Double-beam grab bridge crane

Abstract

The utility model relates to the technical field of cranes, and provides a double-beam grab bridge crane which comprises a double-beam guide rail, a travelling crane driving device is arranged on the double-beam guide rail in a sliding mode, a grab unit is arranged below the travelling crane driving device, the grab unit comprises an upper supporting plate, supporting arms are hinged to the two ends of the upper supporting plate, and grab buckets are hinged to the lower ends of the supporting arms. A lifting plate is arranged below the upper supporting plate, a mounting cover is arranged above the lifting plate, a sliding wheel is mounted in the mounting cover, a pulley block is arranged below the upper supporting plate, and a cable is wound between the pulley block and the sliding wheel; the sliding wheel comprises five rotating discs, and a pushing unit is arranged between every two adjacent rotating discs. When the winch for controlling the opening and closing rope fails or the opening and closing rope is broken accidentally, the lifting plate can descend rapidly, the cable drives the sliding wheel to rotate rapidly to generate centrifugal force, the pushing unit is started to push the cable to the inner wall of the mounting cover to be fixed, and then the lifting plate stops descending.

Description

Double-girder grab bucket bridge crane Technical Field

[0001] This utility model relates to the field of crane technology, and in particular to a double-girder grab bucket bridge crane. Background Technology

[0002] Grab cranes, also known as grab hoists, are automated material handling machines. Their grabbing and unloading operations are controlled by the crane operator, eliminating the need for auxiliary personnel. This avoids heavy manual labor, saves auxiliary work time, and greatly improves loading and unloading efficiency. They are widely used in ports, docks, railway freight yards, mines, and other places for loading various bulk cargoes, logs, minerals, coal, sand and gravel, earthwork, etc.

[0003] A grab bucket crane with easy grab bucket docking, disclosed in patent application CN215974599U, includes: a connecting machine, one end of which is connected to a connecting seat and can control the lifting and lowering of the connecting seat; a connecting rod, rotatably connected to the connecting seat; a bucket body, disposed at one end of the connecting rod; rake teeth, disposed on the bucket body; a motor, disposed on one side of the connecting seat; a cable, connected to the motor and capable of pulling the bucket body for lifting; a connecting block, fixed to the surface of the bucket body; a locking spring, disposed inside the connecting rod; and a locking pin. This grab crane aligns the bucket body with one end of the connecting rod, inserts the connecting rod between the connecting blocks, presses the locking pin, causing the locking pin to squeeze the engaging spring and move into the interior of the connecting rod. After the locking pin passes through the interior of the connecting block, the limiting block is rotated, so that the movement of the locking pin is doubly restricted by the limiting block and the engaging spring, so that the bucket body can be installed on the connecting rod for easy docking. However, over time, the winch controlling the opening and closing rope of this grab crane may fail or the opening and closing cable may break unexpectedly, causing the cable to break and the grab bucket to open unexpectedly. This causes a large amount of material being hoisted to suddenly fall from mid-air, posing a great danger to property and personal safety, causing serious losses to the operating unit, and resulting in a safety accident. Summary of the Invention

[0004] The purpose of this utility model is to provide a double-beam grab bucket bridge crane. In the event of a failure of the winch of the opening and closing rope or an accidental breakage of the opening and closing cable, the sliding wheel generates centrifugal force through the cable, which causes the top block and the mounting cover to cooperate in clamping and fixing the cable, thus preventing the grab bucket from opening.

[0005] This utility model adopts the following technical solution: it includes a double beam guide rail, on which a trolley drive device is slidably mounted, and below the trolley drive device is a grab bucket unit. The grab bucket unit includes an upper support plate, with support arms hinged to both ends of the upper support plate, and grab buckets hinged to the lower ends of the support arms. A lifting plate is located below the upper support plate, with the opposite ends of the two grab buckets hinged to the lifting plate. A mounting cover is located above the lifting plate, and sliding wheels are installed inside the mounting cover. The sliding wheels have four equally spaced positioning grooves. A pulley block is located below the upper support plate, and a cable is wound between the pulley block and the sliding wheels.

[0006] The sliding wheel includes a rotating shaft installed inside the mounting cover and five rotating disks fixed on the rotating shaft. Each of the two adjacent rotating disks has an annular groove on its opposite side. The two adjacent annular grooves are combined to form a positioning groove. A pushing unit is provided between the two adjacent rotating disks.

[0007] Preferably, the pushing unit includes two top blocks, and each of the two adjacent rotating disks has an installation groove on one side. The two top blocks are slidably disposed on both sides of the installation groove. A rotating ring is disposed between the two top blocks. Two symmetrically arranged top rods are fixedly connected to the outer side of the rotating ring. The top rods are slidably disposed between the top blocks and the top blocks.

[0008] Preferably, the opposite side of the two top blocks is an arc surface, and the arc surface of the top block is flush with the annular groove.

[0009] Preferably, the sliding cavity has an upward-facing one-way opening, and the two top blocks have sliding grooves on opposite sides, which are symmetrically arranged relative to the center of the two sliding grooves. The end of the top rod away from the rotating ring is slidably disposed in the sliding groove.

[0010] Preferably, the slide groove includes a wide groove and a narrow groove arranged on the left and right sides. One end of the narrow groove is provided with an installation port. The end of the top rod away from the rotating ring is fixedly connected to a round rod adapted to the wide groove. The round rod is arranged perpendicular to the top rod.

[0011] Preferably, the rotating disk has two through holes symmetrically arranged around the rotating shaft, and bolts are installed inside the through holes. The five rotating disks are fixedly connected by two bolts.

[0012] Preferably, the rotating ring includes an outer ring and an inner ring, the inner ring is fixed on the rotating shaft, the push rod is fixed on the outside of the outer ring, and the outer ring and the inner ring are connected by a ratchet structure.

[0013] Preferably, the mounting cover has two symmetrically arranged rectangular slots on its upper part, and the cable passes through the rectangular slots from the pulley block and connects to the pulleys.

[0014] Preferably, the grab bucket has several equally spaced rake teeth on its lower part, and the rake teeth on the two grab buckets are staggered.

[0015] Preferably, the bottom of the inner cavity of the mounting cover is arc-shaped and coaxially arranged with the sliding wheel.

[0016] The beneficial effects of this utility model are:

[0017] 1. In the event of a malfunction in the winch controlling the opening and closing rope or an accidental breakage of the opening and closing rope, the lifting plate will descend rapidly under its own weight, causing the cable-driven pulley to rotate rapidly and generate centrifugal force. This will activate the jacking unit to push the cable against the inner wall of the mounting cover, thereby fixing the position of the cable and stopping the lifting plate from descending. This prevents the two grabs from opening and reduces the occurrence of safety accidents.

[0018] 2. The centrifugal force generated by the sliding wheel drives the top rod to rotate, causing the top rod to gradually change from an inclined state to a horizontal state. During the rotation, the top rod pushes the top block towards the annular groove, so that the cable is close to the inner wall of the mounting cover, thus achieving the clamping of the cable by the top block. Attached Figure Description

[0019] Figure 1 is a structural schematic diagram of the double-beam crane of this utility model;

[0020] Figure 2 is a schematic diagram of the structure of the grab bucket of this utility model;

[0021] Figure 3 is a structural schematic diagram of the first guide wheel and the second guide wheel of this utility model;

[0022] Figure 4 is a schematic diagram of the structure of the mounting cover of this utility model.

[0023] Figure 5 is a first-view structural schematic diagram of the sliding wheel of this utility model;

[0024] Figure 6 is a schematic diagram of the sliding wheel of this utility model from a second perspective.

[0025] Figure 7 is a schematic diagram of the structure of the rotating disk of this utility model;

[0026] Figure 8 is a schematic diagram of the structure of the top block of this utility model;

[0027] Figure 9 is a schematic diagram of the rotating ring of this utility model;

[0028] Figure 10 is a schematic diagram of the rotating ring of this utility model.

[0029] In the picture:

[0030] 1. Double beam guide rail; 11. Carriage drive equipment; 2. Grab bucket unit; 21. Upper support plate; 22. Grab bucket; 221. Rake teeth; 23. Support arm; 24. Lifting plate; 25. Mounting cover; 251. Rectangular groove; 26. First guide wheel; 27. Second guide wheel; 28. Sliding wheel; 281. Rotating disk; 282. Positioning groove; 283. Top block; 284. Ring groove; 285. Top rod; 286. Rotating ring; 287. Rotating shaft; 288. Mounting groove; 289. Through hole; 290. Bolt; 2831. Slide groove; 2861. Outer ring; 2862. Inner ring. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0032] As shown in Figures 1 to 10, this utility model provides a double-beam grab bucket bridge crane, including a double-beam guide rail 1. A trolley drive device 11 (the trolley drive device is prior art and will not be described in detail here) is slidably mounted on the double-beam guide rail 1. A grab bucket unit 2 is arranged below the trolley drive device 11. The grab bucket unit 2 includes an upper support plate 21. Support arms 23 are hinged to both ends of the upper support plate 21. A grab bucket 22 is hinged to the lower end of the support arms 23. When the two grab buckets 22 are closed, there is an overlap at the bottom between the two grab buckets 22 to reduce the outflow of material between the two grab buckets 22. A lifting plate 24 is arranged below the upper support plate 21. The opposite ends of the two grab buckets 22 are hinged to the lifting plate 24. A mounting cover 25 is arranged above the lifting plate 24. Two rectangular slots 251 are symmetrically arranged above the mounting cover 25. The internal part of the 5 is equipped with a sliding wheel 28. The bottom of the inner cavity of the mounting cover 25 is arc-shaped and coaxial with the sliding wheel 28. The sliding wheel 28 is provided with four equally spaced positioning grooves 282. A pulley group is provided below the upper support plate 21. A cable is wound between the pulley group and the sliding wheel 28. The grab bucket unit 2 adopts a four-rope grab bucket. The four-rope grab bucket has four steel wire ropes, namely two support cables and two opening and closing cables. The opening and closing cables are used between the pulley group and the sliding wheel 28. The working principle of the four-rope grab bucket is that there are two sets of double-row rope drums on the double beam. Each set of drums leads out two sets of cables. One set of two cables is tied to the rope rings or rope tie at both ends of the upper support plate 21 to support the steel wire rope. The other set of two cables is used as opening and closing cables. They pass through the pulley group and the sliding wheel 28 to form a pulley unit, which plays the role of opening and closing the two grab buckets 22.

[0033] The sliding wheel 28 includes a rotating shaft 287 installed inside the mounting cover 25 and five rotating disks 281 fixed on the rotating shaft 287. Annular grooves 284 are provided on opposite sides of two adjacent rotating disks 281. The two adjacent annular grooves 284 are combined to form a positioning groove 282. A pushing unit is provided between two adjacent rotating disks 281.

[0034] In the above scheme, at the beginning, the cable lifts the grab bucket 22 to a suitable position, and the opening and closing cable is lowered. At this time, the weight of the lifting plate 24 forces the two grab buckets 22 to open with the lifting plate 24 as the center, increasing the center distance between the upper support plate 21 and the lifting plate 24. Then the support cable falls, placing the opened grab bucket 22 on the loose pile of material to be grabbed. Then the opening and closing cable is pulled back, restoring the center distance between the upper support plate 21 and the lifting plate 24 to its original position, thus completing the process of grabbing materials. The space between the two closed grab buckets 22 is filled with material. Finally, the support cable and the opening and closing cable are lifted simultaneously, and the two grab buckets 22 are also lifted and moved to the required unloading site by the trolley drive equipment 11. The buckets are then opened to unload the grabbed material.

[0035] The jacking unit includes two jacking blocks 283. The opposite sides of the two jacking blocks 283 are arc-shaped surfaces, and the arc-shaped surfaces of the jacking blocks 283 are flush with the annular grooves 284 to ensure smoothness between the jacking blocks 283 and the annular grooves 284 and reduce wear on the cables. Each of the two adjacent rotating disks 281 has a mounting groove 288 on its opposite side, which is connected to the annular grooves 284. The two jacking blocks 283 are slidably disposed on both sides of the mounting grooves 288. A rotating ring 286 is disposed between the two jacking blocks 283. Two symmetrically arranged jacking rods 285 are fixedly connected to the outer side of the rotating ring 286, and the jacking rods 285 are slidably disposed between the jacking blocks 283 and the jacking blocks 283. A sliding groove 2831 is disposed on the opposite side of the two jacking blocks 283. The two sliding grooves 2831 are symmetrically arranged with respect to the center of the two sliding grooves 2831. The end of the jacking rod 285 away from the rotating ring 286 is slidably disposed in the sliding groove 2831.

[0036] In the above scheme, during normal use, the two top blocks 283 are in a retracted state, and the opposite ends of the two top blocks 283 are flush with the annular groove 284. The cable is located in the positioning groove 282 during use. Since the cable is taut, the top blocks 283 will not move easily. In addition, the two grabs 22 are in a stable opening or rising process, so that the rotating disk 281 rotates smoothly and the pushing unit is in a stationary state.

[0037] When the winch controlling the opening and closing cable fails or the opening and closing cable breaks unexpectedly, the lifting plate 24 will move rapidly downward due to gravity. At the same time, because the material in the two grab buckets 22 has the tendency to drive the two grab buckets 22 to open due to gravity, the lifting plate 24 descends rapidly, causing the two grab buckets 22 to open, causing a large amount of material being hoisted to suddenly fall from mid-air, resulting in economic losses and even casualties.

[0038] In this application, when the winch controlling the opening and closing cable fails or the opening and closing cable breaks unexpectedly, because the cable is wrapped around the sliding wheel 28, the cable will slide on the sliding wheel 28 when the lifting plate 24 moves downward, thereby causing the sliding wheel 28 to rotate rapidly and generate centrifugal force. The top block 283 moves towards the annular groove 284 through centrifugal force, so that the cable is close to the inner wall of the mounting cover 25. At the same time, the two top blocks 283 move synchronously through the rotating ring 286 and the two top rods 285, so that the top rods 285 gradually change from an inclined state to a horizontal state. (The top rod 285 is initially tilted); After the cable approaches the inner wall of the mounting cover 25, the top block 283 can clamp the cable, thereby fixing the cable and preventing the two grab buckets 22 from continuing to open, reducing the occurrence of safety accidents; In the event of such an accident, the two grab buckets 22 will open slightly, but under the action of the top block 283, the cable will be clamped, and the two grab buckets 22 will stop opening, avoiding the situation where the two grab buckets 22 open instantly in the event of an accident, preventing a large amount of material from falling suddenly, and giving the staff time to react and respond.

[0039] To facilitate the installation between the top block 283 and the top rod 285, in this embodiment, the sliding groove 2831 includes a wide groove and a narrow groove arranged on the left and right. One end of the narrow groove is provided with an installation port. The end of the top rod 285 away from the rotating ring 286 is fixedly connected to a round rod adapted to the wide groove. The round rod is arranged perpendicular to the top rod 285. The sliding groove 2831 is provided to facilitate the sliding between the top rod 285 and the top block 283, and at the same time, it is convenient for the top rod 285 to be installed on the top block 283. The round rod is provided to limit the top rod 285 on the top block 283 and prevent the top block 283 and the top rod 285 from separating.

[0040] The rotating disk 281 has two through holes 289 symmetrically arranged with the rotating shaft 287 as the center. Bolts 290 are installed inside the through holes 289. The five rotating disks 281 are fixedly connected by the two bolts 290. The bolts 290 are arranged to facilitate the installation of the five rotating disks 281, so that the five rotating disks 281 rotate synchronously.

[0041] To ensure that the position of the push rod 285 is locked after rotation, in this embodiment, the rotating ring 286 includes an outer ring 2861 and an inner ring 2862. The inner ring 2862 is fixed on the rotating shaft 287, and the push rod 285 is fixed on the outside of the outer ring 2861. The outer ring 2861 and the inner ring 2862 are connected by a ratchet structure. The ratchet is an existing and mature technical mechanism, which will not be described in detail here.

[0042] In the above scheme, after the sliding wheel 28 generates centrifugal force, the outer ring 2861 rotates, and the ratchet structure prevents the outer ring 2861 from reversing, thereby avoiding the top block 283 from retracting.

[0043] To further prevent the outer ring 2861 and inner ring 2862 from rotating and causing the top block 283 to protrude into the ring groove 284, a torsion spring is provided between the outer ring 2861 and inner ring 2862 in this embodiment.

[0044] The pulley block includes a first guide wheel 26 arranged along the length of the upper support plate 21 and a second guide wheel 27 arranged along the width of the upper support plate 21. The second guide wheel 27 is provided with two loops of cable.

[0045] In order to increase the material grabbing efficiency of the grab bucket 22, in this embodiment, a number of equally spaced rake teeth 221 are provided below the grab bucket 22, and the rake teeth 221 on the two grab buckets 22 are staggered.

[0046] The working principle of this utility model:

[0047] During long-term use, if the winch controlling the opening and closing rope fails or the opening and closing rope breaks unexpectedly, the cable will become entangled on the sliding wheel 28, causing the cable to lose its supporting force on the two grab buckets 22. The lifting plate 24 will descend rapidly, causing the cable to drive the sliding wheel 28 to rotate rapidly, thereby generating centrifugal force in the sliding wheel 28. The centrifugal force generated by the rotation of the sliding wheel 28 will cause the top rod 285 to change from an inclined state to a horizontal state.

[0048] The rotation of the top rod 285 will cause the two top blocks 283 to move in opposite directions, pushing the cable towards the inner wall of the mounting cover 25, pressing the cable against the inner wall of the mounting cover 25, increasing the friction between the two sides of the cable and the inner wall of the mounting cover 25 and the top blocks 283 respectively, thereby fixing the cable and clamping and locking the cable to prevent the two grab buckets 22 from continuing to move downward and causing the two grab buckets 22 to open, thus reducing the occurrence of safety accidents.

[0049] Meanwhile, the outer ring 2861 and inner ring 2862 in the rotating ring 286 are connected by a ratchet and pawl structure, which prevents the top block 283 from resetting.

[0050] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A double-girder grab bucket bridge crane, comprising a double-girder guide rail, a trolley drive device slidably mounted on the double-girder guide rail, and a grab bucket unit disposed below the trolley drive device, characterized in that: The grab unit includes an upper support plate, with support arms hinged to both ends of the upper support plate. A grab is hinged to the lower end of each support arm. A lifting plate is located below the upper support plate. The opposite ends of the two grabs are hinged to the lifting plate. A mounting cover is located above the lifting plate. A sliding wheel is installed inside the mounting cover. The sliding wheel has four equally spaced positioning grooves. A pulley assembly is located below the upper support plate. A cable is wound between the pulley assembly and the sliding wheel. The sliding wheel includes a rotating shaft installed inside the mounting cover and five rotating discs fixed on the rotating shaft. An annular groove is formed on the opposite side of each pair of adjacent rotating discs. The adjacent annular grooves combine to form a positioning groove. A pushing unit is located between each pair of adjacent rotating discs.

2. The double-girder grab bucket bridge crane according to claim 1, characterized in that: The jacking unit includes two jacking blocks. Each of the two adjacent rotating disks has an installation groove on one side. The two jacking blocks are slidably disposed on both sides of the installation groove. A rotating ring is disposed between the two jacking blocks. Two symmetrically arranged jacking rods are fixedly connected to the outer side of the rotating ring. The jacking rods are slidably disposed between the jacking blocks and the jacking blocks.

3. The double-girder grab bucket bridge crane according to claim 2, characterized in that: The opposite sides of the two top blocks are arc surfaces, and the arc surfaces of the top blocks are flush with the annular grooves.

4. The double-girder grab bucket bridge crane according to claim 2, characterized in that: The two top blocks have grooves on opposite sides, and are symmetrically arranged with respect to the center of the two grooves. The end of the top rod away from the rotating ring is slidably disposed in the groove.

5. The double-girder grab bucket bridge crane according to claim 4, characterized in that: The slide includes a wide groove and a narrow groove arranged on the left and right sides. One end of the narrow groove is provided with an installation port. The end of the top rod away from the rotating ring is fixedly connected to a round rod adapted to the wide groove. The round rod is arranged perpendicular to the top rod.

6. The double-girder grab bucket bridge crane according to claim 1, characterized in that: The rotating disk has two through holes symmetrically arranged around the rotating shaft. Bolts are installed inside the through holes, and the five rotating disks are fixedly connected by two bolts.

7. The double-girder grab bucket bridge crane according to claim 2, characterized in that: The rotating ring includes an outer ring and an inner ring. The inner ring is fixed on the rotating shaft, and the push rod is fixed on the outside of the outer ring. The outer ring and the inner ring are connected by a ratchet structure.

8. The double-girder grab bucket bridge crane according to claim 6, characterized in that: The mounting cover has two symmetrically arranged rectangular slots on its upper part, and the cable passes through the rectangular slots from the pulley block and connects to the pulley.

9. The double-girder grab bucket bridge crane according to claim 1, characterized in that: The grab bucket is provided with several equally spaced rake teeth below it, and the rake teeth on the two grab buckets are arranged alternately.

10. The double-girder grab bucket bridge crane according to claim 1, characterized in that: The bottom of the inner cavity of the mounting cover is arc-shaped and coaxial with the sliding wheel.

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