Mechanical device for preventing drum steel wire rope of grab crane from disengaging from groove

Abstract

The utility model discloses a mechanical device for preventing a drum steel wire rope of a grab crane from disengaging from a groove, which comprises a groove-disengaging-preventing rack positioned between two drums, two blocking rollers are arranged on the groove-disengaging-preventing rack, the axes of the blocking rollers are lower than the wire outlet end of the steel wire rope, and the two blocking rollers respectively block the steel wire rope on one drum; two buffering rollers are arranged on the groove-disengaging-preventing machine frame, the axes of the buffering rollers are higher than the wire outlet ends of the steel wire ropes, and the two buffering rollers block the steel wire ropes on the winding drums respectively. The device disclosed by the utility model is light in structure, can be conveniently mounted between two winding drums of the grab crane, is convenient to disassemble, and is beneficial to maintenance and replacement. Meanwhile, aiming at the characteristics of the grab bucket crane under the working conditions of swinging, vibration, impact and the like, a double-insurance structure of one buffering and one blocking is adopted, the steel wire ropes of the two winding drums can be reliably prevented from disengaging from the groove, safety accidents are avoided, and therefore the requirement for preventing the steel wire ropes of the double winding drums of the grab bucket crane from disengaging from the groove can be met.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, and in particular to a mechanical device for preventing the wire rope of a grab crane drum from derailing. Background Technology

[0002] A grab crane, also known as a grab hoist, is a lifting machine equipped with a grab bucket. It is widely used in ports, docks, railway freight yards, mines, and other locations for loading various bulk cargoes, logs, minerals, coal, sand and gravel, earthwork, etc. Mechanical grab buckets do not have an opening and closing mechanism themselves; they are typically driven by external force through ropes or linkages. Based on operating characteristics, they can be divided into double-rope grab buckets and single-rope grab buckets, with double-rope grab buckets being the most common. Double-rope grab buckets have a support rope and an opening / closing rope, which are wound on the drums of the support mechanism and the opening / closing mechanism, respectively. For example... Figure 1 As shown, two drums are mounted opposite each other on the support platform of the trolley. The wire ropes, serving as support ropes and opening / closing ropes, are wound in the rope grooves of the two drums and pass through the platform's cable grooves before connecting to the grab mechanism. Under the combined effects of swaying and crane vibration, the wire ropes are prone to detaching from the drum rope grooves, causing equipment damage or even safety accidents. To address this problem, existing cranes mainly employ two protection methods: one is using an integrated protective cover, and the other is using a rope guide. The traditional integrated protective cover structure is relatively bulky, making equipment installation and maintenance inconvenient; the grab crane's transmission mechanism is compact, and the distance between the two drums is small, making it unsuitable to install a rope guide. Therefore, an anti-detachment device needs to be designed to meet the protection requirements of the grab crane. Utility Model Content

[0003] This utility model provides a mechanical device to prevent the wire rope of a grab crane drum from derailing, in order to solve the above-mentioned technical problems.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A mechanical device for preventing wire rope from derailing on a grab crane drum includes an anti-derailment frame located between two drums of the grab crane. Two anti-derailment rollers are detachably and rotatably connected to the anti-derailment frame. The axis of the anti-derailment rollers is lower than the lead-out end of the wire rope on the drum, and the two anti-derailment rollers respectively block the wire rope on one drum. Two buffer rollers are detachably and rotatably connected to the anti-derailment frame. The axis of the buffer rollers is higher than the lead-out end of the wire rope on the drum, and the two buffer rollers respectively block the wire rope on one drum.

[0006] Both ends of the buffer roller are mounted on the anti-detachment frame via buffer assemblies; when the buffer roller is impacted by the wire rope, the buffer assemblies are compressed to float and support the buffer roller; when the wire rope detaches from the buffer roller, the buffer assemblies are extended to push the buffer roller back to its original position.

[0007] Preferably, the impact drum is tangent to the wire rope or the distance between the impact drum and the wire rope is no more than 1 mm;

[0008] The buffer drum is tangent to the wire rope, or the distance between the buffer drum and the wire rope is no more than 1mm.

[0009] Preferably, the buffer assembly includes: a spring support seat, an elastic bearing base, a spring support column, a spring locking nut, and a spring; the spring support seat is detachably connected to the anti-slip frame, the elastic bearing base is located on the side of the spring support seat facing the drum, the end of the buffer roller is rotatably connected to the elastic bearing base, one end of the spring support column is fixed on the elastic bearing base, and the other end passes through the spring support seat and is threadedly connected to the spring locking nut, the spring is sleeved on the spring support column, one end of the spring abuts against the elastic bearing base, and the other end abuts against the spring support seat.

[0010] Preferably, the spring support is also provided with a proximity switch, which is used to detect the distance between the elastic bearing base and the spring support.

[0011] Preferably, the spring support base includes: a spring mounting base plate, a first connecting support plate, a spring mounting inclined plate, and a second connecting support plate; the first connecting support plate is vertically fixed on the spring mounting base plate, the spring mounting inclined plate is fixed on the first connecting support plate and located on the side of the first connecting support plate facing the drum, the included angle between the spring mounting inclined plate and the first connecting support plate is 135°, and there are two second connecting support plates, which are located at both ends of the first connecting support plate and are fixedly connected to the spring mounting base plate, the first connecting support plate, and the spring mounting inclined plate.

[0012] Preferably, the anti-slip roller includes an anti-slip roller shaft and an anti-slip baffle. The two ends of the anti-slip roller shaft extend through the anti-slip baffle and are installed on the anti-slip frame. The anti-slip baffle is made of wear-resistant material.

[0013] The buffer roller includes a buffer roller shaft and a buffer baffle. The two ends of the buffer roller shaft pass through the buffer baffle and are installed on the anti-slip frame. The buffer baffle is made of wear-resistant material.

[0014] Preferably, the anti-scraping frame includes: a bottom crossbeam, a top crossbeam, and frame columns. The bottom crossbeam is used to be installed on the support platform of the grab crane. There are at least two frame columns, with one end of each column connected to the bottom crossbeam and the other end supporting the top crossbeam. Two impact-blocking cylinders are respectively installed on both sides of the bottom crossbeam, and two buffer rollers are installed on the upper surface of the top crossbeam.

[0015] Preferably, the frame bottom crossbeam includes: a bottom crossbeam mounting base plate, a bottom crossbeam upright plate, and a bottom crossbeam mounting top plate; the bottom crossbeam mounting base plate is mounted on a support platform, the bottom crossbeam mounting top plate is positioned opposite to the bottom crossbeam mounting base plate, and the bottom crossbeam upright plate is vertically fixed between the bottom crossbeam mounting base plate and the bottom crossbeam mounting top plate; the bottom crossbeam upright plate has two sets of first mounting through holes along its length, and first bearing seats are installed at both ends of the impact rollers, the first bearing seats being fixedly connected to the bottom crossbeam upright plate through first fasteners and first mounting through holes; the first bearing seats at the same end of the two impact rollers are installed through different first mounting through holes;

[0016] The top crossbeam of the frame includes a top crossbeam mounting plate and a top crossbeam upright plate; the top crossbeam mounting plate is mounted on the frame column, and the top crossbeam upright plate is vertically fixed to both sides of the lower surface of the top crossbeam mounting plate; the top crossbeam mounting plate has two sets of second mounting through holes along its length, and the two ends of the buffer roller are equipped with second bearing seats, which are mounted on the buffer assembly. The buffer assembly is fixedly connected to the top crossbeam mounting plate through the second fasteners and the second mounting through holes.

[0017] Preferably, the frame column includes an upper column and a lower column. The upper end of the upper column is fixed to the top crossbeam mounting plate, and the upper end of the lower column is fixed to the bottom crossbeam mounting plate. The upper column is provided with a set of third mounting through holes, and the lower column is provided with a set of column elongated holes corresponding to the third mounting through holes. The length direction of the column elongated holes is set along the length direction of the lower column. The lower column and the upper column are detachably and fixedly connected through a set of third mounting through holes, a set of column elongated holes, and a set of third fasteners.

[0018] Beneficial effects:

[0019] This application discloses a mechanical device for preventing wire rope derailment from the drums of a grab crane. This device uses an anti-derailment frame between the two drums, and two impact rollers and two buffer rollers mounted on the frame. The buffer rollers block the wire rope above its lead-out end, while the impact rollers block it below. The device is lightweight and easy to install between the two drums of the grab crane. It is also easy to disassemble, facilitating maintenance and replacement. Furthermore, considering the characteristics of grab cranes under swaying, vibration, and impact conditions, this application employs a double-safety structure with one buffer and one impact roller, reliably preventing the wire rope from derailing from both drums and avoiding safety accidents. Therefore, this application meets the requirements for preventing wire rope derailment from double drums in grab cranes. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a dual-drum grab crane.

[0022] Figure 2 This is an installation diagram of a mechanical device for preventing the wire rope of a grab crane drum from derailing, as disclosed in this utility model.

[0023] Figure 3 This is an installation side view of a mechanical device for preventing the wire rope of a grab crane drum from derailing, as disclosed in this utility model.

[0024] Figure 4 This is a top view of the installation of a mechanical device for preventing the wire rope of a grab crane drum from derailing, as disclosed in this utility model.

[0025] Figure 5 This utility model discloses a structural schematic diagram of a mechanical device for preventing the wire rope of a grab crane drum from derailing. Figure 1 ;

[0026] Figure 6 This utility model discloses a structural schematic diagram of a mechanical device for preventing the wire rope of a grab crane drum from derailing. Figure 2 ;

[0027] Figure 7 This is a front view of a mechanical device for preventing the wire rope of a grab crane drum from derailing, as disclosed in this utility model.

[0028] Figure 8 This is a top view of a mechanical device for preventing the wire rope of a grab crane drum from derailing, as disclosed in this utility model.

[0029] Figure 9 This utility model discloses a structural diagram showing the second bearing seat of a mechanical device for preventing the wire rope of a grab crane drum from derailing, installed in a buffer assembly. Figure 1 ;

[0030] Figure 10 This utility model discloses a structural diagram showing the second bearing seat of a mechanical device for preventing the wire rope of a grab crane drum from derailing, installed in a buffer assembly. Figure 2 ;

[0031] Figure 11This is a schematic diagram of the spring support seat of a mechanical device for preventing the wire rope of a grab crane drum from derailing, as disclosed in this utility model.

[0032] In the diagram: 11. Drum; 12. Support platform; 121. Platform cable tray; 13. Wire rope; 21. Bottom crossbeam of the frame; 211. Bottom crossbeam mounting plate; 212. Bottom crossbeam upright plate; 2121. First mounting through hole; 213. Bottom crossbeam mounting top plate; 22. Top crossbeam of the frame; 221. Top crossbeam mounting plate; 2211. Second mounting through hole; 222. Top crossbeam upright plate; 23. Frame column; 231. Upper column; 232. Lower column; 2321. Column strip 24. Hole; 3. Frame base; 4. Impact roller; 52. Impact stop cylinder; 33. First bearing seat; 34. Shaft top cover; 55. Buffer roller; 46. Buffer stop cylinder; 47. Second bearing seat; 58. Spring support seat; 59. Spring mounting base plate; 50. First connecting support plate; 51. Spring mounting inclined plate; 52. Second connecting support plate; 53. Elastic bearing base; 54. Spring support column; 55. Spring locking nut; 56. Spring; 57. Proximity switch. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] A mechanical device for preventing the wire rope of a grab crane drum from slipping off the groove, combined with Figures 1-11As shown, the device includes an anti-derailment frame located between two drums 11 of a grab crane. Two impact rollers 3 are detachably and rotatably connected to the anti-derailment frame. The axis of the impact rollers 3 is lower than the lead-out end of the wire rope 13 on the drum 11, and the two impact rollers 3 respectively block the wire rope 13 on one drum 11. Two buffer rollers 4 are detachably and rotatably connected to the anti-derailment frame. The axis of the buffer rollers 4 is higher than the lead-out end of the wire rope 13 on the drum 11, and the two buffer rollers 4 respectively block the wire rope 13 on one drum 11. This application achieves the functions of blocking the wire rope 13 above the lead-out end of the wire rope 13 using the two buffer rollers 4 and blocking the wire rope 13 below the lead-out end of the wire rope 13 by setting an anti-derailment frame between the two drums 11 and installing two impact rollers 3 and two buffer rollers 4 on the anti-derailment frame. The device structure of this application is lightweight, easy to install between the two drums 11 of the grab crane, and easy to disassemble, facilitating maintenance and replacement. Meanwhile, considering the characteristics of grab cranes under swinging, vibration and impact conditions, this application adopts a double insurance structure with one buffer and one blocking, which can reliably prevent the wire ropes 13 of the two drums 11 from derailing and avoid safety accidents. Therefore, this application can meet the wire rope derailment prevention requirements of the double drums of grab cranes.

[0035] Preferably, the impact drum 3 is tangent to the wire rope 13 or the distance between the impact drum 3 and the wire rope 13 is no more than 1 mm;

[0036] The buffer drum 4 is tangent to the wire rope 13, or the distance between the buffer drum 4 and the wire rope 13 is no more than 1 mm. When the wire rope 13 tends to jump off the groove, the buffer drum 4 first acts as a buffer to absorb the impact force, and the blocking drum 3 acts as a blocking drum to stop the wire rope 13. The blocking drum 3 and the buffer drum 4 limit the wire rope 13 from both above and below the exit end of the wire rope 13, which can reliably prevent the wire rope 13 from derailing.

[0037] Preferably, both ends of the buffer drum 4 are mounted on the anti-derailment frame via buffer assemblies; when the buffer drum 4 is impacted by the wire rope 13, the buffer assemblies compress to float and support the buffer drum 4; when the wire rope 13 detaches from the buffer drum 4, the buffer assemblies extend to push the buffer drum 4 back to its original position. After being impacted, the buffer drum 4 absorbs energy through the buffer assemblies to reduce the impact force above the wire rope 13's outlet end, thereby ensuring the interaction between the wire rope 13 and the rope groove of the drum 11.

[0038] Preferably, the buffer assembly includes: a spring support seat 51, an elastic bearing base 52, a spring support column 53, a spring locking nut 54, and a spring 55. The spring support seat 51 is detachably connected to the anti-slip frame. The elastic bearing base 52 is located on the side of the spring support seat 51 facing the drum 11. The end of the buffer roller 4 is rotatably connected to the elastic bearing base 52. One end of the spring support column 53 is fixed to the elastic bearing base 52, and the other end passes through the spring support seat 51 and is threadedly connected to the spring locking nut 54. The spring 55 is sleeved on the spring support column 53, with one end abutting against the elastic bearing base 52 and the other end abutting against the spring support seat 51. When the wire rope 13 squeezes the buffer roller 4, the elastic bearing base 52 compresses the spring 55, causing the elastic bearing base 52 to move closer to the spring support seat 51, thereby allowing the position of the buffer roller 4 to float automatically.

[0039] Specifically, the buffer roller 4 is located diagonally above the drum 11, and the spring support column 53 is arranged radially along the drum 11 so that the force on the buffer roller 4 is transmitted axially along the spring 55.

[0040] Preferably, the spring support 51 is also equipped with a proximity switch 56. The proximity switch 56 is used to detect the distance between the elastic bearing base 52 and the spring support 51, so that it can detect delamination by changing the distance and provide a detection signal to remind the grab crane operator to stop the machine in time. In this embodiment, the spring support 51 is provided with an elongated hole, and the proximity switch 56 is installed through a nut and the elongated hole. The distance between the end face of the proximity switch 56 and the end face of the fixing screw on the elastic bearing base 52 is adjusted to between 21mm and 25mm. When an abnormal delamination occurs, the distance between the end face of the proximity switch 56 and the end face of the fixing screw on the elastic bearing base 52 is less than 20mm. At this time, the proximity switch is activated, and the detection signal is transmitted to the operator. It can also be interlocked with the grab crane control system to control the timely stop.

[0041] Preferably, the spring support base 51 includes: a spring mounting base plate 511, a first connecting support plate 512, a spring mounting inclined plate 513, and a second connecting support plate 514. The first connecting support plate 512 is vertically fixed on the spring mounting base plate 511. The spring mounting inclined plate 513 is fixed on the first connecting support plate 512 and located on the side of the first connecting support plate 512 facing the drum 11. The angle between the spring mounting inclined plate 513 and the first connecting support plate 512 is 135°. There are two second connecting support plates 514, located at both ends of the first connecting support plate 512, and both second connecting support plates 514 are fixedly connected to the spring mounting base plate 511, the first connecting support plate 512, and the spring mounting inclined plate 513. The spring support base 51 can satisfy the installation angle while ensuring rigidity and convenient installation.

[0042] Preferably, the anti-slip roller 3 includes an anti-slip roller shaft and an anti-slip baffle 32. The two ends of the anti-slip roller shaft pass through the anti-slip baffle 32 and are installed on the anti-slip frame. The anti-slip baffle 32 is made of wear-resistant material.

[0043] The buffer roller 4 includes a buffer roller shaft and a buffer baffle 42. Both ends of the buffer roller shaft extend through the buffer baffle 42 and are mounted on the anti-derailment frame. The buffer baffle 42 is made of wear-resistant material. The roller moves with the wire rope 13 through the rolling friction between the baffle 32 and the buffer baffle 42, thus blocking the wire rope 13 and preventing it from derailing. In this embodiment, the baffle 32 and the buffer baffle 42 can be made of nylon tubing, which allows for easy purchase and replacement.

[0044] Preferably, the anti-scraping frame includes: a bottom crossbeam 21, a top crossbeam 22, and frame columns 23. The bottom crossbeam 21 is installed on the support platform 12 of the grab crane. There are at least two frame columns 23, with one end of each column connected to the bottom crossbeam 21 and the other end supporting the top crossbeam 22. Two impact-blocking cylinders 32 are respectively disposed on both sides of the bottom crossbeam 21, and two buffer rollers 4 are disposed on the upper surface of the top crossbeam 22. The anti-scraping frame of this application has a narrower dimension in the portion between the two drums 11, which can accommodate the compact space between the two drums 11. At the same time, the top crossbeam 22 is located in the upper part between the two drums 11, utilizing this space to install a wider buffer assembly and buffer rollers 4.

[0045] Specifically, the spring mounting base plate 511 of the spring support seat 51 is provided with an elongated hole, which is fixed to the top crossbeam 22 of the anti-scraping frame by screws, so as to adjust the length of the spring support seat 51 extending out of the top crossbeam 22 of the frame.

[0046] Preferably, the frame bottom crossbeam 21 includes: a bottom crossbeam mounting base plate 211, a bottom crossbeam upright plate 212, and a bottom crossbeam mounting top plate 213; the bottom crossbeam mounting base plate 211 is mounted on the support platform 12, the bottom crossbeam mounting top plate 213 is arranged opposite to the bottom crossbeam mounting base plate 211, and the bottom crossbeam upright plate 212 is vertically fixed between the bottom crossbeam mounting base plate 211 and the bottom crossbeam mounting top plate 213; the bottom crossbeam upright plate 212 has two sets of first mounting through holes 2121 along its length, and first bearing seats 33 are installed at both ends of the impact roller 3, and the first bearing seats 33 are fixedly connected to the bottom crossbeam upright plate 212 through first fasteners and first mounting through holes 2121; the first bearing seats 33 at the same end of the two impact rollers 3 are installed through different first mounting through holes 2121. The force on the impact baffle 32 acts on the bottom crossbeam upright plate 212, and the forces on the two can cancel each other out, which is beneficial to improving the structural rigidity.

[0047] The frame top crossbeam 22 includes a top crossbeam mounting plate 221 and a top crossbeam upright plate 222. The top crossbeam mounting plate 221 is mounted on the frame column 23, and the top crossbeam upright plate 222 is vertically fixed to both sides of the lower surface of the top crossbeam mounting plate 221. The top crossbeam mounting plate 221 has two sets of second mounting through holes 2211 along its length. Second bearing seats 43 are installed at both ends of the buffer roller 4. The second bearing seats 43 are mounted on the buffer assembly, and the buffer assembly is fixedly connected to the top crossbeam mounting plate 221 through second fasteners and second mounting through holes 2211. The frame top crossbeam 22 of this application can ensure structural rigidity and cooperate with the buffer assembly to make the buffer roller 4 arranged radially along the drum 11.

[0048] Specifically, the bottom beam mounting plate 211 is fixed to the two frame bases 24 through elongated holes and screws, thus spanning the platform cable tray 121. The two frame bases 24 are fixed to the support platform 12 by welding. After the frame bases 24 are initially installed, the anti-detachment frame can be easily disassembled and installed; and the position can be accurately fine-tuned during installation to ensure the anti-detachment effect.

[0049] Specifically, each group of first mounting through holes 2121 includes two rows of first mounting through holes 2121, and the corresponding first mounting through holes 2121 can be selected according to the required position to install the first bearing seat 33. Furthermore, when the first bearing seats 33 at the same end of the impact rollers 3 on both sides of the bottom crossbeam upright plate 212 are installed, they correspond to different first mounting through holes 2121 to avoid the first fasteners from loosening due to the use of a common first fastener.

[0050] In this embodiment, the impact-blocking roller 3 has two impact-blocking baffles 32 on its impact-blocking roller bushing, and a first bearing seat 33 is added between the two impact-blocking baffles 32 for support. At the same time, the shaft top cover 34 is fixedly connected to both ends of the impact-blocking roller shaft with screws to limit the axial position.

[0051] Specifically, each group of second mounting through holes 2211 includes two rows of second mounting through holes 2211, and the spring support seats 51 of the two buffer rollers 4 correspond to one row of second mounting through holes 2211 in each group of second mounting through holes 2211; and the corresponding second mounting through holes 2211 can be selected according to the required position to install the spring support seat 51.

[0052] Preferably, the frame column 23 includes an upper column 231 and a lower column 232. The upper end of the upper column 231 is fixed to the top crossbeam mounting plate 221, and the upper end of the lower column 232 is fixed to the bottom crossbeam mounting plate 213. The upper column 231 is provided with a set of third mounting through holes, and the lower column 232 is provided with a set of column elongated holes 2321 corresponding to the third mounting through holes. The length direction of the column elongated holes 2321 is set along the length direction of the lower column 232. The lower column 232 and the upper column 231 are detachably and fixedly connected by a set of third mounting through holes, a set of column elongated holes 2321, and a set of third fasteners. The height of the upper column 231 is adjusted by the cooperation of the column elongated holes 2321 and the third fasteners. In this embodiment, the first fastener, the second fastener, and the third fastener can all be connected by bolt assemblies.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A mechanical device for preventing the wire rope of a grab crane drum from derailing, characterized in that, The system includes an anti-derailment frame located between two drums (11) of a grab crane. Two impact rollers (3) are detachably and rotatably connected to the anti-derailment frame. The axis of the impact rollers (3) is lower than the outlet end of the wire rope (13) on the drum (11). The two impact rollers (3) respectively block the wire rope (13) on one drum (11). Two buffer rollers (4) are detachably and rotatably connected to the anti-derailment frame. The axis of the buffer rollers (4) is higher than the outlet end of the wire rope (13) on the drum (11). The two buffer rollers (4) respectively block the wire rope (13) on one drum (11). The two ends of the buffer roller (4) are mounted on the anti-slip frame through buffer components; when the buffer roller (4) is impacted by the wire rope (13), the buffer components are compressed to float and support the buffer roller (4); when the wire rope (13) is detached from the buffer roller (4), the buffer components are extended to push the buffer roller (4) to reset.

2. The mechanical device for preventing the wire rope of a grab crane drum from derailing according to claim 1, characterized in that, The impact-blocking drum (3) is tangent to the wire rope (13) or the distance between the impact-blocking drum (3) and the wire rope (13) is not greater than 1mm; The buffer roller (4) is tangent to the wire rope (13) or the distance between the buffer roller (4) and the wire rope (13) is no greater than 1 mm.

3. The mechanical device for preventing the wire rope of a grab crane drum from derailing according to claim 2, characterized in that, The buffer assembly includes: a spring support seat (51), an elastic bearing base (52), a spring support column (53), a spring locking nut (54), and a spring (55); the spring support seat (51) is detachably connected to the anti-slip frame, the elastic bearing base (52) is located on the side of the spring support seat (51) facing the drum (11), the end of the buffer roller (4) is rotatably connected to the elastic bearing base (52), one end of the spring support column (53) is fixed on the elastic bearing base (52), and the other end passes through the spring support seat (51) and is threadedly connected to the spring locking nut (54), the spring (55) is sleeved on the spring support column (53), one end of the spring (55) abuts against the elastic bearing base (52), and the other end abuts against the spring support seat (51).

4. The mechanical device for preventing the wire rope of a grab crane drum from derailing according to claim 3, characterized in that, The spring support base (51) is also provided with a proximity switch (56), which is used to detect the distance between the elastic bearing base (52) and the spring support base (51).

5. The mechanical device for preventing the wire rope of a grab crane drum from derailing according to claim 3, characterized in that, The spring support base (51) includes: a spring mounting base plate (511), a first connecting support plate (512), a spring mounting inclined plate (513), and a second connecting support plate (514); the first connecting support plate (512) is vertically fixed on the spring mounting base plate (511), the spring mounting inclined plate (513) is fixed on the first connecting support plate (512) and located on the side of the first connecting support plate (512) facing the drum (11), the angle between the spring mounting inclined plate (513) and the first connecting support plate (512) is 135°, and there are two second connecting support plates (514), the two second connecting support plates (514) are located at both ends of the first connecting support plate (512), and the second connecting support plates (514) are fixedly connected to the spring mounting base plate (511), the first connecting support plate (512), and the spring mounting inclined plate (513).

6. A mechanical device for preventing the wire rope of a grab crane drum from derailing according to any one of claims 1-5, characterized in that, The anti-slip roller (3) includes an anti-slip roller shaft and an anti-slip baffle (32). The anti-slip roller shaft is installed on the anti-slip frame after both ends pass through the anti-slip baffle (32). The anti-slip baffle (32) is made of wear-resistant material. The buffer roller (4) includes a buffer roller shaft and a buffer baffle (42). The buffer roller shaft extends through the buffer baffle (42) at both ends and is installed on the anti-slip frame. The buffer baffle (42) is made of wear-resistant material.

7. The mechanical device for preventing the wire rope of a grab crane drum from derailing according to claim 6, characterized in that, The anti-scraping frame includes: a bottom crossbeam (21), a top crossbeam (22), and frame columns (23). The bottom crossbeam (21) is used to be installed on the support platform (12) of the grab crane. There are at least two frame columns (23). One end of each of the two frame columns (23) is connected to the bottom crossbeam (21), and the other end of the two frame columns (23) supports the top crossbeam (22). Two impact baffles (32) are respectively set on both sides of the bottom crossbeam (21), and two buffer rollers (4) are set on the upper surface of the top crossbeam (22).

8. The mechanical device for preventing the wire rope of a grab crane drum from derailing according to claim 7, characterized in that, The frame bottom crossbeam (21) includes: a bottom crossbeam mounting base plate (211), a bottom crossbeam upright plate (212), and a bottom crossbeam mounting top plate (213); the bottom crossbeam mounting base plate (211) is mounted on the support platform (12), the bottom crossbeam mounting top plate (213) is arranged opposite to the bottom crossbeam mounting base plate (211), and the bottom crossbeam upright plate (212) is vertically fixed between the bottom crossbeam mounting base plate (211) and the bottom crossbeam mounting top plate (213); The bottom crossbeam upright plate (212) has two sets of first mounting through holes (2121) along its length. The two ends of the impact roller (3) are equipped with first bearing seats (33). The first bearing seats (33) are fixedly connected to the bottom crossbeam upright plate (212) by first fasteners and first mounting through holes (2121). The first bearing seats (33) at the same end of the two impact rollers (3) are installed through different first mounting through holes (2121). The top crossbeam (22) of the frame includes a top crossbeam mounting plate (221) and a top crossbeam upright plate (222); the top crossbeam mounting plate (221) is mounted on the frame column (23), and the top crossbeam upright plate (222) is vertically fixed on both sides of the lower surface of the top crossbeam mounting plate (221); the top crossbeam mounting plate (221) has two sets of second mounting through holes (2211) along its length direction, and the buffer roller (4) has second bearing seats (43) installed at both ends. The second bearing seats (43) are mounted on the buffer assembly, and the buffer assembly is fixedly connected to the top crossbeam mounting plate (221) by the second fastener and the second mounting through holes (2211).

9. A mechanical device for preventing the wire rope of a grab crane drum from derailing according to claim 8, characterized in that, The frame column (23) includes an upper column (231) and a lower column (232). The upper end of the upper column (231) is fixed on the top crossbeam mounting plate (221), and the upper end of the lower column (232) is fixed on the bottom crossbeam mounting plate (213). The upper column (231) is provided with a set of third mounting through holes, and the lower column (232) is provided with a set of column elongated holes (2321) corresponding to the third mounting through holes. The length direction of the column elongated holes (2321) is set along the length direction of the lower column (232). The lower column (232) and the upper column (231) are detachably and fixedly connected by a set of third mounting through holes, a set of column elongated holes (2321), and a set of third fasteners.

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