Large-tonnage height-limiting crane

Abstract

The utility model discloses a large-tonnage height-limiting crane which comprises two end beams, two main beams arranged between the two end beams, a movable track arranged on the main beams, a crane carriage running on the movable track, two groups of winding drum mechanisms arranged on the crane carriage, and a lifting appliance arranged below the winding drum mechanisms, each winding drum mechanism comprises a driving motor, a speed reducer and a winding drum, the driving motor is in transmission connection with the input end of the speed reducer through a coupler, the winding drum is installed at the output end of the speed reducer, and brakes are arranged on the two sides of the speed reducer; the lifting appliance comprises a mounting plate, a lifting hook is mounted at the bottom of the mounting plate, a movable pulley is mounted at the top of the mounting plate, a height limiting frame is arranged at the bottom of the hoisting trolley, and a limiting switch matched with the mounting plate is mounted on the inner side of the height limiting frame; according to the utility model, the height of a plurality of lifting appliances can be limited, and when the lifting appliances exceed the limited height, all winding drum mechanisms brake synchronously, so that the lifting of the steel wire rope is quickly limited, and the safety of lifting operation is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hoisting machinery technical field, especially a large tonnage height limiting crane. BACKGROUND

[0002] When the crane is hoisting, if the lifting appliance of the crane exceeds the limited height, the lifting appliance will collide with the boom, the main beam and other components of the crane, thereby causing the crane, and in serious cases, the steel wire rope will be separated from the pulley groove, the heavy object will fall and the like, especially for the large tonnage crane, the heavy object will cause great harm when it is unhooked. Therefore, in order to ensure the safety of hoisting, a height limiter needs to be installed on the lifting mechanism to limit the maximum height of the lifting hook. SUMMARY

[0003] The utility model discloses a large tonnage height limiting crane, which can limit the height of multiple lifting appliances, and when the lifting appliance exceeds the limited height, all the drum mechanisms are braked synchronously to quickly limit the upward movement of the steel wire rope, thereby improving the safety of hoisting.

[0004] To achieve the above object, the utility model adopts the following technical scheme: a large tonnage height limiting crane, comprising two end beams, two main beams are arranged between the two end beams, a moving track is arranged on the main beam, a hoisting trolley is arranged on the moving track, a drum mechanism is arranged on the hoisting trolley, a lifting appliance is connected to the drum mechanism through a steel wire rope below the drum mechanism, the drum mechanism is provided with two groups, each group of drum mechanisms comprises a driving motor, a speed reducer and a drum, the driving motor is in transmission connection with the input end of the speed reducer through a shaft coupling, the drum is installed on the output end of the speed reducer, and the speed reducer is provided with a brake on both sides; the lifting appliance comprises a mounting plate, a lifting hook is installed at the bottom of the mounting plate, a movable pulley is installed at the top of the mounting plate, a height limiting frame is arranged at the bottom of the hoisting trolley, and a limit switch matched with the mounting plate is installed on the inner side of the height limiting frame.

[0005] Optionally, the height limiting frame comprises two oppositely arranged guide plates, the spacing between the guide plates is matched with the width of the mounting plate, and the limit switch is installed on the inner side of the guide plate.

[0006] Optionally, the inner side of the guide plate is provided with a mounting groove, the limit switch is arranged in the mounting groove and is uniformly hinged in the mounting groove, and a return spring is arranged between the mounting groove and the limit switch.

[0007] Optionally, the top of the mounting plate is provided with a guide inclined surface.

[0008] Optionally, a plurality of rollers are uniformly arranged on the two sides of the mounting plate.

[0009] Optionally, a bumper is arranged on the top of the height limiting frame.

[0010] The large tonnage height limiting crane has the following advantages:

[0011] (1) The height limiter is arranged above each lifting appliance, when one lifting appliance exceeds the height of the height limiter, all the winding drums are braked to stop the ascending of the steel wire rope in time, and the safety of the lifting operation is improved.

[0012] (2) The roller can make the installation plate ascend and descend more smoothly in the height limiter, avoid the installation plate from being stuck, and affect the triggering accuracy of the limit switch.

[0013] (3) The buffer can buffer the continuous ascending of the lifting appliance, and avoid the lifting appliance from causing more serious damage to the lifting equipment. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is the front view of the utility model.

[0015] Figure 2 is the top view of the utility model.

[0016] Figure 3 is the cooperation schematic view of the height limiter and the lifting appliance.

[0017] Figure 4 is the structural schematic view of the guide plate. DETAILED DESCRIPTION

[0018] The utility model will be further explained in connection with the drawings.

[0019] As shown in Figures 1-4 , a large-tonnage height-limited crane, comprising two end beams 1, two main beams 2 are arranged between the two end beams 1, a moving track 3 is arranged on the main beam 2, a lifting trolley 4 is operated on the moving track 3, a winding drum 9 mechanism 5 is arranged on the lifting trolley 4, and a lifting appliance 6 is connected below the winding drum 9 mechanism 5 through a steel wire rope. The winding drum 9 mechanism 5 is provided with two groups, and each group of winding drum 9 mechanism 5 comprises a driving motor 7, a speed reducer 8 and a winding drum 9, the driving motor 7 is in transmission connection with the input end of the speed reducer 8 through a shaft coupling, the winding drum 9 is installed on the output end of the speed reducer 8, and the speed reducer 8 is provided with a brake 10 on both sides.

[0020] The lifting appliance 6 comprises a horizontally arranged installation plate 11, a lifting hook 12 is installed at the bottom of the installation plate 11, a movable pulley 13 is installed at the top of the installation plate 11, and the steel wire rope passes through the movable pulley 13. The bottom of the lifting trolley 4 is provided with a height limiter 14 matched with the lifting appliance 6, the height limiter 14 comprises two vertically arranged guide plates 15, the two guide plates 15 are oppositely arranged, and the spacing between the guide plates 15 is matched with the width of the installation plate 11. The inner side of the guide plate 15 is provided with a mounting groove 16, a plurality of limit switches 17 are uniformly hinged in the mounting groove 16, the limit switches 17 are electrically connected with a controller, and a reset spring 18 is arranged between the mounting groove 16 and the limit switch 17.

[0021] The top of the installation plate 11 on both sides is provided with a guide slope 19, which cooperates with the limit switch 17 to make the triggering of the limit switch 17 more smooth. The two sides of the installation plate 11 are uniformly provided with a plurality of rollers 20, which can be in contact with the inner wall of the guide plate 15, improving the smoothness of the installation plate 11 in the height limiting frame 14, avoiding the occurrence of the installation plate 11 jamming, and affecting the triggering of the limit switch 17. The top of the height limiting frame 14 is provided with a buffer 21 corresponding to the installation plate 11, which can buffer the continued rising of the lifting device 6, avoid the lifting device 6 from colliding with the hoisting equipment violently, causing serious accidents, and improve the safety of the hoisting equipment operation.

[0022] When the crane is performing hoisting operation, the two lifting devices 6 cooperate to carry and overturn large-tonnage heavy objects, etc. When the lifting height of the lifting device 6 exceeds the limited height, the lifting device 6 enters the height limiting frame 14, the installation plate 11 moves upward in the guide plate 15, the guide slope 19 triggers the limit switch 17, and the controller controls the brake 10 to brake the winding drum 9. At this time, the lifting device 6 will not stop rising immediately, the installation plate 11 will press the limit switch 17 to both sides, and continue to rise until it contacts the buffer 21. The buffer 21 can absorb the collision impact of the installation plate 11, protect the hoisting equipment, and cooperate with the brake 10 to stop the lifting device 6 from rising in time, improve the safety of the hoisting operation.

[0023] The above-described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present application.

Claims

1. A high-tonnage height-limiting crane, comprising two end beams, two main beams disposed between the two end beams, a moving rail disposed on the main beams, a lifting trolley running on the moving rails, a drum mechanism disposed on the lifting trolley, and a lifting device connected to the lower part of the drum mechanism by a wire rope, characterized in that: The drum mechanism is provided in two sets. Each set of drum mechanism includes a drive motor, a reducer and a drum. The drive motor is connected to the input end of the reducer through a coupling. The drum is installed at the output end of the reducer. Brakes are provided on both sides of the reducer. The lifting device includes a mounting plate. A hook is installed at the bottom of the mounting plate and a movable pulley is installed at the top of the mounting plate. A height limit frame is provided at the bottom of the lifting trolley. A limit switch matching the mounting plate is installed on the inner side of the height limit frame.

2. The high-tonnage height-limiting crane as described in claim 1, characterized in that: The height restriction frame includes two guide plates arranged opposite each other. The distance between the guide plates matches the width of the mounting plate, and the limit switch is installed on the inside of the guide plates.

3. The large-tonnage height-limiting crane as described in claim 2, characterized in that: The guide plate has an inner groove for mounting. Several limit switches are evenly hinged in the mounting groove, and a reset spring is provided between the mounting groove and the limit switch.

4. The large-tonnage height-limiting crane as described in claim 1, characterized in that: Guide ramps are provided on the top of both sides of the mounting plate.

5. The high-tonnage height-limiting crane as described in claim 1, characterized in that: Several rollers are evenly distributed on both sides of the mounting plate.

6. The high-tonnage height-limiting crane as described in claim 1, characterized in that: The top of the height restriction barrier is equipped with a buffer.

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