Safe and reliable trolley

Abstract

A safe and reliable trolley relates to the technical field of cranes and comprises a trolley frame, a duplex winding drum, a lifting hook and a balance mechanism, a balance mechanism for fixing a steel wire rope is arranged on the other side of the top of the trolley frame; arc-shaped dragging pads and first limiting switches for detecting broken shafts are arranged at the bottoms of the two ends, corresponding to the duplex winding drum, of the trolley frame; safety reverse hooks capable of being clamped with corresponding track beams are arranged on the two sides of the bottom of the trolley frame; a lifting hook is arranged below the trolley frame; the top of the lifting hook is rotationally connected with a movable pulley block; the two steel wire ropes are wound around the two ends of the duplex winding drum respectively and correspondingly connected with the balance mechanism after being wound around the movable pulley block. When a shaft is broken, the corresponding end of the duplex winding drum falls on the arc-shaped dragging pad and is locked by the arc-shaped dragging pad, and meanwhile, the first limiting switch is triggered to send a shutdown signal, so that the situation that the driving device continuously drives the duplex winding drum to rotate, and the duplex winding drum rolls off from the trolley frame is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of cranes, in particular to a safe and reliable trolley. Background Art

[0002] Cranes are important tools and equipment in modern industrial production and manufacturing processes, and are widely used in steel, shipbuilding, aerospace, road transportation, port terminals and other places.

[0003] In some working conditions with very high safety requirements, traditional cranes have poor safety and reliability performance and cannot meet the higher safety level requirements. When commonly used cranes are lifting equipment, if the wire rope breaks, the drum shaft breaks, and other extreme situations occur, the safety of the lifting equipment cannot be guaranteed, causing the equipment to fall, which will not only cause equipment damage, but may also cause safety accidents. In this case, higher safety requirements are placed on lifting equipment.

[0004] A Chinese patent (publication number: CN107934818A) discloses a lifting mechanism for a circular crane with an axle break protection function; the patent includes axle break protection groups located under the end plates at both ends of the drum group, the axle break protection group includes two mirror-arranged axle break protection devices that support the end plates, the axle break protection device includes a support on the trolley frame through a first bolt group, a shaft fixed to the support through a shaft end baffle and a second bolt group, and a support wheel installed on the shaft through a shaft sleeve; the patent structure only has support wheels on both sides of the drum, but when the axle breaks, the drum may tilt and cannot fall exactly on the two support wheels, and the drum still has a large risk of falling. Utility Model Content

[0005] In order to overcome the deficiencies in the background technology, the utility model discloses a safe and reliable trolley.

[0006] In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

[0007] A safe and reliable trolley comprises a trolley frame, a double drum, a hook and a balancing mechanism; a double drum is installed on one side of the top of the trolley frame, and a balancing mechanism for fixing a steel wire rope is provided on the other side; arc-shaped drag pads and a first limit switch for detecting broken axles are provided at the bottom positions of both ends of the trolley frame corresponding to the double drum; an arc-shaped groove is provided on the top of the arc-shaped drag pad, and a plurality of rollers are provided at intervals in the arc-shaped groove; safety counter-hooks that can engage with corresponding track beams are provided on both sides of the bottom of the trolley frame; a hook is provided under the trolley frame, and the top of the hook is rotatably connected to a movable pulley block; a steel wire rope is wound around each end of the double drum, and the two steel ropes are connected to the balancing mechanism after being wound around the movable pulley block.

[0008] Preferably, the balancing mechanism includes a support that is tightly connected to the corresponding trolley frame, and a balancing arm is hinged on the top of the support; both ends of the corresponding balancing arm of the trolley frame are provided with limit columns for limiting the deflection angle of the balancing arm, and the column body of the limit column is installed with a second limit switch that can be triggered by the balancing arm; the two steel ropes are respectively tightly connected to the corresponding two ends of the balancing arm through the tension adjustment device.

[0009] Preferably, the balancing mechanism further includes a bracket, with a balancing wheel group suspended on the top of the bracket through a hinged shaft; two fixed pulley groups are rotatably connected between the corresponding supports of the trolley frame and the bracket; two movable pulley groups are rotatably connected to the top of the hook; the wire rope is wound several times between one of the movable pulley groups and a fixed pulley group, then redirected through the balancing wheel group, and after redirecting, it is wound several times between the other movable pulley group and the other fixed pulley group.

[0010] Preferably, the tension adjustment device includes a connecting rod and a connecting sleeve, one end of the connecting rod is hinged to the corresponding balance arm, and the other end is threadedly connected to the connecting sleeve. The end of the connecting sleeve facing away from the balance arm is rotatably connected to a connecting cap, and the connecting cap is tightly connected to the corresponding end of the wire rope.

[0011] Preferably, a top screw is installed on the end of the connecting sleeve away from the connecting cap.

[0012] Preferably, a hanging plate is provided between the tension adjusting device and the balancing arm, one end of the hanging plate is hinged to the balancing arm, and the other end is connected to the tension adjusting device.

[0013] Preferably, the tension adjustment device is hinged to the hanging plate via a pin-type sensor.

[0014] Preferably, horizontal guide wheels capable of rolling contact with corresponding rails are installed on both sides of the bottom of one end of the trolley frame.

[0015] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0016] The utility model discloses a safe and reliable trolley with a simple structure, easy assembly and low production cost. The bottom positions of both ends of the trolley frame corresponding to the double reels are provided with arc-shaped drag pads and a first limit switch for detecting broken shafts. When the double reels have broken shafts, the corresponding ends of the double reels immediately fall on the arc-shaped drag pads. The tops of the arc-shaped drag pads are provided with arc-shaped grooves, and a plurality of rollers are arranged at intervals in the arc-shaped grooves. When the double reels fall on the arc-shaped drag pads, they can be supported by the rollers, which is safe and reliable. At the same time, the first limit switch is triggered to send a stop signal to prevent the driving device from continuing to drive the double reels to rotate, causing the double reels to roll off the trolley frame.

[0017] The utility model is provided with limit columns for limiting the deflection angle of the balancing arm at both ends of the trolley frame corresponding to the balancing arm, and the limit column body is installed with a second limit switch which can be triggered by the balancing arm; during normal lifting, the balancing arm is in a balanced state; if one of the steel wire ropes breaks accidentally, the other steel wire rope will bear the lifting weight alone, and at the same time the balancing arm will deflect due to the imbalance of force, and the balancing arm will continue to tighten the steel wire rope bearing the lifting weight after colliding with the corresponding limit column to prevent the hook and the lifted object from falling; at the same time, the balancing arm triggers the second limit switch, the second limit switch sends a stop signal, and the double drum stops moving to prevent the dangerous situation from occurring again, thereby effectively improving the safety performance.

[0018] The balancing mechanism of the present invention also includes a bracket, and a balancing wheel set is suspended on the top of the bracket through a hinge shaft. The rotation axis of the balancing wheel set is perpendicular to the hinge shaft, so that the balancing wheel set can automatically adapt to the direction of the wire rope, avoiding the phenomenon of the wire rope escaping from the wheel groove of the balancing wheel set.

[0019] The rope winding method of the utility model effectively increases the spacing between the steel ropes, improves the balance of the hook when it is raised and lowered, reduces the swing amplitude of the hook, and increases the safety of the lifting mechanism.

[0020] The utility model further provides a tension adjustment device between the wire rope and the hanging plate, one end of the tension adjustment device is tightly connected to the wire rope, and the other end is hinged to the hanging plate through a pin-type sensor; the pin-type sensor monitors the tension of the corresponding wire rope in real time. When the pin-type sensor on one side detects that the tension is 0, it is considered that the wire rope has broken and an alarm is started, thereby realizing the broken rope alarm function and further improving the safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the utility model;

[0022] Figure 2 This is a schematic diagram of the connection structure between the curved drag pad and the trolley frame;

[0023] Figure 3 It is a structural diagram of a curved mop pad;

[0024] Figure 4 It is a structural diagram of the balancing mechanism;

[0025] Figure 5 It is a side view of the balancing mechanism;

[0026] Figure 6 The following is a simplified diagram of the winding method of two steel wire ropes;

[0027] Figure 7 It is a structural diagram of the tension adjustment device;

[0028] Figure 8It is a structural diagram of the small vehicle frame.

[0029] In the figure: 1. Trolley frame; 2. Double reel; 3. Hook; 4. Balancing mechanism; 4-1. Support; 4-2. Balancing arm; 4-3. Limit column; 4-4. Second limit switch; 4-5. Balancing wheel assembly; 4-6. Fixed pulley assembly; 4-7. Hanging plate; 4-8. Pin-type sensor; 4-9. Bracket; 5. Movable pulley assembly; 6. Tension adjusting device; 6-1. Connecting rod; 6-2. Connecting sleeve; 6-3. Connecting cap; 6-4. Top screw; 7. Safety anti-hook; 8. Horizontal guide wheel; 9. Arc-shaped drag pad; 10. First limit switch. DETAILED DESCRIPTION

[0030] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", and "right" indicating directions or positional relationships, they are only corresponding to the drawings of the present application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction.

[0031] Example 1, combined with the attached Figures 1 to 4 A safe and reliable trolley comprises a trolley frame 1, a double drum 2, a hook 3 and a balancing mechanism 4; a double drum 2 is installed on one side of the top of the trolley frame 1, and a balancing mechanism 4 for fixing the wire rope is provided on the other side; arc-shaped drag pads 9 and a first limit switch 10 for detecting broken shafts are provided at the bottom positions of both ends of the trolley frame 1 corresponding to the double drum 2. When the double drum 2 breaks, the corresponding end of the double drum 2 immediately falls on the arc-shaped drag pad 9. An arc groove is provided on the top of the arc-shaped drag pad 9, and a plurality of rollers are provided in the arc groove at intervals. When the double drum 2 breaks, the corresponding end of the double drum 2 falls on the arc-shaped drag pad 9. When the trolley falls on the arc-shaped drag pad 9, it can be supported by the rollers, which is safe and reliable. At the same time, the first limit switch 10 is triggered to send a stop signal to prevent the driving device from continuing to drive the double reel 2 to rotate, causing the double reel 2 to roll off the trolley frame 1; both sides of the bottom of the trolley frame 1 are provided with safety anti-hooks 7 that can engage with the corresponding track beams. When the axle is broken or other unexpected situations occur, the trolley frame 1 will tilt. When the trolley frame 1 tilts, the safety anti-hooks 7 immediately engage with the corresponding track beams, thereby limiting the excessive tilt of the trolley frame 1, effectively improving the safety performance;

[0032] It should be noted that, under normal circumstances, a gap is left between the arc-shaped drag pad 9 and the corresponding ends of the double reel 2 to avoid interference with the normal rotation of the double reel 2.

[0033] A double drum 2 is installed on one side of the top of the trolley frame 1, and a balancing mechanism 4 is provided on the other side; the balancing mechanism 4 includes a support 4-1 that is fastened to the corresponding trolley frame 1, and a balancing arm 4-2 is hinged on the top of the support 4-1; Figure 4 As shown, the middle part of the balancing arm 4-2 is hinged to the top of the support 4-1; both ends of the trolley frame 1 corresponding to the balancing arm 4-2 are provided with limit columns 4-3 for limiting the deflection angle of the balancing arm 4-2, and the column body of the limit column 4-3 is installed with a second limit switch 4-4 that can be triggered by the balancing arm 4-2, that is, when the balancing arm 4-2 is unbalanced, it will deflect to one side until it collides with the corresponding limit column 4-3, and the second limit switch 4-4 will be triggered at the same time.

[0034] A hook 3 is provided under the trolley frame 1, and the top of the hook 3 is rotatably connected to a movable pulley set 5; a steel wire rope is wound around each end of the double drum 2, and after the two steel wire ropes are wound around the movable pulley set 5, they are respectively fastened to the corresponding two ends of the balance arm 4-2 through the tension adjustment device 6, that is, the two steel wire ropes are independent of each other and bear equal weight. The distance between the corresponding end of the steel wire rope and the balance arm 4-2 is adjusted by the tension adjustment device 6, so that the operation of leveling the balance arm 4-2 can be facilitated.

[0035] During normal lifting, the balancing arm 4-2 is in a balanced state; if one of the steel wire ropes breaks accidentally, the other steel wire rope will bear the lifting weight alone, and the balancing arm 4-2 will deflect due to the imbalance of force. After the balancing arm 4-2 collides with the corresponding limit column 4-3, it will continue to tighten the steel wire rope that bears the lifting weight to prevent the hook 3 and the lifted object from falling; at the same time, the balancing arm 4-2 triggers the second limit switch 4-4, and the second limit switch 4-4 sends a stop signal, and the double drum 2 stops moving to prevent dangerous situations from occurring again, thereby effectively improving safety performance.

[0036] It should be noted that in addition to the imbalance of the balance arm 4-2 caused by the breakage of the wire rope, the tangled rope phenomenon when the double drum 2 reels the wire rope will cause the two wire ropes to be unevenly stressed, which will also cause the imbalance of the balance arm 4-2 and trigger the second limit switch 4-4 to remind the operator to deal with it in time, further improving the safety performance.

[0037] Example 2: To further enhance the stability during lifting, this example is further improved.

[0038] Combined with attachment Figures 4-6 A safe and reliable trolley is different from Example 1 in that, based on Example 1, the balancing mechanism 4 further includes a bracket 4-9, and a balancing wheel set 4-5 is suspended on the top of the bracket 4-9 through a hinge shaft, as shown in the attached Figure 3 As shown, the rotation axis of the balancing wheel set 4-5 is perpendicular to the corresponding hinge axis, so that the balancing wheel set 4-5 can automatically adapt to the direction of the wire rope, avoiding the phenomenon that the wire rope escapes from the wheel groove of the balancing wheel set 4-5.

[0039] The trolley frame 1 is rotatably connected to two fixed pulley sets 4-6 between the corresponding support 4-1 and the bracket 4-9; the top of the hook 3 is rotatably connected to two movable pulley sets 5; the wire rope is wound several times between one movable pulley set 5 and a fixed pulley set 4-6, then redirected by the balance wheel set 4-5, and then wound several times between the other movable pulley set 5 and the other fixed pulley set 4-6;

[0040] As attached Figure 6 As shown, the steel wire rope wound around the left end of the double drum 2 is first wound several times between the movable pulley group 5 on the left and the fixed pulley group 4-6 on the left, and then changed direction through the balance wheel group 4-5. After changing direction, it is wound several times between the movable pulley group 5 on the right and the fixed pulley group 4-6 on the right, and then is fastened to the right end of the balance arm 4-2. The winding method of the steel wire rope wound around the right end of the double drum 2 is exactly opposite to the winding method of the steel wire rope wound around the left end.

[0041] It should be noted that if Figure 6 As shown, the steel wire rope wound around the left end of the double drum 2 is located on the inner side of the two movable pulley sets 5, and the steel wire rope wound around the right end of the double drum 2 is located on the outer side of the two movable pulley sets 5, which effectively widens the distance between the steel wire ropes, increases the balance of the hook 3 during lifting and lowering, reduces the swing amplitude of the hook, and increases the safety of the lifting mechanism.

[0042] Example 3: To further enhance safety performance, this example is further improved.

[0043] Combined with attachment Figure 4 and 7 , a safe and reliable trolley, based on embodiment 1 or 2, the tension adjustment device 6 includes a connecting rod 6-1 and a connecting sleeve 6-2, one end of the connecting rod 6-1 is hinged to the corresponding balance arm 4-2, and the other end is threadedly connected to the connecting sleeve 6-2, and the end of the connecting sleeve 6-2 away from the balance arm 4-2 is rotatably connected to the connecting cap 6-3, and the connecting cap 6-3 is tightly connected to the corresponding end of the wire rope, that is, the distance between the corresponding end of the wire rope and the balance arm 4-2 can be adjusted by screwing the connecting sleeve 6-2, so as to facilitate the operation of leveling the balance arm 4-2; the end of the connecting sleeve 6-2 away from the connecting cap 6-3 is installed with a top screw 6-4, and the top screw 6-4 can be tightened after the balance arm 4-2 is leveled to prevent the connecting sleeve 6-2 and the connecting rod 6-1 from accidentally rotating relative to each other, causing the balance arm 4-2 to become unbalanced.

[0044] A hanging plate 4-7 is provided between the tension adjustment device 6 and the balance arm 4-2. One end of the hanging plate 4-7 is hinged to the balance arm 4-2, and the other end is connected to the tension adjustment device 6. The tension adjustment device 6 is hinged to the hanging plate 4-7 through a pin-type sensor 4-8; the pin-type sensor 4-8 monitors the tension of the corresponding wire rope in real time. When the pin-type sensor on one side detects that the tension is 0, it is considered that the wire rope has broken, and an alarm is started, thereby realizing the broken rope alarm function; further improving the safety performance.

[0045] Example 4: In order to further improve the safety performance, this example is further improved; a safe and reliable trolley, based on any one of Examples 1-3, the trolley frame 1 is provided with horizontal guide wheels 8 on both sides of the bottom at one end that can roll in contact with the corresponding rails, as shown in the attached figure. Figure 8 As shown, the horizontal guide wheel 8 can play a guiding role to prevent the wheels of the trolley frame 1 from accidentally leaving the track.

[0046] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended that all changes that fall within the meaning and scope of equivalent elements are included in the present invention.

Claims

1. A safe and reliable car, characterized by: The invention comprises a trolley frame (1), a double drum (2), a hook (3) and a balancing mechanism (4); a double drum (2) is installed on one side of the top of the trolley frame (1), and a balancing mechanism (4) for fixing a steel wire rope is provided on the other side; arc-shaped drag pads (9) and a first limit switch (10) for detecting a broken shaft are provided at the bottom positions of both ends of the trolley frame (1) corresponding to the double drum (2); an arc-shaped groove is provided on the top of the arc-shaped drag pad (9), and a plurality of rollers are provided at intervals in the arc-shaped groove; safety anti-hooks (7) that can be engaged with corresponding track beams are provided on both sides of the bottom of the trolley frame (1); a hook (3) is provided below the trolley frame (1), and the top of the hook (3) is rotatably connected to a movable pulley block (5); a steel wire rope is wound around each end of the double drum (2), and the two steel wire ropes are wound around the movable pulley block (5) and are connected to the balancing mechanism (4) accordingly.

2. The safe and reliable vehicle according to claim 1, characterized in that: The balancing mechanism (4) comprises a support (4-1) which is correspondingly and firmly connected to the trolley frame (1), and a balancing arm (4-2) is hinged on the top of the support (4-1); both ends of the trolley frame (1) corresponding to the balancing arm (4-2) are provided with a limit column (4-3) for limiting the deflection angle of the balancing arm (4-2), and the body of the limit column (4-3) is installed with a second limit switch (4-4) which can be triggered by the balancing arm (4-2); two steel wire ropes are respectively and firmly connected to the two ends of the balancing arm (4-2) (6) through a tension adjustment device.

3. The safe and reliable vehicle according to claim 1, characterized in that: The balancing mechanism (4) further comprises a bracket (4-9), a balancing wheel group (4-5) being suspended on the top of the bracket (4-9) via a hinged shaft; two fixed pulley groups (4-6) are rotatably connected between the corresponding support (4-1) of the trolley frame (1) and the bracket (4-9); the top of the hook (3) is rotatably connected to two movable pulley groups (5); the wire rope is wound several times between one movable pulley group (5) and a fixed pulley group (4-6), and then redirected by the balancing wheel group (4-5), and then wound several times between another movable pulley group (5) and another fixed pulley group (4-6).

4. The safe and reliable vehicle according to claim 2, characterized in that: The tension adjustment device (6) comprises a connecting rod (6-1) and a connecting sleeve (6-2); one end of the connecting rod (6-1) is hinged to the balancing arm (4-2), and the other end is threadedly connected to the connecting sleeve (6-2); one end of the connecting sleeve (6-2) facing away from the balancing arm (4-2) is rotatably connected to a connecting cap (6-3); and the connecting cap (6-3) is tightly connected to the corresponding end of the wire rope.

5. The safe and reliable vehicle according to claim 4, characterized in that: A top screw (6-4) is installed on one end of the connecting sleeve (6-2) facing away from the connecting cap (6-3).

6. The safe and reliable vehicle according to claim 2, characterized in that: A hanging plate (4-7) is provided between the tension adjustment device (6) and the balance arm (4-2); one end of the hanging plate (4-7) is hinged to the balance arm (4-2), and the other end is connected to the tension adjustment device (6).

7. The safe and reliable vehicle according to claim 6, characterized in that: The tension adjustment device (6) is correspondingly hinged to the hanging plate (4-7) via a pin-type sensor (4-8).

8. The safe and reliable vehicle according to claim 1, characterized in that: Horizontal guide wheels (8) capable of rolling contact with corresponding rails are installed on both sides of the bottom of one end of the trolley frame (1).

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