Winding drum rope skipping prevention mechanism

Abstract

The utility model discloses a winding drum rope skipping prevention mechanism which is arranged between a lifting winding drum and an opening and closing winding drum on a slag grabbing bucket portal crane and comprises at least two stand columns, two cross rods are hinged to the upper portion of each stand column and face the two winding drums respectively, a rope pressing rod is arranged at the tail end of each cross rod, and rope guide grooves are evenly distributed in the surface of each rope pressing rod. A limit switch is arranged on the first supporting plate of the stand column, a feeler lever in contact with the limit switch is arranged on each transverse rod, a rope guide wheel rod is fixedly connected between the second supporting plates in the same direction, a rope guide wheel is rotationally connected to the rope guide wheel rod, and a compression spring is arranged between the stand column and each transverse rod. Winding drum rope skipping prevention mechanisms of the two winding drums are integrated on the same stand column, so that the installation space is saved; through one-time pressing and two-time rope guiding, the rope skipping probability of the steel wire rope is reduced; the compression spring improves the pressing force of the rope pressing rod on the steel wire rope, and the probability of rope skipping misoperation is reduced; when the steel wire rope skips, the feeler lever is separated from the limit switch to trigger emergency braking or alarm.

Description

Technical Field

[0001] The utility model belongs to the technical field of lifting equipment, and in particular relates to a reel rope-skipping prevention mechanism. Background Art

[0002] Grab gantry cranes are widely used in ports, docks, station freight yards, mines, etc. to transfer various bulk cargoes, logs, minerals, coal, sand and gravel, earth and stone and other bulk materials. The grab and unloading actions are operated by the driver, and no auxiliary personnel are required, thus avoiding the heavy labor of the workers, saving auxiliary work time, mostly improving the loading and unloading efficiency, and reducing the occurrence of safety accidents. Grab gantry cranes are composed of electrical systems, trolleys, gantry, trolley running mechanism, grab and gantry accessories. The lifting mechanism adopts the form of two sets of drums driven by two variable frequency motors respectively. The double rope grab has a lifting support rope and an opening and closing rope, which are respectively wound on the drums of the lifting mechanism and the opening and closing mechanism. In order to make the speed of the lifting rope equal to that of the opening and closing rope, the wire rope is evenly stressed. When the drum is winding the wire rope, there is a risk of wire rope skipping. Wire rope skipping reduces the service life of the wire rope and the drum. In addition, wire rope skipping during lifting operations will cause uneven force on the hoisted object or slide after the wire rope skips during lifting, posing a safety hazard. Summary of the invention

[0003] In order to reduce the probability of tangled rope and rope skipping of the steel wire rope, the utility model provides a reel rope skipping prevention mechanism.

[0004] The purpose of the utility model is achieved in the following ways:

[0005] A drum anti-rope skipping mechanism is arranged on a slag grab gantry crane. The slag grab gantry crane includes an electrical system, a trolley, a gantry, gantry accessories, a trolley running mechanism and a grab. The trolley includes a trolley frame. A lifting drum and an opening and closing drum are arranged on the trolley frame. The lifting drum and the opening and closing drum are driven by a variable frequency motor respectively. The two variable frequency motors are connected to a reducer and a brake respectively. The grab is connected to two steel wire ropes wound on the lifting drum to control the lifting of the grab and two steel wire ropes wound on the opening and closing drum to control the opening and closing of the grab. A drum anti-rope skipping mechanism is arranged between the lifting drum and the opening and closing drum. The drum anti-rope skipping mechanism includes at least two columns. The columns are both located between the lifting drum and the opening and closing drum. A first cross bar and a second cross bar are hinged on the upper part of each column. The first cross bar faces the lifting drum, and the second cross bar faces the opening and closing drum. The first cross bar and a rope-pressing rod is arranged at the end of the second cross bar. The rope-pressing rod is located above the lifting drum or the opening and closing drum and has the same length as the lifting drum and the opening and closing drum. Rope guide grooves are evenly distributed on the surface of the rope-pressing rod, and the width of the rope guide groove is adapted to the diameter of the steel wire rope wound on the lifting drum and the opening and closing drum. A first support plate is arranged on both sides of the upper end of at least one column, a limit switch is arranged on the first support plate, and a touch rod matching the limit switch is arranged on the first cross bar and the second cross bar, and the limit switch is in continuous contact with the touch rod. A second support plate is arranged on both sides of the middle part of each column, and a guide rope wheel rod is fixedly connected between the second support plates of the same direction of multiple columns, and a guide rope wheel is rotatably connected to the guide rope wheel on the guide rope wheel rod. A compression spring is arranged between each column and the first cross bar and the second cross bar, and one end of the compression spring is connected to the first cross bar or the second cross bar, and the other end is connected to the upper part of the second support plate of the column.

[0006] The rope pressing rod is fixedly connected or rotatably connected with the first cross bar and the second cross bar.

[0007] Compared with the prior art, the utility model provides an anti-rope-slip alarm device between the lifting drum and the opening and closing drum on the trolley frame of the slag grab gantry crane, and the anti-rope-jumping mechanisms of the two drums are assembled on the same column to save installation space; the anti-rope-jumping mechanism of each drum includes a rope-pressing rod, a rope guide groove and a rope guide wheel on the surface of the rope-pressing rod, and after one compression and two rope guides, the probability of rope jumping during wire rope winding is reduced; when the wire rope jumps, the touch rod is disengaged from the limit switch, triggering emergency braking or alarm; a compression spring is provided between the column and the first cross bar and the second cross bar, which can further tighten the rope-pressing rod downward, reduce the probability of malfunction of the wire rope jumping, and increase the clamping force of the rope-pressing rod on the wire rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is the front view of the slag grab gantry crane.

[0009] Figure 2 It is a side view of a slag grab gantry crane.

[0010] Figure 3 It is a schematic diagram of the trolley of the slag grab gantry crane.

[0011] Figure 4 This is the structural diagram of the reel anti-skipping mechanism Figure 1 .

[0012] Figure 5 This is the structural diagram of the reel anti-skipping mechanism Figure 2 .

[0013] Figure 6 It is a structural schematic diagram of a rope pressure rod. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention, and are not used to limit the scope of the present invention. After reading the contents of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present invention.

[0015] like Figure 1 , Figure 2 , Figure 3 As shown in FIG. 1 , the drum anti-rope skipping mechanism is arranged on the slag grab gantry crane. The slag grab gantry crane comprises an electrical system 1, a trolley 2, a gantry 3, gantry accessories 4, a trolley running mechanism 5 and a grab 6. The gantry 3 is the main load-bearing component of the crane. It adopts a double-beam double-track structure, with the main beam, end beam, outrigger, lower crossbeam and saddle as the main load-bearing parts, supplemented by trolley tracks, platform railings, ladder platforms and other auxiliary metal structures. The cantilever side outrigger is in the form of Figure 2As shown, the width of the door leg is increased, and the cantilever side saddle frame can improve the horizontal stiffness and vertical height of the main beam. The trolley 2 includes a trolley frame, on which a lifting drum 7 and an opening and closing drum 8 are arranged. The lifting drum 7 and the opening and closing drum 8 are driven by a variable frequency motor 9 respectively. The two variable frequency motors 9 are connected to a reducer 10 and a brake 11 respectively. The grab 6 is connected with two steel wire ropes wound on the lifting drum 7 to control the lifting of the grab and two steel wire ropes wound on the opening and closing drum 8 to control the opening and closing of the grab. In order to make the speed of the steel wire rope controlling the lifting of the grab equal to that of the steel wire rope controlling the opening and closing of the grab, so that the steel wire rope is evenly stressed, the light end length of the drum and the lower rope gap of the grab are kept consistent. When the grab is opened, the steel wire rope controlling the lifting of the grab and the steel wire rope controlling the opening and closing of the grab are simultaneously lowered to the appropriate position, and then the lifting and lowering stop, the opening and closing continue to descend, and the grab gradually opens to complete the opening action. When the grab bucket is closed, the opening and closing drum 8 performs a lifting operation, the upper pulley block of the grab bucket does not move, and the lower pulley block moves upward. When the grab bucket grab teeth cross and collide with each other, the closing action of the grab bucket is completed. During the closing process, the lifting drum 7 performs appropriate lifting operations to prevent the lifting wire rope from sagging. A drum anti-rope skipping mechanism 20 is set between the lifting drum 7 and the opening and closing drum 8. Figure 4 , Figure 5 , Figure 6 As shown, the drum anti-rope skipping mechanism 20 includes at least two columns 21, and the columns 21 are connected to the trolley frame through a connecting plate and bolts, which are convenient for disassembly and transportation. The columns 21 are located between the lifting drum 7 and the opening and closing drum 8. The upper part of each column 21 is hinged with a first cross bar 22 and a second cross bar 23. The first cross bar 22 faces the lifting drum 7, and the second cross bar 23 faces the opening and closing drum 8. A rope pressing rod 24 is arranged at the end of the first cross bar 22 and the second cross bar 23. The rope pressing rod 24 can be fixedly connected to the first cross bar 22 and the second cross bar 23, and can also be rotatably connected. The rope pressing rod 24 is located above the lifting drum 7 or the opening and closing drum 8, and has the same length as the lifting drum 7 and the opening and closing drum 8. Rope guide grooves 25 are evenly distributed on the surface of the rope pressing rod 24, and the width of the rope guide grooves 25 is the same as that of the lifting drum 7 and the opening and closing drum. The diameter of the wire rope wound on the drum 8 is adapted; a first support plate 26 is arranged on both sides of the upper end of at least one column 21, a limit switch 27 is arranged on the first support plate 26, and a touch rod 28 cooperating with the limit switch 27 is arranged on the first cross bar 22 and the second cross bar 23, and the limit switch 27 is in continuous contact with the touch rod 28; a second support plate 29 is arranged on both sides of the middle part of each column 21, and a guide rope wheel rod 30 is fixedly connected between the second support plates 29 of multiple columns in the same direction, and the guide rope wheel rod 30 is rotatably connected to the guide rope wheel 31, which is a pulley; a compression spring 32 is arranged between each column 21 and the first cross bar 22 and the second cross bar 23, one end of the compression spring 32 is connected to the first cross bar 22 or the second cross bar 23, and the other end is connected to the upper part of the second support plate 29 of the column 21.

[0016] The hoisting drum 7 or the opening and closing drum 8 rotates under the drive of the respective variable frequency motor and the reducer, and the steel wire rope is wound around the surface of the hoisting drum 7 or the opening and closing drum 8. The steel wire rope is tightly wound around the hoisting drum 7 or the opening and closing drum 8 under the guidance of the rope guide groove 25 on the surface of the rope pressing rod 24. The rope pressing rod 24 has both a pressing effect and a rope guiding effect on the steel wire rope on the surface of the hoisting drum 7 or the opening and closing drum 8, ensuring that the steel wire rope is wound on the hoisting drum 7 or the opening and closing drum 8 in an orderly and tight manner.

[0017] A limit switch 27 is provided on the first support plate 26, and a touch rod 28 cooperating with the limit switch 27 is provided on the first cross bar 22 and the second cross bar 23. When the wire rope still jumps under the compression of the rope pressing rod 24 and the guiding of the rope guide groove 25, due to the heavy weight of the material grabbed by the slag grab gantry crane, the bouncing force of the corresponding wire rope is very large, which will bounce the first cross bar 22 and the second cross bar 23, so that the touch rod 28 on the first cross bar 22 and the second cross bar 23 is disengaged from the limit switch 27, and the limit switch 27 is connected to the braking system, the brake 11 on the trolley frame is braked, the lifting drum 7 or the opening and closing drum 8 stops rotating, or the limit switch 27 feeds back the sensed signal to the staff in the driver's room for manual intervention.

[0018] A guide rope wheel rod 30 is fixedly connected between the second support plates 29 of the same orientation of the plurality of columns, and a guide rope wheel 31 is rotatably connected to the guide rope wheel rod 30, and the guide rope wheel is a pulley. When the wire rope is wound on the surface of the lifting drum 7 or the opening and closing drum 8, it first contacts the guide rope wheel 31, and the guide rope wheel 31 moves left and right on the guide rope wheel rod 30 driven by the wire rope to adapt to the winding of the wire rope in the entire drum length direction, and after the primary guidance of the guide rope wheel 31, and then the compression and secondary guidance of the rope pressing rod 24, the probability of the wire rope being disordered and skipping can be reduced.

[0019] A compression spring 32 is arranged between each upright post 21 and the first cross bar 22 and the second cross bar 23, which can further tighten the rope pressing rod 24 downward, reduce the probability of malfunction of wire rope skipping and increase the pressing force of the rope pressing rod 24 on the wire rope.

[0020] The above is only a preferred embodiment of the present invention. It should be pointed out that, for those skilled in the art, several changes and improvements can be made without departing from the overall concept of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims

1. The reel anti-rope skipping mechanism is characterized by: The slag crushing grab gantry crane comprises an electrical system (1), a trolley (2), a gantry (3), gantry accessories (4), a trolley running mechanism (5) and a grab bucket (6). The trolley (2) comprises a trolley frame, a lifting drum (7) and an opening and closing drum (8) are arranged on the trolley frame, the lifting drum (7) and the opening and closing drum (8) are respectively driven by a variable frequency motor (9), the two variable frequency motors (9) are respectively connected to a reducer (10) and a brake (11), and the grab bucket (6) is connected to two steel wire ropes wound on the lifting drum (7) for controlling the lifting of the grab bucket and two steel wire ropes wound around an opening and closing drum (8) for controlling the opening and closing of the grab bucket; a drum anti-rope-jumping mechanism is arranged between the lifting drum (7) and the opening and closing drum (8); the drum anti-rope-jumping mechanism comprises at least two columns (21); the columns (21) are located between the lifting drum (7) and the opening and closing drum (8); a first cross bar (22) and a second cross bar (23) are hingedly connected to the upper part of each column (21); the first cross bar (22) faces the lifting drum (7); the second cross bar (23) faces the opening and closing drum (8); rope pressing rods (24) are arranged at the ends of the first cross bar (22) and the second cross bar (23); The rope pressing rod (24) is located above the lifting drum (7) or the opening and closing drum (8) and has the same length as the lifting drum (7) and the opening and closing drum (8). The rope guiding grooves (25) are evenly distributed on the surface of the rope pressing rod (24). The width of the rope guiding grooves (25) is adapted to the diameter of the steel wire rope wound on the lifting drum (7) and the opening and closing drum (8). A first support plate (26) is provided on both sides of the upper end of at least one column (21). A limit switch (27) is provided on the first support plate (26). A touch rod (28) matching with the limit switch (27) is provided on the first cross bar (22) and the second cross bar (23). ), the limit switch (27) is in continuous contact with the touch rod (28); second support plates (29) are respectively arranged on both sides of the middle of each column (21); a guide rope wheel rod (30) is fixedly connected between the second support plates (29) of the plurality of columns in the same direction; the guide rope wheel rod (30) is rotatably connected to the guide rope wheel (31); a compression spring (32) is arranged between each column (21) and the first cross bar (22) and the second cross bar (23); one end of the compression spring (32) is connected to the first cross bar (22) or the second cross bar (23), and the other end is connected to the upper part of the second support plate (29) of the column (21).

2. The reel anti-rope skipping mechanism according to claim 1, characterized in that: The rope pressing rod (24) is fixedly connected or rotationally connected to the first cross bar (22) and the second cross bar (23).

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