickness of the locking plate.

11. The locking device of claim 10, wherein the first connecting portion is provided with an arcuate projection that abuts the locking plate.

12. The locking device according to any one of claims 1 to 11, wherein two locking plates are symmetrically disposed on both sides of the movable pulley device, and both ends of the driving mechanism are connected to the two locking plates.

13. Locking device according to any one of claims 1 to 11, characterized in that the difference between the second angle and the first angle is 0-6 °.

14. A lifting system, characterized in that it comprises a locking device according to any one of claims 1 to 13.

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