Modularized four-rope grab bucket automatic transfer mechanism

Abstract

The utility model discloses a modularized four-rope grab bucket automatic transfer mechanism which comprises a lifting unit, an opening and closing unit, a four-rope mechanical grab bucket, a trolley operation driving mechanism, a horizontal guide wheel, a rigid guide column structure, an overload protection mechanism, a steel wire rope skipping prevention mechanism and a guide rod. Driving units of the lifting unit and the opening and closing unit are connected with winding drums of the lifting unit and the opening and closing unit through splines, each winding drum is wound with two steel wire ropes, and each steel wire rope is connected with a four-rope mechanical grab bucket; the trolley running driving mechanism drives the wheel sets to run synchronously through couplings and transmission shafts. A wheel shaft of the horizontal guide wheel adopts an eccentric shaft structure to ensure a gap between a bearing wheel of the horizontal guide wheel and a rail; a guide pillar structure ensures that the four-rope mechanical grab bucket below does not shake when the trolley runs; the bearing capacity at the two ends of the winding drum acts on the overload protection structure to ensure that the bearing capacity does not change along with movement of the steel wire rope in the lifting process; the steel wire rope skipping prevention mechanism translates on the winding drum under the guide of the guide rod to prevent the steel wire rope from skipping.

Description

Technical Field

[0001] The utility model belongs to the field of cranes, and is applicable to a four-rope grab crane that applies an automatic control system and adopts a modular hoisting drive unit, and particularly relates to a modular four-rope grab automatic transfer mechanism. Background Art

[0002] With the development of society, the working conditions of intelligent cranes are becoming more and more complex, the on-site process requirements are higher, and higher requirements are put forward for the positioning accuracy of intelligent cranes and the swing amplitude during operation. The traditional four-rope grab transfer trolley has a bulky structure and a heavy self-weight. When the grab descends to the lower limit position, it is necessary to continue to pay out the rope and rely on gravity to grab materials. At this time, the steel wire rope is very easy to get tangled, resulting in the phenomenon of the steel wire rope jumping out of the groove, which affects the service life of the steel wire rope and the drum. In addition, the positioning accuracy of the traditional transfer mechanism is poor, and it cannot be used in cooperation with the automatic control under the working conditions with relatively high accuracy requirements. Summary of the Invention

[0003] In view of the above problems existing in the prior art, the utility model provides a modular four-rope grab automatic transfer mechanism.

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

[0005] A modular four-rope grab automatic transfer mechanism includes a hoisting unit, a closing and opening unit, and a four-rope mechanical grab arranged on a trolley frame. The hoisting unit and the closing and opening unit each include a drive unit and a drum. The drive units of the hoisting unit and the closing and opening unit are connected to their respective drums by splines. Two steel wire ropes are wound around each drum, and each steel wire rope is connected to the four-rope mechanical grab;

[0006] It further includes a trolley running drive mechanism, which includes a K series reduction motor fixed on the trolley frame. The K series reduction motor drives the wheel set to run synchronously through a coupling and a transmission shaft;

[0007] A horizontal guide wheel is arranged at the end of the trolley frame through a horizontal guide wheel bracket. The horizontal guide wheel bracket is connected to the trolley frame by locating through a reamed hole, and the axle of the horizontal guide wheel adopts an eccentric shaft structure;

[0008] A rigid guide post structure includes a connecting base, an intermediate guide cylinder and a guide post. The connecting base is welded on the trolley frame. The intermediate guide cylinder is fixed to the connecting base by bolts. The guide post is fixed to the four-rope mechanical grab by bolts. The guide post is inserted into the intermediate guide cylinder to achieve guiding and positioning; a guide pulley group is also arranged on the side of the intermediate guide cylinder;

[0009] The overload protection mechanism includes an overload protector, an overload base, and a drum clamping plate base. The overload protector is a pressure sensor. The overload base is fixed on the trolley frame, and the overload protector is bolted to the overload base. The drum clamping plate base is sleeved at both ends of the drum. The drum is rotatably connected to the drum clamping plate base through a bearing. The overload protector is bolted to the drum clamping plate base. A mating card slot and protrusion are provided at the connection part between the drum clamping plate base and the overload protector;

[0010] The wire rope anti-skip mechanism and the guide rod. The two drum clamping plate bases are connected by the guide rod in the middle. The wire rope anti-skip mechanism is sleeved on the drum. The wire rope anti-skip mechanism is in spiral cooperation with the drum and is slidably connected to the guide rod. The wire rope anti-skip mechanism can translate on the drum under the guiding action of the guide rod.

[0011] A buffer is also provided at the end of the trolley frame outside the horizontal guide wheel bracket.

[0012] Compared with the prior art, the four-rope grab transfer mechanism disclosed by the present utility model can greatly improve the positioning accuracy of the transfer mechanism, has a high degree of modularization, better adapts to the automated working mode, can effectively prevent the phenomenon of wire rope entanglement and jumping out of the groove, and can efficiently grab materials. Brief Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of the present utility model.

[0014] Figure 2 is a schematic structural diagram of the present utility model from another angle.

[0015] Figure 3 is a schematic structural diagram of the overload protection mechanism.

[0016] In the figure: 1 - hoisting unit, 2 - opening and closing unit, 3 - horizontal guide wheel, 4 - guide column structure, 41 - connecting base, 42 - intermediate guide cylinder, 43 - guide column, 44 - guide pulley group, 5 - four-rope mechanical grab, 51 - guide wheel, 52 - intermediate cross beam, 53 - pulley group, 6 - trolley running drive mechanism, 61 - reduction motor, 62 - transmission shaft, 63 - wheel set, 7 - wire rope anti-skip mechanism, 8 - guide rod, 9 - drum clamping plate base, 10 - drive unit, 11 - running protection limit, 12 - drum, 13 - overload protector, 14 - overload base, 15 - trolley frame, 16 - buffer, 17 - card slot, 18 - protrusion, 19 - wire rope. Detailed Description of the Preferred Embodiments

[0017] As Figure 1 、 Figure 2As shown in the figure, a modular four-rope grab automatic transfer mechanism includes a hoisting unit 1 and a closing and opening unit 2 arranged on a trolley frame. The hoisting unit 1 and the closing and opening unit 2 are jointly connected to a four-rope mechanical grab 5. Both the hoisting unit 1 and the closing and opening unit 2 include a driving unit 10 and a drum 12. A spline connection is adopted between the driving unit 10 and the drum 12 of the hoisting unit 1 and the closing and opening unit 2. Two steel ropes 19 are respectively wound on each drum 12, and each steel rope is connected to the four-rope mechanical grab 5. The hoisting unit 1 and the closing and opening unit 2 drive their respective drums 12 to rotate through their respective driving units 10 to ensure smoothness during the hoisting process. The hoisting unit 1 is connected to the balance arm lifting points of the four-rope mechanical grab 5 through two steel ropes, such as both ends of the balance arm. By winding the drum, the hoisting height of the grab is controlled. By increasing the length of the balance arm, the distance of the lifting points is enlarged, which can effectively reduce the torsion of the four-rope grab during use. The closing and opening unit 2 is connected to the guide wheel 51 above the four-rope mechanical grab 5, the middle cross beam 52, and the pulley block 53 at the top through steel ropes. When the drum winds up, the position of the middle cross beam 52 is adjusted through the steel rope, and the middle cross beam 52 approaches the guide wheel 51 above the four-rope mechanical grab 5 to achieve the opening and closing control of the grab.

[0018] This device also includes a trolley running driving mechanism 6. The trolley running driving mechanism 6 includes a reduction motor 61 fixed on the trolley frame 15. The reduction motor 61 is a K series reduction motor. The K series reduction motor is also called a helical-bevel gear reducer, which features vertical output, compact structure, large torque transmission with hard tooth surfaces, high-precision gears ensuring smooth operation, low noise, and long service life, with hollow shaft output or solid shaft output. The reduction motor 61 drives the operation of the wheel set 63 through a coupling and a transmission shaft 62, and the synchronism of the two wheel sets is ensured through a mechanical mechanism to increase the positioning accuracy.

[0019] This device also includes four horizontal guide wheels 3. Each horizontal guide wheel 3 is arranged at the end of the trolley frame 15 through a horizontal guide wheel bracket. The horizontal guide wheel bracket and the trolley frame 15 are connected through reamed hole positioning. The axle of each horizontal guide wheel adopts an eccentric shaft structure, and the gap between the horizontal guide wheel and the track can be freely adjusted by rotation, ensuring that the clearance between the bearing wheel of the horizontal guide wheel 3 and the track is 2 - 8 mm, increasing the running accuracy of the trolley, better using automatic control, and meeting the requirements of automatic positioning. A buffer 16 made of polyurethane material is also arranged at the end of the trolley frame outside the horizontal guide wheel bracket, which can effectively protect the safety when the trolley runs to the limit position.

[0020] This device includes a plurality of rigid guide post structures 4, which are evenly and symmetrically distributed. Each guide post structure 4 includes a connecting base 41, an intermediate guide cylinder 42, and a guide post 43. The connecting base 41 above the guide post is welded to the trolley frame. The intermediate guide cylinder 42 is fixed to the connecting base 41 by bolts. The guide post 43 is fixed to the four-rope mechanical grab 5 by bolts. The guide post 43 can be inserted into the intermediate guide cylinder 42 to achieve guiding and positioning. The connecting base 41 and the trolley frame 15 are integrally processed to ensure the verticality and positioning accuracy of the installation. A guide pulley set 44 is also provided on the side of the intermediate guide cylinder 42, which plays a guiding role when the lower guide post 43 enters the interior of the intermediate guide cylinder 42. The design of the rigid guide post structure 4 ensures that the four-rope mechanical grab 5 below does not shake during the operation of the trolley, improves the automatic positioning accuracy, and reduces the waiting time before the next process.

[0021] As Figure 3 shown, this device includes an overload protection mechanism. Overload protection mechanisms are provided at both ends of each drum. The overload protection mechanism includes an overload protector 13, an overload base 14, and a drum clamping base 9. The overload protector 13 is a pressure sensor. The overload base 14 is fixed to the trolley frame 15. The overload protector 13 is bolted to the overload base 14. The drum clamping base 9 is provided at both ends of each drum. The overload protector 13 is also bolted to the drum clamping base 9. In addition, a card slot 17 is provided on the lower bottom surface of the drum clamping base 9, and a protrusion is provided on the upper surface of the overload protector 13, that is, a card slot 17 is provided at the connection part of the drum clamping base 9 and the overload protector 13, and a protrusion is provided at the connection part of the overload protector 13 and the drum clamping base 9. The card slot 17 and the protrusion 18 cooperate with each other. By processing the joint surface of the protrusion and the card slot structure, the positioning accuracy of the connection is ensured. The bearing capacity at both ends of the drum directly acts on the overload protection structure, ensuring that the bearing capacity does not change with the movement of the steel wire rope during the ascending and descending processes, ensuring the safety performance of the lifting, and this clamping plate structure has good applications.

[0022] The device includes a steel wire rope anti-skip mechanism 7 and a guide rod 8. The two drum clamping base plates 9 at both ends of the same drum 12 are connected through the guide rod 8 in the middle. The steel wire rope anti-skip mechanism 7 is sleeved on the drum 12, and the steel wire rope anti-skip mechanism 7 is slidably connected to the guide rod 8. A sliding block is arranged outside the steel wire rope anti-skip mechanism 7, and the sliding block slides along the guide rod 8. The guide rod 8 can not only play the role of connecting and fixing the two drum clamping base plates 9, but also guide the steel wire rope anti-skip mechanism 7. The outer surface of the drum 12 is provided with a spiral steel wire rope winding groove, and the steel wire rope is wound in the steel wire rope winding groove. The inner surface of the steel wire rope anti-skip mechanism 7 is provided with a thread groove, and the steel wire rope anti-skip mechanism 7 is in spiral cooperation with the drum 12, similar to a bolt and nut structure. The drum is analogous to a bolt, and the steel wire rope anti-skip mechanism 7 is analogous to a nut. The driving unit 10 drives the drum to rotate. As the drum 12 rotates, the steel wire rope anti-skip mechanism 7 can translate on the drum 12 under the guiding action of the guide rod 8, and the steel wire rope goes down along the position of the rope outlet. Even at the lower limit position, the steel wire rope can be compacted to prevent the steel wire rope from jumping out of the groove.

[0023] The four-rope grab transfer mechanism disclosed by the present utility model can greatly improve the positioning accuracy of the transfer mechanism, has a relatively high degree of modularization, is equipped with a perfect safety protection mechanism, better adapts to the automated working mode, can effectively prevent the phenomenon of steel wire rope disorder and jumping out of the groove, and can efficiently grab materials.

[0024] The above are only the preferred embodiments of the present utility model. It should be noted that for those skilled in the art, without departing from the overall concept of the present utility model, several changes and improvements can still be made, and these should also be regarded as the protection scope of the present utility model.

Claims

1. A modular four-rope grab automatic transfer mechanism, characterized in that: The invention comprises a lifting unit (1), an opening and closing unit (2), and a four-rope mechanical grab (5) arranged on a trolley frame. The lifting unit (1) and the opening and closing unit (2) each comprise a driving unit (10) and a drum (12). The driving unit (10) of the lifting unit (1) and the opening and closing unit (2) and the drum (12) thereof are spline-connected. Two steel wire ropes (19) are respectively wound around each drum (12), and each steel wire rope (19) is connected to the four-rope mechanical grab (5). It also includes a trolley driving mechanism (6), including a K series reduction motor (61) fixed on the trolley frame (15), the K series reduction motor (61) drives the wheel set (63) to run synchronously through a coupling and a transmission shaft (62); A horizontal guide wheel (3) is arranged at the end of the trolley frame (15) via a horizontal guide wheel bracket, the horizontal guide wheel bracket and the trolley frame (15) are positioned and connected via a reamed hole, and the wheel axle of the horizontal guide wheel adopts an eccentric shaft structure; A rigid guide column structure (4) comprises a connecting base (41), an intermediate guide cylinder (42) and a guide column (43), wherein the connecting base (41) is welded to the trolley frame (15), the intermediate guide cylinder (42) and the connecting base (41) are fixed by bolts, the guide column (43) is fixed to the four-rope mechanical grab (5) by bolts, and the guide column (43) is inserted into the intermediate guide cylinder (42) to achieve guiding positioning; a guide pulley block (44) is also provided on the side of the intermediate guide cylinder (42); The overload protection mechanism comprises an overload protector (13), an overload base (14) and a reel card base (9), wherein the overload protector (13) is a pressure sensor, the overload base (14) is fixed on a trolley frame (15), the overload protector (13) and the overload base (14) are fixed by bolts, the reel card base (9) is sleeved on both ends of the reel (12), the reel (12) is rotatably connected to the reel card base (9) through a bearing, the overload protector (13) and the reel card base (9) are fixed by bolts, and a matching card slot (17) and a protrusion (18) are provided at the connection portion between the reel card base (9) and the overload protector (13); The steel wire rope anti-skipping mechanism (7) and the guide rod (8) are connected between two drum card bases (9) through the guide rod (8); the steel wire rope anti-skipping mechanism (7) is sleeved on the drum (12); the steel wire rope anti-skipping mechanism (7) and the drum (12) are spirally matched; the steel wire rope anti-skipping mechanism (7) and the guide rod (8) are slidably connected; the steel wire rope anti-skipping mechanism (7) can be translated on the drum (12) under the guidance of the guide rod (8).

2. According to claim 1, the modular four-rope grab automatic transfer mechanism is characterized by: A buffer (16) is also provided at the end of the trolley frame (15) outside the horizontal guide wheel bracket.

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