A rope lifting device for a crane and an operating method thereof

Abstract

The present invention provides a rope-lifting device for a crane and an operating method thereof, the rope-lifting device comprising: a mounting frame for mounting the rope-lifting frame, the mounting frame being provided with a friction wheel; the rope-lifting frame being movably connected with the mounting frame, the rope-lifting frame being provided with a pressure-bearing pulley and a rope-pressing roller, the wire rope passing through between the rope-pressing roller and the friction wheel and then bypassing the pressure-bearing pulley and passing out, when the rope-lifting frame is in a first position, the rope-pressing roller and the friction wheel are at a certain distance, and the wire rope passing between the rope-pressing roller and the friction wheel is in a free state; when the rope-lifting frame is in a second position, the rope-pressing roller abuts against the friction wheel, the wire rope between the rope-pressing roller and the friction wheel is pressed, and the rope-lifting frame is in a working state; a driving assembly comprising a rope-lifting frame driving cylinder and a friction wheel driving motor, the rope-lifting frame driving cylinder drives the rope-lifting frame to switch between the first position and the second position, the friction wheel driving motor drives the friction wheel to rotate, and when the rope-lifting frame is in a working state, the friction wheel rotates to drive the wire rope to move.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering machinery, and in particular relates to a rope lifting device for a crane and an operating method thereof. Background Art

[0002] Cranes work in an intermittent and repetitive manner, completing the handling and lifting of materials by raising and lowering the lifting hook. Wire rope is an indispensable and important component. There are certain applications for wire rope lifting devices. For example, in mine shaft operations, wire ropes need to be clamped and conveyed. The clamping reliability and transportation stability of wire ropes are more critical. During the wire rope conveying and lifting operations, the lifting mechanism needs to provide stable clamping force and moving speed.

[0003] The wire rope lifting and conveying devices are mostly used in mining equipment to achieve continuous clamping and conveying, and can provide stable and uniform clamping force to continuously convey the wire rope. However, the rope lifting device in the mining equipment needs to be installed with long guide rails and roller grooves, which is inconvenient to move and occupies a large space; on the other hand, it is only suitable for clamping and conveying the wire rope, and cannot achieve free movement of the wire rope when not in working state, and is not suitable for engineering cranes; therefore, it is necessary to provide a rope lifting device for cranes. Summary of the invention

[0004] The present invention provides a rope lifting device for a crane and an operating method thereof, which realize the rope lifting of a wire rope clamping, meet the requirements of wire rope clamping and conveying in operating conditions, and the wire rope is in a free state in non-operating conditions and does not affect the normal operation of the crane.

[0005] To achieve the above object, the present invention provides the following technical solutions.

[0006] A rope lifting device for a crane, comprising:

[0007] A mounting frame, used for mounting a rope lifting frame, the mounting frame is arranged on one side of a support, the support is fixedly mounted on a crane, and a friction wheel is arranged on the mounting frame;

[0008] The rope lifting frame is movably connected to the mounting frame, and the rope lifting frame is provided with a pressure pulley and at least one rope pressing roller, the pressure pulley, the rope pressing roller and the friction wheel are all located on the same plane, and the steel wire rope passes through between the rope pressing roller and the friction wheel and then bypasses the pressure pulley to pass out. The rope lifting frame has a first position and a second position. When the rope lifting frame is in the first position, there is a certain distance between the rope pressing roller and the friction wheel, and the steel wire rope passing between the rope pressing roller and the friction wheel is in a free state, and the rope lifting frame is in a non-working state; when the rope lifting frame is in the second position, the rope pressing roller abuts against the friction wheel, and the steel wire rope passing between the rope pressing roller and the friction wheel is pressed against the friction wheel, and the rope lifting frame is in a working state.

[0009] The driving assembly includes a rope lifting frame driving cylinder and a friction wheel driving motor. The rope lifting frame driving cylinder drives the rope lifting frame to switch between a first position and a second position. The friction wheel driving motor drives the friction wheel to rotate. When the rope lifting frame is in a working state, the friction wheel rotates to drive the steel wire rope to move, thereby achieving clamping and conveying of the steel wire rope.

[0010] Preferably, the mounting frame is provided with a first rotating hole at one end close to the support, the rope lifting frame has a first end and a second end, the first end of the rope lifting frame is provided with a second rotating hole, and the mounting frame and the rope lifting frame are hingedly connected by a rotating shaft passing through the first rotating hole and the second rotating hole.

[0011] Preferably, a roller mounting hole is provided on the upper side of the middle part of the rope lifting frame, the rope pressing roller is arranged in the roller mounting hole and can rotate freely along the roller mounting hole, and a connecting hole is provided on the lower side of the middle part of the rope lifting frame, and a connecting shaft is provided in the connecting hole; a waist-shaped hole is provided at the lower part of the end of the mounting frame away from the support, the connecting shaft passes through the waist-shaped hole and is connected with the telescopic end of the rope lifting frame driving cylinder, and the fixed end of the rope lifting frame driving cylinder is connected to the mounting frame, the rope lifting frame driving cylinder is telescopic, and drives the rope lifting frame to rotate along the waist-shaped hole with the rotating shaft as the rotation center along the connecting shaft; when the connecting shaft is located at the bottom of the waist-shaped hole, the rope lifting frame is located in the first position; when the rope lifting frame is located in the second position, the connecting shaft is close to the top of the waist-shaped hole.

[0012] Preferably, a proximity switch is provided on the mounting bracket, and the proximity switch is provided below the waist-shaped hole. When the connecting shaft is located at the bottom of the waist-shaped hole, the proximity switch is triggered to output a first position arrival signal.

[0013] Preferably, a first ear plate is provided on the mounting frame, and the first ear plate is hinged to the fixed end of the rope lifting frame driving cylinder; the rope lifting frame is connected to the second ear plate, and the second ear plate is hinged to the telescopic end of the rope lifting frame driving cylinder through the connecting shaft; a reinforcing rib is provided on one side of the rope lifting frame, and the second ear plate is fixedly connected to the reinforcing rib; a strain gauge is provided on the second ear plate, and the strain gauge detects the deformation amount of the second ear plate.

[0014] Preferably, the pressure pulley is arranged at the second end of the rope lifting frame; the rope lifting frame is also provided with a rope blocking pulley, which is located obliquely above the pressure pulley, and the rope blocking pulley allows the steel wire rope to pass freely between the pressure pulley and the rope blocking pulley, and blocks the steel wire rope from escaping from the pressure pulley.

[0015] Preferably, a friction wheel mounting hole is provided at the upper portion of one end of the mounting frame away from the support, and the friction wheel is mounted in the friction wheel mounting hole through a friction wheel center axis; the friction wheel driving motor is connected to the friction wheel center axis through a coupling to drive the friction wheel to rotate.

[0016] Preferably, there are a plurality of rope pressing rollers, all of which are located on a circumference centered on the friction wheel, and when the rope lifting frame is located at the second position, at least one of the rope pressing rollers abuts against the friction wheel.

[0017] Preferably, the mounting frames are divided into two groups which are arranged in parallel and symmetrically, and the rope lifting frames are divided into two groups which are arranged corresponding to the mounting frames; the rope lifting frame driving cylinders are divided into two groups which respectively drive the two groups of rope lifting frames to switch synchronously between the first position and the second position; the friction wheel driving motors are divided into one group which simultaneously drives the friction wheels of the two groups of mounting frames to rotate; the friction wheel driving motors are located on the motor mounting base, and the motor mounting base is fixed between the two groups of mounting frames.

[0018] Based on the same concept, the present invention also provides an operating method of the above-mentioned rope lifting device for a crane, comprising the following steps:

[0019] During the installation phase, a rope lifting frame with a rope pressing roller, a pressure pulley and a rope blocking pulley installed is provided, and the rotating shaft is passed through the first rotating hole and the second rotating hole to hinge the rope lifting frame with the mounting frame; the connecting shaft is passed through the second ear plate, the telescopic end of the rope lifting frame driving cylinder, the waist-shaped hole of the mounting frame and the connecting hole of the rope lifting frame; the fixed end of the rope lifting frame driving cylinder is hinged with the first ear plate, at which time the rope lifting frame driving cylinder is in an extended state, and the rope lifting frame is in the first position; the friction wheel driving motor is fixed to the motor mounting seat; the friction wheel is installed in the friction wheel mounting hole of the mounting frame through the friction wheel central axis, and the friction wheel driving motor is connected to the friction wheel central axis through a coupling to complete the installation;

[0020] In the preparation stage, the rope lifting frame driving cylinder is driven to retract, and the rope lifting frame is driven to rotate upward to the second position along the waist-shaped hole with the rotating shaft as the rotation center along the connecting shaft, so that the steel wire rope passing between the rope pressing roller and the friction wheel is pressed against the friction wheel, and the rope lifting frame is in a working state at this time;

[0021] In the operation stage, the friction wheel driving motor is driven to drive the friction wheel to rotate, and the friction force of the friction wheel is used to drive the steel wire rope to move to the required position to complete the rope lifting operation;

[0022] During the operation completion stage, the rope lifting rack driving cylinder is driven to extend, driving the rope lifting rack to rotate downward to the first position along the waist-shaped hole with the rotating shaft as the rotation center along the connecting shaft, so that the rope pressing roller is separated from the friction wheel, and the steel wire rope passing between the rope pressing roller and the friction wheel is in a free state, and the rope lifting rack returns to a non-working state.

[0023] Compared with the prior art, the technical solution of the embodiment of the present invention has beneficial effects.

[0024] For example, the present invention realizes the switching between the working state and the non-working state by switching between the first position and the second position of the rope lifting frame. In the working state, the friction wheel and the rope pressing roller press the steel wire rope, and the friction wheel rotates to clamp and convey the steel wire rope. The rope is loosened and lifted by adjusting the rotation direction of the friction wheel, and the operation is more flexible. In the non-working state, the steel wire rope is released without affecting the normal lifting operation.

[0025] For another example, the present invention provides a plurality of rope pressing rollers to cooperate with the friction wheel to press the steel wire rope, thereby increasing the wrap angle of the steel wire rope, thereby increasing the friction force and reducing the required oil cylinder pressure;

[0026] For another example, the present invention sets a proximity switch on the rope lifting frame. When the proximity switch confirms that the connecting shaft is located at the bottom of the waist-shaped hole when in the first position, the mounting frame bears the tension of the wire rope, thereby avoiding the situation where the rope lifting frame drives the oil cylinder to bear the tension of the wire rope, making the operation safer and more reliable.

[0027] For another example, the present invention provides a strain gauge on the second ear plate connected to the rope lifting frame driving cylinder to detect the force applied to the second ear plate during operation to prevent the force from exceeding its rated load, thereby making the operation safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 1 is a schematic diagram of the structure of a rope lifting device for a crane in an embodiment of the present invention;

[0029] Figure 2 is a top view of a rope lifting device for a crane in an embodiment of the present invention;

[0030] Figure 3 is a side sectional view of a rope lifting device for a crane in an embodiment of the present invention;

[0031] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0032] Figure 5 It is a schematic diagram of the installation of a friction wheel, a rope pressing roller, a pressure pulley and a rope blocking pulley of a rope lifting device for a crane in an embodiment of the present invention;

[0033] Figure 6 Schematic diagram of a non-working state of a rope lifting device for a crane in an embodiment of the present invention;

[0034] Figure 7 Schematic diagram of the working state of the rope lifting device for a crane in an embodiment of the present invention;

[0035] Figure 8 is a schematic diagram of the installation of the mounting frame in an embodiment of the present invention;

[0036] Fig. 9 It is a schematic diagram of the structure of the rope lifting frame in an embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 1. Mounting frame; 11. Friction wheel; 12. First rotary hole; 13. Rotating axis; 14. Waist-shaped hole; 15. First ear plate; 16. Friction wheel mounting hole; 17. Friction wheel center axis; 18. Motor mounting seat;

[0039] 2. Rope lifting frame; 21. Pressure pulley; 22. Rope pressing roller; 23. Rope blocking pulley; 24. Second rotating hole; 25. Roller mounting hole; 26. Connecting hole; 27. Connecting shaft; 28. Second ear plate; 29. ​​Reinforcement rib;

[0040] 3. Support;

[0041] 4. Rope lifting frame driving cylinder;

[0042] 5. Friction wheel drive motor; 51. Coupling;

[0043] 6. Wire rope;

[0044] 7. Proximity switch. DETAILED DESCRIPTION

[0045] In order to make the purpose, features and beneficial effects of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It is understood that the specific embodiments described below are only used to explain the present invention, rather than to limit the present invention. In addition, the same or similar reference numerals may be used in the figures to refer to the same or similar elements in different embodiments, and the description of the same or similar elements in different embodiments and the description of the prior art elements, features, effects, etc. may be omitted.

[0046] Reference Figures 1 to 9 , an embodiment of the present invention provides a rope lifting device for a crane.

[0047] Specifically, they include:

[0048] A mounting frame 1 is used to mount a rope lifting frame 2. The mounting frame 1 is arranged on one side of a support 3. The support 3 is fixedly mounted on the crane. A friction wheel 11 is arranged on the mounting frame 1.

[0049] The rope lifting frame 2 is movably connected to the mounting frame 1. A pressure pulley 21 and at least one rope pressing roller 22 are provided on the rope lifting frame 1. The pressure pulley 21, the rope pressing roller 22 and the friction wheel 11 are all located on the same plane. The steel wire rope 6 passes between the rope pressing roller 22 and the friction wheel 11 and then bypasses the pressure pulley 21 to pass out. The rope lifting frame 2 has a first position and a second position. When the rope lifting frame 2 is in the first position, the rope pressing roller 22 and the friction wheel 11 have a certain distance. The steel wire rope 6 passing between the rope pressing roller 22 and the friction wheel 11 is in a free state, and the rope lifting frame 2 is in a non-working state; when the rope lifting frame 2 is in the second position, the rope pressing roller 22 abuts against the friction wheel 11, and the steel wire rope 6 passing between the rope pressing roller 22 and the friction wheel 11 is pressed to the friction wheel 11, and the rope lifting frame 2 is in a working state.

[0050] The driving assembly includes a rope lifting frame driving cylinder 4 and a friction wheel driving motor 5. The rope lifting frame driving cylinder 4 drives the rope lifting frame 2 to switch between the first position and the second position. The friction wheel driving motor 5 drives the friction wheel 11 to rotate. When the rope lifting frame 2 is in a working state, the friction wheel 11 rotates to drive the wire rope 6 to move, thereby realizing the clamping and conveying of the wire rope 6.

[0051] In some embodiments, a first rotating hole 12 is provided at one end of the mounting frame 1 close to the support 3, the rope lifting frame 2 has a first end and a second end, a second rotating hole 24 is provided at the first end of the rope lifting frame 2, and the mounting frame 1 and the rope lifting frame 2 are hingedly connected by a rotating shaft 13 passing through the first rotating hole 12 and the second rotating hole 24.

[0052] In some embodiments, a roller mounting hole 25 is provided on the upper side of the middle part of the rope lifting frame 2, and the rope pressing roller 22 is provided in the roller mounting hole 25 and can rotate freely along the roller mounting hole 25. A connecting hole 26 is provided on the lower side of the middle part of the rope lifting frame 2, and a connecting shaft 27 is provided in the connecting hole 26; a waist-shaped hole 14 is provided at the lower part of the end of the mounting frame 1 away from the support 3, and the connecting shaft 27 passes through the waist-shaped hole 14 and is connected to the telescopic end of the rope lifting frame driving cylinder 4, and the fixed end of the rope lifting frame driving cylinder 4 is connected to the mounting frame 1, and the rope lifting frame driving cylinder 4 is telescopic, driving the rope lifting frame 2 to rotate along the waist-shaped hole 14 with the rotating shaft 13 as the rotation center along the connecting shaft 27; when the connecting shaft 27 is located at the bottom of the waist-shaped hole 14, the rope lifting frame 2 is located in the first position; when the rope lifting frame 2 is located in the second position, the connecting shaft 27 is close to the top of the waist-shaped hole 14.

[0053] In some embodiments, a proximity switch 7 is provided on the mounting frame 1, and the proximity switch 7 is provided below the waist-shaped hole 14. When the connecting shaft 27 is located at the bottom of the waist-shaped hole 14, the proximity switch 7 is triggered to output a first position arrival signal; it is confirmed that the connecting shaft 27 is located at the bottom of the waist-shaped hole 14 when in the first position, and the mounting frame 1 bears the tension of the wire rope 6, thereby avoiding the situation where the rope lifting frame drives the oil cylinder 4 to bear the tension of the wire rope 6, making the operation safer and more reliable.

[0054] In some embodiments, a first ear plate 15 is provided on the mounting frame 1, and the first ear plate 15 is hinged to the fixed end of the rope lifting frame driving cylinder 4; the rope lifting frame 2 is connected to the second ear plate 28, and the second ear plate 28 is hinged to the telescopic end of the rope lifting frame driving cylinder 4 through a connecting shaft 27; a reinforcing rib 29 is provided on one side of the rope lifting frame 2, and the second ear plate 28 is fixedly connected to the reinforcing rib 29; a strain gauge (not shown) is provided on the second ear plate 28, and the strain gauge detects the deformation amount of the second ear plate 28, detects the force of the second ear plate 28 during operation, prevents the force from exceeding its rated load, and makes the operation safer and more reliable.

[0055] In some embodiments, the pressure pulley 21 is arranged at the second end of the rope lifting frame 2 to bear the tension of the wire rope 6; the rope lifting frame 2 is also provided with a rope stopping pulley 23, which is located obliquely above the pressure pulley 21. The rope stopping pulley 23 allows the wire rope 6 to pass freely between the pressure pulley 21 and the rope stopping pulley 23, and prevents the wire rope 6 from escaping from the pressure pulley 21.

[0056] In some embodiments, a friction wheel 11 mounting hole 16 is provided at the upper portion of one end of the mounting frame 1 away from the support 3, and the friction wheel 11 is mounted on the friction wheel mounting hole 16 through the friction wheel center axis 17; the friction wheel drive motor 5 is connected to the friction wheel center axis 17 through the coupling 51 to drive the friction wheel 11 to rotate.

[0057] In some embodiments, there are multiple rope pressing rollers 22, and the multiple rope pressing rollers 22 are all located on a circumference centered on the friction wheel 11. When the rope lifting frame 2 is in the second position, at least one rope pressing roller 22 abuts against the friction wheel 11. Multiple rope pressing rollers 22 are arranged to cooperate with the friction wheel 11 to press the wire rope 6, increase the wrap angle of the wire rope 6, thereby increasing the friction force and reducing the required pressure of the rope lifting frame driving cylinder 4.

[0058] In some embodiments, the mounting frame 1 is divided into two groups arranged in parallel and symmetrically, and the rope lifting frame 2 is divided into two groups arranged corresponding to the mounting frame 1; the rope lifting frame driving cylinder 4 is divided into two groups, which respectively drive the two groups of rope lifting frames 2 to switch synchronously between the first position and the second position; the friction wheel driving motor 5 is divided into one group, which drives the friction wheels 11 of the two groups of mounting frames 1 to rotate at the same time; the friction wheel driving motor 5 is located on the motor mounting seat 18, and the motor mounting seat 18 is fixed between the two groups of mounting frames 1. The motor mounting seat 18 is cross-shaped, and the left and right ends are respectively welded to the inner sides of the two mounting frames 12.

[0059] The present invention also provides an operating method for a rope lifting device for a crane, comprising the following steps:

[0060] During the installation phase, a rope lifting frame 2 with a rope pressing roller 22, a pressure pulley 21 and a rope blocking pulley 23 installed is provided, and the rotating shaft 13 is passed through the first rotating hole 12 and the second rotating hole 24 to hinge the rope lifting frame 2 with the mounting frame 1; the connecting shaft 27 is passed through the second ear plate 28, the telescopic end of the rope lifting frame driving cylinder 4, the waist-shaped hole 14 of the mounting frame 1 and the connecting hole 26 of the rope lifting frame 2; the fixed end of the rope lifting frame driving cylinder 4 is hinged with the first ear plate 15, at which time the rope lifting frame driving cylinder 4 is in an extended state, and the rope lifting frame 2 is in the first position; the friction wheel driving motor 5 is fixed to the motor mounting seat 18; the friction wheel 11 is installed in the friction wheel mounting hole 16 of the mounting frame 1 through the friction wheel central axis 17, and the friction wheel driving motor 5 is connected to the friction wheel central axis 17 through the coupling 51 to complete the installation;

[0061] In the preparation stage, the rope lifting frame driving cylinder 4 is driven to retract, driving the rope lifting frame 2 to rotate upward to the second position along the waist-shaped hole 14 with the rotary shaft 13 as the rotation center along the connecting shaft 27, so that the wire rope 6 passing between the rope pressing roller 22 and the friction wheel 11 is pressed against the friction wheel 11, and the rope lifting frame 2 is in the working state;

[0062] During the operation phase, the friction wheel driving motor 5 drives the friction wheel 11 to rotate, and the friction force of the friction wheel 11 is used to drive the wire rope 6 to move to the required position to complete the rope lifting operation; it should be noted that the friction force should be greater than the self-weight of the wire rope 6 or the sum of the self-weight of the wire rope 6 and the force on the wire rope 6;

[0063] When the friction wheel 11 rotates counterclockwise, the rope is loosened and the steel wire rope 6 moves down. When the friction wheel 11 rotates clockwise, the rope is retracted and the steel wire rope 6 moves up. The position of the steel wire rope 6 can be adjusted multiple times by adjusting the rotation direction of the friction wheel 11.

[0064] At the completion stage of the operation, the rope lifting frame driving cylinder 4 is extended, driving the rope lifting frame 2 to rotate downward to the first position along the waist-shaped hole 14 with the rotating shaft 13 as the rotation center along the connecting shaft 27, so that the rope pressing roller 22 is separated from the friction wheel 11, and the wire rope 6 passing between the rope pressing roller 22 and the friction wheel 11 is in a free state, and the rope lifting frame 2 returns to a non-working state.

[0065] The rope lifting device for a crane provided by the present invention is suitable for tower operations of a wind power maintenance crane, and can achieve a state in which one end of the steel wire rope 6 is loose and the other end is tight, which is convenient for the inspection and installation of the steel wire rope 6 and related equipment. It is also suitable for crane equipment and other engineering machinery with rope lifting requirements, and can be adapted to different equipment by changing the structure of the support 3.

[0066] In summary, the rope lifting device for a crane provided by the present invention realizes switching between a working state and a non-working state by converting the first position and the second position of the rope lifting frame 2. In the working state, the steel wire rope 6 is compressed by the friction wheel 11 and the rope pressing roller 22, and the friction wheel 11 rotates to clamp and convey the steel wire rope 6. The rope loosening and lifting are realized by adjusting the rotation direction of the friction wheel 11, and the operation is more flexible. In the non-working state, the steel wire rope 6 is released without affecting the normal lifting operation.

[0067] Furthermore, the rope lifting device for a crane provided by the present invention is provided with a plurality of rope pressing rollers 22 cooperating with the friction wheel 11 to press the steel wire rope 6, thereby increasing the wrap angle of the steel wire rope 6, thereby increasing the friction force and reducing the required pressure of the rope lifting frame driving cylinder 4.

[0068] Furthermore, the rope lifting device for a crane provided by the present invention is provided with a proximity switch 7 on the rope lifting frame 2. The proximity switch 7 confirms that the connecting shaft 27 is located at the bottom of the waist-shaped hole 14 when in the first position, and the mounting frame 1 bears the tension of the wire rope 6, thereby avoiding the situation in which the rope lifting frame drives the oil cylinder 4 to bear the tension of the wire rope 6 in the non-working state, making the operation safer and more reliable.

[0069] Furthermore, the rope lifting device for a crane provided by the present invention is provided with a strain gauge on the second ear plate 28 connected to the rope lifting frame driving cylinder 4 to detect the force applied to the second ear plate 28 during operation to prevent the force from exceeding its rated load, thereby making the operation safer and more reliable.

[0070] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even when only a single embodiment is described with respect to specific features. The feature examples provided in the present disclosure are intended to be illustrative rather than limiting, unless otherwise stated. In specific implementations, the technical features of one or more dependent claims may be combined with the technical features of the independent claim, based on actual needs and where technically feasible, and may be derived from the technical features of the corresponding independent claim in any appropriate manner rather than simply through the specific combination listed in the claims.

Claims

1. A rope lifting device for a crane, characterized in that: include: A mounting frame, used for mounting a rope lifting frame, the mounting frame is arranged on one side of a support, the support is fixedly mounted on a crane, and a friction wheel is arranged on the mounting frame; The rope lifting frame is movably connected to the mounting frame, and the rope lifting frame is provided with a pressure pulley and at least one rope pressing roller, the pressure pulley, the rope pressing roller and the friction wheel are all located on the same plane, and the steel wire rope passes through between the rope pressing roller and the friction wheel and then bypasses the pressure pulley to pass out. The rope lifting frame has a first position and a second position. When the rope lifting frame is in the first position, there is a certain distance between the rope pressing roller and the friction wheel, and the steel wire rope passing between the rope pressing roller and the friction wheel is in a free state, and the rope lifting frame is in a non-working state; when the rope lifting frame is in the second position, the rope pressing roller abuts against the friction wheel, and the steel wire rope passing between the rope pressing roller and the friction wheel is pressed against the friction wheel, and the rope lifting frame is in a working state. A driving assembly includes a rope-lifting frame driving cylinder and a friction wheel driving motor. The rope-lifting frame driving cylinder drives the rope-lifting frame to switch between a first position and a second position. The friction wheel driving motor drives the friction wheel to rotate. When the rope-lifting frame is in a working state, the friction wheel rotates to drive the steel wire rope to move, thereby achieving clamping and conveying of the steel wire rope. The mounting frame is provided with a first rotating hole at one end close to the support, the rope lifting frame has a first end and a second end, the first end of the rope lifting frame is provided with a second rotating hole, and the mounting frame and the rope lifting frame are hingedly connected via a rotating shaft passing through the first rotating hole and the second rotating hole; The cam is provided with a roller mounting hole on the upper side of the middle part of the rope lifting frame, and the rope pressing roller is arranged in the roller mounting hole and can rotate freely along the roller mounting hole, and a connecting hole is provided on the lower side of the middle part of the rope lifting frame, and a connecting shaft is provided in the connecting hole; a waist-shaped hole is provided at the lower part of the end of the mounting frame away from the support, and the connecting shaft passes through the waist-shaped hole and is connected with the telescopic end of the rope lifting frame driving cylinder, and the fixed end of the rope lifting frame driving cylinder is connected with the mounting frame, and the rope lifting frame drives the oil cylinder to extend and retract, and drives the rope lifting frame to rotate along the connecting shaft along the waist-shaped hole with the rotating shaft as the rotation center; when the connecting shaft is located at the bottom of the waist-shaped hole, the rope lifting frame is in a first position; when the rope lifting frame is in a second position, the connecting shaft is close to the top of the waist-shaped hole, and there are multiple rope pressing rollers, and the multiple rope pressing rollers are all located on the circumference with the friction wheel as the center.

2. The rope lifting device for a crane according to claim 1, characterized in that: The mounting frame is provided with a proximity switch, and the proximity switch is arranged below the waist-shaped hole. When the connecting shaft is located at the bottom of the waist-shaped hole, the proximity switch is triggered to output a first position arrival signal.

3. The rope lifting device for a crane according to claim 1, characterized in that: The mounting frame is provided with a first ear plate, which is hinged to the fixed end of the rope-lifting frame driving cylinder; the rope-lifting frame is connected to a second ear plate, which is hinged to the telescopic end of the rope-lifting frame driving cylinder through the connecting shaft; a reinforcing rib is provided on one side of the rope-lifting frame, and the second ear plate is fixedly connected to the reinforcing rib; a strain gauge is provided on the second ear plate, and the strain gauge detects the deformation amount of the second ear plate.

4. The rope lifting device for a crane according to claim 1, characterized in that: The pressure pulley is arranged at the second end of the rope lifting frame; the rope lifting frame is also provided with a rope blocking pulley, which is located obliquely above the pressure pulley. The rope blocking pulley allows the steel wire rope to pass freely between the pressure pulley and the rope blocking pulley, and blocks the steel wire rope from escaping from the pressure pulley.

5. The rope lifting device for a crane according to claim 1, characterized in that: A friction wheel mounting hole is provided at the upper part of one end of the mounting frame away from the support, and the friction wheel is mounted in the friction wheel mounting hole through the friction wheel center axis; the friction wheel driving motor is connected to the friction wheel center axis through a coupling to drive the friction wheel to rotate.

6. The rope lifting device for a crane according to claim 1, characterized in that: When the rope lifting frame is located at the second position, at least one of the rope pressing rollers abuts against the friction wheel.

7. The rope lifting device for a crane according to claim 1, characterized in that: The mounting frames are divided into two groups arranged in parallel and symmetrically, and the rope lifting frames are divided into two groups arranged corresponding to the mounting frames; the rope lifting frame driving cylinders are divided into two groups, which respectively drive the two groups of rope lifting frames to switch synchronously between the first position and the second position; the friction wheel driving motors are divided into one group, which simultaneously drives the friction wheels of the two groups of mounting frames to rotate; the friction wheel driving motors are located on the motor mounting seat, and the motor mounting seat is fixed between the two groups of mounting frames.

8. A method for operating a rope-lifting device for a crane according to any one of claims 1 to 7, characterized in that: The steps include: During the installation phase, a rope lifting frame with a rope pressing roller, a pressure pulley and a rope blocking pulley installed is provided, and the rotating shaft is passed through the first rotating hole and the second rotating hole to hinge the rope lifting frame with the mounting frame; the connecting shaft is passed through the second ear plate, the telescopic end of the rope lifting frame driving cylinder, the waist-shaped hole of the mounting frame and the connecting hole of the rope lifting frame; the fixed end of the rope lifting frame driving cylinder is hinged with the first ear plate, at which time the rope lifting frame driving cylinder is in an extended state, and the rope lifting frame is in the first position; the friction wheel driving motor is fixed to the motor mounting seat; the friction wheel is installed in the friction wheel mounting hole of the mounting frame through the friction wheel central axis, and the friction wheel driving motor is connected to the friction wheel central axis through a coupling to complete the installation; In the preparation stage, the rope lifting frame driving cylinder is driven to retract, and the rope lifting frame is driven to rotate upward to the second position along the waist-shaped hole with the rotating shaft as the rotation center along the connecting shaft, so that the steel wire rope passing between the rope pressing roller and the friction wheel is pressed against the friction wheel, and the rope lifting frame is in a working state at this time; In the operation stage, the friction wheel driving motor is driven to drive the friction wheel to rotate, and the friction force of the friction wheel is used to drive the steel wire rope to move to the required position to complete the rope lifting operation; During the operation completion stage, the rope lifting rack driving cylinder is driven to extend, driving the rope lifting rack to rotate downward to the first position along the waist-shaped hole with the rotating shaft as the rotation center along the connecting shaft, so that the rope pressing roller is separated from the friction wheel, and the steel wire rope passing between the rope pressing roller and the friction wheel is in a free state, and the rope lifting rack returns to a non-working state.

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