CN218025167U - Rope skipping prevention device for winding multilayer steel wire rope by duplex winding drum and crane - Google Patents

Abstract

The utility model provides a prevent rope skipping device and hoist for double-wound drum coiling multilayer wire rope, prevent rope skipping device locates on the trolley frame, and be located between trolley frame and the double-wound drum, prevent rope skipping device including first mount pad, second mount pad and guide arm, the both ends of guide arm are located respectively first mount pad with on the second mount pad, the guide arm outside is equipped with a plurality of guide slots, the at least one end of guide arm can be towards being close to the direction motion of double-wound drum, the utility model discloses a correspond prevent rope skipping device is right wire rope leads, can make wire rope is in when coiling to or releasing on the double-wound drum, can not with wire rope position corresponds produce great contained angle between the radial of double-wound drum to effectual emergence of having avoided rope skipping phenomenon, thereby promoted the double-wound drum is going on wire rope or the security of release in-process.

Description

Rope skipping prevention device for winding multilayer steel wire rope by duplex winding drum and crane

Technical Field

The utility model relates to a hoist technical field especially relates to a prevent rope skipping device and have this prevent crane of rope skipping device for preventing take place rope skipping when coiling multilayer wire rope on the pair reel.

Background

In some capital construction processes, the foundation pit often needs to be dug deeply for dozens of meters or even hundreds of meters, and in order to discharge the dregs at the bottom of the foundation pit, one common mode is to transport the dregs out of the bottom of the foundation pit by adopting a drum crane matched with a lifting appliance.

Because the space of the foundation pit in the radial direction is limited, in order to reduce the amplitude of radial swing of the electric lifting appliance in the process of up-and-down movement, collision between the lifting appliance and the side wall of the foundation pit is avoided, and the lifting appliance can move up and down vertically as much as possible, two groups of steel wire ropes which are synchronously wound and unwound are arranged on the winding drum and are respectively connected with two fixed pulleys with a certain distance, but because the foundation pit is deeper, the length of the steel wire ropes is increased accordingly, so that a plurality of layers of steel wire ropes need to be wound on the winding drum, when a first layer of steel wire ropes is wound, rope skipping phenomenon hardly occurs in the winding process because rope grooves are formed in the winding drum, after the first layer of steel wire ropes is wound, the second layer and even the third layer of steel wire ropes are wound, because no rope grooves exist in the process of winding the steel wire ropes and lubricating oil is coated on the steel wire ropes, in the process of winding two steel wire ropes on the winding drum, because the distances between the fixed pulleys which correspond to each other are constant, the angle of the steel wire ropes wound on the winding drum is gradually changed, the steel wire ropes are easy to cause rope to be gradually increased or decreased from the maximum angle, the steel wire ropes are not to be wound and the two sides of the winding drum, and the supporting frame of the crane is easy to cause large supporting frame, and the crane to be abraded, and the crane is easy to cause large crane to be impacted by the crane, and the crane.

The existing rope skipping prevention device is designed almost aiming at a winding drum wound by a single-layer steel wire rope, the guide rope wheel and the tension spring are used for guiding the steel wire rope, wherein the guide rope wheel can move along the axial direction of the guide rod in the process of guiding the steel wire rope, so that the steel wire rope can be wound orderly according to a rope groove on the winding drum, but the rope can be wound by a first layer, when the steel wire rope on a second layer or even a third layer is wound, the rope groove is not formed, the acting force of the steel wire rope between the winding drum and a fixed pulley can not be overcome by the existing rope guide wheel of the rope skipping prevention device, and the steel wire rope can not be effectively guided to be continuously wound on the winding drum in a tight and orderly manner.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide an anti-jump rope device capable of guiding a steel wire rope by winding and releasing a steel wire rope of a second layer or even a third layer on a duplex winding drum, and a crane having the anti-jump rope device.

The utility model provides a rope skipping prevention device for duplex reel coiling multilayer wire rope, rope skipping prevention device locates on the trolley frame, and is located between trolley frame and the duplex reel, rope skipping prevention device is equipped with two sets ofly, one rope skipping prevention device corresponds the left side section of duplex reel, another rope skipping prevention device corresponds the right side section of duplex reel, rope skipping prevention device includes first mount pad, second mount pad and guide arm, the both ends of guide arm are located respectively first mount pad with on the second mount pad, the guide arm outside is equipped with a plurality of guide slots, the guide arm at least one end can be towards being close to the direction motion of duplex reel, so that the guide arm can restrict being located wire rope in the guide slot, wherein, the duplex reel is located the upper surface of trolley frame, and with the upper surface interval of trolley frame is at a certain distance, two rope skipping prevention device symmetry sets up.

Further, along the axial direction of the guide rod, the guide rod is rotatably arranged on the first mounting seat and the second mounting seat, and the guide groove is an annular groove.

Furthermore, along the horizontal direction, one end of the guide rod is rotatably arranged on the first mounting seat, the other end of the guide rod is connected with the second mounting seat through an adjusting mechanism, and the adjusting mechanism is used for adjusting the distance between the guide rod and the second mounting seat in the horizontal direction.

Further, the adjusting mechanism is an air cylinder or a push rod.

Furthermore, the adjusting mechanism comprises a push column in threaded connection with the second mounting seat, one end of the push column penetrates through the second mounting seat to be connected with the guide rod, and the position of the guide rod relative to the second mounting seat is changed by rotating the push column.

Furthermore, a spring is sleeved on the push column, one end of the spring abuts against the second mounting seat, and the other end of the spring abuts against the guide rod.

Further, the depth of the guide groove does not exceed the diameter of the steel wire rope.

Further, the depth of the guide groove is half of the diameter of the steel wire rope.

The utility model also provides a hoist, the hoist includes any of the above-mentioned scheme the rope skipping prevention device that is used for pair reel coiling multilayer wire rope, the hoist still includes crane span structure and dolly, the dolly is located on the crane span structure, the dolly includes pair reel, drive arrangement, trolley frame, hoist, two wire rope, pair reel with drive arrangement all locates on the trolley frame, two wire rope connects respectively the hoist with between the pair reel, drive arrangement is used for the drive pair reel rotates right wire rope convolutes or releases so that the hoist realizes going up and down.

Furthermore, the bottom of trolley frame is equipped with two first fixed pulley groups at a certain distance apart, each first fixed pulley group includes the first fixed pulley of two coaxial settings, the hoist includes gallows and lifting hook, the lifting hook is located on the gallows, correspond two on the gallows first fixed pulley group is equipped with two second fixed pulley groups, each second fixed pulley group includes the second fixed pulley of two coaxial settings, one wire rope follows after leading out from the left side section or the right side section of twin drum in proper order around one second fixed pulley, one first fixed pulley, same another of second fixed pulley group second fixed pulley and same behind the first fixed pulley with the gallows is connected.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a correspond on the trolley frame the left side section and the right side section of pair reel respectively set up one prevent the rope skipping device, prevent the rope skipping device including first mount pad, second mount pad and guide arm, the both ends of guide arm are located respectively first mount pad with on the second mount pad, the guide arm outside is equipped with a plurality of guide slots, the at least one end of guide arm can be towards being close to the direction motion of pair reel, so that the guide arm can be to being located in the guide slot wire rope restricts, so that pair reel is to second layer or third layer when wire rope convolutes or releases, through corresponding prevent the rope skipping device right wire rope is led, can make wire rope is in when convoluteing to or releasing on the pair reel, can not with wire rope position corresponds produce great contained angle between the pair reel is radial to the effectual emergence of having avoided the rope skipping phenomenon, thereby promoted pair reel is going on wire rope convolutes or the security of release in-process.

Drawings

Fig. 1 is an overall schematic view of a specific embodiment of the rope skipping prevention device of the present invention.

Fig. 2 isbase:Sub>A cross-sectional view taken alongbase:Sub>A-base:Sub>A of fig. 1.

Fig. 3 is an enlarged view of a point a in fig. 1.

Fig. 4 is an enlarged view at B in fig. 1.

Fig. 5 is an overall schematic view of the crane according to the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention. It is to be understood that the drawings are provided solely for the purposes of reference and illustration and are not intended as a definition of the limits of the invention. The connection relationships shown in the drawings are for clarity of description only and do not limit the manner of connection.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; either mechanically or electrically, and may be internal to both elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

It should be further noted that in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1 and 5, the present invention provides an anti-skipping rope device 100 for a duplex winding drum to wind a multi-layer steel wire rope, wherein the anti-skipping rope device 100 is disposed on a trolley frame 200 and located between the trolley frame 200 and the duplex winding drum 300, and is configured to guide the steel wire rope 400 when the steel wire rope 400 of a second layer, a third layer or even more layers is wound or released on the duplex winding drum 300, so as to prevent the steel wire rope 400 from skipping when the steel wire rope 400 is wound or released on the duplex winding drum 300 and an included angle of a corresponding position on the duplex winding drum 300 is too large, which causes the steel wire rope 400 to skip, and causes the length of the steel wire rope 400 corresponding to the left section 310 and the right section 320 of the duplex winding drum 300 to be inconsistent, which causes the lifting appliance 500 to tilt, increases its swing amplitude, affects normal lifting, or even causes the crane to overturn, thereby causing a safety accident.

The duplex winding drum 300 is disposed on the upper surface of the trolley frame 200, and is spaced apart from the upper surface of the trolley frame 200 by a certain distance.

Two sets of the anti-jump rope device 100 are provided, one anti-jump rope device 100 corresponds to the left section 310 of the duplex winding drum 300, and the other anti-jump rope device 100 corresponds to the right section 320 of the duplex winding drum 300. The two rope skipping prevention devices 100 are symmetrically arranged along a plane where the radial direction of the flange at the middle position of the duplex winding drum 300 is located.

Referring to fig. 2-4 in combination with fig. 1, the anti-jump rope device 100 includes a first mounting seat 110, a second mounting seat 120, and a guide rod 130, wherein two ends of the guide rod 130 are respectively disposed on the first mounting seat 110 and the second mounting seat 120.

A plurality of guide grooves 131 are formed in the outer side of the guide rod 130, and at least one end of the guide rod 130 can move towards the direction close to the twin drum 300, so that the guide rod 130 can limit the steel wire ropes 400 in the guide grooves 131, thereby playing a role in guiding and preventing the steel wire ropes 400 from being arranged orderly and closely without limitation.

In one embodiment, both ends of the guide rod 130 are movable toward or away from the twin drum 300 by the adjusting mechanism 140, so that the guide rod 130 can guide winding or releasing of the two steel cables 400 on the twin drum 300 corresponding to the left segment 310 or the right segment 320, respectively.

Further, the guide rod 130 may be close to or far from the twin drum 300 in a horizontal direction, or may be obliquely upward and directly close to or far from the twin drum 300 in an axial direction of the twin drum 300.

In another embodiment, one end of the guide rod 130 is rotatably disposed on the first mounting seat 110 along a horizontal direction, the other end of the guide rod 130 is connected to the second mounting seat 120 through the adjusting mechanism 140, and a distance between the guide rod 130 and the second mounting seat 120 in the horizontal direction is adjusted by the adjusting mechanism 140, so that one end of the guide rod 130 corresponding to the second mounting seat 120 approaches or departs toward the duplex winding drum 300 with the first mounting seat 110 as a rotation center.

The rope skipping prevention device 100 is controlled to be close to or far from the duplex winding drum 300, so that rope skipping of the steel wire rope 400 cannot occur, the winding speed and the releasing moderate degree of the two steel wire ropes 400 are consistent when the two steel wire ropes 400 are wound or released on the duplex winding drum 300, the length of the part, between the duplex winding drum 300 and the lifting appliance 500, of the two steel wire ropes 400 is not inconsistent, the duplex winding drum 300 can stably drive the lifting appliance 500 to lift through the two steel wire ropes 400, the risk that the lifting appliance 500 collides with the side wall of a foundation pit due to large-amplitude swinging of the lifting appliance 500 in the lifting process is avoided, the duplex winding drum 300 shakes, and the crane is damaged.

In one embodiment, the guide bar 130 is non-rotatably disposed on the first and second mounting seats 110 and 120.

In another embodiment, the guide groove 131 is an annular groove along the axial direction of the guide rod 130, and the guide rod 130 is rotatably disposed on the first mounting seat 110 and the second mounting seat 120.

The guide rod 130 rotates to enable the friction force of the steel wire rope 400 in the guide groove 131 to be smaller than the corresponding friction force in the guide groove 131 when the guide rod 130 is not rotatable, so that the guide rod 130 has lower abrasion to the steel wire rope 400 when guiding the steel wire rope 400, and the service life of the steel wire rope 400 is effectively prolonged.

In one embodiment, the adjusting mechanism 140 is an air cylinder or a push rod, and the position of the guide rod 130 relative to the second mounting seat 120 is adjusted by controlling the air cylinder or the push rod to drive the guide rod 130 to move closer to or away from the direction of the twin drum 300.

Further, an elastic member is arranged at an output end of the push rod or the cylinder, and the elastic member is used for buffering the guide rod 130 when the wire rope 400 is guided, so as to reduce an interaction force between the wire rope 400 and the guide rod 130, and avoid the influence on the service life of the guide rod 130 and the service life of the wire rope 400 caused by rigid contact between the wire rope 400 and the guide rod 130.

In another embodiment, the adjusting mechanism 140 includes a push rod 141 screwed on the second mounting seat 120, one end of the push rod 141 passes through the second mounting seat 120 to connect with the guide bar 130, and the position of the guide bar 130 relative to the second mounting seat 120 is changed by rotating the push rod 141.

Further, a spring 142 is sleeved on the push rod 141, one end of the spring 142 abuts against the second mounting seat 120, and the other end of the spring 142 abuts against the guide rod 130.

Specifically, a stop 143 is further disposed between the spring 142 and the guide rod 130, and the stop 143 is sleeved on the push post 141 and is fixedly connected to an end of the spring 142.

By arranging the spring 142, when the guide rod 130 guides the steel wire rope 400, the guide rod 130 has a certain elastic buffering effect under the action of the steel wire rope 400 on the guide rod 130, so that the influence of rigid connection on the push column 141 on the service life of the guide rod 130 and the influence of the increase of the abrasion speed of the steel wire rope 400 on the service life of the steel wire rope 400 are avoided.

It should be noted that, in this embodiment, since one end of the guide rod 130 rotates along the other end of the guide rod 130, so that the axes of the guide rod 130 and the duplex drum 300 are not parallel to each other, but cross each other, and one end of the guide rod 130 close to the duplex drum 300 is just a portion of the larger rope angle between the steel cable 400 and the duplex drum 300, because the guide rod 130 is disposed obliquely, during the winding or releasing process of the steel cable 400, when the steel cable 400 is wound or released gradually toward the middle position of the duplex drum 300, the rope guiding effect of the guide rod 130 on the steel cable 400 is gradually reduced, that is, the pressing effect of the guide rod 130 on the steel cable 400 is gradually reduced, and when the steel cable 400 is wound or released gradually toward the end of the duplex drum 300, the rope guiding effect of the guide rod 130 on the steel cable 400 is gradually increased, that is, the pressing effect of the guide rod 130 on the steel cable 400 is gradually increased.

Further, the depth of the guide groove 131 does not exceed the diameter of the wire rope 400. Since the diameter of the guide bar 130 is not greater than the diameter of the duplex drum 300 and the steel cable 400 is continuously wound on the duplex drum 300, that is, the position of the steel cable 400 on the duplex drum 300 is continuously changed all the time, but the position of the steel cable 400 in the guide groove 131 of the guide bar 130 is not continuously changed, when the steel cable 400 is wound or unwound one turn on the duplex drum 300, the steel cable 400 jumps to an adjacent guide groove 131 in at least one guide groove 131, and therefore, in order to ensure that the steel cable 400 smoothly jumps in the adjacent guide groove 131, the depth of the guide groove 131 does not exceed the diameter of the steel cable 400.

Preferably, the depth of the guide groove 131 is half of the diameter of the steel wire rope 400, so as to further improve the efficiency of the steel wire rope 400 in jumping the groove in the adjacent guide groove 131, and further reduce the acting force of the guide groove 131 on the steel wire rope 400 during jumping the groove, thereby prolonging the service life of the steel wire rope 400.

Further, the first mounting seat 110 includes a first seat 111, a first pin 112 and a first bearing 113, the first seat 111 is disposed on the trolley frame 200, one end of the first pin 112 is rotatably disposed on the first seat 111, and the other end of the first pin 112 is connected to one end of the guide rod 130 through the first bearing 113, so that the guide rod 130 can rotate relative to the first pin 112.

The second mounting seat 120 includes a second seat 121, a second pin shaft 122 and a second bearing 123, the second seat 121 is disposed on the trolley frame 200, the push post 141 penetrates through the second seat 121 and at least partially extends out of the second seat 121, one end of the second pin shaft 122 is connected to one end of the push post 141 far away from the first seat 111, and the other end of the second pin shaft 122 is connected to the other end of the guide rod 130 through the second bearing 123.

In one embodiment, the first pin 112 and the second pin 122 are an integral structure and are disposed through the axis of the guide rod 130.

Referring to fig. 5, the present invention further provides a crane, wherein the crane includes the rope-jump preventing device 100 for winding the multi-layer steel wire rope by the duplex winding drum according to any one of the above aspects.

The crane further comprises a bridge (not shown) and a trolley arranged on the bridge and movable thereon.

The trolley comprises a duplex winding drum 300, a driving device 600, a trolley frame 200, a lifting appliance 500 and two steel wire ropes 400. The duplex drum 300 and the driving device 600 are both arranged on the trolley frame 200, the two steel wire ropes 400 are respectively connected between the lifting appliance 500 and the duplex drum 300, and the driving device 600 is used for driving the duplex drum 300 to rotate so as to wind or release the steel wire ropes 400, so that the lifting appliance 500 is lifted.

Further, two first fixed pulley blocks 700 are arranged at the bottom of the trolley frame 200 at a certain interval, and each first fixed pulley block 700 comprises two first fixed pulleys which are coaxially arranged.

The hanger 500 comprises a hanger 510 and a hook 520, the hook 520 is arranged on the hanger 510, two second fixed pulley blocks 800 are arranged on the hanger 510 corresponding to the two first fixed pulley blocks 700, and each second fixed pulley block 800 comprises two coaxially arranged second fixed pulley blocks 810.

The wire rope 400 is led out from the left section 310 or the right section 320 of the twin drum 300, and then sequentially wound around one of the second fixed pulley 810, one of the first fixed pulley, another of the second fixed pulley 810 of the same second fixed pulley block 800, and another of the first fixed pulley of the same first fixed pulley block 700, and then connected to the hanger 510.

Through the arrangement of the first fixed pulley block 700 and the second fixed pulley block 800, each steel wire rope 400 is stressed more uniformly after passing through the first fixed pulley block 700 and the second fixed pulley block 800, so that the connection of the lifting appliance 500 is more stable, and the risk of shaking of the lifting appliance 500 in the movement process is effectively reduced.

Specifically, the distance between two first fixed pulley blocks 700 is the same as the distance between two second fixed pulley blocks 800, and when the spreader 500 is suspended, one first fixed pulley block 700 is located right below the other second fixed pulley block 800.

In one embodiment, the axial direction of the first fixed pulley and the axial direction of the second fixed pulley 810 are parallel to each other.

In another embodiment, the axial direction of the first fixed pulley is perpendicular to the axial direction of the second fixed pulley 810.

Further, a rope groove (not shown) is formed in the duplex winding drum 300, wherein the rope grooves of the left section 310 and the right section 320 are symmetrically arranged, the rope groove is used for winding the steel wire rope 400 of the first layer, and preferably, the depth of the rope groove is half of the diameter of the steel wire rope 400.

Throughout the description and claims of this application, the words "comprise/comprises" and the words "have/includes" and variations of these are used to specify the presence of stated features, values, steps or components but do not preclude the presence or addition of one or more other features, values, steps, components or groups thereof.

Some features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, certain features of the invention, which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable combination in different embodiments.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention should be included in the present invention.

Claims (10)

1. The rope skipping prevention device is characterized in that the rope skipping prevention device is provided with two groups, one rope skipping prevention device corresponds to the left section of the duplex winding drum, the other rope skipping prevention device corresponds to the right section of the duplex winding drum, the rope skipping prevention device comprises a first mounting seat, a second mounting seat and a guide rod, two ends of the guide rod are respectively arranged on the first mounting seat and the second mounting seat, a plurality of guide grooves are formed in the outer side of the guide rod, at least one end of the guide rod can move towards the direction close to the duplex winding drum, so that the guide rod can limit the steel wire rope in the guide grooves, the duplex winding drum is arranged on the upper surface of the trolley frame and is spaced from the upper surface of the trolley frame by a certain distance, and the two rope skipping prevention devices are symmetrically arranged.

2. The anti-jump device of claim 1, wherein the guide rod is rotatably disposed on the first and second mounting seats along an axial direction of the guide rod, and the guide groove is an annular groove.

3. The anti-jump rope device for the duplex drum winding of the multi-layer steel wire rope according to claim 1, wherein one end of the guide rod is rotatably disposed on the first mounting seat along a horizontal direction, and the other end of the guide rod is connected to the second mounting seat through an adjusting mechanism, and the adjusting mechanism is used for adjusting a distance between the guide rod and the second mounting seat along the horizontal direction.

4. The anti-jump rope device for a twin drum winding multi-layer steel wire rope according to claim 3, wherein the adjusting mechanism is a cylinder or a push rod.

5. The anti-jump rope device for a duplex drum to wind a multi-layer steel wire rope according to claim 3, wherein the adjusting mechanism comprises a push post screwed on the second mounting seat, one end of the push post passes through the second mounting seat to connect with the guide rod, and the position of the guide rod relative to the second mounting seat is changed by rotating the push post.

6. The rope skipping prevention device for the duplex winding drum to wind the multilayer steel wire rope according to claim 5, wherein a spring is sleeved on the push column, one end of the spring abuts against the second mounting seat, and the other end of the spring abuts against the guide rod.

7. The anti-jump device for twin drum winding of multi-layer steel cord according to claim 1, wherein the depth of the guide groove does not exceed the diameter of the steel cord.

8. The anti-jump device for twin drum winding multi-layer steel cord according to claim 7, wherein the depth of the guide groove is half the diameter of the steel cord.

9. The crane comprises the rope jumping prevention device for the duplex winding drum to wind the multilayer steel wire rope according to any one of claims 1 to 8, and is characterized by further comprising a bridge and a trolley, wherein the trolley is arranged on the bridge, the trolley comprises the duplex winding drum, a driving device, a trolley frame, a lifting appliance and two steel wire ropes, the duplex winding drum and the driving device are arranged on the trolley frame, the two steel wire ropes are respectively connected between the lifting appliance and the duplex winding drum, and the driving device is used for driving the duplex winding drum to rotate to wind or release the steel wire ropes so that the lifting appliance can be lifted.

10. The crane according to claim 9, wherein two first fixed pulley sets are disposed at a certain distance from the bottom of the trolley frame, each first fixed pulley set comprises two coaxially disposed first fixed pulleys, the lifting device comprises a lifting frame and a lifting hook, the lifting hook is disposed on the lifting frame, two second fixed pulley sets are disposed on the lifting frame corresponding to the two first fixed pulley sets, each second fixed pulley set comprises two coaxially disposed second fixed pulleys, and a steel wire rope is led out from the left section or the right section of the twin drum and then sequentially passes around one of the second fixed pulleys, one of the first fixed pulleys, the other of the second fixed pulleys of the same second fixed pulley set, and the other of the first fixed pulleys and then is connected to the lifting frame.

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